JPH1064167A - Disk recording and playback device - Google Patents

Abstract

(57) [Problem] By using two or more optical pickup devices in combination with two or more turntables, it is possible to easily perform advance reading, read confirmation immediately after writing, editing and writing, etc. Provided is a recording / reproducing device. SOLUTION: Optical discs Da and Db for recording and / or reproducing information are mounted, and optical discs Da and Db mounted on the spindles are arranged side by side at a predetermined distance so as not to contact each other. Two or more turntables that are driven to rotate by the motors 6a and 6b are provided. It is provided with two or more optical pickup devices 12a and 12b capable of reading and / or writing information signals to and from optical disks Da and Db mounted on two or more turntables 7a and 7b, respectively. At least one of the two or more optical pickup devices 12a and 12b can read and / or write information signals on two or more optical disks Da and Db mounted on the turntables 7a and 7b. So that

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing apparatus provided with two or more turntables and two or more optical pickup devices, and more particularly, to a disk-shaped recording medium mounted on each of two or more turntables. 2 for
By selectively operating the optical pickup device described above, recording / recording at a plurality of locations on one disk-shaped recording medium is performed.
The present invention relates to a disk recording / reproducing apparatus which enables reproduction at the same time or enables simultaneous reproduction / recording or copying of two or more disk-shaped recording media.

[0002]

2. Description of the Related Art Conventionally, a disk recording / reproducing apparatus for recording and / or reproducing information using a so-called optical disk as a disk-shaped recording medium, such as a CD (compact disk) or a DVD (digital video disk), has been generally used. It has one turntable on which an optical disc is mounted, and one optical pickup device provided so as to be able to approach / separate from the turntable.

An optical disk is horizontally mounted on a turntable attached to a rotating shaft of a spindle motor and is driven to rotate. On the other hand, an objective lens of an optical pickup device directs a laser beam vertically to an information recording surface of the optical disk. Irradiation is performed so that an information signal is recorded on the information recording surface and the information signal recorded on the information recording surface is reproduced while the objective lens is horizontally moved radially outward from the center of the optical disk.

[0004]

However, the conventional disk recording / reproducing apparatus has one turntable and one optical pickup device, and one optical disk mounted on the turntable. In contrast, one optical pickup device reads out an information signal recorded in advance on an information recording surface of an optical disk or newly writes an information signal on the information recording surface.

Therefore, in the conventional disk recording / reproducing apparatus, a new information signal is simultaneously written while reading an information signal recorded in advance, or an information signal is simultaneously read or written to two optical disks. However, there is a problem in that the functions that can be used in this type of disk recording / reproducing apparatus are few and the applications are limited.

In this case, by simply connecting the two disk recording / reproducing apparatuses with a code line or the like, a new information signal is simultaneously read on the other optical disk while reading the information signal recorded on one optical disk. Writing, a so-called dubbing function, can be executed. However, when two disk recording / reproducing devices are connected, the combined effect of the dubbing function or more cannot be exerted, and the effects obtained individually when two disk recording / reproducing devices are connected are merely provided. And a connector, a cord, and the like for connecting the two disk recording / reproducing devices are required, which is uneconomical.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and uses two or more optical pickup devices in combination with two or more turntables, thereby precedent reading and reading immediately after writing. It is an object of the present invention to easily perform confirmation, editing and writing, etc., and to improve and expand the functions and applications of this type of device.

[0008]

In order to solve the above-mentioned problems and achieve the above object, a disk recording / reproducing apparatus according to the present invention provides a disk-shaped recording medium for recording and / or reproducing information. Are mounted, and two or more turntables are arranged side by side at a predetermined distance from each other so as to prevent the disk-shaped recording media mounted thereon from coming into contact with each other, and are rotationally driven by a spindle motor.
Two or more optical pickup devices capable of reading and / or writing information signals from / to a disk-shaped recording medium mounted on each of the above turntables; and at least one of the two or more optical pickup devices
The individual optical pickup devices are characterized in that they are arranged so as to be able to read and / or write information signals on two or more disk-shaped recording media mounted on a turntable.

According to the above-described configuration, according to the disk recording / reproducing apparatus of the present invention, an information signal recorded in advance on one optical disk mounted on the turntable is simultaneously read and newly recorded. Information signals or read / write information signals to / from two optical disks at the same time. Improve and expand functions and applications such as pre-reading, read confirmation immediately after writing, editing / writing, etc. Can be achieved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show an embodiment of the present invention, which is applied to a recording / reproducing disk recording / reproducing apparatus including a read-only optical pickup apparatus and a write / read optical pickup apparatus. FIG. 1 is a front view, FIG. 2 is a plan view, FIG. 3 is a block diagram of a focus control circuit, and FIG. 4 is an explanatory diagram of focus control.

First, two disc-shaped recording media applied to the disc recording / reproducing apparatus of this embodiment will be described. In this embodiment, a read-only (read-only) optical disk (RO type CD), which is a specific example of a disk-shaped recording medium, is used as one optical disk Da, and a disk-shaped recording medium is used as the other optical disk Db. A write-once type (write-once) optical disk (WO-type CD) showing another specific example is used. Incidentally, these optical discs D
As a and Db, a read-only optical disk or a write-once optical disk can be used.
Further, a rewritable optical disk (RW type CD) that can be rewritten can be used.

An RO type CD optical disk Da has a disk substrate formed of a synthetic resin material such as polycarbonate, for example, in a disk shape, and a central portion of the disk substrate has a chuck having a diameter of, for example, about 15 mm. King hole is drilled. The main surface, which is one surface of the disk substrate, is a signal recording surface. When the disk substrate is formed by injection molding, pits, which are fine irregularities, are formed. The pits correspond to digital information signals recorded on the optical disk, and a reflection layer made of a metal such as aluminum is formed on the signal recording surface.

The other WO-type CD optical disk Db has a pair of disk substrates formed in a disk shape from a synthetic resin material such as polycarbonate, for example. Are formed. Between the disk substrates, a pair of disk-shaped recording layers for recording information, and an air layer provided between the two recording layers to easily form an information recording hole formed in the recording layer. An information recording unit having an air sandwich structure is provided. The recording layer of the information recording section is formed of a metal-based Te-C recording material or the like or an organic cyanine dye or the like, and information is recorded by forming holes (pits) in the recording layer with a laser beam. Is done.

As shown in FIGS. 1 and 2, a disk recording / reproducing apparatus according to this embodiment in which such optical disks Da and Db are used as an information recording medium has a flat plate shape formed of a plate material such as a steel plate. A base plate 1 and a chassis plate 2 are provided. The base plate 1 has a rectangular shape slightly larger than two compact discs 12 cm in diameter, for example. On the upper surface of the base plate 1, a rectangular chassis plate 2 narrower than the base plate 1 is elastically supported by three mount insulators 3 as an impact mitigation mechanism for preventing transmission of vibration. I have.

For this reason, support portions 2a protruding outward are provided at three places on the long side of the chassis plate 2, respectively, and one mount insulator 3 is arranged below each support portion 2a. A mounting screw 4 is screwed into each support portion 2a from the upper surface.
The chassis plate 2 is supported and fixed on the base plate 1 via a mount insulator 3 connected by the above.

The chassis plate 2 forms a frame having rectangular openings 5a and 5b at the center and one side in the longitudinal direction, and two lower surfaces on both sides of the center opening 5a. The spindle motors 6a and 6b are arranged side by side and fixed. Two spindle motors 6a, 6b
Each of the rotating shafts 36a and 36b penetrates the chassis plate 2 and projects upward in parallel with each other. And at the tip of each rotation shaft 36a, 36b,
The turntables 7a and 7b are fixed so that the mounting surfaces of the optical disks Da and Db are horizontal to each other.

Centering guides 37a and 37b into which the center holes of the optical disks Da and Db are fitted are provided at the upper center of the turntables 7a and 7b. A magnet for chucking is attached to the center of the centering guides 37a and 37b, and the optical discs Da and Db are positioned by the centering guides 37a and 37b so that the optical disks Da and Db are turned.
It is detachably attached to. In the present device, a chucking member (not shown) is installed so as to face these turntables 7a and 7b.

The chucking member is a disc-shaped member that is attracted by a magnet such as an iron plate, and is provided by a frame at a predetermined position on the inner surface side of a top chassis (not shown), that is, a position facing the turntables 7a and 7b. It is rotatably supported. The chucking member is attracted to the turntables 7a and 7b by the magnets on the turntables 7a and 7b, so that the optical disks Da and Db are turned on the turntables 7a and 7b.
It is chucked and rotationally driven while being positioned above.

Such two turntables 7a, 7
The distance between the optical discs Da and b is such that a gap of an appropriate size (for example, about 5 mm to 10 mm) is formed between the optical discs Da and Db mounted on the turntables 7a and 7b, that is, two optical discs Da. , Db are set so as not to contact each other. The distance between the optical disks Da and Db can be made longer than the above-mentioned length. However, if it is made longer, the base plate 1 and the chassis plate 2 become larger than necessary, resulting in an increase in the size of the apparatus.

On the other hand, if the distance between the two optical disks Da and Db is smaller than the above-mentioned length, for example, the optical disk Db of the other turntable 7b is replaced while the optical disk Da mounted on the one turntable 7a is being reproduced. When trying to do so, the hand may tremble or the like, which may cause an accident in which the other optical disc Db comes into contact with the one optical disc Da. Therefore, such optical discs Da and Db
In order to prevent contact accidents, both optical discs Da and D
It is necessary to take measures such as providing a partition wall between b. Also in this case, in an apparatus having an auto changer mechanism for automatically changing a disk, the optical disk D
Is precisely controlled mechanically,
No countermeasures such as providing partition walls are required.

The chassis plate 2 has two pairs of guide shafts 8a, 8b and 38a which are parallel to the center line L connecting the rotation centers Oa and Ob of the two turntables 7a and 7b and parallel to each other. , 38b are attached. The pair of guide shafts 8a and 8b
Pairs of bearing pieces 9a, 9b erected so as to oppose each other at the edges on both sides in the center line L direction of the central opening 5a.
The carriage 10a is slidably supported by the guide shafts 8a and 8b.

The other pair of guide shafts 38a and 38b are formed as two pairs of bearing pieces 39a and 39b which are erected so as to face each other at both edges of the side opening 5b of the chassis plate 2 in the center line L direction. Are supported at both ends by the carriage 1.
0b is slidably supported. For this reason, each of the carriages 10a and 10b has one guide shaft 8 attached thereto.
a and 38a are slidably engaged with the bearing groove 11a, and the other guide shafts 8b and 38b are provided with a bearing hole 11b slidably inserted therein, and the two guide shafts 8a, 8b and 38a are provided. , 38b can be moved in the axial direction. These carriages 10a and 10b are equipped with optical pickup devices 12a and 12b, respectively, and are integrally provided with racks 13a and 13b so as to be located outside the guide shafts 8b and 38b.

The first optical pickup device 12a has a C
D, DVD (Digital Video Disk) and other read-only optical disks Da. These are used for semiconductor lasers, collimator lenses, beam splitters, detectors, λ /
It has a four-wavelength plate, an objective lens 14a, etc., and is composed of an optical system and a drive system. The objective lens 14a forming a part of the optical system is turned upward so that the above-mentioned center line L and the optical axis intersect at right angles, and the turntable 7a
Is provided so as to face the lower surface of the optical disk Da mounted on the optical disk.

Further, the second optical pickup device 12b
Is used for the write-once recording optical disc Db.
A shaping prism is added to the configuration of the read-only optical pickup described above. This shaping prism is for shaping the elliptical beam waveform near the laser into a circular shape. Unlike the read-only recording type, this write-once recording optical pickup has a large size for making a hole in the recording layer at the time of writing. Since light energy is required, it is provided from the necessity of effectively utilizing all laser light. The objective lens 14b of this write-once type recording optical pickup is also directed upward so that its optical axis intersects the center line L at right angles to the objective lens 14a, similarly to the above-described objective lens 14a. It is provided so as to face the lower surface.

Thus, the first and second optical pickup devices 12a and 12b collect the laser light from the semiconductor laser and irradiate the target position on the information recording surface of the optical disks Da and Db, and reflect the reflected light. The information signal is reproduced by converting it into an electric signal. Further, the second optical pickup device 12
b, a laser beam from a semiconductor laser is condensed and irradiated to a target position on an information recording surface of an optical disc Db, and an information signal is recorded by making a hole in the information recording surface by effectively utilizing all of the laser light. You can also.

Therefore, the first and second optical pickup devices 12a and 12b are provided with a laser driving circuit for generating a laser beam by using a semiconductor laser to form a laser beam spot, and for detecting a displacement of the laser beam spot. A photodetector, an information detection circuit for reading information written on a track on the information recording surface, a signal processing circuit for converting the read information to a predetermined signal, and returning the converted information to the original state at the time of reproduction. Provided.

The drive systems of the first and second optical pickup devices 12a and 12b mainly perform focusing control, tracking control, and the like to determine the relative positional relationship between the target position on the information recording surface and the laser light spot. This is a drive mechanism for always maintaining a constant. The drive system for the focusing control is driven by these drive systems to drive the objective lens 1.
A focus control circuit 15 (described later) that causes the 4a and 14b to follow the shake of the disk surface, a tracking control circuit that drives a tracking control drive mechanism to make the objective lenses 14a and 14b follow the track shake, and a rotating system including the disk It has a rotation control circuit and other control circuits for controlling the rotation servo system so as to achieve the target rotation speed.

The carriages 10a, 1 on which the optical pickup devices 12a, 12b having such a configuration are mounted.
0b is a pickup feed mechanism 20a, 20b, respectively.
The guide shafts 8a, 8b and 38a, 38b are fed and moved in the axial direction. Two sets of pickup feed mechanisms 20
a and 20b have exactly the same configuration except that the lengths of the racks 13a and 13b are different.

That is, the pickup feed mechanisms 20a, 20
b denotes feed motors 21a and 21b attached to the chassis plate 2, output gears 22a and 22b fixed to the rotation shafts of the feed motors 21a and 21b, and first gears meshed with the output gears 22a and 22b. Intermediate gear 23
a, 23b, second intermediate gears 24a, 24b meshed with the first intermediate gears 23a, 23b, and a driving gear 2 formed integrally with the second intermediate gears 24a, 24b.
5a and 25b.

The pickup feed mechanisms 20a, 20b
Drive gears 25a, 25b
b are engaged with the racks 13a and 13b, respectively.
The first intermediate gears 23a and 23b are rotatably supported by support shafts 26a and 26b erected on the chassis plate 2, and the drive gears 25a and 25b and the second intermediate gears 24a and 24b are Similarly, it is rotatably supported by support shafts 27a and 27b which are also provided upright on the chassis plate 2.

Thus, by rotating the feed motors 21a and 21b in the normal or reverse direction, the carriages 10a and 10b are driven by the pair of guide shafts 8a and 8b in accordance with the rotation direction.
And the first optical pickup device 12a is guided by the two turntables 7 and 38a and 38b, respectively.
The second optical pickup device 12b moves so as to approach or separate from the turntable 7b selectively.

Then, such carriages 10a, 1
0b, so that the carriages 10a and 10b do not abut on any of the turntables 7a and 7b.
Limit switches 28a, 28b and 29a are provided as position detectors. These limit switches 28a, 28b and 29a are connected to the carriages 10a, 10b.
b is located inside a position where the tracks located on the innermost circumference of the information recording surface of both optical discs Da and Db can be sufficiently read, that is, on the side closer to each of the turntables 7a and 7b. It is fixed to the chassis plate 2.

As a result, as shown in FIG. 2, when the first carriage 10a moves to the first turntable 7a side, the limit switch 28a is moved to the position shown by the broken line.
To turn it on to stop the movement of the carriage 10a to prevent the first optical pickup device 12a from colliding with the first turntable 7a. Similarly, when the carriage 10a moves toward the second turntable 7b, the limit switch 2 is moved to the position indicated by the two-dot chain line.
8b to turn it on to stop the movement of the carriage 10a, and the first optical pickup device 12a
From colliding with the turntable 7b.

When the second carriage 10b moves toward the second turntable 7b, it contacts the limit switch 29a at the position shown by the broken line to turn it on.
The movement of the carriage 10b is stopped to prevent the second optical pickup device 12b from colliding with the second turntable 7b. When the second carriage 10b moves to a side away from the second turntable 7b, the second switch 10b contacts the limit switch 29b at a position shown by a two-dot chain line and turns on the limit switch 29b to stop the movement of the carriage 10b. Thus, the movement of the carriage 10b in the direction away from the turntable 7b is restricted.

The above-described focus control circuit 15 is similar to that shown in FIG.
It is configured as shown in FIG. The focus control circuit 15 detects variations in the height of the two turntables 7a and 7b and performs focusing control to electrically absorb the variations, and the focus error amplifier 16 and the register 17, a D / A converter 18 and an A / D converter 19. The focus error amplifier 16 of the focus control circuit 15 outputs two detection signals based on the detection signals of the photodetectors that detect the heights of the optical disks Da and Db mounted on the two turntables 7a and 7b, respectively. The difference is amplified, and a focus error signal FE corresponding to the output difference is output.

Further, the register 17 of the focus control circuit 15 is a circuit for temporarily storing information relating to focusing control. The focus control circuit 15 holds a focus error voltage as a focus error signal at this time using control timing (in this embodiment, focus zero cross: FZC) for setting the focus servo to a closed loop during the first focus search operation. . The focus error voltage is supplied to the register 17 after the analog value detected by the photodetector is converted into a digital value by the A / D converter 19. The register 17 receives a latch signal as a latch input and a reset signal as a reset input, in addition to the focus error signal.

The focus control circuit 15 outputs a focus bias signal FB as a focus bias voltage based on the focus error signal and the latch signal, and the digital value of the focus bias signal is D.
After being converted into an analog signal by the / A converter 18, the analog signal is input to the focus error amplifier 16. By correcting the focus bias with this focus bias voltage, focusing control can be performed to absorb variations in height between the two turntables 7a and 7b.

The disc player apparatus of the present embodiment having such a configuration is provided with a control device (not shown) for causing the above-described various mechanisms to perform a predetermined operation. The control device includes, for example, an 8-bit microcomputer (CPU), a storage device (ROM) in which a predetermined program is written in advance, a storage device (RAM) in which various information can be written,
U, a servo circuit and a reproduction circuit, which are controlled by
A skew control circuit and a mechanical control circuit are provided. Then, for example, two optical disks D are
The reproduction and recording of the information signal can be executed for a and Db.

First, a read-only optical disk Da is mounted on the first turntable 7a, and a write-once optical disk Db which can be written only once is mounted on the second turntable 7b. Then, each optical disk Da, Db
The chucking is completed by superposing the chucking members on each other.

Next, a predetermined command signal is input to the control device by performing an input operation, and the two spindle motors 6a and 6b are driven to drive the two turntables 7.
a and 7b are respectively driven to rotate, and the two optical discs Da and Db chucked by them are rotated at a predetermined speed.

At the same time, according to the output from the control device, the two pickup feed mechanisms 20a and 20b are selectively operated in accordance with the output contents. For example, the first carriage 10a is moved to the first turntable 7a. When it approaches, it comes into contact with one of the limit switches 28a and stops moving. Thereby, as shown by a solid line in FIG.
The first optical pickup device 12a is positioned at a position where the innermost track of the information signal recorded on the optical disk Da can be sufficiently read. On the other hand, the second carriage 10b approaches, for example, the second turntable 7b,
The movement is stopped by contacting one of the limit switches 29a. As a result, the second optical pickup device 12b is positioned at a position where the innermost track of the information signal recorded on the optical disc Db can be sufficiently read.

Next, the semiconductor lasers of the first and second optical pickup devices 12a and 12b are respectively turned on, and the respective objective lenses 14a and 14b are moved to change the beam waist of the laser beam to the respective optical disks Da and Db. A so-called focus pull-in operation is performed to bring the information recording surface up to the information recording surface. Focusing is performed so that the information recording surface is always near the beam waist of the laser beam or within the depth of focus Ha of the objective lenses 14a and 14b. At the same time, tracking operation is performed by performing a track pull-in operation of a beam for knowing which address on the disk is irradiated with the laser beam.

Thus, on the optical disk Da chucked on the first turntable 7a, the information signal recorded on the information recording surface can be reproduced by the first optical pickup device 12a. Also, the optical disc D chucked on the second turntable 7b
In b, the reproduction of the information signal recorded on the information recording surface by the second optical pickup device 12b or the recording of a new information signal on the information recording surface can be performed.

Next, the first optical pickup device 12a
Thus, the information signal recorded on the information recording surface of the second optical disc Db can be reproduced. In this case, first, the first signal is output from the control device.
The pickup feed mechanism 20a operates in the reverse direction to
The carriage 10a is moved closer to the second turntable 7b and abuts on the other limit switch 28b to stop the movement. Thereby, the first optical pickup device 12
As shown by a broken line in FIG. 4, a is positioned at a position where the innermost track of the information signal recorded on the second optical disc Db can be sufficiently read.

Subsequently, the first optical pickup device 12
The semiconductor laser of a is turned on to perform a focus pull-in operation to execute focusing. At this time, for example, there is a variation in height between the two turntables 7a and 7b as shown in FIG.
Is smaller than the height of the first turntable 7a by h, the objective lens 1 is moved from the information recording surface of the optical disc Db mounted on the second turntable 7b.
Since the distance Hb to 4a is shorter than the depth of focus Ha of the objective lens 14a by h, the focus shifts and the focus cannot be focused on the information recording surface. Therefore, in this state, the information signal recorded on the information recording surface of the second optical disc Db cannot be read.

Here, the focus control circuit 15 operates. That is, the focus error amplifier 16 of the focus control circuit 15 is connected to the first optical pickup device 12a.
And a focus error signal is output, and the focus error output FE (voltage) at this time is A / A
The data is converted into a digital value by the D converter 19 and held in the register 17. In this register 17, the value of the focus zero cross at the timing when the focus servo is closed during the first focus search operation is latched as a reference value, and a new control value is set based on this reference value and the above-mentioned held value. Is done.

The new control value set in the register 17 is converted into an analog voltage by the D / A converter 18, and this voltage value is input to the focus error amplifier 16 as a focus bias input FB. By correcting the focus bias by the focus bias voltage, the objective lens 14a of the first optical pickup device 12a is lowered, and the depth of focus Ha is formed on the information recording surface of the second optical disc Db. The difference between the heights of the two turntables 7a and 7b can be absorbed.

Thus, the reproduction of the information signal recorded on the information recording surface of the second optical disk Db can be easily performed by one optical pickup device 12a, following the reproduction operation of the first optical disk Da. Can be. Therefore, by using the first optical pickup device 12a alone,
Alternatively, the cooperative operation with the second optical pickup device 12b can easily and reliably perform continuous performance or combination performance of the two optical disks Da and Db.

Thus, the two optical pickup devices 1
By using a combination of 2a and 12b,
Various operations as described below can be realized. First, information signals recorded on one optical disc D (either a read-only CD or a recording / reproducing CD) can be read simultaneously by the two optical pickup devices 12a and 12b. Second, with respect to one recording / playback optical disc Db,
It is possible to simultaneously write in the writable part while referring to the read-only part (for example, in the case where the radially inner side of the optical disk Db is a recordable area and the outer side in the radial direction is a read-only area, the opposite area is used). May be.)

(3) One optical disk D for both recording and reproduction
Regarding b, an information signal recorded in advance is read out,
The information content can be edited and newly written on the same track or another track. 4. The information signal recorded on the read-only optical disk Da (or the read / write optical disk Db) can be copied to the read / write optical disk Db. Further, functions such as pre-reading and reading confirmation immediately after writing can be realized.

Further, in addition to the configuration of the disk recording / reproducing device described above, a third optical pickup device for recording / reproducing having the same configuration as the second optical pickup device 12b is associated with the first turntable 7a. Can be provided. In this case, two turntables 7a,
Since the two optical discs D chucked by 7b can be used as the recording / reproducing optical disc Db, the following functions can be further realized in addition to the above-described functions.

For example, two recording / playback optical disks D
Regarding b, while reproducing the information signal of the read-only section of one optical disc Db, the same contents can be simultaneously written as new information in the writable sections of the two optical discs Db. Further, with respect to the two recording / playback optical disks Db, while the information signals of the read-only portions of the two optical disks Db are sequentially reproduced, the contents can be edited and the two optical disks Db can be written as new information. The parts can be written selectively or simultaneously. As described above, the disk recording / reproducing apparatus according to the present embodiment can be used as a dual-mechanism type CD player, the same CD-ROM player, the same disk editor, and the like.

The two or more optical pickup devices 12
As shown in FIG. 2, the structures of the pickup feed mechanisms 20a and 20b can be simplified by making the movement centers of the a and 12b coincide with the center line L as shown in FIG. However, the present invention is not limited to this. For example, the movement locus of the second optical pickup device 12b may be changed to the first optical pickup device 12a.
May be orthogonal to the movement trajectory or cross at an appropriate angle.

As described above, the present invention is not limited to the above embodiment. For example, in the above embodiment, a read-only optical disk such as a CD or a CD-ROM and a write-once optical disk are disc-shaped. An example in which a recording medium is used and an example in which two write-once optical disks are used as a disk-shaped recording medium have been described. However, both rewritable optical disks capable of rewriting can be used as the disk-shaped recording medium. Can be.

Further, in the above embodiment, the write-once type C
Although an example using a perforated recording material as D has been described, the present invention is not limited to this, and a phase-change recording material, a bubble-type recording material, a texture-type recording material, or the like can be applied. . Furthermore, a magnetic head is provided in addition to the optical head, and the present invention can be applied to a magneto-optical type using a magneto-optical recording material or other types of disk recording / reproducing apparatuses.

In the above-described embodiment, an example has been described in which the spindle motors 6a and 6b are provided by the number of the turntables 7a and 7b, and each of the motors drives the turntable individually. However, only one spindle motor is used. It is also possible to provide a structure in which two or more turntables are connected so that power can be transmitted by a power transmission medium such as a rubber belt, and all the turntables are integrally rotated by one motor. Further, in the above-described embodiment, the example in which the two openings 5a and 5b are provided in the chassis plate 2 has been described, but these openings may not be provided. Thus, the present invention can be variously modified without departing from the spirit thereof.

[0057]

As described above, according to the present invention,
With the above-described configuration, a new information signal is simultaneously written to one optical disk mounted on the turntable while reading a pre-recorded information signal, or two optical disks are simultaneously written. On the other hand, information signals can be read or written at the same time, and the effect of improving and expanding functions and applications such as pre-reading, read confirmation immediately after writing, and editing / writing can be obtained. In addition, compared to a case where two or more disk recording / reproducing devices are connected and used with a connector or a connecting cord, the number of parts used can be reduced and the device can be manufactured at low cost. The effect that simplification can be obtained is obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a disk recording / reproducing apparatus according to the present invention.

FIG. 2 is a plan view showing one embodiment of a disk recording / reproducing apparatus of the present invention.

FIG. 3 is a block diagram showing an example of a focus control circuit according to the disk recording / reproducing apparatus of the present invention.

FIG. 4 is an explanatory diagram illustrating a focus operation of the disk recording / reproducing apparatus of the present invention.

[Explanation of symbols]

1 base plate, 2 chassis plate, 6
a, 6b spindle motor, 7a, 7b turntable, 8a, 8b, 38a, 38b guide shaft,
10a, 10b carriage, 12a, 12b optical pickup device, 15 focus control circuit, 1
6 focus error amplifier, 17 registers, 2
0a, 20b pickup feed mechanism, D, Da, D
b Optical disk (disk-shaped recording medium)

Claims (3)

[Claims] 1. A disk-shaped recording medium for recording and / or reproducing information is mounted, and the disk-shaped recording media mounted on each are arranged side by side at a predetermined distance so as not to contact each other. And at least two turntables rotationally driven by a spindle motor, and reading and / or reading of information signals from and to the disk-shaped recording media mounted on the two or more turntables.
Or two or more optical pickup devices capable of writing, at least one of the two or more optical pickup devices
A disc recording / reproducing apparatus, wherein the optical pickup devices are arranged so as to be able to read and / or write information signals on two or more disc-shaped recording media mounted on the turntable. 2. The disk recording / reproducing apparatus according to claim 1, wherein an information signal is read from and / or read from one of said optical pickup devices to one of said disk-shaped recording media.
Alternatively, the two optical pickup devices arranged so as to enable writing are a combination of a read-only optical pickup device and a read / write optical pickup device. 3. The disk recording / reproducing apparatus according to claim 1, wherein the two or more turntables and the two or more optical pickup devices are mounted on one chassis plate. Playback device.