JP4647983B2 - Lens barrel - Google Patents

Description

  The present invention relates to a lens barrel, and more particularly to a lens barrel having a retractable optical element that can be retracted from a photographing optical axis.

  A retractable lens barrel that does not refract the photographic optical axis using a mirror, prism, or the like is generally unable to shorten the storage length beyond the total thickness of each optical element in the optical axis direction. There is a demand for further shortening and thinning. As one of the means for solving the problem, the applicant has proposed a zoom lens barrel that further shortens the storage length by moving a part of the optical system to a position outside the optical axis (Japanese Patent Laid-Open No. 2003-315861).

JP 2003-315861 A

  An object of the present invention is to further improve the space efficiency in a lens barrel that retracts a part of the optical system as described above to the outside of the optical axis.

The lens barrel of the present invention is rotationally driven by a rotation center axis substantially parallel to the optical axis of the photographing optical system, and a rotating ring for moving a plurality of optical elements constituting the photographing optical system forward and backward along the optical axis by the rotation. And an evacuation optical element that is positioned on the photographic optical axis at the time of photographing and is moved to an off-axis evacuation position that is retracted from the photographic optical axis when the lens barrel is housed. , And the eccentric position of the retracting optical element relative to the rotational center axis of the rotating ring is larger than the photographing optical axis. The photographing optical axis is positioned radially inside the rotating ring, the retracting optical element is retracted off-axis in the radial direction, and the rotating ring is positioned in front of the retracting optical element in the optical axis direction in the shooting state. When the lens barrel is retracted from the shooting state, the off-axis retract position Rotary ring to a position overlapping the moved retracted optical element and the direction perpendicular to the optical axis is characterized in that moves backward.

  The retracting optical element preferably includes an image sensor provided at the imaging position of the photographing optical system.

  Of the plurality of optical elements driven by the rotation of the rotating ring, the optical element positioned immediately before the retracting optical element is retracted when the lens barrel is retracted from the photographing state, and the retracting optical element is in the off-axis retracting position. If they overlap in the direction perpendicular to the optical axis, the lens barrel can be made thinner.

  Further, when the retracting optical element is located at the off-axis retracted position, the actuator is housed in the eccentric region on the opposite side of the imaging optical axis and the off-axis retracted position with respect to the rotation center axis of the rotating ring within the rotating ring. Space efficiency in the lens barrel becomes better.

According to the present invention as described above, a space can be secured in a region opposite to the eccentric direction of the photographing optical axis and the off-axis retracted position across the rotation center axis in the rotating ring. Thus, the space efficiency in the lens barrel can be increased. Further, it is possible to reduce the amount of movement when retracting moved over the evacuating optical element to an off-axis retracted position radially outward from the rotating ring, it can form a retracting mechanism compactly.

[Description of the entire lens barrel]
A zoom lens barrel 10 of the zoom lens camera whose cross section is shown in FIGS. 1 and 2 has a box-shaped housing 11 and a telescopic cylinder portion 12 supported in the housing 11 so as to be extendable and contractible. The outside of the housing 11 is covered with a camera exterior member, but the exterior portion is not shown. The imaging optical system of the zoom lens barrel 10 includes, in order from the object side, a first lens group 13a, a shutter 13b, a diaphragm 13c, a second lens group 13d, a third lens group 13e, a low-pass filter 13f, and a CCD image sensor (hereinafter, referred to as a “photograph”). CCD) 13g. As shown in FIG. 5, the CCD 13g is electrically connected to a control circuit 14a having an image processing circuit, displays an electronic image on a liquid crystal monitor 14b provided on the outer surface of the camera, and stores the electronic image data in a memory 14c. It is possible to record. In the photographing state shown in FIG. 2, all the optical elements constituting the photographing optical system are located on the same photographing optical axis Z1, but in the lens barrel housing (collapsed) state of FIG. 1, the third lens group 13e. The low-pass filter 13f and the CCD 13g move away from the photographing optical axis Z1 and retreat upward in the housing 11, and the second lens group 13d enters the space resulting from this retraction movement. Thereby, the storage length of the lens barrel can be shortened. The overall structure of the zoom lens barrel 10 including the optical element retracting mechanism will be described below. In the following description, the vertical direction when the body of the zoom lens camera equipped with the zoom lens barrel 10 is viewed from the front is defined as the y axis, and the horizontal direction as viewed from the front of the camera is defined as the x axis.

  The housing 11 includes a hollow box-shaped portion 15 and a hollow stationary ring portion 16 formed on the front wall 15a of the box-shaped portion 15 so as to surround the photographing optical axis Z1. The rotation center axis Z0, which is the center of the fixed ring portion 16, is parallel to the photographic optical axis Z1 and decentered downward from the photographic optical axis Z1. A retreat space SP (FIGS. 1 and 2) is formed in the box-shaped portion 15 above the fixed ring portion 16.

  A zoom gear 17 (FIG. 8) that can be rotated about an axis parallel to the rotation center axis Z0 is supported on the inner peripheral surface side of the fixed ring portion 16. The zoom gear 17 is rotated forward and backward by a zoom motor MZ (FIGS. 5, 10, and 11) supported by the housing 11. Further, on the inner peripheral surface of the fixed ring portion 16, a female helicoid 16a, a circumferential groove 16b having an annular shape around the rotation center axis Z0, and a straight traveling guide parallel to the rotation center axis Z0 (imaging optical axis Z1). A groove 16c is formed (see FIGS. 3 and 4).

  A helicoid ring (rotating ring) 18 is supported inside the fixed ring portion 16 so as to be rotatable about the rotation center axis Z0. The helicoid ring 18 has a male helicoid 18a screwed into the female helicoid 16a, and can advance and retreat in the optical axis direction while rotating according to the relationship between the female helicoid 16a and the male helicoid 18a. The helicoid ring 18 also has a rotation guide projection 18b on the outer peripheral surface in front of the male helicoid 18a. When the helicoid ring 18 is moved most forward with respect to the stationary ring portion 16 (FIGS. 2 to 4), the female helicoid 18 16a and male helicoid 18a are unscrewed and rotation guide projection 18b is slidably fitted in circumferential groove 16b, and helicoid ring 18 is restricted from moving in the optical axis direction and can only rotate in place. . An annular spur gear 18c having gear teeth parallel to the photographic optical axis Z1 is formed on the outer peripheral surface of the helicoid ring 18 at the same peripheral surface position as the male helicoid 18a, and the zoom gear 17 is connected to the spur gear 18c. Meshed. The zoom gear 17 is formed long in the axial direction, and always maintains meshing with the spur gear 18c from the housed state of the helicoid ring 18 shown in FIGS. 1 and 10 to the extended state shown in FIGS. The helicoid ring 18 is configured by combining two annular members that can be divided in the optical axis direction. FIGS. 10 and 11 show only the rear annular member of the helicoid ring 18.

  A linear guide ring 20 is supported inside the helicoid ring 18. As shown in FIG. 4, the rectilinear guide ring 20 is configured such that the rectilinear guide protrusion 20 a provided in the vicinity of the rear end thereof is slidably engaged with the rectilinear guide groove 16 c of the fixed ring portion 16, so that the rotation center axis Z 0 ( It is guided straight in a direction along the photographing optical axis Z1). The helicoid ring 18 is rotatable relative to the rectilinear guide ring 20 and in the optical axis direction via a rotation guide portion 21 provided between the inner peripheral surface of the helicoid ring 18 and the outer peripheral surface of the rectilinear guide ring 20. Are supported to move together. The rotation guide unit 21 includes a plurality of circumferential grooves provided at different positions in the axial direction, and radial protrusions that are slidably fitted in the circumferential grooves.

  The rectilinear guide ring 20 has a rectilinear guide groove 20b parallel to the rotation center axis Z0 (imaging optical axis Z1) on the inner peripheral surface, and a rectilinear guide protrusion 22a of the first group rectilinear guide ring 22 with respect to the rectilinear guide groove 20b. The straight guide protrusions 23a of the second group straight guide ring 23 are slidably engaged with each other. The first group rectilinear guide ring 22 linearly guides the first group support frame 24 in a direction parallel to the rotation center axis Z0 (imaging optical axis Z1) via the rectilinear guide groove 22b (FIG. 3) on the inner peripheral surface. The rectilinear guide ring 23 guides the second group support frame 25 rectilinearly in a direction parallel to the rotation center axis Z0 (imaging optical axis Z1) via the rectilinear guide key 23b. The first group support frame 24 supports the first lens group 13a via the focusing frame 29, and the second group support frame 25 supports the second lens group 13d.

  Inside the rectilinear guide ring 20, there is provided a cam ring 26 that can be rotated about the rotation center axis Z0. The cam ring 26 is guided through the rotation guide portions 27 and 28 (FIG. 4) in the first group. The ring 22 and the second group linear guide ring 23 are supported so as to be rotatable relative to each other and to move together in the optical axis direction. The rotation guide portion 27 includes a circumferential groove provided on the outer peripheral surface side of the cam ring 26 and a radial protrusion provided on the first group linear guide ring 22 and slidably fitted in the circumferential groove. . The rotation guide portion 28 includes a circumferential groove provided on the inner peripheral surface side of the cam ring 26 and a radial protrusion provided in the second group linear guide ring 23 and slidably fitted in the circumferential groove. Yes.

  As shown in FIG. 4, the cam ring 26 has a follower protrusion 26 a that protrudes radially outward. The follower protrusion 26 a passes through the follower guide groove 20 c of the linear guide ring 20, and the inner peripheral surface of the helicoid ring 18. Is engaged with the rotation transmission groove 18d. The rotation transmission groove 18d is a groove parallel to the rotation center axis Z0 (imaging optical axis Z1), and the follower protrusion 26a is slidable relative to the rotation transmission groove 18d in a state in which relative movement in the circumferential direction is restricted. It is fitted. That is, the rotation of the helicoid ring 18 is transmitted to the cam ring 26 by the relationship between the rotation transmission groove 18d and the follower protrusion 26a. On the other hand, the follower guide groove 20c is a guide groove having a circumferential groove centered on the rotation center axis Z0 and a lead groove inclined in the same direction as the female helicoid 16a, although the developed shape is not shown in the drawing. . Therefore, when the cam ring 26 is rotated by the helicoid ring 18, in the state where the follower protrusion 26a is positioned in the lead groove portion of the follower guide groove 20c, the rotation center axis Z0 (shooting optical axis Z1) while the cam ring 26 rotates. When the follower protrusion 26a is positioned in the circumferential groove portion of the follower guide groove 20c, the cam ring 26 rotates at a fixed position without moving back and forth.

  The cam ring 26 is a double-sided cam ring having cam grooves 26 b and 26 c on the outer peripheral surface and the inner peripheral surface, respectively. The cam groove 26 b on the outer peripheral surface side is a cam follower that protrudes radially inward from the first group support frame 24. A cam follower 25a projecting radially outward from the second group support frame 25 is slidably engaged with the cam groove 26c on the inner peripheral surface side. That is, when the cam ring 26 is rotated, the first group support frame 24 that has been guided straight through the first group straight guide ring 22 follows the rotation center axis Z0 (shooting optical axis Z1) according to the shape of the cam groove 26b. Advancing and retreating with a predetermined trajectory. Similarly, when the cam ring 26 is rotated, the second group support frame 25 guided in a straight line through the second group linear guide ring 23 follows the rotation center axis Z0 (shooting optical axis Z1) according to the shape of the cam groove 26c. It moves forward and backward in a direction with a predetermined trajectory.

  The second group support frame 25 supports the shutter 13b and the aperture 13c in an openable and closable manner at the front portion of a cylindrical portion 25b (see FIGS. 1 and 2) that holds the second lens group 13d. The shutter 13b and the diaphragm 13c can be opened and closed by a shutter drive actuator MS and a diaphragm drive actuator MA (FIGS. 5 and 15) supported by the second group support frame 25, respectively.

  The focusing frame 29 that holds the first lens group 13a is supported so as to be movable in the direction along the rotation center axis Z0 (shooting optical axis Z1) with respect to the first group support frame 24, and a focusing motor MF (FIG. 5). Thus, the focusing frame 29 can be moved back and forth.

  The zoom motor MZ, the shutter drive actuator MS, the aperture drive actuator MA, and the focusing motor MF are driven and controlled by the control circuit 14a. In the zoom lens barrel 10, the zoom motor MZ is driven when the main switch 14d (FIG. 5) of the camera is turned on, so that the photographing state shown in FIG. .

  To summarize the operation of the zoom lens barrel 10 described above, when the main switch 14d is turned on and the zoom gear 17 is rotationally driven in the extending direction in the lens barrel retracted state of FIG. 1, the helicoid ring 18 rotates and moves forward in the optical axis direction. The linear guide ring 20 moves along with the helicoid ring 18 and moves forward in the optical axis direction. Further, the cam ring 26 to which the rotational force is transmitted from the helicoid ring 18 relatively moves forward in the optical axis direction while rotating with respect to the linear guide ring 20. The first group rectilinear guide ring 22 and the second group rectilinear guide ring 23 move straight forward together with the cam ring 26 in the optical axis direction. Each of the first group support frame 24 and the second group support frame 25 moves relative to the cam ring 26 along a predetermined locus in the optical axis direction. That is, the movement amount of the first lens group 13a and the second lens group 13d in the optical axis direction when the lens barrel is extended from the housed state is the relative movement amount of the cam ring 26 with respect to the fixed ring portion 16 and the first group with respect to the cam ring 26. It is determined as the sum of the relative movement amounts of the support frame 24 and the second group support frame 25 (advancing and retreating amounts by the cam grooves 26b and 26c).

  FIG. 6 shows the helicoid ring 18, the cam ring 26, and the movement trajectories (the trajectories of the cam grooves 26 b and 26 c) of the first lens group 13 a and the second lens group 13 d with respect to the cam ring 26. The vertical axis indicates the amount of rotation of the lens barrel (angle position) from the lens barrel storage state to the telephoto end, and the horizontal axis indicates the amount of movement in the optical axis direction. As shown in the figure, the helicoid ring 18 rotates while the zoom lens barrel 10 is rotated to a substantially intermediate rotation angle θ1 from the retracted position (FIG. 1) to the wide end (FIG. 2 upper half, FIG. 3). It is extended forward in the optical axis direction, and after the rotation angle θ1, the above-mentioned fixed position rotation is performed until reaching the tele end (lower half of FIG. 2, FIG. 4). On the other hand, the cam ring 26 is fed forward in the optical axis direction while rotating to the rotation angle θ2 immediately before reaching the wide end from the lens barrel storage position, and from the rotation angle θ2 to the tele end, Similarly, the above-mentioned fixed position rotation is performed. The amount of movement in the optical axis direction of the first lens group 13a and the second lens group 13d in the zoom region from the wide end to the tele end is determined by the first group support frame 24 and the second group support frame with respect to the cam ring 26 rotating at a fixed position. 25 is determined by a relative movement amount (advancing / retreating movement amount by each cam groove 26b, 26c), and the magnification is changed by the relative movement of the first lens group 13a and the second lens group 13d. FIG. 7 shows actual movement trajectories of the first lens group 13a and the second lens group 13d, in which the movement amounts of the helicoid ring 18 and the cam ring 26 are combined with the movement amounts of the cam grooves 26b and 26c.

  In the zoom region between the wide end and the tele end, focusing is performed by moving the first lens group 13a independently in the optical axis direction by the focusing motor MF.

  The above is the operation of the first lens group 13a and the second lens group 13d. As described above, in the zoom lens barrel 10 of the present embodiment, the optical elements from the third lens group 13e to the CCD 13g are the optical axis of the photographic lens. The retraction movement is possible from the photographing position on Z1 to the retraction position Z2 outside the optical axis above the photographing position. Further, it is possible to perform image blur correction by moving the optical elements from the third lens group 13e to the CCD 13g along a plane orthogonal to the photographing optical axis Z1. Next, the retracting mechanism and the image blur correcting mechanism will be described.

  As shown in FIGS. 8 and 19, the third lens group 13e, the low-pass filter 13f, and the CCD 13g are held in a CCD holder 30 and unitized. The CCD holder 30 includes a holder main body 30a, a packing 30b, and a holding plate 30c. The third lens group 13e is held in the front end opening of the holder main body 30a, and a flange provided between the holder main body 30a and the packing 30b. A low pass filter 13f is sandwiched between the CCD 30g and the CCD 13g between the packing 30b and the holding plate 30c. The holder body 30a and the holding plate 30c are fixed to each other by three fixing screws 30d (FIGS. 15 and 18) that are spaced apart from each other with the center axis of the CCD holder 30 (shooting optical axis Z1 in the shooting state) as the center. ing. The three fixing screws 30d also fasten one end of the image transmission FPC 31 to the rear surface of the pressing plate 30c, and the support substrate of the CCD 13g and the image transmission FPC 31 are electrically connected.

  The image transmission FPC 31 extends from the connection end to the CCD 13g toward the retreat space SP in the housing 11, and includes a first linear portion 31a that is substantially orthogonal to the photographing optical axis Z1 and that extends upward. A U-shaped part 31b curved downward from the linear part 31a, a second linear part 31c going downward following the U-shaped part 31b, and upward again from the second linear part 31c It has the 3rd linear part 31d turned back (refer FIG. 1, FIG. 2). The third linear portion 31d is fixed along the inner surface of the front wall 15a of the housing 11, and the first linear portion 31a, the U-shaped portion 31b, and the second linear portion other than the third linear portion 31d. 31 c is a deformable portion that can be deformed in accordance with the movement of the CCD holder 30.

  The CCD holder 30 is provided with a left / right moving frame 32 via three adjustment screws 33 (FIGS. 15 and 18) that are spaced apart from each other with the central axis (photographing optical axis Z1 in the photographing state) of the CCD holder 30 as the center. Supported by Three compression coil springs 34 are arranged between the CCD holder 30 and the left and right moving frame 32. The shaft portions of the three adjustment screws 33 are respectively inserted into the compression coil springs 34. When the tightening amount of each adjustment screw 33 is changed, the compression amount of the corresponding compression coil spring 34 is changed. Since the adjustment screw 33 and the compression coil spring 34 are provided at three positions so as to surround the optical axis of the third lens group 13e, the CCD for the left and right moving frame 32 can be changed by changing the tightening amount of the three adjustment screws 33. The tilt adjustment of the holder 30, that is, the tilt adjustment of the optical axis of the third lens group 13e with respect to the photographing optical axis Z1 can be performed.

  As shown in FIG. 16, the left / right moving frame 32 is supported so as to be movable with respect to the up / down moving frame 36 via a left / right guide shaft 35 oriented in the x-axis direction. Specifically, the left-right moving frame 32 includes a square frame-shaped portion 32a that surrounds the CCD holder 30, and an arm portion 32b that extends laterally from the frame-shaped portion 32a, and an upper surface of the frame-shaped portion 32a. A spring support protrusion 32c is formed on the tip, and an inclined surface 32d and a position restricting surface 32e are formed at the tip of the arm portion 32b. The position restricting surface 32e is a plane parallel to the y axis. On the other hand, the vertical movement frame 36 includes a pair of movement restriction frames 36a and 36b that are spaced apart in the x-axis direction, a spring support portion 36c positioned between the pair of movement restriction frames 36a and 36b, and the spring support. The upper bearing portion 36d is located on the extension in the x-axis direction with respect to the portion 36c, and the lower bearing portion 36e is located below the upper bearing portion 36d. As shown in FIG. 17, the frame-shaped portion 32a is positioned in the space between the pair of movement restriction frames 36a, 36b, and the inclined surface 32d of the arm portion 32b and the position restriction between the movement restriction frame 36b and the upper bearing portion 36d. The left / right moving frame 32 is supported by the up / down moving frame 36 with the surface 32e positioned.

  One end and the other end of the left and right guide shaft 35 are fixed to the movement restricting frame 36a and the upper bearing portion 36d of the vertical movement frame 36, and the left and right guide shafts 35 are fixed to the movement restricting frame 36b and the spring support portion 36c. A through hole is formed through which is inserted. Left and right through holes 32x1 and 32x2 (FIG. 17) are formed in the arm portion 32b and the spring support protrusion 32c of the left and right moving frame 32 so as to be slidable with respect to the left and right guide shaft 35. The left and right through holes 32x1. , 32x2 and the left / right guide shaft 35 are supported so that the left / right moving frame 32 is movable with respect to the up / down moving frame 36 in the x-axis direction. A left and right moving frame biasing spring 37 is disposed between the spring support protrusion 32c and the spring support portion 36c so as to surround the left and right guide shaft 35. The left / right moving frame urging spring 37 is a compression coil spring, and urges the left / right moving frame 32 in a direction (leftward in FIG. 17) in which the spring support protrusion 32c approaches the movement restricting frame 36a.

  Upper and lower through holes 36y1 and 36y2 (FIG. 16) are further formed in the upper bearing portion 36d and the lower bearing portion 36e of the vertical movement frame 36, which are orthogonal to the photographing optical axis Z1 and face the y-axis direction. The vertical through hole 36y1 and the vertical through hole 36y2 are positioned on a straight line, and are slidably inserted into the vertical guide shaft 38 (FIGS. 8 and 9). Both end portions of the vertical guide shaft 38 are fixed to the housing 11, and therefore the vertical movement frame 36 can move in the camera along the vertical guide shaft 38 in the y-axis direction. More specifically, the imaging position of FIG. 1 in which the centers of the third lens group 13e, the low-pass filter 13f, and the CCD 13g in the CCD holder 30 are positioned on the imaging optical axis Z1, and the third lens group 13e and the low-pass filter 13f. The vertical movement frame 36 can be moved between the retraction position of FIG. 2 where the center of the CCD 13g is located at the retraction position Z2 outside the optical axis above the fixed ring portion 16.

  A spring hooking portion 36f projects from one side of the vertical movement frame 36, and the vertical movement frame biasing spring is provided between the spring hooking portion 36f and the spring hooking portion 11a (FIGS. 8 and 15) in the housing 11. 39 is stretched. The vertical movement frame biasing spring 39 is a tension spring, and biases the vertical movement frame 36 downward, that is, toward the photographing position shown in FIG.

  As described above, the left / right moving frame 32 holding the CCD holder 30 is supported so as to be movable in the left / right direction of the camera with respect to the up / down moving frame 36, and the up / down moving frame 36 is supported so as to be movable in the y-axis direction. Image blur (camera shake) correction can be performed by moving the CCD holder 30 in the x-axis direction and the y-axis direction, and a left and right drive lever 40 and a vertical drive lever 41 are provided as drive mechanisms. The left and right drive levers 40 and 41 are pivotally supported by a common lever rotation shaft 42 fixed in the housing 11 and parallel to the photographic optical axis Z1 so as to be independently rotatable (swingable). Yes.

  As shown in FIGS. 9 and 20, the left and right drive lever 40 has a lower end portion pivotally supported by a lever rotation shaft 42 and has a distal end force applying portion 40 a at the upper end portion. An operation pin 40b that protrudes rearward in the optical axis direction and a spring hooking portion 40c are provided in the vicinity of the tip applying force portion 40a. As shown in FIG. 12, the tip applying force portion 40 a of the left and right drive lever 40 is in contact with the first moving member 43. The first moving member 43 is supported by a pair of guide bars 44 (44a, 44b) so as to be slidable in the x-axis direction, and a nut 45 is in contact with the first moving member 43. The nut 45 has a rotation restricting groove 45a slidably fitted into the guide bar 44b and a screw hole 45b, and the drive shaft (feed screw) 46a of the first stepping motor 46 is screwed into the screw hole 45b. is doing. As shown in FIGS. 13 and 14, the nut 45 abuts from the left side of the first moving member 43 when viewed from the front of the camera. One end of the tension spring 47 is engaged with the spring hooking portion 40c of the left and right drive lever 40, and the other end of the tension spring 47 is engaged with the spring hooking portion 11b (see FIG. 12) in the housing 11. Yes. The tension spring 47 urges the left and right drive lever 40 to rotate in the direction in which the first moving member 43 is brought into contact with the nut 45, that is, in the counterclockwise direction in FIGS. 13, 14, and 20. From this structure, when the first stepping motor 46 is driven, the nut 45 moves along the guide bar 44, the first moving member 43 moves together with the nut 45, and the left and right drive lever 40 is swung. Specifically, when the nut 45 is moved toward the right in FIGS. 13 and 14, the first moving member 43 is pressed against the urging force of the tension spring 47, and the left and right drive lever 40 is moved as shown in FIG. Rotate clockwise. Conversely, when the nut 45 is moved toward the left in the figure, the first moving member 43 follows and moves to the left by the urging force of the tension spring 47, and the left and right drive lever 40 rotates counterclockwise. To do.

  As shown in FIG. 20, the operation pin 40 b provided on the left and right drive lever 40 is in contact with a position regulating surface 32 e provided at the tip of the arm portion 32 b of the left and right moving frame 32. Since the left / right moving frame 32 is urged to move to the left in the drawing by the left / right moving frame urging spring 37, the state where the position restricting surface 32e and the operation pin 40b are in contact with each other is maintained. When the left / right drive lever 40 swings, the position of the operation pin 40b is displaced in the x-axis direction, so that the left / right moving frame 32 moves along the left / right guide shaft 35. Specifically, when the left and right drive lever 40 is rotated in the clockwise direction in FIG. 20, the operation pin 40 b presses the position restricting surface 32 e and resists the urging force of the left and right moving frame urging spring 37. 32 moves to the right in the figure. Conversely, when the left / right drive lever 40 is rotated counterclockwise in FIG. 20, the operation pin 40 b moves away from the position restricting surface 32 e, so that the left / right moving frame 32 is moved by the urging force of the left / right moving frame urging spring 37. Follows and moves to the left.

  As shown in FIGS. 9 and 21, the vertical drive lever 41 has a lower end portion pivotally supported by a lever rotation shaft 42 in the same manner as the left and right drive lever 40, and has a tip applying portion 41 a at the upper end portion. The vertical drive lever 41 is longer than the left and right drive lever 40, and the tip applying force portion 41a projects upward from the tip applying force portion 40a. Between the lever rotation shaft 42 and the tip applying force portion 41a, a pressing slope 41b is formed to protrude sideways, and a spring hooking portion 41c is provided above the pressing slope 41b. As shown in FIG. 12, the tip applying force portion 41 a is in contact with the second moving member 50. The second moving member 50 is supported by a pair of guide bars 51 (51 a, 51 b) so as to be slidable in the x-axis direction, and a nut 52 is in contact with the second moving member 50. The nut 52 has a rotation restricting groove 52a slidably fitted into the guide bar 51b and a screw hole 52b, and the drive shaft (feed screw) 53a of the second stepping motor 53 is screwed into the screw hole 52b. is doing. As shown in FIGS. 13 and 14, the nut 52 abuts from the left side of the second moving member 50 when viewed from the front of the camera. One end of the tension spring 54 is engaged with the spring hook 41 c of the vertical drive lever 41, and the other end of the tension spring 54 is engaged with a spring hook (not shown) in the housing 11. The tension spring 54 urges the vertical drive lever 41 to rotate in the direction in which the second moving member 50 is brought into contact with the nut 52, that is, in the counterclockwise direction in FIGS. 13, 14, and 20. From this structure, when the second stepping motor 53 is driven, the nut 52 moves along the guide bar 51, the second moving member 50 moves together with the nut 52, and the vertical drive lever 41 swings. Specifically, when the nut 52 is moved toward the right in FIGS. 13 and 14, the second moving member 50 is pressed against the urging force of the tension spring 54, and the vertical drive lever 41 is moved as shown in FIG. Rotate clockwise. Conversely, when the nut 52 is moved toward the left in the figure, the second moving member 50 follows and moves to the left by the urging force of the tension spring 54, and the vertical drive lever 41 rotates counterclockwise. To do.

  As shown in FIG. 21, the pressing slope 41 b of the vertical drive lever 41 can contact a pressed pin 36 g that protrudes forward from the upper bearing portion 36 d of the vertical movement frame 36. Since the vertical movement frame 36 is moved and urged downward in the figure by the vertical movement frame urging spring 39, the pressed pin 36g and the pressing inclined surface 41b are kept in contact with each other. When the vertical drive lever 41 swings, the contact angle of the pressing slope 41b with the pressed pin 36g is displaced, and as a result, the vertical movement frame 36 moves along the vertical guide shaft 38. Specifically, when the vertical drive lever 41 is rotated in the clockwise direction of FIG. 21, the pressing slope 41b presses the pressed pin 36g upward, and resists the biasing force of the vertical movement frame biasing spring 39. Thus, the vertical movement frame 36 moves upward in the figure. On the other hand, when the vertical drive lever 41 is rotated counterclockwise in FIG. 21, the contact portion of the pressing slope 41b with the pressed pin 36g is displaced downward, so that the vertical movement frame biasing spring 39 biases the vertical movement lever biasing spring 39 upward and downward. The moving frame 36 moves downward.

  With the above structure, by driving the first stepping motor 46 forward and backward, the left and right moving frame 32 can be moved forward and backward in the x-axis direction, and by driving the second stepping motor 53 forward and backward. The vertical movement frame 36 can be moved forward and backward in the y-axis direction.

  The first moving member 43 and the second moving member 50 are respectively provided with plate-like portions 43a and 50a. By detecting the passage of the plate-like portions 43a and 50a by the photo interrupters 55 and 56, the left and right moving frames 32 and The initial position of the vertical movement frame 36 can be detected. The photo interrupters 55 and 56 are supported by holes 15a1 and 15a2 (FIG. 8) formed in the front wall 15a of the housing 11.

  The zoom lens camera according to the present embodiment includes an image shake detection sensor 57 (FIG. 5) that detects a moving angular velocity around two axes (vertical axis and horizontal axis of the camera) that are orthogonal to each other in a plane orthogonal to the photographing optical axis Z1. The image blur detection sensor 57 detects the magnitude and direction of the shake applied to the camera. The control circuit 14a obtains a moving angle by time-integrating the angular velocities in the biaxial directions detected by the image blur detecting sensor 57, and calculates the moving angle from the moving angle on the focal plane (the light receiving surface of the CCD 13g) and y The amount of movement of the image in the axial direction is calculated, and the driving amount and driving direction of the left and right moving frame 32 and the vertical moving frame 36 for each axial direction for canceling this image blur (first stepping motor 46, second stepping motor) 53 drive pulses). Based on this calculated value, the first stepping motor 46 and the second stepping motor 53 are driven and controlled. As a result, the left and right moving frame 32 and the vertical moving frame 36 are each driven by a predetermined amount in a predetermined direction to cancel the shake of the photographing optical axis Z1, and the image position on the focal plane is kept constant. The image blur correction mode can be entered by turning on the shooting mode changeover switch 14e (FIG. 5). When the shooting mode changeover switch 14e is turned off, the image blur correction function is stopped and normal shooting can be performed. .

  The zoom lens camera according to the present embodiment uses a part of the image blur correction mechanism described above to retract the third lens group 13e, the low-pass filter 13f, and the CCD 13g to the retracted position Z2 off the optical axis when the lens barrel is housed. To do. As shown in FIGS. 22 and 23, a retraction drive lever 60 is supported below the vertical movement frame 36 so as to be rotatable (swingable) about a rotation shaft 60a. A coaxial gear 61 that is rotatable coaxially with the rotation shaft 60 a is provided adjacent to the retracting drive lever 60, and is connected to the coaxial gear 61 from the interlocking gear 64 via two relay gears 62 and 63. Rotational force is transmitted. The revolving drive lever 60 and the rotation shaft 60a of the coaxial gear 61 and the rotation shafts of the relay gears 62 and 63 and the interlocking gear 64 are parallel to the rotation center axis Z0 (imaging optical axis Z1), respectively.

  As shown in FIGS. 22 and 23, the retracting drive lever 60 has a rotation transmission protrusion 60b having a fan-shaped cross section in the vicinity of the rotation shaft 60a, and the coaxial gear 61 rotates on the circumferential extension of the rotation transmission protrusion 60b. A transmission protrusion 61a is provided. The coaxial gear 61 transmits the rotational force to the retracting drive lever 60 by bringing the rotation transmission projection 61a into contact with the rotation transmission projection 60b, and when the rotation transmission projection 61b moves away from the rotation transmission projection 60b, the coaxial gear 61 The rotational force 61 is not transmitted to the retracting drive lever 60. The retraction drive lever 60 is urged to rotate counterclockwise in FIGS. 22 and 23 by a torsion spring 60c, and the housing 11 has a stopper that determines the rotation end of the retraction drive lever 60 in this urging direction. 65 is protrudingly provided.

  A pressed surface 66 including an arcuate surface 66a and a lead surface 66b is formed on the lower surface of the vertical movement frame 36. The arcuate surface 66a has a shape that forms a part of an arc centered on the rotation shaft 60a of the retracting drive lever 60, and the lead surface 66b has a connection portion with the arcuate surface 66a at the lowest position, and the arcuate surface 66a. It is formed as a linear inclined surface that gradually goes upward as it moves away from (as it approaches the left side surface of the vertical movement frame 36 in FIGS. 22 and 23).

  The interlocking gear 64 has a gear part 64a and a rotation restricting part 64b with different positions in the axial direction. The rotation restricting portion 64b includes a large-diameter cylindrical portion 64b1 having an incomplete cylindrical shape with a larger diameter than the gear portion 64a, and a plane portion obtained by cutting out a part of the large-diameter cylindrical portion 64b1 into a substantially straight (planar) shape. 64b2 has a non-circular (D-shaped) cross-sectional shape, and in the formation region of the flat surface portion 64b2, the tooth tip of the gear portion 64a protrudes outward in the radial direction from the rotation restricting portion 64b. . The plane portion 64b2 is formed as a plane including a straight line parallel to the rotation axis of the interlocking gear 64.

  The interlocking gear 64 is provided at a position facing the outer peripheral surface of the helicoid ring 18, and the spur gear 18 c faces the gear portion 64 a of the interlocking gear 64 according to the movement of the helicoid ring 18 in the optical axis direction (FIG. 11). 14) and a state (FIGS. 10 and 13) facing the rotation restricting portion 64b. When the helicoid ring 18 performs the above-mentioned fixed position rotation, the spur gear 18c meshes with the gear portion 64a. When the helicoid ring 18 moves in the retracted direction from the fixed position rotation state, the spar gear 18c faces the rotation restricting portion 64b, and the rotation transmission to the interlocking gear 64 is released.

  The operation of the retract drive lever 60 will be specifically described. FIG. 23 shows a state at the wide end. At the wide end, the third lens group 13e, the low-pass filter 13f, and the CCD 13g are located on the photographing optical axis Z1 (upper half of FIG. 2). Further, the helicoid ring 18 is in a fixed position rotation state (see FIG. 6), and the gear portion 64a of the interlocking gear 64 is engaged with the spur gear 18c of the helicoid ring 18. When the helicoid ring 18 rotates from the wide end in the storage direction, the coaxial gear 61 rotates in the clockwise direction in FIG. 23 via the interlocking gear 64 and the relay gears 62 and 63. As shown in the figure, since the rotation transmission protrusion 61a and the rotation transmission protrusion 60b are slightly separated at the wide end, the rotational force is not transmitted to the retracting drive lever 60 for a while after the coaxial gear 61 rotates. That is, the retracting drive lever 60 is held at a position where it comes into contact with the stopper 65 by the urging force of the torsion spring 60c. When the rotation transmission protrusion 61a comes into contact with and presses against the rotation transmission protrusion 60b, the retracting drive lever 60 starts to rotate clockwise against the torsion spring 60c. In the present embodiment, the timing for starting the rotation of the retracting drive lever 60 is substantially the same as the angular position θ2 at which the cam ring 26 starts the storing movement from the fixed position rotation to the rear in the optical axis direction (FIG. 6). reference).

  When the retracting drive lever 60 is rotated clockwise from the angular position of FIG. 23, the tip applying force portion 60d comes into contact with the lead surface 66b of the pressed surface 66 of the vertical movement frame 36. When the retracting drive lever 60 continues to rotate further in the clockwise direction, the retracting drive lever 60 pushes the up and down moving frame 36 upward according to the inclined shape of the lead surface 66b, and as a result, it is guided by the up and down guide shaft 38 to move up and down. The frame 36 moves upward in the housing 11.

  When the angular position of the helicoid ring 18 rotating in the storage direction exceeds θ1 in FIG. 6, the fixed position rotation ends, and the helicoid ring 18 is moved rearward in the optical axis direction while rotating. Then, the spur gear 18c releases the meshing with the gear portion 64a of the interlocking gear 64, and instead, the spur gear 18c faces the flat surface portion 64b2 of the rotation restricting portion 64b. Since the spur gear 18c and the gear portion 64a each have a predetermined length in the optical axis direction, when the helicoid ring 18 is switched from the fixed position rotation state to the rotation advance / retreat state at the θ1 position, the meshing is not released immediately, The engagement is released at the angle position θ3 that has advanced in the lens barrel storage direction. As the meshing is released, the rotational force of the helicoid ring 18 is not transmitted to the interlocking gear 64, and the upward rotation of the retracting drive lever 60 is stopped. 15 and 22 show the retracting drive lever 60 in a state where the upward rotation is stopped. As can be seen from the figure, the tip applying force portion 60d of the retracting drive lever 60 is in contact with the arcuate surface 66a over the boundary between the arcuate surface 66a and the lead surface 66b. At this time, the vertical movement frame 36 pushed upward by the retraction driving lever 60 is moved into the retraction space SP in the housing 11 as shown in FIG.

  The storage of the zoom lens barrel 10 is not completed at the angle position θ3 where the vertical movement frame 36 has completed the upward retraction movement, and the helicoid ring 18 and the cam ring 26 move further in the optical axis direction while further rotating. . When the storage state shown in FIG. 1 is reached, the cylindrical portion 25b of the second group support frame 25 that holds the second lens group 13d enters the space occupied by the up and down movement frame 36 at the time of photographing. Thereby, the thickness in the optical axis direction of the photographing optical system in the housed state can be reduced, and the zoom lens barrel 10 and the camera on which the zoom lens barrel 10 is mounted can be made thinner.

  In the lens barrel storage operation described above, after the angle position θ3 where the meshing between the gear portion 64a of the interlocking gear 64 and the spur gear 18c of the helicoid ring 18 is released, the flat portion 64b2 of the rotation restricting portion 64b faces the spur gear 18c. To do. In this opposed state, the flat surface portion 64b2 is close to the tooth tip (outer edge portion, tooth tip circle) of the spur gear 18c, and even if the interlocking gear 64 tries to rotate, the flat surface portion 64b2 contacts the outer edge portion of the spur gear 18c and rotates. Cannot be performed (see FIGS. 10 and 13). Accordingly, there is no possibility that the interlocking gear 64 rotates inadvertently in the lens barrel storage state, and the retracting drive lever 60 can be reliably locked at the ascending rotation position. That is, in the retracted state of FIG. 22, the retracting drive lever 60 is urged to rotate counterclockwise in FIG. 22 by the torsion spring 60c. The gear train is composed of the relay gears 62 and 63 and the interlocking gear 64. Since the contact relationship between the flat portion 64b2 of the interlocking gear 64 and the spur gear 18c functions as a rotation restricting means for the retracting drive lever 60, the retracting drive lever 60 can be securely attached without providing a complicated locking mechanism. It can be held in a stopped state.

  In addition, the arcuate surface 66a with which the tip applying portion 60d of the retracting drive lever 60 is in contact with the vertically moving frame 36 retracted upward is an arcuate surface centered on the rotation shaft 60a of the retracting drive lever 60. Therefore, even if the angle of the retracting drive lever 60 changes, the height position of the up and down moving frame 36 does not change and is maintained at a constant position as long as the tip applying force portion 60d is in contact with the arcuate surface 66a. The

  The operation of the retracting mechanism from the wide end to the storage is as described above. On the other hand, in the zoom range from the wide end to the tele end, the spur gear 18c of the helicoid ring 18 rotating at a fixed position and the gear portion 64a of the interlocking gear 64 maintain meshing, and the interlocking gear 64 rotates as the helicoid ring 18 rotates. Is done. However, when the ricoid ring 18 rotates from the wide end state shown in FIG. 23 in the tele end direction, the coaxial gear 61 rotates counterclockwise in FIG. 23, that is, in a direction in which the rotation transmission projection 61a is separated from the rotation transmission projection 60b. And rotated. Therefore, in the zoom region from the wide end to the tele end, the rotational force is not transmitted to the retract drive lever 60, and the retract drive lever 60 is maintained at the angular position in FIG. Thereby, the range of rotation of the retracting drive lever 60 is minimized, and an increase in the size of the lens barrel can be avoided.

  As shown in FIG. 24, when the vertical movement frame 36 is retracted to the off-optical axis retraction position Z2 side, the position restriction surface 32e provided on the arm portion 32b of the left / right movement frame 32 and the left / right drive lever 40 are provided. The engagement of the operation pin 40b is released, the left / right moving frame 32 is moved to the left in the figure by the urging force of the left / right moving frame urging spring 37, and the frame-like portion 32a is a movement restricting frame of the up / down moving frame It hits 36a. When the vertical movement frame 36 is moved again to the photographing optical axis Z1 side from this state, the inclined surface 32d of the horizontal movement frame 32 comes into contact with the operation pin 40b as shown by a two-dot chain line in FIG. Since the inclined surface 32d is inclined so as to guide the operation pin 40b toward the position regulating surface 32e according to the downward movement of the vertical movement frame 36, when the vertical movement frame 36 is lowered to the photographing position, it is shown in FIG. Thus, the operation pin 40b is again engaged with the position restricting surface 32e, and the frame-like portion 32a of the left and right moving frame 32 returns to the neutral position between the movement restricting frame 36a and the movement restricting frame 36b.

  25 to 32 show a second embodiment. In the first embodiment, the vertical drive lever 41 and the second stepping motor 53 are provided as the drive means for correcting the shake of the vertical movement frame 36, and the retraction drive lever 60 is provided as the drive means for retraction. In the second embodiment, the second stepping motor 70 also serves as these driving means. Therefore, members corresponding to the vertical drive lever 41, the second moving member 50, the guide bar 51, the nut 52, the second stepping motor 53, and the tension spring 54 in the first embodiment are provided in the second embodiment. No (see FIG. 29). In FIG. 25 to FIG. 32, portions common to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 27, 28, 30 and 31, the second stepping motor 70 is provided in the vicinity of the vertical guide shaft 38 and includes a drive shaft (feed screw) 70 a parallel to the vertical guide shaft 38. Yes. As shown in FIG. 26, the nut 71 has a rotation restricting groove 71a that is slidably engaged with the upper and lower guide shafts 38, and a screw hole 71b that is screwed into the drive shaft 70a. When the drive shaft 70a is rotated in the forward and reverse directions by driving 70, the nut 71 moves along the vertical guide shaft 38 in the y-axis direction. As shown in FIGS. 27, 28, 30, and 31, the nut 71 is in contact with the lower bearing portion 136 e of the vertical movement frame 136 from below. From this structure, when the second stepping motor 70 is driven, the nut 71 moves along the vertical guide shaft 38, and the vertical movement frame 136 moves along the vertical guide shaft 38. Specifically, when the nut 71 is driven upward, the nut 71 presses the lower bearing portion 136e upward, and the vertical movement frame 136 moves upward against the biasing force of the vertical movement frame biasing spring 39. Move to. Conversely, when the nut 71 is driven downward, the vertical movement frame 136 is moved downward by the urging force of the vertical movement frame urging spring 39.

  The left and right moving frame 132 is formed with a plate-like portion 32f by extending the arm portion 32b. The plate-like portion 32 f has an inverted L shape when viewed from the front of the camera, and is formed long in the y-axis direction so that the tip thereof reaches the vicinity of the lower bearing portion 136 e of the vertical movement frame 36. The vertical movement frame 136 is formed with a plate-like portion 36s at the tip of the lower bearing portion 136e. As shown in FIGS. 27 and 28, in the housing 11, a photo interrupter 155 capable of detecting the passage of the plate-like portion 32f provided in the left and right moving frame 132, and a plate shape provided in the up and down moving frame 136 are provided. A photo interrupter 156 capable of detecting passage of the unit 36s is provided. By detecting the passage of the plate-like portions 32f and 36s by the photo interrupters 155 and 156, the initial positions of the left and right moving frame 132 and the up and down moving frame 136 can be detected.

  In the photographing state between the wide end and the tele end, the second stepping motor 70 is within a range in which the third lens group 13e, the low-pass filter 13f, and the CCD 13g are not separated from the photographing optical axis Z1 (in a movable region for image blur correction). ), The vertical movement frame 136 is moved in the y-axis direction along the vertical guide shaft 38. In this photographing state, the nut 71 is located near the lower end of the drive shaft 70a (FIGS. 28 and 31). When the main switch 14d of the camera is turned off to enter the lens barrel storage state, the second stepping motor 70 moves the nut 71 to the vicinity of the upper end of the drive shaft 70a to move the vertical movement frame 136 away from the optical axis retracted position Z2. (FIGS. 27 and 30). The drive shaft 70a is configured as a long feed screw parallel to the vertical guide shaft 38 so that the vertical movement frame 136 can be reached from the photographing optical axis Z1 to the retracted position Z2 outside the optical axis. Specifically, the drive shaft 70a has an axial length that is longer than the distance between the photographing optical axis Z1 and the off-axis retracted position Z2 in the y-axis direction.

  The retraction movement amount in the y-axis direction of the vertical movement frame 136 is obtained by counting the number of driving pulses of the second stepping motor 70 from the initial position detected by the photo interrupter 156. When the number of pulses reaches a predetermined number, 2 Stepping motor 70 is stopped. Thereby, the vertical movement frame 136 is accommodated in the retreat space SP (FIGS. 1 and 2) in the housing 11. Note that the timing for starting and ending the retracting operation of the vertical movement frame 136 can be arbitrarily set. For example, as in the first embodiment, the retracting operation may be started at the position θ2 in FIGS. 6 and 7 and the driving of the second stepping motor 70 may be controlled so that the retracting operation is completed at the position θ3.

[Description of features of the present invention]
As shown in FIGS. 13 and 14 in the first embodiment and as shown in FIGS. 30 and 31 in the second embodiment, the photographing optical axis Z1 of the zoom lens barrel 10 is located inside the helicoid ring 18. It is eccentric to the upper side with respect to the rotational axis Z0 of the rotary member such as the helicoid ring 18 and the cam ring 26. When the lens barrel is stored, the CCD holder 30 is driven further upward from the photographing optical axis Z1, and the centers of the third lens group 13e, the low-pass filter 13f, and the CCD 13g are located above the fixed ring portion 16 (the helicoid ring 18). It is located at a retracted position Z2 outside the optical axis on the outer side in the radial direction . That is, the photographing optical axis Z1 and the retreat position Z2 such as the CCD 13g are both eccentrically positioned upward with respect to the rotation center axis Z0. Further, the retracted position Z2 outside the optical axis of the third lens group 13e, which is the retracting optical element, the low-pass filter 13f, and the CCD 13g is set to the outside in the radial direction of the helicoid ring 18 which is a movable member in the zoom lens barrel 10. Yes. With this configuration, when the lens barrel is housed, the retraction optical element (the third lens group 13e, the low-pass filter 13f, and the CCD 13g) and the movable member such as the helicoid ring 18 are prevented from interfering with each other, and the zoom lens barrel 10 It is possible to secure a large space under the rotation center axis Z0.

  That is, conventionally, the space obtained inside the annular member constituting the lens barrel has an annular shape centering on the axis of the annular member, and a shutter, an actuator for driving a diaphragm and the like are incorporated in the annular space. Ingenuity has been made. However, in a narrow annular space, there are large restrictions on the shape and size of the member to be stored, and the annular member may be increased in diameter to increase the storage space. On the other hand, in the zoom lens barrel 10 of the present embodiment, since a wide space is obtained below the rotation center axis Z0 as described above, the diameter of the annular member such as the helicoid ring 18 is not increased. The components inside the lens barrel can be efficiently stored in the space. Specifically, when the zoom lens barrel 10 is housed, the shutter drive actuator MS and the aperture drive actuator MA are housed in the space below the rotation center axis Z0 in the helicoid ring 18 as shown in FIG. Both the shutter drive actuator MS and the aperture drive actuator MA have a cylindrical (columnar) outer shape having the same diameter as that of the cylindrical portion 25b of the second group support frame 25, but have a sufficient space. Can be arranged without difficulty.

  Further, in the zoom lens barrel 10 of the present embodiment, the CCD 13g and the like are retreated from the photographing optical axis Z1 decentered upward from the rotation center axis Z0 to the retreat position Z2 further above the optical axis. The amount of movement is kept small. That is, assuming that the photographing optical axis coincides with the rotation center axis Z0, the movement amount during retraction is from the rotation center axis Z0 to the retraction position Z2 outside the optical axis, which is larger than in the present embodiment. Further, even when the photographing optical axis Z1 is decentered from the rotation center axis Z0, the moving direction at the time of retreating is directed through the rotation center axis Z0 in the direction opposite to the photographing optical axis Z1 (downward in the embodiment). In this case, the retreat movement amount is further increased. On the other hand, according to the retracting structure of the present application, since the moving amount of the retracting optical element such as the CCD 13g is small, the drive mechanism can be made compact so that the lens barrel can be downsized.

  As mentioned above, although this invention was demonstrated based on illustration embodiment, this invention is not limited to this embodiment. For example, the embodiment is an example applied to a zoom lens barrel. However, the present invention is not limited to a zoom lens barrel and is a single focal point as long as it is a lens barrel that switches between a photographing state and a retracted (collapsed) state. It can also be applied to lens barrels.

  In addition, as a member provided in an effective space obtained inside the rotary ring, a member other than an actuator for shutter driving or aperture driving may be selected.

It is sectional drawing in the accommodation state of the retractable zoom lens barrel to which this invention is applied. It is sectional drawing of the imaging state of the zoom lens barrel. It is sectional drawing to which some were enlarged in the wide end of the zoom lens barrel. It is sectional drawing which expanded a part in the tele end of the zoom lens barrel. It is a block diagram which shows the main electric circuit structures of a camera provided with the zoom lens barrel. It is a conceptual diagram which shows each movement locus | trajectory of a helicoid ring and a cam ring, and the movement locus | trajectory of the 1st lens group and 2nd lens group by a cam ring. It is a conceptual diagram which shows each synthetic | combination movement locus | trajectory of a 1st lens group and a 2nd lens group including the movement locus | trajectory of a helicoid ring and a cam ring. It is a disassembled perspective view of a zoom lens barrel. It is a disassembled perspective view which shows the principal part of an image shake correction mechanism and a retracting mechanism. FIG. 6 is a front perspective view of an image shake correcting mechanism and a retracting mechanism, showing a retracted state of the CCD holder when the lens barrel is stored. It is a front perspective view of an image shake correction mechanism and a retracting mechanism, showing a state where the CCD holder is advanced on the optical axis during photographing. FIG. 12 is a rear perspective view of the main part of the image blur correction mechanism as viewed from the back side of FIGS. 10 and 11. It is the front view which looked at the state of Drawing 10 from the optical axis direction front. It is the front view which looked at the state of Drawing 11 from the optical axis direction front. It is the back perspective view which looked at the retreat state of Drawing 10 and Drawing 13 from the back side. It is a front perspective view which shows the left-right movement frame and vertical movement frame which support a CCD holder. It is a front view of a left-right moving frame and a vertical moving frame. It is a rear view of a left-right moving frame and a vertical moving frame. FIG. 18 is a cross-sectional view of the CCD holder, the left / right moving frame, and the up / down moving frame along the D1-D1 section line of FIG. 17. It is a front view for demonstrating the effect | action of the image blur correction of the left-right direction by a left-right drive lever. It is a front view for demonstrating the effect | action of the image blur correction of the up-down direction by an up-down drive lever. It is a front view which shows the retraction | saving state of the CCD holder by the retracting drive lever, the left-right moving frame, and the up-down moving frame. FIG. 6 is a front view showing a state where the push-up by the retreat drive lever is released and the CCD holder, the left / right moving frame, and the up / down moving frame are returned to the positions on the optical axis for photographing. It is a front view for demonstrating the relationship between the up-down direction operation | movement of a CCD holder, a left-right movement frame, and a vertical movement frame, and a left-right drive lever. It is a disassembled perspective view of the zoom lens barrel in the 2nd Embodiment of this invention. FIG. 10 is an exploded perspective view illustrating main parts of an image shake correcting mechanism and a retracting mechanism in a second embodiment. FIG. 10 is a front perspective view of an image blur correction mechanism and a retracting mechanism, showing a retracted state of the CCD holder when the lens barrel is stored in the second embodiment. FIG. 6 is a front perspective view of an image shake correction mechanism and a retracting mechanism, showing a state in which the CCD holder is advanced on the optical axis during shooting in the second embodiment. FIG. 29 is a rear perspective view of the main part of the image blur correction mechanism in the x-axis direction when viewed from the back side of FIGS. It is the front view which looked at the state of FIG. 27 from the optical axis direction front. It is the front view which looked at the state of FIG. 28 from the optical axis direction front. It is a front perspective view which shows the left-right movement frame and vertical movement frame which support a CCD holder in 2nd Embodiment.

Explanation of symbols

MZ Zoom motor SP Retraction space Z0 Rotation center axis Z1 Imaging optical axis Z2 Off-axis retraction position 10 Zoom lens barrel 11 Housing 12 Telescopic cylinder portion 13a First lens group 13b Shutter 13c Aperture 13d Second lens group 13e Third lens group (Evacuation optical element)
13f Low-pass filter (retraction optical element)
13g CCD image sensor (retraction optical element)
14a Control circuit 16 Fixed ring part 17 Zoom gear 18 Helicoid ring (rotating ring)
18c Spur gear 20 Straight guide ring 22 First group guide ring 23 Second group guide ring 24 First group support frame 25 Second group support frame 26 Cam ring 30 CCD holder 31 Image transmission FPC
32 132 Left and right moving frame 35 Left and right guide shaft 36 136 Up and down moving frame 37 Left and right moving frame biasing spring 38 Up and down guide shaft 39 Vertical moving frame biasing spring 40 Left and right drive lever 41 Up and down drive lever 43 First moving member 46 First stepping motor 50 Second moving member 53 Second stepping motor 55 56 155 156 Photo interrupter 60 Retraction drive lever 60a Rotating shaft 60b Rotation transmission projection 60c Torsion spring 61 Coaxial gear 61a Rotation transmission projection 62 63 Relay gear 64 Interlocking gear 64a Gear portion 64b Rotation Regulating portion 64b1 Large diameter cylindrical portion 64b2 Flat portion 65 Stopper 66 Pressed surface 66a Arc surface 66b Lead surface 70 Second stepping motor 70a Drive shaft 71 Nut

Claims (4)

A rotating ring that is rotationally driven by a rotation center axis substantially parallel to the optical axis of the imaging optical system, and moves a plurality of optical elements constituting the imaging optical system forward and backward along the optical axis by the rotation;
A retracting optical element that is positioned on the imaging optical axis during imaging and moved to an off-axis retracted position that is retracted from the imaging optical axis when the lens barrel is retracted;
With
The photographing optical axis and the off-axis retracted position of the retracting optical element are decentered in the same direction with respect to the rotation center axis of the rotating ring ;
The retraction optical element has an off-axis retraction position larger than the photographing optical axis with respect to the rotation center axis of the rotating ring, and the photographing optical axis is located radially inward of the rotating ring, so that the retraction optical The off-axis retract position of the element is radially outward of the rotating ring; and
The rotating ring is positioned in front of the retracting optical element in the photographing state in the optical axis direction, and in a direction perpendicular to the optical axis with respect to the retracting optical element moved to the off-axis retracting position when changing from the photographing state to the lens barrel retracting state. Moving backwards to the overlapping position;
A lens barrel characterized by 2. The lens barrel according to claim 1, wherein the retracting optical element includes an image sensor provided at an imaging position of the photographing optical system. 3. The lens barrel according to claim 1, wherein, among a plurality of optical elements driven by the rotation of the rotating ring, an optical element positioned immediately before the retracting optical element changes from a shooting state to a lens barrel storage state. A lens barrel that is retracted and overlaps the retracting optical element at the off-axis retracting position in a direction perpendicular to the optical axis. The lens barrel according to any one of claims 1 to 3 , wherein when the retracting optical element is located at an off-axis retracted position, the photographing optical axis and the rotation optical axis of the rotating ring are within the rotating ring. A lens barrel in which an actuator is housed in an eccentric region opposite to an off-axis retracted position.

Images