JP5592761B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus such as an electronic camera.

  2. Description of the Related Art In recent years, image pickup apparatuses that take an image of a subject using an image pickup device such as a CCD or a CMOS sensor have become widespread. In these image pickup devices, a movable lens frame, in particular, a lens frame that holds a focusing lens, is driven forward and backward in the optical axis direction, a motor, a lead screw that is rotationally driven by the motor, and a screw member that engages with the lead screw. Is used to move the movable lens frame forward and backward together with the screw member (see, for example, Patent Documents 1 and 2).

  For example, Patent Document 1 describes an imaging device having a lens barrel provided with a bent imaging optical system. In this imaging apparatus, the second group, the fourth group, and the fifth group lens among the five-group lens groups are movable lenses. Of these, the fifth group lens that performs focusing is supported by a fifth group lens frame that is formed integrally with the sleeve. The sleeve has a female screw member that engages with a lead screw that extends in the optical axis direction rotated by a motor disposed on the imaging element side, and a guide shaft that extends in the optical axis direction penetrates slidably. doing. Thereby, the fifth group lens is driven forward and backward in the optical axis direction by rotating the motor.

  Further, according to Patent Document 2, an imaging device having a telescopic lens barrel provided with a four-group lens group is described. In this imaging device, among the first group lens to the fourth group lens, the first lens group, the second lens group, and the third lens group constituting the zoom lens system are supported by the lens barrel of the lens barrel so as to be movable in the optical axis direction. . Further, the fourth group lens which is a focusing lens is supported so as to be able to advance and retreat in the optical axis direction with respect to the base member. Specifically, the guide shaft is inserted into an arm portion extending outward from the fourth group lens frame holding the fourth group lens, and is engaged with a feed screw movable in the optical axis direction, and this feed screw is used for focusing. The fourth group lens frame is driven forward and backward by being rotated by the driving force of the motor.

JP 2009-133944 A JP 2010-175747 A

  Incidentally, many digital cameras have an image blur correction mechanism for correcting image blur due to hand movement or the like during shooting. As an image blur correction method, optical image blur correction in which correction is performed by moving an image sensor is known. In order to perform this optical image blur correction, an image blur correction device for moving the image sensor is provided, and the image sensor is mounted on the image blur correction device.

  However, since the focus drive unit that drives the focusing lens interferes with the image blur correction device, the size of the imaging device is restricted. For example, in the imaging apparatus of Patent Document 1, a lead screw of a focus drive unit and a motor disposed under the lead screw project to the imaging element side. For this reason, when an image blur correction device is provided, the motor must be arranged outside the image sensor when viewed in the optical axis direction so that the motor and the image blur correction device do not interfere with each other. It gets bigger.

  In the imaging device described in Patent Document 2, a lens barrel that can be expanded and contracted with a base member interposed therebetween and an image blur correction device are fixedly arranged. The focusing motor and the guide shaft are fixed at the outer peripheral portion of the fixed frame of the lens barrel, avoiding a position where the focusing motor and the guide shaft interfere with the image blur correction device on the back side. Even with this configuration, the diameter of the lens barrel cannot be reduced, and the motor and guide shaft are provided on the outer periphery of the fixed frame. There is room for improvement in that the device must be made larger to ensure it.

  Accordingly, an object of the present invention, which has been made paying attention to these points, is to provide a small-sized imaging device without causing interference between the focus driving unit and the image blur correction device.

The invention of an imaging apparatus according to claim 1 that achieves the above object is as follows:
A lens barrel holding an imaging lens system comprising a plurality of lenses including a focusing lens;
An imaging element that receives an optical image formed through the imaging lens system and generates image data;
An image blur correction device that performs an image blur correction operation by displacing the image sensor in a plane parallel to the light receiving surface of the image sensor;
The lens barrel includes a focus drive unit that drives the focusing lens to advance and retreat along the optical axis, and a part of the focus drive unit penetrates the image shake correction device so as not to interfere with the image shake correction device. and,
The image blur correction device includes a base member to which the lens barrel is fixed, a slider supported by the base member so as to be movable in a first direction orthogonal to the optical axis, and the optical axis and the slider by the slider. A sensor holding frame that holds the imaging device supported movably in a second direction orthogonal to the first direction, and a part of the focus drive unit is seen in the optical axis direction, It is characterized in that it passes through the outside of the movement area of the sensor holding frame in the slider area .

  The term “penetrating” as used herein refers to a state in which the image blur correction apparatus has an opening that penetrates in the optical axis direction, and a part of the focus drive unit is at least partially inserted into the opening. Means that That is, a part of the focus drive unit does not necessarily extend to the rear of the image blur correction device.

The invention according to claim 2 is the imaging apparatus according to claim 1,
The focus driving unit includes a focus motor that is a driving source of the focusing lens, and a part of the focus motor penetrates the image blur correction device.

  According to the present invention, the lens barrel includes a focusing lens and a focus driving unit that drives the focusing lens to advance and retreat along the optical axis, and a part of the focus driving unit interferes with the image blur correction device. Since the image blur correction device is penetrated so as not to interfere, the focus drive unit and the image blur correction device do not interfere with each other, and a small imaging device can be provided.

It is a disassembled perspective view which shows the structure of the principal part of the imaging unit containing the lens-barrel and sensor unit which comprise the imaging device which concerns on one embodiment of this invention. It is sectional drawing in the retracted state of the imaging unit shown in FIG. It is sectional drawing in the wide position of the imaging unit shown in FIG. It is sectional drawing in the tele position of the imaging unit shown in FIG. FIG. 2 is a cross-sectional view of a fourth group lens, a fourth group frame, and a focus drive unit of the imaging unit shown in FIG. 1. It is a rear view of the imaging unit shown in FIG. It is sectional drawing of the 4th group lens of the imaging unit which concerns on the modification of this invention, a 4th group frame, and a focus drive unit.

  Hereinafter, an imaging apparatus according to an embodiment of the present invention will be described with reference to the drawings.

  In the description of the present embodiment, the optical axis (imaging optical axis) of the imaging optical system in the lens barrel is represented by the symbol O. In the direction along the optical axis O (photographing optical axis direction), the subject side (object side) is defined as the front, and the direction in which each frame member in the lens barrel is directed forward is referred to as the feeding direction. On the other hand, in the direction along the optical axis O, the imaging side (image side) is the rear, and the direction in which each frame member heads backward is referred to as the retraction direction. Moreover, the rotation direction of each structural member in a lens barrel shall be represented by the rotation direction seen from the front side.

  The imaging apparatus according to the present embodiment uses a telescopic optical system, that is, a lens barrel. This lens barrel extends in a direction along the optical axis O, extends toward the front of the housing of the image pickup apparatus, and protrudes to perform a shooting operation, that is, in a use state in a mode waiting for the shooting operation. There are a shooting standby state (shooting enabled state) and a non-use state in which the lens barrel is not used for the shooting operation because it is stored in the housing of the imaging device by being shortened from the state of extending in the direction along the optical axis O. When the entire length of the lens barrel can be extended and retracted between the retracted state and it is in a shootable state, a plurality of frames are provided between the short focus position (wide end) and the long focus position (tele end). It has a telescopic mechanism that enables a zooming operation (zooming) by extending or retracting a member.

  First, the configuration of the lens barrel will be described with reference to FIGS.

  The lens barrel 1 is fixed to the base member 101 of the sensor unit 100 and is supported by the fixed frame 2 to be driven to rotate during zooming operation or retracting operation, and advances and retreats in the direction along the optical axis O. The cam frame 5 to be driven, the float key 6 that advances and retreats in the direction along the optical axis O together with the cam frame 5 in the rotation restricted state, and the guide frame 7 that advances and retracts along the optical axis O together with the cam frame 5 in the rotation restricted state. And a first group frame 12 holding the first group lens 21 that advances and retreats in the direction along the optical axis O by rotation of the cam frame 5 in the rotation restricted state, and a forward and backward movement in the direction along the optical axis O by rotation of the cam frame 5 in the rotation restricted state. The second group frame 11 that holds the second group lens 22, the third group frame 10 that holds the third group lens 23 that moves forward and backward in the direction along the optical axis O by the rotation of the cam frame 5 in a rotation-restricted state, and the shutter are supported. Shutter/ A group unit 8, which is retractable coupled in the direction along the optical axis O to the fixed frame 2, and a fourth group frame 13 which holds the fourth group lens (focusing lens) 24. Here, the first group lens 21, the second group lens 22, the third group lens 23, and the fourth group lens 24 constitute an imaging lens system.

  In this lens barrel 1, the cam frame 5 is positioned between the retracted state and the shootable state by rotation when the cam frame 5 moves between the rear moving end and the front moving end, and the optical axis O is in the shootable state. The first lens group 21, the second lens group 22, the third lens group 23, and the fourth lens group 24 are positioned in order from the object side to the image side, and further, the zooming effect is achieved by rotating the cam frame 5 at the front moving end. Is to be executed.

  The fixed frame 2 is formed in a cylindrical shape, and a plurality of inclined cam grooves formed in a direction inclined with respect to the optical axis O on the inner periphery thereof, and a circumferential groove formed in a direction along the circumference, Are connected to each other, and a plurality of rectilinear grooves 2b and 2c formed in the optical axis direction. A zoom drive unit 17 for performing a zooming operation of the photographing optical system is provided on the outer peripheral portion of the fixed frame 2, and a focus drive for performing a focusing operation of the photographing optical system is provided inside the fixed frame 2. A unit 18 is provided.

  The zoom drive unit 17 includes a zoom motor 17a that is a zoom drive source, a gear train (rotation transmission mechanism) 17b that transmits the driving force of the zoom motor 17a, a position sensor (not shown) that detects the position of the cam frame 5, and A long gear 17c and the like are included. Then, the zoom motor 17a drives the zoom optical system (the first lens group 21, the second lens group 22, and the third lens group 23) that contributes to the zooming operation in the photographing optical system of the lens barrel 1 in the direction along the optical axis O. In addition to performing a zooming operation, a retracting operation for driving the lens barrel 1 from the photographing enabled state to the retracted state is also performed. The long gear 17c of the zoom drive unit 17 is disposed in the gear housing portion 2d of the fixed frame 2 so that the rotation axis is parallel to the optical axis O, and rotates while being exposed to the inner peripheral portion of the fixed frame 2. It is supported freely.

  The focus drive unit 18 is screwed into a focus motor 18a that is a focus drive source arranged parallel to the optical axis O, a lead screw 18b that is formed integrally with a rotation shaft of the focus motor 18a, and a lead screw 18b. The nut 18c, and a position sensor (not shown) including a photo interrupter for detecting the origin position of the focusing optical system (fourth group lens 24) that contributes to the focusing operation of the photographing optical system of the lens barrel 1 are included. Yes. Then, the focus motor 18a drives the fourth group lens 24 in a direction along the optical axis O. The detailed configuration and operation of the focus drive unit 18 will be described later.

  The cam frame 5 is formed in a cylindrical shape, and is fitted in the inner peripheral portion of the fixed frame 2 in a state where the cam frame 5 can rotate and advance and retract. A plurality of cam followers 5 a that are slidably fitted into a plurality of cam grooves 2 a of the fixed frame 2 and a gear portion 5 b that meshes with the long gear 17 c of the zoom drive unit 17 are formed at the rear peripheral portion of the cam frame 5. ing.

  As described above, the cam follower 5a of the cam frame 5 is slidably fitted into the cam groove 2a of the fixed frame 2, and the gear portion 5b is engaged with the long gear 17c. Therefore, when the zoom motor 17a of the zoom drive unit 17 is driven and the long gear 17c is rotationally driven, the driving force is transmitted to the cam frame 5 via the gear portion 5b so that the cam frame 5 is rotated. It has become. When the cam frame 5 rotates in this manner, the cam follower 5a of the cam frame 5 moves along the inclined cam groove portion of the inclined cam groove 2a of the fixed frame 2, so that the cam frame 5 is in a retracted position while rotating. From the (rear moving end), it is advanced forward to the wide end (forward moving end) which is the short focal position in the photographing enabled state. When the lens barrel 1 is in a photographing enabled state, the cam frame 5 has a cam follower 5a and a cam groove during a zooming operation from the wide end that is the short focus position to the tele end that is the long focus position. The circumferential groove 2a is driven only in the rotational direction at the forward moving end without moving forward and backward in the direction along the optical axis O.

  Further, a first group cam groove 5c is formed in the outer peripheral portion of the cam frame 5 in a direction inclined with respect to the optical axis O, and two groups are formed in the inner peripheral portion in a direction inclined with respect to the optical axis O. A cam groove 5d and a third group cam groove 5e are formed.

  The float key 6 is formed in a cylindrical shape, and is fitted in the inner peripheral portion of the cam frame 5 so as to be relatively rotatable. A guide protrusion 6 a that fits into the rectilinear groove 2 b of the fixed frame 2 projects outwardly from the outer peripheral portion of the rear end of the float key 6. As a result, the float key 6 can move forward and backward in the direction along the optical axis O together with the cam frame 5 in a state in which the rotation is restricted by the fixed frame 2.

  The float key 6 is disposed so as to be fitted into the inner peripheral portion of the cam frame 5 in a state where the bayonet protrusion 6b is fitted into the outer peripheral groove 5g of the circular recess provided in the flange portion 5f of the cam frame 5. Yes. As a result, the float key 6 can be rotated relative to the cam frame 5 and is bayonet-coupled so as not to move forward and backward relative to the cam frame 5 in the direction along the optical axis O. .

  In addition, the float key 6 has a second group rectilinear groove 6c and a third group rectilinear groove 6d formed so as to penetrate the inner and outer peripheries in the direction along the optical axis O.

  Further, the guide projection 11a of the second group frame 11 is fitted in the second group straight advance groove 6c of the float key 6, and the guide projection 10b of the third group unit 10 is fitted in the third group straight advance groove 6d. Thereby, the float key 6 supports the second group frame 11 and the shutter / third group unit 8 so as to be able to advance and retreat, and restricts the rotation.

  The guide frame 7 is formed in a cylindrical shape, and has a bayonet protrusion (not shown) that fits into a coupling groove (not shown) of the cam frame 5 on the inner periphery of the rear end. In addition, a rectilinear groove 7 b in which a cam follower 12 a formed on the rear outer peripheral portion of the group frame 12 is fitted is formed in the inner peripheral portion of the guide frame 7 in a direction along the optical axis O.

  The guide frame 7 is disposed in a bayonet connection with the cam frame 5 in a state where the guide frame 7 is fitted into the inner peripheral portion of the fixed frame 2. At this time, the guide protrusion 7 a of the guide frame 7 is fitted into the rectilinear groove 2 c of the fixed frame 2. As a result, the guide frame 7 moves integrally with the cam frame 5 in the direction along the optical axis O in a state where the rotation is restricted with respect to the fixed frame 2, as with the float key 6. ing.

  The second group frame 11 is formed in a cylindrical shape and is arranged in a state of being fitted into the inner peripheral portion of the float key 6. A second group lens 22 is held at a substantially central portion of the second group frame 11, a guide projection 11a projecting outward on the outer peripheral portion, and projecting outward on the guide projection 11a. Cam follower 11b.

  The guide projection 11a is fitted into the second group straight advance groove 6c of the float key 6, and the cam follower 11b is inserted through the second group straight advance groove 6c, and the second group cam groove of the cam frame 5 provided outside thereof. 5d is slidably fitted. As a result, the second group frame 11 is driven to advance and retract by the rotation of the cam frame 5 while being restricted in rotation by the float key 6.

  The second group frame 11 is configured such that when the cam frame 5 is positioned at the rearward movement end, a part of the image side is fitted into the inner peripheral side of the shutter frame 30 together with a part of the lens on the image side. Yes.

  The first group frame 12 is formed in a cylindrical shape, and is arranged in a state of being fitted between the cam frame 5 and the guide frame 7. A first group lens 21 is held on the object side of the first group frame 12. In addition, a plurality (for example, three inward) of the inner peripheral portion of the first group frame 12 is formed at equal intervals in the inner peripheral direction so as to fit into the first group cam grooves 5c formed on the outer peripheral portion of the cam frame 5. Cam followers (not shown).

  Further, as described above, the cam follower 12 a formed on the outer peripheral portion of the rear end of the first group frame 12 is fitted into the rectilinear groove 7 b formed on the inner peripheral portion of the guide frame 7, and is formed on the inner peripheral portion of the first group frame 12. The formed cam follower is fitted into a group cam groove 5 c formed on the outer periphery of the cam frame 5. As a result, the group frame 12 is driven to advance and retract by the rotation of the cam frame 5 while being restricted in rotation by the guide frame 7.

  The shutter / third group unit 8 includes a shutter frame 30 that holds a shutter mechanism, and a third group frame 10 that holds a third group lens 23 on the rear side of the shutter frame 30.

  The shutter frame 30 is configured in such a manner that a substantially circular plate member having an opening at a substantially central portion holds a shutter mechanism including a shutter blade that opens and closes the central opening and a shutter actuator that rotationally drives the shutter blade. It is configured.

  The third group frame 10 has a cylindrical holding portion 10 a that holds the third group lens 23, and the holding portion 10 a is fixed to the shutter frame 30 in a state of being fitted into the shutter frame 30 from the rear side of the shutter frame 30. Has been. Further, the third group frame 10 is provided with a plurality of (for example, three) guide protrusions 10b outwardly at equal intervals in the outer peripheral direction on the front outer periphery, and the guide protrusions 10b further include Cam followers 10c are provided so as to project outward.

  The third group frame 10 is arranged in a state of being fitted inside the float key 6, the guide projection 10 b is fitted into the third group straight advance groove 6 d of the float key 6, and the cam follower 10 c is penetrated through the cam group 10 c. 5 is inserted into the third group cam groove 5e. Accordingly, the third group rectilinear frame 30 is driven to advance and retract by the cam frame 5 in a state in which the rotation is restricted by the float key 6.

  A coil spring 35 is disposed between the second group frame 11 and the shutter / third group unit 8. As a result, the second group frame 11 and the shutter / third group unit 8 are biased in a direction away from each other. The coil spring 35 is inserted so that one end thereof is fitted to the inner peripheral portion of the shutter frame 30 of the shutter / third group unit 8, and the other end is fitted to the outer peripheral portion of the lens holder portion of the second group frame 11. Has been inserted.

  A neutral density filter (ND filter) 40 is attached to the image side of the third group lens. By disposing on the image side of the third lens group, a smaller ND filter can be used as compared with the case where it is disposed between other parts, for example, between the second lens group 22 and the third lens group 23. The ND filter 40 may not be provided.

  The fourth group frame 13 is a substantially disk-shaped frame member having a circular opening at the center for holding the fourth group lens 24. The fourth group frame 13 is supported by the focus drive unit 18 so as to be movable back and forth in the optical axis direction inside the fixed frame 2. The focus drive unit 18 is coupled to the fixed frame 2 via an LD main body 19 and a base member 101 which are members for fixing the focus drive unit.

  Next, a mechanism for supporting and driving the fourth group frame 13 by the focus driving unit 18 will be described. 5 is a cross-sectional view including the fourth group lens 24, the fourth group frame 13, and the focus drive unit 18 of the imaging unit shown in FIG. This figure is a cross-sectional view of a cross section that simultaneously passes through the central axes of a lead screw 18c and a focus guide shaft 18f described later.

  The focus motor 18a has a support frame 18d formed integrally with the housing of the focus motor 18a. The support frame 18d extends from the side of the housing of the focus motor 18a in the optical axis direction, and has a shape in which the tip is bent toward the rotation axis of the motor. The front end portion of the support frame 18d rotatably supports the front end portion of the lead screw 18b formed integrally with the rotation shaft of the focus motor 18a. Therefore, the lead screw 18b is supported at both ends by the focus motor 18a and the tip of the support frame 18d. By doing in this way, generation | occurrence | production of the vibration accompanying rotation of the lead screw 18b can be prevented, and the focus drive unit 18 can be silenced. The support frame 18d is provided with a screw hole, and is fixed to the LD main body 19 by a focus motor mounting screw 18e.

  Further, a nut 18c is screwed to the lead screw 18b in a state where the rotation is restricted by the support frame 18d. Therefore, when the focus motor 18a is driven, the lead screw 18b rotates, and the nut 18c moves forward and backward along the lead screw in accordance with this rotation.

  In addition, a main focus guide shaft 18f extending in the optical axis direction is inserted into the LD main body 19 at a position close to the focus motor 18a, and a sub-extension extending in the optical axis direction at a position away from the focus motor. A focus guide shaft 18h (see FIG. 1) is inserted. Since the main focus guide shaft 18f and the sub focus guide shaft 18h penetrate the fourth group frame 13 slidably, the fourth group frame 13 extends along the main focus guide shaft 18f and the sub focus guide shaft 18h in the optical axis direction. Can be moved to. Further, since the sub focus guide shaft 18h is provided in addition to the main focus guide shaft 18f, the fourth group frame 13 is prevented from rotating around the main focus guide shaft 18f.

  Further, the lead screw 18b passes through the outer periphery of the fourth group frame 13 between the focus motor 18a and the nut 18c. On the other hand, an urging spring is wound around the main focus guide shaft 18f between the LD main body 19 and the fourth group frame 13, and the LD main body 19 and the fourth group frame 13 are urged away from each other. . As a result, the fourth group frame 13 is always in contact with the rear surface of the nut 18c.

  The LD main body 19 is connected to an FPC board 117 including a drive signal line to the focus driving focus motor 18a and an origin position detection signal line to the control circuit of the imaging apparatus (see FIGS. 2 to 4). .

  Thereby, when the lead screw 18b is rotated by the driving force of the focus motor 18a of the focus drive unit 18, the nut 18c is driven forward and backward along the lead screw 18b. When the nut 18c is driven back and forth, the fourth group frame 13 in contact with the rear surface of the nut 18c is driven back and forth in the direction along the focus guide shafts 18f and 18h, that is, the direction along the optical axis O, and photography is possible. It is adjusted to an appropriate focusing position when it is in the state, and is positioned at a predetermined retracted position during the retracting operation.

  In FIG. 5, the rear end portions of the focus motor 18a and the main focus guide shaft 18f and a part of the LD main body 19 fitted therewith are the lens surfaces on the rear side (image side) of the fourth group lens 24 at the retracted position. Protrudes backwards. As will be described later, these portions are disposed so as to penetrate the camera shake correction device. On the other hand, the sub focus guide shaft 18h does not penetrate the camera shake correction device 105.

  Next, the configuration of the sensor unit 100 will be described with reference to FIG.

  The sensor unit 100 is a unit having an image blur correction device 105 that performs image blur correction and an image sensor 110 that generates image data. The image blur correction device 105 includes a base member 101, Y guide shafts 109 and 111, a Y feed screw 112 supported by the base member 101 extending in the Y direction (first direction), and the X direction (second direction). X feed screw 113 extending and supported in the direction), slider 114 supported movably in the Y direction by the Y guide shaft 111 and Y feed screw 112, and extending and supported by the slider 114 in the X direction. X guide shafts 115 and 116, a sensor holding frame 119 supported by the X feed screw 113 and the X guide shafts 115 and 116 so as to be slidable in the X direction, and an optical low-pass filter 118 attached to the sensor holding frame 119 ( 2 to 4) and the image sensor 110 (see FIGS. 1 to 4), the Y motor (first motor) 120 and the X motor (second module) supported by the base member 101. Motor) and a 130 (see FIG. 1) (see FIG. 1).

  Note that the X direction and the Y direction are directions orthogonal to each other and orthogonal to the optical axis O, and are directions along the horizontal direction (X direction) and the vertical direction (Y direction) of the image sensor 110.

  The Y motor 120 is a stepping motor that drives the slider 114 in the Y direction by rotating the Y feed screw 112 via the gear train 121. The X motor 130 is a stepping motor that rotates the X feed screw 113 via the gear train 131 to drive the sensor holding frame 119 in the X direction. An FPC (not shown) connected to the base circuit board is connected to the Y motor 120 and the X motor 130 and driven. Accordingly, the sensor holding frame 119 is driven along a plane parallel to the light receiving surface of the image sensor 110 by the Y motor 120 and the X motor 130, and an optical image formed on the image sensor 110 via the lens barrel 1. Image misalignment is corrected.

  Note that compression coil springs 122 and 132 are wound around the Y guide shaft 111 and the X guide shaft 116, respectively. Further, tension coil springs 123 and 133 are suspended between the base member 101, the slider 114, and the sensor holding frame 119, respectively. As a result, the slider 114 and the sensor holding frame 119 are each biased to the origin position.

  The image sensor 110 is connected to the FPC 141 and mounted on the sensor holding frame 119. A heat radiating plate 142 is attached to the sensor holding frame 119 on the back side of the image sensor 110 so as to sandwich the FPC 141.

  Here, the base member 101 of the image blur correction device 105 is a combination of a semi-circular shape and a rectangular shape so that a straight portion of the semi-circular shape matches one side of the rectangular shape as viewed from the lens barrel 1 side. It has a shape. Of the two corners of the rectangular portion, the first corner 151 includes the first drive unit 161 including the Y motor 120 and the gear train 121, and the second corner 152, which is the other corner, has an X A second drive unit 162 including a motor 130 and a gear train 131 is mounted.

  Further, the arc of the semicircular portion of the base member 101 extends along the outer periphery of the rear end portion of the fixed frame 2, and the outside of the opposite base member 101 via the second corner 152 and the optical axis O, that is, the fixed frame 2. A zoom drive unit 17 is disposed outside the lens. The zoom motor 17a of the zoom drive unit 17 is connected to a long gear 17c in the gear housing portion 2d of the fixed frame 2 via a gear train 17b (see FIG. 1).

  A focus drive unit 18 is provided inside the fixed frame 2 at a position where it does not interfere with the optical system. The focus motor 18a has a rear end fixed to the LD main body 19 with the motor shaft facing forward. It protrudes and penetrates into the blur correction unit 105. Further, the rear end portion of the main focus guide shaft 18 f also penetrates the image blur correction device 105 while being fixed to the LD main body 19. The focus motor 18a and the main focus guide shaft 18f are provided with a notch portion between the heat sink 142 and the slider 114 so that the sensor unit 100 has an opening when viewed in the optical axis direction. The part is penetrated in the direction along the optical axis. That is, the focus motor 18a and the main focus guide shaft 18f pass through the gap between the slider 114 and the sensor holding frame 119. Further, there is a gap between the focus motor 18a and the main focus guide shaft 18f, the heat radiating plate 142, and the slider 114, and when the heat radiating plate 142 and the slider 114 move in the X direction and / or the Y direction during image blur correction. It is designed not to touch. With such a structure, the outer diameter of the fixed frame can be reduced. Therefore, the strobe and the tripod screw can be brought closer to the fixed frame, and the imaging apparatus can be downsized. Further, when the lens barrel 1 and the sensor unit 100 are assembled, the focus driving unit 18 and the image blur correction device 105 do not interfere with each other, and the focus motor 18a and the main focus guide are provided from the rear of the image blur correction device 105. Since the position of the shaft 18f can be visually confirmed, assembly is easy.

  The FPC 141 to which the image sensor 110 is connected extends from the image sensor 110 in the X direction on the back side of the base member 101. The FPC 141 is connected to a base circuit board so that an image captured by the image sensor 110 is displayed on a display device such as a liquid crystal panel (not shown) and recorded on a recording medium.

  Hereinafter, the operation of the imaging apparatus according to the present embodiment configured as described above will be described.

  First, in order to make the imaging device ready for photographing by starting the imaging device or the like, the cam frame 5 is rotated clockwise by the zoom drive unit 17, and the lens barrel 1 is moved forward from the retracted state (backward movement end). It is extended to the moving end. When the cam frame 5 is positioned at the front moving end and becomes the wide end which is the short focal position, as shown in FIG. 3, each frame member moves in the direction along the optical axis O toward the front. Thus, the lens barrel 1 is in an extended state as a whole.

  Next, at the time of zoom adjustment, the positions of the first group frame, the second group frame, and the third group frame are adjusted so that the cam frame 5 is rotated at the forward movement end and a desired image magnification is obtained. For example, at the telephoto end that is the long focal position, as shown in FIG. 4, the lens barrel 1 is fully extended, and the positions of the second group frame and the third group frame are adjusted accordingly. .

  Further, at the time of focus adjustment, the focus drive unit 18 is driven to drive the fourth group frame 13 forward and backward in the optical axis direction, and the position of the fourth group lens 24 in the optical axis direction is adjusted. As a result, it is possible to capture an image whose focus is adjusted at a desired image magnification.

  Further, at the time of imaging, the direction of camera shake is detected by a sensor such as an angular velocity sensor (not shown), and the first drive unit 161 and the second drive unit 162 of the image blur correction device 105 are driven, whereby the sensor holding frame 119 is prevented from shaking. Drive in the opposite direction to the direction to correct image blur. At this time, the focus motor 18a and the main focus guide shaft 18f pass through the image blur correction device 105. However, the focus motor 18a and the focus guide shaft 18f and the image blur correction device are viewed from the optical axis direction. Therefore, the image blur correction is not hindered.

  Further, since the focus motor 18a and the main focus guide shaft 18f pass through the gap between the slider 114 of the image blur correction device 105 and the sensor holding frame 119, the focus motor 18a and the main focus guide shaft 18f are It is not necessary to arrange the image blur correction device 105 while avoiding the position on the back side of the position where the image blur correction device 105 is arranged. For this reason, it is possible to reduce the diameter of the fixed frame 2. As a result, a strobe, a tripod screw, and the like can be disposed in the vicinity of the fixed frame 2 of the imaging apparatus body, and the entire apparatus can be reduced in size.

  Further, when the photographing enabled state is ended, for example, when the power of the imaging device is turned off, the cam frame 5 of the lens barrel 1 is rotated counterclockwise, and each frame member is moved along with the rotation of the cam frame 5. It moves to the rear along the optical axis O to be in the retracted state shown in FIG. At that time, the focus motor 18a and the main focus guide shaft 18f are housed by effectively using a dead space formed in the lens barrel behind the first group lens 21 having the largest diameter.

  As described above, according to the present embodiment, the lens barrel 1 includes the fourth group lens 24 that is a focusing lens and the focus drive unit 18 that drives the fourth group lens 24 to advance and retract along the optical axis. Since the focus motor 18a and the main focus guide shaft 18f, which are part of the drive unit 18, pass through the image blur correction device 105 so as not to interfere with the image blur correction device 105, the diameter of the fixed frame 2 is reduced. The apparatus main body can be reduced in size.

  Note that the image blur correction device 105 that penetrates is not limited to the focus motor 18a and the main focus guide shaft 18f, but may be a component of the sub guide shaft 18h and other focus drive units 18. Alternatively, only the focus motor 18a or the main focus guide shaft 18f may pass through the image blur correction device 105. In particular, when the focus motor 18a, which is a relatively large member, passes through the image blur correction device 105, it is easy to dispose the lens and the lens frame in the retracted state, and the imaging device 1 can be downsized.

  Further, since the focus motor 18a and the main focus guide shaft 18f pass through the outside of the movement region of the sensor holding frame 119 in the region of the slider 114 of the image blur correction device 105 when viewed in the optical axis direction. It becomes possible to arrange the focus drive unit 18 at a position closer to the image sensor 110. Therefore, the lens barrel 1 and the entire imaging apparatus can be further downsized.

  Note that the present invention is not limited to the above-described embodiment, and various modifications or changes can be made without departing from the spirit of the invention. For example, the lens barrel according to the present invention is not limited to a sensor unit having a CCD, but can be combined with a sensor unit having a CMOS to constitute an imaging device, or applied to a camera using a silver salt film. You can also. Further, as the X motor and Y motor of the image blur correction device, a voice coil motor (VCM) can be used in addition to the stepping motor.

  Further, the focus drive unit is not limited to a configuration in which a part of the focus motor passes through the image blur correction device. For example, as shown in FIG. 7, the focus motor 18a, the lead screw 18b, and the support frame 18d are arranged in the front-rear direction. The tip of the support frame 18d may be configured to pass through the image blur correction device correction device. The focus drive unit may be configured to be movable in the optical axis direction with respect to the image blur correction device. In this case, when the lens barrel is in a predetermined state such as a retracted state, the focus drive unit Are partially penetrating the image blur correction device. By configuring the focus drive unit as shown in FIG. 7, the support frame is often smaller than the focus motor, so that the hindrance to the moving amount of the movable portion of the image blur correction device can be minimized. In addition, since the movement amount of the image blur correction device movable portion in the camera use state is not hindered, the movement amount between the focus and the image blur correction device can be secured, and the lens mechanism can be further downsized.

DESCRIPTION OF SYMBOLS 1 Lens barrel 2 Fixed frame 5 Cam frame 6 Float key 7 Guide frame 8 Shutter / third group unit 10 Third group frame 11 Second group frame 12 First group frame 13 Fourth group frame 17 Zoom drive unit 18 Focus drive unit 21 First group lens 22 Two Group lens 23 Third group lens 24 Fourth group lens 30 Shutter frame 35 Coil spring 100 Sensor unit 101 Base member 105 Image blur correction device 110 Imaging element 114 Slider 115 Sensor holding frame 117 FPC
119 Sensor holding frame 120 Y motor (first motor)
130 X motor (second motor)
161 First drive unit 162 Second drive unit O Optical axis

Claims (2)

A lens barrel holding an imaging lens system comprising a plurality of lenses including a focusing lens;
An imaging element that receives an optical image formed through the imaging lens system and generates image data;
An image blur correction device that performs an image blur correction operation by displacing the image sensor in a plane parallel to the light receiving surface of the image sensor;
The lens barrel includes a focus drive unit that drives the focusing lens to advance and retreat along the optical axis, and a part of the focus drive unit penetrates the image shake correction device so as not to interfere with the image shake correction device. and,
The image blur correction device includes a base member to which the lens barrel is fixed, a slider supported by the base member so as to be movable in a first direction orthogonal to the optical axis, and the optical axis and the slider by the slider. A sensor holding frame that holds the imaging device supported movably in a second direction orthogonal to the first direction, and a part of the focus drive unit is seen in the optical axis direction, An imaging apparatus characterized in that it passes through the outside of the movement area of the sensor holding frame in the area of the slider .   The imaging apparatus according to claim 1, wherein the focus driving unit includes a focus motor that is a driving source of the focusing lens, and a part of the focus motor passes through the image blur correction apparatus.

Images