JPH03185675A - Electrostatic damage prevention device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for preventing electrostatic damage to electronic components inside an optical disk drive device that occurs during manual insertion of a cassette.

[Prior Art] The electrostatic breakdown phenomenon is a phenomenon in which static electricity flows into the device and destroys the electronic components due to human contact in devices that use electronic components. However, the inside of the front operation section is covered with a thin metal piece, and grounding is achieved by connecting the thin metal piece with a lead wire to a large metal housing such as the main chassis that holds printed circuit boards with electronic components. Ta.

This type of method is commonly used in home Wi-Fi products such as VTRs and audio equipment.

This embodiment will be explained with reference to FIG.

FIG. 6 shows an external view of the CD player, and when the printed circuit board 15 equipped with the operation button 13 and its switch 14 provided on the front is close, the printed circuit board 15 is plated with metal or metal as shown in the figure. A part of it is covered with resin 16 or the like and connected to the grounding part of the main printed circuit board 18 using a lead wire 17 to prevent static electricity from flowing to a place other than the electronic parts.

[The invention attempts to solve the problem.] [Jll] Even if the above-mentioned conventional technology is applied to an optical disk drive device, the lid of the cassette that houses the disc is made of metal, and when the cassette is inserted into the device by holding this part with your finger, the metal lid and the turntable will be damaged. When metal parts such as these touch or come close to each other, static electricity flows to electronic components such as Hall elements and laser diodes, causing electrostatic damage.

If electrostatic damage occurs, the turntable may remain stopped and not start up, or the laser diode may stop irradiating the disc, causing the optical disc to malfunction, resulting in t1! A serious problem will occur that will cause the system to stop functioning.

An object of the present invention is to prevent electrostatic damage to an optical disk device or magneto-optical disk device using a cassette equipped with a lid made of a metal piece.
An object of the present invention is to provide a device for preventing the Il phenomenon.

[Means for solving the problem] In order to achieve the above object, one end of a leaf spring is fixed to a metal frame configured inside the front operation panel of the device, and the other end is arranged so as to come into contact with the metal lid when inserting a cassette. This is what I did.

Alternatively, one end of a leaf spring similar to 1 H is fixed to a cassette storage case that is electrically connected to the chassis of the device through lead wires, etc., and the other end is arranged so that it comes into contact with the metal lid when the cassette is inserted. .

[Function] Even if the gold RM touches the turntable and the hand of the cassette inserter, the leaf spring is in contact with it in front of it, so the D electricity is transmitted through the leaf spring and flows to the frame, chassis, etc., so it does not reach the electronic parts and is static electricity. No destructive phenomena occur.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 5. Reference numerals 1 and 2 in each figure represent a leaf spring A.

The plate spring A1 is made of a conductor such as stainless steel plate or phosphor bronze for springs and has a cantilever shape as shown in FIG. As shown in , caulk, pressure 1'1. It is fixed in an electrically conductive manner by screwing, clipping, etc. Further, the metal frame 4 is fixed to a fully bent chassis 5 with screws 6 or the like.

Further, as shown in the first part, the leaf spring B2 is fixed at one end to the cassette storage case 7 by caulking, crimping, screwing, pinching, etc. so as to be electrically conductive.

Furthermore, the cassette storage case 7 is fixed to the metal chassis 5 by lead wires (not shown in the figure).

Further, the free ends of the leaf springs At and B2 are respectively positioned in the metal frame 4 so that they come into contact with the metal M9 with a certain pressure when the cassette 8 is inserted. It is fixed to the cassette storage case 7.

In addition, as shown in FIG. 3, the free ends of the leaf springs At and B2 are provided with Rla by appropriate bending or a diaphragm 2a with a low drawing ratio to ensure electrical continuity.

As for the leaf spring A1 and the leaf spring B2, only the leaf spring A1 may be used, only the leaf spring B2 may be used, or both may be used at the same time.The fixed ends 1b and 2b are connected to the frame 5 and the cassette storage case. Optical pickabs other than 7 (not shown in the diagram)
A mechanical base (not shown in the diagram) that supports the sliding shaft may also be used.

The electrostatic damage prevention function of the cassette 8 equipped with the metal M9 of the apparatus to which is equipped with the above-mentioned leaf spring A1 or 1 and leaf spring B2 will be explained below with reference to FIG. 4.5.

When the cassette 8 is inserted through the cassette insertion port 11 of the device 110, the MA 12 and MB 13 wait backwards and come into contact with the metal lid 9 of the cassette 8, including the leaf springs Al or 1 and the leaf spring B2. Reframe leaf spring B2 5. or electrically connected to the cassette storage case 7,
Furthermore, since it is electrically connected to the metal chassis 5, static electricity flows to the leaf spring/l, the metal frame 4, and the metal chassis 5.
The electrostatic charge does not flow to the electronic components in this order, thereby preventing destruction of the electronic components due to static electricity.

[Effects of the Invention] According to the present invention, static electricity flowing from the metal lid of the cassette can be directed to the metal chassis by the plate spring, thereby preventing components inside the device from being damaged by static electricity when inserting the cassette with one hand. I can do it.

[Brief explanation of drawings]

FIG. 1 is a perspective view including a partial sectional view of an embodiment of the present invention;
Fig. 2 is a sectional view taken along line A-A of an embodiment of the present invention, and Fig. 3 is a cross-sectional view taken along line B
-B sectional view, FIG. 4 is a perspective view of one embodiment of the present invention, and FIG.
The figure is a sectional view taken along the line CC, and FIG. 6 is a perspective view including a partial sectional view of a conventional example. Explanation of symbols 1... Leaf spring A, 2... Leaf spring B, 3... Front panel, 4... Metal frame, 5... Metal chassis. 7... Cassette storage case, 8... Cassette, 9...
...Metal lid.

Claims (1)

[Claims] 1. A metal frame made of a metal material and connected to a metal chassis or case provided on the back side of a cassette insertion slot containing a disk of an optical or magneto-optical disk drive device with screws, lead wires, etc. Electrostatic discharge damage characterized by fixing one end of the resulting leaf spring by screwing, caulking, or sandwiching it, and making the other free end come into contact with a metal cassette lid when the cassette is inserted into the device. Prevention device. 2.Fix a leaf spring to the bottom of a storage case for a cassette containing a built-in disk of an optical or magneto-optical disk drive device, or to a unit base etc. equipped with an optical pickup, turntable, etc., by screwing, caulking, or inserting, etc. An electrostatic damage prevention device characterized in that the free end of the cassette comes into contact with a metal cassette lid when the cassette is inserted into the device. 3. The electrostatic device according to claim 1 or 2, characterized in that the free end of the leaf spring, that is, the part that contacts the metal cassette lid, is bent with a gentle radius and has a diaphragm with a gentle radius. Anti-destruction device. 4. In the device according to claim 1 or 2, the spring constant, size, shape, etc. of the leaf spring are set so that the contact resistance with the metal lid of the cassette is 0.5Ω or less. Prevention device.