JPH11204909A - Flexible printed-wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make feasible securely pressure welding lands with each other provided on respective flexible printed-wiring boards even if the width of respective pressure welding surfaces of two pressure welding members is narrow, in such a constitution of the pressure welding lands provided in the two flexible printed-wiring boards. SOLUTION: A flexible printed-wiring board 40 is provided with pressure welding lands 52, 72 respectively pressure welded with corresponding lands 31, 32 as well as a first planar part 44 and a second planar part 46 laminately packaged with a part of the first planar part 44 on the other hand, the pressure welding land 52 is formed on the first planar 44 not laminately with the second planar part 46 while the pressure welding land 72 is formed on the second planar part 46.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a flexible printed wiring board.

[0002]

BACKGROUND OF THE INVENTION Flexible Printed Wiring Board (Flexible Printed Wiring Board)
Board) is widely used for wiring between circuit components of various electrical equipment (cameras, watches, telephones, automobile electrical equipment, computers, etc.), wiring between hard printed wiring boards, and the like.

Conventionally, two superimposed flexible printed wiring boards are sandwiched between two members (pressing members),
2. Description of the Related Art There is known a connection structure of a flexible printed wiring board, in which press-contact lands provided on each flexible printed wiring board are pressed against each other to conduct electricity.

In such a conventional connection structure of a flexible printed wiring board, when the width of the press contact land is wide (for example, when the press contact land is composed of a large number of lands), each press contact surface of the two press contact members is adjusted accordingly. Therefore, it is necessary to increase the width of the device, and thus the size of the device has to be increased.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. Even when the width of each press contact surface of two press contact members is small, the press contact lands provided on each flexible printed wiring board are provided. It is an object of the present invention to provide a flexible printed wiring board having a structure capable of reliably press-contacting each other.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a flexible printed wiring board having a press contact land which is pressed against a corresponding land formed on another flexible printed wiring board, and a first flat portion and a part of the first flat portion. The second mounted on top of
A flat contact portion, wherein the press contact land includes a first press contact land formed on the first flat portion where the second flat portion does not overlap, and a second press contact land formed on the second flat portion. It is characterized by consisting of.

Further, the flexible printed wiring board of the present invention has a plurality of flat portions mounted on each other; and corresponding lands formed on another flexible printed wiring board formed on each of the plurality of flat portions. And a press contact land to be pressed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on illustrated embodiments. FIG. 1 is an exploded perspective view showing a main part of a camera on which a flexible printed wiring board (hereinafter, referred to as “flexible PWB”) to which the present invention is applied, and FIG. FIG. 3 is an exploded plan view showing a flexible PWB 40 to which the invention is applied, and FIG. 3 is a perspective view showing a state before a part of the flexible PWB 40 shown in FIG. 1 is bent.

In this embodiment, a flexible PWB 40 to which the present invention is applied and a flexible PWB 30 provided separately from the flexible PWB 40 are sandwiched between two press-contact members (a rectangular plate portion 13 and a holding plate 20). The lands (pressing lands) provided on the flexible PWBs 30 and 40 are pressed against each other to conduct electricity. Hereinafter, this configuration will be described in detail.

The frame 10 is a camera component fixed inside the compact camera, is integrally formed of a synthetic resin material, and has a cylindrical portion 11 serving as a fixed barrel of a lens barrel at the center thereof. The cylindrical portion 11 has rectangular plate portions 12 and 13 on both sides. Two flexible PW
B30 and B40 are sandwiched between one rectangular plate portion 13 (pressure contact member) and a holding plate 20 (pressure contact member) provided separately from the rectangular plate portion 13.

A rectangular opening 13a is formed in the center of the rectangular plate portion 13 along the longitudinal direction thereof, and a part of the front surface of the rectangular plate portion 13 facing the holding plate 20 has this opening 13a. A pressure contact surface 13b is formed along the periphery. The press contact surface 13b is formed as a narrow surface whose entire surface is located on the same plane and whose planar shape approximates the shape of the arithmetic numeral "7". Two flexible PWBs 30, 40 are provided between the press contact surface 13b having such a narrow width and a surface of the press plate 20 opposite to the press contact surface 13b (a surface opposite to the surface shown in FIG. 1).
Is sandwiched.

Two engaging pins 13c and 13d projecting from a part of the press contact surface 13b are implanted in the rectangular plate portion 13, and these two engaging pins 13c and 13d are implanted.
Screw holes 13e and 13f are formed in the vicinity of each of. In the rectangular plate portion 13, two holes are formed on the side opposite to the side where the screw holes 13e and 13f are formed with the opening 13a interposed therebetween.
Three screw holes 13g and 13h are formed. Further, an engagement pin 13i is implanted in the rectangular plate portion 13 near the screw hole 13g. The holding plate 20 has the four screw holes 13 e formed in the rectangular plate portion 13,
Four screw holes 20a, 20b, 20c, and 20d corresponding to 13f, 13g, and 13h, respectively, are formed. Further, the holding plate 20 is formed with three engagement holes 20f, 20g, and 20h for engaging the three engagement pins 13c, 13d, and 13i implanted in the rectangular plate portion 13, respectively.

A rubber plate 22 (see FIG. 6) is fixed to the holding plate 20 on a surface of the pressing plate 20 that faces the rectangular plate portion 13 between the two screw holes 20c and 20d. The rubber plate 22 has a uniform thickness that slightly protrudes from the surface (the lower surface in FIG. 6) of the holding plate 20 facing the rectangular plate portion 13 (the lower surface in FIG. 6). And flexible PWB3 stacked on top of each other
The pressure contact land 32 of the flexible PWB 40 and the pressure contact land 32 (second pressure contact land) 72 of the flexible PWB 40 are sandwiched between the pressure contact surface 22a and the pressure contact surface 13b of the rectangular plate portion 13 to be pressed. Therefore, the press contact land 32 and the press contact land 72
The rubber plates 22 are strongly pressed against each other by the elastic force.

The pressing plate 20 also has a rubber plate 24 similar to the rubber plate 22 on the surface between the two screw holes 20a and 20b on the side facing the rectangular plate portion 13.
Is fixed. Like the rubber plate 22, the rubber plate 24 slightly protrudes from the surface (the lower surface in FIG. 7) of the holding plate 20 facing the rectangular plate portion 13 (the lower side in FIG. 7). The press contact lands 31 of the flexible PWB 30 and the press contact lands of the flexible PWB 40 (first
The pressure contact land) 52 is sandwiched between the pressure contact surface 24a and the pressure contact surface 13b of the rectangular plate portion 13 to be brought into pressure contact with each other.
Therefore, the pressing lands 31 and the pressing lands 52 are
Are strongly pressed against each other by the elastic force of.

The flexible PWB 40 has a predetermined pattern (conductive pattern) formed on one surface (the surface on the side shown in FIG. 2), and one end (not shown) of the flexible PWB 40 has a predetermined circuit inside the camera. Intermediate flexible part 41 connected to
And a first flexible portion 43 and a second flexible portion 45 which are bifurcated from the other end of the intermediate flexible portion 41. In the first flexible portion 43, two bent portions that are bent when mounted, that is, a first bent portion 43a and a second bent portion 43b are determined in advance. In the second flexible portion 45, two bent portions that are bent when mounted, that is, a third bent portion 45a and a fourth bent portion 45b are determined in advance. In FIG. 2, the first bent portion 43a is folded in a mountain, the second bent portion 43b is folded in a valley, the third bent portion 45a is folded in a mountain, and the fourth bent portion 45b is folded in a valley.

The flexible PWB 40 has the shape shown in FIG. 1 by appropriately bending each of the first to fourth bent portions 43a to 45b in a predetermined direction. FIG. 3 shows a third embodiment of the flexible PWB 40 shown in FIG.
This shows a state before bending the bent portion 45a.

The portion from the second bent portion 43b of the first flexible portion 43 to the distal end portion 43c of the first flexible portion 43 is a first flat portion 44 arranged along the pressure contact surface 13b of the rectangular plate portion 13. Is configured as The portion from the fourth bent portion 45b of the second flexible portion 45 to the tip portion 45c of the second flexible portion 45 is configured as a second flat portion 46 which is mounted on a part of the first flat portion 44. Have been.

As can be seen from FIGS. 1 to 5,
The planar shape and size of the second planar portion 46 are the same as those of the second planar portion 4.
The planar shape and the size of a part of the first planar portion 44 where the 6 overlaps are substantially the same. Therefore, as shown in FIG.
When the flat portion 46 is overlaid on the first flat portion 44, the second flat portion 46 is substantially aligned with a part of the first flat portion 44. As described above, the planar shape and the size of the second planar portion 46 are made substantially the same as the planar shape and the size of a part of the first planar portion 44 on which the second planar portion 46 is superimposed. 46 first
When superimposing on the flat part 44, the positioning of the second flat part 46 with respect to the first flat part 44 can be easily performed visually.

As shown in FIG. 4, the first flat portion 44 of the first flexible portion 43 has one surface (the surface on the side shown in FIG. 4).
A predetermined pattern 50 extending from the intermediate flexible portion 41 is formed over substantially the entire surface of the substrate. This pattern 50
It consists of four independent lines (wirings).
Each end of these four lines on the first flat portion 44 is formed as a land (check land) 51 for pattern inspection near the front end 43c.

In the first flat portion 44, a press contact land 52 is formed near the check land 51 so as to press against the corresponding press contact land 31 (see FIG. 1) formed on the flexible PWB 30. The press contact lands 52 include four land portions formed by exposing a part of each of the four lines constituting the pattern 50. These four lands are respectively pressed against the four lands forming the press contact lands 31 formed on the flexible PWB 30.

The first flat portion 44 has a press contact land 52.
Screw insertion holes 5 respectively corresponding to the screw holes 13e and 13f formed in the rectangular plate portion 13 on both sides in the longitudinal direction of
4a and 54b are formed. In addition, each screw insertion hole 5
In the vicinity of 4a, 54b, engagement holes 55a, which fit into engagement pins 13c, 13d formed in the rectangular plate portion 13, respectively.
55b are formed. Insertion hole 54 of first flat portion 44
In the part from the part where b was formed to the tip part 43c,
The second flat portions 46 do not overlap, and the flexible PWB 30 directly overlaps

The first flat portion 44 has a second flat portion 46.
Are formed in a portion where... Overlap with each other, the pattern 60 being composed of a total of ten lines substantially parallel to each other. As can be seen from FIG. 4, only four lines out of the ten lines included in the pattern 60 are necessary lines for wiring,
The remaining six lines are unnecessary lines (dummy lines) for wiring. The ten lines of the pattern 60 constitute the press contact lands 72 formed at the corresponding positions of the second flat portion 46 in a state where the second flat portion 46 is overlapped with a part of the first flat portion 44. The press-contact lands 72 are formed at the same intervals as the ten lines so as to be aligned with the ten lines (ten lands). That is,
The ten lines of the pattern 60 correspond to one of the press-contact lands 72 in a state where the second plane portion 46 is superimposed on the first plane portion 44.
They are arranged so that the zero line and the plane position coincide with each other.

As described above, the pattern 60 is composed of four lines necessary for wiring and six dummy lines unnecessary for wiring.
The unevenness of the second flat portion 46 of the press contact land 72 is eliminated, and the press contact land 72 is replaced with the corresponding press contact land 32 formed on the flexible PWB 30 (see FIG. 1).
(See Reference).

As shown in FIG. 5, the second flat portion 46 of the second flexible portion 45 has one surface (the surface on the side shown in FIG. 5).
A predetermined pattern 70 extending from the intermediate flexible portion 41 is formed over substantially the entire surface of the. This pattern 70
It consists of ten independent lines. Each end of these ten lines on the second plane portion 46 is
It is formed as a land for pattern inspection (land for check) 71.

The second flat portion 46 has a flexible P
The above-mentioned press contact lands 72 that are pressed against the corresponding press contact lands 32 formed on the WB 30 are formed. The press contact lands 72 include ten lands formed by exposing a part of each of ten lines constituting the pattern 70. These ten lands are respectively pressed against the corresponding ten lands of the pressed lands 32 formed on the flexible PWB 30.

The second flat portion 46 has a press contact land 72.
Is formed in the vicinity of. This engagement hole 74
In the state where the second flat portion 46 is overlaid on the first flat portion 44, the second flat portion 46 coincides with the engagement hole 57 formed at a corresponding position of the first flat portion 44. The second flat portion 46 has a tip portion 45.
In the vicinity of c, an engagement hole 75 that fits into the engagement pin 13d of the rectangular plate portion 13 is formed together with the engagement hole 55b of the first flat portion 44.

The flexible PWB 30 includes the flexible PWB 30 in the state shown in FIG.
When overlapped on the WB 40, the holes 34a, 34b, 34a, 34b,
35a, 36 and 35b are formed.

Flexible PWB 30 and Flexible P
The WB 40 is sandwiched between the rectangular plate 13 and the holding plate 20 in the following procedure. First, flexible PW
B40 is formed by bending each bent portion of the first bent portion 43a to the fourth bent portion 45b in the above-described predetermined bending direction into the shape shown in FIG. 1, and then, the engaging holes 55a are aligned with each other. Engagement holes 55b, 75, and engagement holes 5 aligned with each other
7, 74 are engaged with the engaging pins 13c, 1 on the rectangular plate 13.
3d and 13i are respectively engaged and installed on the press contact surface 13b. Subsequently, the flexible PWB 30 is inserted into the holes 35a,
35b and 36 are engaged with the engagement pins 13c, 13d and 13i, respectively, and are overlapped on the flexible PWB 40.

As described above, the flexible PWB 40 and the flexible PWB 40 are placed on the pressure contact surface 13b of the rectangular plate portion 13.
After stacking the WBs 30 in order, the holding plate 20 is connected to the engaging holes 20a, 20b, 20h by the engaging pins 13c, 13c.
d and 13i, respectively, and overlap on the flexible PWB 30. Then, the screw holes 20a, 20b, 20c, 2
0d, the fixing screws 80 (see FIGS. 6 and 7) are inserted into the corresponding holes of the flexible PWBs 30, 40, respectively, and the corresponding screw holes 13e, 13f, 13g, 13h.
To screw. As a result, the flexible PWB 30 and the flexible PWB 40 are sandwiched between the rectangular plate portion 13 and the holding plate 20, and thus the flexible PWB
The press contact lands 52, 72 of the flexible PWB 30 are pressed via the rubber plates 24, 22.
Are pressed against each other.

In the present embodiment, since the pressure contact surface 13b of the rectangular plate portion 13 is narrow, the range in which the flexible PWB 30, 40 can be sandwiched between the corresponding rubber plate 22 and the rubber plate 24 can be pressed against the pressure contact surface 13b. Is limited to the width. For example, the first flexible part 4 is attached to the flexible PWB 40.
3 and the second flexible portion 45 are not provided.
Assuming that a single narrow flexible portion extending from the intermediate flexible portion 41 and disposed along the press contact surface 13b of the rectangular plate portion 13 is provided instead of the third and second flexible portions 45, Single flexible section on one side (Flexible P
On the surface facing the WB 30, all fourteen lines of the four lines of the first flexible part 43 (first planar part 44) and ten lines of the second flexible part 45 (second planar part 46) are provided. Therefore, it is impossible to provide the press contact lands corresponding to the press contact lands 52 and 72 in the present embodiment.

However, in this embodiment, the intermediate flexible portion 41
Since the first flexible portion 43 and the second flexible portion 45 are provided in a bifurcated structure extending from the first flexible portion 43 and the second flexible portion 45 is mounted on part of the first flexible portion 43, the width is narrow. The pressing lands 52 and the pressing lands 72 are provided along the simple pressing surface 13b.

In the above embodiment, the portion extending from the intermediate flexible portion 41 has a forked structure, and the first flexible portion 43 and the second
Although the flexible portion 45 is provided and the second flexible portion 45 is mounted on a part of the first flexible portion 43, the present invention is not limited to this embodiment, and extends from the intermediate flexible portion 41. The portion may be provided as a plurality of flexible portions having three or more legs, a press contact land may be provided for each flexible portion, and the flexible portions may be overlapped and arranged on the press contact surface 13b. In this case, the press-contact lands formed on each of the plurality of flexible portions are connected to the corresponding press-contact lands formed on the flexible PWB 30 in a state where the plurality of flexible portions are mounted on top of each other. Are formed on the same surface side opposite to and are formed at plane positions different from each other.

Although the above embodiment is an embodiment in which a flexible PWB to which the present invention is applied is provided inside a compact camera, the present invention is not limited to only this embodiment, and various electronic devices (watches and the like) other than a camera are provided. , Telephones, automobile electrical equipment, computers, etc.).

[0034]

As described above, according to the flexible printed wiring board to which the present invention is applied, the first flat portion and the second flat portion mounted on part of the first flat portion are provided. Since the press contact lands are composed of the first press contact lands formed on the first flat portion where the second flat portions do not overlap, and the second press contact lands formed on the second flat portion, Even when the width of each pressure contact surface is narrow, the pressure contact lands provided on each flexible printed wiring board can be reliably pressed against each other.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a main part of a camera on which a flexible printed wiring board to which the present invention is applied is mounted.

FIG. 2 is an exploded plan view showing the flexible printed wiring board to which the present invention shown in FIG. 1 is applied.

FIG. 3 is a perspective view showing a state before a part of the flexible printed wiring board shown in FIG. 1 is bent.

FIG. 4 is an enlarged plan view showing a part of the flexible printed wiring board shown in FIG. 3;

FIG. 5 is an enlarged plan view showing a part of the flexible printed wiring board shown in FIG. 3;

FIG. 6 is an exploded cross-sectional view showing how the flexible printed wiring boards are pressed against each other.

FIG. 7 is an exploded cross-sectional view showing how flexible printed wiring boards are pressed against each other.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Frame 11 Cylindrical part 13 Rectangular plate part (pressure contact member) 13b Pressure contact surface 20 Press plate (pressure contact member) 22 24 Rubber plate 30 40 Flexible printed wiring board 31 32 Pressure contact land 41 Intermediate flexible part 43 First flexible part 43a First Folded portion 43b Second bent portion 44 First flat portion 45 Second flexible portion 45a Third bent portion 45b Fourth bent portion 46 Second flat portion 51 71 Check land 52 Pressure contact land (first pressure contact land) 72 Press-contact land (second press-contact land) 80 Fixing screw

Claims (6)

[Claims] 1. A flexible printed wiring board having a press contact land pressed against a corresponding land formed on another flexible printed wiring board, wherein the first flat portion and a part of the first flat portion are mounted on top of each other. A press contact land formed on the first flat portion where the second flat portion does not overlap, and a second press contact land formed on the second flat portion. A flexible printed wiring board comprising two press-contact lands. 2. The flexible printed wiring board according to claim 1, wherein the first press contact land and the second press contact land are:
A flexible printed wiring board formed on the same surface as the another flexible printed wiring board in a state where the second flat part is overlapped with a part of the first flat part. 3. The flexible printed wiring board according to claim 1, wherein each of the first press-contact lands and the second press-contact lands comprises a plurality of lands arranged at predetermined intervals. Printed wiring board. 4. The flexible printed wiring board according to claim 1, wherein a planar shape and a size of the second planar portion are different from those of the first planar portion on which the second planar portion overlaps. A flexible printed wiring board that is substantially the same in some planar shapes and sizes. 5. A plurality of flat portions mounted on top of each other; a press contact land formed on each of the plurality of flat portions and pressed against a corresponding land formed on another flexible printed wiring board; A flexible printed wiring board characterized by having: 6. The flexible printed wiring board according to claim 5, wherein the press-contact lands formed on each of the plurality of flat portions are provided in a state where the plurality of flat portions are mounted on top of each other. A flexible printed wiring board formed on the same surface side facing another flexible printed wiring board so as to be in pressure contact with a corresponding land formed on the flexible printed wiring board, and formed at different plane positions from each other.