CN1604722B

CN1604722B - Optical disc device

Info

Publication number: CN1604722B
Application number: CN 200410077052
Authority: CN
Inventors: 林哲也; 谷冈俊德
Original assignee: Teac Corp
Current assignee: Teac Corp
Priority date: 2003-10-01
Filing date: 2004-09-10
Publication date: 2010-08-18
Anticipated expiration: 2024-09-10
Also published as: TW200514304A; JP2005109355A; TWI252612B; CN1604722A

Abstract

To form a discharging path in a flexible printed wiring board, in order to prevent previously a static electricity received by the flexible printed wiring board from so flowing through the printed wiring board having mounted electronic components as to destroy the electronic components. In the flexible printed wiring board (FPC), there are so arranged in parallel with each other a plurality of conductive lines (L1, L2) made of metal foils as to form their end portions as connective terminals. Further, there is formed a window (FPC-W) for exposing to the external a portion of the grounding conductive line (L2) interposed between the connective terminals of the flexible printed wiring board (FPC), and the grounding conductive line (L2) facing the window (FPC-W) is so connected with a grounding line as to form a discharging path.

Description

Optical disc apparatus

Technical field

The present invention relates to make the discharge path effectively to get rid of the flexible printed wiring board of the static that influences electronic component etc. that produces at accurate electrical equipment etc. to form structure.

Background technology

Generally, accurate electrical equipment such as computer, audio-visual appliances, its electrical control division is carried out signal processing, data processing and output according to small-signal and is gone into control etc. by printed circuit board (PCB) (hereinafter referred to as the PCBA) formation that electronic components such as semiconductor integrated circuit element are installed.Again, be connected the situation between the multi-disc PCBA that device inside separates on electric, generally use flexible printed wiring board (hereinafter referred to as FPC).

Fig. 5 represents to adopt that this PCBA, FPC constitute in order to drive the optical disc apparatus of discs, for easy to understand the present invention, and the following summary of the structure of this device of explanation.

At Fig. 5, symbol 1 is the discs pallet that utilizes synthetic resin integrally formed, the rotary table 2 that is positioned at central portion be fixed in discs pallet 1 the driving shaft of built-in Spindle Motor 3, rotary head behind the centre bore of the chuck 4 chucking optical disk sheets that constitute with these rotary table 2 one.Move radially based on read head unit 5 court in discs pallet 1 formed slit 1a that optical picking-up head was constituted textural, to discs recording/reproducing information again.And the discs pallet 1 that is constituted after this manner is subjected to guide rail 6 and supports, and is concealed in casing 7.

This casing 7 is made of base plate 7a and cover plate 7b, and discs pallet 1 is at the inner space of integrated formation forward-reverse.And set PCBA1 in the rear portion side of base plate 7a, set PCBA2 at the back side of discs pallet 1.In this PCBA1 assembling according to the electronic component P such as semiconductor integrated circuit element that carry out data processing by the resulting small-signal of the recording/reproducing of discs, the PCBA2 assembling in order to the Spindle Motor 3 in the discs pallet 1 of mainly packing into, read head unit 5 etc. are carried out servo-controlled semiconductor integrated circuit element, in order to electronic components such as semiconductor integrated circuit element to discs recording/reproducing data.

At this PCBA1, PCBA2, assemble multi-link device MC1, MC2, connect the splicing ear of the end of FPC at this multi-link device MC1, MC2, because of with this FPC with PCBA1 and PCBA2 bridge joint on electric, can be between PCBA1 and PCBA2 receiving and transmitting signal.Be made as flexible state, make the mobile of the traceable discs pallet 1 in end is connected with the multi-link device MC2 of this FPC, but other parts utilize bonding agent or two-sided tape to be fixed in the bottom surface of base plate 7a.

And, as shown in Figure 6, the holding wire L1 and the earth connection L2 that roughly distinguish in the parallel formation of FPC.This holding wire L1 is connected with the electronic component P that assembles at PCBA1 via multi-link device MC1; And earth connection L2 is connected with base plate 7a via the fixed screw 8 of multi-link device MC1, is connected with the earthed circuit of system.(for example patent documentation 1).

[patent documentation 1] is special is willing to 2002-318324 number

Summary of the invention

So, general between the PCBA that will separate the situation of bridge joint often adopt FPC, be suitable for shown in above-mentioned optical disc apparatus situation with fixed part and movable part bridge joint.And, situation at optical disc apparatus, the PCBA2 that is set at the discs pallet that is movable part is in order to drive the SERVO CONTROL of system, utilize bigger current drives electronic component, but at the PCBA1 that is fixed in base plate 7a, factor is a main body according to Signal Processing, because of becoming the processing of small-signal, be vulnerable to electrostatic influence, to some extent the problem that is damaged of Zu Zhuan electronic component.

Especially, situation at optical disc apparatus, contact the metal part of the discs pallet of movable part because of people's finger, static flows into PCBA1 from movable part via FPC, on PCBA1, enter the signal system of PCBA2 again via FPC around the static of going into holding wire again, the first-class situation of picking up of destroying is also arranged from earth connection.Fig. 6 represents that static C flows into the influence at PCBA1 of the situation of FPC, flows at earth connection E though flow into the static C of FPC, and its part also flows into electronic component P, and electronic component P itself or the data of handling just are damaged.

On the easy solution of this problem, as shown in Figure 7, make the earth connection L2 contact base plate 7a of FPC, make static C directly flow to the earthed circuit of system, make can not flow into PCBA1.Therefore, as shown in Figure 7, utilize screw 9 that the part of the earth connection L2 of FPC is fixed in base plate, make base plate 7a and earth connection L2 short circuit, but the head of coping screw is outstanding from the bottom surface of base plate 7a, and the base plate of discs pallet 1 just touches the head of screw, bad on the generating mechanism.For fear of it, make the thickness of slab thickening of optical disc apparatus integral body, but and the slimming backward of optical disc apparatus, because of becoming big design alteration, in fact infeasible.

Again, utilizing fixed screw in mechanism, FPC to be carried out the situation of electrically conducting, in order to make its electric conductivity good, for example special opening shown in flat 8-203580 number the record, need carry out special shape at FPC and handle, the problems such as manufacturing expense rise that cause FPC are arranged.

Therefore, utilization of the present invention each means as described below solve above-mentioned problem.Promptly, invention is that a kind of discharge path of flexible printed wiring board forms structure, the parallel arrangement of many conductive paths that this flexible printed wiring board will be made of metal forming, the end is formed splicing ear, the fenestra that its characteristics are exposed for a part that forms the earthy conductive path between the splicing ear that makes this flexible printed wiring board makes to connect the earthy conductive path that faces this fenestra to grounded circuit.

According to These characteristics, the present invention utilizes the conductivity bonding agent to connect the earthy conductive path of this fenestra to grounded circuit.

According to These characteristics, the present invention utilizes the conductivity two-sided tape to connect the earthy conductive path of this fenestra to grounded circuit.

According to These characteristics, the present invention connects this solder flux to grounded circuit and electroplates after the earthy conductive path of this fenestra carries out the solder flux plating.

Description of drawings

Fig. 1 is the stereogram of major part of the enforcement state of embodiments of the invention one;

Fig. 2 is the cutaway view in order to explanation embodiments of the invention one;

Fig. 3 is the cutaway view in order to explanation embodiments of the invention two;

Fig. 4 is the cutaway view in order to explanation embodiments of the invention three;

Fig. 5 is the stereogram in order to the structure of explanation optical disc apparatus;

Fig. 6 is in order to explanation bad plane graph in the past;

Fig. 7 is the plane graph in order to explanation bad solution example in the past.

The component symbol explanation

The discs pallet

Rotary table

Spindle Motor

4 chucks

5 read head unit

Guide rail

7 casings

The 7a base plate

The 7b cover plate

8 fixed screws

The P electronic component

The FPC flexible printed wiring board

L1 holding wire L1

The L2 earth connection

The F1 counterdie

The F2 diaphragm

G3 solder flux plated portions

The PCBA1 printed circuit board (PCB)

The PCBA2 printed circuit board (PCB)

The multi-link device of MC1

The multi-link device of MC2

The FPC-W fenestra

Embodiment

The present invention is adapted at connecting the situation that the Wiring construction of FPC and PCBA is implemented, and You Hai electrostatic protection electronic component certainly can improve the reliability of device.

Embodiment one

Below, describe embodiments of the invention in detail according to figure.In addition, for investing identical symbol description with identical construction in the past.

Fig. 1 represents the stereogram of major part of the enforcement state of embodiments of the invention one, at Fig. 1, at the FPC that is connected with the multi-link device MC1 of PCBA1, forms the fenestra FPC-W in order to make earth connection L2 expose at its back side.Promptly; FPC generally as shown in Figure 2; utilize the counterdie F1 and the diaphragm F2 of insulating properties to seal, but form fenestra FPC-W, remove the state of insulation of this part by a position or a plurality of position of the arbitrary decision on the earth connection L2 of this counterdie F1 with the conductive path of layer-by-layer state with metal forming.In addition, about the formation of this fenestra FPC-W, make the manufacture craft of FPC integral body form also can, make after FPC finishes the important place of counterdie F1 peeled off and also can.

Secondly, the formed fenestra FPC-W of FPC as noted above smears conductivity bonding agent G1 shown in Fig. 2 (A) after, utilize bonding agent or two-sided tape S that counterdie F1 is sticked at base plate 7a.Thereby, shown in Fig. 2 (B),, form the circuit toward base plate 7a from earth connection L2 because of conductivity bonding agent G1 sticks at base plate 7a, can be with the static guiding base plate 7a that FPC accepted.

Embodiment two

Embodiments of the invention two, the gluing use conductivity two-sided tape G2 because of making at FPC as shown in Figure 3, when sticking FPC on base plate 7a, forms the circuit from the past base plate 7a of the earth connection L2 of this fenestra FPC-W, can be with the static guiding base plate that FPC accepted.

Embodiment three

Embodiments of the invention three are shown in Fig. 4 (A), to carrying out utilizing bonding agent or two-sided tape S that counterdie F1 is sticked at base plate 7a after solder flux electroplates G3 at the earth connection L2 that the fenestra FPC-W of FPC exposes in advance.Thereby, shown in Fig. 4 (B),, form the circuit toward base plate 7a from earth connection L2 because of solder flux plated portions G3 contacts with base plate 7a, can be with the static guiding base plate that FPC accepted.

If according to the present invention, because of the earthy conductive path of FPC can be made as and the stationary state of the same in the past FPC under the grounded circuit that installs is connected, can not take place for the constructivity problem of installing.Again, do not need retaining element etc.,, can hang down improveing of expense, and make assembling operation become easy because of simplifying joint construction.

Claims

1. optical disc apparatus possesses in order to drive discs, it is characterized by:

Spindle Motor is fixed in driving shaft with rotary table;

The read head unit is for discs recording/reproducing information;

The discs pallet has first printed circuit board (PCB);

Casing is equipped with second printed circuit board (PCB), and by this discs pallet that guide rail supported portion space forward-reverse within it; And

Flexible printed wiring board, the parallel arrangement of many conductive paths that will constitute by metal forming, the one end is connected with this first printed circuit board (PCB), and its other end is connected with this second printed circuit board (PCB), the end that is connected with this first printed circuit board (PCB) is made as flexible state, moving of this discs pallet of enables trace, then gluing is fixed in this casing to remaining part by pasting the conductivity two-sided tape, fenestra in that a part that forms the earthy conductive path between the splicing ear that makes this flexible printed wiring board for the gluing face of this casing is exposed makes the earthy conductive path that faces this fenestra contact this casing and ground connection.