JPS63214972A - Temporary pausing device for disk reproducing device - Google Patents

Abstract

PURPOSE:To restore a pickup position to a track position at the time of temporarily pausing and to continuously reproduce screen after releasing the temporary pausing by comparing the number of rotation of a disk driving motor at the time of specifying the temporary pausing with the number of rotation of the disk driving motor which continues tracking in the midst of temporary pausing. CONSTITUTION:A titled device provides a rotating number detection means 6 for the disk driving motor, a jump pulse generation means 8 and a control means 7 and it utilizes that number of rotation of a disk is proper according to the position on the radius of the disk 10 of a track. And by setting the number of rotation of the disk driving motor 5 at the time of specifying the temporary pausing as a reference, the number of rotation of the disk driving motor 5 which continues tracking in the midst of temporary pausing is compared with the reference and the pickup 1 is driven to move to the track at the time of specifying the temporary pausing. Thus, the screen can be continuously reproduced after releasing the temporary pausing without receiving the effect even by the scratch of the disk 10 and the vibration and the impact, etc., in the midst of temporary pausing.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pause device for a playback device for a disc on which information is recorded at a constant linear velocity.

(Prior Art) Conventionally, a disk on which a video signal is optically or electrostatically recorded has a method in which one screen is recorded per rotation of the disk (Constant Angular Velocity).
ty (abbreviated as CAW) and one in which the relative speed of the disk to the recording means or pickup means, that is, the linear velocity of information scanning is constant (Constant Lin@
, Vslocity, abbreviated as CLV).

In the CAW system, if the pickup position is returned to the initial position every time the disk rotates during a pause and the same track portion is repeatedly traced, continuous playback of the screen will be possible even after the pause is released. Becomes @.

On the other hand, with CLV discs, the linear velocity is constant, so the disc rotation speed differs depending on the position of the track on the disc radius, and the number of screens recorded on the disc rotation also differs, so there is a pause. It is difficult to pause the screen so that it can be played continuously even after the screen is released.

In order to solve this problem, the configuration is such that tracking control and rotation temperature control continue even during a pause, and the initial track position (temporary It may be configured to jump the track in order to return to the track position M) at the time of the stop command.

However, if the cycle of performing this track jump is set as the tracking control stroke width, the rotational speed of the disk will be greatly different between the time when the track jump is performed and the time after the track jump, and the rotation speed control after the track jump will be disturbed. Therefore, if the transition from pause to playback is made immediately after a track jump, good playback will not be possible.

In order to prevent this kind of situation, it is sufficient to configure the structure so that track jumps are performed in as short a cycle as possible, and various methods such as Japanese Patent Laid-Open No. 57-150171 and Utility Model Laid-Open No. 57-61641 have been proposed for this purpose. It is considered.

That is, even after a pause command is issued during playback, tracking control is continued in the same way as during playback, and a predetermined rotation (for example, one rotation) of the subi/dollar from the time of the predetermined pause command is detected by some method. The track jump is performed to the track position at the time of the temporary stop command.

(Problems with conventional technology) However, in the above conventional configuration.

Tracking continues even after a pause command is issued, and track jumps are performed in proportion to the number of spindle rotations (i.e., the number of disk rotations) since the pause command. If a tracking error occurs due to scratches, vibration, impact, etc., a track jump will be performed from the incorrect track position. In this case, the track position after the track jump is, of course, different from the track position at the time of the temporary stop command, and will not return to the original position again.

As a result, when the pause is canceled and playback is restarted, there is a problem in that the screen is discontinuous from the one displayed when the playback was paused.

(Object of the Invention) In view of the above-mentioned circumstances, the present invention is capable of track jumping to and returning to the track position at the time of pausing without being affected by scratches on the disk or vibrations and shocks during pausing.

3 even after canceling the pause! ! It is an object of the present invention to provide a pause device for a disc playback device that enables the playback of a unified screen.

(Means for Solving the Problems) Therefore, 1. The pause device of the disk playback device according to the present invention includes a disk drive motor rotation speed detection means, a jump pulse generation means, and a jump pulse generation means for detecting the rotation speed of the disk drive motor at the time of a pause command. control means for storing the rotational speed of the track and comparing the stored disk drive motor rotational speed with the disk drive motor rotational speed to operate the jump pulse generating means; Taking advantage of the fact that the disk rotation speed is unique depending on the position on the disk radius, the rotation speed of the disk drive motor at the time of the temporary stop specification and the rotation speed of the disk drive motor at the time of the temporary stop specification are determined based on the rotation speed of the disk drive motor at the time of the temporary stop specification. The system compares the number of rotations of the differential drive motor during tracking and moves the pickup to the track at the time when a temporary stop is specified.

(Embodiment) FIG. 1 is a block diagram showing the configuration of a pause device of a disc playback device according to the present invention.

Reference numeral 10 denotes a disk, which is rotationally driven by a spindle motor 5.

Then, bits formed in a spiral shape on the upper surface of the disk 10 are traced by a pickup 1, and recorded signals are read and information regarding tracking control is also derived.

Note that a rotation speed detection device g16 is installed on the spindle motor 5 to detect the rotation speed of the spindle motor 5.

The tracking control information is sent to the tracking signal processing circuit 2.
The tracking signal processing circuit 2 generates a tracking signal [11]. The tracking control signal is inputted to the tracking drive circuit 3, and the tracking actuator 4 is actuated in response to the tracking drive signal from the tracking drive circuit 3, thereby controlling the tracking of the pickup 1. That is, a tracking control loop is formed by the pickup 1, the tracking signal processing circuit 2, the tracking drive circuit 3, and the tracking actuator 4.

Further, CLVit1@ of the rotation of the disk drive motor 5 is controlled by the jump pulse generation circuit 8.
It is connected to a temporary stop control device R7 constituted by a microcomputer via a microcomputer, and during normal playback, tracking control of the pickup 1 is performed as described above.

It also outputs a signal for driving a track jump based on a signal from the temporary stop control device 7.

A rotation speed detection device 6 is connected to the temporary stop control device R7, and the rotation speed of the spindle motor 5 detected by the rotation speed detection device 6 is input, and a signal input terminal 9 is provided. The configuration is such that a temporary stop command signal is input from the controller.

Therefore, - temporary stop 1111 by the time stop control device 7
is carried out as shown in FIG. That is.

When a temporary stop command signal is input to the signal input terminal 9, the rotation speed A of the spindle motor 1 output from the rotation speed detection device 6 is read and stored.

Next, the current rotational speed B of the spindle motor 1 is read and compared with the rotational speed A of the spindle motor 1 at the time of temporary stop and command.

Here, if A>B (if the current rotational speed of the spindle motor 1 is lower than that at the time of the pause command, which means that the trace track has moved to the outer circumferential side), a jump pulse is generated. Circuit 8 outputs a hejump signal.

The jump pulse generation circuit 8 to which the jump signal has been input generates a jump pulse, and inputs the jump pulse to the tracking actuator 4 to actuate the tracking actuator 4 by a predetermined amount, thereby causing the trace track of the pickup 1 to be activated at the time of a temporary stop command. This is to jump the track to a track position where the rotation speed is the same.

(Effects of the Invention) According to the pause method of the disk playback device according to the present invention, if the disk rotation speed changes from the disk rotation speed at the time of the pause command due to the tracking control that is continued even during the pause, the pause is stopped. By configuring the track to jump to the track position of the disk rotation speed at the time of the pause command based on the disk rotation speed at the time of the pause command, scratches, vibrations, and shocks on the disk can be avoided when tracking control is continued after the pause command. Even if tracking control is disturbed due to this, it is possible to return the pickup position to the track position at the time of pause without being affected by it, and therefore, continuous playback of the screen is possible even after the pause is released. It is something.

Furthermore, since the track jump period is short, the amount of change in the disc rotational speed is small, and stable rotational speed control is possible even during playback after a pause is released.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a pause device of a disc playback device according to the present invention. FIG. 2 is a control flowchart. l...Pickup 5...Spindle motor (disk drive motor) 6...Rotation speed detection device (rotation speed detection means) 7...Pause control device (pause control means) 8...Jump pulse Generation circuit (jump pulse generation means)

Claims (1)

[Claims] Based on the information detected by the pickup Tracking control of the pickup A digital camera with a tracking control loop that Information is recorded at a constant linear velocity using a tall signal. In a disc playback device, the disc drive The rotation speed detection means of the dynamic motor and the jump pad Lust generation means and before the temporary stop command Memorize the rotation speed of the disk drive motor Along with the memorized disk drive motor rotation Comparing the number and disc drive motor rotation speed activating the jump pulse generating means; Equipped with a temporary stop control means to specify a temporary stop. Based on the rotation speed of the disk drive motor at Disk drive at the time of specified temporary stop Tracks motor rotation speed and even during pause The number of revolutions of the disk drive motor during continuous Compare and pick the track when the pause is specified. Configuring the drive to move the A temporary disc playback device characterized by: Stop device.