JP5498055B2 - Lens barrel and imaging device - Google Patents

Description

  The present invention relates to a retractable lens barrel and an imaging apparatus to which the lens barrel is applied.

  Conventionally, the lens barrel disclosed in Patent Document 1 as a lens barrel that can be miniaturized reduces the manufacturing cost, shortens the lens optical axis direction in the retracted state, and improves the impact resistance. It has been proposed to make it possible.

  As shown in the retracted sectional view of FIG. 23, the conventional lens barrel 113 mainly includes a master flange 110 fixed to the camera exterior, a zoom motor fixed to the master flange 110, and each frame. Is fixed to the master flange 110, a drive frame 130 driven by the driving force of the zoom motor, and a cam frame 140 supported by the fixed frame 120 so as to be movable in the optical axis O direction of the photographing lens. A rotating cam frame 170 that rotates together with the drive frame 130, a rectilinear frame 180 that moves in the direction of the optical axis O without rotating with respect to the fixed frame 120, and a shutter unit 194.

  The imaging optical system of the lens barrel 113 includes a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, and a fifth lens group G5 to which the fixed frame 120 is fixed. Consists of. The first lens group G1 is a three-lens lens group having a positive power as a whole. The second lens group G2 is a lens group having negative power as a whole. The zoom magnification of the imaging optical system can be adjusted by the first lens group G1 and the second lens group G2. The third lens group G3 is a lens group for correcting image shake (image shake) caused by camera movement. The fourth lens group G4 is a positive power lens group for adjusting the focal point. The fifth lens group G5 is a positive power lens.

  The drive frame 130 and the rotating cam frame 170 can rotate with respect to the fixed frame 120 and can move in the direction of the optical axis O, but other members do not rotate with respect to the fixed frame 120 in the Y-axis direction. Moving. A CCD unit 115 is attached to the master flange 110.

  When the lens barrel 113 is in the retracted state, as shown in FIG. 23, the drive frame 130, the cam frame 140, the rotating cam frame 170, and the lens holding frames are moved in the optical axis O direction with respect to the fixed frame 120. In this state, the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 are retracted to positions that are very close to each other. As a result, the lens barrel 113 in the retracted state can be reduced in size in the direction of the optical axis O, and can be reduced in size.

JP 2008-185786 A

  However, in the lens barrel 113 disclosed in Patent Document 1, when in the retracted state, as described above, the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 are included. Each of the structural frame members is inevitably moved to close positions, but variations in manufacturing dimensions or variations in shape are inevitable. Accordingly, the retraction positions of the structural frame members are limited to the retraction positions with allowances in consideration of the variation, and the length in the optical axis O direction in the retracted state of the lens barrel is sufficiently shortened. I can't hope.

  Further, in the above-described photographing optical system of the lens barrel 113, the presence of the positive power fifth lens group G5 makes it easy to make the light incident on the imaging surface of the CCD closer to the vertical, and the peripheral portion of the photographing screen is turned off. It has the merit that it is easy to prevent so-called shading. However, it is disadvantageous for thinning the zoom lens when retracted. That is, in order to retract the zoom lens, even if the fourth lens group G4 is brought closer to the CCD, the amount of movement of the fourth lens group G4 is limited by interference with the fifth lens group G5. In addition, since the fifth lens group G5 has a positive power, it becomes difficult for the fourth lens group G4 to have a sufficiently large positive power. For this reason, when the fourth lens group G4 is moved for focusing or zooming, the amount of movement of the fourth lens group G4 is increased in order to make the fourth lens group G4 have a sufficient function. For example, the mechanism for moving the fourth lens group G4 becomes large, such as an increase in the length of a shaft provided with a thread for moving the fourth lens group G4, which is also disadvantageous for thinning when retracted. In addition, the first lens group G1 has three lenses, which is disadvantageous for reducing the thickness of the retracted lens barrel 113.

  The present invention has been made to solve the above-described problems, and a lens barrel capable of shortening the length in the optical axis direction of the photographing lens in the retracted state, and an imaging apparatus to which the lens barrel is applied The purpose is to provide.

In order to solve the above problems, a lens barrel of the present invention is a retractable lens barrel, wherein a plurality of lens groups and a photographing optical system having an optical axis composed of the lens groups, a fixed frame member, and the lens groups are provided. A first cam groove and a second cam groove that are inclined with respect to the optical axis, and a cam frame member that is driven to move forward and backward relative to the fixed frame member; Of the lens groups, the first lens group that holds the frontmost first lens group and has a first cam follower that slidably fits in the first cam groove, and the cam frame in a rotationally restricted state. A first frame member that is driven forward and backward by the member via the first cam follower, and a second lens group on the rear side of the first lens group among the plurality of lens groups; A second cam follower that is slidably fitted in the second cam groove. A second frame member which is driven forward and backward through the second cam follower by the cam frame member while being restricted, among the plurality of lens groups, the second lens group of the rear side of the third lens A third frame member that holds the group and is supported in a state in which the rotation is restricted, and is driven forward and backward, and is interposed between the second frame member and the third frame member, the frame member being a lens An urging member that urges in a direction away from the group optical axis direction, and the second cam groove is located with respect to the second cam follower when the cam frame member is in a photographing position. It has a cam groove shape that is in a fitting state with a small gap in the lens group optical axis direction, and has a large gap in the lens group optical axis direction when the cam frame member is in the retracted rotation position. The lens barrel is in a retracted state, and the first frame member and the second frame If the the member in contact, the second cam follower is movable to the space of said second cam groove in the retraction direction and, at the rear side of the third lens group, by the third frame member A shutter / aperture unit supported so as to be capable of moving back and forth in the lens group optical axis direction; a compression spring for biasing the third frame member and the shutter / aperture unit in a direction away from the lens group optical axis direction; A fourth frame member that holds a fourth lens group made up of a single lens having a positive refractive power as a focus lens group on the rear side of the third lens group. When the lens barrel is in the retracted state, the third frame member and the shutter / aperture unit are separated from each other by a predetermined distance in the lens group optical axis direction. When the lens barrel is in the retracted state, , The shutter The third frame member is driven until the shutter blade and the diaphragm blade of the diaphragm unit are driven to the open position and the compression spring is compressed and the third lens group enters the opening of the shutter / diaphragm unit. And the shutter / aperture unit are close to each other.

  The imaging apparatus according to the present invention includes a lens barrel, a base member fixedly supported by the fixed frame member, and a surface orthogonal to the optical axis of the imaging optical system on the base member to perform camera shake correction. And an image sensor for converting the subject image electrical signal imaged by the imaging optical system, and driving the image sensor on a plane orthogonal to the optical axis of the imaging optical system. Imaging element displacement drive actuator.

  According to the present invention, it is possible to provide a lens barrel capable of shortening the length in the optical axis direction of the photographing lens in the retracted state, and an imaging device to which the lens barrel is applied.

1 is an exploded perspective view showing a part of a lens barrel in an imaging apparatus according to an embodiment of the present invention. 1 is an exploded perspective view showing another part of the lens barrel of FIG. 1 is an exploded perspective view of a third group frame and a shutter unit in the lens barrel of FIG. FIG. 2 is an exploded perspective view of a fixed frame, a fourth group frame, and a focus drive unit in the lens barrel of FIG. 1. 1 is a perspective view of a blur correction imaging unit in the lens barrel of FIG. 1 is a longitudinal sectional view including the lens optical axis in the retracted state of the lens barrel of FIG. 1 is a longitudinal sectional view including the lens optical axis in a wide state where the lens barrel of FIG. 1 can be photographed. 1 is a longitudinal sectional view including a lens optical axis in a telephoto state where the lens barrel of FIG. 1 can be photographed. 1 is a cross-sectional view including the lens optical axis in the retracted state of the lens barrel in FIG. Front view of the lens barrel of FIG. Rear view of the lens barrel of FIG. FIG. 7 is a cross-sectional view taken along the line XII-XII in FIG. 6, and shows the fourth group frame, the focus drive unit, and the zoom drive unit as viewed from the back side. 1 is a plan view of the lens barrel in FIG. 1 in the retracted state. The bottom view in the retracted state of the lens barrel of FIG. The right side view in the retracted state of the lens barrel of FIG. The left side view in the retracted state of the lens barrel of FIG. FIG. 2 is a partial cross-sectional view of the lens barrel of FIG. 1 viewed from the left in a retracted state, particularly showing a cross-section of the focus drive unit. 2 is a perspective view of a conical coil spring for urging the second and third group frames applied to the lens barrel of FIG. The front view which looked at the conical coil spring of FIG. 18 from the large diameter side 1. Cam groove development view of the inner periphery of the cam frame applied to the lens barrel of FIG. It is XXI-XXI sectional drawing of FIG. 20, Comprising: The figure which shows the fitting state with respect to the cam follower of the cam groove for 2 group frames at the time of a photography possible state FIG. 21 is a cross-sectional view taken along the line XXII-XXII in FIG. 20, showing a fitting state of the cam groove for the second group frame with the cam follower when in the retracted state. A longitudinal sectional view including the lens optical axis of a conventional lens barrel

  A lens barrel serving as an imaging apparatus according to an embodiment of the present invention will be described with reference to FIGS.

  The lens barrel 1 of the present embodiment includes a photographing optical system having a first group lens having a positive refractive power, a second group lens having a negative refractive power, a third group lens having a positive refractive power, and a fourth group lens having a positive refractive power. A retractable lens barrel in which each movable lens barrel member is retracted in a non-photographing state, and further has an image blur correction function including an image sensor that can move to the imaging plane of the optical system It can be built in a digital camera as an imaging device.

  In the following description, the photographic lens optical axis of the imaging optical system is indicated by “O”. Among the optical axis O directions, the subject side direction is defined as the front, and the imaging side direction is defined as the rear. Further, it is a direction orthogonal to the optical axis O, and when viewed from the front side, the left-right direction is the X direction, and particularly the right direction is the + X side. It is a direction orthogonal to the optical axis O, and the vertical direction is the Y direction, and in particular, the upward direction is the + Y side. A plane orthogonal to the optical axis O is defined as an XY plane.

  When the lens barrel 1 is in the retracted state, as shown in FIG. 6, each movable frame member is retracted to the fixed frame 13 side, which will be described later, and close to each other, and the entire length of the lens barrel is shortened. It is in the state that was done. On the other hand, when the lens barrel 1 is in a zoom wide state and a zoom telephoto state in which photographing is possible, as shown in FIGS. 7 and 8, each movable frame member is extended forward in the optical axis O direction, and a group frame 4 described later. Then, the cam frame 5, the rotating frame 11 and the like are in a protruding state. Further, in the lens barrel 1, an imaging device 96 described later is supported so as to be movable on an XY plane orthogonal to the optical axis O, and based on a camera shake detection signal detected on the digital camera side during shooting, The image sensor 96 is displacement controlled on the XY plane so as to correct the camera shake.

  1 and 2, the main constituent members of the lens barrel 1 are sequentially arranged from the front side in the optical axis O direction, and include a barrier unit 3 for opening and closing a front surface portion of a group lens 21 described later, and a group. The first group frame 4 that is the first frame member that holds the lens 21, the second group frame 6 that is the second frame member that holds the second group lens 22, and the first group frame 4 and the second group frame 6 are driven forward and backward. A cam frame 5 which is a cam frame member, a shutter / diaphragm unit 8 on the rear side, a third group frame 7 which is a third frame member holding the third group lens 23, and the rotation of the first and second group frames. The float key 9 and the cam frame 5 which are frame members for restricting the movement, and the forward and backward drive of the cam frame 5, the rotation of the third group frame 7 and the flow key 9 is restricted, and the moving frame 10 and the cam frame 5 are rotationally driven. Further, the rotary frame 11 for driving the third group frame 7 forward and backward and the fourth group lens 24 are held. The fourth group frame 12 that is the focus lens holding frame and the fixed frame 13 that supports the rotary frame 11 so as to be able to rotate forward and backward and restricts the rotation of the movable frame 10 and is fixedly held on the camera body side. And a zoom drive unit 50 for rotating the rotary frame 11, a focus drive unit 60 for driving the fourth group frame 12 forward and backward, and a base plate 14 which is a base member fixedly supported on the camera body side. 96, and a shake correction imaging unit 90 for driving the imaging device 96 on a plane orthogonal to the optical axis O direction.

  The fixed frame 13 has a cylindrical portion, accommodates each frame member in the inner peripheral portion, and the base plate 14 of the shake correction imaging unit 90 is fixed to the back surface portion. The fixed frame 13 includes a rotating frame cam groove 13a that is inclined with respect to the optical axis O direction along the inner periphery of the cylinder, a linear guide groove 13c for the moving frame along the optical axis O direction, and a fourth group frame. A rectilinear guide groove 13b and a gear storage recess 13d in which a long gear 54 described later is stored are provided. In addition, a zoom drive unit 50 is disposed along the right side of the outer periphery of the cylinder, and a focus drive unit 60 is disposed on the upper left of the outer periphery of the cylinder. A light shielding ring 35 is fixed to the front surface portion.

  The rotating frame 11 is a cylindrical frame member, and is inserted into the inner peripheral portion of the fixed frame 13 so that the outer periphery of the rear end portion can rotate and retreat. A cam follower 11 b is arranged on the outer periphery of the rear end portion, and is slidably fitted into the cam groove 13 a of the fixed frame 13. A gear portion 11 a that meshes with the long gear 54 is provided in a predetermined range on the outer periphery of the rear end portion. A third group frame cam groove 11c and a cam frame rectilinear groove 11d which are inclined with respect to the optical axis O direction are provided on the inner peripheral portion of the rotary frame 11.

  When the rotary frame 11 is rotationally driven by the rotation of a long gear driven by the zoom drive unit 50, the rotary frame 11 is driven to advance and retreat in the optical axis O direction while rotating along the cam groove 13a. A light shielding ring 34 and a decorative ring 33 are mounted on the outer periphery of the front surface of the rotary frame 11.

  The moving frame 10 is a cylindrical frame member, the rear end portion of which is bayonet-coupled to the rotating frame 11, is moved forward and backward in the optical axis O direction with respect to the rotating frame 11, and is supported so as to be relatively rotatable. Has been. Further, a guide pin 10 b that protrudes to the outer periphery of the rear end portion is engaged with the rectilinear guide groove 13 c of the fixed frame 13. Therefore, the moving frame 10 advances and retreats together with the rotating frame 11 under the rotation restricted state.

  A cam frame cam groove 10c that penetrates the inner and outer peripheries of the movable frame 10 and obliquely moves with respect to the optical axis O, a third group frame rectilinear guide groove 10e that penetrates the inner and outer peripheries, and an inner peripheral portion Is provided with a straight guide groove 10f for a float key.

  The float key 9 is a cylindrical frame member, the rear end portion of the cam frame 5 is bayonet-coupled, moves forward and backward in the direction of the optical axis O with respect to the cam frame 5, and is relatively rotatable. It is supported by. The float key 9 is provided with a guide projection 9a projecting to the outer periphery of the rear end portion, a first-group frame rectilinear guide groove 9c on the outer peripheral portion, and a second-group frame rectilinear guide groove 9b penetrating the inner and outer peripheries.

  The guide protrusion 9 a of the float key 9 is slidably fitted into the straight guide groove 10 f of the moving frame 10. Accordingly, the float key 9 is supported so as to be movable back and forth in the direction of the optical axis O together with the cam frame 5 under a state in which the rotation is restricted by the moving frame 10.

  The cam frame 5 is a cylindrical frame member that is fitted into the inner peripheral portion of the moving frame 10 and is incorporated so as to be capable of rotating forward and backward. The cam frame 5 is provided with a cam follower 5d that protrudes from the rear outer peripheral portion, and is fitted and fixed to the center of the cam follower 5d in a state in which the linear guide pin 38 protrudes outward. The inner peripheral portion is provided with three pairs of one-group frame cam grooves 5a, sub-cam grooves 5b, and three second-group frame cam grooves 5c having the same cam curve (cam groove center locus) (FIG. 20). ). In the cam frame development view of FIG. 20, θ represents a relative rotation angle with respect to the first group frame 4 and the second group frame 6 of the cam frame 5, and the (+) direction represents the feeding rotation direction from the retracted state. The-) direction indicates the retraction rotation direction to the retracted state.

  Cam followers 36 and 37 of the first group frame 4 to be described later are fitted into the pair of first group frame cam groove 5a and sub cam groove 5b, respectively, and the cam groove 5a side functions as an advance / retreat drive for the first group frame 4. The groove 5b side functions to prevent the cam follower from coming off when an external force in the thrust direction is applied to the first group frame 4 due to an impact or the like. As shown in FIG. 20, when the cam frame 5 rotates, the cam follower 36 moves relative to the cam groove 5a from the retracted cam follower 36C through the wide cam follower 36W to the tele cam cam follower. Move to position 36T. Similarly, the cam follower 37 relatively moves with respect to the sub cam groove 5b from the retracted cam follower 37C to the tele cam cam follower 37T via the wide cam follower 37W.

  The second group frame cam groove 5c includes a cam groove 5ca and a cam groove 5cb having different groove widths communicating with each other. When the lens barrel 1 is in the photographing state as shown in FIG. 21, which is a cross-sectional view taken along the XXI-XXI line in FIG. 20, the cam groove 5ca of the cam grooves 5c is the cam follower 39W in the wide state of the second group frame 6 described later. Is inserted into the tele-cam follower 39T without any gap. On the other hand, when the lens barrel 1 is in the retracted state as shown in FIG. 22 which is a XXII-XXII sectional view of FIG. 20, the cam groove 5cb of the cam grooves 5c is in the retracted state of the second group frame 6 described later. The cam follower 39C is fitted with a predetermined gap.

  The cam follower 5d is slidably fitted into the cam groove 10c of the moving frame 10, and the rectilinear guide pin 38 is slidably fitted into the rectilinear groove 11d of the rotating frame 11 after being inserted through the cam groove 10c (FIG. 9). . Accordingly, the cam frame 5 is supported so as to be movable back and forth in the direction of the optical axis O along the cam groove 10 c of the moving frame 10 while rotating together with the rotating frame 11.

  In the telephoto state as shown in FIG. 8, when the cam frame 5 is extended with the rotating frame 11, the cam follower 5 d is located near the thin portion 10 d on the front side of the cam groove 10 c of the moving frame 10. It is moving (Fig. 1). If an external force (tensile force) in the forward direction is applied to the group frame 4 exposed to the outside or the cam frame 5 in this state, a thin-walled portion on the front side of the movable frame 10 via the cam follower 5d. There is a possibility that the external force acts on 10d to break the thin portion 10d. However, in the present embodiment, since the front end surface of the moving frame 10 is in contact with the inner step portion 11e (FIG. 8) of the rotating frame 11 due to the front external force, the thin frame of the moving frame 10 due to the external force is used. Damage to the portion 10d is prevented.

  The barrier unit 3 incorporates four barrier blades 3 a and is attached to the front portion of the group frame 4 while being covered with the decorative ring 2. As the first group frame 4 is retracted from the retracted position, the barrier blade 3a is retracted, and the front surface of the first group lens 21 is opened. Further, as the first group frame 4 is retracted from the photographing position, the barrier blade 3a is advanced to the closed position, and the front surface of the first group lens 21 is closed.

  The first group frame 4 is a cylindrical frame member and is fitted in the inner peripheral portion of the cam frame 5 so as to be able to advance and retreat in a rotation restricted state. The first group frame 4 holds a first group lens 21 as a first lens group, and three pairs of cam followers 36 and 37 are fixed to the outer peripheral portion. Further, a guide protrusion (not shown) that is slidably fitted in the straight guide groove 9c of the float key 9 is provided on the inner peripheral portion.

  The cam followers 36 and 37 of the first group frame 4 are slidably fitted into the cam groove 5a and the sub cam groove 5b of the cam frame 5, respectively, and the first group frame 4 is restricted in rotation by the rectilinear guide groove 9c of the float key 9. In this state, the cam frame 5 moves forward and backward as the cam frame 5 rotates and advances and retracts. Note that the cam follower 37 and the sub cam groove 5b are provided to prevent the cam follower from coming off when an external force due to dropping or the like acts on the group frame 4 as described above.

  The second group frame 6 is a cylindrical frame member. The second group frame 6 is fitted into the inner peripheral portion of the float key 9 so as to be able to advance and retreat in a rotation restricted state, and is incorporated on the rear side of the first group frame 4. The second group frame 6 holds a second group lens 22 which is a second lens group, and has three guide projections 6a on the outer peripheral portion and a cam follower in a state of projecting outward from the center of the guide projection 6a. 39 is fixed.

  The guide protrusion 6 a is fitted into the straight guide groove 9 b of the float key 9 and penetrates therethrough, and the cam follower 39 is fitted into the cam groove 5 c of the cam frame 5. Therefore, the second group frame 6 moves forward and backward under the rotation restricted state by the rotation and forward / backward movement of the cam frame 5.

  The third group frame 7 is a cylindrical frame member, is fitted into the inner peripheral portion of the float key 9, and is incorporated behind the second group frame 6 so as to be able to advance and retreat in a rotation restricted state. The third group frame 7 holds a third group lens 23 which is a third lens group, and supports a shutter / diaphragm unit 8 on the inner peripheral portion on the back side so as to be movable relative to the optical axis O direction. Further, a third group lens pressing plate 7a is fixed to the front side. A guide protrusion 7b is provided on an arm portion protruding outward from the third group frame 7, and a cam follower 41 is fixed to the guide protrusion (FIG. 3).

  The third group frame 7 is assembled by fitting the guide protrusion 7b into the rectilinear guide groove 10e of the moving frame 10 and inserting the cam follower 41 into the cam groove 11c of the rotating frame 11 after passing through. Accordingly, the third group frame 7 moves back and forth in the direction of the optical axis O under the rotation restricted state as the rotating frame 11 rotates.

  The shutter / aperture unit 8 incorporates a shutter blade 25 for opening and closing a photographing optical path and a diaphragm blade 26 for adjusting a photographing light amount. A compression spring 42 is inserted between the shutter / diaphragm unit 8 and the third group frame 7 and is urged away from each other.

  When the lens barrel 1 is ready for photographing, the shutter / aperture unit 8 and the third group frame 7 are separated from each other by a predetermined distance. However, in the retracted state, the compression spring 42 is compressed by the fourth group frame 12 and is substantially in close contact with each other. It becomes a state to do. In the retracted state, the shutter blade 25 and the diaphragm blade 26 are driven to the open position, and the rear portion of the third lens group 23 enters the open opening. As a result, a state closer to the close contact between the shutter / diaphragm unit 8 and the third group frame 7 is obtained. Furthermore, it is in a state of being very close to the fourth group lens 24.

  Between the second group frame 6 and the third group frame 7, a conical coil spring 18 as an urging member for urging the second and third group frames is inserted, and the second group frame 6 and the third group frame 7 are optically connected to each other. It is urged to be separated in the O direction (FIGS. 6 to 8). As described above, since the second group frame 6 and the third group frame 7 are biased so as to be separated from each other, when the lens barrel 1 is ready for photographing, the cam follower 39 and the cam frame of the second group frame 6 5 cam groove 5ca and the cam follower 41 of the third group frame 7 and the cam groove 11c of the rotary frame 11 are respectively fitted together, and the second group frame 6 and the third group frame in the state of no play in the optical axis O direction. 7 forward / backward driving is possible. Further, even in the retracted state, the cam follower 39 of the second group frame 6 is prevented from rattling in the cam groove 5cb where the cam frame 5 is loose.

  The conical coil spring 18 has a shape shown in FIGS. 18 and 19, and a bent portion 18 a that is bent toward the inner diameter side is provided on the large-diameter side end winding portion. When assembled between the second group frame 6 and the third group frame 7, the large-diameter side winding portion is disposed against the end surface side of the second group frame 6. When the lens barrel 1 is retracted into the retracted state, the conical coil spring 18 is compressed and close to the close contact state as shown in FIG. 6, but at this time, because of the bent portion 18a, the large diameter side seat is provided. A state in which the winding adjacent to the winding portion is fitted and not restored is prevented.

  The fourth group frame 12 is arranged behind the shutter / aperture unit 8 so as to be able to advance and retreat in a rotation restricted state. The fourth group frame 12 holds a fourth group lens 24, which is a fourth lens group, in a central opening, and has two arms extending outward. The one arm is provided with a guide projection 12c, and the other arm is provided with a guide shaft hole 12a, a feed screw insertion hole 12b, and a sensor shielding piece 12d.

  A guide shaft 65 supported by the fixed frame 13 is slidably fitted into the guide shaft hole 12a. Further, the guide protrusion 12c is formed to protrude in both widths (circumferential direction) around the optical axis O, and includes two micro cylindrical protrusions extending in the direction parallel to the optical axis O (FIG. 12). The guide groove 13b is slidably fitted. Accordingly, the fourth group frame 12 is supported by the driving force of the focus driving unit 60 described later via the feed screw 66 so as to advance and retreat in the optical axis O direction along the guide shaft 65 and the rectilinear guide groove 13b.

  The guide protrusion 12c is composed of two minute partial cylindrical portions in the width direction as described above.

  Accordingly, even if there is a slight misalignment around the optical axis O due to the dimensional accuracy of the fourth group frame 12, both cylindrical widths of the guide protrusions 12c abut against the rectilinear guide groove 13b of the fixed frame 13, so A good fitting state without any problem is maintained.

  Further, when the center adjustment mechanism of the fourth group lens 24 is applied to the fourth group 12, and for example, when the eccentric adjustment mechanism is incorporated in the guide shaft 65, the guide protrusion 12c is formed by the minute partial cylindrical portion as described above. If this is done, it is possible to maintain a good fitting state between the rectilinear guide groove 13b and the guide projection 12c even when the posture of the fourth group frame 12 is changed by the core adjustment. The guide protrusion 12c is not limited to the minute cylindrical portion, and may be two minute spherical portions that protrude in the width direction.

  As shown in FIGS. 2 and 12, the zoom drive unit 50 is arranged on the right side of the cylindrical outer periphery of the fixed frame 13 (left side in FIG. 12). The zoom drive unit 50 includes a zoom motor 51 composed of a DC motor, a gear case lid 52, and a gear train. 53 and a long gear 54.

  The gear case lid 52 is fixed to the right side of the fixed frame 13 from the back side, and includes a shaft hole portion that supports the shaft portions of the gear train 53 and the long gear 54.

  The zoom motor 51 is supported by the fixed frame 13 and is disposed between an X drive motor 71 and a Y drive motor 81, which will be described later, mounted on the base plate 14, and a worm gear is provided on the output shaft along the Y direction. It is fixed.

  The gear train 53 includes a worm wheel that meshes with the worm gear of the zoom motor 51 and a reduction gear train that meshes with the worm wheel and meshes with the long gear 54.

  The long gear 54 is housed in the gear housing recess 13 d of the fixed frame 13 along the direction parallel to the optical axis O, and meshes with the gear portion 11 a of the rotating frame 11.

  In the zoom drive unit 50, when the zoom motor 51 is rotationally driven during the retracting drive and zoom driving of the lens barrel 1, the rotary frame 11 is rotationally driven via the long gear 54, and the lens barrel 1 is extended or retracted. Is done.

  As described above, the focus drive unit 60 is disposed at the upper left of the outer peripheral portion of the cylinder. As shown in FIGS. 4, 12, and 17, the focus motor 61 including a step motor, a gear case cover 62, a guide shaft 65, and a feed shaft are provided. It comprises a screw 66, a gear train 63, a nut 64, a fourth group frame urging spring 67, and a focus origin detection PI 68 which is an origin detector composed of a photo interrupter.

  The gear case lid 62 is fixed to the upper left part of the fixed frame 13 from the back side, and supports the gear train 63, the guide shaft 65 parallel to the optical axis O, and the shaft end of the feed screw 66.

  The focus motor 61 is supported by the fixed frame 13, and a pinion that meshes with the gear train 63 is attached to an output shaft along a direction parallel to the optical axis O.

  The guide shaft 65 is arranged along a direction parallel to the optical axis O, is slidably fitted into the guide shaft hole 12a of the fourth group frame 12, and its shaft end is supported by the fixed frame 13 and the gear case lid 62. The

  The feed screw 66 is driven by a focus motor 61 through a gear train 63. A nut 64 is screwed into the feed screw 66, and an end surface portion of the feed screw insertion hole 12 b of the fourth group frame 12 is in contact with the rear surface of the nut 64. The nut 64 has a rotation restricting protrusion that is guided by the fixed frame 13 in a rotation restricting state.

  The fourth group frame urging spring 67 is formed of a tension spring, is suspended between the fixed frame 13 and the fourth group frame 12, urges the fourth group frame 12 forward, and feeds a feed screw insertion hole of the fourth group frame 12 to the nut 64. The end face of 12b is contacted.

  The PI 68 is fixed to the fixed frame 13 so that the sensor shielding piece 12d of the fourth group frame 12 can be inserted therethrough. When the camera is turned on, the PI 68 detects passage of the sensor shielding piece 12d of the fourth group frame 12 and the focus origin position information of the fourth group frame 12 is taken into a camera control unit (not shown).

  Note that the rear end portion of the focus drive unit 60 including the gear case lid 62 protrudes rearward from the back surface of the fixed frame 13, and the protruding portion is the upper left on the base plate 14 of the shake correction imaging unit 90 described later. It has entered a notch provided in the third corner 14d of the corner.

  In the focus drive unit 60, when the focus motor 61 is rotationally driven during the focusing drive of the lens barrel 1, the feed screw 66 is rotationally driven, and the nut 64 moves forward and backward. The fourth group frame 12 moves back and forth in the direction of the optical axis O in a state where the end face of the feed screw insertion hole 12b is in contact with the nut 64.

  Here, the first, second, third, and fourth group lenses constituting the photographing optical system of the lens barrel 1 will be described. The first group lens 21 includes a negative meniscus lens 21a having a convex surface facing the subject side in order from the subject side and a biconvex shape. It consists of a cemented lens of the positive lens 21b, and moves to the subject side from the wide end to the tele end. By applying the first group lens 21, it is advantageous for downsizing in the thickness direction and the radial direction, and each lens cancels out aberrations, which is advantageous for correction of various aberrations in the first group lens 21, widening, Aberration fluctuation when the zoom ratio is increased is suppressed.

  The second group lens 22 includes a second group lens front group 22a and second group lens rear groups 22b and 22c in order from the subject side. The second lens group front group 22a is composed of a negative meniscus lens having a convex surface facing the subject, and the second lens group rear groups 22b and 22c are composed of a biconcave negative lens and a positive meniscus lens having a convex surface facing the object. .

  The second group lens 22 is moved from the wide end to the intermediate state with the first group lens 21 and moved toward the image plane while narrowing the distance with the third group lens 23. From the intermediate state to the tele end, Is moved to the subject side while the distance from the third lens group 23 is narrowed. At the tele end, it is located closer to the subject than at the wide end.

  The third group lens 23 includes a third group lens front group 23a and a third group lens rear group 23b in order from the subject side. The third lens group 23a is composed of a biconvex positive lens, and the third lens group rear group 23b is composed of a negative meniscus lens having a convex surface facing the subject. The third group lens 23 moves toward the subject from the wide end to the tele end.

  The fourth group lens 24 is composed of one positive meniscus lens having a convex surface facing the subject side. The fourth group lens 24 is driven back and forth during focusing, and further moves from the wide end to the intermediate state toward the subject side while widening the distance from the third group lens 23, and from the intermediate state to the tele end, Move slightly to the image plane side while widening the interval. At the tele end, it is located closer to the subject than at the wide end.

  By composing the photographing optical system as described above, the combined system of the first group lens 21 and the second group lens 22 approaching in the vicinity of the wide end has a positive refractive power (first group lens 21) and a negative refractive power (in order from the subject side). The second lens group front group 22a) and the positive refracting power (second lens group rear groups 22b and 22c) have a symmetrical power arrangement.

  Also in the composite system of the third group lens 23 and the fourth group lens 24, in order from the subject side, positive refractive power (third group lens front group 23a), negative refractive power (third group lens rear group 23b), positive refractive power ( The symmetric power arrangement of the fourth group lens 24) is obtained.

  In addition, the composite system of the second group lens 22 and the third group lens 23 that are close to each other near the telephoto end has a negative refractive power (second group lens front group 22a) and a positive refractive power (second group lens rear group 22b) in order from the subject side. 22c), a positive refracting power (the third lens group front group 23a), and a negative refracting power (the third lens group rear group 23b).

  Therefore, it is easy to correct Petzval sum, coma aberration, lateral chromatic aberration, and spherical aberration near the wide end, and Petzval sum, coma aberration, and lateral chromatic aberration near the tele end. It becomes easy to do. In addition, the principal point of the third lens group can be more easily set than the subject, and the zoom ratio can be easily secured.

  Furthermore, the fourth group lens 24 is made up of a single positive lens component, which is advantageous in reducing the thickness when the lens barrel is retracted. Since the fourth group lens 24 mainly has a function of separating the exit pupil from the image plane, the positive refractive power can be reduced. Therefore, the above-described configuration is advantageous in reducing the size and cost.

  The blur correction imaging unit 90 includes a movable imaging unit mounted on the back surface of the fixed frame 13, and a base plate 14 that is a base member and a Y supported on the base plate 14 so as to be movable in the Y direction of the XY plane. A frame 15, an X frame 16 supported on the Y frame 15 so as to be movable in the X direction of the XY plane, an image sensor unit 95 fixedly supported on the X frame 16, an X drive unit 70, and a Y drive unit 80.

  The base plate 14 has a central opening 14a, and a first projected portion 14b at the lower right (lower left in FIG. 11) is located at the center of the optical axis O and the upper right (in FIG. 11). A frame member having a substantially rectangular shape having a second corner portion 14c at the upper left, a third corner portion 14d at the upper left (upper right in FIG. 11), and a fourth corner portion 14e at the lower left (lower right in FIG. 11). Thus, it is fixed to the back surface of the fixed frame 13. When the base plate 14 is fixed to the fixed frame 13, it is necessary to accurately position the shake correction imaging unit 90 on the XY plane with respect to the optical axis O on the lens barrel side. The positioning pin holes 14f and 14g (FIG. 11) are fixed in a state where the positioning pin holes 14f and 14g (FIG. 11) are fitted into the positioning pins on the fixed frame 13 side.

  The third corner 14d has a notch, and the rear end of the focus drive unit 60 including the gear case lid 62 enters the notch as described above. The fourth corner portion 14 e is a member disposition relief portion (for example, an arc shape) in a state along the outer periphery of the fixed frame 13. The escape portion serves as an escape portion for arranging a tripod female screw portion of the digital camera to which the lens barrel 1 is attached.

  The Y frame 15 is made of a frame member having an opening 15a, and is arranged in the central opening 14a of the base plate 14, and is biased by a biasing spring in the Y direction by two guide shafts 91 and 92. It is slidably supported.

  The X frame 16 is made of a frame member having an opening 16a, is arranged in the opening 15a of the Y frame 15, and is slid in the X direction by two guide shafts 93 and 94 while being urged by an urging spring. It is supported movably.

  The image sensor unit 95 is fixed to the image sensor support plate 98 while being mounted on an image sensor support plate 98 and an FPC (flexible printed circuit board) 103, and includes an image sensor 96 made of CCD, CMOS, or the like, and an image sensor. 96, an optical low-pass filter disposed on the front side of 96 or an optical filter 97 of an infrared cut absorption filter. A near-infrared sharp cut coat may be directly coated on the surface of the optical low-pass filter.

  The image sensor unit 95 is attached to the X frame 16 with the image sensor support plate 98 fixed to the back side of the X frame 16 with screws, and the image sensor 96 and the optical filter 97 arranged in the opening 16 a of the X frame 16. The

  The X drive unit 70 is assembled to the front side of the upper right first corner 14b of the base plate 14, and is arranged in a state of overlapping the rear position of the gear train 53 of the zoom drive unit 50 on the outer peripheral portion of the fixed frame 13 ( FIG. 10). The X drive unit 70 has an X drive unit support plate 72, an X drive motor 71 composed of a step motor, an intermediate gear 73 meshing with a pinion of an output shaft of the X drive motor 71, and an intermediate gear 73 fixed thereto. It consists of a feed screw 74 along the X direction, a nut 75, and a PI (photo interrupter) 76 which is an X frame initial position detection sensor.

  Instead of the position detector of PI (photo interrupter) 76, it is also possible to replace it with a position detector that performs initial position detection by a combination of a photo reflector or a Hall element and a flat permanent magnet.

  The nut 75 is screwed into the feed screw 74 in a rotationally restricted state with respect to the X frame 16 and is supported so as to be slidable in the X direction. It abuts on the letter-shaped notch 16b. Accordingly, when the X drive motor 71 is rotationally driven during the blur correction operation, the nut 75 and the X frame 16 are displaced and driven in the X direction by the feed screw 74.

  The Y drive unit 80 is assembled on the front surface side of the second corner portion 14 c of the base plate 14 and is disposed above the zoom motor 51 on the outer peripheral portion of the fixed frame 13. The Y drive unit 80 has a Y drive unit support plate 82, a Y drive motor 81 composed of a step motor, an intermediate gear 83 meshing with a pinion of the output shaft of the Y drive motor 81, and an intermediate gear 83 fixed thereto. It consists of a feed screw 84 along the direction, a nut 85, and a PI (photo interrupter) 86 which is a Y frame initial position detection sensor.

  The nut 85 is threadably engaged with the feed screw 84 under the rotation restriction state with respect to the Y frame 15 and is supported so as to be slidable in the Y direction. It is in contact with the letter-shaped notch 15b. Accordingly, when the Y drive motor 81 is rotationally driven during the shake correction operation, the nut 85 and the Y frame 15 are displaced and driven in the Y direction by the feed screw 84.

  In the shake correction imaging unit 90, during the image sensor exposure operation by camera shake correction, the Y frame 15 and the X frame 16 are driven to be displaced on the XY plane according to camera shake. Immediately after the power switch of the digital camera is turned on, the Y frame 15 and the X frame 16 are respectively returned to the initial intermediate positions based on the output signals of I86 and PI76. In the state where the Y frame 15 and the X frame 16 are at the initial intermediate position, the center position of the light receiving surface of the image sensor 96 coincides with the optical axis O.

  In the shake correction imaging unit 90, the arrangement of the X drive unit 70 and the Y drive unit 80 with respect to the base plate 14 is turned upside down with respect to the above-described arrangement, and the X drive unit 70 is moved to the first corner 14b. It is also possible to arrange the Y drive unit 80 at the second corner 14c.

  In the lens barrel 1 described above, the exterior color of the zoom motor 51, the focus motor 61, the Y drive motor 81, and the X drive motor 71 is black or other than black, for example, silver, and the fixed frame 13 and The exterior color of the base plate 14 is a color other than black, for example, silver or black. Thus, for example, each motor of the zoom motor 51, the focus motor 61, the Y drive motor 81, and the X drive motor 71 in a state in which the assembly state during the assembly process is confirmed by making the exterior color of the component member and the motor different. The base plate 14 can be fixed to the fixed frame 13 by confirming that the fixed frame 13 and the base plate 14 are mounted at the predetermined positions described above.

  Next, the arrangement of an FPC (flexible printed circuit board) for electrical connection between the electrical control elements of the respective constituent units of the lens barrel 1 and the control unit of the digital camera will be described with reference to FIGS. .

  The FPC for electrical connection provided in the lens barrel 1 is an FPC 101 for electrical connection between the zoom and focus drive units 50 and 60, the shutter / aperture control unit 8 and the camera-side electrical control unit, and X and Y drive. The unit includes an FPC 102 for electrical connection between the units 70 and 80 and the camera-side electrical control unit, and an FPC 103 for electrical connection between the image sensor unit 95 and the camera-side electrical control unit.

  The FPC 101 includes a zoom motor connector 101a, a focus motor connector 101b, a focus position detection PI connector 101f, a connection extension 101c to the focus motor connector, a left extension 101d, A control connector 101g, a shutter / aperture control unit FPC connector 101e, and a zoom position detection PI connector and a PR connector are also provided (FIG. 2).

  In the FPC 101, as shown in FIG. 10, a zoom motor connector portion 101 a disposed at one end is connected to a terminal portion of the zoom motor 51. Further, the focus motor connector portion 101b branched from the connecting extension portion 101c in the middle of the left extension portion 101d of the FPC 101 extending leftward along the upper outer peripheral portion of the fixed frame 13 is the focus motor 61. Connected to the terminal portion of The left extending portion 101d is connected to the PI 68 at a PI connector portion 101f that branches rearward after being inserted through the upper outer periphery of the fixed frame 13. Further, after passing through the upper outer periphery of the fixed frame 13, the branched shutter / aperture control unit FPC connector portion 101e is connected to a shutter / aperture control unit FPC (not shown). The FPC 101 is connected to a camera electrical control unit (not shown) with a camera electrical control connector portion 101g extending leftward after passing through the upper outer periphery of the fixed frame 13 to the left.

  The FPC 102 includes an X motor connector portion 102a, a Y motor connector portion 102b, PI connector portions 102c and 102d, a lateral extension portion 102e, a downward extension portion 102f, and a camera electrical control connector portion 102g. (Fig. 2).

  In the FPC 102, the Y motor connector portion 102 b is connected to the Y drive motor 81, the PI connector portion 102 d is connected to PI 86, and the PI connector portion 102 c is connected to PI 76, and then the lateral extension portion 102 e is connected to the right side surface of the fixed frame 13. After the X motor connector portion 102a is connected to the X drive motor 71, the downward extending portion 102f is inserted along the outer periphery of the lower portion of the fixed frame. And the camera electrical control connector part 102g extended in the left direction is connected to a camera electrical control part (not shown).

  The FPC 103 includes an image sensor mounting connecting portion 103a, a V-shaped bent portion 103b with a central slit for supporting the image sensor 96 so as to be displaceable on the XY plane, and a camera electrical control connector portion 103c. (FIG. 2).

  In the FPC 103, after the mounting connection portion 103a is connected to the image sensor 96, the back surface portion of the base plate 14 is moved to the left through the V-shaped bent portion 103b housed in the FPC bent portion housing recess 14f (FIG. 6) of the base plate 14. The camera electrical control connector portion 103c that is inserted through and extends in the left direction is connected to a camera electrical control portion (not shown).

  A retracting operation, a feeding operation, a blur correction operation, and the like in the lens barrel 1 of the present embodiment having the above-described configuration will be described.

  The lens barrel 1 is set in the wide-angle or telephoto state shown in FIGS. 7 and 8 by the extension operation from the retracted state shown in FIG. Specifically, the zoom motor 51 is driven under the control of the camera-side control unit, and the rotary frame 11 is rotated and driven out. As the rotating frame 11 is rotated and extended, the barrier unit 3 is first opened, and the first group frame 4, the second group frame 6, the third group frame 7, and the shutter / aperture unit 8 are each based on the distance measurement signal. Move to the zoom position. Further, the focus motor 61 is driven based on the distance measurement signal, the fourth group frame 12 is extended to the focus position, and the lens barrel 1 is ready for photographing.

  Further, at the time of blur correction shooting, when the image sensor 96 is exposed, an X drive motor is controlled under the control of the control unit of the digital camera based on the camera shake signal detected by the camera shake detection sensor on the digital camera side. 71 and the Y drive motor 81 are driven, the Y frame 15 and the X frame 16 are displaced accordingly, and the image sensor 96 is driven in a direction to correct camera shake. An imaging signal without camera shake is output from the imaging device 96 arranged on the X frame 16 driven in the camera shake correction direction.

  In the lens barrel 1, when the lens barrel 1 is retracted from the shootable state to the retracted state, each movable frame member is retracted to the fixed frame 13 side by driving the zoom motor 51 and the focus motor 61 to be in the retracted state. In the retracted state, the movable frame members are in close contact with each other or very close to close contact, and the first group lens 22 to the fourth group lens 23 are also close to each other.

  In particular, the first group frame 4, the second group frame 6, and the third group frame 7 are brought into a state where they are close to each other. Specifically, as described above, the cam groove 5c of the cam frame 5 fitted into the cam follower 39 of the second group frame 6 is composed of the cam groove 5ca and the cam groove 5cb having different groove widths. When in this state, the cam follower 39 is fitted into the cam groove 5cb having a large fitting gap.

  Therefore, even when the lens barrel 1 is retracted and the lens barrel 1 is in the retracted state and the first group frame 4 on the front side of the second group frame 6 is in a state of interfering with each other due to variations in the shape dimensions of those members. The cam follower 39 is relatively movable with respect to the cam groove 5cb at least for the fitting gap. The second group frame 6 can move by the above-mentioned interfered dimension toward the rear third group frame 7 against the conical coil spring 21 against the urging force. Accordingly, the lens barrel 1 can be retracted without being disturbed.

  On the other hand, as described above, in the retracted state, the shutter blades 25 and the diaphragm blades 26 are driven to the open position, and the rear part of the third lens group 23 enters the open opening, and the shutter / diaphragm unit 8 and the three A state in which the group frame 7 is closer to the close contact is obtained, and at the same time, a state in which the group frame 7 is extremely close to the fourth group lens 24 can be obtained. Furthermore, the length of the optical axis O direction occupied by the photographing optical system when the lens barrel is in the close contact state is shortened by constituting the photographing optical system with two first group lenses 21 and the fourth group lens 24 comprising one positive lens component. can do.

  Further, as described above, the zoom drive unit 50 and the focus drive unit 60 for driving the lens barrel forward and backward, and the X drive unit 70 and the Y drive unit for blur correction are arranged on the outer peripheral portion of the fixed frame 13 and the base plate 14. The arrangement of the lens barrel 1 so as not to cause a dead space prevents an increase in the length of the lens barrel 1 in the optical axis O direction.

  The lens barrel 1 of the present embodiment can realize a shortening of the total length in the direction of the optical axis O in the retracted state for the reason described above. Specifically, the dimension La from the back surface of the base plate 14 of the lens barrel 1 to the front end surface of the fixed frame 13 in the retracted state is 17.5 mm, and the ornament on the front side of the group frame 4 from the front end surface of the fixed frame 13 The dimension Lb to the front surface of the ring 33 can be suppressed to 4 mm, and the total length of the lens barrel can be 21.5 mm.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention at the stage of implementation. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements.

  As described above, the lens barrel and the imaging device of the present invention are a lens barrel capable of shortening the length in the photographic lens optical axis direction in the retracted state, and an imaging device to which the lens barrel is applied. It can be used.

4 ... Group frame (first frame member)
5 ... Cam frame (cam frame member)
5a ... Cam groove (first cam groove)
5c ... Cam groove (second cam groove)
6 ... Two-group frame (second frame member)
7 ... Third group frame (third frame member)
12 ... Fourth group frame (fourth frame member)
13: Fixed frame (fixed frame member)
14 ... Base plate (base member)
18 ... Conical coil spring (biasing member)
21 ... Group lens (imaging optical system, first lens group)
22 ... Two-group lens (shooting optical system, second lens group)
23. Three-group lens (photographing optical system, third lens group)
24. Four-group lens (photographing optical system, fourth lens group)
36 ... (first cam follower)
39 ... (second cam follower)
96 ... Image sensor O ... Optical axis (photographing lens optical axis)

Claims (5)

In a retractable lens barrel,
A photographing optical system having a plurality of lens groups and an optical axis composed of the lens groups;
A fixed frame member;
A cam frame member that has a first cam groove and a second cam groove that are inclined with respect to the lens group optical axis, and is driven forward and backward relative to the fixed frame member;
Of the plurality of lens groups, the first front lens group is held, and the first cam follower is slidably fitted into the first cam groove, and the rotation is restricted. A first frame member that is driven back and forth by the cam frame member via the first cam follower;
Of the plurality of lens groups, the second lens group on the rear side of the first lens group is held, and a second cam follower is slidably fitted into the second cam groove. A second frame member that is driven back and forth by the cam frame member through the second cam follower in a state where the rotation is restricted;
A third frame member that holds the third lens group on the rear side of the second lens group among the plurality of lens groups, is supported in a rotationally regulated state, and is driven forward and backward;
An urging member interposed between the second frame member and the third frame member, and urging the frame member in a direction away from the lens group optical axis direction;
The second cam groove is in a fitted state with a small clearance in the lens group optical axis direction with respect to the second cam follower when the cam frame member is at a rotational position where the photographing can be performed. When the cam frame member is in the retracted rotation position, the cam frame has a cam groove shape with a large gap in the lens group optical axis direction, the lens barrel is in the retracted state, and the first frame When the member and the second frame member are in contact, the second cam follower is movable in the retracted direction in the gap of the second cam groove,
further,
On the rear side of the third lens group, a shutter / aperture unit supported by the third frame member so as to be capable of moving back and forth in the lens group optical axis direction;
A compression spring that urges the third frame member and the shutter / aperture unit away from each other in the lens group optical axis direction;
A fourth frame member that holds a fourth lens group composed of a single positive-power lens as a focus lens group on the rear side of the third lens group among the plurality of lens groups;
When the lens barrel is in the retracted state, the third frame member and the shutter / aperture unit are separated by a predetermined distance in the lens group optical axis direction,
When the lens barrel is in the retracted state, the shutter blades and the diaphragm blades of the shutter / diaphragm unit are driven to the open position, and the compression spring is compressed into the opening of the shutter / diaphragm unit. The lens barrel, wherein the third frame member and the shutter / aperture unit are close to each other until the third lens group enters.   The urging member is a conical coil spring member, and the end of the large-diameter side winding portion is bent to the inner diameter side in order to prevent the coil portion of the large-diameter side winding portion from overlapping in the radial direction in a compressed state. The lens barrel according to claim 1, wherein the lens barrel is formed.   The first lens group as the plurality of lens groups includes a single negative refractive power lens and a single positive refractive power lens, and the second lens group includes a negative refractive power lens group and positive refractive power. 3. The lens barrel according to claim 2, wherein the lens barrel includes a power lens group, and the third lens group includes a positive refractive power lens group and a negative refractive power lens group. A lens barrel according to claim 1;
A base member fixedly supported by a fixed frame member;
Imaging for converting to a subject image electrical signal supported by the base member so as to be displaceable on a surface orthogonal to the optical axis of the imaging optical system and imaged by the imaging optical system in order to perform camera shake correction Elements,
An image sensor displacement drive actuator for driving the image sensor to be displaced on a plane orthogonal to the optical axis of the imaging optical system;
An imaging apparatus comprising: The imaging apparatus according to claim 4, wherein the imaging element has a different exterior color of the displacement drive actuator and an exterior color of the fixed frame member and the imaging base plate.

Images