JP2007165412A - Electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic device capable of preventing, in a simple structure, a flexible printed board incorporated in the device from accidentally moving out of a predetermined range. <P>SOLUTION: Edges 30b and 30c of the strip flexible printed board 30 are held and fixed to keep a cross section perpendicular to its longitudinal direction arcuate, so as to keep linearity of a linear part 30e from both edges to a curve 30d. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electronic device in which a flexible printed circuit board is deformed and provided in the electronic device.

  In an electronic apparatus such as a photographic lens barrel formed of a plurality of lens frames, there are a lens frame and a rotating frame that move relative to a fixed first member such as a fixed frame. Among them, devices such as a shutter, a diaphragm, and a focusing lens are provided, and an electric device such as a motor is incorporated in the movable second member in order to drive these devices. And in order to maintain the electrical connection between the electric device provided in the first member and the electric device of the second member, a strip-shaped flexible printed circuit board (between the first and second members) Flexible printed wiring board) is arranged.

  The belt-like flexible printed circuit board is bent and folded into a U shape at substantially the center in the longitudinal direction. One end of the belt-like flexible printed circuit board is placed on the electronic device on the second member (for example, first group lens frame) side, and the other end is placed on the second side. By connecting to an electronic circuit on the side of one member (for example, a fixed frame), the second member is allowed to move in the optical axis direction while maintaining electrical connection.

  However, the bent portion of the flexible printed circuit board moves with the movement of the second member in the optical axis direction, and the length of the straight line portion between the end portion (connection end) of the flexible printed circuit board and the bent portion varies. , The linearity of the straight portion is impaired by its own weight, and tends to be deformed and bent downward. And if a flexible printed circuit board deform | transforms with dead weight and bends below, there exists a possibility that it may move carelessly outside a predetermined range. For example, the flexible printed circuit board may approach the vicinity of the photographic light beam and generate unnecessary reflected light, or may enter the photographic light beam and block the photographic light beam, thereby adversely affecting the image on the image sensor or film.

Therefore, a guide member with an arm portion is provided in the vicinity of the U-shaped bent portion of the flexible printed circuit board, and the flexible printed circuit board is bent around the arm portion of the guide member and incorporated into the U-shaped configuration. The structure which prevents the bending (deformation) to an arm with an arm part is proposed (for example, Unexamined-Japanese-Patent No. 7-020370).
JP-A-7-020370

  However, in the above-described Patent Document 1, an extra mechanism is used to suppress unnecessary displacement of the flexible printed circuit board.

  An object of the present invention is to provide an electronic device that has a simple structure and can prevent a flexible printed circuit board built in the electronic device from inadvertently moving outside a predetermined range.

  According to the first aspect of the present invention, the first member; the second member that moves relative to the first member; the bending member, and the movement of the bending portion is accompanied by the movement of the bending member. A strip-shaped flexible printed circuit board that allows the relative movement between the first member and the second member to electrically communicate between the first member and the second member; A cross section perpendicular to the direction is held in an arc shape on one of the strip-shaped end portions, and arc holding means for maintaining the linearity of the straight portion formed from the end portion to the bent portion is provided. .

  According to the second aspect of the present invention, a first member; a first electric device provided on the first member; a second member that moves relative to the first member; A second electric device provided on the second member; and having a bent portion, allowing the relative movement between the first member and the second member with movement of the bent portion. A belt-like flexible printed circuit board electrically communicating between the first and second electric devices; a section perpendicular to the longitudinal direction of the flexible printed circuit board being held in an arc shape, and a portion other than the bent portion And an arc holding means for preventing the bending.

  According to a third aspect of the present invention, the arc holding means holds and fixes the strip-like end portion of the flexible printed circuit board in an arc shape.

  According to the fourth aspect of the present invention, the arc holding means includes a holding member that holds one of the belt-like end portions of the flexible printed circuit board in an arc shape with the first member; It is characterized by having at least one of an arc-shaped holding hole that is formed and holds the other of the belt-like end portions of the flexible printed circuit board in an arc shape.

  According to the present invention described in claim 5, the electronic device is a photographic lens barrel.

  According to the sixth aspect of the present invention, the first member; the second member that moves relative to the first member; and a bent portion that is accompanied by the movement of the bent portion. 1 is formed in a band shape to allow the relative movement between the first member and the second member to electrically communicate between the first member and the second member, and at least the band-shaped end A section perpendicular to the longitudinal direction of the belt-like one is held in an arc shape, and a flexible printed circuit board that maintains the linearity of the straight portion formed from the end portion to the bent portion. Yes.

  According to the seventh aspect of the present invention, there is provided a flexible printed circuit board comprising: a first member; a second member; and a communication portion that electrically communicates between the first member and the second member. And holding means for deforming at least one end of the connecting portion of the flexible printed circuit board in a shape of a cross section perpendicular to the longitudinal direction of the connecting portion and holding the one end while maintaining the deformation. It is characterized by having.

  ADVANTAGE OF THE INVENTION According to this invention, the electronic device which can prevent that the flexible printed circuit board built in the electronic device inadvertently moves out of the predetermined range with a simple structure can be provided.

  In the present invention, the cross section perpendicular to the longitudinal direction of the belt-like flexible printed circuit board (flexible printed wiring board) is held in an arc shape at least one of the belt-like end portions, and the linearity of the straight portion from the end portion to the bent portion Is held to suppress bending of the flexible printed circuit board.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view taken along the optical axis of a taking lens barrel housed in a digital camera which is an electronic apparatus according to an embodiment of the present invention. FIG. 1 (A) is a longitudinal sectional view at a tele position. 2B is a longitudinal sectional view at a wide position, FIG. 2 is a cutaway view of a portion X in FIG. 1, FIG. 3 is a partial sectional view of the electronic device as viewed from the sectional direction of line AA in FIG. FIG. 2 is an exploded perspective view of components of the photographing lens barrel shown in FIG.

  As shown in FIG. 1, a camera lens barrel 20 is housed in the camera body 10, and an imaging element 10 a that is a CCD that captures a photographing light beam obtained by a series of lens groups in the camera lens barrel is provided in the camera body. It arrange | positions through the electric board | substrate 10c on the supporting member 10b. A strip-shaped flexible printed circuit board (flexible printed circuit board) 30 is disposed so as to electrically connect the electric device in the photographic lens barrel 20.

  The configuration of the photographic lens barrel 20 will be described. As shown in FIGS. 1 and 4, the photographic lens barrel includes a fixed frame 21 corresponding to a first member fixed to a support member 10b in the camera book, A rotating frame 22 housed in the fixed frame so as to be rotatable with respect to the fixed frame and movable in the optical axis O direction (movable straight), and a second frame housed in the rotating frame so as to be able to go straight in the optical axis direction and to be unrotatable. The first group moving frame 23 and the second group lens frame 24 are provided, and the first group lens frame 231 is accommodated in the first group moving frame.

  The fixed frame 21 has a cylindrical body having an outer flange 21a at an end on the image sensor side (hereinafter referred to as “rear end”) and an inner flange 21b at an end on the subject side (hereinafter referred to as “front end”). And is fixed to a support member 10b in the camera body via an outer flange. A female helicoid screw 21 c is formed on the inner surface of the fixed frame 21. An elongated drive gear hole 21 d parallel to the optical axis O and a rectilinear groove 21 e are also formed on the inner surface of the fixed frame 21. Bearings 21f for receiving a driving gear, which will be described later, are provided at both ends of the driving gear hole 21d in the optical axis direction. Further, a rectangular through hole 21 g and two long holes 21 h extending in parallel to the optical axis O are formed through the wall surface of the fixed frame 21.

  A zoom drive motor (zoom motor) 211 is provided adjacent to the fixed frame 21 and outside the fixed frame. The drive gear 212 is rotatably supported by the bearing 21f in the drive gear hole 21d on the inner surface of the fixed frame.

  A pressing member 213 is provided inside the fixed frame 21. FIG. 5 shows the pressing member 213, (A) is a front view, (B) is a plan view, and (C) is a right side view. As shown in FIGS. 4 and 5, the pressing member 213 is formed in an arc shape corresponding to the curve of the inner surface of the fixed frame 21, for example, from an elastic metal plate, and is substantially upright at the left and right ends when viewed from the subject side. The bent piece 213a is integrally formed, and the upper end of the bent piece is a locking piece 213a1 bent outward. The two bent pieces 213a are formed in a shape that can be inserted into the long hole 21h on the wall surface of the fixed frame. Here, the holding member 213 is formed in a shape that holds and fixes an arc shape corresponding to the curve of the inner surface of the fixed frame by sandwiching one end of the flexible printed circuit board 30 between the inner surface of the fixed frame 21. . In addition, a part 213b of the pressing portion is cut out at a portion corresponding to the lower portion of the through hole 21g of the fixed frame.

FIG. 6 shows a rear view of the taking lens barrel viewed from the direction of arrow B in FIG. As shown in FIGS. 1, 4 and 6, the rotary frame 22 is a cylindrical body having a spur gear 22a at a predetermined angle in the circumferential direction at the rear end and an inner flange 22b at the front end. A male helicoid screw 22c is overlapped with 22a. Here, the spur gear 22a is not provided on the entire circumference of the rotary frame 22, but is provided in a range of 270 degrees, for example. Then, the helicoid screw 22c is engaged with the corresponding helicoid screw 21c of the fixed frame 21, and the spur gear 22a is engaged with the drive gear 212, so that the rotary frame 22 can rotate within the fixed frame 21 and move in the optical axis direction. It is stored in.
Further, spiral inner and second cam grooves 22d1, 22d2 are arranged in parallel with each other on the inner surface of the rotating frame 22, and these cam grooves are a common introduction formed on the rear end surface of the rotating frame. It branches in the middle of the groove 22d3 (see FIG. 6) and extends in parallel with each other.

A first group moving frame 23 and a second group lens frame 24 are housed in the rotary frame 22, and the first group moving frame is a cylindrical body having an inner flange 23 a at the front end portion, and the first group moving frame is disposed inside the first group moving frame 23. The lens frame 231 is fixed and held. The first group lens frame 231 includes a first group lens holding frame 231d that holds the first group lens 231a. The first group lens holding frame 231d is supported so as to be movable relative to the first group lens frame 231 in the optical axis direction for focusing. On the other hand, the second group lens frame 24 holds the second group lens 24a therein.
A rectilinear key groove 231 b parallel to the optical axis O is formed in the lower part of the first group lens frame 231. Further, a rectilinear key groove 24 b parallel to the optical axis O is formed below the second group lens frame 24.

A focus drive motor (focus motor) 231c is provided on the rear end face of the first group lens frame 231. The upper part of the second group lens frame 24 is cut out so as to secure a space for arranging the focus motor 231c.
Three cam followers 23b are formed on the outer peripheral surface of the outer peripheral surface of the first group moving frame 23 so as to be separated from each other at intervals of 120 degrees in the circumferential direction. In addition, three cam followers 24c are also formed on the outer peripheral surface of the second group lens frame 24 so as to be separated from each other at intervals of 120 degrees in the circumferential direction.

As described above, the rotating frame 22 is housed in the fixed frame 21, and the first group moving frame 23 and the second group lens frame 24 are housed and arranged in the rotating frame from the end (rear end) on the image sensor side, respectively. Then, the rectilinear ring 25 is attached to the rear end portion of the rotary frame 22.
FIG. 7 shows the rectilinear ring 25, (A) is a plan view, and (B) and (C) are cross-sectional views taken along lines BB and CC in (A). As shown in FIG. 7 in addition to FIG. 4, the rectilinear ring 25 further includes a rectilinear key 25a that extends to the subject side in parallel with the optical axis O and a tip of a short plate portion that extends to the image sensor side. A rotation stop 25b extending outward in the radial direction is provided, and a notch 25c inclined with respect to the radial line (radiation) R is formed in a part of the rotation stop 25b. The rectilinear key 25a of the rectilinear ring is engaged with the rectilinear key grooves 24b and 231b of the second group lens frame and the first group lens frame.

  In a known photographic lens barrel, the rectilinear ring with a rectilinear key moves in the optical axis direction together with the rotating frame and has an attachment member at the end of the rotating frame on the image sensor side so as to rotate relative to the rotating frame. For example, in Japanese Patent Application Laid-Open No. 5-188273, it is attached using a screw and a receiving member. However, in the known configuration, a mounting member is required, the man-hours for assembling the straight ring are complicated, and the assembling cannot be performed easily.

On the other hand, as described above, in the embodiment, the notch 25c is provided in the rectilinear ring 25. Therefore, the rectilinear ring 25 can be deformed in a plane perpendicular to the optical axis O like the E ring and the C ring, and the envelope circle enveloping the ring outer diameter of the rectilinear ring is elastically deformed during the elastic deformation. It becomes smaller than the envelope circle in the previous natural state, that is, the outer diameter of the ring. A mounting groove 22e (see FIGS. 1 and 6) as an inner circumferential groove is formed on the inner surface of the end of the rotating frame 22 on the image sensor side, and the linearly moving ring 25 is engaged with the mounting groove 22e under the elastic deformation. Combined. After this engagement, the elastic deformation is released, the ring outer diameter of the rectilinear ring 25 becomes the original free state, and can rotate relative to the rotary frame 22 in the mounting groove 22e.
Since the rectilinear ring 25 can be engaged with the mounting groove 22e of the rotating frame by utilizing its elastic deformation, it can be easily assembled (attached) to the rotating frame 22 without requiring an attaching member. Further, since it is sufficient to provide one each of the straight advance key 25a, the rotation stopper 25b, and the notch 25c, the straight advance ring 25 having a simple configuration is obtained, and the configuration of the photographing lens barrel 20 is not complicated.
The rectilinear ring 25 is configured such that after the first group moving frame 23 and the second lens frame 24 in which the first group lens frame 231 is incorporated are incorporated in the rotating frame 22, the lens frames 231 and 24 from the rotating frame are arranged. Prevents falling off.

Here, the notch 25c of the rectilinear ring may be formed in parallel with the radial line R. However, as described below, it is preferable that the notch is an oblique notch that inclines and intersects with the radial line R.
8A and 8B are plan views of the rectilinear ring, where FIG. 8A is a notched rectilinear ring formed in parallel with the radial line R, and FIGS. 8B and 8C are crossed with the radial line R inclined. Each of the (straight) notched straight rings is shown. Assuming that the width (gap) of the notch 25c is d and that the cross section XX in FIG. 8A is a fixed end, the two end portions 25c1 facing the parallel notch can be displaced by d / 2. Become.
On the other hand, if the width of the diagonal notch 25c in FIG. 8B is the same value (= d), the circumferential width d ₁ is d ₁ = d / cos θ, and 0 <θ <. in 90, from d ₁ is greater than d, assuming a fixed end sectional X-X, displaceable length of the two ends 25c1 (= d _1/2) is greater than d / 2. In other words, if the notch 25c is formed obliquely, if the notch width is the same, a larger displacement than in the case of the parallel notch is obtained, and the rectilinear ring 25 is elastically deformed under a large displacement. In addition, it is possible to easily incorporate the rectilinear ring into the rotary frame 22.

Further, as shown in FIG. 8C, the width d _{2 of the} notch 25c at which the displaceable length of the end portion 25c1 is d / ₂ is d ₂ = d cos θ, and when 0 <θ <90, d ₂ Is smaller than d, and if the notch 25c is formed obliquely, the same displacement (= d / 2) as that of the parallel notch can be obtained with a small notch width (d ₂ ). That is, the width of the notch 25c necessary to obtain the same displacement of the end portion 25c1 is smaller if it is formed obliquely than when the notch is parallel. If the width of the notch 25c is small, the displacement with respect to the external force after incorporation is small, and therefore the displacement of the rectilinear ring 25 is small even with respect to the rotation of the rotary frame 22, and a stable movement is ensured.

  As described above, if the notch 25c of the rectilinear ring is formed obliquely, the rectilinear ring can be easily incorporated into the rotary frame 22. Further, if the above-described embodiment different from this is adopted, the straight ring 25 is hardly deformed even after being assembled, and a stable movement is ensured.

  9A1 is a perspective view of the flexible printed circuit board held in an arc shape according to the present invention, and FIG. 9A2 is a view from the direction of arrow A in FIG. 9A1. As shown in FIGS. 4 and 9 (A1) and (A2), the band-shaped flexible printed circuit board 30 has a connection piece 30a connected to an electric substrate (electric device) 31 on the fixed frame side at one end thereof. The belt is formed in a shape that is bent and folded at substantially the center in the longitudinal direction. On the other hand, FIG. 9 (C1) is a perspective view of a flexible printed circuit board arranged by a conventional method, and FIG. 9 (C2) is an arrow view from the arrow C direction of (C1).

That is, as shown in FIGS. 1 and 3, an arc-shaped holding hole 231e is formed in the end face of the rear end portion of the first group lens frame 231, and one end portion 30b of the flexible printed circuit board is formed in the holding hole. Is held and fixed, and is electrically connected to the focus motor (second electric device on the second member side) 231c.
The other end 30c is clamped between the presser member and the fixed frame by mounting the presser member 213 in the fixed frame, and is pressed and held and fixed to the inner surface of the fixed frame. In other words, the pressing member 213 is placed inside the fixed frame 21, and the bent piece 213a is inserted into the long hole 21h of the fixed frame wall surface while being elastically deformed by applying a pressing force in a direction approaching each other, and then the pressing force is applied. Except for this, the locking piece 213a1 at the upper end is pressed and locked to the long hole by the elasticity of the bent piece, and the arc-shaped portion of the pressing member is mounted on the fixed frame. Therefore, the other end 30c is held and fixed by being sandwiched between the pressing member and the fixed frame.
In the configuration in which the bent piece 213a with the locking piece 213a is locked to the long hole 21h of the fixed frame using the elastic deformation, the pressing member 213 can be easily mounted on the fixed frame 21 and the end of the flexible printed circuit board. 30c can be securely held and fixed.
Here, the connection piece 30a of the flexible printed circuit board is inserted into the through hole 21g of the fixed frame through the notch 213b of the holding member 213 and extends to the outside, and another printed circuit board 31 (the first printed circuit board 31 on the outer surface of the fixed frame) The first electrical device on the member side) is connected to the connector 31a.

As described above, the one end portion 30b of the flexible printed circuit board is held by deforming the surface perpendicular to the longitudinal direction of the belt-like shape into an arc shape by the arc-shaped holding hole 231e of the first group lens frame, and the other end portion 30c is The surface perpendicular to the longitudinal direction of the belt is deformed and held in an arc shape by being sandwiched between the pressing member 213 and the fixed frame 21 and pressed against the inner surface of the fixed frame. If the surfaces perpendicular to the longitudinal direction are each deformed into an arc shape and the end portions 30a and 30b are held in this way, the resistance to bending in the vertical direction is increased on the surfaces perpendicular to the longitudinal direction and deformed in the vertical direction. It becomes difficult (it is hard to bend).
The holding hole 231e on the end face of the first group lens frame serves as an arc holding means for holding the one end 30b of the flexible printed board in an arc shape, and the holding member 213 presses the other end 30c against the inner surface of the fixed frame in an arc shape. Each functions as arc retaining means for retaining.

  The drive system of the photographic lens barrel 20 will be described. The pinion gear 211a of the zoom motor 211 is engaged with the drive gear 212 in the drive gear hole on the inner surface of the fixed frame, and the drive gear is a spur gear at the end of the rotary frame in the fixed frame. 22a is engaged. Therefore, when the zoom motor 211 is driven, the driving force is transmitted to the rotating frame 22 via the pinion gear 211a, the driving gear 212, and the spur gear 22a, and the helicoid screw 22c at the end of the rotating frame corresponds to the inner surface of the fixed frame. Since it is engaged with the helicoid screw 21c, the rotating frame 22 is guided by the helicoid screw 21c and moves along the optical axis O while rotating in the fixed frame.

The first group moving frame 23 is housed in the rotating frame 22, and the cam follower 23b of the first group moving frame is introduced from the common introducing groove 22d3 and engaged with the spiral first cam groove 22d1 on the inner surface of the rotating frame. Has been. The second group lens frame 24 is housed in the rotating frame 22, and the cam follower 24c of the second lens group is introduced from the common introduction groove 22d3 and engaged with the second cam groove 22e2. Then, the rotation stop 25b of the rectilinear ring is engaged with the rectilinear groove 21e on the inner surface of the fixed frame, and the rectilinear key 25a of the rectilinear ring is moved to the rectilinear key groove 231b of the first group lens frame in the first group moving frame 23, and the second The group lens frame is engaged with a straight key groove 24b.
Therefore, when the rectilinear ring 25 is non-rotatable and rectilinear with respect to the fixed frame 21, and the rotating frame 22 is moved while rotating, the first group moving frame 23 and the second group lens frame 24 are moved straight on the rectilinear key. Guided by 25a, it goes straight to a predetermined zoom position.
Thereafter, when the focus motor 231c is driven, the driving force is transmitted to the first group lens holding frame 231d via a reduction gear train (not shown), and the first group lens holding frame moves straight to the focus position. Focusing is done.

As described above, one end 30 b of the flexible printed circuit board 30 is held in the arc-shaped holding hole 231 e of the first group lens frame 231, and the other end 30 c is pressed against the inner surface of the fixed frame 21 by the pressing member 213. It is hold | maintained and it arrange | positions between a movable member (2nd member: 1st group lens frame) and a fixed member (1st member: fixed frame). Therefore, when the first group lens frame 231 moves between the tele position and the wide position in FIGS. 1A and 1B, the position of the bent portion 30d of the flexible printed circuit board moves with the movement, and the end portion 30b. , 30c to the bent part, the length of the straight part 30e changes.
That is, the bent portion 30d and the straight portion 30e of the flexible printed board serve as a connecting portion that electrically connects the first and second members. The holding hole 231e and the pressing member 213 hold the end of the connecting portion of the flexible printed circuit board 30 by deforming the shape of the cross section perpendicular to the longitudinal direction of the connecting portion and holding the deformation. Functions as a means.

  As shown in FIGS. 9 (C1) and (C2), in the flexible printed circuit board 130 held by the conventional method, the cross section perpendicular to the longitudinal direction is the same flat plate shape as before the holding even after the arrangement, so the longitudinal direction It is easy to deform in the vertical direction on a plane perpendicular to Therefore, when the first group lens frame (movable member; second member) 231 moves in the subject direction (X direction in the figure) and the straight portion 130e formed from the end portion 130b to the bent portion 130d becomes long, The part cannot maintain its linearity, deforms by its own weight, and bends downward. Then, if a part of the flexible printed board 130 that is bent approaches the vicinity of the photographic light beam 32 (see FIG. 1) to generate unnecessary reflected light, or enters the photographic light beam and blocks the photographic light beam, the image sensor The image on 10a is adversely affected.

On the other hand, in the present invention, both end portions 30b and 30c of the flexible printed circuit board are held in an arc shape, and after the arrangement, the cross section perpendicular to the longitudinal direction of the belt shape is deformed in an arc shape. Therefore, the resistance force against the vertical deflection is increased on the surface perpendicular to the longitudinal direction, and it becomes difficult to deform in the vertical direction (difficult to bend), and the first lens group frame 231 moves and moves from the end 30b to the bent portion 30d. Even if the straight portion 30e becomes long, the straight portion can maintain its linearity, and downward bending due to its own weight is suppressed.
As described above, the flexible printed circuit board 30 is restrained from being bent in a wide range in spite of a simple configuration in which both end portions 30b and 30c of the flexible printed circuit board are held in an arc shape. For this reason, a part of the flexible printed circuit board 30 does not approach the vicinity of the photographic light beam to generate unnecessary reflected light, and of course, it does not enter the photographic light beam 32 and block the photographic light beam. Therefore, adverse effects on the image on the image sensor due to the bending of the flexible printed circuit board 30 are prevented.

  As illustrated, in the configuration of the present invention in which both end portions 30b and 30c of the flexible printed board are deformed and held in an arc shape, a straight portion 30e extending from the end portion 30b to the bent portion 30d, and the bent portion 30d from the end portion 30c. Any of the straight portions 30e up to and below maintains its linearity, and downward bending due to its own weight is reliably suppressed. However, only one of the end portions 30b and 30c may be deformed into an arc shape, so that downward bending due to its own weight can be suppressed, and only one of the end portions 30b and 30c may be held in an arc shape. In this case, the straight portion 30e from the end 30b on the movable member side to the bent portion 30d is more easily bent than the straight portion 30e from the end 30c on the fixed member side to the bent portion 30d. It is preferable to hold.

  Further, the arc-shaped deformation of the both end portions 30b and 30c of the belt-like flexible printed circuit board is not limited to the shapes of FIGS. 9A1 and 9A2. For example, the holding hole 231e of the first lens group frame 231 has an upward convex arc shape as opposed to the downward convex arc shape shown in FIG. 3, and the pad 30e curved in the vertical direction has the end 30c and the fixed frame. 9 (B1) and (B2), as shown in FIGS. 9B1 and 9B, the end portions 30b and 30c are formed in an arc shape deformed upside down from FIGS. 9A1 and 9A2. Retained.

It is sufficient that the arc shape is a plane perpendicular to the longitudinal direction of the belt shape and is difficult to deform in the vertical direction, and a part of a circle as shown in FIGS. 9 (A1), (A2), (B1), and (B2), The shape is not limited to a shape without a portion, and may have a shape (mountain shape) having corners as illustrated in FIGS. 10A and 10B, and such a mountain shape is also included in the arc shape. For example, if the holding hole 231e of the first group lens frame 231 is formed in a corresponding shape and a pad having a corresponding shape is interposed between the inner surface of the fixed frame 21, both end portions 30b and 30c of the flexible printed circuit board are provided. Can be deformed and held in a desired chevron shape (arc shape).
In other words, the belt-shaped portion of the cross section orthogonal to the longitudinal direction of the flexible printed circuit board 30 is deformed and held so that the cross section coefficient is larger than the cross section coefficient calculated with a simple rectangular (square) cross section. Is important.

  As described above, according to the present invention, since the end portion of the belt-like flexible printed circuit board is held in an arc shape, the resistance to bending in the vertical direction is increased on the surface perpendicular to the longitudinal direction, and the belt is deformed in the vertical direction. It becomes difficult, the linearity of the straight part between the end part and the bent part is maintained, and downward bending due to its own weight is suppressed with a simple configuration. Therefore, a part of the flexible printed circuit board does not inadvertently move out of the predetermined range, and an adverse effect on the image due to the bending of the flexible printed circuit board is surely prevented.

In order to maintain an electrical connection between the stationary first member side electrical device and the movable second member side electrical device, the present invention provides a belt-like configuration between the first and second members. It can be applied to a wide range of electronic devices with flexible printed circuit boards.
The present invention can be applied not only to the taking lens barrel but also to other devices. For example, there is a member that moves in the vicinity of the flexible printed circuit board. It can also be applied to the purpose of preventing contact.
Furthermore, even if there is a flexible part of the flexible printed circuit board that does not involve deformation and movement of the flexible printed circuit board other than those described in the embodiment of the present invention, the flexible part can be The present invention can be applied so as not to move to an inadvertent position due to vibration of the entire device.

The longitudinal cross-sectional view along the optical axis of the taking lens-barrel accommodated in the digital camera which is an electronic device which concerns on one Example of this invention is shown, (A) is a longitudinal cross-sectional view in a tele position, (B) is The longitudinal cross-sectional view in a wide position is shown. FIG. 2 is a cutaway view of a portion X in FIG. 1. FIG. 2 shows a partial cross-sectional view of the electronic device viewed from the cross-sectional direction of line AA in FIG. 1. FIG. 2 is an exploded perspective view of the photographic lens barrel shown in FIG. 1. The pressing member is shown, (A) is a front view, (B) is a plan view, and (C) is a right side view. The rear view of the photographic lens barrel seen from the arrow B of FIG. 1 is shown. A straight traveling ring is shown, (A) is a plan view, and (B) and (C) are cross-sectional views taken along lines BB and CC in (A). The top view of a rectilinear ring is shown, (A) is a notch linear ring formed in parallel with the radial line R, (B) (C) is a notch which inclines and intersects with the radial line R at an angle. The attached straight ring is shown. The flexible printed circuit board is shown, (A1) is a perspective view of the flexible printed circuit board held in an arc shape of the present invention, (A2) is a view from the direction of arrow A of (A1); (B1) is a modified example (B2) is a perspective view from the direction B of (B1); (C1) is a perspective view of a flexible printed board held by a conventional method; (C2) is (C1) The arrow view from the arrow C direction of) is shown respectively. (A) (B) shows the modification of the circular arc shape of a flexible printed circuit board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Camera body 10a Image pick-up element 20 Shooting lens barrel (electronic device)
21 Fixed frame (first member)
213 Presser member (arc holding means for end 30c)
22 Rotating frame (second member in a broad sense)
22e Mounting groove 23 First group moving frame 231 First group lens frame (second member in a narrow sense)
231a First lens group 231c Focusing drive motor (electric device on the second member side)
231d First lens group holding frame 231e Arc-shaped holding hole (arc holding means of end 30b)
24 Second Group Lens Frame 24a Second Group Lens 25 Straight Advancing Ring 25a Straight Advancing Key 25b Anti-rotation 25c Notch 30 Flexible Printed Circuit Board 30a Connection Piece 30b, 30c End of Flexible Printed Circuit Board 31 Electric Board (Electricity on First Member Side) apparatus)

Claims (7)

A first member;
A second member that moves relative to the first member;
Having a bent portion, allowing the relative movement between the first member and the second member with the movement of the bent portion, and between the first member and the second member. A strip-shaped flexible printed circuit board that is electrically connected;
An arc holding means for holding the cross section perpendicular to the longitudinal direction of the belt in a circular arc shape on one end of the belt, and maintaining the linearity of the straight portion formed from the end to the bent portion;
An electronic device comprising: A first member;
A first electrical device provided on the first member;
A second member that moves relative to the first member;
A second electrical device provided on the second member;
A bending portion, allowing the relative movement between the first member and the second member with movement of the bending portion, and electrically connecting the first and second electric devices; A belt-shaped flexible printed circuit board to contact;
An arc holding means for holding a cross section perpendicular to the longitudinal direction of the flexible printed circuit board in an arc shape to prevent bending of a portion other than the bent portion;
An electronic device comprising: 3. The electronic apparatus according to claim 1, wherein the arc holding means holds and fixes the belt-like end portion of the flexible printed circuit board in an arc shape. The arc holding means includes a holding member that holds one of the belt-like end portions of the flexible printed circuit board in an arc shape with the first member, and a belt-shaped end portion of the flexible printed circuit board formed on the second member. The electronic device according to claim 1, further comprising at least one of an arc-shaped holding hole that holds the other of the two in an arc shape. 5. The electronic device according to claim 1, wherein the electronic device is a photographing lens barrel. A first member;
A second member that moves relative to the first member;
Having a bent portion, allowing the relative movement between the first member and the second member with the movement of the bent portion, and between the first member and the second member. A linear portion formed in a strip shape for electrical communication, and at least one of the strip-shaped end portions being held in an arc shape in a cross section perpendicular to the longitudinal direction of the strip shape and extending from the end portion to the bent portion. Flexible printed circuit board that maintains the linearity of
An electronic device comprising: A first member;
A second member;
A flexible printed circuit board having a communication portion for electrically communicating between the first member and the second member;
A holding means for deforming at least one end of the connecting portion of the flexible printed circuit board in a shape of a cross section perpendicular to the longitudinal direction of the connecting portion, and holding the one end while holding the deformation;
An electronic device comprising:

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