JP2017146330A - Lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel that is downsized and high in lens position accuracy.SOLUTION: A lens barrel comprises: a stationary member 9; an optical member; a holding member 3 that holds the optical member; a frame member 8 that is held by the stationary member 9, and parallely moves in an in-plane orthogonal to an optical axis to thereby correct an image tremor of a subject image to be image-formed on an image pick-up element through an imaging optical system including the optical member; a rotary axis 5 that pivotally supports the holding member 3 to the frame member 8, and allows the holding member 3 to rotate in the in-plane orthogonal to the optical axis with respect to the frame member 8 between a shooting position of the optical member on the optical axis and a retreat position thereof retreating from on the optical axis; an urging member that urges the holding member 3 toward the hooting position; and a retreat drive member 6 that is rotatably held in the stationary member 9, and moves the holding member against urging force of the urging member from the shooting position to the retreat position. A travelling range of the retreat drive member 6 retreating from the shooting position to the retreat position does not overlap the rotary shaft 5 in a plane orthogonal to the optical axis, and the retreat drive member 6 overlaps the rotary shaft 5 in a direction parallel with the optical axis.SELECTED DRAWING: Figure 16

Description

The present invention relates to an optical apparatus such as an imaging device such as a digital camera or a digital video camera, an interchangeable lens for a digital single lens reflex camera, an observation device such as a binocular, a telescope, or a field scope.

  Many recent imaging devices such as digital cameras are equipped with an image blur correction device for suppressing image blur during shooting. As such an image blur correction device, a correction lens incorporated in an imaging optical system or a holding member that holds an image sensor is moved in a plane perpendicular to the optical axis, thereby causing image blur caused by camera shake during shooting. Technology to relieve this is known.

  The imaging device described in Patent Literature 1 includes a holder member that holds a correction lens, a holder shaft that is press-fitted into a sleeve of the holder member, and a bearing portion that rotatably holds the holder shaft at both ends of the holder shaft. A frame member, a base plate member that holds the frame member in a rollable manner, and a lever member that switches the holder member between a photographing position and a retracted position, and the frame member and the holder member can be moved within a plane orthogonal to the optical axis. doing. When the lens barrel is retracted, the holder member is retracted from the optical axis by the lever member, and another lens group is accommodated in the space where the holder member was disposed at the time of photographing. Thereby, size reduction of the imaging device when the lens barrel is in the retracted state is achieved.

Japanese Patent Laying-Open No. 2015-121595

  However, since the lever member travels behind the frame member in the technique described in Patent Document 1, the holder shaft is placed in the space excluding the thickness of the lever member from the image blur correction device. Need to be placed. Therefore, the holder shaft is shortened, and the entire sleeve length of the holder member may be shortened. By reducing the overall length of the sleeve of the holder member, when the hole positions at both ends of the sleeve in the optical axis direction are shifted in the direction perpendicular to the optical axis, the amount of inclination of the holder member with respect to the optical axis is increased, and the lens position accuracy is increased. May be lowered.

  On the other hand, if the entire sleeve length of the holder member is increased, the image blur correction device may be increased in size and the lens barrel may be increased in size.

  It is an object of the present invention to provide a lens barrel that is small and has high lens position accuracy.

In order to achieve the above object, a lens barrel according to the present invention includes:
A fixing member, an optical member,
A holding member for holding the optical member;
A frame member that is supported by the fixing member and corrects an image blur of a subject image formed on an imaging element through a photographing optical system including the optical member by translating in a plane orthogonal to the optical axis;
The holding member is pivotally supported on the frame member, and the holding member is moved with respect to the frame member between a photographing position where the optical member is located on the optical axis and a retracted position where the optical member is retracted from the optical axis. A rotation shaft that can rotate in a plane orthogonal to the shaft;
A biasing member that biases the holding member toward the photographing position;
A retraction driving member that is rotatably held by the fixing member and moves the holding member from the photographing position to the retraction position against the urging force of the urging member;
The travel range in which the retract drive member travels from the shooting position to the retract position and the rotation axis do not overlap on a plane perpendicular to the optical axis,
The retract drive member and the rotation shaft overlap in a direction parallel to the optical axis.

  According to the present invention, since the entire length of the sleeve of the holder member can be increased in a limited space, it is possible to provide a lens barrel that is small and has high lens position accuracy.

It is the perspective view which looked at the digital camera concerning the embodiment of the present invention from the front side (subject side). It is the perspective view which looked at the lens barrel with which the digital camera of FIG. 1 is provided from the front side. It is sectional drawing containing the optical axis of the lens-barrel of FIG. 1 is a perspective view of an image blur correction apparatus according to an embodiment of the present invention. FIG. 5 is an exploded perspective view of the image blur correction device in FIG. 4. It is a front view which shows a part of image blur correction apparatus of FIG. It is the perspective view seen from the back side which shows the relationship between a 3rd group holder, a 3rd group frame, and a 3rd group lever. FIG. 5 is a side view of the image blur correction device of FIG. 4. It is sectional drawing of arrow AA shown in FIG. It is sectional drawing of arrow BB shown in FIG. FIG. 5 is a front view including a holder shaft and a lever shaft of the image blur correction device of FIG. 4. It is sectional drawing of arrow CC shown in FIG. FIG. 5 is a front view including the image blur correction device of FIG. 4 and a rectilinear cylinder. It is sectional drawing of arrow DD shown in FIG. It is sectional drawing of arrow DD shown in FIG. It is sectional drawing of arrow DD shown in FIG. It is a rear view which shows the relationship between a 3 group frame and the driving | running | working area | region of a 3 group lever. It is sectional drawing containing the holder shaft and optical axis of the lens-barrel of FIG. It is a rear view which shows the relationship between a 3rd group flame | frame and a 3rd group ground plane. It is the perspective view which looked at the 4th group holder from the front side.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Here, a so-called compact type digital camera is taken up as an example of an optical apparatus provided with the image blur correction apparatus according to the present invention. However, the present invention is not limited to this.

  FIG. 1 is a perspective view of a digital camera according to an embodiment of the present invention as viewed from the front side (subject side). FIG. 2 is a perspective view of the lens barrel included in the digital camera of FIG. 1 as seen from the front side.

  The digital camera according to the present embodiment has a structure in which a retractable zoom lens barrel 100 (hereinafter referred to as “lens barrel 100”) is disposed on the front side of the camera body 101. The zoom driving unit 31 performs the extending operation / retracting operation of the lens barrel 100.

  The lens barrel 100 is moved from the retracted position to the photographing position by the extension operation, so that various lenses constituting the lens barrel 100 are arranged on the optical axis (photographing optical axis), thereby enabling photographing with a digital camera. It becomes possible. When the lens barrel 100 is at the photographing position, the photographing magnification can be changed by controlling the positions of the various lenses on the optical axis. When the power of the digital camera is turned off, the lens barrel 100 is retracted, and the lens barrel 100 moves from the photographing position to the retracted position.

  FIG. 3 is a cross-sectional view including the optical axis of the lens barrel 100. 3A is a cross-sectional view when the lens barrel 100 is in the photographing position, and FIG. 3B is a cross-sectional view when the lens barrel 100 is in the retracted position. In FIG. 3, the left side in the figure indicates the subject side.

  The lens barrel 100 includes a first group lens 23, a first group holder 24a that holds the first group lens 23, a first group barrel 24b that holds the first group holder 24a, a second group lens 25, and a second group lens 25. A second group holder 26 is provided. The lens barrel 100 includes a third group lens 2a, 2b, a third group holder 3 that holds the third group lens 2a, 2b, a fourth group lens 27, and a fourth group holder 28 that holds the fourth group lens 27. A fifth group lens 29 and a sensor holder 30 that holds the fifth group lens 29 are provided.

  The first group lens 23, the first group holder 24a, and the first group barrel 24b constitute a first group unit. The second group lens 25 and the second group holder 26 constitute a second group unit. The third group lenses 2a and 2b and the third group holder 3 constitute a third group unit. The fourth group lens 27 and the fourth group holder 28 constitute a fourth group unit. The fifth group lens 29 and the sensor holder 30 constitute a fifth group unit. The first group lens 23, the second group lens 25, the third group lenses 2a and 2b, the fourth group lens 27, and the fifth group lens 29 constitute a photographic optical system of the lens barrel 100.

  A shutter unit 32 is disposed between the second group unit and the third group unit. The shutter unit 32 moves a subject between a pair of shutter blades (not shown) between a position where the light path is shielded and a position where the light path is retracted within a plane orthogonal to the optical axis, thereby forming an image on the image sensor 36. Adjust the luminous flux.

The sensor holder 30 supports a focus drive unit (not shown) and a zoom drive unit 31.
The focus driving unit performs a focusing operation by moving the fourth group holder 28 holding the fourth group lens 27 forward and backward in the optical axis direction, and the zoom driving unit 31 moves the third group unit from the first group unit back and forth in the optical axis direction. The zoom operation is performed. The zoom mechanism will be described below.

  A fixed cylinder 22 is disposed on the outermost periphery of the lens barrel 100, and cam grooves 22a and rectilinear key grooves 22b are formed at three locations at substantially equal intervals in the circumferential direction on the inner periphery of the fixed cylinder 22. Yes. An outer cam cylinder 34 is disposed inside the fixed cylinder 22. A follower (not shown) provided at three locations at substantially equal intervals in the circumferential direction is engaged with the outer circumferential portion of the outer cam cylinder 34 in each of the cam grooves 22 a of the fixed cylinder 22. The zoom drive unit 31 rotationally drives the outer cam cylinder 34. When the outer cam cylinder 34 is rotationally driven by the zoom drive unit 31, it moves in the optical axis direction along the lift of the cam groove 22 a while rotating with respect to the fixed cylinder 22.

  An outer rectilinear cylinder 35 is disposed inside the outer cam cylinder 34. A rectilinear key groove 35 a is formed on the inner periphery of the outer rectilinear cylinder 35, and a circumferential groove 35 b is formed on the outer periphery of the outer rectilinear cylinder 35. A plurality of bayonet claws (not shown) that engage with a circumferential groove 35b formed in the outer peripheral portion of the outer rectilinear cylinder 35 are formed in the inner peripheral portion of the outer cam cylinder 34 in the circumferential direction and the optical axis direction. . Further, a rectilinear key (not shown) that engages with the rectilinear key groove 22 b of the fixed cylinder 22 is formed on the outer peripheral portion of the outer rectilinear cylinder 35. Therefore, the outer rectilinear cylinder 35 moves linearly in the optical axis direction along the rectilinear key groove 22b of the fixed cylinder 22 as the outer cam cylinder 34 rotates.

  An inner cam cover 33 is disposed inside the outer rectilinear cylinder 35. Further, the inner cam cylinder 20 is disposed inside the inner cam cover 33. A cam groove 20a, a shutter cam groove 20b, and a second group cam groove 20c are formed on the inner peripheral portion of the inner cam cylinder 20 at three substantially equal intervals in the circumferential direction. On the outer peripheral portion of the inner cam cylinder 20, a first group cam groove 20 d is formed which is provided at three locations at substantially equal intervals in the circumferential direction. Further, a follower 20f, an inner cam cover engaging portion 20g, and a drive key 20h are formed on the outer peripheral portion of the inner cam cylinder 20 at three locations at substantially equal intervals in the circumferential direction (see FIG. 14B). ).

  The inner cam cover 33 has three engagement pawls (not shown) that engage with the inner cam cover engaging portion 20g of the inner cam cylinder 20 and three detents that engage with the drive key 20h of the inner cam cylinder 20. A portion (not shown) is formed. Further, the drive key 20 h of the inner cam cylinder 20 is engaged with three key grooves (not shown) provided on the inner peripheral portion of the outer cam cylinder 34. As a result, the inner cam cylinder 20 rotates around the optical axis in the same phase as the outer cam cylinder 34, and the inner cam cover 33 rotates about the optical axis integrally with the inner cam cylinder 20 as the inner cam cylinder 20 rotates. While moving in the optical axis direction.

  The inner cam cylinder 20 holds a rectilinear cylinder 21 on its inner periphery so as to be relatively rotatable. A rectilinear plate 19 is integrally attached to the rectilinear cylinder 21. The rectilinear plate 19 is formed with a rectilinear key 19 a (see FIG. 14) that engages with a rectilinear key groove 35 a provided on the inner periphery of the outer rectilinear cylinder 35. The straight cylinder 21 is formed with a first group guide key 21b, a second group guide groove (not shown), and a third group guide groove 21d. Further, the rectilinear cylinder 21 is formed with a retracting introduction surface 21e (see FIG. 14) that contacts the third group lever 6 (see FIGS. 4 and 5) and a retreat completion surface 21f that contacts the third group lever 6 and a flange 21g. ing. The rectilinear cylinder 21 is rotatably held with respect to the inner cam cylinder 20 by the flange 21g and the rectilinear plate 19, and moves integrally with the inner cam cylinder 20 in the optical axis direction.

  A first group follower (not shown) is provided at six locations at substantially equal intervals in the circumferential direction on the inner periphery of the first group barrel 24b. These six first-group followers are respectively engaged with six first-group cam grooves 20d provided on the outer peripheral portion of the inner cam cylinder 20, and are guided by the first-group guide key 21b of the rectilinear cylinder 21, The first group holder 24a and the first group barrel 24b are moved forward and backward in the optical axis direction integrally.

  On the outer periphery of the second group holder 26, a second group follower (not shown) is provided at three locations at substantially equal intervals in the circumferential direction. These two second group followers are respectively engaged with three second group cam grooves 20c provided on the inner peripheral portion of the inner cam cylinder 20, and are guided by a second group guide groove (not shown) of the rectilinear cylinder 21. Thus, the second group holder 26 is supported so as to be able to advance and retract in the optical axis direction.

  On the outer periphery of the shutter unit 32, three shutter followers 32a are provided at substantially equal intervals in the circumferential direction. Each of these three shutter followers 32a engages with three shutter cam grooves 20b provided on the inner peripheral portion of the inner cam cylinder 20, and is guided by the third group guide groove 21d of the rectilinear cylinder 21, so that the shutter The unit 32 is supported so as to be able to advance and retract in the optical axis direction.

  Next, an image blur correction apparatus incorporated in the lens barrel 100 will be described.

  FIG. 4 is a perspective view of the image blur correction apparatus according to the embodiment of the present invention. FIG. 4A is a perspective view of the image blur correction device as viewed from the front side, and FIG. 4B is a perspective view of the image blur correction device as viewed from the back side (image forming surface side). FIG. 5 is an exploded perspective view of the image blur correction apparatus.

  The image blur correction device includes the third group lenses 2a and 2b, the third group holder 3, the holder torsion spring 4, the holder shaft 5, the third group lever 6, the third group frame 8, the third group base plate 9 and the like shown in FIGS. Have The third group lenses 2a and 2b correspond to an example of an optical member for correcting image blur in the present invention, the third group holder 3 corresponds to an example of a holding member in the present invention, and the holder torsion spring 4 It corresponds to an example of an urging member in the invention. The holder shaft 5 corresponds to an example of a rotating shaft in the present invention, the third group lever 6 corresponds to an example of a retracting drive member in the present invention, and the third group frame 8 corresponds to an example of a frame member in the present invention. The third group base plate 9 corresponds to an example of the fixing member in the present invention.

  FIG. 6 is a front view showing a state in which the third group flexible substrate 11 and the hall sensor holder 12 are removed from the image blur correction apparatus. FIG. 6A shows the case where the third group holder 3 is in the photographing position, and FIG. 6B shows the case where the third group holder 3 is in the retracted position. FIG. 7 is a perspective view showing the relationship among the third group holder 3, the third group frame 8, and the third group lever 6 as seen from the back side. FIG. 7A shows the case where the third group holder 3 is in the photographing position, and FIG. 7B shows the case where the third group holder 3 is in the retracted position. FIG. 8 is a side view of the image blur correction apparatus, and the left side in the figure indicates the subject side. FIG. 9 is a cross-sectional view taken along line AA shown in FIG.

  FIG. 9A shows the case where the third group holder 3 is in the photographing position, and FIG. 9B shows the case where the third group holder 3 is in the retracted position. FIG. 10 is a cross-sectional view taken along the line BB in FIG. FIG. 10A shows the case where the third group holder 3 is in the photographing position, and FIG. 10B shows the case where the third group holder 3 is in the retracted position. FIG. 11 is a front view including the holder shaft 5 and the lever shaft 7 when the third group holder 3 is in the photographing position. FIG. 12 is a cross-sectional view taken along the line CC shown in FIG. 11, and is a cross-sectional view passing through the holder shaft 5 and the lever shaft 7.

  The third group lens 3 holds the third group lenses 2a and 2b (see FIG. 5). The third group holder 3 includes a stopper portion 3a (see FIG. 9), a sleeve 3b (see FIG. 12) parallel to the optical axis, a retracting contact surface 3c (see FIGS. 7 (a) and 10), An anti-vibration interference avoidance space 3d (see FIG. 10A) is formed.

  A third group mask 17a (see FIG. 6) is integrally attached to the subject side of the third group holder 3, and a third group mask 17b (see FIG. 7) is attached to the imaging surface side of the third group holder 3. It is attached integrally.

  The third group frame 8 includes a bearing 8a (see FIG. 12) that supports the holder shaft 5 and three ball receiving surface portions 8b (see FIG. 7) that abut each of the three balls 13 (see FIGS. 5 and 10). And three spring hooks 8c on which one ends of the three thrust springs 14 are hooked. Further, the third group frame 8 is provided with a pair of magnets 8d that are spaced apart from each other by 90 ° in a circumferential direction within a plane orthogonal to the optical axis, and a stopper portion 3a (see FIG. 9) of the third group holder 3. Abutting contact surface 8e (see FIGS. 7B and 9) and mechanical ends 8g and 8h (see FIGS. 7 and 9) for restricting the movement range of the third group frame 8 are formed.

  The holder shaft 5 is press-fitted into the sleeve 3b of the third group holder 3 in parallel with the optical axis. The third group holder 3 holding the third group lenses 2a and 2b is supported by the bearing 8a of the third group frame 8 via the holder shaft 5 so as to be rotatable between the photographing position and the retracted position. It moves integrally with the group frame 8 in a plane perpendicular to the optical axis.

  The holder torsion spring 4 (see FIGS. 5 and 9) is extrapolated to the sleeve 3b (see FIG. 12) of the third group holder 3. The holder torsion spring 4 includes a torsion spring portion and a compression spring portion. With the torsion spring portion of the holder torsion spring 4, the third group holder 3 is attached to the third group frame 8 so that the stopper portion 3 a (see FIG. 9) of the third group holder 3 contacts the contact surface 8 e of the third group frame 8. Energize. That is, the third group lenses 2a and 2b are urged in a direction to move from the retracted position to the photographing position. Further, the compression spring portion of the holder torsion spring 4 urges the third group holder 3 toward the subject in the optical axis direction, and the subject side tip of the sleeve 3b (see FIG. 12) of the third group holder 3 is attached to the third group frame 8. It is brought into contact with the bearing 8a on the subject side.

  The third group base plate 9 is provided with a ball groove 9a (see FIG. 10) and three spring hooks 9b (see FIG. 10) on which the other ends of the three thrust springs 14 are hooked. The three balls 13 are held between the ball receiving surface portion 8b of the third group frame 8 and the ball groove 9a (see FIG. 10) of the third group base plate 9 by the urging force of the thrust spring 14, respectively. It is stored so that it can roll in a plane perpendicular to it. The third group base plate 9 further includes a bearing 9d (see FIG. 12) that supports the third group lever shaft 7 in parallel with the optical axis, and a follower that engages with the cam groove 20a (see FIG. 3) of the inner cam cylinder 20. 9e (see FIGS. 3 and 4), a photographing position contact surface 9f (see FIG. 10) of the third group lever 6, and mechanical ends 9g and 9h (see FIG. 9) for restricting the movement range of the third group frame 8. A through hole 9i (see FIGS. 16 and 17) is provided.

  The third group base plate 9 is provided with a pair of coils 9c (see FIGS. 5 and 10) arranged in the same phase as the pair of magnets 8d. When the pair of coils 9c are energized, Lorentz force is generated between the pair of magnets 8d. By this Lorentz force, the mechanical ends 8g and 8h (see FIGS. 7 and 9) of the third group frame 8 abut on the mechanical ends 9g and 9h (see FIG. 9) of the third group base plate 9 in a plane orthogonal to the optical axis. In the range, the third group frame 8 is supported to be movable relative to the third group base plate 9.

  A pair of Hall elements 10 (see FIG. 5) is mounted on the third group flexible substrate 11. The pair of Hall elements 10 are disposed at positions facing the pair of magnets 8d in the optical axis direction, and are held by the Hall sensor holder 12 (see FIGS. 4 and 5). The hall sensor holder 12 is fixed to the third group base plate 9. The hall element 10 detects a change in the direction and size of the magnetic force of the pair of magnets 8d, and a control unit (not shown) provided in the camera body 101 based on the detection result causes the third group frame with respect to the hall sensor holder 12 to move. The position of 8 is obtained.

  At that time, the control unit controls the voltage applied to the pair of coils 9c based on image blur information of a gyro sensor (not shown) provided in the camera body 101, and the third group frame in a plane orthogonal to the optical axis. Move 8 Thus, by moving the third group holder 3 holding the third group lenses 2a and 2b in the direction of correcting the image blur, image blur due to vibration such as camera shake of the subject image formed on the image sensor 36 through the photographing optical system. By correcting, it is possible to obtain an image or video without image blur.

  The third group lever 6 has a fitting hole 6a (see FIGS. 7 and 12) that fits with the third group lever shaft 7 and a retracting contact portion 6b that contacts the retracting contact surface 3c of the third group holder 3 (see FIG. 7). 7 (a), see FIG. 10). Further, the third group lever 6 includes a retreat slope portion 6c (see FIGS. 7 and 14) that contacts the retreat introduction surface 21e (see FIG. 14) of the rectilinear cylinder 21, and a retreat completion surface 21f (FIG. 14) of the rectilinear cylinder 21. 6d (see FIG. 7 and FIG. 14) is provided.

  The third group lever 6 is supported by a bearing 9d (see FIG. 12) of the third group base plate 9 so as to be rotatable about the third group lever shaft 7. The third group lever 6 is moved toward the photographing position by a lever torsion spring 18 (see FIGS. 5 and 12) attached around the third group lever shaft 7. (See FIG. 10).

  The arrangement of the image blur correction device inside the lens barrel 100 will be described. On the outer peripheral portion of the third group base plate 9, followers 9e (see FIGS. 3 and 4) are provided at three locations at substantially equal intervals in the circumferential direction. These three followers 9e are respectively engaged with three cam grooves 20a (see FIG. 3) formed in the inner peripheral portion of the inner cam cylinder 20, and are guided by the third group guide groove 21d of the rectilinear cylinder 21. . As a result, the third group base plate 9 is supported so as to be able to advance and retreat in the optical axis direction with respect to the inner cam cylinder 20 and the rectilinear cylinder 21, and as a result, the image blur correction device is supported so as to be able to advance and retract in the optical axis direction.

  An example of the operation of the image blur correction apparatus when the lens barrel 100 is retracted from the photographing position to the retracted position will be described mainly with reference to FIGS.

  FIG. 13 is a front view including the image blur correction device and the rectilinear cylinder 21. FIG. 14 is a sectional view taken along the line DD shown in FIG. 13 and shows the relationship between the rectilinear cylinder 21 and the third group lever 6. FIG. 14A is a cross-sectional view when the lens barrel 100 is at the photographing position. FIG. 14B is a cross-sectional view when the lens barrel 100 is at an intermediate position between the photographing position and the retracted position. FIG. 14C is a cross-sectional view when the lens barrel 100 is in the retracted position. In FIG. 14, the right side in the figure indicates the subject side.

  When the lens barrel 100 is at the photographing position shown in FIG. 14A, the third group holder 3 that holds the third group lenses 2a and 2b is disposed at the photographing position on the optical axis of the lens barrel 100 (FIG. 7 (a) and FIG. 9 (a)). At this time, the third group lever 6 is held in an anti-vibration interference avoidance space 3d (see FIG. 10A) in which the retreat contact portion 6b does not contact the retreat contact surface 3c of the third group holder 3. As a result, during the image blur correction operation, the third group holder 3 can translate in a plane perpendicular to the optical axis integrally with the third group frame 8.

  As shown in FIG. 14B, when the lens barrel 100 starts to be retracted from the photographing position to the retracted position, the inner cam cylinder 20 rotates and is provided at three locations on the outer peripheral portion of the third group base plate 9. The follower 9e moves along the cam groove 20a in a direction approaching the rectilinear cylinder 21. With this operation, when the retreat slope 6c of the third group lever 6 contacts the retraction introduction surface 21e of the rectilinear cylinder 21, the third group lever 6 is centered on the third group lever shaft 7 against the biasing force of the lever torsion spring 18. And the retracting contact portion 6b contacts the retracting contact surface 3c of the third group holder 3. Further, by the rotation of the third group lever 6, the third group holder 3 moves outside the optical axis against the urging force of the holder torsion spring 4.

When the lens barrel 100 is in the retracted position shown in FIG. 14C, the third group base plate 9 is along the optical axis until the retreat completion portion 6d of the third group lever 6 contacts the retreat completion surface 21f of the rectilinear cylinder 21. As a result, the third group holder 3 moves to the retracted position.
The operation of the image blur correction apparatus when the lens barrel 100 is extended from the retracted position to the photographing position is changed from the state of FIG. 14C to the state of FIG. 14A through the state of FIG. 14B. Follow the reverse.

  In the lens barrel 100, when the third group holder 3 is moved to the retracted position outside the optical axis when retracted, the fourth group lens 27 is placed in the space where the third group holder 3 in the third group frame 8 is disposed at the photographing position. And the fifth group lens 29 are housed (see FIG. 3B). Thereby, it is possible to reduce the thickness in the optical axis direction when the lens barrel 100 is retracted.

  Next, the arrangement of the third group frame 8 and the third group lever 6 will be described with reference to FIGS. 10 and 15 to 18.

  FIG. 15 is a rear view showing the relationship between the third group frame 8 and the travel area of the third group lever 6. FIG. 16 is a cross-sectional view of the lens barrel 100 including the holder shaft 5 and the optical axis. FIG. 17 is a rear view showing the relationship between the third group frame 8 and the third group base plate 9. FIG. 18 is a perspective view of the fourth group holder 28 as viewed from the front side.

  As described above, at the photographing position, the retreat contact portion 6b of the third group lever 6 is held in the vibration avoidance interference avoidance space 3d that does not contact the retreat contact surface 3c of the third group holder 3 (FIG. 10A). reference). On the other hand, in the retracted position, the retracting contact portion 6b contacts the retracting contact surface 3c of the third group holder 3 (see FIG. 10B). From the above, the traveling region 6e of the third group lever 6 that reciprocates between the photographing position and the retracted position is shown as a hatched portion in FIG.

  In this embodiment, the travel region 6e of the third group lever 6 and the bearing 8a of the third group frame 8 are formed so as not to overlap in the direction perpendicular to the optical axis. In the present embodiment, the travel region 6e of the third group lever 6 and the holder torsion spring 4 are also formed so as not to overlap in the direction perpendicular to the optical axis. Since the holder torsion spring 4 is externally attached to the sleeve 3b of the third group holder 3, the travel region 6e of the third group lever 6 and the sleeve 3b of the third group holder 3 do not overlap in the direction perpendicular to the optical axis. . Further, since the holder shaft 5 is press-fitted into the sleeve 3b of the third group holder 3, the traveling region 6e of the third group lever 6 and the holder shaft 5 do not overlap in the direction perpendicular to the optical axis.

  With the above configuration, as shown in FIG. 16, the holder shaft 5 can be disposed so as to overlap the third group lever 6 in the direction parallel to the optical axis, and the sleeve 3 b of the third group holder 3 is also 3 It can be arranged so as to overlap the group lever 6. As a result, the overall length X of the sleeve 3b is lengthened.

  In the present embodiment, a through hole 9i is provided in the third group base plate 9, and the holder shaft 5 is allowed to enter, so that the total length X of the sleeve 3b can be further increased. Further, in this embodiment, the groove portion 28a is provided in the fourth group holder 28, the holder shaft 5 is inserted, and the length X of the sleeve 3b of the third group holder 3 can be further increased. In the present embodiment, the groove portion is formed in consideration of the strength of the fourth group holder 28, but the full length X of the sleeve 3b of the third group holder 3 may be further increased as a through hole. In this case, the sensor holder 30 disposed on the back surface of the fourth group holder 28 may be provided with a groove or a through hole so that the total length X of the sleeve 3b of the third group holder 3 is further increased.

  As described above, the travel area 6e of the third group lever 6 and the bearing 8a of the third group frame 8 are formed so as not to overlap each other in the direction perpendicular to the optical axis. The shaft 5 is lengthened to increase the total length X of the sleeve 3b of the third group holder 3 in the optical axis direction. By increasing the total length X of the sleeve 3b of the third group holder 3 in the optical axis direction, even when the hole positions at both ends of the sleeve 3b in the optical axis direction are shifted in the direction perpendicular to the optical axis, the inclination of the holder member with respect to the optical axis The amount can be suppressed, and the positional accuracy of the third group lenses 2a and 2b can be increased.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to said embodiment, A material, a shape, a dimension, a form, a number, an arrangement | positioning location, etc. are the range which does not deviate from the summary of this invention. In FIG.

  In the above embodiment, the image blur correction apparatus according to the present invention is applied to a digital camera which is an example of an optical apparatus. However, the present invention is not limited to this. That is, the image blur correction device according to the present invention can be applied to various optical devices such as an imaging device such as a digital video camera, an interchangeable lens for a digital single lens reflex camera, a binocular, a telescope, or an observation device such as a field scope. .

2a, 2b 3 group lens, 3 3 group holder, 3b sleeve,
4 Holder torsion spring, 5 Holder shaft, 6 3rd group lever, 6e Traveling area,
8 Group 3 frame, 8a bearing, 9 Group 3 base plate, 9i through hole, 28 Group 4 holder,
28a Groove, 100 Lens barrel

Claims (6)

A fixing member (9), optical members (2a, 2b),
A holding member (3) for holding the optical member;
A frame member (8) that is supported by the fixing member and corrects image blur of a subject image formed on an imaging element through a photographing optical system including the optical member by moving in parallel in a plane perpendicular to the optical axis; ,
The holding member is pivotally supported on the frame member, and the holding member is moved with respect to the frame member between a photographing position where the optical member is located on the optical axis and a retracted position where the optical member is retracted from the optical axis. A rotation shaft (5) capable of rotating in a plane orthogonal to the shaft;
A biasing member (4) for biasing the holding member toward the photographing position;
A retraction drive member (6) that is rotatably held by the fixing member and moves the holding member from the photographing position to the retraction position against the urging force of the urging member;
The travel range (6e) in which the retracting drive member travels from the photographing position to the retracted position does not overlap with the rotation axis in a plane perpendicular to the optical axis,
The lens barrel (100), wherein the retracting drive member and the rotation shaft overlap in a direction parallel to the optical axis. The frame member (8) has a bearing portion (8a) that holds both ends of the rotating shaft (5),
2. The lens mirror according to claim 1, wherein a travel range (6 e) in which the retraction driving member (6) travels from the photographing position to the retraction position and a bearing portion of the frame member do not overlap in a plane perpendicular to the optical axis. Tube (100). The holding member (3) has a sleeve (3b) for holding the rotating shaft (5),
The lens barrel according to claim 1, wherein the retraction driving member (6) travels from the photographing position to the retraction position, and the sleeve of the holding member does not overlap in a plane perpendicular to the optical axis. (100). The biasing member (4) is formed on the outer peripheral portion of the sleeve (3b) of the holding member (3),
The lens barrel (3) according to claim 3, characterized in that the retreat drive member (6) travels from the photographing position to the retreat position and the urging member does not overlap in a plane perpendicular to the optical axis. 100). The fixing member (9) has a notch (9i) in the optical axis direction,
The lens barrel (100) according to any one of claims 1 to 4, wherein the rotation shaft (5) and the cutout portion of the fixing member overlap in a direction parallel to the optical axis. A second holding member (28) adjacent to the fixing member (9) in the optical axis direction and having a notch (28a) in the optical axis direction;
The lens barrel (100) according to claim 5, wherein the rotation shaft (5) and the cutout portion of the second holding member overlap in a direction parallel to the optical axis.