JPH04243080A - Optical disk device - Google Patents

Abstract

PURPOSE:To easily and surely remove the static electricity accumulated in a light emitting device of the optical disk device constituted by connecting the light emitting device and a driving circuit for driving this device with a flexible printed circuit board. CONSTITUTION:The optical disk device 1 provided with the light emitting device 8 which irradiates a disk with light, the driving circuit (disposed on a circuit board 6) for driving this light emitting deice 8, and a flexible printed circuit board 21 on which a signal lead 22 which electrically connects the light emitting device 8 and this driving circuit, and a grounded earth lead 23 are formed is provided with a switch 26 for connecting/disconnecting the signal lead 22 formed on the above-mentioned flexible printed circuit board 21 and the earth lead 23. The switch 26 may be disposed in any position, insofar as this position is between the light emitting device 8 and the driving circuit formed on the circuit board 6. This switch is preferably disposed in the position as near the light emitting device 8 as possible in order to effectively remove the static electricity.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an optical disc device.
In particular, the present invention relates to an optical disk device having a structure in which a light emitting device and a drive circuit for driving the light emitting device are connected by a flexible printed circuit board.

0002

2. Description of the Related Art Generally, an optical head is mounted on an optical disk device, such as a magneto-optical disk device or a compact disk device, which performs recording/reproducing processing using light. This optical head uses a light emitting device such as a laser diode,
A light receiving device such as a phototransistor, an optical system such as a lens, and various drive mechanisms for performing tracking and focusing servo are provided.

Among these, a light emitting device such as a laser diode is connected to a drive circuit that drives it, but the location of the light emitting device is limited by the location of the optical system.
Generally, it is arranged at a position separated from the drive circuit. For this reason, a flexible printed circuit board is disposed between the light emitting device and the drive circuit, which are arranged apart from each other, and is configured to electrically connect the two.

On the other hand, it is known that light emitting devices are susceptible to static electricity, and if accumulated charges are supplied to the terminals of a laser diode, there is a risk that the light emitting device will be damaged. This static electricity is generated during the operation of the optical disk drive and accumulated in the light emitting device, or static electricity generated due to friction of the worker's clothes during maintenance, etc. can be generated when the worker touches the light emitting device during maintenance, etc. is accumulated in

[0005] Therefore, in order to operate the optical disc device smoothly, it is necessary to release the accumulated static electricity. Conventionally, in order to release this accumulated static electricity, a worker manually connects a terminal connected to a light emitting device and a ground terminal to remove the accumulated static electricity.

[0006]

However, in the conventional method in which a worker manually connects a terminal connected to a light-emitting device and a ground terminal, it is difficult to make a mistake (connecting a terminal connected to a light-emitting device to a terminal other than the ground terminal). There was a problem that the light emitting device could be damaged due to this.

[0007] Furthermore, as described above, static electricity may be accumulated on the worker due to friction of clothing or the like. If the above-mentioned process is performed by a worker who has accumulated static electricity, there is a risk that the light-emitting device will be damaged by the worker touching the terminal connected to the light-emitting device rather than removing the static electricity.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an optical disk device that can easily and reliably remove static electricity accumulated in a light emitting device.

[0009]

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a light emitting device that irradiates light onto a recording medium, a drive circuit that drives the light emitting device, and a combination of the light emitting device and the drive circuit. In an optical disk device comprising a flexible printed circuit board formed with a connection lead for electrically connecting between the two and a grounded earth lead,
The present invention is characterized in that a switch is provided for connecting/disconnecting the connection lead and the ground lead formed on the flexible printed circuit board.

0010

[Operation] In the optical disc device having the above structure, static electricity accumulated in the light emitting device can be removed by operating a switch. Therefore, there is no risk of making operational mistakes, and even if the operator has accumulated static electricity, the static electricity accumulated in the light emitting device can be removed by operating the switch, so that the electrostatic charge accumulated on the operator can damage the light emitting device. This can be prevented.

[0011]

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

FIGS. 3 and 4 show an optical disk device (in this embodiment, a magneto-optical disk device; hereinafter simply referred to as the device) 1 is an embodiment of the present invention. Roughly speaking, the device 1 includes a turntable 3, an optical head 4, and a disk (disk-shaped recording medium) attachment/detachment mechanism 5 on a chassis 2.
, a circuit board 6, etc. are provided.

The turntable 3 has a disk mounted on its upper surface, and is configured to be driven by a motor disposed on the back surface of the chassis 2. This motor rotates the disk placed on the turntable 3 at a constant rotation speed.

The optical head 4 is configured to be movable by an actuator 7 provided on the chassis 2 in the radial direction of the disk mounted on the turntable 3, that is, in the directions indicated by arrows A and B in the figure. . This optical head 4 performs recording and reproducing processing on the disc. Note that this optical head 4 is equipped with a light emitting device (
(laser diode) is not provided, and the light emitting device 8
are arranged on a circuit board 6, which will be described later.

The attachment/detachment mechanism 5 is composed of a slider 9, a disk holder 10, and the like. The loading/unloading mechanism 5 transports the disc between an eject position and a loading position (position placed on the turntable 3). The slider 9 is arranged so as to be slidable on the chassis 2 in the directions of arrows A and B. This slider 9 has a spring 13a
, 13b in the A direction. Further, the disc holder 10 has a structure in which a disc is inserted into the disc holder 10 and can hold the disc. Slanted grooves 11a to 11d are formed on the side of the slider 9, and pins 12a to 12d are formed on the side of the disc holder 10.
12d is engaged with these inclined grooves 11a to 11d.

Therefore, the disc holder 10 is configured to move up and down as the slider 9 slides on the chassis 2 in the directions of arrows A and B. Specifically, when the slider 9 slides in the A direction, the disc holder 10 moves downward and the disc is mounted on the turntable 3, and when the slider 9 slides in the B direction, the disc holder 1
0 moves up and ejects the disc. Therefore, the disk is transferred between the eject position and the mounting position by the vertical movement of the disk holder 10 in conjunction with the sliding movement of the slider 9. In addition, 14 in the figure is a latch lever, and this latch lever 14 holds the slider 9 in the eject state.
The slider 9 is locked at a position displaced in the direction A, and when a disk is inserted, this lock is released to allow the slider 9 to be displaced in the A direction.

The circuit board 6 has various circuits and devices arranged on the printed circuit board, such as a drive circuit for the actuator 7, a signal processing circuit for recording and reproducing processing, a light emitting device 8, and a drive circuit for driving the light emitting device 8. It is said that the structure is as follows.

The circuit board 6 is shown enlarged in FIGS. 1 and 2, and will be described in detail below. Note that illustration of electronic elements constituting each drive circuit and signal processing circuit is omitted in each figure.

The circuit board 6 has an integrated circuit element 1 on its upper surface.
6, connectors 17, 18, etc. are provided. Furthermore, a light emitting device 8, optical components 19, etc. are arranged on the back surface. Furthermore, a high frequency superimposing unit 20 for superimposing high frequency waves supplied to the light emitting device 8 is disposed on the side thereof.

The light emitting device 8 is arranged at a position facing the light receiving section 4a formed in the optical head 4. Further, since the light emitting device 8 and the light receiving section 4a are arranged in a row in the direction A in the figure, even if the optical head 4 moves during recording/reproducing processing, the light emitting device 8 disposed on the circuit board 6 The structure is such that light is more reliably supplied to the optical head 4.

This light emitting device 8 includes a high frequency superimposition unit 20
Furthermore, the high frequency superimposition unit 20 is connected to the circuit board 6 via the flexible printed circuit board 21 and the connector 17.
The light emitting device driving circuit is connected to the light emitting device drive circuit arranged in the.

The flexible printed circuit board 21 has four leads 22 to 25 formed thereon, as shown in FIG. Among these, 22 is a signal lead through which a signal from the light emitting device flows, 23 is a grounded earth lead, 24 is a control signal lead through which a control signal of the high frequency superimposition unit 20 flows, and 25 is a signal lead through which a control signal of the high frequency superimposition unit 20 flows. This is the power supply lead.

[0023] This flexible printed circuit board 21 includes:
A short switch 26, which is a feature of the present invention, is provided. The short switch 26 is a slide type changeover switch, and among the four leads 22 to 25 mentioned above,
It is arranged between the signal lead 22 and the ground lead 23. Switch knob 27 of this short switch 26
By operating the signal lead 22 and ground lead 2
3 is connected.

As described above, the light emitting device 8 is susceptible to static electricity, and the accumulated charge is transferred to the light emitting device (laser diode) 15.
If the static electricity is supplied to the terminal, there is a risk of damage, so it is necessary to dissipate the accumulated static electricity. The present invention is characterized in that a short-circuit switch 26 is provided as a means for releasing accumulated static electricity, and static electricity can be removed by operating this short-circuit switch 26. By providing the short-circuit switch 26, static electricity can be removed simply by operating the switch knob 27. Therefore, there is no need to manually connect each lead as in the conventional case, and static electricity can be easily removed. In addition, even if the worker himself has accumulated static electricity due to friction with his clothes, etc., the static electricity can be removed by operating a switch, so there is no possibility that the static electricity accumulated on the worker will flow to the light emitting device 8. Also from this point of view, damage to the light emitting device 8 can be prevented.

[0025] In the above embodiment, a slide type changeover switch is shown as the short switch 26, but
The structure of the short-circuit switch 26 is not limited to this, and it is also possible to use a switch with another structure, such as a push button type.

Furthermore, in this embodiment, the short switch 2
6 is arranged between the high frequency superimposition unit 20 and the connector 17.
Although the example is shown in which the short switch 26 is located between the light emitting device 8 and the
It may be placed anywhere between the drive circuit and the drive circuit formed on the circuit board 6. However, in order to effectively remove static electricity, it is desirable to arrange it as close to the light emitting device 8 as possible.

[0027]

As described above, according to the present invention, the static electricity accumulated in the light emitting device can be removed by operating a switch, so there is no risk of making an operational error, and the static electricity accumulated on the operator is eliminated. It has the advantage of being able to prevent the light emitting device from being damaged by static electricity.

[Brief explanation of the drawing]

FIG. 1 is an enlarged side view showing a circuit board installed in an optical disc device according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view showing a circuit board installed in an optical disc device according to an embodiment of the present invention.

FIG. 3 is a plan view of an optical disc device that is an embodiment of the present invention.

FIG. 4 is an exploded perspective view of an optical disc device that is an embodiment of the present invention.

[Explanation of symbols]

1 Equipment 2 Chassis 4 Optical head 6 Circuit board 8. Light emitting device 17 Connector 20 High frequency superposition unit 21 Flexible printed circuit board 22 Signal lead 23 Earth lead 26 Short switch 27 Switch knob

Claims (1)

[Claims] 1. A light emitting device that irradiates light onto a recording medium, a drive circuit that drives the light emitting device, a connection lead that electrically connects the light emitting device and the drive circuit, and a grounded connection lead. An optical disk device comprising a flexible printed circuit board formed with a ground lead formed on the flexible printed circuit board, further comprising a switch for connecting/disconnecting the connection lead formed on the flexible printed circuit board and the ground lead. Optical disk device.