JPH09283882A - Connection structure of flexible printed wiring substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove limitation of connection positions between substrates by a method wherein flexible printed wiring substrates can be connected under a positioning state without forming particularly a reception part for positioning in a camera body. SOLUTION: A hard printed wiring substrate 1 used together with flexible printed wiring substrates 2, 3 in a camera etc., is used as a support member receiving a connection part between the flexible printed wiring substrates 2, 3, and lands 4, 5, 6 for positioning the flexible printed wiring substrates 2, 3 in a hard printed wiring substrate 1 by solder are formed in the hard printed wiring substrate 1 and the flexible printed wiring substrates 2, 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure between flexible printed wiring boards.

[0002]

2. Description of the Related Art Conventionally, in a camera, for example, a flexible printed wiring board has been used as internal wiring. Connection between printed wiring boards is generally performed by providing a dedicated receiving portion on the body as shown in FIG. 6 and via this receiving portion. In the figure, 51 and 52 are flexible printed wiring boards, and 53 is a receiving portion formed on the body. The receiving portion 53 is formed with bosses 54, 55 for positioning the flexible printed wiring boards 51, 52 with each other.
Positioning holes 56 and 57, which are fitted to the bosses 52 and 55, are formed in the plate 2, respectively. Then, by positioning the two wiring boards 51, 52 with respect to the bosses 54, 55 and soldering the wiring patterns 51a, 52a of the wiring boards 51, 52 one by one in a state where the end portions are overlapped, Both wiring boards 51 and 52 are electrically connected.

[0003]

However, in this conventional method, if the position of the hole changes when the size or shape of the wiring board is changed, it is necessary to change the shape of the body in which the receiving portion 53 is formed. As a result, there is a problem that the connection portion of the wiring board cannot be freely arranged. For this reason, when changing the connection location, it is necessary to form a positioning boss on the body for each wiring board.

Therefore, the technical problem to be solved by the present invention is to make it possible to connect the flexible printed wiring boards to each other in a positioned state without specially providing the body with a receiving portion for positioning, and to provide a connection point between the boards. Is to remove the restriction of.

[0005]

Means for Solving the Problems and Actions / Effects The flexible printed wiring board connection structure according to the present invention is used together with a flexible printed wiring board in products such as cameras in order to solve the above technical problems. The hard printed wiring board to be configured as a supporting member for receiving a connection portion in which the ends of the flexible printed wiring board are overlapped with each other, and positioning means for positioning at least the lower flexible printed wiring board on the hard printed wiring board, It is characterized by being provided on a hard printed wiring board and a flexible printed wiring board.

The positioning means may be, for example, a first flexible land on the hard printed wiring board and a lower flexible printed wiring board on which the lower flexible printed wiring board is overlapped so as to be positioned side by side with the first land. A second land formed on the printed wiring board;
By soldering the lands, the wiring patterns of both flexible printed wiring boards can be connected while the lower flexible printed wiring board is positioned on the hard printed wiring board.

According to this structure, the wiring patterns of both flexible printed wiring boards can be connected on the rigid printed wiring board and with the lower flexible printed wiring board positioned on the rigid printed wiring board. Therefore, the body positioning structure that is conventionally used is not necessary. Therefore, regardless of whether or not the shape and dimensions of the flexible printed wiring board are changed, it is possible to eliminate restrictions such as modification of the shape of the body and restrictions on the arrangement of the boards. The rigid printed wiring board used as a support member for the flexible printed wiring board is used together with the flexible printed wiring board in products that have an electric circuit, so there is no need for parts dedicated to supporting the connection part. Is. Moreover, the land for soldering can be easily formed only by adjusting the etching pattern when forming the wiring pattern of the hard printed wiring board.

Further, in the above-mentioned structure, the positioning means is positioned so as to be positioned side by side with the first land formed on the rigid printed wiring board and the lower flexible printed wiring board overlaid on the rigid printed wiring board. A second land formed on the lower flexible printed wiring board, and a second land formed on the upper printed wiring board so as to be positioned side by side with the second land in a state where the upper flexible printed wiring board is superposed on the lower flexible printed wiring board. It is composed of three lands, and the wiring patterns of both flexible printed wiring boards are connected in a state where both flexible printed wiring boards are positioned on the hard printed wiring board by soldering the first, second and third lands. It can also be configured to.

Further, the positioning means has a lower flexible printed wiring board and a first through hole formed in the hard printed wiring board and a lower flexible printed wiring board in a state where the lower flexible printed wiring board is superposed on the hard printed wiring board so as to communicate with the first through hole. A second through hole formed in the printed wiring board, and a third through hole formed in the upper printed wiring board so as to communicate with the second through hole in a state where the upper flexible printed wiring board is superposed on the lower flexible printed wiring board. And connecting the wiring patterns of both flexible printed wiring boards in a state where both flexible printed wiring boards are positioned on the hard printed wiring board by inserting and fixing pins in the first, second and third through holes. It may be configured to do so.

According to this structure, since the wiring patterns of both flexible printed wiring boards can be connected in a state where both the flexible printed wiring boards are positioned with respect to the hard printed wiring board, the lower flexible printed wiring board can be connected. The workability of connection is superior to the case where only one sheet is positioned on the hard printed wiring board. In addition, by positioning both of them in this way, even if an external force is applied to either the upper or lower flexible printed wiring board after connecting the wiring patterns, the external force is applied not only to the connection portion of the wiring pattern but also to the land. Since it can be received by the positioning portion by attaching or fixing the pin, the reliability of the connection can be enhanced.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a connection structure for a flexible printed wiring board according to the present invention will be described in detail below with reference to FIGS. 1 to 3.

FIG. 1 is a plan view showing this connection structure, and FIG. 2 is a left side view of FIG. In the figure, 1 is a rigid printed wiring board, and 2 and 3 are a lower flexible printed wiring board and an upper flexible printed wiring board which are connected to each other with their ends overlapped with each other.

FIGS. 3 (a), 3 (b) and 3 (c) show the planar shapes of the hard printed wiring board 1, the lower flexible printed wiring board 2 and the upper flexible printed wiring board 3, respectively. The hard printed wiring board 1 is generally used in devices such as cameras, but in this example, a support portion 1a for receiving a connecting portion between the flexible printed wiring boards 2 and 3 is formed, In addition, the support portion 1a is provided with a circular land 4 made of copper foil for positioning the flexible printed wiring boards 2 and 3 by soldering.

The land 4 can be formed simultaneously with the wiring pattern by, for example, appropriately adjusting the etching pattern of the copper foil when forming the wiring pattern (not shown) on the hard printed wiring board 1. In addition, a protective film for protecting the wiring pattern may be formed on the surface of the printed wiring board 1. In that case, a copper foil is formed in a larger area than the circular portion of the land 4 shown in the drawing. The land 4 may be left, and the protective film may be removed only on a necessary portion on the copper foil to form the land 4.

The lower flexible printed wiring board 2 has four
It has a wiring pattern 2a of a book and a semicircular land 5 which overlaps with the right half of the land 4 of the hard printed wiring board 1 and is located side by side with the left half. The wiring pattern 2a and the land 5 can be formed simultaneously when the copper foil laminated on the base material of the flexible printed wiring board 2 is etched. Regarding the flexible printed wiring board 2 as well, when a protective film is formed on the surface, the copper foil is left in a slightly larger area than the land 5, and the protective film is removed by a necessary area to obtain the size shown in the drawing. Can be When forming the protective film, the protective film is removed from the end of the wiring pattern 2a for connection with the upper flexible printed wiring board 3.

The upper flexible printed wiring board 3 has four connection patterns 3a respectively connected to the four wiring patterns 2a of the lower flexible printed wiring board 2,
The lower flexible printed wiring board 2 has a land 6 that overlaps with the upper half of the land 5 and is located side by side with the lower half and has a shape that divides a circle into four equal parts. Similarly, the wiring pattern 3a and the land 6 can be simultaneously formed when the copper foil is etched. The same applies to the method of forming the land 6 when forming the protective film and the removal of the protective film at the end portion of the wiring pattern 3a.

In this structure, the lower flexible printed wiring board 2 and the upper flexible printed wiring board 3 are sequentially stacked on the hard printed wiring board 1 to form the lands 4, 5, 5.
6 are aligned, and the lands 4, 5, 6 are connected by soldering to position both flexible printed wiring boards 2, 3 on the hard printed wiring board 1. Then, the wiring patterns 2a and 3 of the flexible printed wiring boards 2 and 3, respectively.
Solder one a at a time and make an electrical connection. The connection part of the wiring patterns 2a and 3a by this soldering,
Reference numeral 7 is shown in FIG.

As described above, the wiring patterns 2a of the flexible printed wiring boards 2 and 3 are arranged on the rigid printed wiring board 1 while the flexible printed wiring boards 2 and 3 are positioned on the rigid printed wiring board 1. Since the 3a's can be connected to each other, the body positioning structure used conventionally is not required. In addition, a rigid printed wiring board 1 that is originally used in products such as cameras
Is used as a supporting member for the flexible printed wiring boards 2 and 3, a component dedicated to supporting the connecting portion is unnecessary. Furthermore, when an external force is applied to either the upper or lower flexible printed wiring boards 2 and 3 after the wiring patterns 2a and 3a are connected, the external force is applied not only to the connecting portions of the wiring patterns 2a and 3a but also to the lands 4, 5, and 6. Since it can be received by the positioning portion by soldering, the reliability of connection can be improved. In the above structure, if the lands 4, 5 and 6 are arranged side by side when the hard printed wiring board 1 and the flexible printed wirings 2 and 3 are stacked, the shape and size may be set appropriately. Good.

Next, the second embodiment shown in FIG. 4 will be described. In this example, only the lower flexible printed wiring board 12 is positioned on the hard printed wiring board 11. Two lands 14 are formed on the supporting portion 11a of the hard printed wiring board 11 in accordance with the width of the flexible printed wiring board 12. The method of forming the land 14 is the same as that of the first embodiment, and thus the description thereof is omitted.

The lower flexible printed wiring board 12 and the upper flexible printed wiring board 13 are respectively 4
The book has wiring patterns 12a and 13a. Further, the lower flexible printed wiring board 12 overlaps with the inner half of each land 14 of the hard printed wiring board 11,
Two lands 15 located side by side with the outer half are formed in the same manner as in the first embodiment.

As described above, the upper flexible printed wiring board 13 is positioned with only the lower flexible printed wiring board 12 positioned on the rigid printed wiring board 11 without providing the positioning land on the upper flexible printed wiring board 13. The position of the lower flexible printed wiring board 1
Both flexible printed wiring boards 12 while adjusting to 2,
Even if 13 is connected, the wiring patterns 12a, 1
There is an advantage that the workability of soldering and joining the 3a is not significantly impaired and the body positioning structure is unnecessary.

In this example, the lands 14, 15
May be provided only on one side on the left and right sides of the flexible printed wiring board 12. Moreover, in the example of FIG.
The flexible printed wiring boards 2 and 3 may be provided with 5 and 6, respectively. In any of these configurations, the wiring pattern can be connected while positioning at least the lower flexible printed wiring board without using the body positioning structure.

Next, the third embodiment shown in FIG. 5 will be described. 5 (a) is a plan view showing this connection structure, and FIG. 5 (b) is a partial cross-sectional left side view of FIG. 5 (a). In this example, the support portion 21a of the hard printed wiring board 21 is
A first through hole 24 is formed at a position corresponding to the land 14 in FIG. In addition, the flexible printed wiring board 2
2 and 23 are four wiring patterns 22a and 2 respectively.
3a and second and third through holes 25, 26 communicating with the first through hole 24 in a state where the lower flexible printed wiring board 22 and the upper flexible printed wiring board 23 are superposed on the hard printed wiring board 21. There is. Then, the pins 27 are passed through these through holes 24, 25, 26 and the end portions 27a are crimped as shown by imaginary lines, and both wiring patterns 22a, 23a are soldered in a state where both flexible printed wiring boards 22, 23 are positioned. Connect by.

Even with this structure, the flexible printed wiring boards 22 and 23 can be connected while positioning without using the body positioning structure. Further, since the flexible printed wiring boards 22 and 23 are firmly held on the hard printed wiring board 21 by the pins 27, the reliability of the connection of the wiring patterns 22a and 23a can be guaranteed.

Although the flexible printed wiring board is positioned on the hard printed wiring board in the above-described embodiments by soldering to the land or caulking the pins, other fastening means such as screws or bonding may be used. You may make it use fixing means, such as. Further, the pins for positioning may be formed in advance on the coin printed wiring board.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of a connection structure for a flexible printed wiring board according to the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 (a) is a plan view of a rigid printed wiring board,
3B is a plan view of the lower flexible printed wiring board, and FIG. 3C is a plan view of the upper flexible printed wiring board.

FIG. 4 is a plan view showing a second embodiment of a connection structure according to the present invention.

5 (a) is a plan view showing a third embodiment of the connection structure according to the present invention, and FIG. 5 (b) is a partial cross-sectional left side view of FIG. 5 (a).

6 (a) is a plan view showing a connection structure of a conventional flexible printed wiring board, and FIG. 6 (b) is FIG. 6 (a).
It is a left side view of a partial cross section of FIG.

[Explanation of symbols]

1,11,21 Hard printed wiring board 1a, 11a, 21a Support part 2, 12, 22 Lower flexible printed wiring board 2a, 12a, 22a Wiring pattern 3, 13, 23 Upper flexible printed wiring board 3a, 13a, 23a Wiring Pattern 4,14 1st land (positioning means) 5,15 2nd land (positioning means) 6 3rd land (positioning means) 7 Connection part 24 1st through hole (positioning means) 25 2nd through hole (positioning means) 26 Third Through Hole (Positioning Means) 27 Pin 27a End

Claims (4)

[Claims] 1. A flexible printed wiring board (2,3) (12,1)
3) A connection structure in which the ends of (22, 23) are overlapped and connected to each other, and the flexible printed wiring board (2, 3) (12, 13) (22, 23)
Rigid printed wiring board used with (1) (11) (21)
However, the flexible printed wiring board (2,3) (12,13) (22,
23) is configured as a supporting member for receiving a connection portion between the hard printed wiring boards (1) (11) (21) and flexible printed wiring boards (2, 3) (12, 13) (22, 23), Positioning means for positioning at least the lower flexible printed wiring board (2) (12) (22) on the hard printed wiring board (1) (11) (21)
A connection structure comprising (4,5,6) (14,15) (24,25,26,27). 2. The positioning means (14, 15) includes a first land (14) formed on the rigid printed wiring board (11) and a lower flexible printed wiring board on the rigid printed wiring board (11). The first land (14) and the second land (15) formed on the lower flexible printed wiring board (12) so as to be positioned side by side with the first land (14) in a stacked state. 2 land
It is configured to connect both flexible printed wiring boards (12, 13) with the lower flexible printed wiring board (12) positioned on the rigid printed wiring board (11) by soldering (14, 15). The connection structure according to claim 1, wherein 3. The positioning means (4,5, 6) includes a first land (4) formed on the rigid printed wiring board (1) and a lower flexible print on the rigid printed wiring board (1). A second land (5) formed on the lower flexible printed wiring board (2) so as to be positioned side by side with the first land (4) in a state where the wiring boards (2) are stacked, and the lower flexible board. The third land (3) formed on the upper printed wiring board (3) so as to be positioned side by side with the second land (5) in a state where the upper flexible printed wiring board (3) is superposed on the printed wiring board (2). 6) and the state in which both flexible printed wiring boards (2, 3) are positioned on the rigid printed wiring board (1) by soldering the first, second and third lands (4,5, 6). The connection structure according to claim 1, wherein the flexible printed wiring boards (2, 3) are connected together by means of. 4. The positioning means (24, 25, 26, 27) has a first through hole (24) formed in the rigid printed wiring board (21).
And forming a lower flexible printed wiring board (22) on the rigid printed wiring board (21) so as to communicate with the first through hole (24) on the lower flexible printed wiring board (22) The second through hole (25) and the upper flexible printed wiring board (23) overlapped with the lower flexible printed wiring board (22) so that the upper side is connected to the second through hole (25). It consists of a third through hole (26) formed in the printed wiring board (23), and the pin (27) is inserted and fixed in the first, second and third through holes (24, 25, 26). The flexible printed wiring boards (22, 23) are connected to the flexible printed wiring boards (22, 23) in a state in which the flexible printed wiring boards (22, 23) are positioned on the hard printed wiring board (21). Connection structure described.