JPH0227541A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To perform recording and reproduction satisfactorily by keeping the direction of the polarizing plane of an electromagnetic radiant flux and that of the orientation of a member consisting of the light modulation member of a rotary recoding disk constant, respectively. CONSTITUTION:A motor M1, a rotary shaft 36, a turntable TT, etc., form a first rotary driving mechanism to drive a disk D rotatably, and also, a motor M2 and a rotary member 40, etc., comprise a second rotary driving mechanism to drive the position of a rotational center rotatably at the same rotating angular velocity as that of the disk D and in a direction opposite to the rotating direction of the disk D setting the position of a laser beam P to be made incident on the disk D as the rotational center (position of rotary shaft 42). And the recording and reproduction of an information signal can be performed by using the disk D comprised by including the member consisting of the light modulation member having optical anisotropy for a crystal axis or the orientation and an electric charge holding layer. Therefore, it is possible to perform the recording and reproduction in a state where relation between the direction PLF of the polarizing plane of the laser beam P, and the direction of the crystal axis or that of the orientation in the member PML consisting of the light modulation member of the disk D is set at constant relation. In such a way, the recording and reproduction can be performed satisfactorily.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a recording/reproducing apparatus, and particularly to a recording/reproducing apparatus capable of recording/reproducing information signals at high recording density.

(Prior Art) As the demand for recording various information signals at high recording densities has increased, in recent years it has become possible to record information signals using recording media made based on various structural and operating principles. It is well known that high-density recording/reproduction has come to be performed.

In order to meet the demands for high-density recording and reproduction in various technical fields, information is transferred to the recording layer of the recording medium by irradiating the #1 layer of the recording medium with a recording beam whose intensity is modulated by an information signal. Research has also begun on recording media in which information signals can be recorded by causing physical or chemical changes in response to the signal.

Furthermore, in recent years, semiconductor lasers that operate stably have become easily available, and various optical discs that use laser light to perform high-density recording and playback have already been put into practical use. It is well known that research and development for practical application is currently underway.

In other words, recorded optical discs (playback-only optical discs) that have been copied in large numbers from master discs on which information signals are recorded using bits formed as geometrical concave or convex parts are, for example, video discs, compact discs, etc. In addition, optical discs that can be added and recorded only once by the user (write-once optical discs) and erasable optical discs are being put into practical use for office file memory and other uses. A lot of research and development is being carried out for this purpose, and so far there have been various types of write-once optical discs and erasable optical discs: bit-forming type, crinkle or unevenness-forming type, magneto-optical type, five-phase change type (optical type that uses thermal energy to A variety of types have been proposed, such as a thermally variable type that causes changes in transmittance, reflectance, absorption rate, etc. Many proposals have been made regarding recording media for recording.

By the way, in the conventional recording and reproducing apparatuses using the various types of recording media described above, the configuration of the apparatus for performing high-density recording is complicated and large-scale, and erasable recording media are also used as described above. For example, in the case of a magnetic recording medium, erasing is easy, but on the other hand, there is a problem in terms of high-density recording, and in the case of an optical disk, for example, high-density recording However, there is a problem in that it cannot be erased by simple means.

Therefore, the applicant company first uses a laser beam to record information on a recording medium that includes a member made of a light modulating material that has optical anisotropy in the crystal axis or orientation, and a charge retention layer. 15. A charge pattern corresponding to a target information signal is formed, and the charge pattern is read on a recording medium using a laser beam.
We have proposed a recording/reproducing apparatus as illustrated in FIGS.

In FIGS. 15 and 16, Dl is a recording medium,
The recording medium DI shown in each figure is.

7. A transparent electrode Etl, a photoconductive layer member PCL, a dielectric mirror DML, and a member made of a light modulating material having optical anisotropy in the crystal axis or orientation, that is, a light modulating material layer member PML (for example, niobium). The general structure is that it has a laminated structure with a transparent electrode Et2 (a material such as an electro-optic crystal such as lithium oxide single crystal, bismuth silicate (BSO), or a liquid crystal is used), and a transparent electrode Et2. It is shown.

The specific cross-sectional structure of the recording member D1 in the case where the light modulating material layer member PML used as a constituent member is a liquid crystal is shown in the ninth section.
The specific details of the recording member D1 shown in the figure and in the case where the light modulating material layer member PML used as a constituent member is an electro-optic crystal such as lithium niobate single crystal or bismuth silicate (BSo) The cross-sectional structure is shown in FIG. 10, in which 25, 26 and 33 are glass substrates, 27 and 35 are transparent electrodes, 28 and 31 are alignment films,
29.30 is a spacer, 32 is a dielectric mirror, 34 is a charge retention layer, PML is a liquid crystal, PCL is a photoconductive layer, and in FIG. 10, 25.26 is a glass substrate, 27.3
5 is a transparent electrode, 32 is a dielectric mirror, 34 is a charge retention layer, PML is an electro-optic crystal such as lithium niobate single crystal or bismuth silicate (BSo), and PCL is a photoconductive layer.

The recording medium D1 has (1) transparent electrodes Et on both sides thereof.
When a writing light whose intensity is modulated by an information signal is incident on the transparent electrode Etl side while a constant voltage is applied between L and EtZ, the portion of the photoconductive layer where the writing light is incident The electrical resistance value of the member PCL changes according to the intensity of the above-mentioned writing light, and the above-mentioned writing light is applied to the boundary with the dielectric mirror DML in the portion of the photoconductive layer member PCL where the electrical resistance value has changed as described above. (In the specific structural diagrams shown in FIGS. 9 and 10, charges are accumulated in the charge retention layer 34...Similar (The same applies to other parts described), and (2) the recording medium DI is in a state where writing light of a constant light intensity is incident on the transparent electrode Etl side thereof, When the voltage applied between the transparent electrodes Etl and EtZ of the screen is changed, the dielectric mirror DML at the portion where the writing light is incident and the electrical resistance value of the photoconductive layer member PCL changes.
An amount of charge corresponding to the voltage value applied between the transparent electrodes Etl and EtZ is accumulated at the boundary between the transparent electrodes Etl and EtZ.

Therefore, the recording medium DI having the above configuration is
In the above-mentioned state (1), the intensity of the writing light is modulated by the information signal, or in the above-mentioned state (2), the transparent electrode Etl.

By intensity modulating the voltage across EtZ with an information signal, an amount corresponding to the above-mentioned information signal is generated at the boundary with the dielectric mirror DML at the part where light is incident and the electrical resistance value of the light guide ft1 member PCL changes. charge can be accumulated.

Then, with the above-mentioned recording medium DI in a moving state, the above-mentioned writing light is made to enter the photoconductive layer member PCL through the transparent electrode Etl using an extremely small diameter light, as described above (1). Alternatively, if an information signal is recorded using either method (2), the light is incident on the light guide M.
A pattern of charges having an amount corresponding to the above-described information signal accumulated at the boundary with the dielectric mirror DML in the portion where the electrical resistance value of the layer member PCL has changed can have extremely high resolution.

As described above, the charge image accumulated at the boundary between the photoconductive layer member PCL and the dielectric mirror DML, that is,
A charge image whose charge amount changes according to the information signal to be recorded is formed by the transparent electrodes Etl and EtZ described above.
An optical image can be reproduced by short-circuiting the two electrodes and allowing light to enter from the transparent electrode Et2 side.

That is, after short-circuiting the transparent electrodes Etl and EtZ, the transparent electrode E on the recording medium D1 is
When the readout light is incident from the tZ side, the readout light passes through the light modulation material layer member PML such as electro-optic crystal or liquid crystal, is reflected by the dielectric mirror DML, and then passes through the light modulation material layer member PML again. Transparent 1!1iEt2 after passing
Although the light is emitted from the side, the optical properties of the light modulating material member PML such as the electro-optic crystal or liquid crystal change according to the electric field applied to it, so the light is emitted from the transparent electrode Et2 as described above. The state of the emitted light is changing according to the charge image accumulated at the boundary between the photoconductive layer member PCL and the dielectric mirror DML.

Therefore, the dielectric mirror D in the photoconductive layer member PCL
By converting the change in the state of the light emitted from the transparent electrode Et2, which changes the state of light according to the charge image accumulated at the boundary with the ML, into the intensity of the light, it can be recognized as a light image. Furthermore, it can be converted into an electric signal by photoelectrically converting it, and it can also be converted into a video signal by photoelectrically converting the light emitted from the transparent electrode Et2 obtained by scanning the flying spots with the readout light. If a readout beam with an extremely small diameter is used, it is possible to generate a video signal capable of reproducing a high resolution reproduction image. Making the light spot of the writing light or the reading light very small can be easily achieved by using a laser beam.

Further, as described above, the charges accumulated at the boundary between the photoconductive layer member PCL and the dielectric mirror DML are transferred to the transparent electrode E.
After short-circuiting between tl and EtZ, light of a certain intensity is incident from the transparent electrode Etl side to the photoconductive layer member P.
It can be erased by lowering the electrical resistance value of CL.

In FIG. 15, the components shown on the right side of the recording medium D1 constitute the recording system and the erasing system, and the components shown on the left side of the recording medium D1 constitute the reproduction system. This is the first component.
In Figure 5, 1 and 2 are laser light sources, 3 to 7 are lenses, and 8
, 9 is a polarizer, 10 is luminous intensity III! , 11.12 is a wave plate, 13 and 14 are analyzers, 15 is a beam splitter, 1
6 is a light quantity converter, 17 is an amplifier, and 18 is an output terminal.

Further, 19.20 is a changeover switch, 21 is a signal source (signal g) of an information signal to be recorded, and 22 is a recording medium D.
This is a power supply that applies a predetermined voltage between the transparent electrodes Etl and EtZ of 1.

The aforementioned changeover switches 19 and 20 switch their movable contact V to the fixed contact when the recording/reproducing apparatus is placed in the write mode. Also.

The movable contact V of the changeover switch 20 described above is switched to the fixed contact side even when the recording/reproducing apparatus is placed in the erase mode.

The operation of the recording/reproducing apparatus shown in FIG. 15 when it is in the write mode will be explained as follows. That is, when the recording/reproducing apparatus is put into the recording mode, the recording medium D1 is driven and rotated at a predetermined number of rotations, and the constituent parts of the recording system are rotated.

The recording medium D1 is transported in the radial direction at a predetermined transport speed by a transport mechanism (not shown), and the changeover switch 1
9. The movable contact a of 20 is switched to the fixed contact a side, whereby a predetermined voltage is applied from the power supply 22 between the transparent electrodes Etl and EtZ of the recording medium D1, and the signal source of the information signal to be recorded is applied. An information signal from 21 is supplied to optical modulator 10 . Further, the laser light source 2 in the reproduction system is rendered inactive.

The laser light emitted from the laser light source 1 is converted into parallel light by the lens 3, and then converted into linearly polarized light having a specific plane of polarization by the polarizer 8, and is incident on the optical modulator 10. The light is modulated by the information signal supplied from the information signal source 21.

The laser beam emitted from the optical modulator 10 passes through a wavelength plate 11 for optically setting a bias, and then enters an analyzer 13, and from the analyzer 13, a laser beam whose intensity has been modulated by an information signal is output. A laser beam is emitted. The laser beam emitted from the analyzer 13 is focused by the lens 4, passes through the transparent electrode Etl of the recording medium D1, and enters the photoconductive layer member PCL.

The electrical resistance value of the laser beam incident part of the photoconductive layer member PCL changes according to the light intensity of the laser beam, and the boundary with the dielectric mirror DML in that part has a charge corresponding to the information signal described above. A certain amount of charge is accumulated, and the information signal to be recorded is recorded as a charge image.

Next, when the recording and reproducing apparatus shown in FIG. 15 is put into the reproducing mode, the laser light source 1 of the recording system is made inactive, and the movable contact V of the changeover switch 20 is switched to the fixed contact side. It will be done.

A reading laser beam emitted from a reproduction laser light source 2 is made into parallel light by a lens 6, and then enters a polarizer 9, which emits linearly polarized light having a specific polarization plane. The laser beam emitted from the polarizer 9 described above passes through the beam splitter 15, is focused by the lens 5, and enters the transparent electrode Et2 on the recording medium D1.

As described above, the reading laser beam incident on the transparent electrode Et2 in the recording medium D1 passes through the light modulating material layer member PML such as an electro-optic crystal or liquid crystal, and then is reflected by the dielectric mirror DML and becomes light again. The light passes through the modulating material layer member PML and is emitted from the transparent electrode Et2 side.

Since the optical properties of the light modulating material layer member PML such as the electro-optic crystal or liquid crystal change according to the electric field applied thereto, the transparent electrode Et
The plane of polarization of the light emitted from the light source 2 changes according to the charge image accumulated at the boundary between the photo-conductive layer member PCL and the dielectric mirror DML during the recording operation described above.

The light emitted from the transparent electrode Et2 of the recording medium D1 is reflected by the beam splitter 15 and enters the wavelength plate 12. This wave length plate 12 is used to optically set the bias. The laser beam emitted from the wavelength plate 12 - East is a laser beam whose polarization plane is changed into a bright and dark state by an analyzer 14, and then enters a photoelectric converter 16, where the laser beam incident on it is changed into a bright and dark state. It outputs an electrical signal according to the change in intensity, which is amplified by the amplifier 17 and output to the output terminal 18.

Next, the operation of erasing recorded information in the recording/reproducing apparatus shown in FIG. 15 will be explained. When the recording and reproducing apparatus is put into the erasing operation mode, the reproducing laser light source 2 is rendered inactive, the movable contacts V of the changeover switches 19 and 20 are switched to the fixed contact side, and the recording laser light source 2 is switched to the fixed contact side. 111X1 is activated.

In the above state, the laser light emitted from the laser light source 1 is made into parallel light by the lens 3, and then converted into linearly polarized light having a specific plane of polarization by the polarizer 8, and then sent to the optical modulator 1.
o→Wave plate 11→Analyzer 13→A laser beam having a constant light intensity is emitted from the analyzer 13, and the laser beam is condensed by a lens 4 to a transparent electrode of the recording medium D1. It is input to Etl.

The laser beam incident on the transparent electrode Etl of the recording medium D1 passes through the transparent electrode Etl and enters the photoconductive layer member PCL. This is because the electrical resistance value of the laser beam incident portion of the light guide 11M member PCL changes to a constant low resistance value depending on a constant amount of laser beam.

The charge accumulated at the boundary with the dielectric mirror DML is removed by the circuit of photoconductive layer member PCL→transparent electrode Etl→fixed contact b of switch 20→movable contact V→ground, and an erasing operation is performed.

By the way, in the case where the recording medium Di is a recording medium that has already been recorded, erasing must be performed prior to the recording operation using new recorded information.
The laser light source for recording (writing) and the laser light source for erasing are the same laser light source 1, and the laser light source 1
If the optical path of the laser beam emitted from the is the same in recording mode (writing mode) and erasing mode, the preceding erasing operation and writing operation performed before writing new information are performed in a time-sharing manner. All you have to do is make it happen.

Next, the recording medium D1 used for recording and reproducing information signals in the recording and reproducing apparatus shown in FIG. The recording medium DI was configured so that writing of the information signal and reading of the information signal were performed from opposite sides of the recording medium DI.
The recording/reproducing apparatus having the configuration example shown in FIG. 16 is a recording medium D1 used for recording/reproducing information signals, and has a configuration in which writing of information signals and reading of information signals can be performed from the same side of the recording medium. those of, ie.

A transparent electrode Et, a photoconductive layer member PCL, a dielectric mirror DMLr having wavelength selectivity that allows writing light and erasing light to pass through and reflects readout light, and a lithium niobate single crystal, for example. A light modulating material layer member PML such as an electro-optic crystal or a liquid crystal.

A configuration example in which a recording medium Di having a laminated structure with an ffi pole E is used is shown.

In Fig. 16, 1 and 2 are laser light sources, 3 and 4°6.7
is a lens, 8 is a polarizer, 10 is an optical modulator, 12 is a wavelength plate, 13.14 is an analyzer, 23.24 is a beam splitter, 16 is a photoelectric converter, 17 is an amplifier, and 18 is an output terminal. , 19.20 is a changeover switch, 21 is a signal source of an information signal to be recorded (signal WX), and 22 is a power supply that applies a predetermined voltage between the transparent electrode Et and the electrode E of the recording medium D1. It is.

The aforementioned changeover switches 19 and 20 switch the movable contact V to the fixed contact a side when the recording/reproducing device is in the write mode, and switch the movable contact V to the fixed contact a side when the recording/reproducing device is in the playback mode. The movable contact V is switched to the fixed contact side. Further, the movable contact V of the changeover switch 20 described above also operates when the recording/reproducing apparatus is set to the erase mode.
Its movable contact V is switched to the fixed contact side.

The operation of the recording/reproducing apparatus shown in FIG. 16 in the write mode will be explained as follows. That is, when the recording/reproducing apparatus is put into the recording mode, the recording medium D1 is driven to rotate at a predetermined number of rotations, and the components of the recording system, reproduction system, and erasing system are moved by a transport mechanism (not shown). The recording medium D1 is transferred in the radial direction at a predetermined transfer speed, and the movable contact a of the changeover switch 19.20 is switched to the fixed contact a side, whereby the gap between the transparent electrode Et and the electrode E of the recording medium D1 is A predetermined voltage is applied from a power supply 22 to the optical modulator 10, and an information signal from a signal source 21 of an information signal to be recorded is supplied to the optical modulator 10. Further, the laser light source 2 in the reproduction system is rendered inactive.

The laser light emitted from the laser light source 1 is made into parallel light by the lens 3, and then made into linearly polarized light having a specific plane of polarization by the polarizer 8, which is incident on the optical modulator 10, where the information signal to be recorded is converted into a linearly polarized light by the polarizer 8. The light is optically modulated by an information signal supplied from a signal source 21.

The laser beam emitted from the optical modulator 10 described above is optically biased by a wave plate (not shown) as necessary, and then enters the analyzer 13.
3 emits a laser beam whose intensity is modulated by an information signal. The laser beam emitted from the analyzer 13 is incident on the lens 4 via the beam splitter 23, 24, and is focused by the lens 4 to connect the transparent electrode Et of the recording medium D1, the light modulating material member PML, and the dielectric having wavelength selection characteristics. The photoconductive layer member PCL passes through the body mirror DMLr.
(The laser beam emitted from lens 4 is incident on the first
(Illustrated by the dotted line in Figure 6).

As a result, the electrical resistance value of the part of the photoconductive layer member PCL where the laser beam is incident changes in accordance with the light intensity of the laser beam, and the boundary with the dielectric mirror DMLr in that part has a charge corresponding to the information signal described above. A certain amount of charge is accumulated, and the information signal to be recorded is recorded as a charge image.

Next, when the recording and reproducing apparatus shown in FIG. The movable contact V is switched to the fixed contact side.

The readout laser light (readout light) emitted from the playback laser light source 2 is made into parallel light by the lens 6, then enters the lens 5 via the beam splitter 23, 24, and is condensed by the lens 5. The light is incident on the transparent electrode Et on the recording medium Di.

As described above, the reading laser beam incident on the transparent electrode Et in the recording medium D1 passes through the light modulating material layer member PML such as an electro-optic crystal or liquid crystal, is reflected by the dielectric mirror DMLr, and becomes light again. The light passes through the modulating material layer member PML and is emitted from the transparent electrode Et side (see the solid line in FIG. 16).

Since the optical properties of the light modulating material layer member PML such as the electro-optic crystal or liquid crystal change according to the electric field applied thereto, the transparent electrode Et
The light emitted from the photoconductive layer member PCL has its polarization plane changed according to the charge image accumulated at the boundary with the dielectric mirror DMLr in the photoconductive layer member PCL during the recording operation described above.

The light emitted from the transparent electrode Et of the recording medium D1 passes through the lens 5.
The light passes through the beam splitter 24 and enters the wave plate 12. This wave plate 12 is used to optically set a bias. The laser beam emitted from the wavelength plate 12 enters the photoelectric converter 16 after the polarization plane of the laser beam is changed into a bright and dark state by the analyzer 14, and the photoelectric converter 16 detects the intensity of the laser beam incident thereon. An electrical signal according to the change is output, which is amplified by an amplifier 17 and then output to an output terminal 18.

Next, the operation of erasing recorded information in the recording/reproducing apparatus shown in FIG. 16 will be explained. When the recording and reproducing apparatus is put into the erasing operation mode, the reproducing laser beam wX2 is put into an inactive state, the movable contact V of the changeover switch 19, 20 is switched to the fixed contact side, and the recording laser light source is switched to the fixed contact side. 1 is activated.

In the above state, the laser light emitted from the laser light source 1 is made into parallel light by the lens 3, and then made into linearly polarized light having a specific plane of polarization by the polarizer 8. A laser beam having a constant light intensity is emitted from the analyzer 13 after passing through the optical path of the splitter 23→beam splitter 24→, and is focused by the lens 4, and is incident on the transparent electrode Et of the recording medium D1.

The erasing laser beam incident on the transparent electrode Et of the recording medium D1 passes through the transparent electrode Et and the light modulating material layer member PML such as an electro-optic crystal or liquid crystal, is reflected by the dielectric mirror DMLr, and is emitted again. The light passes through the light modulating material layer member PML and is emitted from the transparent electrode Et side. (The laser beam emitted from the lens 4 is illustrated by the dotted line in FIG. 16).

This is because the electrical resistance value of the photoconductive layer member PCL at the part where the laser beam for erasing is incident changes to a constant low resistance value by a constant amount of laser beam.

The charges accumulated at the boundary with the dielectric mirror DMLr are removed by the circuit of photoconductive layer member PCL→transparent electrode Et→fixed contact b of switch 20→movable contact→ground, and an erasing operation is performed.

By the way, if the recording medium D1 is a recording medium that has already been recorded, it must be erased before the recording operation using new recorded information. When the laser light source and the erasing laser light source are the same laser light source 1, and the optical path of the laser beam emitted from the laser light source 1 is the same in the recording mode (writing mode) and the erasing mode, In this case, the advance erasing operation and the writing operation performed prior to writing new information may be performed in a time-sharing manner as in the case of the recording/reproducing apparatus having the configuration shown in FIG.

(Problems to be Solved by the Invention) The previously proposed recording and reproducing apparatus described with reference to FIGS. 15 and 16 uses a laser beam to record information on the recording medium Di. This is a recording and reproducing apparatus that forms a charge pattern corresponding to a signal and reads the charge pattern on a rotating recording medium disk using a laser beam. A recording medium used in a recording/reproducing device is capable of realizing recording and reproducing operations of information signals at a higher recording density, and also has the characteristics of being able to easily erase recorded contents. Since the recording medium is configured as a rotating recording medium disk, the recording medium is configured as a rotating recording medium disk. If so, the direction of the polarization plane of the laser beam for recording and reproduction.

The relationship between the direction of the crystal axis and the direction of orientation in a member made of a light modulating material having optical anisotropy in the crystal axis or orientation, which is used as a part of the constituent members of the rotating recording medium disk, is Due to the rotation of the medium disk, changes as shown in FIG. 14 may occur, making it impossible to perform recording and reproduction properly.

The above points will be explained with reference to FIG. 14 as follows. In FIG. 14, D is a rotating recording medium disk, LS is a laser light source, and FIG.
A state in which laser light PQ emitted from the laser beam PQ is projected is shown.

The rotating recording medium disk shown in FIG. 14 uses a light modulating material having optical anisotropy in the crystal axis or orientation as one of its constituent members. Assuming that the direction of the crystal axis and the direction of orientation are as shown by the arrow X in FIG. 14, the rotating recording medium disk changes from the state of (a) in FIG. Assuming that the state is rotated in the direction of arrow R to the state shown in FIG.
Polarized light 1 of the laser light emitted from the laser light source LS when the rotating recording medium-disc rotates in the direction of arrow R from the state of FIG. 14(a) to the state of FIG. 14(b)
The direction of the arrow PLF in Figure 14, which shows the direction of The relationship with arrow X is as shown in (a) and (b) in Figure 14.
), it is clear that the two figures are different from each other.

Then, an information signal is recorded using a laser beam on a recording medium that is constructed using a light modulating material that has optical anisotropy in the crystal axis or orientation as a part of its constituent members, or an information signal is recorded on a recorded recording medium. In recording and reproducing operations when reproducing information signals by projecting a laser beam onto a light source, the direction of the polarization plane of the laser beam and the direction of the crystal axis or orientation of the light modulating material are in a specific relationship. What is necessary is the 15th
It can be understood from the explanation regarding the previously proposed recording and reproducing apparatus shown in FIG. The relationship between the direction of the crystal axis and the direction of orientation in a member made of a light modulating material that has optical anisotropy in the crystal axis or orientation used in the recording medium changes with the rotation of the rotating recording medium disk, and recording A solution was sought to solve the problem that regeneration could not be performed properly.

(Means for Solving the Problems) The present invention provides a rotating recording medium disk comprising a member made of a light modulating material having optical anisotropy in the crystal axis or orientation, and a charge retention layer. A recording/reproducing device that uses a laser beam to form a charge pattern corresponding to an information signal to be recorded, and also uses a laser beam to read the charge pattern on a rotating recording medium disc. a first rotational drive mechanism that drives and rotates a rotating recording medium disk at a predetermined angular velocity; a second rotary drive mechanism that drives and rotates the position of the center of rotation of the disc-shaped rotary recording medium at the same rotational angular velocity as the rotary recording medium and in a direction opposite to the rotation direction of the disk; A recording/reproducing device capable of maintaining a substantially constant relationship between the polarization plane of the laser beam and the direction of the crystal axis or orientation of the member made of the light modulating material of the rotating recording medium disk;
Information that is recorded using a laser beam on a rotating recording medium disc that includes a member made of a light modulating material that has optical anisotropy in its crystal axis or orientation, and a charge retention layer. Forms a charge pattern corresponding to the signal,
Further, in a recording and reproducing apparatus that uses a laser beam to read a charge pattern on a rotating recording medium disk, the orientation of a member made of a light modulating material used as a component of the one-rotating recording medium disk is also disclosed. The member made of the light modulating material is arranged so that the direction is the circumferential direction or the radial direction of the rotating recording medium disk, and the polarization plane of the laser beam and the orientation in the member made of the light modulating material of the rotating recording medium disk are arranged. A recording/reproducing device capable of maintaining a substantially constant relationship with the direction of the light beam, and a member made of a light modulating material having optical anisotropy in the direction of crystal axis or orientation, and a charge retention layer. It consists of a rotating recording medium disk.

A recording/reproducing device that uses a laser beam to form a charge pattern corresponding to an information signal to be recorded, and also uses the laser beam to read the charge pattern on a rotating recording medium disk. In this case, the crystal axes and orientation directions of the members made of the light modulating material used as constituent members of the rotating recording medium disk are substantially the same predetermined direction with respect to the radial direction of the rotating recording medium disk. A plurality of recording/reproducing areas are provided on a rotating recording medium disk, and the polarization plane of the laser beam and the direction of the crystal axis or orientation of the member made of the light modulating material of the plurality of recording/reproducing areas on the rotating recording medium disk are determined. A recording/reproducing device capable of maintaining a substantially constant relationship between

Furthermore, a rotating recording medium disk comprising a member made of a light modulating material having optical anisotropy in the crystal axis or orientation and a charge retention layer is recorded using a laser beam. A recording/reproducing device that forms a charge pattern corresponding to an information signal and reads the charge pattern on a rotating recording medium disk using a laser beam, the device forming a charge pattern corresponding to an information signal, and reading the charge pattern on a rotating recording medium disk using a laser beam. By rotating the polarization plane of the laser beam, it is possible to maintain a substantially constant relationship between the polarization plane of the laser beam and the direction of the crystal axis or orientation of the member made of the light modulating material of the rotating recording medium disk. The present invention provides a recording and reproducing device that has the following features.

(Example) Hereinafter, specific contents of the recording/reproducing apparatus of the present invention will be explained in detail with reference to the accompanying drawings. FIG. 1 is a side view showing a schematic configuration of the main parts of the recording and reproducing apparatus of the present invention, and FIGS. 2 to 5 are the structural principles and operating principles of the recording and reproducing apparatus of the present invention shown in FIG. FIGS. 6 to 8 and 11, as well as FIGS. 17 and 18, are block diagrams of parts of embodiments of other containers of the recording/reproducing apparatus of the present invention. 12 and 13 are diagrams for explaining the configuration principle and operating principle of the recording/reproducing apparatus of the present invention shown in FIG. 11.

In FIG. 1, D is a rotating recording medium disk that includes a member made of a light modulating material having optical anisotropy in the crystal axis or orientation, and a charge retention layer. D (hereinafter)

(sometimes written as disk D) is motor M
It is fixed to the turntable TT by a clamper 37 so as to be able to rotate integrally with the turntable TT fixed to the rotation shaft 36 of the rotor 1. In FIG. 1, the turntable TT is shown as having the same size as the disk D, but in actual practice, the turntable TT is made to have a diameter that is much smaller than the diameter of the disk D. You can.

The motor M1 described above drives and rotates the disk D at a predetermined rotational speed and rotational phase under automatic control by an automatic rotational control system (not shown). Further, the motor M1 is fixed on a transfer table 38 having a screw hole into which a feed screw 39 connected to the output rotating shaft of the motor M3 is screwed.

Since the transfer table 38 is engaged with a rail (not shown) provided on a rotating member 40 driven and rotated by the motor M2, the motor M3 is intermittently moved in a predetermined manner. According to the rotation of the feed screw 39 caused by the target or continuous rotation, the transfer table 38 is moved intermittently or continuously in the direction of arrow U in FIG. 1 along the rail provided on the rotating member 40. Ru.

The rotating member 40 described above is fixed to the rotation shaft 42 of the motor M2, and is configured to rotate at the same rotation speed as the rotation speed of the motor M1, and in a rotation direction opposite to the rotation direction of the motor M1. It is driven and rotated by the aforementioned motor M2. 43 indicates a fixed part of the body to which the motor M2 is fixed.

41 is a weight for dynamically balancing the rotating member 40 that is driven and rotated around the rotating shaft 42 of the motor M2 and the portion that is driven and rotated integrally with the rotating member 40; 9 Dynamic balance of the rotating member 40; In order to achieve this, it is necessary to change the position of the weight 41 in accordance with the position of the transfer table 38 on the rotating member 40, but in FIG. The structure for displacing the weight 41 in accordance with the weight 41 is not shown in the drawings, but the displacement mechanism for the weight 41 has the same configuration as the displacement mechanism for the motor M2 using the motor M3 and the transfer table 38. This can be achieved by

In the recording/reproducing apparatus shown in the first diagram described above, the motor M1
The components such as the rotating shaft 35 and the turntable TT are as follows.
It forms a first rotational drive mechanism that drives and rotates the disk D at a predetermined angular velocity, and the motor M2, the rotating member 40, and other constituent parts are connected to the laser beam PI! which is made incident on the disk D! The position of rotation center (rotation axis 4
2's digit, which is the same as the rotational angular velocity of disk D described above.

In addition, a second rotational drive mechanism is configured to drive and rotate the center of rotation of the disk D in a direction opposite to the rotational direction of the disk D.

Then, a first rotational drive mechanism as shown in the first diagram, and a second rotational drive mechanism are provided.
By configuring a recording and reproducing device using a rotational drive mechanism of When an information signal is recorded and reproduced using
Recording and reproducing operations can be performed in a state where the direction of the crystal axis and the direction of orientation in the member PML made of the light modulating material of the disk D are maintained in a substantially constant relationship.

That is, the disk D, which includes a member made of a light modulating material having optical anisotropy in the crystal axis or orientation, and a charge retention layer, is rotated by the first rotation drive 4! In other words, the disk D is rotationally driven only by the conventional disk drive mechanism.
The location of the problem when the is rotationally driven is the 14th
As already mentioned with reference to the figure, the fourteenth
In FIG. 5, which illustrates and explains the location of the problem more clearly than in the figure, the light modulating material used in the structure of the disk D has a crystal axis direction and an orientation direction of the disk D.
The laser light pn emitted from the laser light source LS to the disk D, which is used as shown by the arrow X in FIG.
In the case that the direction is indicated by arrow PLF in the figure, the disk D is rotated by 90 degrees in the direction of arrow R from the state of (a) in FIG. When D is rotated by 90 degrees in the direction of arrow R from the state of (b) in FIG. 5 to the state of (Q) in FIG. 5, which is the state of FIG. Although the direction of the polarization plane of the laser beam PQ emitted from the disk is always constant as shown in the direction of the arrow PLF in FIG. -X direction) changes with the rotation of the disk D as shown in (a) to (Q) in FIG. The relative relationship between the direction (the direction of the arrow X) and the direction of the polarization plane of the laser light Pn emitted from the laser light source LS (the direction of the arrow PLF) changes as the disk D rotates.

The alphabet A shown in FIG. The information is described and displayed to make it easy to understand how the direction of the crystal axis and the orientation direction of the light modulating material change relative to the direction PLF of the polarization plane of the laser beam PQ due to the rotation of the disk D. This is what I did.

On the other hand, the recording and reproducing apparatus of the embodiment shown in FIG.
As described above, the first rotary drive mechanism drives and rotates the disk D, which is composed of components such as the motor M1, the rotating shaft 35, and the turntable TT, at a predetermined angular velocity, and the laser beam is incident on the disk D. The position of PQ is the center of rotation (center position I of the rotating shaft 42), and the position of the center of rotation of the disk D is the same as the rotational angular velocity of the disk D and is opposite to the direction of rotation of the disk D. Since the disk D is rotationally driven by a second rotational drive mechanism consisting of a motor M2 and a rotating member 40, etc., the portion on which the laser beam PΩ is projected is The direction of the crystal axis or the orientation direction
figure.

Furthermore, as can be seen from FIGS. 4(a) to 4(c), recording and reproducing operations can be performed while maintaining a substantially constant relationship.

In the embodiment of the present invention shown in FIG. 1, when recording marks are sequentially formed at a predetermined interval (track pitch) in the radial direction on the disc D, the irradiation position of the laser beam is set on the disc D. The embodiment of the present invention shown in FIG. In the example device, the irradiation position of the laser beam PQ on the disk D mentioned above.

Since the center of rotation in the second rotational drive mechanism (the center of the rotational shaft 42 of the motor M2) must always match, the rotational center of the second rotational drive mechanism (the center of the rotational shaft 42 of the motor M2) must always be aligned with the rotational center of the second rotational drive mechanism. The transfer table 38, which is engaged with the rail (not shown), is rotated by the rotation of the feed screw 39 by the intermittent or continuous rotation of the motor M3 in a predetermined manner. By moving the laser beam pH intermittently or continuously in the
The center of 2) is brought into a state where they are aligned.

Next, FIGS. 6 and 7 show a disk D that is used as a constituent member of a disk D that includes a member made of a light modulating material having optical anisotropy in orientation and a charge retention layer. The orientation direction of the member made of the light modulating material is
A member made of a light modulating material is arranged over the entire disk D so as to be in the circumferential direction or radial direction of the disk D, and the direction of orientation of the polarization plane of the laser beam and the member made of the light modulating material of the disk D is determined. 1 is a diagram illustrating a schematic configuration of a recording/reproducing apparatus according to the present invention in which recording and reproducing are performed using a device that can maintain a substantially constant relationship.

First, FIG. 6 shows a member made of a light modulating material (for example, liquid crystal) having optical anisotropy in orientation, which is used as one of the constituent members of the disk D. Recording and reproduction are performed using a disk D configured such that the entire surface is oriented in the radial direction of the disk D. This is an embodiment in which the direction X can be maintained in a substantially constant relationship.

In FIG. 6, the plurality of lines shown in the radial direction of the disk D indicates that the orientation direction X of the member made of the light modulating material of the disk D coincides with the radial direction of the disk D. belongs to.

Next, FIG. 7 shows a member made of a light modulating material (liquid crystal) having optical anisotropy in orientation, which is used as one of the constituent members of the disc D, and shows that the orientation direction of the member is an optically anisotropic light modulating material (liquid crystal) that is used as one of the constituent members of the disc D. Recording and reproduction are performed using a disk D configured such that the entire area is aligned in the circumferential direction of the disk D. This is an embodiment in which the direction X can be maintained in a substantially constant relationship, and in FIG. This indicates that the direction X of the orientation coincides with the circumferential direction of the disk D.

FIG. 8 also shows a member made of a light modulating material having optical anisotropy in its crystal axis or orientation, which is used as one of the constituent members of the disk D. A plurality of recording/reproducing areas Zl, Z2, .

In order to maintain a substantially constant relationship between the direction PLF of the polarization plane of the second laser beam and the crystal axis direction and orientation direction X of the light modulating material in each recording/reproducing area Zl, Z2... This is an example in which

Furthermore, by rotating the polarization plane of the laser beam corresponding to the rotation of the disk D, the direction of the polarization plane of the laser beam and the direction of the crystal axis and orientation of the member made of the light modulating material of the disk D are shown. FIG.
In Figure 1, LSI and LS2 are laser light sources that emit linearly polarized laser light, and PMODI
~PMOD4 is a light modulator, PD is a photodetector, 48°49
50 is a polarizer, 50 is a rotating polarizer, and 44 to 47 are input terminals for modulating signals to each of the optical modulators PMODI to PMOD4.

In the recording and reproducing apparatus shown in FIG.
The first signal is intensity-modulated by a signal as shown in FIG.
Laser light PΩlb exhibiting intensity changes on the time axis as shown in FIG. 3(A) is incident on the optical modulator PMOD4.

The phase of the laser beam PΩlb· incident on the optical modulator PMOD4 is shifted by π during the period when the signal of the half-wave voltage Vπ shown in FIG. 13(D) is supplied to the input terminal 47 of the optical modulator PMOD4. Output.

Further, the linearly polarized laser light PQ2m emitted from the laser light source LS2 is supplied to the input terminal 45 of the optical modulator PMOD2 by the optical modulator PMOD2 and the polarizer 49, as shown in FIG. 13(B). Laser light Pu2b is intensity-modulated by a signal such as that shown in FIG. 13, and shows intensity changes on the time axis as shown in FIG. 13(B).

The laser beam PQ2b incident on the optical modulator PMOD3 has a phase of π during the period when the signal of the half-wave voltage Vπ shown in FIG. 13(C) is supplied to the input terminal 46 of the optical modulator PMOD3.
The output is shifted by

The laser light PAL emitted from the optical modulator PMODA described above and the laser light Pu2 emitted from the optical modulator PMOD3 are combined by a beam splitter Pb52, and then transmitted through the beam splitter Pb52 to the disk D. However, the plane of polarization of the laser beam incident on the disk D rotates in synchronization with the rotation of the disk D. Therefore, the plane of polarization of the laser beam incident on the disk D that rotates once is the same as that of the disk D. It can be rotated in synchronization with the rotation of D.

The states of light shown on the left side of FIG. 12 (a) to (f) are shown on the horizontal axis in FIG. 13 at the respective points in time shown as (a) to (f). state,
The polarization plane of the laser beam irradiated onto the disk D is oriented along the time axis in synchronization with the rotation of the disk D, as shown in the vectors shown on the right side of FIG. 12 (a) to (f), respectively. In the embodiment shown in Figure 11, by rotating the polarization plane of the laser beam in synchronization with the rotation of the disk, the direction of the polarization plane of the laser beam and the disk can be changed. The direction of the crystal axis and the direction of orientation X of the light modulating material D can be maintained in a constant relationship.

Therefore, assuming that the laser beam projected from the beam splitter Pb52 onto the disk D is intensity-modulated by the information signal to be recorded, the disk D has no information to be recorded. The information signal contained in the image is well recorded as a charge image.

In addition, in FIG. 11, illustrations and explanations of the optical system consisting of the objective lens and other lenses used in the configuration of the recording/reproducing system are omitted to avoid the complexity of one illustration (this point is The same applies to FIGS. 17 and 18, which will be described later, and FIG. 1, and FIGS. 6 to 8, which have already been described.)

In addition, reading out the charge image from the recorded disk D is as follows:
This can be done by projecting a laser beam of a constant intensity from the beam splitter Pb52 onto the disc D, and the reflected light from the disc D is reflected by the beam splitter pbs2 and then the rotating polarizer. 5
0, the rotating polarizer 50 supplies the photodetector PD with light that shows a change in light intensity corresponding to the information signal recorded on the disk D, and the photodetector PD supplies the light that shows a change in light intensity corresponding to the information signal recorded on the disk D. An 11%" sequence signal corresponding to the information signal recorded in the 11%" sequence signal is output.

Next, the recording and reproducing apparatus shown in FIG. By rotating the child 50 in synchronization with the rotation of the disk D, the direction of the polarization plane of the laser beam and the direction of the crystal axis and the orientation direction X of the optical modulation of the disk D are kept in a constant relationship. This is an example in which the first
In FIG. 7, Pbs is a beam splitter.

Further, the recording/reproducing apparatus shown in FIG. 18 has a laser light source LS.
The linearly polarized laser beam PIll emitted from the rotary polarized beam 5J is incident on the wave plate WP, and the rotationally polarized beam 5J is inserted into the optical path between the disk D and the photodetector PHL. By rotating the mirror 50 in synchronization with the rotation of the disk I), the direction of the polarization plane of the laser beam and the direction and orientation of the crystal axis of the optical RiJ material of the disk D can be adjusted. Side J with constant direction and direction.

Retained 1'! : This is an example in which the figure is shown in FIG. 18.

where Pbs is a beam splitter.

(Effects of the Invention) As is clear from the above detailed explanation, the recording/reproducing device of the present invention includes a member having a luminous intensity phase having optical anisotropy in the crystal axis or orientation, and a charge retention layer. A charge pattern corresponding to the information signal to be recorded is formed on a rotating recording medium disc made up of 1.7 laser beams, and a rotating recording medium disk is also rotated using laser beams. A recording/reproducing device configured to read a charge pattern on a recording medium disk, the device comprising: a first rotary drive mechanism for driving and rotating a rotary recording medium at a predetermined angular velocity; The rotation center is the position of the laser beam incident on the medium disk, and the rotational angular velocity of the above-mentioned rotating recording medium disk is the same.

The above-mentioned disk-shaped rotation i\[! a second rotational drive mechanism for driving and rotating the rotation center position rt of the recording medium;
A recording/reproducing device capable of maintaining a substantially constant relationship between the polarization plane of a laser beam and the direction of a crystal axis or orientation of a member made of a light modulating material of a rotating recording medium disk; An information signal to be recorded using one laser beam is applied to a rotating recording medium disk that includes a member made of a light intensity modulator having optical anisotropy in orientation, etc., and a charge retention layer. The corresponding charge pattern allows the hair to form.

Also, a member made of a light modulating material that is used as a component of a five-rotation recording medium disk in a recording and reproducing apparatus that uses a laser beam to read a charge pattern transmitted on a rotating recording medium disk. A member such as a light modulating material is arranged so that the direction of orientation is in the direction of the circle Jl'i1 or the radial direction on the rotating recording medium disk, and the polarization plane of the laser beam and the light modulation of the rotating recording medium disk are adjusted. A recording/reproducing device, and a crystal 1liI, which are made of a member made of a material [Jl'j, which is arranged so that the directions of orientation thereof can be maintained in a constant relationship with each other; I
A rotating recording medium disk comprising a member made of a light modulating material and a charge retention layer, which also has optical anisotropy in the direction of orientation, etc., is used with a laser beam to record the object 1 ': 5 A recording/reproducing device that forms a charge pattern corresponding to an information signal being transmitted and reads the charge pattern on a rotating recording medium disk using a laser beam. The crystal axes and orientation directions of the members made of the light modulating material used as constituent parts of the medium disk are set in substantially the same predetermined direction with respect to the radial direction of the rotating recording medium disk. A plurality of recording and reproducing areas are provided on a rotating recording medium disk, and the polarization plane of the laser beam is determined by the direction and orientation of the crystal axis of the light modulating material of the plurality of recording and reproducing areas in the IB in the rotating recording medium. A recording/reproducing device capable of maintaining a substantially constant relationship with the direction, and a member made of a light modulating material having optical anisotropy in the direction, 111I4ijI or orientation, and a charge retention layer. A charge pattern corresponding to an information signal to be recorded is formed on a rotating recording medium disc using a laser beam, and a charge pattern on the rotating recording medium disc is formed using a laser beam. A recording/reproducing device that performs reading by rotating the polarization plane of the laser beam corresponding to one rotation of the recording medium disk, thereby changing the polarization plane of the laser beam and the light modulating material of the rotating recording medium disk. Since the recording/reproducing apparatus of the present invention is capable of maintaining a substantially constant relationship between the direction of crystal axes and the direction of orientation in a member, the recording/reproducing apparatus of the present invention is capable of maintaining a substantially constant relationship with the crystal axis direction and orientation direction of the member. When a recording medium comprising a member made of a light modulating material having optical anisotropy in the crystal axis or orientation and a charge retention layer is used as a recording medium, the recording medium is a rotating recording medium. When configured as a disk, it has optical anisotropy in the direction of the polarization plane of the laser beam for recording and reproduction, and in the crystal axes or orientations used in some of the constituent members of the rotating recording medium disk. The point that recording and reproduction could not be performed satisfactorily in some cases was caused by the relationship between the direction of the crystal axis and the direction of orientation in a member made of a light modulating material changing due to one rotation of the recording medium disk. This problem can be solved well and the polarization plane of the laser beam can be maintained in a substantially constant relationship with the direction of the crystal axis and the direction of orientation in the member made of the light modulating material of the rotating recording medium disk.
According to the present invention, the above-mentioned conventional problems can be satisfactorily solved.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a schematic configuration of the main parts of the recording and reproducing apparatus of the present invention, and FIGS. 2 to 5 are the structural principles and operating principles of the recording and reproducing apparatus of the present invention shown in FIG. 6 to 8, FIG. 11, FIG. 17, and FIG. 9 and 10 are enlarged sectional views showing the configuration of the recording DIJX body, and FIGS. 12 and 13 are diagrams for explaining the configuration principle and operating principle of the accent recording and reproducing apparatus of the present invention shown in FIG. 11, FIG. 14 is a block diagram for explaining the problem, and FIGS. 15 and 16 are block diagrams of the recording/reproducing apparatus. Dl...Recording medium, Etl, Et2...Transparent electrode, PCL...Photoconductive layer member, DML...Dielectric mirror PML...Light having optical anisotropy in crystal axis or orientation, etc. A member made of a modulating material, DMLr...dielectric mirror, Et...transparent electrode, D...consisting of a light modulating material having optical anisotropy in crystal axis or orientation, etc., and a charge retention layer. Rotating recording medium disc (disk), M1 to M3...Motor, TT...Turntable, LS, LSI, LS2...Laser light source, PQ,
Pfll, P122...Laser light, PMODI~PM
ODA... Optical modulator, PD... Photodetector, 1, 2.
... Laser light source, 3-7... Lens, 8, 9... Polarizer, 10... Light modulator, 11.12... Wave plate,
13, 14...Analyzer, 15...Beam splitter, 16...Photoelectric converter, 17...Amplifier, 18...
・Output terminal, 19° 20... Selector switch, 21...
・Signal source of the information signal to be recorded (signal source), 2
2... Power supply that applies a predetermined voltage between the transparent electrodes Etl and Et2 of the recording medium D1, 23,24Pb s, I"s
l, Pb s2-beam splitter, 25, 26.33
... Glass substrate, 27.35 ... Transparent electrode, 28,
31... Alignment film, 29° 30... Spacer, 32.
...Dielectric mirror 34...Charge retention layer, 36.42
...Rotating shaft, 37... Clamper, 38... Transfer table, 39... Feed screw, 4o... Rotating member driven and rotated by motor M2, 41... Weight, 44-47...
...Input terminal for modulation signals to optical modulators PMODI to PMOD4, 48.49...Polarizer, 50° 51...Rotating polarizer Indication of 1986 Patent Application No. 3.766 B No. 5 2゜Name of Invention Recording and Reproducing Device 3゜Relationship with the Amendment Case Patent Applicant Address: 3-12 Moriyamachi, Kanayō-ku, Yokohama-shi, Kanagawa Prefecture number j
(C name (432) Victor Company of Japan Co., Ltd. 4, Written amendment to the attorney's procedure (voluntary) 1. Indication of the case 1988 Patent WR No. 176685 2, Name of the invention recording and reproducing device 3, Person making the amendment Related Patent Applicant Address 3-12 Moriya-cho, Kanayō-ku, Yokohama, Kanagawa Prefecture Name (4,32) Victor Company of Japan 4, Agent Facsimile 03 (472) 2257-5 Date of amendment order (voluntary) 6. Subject of amendment 76 Contents of amendment (1) The claims are amended as shown in the attached sheet. (2) From page 28, line 20 of the specification to page 32, line 16, “
It is used to record issues and provide recorded information. ” is corrected as follows. In the reproducing operation when reproducing the information signal by projecting the light onto the recorded recording medium obtained by recording No. 1,
There is a specific relationship between the direction of the polarization plane of the nose light and the direction of the crystal axis and orientation of the light modulating material! ,;': What needs to be done can be understood from the explanation of the already proposed recording and reproducing apparatus shown in FIGS. 15 and 16. direction, and the direction of the crystal axis or orientation of a member made of a light modulating material that has optical anisotropy in the crystal axis or orientation used in some of the constituent members of the rotating recording medium disk. There was a need for a solution to the problem that recording and reproduction cannot be performed satisfactorily due to changes in the relationship between the two rotations due to one rotation of the recording medium disc (Means for solving the problem) The present invention comprises a member made of a light modulating material having optical anisotropy in the crystal axis or orientation, and a charge retention layer. A recording/reproducing device that forms a charge pattern corresponding to a target signal and reads the charge pattern on a rotating flash medium disk using electromagnetic radiation tIA flux. , a first rotary drive mechanism that drives and rotates the rotary recording medium 1i at a predetermined angular velocity, and an IIE# that rotates the recording medium 1i at a predetermined angular velocity;
1lli radial east position [radial center, the center of rotation of the disk-shaped rotating 2-plow medium described above with the same rotational angular velocity as the rotational angular velocity of the rotating recording medium disk mentioned above, and opposite to the rotational direction of the rotating recording medium disk. and a second rotational drive mechanism for driving and rotating the position of the rotary recording medium, and the polarization plane of the electromagnetic radiation flux and the direction of the crystal axis or orientation of the member made of the light modulating material of the rotating recording medium disk are approximately the same. A rotating recording medium comprising a recording/reproducing device capable of maintaining a constant relationship between the two, a member made of a photometric material having optical anisotropy in five crystal axes or orientations, and a charge retention layer. The disk is charged with electrical charge fluctuations corresponding to the information signal being recorded (;
-, and the charge pattern on the same transcription B medium disk is read using electromagnetic radiation.
``!+'' is a recording/reproducing apparatus designed to
It can be done circumferentially or radially.'+1
．． 9. A member made of a light modulating material is arranged so that the polarization plane of the electromagnetic radiation flux and the direction of orientation in the member made of the light modulating material of the rotating recording medium disk can be maintained in a substantially constant relationship. A recording/reproducing device having two types of optical anisotropy in the direction of crystal #l Iis-vib orientation, etc., and a rotating device comprising a member made of a light modulating material and a charge retention layer. Charge butterflies corresponding to the information signals to be recorded (11. 91. The recording and reproducing device τX is used for reading the information, Al1 is used as a component of the rotating recording medium disk, and the light modulating material used is 1. The direction of the crystal axis and orientation of the material. However, rotational recording W; a plurality of recording/reproducing areas arranged in a predetermined substantially same direction with respect to the radial direction of the disk are provided on a rotating recording medium disk, and rotation is made in the same direction as the polarization plane of the electromagnetic radiation flux. A recording and reproducing device capable of maintaining a substantially constant relationship with the direction of the crystal axis and the direction of orientation in a member made of a light modulating material in the plurality of recording and reproducing areas of the recording medium disk, and the crystal axis or Comprising a member made of a light modulating material having optical anisotropy in orientation, etc., and a charge retention layer. A recording/reproducing apparatus is configured to form a charge pattern with a rotation of a recording medium disk using an electromagnetic radiation flux [1. By rotating the polarization plane of the electromagnetic radiation flux in accordance with (3) On page 35 of the specification, line 15, "It can be realized by the configuration." is amended as follows: r In the recording and reproducing apparatus shown in FIG. 1, which can be realized by the configuration, pil is used for recording information on disk D and for reading and reproducing information recorded on disk D. The electromagnetic radiation flux pm is emitted from a source of electromagnetic radiation (not shown). Electromagnetic radiation refers to light in a broad sense, that is, radiation in the entire spectrum range of radiation called electromagnetic waves (including the range from γ-rays, X-rays, etc. to long-wave radio waves). In the embodiments described herein, a source of electromagnetic radiation and a
7, a laser light source is used, and electromagnetic radiation flux (laser light flux) PQ emitted from the laser light source is used. (4) Specification page 48, line 12 to page 51, lines 1 and 2 ``The recording/reproducing apparatus of the present invention has a crystal axis...
...This record of the present invention" is amended as follows. [1] The recording/reproducing device of the present invention includes a rotating recording medium disk comprising a member made of a light modulating material having optical anisotropy in the crystal axis or orientation, a charge retention layer, and hair.
A recording/reproducing apparatus that forms a charge pattern corresponding to an information signal to be recorded and reads the charge pattern on a rotating recording medium disk using electromagnetic radiation flux, A first rotary drive mechanism that drives and rotates the rotating recording medium disk at a predetermined angular velocity, and rotation of the rotating recording medium disk with the rotation center at the position of the electromagnetic radiation flux incident on the rotating section S medium disk. a second rotational drive mechanism configured to drive and rotate the center of rotation of the disk-shaped rotating recording medium in a direction that is the same as the angular velocity and opposite to the rotational direction of the rotating recording medium disk; Polarization plane and rotation of electromagnetic radiation flux #lf
A recording/reproducing device capable of maintaining a substantially constant relationship between the direction of the crystal axis and the direction of orientation in a member made of a light modulating material of the I & body disk, and an optical anisotropy in the crystal axis or orientation. A rotating part that includes a member made of a light modulating material and a charge retention layer [a charge pattern corresponding to the information signal to be recorded is formed in the internal cavity].
i, lta, 1! A recording/reproducing device in which a charge pattern on a rotating recording medium disk is read using electromagnetic radiation, the direction of orientation of a member made of a light modulating material used as a component of the rotating recording medium disk. is 1
A member made of a light modulating material is arranged in the circumferential direction or radial direction of the rotating recording medium disk, and the polarization plane of the electromagnetic radiation flux and the orientation direction in the member made of the light modulating material of the rotating recording medium disk are determined. A recording and reproducing device capable of maintaining a substantially constant relationship between 41111;', in the rotating recording medium configured. A recording/reproducing device that forms a charge pattern corresponding to the information signal to be recorded, and reads the charge pattern on the rotating recording medium disk using electromagnetic radiation flux. But. The direction of the crystal axis and orientation of the light modulating material used as the component of the rotating recording medium disk. A plurality of recording and reproducing areas, which are predetermined in advance and oriented in substantially the same direction with respect to the radial direction of the rotating recording medium disk, are installed in the rotating recording medium 5, and the polarization plane of the electromagnetic radiation flux is adjusted to the rotating recording medium. A recording and reproducing device capable of maintaining a substantially constant relationship between the directions and orientations of crystal axes in a member made of a light modulating material in the plurality of recording and reproducing regions described above in a disk, and crystal axes or orientations. A rotary recording medium disc comprising a member made of luminous material having optical anisotropy at its corners and a U load holding layer is provided with an information signal j, which is the object of fA9. Forms a charge bata-n and also emits electromagnetic radiation! 1! ! A recording/reproducing apparatus that reads a charge pattern on a co-rotating recording medium disk using a bundle of co-transfers (by rotating the polarization of an electromagnetic radiation flux in correspondence with the rotation of an α-medium disk, This is because it is a recording and reproducing device that can maintain a substantially constant relationship between the polarization plane of the electromagnetic radiation flux and the direction of the crystal axis or orientation of the member made of the light modulating material of the co-rotating recording medium disk. ``Record of the present invention'' ``Claim 1〉 A rotary orientation medium disk comprising a member made of a photonic blade material having optical anisotropy in crystal axis or orientation, etc., and a charge retention layer. , , , t,4g to form a w1 charge pattern corresponding to the targeted information signal, and also use electromagnetic radiation flux to read out the w1 charge pattern on the rotating recording medium disk. A recording/reproducing apparatus comprising: an eleventh rotational drive mechanism for driving a rotating recording medium disk at a predetermined angular velocity P; Rotation of the disk-shaped rotating recording medium with the position of the line-bundle as the center of rotation, at the same rotational angular velocity as the rotational angular velocity of the rotating recording medium disk, and in a direction opposite to the rotational direction of the rotating recording medium disk. A second rotational drive mechanism is used to drive and rotate the center position, and the polarization plane of the !iJ1M helix and the crystal axis of the part 1c made of the photometric material of the rotating recording medium disk are The recording/reproducing device 2 includes a member made of an optical material having optical anisotropy in the crystal axis or orientation, and a charge retention layer, so that the direction of the crystal axis or the orientation direction can be maintained in a substantially constant relationship. A charge pattern corresponding to the information signal targeted for recording is formed on a rotating recording medium disc including A recording/reproducing device configured to read a charge pattern, wherein the direction of orientation of a member made of a light modulating material used as a component of a rotating recording medium disk is 6, and the circumferential direction of the rotating recording medium disk. Alternatively, by arranging a member made of a light modulating material so as to be radial, the polarization plane of one ray beam and the member made of a light modulating material of a rotating recording medium disk are oriented I'j. A recording and reproducing apparatus capable of maintaining a substantially constant relationship with the direction of the recording and reproducing apparatus, which includes a member made of a light modulating material having optical anisotropy in the direction of the crystal axis or orientation, and a charge retention layer. A charge pattern corresponding to the information signal targeted for recording is formed on a rotating recording medium disk consisting of a, and! The present invention is a recording/reproducing main device in which a charge pattern on a rotating recording medium disk is read using an EJElt s. The crystal axes and orientation directions of members made of light modulating materials used as constituent members of the rotating recording medium disk are predetermined and sometimes the same direction with respect to the radial direction of the rotating recording medium disk. A plurality of recording and reproducing areas are provided on a rotating recording medium disk, and jl! J! -Radiation-ray flux. The polarization plane of the #1#E body disk can be maintained in a substantially constant relationship with the direction of the crystal axis and the direction of orientation in the member made of the light modulating material in the plurality of recording and reproducing areas described above in the same transcription #1 #E body disk. Recording/playback device

Claims (1)

[Claims] 1. Recording is performed using a laser beam on a rotating recording medium disk, which is composed of a member made of a light modulating material having optical anisotropy in the crystal axis or orientation, and a charge retention layer. A recording/reproducing device that forms a charge pattern corresponding to an information signal and reads the charge pattern on a rotating recording medium disc using a laser beam, the recording/reproducing device rotating the recording medium at a predetermined angular velocity. A first rotational drive mechanism that drives and rotates the disk, and a position of the laser beam incident on the above-mentioned rotating recording medium disk is the center of rotation, and the rotational angular velocity of the above-mentioned rotating recording medium disk is the same,
and a second rotational drive mechanism that drives and rotates the position of the rotation center of the disk-shaped rotating recording medium in a direction opposite to the rotational direction of the rotating recording medium disk, and polarizing the laser beam. A recording/reproducing device 2 that is capable of maintaining a substantially constant relationship between the direction of the crystal axis and the direction of orientation in the member made of the light modulating material of the rotating recording medium disk, A charge pattern corresponding to an information signal to be recorded is formed using a laser beam on a rotating recording medium disk that includes a member made of a tropic light modulating material and a charge retention layer. Further, there is provided a recording and reproducing apparatus in which a charge pattern on a rotating recording medium disk is read using a laser beam, the orientation of a member made of a light modulating material used as a component of the rotating recording medium disk. The member made of the light modulating material is arranged such that the direction of A recording/reproducing device 3 capable of maintaining a substantially constant relationship with the direction of orientation, including a member made of a light modulating material having optical anisotropy in the crystal axis or direction of orientation, and a charge retention layer. A laser beam is used to form a charge pattern corresponding to the information signal to be recorded on a rotating recording medium disk, and a laser beam is also used to read the charge pattern on the rotating recording medium disk. A recording/reproducing device configured to perform a rotation recording medium disk in which the direction of the crystal axis or orientation of a member made of a light modulating material used as a component of the rotating recording medium disk is relative to the radial direction of the rotating recording medium disk. A plurality of recording/reproducing areas arranged in substantially the same predetermined direction are provided on a rotating recording medium disk, and the polarization plane of the laser beam and the light modulating material of the plurality of recording/reproducing areas on the rotating recording medium disk are A recording/reproducing device 4 capable of maintaining a substantially constant relationship with the direction of a crystal axis or orientation in a member made of a light modulating material having optical anisotropy in the crystal axis or orientation. A charge pattern corresponding to an information signal to be recorded is formed on a rotating recording medium disc including a charge retention layer using a laser beam, and A recording/reproducing device configured to read a charge pattern on a disk, the polarization plane of the laser beam and the rotating recording medium disk being read by rotating the polarization plane of the laser beam corresponding to the rotation of the rotating recording medium disk. A recording/reproducing device capable of maintaining a substantially constant relationship between the direction of a crystal axis and the direction of orientation in a member made of a light modulating material.