JPH0143652Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a defect detection device for printed wiring boards, and more particularly to a defect detection device capable of detecting shot defects and disconnection defects in printed wiring on printed wiring boards.

Printed wiring boards, in which arbitrary printed wiring is printed on one or both sides of an insulating substrate, have very narrow intervals between the wiring or thin wiring in order to achieve miniaturization and high density. As a result, defects such as shorting between wires and disconnection of wires are becoming more likely to occur.

By the way, in the past, to detect shot defects and disconnection defects, pins were used, the tips of the pins were inserted into through holes, and a check signal was passed between the pins.

However, recently, in order to mount and connect ICs and the like, printed wiring boards that simply have electrodes printed on them without providing through holes have come to be used. In such printed wiring boards, it is very difficult to detect defects using only pins as in the past, so devices that use flat conductive rubber instead of pins are being used. I'm getting used to it. For example, as shown in Figure 1, use pin 1 for one electrode and conductive rubber 2 for the other electrode.
If a disconnection occurs, the check signal will no longer flow between the pin 1 and the conductive rubber 2, making it easy to detect. However, in the case of a shot defect, a check signal flows between pins 1, but even if there is no shot defect, the check signal flows between pins 1 through the conductive rubber 2, making it difficult to detect.

The present invention aims to improve the above-mentioned drawbacks and provide a printed wiring board defect detection device that can reliably detect shot defects and disconnection defects in printed wiring.

In order to achieve the above object, the present invention provides a printed wiring board that can send a check signal to the printed wiring of the printed wiring board, detect changes in the check signal, and detect short or disconnection defects in the printed wiring. A defect detection device has a substrate provided with conductive rubber and contact pins protruding beyond the conductive rubber, and only the contact pins are brought into contact with printed wiring provided on a printed wiring board to generate a check signal. The present invention provides a defect detection device for a printed wiring board, which can detect a shot defect by flowing the conductive rubber and detect a disconnection defect by bringing the contact pin and the conductive rubber into contact with the printed wiring board and flowing the check signal. be.

Hereinafter, embodiments of the present invention will be described based on the drawings.

In FIG. 2, 11 is a substrate. 12 is a plurality of contact pins penetrating the substrate 11;
The spring gives it elasticity. Reference numeral 13 denotes a flat conductive rubber plate fixed to one side of the substrate 11 with an adhesive or the like. Reference numeral 14 denotes a check signal device for generating a check signal and detecting a change thereof, and is connected to the contact pin 12 and the conductive rubber 13.

That is, as shown in FIG.
Press down on 5. This is because the contact pins 12 have some height, and by pushing down the printed wiring board 15, it is possible to prevent contact errors of the contact pins 12. At this stage, a check signal is passed between the contact pins 12 to detect a shot defect.

Next, the printed wiring board 15 is further pressed down using the holding plate 16, and the conductive rubber 13 is attached to the printed wiring board 15.
contact. A check signal is then passed between the contact pins 12 to detect a disconnection defect.

As described above, according to the present invention, the contact pins and the conductive rubber are attached to the board with steps,
Since short defects and disconnection defects can be detected separately, a defect detection device for printed wiring boards without detection errors can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a state in which a defect is detected by a conventional printed wiring board defect detection device, Fig. 2 is a front view of an embodiment of the present invention, and Fig. 3 is a shot diagram of the embodiment of Fig. 2. FIG. 4 shows a front view of a state in which a disconnection defect is detected by the embodiment of FIG. 2. 11... Board, 12... Contact pin, 13... Conductive rubber, 14... Check signal device.

Claims (1)

[Scope of utility model registration request] A check signal is sent to the printed wiring on the printed wiring board,
A defect detection device for a printed wiring board capable of determining whether the printed wiring is good or bad by detecting a change in the check signal, comprising a substrate provided with conductive rubber and a contact pin protruding from the conductive rubber, A shot defect can be detected by contacting only the contact pin with the printed wiring and sending a check signal, and a disconnection defect can be detected by bringing the contact pin and the conductive rubber into contact with the printed wiring and sending the check signal. Printed wiring board defect detection device.