JPS6361966A - Board circuit inspecting method for continuity of wired utilizing pressurized conductive rubber - Google Patents

Abstract

PURPOSE:To eliminate the flawing of a gold-plated terminal part made of a conductive pin by placing pressurized conductive rubber on a gold-plated terminal, fitting metallic projections on their top surfaces corresponding to the respective gold-plated terminals, and inspecting the top and reverse surfaces of the gold-plated terminals at the same time. CONSTITUTION:The metallic projections 8 are fitted on the top surface of the pressurized conductive rubber 6 matching with the pitch of the gold-plated terminals 2, and placed on the top surfaces of the gold-plated terminals 2 and pressed by a press plate so that the pressure is increased locally. Consequently, the terminals and projections 8 conduct to each other to take a continuity test. When the gold-plated terminals 2 on the top and reverse surfaces are inspected at the same time, two jigs for fitting the conductive rubber 6 to the top and reverse surfaces of the wired board by the same system are used; and a conduction pin 5 for inspecting the conductive rubber 6 and a general through hole part for the inspection of the gold-plated terminals 2 are implanted in the lower jig and only the conductive rubber 6 for inspecting the upper gold-plated terminals 2 is fitted to the upper jig. Then they are pressed on a press machine and the conductive rubber 6 and conduction pin 5 are brought into contact with this product at the same time from above and below the wired board.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a wiring board inspection method.

(Prior art) There is a method of electrically detecting circuit defects such as disconnections and short circuits on wiring boards using a continuity tester.
! 11′? ! :The usual method is to use a conductive pin.

FIG. 3 is an explanatory diagram of a state in which a wiring board 1 to be inspected is sandwiched between press plates 7, and this wiring board is shown in FIG. The wiring board 1 has gold-plated terminals 2 on the front and back sides. In this circuit, disconnections 3 or short circuits 4 occur due to etching defects. To detect such defects, a continuity test is performed by contacting the gold-plated terminal 2 using a continuity pin 5 (FIG. 4) of a continuity tester.

(Problems to be Solved by the Invention) Under the above inspection conditions, since there are high-density gold-plated terminals on the front and back of the wiring board, it is difficult to align the conductive pins with the gold-plated terminals with good precision (difficult to align). It is.

In addition, not only can the gold-plated terminal 2 be damaged by the conductive pin, resulting in a defect, but also the gold-plated terminal 2 is often not on the standard grid, so it cannot be used with a general 100 mil universal continuity tester. At the same time, connect gold-plated terminals 2 on the front and back to 8
It is impossible to test by

(Means for Solving the Problems) In view of the above-mentioned problems, the present invention, which was obtained as a result of study, is a method that makes it possible to detect circuit defects by causing the product circuit section to monitor the full pressure of the four electric rubbers. be.

The present invention will be explained using figures. FIG. 1 is an enlarged sketch of a jig using pressurized conductive rubber.

The upper surface of the pressurized conductive rubber 6 is pressurized with a press plate 7.

In this case, in order to partially strengthen the pressure on the upper surface of the pressurized conductive rubber 6, attach the gold PA protrusions 8 so as to match the pitch of the gold-plated terminals. Furthermore, this metal protrusion 8 and the connector of the continuity tester are connected by wiring. Next, when the press 7 is pressed, the gold-plated terminal 2 and the metal protrusion 8 are electrically connected, making it possible to conduct a continuity test.

In addition, in order to be able to inspect the gold-plated terminals on the front and back sides of the wiring board at the same time, it is possible to make two sets of jigs for attaching the pressurized conductive rubber 6 to the top and bottom surfaces of the wiring board in the same way, and to inspect both sides. Same FI? FVC test can be done.

The method is shown in Figure 2.

The lower jig holds pressurized conductive rubber for inspecting gold-plated terminals and a conductive bottle for inspecting general through-hole sections. In addition, we prepared a jig to which only the pressurized conductive rubber was attached in order to inspect all the gold-plated terminals on the upper side of the upper jig, set it in the press machine, and simultaneously applied the pressurized conductive rubber to this product from the top and bottom of the distribution plate. Make full contact with the conductive bottle.

(Function) When pressure is applied to the pressurized 4-electric rubber used in the present invention, only the pressurized portion becomes electrically conductive in the compression direction.

Therefore, in FIG. 1, a pressurized conductive rubber 6 is placed on the gold-plated terminal VcW, and a metal protrusion 8 is placed on the top surface of the pressurized conductive rubber 6. !
- Attach it corresponding to each gold-plated terminal and press it from above with the press plate 7. As a result, pressure is applied locally between the metal protrusion and the gold-plated terminal, resulting in electrical continuity.

(Effect of the invention) The effects obtained by the method of the present invention are listed below.

(1) Scratches that occur on the gold-plated terminals due to the four-pin pin are eliminated.

(2) It is now possible to inspect high-density pitch gold-plated terminals, which is impossible with conductive pins.

(3) Conventionally, it was necessary to make a hole in the conduction jig for embedding the conduction bottle, but with the present invention, this is not necessary and the manufacture of the conduction jig is simplified.

[Brief explanation of drawings]

Figures 1.2.3 are perspective views for explaining the use of conductive rubber, Figure 4 is a front view of a 2s through bottle, and Figure 5 is a perspective view of a damaged gold-plated terminal. 1 Wiring board 2 Gold plated terminal 3 @ wire 4 Short circuit 5 Continuity bottle 6 Pressure 4 Electric rubber 7 Blend board 8 Metal protrusion 1st circle 3 diagram

Claims (1)

[Claims] 1. A wiring board is sandwiched between two press plate-like jig plates, and a pressurized conductive rubber plate is sandwiched between the terminal part of the wiring board and the jig plate, and each terminal of the pressurized conductive rubber plate is corresponded to 1. A circuit continuity testing method for a wiring board, characterized in that metal protrusions are arranged at positions where the wiring board is pressed, and the conductivity generated in the compression direction of the pressurized conductive rubber is utilized when the wiring board is pressed by the jig plate.