JPH06302930A - Connection structure for flexible printed board - Google Patents

Abstract

PURPOSE:To provide connection structure of flexible printed boards which can obtain excellent electric connection, when the arrangement of a plurality of pairs of contact terminals to be in contact with each other are not all identical, with respect to the pairs of all flexible printed boards, in structure wherein a plurality of pairs of flexible printed boards are electrically connected. CONSTITUTION:A first pair of flexible printed boards 2, 3 having contact terminals 2d1-2d3, 3d1-3d3 wherein mutually facing planes are brought into contact with each other and electric connection is obtained are installed. A second pair of flexible printed boards having contact terminals 4d1-4d6, 5d1-5d6 wherein mutually facing planes are brought into contact with each other and electric connection is obtained are installed. An elastic member 6 is interposed between the first and the second flexible printed board pairs when they are stacked. Holding members 1, 7 clamp the first and the second flexible printed board pairs when they are stacked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for electrically connecting a plurality of flexible printed boards, and more particularly to a structure for electrically connecting a plurality of pairs of flexible printed boards (hereinafter referred to as FPCs).

[0002]

2. Description of the Related Art Conventionally, as for a structure for electrically connecting a plurality of FPCs, as disclosed in Japanese Utility Model Laid-Open No. 61-57585, a pair of contact terminals facing a pair of FPCs are arranged. A structure in which the contact terminals of these pairs are superposed so as to match each other, and then are pressed and sandwiched from both sides by a pressing plate and a base plate via a rubber plate, and the contact terminals of the pair come into contact with each other to conduct electricity. Are known.

[0003]

However, in the conventional example, a large inconvenience occurs in large-scale joining such as electrically connecting two or more pairs of FPCs, which tend to increase recently. . That is, in the case of large-scale joining in which two or more pairs of FPCs are electrically connected, it is unlikely that the arrangement of the plurality of pairs of contact terminals to be in contact with each other is the same for all the pairs of FPCs. Become.

For example, two pairs of FPs as shown in FIG.
In the case of electrically connecting C, when the arrangement of the contact terminals of the two pairs of FPCs is different as shown in FIG. 5, there is only one pair of terminals at the positions of the contact terminals 44d5 and 45d5.
It is different from the overlapping pattern of the two pairs of contact terminals at other positions.

To explain this in a little more detail, as shown in FIG. 6, a boss 41a is integrally formed on the upper surface of the base 41, and a female screw hole 41b for FPC mounting is formed on the upper part of the central axis of the boss 41a. Has been drilled.

Contact terminals 42d2 and 43d2 are provided on the opposing surfaces of the outer portions of the first pair of FPCs 42 and 43, and contact terminals 44d2 are also provided on the opposing surfaces of the outer portions of the second pair of FPCs 44 and 45. , 45d2 are provided. The contact terminals are not disposed on the facing surfaces of the inner portions of the first pair of FPCs 42 and 43, but the second pair of FPCs 4
Contact terminals 44d5,
45d5 are provided, and the overlapping pattern of the contact terminals for a plurality of pairs is different between the outer part and the inner part. These two pairs of FPCs 42 and 43 and FPCs 44 and 45 are superposed on the upper surface of the base 41, a rubber plate 46 and a pressing plate 47 are attached to the boss 41a, and a screw 48 is screwed into the female screw hole 41b to FPCs 42 and 43. , 44, 45 are electrically connected to a plurality of pairs of FPCs.

In such a structure, the first pair of FPs
Contact terminals 42d are provided on the opposite surfaces of the outer portions of C42, 43.
2, 43d2 are provided, but since the contact terminals are not provided on the inner surfaces of the FPCs 42, 43 which are opposed to each other, the inner portions are contact terminals 42d2, 43d as compared with the outer portions.
There is a problem in that a void corresponding to the thickness of d2 is generated, and the tightening force between the contact terminals corresponding to the void is reduced. As a result, for example, the contact terminal 44d
An air gap 50 is generated between 5 and 45d5, and FPCs 44 and 45
It has a problem that the electrical connection of the device becomes impossible and the continuity becomes defective. In the structure in which two or more pairs of FPCs are electrically connected as described above, if the arrangements of the plurality of pairs of contact terminals to be in contact with each other are not the same for all the pairs of FPCs, the contact terminals are not connected. Due to the uniform overlapping pattern, the tightening force between the contact terminals is reduced, and as a result, the electrical connection between the FPCs becomes impossible,
It has a big problem of poor conduction.

Therefore, in order to solve the above-mentioned conventional drawbacks, an object of the present invention is to arrange a plurality of pairs of contact terminals to be in contact with each other in a structure for electrically connecting a plurality of pairs of FPCs of two or more pairs. Is to provide an FPC connection structure in which good electrical connection can be obtained even when all are not the same for all FPC pairs.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a first FPC pair having a contact terminal that is electrically connected by contacting surfaces facing each other and an electrical connection by contacting surfaces facing each other are provided. A second FPC pair having contact terminals to be connected, an elastic member interposed between the first and second FPC pairs when the first and second FPC pairs are superposed, and the first,
And a holding member that holds both pairs when the second FPC pair is polymerized.

[0010]

When the first and second FPC pairs are fastened, the holding force of the holding member presses the elastic member, and both FPCs are held.
The pairs are pressed, and as a result, the contact terminals of the two FPC pairs facing each other come into contact with each other to electrically connect the plurality of pairs of FPCs.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 3,
The printed circuit board base 1 which is a holding member is formed in a rectangular shape in consideration of the shape of the printed circuit board, and is generally made of a highly rigid material such as metal or plastic. On the upper surface of the printed circuit board base 1 near one side edge, a boss 1a for both stacking and holding the printed circuit boards is integrally formed. The outer peripheral surface of the boss 1a is formed as a guide surface for stacking printed boards, and a female screw hole 1b for holding the printed boards is formed in the central axis direction at the center of the upper end surface thereof. In addition, on the upper surface near the other side edge of the printed circuit board base 1, the FP
The C positioning pin 1c is integrally formed. And
On this printed circuit board base 1, lower FPC 2 and upper FP
A pair of FPCs composed of C3 and a pair of FPCs composed of lower FPC4 and upper FPC5 are arranged so as to overlap with each other.

An FPC 2 which is one of the first FPC pair placed on the printed circuit board base 1 is provided with a laminating hole 2a which is fitted to the boss 1a on the central axis of the boss 1a. And is on a concentric circle with the stacking hole 2a
The fan-shaped contact terminals 2d1, 2d2, on the surface facing the PC3,
2d3 are provided, and these contact terminals 2d1, 2d2, 2d3
Wiring patterns 2e for connecting the respective terminals to other circuit elements are connected to each. Further, a positioning hole 2c to be fitted into the positioning pin 1c is formed on the center axis of the positioning pin 1c so that positioning can be performed when the printed circuit boards are stacked.

Then, the upper F that forms a pair with this FPC2
The PC 3 is provided with a laminating hole 3a fitted on the boss 1a on the central axis of the boss 1a. The laminating hole 3a is formed.
The fan-shaped contact terminals 3d1, 3d2, 3d3 are arranged on the surface concentric with and facing the lower FPC2 at positions facing the fan-shaped contact terminals 2d1, 2d2, 2d3, respectively. Wiring patterns 3e for connecting the terminals to other circuit elements are connected to 3d2 and 3d3, respectively. And the positioning pin 1c
A positioning hole 3c to be fitted into the positioning pin 1c is formed on the central axis of the so as to be positioned when the printed circuit boards are stacked.

The second FPC pair laminated on the first FPC pair thus constructed is formed as follows. The FPC 4, which is one of the second FPCs, has a laminating hole 4 fitted on the boss 1a on the central axis of the boss 1a.
a is provided, and a fan-shaped contact terminal 4d1 is provided on the surface concentric with the laminating hole 4a and facing the upper FPC 5.
4d2, 4d3, 4d4, 4d5 and 4d6 are arranged, and the contact terminals 4d1 to 4d6 are respectively connected with a wiring pattern 4e for connecting the respective terminals to other circuit elements. Further, a positioning hole 4c fitted into the positioning pin 1c is formed on the central axis of the positioning pin 1c so that positioning can be performed when the printed circuit boards are stacked.

Then, an FPC 5 paired with the FPC 4
Is formed with a laminating hole 5a fitted to the boss 1a on the central axis of the boss 1a, and a fan-shaped contact is made on the surface concentric with the laminating hole 5a and facing the lower FPC 4. Terminals 5d1, 5d2, 5d3, 5d4, 5d5, 5d6 are arranged at positions facing the fan-shaped contact terminals 4d1 to 4d6, and these contact terminals 5d1 to 5d6 are connected to other circuit elements. The wiring patterns 5e for wiring are respectively connected. And the positioning pin 1c
A positioning hole 5c that fits into the positioning pin 1c is formed on the central axis of the so as to be positioned when the printed circuit boards are stacked.

Further, the wiring patterns 2e, 3e, 4
e and 5e are coverlays 2 as shown in FIG.
It is insulation-coated with f, 3f, 4f, and 5f.

An elastic member 6 made of a rubber plate is interposed between the first FPC pair and the second FPC thus formed when the FPCs are laminated. This elastic member 6
Is formed of silicon rubber in the shape of a donut, and is disposed between both pairs by fitting the central laminating hole 6a into the boss 1a.

When holding the FPC, the FP is pressed from above.
The pressing plate, which is the holding member 7 mounted on C5, is formed in a substantially ladle shape, and the circular head of the pressing plate 7 is laminated on the central axis of the boss 1a so as to be fitted to the boss 1a. Hole 7a is formed for the positioning pin 1c.
A positioning hole 7c that fits into the positioning pin 1c is formed on the central axis of the.

The FPC 2 thus formed,
As shown in FIG. 3, FPC2 and FPC3 are first formed on the upper surface of the printed circuit board base 1 which is a holding member by stacking 3, 4 and 5 and stacking them to connect the terminals to each other. The first FPC pair is configured by stacking the positioning holes 2c and 3c by fitting the positioning holes 2c and 3c into the positioning pin 1c while fitting the 2a and 3a into the boss 1a. After a while,
The elastic member 6 is fitted to the boss 1a, and further the FPC 4 and the FP
C5 and fitting holes 4a and 5a for stacking the same to the boss 1a, and positioning holes 4c and 5c to positioning pin 1
The second FPC pair is formed by stacking by inserting into c.

The pressing plate 7 is placed on the second FPC pair.
Is arranged by fitting the stacking hole 7a into the boss 1a and the positioning hole 7c into the positioning pin 1c, thereby sandwiching the pressing plate 7 and the printed circuit board base 1 from both sides. After that, the screw 8 is screwed into the female screw hole 1b of the boss 1a, and the pressing plate 7 is press-fastened, so that the contact terminals facing each other come into contact with each other to establish an electrical connection.

FIG. 2 is a plan view of the contact terminals connected as described above as seen from above. That is,
In the first FPC pair, the contact terminals 2d1, 2d2, 2d3 and the contact terminals 3d1, 3d2, 3d3, which face each other and are to be in contact with each other, are overlapped and contact each other, and the second FPC pair is the first FPC pair. Although the contact terminals are arranged differently from the contact terminals described in 1), the contact terminals 4d1, 4d2, 4d3, 4d4, 4d5, 4d6 and the contact terminals 5d1, 5d2, 5d3, 5d4, 5d5, 5d6 which face each other should be in contact with each other. Are polymerized and come into contact with each other.

In this way, when the arrangement of the contact terminals to be in contact with each other is different between the first FPC pair and the second FPC pair, the second FPC is located at the positions of the contact terminals 4d5 and 5d5.
There is only one pair, which is different from the overlapping pattern of the two pairs of contact terminals including the first FPC pair and the second FPC pair at other positions.

However, in this way, even when the arrangement of the contact terminals of the two FPC pairs is different, the elastic member 6 interposed between the two FPC pairs presses the contact terminals of the two pairs facing each other due to its elasticity. Thus, good electrical connection between the two pairs of FPCs is made.

Next, a second embodiment of the present invention will be described below with reference to FIG. The second embodiment is constructed in substantially the same manner as the first embodiment, but the main differences from the first embodiment are the arrangement of contact terminals and the number of elastic members to be interposed. Is.

In FIG. 4, the printed circuit board base 21 as a holding member is formed in a rectangular shape in consideration of the shape of the FPC, and the upper surface of the printed circuit board base 21 has two female screw holes 21a and 21b for holding the FPC. Has been drilled.

Rectangular contact terminals 22c1, 22c2, 22c3 are arranged in rows near the tip edge of the surface of the FPC22, which is one of the first FPC pair, facing the FPC23.
These contact terminals 22c1, 22c2, 22c3 have wiring patterns 22d for connecting the respective terminals to other circuit elements.
Are connected respectively. The rectangular contact terminals 23c1, 23c2, 23c are provided near the front edge of the surface of the FPC 23 paired with the FPC 22 facing the FPC 22.
3 are arranged in rows at positions facing the contact terminals 22c1, 22c2, 22c3, respectively, and these contact terminals 23c
Wiring patterns 23d for connecting the terminals to other circuit elements are connected to 1, 23c2 and 23c3, respectively.

Further, an FPC which is one of the second FPC pair
Rectangular contact terminals 24c1, 24c2, 24c3 are arranged in rows near the tip edge of the surface of 24 facing the FPC 25, and these contact terminals 24c1, 24c2, 24c3 are provided with the respective terminals. The wiring patterns 24d for connecting to each are connected. The rectangular contact terminals 25c1, 25c2, 25c are also provided near the tip edge of the surface of the FPC 25 paired with the FPC 24 facing the FPC 24.
3 are arranged in rows at positions facing the contact terminals 24c1, 24c2, 24c3, respectively, and these contact terminals 25c
Wiring patterns 25d for connecting the terminals to other circuit elements are connected to 1, 25c2 and 25c3, respectively.

The holding holes 22a, 22b, 23a, 23 corresponding to the central axes of the female screw holes 21a, 21b are provided at both side edges of the FPCs 22 to 25, respectively.
b, 24a, 24b, 25a, 25b are provided.

Further, the elastic members 26, 27, 28 made of three rubber plates, which are interposed at the time of stacking the FPCs, are also formed in a rectangular shape having the same shape as the printed circuit board base 21 and made of silicon. The elastic members 26, 27, 28 have holes 26a, 26b, 27a, 27b for holding on the central axis of the female screw holes 21a, 21b of the printed circuit board base 21, and 2a, 2b.
8a and 28b are provided so that they can be inserted and positioned when the printed circuit boards are stacked.

Further, the pressing plate 29, which is a holding member to be mounted when holding the FPC, is formed in a rectangular shape having the same shape as the printed circuit board base 21, and the female of the printed circuit board base 21 is formed on the pressing plate 29. Through holes 29a and 29b for holding are formed on the central axes of the screw holes 21a and 21b, and
Positioning and holding after stacking are possible.

In the second embodiment having the above-mentioned structure, the printed circuit board base 2 which is the holding member is first used.
The first elastic member 26 is laminated on the upper surface of
2 and the first FPC pair consisting of the FPC 23 are laminated while positioning, and then the second elastic member 27 is interposed,
Further, a second FPC including an FPC 24 and an FPC 25.
The pairs are sequentially stacked while positioning. Then, the third elastic member 28 is laminated, and finally these are clamped from both sides by the pressing plate 29 which is a holding member and the printed circuit board base 21, and the screw 30 is screwed into the female screw holes 21a and 21b and pressed. Fasten and make electrical connections for multiple FPCs.

According to this structure, even if the contact terminal arrangements of both FPC pairs are different, the elastic member 2 interposed between both FPC pairs and between the FPC pair and the holding member.
6, 27 and 28 press both pairs of contact terminals facing each other, so that good electrical connection of the two pairs of FPCs is made.

The above description shows the case of two pairs of FPCs, but even when electrically connecting two or more pairs of FPCs, the same effect is obtained by interposing an elastic member between each two pairs. The effect is obtained.

[0034]

As described above, according to the present invention, both F
Even if the arrangement of the contact terminals of the PC pair is different, both FPs
The elastic member interposed between the C pair presses the contact terminals of both pairs facing each other, and good electrical connection of the FPCs of both pairs is made.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a flexible printed circuit board connection structure according to a first embodiment of the present invention.

FIG. 2 is a perspective plan enlarged view showing an overlapping pattern of arrangement of contact terminals in the connection structure of the first embodiment.

FIG. 3 is an enlarged sectional view of an essential part of the connection structure according to the first embodiment.

FIG. 4 is an exploded perspective view of a flexible printed circuit board connection structure according to a second embodiment of the present invention.

FIG. 5 is a perspective plan enlarged view showing an overlapping pattern of arrangement of contact terminals in a connection structure of a conventional example.

FIG. 6 is an enlarged cross-sectional view of a main part of a conventional flexible printed circuit board connection structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Printed circuit board base (holding member) 2, 3 ... 1st flexible printed circuit board pair 4, 5 ... 2nd flexible printed circuit board pair 6 ... Elastic member 7 ... Pressing plate (holding member) 8 ... Screw (holding member)

Claims (1)

[Claims] 1. A first flexible printed circuit board pair having contact terminals that are electrically connected by contacting surfaces facing each other, and a contact terminal that is electrically connected by contacting surfaces facing each other. A second flexible printed circuit board pair, and an elastic member interposed between the first and second flexible printed circuit board pairs when the first and second flexible printed circuit board pairs are superposed, and the first and second flexible printed circuit boards. A connecting structure for a flexible printed circuit board, comprising: a holding member that holds both pairs when the pairs are polymerized.