JPS59219982A - Jig for inspecting withstand voltage of printed board - 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 [Field of Application of the Invention] The present invention relates to a withstand voltage testing device used for testing printed circuit boards, and particularly to improvements in voltage application contact terminals.

[Background of the invention]

Conventionally, printed circuit boards used for electronic computers and the like have been made by drilling holes in copper-clad laminates, performing through-hole copper plating, baking logic circuit patterns, and etching to form the necessary conductor circuits. . However, when forming a conductor circuit, unnecessary conductor remains may occur, resulting in a short circuit or a defect immediately before a short circuit.

If such a defect is discovered after the finished product has been produced, rework or lost man-hours will be large, so it is desirable to discover it immediately after the conductor circuit formation process. For this reason, conventionally, the conductor part of the printed circuit board after the conductor circuit formation process is contacted with a continuity contact glove of a withstand voltage tester to check the withstand voltage between the conductors and each other.

However, with this method, the number of inspection points increases as the density of the conductor circuit increases, so an interface with continuity contact probes is prepared in advance at positions corresponding to the conductor sections to be tested for withstand voltage, and high voltage application is required. We use a suitable continuity tester and use its switching function to perform voltage resistance tests between test points.

However, with this method (for higher density printed circuit boards, the number of conductive contact probes to be installed per unit is approximately 1,000 to 10.000, or more depending on the product to be inspected). In addition, as the diameter becomes smaller, the mechanism becomes more detailed, requiring advanced manufacturing technology, and a socket for loading the conductive contact probe is also required.

However, the cost of manufacturing the supporting socket fixing board, assembling it, and man-hours for wiring between the socket and the continuity test tank for energization are expensive, and this is a major bottleneck in carrying out voltage resistance tests. .

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive contact terminal that can replace a continuity contact probe for testing voltage resistance.

[Summary of the Invention] A feature of the present invention is that a voltage resistance test can be carried out without deteriorating the voltage resistance performance between conductor patterns on a printed board.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described with reference to FIG. Figure 1 is a top view showing the printed board pressure test jig, and Figure 2
The figure shows a sectional view taken along line A-i in FIG.

In order to perform a pressure resistance test on the printed board 5 to be inspected, the voltage applied printed board 8 is placed on the inspection table 4 so as to face the location bin 6 as a reference. .

The voltage application printed board 8 is positioned in advance so that the Sulpol land contact terminal 7 contacts the conductor portion 1.2 of the printed board 5 to be inspected, and the voltage application printed board 8 is placed in contact with the voltage application positive conductor portion 1 of the printed board 5 to be inspected. The positive probe is connected to the end of the back conductor section 9 of the voltage application printed board 8 so that the positive side of the voltage output of the pressure-resistant needle 12 can be energized, and all the lands on the surface can be energized via the through holes. Create a circuit in advance. - Connect a negative globe to the surface conductor section 9 of the voltage and pressure application printed board 80 so that the negative side of the voltage output of the pressure-resistant needle 12 is energized to the negative electrode conductor section 2 for applying lightning pressure. In addition, the through-hole land contact terminal 7 is subjected to surface treatment, for example, gold plating in this example, in order to improve the contact condition.Furthermore, to further ensure the contact condition, a voltage applied printed board is applied. The vacuum pump 1 is connected via a suction vibrator 10 so that vacuum suction can be performed from below the through hole of the through hole contact terminal 7 of 8.
1 is installed so that the conductor part of the printed board 5 to be inspected and the through-hole land contact terminal 7 are in close contact with each other, and a pressure plate 6 made of a Mylar sheet is provided to further enhance the vacuum effect.

To use the jig of the present invention constructed in this manner, the printed board 5 to be inspected and the pressure-resistant printed board 8 are placed facing each other with the location bin 5 positioned between them, and the vacuum pump 1
A predetermined test voltage, for example, I) C1ooV, is applied while applying pressure with a pressure plate B using a press or a press, and the leakage current is detected using a pressure-resistant needle 12.

In this example, the number of conductor layers of the voltage application printed board 8 is 2.
However, depending on the density of the conductor circuit of the printed board to be inspected, the voltage application circuit may be formed using three or more layers.

In addition, although the number of conductor layers in the printed board to be inspected is one, for products with two or more layers, the conductor part to which the positive electrode is applied and the negative electrode part should be checked in advance so that, for example, between adjacent conductors can be inspected in advance. The conductor section to which voltage is applied is divided into two parts, and a corresponding voltage application printed board is manufactured.

In addition, if a flexible printed board is used for one of the voltage-applying printed boards of the inspection jig (2), even better contact between the two can be obtained.

〔Effect of the invention〕

According to the present invention, the following effects can be obtained.

In other words, it is possible to perform voltage resistance testing using an inexpensive pressure-resistant printed circuit board without using a continuity testing machine including an expensive continuity contact glove, and the manufacturing cost of voltage-resistant testing jigs is less than 10% of the conventional cost. This resulted in a huge savings in pressure test costs.

[Brief explanation of drawings]

FIG. 1 is a top view of a pressure test jig according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line A--A. DESCRIPTION OF SYMBOLS 1... Electricity, pressure application positive electrode conductor part, 2... Voltage application negative electrode conductor part, 5... Location bin, 4... Inspection table,
5. Printed board to be inspected, 6... Pressure plate, 7... Through hole land contact terminal, 8... Voltage application printed board,
9... Voltage application printed board conductor section, 10... Suction pipe, 11... Vacuum pump, 12... Pressure resistant needle. Figure 1 4

Claims (1)

[Claims] 1. In an inspection jig consisting of a through-hole land of a voltage-applying printed board at a voltage-applying contact terminal used for voltage proof testing of a printed board having conductor circuits and conductor null holes on the front and back sides and inner layers of an insulating board, Compatible with multiple conductor circuits and conductor through holes,
A land with a through hole is provided as a contact terminal, and the contact surface of the contact terminal is subjected to surface treatment to prevent poor contact, and
A pressure-resistant inspection jig for a printed board, characterized in that the printed board to be inspected is vacuum-suctioned through the through-hole to achieve a good contact state.