JPH06273653A - Flexible printed board - Google Patents

Abstract

PURPOSE:To provide the flexible printed board of high wiring efficiency. CONSTITUTION:A flexible printed board 5 to be arranged in a lens barrel having a photographing optical system is characterized by providing an annular part 16 formed into an annular shape having an aperture part, through which the luminous flux of the photographing optical system passes, at the center on a plane approximately perpendicular to the optical axis of this optical system, projecting board parts 6 to 8 which are projected outward from the annular part 16 and have electric parts 9 to 11 mounted and are extended in the direction of the optical axis to be bent to the annular part 16 at the time of storing the printed board in the lens barrel, contact parts 13 and 14 which are arranged on the annular part 16 and are electrically connected to other members, and bypass projecting board parts 17 and 18 which are projected to the outside of the arrangement parts of contact parts 13 and 14 in the annular part 16 and have wiring patterns 16A bypassing the contact parts 13 and 14.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, various kinds of flexible printed circuit boards arranged in a lens barrel having a photographing optical system have been proposed. For example, in Japanese Patent Laid-Open No. 63-166293, a rear portion of the lens barrel is generally provided. There is disclosed a technical means for accommodating a ring-shaped flexible printed circuit board and mounting an electric component on the substantially ring-shaped portion.

Further, in the technical means, a connecting portion for connecting with other components such as a mount is formed so as to project from the annular portion.

Further, in Japanese Utility Model Laid-Open No. 63-106190, electrical components are mounted on a strip-shaped flexible printed circuit board, and the flexible printed circuit board is bent in a polygonal shape in the direction parallel to the optical axis to form a cylindrical or polygonal shape. A technical means for housing along the inner wall surface of the housing has been proposed.

On the other hand, in Japanese Patent Application No. 5-54355, a substantially circle having a contact contact portion for pressure contact connection, which is arranged in a space formed by a lens barrel member and a lens mount side exterior member. A ring-shaped flexible printed circuit board has been proposed. A projecting substrate portion is formed on the substantially annular portion, an electric component is mounted thereon, and the projecting substrate portion is perpendicular to the optical axis so that the component mounting plane portion is substantially parallel to the optical axis. It is bent at the bent portion and housed in the lens barrel. As shown in FIG. 10, the flexible printed circuit board has a land portion 103 for pressure contact connection and a screw hole 104 for connection on a ring-shaped portion 102 of the flexible printed circuit board 101.

[0006]

However, the above-mentioned Japanese Laid-Open Patent Publication No. 63-166293 and Japanese Utility Model Laid-Open No. 63-1061.
According to the technical means disclosed in Japanese Patent Laid-Open No. 90, when the flexible printed circuit board is housed in a lens barrel having a lens having a large optical path diameter, the area of the circuit board becomes small, and a space for mounting an electric component and a wiring space are limited. However, it is necessary to drastically change the layout, and there is a possibility that the connection between the parts may become impossible.

Further, since the connecting wiring portion for connecting to other parts is pulled out to the outside, the wiring process and the board area are increased, resulting in an increase in cost.

Further, in the technical means disclosed in Japanese Utility Model Laid-Open No. 63-106190, since the flexible printed circuit board has a strip shape, when the number of parts to be mounted becomes large, wiring is blocked by the mounted parts and high-density mounting is possible. It will be difficult. In addition, the wiring between the end portions in the circumferential direction of the flexible printed board becomes large, and the wiring design efficiency deteriorates.

On the other hand, the flexible printed circuit board proposed in the above-mentioned Japanese Patent Application No. 5-54355, as shown in FIG. 10, has a land portion 103 for pressure contact connection and a screw hole 104 for connection on a ring-shaped portion 102. Is provided, the wiring space is reduced.

The present invention has been made in view of the above problems, and an object of the present invention is to solve the above problems and provide a flexible printed circuit board having a good wiring efficiency.

[0011]

In order to achieve the above object, a flexible printed circuit board according to the present invention is a flexible printed circuit board arranged in a lens barrel having a photographing optical system. On a plane substantially perpendicular to the optical axis, a first portion formed in an annular shape having an opening at the center through which the light flux of the photographing optical system passes, and protruding outward or inward from the first portion, A second part, which extends in the optical axis direction and bends with respect to the first part when the electrical parts are mounted and is housed in the lens barrel, and the second part is disposed in the first part, and other members are provided. And an electrical connection portion electrically connected to the first portion,
A third pattern in which a conductive pattern portion that projects outward or inward of the portion where the connection portion is provided and that bypasses the connection portion is provided.
And a portion.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a development view of a flexible printed circuit board showing a first embodiment of the present invention, and FIG. 2 shows a state in which the flexible printed circuit board of the first embodiment is stored in a lens barrel. It is the exploded perspective view shown.

This flexible printed circuit board 5 is formed in a substantially annular shape having an opening at the center thereof on a plane substantially perpendicular to the optical axis of the taking lens, through which the light flux of the taking lens passes. 16 and a plurality of projecting substrate parts 6, 7, 8 on the same plane as the ring-shaped part 16.
And the mount contact portion 15 is the annular portion 16 respectively.
It is formed so as to extend outward from.

Electrical components 9, 10, 11 are mounted on the front side of the drawing in the figure, and the projecting board portions 6, 7, 8 are mounted on the projecting board portions 6, 7, 8, respectively. At the base end of the, the bent portions 6A, 7A, 8 shown by the two-dot chain line in the figure
A is formed. These protruding substrate parts 6, 7 and 8 are
When the flexible printed circuit board 5 is housed in the lens barrel, the bent portions 6A, 7A, 8A are bent at approximately 90 ° toward the back surface of the drawing with respect to the annular portion 16 in the drawing. (See FIG. 2).

The mount contact portion 15 is a ring-shaped portion 1.
6 extends outward from a position different from the extending position of the projecting substrate portions 6, 7, and 8, and further, the tip portion is branched and extended into two parts in a partial arc shape, and the extension is performed. A plurality of contact points are arranged in the section. Then, when the mount contact portion 15 is housed in the lens barrel, the mount contact portion 15 is bent at a base end portion thereof in a direction different from that of the protruding substrate portions 6, 7, and 8 to form the ring-shaped portion 16. It is designed to be polymerized and attached (see FIG. 2).

Further, no electrical parts or the like are mounted on the annular portion 16 and only the wiring pattern is provided. In the figure, reference numerals 13 and 14 are contact contact portions for pressure contact connection with other circuits in the lens barrel. These contact points 1
The lenses 3 and 14 are disposed so as to be visible when the mount joint 19 (see FIG. 2) on the lens mount side, which will be described later, is removed after the lens barrel is assembled.

The contact contact portion 13 is arranged in the annular portion 16 near the mount contact portion 15, and the wiring pattern from the mount contact portion 15 is guided. Further, mounting screw holes 12 for the flexible printed circuit board 5 are formed in the central portions of the contact contact portion 13 and the contact contact portion 14 in the annular portion 16, respectively.

In the vicinity of the contact contact portion 13 and the contact contact portion 14 in the annular portion 16, detour projecting substrate portions 17 and 18 are formed to project outward. As shown in the drawing, a wiring pattern 16A that bypasses the contact contact portion 13 or the contact contact portion 14 is disposed on the bypass projecting substrate portions 17 and 18.

FIG. 2 shows an assembled state when the flexible printed circuit board 5 thus constructed is housed in the lens barrel. In the figure, reference numeral 19 is a mount joint portion on the lens mount side, and reference numeral 20. Is a lens barrel.

The lens barrel 20 is formed with an inward flange surface on the upper portion thereof, and openings of space portions 21, 22, 23 which are substantially parallel to the optical axis direction are formed in the flange surface. . As described above, the protruding substrate portions 6, 7, 8 of the flexible printed circuit board 5 are arranged on the back surface of the drawing in FIG. 1 with respect to the annular portion 16 at each of the bent portions 6A, 7A, 8A. It is bent approximately 90 ° toward the side, and the protruding substrate portions 6, 7, and 8 are fitted from the corresponding openings and housed in the space portions 21, 22, and 23.

At this time, the lower surface of the ring-shaped portion 16 of the flexible printed circuit board 5 is substantially in contact with the flange surface of the lens barrel 20, and the mount contact portion 15 has the circular shape. It is bent about 180 ° toward the upper surface of the ring-shaped portion 16 so as to be superposed and contacted with the upper surface of the ring-shaped portion 16.

Further, when the flexible printed circuit board 5 is housed in the lens barrel 20, one of the opposing surfaces of the inner wall surface of the inward flange of the lens barrel 20 corresponds to the detour projecting substrate portions 17, 18. A recess is formed. Then, as described above, the flexible printed circuit board 5
The detour projecting substrate portions 17 and 18 are fitted into the recesses when the lens is housed in the lens barrel 20.

Further, when the flexible printed circuit board 5 is housed, the flexible printed circuit boards are respectively provided on the flange surfaces inward of the positions where the contact contact portions 13 and 14 are arranged from below the flange surfaces. Two
The leading end portions of the reference numerals 5 and 24 project through.

The flexible printed boards 25, 24
Is connected to various actuators such as a diaphragm driving motor inside the lens barrel 20, and the flexible printed boards 25 and 24 are provided with the contact contact portion 13 or the contact contact portion 14 on the outer side surfaces thereof. Corresponding contact contact portions 25A and 24A are formed, respectively. Further, holes corresponding to the mounting screw holes 12 are formed at the centers of the contact points 25A and 24A. Further, on the flange surface on the outer side of the tip end portion, engaging portions each having a tapping hole are formed so as to project at a position facing the hole.

The flexible printed circuit board 5
After being stored in the lens barrel 20, the tip portions of the flexible printed circuit boards 25 and 24 are bent outward by about 90 °, and the contact contact portions 25A and 24A are connected to the contact contact portions 13 and 14, respectively. The upper surfaces are overlapped and abutted. Further, the mounting screw 27 is screwed to the engaging portion through the washer 33 from the tip end hole and the mounting screw hole 12. As a result, the contact contact portions 13, 14 and the contact contact portions 25A, 24A are electrically pressure-contact connected.

After the flexible printed circuit board 5 is housed in the lens barrel 20, the mount joint portion 19 on the lens mount side is placed on the lens barrel 20 and fixed to the outward flange portion with mounting screws 26. , The lens barrel portion. At this time, the mount contact portion penetrating from the upper surface to the lower surface of the mount joint portion 19 is joined to each contact portion of the mount contact portion 15.

FIG. 3 shows the flexible printed circuit board 5 described above.
When the lens barrel 20 is stored in the lens barrel 20.
It is the top view which looked at from above.

According to the flexible printed circuit board of the first embodiment having the above-described structure, the wiring pattern can be easily designed even when the contact contact portion for pressure contact connection is arranged on the annular portion. In addition, it is possible to achieve efficient wiring design without having to expand the width of the ring-shaped portion over the entire circumference. Further, since the contact contact portion is arranged near the mount contact portion, the wiring length from the mount portion to the contact portion is shortened, a new wiring space can be secured, and noise can be reduced. Became.

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

FIG. 4 is a development view of the flexible printed circuit board showing the second embodiment, and FIG. 5 shows a state in which the flexible printed circuit board of the second embodiment is stored in the lens barrel. It is an exploded perspective view. Further, FIG. 6 is a plan view of the flexible printed circuit board according to the second embodiment when it is housed in the lens barrel as seen from above. Note that the parts given the same reference numerals as those in the first embodiment have the same configuration and operation, and therefore the description thereof is omitted here.

The flexible printed circuit board 28 of the second embodiment differs from the flexible printed circuit board of the first embodiment in that detour projecting substrate parts 29 and 30 having bent portions are formed in a projecting manner.

Similar to the detour projecting substrate parts 17 and 18, the detour projecting substrate parts 29 and 30 are provided with a wiring pattern that detours the contact contact part 13 or the contact contact part 14, and the base end thereof. Bent portions 31 and 32 shown by two-dot chain lines in FIG. 4 are formed in each portion. These projecting substrate portions 29 and 30 are shown in the drawing with respect to the ring-shaped portion 16 at each of the bent portions 31 and 32 when the flexible printed circuit board 28 is housed in the lens barrel 35 (see FIG. 5). It is bent by approximately 180 ° toward the front side of the paper, and overlaps and contacts the upper portion of the ring-shaped portion 16.

The lens barrel 35 has substantially the same shape as the lens barrel 20 in the first embodiment, but a pair of recesses on the inner wall surface of the inward flange portion formed in the lens barrel 20 are formed. It has not been.

The rest of the configuration is the same as that of the first embodiment described above, so a description thereof is omitted here.

When the flexible printed circuit board 28 is to be housed in the lens barrel 35, first, as in the case of the first embodiment, the projecting substrate portions 6, 7 and 8 are connected to the bent portions 6A and 7 respectively.
A and 8A are bent at approximately 90 °, and the protruding substrate portion 6,
7 and 8 are fitted from the corresponding openings and housed in the space portions 21, 22 and 23. Then, the tip portions of the flexible printed circuit boards 25 and 24 are bent outward by approximately 90 °, and the contact contact portions 25A and 24A are superposed on and abut on the upper surfaces of the contact contact portions 13 and 14, respectively. Let Further, the mounting screw 27 is screwed to the engaging portion through the washer 33 from the tip end hole and the mounting screw hole 12. Thereby, the contact contact portions 13, 14
And the contact contact portions 25A, 24A are electrically pressure-contact connected.

After that, the bypass projecting substrate portion 2 is further provided.
The bent portions 9 and 30 of the bent portions 31 and 32 are approximately 180 ° with respect to the annular portion 16 toward the front side of the drawing in FIG.
It is bent and brought into contact with the upper surfaces of the tips of the flexible printed boards 25, 24.

The flexible printed board 2
After 8 is housed in the lens barrel 35, the mount joint portion 19 on the lens mount side is placed on the lens barrel 35 and fixed by the mounting screw 26 at the outward flange portion, as in the first embodiment. Then, the lens barrel is configured.

According to the flexible printed circuit board of the second embodiment having such a structure, in addition to the effect of the first embodiment, a pair of recesses on the inner wall surface of the inward flange portion formed in the lens barrel is required. Therefore, the structure is simplified.

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

FIG. 7 is a plan view of the flexible printed circuit board showing the third embodiment as seen from above when the flexible printed circuit board is housed in the lens barrel. FIG. 8 is an enlarged cross-sectional view showing the AA ′ cross section in FIG. 7. The parts given the same reference numerals as those in the first and second embodiments have the same configuration and operation, and therefore the description thereof is omitted here.

The flexible printed circuit board 28 of the third embodiment has the same structure as the flexible printed circuit board 28 of the second embodiment, but when the flexible printed circuit board 28 is housed in the lens barrel 36. The difference is that the detour projecting substrate portions 29 and 30 are bent in the opposite direction, that is, toward the lens barrel 36 side.

Further, in FIG. 8, reference numeral 34 is an engaging member to which a mounting screw 27 similar to that of the first and second embodiments is screwed. The engagement member 34 is arranged apart from the flange surface of the lens barrel 36.

The rest of the configuration is the same as that of the first and second embodiments, so the description thereof is omitted here.

According to the flexible printed circuit board of the second embodiment having such a structure, in addition to the effects of the first and second embodiments, the engaging member 34 is fixed to the flange surface of the lens barrel 36. Therefore, the mounting screw hole 12 (see FIG. 8) on the flexible printed board 28 is not damaged when the lens barrel is assembled.

In each of the above-described embodiments, notches or a large number of continuous holes (not shown) are formed in the bent portion of the flexible printed circuit board, or the cover lay is removed to facilitate bending.

In each of the above embodiments, the electric component is mounted on only one side of the flexible printed board, but the invention is not limited to this, and both sides may be mounted.

Further, in each of the above-mentioned embodiments, the mount contact portion 15 is formed so as to extend toward the outside of the ring-shaped portion 16, but the same may be done if it extends toward the inside of the ring-shaped portion 16. The effect is obtained.

In the second and third embodiments, each of the detour projecting substrate parts 17, 18, 29, 30 is formed so as to extend only toward the outside of the ring-shaped part 16. As shown in FIG. 9, the ring-shaped portion 16 may be formed to extend inward, inward, or outward.

Further, in each of the above-mentioned embodiments, the connection of the contact contact portion is realized by pressure contact, but the connection is not limited to this, and connection by solder, connection by a jumper wire, a connector or the like may be performed.

[0051]

As described above, according to the present invention, it is possible to provide a flexible printed circuit board with good wiring efficiency.

[Brief description of drawings]

FIG. 1 is a development view of a flexible printed circuit board showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a state in which the flexible printed circuit board of the first embodiment is stored in a lens barrel.

FIG. 3 is a plan view of the flexible printed circuit board of the first embodiment as seen from above when the lens barrel is housed in the lens barrel.

FIG. 4 is a development view of a flexible printed circuit board showing a second embodiment of the present invention.

FIG. 5 is an exploded perspective view showing a state in which the flexible printed circuit board of the second embodiment is stored in the lens barrel.

FIG. 6 is a plan view of the flexible printed circuit board according to the second embodiment when it is housed in the lens barrel as seen from above.

FIG. 7 is a plan view of the flexible printed circuit board according to the third embodiment of the present invention when the flexible printed circuit board is housed in the lens barrel, as seen from above.

FIG. 8 is an enlarged cross-sectional view showing the AA ′ cross section in FIG. 7 of the flexible printed circuit board of the third embodiment.

FIG. 9 is a development view showing a modified example of the flexible printed circuit boards of the second and third embodiments.

FIG. 10 is a development view showing an example of a conventional flexible printed circuit board.

[Explanation of symbols]

 5 ... Flexible printed circuit board 6, 7, 8 ... Projection board part 6A, 7A, 8A ... Bend part 9, 10, 11 ... Electrical component 13, 14 ... Contact contact part 15 ... Mount contact part 16 ... Annular part 16A ... Wiring patterns 17, 18 ... Detour projecting substrate portion 19 ... Mount joint portion 20 ... Lens barrel

[Procedure amendment]

[Submission date] May 24, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

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

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

The mount contact portion 15 is a ring-shaped portion 1.
6 extends outward from a position different from the extending position of the projecting substrate portions 6, 7, and 8, and further, the tip portion is branched and extended into two parts in a partial arc shape, and the extension is performed. In the department
There are multiple holes for inserting the mount pins.
It When the mount contact portion 15 is housed in the lens barrel, the mount contact portion 15 is curved in a U-shape at the base end portion thereof in a direction different from that of the protruding substrate portions 6, 7, and 8.
Has become.

[Procedure 3]

[Document name to be corrected] Drawing

[Correction target item name] Figure 8

[Correction method] Change

[Correction content]

[Figure 8]

Claims (1)

[Claims] 1. A flexible printed circuit board arranged in a lens barrel having a photographing optical system, wherein a flexible printed circuit board is arranged on a plane substantially perpendicular to an optical axis of the photographing optical system.
A first portion formed in an annular shape having an opening through which the light flux of the photographic optical system passes in the center, and protruding outward or inward from the first portion to mount electrical parts and inside the lens barrel. A second portion that extends in the optical axis direction and bends with respect to the first portion when housed in, and an electrical connection portion that is disposed in the first portion and electrically connected to another member, The first portion includes a third portion that projects outward or inward of a portion where the connecting portion is provided and that has a conductive pattern portion that bypasses the connecting portion. Flexible printed circuit board.