JPH07294552A - Continuity inspection jig for printed-wiring board - Google Patents

Abstract

PURPOSE:To reduce the cost of a continuity inspection jig by simplifying the structure of a probe. CONSTITUTION:A probe holding board 11 which holds a probe 20 via the support coupling of a socket 22 and a pin-guide board 13 which guides the tip part of a contact pin 21 for the probe 20 so as to be passed, are installed t>y keeping an interval, and a sponge material 15 in which the contact pin 21 exists in extended state and which is frictionally joined with the e contact pin 21 so as to be immovable and which is made of a foamed plastic or the like is filled into a space part between both boards. In addition, a pin contact member 23 with which the base end of the contact pin 21 comes into contact and a spring 24 which energizes the pin contact member 23 so as to come into contact with the base end of the contact pin 21 are built in the socket 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuity inspection jig for a printed wiring board, and more particularly to a contact pin whose tip contacts a continuity inspection portion of the printed wiring board, and a contact pin which is elastically retractable and attached at the base end. Continuity test including a probe having a socket for connecting a lead wire to a portion, a probe holding board for holding the probe through supporting engagement of the socket, and a pin guide board for guiding the tip end of the contact pin of the probe through It relates to the improvement of jigs.

[0002]

2. Description of the Related Art As shown in FIG. 2, in a conventional continuity inspection jig of this type, a contact pin 32 is elastically attached to a pin holding (inserting) tube 34 having a spring 35 through a bulging base portion. A probe in which the tip end portion of the contact pin 32 is elastically retractable and protruded from the tip end portion of the socket 33 by a double insertion structure in which the pin holding tube 34 is inserted so as to be retractable and the pin holding tube 34 is inserted into the socket 33. 31 is formed, and the probe 31 is attached to the mounting hole 1 of the probe holding board 11.
The tip of the contact pin 32 is held by mounting the tip of the socket 33 to the socket 2, and the tip end of the contact pin 32 is projected to the surface side of the pin guide board 14 through the guide hole 14 of the pin guide board 13 that is assembled on the probe holding board 11. In this way, it is possible to press the conductive inspection portion of the printed wiring board.

[0003]

However, the probe 31 including the contact pin 32, the pin holding tube 34 and the socket 33 is a means having an extremely small diameter corresponding to the interval of the inspection portion of the densified printed wiring board. Therefore, there is a problem in that it is difficult to manufacture, the cost is extremely high, and if the contact pin 32 is damaged, at least the pin holding tube 34 must be replaced, which is uneconomical.

In view of the above problems, the present invention simplifies the structure of the probe so that the number of constituent members can be reduced and only the contact pins can be replaced.
The purpose is to reduce the cost of the continuity inspection jig.

[0005]

According to the present invention, in order to achieve the above object, a contact pin whose tip contacts a continuity inspection portion of a printed wiring board and a contact pin are elastically retractable. And a probe having a socket for connecting a lead wire to the base end, a probe holding board for holding the probe through supporting engagement of the socket, and a pin guide board for guiding the tip end of the contact pin of the probe through. In the provided printed wiring board continuity inspection jig, place the probe holding board and the pin guide board at a distance, and extend the middle part of the contact pin between the probe holding board and the pin guide board and make contact. A pin contact member in which a sponge material that is frictionally engaged with the intermediate portion of the pin so as to be relatively immovable is loaded, and the base end of the contact pin contacts the socket. Incorporating a spring biasing so as to contact the pin contact member always to the proximal end of the contact pin.

Here, the loading (apparatus) of the sponge material between the probe holding board and the pin guide board is generally performed by assembling the two boards with a sponge material (foaming material) such as a sheet or block between the boards. It can be done by sandwiching plastic or foam rubber, etc., but after assembling it including the contact pins, load the unfoamed sponge material between both boards and foam between them. Can be done. In the former case, the contact pin can be extended by penetrating through the sponge material.

[0007]

The continuity inspection jig of the present invention basically separates the contact pin forming the probe from the socket, and the intermediate portion of the contact pin free to the socket is placed between the probe holding board and the pin guide board. It is held so that it can be moved forward and backward by utilizing the frictional engagement of the sponge material loaded in the socket. Generally, the contact pin set so that the base end abuts the pin abutting member built into the socket, At the time of contact with the continuity inspection part of the printed wiring board, while moving the surrounding sponge material to the probe holding board side (conforming deformation), it moves backward together with the pin contact member through the contraction of the spring built into the socket, When the contact with the continuity inspection unit is released, the interlocking sponge material is moved back to the pin guide board side through the extension of the spring built into the socket, and the sponge material moves forward together with the pin contact member. In the form of moving always contact between the pin contact member, that is, holding a conductive state with the socket, it performs its function.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an outline of the structure of an embodiment of a continuity inspection jig according to the present invention. Mounting holes 12 made of an insulating material (bakelite, acrylic, etc.) are installed at intervals.
A sheet-like member which is frictionally engaged with a contact pin 21 of a probe 20 extending through the space between the probe holding board 11 with a pin and the pin guide board 13 with a guide hole 14 so as to be substantially immovable. A sponge material 15 made of foamed plastic or the like having a block shape is sandwiched, and a space between them is used as a sponge layer, and a pin contact member 23 having a poppet shape at an intermediate portion is provided in the mounting hole 12 of the probe holding board 11.
A socket 22 having a built-in spring 24 for urging the pin abutting member 23 toward the front side is mounted (supporting engagement) so that the base portion connecting the lead wire 25 projects to the back side of the probe holding board 11. , And the contact pin 21 to the sponge material 1
5, the tip end portion and the base portion extend through the guide hole 14 of the pin guide board 13 and the tip portion of the socket 22, respectively, and the base end thereof abuts the pin abutting member 23.

In the continuity inspection jig of the illustrated example, the contact pin 21 generally interlocks the sponge material 15 around the contact pin 21 with the probe holding board 11 side at the time of contact with the continuity inspection portion of the printed wiring board. However, while retracting together with the pin contact member 23 through contraction of the spring 24, when the contact with the inspection unit is released, through expansion of the spring 24,
Sponge material 15 linked to the probe holding board 11 side
Conducting a continuity test of the printed wiring board in the form of moving back to the pin guide board 13 side and advancing together with the pin contact member 23 and returning to the unused state.

The present invention can be embodied in various forms other than the above, and is not limited to the configuration of the illustrated example.

[0011]

As is apparent from the above description, according to the continuity inspection jig of the present invention, the probe that is difficult to manufacture is a contact pin that does not require a bulging base portion and a socket that is independent of the contact pin. Since it is composed of the pin abutting member built in the socket and the spring, the manufacturing cost thereof can be significantly reduced as compared with the conventional one.

Further, according to the continuity inspection jig of the present invention, it is possible to easily replace only the contact pin in view of the structure of separating the contact pin and the socket.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a continuity inspection jig according to the present invention.

FIG. 2 is a cross-sectional view of an example of a conventional continuity inspection jig.

[Explanation of symbols]

 11 probe holding board 13 pin guide board 15 sponge material 20 probe 21 contact pin 22 socket 23 pin contact member 24 spring 25 lead wire

Claims (1)

[Claims] 1. A probe having a contact pin whose tip contacts a continuity inspection part of a printed wiring board and a socket having a socket for elastically retracting the contact pin and connecting a lead wire to a base end, and a probe. A jig for inspecting a printed wiring board, comprising: a probe holding board that holds the socket through supporting engagement of a socket; and a pin guide board that guides the tip end of a contact pin of the probe. A guide board is installed at a distance, and an intermediate portion of the contact pin is extended between the probe holding board and the pin guide board and frictionally engages with the intermediate portion of the contact pin substantially immovably. A spring for loading a sponge material and for urging the pin abutting member with which the base end of the contact pin comes into contact with the socket and the pin abutting member to always come into contact with the base end of the contact pin. Continuity inspection jig built in.