JPS59113574A - Optical disc driving device - Google Patents

Abstract

PURPOSE:To position an optical head surely, by providing a mechanism which moves the optical head in accordance with the number of pitches to be traversed, which is given from a control circuit, and controls the optical head so that jump is continued until the number of pitches becomes zero. CONSTITUTION:A track selecting mechanism 6 includes a down counter 11 to which the number of pitches to be traversed and based on an operation instruction from a control circuit 5 is set, a flip-flop 12 which receives an index signal from an index sense amplifer 4 and a jump clock, a D-type latch circuit 13 which holds the state of the flip-flop 12, an AND circuit 31, NAND circuits 32- 35, and an inverter 36. When the track selecting mechanism 6 receives an index signal 18 during the access of the optical head, the down counter is counted down without executing jump in case of the forward access, but jump is executed without counting down the down counter in case of the reverse access.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an original disk drive, and more particularly to an optical disk drive having a track selection mechanism.

In the conventionally known optical video tape readout device, since a very high speed of 2 times is not required, the optical video display moves to a track number p earlier than the target track number, moves as the optical display rotates, and eventually reaches the target track number. A method was used to reach the track number. Optical tisf devices used for information processing applications are required to have quick access, so it is necessary to directly position them to the target track number. The reason for this time order is that the tracks are in a spiral vc shape, so as the optical disk rotates, the position of the target track number shifts, and when the target track number has been moved by the number of pitches determined before access, the target track number is □ The purpose of the present invention is to eliminate this drawback of the conventional device and to use a spiral track in a 1ζ-based disk device.
It is an object of the present invention to provide an optical disk drive device that allows an optical head to reach a target track position reliably.

Another object of the present invention is to provide an optical disk drive having a track selection mechanism that ensures that the original track reaches the desired track position in the spiral trunk.

According to the present invention, an optical disc having spiral tracks and assigned track numbers can be rotated.

In a disc drive that performs playback, recording, and playback, a mechanism for detecting all rotational positions where the track number changes, and a function for correcting the number of tracks to be moved during track access by obtaining a position signal from the detection mechanism. There is obtained an optical disk drive device characterized in that it has a track selection mechanism.

The present invention provides a mechanism for detecting the rotational position at which the track number changes in a 9-dimensional disk device that rotates an optical disk having a spiral track and on which a track number is recorded in advance to perform playback, recording, and playback. , a mechanism is provided to control the original head to move according to the number of pitches to be moved given by the control circuit, and to continue skipping until the number of pitches reaches zero Vc. When a signal indicating a changing rotational position (hereinafter referred to as an Intex signal) is received, the number of pitches is subtracted even though a jump is executed, or the number of pitches is only subtracted without executing a jump.') It is intended to be controlled.

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

FIG. 1 shows an optical disc drive device according to an embodiment of the present invention. In FIG. an Intex sensor 3 that detects a mark (rotational position) indicating a change point of the track number attached to the track number;
An INTEX sensor amplifier 4 that amplifies and shapes the output of the INTEX sensor 3 to make it into a pulse; a control circuit 5 that gives an operation command; and a track selection mechanism 6 that executes access based on signals from the control circuit 5 and the INTEX sensor amplifier 4.
, an optical head drive motor 7 controlled by the track selection mechanism 6, and an optical head 8 moved by the optical head drive motor 7.

The original disk 1 has spiral tracks, and one of the tracks
A track number of 111 is assigned to each rotation, and the track number is recorded in advance. Also the original disc lv
In c, a mark (rotational position) indicating the change point of the track number is marked at the position where the track number is recorded, and this mark is placed on the index sensor 3 [,! t) The detected position is 9.

An operation command is given to the control circuit 5, and the number of pitches by which the optical head should be moved is supplied to the track selection mechanism 6.

In the track selection mechanism 6, each time the L head skips a track, the number of pitches is reduced by 1 - q', or the original head does not skip a track and increases the number of pitches by 1. The optical head drive motor 7 is controlled until the value of the pitch number becomes zero.

FIG. 2 (details of the track selection mechanism). In FIG. and a flip-flop 12 which receives the index signals from and the jump clock.

A D-type latch circuit 13 that holds the state of the flip-flop 12, and an AND circuit 31. Nando circuit 32~
35 and an inverter 36. When the track selection mechanism 6 receives the index signal 18 while the optical head is accessing, it subtracts the subtraction counter without executing skipping during forward access, and subtracts the counter by executing KU skipping during rebus access. 3 (5) and 3 (
It operates as shown in the time chart of B).

That is, the operation of the present invention will be explained with reference to FIG. In response to the control circuit F, a take indicating the number of pitches on the bus 14 is loaded.The subtraction counter 11 is subtracted by a subtraction pulse 16vr-F, which will be described later.A zero signal 17 when the contents of the subtraction counter become zero.
It is notified that the content of the rc control circuit 511C subtraction counter is ≠. The "jump" clock signal 19 is a clock that indicates the jump start interval given by the control circuit. When the intex signal 18 comes during forward access, the 7 lip-flop 12 is set and the inch forward low signal 21 becomes low, causing the controller to Forward signal 21CJ that has been sent: Gates off the output pulse of the forward jump signal 26 that has been sent by one pulse. Subtraction of the subtraction counter is performed without being affected by the subtraction pulse 16 μ. Own low signal 21
At the front end of the jump clock signal after the jump clock signal 19 is output, the INTEX found reset high signal 22 starts to be output, and at the rear end of the jump clock 19, the index found low signal 21 is reset.

Similarly, when the IQJ intex signal 18 is received during rebus access, the intex found high signal 20 goes high and is ANDed with the rebus signal 23 sent to the control circuit 5L, reducing the percentage. The pulse is removed and is not output, and the rebus jump signal 25 is output without being affected by the delay. The process by which the INTEX found high signal 20 is reset is the same as the process by which the INTEX found low signal 2175'' is reset.

A rebus jump signal 25 or a 7 reverse jump signal 26vX is transmitted from within the track selection mechanism to the optical head drive motor for rebus jump.

Alternatively, a forward jump is executed and the optical head is fully driven. Therefore, in the embodiment of the present invention, when the index signal 18 arrives, the change in the number of pitches to be jumped due to the rotation of an optical disk having a spiral track is detected. During access, [i-jump] is paused once and the jump is executed, so the number of power tracks to be moved can be corrected.As explained above, the present invention uses the track selection mechanism. This has the effect of reliably VC positioning the original head on the track.

[Brief explanation of drawings]

Figure 81 is a block diagram showing one embodiment of the present invention, Figure 2 is a diagram showing the main parts of the track selection machine used in the embodiment of the present invention, and Figure 3 is a diagram showing the time chart of the circuit in Figure 2. It is. 1... Optical disk, 2... Original disk side movement motor, 3... Index sensor. 4... Intex sensor amplifier, 5... Control circuit. 6... Track selection machine, 7... Optical head drive motor, 8... Optical head, 11... Subtraction counter,
12...7 Ritsugunrotsu circuit, 13...D type ratte circuit. 14...Bus, 15...Counter low) 'fff number, 16...Subtraction pulse, 17...Subtraction counter zero signal, 18...Intex signal, 19...Jump clock signal. 20... Inch forwarding signal, 21.
...Index found low signal, 22...Intex found reset signal, 23...Rinox signal, 24...Forward signal, 25...Rebus jump signal, 26...Forward jump signal, 3
1...AND circuit, 32-35...NAND circuit, 3
6... Imperter

Claims (1)

[Claims] In an optical disk device that performs playback, recording and playback by rotating an optical disk having spiral tracks and assigned track numbers, a mechanism for detecting all rotational positions where the track number changes, and a position of the detection mechanism. and a track selection mechanism having means for obtaining a signal and correcting the number of tracks to be moved during track access.