JPH0416231Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a printed circuit board testing device, and particularly relates to an improvement of a circuit board holding structure.

[Technical background of the invention]

Conventionally, in a printed circuit board testing device, a board is placed on a board holder in which a large number of contact pins are implanted at predetermined positions, and the board is depressurized and suctioned toward the contact pins. Electrical continuity is then established between the wiring pattern of the printed circuit board, the soldered terminals of the components, and the contact pins. Then, each contact pin is led out to the outside, and a test is performed by measuring the resistance value between the pins, the voltage when power is applied, etc.

FIG. 1 is a sectional view showing an example of such a substrate holder, and 1 indicates upper, middle, and lower protruding pieces 1a, 1.
It is an aluminum profile with parts b and 1c protruding from each other. And each protruding piece 1a, 1 is made of this aluminum shape material.
b and 1c form a rectangular frame projecting inward. Then, a bed 2 made of acrylic, glass epoxy, or the like having an appropriate thickness is airtightly attached onto the lower protruding piece 1c. Contact pins 4 are implanted in the bed 2 at positions corresponding to the lead-out points of the wiring pattern of the printed circuit board 3 to be tested. Note that this contact pin 4 is elastically projected upward by a spring. A cushion 5 made of breathable sponge or the like is provided at an appropriate position on the bed 2. In addition, a ventilation hole 1d is provided on the side surface of the mold material 1, and the tube 6
It is connected to a suction device (not shown) via.

Then, a reinforcing epoxy resin substrate 7 and a rubber foam sheet 8 having a skin layer on the surface are placed on the cushion 5. The rubber foam sheet 8 having a skin layer on its surface is a so-called neocell molded material, which is extruded using a mold. Therefore, the surface of the finished rubber foam sheet 8 is a bubble-free skin layer with good slippage. This skin layer is generated during molding.
Note that the substrate 7 and the sheet 8 have through holes formed at positions corresponding to the contact pins 4, and the sheet 8
The edge thereof is arranged to face a sealing surface 1e formed on the upper surface of the middle protruding hole 1b of the mold material 1. This sealing surface 1e has a plurality of parallel grooves formed along the mold material 1.

[Problems with background technology]

However, in this type of work, precision processing is required in order to maintain airtightness when joining the rectangular shapes, and the work is troublesome. In addition, the cost of mold materials with such a special cross-sectional shape was high, which was a problem.

[Purpose of invention]

This idea was made in view of the above circumstances.
The object of the present invention is to provide a printed circuit board testing device that can obtain good airtightness without using expensive aluminum shapes, is easy to assemble, and can reduce costs.

[Summary of the idea]

That is, the present invention is characterized in that a printed circuit board is placed on a frame made of rubber foam having a skin layer on the tube-shaped surface, and the pressure inside the frame is reduced to suck and hold the printed circuit board. be.

[Example of idea]

Hereinafter, one embodiment of the present invention will be described in detail with reference to a sectional view of a substrate holder shown in FIG. Note that the first
The same parts as in the figures are given the same reference numerals and their explanations will be omitted. In the figure, 10 is a frame made of steel plate, aluminum plate, etc. This frame 10 has bet 2
is attached airtight. A rubber foam 11 having a tube-shaped surface and a skin layer is disposed around the periphery of the bed 2. The rubber foam 11 is bonded together with an adhesive or the like to form, for example, a rectangular frame. The inside of this frame communicates with the outside through, for example, a communication hole 2a formed in the bed 2, and a suction device (not shown) is connected thereto to reduce the pressure inside the frame.

The lower surface of the rubber foam 11 is hermetically bonded to the bed 2 with an adhesive or the like, and the epoxy resin substrate 7 and the rubber foam sheet 8 are stacked and placed on the upper surface. Then, the printed circuit board 3 to be tested is placed on the sheet 8. Note that contact pins 4 are implanted at predetermined positions on the bed 2, and through holes are bored in the substrate 7 in correspondence with the pins 4.

Therefore, the rubber foam 1 is inserted through the communication hole 2a.
When the pressure inside the frame 1 is reduced, the printed circuit board 3 is attracted, and the terminals of the wiring pattern and soldered parts come into contact with the pins 4 to establish electrical continuity. Therefore, the printed circuit board can be tested by measuring the voltage at predetermined pins, the resistance between the pins, and the like.

In addition, in FIG. 2, 12 is the printed circuit board 3.
A spacer 13 is a block that regulates the position of the printed circuit board 3 in the surface direction.

With this kind of structure, the cost can be significantly reduced compared to the one using an aluminum profile as shown in Figure 1, and rubber foam with a skin layer on the tube-shaped surface is inexpensive and easy to use. It has excellent flexibility, is easy to process, and can be firmly and airtightly bonded using an adhesive or the like. Then, when the pressure inside the frame is reduced, it deforms itself into a flat shape, making it possible to maintain even better airtightness.

It should be noted that the present invention is not limited to the above-mentioned embodiments; for example, in the above-mentioned embodiments, a tubular rubber foam with a rectangular cross section was used, but a rubber foam with a circular cross section may also be used. Further, the communication hole 2a communicating with the suction device may be formed in the bed 2 as shown in FIG. 2, or may be constructed by gluing a plate material 14 separate from the bed 2 as shown in FIG. Alternatively, communication holes may be provided not only on the sides but also below the bed 2.

[Effect of idea]

As described above, according to the present invention, it is possible to provide a printed circuit board testing device that is easy to process during assembly, reduces the overall cost, and can securely hold a printed circuit board.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a board holder of a conventional printed circuit board testing device, Fig. 2 is a sectional view showing one embodiment of the present invention, and Fig. 3 is a sectional view showing another embodiment of the present invention. FIG. 2...Bed, 3...Printed circuit board, 4...Contact pin, 7...Epoxy resin board, 8...
Sheet (rubber foam), 10... Frame, 11
...Tube-shaped rubber foam.

Claims (1)

[Scope of utility model registration request] A bed in which contact pins are implanted to make electrical continuity by contacting the printed circuit board to be tested;
A rubber foam having a skin layer on the tube-shaped surface placed on this bed and forming a frame, and a suction device that vacuums and suctions the printed circuit board placed on this rubber foam into the frame of the rubber foam. A printed circuit board testing device comprising: