JPH052867Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a double-sided inspection device for printed circuit boards.

[Prior Art] Generally, before elements such as transistors, diodes, and resistors are incorporated into a printed circuit board, it is necessary to inspect whether or not leads of a desired pattern are formed. This inspection is performed on a conductive part (hereinafter referred to as "conductive part to be inspected") formed on a printed circuit board for mounting an element.
This is done by checking whether there is continuity between the two.

Conventionally, general-purpose inspection equipment used to perform this type of inspection has been designed to measure the basic arrangement pattern of the conductive parts to be inspected on the printed circuit board to be inspected, that is, for example, regularly in the vertical and horizontal directions with a pitch of 2.54 mm or 1.27 mm. Inspection terminals made of metal pins, such as spring probes, are arranged in correspondence with the set of arranged lattice points (hereinafter simply referred to as "basic lattice"), and the conductivity of this inspection terminal and the printed circuit board to be inspected is It is known to test the electrical continuity of the conductive parts to be tested or the insulation state between the conductive parts by bringing them into electrical contact with each other. However, in recent years, with the miniaturization of electric and electronic equipment, the conductive parts to be inspected on printed circuit boards have become densely formed, and some of the conductive parts are displaced with respect to the basic grid. Many printed circuit boards are used, and it is difficult to reliably inspect such types of printed circuit boards using the above-mentioned inspection apparatus.

Furthermore, with recent advances in surface mounting technology, various elements have come to be mounted on both sides of a printed circuit board, and it has therefore become necessary to inspect both sides of the printed circuit board. However, in the past, both sides could not be inspected at the same time, and each side had to be inspected one by one. Therefore, there was a problem that the inspection required a long time and furthermore, it was not possible to inspect all the patterns to be inspected.

[Problems to be Solved by the Invention] As described above, with the conventional apparatus, it has not been possible to simultaneously and reliably test the conductive parts on both sides of a printed circuit board.

The present invention solves these conventional problems and provides a double-sided inspection device for printed circuit boards that is easy to manufacture, has excellent productivity, is highly reliable, and can accurately and easily set the positional relationship between connected electrodes. The purpose is to provide

[Means for Solving the Problems] In order to achieve such an objective, the present invention includes a terminal holding plate having detection terminals located corresponding to the basic grid of the printed circuit board to be inspected; Electrodes are provided at positions corresponding to grid points on one surface that is located between the printed circuit board to be inspected and faces the terminal holding plate, and electrodes are provided at positions corresponding to the grid points on the other surface. A plurality of electrodes are provided at positions corresponding to the conductive parts, each of which is electrically connected to one of the electrodes on one surface, and the surface of the electrode is electrically conductive only in the thickness direction when pressure is applied or when no pressure is applied. A first elastic body provided with an elastic body having
a first intermediate electrode body having an intermediate electrode plate; and a printed circuit board to be inspected which is located on the opposite side of the printed circuit board to be inspected and which faces the printed circuit board to be inspected. Electrodes are provided at positions corresponding to the conductive parts to be inspected on the surface,
A plurality of electrodes are provided on the other surface and are electrically connected to one of the electrodes on one surface, and the electrode surface has electrical continuity only in the thickness direction when pressure is applied or no pressure is applied. The second part is provided with an elastic body.
a second intermediate electrode body having an intermediate electrode plate;
a multilayer wiring board connected to each of the electrodes on the other surface of the second intermediate electrode plate via wiring, and each electrode on the surface of the second intermediate electrode plate via the wiring of the multilayer wiring board; A connector having a plurality of terminals connected to a detection terminal.

[Function] According to the present invention, it is possible to obtain highly reliable electrical continuity and simultaneously inspect both sides of a printed circuit board.
Furthermore, it is possible to provide a printed circuit board inspection device that is easy to manufacture.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram illustrating an embodiment of the present invention. In the figure, 1 is a printed circuit board to be inspected, and conductive parts 1A and 1B to be inspected are provided on both sides of the printed circuit board. 1C is a through hole. 2 is a terminal holding plate, which is made of an insulating material such as acrylic resin, phenolic resin, or epoxy resin, and has terminal holding holes on its surface at intervals corresponding to the basic grid of the printed circuit board 1 to be inspected, for example, 2.54 mm. Rivet-shaped detection terminals 2A are inserted and held in each of the terminal holding holes in a state where the terminals 2A are exposed at the head thereof. 3 is a first intermediate electrode body, and in this embodiment, it is made of an intermediate electrode plate 31 and first and second elastic bodies 32 and 33 that have conductivity only in the thickness direction when pressure is applied or when no pressure is applied. It's summery. As shown in the figure, a plurality of through holes 31A are provided in the intermediate electrode plate 31 at intervals corresponding to the detection terminals 2A. and the first elastic body 3
2, that is, the surface facing the terminal holding plate 2, an electrode 31B is provided at the position of the through hole 31A.
The printed circuit board 1 to be inspected via the elastic body 33 of
A through hole 3 is provided on the surface facing the printed circuit board 1 at a position corresponding to the conductive part 1A to be inspected.
The electrode 31C is electrically connected to the electrode 31B and the wiring 31D via the wiring 31A, and the wiring 3
An insulating layer 31E is provided to insulate and cover 1D. The first intermediate electrode plate 31 is a substrate having through holes made of polyimide resin, polyester resin, epoxy resin, etc., or a resin reinforced with glass fiber or the like, and is preferably a flexible substrate. Anisotropic conductive rubber as the first and second elastic bodies 32 and 33;
Pressure-sensitive anisotropically conductive rubber is used. Further, as the insulating layer 31E, a commercially available solder resist, liquid resist, or the like is used.

The second intermediate electrode body 4 consists of an intermediate electrode plate 41, and first and second elastic bodies 42 and 43 that have conductivity only in the thickness direction when pressure is applied or not. 41A is a through hole provided in the intermediate electrode plate 41, and 41B is the conductive part 1 to be inspected of the printed circuit board.
An electrode provided at a position corresponding to B, 41C is an electrode provided on the opposite side to electrode 41B, and 41D
is connected to the electrodes 41B and 41 through the through hole 41A.
Wiring 41E is the wiring 41 that electrically connects C.
This is an insulating layer for insulating coating D. Electrode 41
It is preferable to arrange C at a position corresponding to the above-mentioned basic lattice for connection with a wiring board to be described next. Reference numeral 5 denotes a wiring board, and connection electrodes 5A are provided on the surface in contact with the elastic body 43 at positions corresponding to the electrodes 41C, and each electrode 5A is led to the connector 6 via a wiring 5B. The multilayer wiring board 5 is made of polyimide resin, polyester resin, epoxy resin, etc.
Alternatively, a flexible wiring board made of a resin reinforced with glass fiber or the like is preferable. The connector 6 is an insulating pin housing 6
Conductor pin 6B loosely fitted in A, conductor pin 6B
It consists of elastic bodies 6C and 6D provided above and below. Elastic bodies 6C and 6D are elastic bodies 32, 33, 4
It is an elastic body having conductivity only in the thickness direction when pressure is applied or when no pressure is applied, similar to No. 2 and 43. Conductor pin 6
B has nickel, gold, etc. on the surface of copper, silver, etc.
They are plated with a noble metal such as silver, and although only one is shown for convenience of illustration, the same number or more as the electrodes 41C are provided. 7 is a measuring device, and the end opposite to the detection terminal 2A is electrically connected to a test circuit within the measuring device 7. 8 is a positioning and pressurizing table.

Wiring board 5, second intermediate electrode body 4, printed circuit board 1, first intermediate electrode body 3, and connector 6 are placed on table 8 as shown in the figure, and after alignment, table 8 is raised. A conductive path is formed from the test conductive part 1A → elastic body 33 → electrode 31C → wiring 31D → electrode 31B → elastic body 22 → detection terminal 2A, and one of the conductive parts to be tested 1B → elastic body 42 → electrode 41B → wiring 41D→electrode 41C→
Elastic body 43 → electrode 5A → wiring 5B → elastic body 6D →
A conductive path from the conductor pin 6B to the elastic body 6C to the detection terminal 2A is formed. Therefore, the conduction state or insulation state between the conductive parts 1A and 1B to be tested on both surfaces of the printed circuit board 1 can be tested simultaneously.

As in this embodiment, a through hole is provided in each intermediate electrode plate at a position corresponding to the basic grid, and an electrode is provided on the surface facing the printed circuit board at a position corresponding to the conductive part to be inspected on the printed circuit board. Then, the intermediate electrode plate can be easily manufactured. Further, if the connector is constructed of the conductor pin 6B and the elastic bodies 6C and 6D having conductivity only in the thickness direction, the degree of freedom in the horizontal direction of connector arrangement is increased, and errors in the thickness direction can be absorbed.

FIG. 2 is a partial cross-sectional view of an embodiment of the invention.
In the figure, reference numerals 9 and 10 indicate an intermediary plate provided between the second intermediate electrode body 4 and the wiring board 5, and an elastic body having conductivity only in the thickness direction when pressure is applied or when no pressure is applied. The intermediary plate 9 consists of an insulating terminal holding plate 9A and a conductor terminal 9B loosely fitted into a hole provided in the holding plate 9A at a position corresponding to the electrode 41C. Since both the upper and lower ends of the terminal 9B are made to protrude from the terminal holding plate 9A, the conduction between the electrode 41C and the electrode 5A can be more ensured. Reference numeral 11 is an elastic body such as a sponge, which serves to absorb distortion and ensure continuity when the printed circuit board 1 is not flat.

The connector 6 in the above embodiment can also be replaced with a spring probe type connector. It is also possible to connect the connector 6 to the terminals of other measuring devices.

[Effects of the invention] As explained above, the invention provides a printed circuit board inspection device that can obtain highly reliable electrical continuity, can simultaneously inspect both sides of a printed circuit board, and is easy to manufacture. can do.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an outline of one embodiment of the present invention, and FIG. 2 is a sectional view showing an enlarged main part of another embodiment of the present invention. 1... Printed circuit board, 1A, 1B... Conductive part to be inspected, 2... Terminal holding plate, 2A... Detection terminal,
3, 4... Intermediate electrode body, 5... Multilayer wiring board, 5B
...Wiring, 6...Connector, 6B...Pin, 6
C, 6D...Elastic body, 7...Measuring device, 8...Positioning table, 9...Intermediate plate, 10...Elastic body, 11...Sponge, 31, 41...Intermediate electrode plate, 31A, 41A ...Through hole, 31B,
31C, 41B, 41C... Electrode, 32, 33,
42, 43...Elastic body.

Claims (1)

[Claims for Utility Model Registration] A terminal holding plate having detection terminals located corresponding to the basic grid of the printed circuit board to be inspected; On one surface facing the holding plate, electrodes are provided at positions corresponding to the grid points, and on the other surface, electrodes are provided at positions corresponding to the conductive parts to be inspected on the opposing printed circuit board surface. A plurality of electrodes are provided that are electrically connected to one of the electrodes on the surface of the electrode, and an elastic body that is electrically conductive only in the thickness direction when pressure is applied or not is provided on the surface of the electrode. a first intermediate electrode body having a first intermediate electrode plate; a first intermediate electrode body located on the opposite side of the first intermediate electrode body of the printed circuit board to be inspected, and opposite to one surface facing the printed circuit board to be inspected; electrodes are provided at positions corresponding to the conductive parts to be tested on the surface of the printed circuit board to be tested, and a plurality of electrodes are provided on the other surface to be electrically connected to one of the electrodes on the one surface, and a second intermediate electrode body having a second intermediate electrode plate provided with an elastic body having electrical continuity only in the thickness direction when pressurized or not pressurized, on the surface of the electrode; a multilayer wiring board connected to each of the electrodes on the other surface of the second intermediate electrode plate via wiring; A double-sided inspection device for a printed circuit board, comprising: each electrode; and a connector having a plurality of terminals connected to the detection terminal.