JPH07294792A - Holding structure for flexible printed board - Google Patents

Abstract

PURPOSE:To constitue a flexible printed board with an improved wiring efficiency, to store the board in a desired space and also to prevent the occurrence of noise between a wiring part and electrical parts. CONSTITUTION:The flexible printed board 1 stored in a lens barrel 3 is provided with a flat part 9b on which the electrical parts are mounted and a belt-like part 8 formed to a shape like a belt and for connecting between the flat parts, and the board 1 is stored in the lens barrel while being bent into a polygonal cylindrical shape with a plate-like pedestal 2 formed of a conductive member. As for the state of the stored board, the flexible printed board 1 is bent in a superposed state so that the inner surface and outer surface of the pedestal 2 may be held between the belt-like part 8 and the flat part, and then, the board is formed cylindrically and arranged nearly parallel to the optical axis of the lens barrel 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for holding a flexible printed circuit board arranged in a lens barrel having a photographing optical system.

[0002]

2. Description of the Related Art Conventionally, various types of flexible printed circuit boards arranged inside a cylindrical casing such as a lens barrel having a photographing optical system have been proposed.
In Japanese Patent No. 6190, in order to store along a wall surface in a cylindrical or polygonal tubular casing, a substrate is bent into a substantially polygonal shape, and an electric component is mounted on a flat surface portion between the bent portions to describe the above. A flexible printed circuit board configured to be housed in a housing is disclosed.

Further, the present applicant has filed Japanese Patent Application No. 4-297385.
The flexible printed board to be housed inside the tubular casing has a strip-shaped portion and a projecting portion projecting in a direction orthogonal to the extending direction of the strip-shaped portion, and the projecting portion is directed toward the strip-shaped portion. By bending it approximately 180 ° to overlap with the band-shaped portion, and by bending the band-shaped portion into a polygonal shape in order to store this in a cylindrical housing, for example, in the lens barrel, along the wall surface in the lens barrel. We have proposed a flexible printed circuit board that can be housed in parallel with the optical axis.

In the flexible printed circuit board having such a structure, by mounting an electric component or the like on the protruding portion and providing a wiring portion on the belt-shaped portion, the belt-shaped portion can be used to connect the component surfaces formed on the protruding portion. In this case, since a sufficient wiring space can be secured, there is an effect that a board such as a wiring pattern can be easily designed. It is also possible to unitize the component surface and apply it to various lenses.

[0005]

In the flexible printed circuit board having the above-mentioned structure, since the wiring part and the electric part are close to each other when housed in the cylindrical casing, There is a possibility that the electric parts may affect each other electrically. That is, in a case where a strip-shaped substrate is simply folded into a polygonal shape and accommodated, the electric parts and the wiring portion are provided in the vicinity to complicate wiring, and in a case where the strip-shaped substrate and the projection portion are folded, the housing is folded. When housed inside, the strip portion and the protruding portion overlap each other and the wiring portion and the electrical component are in approximate contact with each other, so that the wiring portion and the electrical component are likely to exert an electrical influence. Therefore, there is a problem in that the circuit may malfunction due to the generation of noise due to the interaction between the wiring portion and the electric component.

The present invention has been made in view of these circumstances, and it is possible to construct the wiring efficiently and store it in a desired space, and to prevent an adverse effect between the wiring portion and the electric parts. It is an object of the present invention to provide a flexible printed circuit board holding structure capable of performing the above.

[0007]

According to the present invention, there is provided a flexible printed circuit board holding structure for accommodating a flexible printed circuit board outside a photographing light beam passing through the photographing optical system in a lens barrel having a photographing optical system. A strip-shaped portion provided on the flexible printed circuit board and extending in a predetermined direction; and a strip-shaped portion provided on the flexible printed circuit board, protruding from the strip-shaped portion in a direction orthogonal to the extending direction of the strip-shaped portion, and having an electric component on the surface. And a cylindrical member provided in the lens barrel and arranged substantially parallel to the optical axis of the photographing optical system. The cylindrical member is provided in the circumferential direction of the cylindrical member. It is configured such that the extending direction of the strip-shaped portion is provided and the inner surface and the outer surface of the tubular member are sandwiched between the strip-shaped portion and the flat surface portion.

[0008]

When the flexible printed circuit board is housed in the lens barrel, the extending direction of the strip-shaped portion of the flexible printed circuit board is set in the circumferential direction of the tubular member, and the strip-shaped portion and the flat surface portion of the flexible printed circuit board are arranged. The inner surface and the outer surface of the tubular member are sandwiched.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 relate to a first embodiment of the present invention. FIG. 1 is a perspective view showing a state where the flexible printed circuit board of the present embodiment is housed in a lens barrel, and FIG. 2 shows a developed shape of the flexible printed circuit board. FIG. 3 is a developed view showing a developed shape of a pedestal for holding the flexible printed circuit board, and FIG. 4 is a cross-sectional view showing a sectional configuration in an assembled state when the flexible printed circuit board and the pedestal are housed in the lens barrel. FIGS. 5A and 5B are configuration explanatory views showing a sectional configuration in a state where a lens barrel having a flexible printed board built therein is attached to a camera body.

The flexible printed circuit board of this embodiment is
It is a foldable substrate to be housed in a tubular housing, and has a structure in which it is housed in a tubular housing in a state of being bent in a polygonal shape together with a plate-shaped holding member made of a conductive material.

In this embodiment, an example of the structure in which the flexible printed board is housed in the lens barrel of the camera will be described. FIG. 1 shows a state in which the flexible printed circuit board is housed in the lens barrel.

The flexible printed circuit board 1 is provided with a plate-shaped pedestal 2 as a holding member for holding the flexible printed circuit board 1, and is formed by bending a substantially strip-shaped product into a polygonal cylindrical lens. The lens barrel 3 is housed in the outer frame 4. A photographic lens 5 is provided inside the lens barrel 3, and the flexible printed circuit board 1 is arranged in a region inside the outer frame 4 outside a region through which the photographic light flux 6 passes. In addition, reference numeral 7 in the drawing
Indicates the shooting surface.

The flexible printed circuit board 1 has an unfolded shape as shown in FIG. 2, and has a band-shaped portion 8 formed in a band shape and a protrusion formed in one side in a direction orthogonal to the longitudinal direction of the band-shaped portion 8. It has the plane parts 9a, 9b, and 9c. Electrical components 10a to 10f are mounted on the plane portions 9a, 9b, 9c,
The strip-shaped portion 8 has a wiring pattern 11 that constitutes an electric circuit.
Is provided. In addition, the flat portions 9a, 9b, 9c
The bent portions 12a to 12c indicated by broken lines in the figure
However, the band-shaped portion 8 is formed with bent portions 13a to 13f, and when the flexible printed circuit board 1 is housed in the lens barrel 3, these bent portions 12a to 12c and 13 are formed.
It can be bent by a to 13f.

The pedestal 2 holding the flexible printed board 1 is made of a conductive member, for example, a plate-shaped member made of a metal plate, and has a developed shape as shown in FIG. The pedestal 2 is formed in a strip shape having a width substantially corresponding to the projecting length of the flat surface portions 9a, 9b, 9c of the flexible printed circuit board 1, and as shown by the broken line in the figure, the spacing between the bent portions 13a to 13f is set. Bend 1 at approximately the same interval
4a to 14f are provided. When the pedestal 2 is housed in the lens barrel 3, the pedestal 2 is bent by the bent portions 14a to 14f and formed into a polygonal prism shape, and is housed together with the flexible printed circuit board 1 as a tubular member. .

Further, there are provided claw portions 15a to 15e which are alternately projected and formed in a direction orthogonal to the longitudinal direction of the pedestal 2, and the claw portions 15a to 15a when housed in the lens barrel 3 are provided.
5e base end portions 16a to 16e and bent portions 14a to 14f
Is bent to hold the flexible printed circuit board 1 as a restraining member. At this time, the claw portion 1
The flexible printed circuit board 1 is held and restrained by the pedestal 2 by 5a to 15e so that the flexible printed circuit board 1 does not shift in the optical axis direction within the lens barrel 3 and does not spread in the radial direction.

Next, the flexible printed board 1 when the flexible printed board 1 is stored in the lens barrel 3
A method of assembling the pedestal 2 will be described.

First, the flexible printed circuit board 1 is made such that the strip-shaped portion 8 is in contact with one surface of the pedestal 2 so that the edges of the strip-shaped portion 8 on the side of the flat portions 9a to 9c are aligned with the side edges of the pedestal 2.
The base end portion 16 of the claw portions 15b and 15d of the pedestal 2
B and 16d are bent approximately 180 degrees to form a flat portion 9 of the strip portion 8.
The end portions on the a to 9c side are held by the claw portions 15b and 15d.

Next, the flat surface portions 9a, 9b, 9c of the flexible printed circuit board 1 are bent along the bent portions 12a to 12c by about 180 ° with the component surface facing outward, and the flat surface portions 9a to 9c are bent.
9c and the belt-shaped portion 8 sandwich the pedestal 2 so as to sandwich the flat surface portions 9a to 9a.
c and the strip | belt-shaped part 8 are piled up. As a result, as shown in FIG. 4, the electric component 10 (representative of 10a to 10f).
The pedestal 2 is arranged between the flat surface portion 9 (representing 9a to 9c) on which the slab is mounted and the strip-shaped portion 8, and the flat surface portions 9a to 9c are pedestal so that the strip-shaped portion 8 contacts one surface of the pedestal 2. It is arranged on both surfaces of the pedestal 2 so as to contact the other surface of the pedestal 2. Then, the base end portion 16 of the claw portions 15a, 15c, 15e of the pedestal 2
a, 16c, 16e are bent by approximately 180 °, and as shown in FIGS. 1 and 4, the end portions of the plane portions 9a-9c are claw portions 15a,
It is held by 15c and 15e. Note that FIG. 4 is a view showing a cross-sectional shape of the flexible printed circuit board including the flat portion and the pedestal cut in a direction perpendicular to the longitudinal direction.

As shown in FIG. 1, the flexible printed circuit board 1 and the pedestal 2 thus formed in a substantially strip shape are bent so that the strip portion 8 faces inward and the component surfaces of the flat portions 9a to 9c face outward. Portions 13a to 13f and bent portions 14a to 14f
Bend along to form a hexagonal tube. In this state,
The strip-shaped portion 8 serving as a wiring portion on which the wiring pattern is formed extends along the circumferential direction of the pedestal 2, and as shown in FIG. 4, the pedestal 2 made of a conductive metal plate is sandwiched between the electrical components. Are arranged substantially parallel to the plane portions 9a to 9c on which is mounted.

The flexible printed circuit board 1 and the pedestal 2 which are assembled as described above and have a substantially hexagonal tubular shape are inserted from the rear of the lens barrel 3 and fixed screws (not shown) are attached to the fixed portion of the inner surface portion such as the outer frame 4. It is fixed by tightening it. Although not shown in particular, the pedestal 2 is grounded to the ground (for example, the outer frame 4) of the lens barrel 3.

FIG. 5 is a view showing a state in which the lens barrel 3 incorporating the flexible printed board 1 is attached to the camera body. The lens barrel 3 including the taking lens 5 is attached to the camera body 19. The photographic light flux 6 passing through the photographic lens 5 passes through the lens barrel 3 to reach a photographic surface (film surface) 7 in the camera body 19, and a subject image is formed on the film surface 7. The flexible printed circuit board 1 and the pedestal 2 in the lens barrel 3 are arranged in a space outside the photographing light beam 6 and inside the outer frame 4, and the flat surface and the flexible portion of the pedestal 2 in the shape of a polygonal cylinder. The plane portions 9a to 9c of the printed circuit board 1 are the photographing lens 5
Is arranged substantially parallel to the optical axis of.

As described above, in this embodiment, the flexible printed circuit board is provided with a flat portion on which a strip-shaped portion provided with a wiring portion and an electric component protruding in a direction orthogonal to the extending direction of the strip-shaped portion can be mounted. And is arranged so that the strip-shaped portion is in contact with one surface of a holding member formed in a cylindrical member having conductivity, and the flat portion is in contact with the other surface of the holding member. The flexible printed circuit board is formed so that the inner surface and the outer surface of the holding member are sandwiched between the flat surface portion and the strip portion by bending the flat portion toward the strip portion by about 180 ° and the flat portion overlaps with the strip portion. It is bent so as to be housed along the wall surface in the cylindrical housing.

With this structure, the flexible printed circuit board can be formed by the flat surface portion on which the electric component is mounted and the strip portion on which the wiring pattern is arranged, and the strip portion can be used as an area dedicated to the wiring pattern. Wiring between the components can be easily routed, the degree of freedom in wiring design is increased, and it is possible to mount higher-density electrical components and to design a board that efficiently and sufficiently secures performance. Further, since the flat portion and the strip portion can be arranged with the holding member having conductivity interposed therebetween, electrical influence between the wiring portion and the electric component, for example, generation of noise due to interaction between the wiring portion and the electric component. Etc. can be prevented.

Further, in this embodiment, since the flexible printed circuit board is held by the claw portions of the pedestal and the position of the flexible printed circuit board is regulated, the flexible printed circuit board moves due to the displacement of the printed circuit board after the assembly or the change of the bending shape. It is possible to prevent problems such as deformation and short-circuiting of parts.

Next, a second embodiment of the present invention will be described.

6 to 8 relate to the second embodiment of the present invention. FIG. 6 is a development view showing a developed shape of the flexible printed circuit board, and FIG. 7 shows a state in which the projecting pieces of the flexible printed circuit board of FIG. 6 are connected. FIG. 8 is a rear view showing the arrangement of the flexible printed circuit board and the pedestal in the assembled state when they are housed in the lens barrel.

The second embodiment is a partial modification of the structure of the flexible printed circuit board of the first embodiment. In the flexible printed circuit board, a connecting portion is further provided in addition to the strip-shaped portion as a portion for connecting the flat portions. This is an example provided. The other parts of the flexible printed circuit board and the structure of the other pedestal are the same as those in the first embodiment, and the description thereof is omitted here.

The flexible printed circuit board 31 has a developed shape as shown in FIG. 6, and in addition to the strip-shaped portion 38 and the flat surface portions 39a, 39b, 39c, the flat surface portions 39a to 39a are used as connecting portions for connecting the flat surface portions. It is configured to have projecting pieces 32a to 32d formed to project laterally with respect to the projecting direction of 39c. The protruding piece 32b is substantially L-shaped, and the protruding piece 32d.
Has a substantially U shape, and the adjacent flat portions 39a and 3a
When connecting 9b, 39b and 39c, the protruding piece 32
b and 32d are bent by the bent portions 33a and 33b, respectively, and as shown in FIG.
32c and solders 34, respectively.

Wiring patterns are arranged on the projecting pieces 32a to 32d, and the wiring pattern for connecting the flat portions 39a, 39b, 39c is constituted by the projecting pieces 32a to 32d by the configuration shown in FIG. Connection parts 35a, 35
and the flat portion 39a to the flat portion 38a.
The parts 39c are electrically connected.

When the lens barrel 3 is housed in the lens barrel 3, the flat portion 3 of the flexible printed circuit board 31 is used as in the first embodiment.
9a to 39c are bent at approximately 180 degrees at the bent portions 12a to 12c, and the pedestal 2 is sandwiched between the flat portions 39a to 39c and the strip portion 38, and the substantially strip-shaped flexible printed circuit board 31 and the pedestal 2 are folded. It is bent into a polygonal shape (substantially hexagonal tubular shape) by the bending portions 13a to 13f. In this state, as shown in FIG. 1, the strip portion is located on the inner surface side of the pedestal 2 and the flat portion is located on the outer surface side, so that the connecting portions 35a and 35b are provided with the flat portion on the outer surface side of the pedestal 2. Plane 39a on the surface side
39c will be electrically connected.

In the developed shape shown in FIG. 7, the connecting portions 35a, 35 formed by connecting the projecting pieces 32a to 32d.
The b is provided with a margin so as to be slightly longer than the length between the flat portions 39a and 39b and 39b and 39c, and is slightly slackened. Since the inner surface and the outer surface of the pedestal 2 formed into a cylindrical shape have different lengths in the circumferential direction and become longer on the outer peripheral side, the length of the strip portion 38 on the inner surface and the flat surface portion 39 on the outer surface.
If the lengths of a to 39c and the connecting portions 35a and 35b are the same, the length of the connecting portion on the outer peripheral side will be insufficient or the band-shaped portion will sag and interfere with the photographing light flux. It is also conceivable that the flat portions are connected by a lead wire or a separate flexible substrate after being formed into a tubular shape, but in this case, the cost is increased due to the production of separate parts.

Therefore, in this embodiment, the connecting portions 35a and 35b are formed by connecting the projecting pieces 32a to 32d so as to be slightly longer than the strip-shaped portion 38, so that the strip-shaped portion on the inner surface side when formed into a tubular shape. 38 and the connecting portions 35a, 3 on the outer surface side
5b can be arranged along the base 2 without any excess or deficiency. At this time, as shown in FIG. 6, by forming at least one of the protruding pieces into a substantially L-shape or a substantially U-shape, a separate component is not required and the length of the connecting portion after connection can be easily made between the flat portions. It can be longer than the length of the strip.

FIG. 8 shows the arrangement of the flexible printed circuit board and the pedestal which are assembled in a cylindrical shape so as to be housed in the lens barrel. The flexible printed circuit board and the pedestal are arranged at the rear end side (lens mirror). It is the figure seen from the lens rear) in the state where it was stored in the cylinder.

The strip-shaped portion 38 and the flat portion 39a sandwiching the pedestal 2
To 39c are overlapped on both sides, and the protruding piece 32b bent on the protruding piece 32a on the outer surface side is polymerized to be electrically and mechanically connected by the solder 34. By connecting these projecting pieces, a connecting portion that connects the flat portions on the outer surface side is configured, and the pedestal 2 is inserted between the connecting portion on the outer surface side and the band-shaped portion on the inner surface side to shield the mutual wiring. It The wiring provided in the strip portion 38 and the connecting portions 35a and 35b are, for example, one of the strip portion and the connecting portion having a signal line vulnerable to electromagnetic noise and the other having a signal line emitting a lot of electromagnetic noise for transmitting a high frequency digital signal or the like. To be provided.

According to the structure of the present embodiment, in addition to the effects of the first embodiment, a normal wiring having a high-frequency clock line which generates a lot of noise or an analog line which is easily affected by noise in a strip-shaped portion. Apart from this, the flat portions can be connected to each other by pulling out at the connecting portion, and the pedestal can prevent mutual electrical influences of the wiring of the inner surface side and the outer surface side wiring. In addition, when connecting the flat parts on which the electrical parts are mounted on both the inner surface side and the outer surface side of the pedestal, it is possible to easily adjust the length of the connecting portion on the inner surface side and the outer surface side of the pedestal without providing a separate member. Can absorb the difference. As a result, an electrically stable operation can be performed at low cost.

9 and 10 show a modified example of the flexible printed circuit board in which the structure of the connecting portion for connecting the flat portions is changed.

Flexible printed circuit board 4 of this modification
1 has a developed shape as shown in FIG. 9, and in addition to the strip-shaped portion 48 and the flat portions 49a, 49b, 49c, a strip-shaped connecting portion that connects flat portions formed in parallel with the strip-shaped portion 48. It has 42a and 42b. That is,
Unlike the configuration in which the protruding pieces are connected in the second embodiment, a connecting portion that is integrally formed is provided from the beginning.

In this structure, when the flexible printed circuit board is formed into a tubular shape together with the pedestal when it is housed in the lens barrel, the inner surface and the outer surface of the pedestal 2 have different circumferential lengths as described above, so that the connecting portion 42a is formed. , 42b is set appropriately, the length of the belt-shaped portion 48 is excessively slack. However, as shown in FIG. 10, by folding the belt-shaped portion 48 on the inner surface side so as not to be exposed to the photographing light beam, the second embodiment The same effect as can be obtained.

Next, a modified example in which the shape of the tubular member as the holding member for holding the flexible printed circuit board is changed will be described with reference to FIG. FIG. 11 is a view showing an arrangement configuration in a state where the flexible printed circuit board is formed into a cylindrical shape together with a pedestal which serves as a holding member when the flexible printed circuit board is housed in the lens barrel, and an end portion of the cylindrical member is viewed from the rear side. It is a thing.

In the first embodiment, the pedestal is not limited to the one formed in the shape of a polygonal cylinder, but it is also possible to use one in which one or both of the outer circumference and the inner circumference are formed in a cylindrical shape.

FIG. 11A shows a first modified example of the holding member, in which a pedestal 52a having both a cylindrical inner peripheral portion and a cylindrical outer peripheral portion is provided. When it is housed in the lens barrel, as in the first embodiment, the flat portion 8 of the flexible printed circuit board 1 is in contact with the surface of the pedestal 52a on the inner peripheral side, and a plane on which the electric components 10a to 10f are mounted. The portions 9a to 9c are arranged so as to be in contact with the outer peripheral surface of the pedestal 52a, and the pedestal 5 includes the strip portion 8 and the flat surface portions 9a to 9c.
Flexible printed circuit board 1 is formed so as to sandwich both sides of 2a. In this example, a part of the inner surface of the flat surface portions 9a to 9c on the side opposite to the component mounting surface and the outer peripheral surface of the pedestal 52a are bonded by the bonding adhesive 53, and the flexible printed circuit board 1 is fixed to the pedestal 52a. It is like this.

FIG. 11 (b) shows a second modified example of the holding member, which uses a pedestal 52b in which only the outer peripheral portion has a cylindrical shape and the inner peripheral portion has a polygonal columnar shape. It is an example. Also in this second modification, as in the first embodiment,
When housed in the lens barrel, the flat surface portions 9a to 9c on which the electric components are mounted are mounted on the pedestal 52b so that the strip-shaped portion 8 of the flexible printed circuit board 1 contacts the inner peripheral surface of the pedestal 52b.
The flexible printed circuit boards 1 are arranged on both sides of the pedestal 52b so as to be in contact with the outer peripheral surface of the pedestal, that is, so that the pedestal 52b is sandwiched between the strip portion 8 and the flat surface portions 9a to 9c. Further, similar to the first modification, the flat surface portions 9a to 9a.
Part of the inner surface of 9c opposite to the component mounting surface and the outer peripheral surface of the pedestal 52b are adhered and fixed by a fixing adhesive 53.

FIG. 11C shows a third modified example of the holding member, which uses a pedestal 52c having a polygonal columnar outer peripheral portion and a cylindrical inner peripheral portion only. It is an example. Also in this third modification, as in the first embodiment,
When the flexible printed circuit board 1 is housed in the lens barrel, the flat portions 9a to 9c on which the electric parts are mounted are mounted on the pedestal 52 of the flexible printed circuit board 1 so that the strip-shaped portion 8 contacts the inner peripheral surface of the pedestal 52c.
It is arranged so as to be in contact with the outer peripheral surface of c, and has a structure in which both sides of the pedestal 52c are sandwiched by the strip-shaped portion 8 and the flat surface portions 9a to 9c. Further, in this example, the flat surface portion 9a of the strip portion 8 is
The surface on the outer peripheral side of the portion overlapping with .about.9c and the inner peripheral surface of the pedestal 52c are adhered and fixed by the adhesive 53 for fixing.

Even in the modified example in which the structure of the holding member is changed, the same effect as that of the first embodiment can be obtained.

Next, a third embodiment of the present invention will be described.

12 and 13 relate to the third embodiment of the present invention. FIG. 12 is a developed view showing the developed shape of the flexible printed circuit board, and FIG. 13 is a view showing the flexible printed circuit board and the pedestal housed in the lens barrel. It is a rear view which shows the arrangement structure in the state assembled.

The third embodiment is a partial modification of the structure of the flexible printed circuit board of the first embodiment, and is an example in which the protruding direction of the flat portion of the flexible printed circuit board from the belt-shaped portion is changed. The other parts of the flexible printed circuit board and the structure of the other pedestal are the same as those in the first embodiment, and the description thereof is omitted here.

The flexible printed circuit board 61 is shown in FIG.
In the developed shape as shown in FIG. 5, the belt-shaped portion 68 and the flat surface portion 69a formed in a direction orthogonal to the longitudinal direction of the belt-shaped portion 68 and projecting laterally in the opposite direction to the first embodiment,
It is configured to have 69b and 69c. Electrical components 10a to 10f are mounted on the plane portions 69a, 69b, 69c, as in the first embodiment.

When accommodating the flexible printed circuit board 61 thus constructed in the lens barrel, as shown in FIG. 13, the flat surface portions 69a, 69 of the circuit board are arranged on the inner peripheral side of the pedestal 2.
b and 69c can be arranged. FIG. 13 shows an arrangement configuration in which the flexible printed circuit board and the pedestal shown in the first embodiment are assembled in a tubular shape, and is a view of the flexible printed circuit board and the pedestal viewed from the rear end side.

Similar to the first embodiment, the plane portions 69a to 69c of the flexible printed circuit board 61 are bent and arranged so that the pedestal 2 is sandwiched between the plane portions 69a to 69c and the strip-shaped portion 68, and then the flexible printed circuit board. 61 and the pedestal 2 are bent into a polygonal shape to be molded. In the present embodiment, the strip-shaped portion 68 and the flat surface portions 69a to 69c are superposed on both sides of the pedestal 2 while being assembled in a polygonal tubular shape, and the flat surface portions 69a to 69c are arranged on the inner peripheral side. It will be configured.

Further, the flexible printed circuit board 61 of the third embodiment may be used in combination with the pedestals 52a, 52b and 52c which are modified examples of the holding member shown in FIG. FIG. 14 shows an arrangement configuration in which the flexible printed board 61 is formed in a tubular shape together with the pedestals 52a, 52b, 52c of the modified example. FIG. 14 is a rear view of the end of the tubular member.

FIG. 14A shows the pedestal 52 of the first modification.
It shows an example in which the flexible printed circuit board 61 is formed in a cylindrical shape by using a. In this example, the strip-shaped portion 68 of the flexible printed circuit board 61 is in contact with the outer peripheral surface of the pedestal 52a whose inner and outer peripheral portions are both formed in a cylindrical shape, and the inner peripheral surface of the pedestal 52a is Is an electrical component 1
The flat portions 69a to 69c on which the 0a to 10f are mounted are arranged so as to be in contact with each other, and are formed so that the strip-shaped portion 68 and the flat portions 69a to 69c sandwich both sides of the pedestal 52a. In addition, a part of the inner peripheral surface of the portion of the strip portion 68 that overlaps the flat portions 69a to 69c and the outer peripheral surface of the pedestal 52a are adhered and fixed by the adhesive 53, and the flexible printed circuit board 61 is attached to the pedestal 52a. Fixed.

FIG. 14B shows the pedestal 52 of the second modification.
It shows an example in which the flexible printed circuit board 61 is formed in a cylindrical shape by using b. In this example, similarly to the example shown in (a), the flat surface portion 69a to the inner peripheral surface of the pedestal 52b, which has a cylindrical outer peripheral portion and a polygonal columnar inner peripheral portion.
The strip portion 68 and the flat surface portion 69a are arranged so that 69c is arranged.
To 69c are arranged so as to sandwich both surfaces of the base 52b.

FIG. 14C shows the pedestal 52 of the third modification.
It shows an example in which the flexible printed circuit board 61 is formed in a cylindrical shape by using c. In this case as well, the pedestal 52 having a polygonal columnar outer periphery and a cylindrical inner periphery is similarly provided.
The strip-shaped portion 68 and the flat surface portions 69a to 69c are arranged so that the flat surface portions 69a to 69c are arranged on the inner peripheral surface of c.
The configuration is such that both sides of c are sandwiched. In this example, the surfaces of the flat portions 69a to 69c on the side opposite to the component mounting surface and a part of the inner peripheral surface of the pedestal 52c are bonded and fixed by the bonding adhesive 53.

Even in the case where the component mounting surface of the flexible printed circuit board is arranged on the inner peripheral side of the holding member as in the third embodiment, the same effect as that of the first embodiment can be obtained.

Further, the flexible printed circuit board of the third embodiment can be applied to the structure of the second embodiment.

In each of the above-described embodiments, the structure of the flexible printed circuit board is not limited to that shown in the drawings, and the same may be applied to those in which the number of flat portions, the shape, the mounted electric parts, etc. are different. The effect is obtained. The shape of the flat surface portion may be another shape, or the shape of each flat surface portion may be different. Further, it may be configured such that the band-shaped portion of the substrate is located on the outer peripheral surface side and the flat portion is located on the inner peripheral surface side when housed in the tubular casing. Further, in the second embodiment, other shapes may be used as the shape of the protruding piece that connects the flat portions.

Further, the claw portion provided on the pedestal is not limited to the arrangement and shape shown in the figure, and various modifications are possible. Further, the claw portion may not be integrated with the pedestal, but may be constructed by a separate member and assembled.

The flexible printed circuit board holding structure in this embodiment is not limited to being housed in the lens barrel of a camera such as a single-lens reflex camera, but can be applied to the lens barrel of other devices. .

[Additional Notes] According to the embodiments of the present invention described in detail above, the following configurations can be obtained. (1) In a flexible printed circuit board holding structure for accommodating a flexible printed circuit board outside a photographing light flux passing through the photographing optical system in a lens barrel having the photographing optical system, the flexible printed circuit board is provided on the flexible printed circuit board. ,
A strip-shaped portion extending in a predetermined direction, a flat portion provided on the flexible printed circuit board, protruding from the strip-shaped portion in a direction orthogonal to the extending direction of the strip-shaped portion, and having an electric component mounted on its surface, and the lens. A cylindrical member provided in the lens barrel and arranged substantially parallel to the optical axis of the photographing optical system, and extending the extending direction of the belt-shaped portion along the circumferential direction of the cylindrical member. At the same time, a holding structure for a flexible printed circuit board is configured such that the inner surface and the outer surface of the tubular member are sandwiched between the strip-shaped portion and the flat portion.

(2) In a flexible printed circuit board holding structure in which a flexible printed circuit board is housed outside a photographing light flux passing through the photographing optical system in a lens barrel having a photographing optical system, provided on the flexible printed circuit board. Between the light flux passing portion through which the light flux of the photographing optical system passes and the outer periphery of the lens barrel, the plurality of optical components are arranged substantially parallel to the optical axis of the photographing optical system, and the electric components are mounted on the surface. A flat surface portion, a plurality of flat surface portions, connecting adjacent ones, a strip-shaped portion extending in a predetermined direction, and a connecting portion that connects the plurality of flat surface portions at a position different from the strip-shaped portion, A cylindrical member provided in the lens barrel and arranged substantially parallel to the optical axis of the photographing optical system,
A flexible print characterized in that the extending direction of the band-shaped portion is arranged along the circumferential direction of the tubular member, and the inner surface and the outer surface of the tubular member are sandwiched between the band-shaped portion and the flat surface portion. Substrate holding structure.

(3) In the above-mentioned appendix (1) or (2), at least one of the inner surface and the outer surface of the tubular member is in the shape of a polygonal column composed of a plurality of plane portions parallel to the optical axis of the photographing optical system. Has been formed.

(4) In the above-mentioned Supplement (1) or (2), a flat surface portion substantially parallel to the optical axis of the photographing optical system is formed on at least one of the inner surface and the outer surface of the tubular member.

(5) In the above-mentioned Supplement (3) or (4), a part of the flexible printed circuit board is arranged on the plane portion of the tubular member.

(6) In the appendix (5), a part of the flexible printed circuit board arranged on the flat surface portion is a flat surface portion of the flexible printed circuit board.

(7) In the supplementary note (1) or (2), the strip-shaped portion electrically connects the flat portion.

(8) In the appendix (1) or (2), the tubular member has conductivity.

(9) In the appendix (1), a plurality of the flat portions are provided, and at least one of the plurality of the flat portions has a substantially L-shaped or U-shaped connecting portion. The connecting portion is extended and bent in the circumferential direction of the tubular member, so that the flat surface portion of the tubular member is provided with the plurality of flat surface portions, and another flat surface portion is provided. Connected to.

(10) In the appendix (9), the connecting portion is connected to an adjacent flat surface portion.

(11) The aforementioned supplementary note (1) or (2)
In the above, a restraint member that restrains the flexible printed circuit board in the optical axis direction of the photographing optical system or in a direction perpendicular to the optical axis is provided.

(12) The aforementioned supplementary note (1) or (2)
In the above, the strip-shaped portion is provided with wiring for electrically connecting the flat portion.

(13) The supplementary note (2) or (9)
In the above, the strip-shaped portion and the connecting portion are provided with wiring for electrically connecting the flat portion.

(14) In the appendix (13), a signal line vulnerable to electromagnetic noise is provided on one of the strip portion and the connecting portion.

(15) In the appendix (14), a signal line that emits a lot of electromagnetic noise is provided on the other side of the belt-shaped portion and the connecting portion.

(16) In the above-mentioned supplementary note (15), the signal passing through the signal line that emits a lot of electromagnetic noise is a high frequency digital signal.

[0076]

As described above, according to the present invention, it is possible to construct a wiring efficiently and store it in a desired space, and to prevent an adverse effect between the wiring portion and the electric parts. There is an effect that it is possible to provide a flexible printed circuit board.

[Brief description of drawings]

1 to 5 relate to a first embodiment of the present invention,
FIG. 1 is a perspective view showing a state where the flexible printed circuit board of this embodiment is housed in a lens barrel.

FIG. 2 is a development view showing a development shape of a flexible printed circuit board in the first embodiment.

FIG. 3 is a development view showing a development shape of a pedestal that holds a flexible printed circuit board.

FIG. 4 is a cross-sectional view showing a cross-sectional configuration in the assembled state when the flexible printed circuit board and the pedestal are housed in the lens barrel in the first embodiment.

FIG. 5 is a structural explanatory view showing a sectional structure in a state where a lens barrel having a built-in flexible printed board is attached to a camera body

6 to 8 relate to a second embodiment of the present invention,
FIG. 6 is a development view showing the development shape of the flexible printed circuit board.

FIG. 7 is an explanatory view showing a state in which the protruding pieces are connected in the flexible printed board of FIG.

FIG. 8 is a rear view showing the arrangement configuration of the flexible printed circuit board and the pedestal in the assembled state when the flexible printed circuit board and the pedestal are housed in the lens barrel in the second embodiment.

FIG. 9 is a development view showing a development shape of a modified example of a flexible printed circuit board in which a configuration of a connecting portion that connects flat portions is changed.

FIG. 10 is a rear view showing an arrangement configuration of a flexible printed circuit board of a modified example together with a pedestal.

FIG. 11 is a rear view showing a modified example in which the shape of the holding member for holding the flexible printed circuit board is changed, showing the arrangement configuration in a state where the flexible printed circuit board and the pedestal are formed in a cylindrical shape.

12 and 13 relate to a third embodiment of the present invention, and FIG. 12 is a development view showing a development shape of a flexible printed circuit board.

FIG. 13 is a rear view showing the arrangement configuration of the flexible printed circuit board and the pedestal in the assembled state when the flexible printed circuit board and the pedestal are housed in the lens barrel in the third embodiment.

FIG. 14 is a rear view showing the arrangement of the flexible printed circuit board of the third embodiment and the pedestal of the modification of FIG. 11 formed in a tubular shape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Flexible printed circuit board 2 ... Pedestal 3 ... Lens barrel 6 ... Imaging luminous flux 8 ... Band-shaped part 9a, 9b, 9c ... Plane part 10a-10f ... Electrical parts 12a-12c, 13a-13f ... Bent part 15a-15e ... Claw

Claims (2)

[Claims] 1. A flexible printed circuit board holding structure for accommodating a flexible printed circuit board outside a photographing light flux passing through the photographing optical system in a lens barrel having the photographing optical system, wherein the flexible printed circuit board is provided on the flexible printed circuit board. A strip portion extending in a predetermined direction; a flat portion provided on the flexible printed circuit board, protruding from the strip portion in a direction orthogonal to the extending direction of the strip portion, and having an electric component mounted on a surface thereof; A cylindrical member provided in the lens barrel and arranged substantially parallel to the optical axis of the photographing optical system; and extending in the circumferential direction of the cylindrical member in the extending direction of the belt-shaped portion. In addition to, by the strip portion and the flat portion,
A holding structure for a flexible printed circuit board, characterized in that it is configured so as to sandwich the inner surface and the outer surface of the tubular member. 2. A flexible printed circuit board holding structure for accommodating a flexible printed circuit board outside a photographing light flux passing through the photographing optical system in a lens barrel having the photographing optical system, wherein the flexible printed circuit board is provided on the flexible printed circuit board. Disposed between the light flux passing portion through which the light flux of the photographing optical system passes and the outer circumference of the lens barrel, substantially parallel to the optical axis of the photographing optical system,
A plurality of flat portions on which electric components are mounted, a strip portion extending in a predetermined direction for connecting adjacent ones of the plurality of flat portions, and the plurality of flat portions at different positions from the strip portion. And a tubular member that is provided in the lens barrel and that is disposed substantially parallel to the optical axis of the photographing optical system, and a peripheral portion of the tubular member. Along the extending direction of the strip-shaped portion in the direction, in the strip-shaped portion and the plane portion,
A holding structure for a flexible printed circuit board, characterized in that it is configured so as to sandwich the inner surface and the outer surface of the tubular member.