JPH03225283A - Short defect inspecting method - Google Patents

Abstract

PURPOSE:To easily detect short without using a large-scaled inspecting tool by electrically connecting a contact pin between the leads of electronic parts at the pitch between the contact pins which is set as the double of the pitch between the leads of the electronic parts. CONSTITUTION:The pitch A between the contact pins 12 and 12 is set as the double of the pitch B between the leads 411 and 411 of the electronic parts 41 mounted on a printed board 4. With such constitution, the pin 12 being a short defect detecting device is assigned between the leads 411 and 411 of the parts 41 mounted on the board 4. At such a time, the lead 411 is electrically connected to the lead 411 and it is possible to decide whether short defect occurs or not. Furthermore, the short is detected among all the leads by laterally deviating the pin 12 and electrically connecting between other leads 411.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for detecting short circuit defects, and particularly to a method for detecting short circuit defects that can easily detect short circuit defects without using a fixture.

[Prior Art] Conventionally, various electronic components have been mounted on valves and printed circuit boards by mounting means such as soldering to configure a wide variety of circuits.

It is necessary to inspect whether the mounted electronic components are electrically connected reliably.

A fixture, which is an inspection device, is used as a method for performing this defect inspection.

This fixture is usually mounted on a fixture pin board 311 and on a printed circuit board 4, as shown in FIG.
It has a contact pin 312 at a position suitable for the mounting position of the electronic component 41 mounted on the printed circuit board 4 at the end.
The holding part 32 is rotatably attached to one end of the main body 31 and has a plurality of printed circuit board holding pins 321 on the surface facing the main body 31.

When performing defect inspection using this fixture 3,
The printed circuit board 4 is guided and fixed by the guide pin 313 of the main body 31 of the fixture 3.

Next, the holding part 32 is closed and the printed circuit board 4 is sandwiched, and the contact pins 312 and the soldered leads 411 of the electronic component 41 are electrically connected to detect a short circuit defect.

Problems to be Solved by the Invention As mentioned above, in the conventional short circuit defect detection method, as the number of leads of the mounted electronic component increases and the lead pitch becomes narrower, the spacing between the contact pins must be similarly narrowed. It is also necessary to reduce the diameter of the contact pin.

However, there are limits to the machining accuracy of the fixture pin board and the strength of the contact pins, which has the disadvantage of placing significant restrictions on fixture production.

Therefore, an object of the present invention is to provide a detection method that can easily detect short-circuit defects without narrowing the interval between upper contact pins or without using a fixture.

[Means for Solving the Problems] Therefore, in order to achieve the above-mentioned object, the present invention provides a short circuit failure detection device having a plurality of contact pins protruding from the main body for the leads of electronic components mounted on a printed circuit board. In the method for detecting short-circuit defects by electrically connecting the contact pins, the contact pins are connected to each other at a distance between the contact pins that is twice the distance between the leads of the electronic component. It detects short-circuit defects by electrically connecting between the leads of electronic components.

Operation With the above-described configuration, the contact pins are electrically connected between the component leads to detect short-circuit defects.

Embodiment A method for detecting short-circuit defects according to the present invention will be explained with reference to the drawings.

First, the method 1 for detecting short-circuit defects of the present invention, as shown in FIG. 1, is composed of a main body 11 and a plurality of contact pins 12 protruding from the main body.

The pitch A between the contact pins 12 is set to 2@, which is the pitch B between the leads 411 of the electronic component 41 mounted on the printed circuit board 4.

Next, this short circuit defect detection method will be explained.

As shown in FIG. 2, the contact pin 12 of the short-circuit detection device 1 is placed between the lead 411 and the lead 41-0 of the electronic component 41 mounted on the printed circuit board 4. As shown in FIG.

At this time, the leads 411 and 418 are electrically connected, making it possible to determine whether or not there is a short-circuit defect.

Further, by moving this contact pin 12 laterally as shown in FIG. 3 and electrically connecting other leads 411, a short circuit between all the leads is detected.

Effects As explained above, according to the present invention, detection can be easily performed without requiring a large-scale inspection tool such as a fixture.

Furthermore, short-circuit defects between all leads can be detected by simply shifting the contact pin to one of the leads.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an inspection device used in a short-circuit detection method according to an embodiment of the present invention, FIG. 2 is a side view showing a detection example of the short-circuit detection method of the present invention, and FIG.
FIG. 3 is a side view showing a detection state in which the contact pin is laterally shifted from the detection position shown in the figure. ■...Short circuit defect detection device, 11-...Main body, 12...Contact pin.

Claims (1)

[Claims] A short-circuit defect is detected by electrically connecting a contact pin of a short-circuit defect detection device having a plurality of contact pins protruding from a main body to a lead of an electronic component mounted on a printed circuit board. In the detection method, a short circuit failure is detected by electrically connecting the contact pins between the leads of the electronic component at a spacing between the contact pins that is twice the spacing between the leads of the electronic component. A method for detecting short circuit defects.