JPH0498164A - Inspection method for printed wiring board - Google Patents

Abstract

PURPOSE:To inspect conduction of each wiring with a simple constitution, by connecting an inspection object printed wiring board and an auxiliary printed wiring board having test wiring, through pressure welding of an electroconductive rubber sheet which is conductive only in the thickness direction. CONSTITUTION:An auxiliary printed wiring board 3 which is provided with through holes 6 at places opposing to the starting and ending positions of respective signal patterns 5 on a base board, and short circuit patterns 7 by which signal patterns 5 on the wiring board 1 come under a series connection relation through through-holes 6, is made. And an electroconductive rubber sheet 2 having conductivity only in the thickness direction is inserted between the inspection object board 1 and the board 3, and pressure welding is done. As a result, at patterns 5, the whole wiring is connected in series, and a simultaneous electroconduction test of all the wirings becomes possible by arranging contact probes 10 at check points 8, 9. As a result, check points can be reduced, and inspection cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a continuity testing method for printed wiring boards.

[Conventional technology]

The conventional continuity test method of this type is as shown in Figure 3.
The starting and ending points of each wiring of the printed wiring board 1-1- to be inspected (
A dedicated jig 4 was prepared in which contacts 11 and coves 10 were arranged corresponding to the through-holes or lands, and continuity tests were conducted on each wiring (signal pattern).

[Problem to be solved by the invention]

In the conventional inspection method described above, contact probes are specially provided at the start and end points of each wiring on the printed wiring board to be inspected, so it is necessary to create an individual dedicated jig for each printed wiring board. This has the disadvantage that the cost is enormous and, by extension, the cost of the printed wiring board increases.

[Means to solve the problem]

The method for inspecting a printed wiring board of the present invention is to inspect the printed wiring board to be inspected between each start and end point positioned corresponding to the start and end point positions of each mutually insulated wiring on the printed wiring board to be inspected. It is equipped with an auxiliary printed wiring board having test wirings insulated from each other and connected in correspondence so that the wirings on the top are connected in series, and a conductive rubber sheet on a flat plate that is conductive only in the thickness direction. , the printed wiring board to be inspected and the auxiliary printed wiring board are pressed together via the conductive rubber sheet, and the corresponding start and end points of each wiring are connected to each other, so that each wiring of the printed wiring board to be inspected and the auxiliary printed wiring board are connected to each other. This configuration tests the continuity of each wiring of the printed wiring board to be inspected by checking the continuity between both ends of a path formed by alternately connecting test wirings of the auxiliary printed wiring board in series.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic longitudinal sectional view of one embodiment of the present invention, which is composed of a printed wiring board 1, a conductive rubber sheet 2, an auxiliary printed wiring board 3, and an inspection jig 4. FIG. Also, the second
The figure represents a perspective view of each wiring board in FIG. 1.

For example, when conducting a continuity test on the printed wiring board 1, a through hole 6 is placed at a location opposite to the starting and ending point positions of each signal pattern 5 on the board, and the signal pattern 5 on the printed wiring board 1 is connected in series from the through hole 6. An auxiliary printed wiring board 3 provided with a short circuit pattern 7 that has a connection relationship.
A thickness direction (direction A in Fig. 1) is created between the printed wiring board 1 to be inspected and the auxiliary printed wiring board 3.
By inserting and press-contacting the conductive rubber sheet 2 having conductivity only to the signal pattern 5, all the wiring lines of each signal pattern 5 are connected in series. Therefore, if the contact probes 10 are placed at eight test points at both ends where all the wirings are connected in series, it is possible to test the continuity of all the wirings at the same time.

〔Effect of the invention〕

As explained above, the present invention has an inspection configuration in which a conductive rubber sheet is pressed between a wiring board to be inspected and an auxiliary printed wiring board having wiring for connecting each wiring on this wiring board in series. By doing so, the number of inspection points can be drastically reduced, and the inspection cost can also be significantly reduced. Furthermore, it has the effect of contributing to reducing the cost of printed wiring boards.

probe.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical sectional view of an embodiment of the present invention, FIG. 2 is a perspective view showing the wiring relationship between the printed wiring board to be inspected in FIG. 1 and the auxiliary printed wiring board, and FIG. 3 is a schematic longitudinal sectional view of a conventional inspection method.

Claims (1)

[Claims] Each wiring on the printed wiring board to be inspected is connected in series between each starting and ending point positioned corresponding to the starting and ending point position of each mutually insulated wiring on the printed wiring board to be inspected. An auxiliary printed wiring board having respective test wirings insulated from each other and connected in correspondence with each other, and a conductive rubber sheet on a flat plate that is conductive only in the thickness direction, and the test object is The printed wiring board and the auxiliary printed wiring board are pressed together and the corresponding start and end points of each wiring are connected to each other, and each wiring of the printed wiring board to be inspected and each test wiring of the auxiliary printed wiring board are connected. A method for inspecting a printed wiring board, characterized in that continuity of each wiring of the printed wiring board to be inspected is tested by checking continuity between both ends of paths formed by alternately connecting in series.