JPH0555720A - Connecting structure for printed wiring board - Google Patents

Abstract

PURPOSE:To obtain a structure for connecting a plurality of flexible printed boards in a press-contacted state with a common press contacting member. CONSTITUTION:After cylindrical rubber pieces 17a and 17b are arranged in grooves 16a and 16b provided at the connecting part of a camera body, connection patterns of substrates 11 and 12 and substrates 13 and 14 are formed in a faced state on the pieces 17a and 17b and the substrates are pressed with a pressure plate 19. The press-contacting force between the connection patterns are corrected by changing the diameters of the rubber pieces 17a and 17b so that the pressure contact force can become uniform even when a level difference exists between the substrates 11 and 12 and substrates 13 and 14 due to the short dimensions of the substrates 13 and 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure for connecting a plurality of printed circuit boards by pressing them against each other.

[0002]

2. Description of the Related Art With the improvement of camera performance and multi-functionality,
The number of circuit components incorporated in the control circuit of the camera and the number of switches are significantly increased from the initial control circuit. Therefore, not only is the area of the printed circuit board increased, but the printed circuit board is appropriately divided and distributed in a narrow space inside the camera. In this case, a structure for connecting a plurality of divided printed circuit boards to each other is required, but recently, a connection structure by pressure contact has been proposed which enables easy and reliable connection.

FIG. 7 and FIG. 8 show an example of a conventional connecting structure by pressure contact of a printed circuit board. FIG. 7 is a perspective view for explaining the connecting structure and FIG. 8 is a sectional view of the connecting structure portion.
In FIGS. 7 and 8, 1 and 2 are flexible printed circuit boards, in which connection patterns 1a and 2a are formed on the respective boards, positioning holes 1b and 2b, screw holes 1c and 2
c are provided respectively. Reference numeral 3 denotes a camera body, which has a groove 4 for receiving a cylindrical rubber piece 5 at a connecting portion, a positioning pin 6 and a screw hole 7.
The groove 4 is a groove shallower than the diameter of the cylindrical rubber piece 5. A pressing plate 8c has positioning holes 1b and 2b and screw holes 1c and 2c, like the printed boards 1 and 2.

A connection pattern 1a for the printed circuit boards 1 and 2,
To press-connect 2a, firstly insert the groove 4 of the camera body 3
The rubber piece 5 is placed on the. The connection patterns 1a and 2a are arranged so as to face each other, and the positioning holes 1b and 2b of the printed circuit boards 1 and 2 are inserted into the positioning pins 6. When the pressing plate 8 is arranged on the printed board 2, the pressing plate 8 positioning hole 8b is inserted into the positioning pin 6, the screw 9 is inserted into the hole 8c, and the screw hole 7 of the camera body is tightened.
Due to the elasticity of, the connection patterns 1a and 2a of the printed circuit boards are pressed against each other and connected.

[0005]

However, the above-mentioned connection structure by pressure contact of the printed circuit board is for connecting one board to another board. When connecting multiple printed circuit boards, reduce the number of connection sites provided on the camera body by arranging multiple printed circuit boards in multiple layers and connecting the boards at one connection site provided on the camera body. In addition, it is possible to reduce the area on the board used for connecting the boards to each other. However, the connecting patterns of a plurality of printed circuit boards to be connected are not always the same size, and it is not used to design all the connecting patterns to have the same size. There is a problem that the space in the narrow camera body cannot be effectively used because the useless connection pattern is generated and the area of the printed circuit board is unnecessarily increased. The present invention is intended to solve the above problems.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and is provided with a pressing member at the connecting pattern portions of a plurality of printed circuit boards arranged to face each other so as to connect the connecting patterns. In a connection structure of a printed circuit board, which is disposed at a connection site and is pressed to connect the connection patterns to each other via a pressure member at the connection site, a plurality of sets of connection patterns of the printed circuit boards required for the connection site are provided. The parts are arranged in multiple layers, and the connection patterns are connected by pressing through a pressing member that equalizes the pressure contact force between the connection patterns arranged in the multiple layers over the entire connection site. ..

[0007]

By arranging a plurality of connection patterns for a plurality of printed circuit boards at one connection site, a plurality of printed circuit boards can be connected at one connection site. The pressure member has a structure in consideration of the thickness of the connection pattern portion of the printed circuit boards arranged in multiple layers, and makes the pressure contact forces between the connection patterns uniform over the entire connection portion.

[0008]

Embodiments of the present invention will be described below.
Here, the dimensions of the connection patterns on the flexible printed circuit boards (hereinafter simply referred to as "boards") arranged in multiple layers at the connection site are different, and therefore the connection of the multilayer substrates arranged at the connection site is not uniform in thickness. The structure will be described.

FIG. 1 and FIG. 2 show a first embodiment of a connection structure by pressure-welding a plurality of substrates according to the present invention. FIG. 1 is a perspective view for explaining the connection structure, and FIG. 2 shows an enlarged cross section of the connection structure portion. In FIG. 2, the positioning pin and the tightening screw are omitted.

In FIG. 1, reference numerals 11 and 12 denote substrates. Connection patterns 21a and 21b are formed on the substrate 11, and positioning holes 11a, 11b and 11c and screw holes 11 are provided.
d, 11e, 11f are provided, the connection patterns 22a, 22b are formed on the substrate 12, and positioning holes 12a, 12b, 12c and screw holes 12d, 12e, 12 are provided.
f is provided.

Reference numerals 13 and 14 are also substrates. A connection pattern 23 is formed on the substrate 13, and positioning holes 13a,
13b and screw holes 13d and 13e are provided, a connection pattern 24 is formed on the substrate 14, and positioning holes 14a and 14b and screw holes 14d and 14e are provided. The boards 13 and 14 have one connection pattern, and the board 1
The width of the connecting portion is configured to be narrower than that of the wirings 1 and 12.

Reference numeral 15 is a camera body, which is a connection pattern for the substrate.
Groove portion 16a for receiving the cylindrical rubber piece 17a and groove 16b for receiving the cylindrical rubber piece 17b in order to press and connect the cylindrical portion.
And the positioning pins 15a, 15
b, 15c and screw holes 18a, b, c are provided.
The cylindrical rubber piece 17b has a diameter larger than that of the cylindrical rubber piece 17a. This means that when the substrates 11 and 12 and 13 and 14 are connected to the camera body 15 under pressure, the substrates 13 and 14 are connected.
This is because the side on which is arranged becomes thicker, so that this thickness is corrected to equalize the pressure contact force. Further, 19 is a pressing plate for pressing the connection pattern portion of the substrate, and 20 is a screw for tightening.

To connect the substrates 11 and 12 and 13 and 14 by pressure contact, first, the groove 16a of the camera body 15
Cylindrical rubber pieces 17a and 17b are arranged on 16b, respectively, and the connection patterns 21a and 21b of the substrate 11 and the connection patterns 22a and 22b of the substrate 12 are made to face each other, and the positioning holes 11a and 11b of the substrate 11 are arranged. , 11c and substrate 12
Positioning holes 12a, 12b, 12c of the camera body 15 are respectively positioned by positioning pins 15a, 15b, 15c of the camera body 15.
To insert.

Further, the connection pattern 23 of the substrate 13 and the connection pattern 24 of the substrate 14 are opposed to each other on this, and the substrate 1
The positioning holes 13a and 13b of No. 3 and the positioning holes 14a and 14b of the substrate 14 are inserted into the positioning pins 15a and 15b of the camera body 15, respectively.

When the pressing plate 19 is placed on the substrate 14 and tightened to the camera body with the screw 20, the rubber pieces 17a, 1
The connection pattern 21 on the substrates 11 and 12 due to the elasticity of 7b.
a and 22a and 21b and 22b, and the connection patterns 23 and 24 on the substrates 13 and 14 are pressed against each other and connected.

At this time, since the rubber piece 17b has a larger diameter than the rubber piece 17a, the substrates 11 and 12 are bent at the substantially central portion as shown in FIG. The upper surface of the substrate 12 coincides with the upper surface of the substrate 14 because the upper surface of the substrate 12 is pushed upward from a portion on which the board 17a rides. Substrate 11,
The total thickness of 12, 13, 14 and the substrate 11, 1
Rubber piece 1 so as to correct the difference with the thickness where only 2 is superimposed
By selecting the diameter of 7b, the pressure contact force between the connection patterns of the substrates 11 and 12 and the pressure contact force between the connection patterns of the substrates 13 and 14 can be made equal to each other. In addition, rubber piece 1
The diameters of the rubber pieces 7a and the rubber pieces 17b are appropriately selected according to the number of substrates arranged in multiple layers.

As described above, the rubber pieces 17a and the rubber pieces 17b have different diameters, but since the difference in the diameters is difficult to identify by eye, when the rubber pieces 17a, 17b are inserted into the grooves 16a, 16b, they are erroneously inserted. There is a possibility to put it in reverse. In order to avoid this, the lengths of the rubber pieces 17a and 17b are changed, and the grooves 16a and 16b have lengths corresponding to the rubber pieces, thereby making it possible to prevent a mistake in inserting the grooves in reverse. Further, the difference in diameter may be identified by changing the colors of the rubber pieces 17a and 17b.

FIG. 3 shows a second embodiment of a connection structure by press-contacting a plurality of substrates according to the present invention, and FIG. 3 shows an enlarged cross section of the connection structure portion. The structure of the substrate, such as the shape of the connection pattern, the positioning holes and the arrangement of the screw holes, is the same as that of the first embodiment.

In this embodiment, the substrate connecting portion of the camera body 15 is formed on a flat surface, but the pressing plate 31 arranged on the substrate 14 has a step as shown in FIG. A rubber piece 32 having a portion 32a is attached. The height of the step portion 32a is equal to that of the substrates 11, 12, 13,
The height is set to correct the difference between the total thickness of 14 and the total thickness of the substrates 11 and 12. As a result, the pressure contact force between the connection patterns of the substrates 11 and 12 and the pressure contact force between the connection patterns of the substrates 13 and 14 can be equalized.

FIG. 4 shows a third embodiment of a connection structure by pressure welding of a plurality of substrates according to the present invention, and FIG. 4 shows an enlarged cross section of the connection structure portion. The structure of the substrate, such as the shape of the connection pattern, the positioning holes and the arrangement of the screw holes, is the same as that of the first embodiment.

In this embodiment, the substrate connecting portion of the camera body 15 is provided with two grooves and cylindrical rubber pieces arranged in these grooves as in the first embodiment, but two grooves 41 are provided.
a and 41b are configured to have the same depth, and a cylindrical rubber piece 42a
The same diameter is used for 42 and 42b. On the other hand, the substrate 14
The pressing plate 43 arranged on the upper part of the upper surface has a step portion 43a as shown in FIG. The height of the stepped portion 43a is set to a height that corrects the difference between the thickness of the substrates 11, 12, 13, and 14 that are superimposed and the thickness of the substrates 11 and 12 that are superimposed.

As a result, the pressing plate 43 is pressed from above the substrate 14.
When the substrate is pressed with, the connection patterns 21a and 22a and 21b and 22b on the substrates 11 and 12, and the connection patterns 23 and 24 on the substrates 13 and 14 are pressed against each other by the elasticity of the cylindrical rubber pieces 42a and 42b. It is pressed and connected, but
At this time, the pressure contact force between the connection patterns of the substrates 11 and 12 and the pressure contact force between the connection patterns of the substrates 13 and 14 can be equalized.

FIG. 5 shows a fourth embodiment of a connection structure by pressure welding of a plurality of substrates according to the present invention, and FIG. 5 shows an enlarged cross section of the connection structure portion. This embodiment is a modification of the shape of the pressing plate 43 of the third embodiment, and the rest is the same as that of the third embodiment.

In this embodiment, the pressing plate 53 arranged on the substrate 14 is divided into a part that presses all the substrates 11, 12, 13, and 14 and a part that presses only the substrates 11, 12 so that the substrates 13, 14 are not pressed. The step 53a is formed by a dimension corresponding to the thickness, and has the same function as the pressing plate 43 of the third embodiment.

FIG. 6 shows a fifth embodiment of a connection structure by pressure welding of a plurality of substrates according to the present invention, and FIG. 6 shows an enlarged cross section of the connection structure portion. This embodiment is similar to the first embodiment, except that the substrate connecting portion of the camera body 15 is a portion for pressing all of the substrates 11, 12, 13, 14 and the substrate 1.
The step portions 63a are formed to have a size corresponding to the thickness of the substrates 13 and 14 and the portions that press only 1 and 12, and two grooves 61 of the same depth are formed on the left and right sides of the step portion 63a.
a and 61b are provided, and cylindrical rubber pieces 62a and 62b having the same diameter are arranged in these grooves.

As a result, the pressing plate 64 is pressed from above the substrate 14.
When pressed with, the connection pattern 21a on the substrates 11 and 12
And 22a and 21b and 22b, and the connection patterns 23 and 24 on the substrates 13 and 14 are cylindrical rubber pieces 62a and 62b.
Of the substrates 11 and 12 and the connection patterns of the substrates 11 and 12 and the connection patterns of the substrates 13 and 14 can be made equal to each other.

3 to 7, the positioning pin and the screw for tightening are omitted in the enlarged sectional views of the connecting structure.

[0028]

As described above, according to the present invention, the connecting pattern portions of a plurality of printed circuit boards are arranged in a multi-layered manner at the connecting portion provided on the camera body or the like, and the whole is pressure-welded. Since connection is made, a large number of printed circuit boards can be connected at one connection site, and the number of connection sites and the number of connection members provided on the camera body or the like can be reduced. Then, when the thicknesses of the overlapping printed circuit boards at the connecting portions are partially different, this is corrected by the pressing member, so that a plurality of printed circuit boards can be reliably connected with a simple structure.

[Brief description of drawings]

FIG. 1 is an explanatory perspective view of a first embodiment of a printed circuit board connection structure.

FIG. 2 is a sectional view of a connection structure portion of the first embodiment shown in FIG.

FIG. 3 is a sectional view of a connecting structure portion of a second embodiment of the connecting structure of a printed circuit board.

FIG. 4 is a sectional view of a connecting structure portion of a third embodiment of the connecting structure of a printed circuit board.

FIG. 5 is a sectional view of a connection structure portion of a fourth embodiment of the connection structure for a printed circuit board.

FIG. 6 is a sectional view of a connection structure portion of a fifth embodiment of the connection structure for a printed circuit board.

FIG. 7 is a perspective explanatory view of a conventional printed circuit board connection structure.

8 is a cross-sectional view of the connection structure portion of the conventional printed circuit board shown in FIG.

[Explanation of symbols]

1, 2, 11, 12, 13, 14: Flexible printed circuit boards 1a, 2a, 21a, 21b, 22a, 22b, 23,
24: Connection pattern 3, 15: Camera body 4, 16a, 16b, 41a, 41b, 61a, 61
b: grooves 5, 17a, 17b, 42a, 42b, 62a, 62
b: cylindrical rubber piece 32: rubber piece 8, 19, 31, 43, 53, 64: pressing plate

Claims (1)

[Claims] 1. A connection pattern portion of a plurality of printed circuit boards arranged to face each other so as to connect the connection patterns to each other, is arranged at a connection portion provided with a pressure member, and the pressure member at the connection portion is interposed therebetween. In a connection structure of a printed circuit board in which the connection patterns are pressed together to be connected, a plurality of sets of connection pattern parts of a required number of the printed circuit boards are arranged in multiple layers at the connection site, and A connection structure for a printed circuit board, characterized in that the connection patterns are connected by pressure contact through a pressure member that makes the pressure contact forces between the connection patterns uniform over the entire connection site.