JPS6314307B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printed circuit board pattern, and more particularly to a high-density printed pattern inspection apparatus.

Conventionally, this type of inspection equipment inspects the continuity and insulation of a printed pattern by placing spring probes on the basic grid of through holes on a printed circuit board, such as 2.54 mm pitch, and establishing electrical contact between the through holes on the printed circuit board and the spring probes. However, with the recent miniaturization of electronic components, printed patterns have become denser, and the basic through-hole grid has become 1/2 or 1/4 of that of the past, making it possible to replace spring probes with through-hole basic grids. It is becoming difficult to place them.

An object of the present invention is to provide a printed circuit board inspection device that can eliminate such drawbacks.

That is, according to the present invention, there is a conductive elastic body having conductivity only in the thickness direction whose surface is electrically in contact with the circuit forming surface of the printed circuit board to be inspected, and a conductive elastic body whose surface is in contact with the back surface of the conductive elastic body to be inspected. A position converter that electrically contacts the through holes of the printed circuit board and converts the positions of all the through holes of the printed circuit board to be inspected on the basic grid on the back side, and a circuit formation of the printed circuit board to be inspected. A large number of spring probes planted corresponding to all the basic grids in an area approximately equal to the surface, a flat plate made of an insulating material that electrically insulates and fixes the spring probes from each other, and a printed circuit board to be inspected. a pressurizing mechanism for laminating the conductive elastic body and the position converting body in this order and bringing a through hole in the lower surface of the position converting body into contact with the spring probe; and a pressurizing mechanism electrically connected to one end of the spring probe to be inspected. There is obtained a printed circuit board inspection apparatus characterized in that it is comprised of an automatic circuit inspection section that determines whether the printed pattern of the circuit board is acceptable or not.

Next, details of the present invention will be explained with reference to the drawings. FIG. 1 is a perspective view showing the structure of an embodiment of the present invention, in which 1 is a printed circuit board to be inspected, 2 is a conductive elastic body, and 3 is a position converting body, each having a positioning hole 4 at a predetermined position. The stacking position is determined by the positioning pin 6 of the printed circuit board holder 5. The printed circuit board holder 5 is supported on a base 8 by a plurality of spring guides 7, and is structured to be able to slide vertically. Reference numeral 9 denotes a flat plate made of an insulating material, and a spring probe 10 is inserted and fixed onto the flat plate on a basic grid with a pitch of 2.54 mm, and one end of the spring probe 10 is connected to an automatic circuit testing section 11 for determining the quality of the printed pattern. electrically connected.

Reference numeral 12 denotes a pressure mechanism that fixes the printed circuit board 1 to be inspected, the conductive elastic body 2, and the position changing body 3 stacked as shown in FIG. Position converter 3
A through hole 13 formed on the back surface of the spring probe 10 is brought into contact with the spring probe 10. Next, the function of the position converter 3 will be explained. In FIG. 2, the through hole 14 of the printed circuit board 1 to be inspected is
It is arranged on a basic grid of 0.635 mm or 1.27 mm, and is a high-density pattern of 1/4 or 1/2 of the basic grid of 2.54 mm of the spring probe 10 on the flat plate 9. Through-holes or lands 15 are formed on the surface of the position converting body 3 that contacts the conductive elastic body 2 in correspondence with the through-hole positions of the printed circuit board 1 to be inspected,
2.54mm on the surface that contacts the spring probe 10
It has a structure in which through holes 13 are formed on the basic lattice and are connected to the lands 15 by printed patterns 16. Generally, 4,000 to 5,000 through holes are formed on a 400 mm square printed circuit board, and it goes without saying that the position converter can be easily manufactured using the inner layer pattern structure technology of the printed circuit board manufacturing method. . If such a position converter is used in combination with a conductive elastic body that is conductive only in the thickness direction, the spring probe can be electrically connected to the through hole on the 1/4 or 1/2 grid of the 2.54 mm basic grid. It becomes possible to
The quality of printed patterns on high-density printed circuit boards can be inspected using conventional spring probes.

As explained above, according to the present invention, a through hole of 1.27 mm can be formed using a conventional spring probe.
Alternatively, it is possible to inspect the printed patterns of high-density printed circuit boards arranged on a basic grid such as 0.635 mm, and to inspect printed circuit boards with different printed patterns by simply preparing a new position converter. It has various effects such as versatility.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a partially enlarged sectional view. In the figure, 1 is a printed circuit board to be inspected, 2 is a conductive elastic body,
3 is a position converter, 4 is a positioning hole, 5 is a printed circuit board holder, 6 is a positioning pin, 7 is a spring guide, 8 is a base, 9 is a flat plate, 10 is a spring probe, 11 is an automatic circuit inspection unit, and 12 is a processing unit. Pressure mechanism, 13 is a through hole on the back side of the position converter, 14
15 is a through hole of the printed circuit board to be inspected, 15 is a land on the surface of the position converter, and 16 is a printed pattern.

Claims (1)

[Claims] 1. A conductive elastic body whose surface is electrically conductive only in the thickness direction and whose surface electrically contacts the circuit formation surface of the printed circuit board to be inspected, and a through-hole of the printed circuit board whose surface is in contact with the back surface of this conductive elastic body. A position converter that electrically contacts and converts the positions of all through holes of the printed circuit board to be inspected on the basic grid on the back surface, and an area approximately equal to the circuit formation surface of the printed circuit board to be inspected. a large number of spring probes planted corresponding to all the basic grids; a flat plate made of an insulating material that electrically insulates and fixes the spring probes from each other; a printed circuit board to be inspected; the conductive elastic body; a pressurizing mechanism that brings the exchangers into close contact with each other in order and brings a through hole on the lower surface of the position converter into contact with the spring probe; and a pressurizing mechanism that is electrically connected to one end of the spring probe and determines the quality of the printed pattern of the printed circuit board to be inspected. A printed circuit board inspection device comprising an automatic circuit inspection section.