JPS63231730A - Optical recording disk reproducing device - Google Patents

Abstract

PURPOSE:To enable excellent special reproduction from even a disk which is recorded by a constant linear speed system by moving an optical beam through a kicking means after storing a bit of reproducing video information to a storage means, and then, storing the video information in the storage means after the disk is turned with the specified number of rotations. CONSTITUTION:When special reproduction is performed, a controller 21 stores a video signal reproduced from a high-speed and high-density recording disk 11 in a memory 16 and then changes over a switch 22 to the side of the memory 16. Consequently, a video output is sent out of the memory 16 without any discontinuance and the controller 21 while outputting the video output continuously controls a kick circuit 17 to move the optical beam in a track direction by the constant number of tracks. A servo circuit 15 controls the tracking of a pickup 12 to the track where the optical beam is moved until the specified number of rotations of the disk 11 are detected, and then stores the reproducing video signal to repeat similar operation. Consequently, special reproduction having no discontinuance is performed even from the disk which is recorded by the constant linear speed system.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to special playback such as slow playback and high-speed playback in an optical recording disc playback device.

BACKGROUND OF THE INVENTION In recent years, optical recording disks have become popular as compact disks, laser vision, etc. In particular, high-density recording disk playback devices that play back video and audio signals have been devised in a variety of applications as the cost of semiconductor memory has fallen. It is hoped that a possible optical recording disk reproducing device will be introduced into the market.

An example of the conventional optical recording disk reproducing apparatus described above will be described below with reference to the drawings.

FIG. 3 is a block diagram showing the configuration of a conventional optical recording disk reproducing apparatus. In the figure, 1 is a high-density recording disk, 2
3 is a pickup, 3 is a spindle 3A-S' motor, 4 is a video signal reproducing circuit, 5 is a servo circuit, 6 is an output terminal, 7 is a kick circuit, and 8 is an oscillator.

The reproducing operation and special reproducing operation of the conventional optical recording disk reproducing apparatus constructed as described above will be explained below.

A pickup 2 converts a video signal recorded on a high-density recording disk 1 into an electrical signal. The video signal reproducing circuit 4 functions to convert the electrical signal into a video signal. The reproduced video signal is output from the terminal 6. The servo circuit 5 functions to accurately irradiate the optical beam of the pickup 2 onto the signal track provided on the high-density recording disk 1.
The spindle motor 3 rotates the high-density recording disk 1 at a precise playback speed. When performing special playback, an oscillator 8 generates pulses at a constant cycle, and these pulses cause the kick circuit 7 to operate at a constant cycle. This is achieved by moving the optical beam in the track direction.

Problems to be Solved by the Invention However, originally, optical high-density recording disks (hereinafter simply referred to as disks) recorded data using the constant angular velocity (CAV) method and the constant linear velocity (CLV) method. With constant angular velocity disks, one revolution of the disk corresponds to one frame of the video signal, so even if special playback is performed with a conventional playback device, the output video signal will not be synchronized continuously. Since the rotational speed of the disc does not change between the inner and outer circumferences of the disc, the playback speed of special playback is also constant depending on the kick circuit's kink cycle, that is, the output cycle of the oscillator. One rotation does not correspond to one frame of the video signal, so when performing special playback with a conventional playback device, the synchronization of the output video signal will not be continuous and the playback screen will be distorted.Also, the number of revolutions of the disc will differ between the inner and outer circumferences of the disc. The playback speed of special playback also has the disadvantage that it does not vary constant depending on the kicking period of the kick circuit, that is, the output period of the oscillator.

Means for solving the problem In order to solve the above problem, proceed to optical recording method 5 of the present invention - A recording disc playback device converts recorded information into an electrical signal by irradiating the disc with an optical beam. A pickup, a servo device that moves the objective lens of the pickup to accurately irradiate an optical beam onto the tracks formed on the disk, a kicking device that moves the optical beam in the direction of the tracks by a certain number of tracks from the position where the optical beam is being reproduced, and the disk. a rotation detecting means for detecting that the pickup has rotated a certain number of times; a reproducing device for reproducing a video signal from the electric signal obtained by the pickup; and a storage means for storing the reproduced video information.
After instructing the storage means to store video information, the kicking means is instructed to move the optical beam in the track direction by a certain number of tracks from the position where it is being reproduced, and then the rotation detection means moves the optical recording disk by a certain number of tracks. The apparatus includes an instruction means that periodically causes the servo device to accurately irradiate the optical beam onto the tracks formed on the optical recording disk until rotation is detected.

According to the above-described configuration, the present invention stores the video information reproduced from the disc in the storage means, continuously outputs it as video output, and sends the optical beam to the kicking means for a certain number of tracks from the reproducing position. A disc that is recorded using a constant linear velocity method by periodically moving the disc in the track direction, rotating the disc a certain number of times, and storing the reproduced video information on the disc again in the storage means. Also, even when special playback is performed, the synchronization of the output video signal is continuous, and the playback speed can be kept constant.

EXAMPLE Hereinafter, an optical recording disk reproducing apparatus according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an optical recording disk reproducing apparatus according to an embodiment of the present invention. In the figure, 11 is a high-density recording disk, 12 is a pickup, 13 is a spindle motor, 14 is a video signal reproducing circuit, 15 is a servo circuit, 1
6 is a memory, 17 is a kick circuit, 18 is a slit disk,
19 is a photointerrupter, 20 is a counter, 21 is a control circuit, 7A, 22 is a switch, and 23 is a terminal.

The operation of the optical recording disk reproducing apparatus according to one embodiment of the present invention constructed as described above will be described below.

A pickup 12 converts a video signal recorded on a high-density recording disk 11 into an electrical signal. The video signal reproducing circuit 14 functions to convert the electrical signal into a video signal. The reproduced video signal is sent to the memory 16 and switch 22. The switch 22 is normally set on the video signal reproduction circuit side, and the video signal is output from the terminal 23.

The reproduced video signal is stored in the memory 16. The servo circuit 15 functions to accurately irradiate the optical beam of the pickup 12 onto the signal track provided on the high-density recording disk 11, and the spindle motor 13 rotates the high-density recording disk 11 to achieve an accurate reproduction speed. . The slit disk 18 is directly connected to the shaft of the spindle motor 13, and when the high-density recording disk 11 rotates, the slit blocks the light from the photoinkractor 19 and generates an electric pulse train.

By counting the number of pulses with the counter 20, it is possible to detect how many times the high-density recording disk 11 has rotated.

The control circuit 21 stores memory 1 in advance when performing special playback.
6 stores the video signal reproduced from the high-density recording disk 11, and sets the switch 22 to the memory side. Since the memory output continuously outputs one field of video information stored in the memory 16, it is itself continuous and there is no discontinuity in synchronization. Thereafter, the control circuit 21 moves the optical beam to the kick circuit 17 in the track direction by a certain number of tracks from the reproducing position while continuously outputting the memory output as a video output, and then controls the high-density recording disk 11 by the counter 2o. The pickup 12 is rotated by the servo circuit 15 until it is detected that the pickup 12 rotates a predetermined number of times.
The optical beam traces the track on the high-density recording disk 11, and then the video information reproduced from the high-density recording disk 11 is stored in the memory 16 periodically.

Figure 2 shows the operation 9A-part of the control circuit 21 when performing special playback. A flowchart showing the process is shown below.

At this time, the speed of special reproduction can be changed by changing the number of tracks to which the kick circuit 17 moves the optical beam at one time and the rotational speed of the high-density recording disk detected by the counter 20. For example, when performing special playback at a speed of % of normal playback, the kink circuit 17 moves the optical beam by one track in the opposite direction to the playback direction, and the counter 20 detects that the high-density recording disk 11 rotates twice. When performing special reproduction at twice the speed of normal reproduction, the kick circuit 17 moves the optical beam in the reproduction direction by one track, and the counter 20 rotates the high-density recording disk 11 once. All you have to do is let it be detected. Also,
By setting the number of tracks on which the kick circuit 17 moves the optical beam in the direction opposite to reproduction to be greater than the number of revolutions counted by the counter 2o, special reproduction in the direction opposite to reproduction is also possible.

As described above, one embodiment of the present invention includes a pickup, a spindle motor, a video signal reproducing circuit, a servo circuit, a memory, a kick circuit, a 1Q'' slit disk, a photointerrupter, a counter,
By providing a control circuit, a switch, and a terminal, the synchronization of the output video signal is continuous even when special playback is performed, even on discs recorded using the constant linear velocity method, and the playback speed can also be kept constant. It becomes possible.

Note that the counter and control circuit shown in this embodiment can also be realized by a microcomputer.

Effects of the Invention As described above, the optical recording disk reproducing apparatus of the present invention includes a pickup that irradiates an optical recording disk with an optical beam to convert recorded information into an electric signal, and a pickup that moves the objective lens of the pickup. A servo device that accurately irradiates an optical beam onto the tracks formed on the optical recording disk, a kicking device that moves the optical beam in the track direction by a certain number of tracks from the position where it is being reproduced, and a certain number of optical recording disks. Image signal 11 is generated from the rotation detection means that detects rotation and the electric signal obtained by Pisoqua 7°.
- a reproducing device for reproducing the video information, a storage means for storing the reproduced video information, and after instructing the storage means to store the video information, the optical beam is directed to the kicking means for reproducing a predetermined number of tracks from the position where the optical beam is being regenerated. After that, the servo device is instructed to move the optical recording disk in a certain direction until the rotation detecting means detects that the optical recording disk has rotated a certain number of times. By providing an instruction means to perform the operation periodically, the video information reproduced from the disc is stored in the storage means, and the optical beam is regenerated from the position to the kicking means while continuously outputting it as video output. Records at a constant linear velocity by periodically performing operations such as moving the disk in the track direction by a certain number of tracks, then rotating the disk a certain number of times, and then storing the video information reproduced from the disk in the storage means again. Even on discs that have been processed, the synchronization of the output video signal will be continuous even when special playback is performed.
It is also possible to keep the playback speed constant.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an optical recording disc playback device according to an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of the control circuit when performing special playback of the same device, and FIG. 3 is a conventional one. 1 is a block diagram showing the configuration of an optical recording disk reproducing apparatus of FIG. 11...High-density recording disk, 12...Pickup, 13. River...Spindle motor, 14...
...Video signal reproduction circuit, 15... Servo circuit, 16... Memory, 17... Kick circuit, 18... Slit disk, 19.・・・・・・
・Photo interrupter, 2o... Counter, 2
1...Control circuit, 22...Switch,
23...Terminal.

Claims (1)

[Claims] A pickup that irradiates the optical recording disk with an optical beam and converts the recorded information into an electrical signal; a servo device that moves the objective lens of the pickup to accurately irradiate the optical beam onto the tracks formed on the optical recording disk; kicking means for moving the optical beam in the track direction by a predetermined number of tracks from the reproducing position; rotation detection means for detecting that the optical recording disk has rotated by a predetermined number of times; a reproducing device for reproducing the signal; a storage means for storing the reproduced video information; and after instructing the storage means to store the video information, the optical beam is directed to the kicking means in a track direction by a predetermined number of tracks from the position where the optical beam is being reproduced. the servo device to accurately irradiate the optical beam onto the tracks formed on the optical recording disk until the rotation detecting means detects that the optical recording disk has rotated a certain number of times. What is claimed is: 1. An optical recording disk reproducing device characterized by comprising an instruction means for periodically performing an operation of