SU877805A1 - Device for testing printed-circuit boards - Google Patents

Description

one

The invention relates to radio engineering and can be used in the output control of printed circuit boards for microcircuits with planar outputs.

A device for controlling printed circuit boards is known, which contains two contact blocks, a software block in the form of a dielectric perforated pattern, each hole of which corresponds to one point of a controlled circuit of a printed circuit board, relay switching unit, a step relay and measuring devices. During control, the printed circuit board is connected to the device using one contact block, and on the other contact block, a perforated pattern is installed, corresponding to the type of the checked board fl.

The disadvantages of this device for monitoring the pld are the need for a separate contact block for installing a template, which is structurally complex and expensive, and the reliability of the device is low due to the large number of switching elements - the relay.

The closest in technical essence to the present invention is a device for controlling printed

boards, which contains a contact block, the spring-loaded pins of which are equipped with additional contact springs, switching and switching

5 block, point switch, measuring devices, software dielectric pattern, made in the form of a printed circuit board with holes corresponding to control points. Around the holes

 template, corresponding to the starting points of the monitored circuits, made metallized pads 2.

A disadvantage of this device is the inability to control

15 printed circuit boards for microcircuits with planar outputs due to small size of contact pads and distances between them.

The purpose of the invention is to increase the reliability of contact with decreasing pitch between contacts.

This goal is achieved by the fact that in a device for monitoring printed circuit boards containing a contact block with

Claims (2)

25 by elastic contacts, a relay switching unit and a point switch connected to measuring devices, a perforated dielectric pattern in which the holes corresponding to the starting points of the pyeMJjx circuits are made with the possibility of electrical communication with the relay switching unit, the holes of the pattern correspond to the starting points controlled circuits are metallized, and the elastic contacts are made in the form of closed loops placed in the holes of the template. FIG. 1 shows a device for monitoring printed circuit boards; in fig. 2 is a dielectric pattern; FIG. 3 - the interaction of contact with the metallized hole when subjected to clamping force. The device contains a contact block 1 with elastic contacts 2 in the form of closed loops, a perforated dielectric pattern 3, made in the form of a board with holes 4, corresponding to control points, and metallized holes 5, corresponding to the starting points of the monitored circuits, re. line switching unit 6, a switch of 7 points (for example, a step relay) and measuring devices 8 and 9 The device works as follows. On the contact block 1, a template 3 is installed in series, corresponding to the type of board being tested, and the board 10 is monitored. The contacts 2 sink into the holes 4 and 5 and are connected to the contact pads of the board 10. When subjected to clamping force P monitored board 10 moves down and deforms contacts 2. At the same time, the contacts located in the holes 5 of the template connect the starting points of the monitored circuits to the relay switching unit 6. The control device performs two kinds of work: monitoring the integrity of the circuit GOVERNMENTAL control conductors and the electrical strength and insulation resistance fragmented chains. When checking the integrity of the printed conductors, all the contacts of the relay block are shorted to the case. The control is carried out by a measuring device 8, to which, using KONMyTaTopa 7, all monitored points of the circuits are connected in turn to the presence of a connection with the starting points, which are connected in the places of the metallized holes 5 of the template through the contacts 2 to the housing. When monitoring the electrical strength and insulation resistance of disconnected circuits, a switch of 7 points is set to free contact, and the relays of unit 6 are alternately connected through one circuit to the measuring device 9. At the same time, all the other circuits are connected to the housing. The use of the proposed device allows one to automate the process of output control of printed circuit boards under microscopes with planar outputs where there is no automatic design of printed wiring, and thereby improve the quality of products. Claims An apparatus for monitoring printed circuit boards comprising a contact unit with elastic contacts, a relay switching unit and a point switch connected to measuring devices, a perforated dielectric pattern in which the holes corresponding to the starting points of the monitored circuits are made with possibly electrical communication with a relay switch in order to increase the contact safety while reducing the pitch between the contacts, the holes in the template, corresponding to Primer points controlled circuits formed metallized and the elastic contacts are in the form of closed loops arranged in openings template. Sources of information taken into account in the examination 1. Medvedev A.M. Control and testing of printed circuit boards. M., 1975, p. 134-136. 2. Author's certificate of the USSR according to application No. 2461186 / 18-21, cl, H 05 K 1/04, 1977 (prototype).