JPS59113573A - Optical disc driving device - Google Patents

Abstract

PURPOSE:To recognize always the rotation position of an optical disc, by providing a rotation position detecting mechanism, a mechanism which reads out sector numbers recorded beforehand on the optical disc, and a synchronizing mechanism on a revolving shaft mechanism which rotates the optical disc. CONSTITUTION:A rotation position detecting disc 3 is provided with rotation position detecting marks at intervals of a short length, and marks are detected by a rotation position detecting sensor 5. A recording and reproducing optical head 8 reads out sectors of each track on the optical disc which is positioned on the optical disc by an access motor 12. A synchronizing mechanism 9 receives an instruction from a control circuit 10 to specify one of position signal pulses which are attained from a rotation position detecting sensor amplifier 6 by a signal indicating that a specific sector number is detected; and hereafter, when the synchronizing mechanism 9 counts the number of pulses corresponding to one rotation of the optical disc, it judges that the optical disc is returned to the original position, and it generates a pulse signal. An access control circuit 11 adjusts the number of access pitches to drive the access motor 12 and moves the recording and reproducing head 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical disk drive, and more particularly to an original disk drive that synchronizes the rotational positions of optical disks.

In a conventionally known optical video tape readout device, the rotational position of the video disc can be recognized based on the vertical synchronization signal of the read video signal 1. For example, if you want to obtain a still image, you can use the RC Immediately after receiving the vertical synchronization signal after reproducing one round of the target track, the operation is repeated such that after one pitch, the target track is regenerated for one round.

By the way, this optical videotiff readout device does not require very high-speed access, so if you want to access one round of the target track, it may be difficult to achieve the objective.
A method is used in which the previous track is accessed and moved as the video disc rotates, eventually reaching one revolution of the target track. Therefore, the signal indicating the rotational position of a video disc is not particularly useful except for obtaining still images.

Optical tisf drive devices used for information processing applications require fast access, so it is necessary to directly position the target track for one round. When the number of jumps reaches the previously determined number of pitches VC, you can stop the jump and reach VC↓. The problem at this time is that since the track has a spiral VCZ, the position of the target address may shift due to the rotation VC of the optical disk during access, and the location where the access ends may be different from the location of the target address. It is.

A possible method for preventing this is to detect the rotational position at which the trunk address of the optical disk changes and adjust the number of jumps. However, since it goes off track while jumping to the head, it is not possible to read the sector number and find out the rotational position of the optical disk. Also, is there a mark on the two optical discs to know the rotational position? Since marking must be done while reading the sector number recorded in advance, a special device is required for this purpose.The purpose of the present invention is to detect the rotational position of an optical disc having a spiral track. It is an object of the present invention to provide an optical tisf drive device that does the following.

Another object of the present invention is to provide an optical disk drive device that synchronizes the rotational position of an optical disk having a spiral track with sector information from an optical head.

According to the present invention, an optical disk having a spiral recording/reproducing track in which a unique track number for each track cycle is recorded in advance and a plurality of sector numbers are recorded in advance for each track is used to perform recording/reproducing. This is an optical disk device that performs reproduction, and includes a rotating shaft mechanism coupled to an optical disk rotating motor that rotates the optical disk, and a rotational position detection device 1 that detects the rotational angular position of the rotating shaft mechanism VC.
a rotational angular position obtained from a disk mechanism, a mechanism for reading sector numbers of the original disk, and a mechanism for detecting one rotational angular position;
There is obtained an optical disk drive device characterized in that it has a synchronization mechanism that specifies the relationship with the sector position on the optical disc.

The present invention has a spiral recording/reproducing track.

- An optical disk device using an original disk in which a unique track number is recorded on each track of a rotary valve, each track is divided into a plurality of sectors, and a unique sector number is recorded in advance in each sector. , a rotating shaft mechanism that rotates the original disk, a rotational position detection mechanism,
It consists of a synchronization mechanism that specifies the sector information of the original disk and the rotational position of the rotating shaft mechanism.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a portion of the optical disk device related to an optical disk drive device. In FIG. 1, this embodiment shows a rotating shaft mechanism 2 connected to an optical disk.

A rotary position detection sensor 3 and an optical disk rotation motor 4 attached to the rotary shaft mechanism 2, a rotational position detection sensor 5 installed slightly apart from the rotational position detection sensor 3, and The connected rotational position detection sensor amplifier 6, the recording/reproducing optical head 8 installed slightly away from the optical disk, and the optical head 8 connected thereto.
an access motor 12 that drives in the kA direction (arrow) vc;
an access control circuit 11 connected to the access motor 12vc; a synchronization mechanism 9 that operates from the output signal vc of the rotational position detection sensor amplifier and the rotational position detection sensor amplifier 1 to control the access control circuit 11; It includes a control circuit 10 that controls the circuits and each mechanism.

The optical disk 1 has a spiral recording/reproducing track, and a unique track number for each track and a plurality of sector numbers for each track are recorded in advance, and F recording/reproduction is performed on the optical head. It is a medium.

The optical disk rotation motor 4&C is rotated by 9 times through the rotation shaft mechanism 2 together with the optical disk 3 for detecting rotational position of 1μ. The mark is detected by the rotational position detection sensor 5. This detected signal is amplified and shaped into a pulse by the rotational position detection sensor amplifier 6. The recording/reproducing source head 8 reads sectors of each track on the optical disk positioned on the optical disk by the access motor 12I/c. This sector signal is amplified and shaped by the sector read circuit 7. A signal is generated when the number of sector information read out by the sector read circuit 7 reaches a specific value set in advance. The synchronization mechanism 9 receives a command from the control circuit IO, and adds cf) one of the position signal pulses obtained from the rotational position detection sensor amplifier 6 to the signal indicating that the specific sector number has been detected.
After that, if the number of pulses corresponding to one revolution of the optical disk is counted, it is assumed that the optical disk has returned to its original position and a pulse signal is generated.

This pulse signal is supplied to the access control circuit 11Vc. At the access control circuit 11.

Based on this signal, the access pitch is adjusted during the f-access, and the access motor 12 is driven to move the recording/reproducing head 8.

FIG. 2 shows in detail the circuit of the synchronization mechanism used in this embodiment. This synchronization mechanism 9 is a synchronization control circuit 2
1 and a subtraction counter 22. The synchronization start signal 23 and specific sector detection signal 24 are inputted from the control unit 10 to a synchronization control circuit including a subtraction counter 22, and a counter load signal 26 and a position signal of the synchronization control circuit are inputted to the subtraction counter 22. A pulse 28 is provided and configured to provide a counter zero signal 27 to the synchronization control circuit. The synchronization control circuit 21 receives the synchronization start signal 23 and prepares to receive the specific sector detection signal 24, and when the specific sector detection signal arrives, it sends a counter load signal 26 to the subtraction counter 22 and sends this signal to the air supply subtraction counter 22. Position signal pulse 2 generated when the optical disc 1 rotates once in response to the
Load the value corresponding to the number of pulses of 8 into the subtraction counter. The content of the subtraction counter is subtracted by the position signal pulse 28 and becomes zero when the optical disk rotates once. The subtraction counter sends a counter zero signal 27 to the synchronization control circuit when its content becomes zero. The synchronization control circuit sends a counter load signal to the subtraction counter again and repeats the same operation thereafter.

Note that the synchronization signal 25 is sent out at the same timing as the counter load signal.

As explained above, the present invention includes a rotational position detection mechanism in the rotary shaft mechanism for rotating an optical disk, and a mechanism for reading sector numbers recorded in advance on the original disk, and a specific relationship between these signals. By providing a synchronization mechanism for all settings, it is possible to recognize the rotational position of the original disk even if sectors are not constantly read.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an optical disk drive device of an optical disk device according to an embodiment of the present invention, and FIG. 2 is a diagram showing details of a synchronization mechanism. DESCRIPTION OF SYMBOLS 1... Optical disk, 2... Rotating shaft mechanism, 3... Disk for rotational position detection, 4... Original disk rotating motor. 5... Rotational position detection sensor, 6 Rotational position detection sensor amplifier, 7... Sector read circuit, 8... Recording/playback head, 9... Synchronization machine! , 10... control circuit, 2
1... Synchronization control circuit, 22... Subtraction counter. 23... Synchronization start signal, 24... Specific sector detection signal, 25... Synchronization signal, 26... Counter load signal. 27... Counter zero signal, 28... Position signal pulse.

Claims (1)

[Scope of Claims] Recording is performed using an optical disc having a spiral recording/reproducing track in which a unique track number for each track cycle is recorded in advance and a TK-41 number of sector numbers are recorded in advance for each track. . An optical disc device for reproducing, which comprises: a rotating shaft mechanism coupled to an optical disc rotation motor that rotates the optical disc; a rotational position detecting tisf mechanism for detecting a rotational angular position on the rotating shaft mechanism; and the original disc. and a synchronization mechanism that synchronizes when there is a specific relationship between the rotational angular position obtained from the one rotational angular position detection mechanism and the sector position on one optical disk. disk drive.