JPH11204910A - Pressure welding structure of flexible printed-wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make feasible securely pressure welding corresponding pressure welding lands to respective pressure welding lands especially when respective pressure welding lands are composed of multiple lands in the connection structure of flexible printed-wiring board wherein two laminated flexible printed- wiring boards are held by two pressure welding members so as to pressure weld the pressure welding lands provided on respective flexible printed-wiring boards for conduction. SOLUTION: In a pressure welding structure of a flexible printed-wiring board having a structure mutually pressure welding pressure welding lands 32, 72 formed on respective surfaces of flexible printed-wiring boards 30, 40 after holding these boards 30, 40 between two pressure welding members 13, 40, a protrusion 13n protruding to pressure welding member 20 is formed on the laminated position of the mutually pressure welded two pressure welding lands 32, 72.

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 connection structure of a flexible printed wiring board, especially when each press contact land is composed of a large number of lands, there is a possibility that each press contact land does not reliably press against the corresponding press contact land.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a structure in which two superposed flexible printed wiring boards are sandwiched between two press-contact members to form each flexible printed wiring board. In the connection structure of a flexible printed wiring board, which presses the press-contact lands provided to each other and conducts them, even when each press-contact land comprises a large number of land portions, it is possible to surely press each press-contact land to the corresponding press-contact land. An object of the present invention is to provide a flexible printed wiring board that can be used.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a plurality of laminated flexible printed wiring boards are sandwiched between two press-contact members and formed on each of two overlapping flexible printed wiring boards of the plurality of flexible printed wiring boards which are in contact with each other. In the press-fitting structure of a flexible printed wiring board having a structure in which the press-contact lands are pressed against each other, one of the two press-contact members protrudes toward the other press-contact member at a position overlapping with the two press-contact lands pressed against each other. The protrusion is formed.

[0007]

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, and a part of the front surface of the rectangular plate portion 13 facing the holding plate 20 has the 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.

The rectangular plate portion 13 is provided with two engaging pins 13c and 13d protruding from a part of the press contact surface 13b, and these two engaging pins 13c and 13d.
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 between the two screw holes 20c and 20d on a side facing the rectangular plate portion 13. 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.

Similarly, the pressing plate 20 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 side (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 has a first flat portion 44 arranged along the press-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.

A press contact land 52 is formed near the check land 51 on the first flat portion 44 and is pressed 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 is provided with 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.

As described above, in the present embodiment, each press contact land 31, 32 is pressed against the corresponding press contact land 52, 72. In this embodiment, particularly, in the present embodiment, each press contact land 31, 32 is pressed.
In order to ensure that the press-contact 32 is pressed by the corresponding press-contact lands 52 and 72, the press-contact surface protrudes toward the press plate 20 at positions corresponding to the press-contact lands 52 and the press-contact lands 72 on the press-contact surface 13 b of the rectangular plate portion 13. A first projection row 13m and a second projection row 13n are provided.

The first projection row 13m is composed of four hemispherical projections arranged in a line along the longitudinal direction of the corresponding press contact land 52.
Are arranged in correspondence with the four lands constituting the above. Therefore, the four lands of the press-contact lands 52 are respectively raised toward the press-contact lands 31 by the four hemispherical projections of the first protrusion row 13m, and thus the four lands of the press-contact lands 31 are surely connected to the corresponding four lands. Press against

The second projection row 13n is composed of ten hemispherical projections arranged in a line along the longitudinal direction of the corresponding press contact land 72, and these ten hemispherical projections constitute ten press contact lands 72. Are arranged corresponding to the land portions. That is, they are arranged corresponding to the ten lines of the pattern 60 that match the press contact lands 72, respectively. Therefore, the ten land portions of the press-contact lands 72 are respectively protruded toward the press-contact lands 32 along with the ten lines of the pattern 60 by the ten hemispherical protrusions of the second protrusion row 13n. Press firmly against each land part (see FIG. 8). In FIG. 10, ten lands forming the press contact lands 72 are indicated by oblique lines, and in FIG. 11, these ten lands and ten hemispherical projections of the second projection row 13 n are shown to be overlapped. ing. The pressing lands 5 and the second projection rows 13n shown in FIG.
2 and the first projection row 13m also correspond to each other.

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 pressing 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. At this time, the press contact lands 31 and the press contact lands 52 are more reliably pressed by the rubber plate 24 and the first projection rows 13m. Similarly, the press contact lands 32 and the press contact lands 72 are more reliably pressed by the rubber plate 22 and the second projection rows 13n.

FIGS. 12 and 13 show the rectangular plate portion 13.
Instead of the second projection row 13n described above,
14 shows another embodiment in which a projection row 13n 'is formed.
In this embodiment, the second projection row 13n 'is
2 are respectively composed of ten hemispherical projections corresponding to the ten land portions, and these ten hemispherical projections are
The press-contact lands 72 on “b” are alternately arranged in a direction orthogonal to the longitudinal direction (vertical direction in FIG. 12). With such an arrangement, even when a plurality of lands forming the press-contact land 72 have a small distance from each other, each land of the press-contact land 72 can be reliably pressed against the corresponding land of the press-contact land 32. it can. According to the embodiment in which the second projection row 13n 'is formed, the same effect as in the above embodiment in which the second projection row 13n is formed can be obtained.

In each of the above embodiments, the first projection row 13m is constituted by four hemispherical projections corresponding to the four land portions of the press contact lands 52, and the second projection row 13n (or 13n) is formed.
Although n ′) is composed of ten hemispherical projections corresponding to the ten land portions of the press contact lands 72, the present invention is not limited to the number of these hemispherical projections. That is, the number of hemispherical protrusions may be determined according to the number of lands of the corresponding press contact lands.

In each of the above embodiments, the first projection row 13m and the second projection row 13n (or 13n ') are formed on the press-contact surface 13b side of the rectangular plate portion 13, and the rubber plates 22, 24 are formed on the holding plate 20 side. However, contrary to this configuration, the first projection row 13m and the second projection row 13n (or 13
n ′) is formed on the holding plate 20 side, and the rubber plates 22 and 2 are formed.
4 may be formed on the press-contact surface 13b side of the rectangular plate portion 13.

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

[0036]

As described above, according to the press-contact structure for a flexible printed wiring board to which the present invention is applied, one of the two press-contact members is placed at a position overlapping with the two press-contact lands pressed against each other, and the other press-contact member is pressed. Since the projection is formed so as to project toward the member, even when each of the press contact lands is composed of a large number of land portions, each press contact land can be reliably pressed against the corresponding press contact land.

[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.

FIG. 8 is a cross-sectional view showing a state in which the flexible printed wiring boards stacked on each other are difficult to be sandwiched between two press-contact members.

FIG. 9 is an enlarged plan view showing a main part of a press contact surface of one press contact member.

FIG. 10 is an enlarged plan view showing a second plane portion.

11 is a plan view showing a state in which a press contact land formed on a second flat portion shown in FIG. 10 and a plurality of protrusions formed on a press contact surface shown in FIG. 9 are overlapped with each other.

FIG. 12 is a plan view showing another embodiment of a plurality of protrusions formed on a press contact surface of one press contact member.

13 is a plan view showing a state in which a press contact land formed on a second flat portion shown in FIG. 10 and a plurality of protrusions formed on a press contact surface shown in FIG. 12 are overlapped with each other.

[Explanation of symbols]

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

Claims (6)

[Claims] A plurality of laminated flexible printed wiring boards are sandwiched between two press-contact members, and press-contact lands formed on respective mutually contacting surfaces of two overlapping flexible printed wiring boards among the plurality of flexible printed wiring boards are formed. In the pressure contact structure of a flexible printed wiring board having a structure in which the pressure contact members are pressed against each other, a protrusion protruding toward the other pressure contact member is formed on one of the two pressure contact members at a position overlapping with the two pressure contact lands pressed against each other. A press-fit structure for a flexible printed wiring board, characterized in that: 2. The pressure contact structure for a flexible printed wiring board according to claim 1, wherein the protrusion is a hemispherical protrusion. 3. The pressure contact structure for a flexible printed wiring board according to claim 1, wherein one of the press contact lands comprises a first plurality of lands formed at a predetermined interval, and the other press contact lands comprises The protrusion is formed of a second plurality of lands overlapping each of the one plurality of lands, and the protrusions formed on the one pressure contact member are respectively overlapped with the first and second plurality of lands overlapping each other. And a plurality of protrusions protruding toward the other press-contact member. 4. The pressure contact structure for a flexible printed wiring board according to claim 3, wherein each of the plurality of projections is a hemispherical projection. 5. The pressure contact structure for a flexible printed wiring board according to claim 1, wherein the other pressure contact member is made of an elastic material. 6. The pressure contact structure for a flexible printed wiring board according to claim 5, wherein the elastic material is a rubber material.