JPS62162979A - Individual air cylinder type universal fixture - Google Patents

Abstract

PURPOSE:To realize a fixture which has a high-density contact probe and to use different kinds of package substrates which differ in package position by pressing the package surface of a package substrate uniformly by individual cylinders with high pressure. CONSTITUTION:A main fixture body 11 is constituted by arraying cylinder bodies 12 which have vertical extensible contact probes 13 in a matrix. A member 14a is provided to the inner periphery of the main body 11 through a member 14b and a spring 15, and equipped with a mount base 14c where a package substrate 16 having package parts 17 is mounted. Further, a support member 18 where a number of individual air cylinders 19 are coupled and fixed is arranged above the main body 11. Further, pistons 20 which are moved up and down with air sent through a conduit 21 are incorporated in the cylinders 19. Then, the cylinders 19 operated during a test to press the package substrate 16 and package parts 17 uniformly by tip parts 20a of the pistons 20, thus obtaining the main body 11 which has the contact probes 13 with high density.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fixture such as an in-circuit tester (printed wiring board inspection machine).

As is well-known, an in-circuit tester measures the electrical connection relationship between two arbitrary terminal areas of each printed wiring board (hereinafter abbreviated as a mounted board), that is, the electrical connection between two points + one terminal area of the printed wiring board (hereinafter abbreviated as a mounted board) It has the function of inspecting whether it is in a normal electrical connection or in an insulating state, and identifying those that are not in a normal electrical connection. Here, the state of the wiring pattern that constitutes the mounting board to be inspected, that is, the arrangement of the terminal area group, varies widely, and this is because the grid spacing that determines the terminal area is unified to a certain standard. This is due to the fact that various grid pitches have been put into practical use as standards, and that a single type of printed wiring board contains a variety of lattice pitches.

Therefore, in principle, a dedicated fixture is required for each printed wiring board to be inspected. In order to avoid this problem, the standard, for example, 2.54mm
Using an inspection machine equipped with pitch grid points as a reference, various types of printed wiring boards were inspected by selectively replacing the adapters used for each type of mounting board to be inspected. .

Here, in order to achieve accurate inspection of the mounted board, each terminal area of the mounted board must be connected to a contact probe that is retractably disposed on fixture 1, or a contact probe when an adapter is used. There are 7 pins that connect well with the adapter pins. The present invention relates to a general-purpose fixture for obtaining such a good connection.

Conventional technology Conventionally, this type of fixture was connected to the contact probe from the back side of the mounting board by pressing the mounting board against the board from above with a stick, or by sucking the mounting board with a vacuum cleaner. .

Problems to be Solved by the Invention However, in the above-mentioned conventional fixtures,
With the method of pushing from above with a barb, it is difficult to cut the length of the part according to the height of the part, so it can only be pushed where there are no parts, and with the method of pushing with the suction force of a vacuum, it is difficult to produce a large force. First, there is a drawback in that it is difficult to make electrical contact with a fixture having a high density of contact probes.

The present invention has been made in view of the above-mentioned conventional circumstances, and
Therefore, it is an object of the present invention to make it possible to eliminate the above-mentioned drawbacks inherent in the prior art. Our goal is to provide a modern, general-purpose fixture.

Means for Solving the Invention In order to achieve the above object, a general-purpose fixture according to the present invention is configured with a number of individual air cylinders for pushing a mounting board from above.

According to the present invention, an individual air cylinder system is used so that the presence or absence of components and differences in component height can be pressed with the same pressure, and even with a weak force that does not damage the mounted components, a large number of components can be pressed. Because the entire unit can be pressed uniformly with high pressure using an air cylinder, it is now possible to obtain electrical contact even with fixtures that have a high density of contact probes.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the present invention.

In FIG. 1, reference numeral II indicates a fixture body, and a cylindrical body 12 provided with contact probes I3 that can be expanded and contracted up and down is arranged in the fixture body 11 in a grid pattern. A member 14a is attached to the inner periphery of the fixture 11.
is provided via member +4b and spring 15, and member 1
4a is a mounting board 1 to be tested on which a mounting component 17 is mounted;
A mounting table 14c on which 6 is mounted is attached.

A support member 18 that is indirectly connected and fixed to the fixture 11 at the upper part of the fixture 11 has a large number of individual air cylinders! 3 is arranged, and a conduit 2 is disposed inside the cylinder 19.
A piston 20 that moves up and down by air sent through 1
is built-in. During a test, when the mounted board 16 under test is placed on the mounting table 14c and the air cylinder 19 is operated, the tip 20a of the piston 20 uniformly presses the mounted board 16 and the mounted components 17, Therefore, each terminal area of the mounting board 1B has a corresponding contact probe! 3 can be brought into precise close contact.

As described in detail, according to the present invention, the mounting surface of the mounting board can be pressed uniformly and with high pressure using the individual air cylinders, thereby making it possible to realize a fixture with a high density of contact probes and adjusting the mounting position. FIG. 1 is a sectional view of the present invention, which shows the effect that it is possible to realize a general-purpose fixture that can be used in common with different types of mounting boards having different characteristics.

Claims (1)

[Claims] In a fixture such as an in-circuit tester that tests a mounted board, a large number of individual air cylinders are arranged on the top of the fixture, and the large number of individual cylinders are used to test the mounted board under test placed on the fixture. An individual air cylinder type general-purpose fixture that presses the entire mounting surface with uniform high pressure and enables electrical contact even with fixtures with high density contact probes.