JPS6333316B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic component mounting structure in which an electronic component having a large number of terminals is reliably connected to a wiring board via a pressure contact connector using conductive rubber or the like.

2. Description of the Related Art Pressure contact connectors made of conductive rubber or the like are often used for mounting electronic components having high impedance circuits, such as liquid crystal display devices. Normally, as shown at 1 in FIG. 1, a press-contact connector has alternating conductive parts 1a made of silicone rubber containing carbon or the like and insulating parts 1b made of original silicone rubber. Conventionally, as shown in FIG. 2, such a press-contact connector 1 is connected to a glass substrate 2 on which display electrode terminal patterns of a liquid crystal display element are arranged in parallel around the periphery, and a connection terminal of a printed circuit board 3 on which a drive circuit such as a MOSIC is mounted. The glass substrate 2 and the printed circuit board 3 are interposed between the patterns 3a, and the glass substrate 2 and the printed circuit board 3 are pressurized by a pressurizing means such as a screw shown as 4 in the figure, thereby connecting the connection terminals of both substrates. However, FIG. 2a is a plan view, and FIG. 2b is a sectional view taken along a line connecting the pressurizing means 4, indicated as 5 in the plan view. The contact resistance of pressure welding connectors varies depending on the degree of compression, and in general, a compression amount of 10 to 20% in the compression direction is considered optimal. The pressure welding connector 1 has its conductive portion 1a,
Conventionally, it has been arranged parallel to the line 5 connecting the pressure means for convenience of alignment with the connection terminal pattern on the board. However, in the conventional structure described above, if the number of connection terminals is large and the pressure contact connector 1 is long, the deflection of the glass substrate 2 and the printed circuit board 3 cannot be ignored. In other words, the connector 1 is strongly compressed near the end of the connector 1 near the pressurizing means 4,
Although the connection between the terminals on both boards is good, near the center of the pressurizing means 4, both boards 2 and 3 are bent, as can be clearly seen from FIG. The connection state between the terminals on the surface 3 often becomes defective, and it is necessary to take special measures to prevent the occurrence of such defects.

An object of the present invention is to provide a mounting structure for electronic components in which all terminals of both boards are reliably connected by a pressure welding connector without the need for special measures as in the past. be.

In order to achieve the above object, in the present invention,
We focused on the fact that the conventional failure phenomenon occurs because the pressing force at each part of the pressure welding connector is uneven because each part is located at a greatly different distance from the pressurizing means, and the amount of deflection of the board at each part also differs greatly. However, it was decided that the press-contact connector would intersect the line connecting the pressurizing means at approximately the midpoint of this line and be disposed non-parallel to this line. In other words, the difference in pressing force due to the difference in distance from the pressurizing means to each part of the pressure welding connector is significantly reduced, and the pressure force applied to each part of the pressure welding connector is made relatively uniform.

Figure 8 shows one embodiment of the present invention, a is a plan view, b
is a front view. Since the glass substrate 2 is transparent, the arrangement of the pressure contact connector 1 can be clearly seen in the plan view a. At approximately the midpoint of the line 5 connecting the pressurizing means 4,
The pressure contact connector 1 intersects the line 5 at an intersection angle θ. For this reason, the end of the pressure welding connector 1 is also separated from the line 5 by a predetermined distance or more, so the amount of deflection of both boards 2 and 3 at this portion is greater than the predetermined amount, and the amount of compression at each part of the pressure welding connector 1 is greater than that of the conventional one. much more uniform. This intersection angle θ is set to an optimum value based on the materials and dimensions of both boards, the pattern pitch of the connection terminals, the pitch of the conductive portion of the pressure contact connector, the mounting space, etc. There has been sufficient margin in the pattern of the connecting terminals on both boards, the pattern pitch, the dimensions of the conductive part of the pressure welding connector, and the pitch, etc., so there is no need to change the conventional structure at all, and only a small amount can be made. The present invention can be carried out by simply manufacturing and using a jig for arranging the pressure-welding connectors at an appropriate intersection angle θ.

As explained above, according to the present invention, there is an effect that the connection between both board connection terminals can be made highly reliable by using a pressure contact connector, with almost no increase in cost.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a pressure welding connector, Fig. 2a is a plan view of a conventional electronic component mounting structure using a pressure welding connector, b is a sectional view thereof, Fig. 3a is a plan view of an embodiment of the present invention, and b is a FIG. 1... Pressure welding connector, 2... Glass substrate, 3...
...Printed circuit board, 4...pressure means, 5...line connecting the pressure means.

Claims (1)

[Claims] 1. An electronic component surface on which a large number of connection terminal patterns are linearly arranged side by side, and a wiring board surface on which connection terminal patterns are provided corresponding to the terminal patterns, and insulating portions and conductive portions are alternately formed. In a mounting structure for electronic components that are connected by applying pressure via a pressure welding connector made of a rod-shaped elastic body, this line is approximately at the midpoint of the line connecting two locations of the means for applying pressure between the electronic component terminal portion and the wiring board terminal portion. An electronic component mounting structure characterized in that pressure welding connectors are arranged in a non-parallel manner so as to intersect with each other.