JP2010266749A - Lens barrel and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel which has high accuracy in detecting the position of a movable frame, and which can be made to be compact. <P>SOLUTION: The lens barrel includes: a fixed frame 13; a photographing optical system having a photographing lens optical axis, and including a focus lens 24; a fourth-group frame 12, connected to a focus motor 61 supported by the fixed frame 13 and the motor 61, holding a feed screw 66, a reduction gear train 63 and the focus lens 24, and functioning as a focusing frame supported so as to be movable backward and forward in the optical axis direction by the fixed frame 13; a PI 68 supported by the fixed frame 13 to detect the original point position of the fourth-group frame 12 in the optical axis direction; and a shielding protrusion part 64a which engages with the feed screw 66, and which passes through the PI 68 of original point detection to detect the original point position. Also, the lens barrel includes a nut 64 which is movably supported in the optical axis direction in the rotation-controlled state by fitting the protrusion part into a guide groove 13f formed in the fixed frame 13, and which is supported in contact with the four-group frame 12. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lens barrel including a lens holding frame capable of moving forward and backward, and an imaging apparatus having the lens barrel.

  Conventionally, a lens barrel provided with a lens holding frame lens capable of moving back and forth is disclosed in Patent Document 1, in which optical zooming, feeding, and storage are performed by moving a lens frame that holds a lens group. The present invention relates to a possible lens barrel.

  In the lens barrel according to Patent Document 1, the focus lens holding frame for holding the focus lens is supported by the fixed frame so as to be able to advance and retreat along the lens optical axis via the guide shaft and the straight guide groove. It is driven back and forth via an advance / retreat drive mechanism which will be described later. An origin detection sensor comprising a photo interrupter for detecting the origin position of the focus lens holding frame is disposed on the fixed frame, and the origin detection sensor is provided on the focus lens holding frame for origin detection. The origin position of the focus lens holding frame is detected by detecting the passage of the detection rib.

  As a forward / backward drive mechanism for the focus lens holding frame, a feed screw that is rotationally driven by a focus motor and a nut member that is screwed to the feed screw are disposed. The nut member is provided with a rotation restricting rib for restricting rotation, and a groove through which the rotation restricting rib passes is provided in the fixed frame. The fixed frame is also provided with a clearance groove for inserting a detection rib for detecting an origin provided on the focus lens holding frame.

JP 2007-52221 A

  However, in the lens barrel disclosed in Patent Document 1, as described above, the fixed frame includes a groove through which the rotation restriction rib of the nut member passes and a relief groove through which the detection rib for detecting the origin passes. Therefore, the outer shape of the fixed frame is increased by that amount, which is disadvantageous for downsizing the lens barrel.

  Also, if adjustment of the centering of the lens is necessary when assembling the lens barrel, the position of the detection rib for detecting the origin as well as the focus lens holding frame changes the position on the plane orthogonal to the lens optical axis. To do. Therefore, it is necessary to employ a sensor having a gap corresponding to the detection rib position change as the origin detection sensor, and the detection accuracy may be lowered.

  The present invention has been made to solve the above-described problems, and provides a lens barrel having a high position detection accuracy of a movable frame and capable of being miniaturized, and an imaging apparatus to which the lens barrel is applied. For the purpose.

  In order to solve the above problems, a lens barrel according to one aspect of the present invention includes a fixed member, a photographing optical system having a photographing lens optical axis and including a focus lens, a focus motor supported by the fixing member, and A focus driving unit supported by the fixing member and connected to the focus motor, and including a feed screw and a focus driving speed reduction mechanism, and the focus lens, and the fixing member in the direction of the optical axis of the photographing lens. A movable frame supported so as to be movable back and forth, an origin detection sensor supported by the fixed member for detecting an origin position in the optical axis direction of the movable frame, and the origin position by passing through the origin detection sensor Shielding projections are provided for detection, and rotation is restricted by fitting the shielding projections into guide grooves provided in the fixing member. It is movably supported on the photographing lens optical axis direction in a state screwed with the feed screw, and, and a nut member abuts on the movable frame.

  An image pickup apparatus according to another aspect of the present invention includes a lens barrel according to claim 1, an image pickup element that receives an optical image formed through the photographing optical system and generates image data, and the lens barrel. A first corner that is coupled to the fixed frame and located at one corner in four directions centered on the optical axis of the imaging optical system, and straddles the optical axis of the imaging optical system with respect to the first corner. A second corner located at one corner, a third corner located at one corner located opposite to the first corner and the optical axis of the imaging optical system, the second corner, and the A fourth corner located at one corner on the opposite side via the optical axis of the imaging optical system, and the imaging element is arranged in a first direction and in a first plane within a plane parallel to the light receiving surface of the imaging element. A base member that is displaceably supported in a second direction orthogonal to one direction, and is provided on the base member, and the image sensor is A first drive unit including a first motor that drives in a first direction and a second drive unit including a second motor that drives in the second direction, and a first corner of the base member The first driving unit or the second driving unit is mounted, the second corner is mounted with the second driving unit or the first driving unit, and the third corner is A cutout portion into which a portion protruding from the fixed member of the focus drive unit enters is formed.

  ADVANTAGE OF THE INVENTION According to this invention, the position detection accuracy of a movable frame is high, and the imaging device which applies this lens barrel which can be reduced in size, and this lens barrel can be provided.

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. 1 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 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. It is XVII-XVII sectional drawing of FIG. 12, Comprising: The fragmentary sectional view of the focus drive unit in the retracted state of a lens-barrel It is XVIII-XVIII sectional drawing of FIG. 12, Comprising: Sectional drawing around the feed screw of a focus drive unit in the retracted state of a 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, the direction that is orthogonal to the optical axis O and viewed from the front side is the X direction that is the first direction, and the right direction is the + X side. A direction (vertical direction) perpendicular to the optical axis O and the X direction is a second direction, 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. A first group frame 4 that is a zoom lens holding frame that holds the lens 21, a second group frame 6 that is a zoom lens holding frame that holds the second group lens 22, and a cam frame for driving the first group frame 4 and the second group frame 6 to advance and retreat. 5, a shutter / aperture unit 8 on the rear side, a third group frame 7 that is a zoom lens holding frame for holding the third group lens 23, and a frame member for restricting the rotation of the first and second group frames. The float key 9 and the cam frame 5 are driven forward / backward, and the movable frame 10 for restricting the rotation of the third group frame 7 and the float key 9 and the cam frame 5 are rotationally driven to restrict the rotation of the float key 9. In order to drive the third group frame 7 forward and backward The rotating frame 11, the fourth group frame 12 that is a movable frame that holds the fourth group lens 24, and a fixing member that supports the rotating frame 11 so as to be capable of rotating forward and backward and restricts the rotation of the moving frame 10 The fixed frame 13 fixedly supported on the side, the zoom drive unit 50 that rotationally drives the rotary frame 11, the focus drive unit 60 that drives the fourth group frame 12 forward and backward, and the base plate 14 that is a base member are assembled and imaged. A blur correction imaging unit 90 is provided for holding the element 96 and driving the imaging element 96 to move 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, a gear housing recess 13d in which a long gear 54 described later is housed, a focus drive unit housing recess 13e in which the focus drive unit 60 is housed, and an inner wall portion of the housing recess 13e along the optical axis O direction. And a shielding protrusion guide groove 13f. Further, a zoom drive unit 50 is disposed on 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).

  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.

  The cam groove 5c for the second group frame is composed of cam grooves having different groove widths, and when the lens barrel 1 is in a wide state from the telephoto state to the tele state, a cam follower 39 of the second group frame 6 to be described later is formed on the cam groove 5c. Of these, when fitted into a cam groove without a gap and in a retracted state, the cam groove 5c is fitted into a cam groove with a gap. This prevents an interference state between the first group frame 4 and the second group frame 6 when the lens barrel 1 is in the retracted state.

  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 which is a zoom 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 zoom lens group, and has three guide projections 6a on the outer peripheral portion, and a cam follower 39 protruding outward from the center of the guide projection 6a. It 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 zoom lens group, and supports a shutter / aperture 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). Since the second group frame 6 and the third group frame 7 are urged away from each other as described above, the cam follower of the second group frame 6 can be used when the lens barrel 1 is in a state where it can be photographed including the retracted state. 39, the cam groove 5c of the cam frame 5, the cam follower 41 of the third group frame 7, and the cam groove 11c of the rotary frame 11 are each fitted together, and the second group frame 6 in the state where there is no play in the optical axis O direction. And the third group frame 7 can be moved forward and backward.

  In addition, the conical coil spring 18 is provided with a bent portion 18a that is bent to the inner diameter side at 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 focus lens group, in a central opening, and has two arms extending outward. The one arm is provided with a rotation restricting guide projection 12c, and the other arm is provided with a straight guide guide shaft hole 12a and a feed screw insertion hole 12b.

  A guide shaft 65 supported by the fixed frame 13 is slidably fitted into the guide shaft hole 12a. The guide protrusion 12 c is formed to protrude in both widths (circumferential direction) around the optical axis O, and includes two micro cylindrical portions extending in the direction parallel to the optical axis O. The guide protrusion 12 c has a backlash in the straight guide groove 13 b of the fixed frame 13. Fits slidably. Therefore, the fourth group frame 12 is supported by the driving force of the focus drive unit 60 so as to be able to advance and retreat in the optical axis O direction along the guide shaft 65 and the rectilinear guide groove 13b through the feed screw 66 and the nut 64 as will be described later. The

  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 disposed 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 rotation transmission. It consists of a reduction gear train 53 and a long gear 54 constituting the mechanism.

  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 housed in the focus drive unit housing recess 13e at the upper left of the outer peripheral portion of the cylinder, and as shown in FIGS. 4, 12, and 17, a focus motor 61 composed of a step motor, a gear case lid 62, and the like. This is an origin detection sensor comprising a guide shaft 65 constituting a rotation transmission mechanism, a feed screw 66, a reduction gear train 63 as a focus drive transmission reduction portion, a nut 64 and a fourth group frame biasing spring 67, and a photo interrupter. It consists of PI 68 for focus origin detection.

  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 61 a 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 disposed along a direction parallel to the optical axis O, and its shaft end portion is supported by the fixed frame 13 and the gear case lid 62. Then, it is rotationally driven by a focus motor 61 through a gear train 63. The feed screw 66 is screwed into the nut 64 and is in contact with the end surface portion of the feed screw insertion hole 12b of the fourth group frame 12 in contact with the rear surface of the nut 64.

  As shown in FIGS. 4 and 18, the nut 64 is screwed onto the feed screw 66. The nut 64 protrudes toward the outer periphery of the nut, and further protrudes toward the rear end. A thin plate-shaped shielding protrusion 64a is integrally provided. The shielding protrusion 64a is slidably fitted into the shielding protrusion guide groove 13f of the fixed frame 13 with the nut 64 screwed to the feed screw 66. Therefore, when the feed screw 66 rotates, the nut 64 moves forward and backward along the optical axis O direction in a state where the rotation is restricted by the guide groove 13 f of the fixed frame 13. Further, as will be described later, the shielding protrusion 64a is allowed to enter the detection opening 68a of the focus origin detection PI 68.

  The fourth group frame biasing spring 67 is formed of a conical coil spring as shown in FIGS. 4 and 17, and between the boss portion of the fourth group frame guide shaft hole 12 a and the inner surface of the gear case lid 62 on the rear side of the guide shaft 65. The fourth group frame 12 is urged forward (to the nut 64 side). The front peripheral surface of the feed screw insertion hole 12b of the fourth group frame 12 comes into contact with the rear end surface of the nut 64 screwed into the feed screw 66 by the urging force. Accordingly, when the feed screw 66 is rotationally driven during the retracting drive and the focusing drive, the fourth group frame 12 receives the biasing force of the fourth group frame biasing spring 67 and is integrated with the nut 64 in the direction of the optical axis O. Move forward and backward.

  As shown in FIG. 4, the focus origin detection PI 68 has a U-shaped detection opening 68 a serving as a detection unit, and the guide groove for the shielding projection of the fixed frame 13 on the rear end surface of the fixed frame 13. It is fixedly supported in a state where the center of the detection opening 68a is aligned with 13f. Accordingly, when the lens barrel 1 is retracted toward the retracted state and the nut 64 is moved to the rearmost end side (collapsed position side), the shielding protrusion 64a of the nut 64 becomes the guide groove for the shielding protrusion of the fixed frame 13. While being guided by 13 f, the protruding rear end side of the shielding projection 64 a enters the detection opening 68 a of the PI 68. When the power switch of the camera is turned on, the nut 64 starts to move forward from the rearmost end (collapsed position), but when the fourth group frame 12 passes through the focus origin position near the retracted position, the focus is set by the PI 68. The origin position is detected, and the output 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.

  As described above, in the focus drive unit 60, the nut 64 moves forward and backward along the feed screw 66 when the lens barrel 1 is retracted or focused, and the fourth group frame 12 advances and retracts in the direction of the optical axis O. Move to the retracted or focusing position. At the start of feeding from the retracted state to the imageable state, the focus origin detection PI 68 detects passage of the focusing origin position for focus drive control of the fourth group frame 12.

  The fourth group lens 24 held by the above-described fourth group frame 12 is a circular lens group as shown in FIGS. 2 and 12, but is not limited thereto, and is shown by, for example, a two-dot chain line in FIG. 12. The above-described focus driving unit 60 can be applied to the fourth group frame 12A to which the D-cut fourth group lens 24A is applied. The fourth group frame 12A to which the fourth group lens 24A is applied has a configuration in which the third group frame holding the third group lens is rotated on the XY plane and retracted to the side of the fourth group frame 12A when retracted. The present invention is applied to a lens barrel for reducing the length when retracted.

  In the lens barrel 1, the shielding projection guide groove 13 f for guiding the shielding projection 64 a of the nut 64 is provided on the fixed frame 13 side. However, if the focus motor 61 is on the blur correction imaging unit 90 side. If the lens barrel has a structure in which a guide shaft 65 and a feed screw 66 for guiding the fourth group frame 12 are supported by the base plate 14, the guide for the shielding protrusion is used. It is also possible to arrange the groove 13f and the focus origin detection PI 68 on the base plate 14 side.

  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, and an X drive unit as a first drive unit 70 and a Y drive unit 80 as a second drive unit.

  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 holes 14f and 14g (FIG. 11) are fixed in a state where the positioning 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 an arc-shaped portion in a state along the outer periphery of the fixed frame 13. The arc-shaped portion serves as an escape portion for arranging the 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 includes an X drive unit support plate 72, an X drive motor 71 that is a first motor composed of a step motor, an intermediate gear 73 that meshes with a pinion of an output shaft of the X drive motor 71, and an intermediate The gear 73 is fixed, and includes a feed screw 74 along the X direction, a nut 75, and a PI (photo interrupter) 76 that is an X frame initial position detection sensor. Instead of the position detector of PI76, it is also possible to arrange 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. The nut 75 receives the urging force of the urging spring and receives the U of the X frame 16. It abuts on the letter-shaped notch 16b. Therefore, when the X drive motor 71 is rotationally driven during the shake 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 includes a Y drive unit support plate 82, a Y drive motor 81 that is a second motor composed of a step motor, an intermediate gear 83 that meshes with a pinion of the output shaft of the Y drive motor 81, and an intermediate gear. 83 is fixed, and includes a feed screw 84 along the Y direction, a nut 85, and a PI (photo interrupter) 86 that is a Y frame initial position detection sensor.

  The nut 85 is threadably engaged with the feed screw 84 under a rotation restricted 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 blur 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.

  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 an 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 101g extending in the left direction after passing 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 102b is connected to the Y drive motor 81, the PI connector portion 102d is connected to PI 86, and the PI connector portion 102c is connected to PI 76, and then the lateral extension portion 102e is connected to the outer periphery of the right side surface of the fixed frame 13. Further, 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 rotary frame 11 is rotated and extended, first, the barrier unit 3 is 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 distance measurement signals. 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.

  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 in a state very close to close contact, and the first group lens 22 to the fourth group lens 23 are also in close contact with each other. Therefore, shortening of the total length in the optical axis O direction in the retracted state can be realized.

  Further, as described above, the zoom drive unit 50 for driving the lens barrel forward and backward is disposed on the right side of the outer peripheral portion of the fixed frame 13, and the focus drive unit 60 is disposed on the upper left of the outer peripheral portion of the fixed frame 13. Further, the X drive unit 70 and the Y drive unit for blur correction are located at the right upper and lower corners of the base plate 14 so that there is no dead space above and below the zoom motor 51 on the right side of the outer periphery of the fixed frame 13. Deploy.

  The FPC 101 for connecting the zoom drive unit 50, the focus drive unit 60, the shutter / diaphragm unit 8 and the camera control unit, and the FPC 102 for connecting the X drive unit 70 and the Y drive unit and the camera control unit are fixed. It is arranged to extend toward the camera control unit side along the top and bottom of the outer periphery of the frame 13. With these arrangement structures, the projection area in the optical axis O direction occupied by the lens barrel 1 including the blur correction imaging unit 90 can be reduced, and downsizing of the lens barrel 1 as an imaging device can be realized.

  Further, in the focus drive unit 60, as described above, the fourth group frame 12 rotates around the optical axis O by the fourth group frame rectilinear guide groove 13 b of the fixed frame 13 and the guide shaft 65 supported by the fixed frame 13. In a restricted state, it is supported so as to be able to advance and retract along the optical axis O direction, and is driven to advance and retract in the optical axis O direction via a nut 64. The nut 64 is slidably fitted into the shielding projection portion guide groove 13f of the fixed frame 13 so that the rotation of the nut 64 is restricted, and the position of the rear end projection portion of the shielding projection portion 64a is controlled. Is detected by the focus origin detection PI 68, the focus origin position of the fourth group frame 12 is recognized. Therefore, it is not necessary to provide the fourth group frame 12 with a shielding projection for detecting the focus origin position, the space occupied by the fourth group frame 12 can be reduced, and the fixed frame 13 for restricting the rotation of the nut 64 can be reduced. Since the PI 68 is arranged so as to face the shielding projection guide groove 13f, the PI 68 can be easily arranged on the fixed frame 13, the outer shape of the fixed frame 13 can be reduced, and the lens barrel of the lens barrel can be reduced. Miniaturization can be realized.

  For a lens barrel that needs to be centered with respect to the optical axis O of the lens barrel 1, the fourth group frame 24 held by the fourth group frame 12 is adjusted by the optical axis adjustment. 12 even if the position on the plane orthogonal to the optical axis O (XY plane) is changed, the feed screw 66 and the feed screw insertion hole 12b of the fourth group frame 12 are fitted with a backlash in the radial direction. There is no effect on the nut 64 position. Accordingly, the gap for sliding between the shielding projection guide groove 13f of the fixed frame 13 and the shielding projection 64a of the nut 64 can be reduced, and the rotation play around the axis of the nut 64 can be suppressed. As a result, a narrow detection opening 68a of the focus origin detection PI 68 can be applied, and the detection accuracy of the focus origin position is improved.

  Further, since the rotation restricting guide projection 12c of the fourth group frame 12 is composed of two minute partial cylindrical portions or minute partial spherical surface portions protruding in the width direction (circumferential direction of the optical axis O), the fourth group frame as described above. When the position of the fourth group frame 12 on the XY plane changes due to the centering of the lens 24 with respect to the optical axis O, the guide protrusion 12c comes into contact with the rectilinear guide groove 13b of the fixed frame 13 on both sides of the groove. An unstable mating state is eliminated.

In the embodiment of the present invention, the focus frame is the fourth group frame 12. However, in the case of a lens barrel made of a third group lens, the third group frame is the focus frame. In the case of a lens barrel made of a second group lens, the second group frame can be replaced with a focus frame.

  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 of the present invention and the imaging apparatus to which the lens barrel is applied have a high position detection accuracy of the movable frame and can be miniaturized, and an imaging to which the lens barrel is applied. It can be used as a device.

12 ... Fourth group frame (movable frame)
12a ... guide shaft hole 13 ... fixed frame (fixed member)
13f ... Guide groove (guide groove of fixing member)
14 ... Base plate (base member)
14b ... First corner 14c ... Second corner 14d ... Third corner 14e ... Fourth corner 21 ... Group lens (imaging optical system)
22 ... Two-group lens (imaging optical system)
23. Three-group lens (imaging optical system)
24. Four-group lens (photographing optical system)
50: Zoom drive unit 51: Zoom motor (zoom drive unit)
53 ... Reduction gear train (rotation transmission mechanism, zoom drive unit)
60 ... Focus drive unit 61 ... Focus motor (Focus drive unit)
63 ... reduction gear train (deceleration mechanism for focus drive,
Focus drive unit)
64 ... nut (nut member)
64a ... shielding projection 65 ... guide shaft 66 ... feed screw (focus drive deceleration mechanism,
Focus drive unit)
68 ... PI (origin detection sensor)
70 ... X drive unit (first drive unit)
71 ... X drive motor (first motor)
80 ... Y drive unit (second drive unit)
81 ... Y drive motor (second motor)
96 ... Image sensor 101 ... FPC (flexible printed circuit board for connection)
O ... Optical axis (photograph lens optical axis)
X ... first direction Y ... second direction

Claims (5)

A fixing member;
A photographic optical system having a photographic lens optical axis and including a focus lens;
A focus motor supported by the fixed member, a focus drive unit supported by the fixed member and connected to the focus motor, and including a feed screw and a focus drive deceleration mechanism;
A movable frame that holds the focus lens and is supported by the fixed member so as to be movable back and forth in the optical axis direction of the photographing lens;
An origin detection sensor supported by the fixed member for detecting the origin position of the movable frame in the optical axis direction;
The photographing projection is provided with a shielding projection that detects the origin position by passing through the origin detection sensor, and the photographing is performed in a state where the rotation is regulated by fitting the shielding projection into a guide groove provided in the fixing member. A nut member supported so as to be movable in the lens optical axis direction, screwed with the feed screw, and abutting the movable frame;
A lens barrel characterized by comprising: A connecting flexible printed circuit board for controlling the photographing optical system is disposed on the outer periphery of the fixed frame and outside the focus driving unit, and the connecting flexible printed circuit board is connected to the origin detecting sensor. The lens barrel is provided with an output signal line and a drive line for driving the focus motor. In addition, a guide shaft supported by the fixing member in parallel with the optical axis of the photographic lens is provided, and the movable frame is provided with a shaft hole through which the guide shaft is slidable, and the focus drive 3. The lens barrel according to claim 1, wherein the movable frame sometimes moves back and forth in the direction of the photographic lens optical axis along the guide axis. A lens barrel according to claim 1;
An image sensor that receives an optical image formed through the photographing optical system and generates image data;
A first corner portion coupled to the fixed frame of the lens barrel and positioned at one corner in four directions centering on an optical axis of the photographing optical system; and the photographing optical system with respect to the first corner portion. A second corner located at one corner that does not straddle the optical axis, a third corner located at one corner located opposite to the first corner and the optical axis of the photographing optical system, and the second corner A first corner in a plane parallel to the light receiving surface of the imaging element, and a fourth corner located at one corner located on the opposite side via the optical axis of the imaging optical system. A base member that is displaceably supported in a direction and a second direction orthogonal to the first direction;
A first drive unit provided on the base member and including a first motor for driving the imaging element in the first direction and a second drive unit for driving in the second direction;
The first drive part or the second drive part is mounted on the first corner of the base member, and the second drive part or the second drive part is mounted on the second corner. An imaging apparatus, wherein a first drive unit is mounted, and a cutout portion into which a portion protruding from the fixed member of the focus drive unit enters is formed at the third corner portion. The zoom lens further includes a zoom motor provided on an outer peripheral portion of the lens barrel, and includes a zoom motor for performing zooming driving of the photographing optical system and a rotation transmission mechanism thereof. When viewed from the optical axis direction of the system, the zoom motor is disposed between the first drive unit and the second drive unit, and the rotation transmission mechanism is more photographed than the first drive unit or the second drive unit. The imaging apparatus according to claim 4, wherein the imaging apparatus is disposed on the subject side in the optical axis direction so as to overlap the first driving unit or the second driving unit.

Images