JPH09289369A - Fpc board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the wire breaking of a conductive pattern even if a cover lay part is removed in the vicinity of a bend, by forming the edge part of the cover layer part which constitutes the boundary between the nonexposed part and the exposed part of a conductive pattern, longer than the shortest length. SOLUTION: The edge 13e of a nonexposed part, which becomes the boundary between an exposed part 13d and the nonexposed part 13c, is positioned in the vicinity of the ridge X-X of a bend 13b. Moreover, the edge 13e is convex to the side of the ridge X-X, being made in circular arc which has a specified radius R. Both ends of the end 13e of this circular arc are apart by distance s in the direction of an optical axis, from the center of the end 13e nearest to the ridge X-X. In short, the end 13e which constitutes the boundary between the nonexposed part and the exposed part 13d of the conductive pattern is made longer than the case of its being made in the shape of a straight line where the end becomes shortest. Accordingly, the stress concentrating upon the end 13e is dispersed in longitudinal direction, and the wire breaking is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FPC board that electrically connects a predetermined member provided in a lens barrel that advances and retracts in the optical axis direction and a corresponding member provided in a camera body.

[0002]

2. Description of the Related Art FPC boards (flexible printed boards) are widely used for electrically connecting members that can move relative to each other. For example, in a camera, it is used to electrically connect a member provided in the camera body and a member provided in the zoom lens barrel. This type of FPC board is suitable for use in a member that requires a long moving distance because of its flexibility and conformability. Usually, a thin film member called a cover lay is laminated on the FPC board in order to protect the circuit portion where the circuit pattern is formed.

Further, there is a structure in which an FPC board is used as a so-called code plate, and a predetermined electric signal is obtained by sliding contact between a predetermined pattern (conductive pattern) formed on the code plate and a contact terminal. When the FPC board is used in such a form, the cover lay of the portion in which the contact terminals are in sliding contact is removed for conduction.
Then, as a removing method, the end portion of the coverlay portion is
It was cut in a straight line parallel to the short side of the C substrate.

On the other hand, the FPC board is usually mounted so as to have a predetermined number of bent portions according to the shape and movement distance of the device. However, if the end portion where the coverlay portion is removed in a straight line exists near the bent portion as described above, bending stress is likely to be concentrated on the boundary line of the removed portion, which causes disconnection (breakage) in the conductive pattern of this portion. The inventors have found that it is easy.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an FPC board capable of preventing disconnection of a conductive pattern even if a coverlay portion is removed in the vicinity of a bent portion, based on the above awareness of the problem.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention forms a conductive pattern on a flexible synthetic resin substrate, exposes a part of this conductive pattern, and leaves the remainder a cover made of synthetic resin. In the FPC board covered with the lay, the edge portion of the cover lay forming the boundary between the non-exposed portion and the exposed portion of the conductive pattern is formed to be longer than the shortest length.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on illustrated embodiments. In this embodiment, the present invention is applied to the lens shutter zoom lens camera shown in FIG. 21. First, the concept of this zoom lens camera will be described with reference to FIG. This camera is a three-stage extension type zoom lens barrel 1 including three extension barrels of a first movable barrel 20, a second movable barrel 19 and a third movable barrel 16.
0 is provided. The zoom lens barrel 10 has two lens groups, a front lens group L1 and a rear lens group L2.

On the camera body, the overall movement motor control means 60, the rear group movement motor control means 61, and the zoom operation means 6 are provided.
2, a shutter release means 63, a distance measuring device 64, a photometric device 65, and an AE motor control means 66 are provided.

The whole moving motor control means 60 is operated when the zoom operating means 62 such as a zoom operating lever or a zoom operating button provided on the camera body is operated.
On the other hand, a movement command for moving the zoom lens including the front lens group L1 and the rear lens group L2 from the wide side to the tele side or a movement command for moving from the tele side to the wide side is given. The focal length is changed and set to an arbitrary focal length by the operation of the zoom operating means 62 by the photographer. The image magnification of the finder field of the zoom finder 67 provided in the camera is changed in association with the change of the focal length by the zoom operation means 62. Therefore, the photographer can know the change in the focal length due to the operation of the zoom operation means 62 by observing the change in the image magnification of the viewfinder field. The focal length set by the operation of the zoom operation means 62 is, for example, an LCD display panel (not shown).
It can be recognized by the numerical value displayed on.

The overall movement motor control means 60 is also driven by the rear group movement motor control means 61 when the shutter release means 63 is operated.
At the same time, the whole movement motor 25 is driven to focus the zoom lens on the subject. The shutter release means 63 is
It is composed of a release button, and when it is pressed one step, it gives a distance measuring command to the distance measuring device 64 and a photometric command to the photometric device 65, and when it is pressed two steps, it performs a focusing operation and the AE motor control means 66. The shutter 27 of the AF / AE shutter unit 21 is operated via this. The shutter 27 receives the photometric output from the photometric device 65 and opens its shutter blade 27a for a predetermined time.

When operated, the zoom operating means 62 drives the whole moving motor 25 to move the front lens group L1 and the rear lens group L2 integrally. The rear lens group moving motor 30 may be operated via the rear lens group moving motor control means 61 at the same time as this movement, but an important point in this zoom lens camera is that the front lens group L1 and the rear lens group lens by the zoom operation means 62 are operated. It means that the movement of L2 is not performed in the conventional zooming concept in which the focal length is continuously changed without moving the focal position. That is, when the zoom operation means 62 is operated, 1. 1. A mode in which only the overall movement motor 25 is operated to move the front lens group L1 and the rear lens group L2 back and forth without changing the air gap between the two. It is possible to operate both the overall movement motor 25 and the rear group movement motor 30 to move the front group lens L1 and the rear group lens L2 while changing the air gap between them.

According to the first aspect, a subject at a specific distance cannot always be in focus, but in a lens shutter type camera such as the present camera, which does not observe an image by a photographing optical system, it is focused at the time of shutter release. If there is a match, there is no problem at all. In the second mode, the front lens group L1 and the rear lens group L2 are moved while allowing the focus position to move, and both the whole movement motor 25 and the rear group movement motor 30 are operated at the time of shutter release to focus. To match.

According to the operation of the zoom operation means 62,
When the shutter release means 63 is operated in at least a part of the focal length range of the focal length set by the zoom operating means 62 after executing either of the control modes of (2) or (2), the whole movement motor 25 and the rear group movement Motor 30
Both are operated to focus on the subject. The amount of movement of the front lens group L1 and the rear lens group L2 by the overall movement motor 25 and the rear group movement motor 30 at this time is not limited to the movement amount obtained from the subject distance information by the distance measuring device 64, and
It is determined in consideration of the movement amount obtained by the focal length information set by the zoom operation means 62. As described above, when the shutter release means 63 is operated, if the whole movement motor 25 and the rear group movement motor 30 are operated to perform the focusing operation, the degree of freedom in controlling the lens position is increased, and the control is performed. Will be easier.

Theoretically, when the zoom operating means 62 is operated, the whole moving motor 25 and the rear group moving motor 30 are operated.
When the shutter release means 63 is operated, only the field of view magnification and the focal length information of the zoom finder 67 are changed without operating any of the above. It is also possible to simultaneously operate the moving motor 25 and the rear lens group moving motor 30 to move the front lens group L1 and the rear lens group L2 to positions uniquely determined by the focal length information and the subject distance information.

Next, an embodiment in which the zoom lens barrel of the above concept is embodied will be described mainly with reference to FIGS. 2 and 20. The schematic configuration and operation of the zoom lens barrel 10 will be described first. The first moving barrel 20, the second moving barrel 19, the third moving barrel 16, and the fixed barrel block 12 are provided in order from the front. Has been. The third movable lens barrel 16 is screwed into the tubular portion 12p of the fixed lens barrel block 12, and advances and retreats in the optical axis direction as it rotates. The third movable lens barrel 16 has a linear guide cylinder 17 whose rotation is restricted, which moves integrally in the optical axis direction, inside, and the second movable lens barrel 19 rotates with respect to the linear guide cylinder 17. While moving forward and backward along the optical axis. First movable lens barrel 2
0 is restricted in rotation, and moves forward and backward in the optical axis direction by rotating with respect to the second movable lens barrel 19. The whole moving motor 25 is fixed to the fixed lens barrel block 12, and the shutter mount 40 on which the AE motor 29 and the rear group moving motor 30 are mounted is fixed to the first moving lens barrel 20. The front group lens L1 is a lens having a positive power supported by the front lens support cylinder 34, and the rear lens L2 is a lens having a negative power supported by the rear lens support cylinder 50.

The fixed lens barrel block 12 fixed to the front of the aperture plate 14 of the camera body has a cylindrical portion 12p.
On the inner peripheral surface of the female helicoid 12a, and a plurality of linear guide grooves 12 that are parallel to the optical axis O and that cross the female helicoid 12a.
b. The straight guide groove 12b ′ (see FIG. 17), which is one of the plurality of straight guide grooves 12b, has a code plate 13a (see FIGS. 2, 20, and 23) having a predetermined conductive pattern at the bottom thereof. It is fixed. An FPC board 13 is fixed to the lower surface of the front end of the fixed lens barrel block 12 (see FIG. 18), and the code plate 13a is formed by the FPC board.
It is formed on a part of a strip-shaped portion 13f extending from a part of the substrate 13. The aperture plate 14 has an aperture 14a that determines the exposure area on the film.

On the cylindrical portion 12p of the fixed lens barrel block 12, there is formed a gear accommodating portion 12c which bulges radially outward and extends in the optical axis direction (see FIG. 18). A drive pinion 15 which is long in the optical axis direction is rotatably stored in the gear storage portion 12c. Both ends of the shaft 7 of the drive pinion 15 are rotatably supported by the support hole 4 provided in the fixed lens barrel block 12 and the support hole 31a provided in the gear support plate 31, respectively. The tooth surface of the drive pinion 15 protrudes inward from the inner peripheral surface of the tubular portion 12p of the fixed lens barrel block 12.

At one side of the fixed lens barrel block 12, a supporting portion 32 for fixing the whole moving motor 25 on the rear surface and supporting a gear train 26 composed of a plurality of gears is formed on the front surface. The FPC is attached to the other side of the fixed lens barrel block 12.
An FP parallel to the optical axis O that projects the end of the substrate 6 outward
A C board escape hole 12k and a fixing portion 12m for fixing the end portion of the FPC board 6 protruding from the escape hole 12k are formed. A plurality of fixing protrusions 12n into which fixing holes 6i (FIG. 6) at the end of the FPC board 6 are fitted are planted in the fixing portion 12m. The FPC board 6 connects the AF / AE shutter unit 21 and the control unit 75 (see FIG. 1) mounted on the camera body side. This control unit 75 is C
It is provided with a PU or the like, and the whole movement motor control means 6
0, rear group movement motor control means 61, distance measuring device 64, photometric device 65, AF motor control means 66 and the like. A zoom operation means 62, a shutter release means 63, etc. are also connected to the control section 75.

A third movable lens barrel 16 is screwed onto the inner circumference of the tubular portion 12p of the fixed lens barrel block 12. This third
The movable lens barrel 16 has a plurality of straight guide grooves 16c extending in the optical axis direction on the inner peripheral surface, and a male helicoid 16a meshing with the female helicoid 12a of the tubular portion 12p on the outer periphery of the rear end portion.
It has an outer peripheral gear 16b (see FIG. 15) that meshes with the drive pinion 15. The drive pinion 15 has the outer gear 1 in the entire movement range of the third movable lens barrel 16 in the optical axis direction.
6 has an axial length that meshes with 6.

On the inner circumference of the third movable lens barrel 16, a linear guide barrel 17 is supported so as to be movable integrally with the third movable lens barrel 16 in the optical axis direction and relatively rotatable around the optical axis. . The linear guide cylinder 17 has a rear end flange portion 17d provided on the outer periphery of the rear portion with a plurality of engagement protrusions 17c protruding outward in the radial direction,
A retaining flange portion 1 having a smaller diameter than the flange portion 17d, which is provided in front of the rear end flange portion 17d with a slight gap.
7e and. A circumferential groove 17g extending in the circumferential direction around the optical axis O is formed between the retaining flange portion 17e and the rear end flange portion 17d (FIG. 16).
reference). A plurality of cutout portions 17f are formed in the circumferential direction of the retaining flange portion 17e. Third movable lens barrel 16
Has a plurality of engaging projections 16d (FIG. 2) projecting inward in the radial direction on the inner circumference of the rear end portion, and each of the engaging projections 16d is inserted from a corresponding notch portion 17f to form both flange portions 17d. ,
It is located in the circumferential groove 17g between 17e, and the linear guide tube 17
On the other hand, it is connected to the linear guide cylinder 17 by rotating a predetermined amount.

An aperture plate 23 having an opening 23a having substantially the same shape as the aperture 14a is provided on the rear end surface of the straight guide cylinder 17.
Has been fixed. The linear guide cylinder 17 has the engaging projection 1
7c is slidably engaged with the rectilinear guide groove 12b of the tubular portion 12p, and the rotation of the tubular portion 12p is restricted. On the engaging projection 17c ', which is one of the engaging projections 17c, a contact terminal 9 for slidingly contacting the code plate 13a and generating a signal corresponding to the focal length during zooming is provided. It is fixed in Fig. 19).

Next, the FPC board 13 to which the present invention is applied
Will be described in comparison with a conventional example.

The FPC board 13 is a flexible synthetic resin board on which a predetermined conductive pattern (not shown) is formed, and a part of this conductive pattern is the code plate 13.
A conductive pattern formed on a is formed. Also,
A code plate 13a is formed on the conductive pattern of the FPC board 13.
A thin film cover lay made of synthetic resin is attached to almost the entire area except on the conductive pattern.

FIG. 23 shows the structure provided on the FPC board 13.
The strip-shaped part 13f which has the code plate 13a is shown.
In FIG. 22, a shaded portion on the strip-shaped portion 13f is a portion configured as a code plate 13a having a predetermined conductive pattern (not shown), and shows an exposed portion 13d without a coverlay. . Further, in the figure, the non-hatched portion on the strip-shaped portion 13f indicates the non-exposed portion 13c having a cover lay on the conductive pattern. Code board 13
The contact terminal 9 that moves in the optical axis direction (the left-right direction in FIG. 23) along with the movement of the rectilinear guide cylinder 17 slides on a (above the exposed portion 13d). In FIG. 2, the state in which the contact terminal 9 is located at the rearmost end of its movable range is shown by a solid line, and the state in which it is located at the frontmost end is shown by a chain double-dashed line.

In the strip-shaped portion 13f, a part of the non-exposed portion 13c located in front of the code plate 13a has a straight guide groove 12.
It is folded back in a U shape by being folded back along the edge of the front end of b ′ (the front end of the tubular portion 12p). FIG.
In the middle, the line segment XX indicates the ridge line of the bent portion 13b of the strip-shaped portion 13f. Therefore, the exposed portion 1
An end portion (edge portion of Carvalley) 13e of the non-exposed portion 13c which is a boundary between the 3d and the non-exposed portion 13c has a bent portion 13b.
It is located in the vicinity of the ridge streak XX. End 13
e is convex toward the ridge stripe XX and is formed in an arc shape having a predetermined radius R. Both ends of the arc-shaped end 13e are away from the center (top) of the end 13e closest to the ridge line XX by a distance s rearward in the optical axis direction.
That is, the non-exposed portion 13c and the exposed portion 13d of the conductive pattern
The end portion 13e forming the boundary with is formed longer than when the end portion has a straight line shape (a straight line shape orthogonal to the longitudinal direction of the strip-shaped portion 13f) having the shortest length.

FIG. 22 shows a strip-shaped portion 13f 'in which the end portion of the non-exposed portion (end portion of Carvalley) is formed by a conventional method, for comparison with the strip-shaped portion 13f of this embodiment. In the figure, the same members as those of the strip-shaped portion 13f of this embodiment are designated by the same reference numerals. In this strip-shaped portion 13f ', an end portion that forms a boundary between the non-exposed portion 13c and the exposed portion 13d is located near the ridge stripe XX of the bent portion 13b, and the ridge stripe XX is formed. It is formed as a linear end portion 13e ′ extending in parallel.

In the structure of the strip-shaped portion 13f ', the bending stress generated by the bent portion 13b is weaker than that of the non-exposed portion 13c, that is, the cross-sectional area is small, and the exposed portion 1 is exposed.
Concentrate on the end 13e 'of 3d. Moreover, at the end portion 13e 'of the straight non-exposed portion 13c, the stress is uniformly concentrated along the end portion 13e' in the width direction of the strip portion 13f '(vertical direction in FIG. 22). Therefore, in particular, the end portion 13e '
Is located near the bent portion 13b, the end 1
The stress concentrated along 3e ′ is large, and therefore the conductive pattern may be broken.

On the other hand, in the strip-shaped portion 13 of the FPC board 13 to which the present invention is applied, stress concentrates on the end portion 13e of the exposed portion 13d whose strength is weaker than that of the non-exposed portion 13c. Due to the formed end 13e, the end 13e
The stress concentrated on the strip-shaped portion 13 is dispersed in the longitudinal direction of the strip-shaped portion 13.

The above-mentioned end portion 13e is not limited to the circular arc shape, and the step shapes 13s and 13 formed of concave portions or convex portions as shown in FIGS. 24 and 25, for example.
The same effect can be obtained by forming s'. That is, the bending stress generated by the bent portion 13b is
The present invention is not limited to the illustrated embodiment as long as the end of the non-exposed portion 13c is formed so as not to act uniformly in the width direction of f.

Further, as shown in FIG. 26, the bent portion 1
For example, the ridge line XX of 3b and the end of the non-exposed portion 13c are not parallel to each other, for example, a linear end part 13s ″ inclined at a predetermined angle with respect to the ridge line XX. Even if it is formed as, the same effect can be obtained.

The straight guide cylinder 17 has a plurality of straight guide grooves 17a parallel to the optical axis O on its inner peripheral surface, penetrates the peripheral wall surface, and is inclined with respect to the circumferential direction and the optical axis direction. It has a linear lead groove 17b. Multiple straight guide grooves 17a
A through hole 17i penetrating in the radial direction is formed at the rear end of one of the above, that is, the rear end of the straight guide groove 17a '(see FIG. 16). It is formed in the shape of a strip and its one end is A
A part of the FPC board 6 fixed to the F / AE shutter unit 21 passes through the through hole 17i and goes straight.
It is located in a '.

A second movable lens barrel 19 is fitted on the inner circumference of the linear guide barrel 17. The second movable lens barrel 19 has a plurality of linear lead grooves 19c on its inner peripheral surface, and a plurality of trapezoidal follower protrusions 19a having a trapezoidal cross-section protruding outward in the radial direction on the outer periphery of the rear end portion. The follower pin 18 is located on the follower protrusion 19a. The lead groove 19c is formed so as to have an inclination opposite to that of the lead groove 17b. Follower Pin 18
Comprises a ring member 18a and a center fixing screw 18b for supporting the ring member 18a on the follower protrusion 19a. The follower protrusion 19a is slidably fitted in the lead groove 17b of the linear guide cylinder 17, and the ring member 18a.
Is slidably fitted in the linear guide groove 16c of the third movable lens barrel 16. Therefore, when the third movable lens barrel 16 rotates,
While the movable lens barrel 19 rotates, it moves straight in the optical axis direction.

The first movable lens barrel 20 is fitted on the inner circumference of the second movable lens barrel 19. The first movable lens barrel 20 has a plurality of follower pins 24 provided on the outer periphery of the rear end portion engaged with the corresponding inner peripheral lead grooves 19c, and is linearly guided by a linear guide member 22.

The linear guide member 22 is formed in a substantially cylindrical shape, and as shown in FIGS. 1, 3, 12, and 13, an annular portion 22a and an annular portion 22a extending forward of the optical axis. An inner circumference of the first movable lens barrel 20 has a pair of guide legs 22b and a plurality of engaging projections 28 that project outward in the radial direction of the annular portion 22a and slidably engage with the rectilinear guide grooves 17a. The pair of guide leg portions 22b are inserted into a pair of linear guide portions 40c formed between the surface and the AF / AE shutter unit 21 so as to be linearly guided.

The annular portion 22a is coupled to the rear end portion of the second movable lens barrel 19 so as to be integrally movable in the optical axis direction and relatively rotatable about the optical axis. The linear guide member 22 has a rear end flange portion 22d provided with a plurality of engagement protrusions 28 protruding outward in the radial direction on the outer periphery of the rear portion, and the rear end flange portion 22d.
The flange portion 22d provided with a slight gap in front of the
It has a smaller diameter retaining flange 22c. Between the retaining flange portion 22c and the rear end flange portion 22d,
It is formed as a circumferential groove 22f (FIGS. 2 and 4) extending circumferentially around the optical axis O. The retaining flange 22c has a plurality of notches 22e in the circumferential direction. The second movable lens barrel 19 has a plurality of engagement protrusions 19b (FIG. 2) protruding inward in the radial direction on the inner circumference of the rear end portion, and each of the engagement protrusions 19b is cut from the corresponding notch 22e. It is inserted and positioned in the circumferential groove 22f between the flange portions 22c and 22d, and is rotated by a predetermined amount with respect to the linear guide member 22 to be coupled with the linear guide member 22. With the above configuration, when the second movable lens barrel 19 rotates in the forward and reverse directions, the first movable lens barrel 20 moves straight forward and backward with respect to the second movable lens barrel 19 while the rotation is restricted. To do.

As shown in FIGS. 4 and 5, one end of the linear guide member 22 is supported by the AF / AE shutter unit 21 on the inner peripheral side which is formed in a strip shape at the rear end of the annular portion 22a. A pressing member 70 that presses and urges the first U-shaped portion 6b of the FPC board 6 rearward of the optical axis is supported. Annular part 22
At a position close to the pressing member 70 in a, the FP
A guide groove 22i is formed to pass the first straight portion 6a of the C substrate 6 and guide straight.

The pressing member 70 includes a pair of slide guide protrusions 70c protruding forward of the optical axis and a pair of slide guide protrusions 70c.
It has a spring receiving projection 70a located in the middle of c and a spring receiving groove 70b provided at the base of the spring receiving projection 70a. Further, as shown in FIG. 18, on the back surface of the linear guide member 22, a pair of slide support holes 22h into which a pair of slide guide protrusions 70c are slidably fitted and a pair of slide support holes 22h are provided. And a spring hole 22g located in the middle thereof are formed. The spring receiving projection 70a is inserted into the spring hole 22g, and the compression spring 71 having one end supported by the spring receiving groove 70b is contracted. The pressing member 70 has the guide groove 22i and its shape when viewed in the optical axis direction from the rear side in a state where the slide guide protrusion 70c is fitted in the slide support hole 22h and the spring receiving protrusion 70a is inserted in the spring hole 22g. Has a guide groove 70d that substantially coincides with. With these configurations, the pressing member 70 is positioned at the rear end of the linear guide member 22 (that is, the rear end of the first movable lens barrel 20) so as to be movable back and forth in the direction parallel to the optical axis O.

A barrier device 35 having barriers 48a and 48b is mounted on the front end of the first movable lens barrel 20, and three shutter blades 27a (FIG. 14) are provided on the inner peripheral surface.
An AF / AE shutter unit 21 having a shutter 27 composed of The AF / AE shutter unit 21 has a plurality of fixing holes 40a (FIG. 10) formed at equal angular intervals on the outer peripheral portion of the shutter mount 40. The plurality of follower pins 24 are connected to the AF / A
Also serves as a fixing means for the E shutter unit 21, and
The pin hole 20a formed in the movable lens barrel 20 and the fixing hole 4
The follower pin 24 is fitted and fixed to 0a, and the shutter unit 21 is fixed to the first movable lens barrel 20 (see FIG. 11). The follower pin 24 is, for example, glued,
It can be fixed by means such as screwing. Reference numeral 41 is a decorative plate fixed to the front end of the first movable lens barrel 20.

The AF / AE shutter unit 21 is shown in FIG.
4, and a shutter mount 40, as shown in FIG.
The shutter mount 40 includes a shutter blade support ring 46 fixed to the rear part of the shutter mount 40, and a rear group lens support cylinder 50 movably supported with respect to the shutter mount 40. The shutter mount 40 includes a front lens group support cylinder 3
4, the AE motor 29, and the rear group movement motor 30 are supported. This shutter mount 40 is used for the front lens group support cylinder 3
4 with an imaging opening 40d that engages with the rear end of
0f and three leg portions 40b extending rearward from the annular portion 40f. These three legs 40
Two of the gaps between b are configured as the pair of linear guide portions 40c that guide the pair of guide leg portions 22b of the linear guide member 22 slidably and move.

The shutter mount 40 further has an AE gear train 45 for transmitting the rotation of the AE motor 29 to the shutter 27.
And the rotation of the rear group movement motor 30 to the screw shaft 4
3, a lens drive gear train 42, a photo interrupter 56, 57 connected to the FPC board 6, and a rotating plate 58, 59 having a large number of slits in the circumferential direction are supported. The photo interrupter 57 and the rotary plate 59 constitute an encoder for the rear group moving motor that detects the rotation of the rear group moving motor 30, and the photo interrupter 56.
The rotary plate 58 constitutes an AE motor encoder that detects the rotation of the AE motor 29. The rear lens group L based on the detection result of the rear group movement motor encoder
The position in the optical axis direction with respect to the second front lens group L1 is detected,
The aperture diameter of the aperture of the shutter 27 is detected based on the detection result of the encoder for the AE motor.

The shutter 2 is provided between the shutter mount 40 and the shutter blade support ring 46 fixed to the mount 40.
7, a support member 47 that pivotally supports the three shutter blades 27a of the shutter 27, and an annular drive member 49 that applies rotational force to the shutter blades 27a. The annular drive member 49 is provided with three operation protrusions 49a that engage with the three shutter blades 27a at equal angular intervals. The shutter blade support ring 46 is provided on the front wall portion with the photographing opening 4
6a and three support holes 46b provided at equal angular intervals around the photographing opening 46a, and the straight guide portion 4 is provided on the outer peripheral portion.
It has a bending restriction surface 46c exposed from 0c and slidably supporting the inner peripheral surfaces of the pair of guide leg portions 22b.

The support member 47 located in front of the shutter blade support ring 46 includes a photographing opening 47a facing the photographing opening 46a, and three shaft portions 47b facing the three supporting holes 46b (see FIG. 14). Only shown). Each of the three shutter blades 27a has, at one end, a shaft hole 27b through which the shaft portion 47b is inserted, and at the other end, a shielding portion that shields the photographing openings 46a and 47a.
Between the one end and the other end, there is an elongated hole 27c through which the operation protrusion 49a is inserted. The support member 47 includes shafts 47b that respectively support the shutter blades 27a.
The shutter blade support ring 46 is fixed to the corresponding shutter hole support ring 46 in a state of being fitted into the corresponding support hole 46b.

The annular drive member 49 has a gear train 4 on its outer peripheral portion.
It has a gear portion 49b that receives rotation from 5. Further, the support member 47 has three circular arc grooves 47c along the circumferential direction at positions close to the three shaft portions 47b. The three operation protrusions 49a of the annular drive member 49 penetrate the three arcuate grooves 47c to form the elongated holes 27 of each shutter blade 27a.
c is engaged. The shutter blade support ring 46 is inserted from the rear side of the shutter mount 40 while supporting the annular driving member 49, the support member 47, and the shutter 27, and is screwed to the shutter mount 40.

Behind the shutter blade support ring 46, a rear lens group support cylinder 50 movably supported by the shutter mount 40 via slide shafts 51 and 52 is arranged. The rear end portions of the slide shafts 51 and 52 are respectively fitted to shaft support bosses 50b and 50c that are provided on the outer peripheral surface of the rear lens group support cylinder 50 so as to project therefrom. The shutter mount 40 and the rear lens group support cylinder 50 are urged to move away from each other by the coil spring 3 fitted to the slide shaft 51, thereby eliminating play between them. The drive gear 42a provided in the gear train 42 is restricted from moving in the axial direction, and a female screw is formed on the inner periphery thereof. A screw shaft 43 having one end fixed to the rear lens support cylinder 50 is screwed to the female screw, and the drive gear 42a and the screw shaft 43 constitute a feed screw mechanism. The rear end portion of the screw shaft 43 is fitted to a shaft support boss 50a protruding from the outer peripheral surface of the rear lens group support cylinder 50. Therefore, when the rear group moving motor 30 is rotationally driven to rotate the drive gear 42a in either forward or reverse directions, the screw shaft 43 advances or retracts with respect to the drive gear 42a, and the rear group lens support cylinder 50, that is, the rear group lens support. The rear lens group L2 supported by the barrel 50 moves with respect to the front lens group L1.

Pressing members 53 and 55 for pressing the motors 29 and 30 supported by the shutter mount 40 are screwed to the front of the shutter mount 40. The FPC board 6 whose one end is fixed to the shutter mount 40 includes motors 29 and 30, and a photo interrupter 56.
57 is connected. First to third movable lens barrels 20 and 1
In a state where 9 and 16 and the AF / AE shutter unit 21 and the like are assembled, an aperture plate 23 is fixed to a rear end surface of the linear guide cylinder 17, and an annular plate is formed at a front end portion of the cylindrical portion 12p of the fixed lens barrel block 12. The retaining member 33 is fitted.

In the present zoom lens barrel 10 having the above structure, the FPC board 6 is arranged as shown in FIGS. To explain each part in this arrangement state by giving a name, the FPC board 6 includes the AF / AE shutter unit 21 mounted on the first movable lens barrel 20 to the second movable lens barrel 19.
First linear portion 6a along the inner surface of the guide groove 22i
And the linear guide member 2 at the rear end of the second movable lens barrel 19.
The first U-shaped portion 6b bent forward through the second guide groove 22i, and the third movable lens barrel 1 from the first U-shaped portion 6b.
6 has a second straight portion 6c directed to the inner surface of the front end portion, and a second U-shaped portion 6d bent backward at the front end portion of the second straight portion 6c. The FPC board 6 is also the second U
A third straight portion 6e extending from the character portion 6d to the camera body side along the inner surface of the third movable lens barrel 16, and a straight guide groove 17
The FPC of the fixed lens barrel block 12 is guided from the outer surface 17h side of a'through the through hole 17i to the inner surface of the linear guide tube 17.
A third U-shaped portion 6f directed to the control portion 75 through the board escape hole 12k, and a fourth straight portion 6 following the third U-shaped portion 6f.
g and the fixed portion 12 on the outer side of the fixed lens barrel block 12.
and a fixed end portion 6h (FIGS. 6 to 11) fixed to m. Further, since the FPC board 6 needs to be fixed to the straight-travel guide tube 17, the FPC board 6 passes through the straight-travel guide groove 17a ′ and is bent at the front end of the straight-travel guide tube 17 and then once exposed to the outside to form the second U-shape. After the third linear portion 6e following the linear portion 6d is fixed to the outer surface 17h with the double-sided tape 73 (FIG. 3), it is again inserted into the straight guide tube 17 from the outer surface 17h side through the through hole 17i as described above. Then, the third movable lens barrel 16
Of the fixed lens barrel block 12 through the FPC board escape hole 12k.

In this embodiment, the rear lens group L2 is set to the AF
/ AE shutter unit 21 as one of the constituent members, and the unit 21 includes an AE motor 29 and a rear group movement motor 30.
It is equipped with. According to this configuration, there is an advantage that the supporting structure and the driving structure of the front lens group L1 and the rear lens group L2 can be simplified. Shutter 2
The present zoom lens can be realized even when the AF / AE shutter unit 21 including the shutter blade pressing ring 46 and the like 7 is provided as a separate member and is supported by a support member different from the unit.

The present zoom lens camera operates as follows. When the power switch (not shown) is turned on in the lens housed state of FIG. 2 in which the zoom lens barrel 10 is most retracted, the whole movement motor 25 is driven to rotate a little in the forward direction. Then, this rotation is transmitted to the drive pinion 15 via the gear train 26 supported by the support portion 32, and the third
Since the movable lens barrel 16 is rotated in the extending direction, the second movable lens barrel 19 and the first movable lens barrel 20 are slightly extended in the optical axis direction together with the third movable lens barrel 16, and the camera sets the zoom lens wide. The camera is ready to shoot at the edge.

When the zoom operation means 62 is operated to the tele side in this photographing possible state, the whole movement motor 25 is rotationally driven in the positive direction through the whole movement motor control means 60, and the driving pinion 15 and the outer peripheral gear 16b are used. The third movable lens barrel 16 is rotated in the feeding direction. Therefore,
The third moving lens barrel 16 is extended from the cylindrical portion 12p of the fixed lens barrel block 12 due to the relationship between the female helicoid 12a and the male helicoid 16a, and at the same time, the linear guide tube 17 is provided with the engaging projection 17c and the linear guide groove 12b. Due to the relationship, the third movable lens barrel 16 and the third movable lens barrel 16 advance to the front side of the optical axis without rotating with respect to the fixed lens barrel block 12. At this time, the contact terminal 9 fixed to the linear guide cylinder 17 slides on the code plate 13a to generate a signal corresponding to the focal length during zooming. At this time, one end of the code plate 13a is attached to the FPC board 1
The non-linear end portion 13e of the coverlay can prevent disconnection of the conduction pattern due to stress concentration of bending stress even if it is located in the vicinity of the bent portion 13b of No. 3, so that a stable contact state between the contact terminal 9 and the code plate 13a. Can be achieved over the entire area of the code plate 13a. Further, the second movable lens barrel 19
Attaches the follower pin 18 to the lead groove 17b and the straight guide groove 1
By engaging with 6c at the same time, while moving in the same direction as the third movable lens barrel 16, it moves forward of the optical axis with respect to the movable lens barrel 16. Further, since the first movable lens barrel 20 is guided straight by the linear guide member 22 and the follower pin 24 is moved and guided by the lead groove 19c, the second movable lens barrel 19 does not rotate with respect to the fixed lens barrel block 12. To advance to the front of the optical axis together with the AF / AE shutter unit 21.

Since the rear lens group moving motor 30 is not driven while the zoom lens barrel 10 is driven in this way, the front lens group L1 and the rear lens group L2 are integrally integrated with each other while keeping a constant distance from each other. Move in the direction (see FIG. 1). The focal length set by the zoom operation means 62 is displayed by the display means (not shown).

When the release button is pushed one step (half depressed) at an arbitrary focal length set by the zoom operating means 62, a distance measuring command is given to the distance measuring device 64 and a light measuring command is given to the light measuring device 65. , Photometry and distance measurement are started. After that, when the release button is pressed twice (fully pressed), both the total movement motor 25 and the rear group movement motor 30 are moved by the zoom operation means 62 and the movement amount obtained by the object distance information from the distance measuring device 64. The front lens group L1 and the rear lens group L2 are moved by a movement amount determined in consideration of the movement amount obtained by the set focal length information to set the focal length and focus on the subject,
Through the AE motor control means 66, the AE motor 29 rotationally drives the annular drive member 49 according to the subject brightness information from the photometric device 65, and drives the shutter 27 so as to satisfy a predetermined exposure. After completion of the shutter release, both the whole movement motor 25 and the rear group movement motor 30 are immediately driven to return the front group lens L1 and the rear group lens L2 to the state before the shutter release.

When the zoom operating means 62 is operated to the wide side, the whole moving motor 25 is rotationally driven in the reverse direction, and
The movable lens barrel 16 is rotated in the retracting direction and retracted into the fixed lens barrel block 12 together with the linear guide barrel 17. At the same time, the second movable lens barrel 19 is retracted with respect to the movable movable lens barrel 16 while rotating in the same direction as the third movable lens barrel 16.
The movable lens barrel 20 has a position A relative to the rotating second movable lens barrel 19.
It is pulled in together with the F / AE shutter unit 21.
Also during this retraction drive, the rear group moving motor 30 is not driven, as in the above-described retraction drive. Then, when the power switch is turned off, the zoom lens barrel 10 is retracted to the lens storage position shown in FIG. 2 by the overall movement motor 25 that is rotationally driven based on the power switch.

[0053]

As described above, according to the present invention, a conductive pattern is formed on a flexible synthetic resin substrate, a part of the conductive pattern is exposed, and the remainder is made of synthetic resin. In the FPC board covered with, since the edge portion of the coverlay that forms the boundary between the non-exposed portion and the exposed portion of the conductive pattern is formed longer than the shortest length, the stress acting on the edge portion is dispersed and the conductive pattern is disconnected. Can be prevented.
As a result, a stable contact state between the conductive pattern and the contact terminal can be maintained over the entire conductive pattern.

[Brief description of drawings]

FIG. 1 is an upper half sectional view showing a main part of a zoom lens barrel to which the present invention has been applied, in a maximum extended state.

FIG. 2 is an upper half sectional view showing a lens housed state of the zoom lens barrel.

FIG. 3 is an exploded perspective view showing a main part of the zoom lens barrel.

FIG. 4 is an enlarged perspective view showing the linear guide member of the zoom lens barrel alone.

FIG. 5 is a side sectional view showing the periphery of a pressing member of the zoom lens barrel.

FIG. 6 is a perspective external view showing a state in which, in the zoom lens barrel, an FPC board from an AF / AE shutter unit projects to the outside of the first movable lens barrel.

FIG. 7 is a perspective external view showing a state in which an FPC board from an AF / AE shutter unit projects to the outside of a second movable lens barrel in the zoom lens barrel.

FIG. 8 is a perspective external view showing a state in which an FPC board from an AF / AE shutter unit projects to the outside of a linear guide cylinder in the zoom lens barrel.

FIG. 9 is a perspective external view showing a state in which an FPC board from an AF / AE shutter unit projects to the outside of a third moving lens barrel in the zoom lens barrel.

FIG. 10 is an exploded perspective view showing a main part of the zoom lens barrel.

FIG. 11 is a perspective view showing a state where the AF / AE shutter unit of the zoom lens barrel is assembled to a first movable barrel.

FIG. 12 is a perspective view showing a main part of a mechanism for linearly guiding an AF / AE shutter unit of the zoom lens barrel.

13 is a perspective view showing a main part of a mechanism for linearly guiding the AF / AE shutter unit of the zoom lens barrel in a state different from that in FIG.

FIG. 14 is an exploded perspective view showing main members of an AF / AE shutter unit of the zoom lens barrel.

FIG. 15 is a perspective external view showing a third movable lens barrel of the zoom lens barrel.

FIG. 16 is a perspective external view showing a linear guide tube of the zoom lens barrel.

FIG. 17 is a perspective external view showing a fixed lens barrel block of the zoom lens barrel.

FIG. 18 is a front view showing a fixed barrel block of the zoom lens barrel.

FIG. 19 is a rear view showing a fixed lens barrel block of the zoom lens barrel.

FIG. 20 is an exploded perspective view showing the entire zoom lens barrel.

FIG. 21 is a block diagram showing a control system for controlling the operation of the zoom lens barrel.

FIG. 22 is a plan view of an FPC board with a coverlay end portion cut off according to a conventional example.

FIG. 23 is a plan view of an FPC board with a coverlay end portion cut off by applying the present invention.

FIG. 24 is a plan view of an FPC board showing an application example of the present invention.

FIG. 25 is a plan view of an FPC board showing an application example of the present invention.

FIG. 26 is a plan view of an FPC board showing an application example of the present invention.

[Explanation of symbols]

 9 Contact terminal 12 Fixed lens barrel block 13 Flexible printed board 13a Code plate 13b FPC board bent portion 13c FPC board non-exposed portion 13d FPC board exposed portion 13e FPC board non-exposed portion (coverlay) end portion X -X Ridge on the ridge

Claims (6)

[Claims] 1. An FPC board in which a conductive pattern is formed on a flexible synthetic resin substrate, a part of the conductive pattern is exposed, and the rest is covered with a synthetic resin cover lay. An FPC board characterized in that an edge portion of the carvalley forming a boundary between the exposed portion and the exposed portion is formed longer than the shortest length. 2. The FPC board according to claim 1, wherein
The FPC board is an FPC board that is bent in the vicinity of the edge of the carvalley. 3. The FPC board according to claim 1 or 2, wherein an edge portion of the carvalley has an arc shape. 4. The FPC board according to claim 1, wherein the edge portion of the carvalley has a step shape. 5. The FPC board according to claim 1 or 2, wherein an edge portion of the carvalley has a linear shape that is inclined at a predetermined angle with respect to a ridge line of the FPC board to be bent. 6. An FPC board in which a conductive pattern is formed on a flexible synthetic resin substrate, a part of the conductive pattern is exposed, and the remaining portion is covered with a synthetic resin carburet. In an FPC board having a bent portion in the vicinity thereof, an edge portion of a carvalley forming a boundary between a non-exposed portion and an exposed portion of a conductive pattern and a ridge line of the bent portion are not parallel to each other. .