JPH058528Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a jig for an automatic printed circuit board inspection machine.

[Technical background of the invention] Conventionally, automatic inspection machines have been widely used at printed circuit board manufacturing sites to electrically inspect the connection state of conductor patterns, which is a basic function of printed circuit boards.

In general, automatic printed circuit board inspection machines contact each land (hereinafter simply referred to as a land) of a printed circuit board's conductor pattern with a contact probe (hereinafter referred to as a pin), and check the continuity status between each pin, that is, between the lands. It is detected and compared with standard data or design data, and if there are any discrepancies, it is determined as an error, and the distinction between open wire (OP) and short wire (SH) and the related land position or pin number are displayed or printed. It has a function.

By the way, conventional printed circuit board automatic inspection machines are equipped with a box-shaped jig in which many pins are planted in a grid pattern, and the printed circuit board to be inspected is fixed so as to cover the many pins from above, and between the lands. Therefore, in one test, it is possible to test only the continuity between the lands on one side of the printed circuit board.For example, the continuity between the lands on one side and the other side It is impossible or very difficult to test the continuity between the existing lands, and if both sides need to be inspected, it is necessary to turn it over and inspect the continuity between the lands on the other side. Ta.

Further, as shown in FIG. 4, for example, the printed circuit board is provided with a plug portion 1a at its edge, and conductor portions 2 are provided on both sides of the plug portion for connecting a dedicated connector. However, when inspecting such a printed circuit board 1 using the automatic printed circuit board inspection machine, each land and the conductor portion of the plug (hereinafter referred to as the plug conductor) that are on the same surface are Although it is easy to test the conductivity between the land and the connector conductor on the other side, it is not possible to test the connection between the land on one side and the plug conductor on the back side.

As a solution to this problem, a method or means can be considered in which the pins are brought into contact with each other from both sides of the printed circuit board. However, in this case, the cost of the jig becomes extremely high, and since the number of contact points between the pin and the land inevitably increases, there is a problem that the probability of damage to the land increases.

Furthermore, there is a jig that inserts a connector into the plug part and obtains a line for inspection from the plug conductor part on both sides, but with this method, the connector has to be inserted every time the test is performed, which makes the work much easier. It becomes very complicated.

[Purpose of the invention] The present invention was developed in view of the above-mentioned circumstances, and it is easy to inspect a printed circuit board that has a plug and has conductor parts on both sides. The purpose of the present invention is to provide a jig for an automatic printed circuit board inspection machine that has a low probability of damaging the land of the circuit board and is inexpensive to manufacture.

[Summary of the invention] In other words, the jig for an automatic printed circuit board inspection machine of the present invention consists of a base to be attached to an automatic printed circuit board inspection machine, and a printed circuit board to be inspected, which has conductor parts formed on both sides of the plug part. a first group of contact probes implanted in the base so as to simultaneously contact the conductor pattern on one side and the conductor portion of the plug portion on both sides; A second contact probe group implanted in the base so as to be exposed, and a conductor portion that simultaneously contacts the second contact probe group and a conductor portion of a plug portion on the other side of the printed circuit board are formed. It is characterized by having a conductive sheet made of

[Embodiments of the invention] Hereinafter, details of embodiments of the invention will be described based on the drawings.

FIG. 1 is a side view showing the configuration of an apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view thereof.

The device of this embodiment has a base 3 to be mounted on an automatic printed circuit board inspection machine, and a base that comes into contact with each land on one side of a printed circuit board 4 to be inspected, which has plug conductor portions 4b formed on both sides. A group of contact probes 5a planted on the base 3, a contact probe 5b planted on the base 4 so as to come into contact with the plug conductor portion 4b on one side of the printed circuit board 4, and a plug portion of the printed circuit board 4. A contact probe 5c is exposed at a position slightly apart from 4a and is implanted in the base 4 so as to protrude beyond the contact probe 5b by the thickness of the board 4, and the contact probe 5c and the contact probe of the printed circuit board 4. 5
A conductor sheet 6 on which a conductor portion 6a is formed that simultaneously contacts the plug conductor portion 4b on the side not in contact with the connector a.
It is composed of. Note that the conductor sheet 6 is slidably fixed to a pedestal 3a provided on the base 3.

When inspecting the printed circuit board 4 using the apparatus of this embodiment, the printed circuit board 4 to be inspected is
is crimped from above the contact probes 5a and 5b forming the first contact probe group, the contact probe 5a is brought into contact with each land, and the contact probe 5b is attached to the lower connector conductor portion 4b.
are brought into contact with each other to close the conductive sheet 6 as shown in FIG. Then, the conductor portion 6a of the conductor sheet 6 simultaneously contacts the plug conductor portion 4b on the upper surface of the substrate 4 and the tips of the contact probes 5c forming the second contact probe group, and through the conductor portion 6a of the conductor sheet 6 and the contact probes 5c. A line for inspection can be led out from the plug conductor portion 4b on the upper surface of the printed circuit board 4. In the above, when the base 3 is mounted on the automatic printed circuit board inspection machine, the contact probes 5a, 5b,
It goes without saying that 5c is electrically connected to the input/output line of the automatic inspection machine.

As explained above, according to the device of this embodiment, even when the printed circuit board 4 having the plug conductor portions 4b formed on both sides is brought into contact with the contact probe group from only one side, the plug conductor portions 4b on the top surface are brought into contact with the contact probe group. Inspection lines can be drawn out very easily, and printed circuit boards can be automatically inspected for disconnections and short circuits between each land on one surface (bottom surface) and the plug conductor section 4b on the other surface (top surface). Can be detected by machine. Also, the plug conductor portion 4b on the top surface of the board
Since the connector and the conductor portion 6a of the conductor sheet 6 are in surface contact, there is little damage to the connector conductor portion.

Note that in the device of this embodiment, the conductor sheet 6 is attached to the base 3.
The conductor sheet 6 is fixed to the printed circuit board 4 side to be inspected using guide pins, etc., and a conductor section connected to the inspection line is provided on the base 3 side. A configuration may be adopted in which both are brought into contact.

Furthermore, in the device of this embodiment, the contact probe 5c exposed at a position slightly removed from the plug part 4a of the board 4 protrudes by the thickness of the board 4 more than the contact probe 5b that contacts the plug conductor part 4b. However, since the tip portion of the contact probe is displaceable by a spring, there is no problem in contacting the conductor sheet 6 even if the heights of the contact probes 5c and 5b are equal.

[Effects of the invention] As explained above, the jig for an automatic printed circuit board inspection machine of the present invention has conductor parts formed on both sides of the base and the plug part to be installed in the automatic printed circuit board inspection machine. a first group of contact probes implanted in the base so as to simultaneously contact the conductor pattern on one side of the printed circuit board and the conductor part of the plug part on the same side; A second contact probe group implanted in the base so as to be exposed at a slightly off position, and a conductor portion of the plug portion on the other side of the printed circuit board are simultaneously contacted with this second contact probe group. Since it has a conductor sheet on which contacting conductor parts are formed, inspection work is easy when inspecting a printed circuit board that has a plug part and conductor parts are provided on both sides, and the land of the printed circuit board is easy to inspect. The probability of damaging the product is low, and the manufacturing cost is low.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the configuration of an apparatus according to an embodiment of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a side view showing the state when a printed circuit board is inspected by the apparatus according to the embodiment. FIG. 4 is a plan view showing the shape of a printed circuit board provided with a plug portion. 1, 4... Printed circuit board, 1a, 4a... Connection part, 2, 4b... Conductor part, 3... Base, 5a, 5
b, 5c...Contact probe, 6...Conductor sheet.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A base to be installed in an automatic printed circuit board inspection machine, a conductor pattern on one side of a printed circuit board to be inspected with conductor parts formed on both sides of the plug part, and A first group of contact probes is implanted in the base so as to contact the conductor portions of the plugs on the same side at the same time, and a group of contact probes are installed in the base so that they are exposed at a position slightly removed from the plugs of the printed circuit board. A conductor sheet is provided with a implanted second contact probe group and a conductor portion that simultaneously contacts the second contact probe group and a conductor portion of a plug portion on the other side of the printed circuit board. A jig for an automatic printed circuit board inspection machine, characterized in that the tip position of each contact probe of the first contact probe group and the second contact probe group is configured to be displaceable by a spring. (2) The jig for an automatic printed circuit board inspection machine according to claim 1, wherein the conductive sheet is slidably fixed to the base. (3) The jig for an automatic printed circuit board inspection machine according to claim 1, wherein the conductive sheet is slidably fixed to the printed circuit board to be inspected.