JPH02265075A - Information recording disk - Google Patents

Abstract

PURPOSE:To shorten the access speed by recording vortically a signal in the reverse rotational direction on a first face and a second face, and executing reproducing without varying the rotation at the time of continuously reproducing and accessing extending over both the faces. CONSTITUTION:On the A face of an optical disk 21, a signal is recorded vortically from the inside periphery to the outside periphery, and on the B face, it is recorded vortically in a reverse turn from the outside periphery to the inside periphery. First of all, an optical pickup moving device 24 moves an optical pickup 23 to the innermost periphery of the A face of the disk 21, and simultaneously, rotates the disk 21 in the prescribed direction. As a result, the pickup 23 reads the signal from the A face and starts the reproduction. In such a case, on the A face, since a track moves to the outside periphery, the moving device 24 moves the pickup 23 to the outside periphery of the disk 21. When it reaches the outermost periphery of the A face, the pickup 23 moves to the inside periphery of the B face, and starts the reproduction of the B face. In such a way, since both the faces can be reproduced continuously without varying the rotation of the disk 21, the access speed can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides information recording areas on both sides of a disc, such as a laser vision disc (hereinafter referred to as LVD).
Moreover, it mainly relates to an information recording disk for simultaneously recording and playing back moving images and music.

2. Description of the Related Art In recent years, information recording disks, typified by LVDs, have been widely used as recording media for recording and reproducing movies, music, etc. over long periods of time.

Hereinafter, an LVD as an example of the above-mentioned conventional information recording disk and a reproducing apparatus for reproducing the same will be explained with reference to FIGS. 5 and 6.

FIGS. 5(a) and 5(b) are plan views schematically showing the state of the signal tracks on the A side and the 8th side of the LVD, respectively, viewed from the signal reading surface, and 51 is a plan view showing the state of the signal track where the signal is recorded. It is a spiral track. The recorded signal is a frequency-divided signal obtained by FM modulating a composite video signal and a digital data string, and the signal is recorded in the same spiral shape from the inner circumference to the outer circumference on both sides A and B.

In this method, a single LVD having recording surfaces on both sides is created by bonding the protective film surfaces of two similarly created single-sided discs together. (Keigakuda version "Introduction to Laser Vision Discs") Figure 6 shows a system block diagram of a conventional laser vision player that can automatically play both sides. 61 is the LvDl shown in Figure 5. 62 is rotating the LVDe1. 63 is an optical pickup for reading signals recorded on the disk; 64 is an optical pickup moving device for moving the optical pickup along a U-shaped rail for double-sided reproduction; 65 is an optical pickup moving device for moving the optical pickup along a U-shaped rail for double-sided reproduction; L
A servo circuit that controls the rotation of the VDe 1 and the drive mechanism of the optical system, 66 a signal demodulation circuit that returns the modulated signal read from the LVDe 1 to the original video signal and audio signal, and 67 an operation that controls the operation of the function. It is a control circuit.

The operation when an LVD, which is a conventional information recording disk configured as described above, is played back by a double-sided playback laser vision player shown in FIG. 6 will be described.

When double-sided continuous playback is instructed by the operation control circuit 67, the optical pickup moving device e4 first moves the optical pickup 63.
While moving to the innermost circumference of side A of LVDE31,
The disk drive device 62 rotates the LVDe1 at a predetermined speed. When the rotational speed reaches a predetermined state, the optical pickup 63 reads the signal on side A and starts reproduction.

Thereafter, the optical pickup 63 is gradually moved from the inner circumference to the outer circumference of the disc by the optical pickup drive device 64 while continuing playback. When the reproduction of side A is completed, the optical pickup drive device 64 moves to the curved part of the rail. The optical pickup 63 is moved along the line to the innermost circumference of the eight sides of the LVD f31. At the same time, the disk drive device 62 temporarily stops the rotation of the LVDe1, then rotates it in the opposite direction, and when the rotation speed reaches a steady state, the optical pickup 63 reads the signal of the 8th side again and starts playing the 8th side. .

Problems to be Solved by the Invention However, in the information recording disk configured as described above,
When playing back on a playback device capable of double-sided playback, for example, if you want to continue playing side 8 from side A, or access across sides A and 8, you must first stop the rotation of the disk drive and change the direction of rotation. What was being done to solve the problem that the waiting time required for access was extremely long because the signal could not be read unless the device was switched and rotated until it reached steady rotation.

In view of the above, the present invention enables continuous playback across both sides or access across both sides without changing the rotational direction of the disc, making it possible to dramatically shorten the access speed. The purpose is to provide information recording discs.

Means for Solving the Problems In order to solve the above problems, an information recording disk according to claim 1 of the present invention has a first surface on which signals are recorded in a spiral shape from the inner circumference toward the outer circumference, and a second surface on which signals are recorded in a spiral shape from the inner circumference to the outer circumference. The signal is recorded in a spiral shape from the inner circumference to the outer circumference in a rotation direction opposite to that of the first surface.

Further, in the information recording disk according to claim 2, the first surface records the signal in a spiral shape from the inner circumference to the outer circumference, and the second surface records the signal in a spiral manner from the outer circumference to the inner circumference. It is characterized by recording signals in a spiral shape in different directions.

Function: According to claim 1 of the present invention, the above-mentioned configuration allows the regeneration to occur in the first place.
Even after the reproduction of the second side is completed, the second side is reproduced while the rotational direction of the disc is maintained. Furthermore, in the second aspect, there is no need to change the rotational direction and rotational speed of the disk when moving from the first side to the second side.

Embodiment FIGS. 1(a) and 1(b) are plan views schematically showing the state of signal tracks when an optical disc, which is an example of the information recording disc according to claim 1 of the present invention, is viewed from the signal reading surface. be. Figure 1 (a) shows that the signal is recorded in a clockwise spiral from the inner circumference to the outer circumference on the first plane, and Figure 1 (b) shows that the signal is recorded on the second plane. is recorded in a spiral shape counterclockwise from the inner circumference to the outer circumference.

2 shows a playback device that is almost the same as the playback device shown in FIG. 6 that plays back the optical disk shown in FIG. 1, 21 is the optical disk shown in FIG. 24 is an optical pickup moving device, 25 is a servo circuit, 26 is a signal demodulation circuit, and 27 is an operation control circuit.

The operation of the optical disc and optical disc reproducing apparatus of this embodiment constructed as described above will be described below with reference to FIGS. 1 and 2.

First, the optical pickup moving device 24 moves the optical pickup 23 to the innermost circumference of the A side of the optical disc 21 in order to reproduce the A side of the optical disc 21 . At the same time, the disk drive device 22 rotates the optical disk 21 in a predetermined direction at a predetermined rotational speed. After that, the optical pickup 23 reads the signal from side A of the optical disc 21 and starts reproduction. Since the track progresses from the inner circumference to the outer circumference on the A side, the optical pickup moving device 24 gradually moves the optical pickup 23 to the outer circumference of the optical disc 21 along the rail. When the reproduction of the A side is completed, the optical pickup 23 is moved along the curved part of the rail to the inner circumference of the 8th side of the optical disc, and reproduction of the 8th side is started.

As described above, according to this embodiment, signals to be recorded on the optical disc are recorded in a spiral shape from the inner circumference to the outer circumference on the A side, and in a spiral shape opposite to the A side from the inner circumference to the outer circumference on the 8th side. If the signals are recorded so that the optical disc rotates on both sides, it is possible to play back both sides without changing the direction of rotation of the optical disc, and the waiting time that occurs when shifting playback from side A to side 8 or from side 8 to side A can be avoided. can be shortened.

Hereinafter, an information recording disk of a second embodiment embodying the invention of claim 2 of the present application will be described with reference to the drawings.

FIG. 3 is a diagram showing the recording surface of the information recording disk according to claim 2 of the present invention. Figure 3 (a) shows that the signal is recorded clockwise from the inner circumference to the outer circumference on side A, and Fig. 3 (b) shows that the signal is recorded clockwise from the outer circumference to the inner circumference on side 8. This indicates that the data is recorded counterclockwise.

The operation will be explained below using FIGS. 3 and 4.

FIG. 4 is a block diagram of a double-sided automatic playback player having a dedicated pickup for each side. In the figure, information on side A of an optical disc 41 is read out by a pickup 43a driven by an optical pickup moving device 44a, and its output is given to a signal demodulation circuit 4t3a.

Further, the information on the eight surfaces is read out by a pickup 43b driven by an optical pickup 44b, and its output is given to a signal demodulation circuit 48b. The disk drive is operated by switching the output from each servo circuit 45a or 45b, and the demodulated signal is outputted to the outside as a video output.

Next, the operation of this embodiment will be explained.

First, the optical pickup moving device 44A moves the optical disc 41
In order to reproduce side A of the optical disc 41, the optical pickup 43A is moved to the innermost circumference of side A of the optical disc 41. At the same time, the disk drive device 42 rotates the optical disk 41 in a predetermined direction at a predetermined rotational speed. After that, the optical pickup 43A plays back side A of the optical disc 41, but
Since the track progresses from the inner circumference to the outer circumference on the A side, the optical pickup moving device 44A moves the optical pickup 43A from the inner circumference to the outer circumference. When side A finishes playing, 8
The optical pickup 43B for surface reproduction continues to reproduce the 8th surface, but since the signal is recorded on the 8th surface from the outer periphery to the inner periphery in a heat-circulating manner with respect to the A surface, the optical pickup 43B reproduces from the outer periphery of the 8th surface. As the playback progresses,
It is gradually moved to the inner circumference of the optical disc 41.

As described above, according to this embodiment, signals to be recorded on the optical disc are recorded in a spiral shape from the inner circumference to the outer circumference on the A side, and in a spiral shape opposite to the A side from the inner circumference to the outer circumference on the 8th side. If you record signals so that
The waiting time that occurs when the playback is shifted from side 8 to side A can be reduced.

In addition, the end point of side A and the start point of side 8 are both located near the outer periphery of the optical disc, and can be set at approximately the same distance from the center, so even if the optical disc is recorded at constant linear velocity (CLV). , the signal can be reproduced without changing the rotational speed of the optical disc. Furthermore, even when playing back both sides of an optical disc using the second playback device, since the moving distance of the optical pickup is the shortest, it is possible to continuously play back both sides of the optical disc with almost no waiting time.

As described in detail, according to claims 1 and 2 of the present invention, there is no need to change the direction of rotation of the disc even when the reproduction moves from the first surface to the second surface of the information recording disc. Therefore, fast double-sided access can be enabled.

According to claim 2 of the present invention, when the second side of an LVD-recorded information recording disc is played back from the first side, the end portion of the first side and the second side are Since the starting portion can be set at approximately the same distance from the center of the disc, this has great practical effects, such as the ability to smoothly transition playback from the first side to the second side without changing the rotational speed.

[Brief explanation of drawings]

FIGS. 1(a) and 1(b) are plan views schematically showing the state of signal tracks as viewed from each recording surface of an optical disc as an embodiment of the information recording disc according to claim 1 of the present invention;
Figure 2 is a block diagram of a dual-purpose automatic playback laser vision player, Figures 3 (a) and (b) are schematic diagrams of the signal recording surface of a laser vision disc, and Figure 4 is a block diagram of a conventional double-sided automatic playback laser vision player. 5(a) and 5(b) are schematic diagrams of the signal recording surface of a conventional laser vision disc, and FIG. 6 is a block diagram of a conventional double-sided automatic playback laser vision player. 1... Optical disc, 2... Spiral track, 2
DESCRIPTION OF SYMBOLS 1... Optical disc, 22... Disk drive device, 23... Optical pickup, 24... Optical pickup moving device, 25... Servo circuit,
26... Signal demodulation circuit, 27... Operation control circuit, 41... Optical disc, 42... Disc drive device, 43A. 43B...Optical pickup, 44A, 44B.
・・Optical pickup moving device, 45A, 45B・
...Servo circuit, 46A, 46B...Signal demodulation circuit.

Claims (2)

[Claims] (1) The first surface records signals in a spiral pattern from the inner circumference to the outer circumference, and the second surface records signals in a spiral pattern from the inner circumference to the outer circumference in the opposite direction of rotation to the first surface. An information recording disc characterized by recording information. (2) The first surface records signals in a spiral pattern from the inner circumference to the outer circumference, and the second surface records signals in a spiral pattern from the outer circumference to the inner circumference in the same rotational direction as the first surface. An information recording disc characterized by: