JP3655397B2 - Circuit inspection jig for printed wiring boards - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a circuit inspection jig for a printed wiring board provided with a conductive head that is in conductive contact with a concave (concave surface) circuit pattern exposed at an insulating film missing portion of a printed wiring board, and in particular, a conductive head in the circuit inspection jig. The present invention relates to improvement of the conductive contact structure.
[0002]
[Prior art]
As shown in FIG. 2, a conductive head 21 in a conventional printed wiring board circuit inspection jig is attached to a rod 24 with a universal joint (not shown) of an air cylinder 23 attached to an intermediate frame 15 of an upper jig, for example. The head base 22 is formed of a flat, thin plate-like conductive rubber or metal foil attached to the front end surface of the head base 22. (Plate Jig Head) 16 and 20, the rod 24 of the air cylinder 23 is extended through the head plate 16 to be brought into pressure contact with the concave circuit pattern 27 of the printed wiring board 26. On the other hand, when the rod 24 contracts, the pressure contact of the conductive head 21 with respect to the circuit pattern 27 is released.
[0003]
[Problems to be solved by the invention]
However, a conventional circuit in which such a flat conductive head 21 is attached to the tip of the rod 24 of the air cylinder 23 and contacts and separates from the concave circuit pattern 27 of the printed wiring board 26 through the expansion and contraction of the rod 24. A large air cylinder cannot be used for the inspection jig because of the space limitation of the air cylinder 23 between the intermediate frame 15 and the head plate 16, and therefore the pressure applied by the conductive head 21 is insufficient. For this reason, there is a problem that the contact with the circuit pattern 27 becomes incomplete particularly when the circuit pattern 27 having a concave shape due to the high density of the circuit , and hence the lacking portion of the insulating film is small . The air cylinder 23 and the circuit pattern 27 of the conductive head 21 and the printed wiring board 26 by the swing of the rod 24 of the air cylinder 23 with a large space to be occupied by an air conduit connected thereto, thus the insulating film missing portion Since there is less marginal space due to the fact that it is formed larger, contact probes, which are inspection means such as continuity of other printed wiring boards, including the head plate near the conductive head 21 are also provided. There are also problems such as being difficult.
[0004]
In view of the problems observed in the conventional circuit inspection jig with a conductive head as described above, the present invention ensures that the conductive head contacts the concave circuit pattern of the printed wiring board without using an air cylinder and with a small pressure. It is an object of the present invention to provide a printed circuit board inspection jig having a compact structure that can be provided with contact probes including the vicinity of the conductive head.
[0005]
In the circuit inspection jig according to the present invention, the conductive head is attached to the head board for sandwiching the printed wiring board of the upper jig or the lower jig, and the conductive head can be contacted with the circuit pattern of the printed wiring board through the insulating film. It has the structure which provided the convex-shaped electroconductive contact part which protrudes in the .
[0006]
In general, the conductive head can be formed of conductive rubber from the viewpoint of high form (shape) adaptability due to elastic deformation.
[0007]
In the circuit inspection jig according to the present invention, if the printed wiring board is sandwiched between the head plate of the upper jig and the lower jig , the convex conductive contact portion of the conductive head protruding outward is the printed wiring board. while the insulation film missing portion conductively contacts the concave circuit pattern through, if release the holding by the head plates, conductive contact is released to the circuit pattern by retraction of the conductive head.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the circuit inspection jig according to the present invention will be described with reference to FIG.
[0009]
The circuit inspection jig shown in FIG. 1 has a conductive plate facing the concave circuit pattern 27 of the printed wiring board 26 in the protective plate notch portion 19 of the base 17 with the protective plate 18 constituting the head plate 16 of the upper jig. The conductive contact portion 12 is a protective plate on the head base 13 to which the conductive head 11 made of a concavo-convex-shaped conductive rubber having the contact portion 12 protruded larger than the thickness of the insulating coating 28 (the depth of the recess of the circuit pattern 27). The structure is such that it is attached to the lower surface of the base 17 by adhesion to the lower surface of the base 17 so as to protrude beyond the thickness of the insulating coating 28 outside the cutout portion 19, that is, below the head plate 16.
[0010]
In this circuit inspection jig, the printed wiring board 26 is held between the upper jig and the lower jig head plates 16 and 20 to hold the conductive head 11 protruding below the upper jig head board 16. The conductive contact portion 12 can be brought into contact with the circuit pattern 27 by entering the concave portion of the circuit pattern 27 of the printed wiring board 26.
[0011]
In addition to this, the conductive head is formed of a metal foil formed into an uneven shape, or the conductive head is attached to the head plate portion of the lower jig instead of the head plate portion of the upper jig, etc. The present invention can be implemented in various modes, and is not limited to the illustrated modes.
[0012]
【The invention's effect】
As is apparent from the above description, according to the circuit inspection jig (conductive contact structure of the conductive head) according to the present invention, the conductive head is attached to the head plate for holding the printed wiring board and insulated from the conductive head. Since the convex conductive contact portion that can contact the circuit pattern through the missing film portion is provided , the circuit pattern can be reliably brought into contact with a low pressure corresponding to the holding force of the printed wiring board by the head plate.
[0013]
Further, according to this circuit inspection jig, since it has an extremely compact structure that does not require an air cylinder, an air conduit, and their operation operation means, contact probes including the vicinity of the conductive head can be additionally provided. .
[Brief description of the drawings]
FIG. 1 is a front view in which a part of an essential part of an embodiment of a circuit inspection jig for a printed wiring board according to the present invention is cut away.
FIG. 2 is a front view in which a part of a main part of a conventional circuit inspection jig is cut away.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Conductive head 12 Conductive contact part 13 Head base 16 Head board 17 Base 18 Protection board 19 Protection board notch part 20 Head board 26 Printed wiring board 27 Circuit pattern 28 Insulation film

Claims (1)

A circuit inspection jig for a printed wiring board having a conductive head that is in conductive contact with a concave circuit pattern exposed at an insulating film missing portion of the printed wiring board, wherein the conductive head is printed on an upper jig or a lower jig. A printed circuit board inspection circuit comprising a convex conductive contact portion that is attached to a wiring board clamping head plate and that is provided on the conductive head so that the circuit pattern of the printed wiring board can be contacted through an insulating film missing portion. Ingredients.

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