JPS61286764A - Preparation of printed wiring board testing jig - Google Patents

Abstract

PURPOSE:To enable the making of a hold by utilizing control data used in boring a hole through a printed wiring board to be tested as it is and to reduce the warpage of said board due to temp. and humidity, by constituting a probe fixing board from two thin boards and fixing both of them by spacers. CONSTITUTION:Probe fixing boards 10-1, 10-2 are superposed by using the control data used in boring a hole through a printed wiring board to be tested and a hole is bored through both of boards. At this time, the bit 13 of a drill is preliminarily replaced with one having a diameter for inserting a probe under pressure. By this method, two probe fixing boards provided with large holes each having a diameter for inserting the probe under pressure at the perfectly same position as the printed wiring board to be tested are obtained. Next, both boards are parallelly arranged so as to provide a constant interval in matching relation to the dimension of the probe and fixed by spacers 11. Then, by using one of two thin fixing boards in order to fix the probe by a press-in ring 1-3 and using the other one in order to support the leading end of a sleeve 1-2, the same effect as a case using a thick board material can be obtained.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention is used in a so-called in-circuit tester, etc., which tests disconnections and short circuits of conductor patterns on printed wiring boards, connects mounted components, and tests electrical performance. The present invention relates to a method of manufacturing a jig for making electrical contact to various parts on a printed wiring board.

[Prior art]

Figure 2 shows a cross section of a part of a known connection jig for an in-circuit tester 5, in which a probe fixing plate 2 has a through hole 3, and a conductor probe 1 is inserted into the through hole 3. has.

In FIG. 2, a printed wiring board 7 to be tested has holes or through holes for attaching components, and components 9 are attached thereto. The glue 8 of the component 9 passes through the printed wiring board 7 and comes out on the opposite side of the component surface.

The connection jig according to the present invention has a conductor probe 1 corresponding to the component lead 8, jumper wiring section, or through-hole section.
This probe 1 is connected to the connector 4 by the conductor 5.
The printed wiring board is tested by electrically connecting the connector to the tester and connecting this connector to a tester.

The probe 1 consists of a sleeve 1-2 and a contact 1-1 inserted into the sleeve 1-2. ) is being pushed up. Furthermore, sleeve 1-
2 is provided with a press-fit ring 1-3 for press-fitting into the through hole 3 of the probe fixing plate 2.

When testing a printed wiring board, the probe fixing plate 2 of the test jig is pressed against the printed wiring board 7 to be tested.
The contactor 1-1 is brought into contact with the lead 8 portion. In the figure, 6 is a part of the casing of the test jig, which also has the function of reinforcing the probe fixing plate 2.

This type of test connection jig needs to be made in accordance with the wiring pattern of the printed wiring board to be tested, so it is important to make it inexpensively and in a short time.

Conventionally, in order to press fit and fix the probe 1, a material having a thickness of about 10 mm was used as the probe fixing plate 2.

The position of the probe on the probe fixing plate 2, that is, the arrangement of the holes, is as follows:
The position may be the same as the component insertion hole of the printed wiring board under test, but as mentioned above, since the material is thick (approximately 10 mm), the disadvantage is that a numerically controlled drilling machine for drilling holes in printed wiring boards cannot be used. This was because the drill bits used in numerically controlled drilling machines have a blade length of several millimeters or less, so they cannot be used for plates as thick as 10 mm.

For this reason, in the past, inefficient methods such as marking hole positions and drilling one hole at a time were used, which had the drawback of making it difficult to achieve accurate hole positions.

In addition, if a numerically controlled drilling machine with a long stroke was to be used, it was necessary to recreate the control data.Furthermore, while the printed wiring board 7 is made of a glass epoxy laminate, etc., the probe fixing plate 2 is Bakelite plates and the like are used, and due to differences in the materials, changes in temperature and humidity can cause misalignment between the positions of the printed wiring board to be tested and the probes of the test jig.

Furthermore, since thick material is used, the material cost is also high.

[Purpose of the invention]

The present invention uses a standard numerically controlled drilling machine for drilling holes in printed wiring boards, and directly utilizes the control data used for drilling holes in the printed wiring board under test to drill holes in the probe fixing plate 2 of the connection jig for testing. The purpose is to relatively reduce deviations due to temperature and humidity by making it possible to open the probe fixing plate 2 and to use the same material as the printed wiring board 7 to be tested as the material for the probe fixing plate 2.

[Summary of the invention]

The present invention aims to achieve the above object by constructing the probe fixing plate with two thin plates 10-1 and 10-2, and fixing both with a spacer 11, as shown in FIG. .

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 1 and 3. FIG.

The conventional probe fixing plate 2 shown in Fig. 2 has a plate thickness of 10 mm.
In contrast, in the present invention, two sheets of material each having a thickness of, for example, about 3 mm are used. In this way, even if two sheets are stacked one on top of the other as shown in FIG. 3, it becomes possible to drill holes using an ordinary numerically controlled drilling machine for printed wiring boards. That is, using the control data used for drilling holes in the printed wiring board under test, the probe fixing plate 10-1.
Layer 10-2 on top of each other and drill holes together.

At this time, the drill bit 13 is replaced with one having a diameter for press-fitting the probe. In addition, in the figure, 12 is a stop plate, which has no particular relation to the present invention.

In this way, two probe fixing plates each having a hole with a large diameter for press-fitting the probe are obtained at exactly the same position as the printed wiring board to be tested.

Next, the obtained two probe fixing plates 10-1 and 1
0-2 are placed in parallel with each other at a constant interval according to the dimensions of the probe 1, as shown in FIG.
Fixed by 1. In this case, the distance between the fixed plates on both sides is as shown in FIG.
0-1 is arranged to support the tip of the sleeve 1-2.

In this way, attach one of the two thin fixing plates to the press-fit ring 1-
3 for fixing the probe and the other for supporting the tip of the sleeve 1-2, it is possible to obtain the same effect as using the conventional thick plate material shown in FIG. 2.

The spacer 11 fixes the relative position of both rotation plates 10-1 and 10-2, and also serves to reinforce the force in the bending direction applied to the fixing plate. The bending of the probe fixing plate when the probes are pressed against each other can be reinforced using the housing 6, depending on the size of the plate and the pressure applied (number of probes). It is not necessarily necessary to have the same strength.

〔Effect of the invention〕

As explained above, by making the probe fixing plate into two thin plates, it becomes possible to process it using a standard numerically controlled drilling machine for processing printed wiring boards, and the control data is also the same as that used for printed wiring boards. Since it can be used as is, it has the effect of making test jigs in a short time. Furthermore, by using the same material as the printed wiring board, it is possible to reduce the number of materials used, and dimensional deviations due to changes in temperature and humidity can be made relatively negligible. Furthermore, by reducing the thickness of the plate, material costs can also be reduced, resulting in lower material costs, processing costs, and processing time.
It has a remarkable effect.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a test jig showing an embodiment of the present invention;
FIG. 2 shows an example of a cross-sectional view of a test jig according to the conventional method, and FIG. 3 shows an example of a case where a hole is drilled in a probe fixing plate using the method of the present invention. Explanation of symbols 1...Probe 1-1...Contactor 1-2...Sleeve 1-3...Press-fit ring 2...Conventional probe fixing plate 3...Probe press-fitting through hole 4...Connector 5...Conductor 6...Housing 7...Printed wiring board under test 8... Component lead 9... Component 10-1... Probe fixing plate 10 according to the present invention
-2... Probe fixing plate 11 according to the present invention...
... Spacer 12 ... Stop plate 13 ... Drill bit No. 11! I J2rA Pigeon 3 (21

Claims (1)

[Claims] Using the control data of the numerically controlled drilling machine used to drill holes for wiring in the printed wiring board under test, two probe fixing plates having probe insertion holes at the same positions as the wiring boards were made, and the two fixing plates were A method for manufacturing a printed wiring board test jig, characterized in that the probes are fixed to each other with a spacer at a fixed distance determined by the dimensions of the probe.