JP2897847B2 - How to connect printed circuit boards - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting printed circuit boards, and more particularly to a method for connecting printed circuit boards using a surface contact type connector.

[0002]

2. Description of the Related Art Conventionally, a printed circuit board 1 on which a semiconductor element 8 or the like is mounted is connected to another printed circuit board 3 by using a surface contact type connector 2, or
In order to set the printed circuit board 1 in a tester for performing a short-circuit test, as shown in FIG. 3, a connector 2 having contacts 6 urged vertically is disposed between the printed circuit boards 1 and 3. Then, the contact 6 is pressed against the printed board 1 and the connection pad 7 formed on the connection target 3 thereof.

[0003]

However, in the above-mentioned conventional example, as shown in FIG.
If the board 1 is warped, or if the set position of the printed circuit board 1 is shifted as shown in FIG. 4B, a contact failure or short circuit between the contact 6 of the connector 2 and the connection pad 7 is caused. In some cases, and lacks reliability.

An object of the present invention is to solve the above-mentioned drawbacks, and an object of the present invention is to provide a method of connecting printed circuit boards which can improve connection reliability.

[0005]

According to the present invention, there is provided the above object.
Is the connection pad provided on the printed circuit board and the connection target
The connection pads provided on the
In the method of connecting a printed circuit board to be connected via a connector, the printed circuit board and a connection target are connected to each other by a connection pad.
A dummy pad having a small area is formed, and the connector is provided on the printed board while providing at least one pair of the printed board and dummy contacts corresponding to dummy pads provided on a connection target of the printed board. This is achieved by providing a method of connecting a printed circuit board in which the dummy pads are short-circuited and the connection between the printed circuit board and the connection object is checked when the printed circuit board is connected to the connection object.

The dummy pad 4 can be formed smaller than the connection pad 7 for the contact 6 of the connector 2.

[0007]

[Operation] Based on the above configuration, the printed circuit board 1 and the connection target 3
The surface contact type connector 2 has a pair of dummy contacts 5 in addition to the contacts 6 corresponding to the signal or power supply connection pads 7, and the printed circuit board 1 and the connection target 3 It is pressed against the provided dummy pad 4. The dummy pads 4 of the printed circuit board 1 are short-circuited to each other, and the contacts 6 of the connector 2 and the connection pads
The poor contact with 7 is detected only by checking the continuity between the dummy pads 4 on the connection target 3 side of the printed circuit board 1.

When the dummy pad 4 is formed smaller than the connection pad 7, the detection accuracy can be improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a printed board on which a semiconductor element 8 is mounted on a mounting surface, and a plurality of connection pads 7 are arranged on a back surface. The printed circuit board 1 has at least one pair of dummy pads 4 slightly smaller than the connection pads 7 in addition to the connection pads 7.
Are short-circuited by the internal wiring 9 of the printed circuit board 1.

Reference numeral 2 denotes a surface contact type connector for connecting the printed board 1 to a tester 3;
Each contact 6 has a plurality of contacts 6 corresponding to the connection pads 7, and each contact 6 is urged vertically by an urging portion 10 arranged in the middle, and when mounted on the printed circuit board 1, The contact 6 is pressed against the connection pad 7 to establish a connection. Further, the connector 2 has a dummy contact 5 corresponding to the dummy pad 4 of the printed circuit board 1. When the contact 6 is connected to the connection pad 7, the connection between the dummy pad 4 and the dummy contact 5 is simultaneously established. Is to be made.

On the other hand, the tester 3 to which the printed circuit board 1 is connected includes a contact pad 6 corresponding to each contact 6 of the connector 2, a dummy contact 5 and a small area dummy pad.
4, and the dummy pad 4 is drawn out and connected to the connection confirmation terminal.

Under the above configuration, when the connector 2 is fastened together with the printed board 1 and a fastener such as a screw (not shown) by the tester 3, the printed board is
The first connection pad 7 and the connection pad 7 on the tester 3 side are connected to each other, and the dummy pads 4 are connected to each other. When the connection check terminal 11 of the tester 3 is probed in this state, it is checked whether the dummy pad 4 of the printed circuit board 1 and the dummy pad 4 of the tester 3 are properly connected via the dummy contact 5. The connection between the connection pads 7 can be confirmed at the same time by confirming the conduction.

In the above description, the case where the tester 3 of the printed circuit board 1 is to be connected has been described. However, the present invention is not limited to this, and it is needless to say that the present invention can be applied to the case where boards are connected to each other. is there.

[0014]

As is clear from the above description, according to the method of connecting a printed circuit board according to the present invention, the connection state with the connection target can be easily inspected, so that the connection reliability can be improved. it can.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

2A and 2B are diagrams showing a difference in size between a connection pad and a dummy pad, wherein FIG. 2A shows a connection pad and FIG. 2B shows a dummy pad.

FIG. 3 is a diagram showing a conventional example.

4A and 4B are diagrams showing a problem of the conventional example, in which FIG. 4A shows a connection failure due to warpage of the substrate, and FIG. 4B shows a connection failure due to displacement of the substrate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed circuit board 2 Connector 3 Connection object 4 Dummy pad 5 Dummy contact 6 Contact 7 Connection pad

Continuation of the front page (72) Inventor Makoto Sumiyoshi 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (56) References Japanese Utility Model Sho-63-199474 (JP, U) Japanese Utility Model Sho-56-91484 (JP, U) (58) Field surveyed (Int.Cl. ⁶ , DB name) H05K 3/36 H05K 1/14

Claims (1)

(57) [Claims] 1. A connection pad provided on a printed circuit board
Connect the connection pad provided on the connection target with the surface contact type
In the method of connecting a printed circuit board to be connected via a contact of a printed circuit board, the printed circuit board and a connection target have a smaller surface than a connection pad.
Product dummy pad is formed, and the connector is provided with at least one pair of the dummy contact corresponding to the printed board and the dummy pad provided in the connection target of the printed board,
A method of connecting a printed circuit board, comprising: establishing a short circuit between dummy pads provided on the printed circuit board; and confirming continuity between the dummy pads provided on the connection object when connecting the printed circuit board to the connection object.