JPH0425663Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to a test jig for testing the characteristics of an unspecified number of types of printed circuit boards using one tester.

(b) Background of the technology Recently, there has been a marked trend toward increasing the variety of printed circuit boards in smaller quantities, and installing dedicated testing equipment poses problems in terms of investment efficiency, and the operator's time loss due to setup changes is large. Therefore, there is a strong demand for the development of a long-life, high-performance printed board testing jig that can perform characteristic tests on many types of printed boards with simple switching operations.

(c) Prior Art and Problems Figure 1 is a diagram for explaining a conventional printed board testing jig.

As shown in the figure, the conventional printed board testing jig includes a printed board testing section 100, a connection switching section 120 that organizes test information input from the testing section 100 by circuit and sends it to a tester section 50, which will be described later. A tester section 50 that analyzes the test information and converts it into data.
It is made up of. The test section 100 and the connection switching section 120 are housed in independent pressure reduction tanks separated by a partition plate 121, that is, the test section pressure reduction tank 1 and the switching section pressure reduction tank 26. The printed board 2 under test is attracted and each measurement point contacts the corresponding test pin 4, and in the connection switching section 120, the individual board 27 is attracted and the conductive pins 21 planted on the board 27 correspond. It has a structure that makes contact with the input/output contact pin 22.

The test procedure using the printed board test jig will be specifically explained below.

As shown in FIG. 1, when the air in the test section decompression tank 1 is exhausted in the direction of arrow A to reduce the pressure, the printed board 2 under test is sucked in the direction of arrow B along the guide pins 6, and the printed board 2 is mounted. lead 3 of the parts
contacts the test pin 4 attached to the vacuum tank 1. Thereby, the quality information of the printed board 2 under test is inputted via the input line 12 to the input/output contact pin 22 attached to the switching section decompression tank 26. Here, when the air in the switching part decompression tank 26 is exhausted in the direction of arrow C to reduce the pressure, the individual board 27 is sucked in the direction of arrow D along the guide pin 23, and the conductive pin 21 planted on the individual board 27 is Since it contacts the input/output contact pin 22, a conductive circuit from the input side to the output side of the input/output contact pin 22 via the electric circuit conductor 28 provided on the individual board 27 is constructed. Then, quality information of the printed board 2 under test is sent from the output side of the input/output contact pin 22 via the output line 11 to the tester section 50, where the quality level is determined. Note that the test section movable plate 9 and the switching section movable plate 19 are arranged so that when the printed board 2 under test and the individual board 27 are sucked in the direction of arrow B and the direction of arrow D, respectively, the printed board 2 under test and the individual board 27 are 27 to prevent distortion from occurring,
Component leads 3 and conductive pins 2 mounted on it
1 and test pin 4 and input/output contact pin 22
The restoring spring 10 is provided to quickly return the printed board 2 and individual board 27 to the original position before the test after the test is completed. , the airtight pad 7 and the airtight sheet 8 are provided to improve the airtightness of the test section decompression tank 1 and the switching section decompression tank 26. Furthermore, the mask plate 20 of the test section 100 has test pins 4 unrelated to the test concerned.
This is to electrically isolate the test pin 4 from the tester side and to prevent the test pin 4 from contacting the printed board 2 under test and damaging it. Further, the guide plate 24 of the switching section 120 is provided for guiding the input/output contact pin 22 to accurately contact the conductive pin 21.

However, as is clear from the structure of conventional test jigs, in order to test various types of unspecified printed boards with one test jig, multiple test jigs are placed at standard positions (generally, the number is several thousand). All of the input/output contact pins 22 provided (of which the number is increasing) are added to an individual board 27 that is selectively replaced in accordance with the printed circuit board 2 under test. Therefore, the spring repulsion force of each input/output contact pin 22 is approximately 100g, but if we assume that 5000 contact pins are used, the total spring repulsion force due to these will be 500Kg. Distortion occurs in the board 27, often causing air leakage from the decompression tank and poor contact between the conductive pins 21 and the input/output contact pins 22, impeding the workability and test reliability of printed board tests.

(d) Purpose of the invention The purpose of the invention was to improve the above-mentioned conventional drawbacks, and the purpose is to provide a printed board testing jig with a structure in which only the input/output contact pins related to the test operate. It is something to do.

(e) Structure of the invention According to the invention, this purpose is to provide a group of input/output contact pins that are electrically connected to the printed circuit board test section and a group of input/output contact pins that are electrically connected to the tester section in a reduced pressure tank. An electrical circuit conductor that is provided in parallel and that is attracted by the decompression operation of the decompression tank and selectively connects pins corresponding to each of the two groups of input/output contact pins, and is implanted as an input/output terminal of the conductor. In the jig configuration, the jig has an individual board equipped with conductive pins, and the individual board transmits test information from the printed board test section to the tester section, and the planting height of the conductive pins is set to the depressurizing operation. A printed board test jig, characterized in that the conductive pin is set to be equal to the movement stroke of the individual board that is moving, and has a structure that allows the conductive pin to make limited contact only with the input/output contact pin that is related to the test. This is achieved by providing

(f) Embodiment of the invention An embodiment of the invention will be described below in detail with reference to the drawings.

2 and 3 are vertically cut views showing the structure of the main parts of the printed board test jig according to this embodiment, in which FIG. 2 shows the state before the test, and FIG. 3 shows the state during the test. are shown respectively. In these figures, the same parts as in FIG. 1 are designated by the same reference numerals.

As shown in FIGS. 2 and 3, the printed board test jig of this embodiment is selected according to the printed board 2 to be tested, and is installed on an individual board 27 attached to the connection switching section 120. The planting height of the conductive pin 21 is set to arrow D by the pressure reduction operation of the switching section pressure reduction tank 26.
The feature is that it is made equal to the movement stroke S of the individual board 27 that is attracted in the direction. That is, by doing this, the input/output contact pins 22, which are provided in a plurality of standard positions to accommodate various types of unspecified printed boards 2 under test, can contact only the conductive pins 21 necessary for the test. This means that it can be done. Note that since the individual board 27 is a dedicated board, it goes without saying that unnecessary conductive pins 21 are not installed. Incidentally, the movement stroke S of the individual board 27 accompanying the pressure reduction operation is determined by the distance H in which the input/output contact pin 22 is pushed down in the direction of arrow D by the conductive pin 21, and the position of the conductive pin 21 on the pushed down individual board 27. This is the total distance of the gap G between the surface and the contact end of the input/output contact pin 22 in its natural state. Therefore, a safety gap G is always maintained between the input/output contact pins 22 unrelated to the test and the individual board 27 pushed down by the reduced pressure. Note that the operating stroke of the input/output contact pin 22 pushed down in the direction of arrow D by the conductive pin 21 is set larger than the movement stroke S of the individual board 27 to prevent them from being damaged. Therefore, according to the printed board test jig structure of the present invention,
This avoids the phenomenon in which conventionally all the input/output contact pins 22, which are used at most 40 to 50% of each printed board 2 under test, are activated and apply more external force than necessary to the individual board.

(g) Effects of the invention As explained in detail above, the printed board testing jig of the present invention has been improved by improving the structure of the connection switching section that transmits test information of the printed board under test to the tester section. This has the great effect of making it possible to extend the service life of the device and increase the reliability of the test.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining a conventional printed board testing jig, and FIGS. 2 and 3 are longitudinal sectional views showing the main structure of a printed board testing jig according to an embodiment of the present invention. In the drawing, 1 is a test section decompression tank, 2 is a printed board to be tested, 3 is a component lead, 4 is a test pin, 6
23 is a guide pin, 7 is an airtight pad, 8 is an airtight sheet, 9 and 19 are movable plates, 10 is a restoring spring, 11 is an output line, 12 is an input line, 20 is a mask plate, 21 is a conductive pin, 22 is Input/output contact pin, 24 is a guide plate, 26 is a switching part decompression tank, 2
7 is an individual board, 28 is an electric circuit conductor, 50 is a tester section, 100 is a printed board test section, and 120 is a connection switching section.

Claims (1)

[Scope of utility model registration request] A group of input/output contact pins that are electrically connected to the printed circuit board testing section and a group of input/output contact pins that are electrically connected to the tester section are provided in parallel in the vacuum tank, and the pressure is sucked by the pressure reduction operation of the vacuum tank. The individual board is provided with an electric circuit conductor that selectively connects the corresponding pins of the two groups of input/output contact pins, and conductive pins implanted as input/output terminals of the conductor, and the individual board In the jig configuration for transmitting test information from the printed board testing section to the tester section, the planting height of the conductive pin is set to be equal to the movement stroke of the individual board moved by the decompression operation, A printed board testing jig, characterized in that the conductive pin has a structure that allows limited contact only with the input/output contact pins related to the test.