JPS5852577A - Universal printed board fixture of in-circuit tester - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a universal fixture of a printed board in-circuit tester suitable for testing a wide variety of printed boards.

Logic circuit modules for electronic devices that are mounted at equipment factories are usually supplied from factories specializing in printed circuit boards as printed board packages that include predetermined electronic elements mounted on printed circuit boards, connectors, front plates, etc. In printed board factories, a predetermined automatic testing process is incorporated into the manufacturing process of the printed board packages in order to efficiently identify defects and ensure quality.

By the way, for the functional test in the final step of the testing process, it is sufficient if there is a fixture for each type of printed board with a connector that engages with the connector of the package, but for example, bypass capacitors, pull-up resistors, etc. are difficult to detect in the preliminary functional test. Quality assurance of electronic components is performed using a so-called in-circuit tester (hereinafter referred to as ICT). ICT is a device for mounting on a printed board that includes a function to eliminate leakage from other circuits by connecting a contact probe to the terminal pad on the surface of the printed board that engages the lead wire of the electronic component to be inspected. It is equipped with the following fixtures. In the case of a universal fixture, the fixture needs to have a function that is compatible with the type of printed board. Multi-contact pin-type fixtures with pins had been put into practical use.

As shown in the cross-sectional schematic diagram of FIG. 1, the former corresponds to all of the predetermined terminal pads d of the various types of printed circuit boards C to be tested with the tester, as well as the rectangular insulating substrate forming the bottom plate of the vacuum box a. The floating contact pin e is capped with pin fl + E, and the contact pin e at a specified selected position according to the type of printed board C has a ventilation hole g through which it freely passes, blinding the others. Prepare a masking jig made of an insulating material for each type of printed board, fit the masking jig into the vacuum box a, cover the box a with a printed board C, and perform vacuum chucking. , so that only the specified terminal pad d of the printed circuit board C comes into contact with the selected contact pin e'',
In this configuration, predetermined wiring is even made from the back side of the board of the fixing pin f to the ICT main body. In the latter case, as shown in Fig. 2, a multi-product printed board C to be tested by ICT is attached to a rectangular insulating substrate b' forming the raised bottom of a vacuum box a'.
A sliding pin f' capped with floating contact pins e' corresponding to all positions of predetermined terminal pads d' of is a constant vacuum box a′
The substrate b is planted by applying preload so that it sinks a predetermined amount from the bead edge of the substrate b.
It is configured to engage the push-up jig h' prepared in advance on the underside of the contact pin e) and the push-up jig h' for each product type to push up only the specified contact pin e and bring it into contact with the designated terminal pad d'. There is. The push-up jig h' has push-up pins g' set up at positions corresponding to designated terminal pads d' of the arbitrary printed circuit board C' on the insulating substrate, and It goes without saying that the lead wire groups are engaged with connectors for each type of printed board provided in the ICT main body. In any case, the conventional printed board fixture described above requires a selection jig for protruding only the designated contact pins of the printed board for each type of printed board, in addition to the common attachment. There are drawbacks such as the difficulty in assembling the tools, which hinders testing efficiency, and the need to organize and store a large number of the tools, requiring a large space.

The present invention aims to correct the above-mentioned drawbacks and provide an ICT printed board fixture with improved efficiency and workability, which makes contact only with predetermined conductor pads on the bottom surface of any printed board placed on it. The printed board mounting method of the printed board testing machine is an attachment that has contact pins to connect the printed board to the board. Predetermined wiring must be made from the ends of all fixed pins on the side to the test @ machine. The present invention is characterized by comprising a robot device that selects and embeds or removes contact pins that come into contact with conductive pads.

Preferred embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 3 is a schematic sectional view of the printed board fixture of the present invention, and Figure 4 is a schematic perspective view of the ICT system configuration to which the fixture is applied, where l is composed of a vacuum box 2, a defining pin 3, and a lead wire 4. Fixture base, 5 is a contact probe, 6 is a printed board, 7 is an electronic component, 8 is a magic hand, 9 is a robot device, 10 is a robot control device, 11 is a contact probe feeder, and 12 is an automatic ICT. be.

The present invention is an improvement of the conventional multi-contact pin type fixture with a selective masking jig shown in FIG. 1 in order to eliminate the masking jig for each type of printed board, and the fixture body 1 is as shown in FIG. Zetsugen times connected to a vacuum device (not shown) ← Shirimo 1 Yoshifugi Rikasu 9n
There is no difference from the conventional method in that the printed board 6 on which the lightning rod part 7 is mounted is positioned on the μ surface so that it can be sucked, but in the present invention, the printed board 6 is installed on the bottom of the box 2 and connected to the ICT with the lead wire 4. The fixed pins 3 are arranged at coordinate positions that include all the terminal pads 61 to be measured on each of a plurality of predetermined printed circuit boards.

And the contact probe 5 is a 1f which sucks only the printed board corresponding to the predetermined printed board to be measured.
It differs from the previous model in that J uses a magic hand to implant it into the designated fixing pin. And book fic 7. The inspection system to which Chua 1 is applied, as shown in FIG. A conventional contact probe feeder 11 equipped with a magazine mechanism that allows a new contact probe to be ejected to one tree each time the contact probe is raised. Automatic I that has a program control function that sequentially measures multiple electronic components 7 using built-in memory.
One is made in CT12. Then, while inspecting the curved surface of the Ming fixture, the contact glove corresponding to the type of printed board that had already been inspected was removed from the other fixture. (A robot with a memory function that attaches a contact probe corresponding to the type of printed board to be inspected next to the fixing pin of the fixture)
Tick up the contact probe feeder 1'1 with the magic hand 8 of the robot device @9 operated by the IJ control device 10, automatically plant it on the fixed pin at the designated coordinates, and prepare for the next work. I can do it.

As explained above, the inspection system to which the printed board fixture of the present invention is applied is superior in work efficiency because preparations for switching between printed board types are automatically made during the inspection of other types.
Moreover, since there is no need to organize and store individual jigs for each part, there is an effect of saving space in the workplace.

[Brief explanation of the drawing]

Figure 1 and! Figure 2 is a schematic diagram showing the configuration of a conventional printed board fixture, Figure 3 is a zero-shot 7, ---
---I---1 cat I Uchi et al11 dog J-%l91-
41 shows a vague perspective view of the cam configuration. In the figure, 1 is the fixture body, 2-piece vacuum box, 3 is a fixing pin, 4 is a lead wire, 5 is a contact probe, 6 is a printed board, 7 is an electronic component, 8 is a magic hand, 9 is a robot device, 10 is a robot control device, l
1 is a contact probe feeder, and 12 is an automatic ICT.

Claims (1)

[Claims] The printed board attachment of the printed board testing machine is an attachment that has contact pins that contact only predetermined conductor pads on the bottom surface of any printed board placed on it. Fixing pins corresponding to all of the conductor pads are arranged, and predetermined wiring is made from the ends of all the fixing pins on the bottom side of the board to the testing machine. and a universal printed board for an in-circuit tester, characterized in that it is equipped with a robot device that selects and plants or removes contact pins that contact the conductor pads at the tips of designated fixing pins on the upper surface side of the board. Fixture.