JPH0469857A - Both-side recording and reproducing device and recording medium - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a double-sided recording medium for recording and reproducing 1Δ data on an F"J disk-shaped recording medium (abbreviated as 1." disc) using a 1-no. The present invention relates to a recording/reproducing device and a disc.

Conventional technology In recent years, optical disks have been developed to have high recording densities, long lifespans due to non-contact recording and playback, and significantly faster cJ compared to media such as tape. , as the 111 aircraft before regeneration, CI), VI-
, F), as a recording/reproducing device, image files, data files, document files, and many other uses.

In the field of playback devices, a fairly large market has already been formed, and with the practical use of recording and playback devices, the size of the market will be extremely large. It has 11.

In addition, in these devices other than CI), the optical head for reproducing signals or recording/reproducing is placed on the first side (hereinafter referred to as side A) for the purpose of extending continuous playback or omitting the need to change the disc 1t41. It is possible to move from the second side (hereinafter referred to as the [] side) to the second side (abbreviated as the [] side), and it is equipped with an optical head for both the A side and the 13th side, so it is possible to play back the A side and the 8th side at the same time. Devices and disks have also been proposed.

Hereinafter, an example of the conventional double-sided recording/reproducing apparatus described above will be described with reference to the drawings.

FIG. 8 shows a block diagram of a conventional double-sided recording/reproducing device, and FIGS. 9(a), (b), and (e) are schematic diagrams showing the structure of a disk used in this device.

In FIG. 8, 1 is a disk, which has a laminated structure having two recording surfaces 1a and 1b. Reference numeral 2 denotes a cartridge, which prevents the disk 1 from being exposed to the outside air and getting dirty, or from being scratched during handling. 3 is a turntable, 4 is a disc motor, and 5 is a frequency detector (hereinafter abbreviated as FG) that detects the rotation speed of the disc motor 4.
It is. Reference numeral 6 denotes a rotation control circuit, which is composed of PLL and the like.

7 is a polarity switching circuit for switching the rotation direction of the disk motor 4. Reference numeral 8 denotes a drive path, the output of which is supplied to the aforementioned disk motor 4. () is a surface detector, the output of which is supplied to the polarity switching λ circuit 7 described above.

IO is an A-side optical head for recording and reproducing signals on the A-side of the disk 10). 10 a is the above A
This is a schematic diagram of an optical beam emitted from a surface optical head 10. 11 is a linear motor, and 12 is its scanning axis, which is used to move the A-plane optical head IO in the radial direction of the disk 10.

1;) is an 11-sided optical head for recording and reproducing signals on the 13 sides of the disk 1. Reference numeral 13a schematically shows the light beam from the above-mentioned B-plane optical head l3. Numeral 14 is a linear motor, and 15 is its scanning axis, which is used to move the radar 13 in the 1' radial direction of the disk l toward the 0-plane light.

16 is a command device, and the rotation control circuit [i's 0N10F
The above-mentioned optical head 10. which issues the F command and is not shown in the drawings.
It outputs 0N10FF commands and the like for a focus control circuit (focus) circuit that controls the control circuit 13 and a track following control (tracking) circuit, and instructs the operation of the entire apparatus.

In Figure 9, 1 is a disk, and Figure (b) is:
Figures (A) and (C) show the respective surfaces. It is constructed by pasting together two 1a and 1b recording disks with opposite track spiral directions.

Regarding the double-sided recording and reproducing device configured as shown in 2 below,
The operation will be explained below.

A disk 1 is mounted on a turntable 3 and rotated by a disk motor 4. A signal proportional to the rotational speed of the disk motor 4 is output from the FG 5, compared in phase with a stable reference signal within the rotation control circuit 6, subjected to appropriate phase compensation, and then passed through the polarity switching circuit 7 and the drive circuit 8 to power amplification. After that, it is supplied to the disk motor 4, thereby forming a rotation control loop that rotates the disk 1 in an extremely stable manner.

The optical discs 10 and 13 are capable of recording and reproducing signals by causing beams 10a and 13a to follow tracks on each recording surface on the A surface 1a and the B surface 1b, respectively.

If the inner circumference is now the starting position for each head, and the A side is located at the bottom of the device as shown, disk 1 only needs to rotate clockwise when viewed from the A side of the device. However, the mounting direction of the disc 1 is not limited to the direction shown in the figure, and the B side may be on the lower side.

If the disk 1 is loaded in the opposite direction to that shown in the figure, and if the rotation direction of the disk 1 is clockwise on both recording surfaces, the spiral will be reversed and normal recording and reproduction will not be possible. Therefore, the surface detection mark 2 provided on the cartridge 2
a is detected by the surface detector 9, and when the lower surface of the B side lb of the disk l is on the lower side, by controlling the polarity switching circuit 7 and rotating the disk motor 4 in the counterclockwise direction,
This makes it possible to perform recording and reproduction on both sides continuously or in parallel without worrying about the mounting direction of the disc I from the user's perspective.

Such a device is illustrated in Japanese Patent Publication No. 1-302574.

Problems to be Solved by the Invention However, with the above configuration, it is necessary to prepare the disk 1 having two types of spirals in different directions, and the equipment for manufacturing and managing the disk master becomes complicated.
In addition, there is a possibility that mistakes may occur during the bonding process, and furthermore, the mounting direction to the cartridge 2, which is a storage case, must be constant, resulting in a lack of productivity and an increase in costs.

Means for Solving rRB In order to solve the above problems, the double-sided recording and reproducing apparatus of the present invention reverses the playback start position of the double-sided disc on the A side and the B side, and detects the loading direction of the disc. The optical head is equipped with a means for switching the rotation direction of the optical head so that the standby position of the optical head is at a position suitable for the A side and the B side.

Furthermore, it is provided with a means for synthesizing the signals recorded in the corresponding tracks from the start position of side A and side B, as necessary.

Effect of the present invention With the above-described configuration, it is possible to use discs manufactured from recording master discs with side A and side 8 together by bonding them together.
After solving the problems in disc manufacturing, we took advantage of the fact that the spiral directions of the tracks on sides A and B are opposite when viewed from the rotation of the disc, and when side A is recorded and played from the inner circumference, side 8 is By recording and reproducing the outer circumference, continuity of the track in the spiral direction with respect to the disk rotation is ensured, and A
It is possible to provide a double-sided recording and reproducing device capable of functions such as double-sided continuous recording and reproduction from side to B side, simultaneous reproduction, composite reproduction, and the like.

Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of a double-sided recording/reproducing apparatus according to a first embodiment of the present invention. In FIG. 1, the same components as in FIG. 8 of the conventional example are given the same numbers, and detailed explanations are omitted.

The difference from FIG. 8 is that this shows a case where there is only one optical head, and also shows an example where the disk l is not housed in a cartridge or the like.

In FIG. 1, 1 is a disk, and one disk is constructed by pasting together two disk plates 1a and 1a' having spiral tracks in the same direction. 3 is a turntable, 4 is a disc motor, 5 is FC1
6 is a rotation control circuit, and 8 is a drive circuit.

10 is an optical head, 11 is a feed drive device such as a linear motor for the lower surface of the disk, 12 is its scanning axis, 14 is a feed drive device such as a linear motor for disk), and 15 is its scan axis; I7 is an optical head surface moving device,
This is for moving the optical head 10 from the solid line state on the 1ζ plane to the broken line state on the ``--plane.

Reference numeral 16 denotes a command circuit, which controls the operation of the rotation control circuit 6 (7) ONloFF of the disk motor 4 and the optical surface moving device 17, and controls the operation of the optical head I described above, although not shown.
ON'/OF l? of the focus control (focus) circuit and track following control (tracking) circuit that control O?
It outputs commands and instructs the operation of the entire device.

With the double-sided recording and reproducing device ζ configured as described above,
The operation will be explained below using FIGS. 1 and 2.

First, FIGS. 2(a), (b), and (e) schematically show the structure of the disk 1 described above. What is different from the conventional example shown in FIG. 9 is that the direction of the track spiral is
a, 1 a” and ζ are the same. This means that common discs (such as VLP)
However, the difference with general discs is the direction in which the signals are recorded.In 1a, the signals are recorded from the inner circumference to the outer circumference as shown by the arrow, whereas in
Point a' is a point recorded from the outer circumference to the inner circumference.

Further, in FIG. 2, the track spiral is shown in a clockwise direction when viewed from the surface of the disk l, but two disks having a track spiral in a counterclockwise direction may be bonded together. In that case, the basic direction of rotation of the disk should be
Next, the operation of the above embodiment will be explained.

In Figure 1, disk l is disk motor 4, FG5
, the rotation control circuit 6, and the drive circuit 8 control the rotation extremely stably, which is the same as in the conventional example.

In the apparatus of this embodiment, the condition is that the A side is the lower surface, and the optical head IO is mounted on the linear motor 11 at t6, and the optical head IO is mounted on the linear motor 11 at the same time as the disk 1.
The recording or reproducing operation is started with the direction of the arrow 11a set as the normal recording direction. When the recording/reproducing operation for the A side is completed, the optical head 1 () is moved by the optical head surface moving device 17 toward the 1-side 1a' side of the disk l, and is moved by the linear motor 14. After performing necessary servo pull-in operations such as focusing and tracking, the optical head 10 moves from the outermost periphery of the disk 1 to the inner IM in the direction of the arrow 14a as shown by the broken line. Perform playback operation. f-resi, random access operation,
This is not the case in a mode such as reverse feed IIf raw, such as in a device that handles video No. 18.

As described above, according to this embodiment, the optical head feeding mechanism is arranged on both sides of the disk, and the recording direction of the inner and outer circumferences of the disk is reversed on the A side and the 8th side, so that the track spiral direction can be doubled. Continuous recording and playback on both sides can be realized with a simple configuration without having to prepare different types of discs. Furthermore, when moving the optical head from side A to side 8, there is no need to reverse the rotation direction of the disk motor, so recording and playback of side A and 13 sides can be realized extremely quickly, such as starting and stopping ↑-. This makes it possible to suppress unnecessary vibration noise and increase in power consumption.

(!) In this embodiment, since it is necessary to keep the disk loading direction constant, it is necessary to adjust the direction of tracking at startup and by reading address signals recorded in advance on each track that indicate the position of the trunk. It is also effective to display to the user the need to reverse the mounting direction.Also, by using a similar detection method, a motor polarity switching circuit as shown in the conventional example can be introduced to automatically change the rotation direction. It is also possible to reverse the rotation direction. However, in the case of reversing the rotation direction in this way, in the apparatus shown in FIG.
By reproducing from the inner circumference of the upper surface to the outer circumference and from the outer circumference of the lower surface to the inner circumference, the above-described continuous recording and reproduction can be realized.

Note that depending on the basic specifications of the device, recording and playback may be performed from the outer circumference to the inner circumference. In such a specification, recording and playback is first performed from the outer circumference to the inner circumference on side A, and then on side B.
The surfaces are set to record and reproduce from the inner circumference to the outer circumference.

A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a block diagram showing a second embodiment of the invention.

The components of this embodiment are basically the same as that of the conventional example shown in FIG. 8, except that disks with the same track spiral directions 1a (side A) and la' (side B) are pasted together. are essentially the same.

What is different from FIG. 1 is that the optical head 13 is also arranged for eight surfaces, and the surface of the cartridge 2 is detected by a surface detector 9 using a microswitch or the like, which is supplied to the rotational polarity switching circuit 7, The point is that the disk rotation direction at startup is changed depending on the mounting direction of the disk.

Therefore, at least one optical head 1O113 is arranged for each of the A side 1a and the B side la',
The configuration is such that these two optical heads can be used simultaneously at all times. However, each optical head 10.1
3, the standby position at the time of startup is different between the A side and the B side. As shown in FIG. The optical head 13 waits at the outer circumference, and after the operation of the optical head 10 is completed, the recording/reproducing operation is performed from the outer circumference toward the inner circumference. In addition, when the A side is mounted on the top side, the output of the surface detector 9 is supplied to the rotation polarity switching circuit 7, and the rotation of the disk is switched counterclockwise (if the track spiral is clockwise when viewed from the disk surface). ), further, the optical head 13 is placed on standby at the innermost circumference, and the optical head 10 is placed on standby at the outermost circumference.

When recording and reproducing continuously, the optical head 13 is operated first, and after the operation of the A side is completed, the optical head 10 starts operating from the outermost periphery of the B side.

An example of the external shape of a disk cartridge used in such an apparatus is shown in FIGS. 4(a) and 4(b).

(a) is a plan view, and (b) is a side view.

The cartridge 2 houses a disk l shown by a broken line, and as shown in FIG.
Discs with the same track spiral direction are bonded together on the B side. 2a is a surface detection mark; A
This is to detect which direction the surface is attached. 2c is a shutter, which closes in the direction of the arrow shown by 2d when the optical disc is installed in the device so that recording and reproduction can be performed. When the shell 20 is removed from the apparatus, it is in a closed state to protect the disk 1 from dust and scratches.

In the example of FIG. 4, the surface detection mark mentioned above is
If a hole as shown in 2a is provided on one side of the leading side to be inserted into the device, and the lever of the surface detector 9 is not pressed,
You can see that side A is facing down. Such surface detection marks can also be placed on the bottom, top, or side surfaces of the cartridge 2. In addition, instead of using holes as in this example, it is also possible to paste tapes with different reflectances and perform detection using a photocoupler or the like. , arrangement etc. does not matter.

As described above, in an apparatus for recording and reproducing a disk l housed in a cartridge 2 having a surface detection mark, the optical heads 10 and 13 corresponding to both surfaces are independently provided, and the rotation direction is determined by the output of the surface detector 9. At the same time, the start positions of the rads 10 and 13 in the radial direction of the A-side and B-side lights are set to opposite positions, and the start standby positions of both the optical heads 10 and 13 are set by the output of the surface detector 9. With this configuration, it is possible to realize continuous recording and reproduction on both sides with an in-cylinder configuration without having to prepare disks with two types of track spiral directions. Furthermore, an optical head 1O11:3 corresponding to both sides ζ is provided. 2. As shown in Figure 1, there is a light beam from surface A to surface 13.
Continuous reboiling on both sides without waiting time when moving the pot 1. It is something that can be realized in an extremely heartwarming manner in winter. Furthermore, by using the surface detection mark of the cartridge 2 as described above, it is possible to provide an apparatus in which there is no need to be aware of the insertion direction of the disk.

Next, the third embodiment will be explained using FIG. 5.

The difference between FIG. 5 and FIG. 33 is that the cartridge 2 is equipped with a groove direction detector 1 for detecting a groove direction mark 2e indicating the spiral direction of the disk 1. As a result, the rotational direction of the disk motor 4 and the standby position of the optical head are determined by the polarity synthesis circuit 19 which combines the output of the surface detector f1 described above.
It is possible to automatically determine the insertion direction of the disc 1 and the track spiral direction of the disc 1, thereby realizing continuous recording and reproduction as shown in the example of FIG.

Next, a fourth embodiment will be described using FIG. 6.

The configuration of the optical head and disk motor is the same as in Figure 3. 20.21 is the optical spatula F.
This is a demodulation circuit that supports 10.1:3. No.31 1
, not shown in Figure 5), but originally Ryo9 head 1
Is the output ζ of 0.1×3 different from each other? ? , f circuit is connected to the fi':A circuit, which performs signal processing opposite to the modulation during recording, and outputs the signal recorded on the disc in a form that can be used externally. On the other hand, the embodiment shown in FIG. 6 has independent 1M tone circuits 20 and 21, and these output signals are further outputted to external terminal 0 via a signal synthesis circuit 22 that synthesizes them.

By using both sides of the light simultaneously and combining them, it is possible to generate a wideband signal on a single disc, which was not possible with a single independent light beam in the 1st century. It can record and play back video signals, including recording and playing back high-resolution signals, combining two-screen video signals, 1. It is possible to combine screen video IL number and compressed long audio, etc.
Furthermore, in the case of digital data recording (I), it is possible to shift the signal so that it is possible to record and reproduce a high-transfer one-note signal. Examples of the recording format of discs on which such recording is performed are shown in section 7 ('i'fl (a,), (b), (c
). In the same figure, mal-1a” 1 and
Correlated signals such as 1a2-1a'2 are recorded on both sides of the disk.

Furthermore, in the case of an embodiment such as No. 2.3.4 in which optical heads are provided on both sides, in addition to continuous playback and composite playback,
It is also possible to use it completely independently, and one H
By providing two human outputs in B, it is possible to double the storage capacity of a network terminal with frequent input/output at once, and to output two completely independent video signals without specifying the position of each optical head. It is also possible to output the information to the screen.

In addition, in the figure, the optical heads on both sides are arranged in the same radial direction ζ so that they face each other, but the respective positions are 90",
By arranging it in the A device shifted by 180°, it can be fully utilized for devices that require an external magnetic field in opposition to the optical head, such as magneto-optical recording and reproducing devices. be.

Furthermore, in the embodiment 714 below, a device capable of recording and reproducing (
I have explained this in detail, but m such as V L [') etc.
For the main unit, we can similarly change the playback surface by changing the specifications and creating a disc with an inner start on the λ∆ surface and an outer start on the 8th surface.Thus, the direction of rotation of the disk motor can be reversed. It goes without saying that it is possible to perform rapid continuous playback without having to do anything. Therefore, in this specification, recording and reproducing include the case of reproducing Gj.

As can be seen from the effects of the invention, the double-sided recording and reproducing apparatus of the present invention utilizes a disk-shaped recording medium in which two recording disks having track spirals in the same direction are bonded together to form a first side and a second side. Since recording and playback are performed with the starting positions of the inner and outer peripheries of the first and second sides reversed, there is no need to prepare discs with two types of spirals in different directions, and the equipment for manufacturing and managing the master disc can be saved. It is simple, and there is no possibility of mistakes occurring during the bonding process.

In addition, by combining the signals recorded in the corresponding tracks from the start position of side A and side 8 as necessary, it is possible to
Functions such as composite playback, which were considered difficult to perform with a single disk, become possible, and recording and playback of broadband images and recording and playback of digital data at high transfer rates are realized using component parts at the current technological level. It is something that can be done.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a double-sided recording/reproducing apparatus according to a first embodiment of the present invention, FIG. 2 is a structural diagram of a disk used in the same embodiment, and FIG. 3 is a block diagram of a double-sided recording/reproducing apparatus according to a second embodiment of the present invention. A block diagram of a recording/reproducing device; FIG. 4 is a diagram showing the external shape of a disk cartridge in a second embodiment of the present invention;
FIG. 5 is a block diagram of a double-sided recording and reproducing apparatus according to a third embodiment of the present invention, FIG. 6 is a block diagram of a double-sided recording and reproducing apparatus according to a fourth embodiment of the present invention, and FIG. 7 is a block diagram of a double-sided recording and reproducing apparatus according to a fourth embodiment of the present invention. FIG. 8 is a block diagram of a conventional double-sided recording and reproducing apparatus, and FIG. 9 is a diagram showing the structure of a disk used in the conventional example. laS Ia'...first and second sides, l...disk (disk-shaped recording medium), 2...cartridge, 3...
・Turntable, 4... Disc motor, 5...
Frequency detector, 6... Rotation control circuit, 7... Polarity switching circuit, 8... Drive circuit, 9... Surface detector, l
O...A-plane optical head, 11.14...Linear motor (feed drive device), 12...Scanning axis, 13...8
Planar optical head, 15... Scanning axis, 16... Command device, 17... Optical head surface moving device, 18... Groove direction detector, 19... Polarity synthesis circuit, 20.21... - Demodulation circuit, 22... signal synthesis circuit. Agent Patent Attorney Matsu 1) Tadashi Michi Figure 1 Figure 7 Oniishi a Toad! 7J') %9 circuit diagram diagram diagram 2 cart 1 notsuzu/ (b) mouth■dingding■what diagram/7 prayer-samaro 9 times S diagram

Claims (7)

[Claims] (1) A disk motor that rotates a double-sided recordable and reproducible disk-shaped recording medium in which two recording disks having track spirals in the same direction are bonded together to form a first side and a second side; An optical head for recording and reproducing signals on a recording medium, and a feed drive device for driving the optical head in a radial direction of the disc-shaped recording medium, the optical head moving from an inner circumference to an outer circumference or from an outer circumference to an inner circumference. In this case, the double-sided recording/reproducing device is characterized in that the movement direction is opposite between the movement on the first side and the movement on the second side. (2) The disc-shaped recording medium is housed in a cartridge equipped with a surface detection mark for distinguishing between the first surface and the second surface, and the surface detection mark is detected and the first surface is detected by the device. a surface detector for detecting the direction in which the disc motor is mounted, and a rotational polarity switching means for switching the rotational direction of the disk motor, and by supplying the output of the surface detector to the rotational polarity switching means when the device is started. 2. The double-sided recording/reproducing apparatus according to claim 1, wherein the rotational direction of the disk motor is switched in accordance with the rotational direction, and the optical head is made to stand by at a starting position of the first side. (3) At least one optical head is provided corresponding to the first surface and the second surface, and when the device is started, the optical head standby positions of the first surface and the second surface are set to opposite positions in the radial direction. The double-sided recording/reproducing apparatus according to claim 1 or 2, wherein the double-sided recording/reproducing apparatus is put on standby. (4) The disc-shaped recording medium is housed in a cartridge equipped with a groove direction mark indicating the track spiral direction, and includes a groove direction detector mounted on the apparatus for detecting the groove direction mark, and a surface detector. 4. A combination means for combining an output of the groove direction detector and an output of the groove direction detector, and the rotation polarity switching means is controlled by the output of the combination means when the apparatus is started up. Double-sided recording/playback device. (5) It is characterized by having a reproduced signal synthesizing means for synthesizing the signals recorded on the respective tracks corresponding to the starting positions with the inner and outer peripheral positions of the first side and the second side reversed and reproducing them as one signal. The double-sided recording and reproducing apparatus according to claim 1, 2, 3, or 4. (6) A recording medium characterized in that the inner and outer periphery positions at which recording and reproduction start on the first side and the second side are reversed. (7) A signal is recorded and reproduced by which the signals recorded on the corresponding tracks can be synthesized from a start position with the inner and outer peripheral positions of the first side and the second side reversed. Recording medium described.