JPH0658489U - Disc player - Google Patents

Abstract

(57) [Summary] [Structure] The turntable unit 5 is supported by the arm housing 4 swinging between the first and second disks 23, 25, and the optical pickup unit 6 is movably supported by the arm housing 4. The disc reproducing apparatus 1,
The disc reproducing apparatus 1 simultaneously starts the movement drive of the optical pickup unit 6 toward the innermost peripheral portion of the disc and the swing drive of the arm housing 4 after the completion of the reproduction of one disc, and both the movement and the swing drive are started. A disc reproducing apparatus 1 equipped with a control mechanism for starting driving of a focusing servo mechanism in response to a completed signal. [Effect] The swinging of the arm housing and the movement of the optical pickup unit can be performed simultaneously in parallel, and thus the time for switching disks can be greatly reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a twin type disc reproducing device.

[0002]

[Prior art]

 FIG. 4 is a schematic view of a conventional twin type disc reproducing apparatus, in which two first and second discs 101 and 102 are placed, and both types of discs are continuously reproduced or any one of them is reproduced as a twin type. It is called a disc player. An optical pickup unit 106 and a turntable unit 107 are held by a chassis 103 on an arm housing 105 that swings about a shaft 104.

For example, in the case of continuous reproduction, the light is emitted from the innermost peripheral portion 101a of the first disc 101 (herein, what is called TOC (Table of contents), which serves as a table of contents) is recorded. The tracing of the pickup unit 106 starts, and the pickup unit 106 moves as shown by the arrow to reproduce the first disc 101.

After the reproduction of the first disc 101 is completed, the arm housing 105 oscillates as shown by the arrow to expose the turntable unit 107 and the optical pickup unit 106 to the second disc 102. The time required for this swing (arrow) is about 3 seconds.

Next, the optical pickup unit 106 is moved to the innermost peripheral portion 102a of the second disk 102 for TOC reading (arrow). The time required for this movement (arrow) is about 6 seconds. After that, the focusing servo mechanism of the optical pickup unit 106 operates to perform focusing, and subsequently, the reproduction (arrow) of the second disk 102 is performed. Since the focusing servo mechanism described above is delicate, it is operated when the arm housing 105 is stationary.

[0006]

[Problems to be solved by the device]

 Therefore, as described above, for example, 9 seconds, which is the total of 6 seconds of swing and 3 seconds of movement, is required for switching. However, it is not desirable for the continuous playback device to have a long switching time, and a technique for shortening the switching time is desired.

[0007]

[Means and Actions for Solving the Problems]

 In order to meet the above demand, the present invention starts at the same time as the movement drive of the optical pickup toward the innermost circumference of the disc and the swing drive of the arm housing after the reproduction of one disc is completed. In response to this, it is equipped with a control mechanism that starts driving the focusing servo mechanism.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of the reference numerals.

FIG. 1 is a plan view of a disc reproducing apparatus according to the present invention. The disc reproducing apparatus 1 is mounted on a chassis 2 so as to be swingable around a shaft 3 and an arm housing 4 held by the arm housing 4. The turntable unit 5, an optical pickup unit 6 mounted on the arm housing 4 so as to be able to move laterally, a rest switch 10 for detecting that the optical pickup unit 6 has reached the innermost circumference of the disc, First and second switches 11 and 12 for monitoring the position of the arm housing 4, an arm drive mechanism 13 for swinging the arm housing 4 at a fixed angle, and a control mechanism for starting control of a focusing servo mechanism (details will be described later). Consists of.

By rotating the motor 14 of the arm driving mechanism 13 forward and backward, the large gear 18 of the arm housing 4 can be driven via the worm 15, the wheel 16 and the small gear 17.

The arm housing 4 is provided with two claws, and when these claws press the first switch 11 or the second switch 12, the first and second switches 11 and 12 operate, and the motor 14 Stop.

The optical pickup unit 6 shown by a solid line reciprocates to a position indicated by an imaginary line by the feed motor 19, the gear group 20, and the pinion rack mechanism 21. The position of the imaginary line is the innermost peripheral position of the optical pickup unit 6, and the position detection is performed by the rest switch 10 described above.

The arm housing 4 has a hinge structure near the center of rotation (the shaft 3), and the turntable unit 5 has a structure in which the turntable unit 5 comes in contact with and separates from the disc (in the front and rear directions in the figure).

The operation of the disc reproducing apparatus having the above configuration will be described below. 2A to 2C are operation explanatory views of the disc reproducing apparatus according to the present invention. In FIG. 2A, an optical pickup unit from the innermost peripheral portion 23a to the outermost peripheral portion 23b of the first disc 23 is shown. 6 moves (arrow) to reproduce the first disc 23. During this time, the first switch 11 is in the ON state.

When the reproduction of the first disc 23 is completed, the arm housing 4 including the optical pickup unit 6 starts swinging and swinging toward the second disc 25, and the optical pickup unit 6 moves to the second disc. The optical pickup unit 6 starts to move toward the innermost peripheral portion 25a, and as a result, the optical pickup unit 6 moves obliquely as shown by the arrow instead of the locus shown by the imaginary line.

As described in the section of the prior art, the time required to swing the arm housing 4 is about 3 seconds, and the time required to move the optical pickup unit 6 is about 6 seconds.

In FIG. 2C, the second switch 12 is turned on, and the arm housing 4 ends its movement, but the optical pickup unit 6 is in the middle of movement. Therefore, in FIG. The unit 6 faces the innermost peripheral portion 25a of the disc 25 (arrow), and when the rest switch 10 is turned on, the focusing servo mechanism starts to operate. This starts the reproduction of the second disc 25.

In the above, the time required from the end of the reproduction of the first disk 23 to the start of the reproduction of the second disk 25 is about 6 seconds, which is 33% shorter than the conventional time of about 9 seconds. .

Although what is described in FIGS. 2A to 2C is a simple continuous reproduction, the disk reproducing apparatus 1 interrupts the reproduction at any time to change from the first disk 23 to the second disk 25 ( Alternatively, it is characterized in that the reproduction target is switched. Then, if the above switching is performed in a state where the optical pickup unit 6 is located not far from the innermost peripheral portion 23a of the first disc 23, the swing time of the arm housing 4 (about 3 seconds) is not reached. Further, the optical pickup unit 6 reaching the innermost peripheral portion of the disc pushes the rest switch 10, and as a result, the focusing servo mechanism is started even though the arm housing 4 is swinging.

As described above, it is not preferable to operate a delicate focusing servo mechanism in an unstable state. Therefore, the present invention is characterized by having the following control mechanism.

FIG. 3 is a flowchart relating to the control mechanism of the disc reproducing apparatus of the present invention, in which the reproduction of the first disc is completed at S 01 (meaning step 01. The same applies hereinafter), and at S 02 and S 03. The optical pickup unit and arm housing are driven.

In S04, the rest switch is turned on and the second switch is turned on until the two conditions are satisfied. That is, when the optical pickup unit is near the outermost peripheral portion of the first disc, the rest switch is turned on late, so the completion of movement of the optical pickup unit (rest switch on) is waited for.

Further, when the optical pickup unit is located in the vicinity of the innermost peripheral portion of the first disc, the completion of the swing of the arm housing (the second switch is turned on) is waited for. When the AND condition is satisfied, the second disc is reproduced in S05 to S08.

As is clear from FIG. 3, the time required to satisfy the AND condition is between about 3 seconds and about 6 seconds, and the maximum is about 6 seconds. Further, since the focusing servo mechanism is started after the AND condition is satisfied, that is, after the arm housing is stationary, there is no fear of giving vibration to the mechanism.

[0025]

[Effect of device]

 As described above, the present invention starts simultaneously with the movement drive of the optical pickup toward the innermost circumference of the disc and the swing drive of the arm housing after the completion of the reproduction of one disc, and both the movement and the swing drive are completed. Since a control mechanism that starts driving the focusing servo mechanism in response to a signal is equipped, swinging of the arm housing and movement of the optical pickup unit can be performed in parallel at the same time. Can be shortened to

[Brief description of drawings]

FIG. 1 is a plan view of a disc reproducing apparatus according to the present invention.

FIG. 2 is an operation explanatory diagram of the disc reproducing apparatus according to the present invention.

FIG. 3 is a flowchart relating to the control mechanism of the disc reproducing apparatus of the present invention.

FIG. 4 is a schematic diagram of a conventional twin type disc reproducing apparatus.

[Explanation of symbols]

1 ... Disk reproducing device, 4 ... Arm housing, 5 ... Turntable unit, 6 ... Optical pickup unit,
23 ... 1st disc, 25 ... 2nd disc.

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[Procedure amendment]

[Submission date] April 6, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a plan view of a disc reproducing apparatus according to the present invention.

FIG. 2 is an operation explanatory diagram of the disc reproducing apparatus according to the present invention.

FIG. 3 is an operation explanatory diagram of the disc reproducing apparatus according to the present invention.

FIG. 4 is an operation explanatory diagram of the disc reproducing apparatus according to the present invention.

FIG. 5 is a flowchart relating to the control mechanism of the disc reproducing apparatus of the present invention.

FIG. 6 is a schematic diagram of a conventional twin type disc reproducing apparatus.

[Explanation of Codes] 1 ... Disk reproducing device, 4 ... Arm housing, 5 ... Turntable unit, 6 ... Optical pickup unit,
23 ... 1st disc, 25 ... 2nd disc.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

Claims (1)

[Scope of utility model registration request] 1. A disc reproducing apparatus in which first and second discs are mounted and which are selectively reproduced by one turntable unit and an optical pickup unit, wherein the turntable unit is provided between the first and second discs. Is a disc reproducing device supported by an arm housing that swings, and the optical pickup unit is movably supported by the arm housing. The disc reproducing device faces the innermost circumference of the disc after the completion of reproduction of one disc. It is equipped with a control mechanism that starts the movement drive of the optical pickup and the swing drive of the arm housing at the same time, and receives the movement completion signal and the swing completion signal to start the driving of the focusing servo mechanism. Disc playback device.