JP5379498B2 - Lens barrel and electronic camera using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel that reduces the axial dimension thereof when collapsed, thins a camera housing, and improves the yield during manufacturing, and an electronic camera using the lens barrel. <P>SOLUTION: This lens barrel includes a fixed frame 2, a rotation frame 3, a moving frame 4 moving in the optical axis direction with the rotation frame 3 in the rotation restriction state, a cam frame 5 that rotates with the rotation frame 3 and moves relatively, a rectilinear guide frame 6 and guide frame 7 moving with the cam frame 5 in the rotation restriction state, a shutter/three-group unit 8 for supporting a first-group frame 12 for holding a first-group lens 21 moved by the rotation of the cam frame 5 in the rotation restriction state, a second-group frame 11 for holding a second-group lens 22, and a third-group frame 10 for holding a third-group lens 23, and a fourth-group frame 13 for holding a forth-group lens 24 movably supported by the fixed frame 2. The positioning of collapsed state and photographable state is executed by rotation when the rotation frame 3 moves between a backward moving end and a forward moving end, and variable power action is performed by constant position rotation of the rotation frame 3 at the forward moving end. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a lens barrel and an electronic camera using the lens barrel.

  Conventionally, as a lens barrel that is applied to a camera or the like for taking a picture, a shootable state that extends in the optical axis direction and protrudes toward the front surface of the camera housing to which the lens barrel is applied; In addition, a configuration in which the entire length is configured to be retractable between a retracted state that is shortened in the optical axis direction and stored in the camera casing in comparison with the photographing enabled state has been put into practical use and widely used. .

  Such a retractable lens barrel is generally applied in a retracted state by shortening the length of the lens barrel by retracting a part of the lens group constituting the photographing optical system from the photographing optical path. Devices such as cameras are made thinner to improve portability (see, for example, Patent Document 1).

  The lens barrel disclosed in Patent Document 1 includes a fixed frame coupled to a sensor unit having an image sensor, a rotating frame supported by the fixed frame and driven to move forward and backward during zooming and retracting driving, and in a rotation-restricted state. A moving frame that moves forward and backward together with the rotating frame, a cam frame that rotates and moves together with the rotating frame, a straight guide frame that moves forward and backward together with the cam frame in the rotation restricted state, and a shutter / three driven by the rotating frame in the rotation restricted state It has a group unit, a second group frame and a first group frame that are respectively driven back and forth by a cam frame in a rotation restricted state, and a fourth group frame that is driven back and forth during focusing and retracting driving. Then, the first group lens and the second group lens are held in the first group frame and the second group frame, respectively, and the third group lens (retractable lens) is held in the third group frame which is a retracting frame provided in the shutter / third group unit. A four-group lens that is a focusing lens is held in the frame.

  When the rotating frame is rotated from the retracted state, the lens barrel is rotated to the wide position where the photographing can be performed while the rotating frame and the cam frame are rotated, and the first group frame, the second group frame, and the shutter / third group unit are in a rotation restricted state. To the wide position where you can shoot. When the rotating frame is further rotated from this wide position, the rotating frame rotates at a fixed position without moving back and forth, the cam frame rotates, and the first group frame, second group frame and shutter / third group unit are restricted in rotation. In the state, each is extended to the tele position.

JP 2008-46504 A

  However, in the lens barrel disclosed in Patent Document 1, the shutter / third group unit having the third group lens is advanced and retracted by the rotating frame, and the first group frame is held by the cam frame advanced and retracted by the rotating frame. The second group frame holding the second group lens is advanced and retracted. That is, the rotating frame is formed with a cam groove for advancing and retracting the shutter / third group unit and a cam groove for advancing and retracting the cam frame, and for holding the extended cam frame at the tip. Space is reserved.

  For this reason, for the rotating frame, a tip end region for holding the extended cam frame is secured, and a cam groove for moving the shutter / third group unit forward and backward is formed in a region excluding the tip end region. The axial dimension becomes longer, the length of the lens barrel in the retracted state becomes longer, and the applied device such as a camera cannot be sufficiently thinned. Further, depending on the combination of the rotating frame and the cam frame, the processing accuracy of the cam groove for moving the shutter / third group unit formed on the rotating frame forward and backward, and the first group frame and the second group frame formed on the cam frame are advanced and retracted, respectively. Depending on the machining accuracy of the cam groove, the required optical characteristics cannot be obtained, and there is a concern that the yield of the product will decrease.

  Accordingly, an object of the present invention made in view of such a point is that the axial dimension of the lens barrel when retracted can be reduced, the camera housing can be made thin when applied to a camera, and the yield during manufacture is It is an object to provide a lens barrel and an electronic camera using the same.

The invention of the lens barrel according to claim 1, which achieves the above object, is a retractable lens barrel,
A fixed frame,
Supported by the fixed frame, can move in the photographic optical axis direction while rotating between a forward moving end and a backward moving end respectively defined in the photographic optical axis direction, and is rotated at a fixed position at the forward moving end. Possible rotation frame,
A moving frame that moves in the photographing optical axis direction together with the rotating frame in a rotation-restricted state;
A cam frame that rotates with the rotating frame and moves in the direction of the photographic optical axis relative to the rotating frame;
A rectilinear guide frame that moves in the photographing optical axis direction together with the cam frame in a rotation restricted state;
A guide frame that moves in the photographing optical axis direction together with the cam frame in a rotation restricted state;
A group frame holding a group lens having a positive refractive power that moves in the direction of the photographing optical axis by rotation of the cam frame in a rotation restricted state;
A second group frame holding a second group lens having a negative refractive power that moves in the direction of the photographing optical axis by rotation of the cam frame in a rotation restricted state;
A third group frame that holds a third group lens having positive refractive power that moves in the photographing optical axis direction by rotation of the cam frame in a rotation restricted state, and a shutter / third group unit that supports the shutter;
A four-group frame holding a four-group lens having positive refractive power supported so as to be movable in the photographing optical axis direction on the fixed frame, and
The rotating frame is disposed on the inner peripheral side of the fixed frame,
The moving frame is rotationally restricted by the fixed frame and arranged on the inner peripheral side of the rotating frame,
The guide frame is rotationally restricted by the moving frame and arranged on the inner peripheral side of the moving frame,
The group frame is restricted by the guide frame and is arranged on the inner peripheral side of the guide frame,
The cam frame is disposed on the inner peripheral side of the group frame,
The rectilinear guide frame is disposed on the inner peripheral side of the cam frame by being restricted in rotation by the moving frame,
The second group frame and the shutter / third group unit are disposed on the inner peripheral side of the rectilinear guide frame by being restricted in rotation by the rectilinear guide frame,
By positioning the rotating frame between the rear moving end and the front moving end, positioning between the retracted state and the shootable state is performed, and in the shootable state, from the object side of the photographic optical axis. In order on the image side, the first group lens, the second group lens, the third group lens, and the fourth group lens are positioned, and a zooming action is performed by a fixed position rotation of the rotary frame at the front moving end ,
When zooming from the wide position, which is the short focus position, to the tele position, which is the long focus position, the first group lens moves to the object side, the second group lens moves to the object side, and then moves to the image side. The group lens moves to the object side, the fourth group lens moves to the object side after moving to the image side, and then moves to the image side .

The invention according to claim 2 is the lens barrel according to claim 1 ,
The second group lens has at least two lenses of a second group object side lens and a second group image side lens having a smaller outer shape than the second group object side lens ,
The fourth group lens is made outline smaller lens than the second group object side lens,
The third group frame further holds an aperture stop. In the photographing enabled state, the brightness stop and the third group lens are positioned on the photographing optical axis, and in the retracted state, the brightness stop and the three group lens are positioned. When the group lens is viewed from the direction orthogonal to the photographing optical axis, the shutter / third group unit is swung so as to be retracted between the image side end of the second group image side lens and the image side end of the fourth group lens. Configured to be movable,
It is characterized by this.

The invention according to claim 3 is the lens barrel according to claim 1 or 2 ,
A conical coil spring disposed between the second group frame and the shutter / third group unit and biasing the second group frame and the shutter / third group unit in a direction away from each other;
The large-diameter end of the conical coil spring is bent inward, and the small-diameter end is bent outward.
It is characterized by this.

The invention according to claim 4 is the lens barrel according to any one of claims 1 to 3 ,
The fourth group lens and the fourth group frame have a shape having a cut portion corresponding to a part of the outer shape of the third group frame on the outer periphery,
The third group frame is configured to be retracted to the cut portion in the retracted state.
It is characterized by this.

The invention according to claim 5 is the lens barrel according to any one of claims 1 to 4 ,
A focus motor is provided on the outer periphery of the fixed frame,
The fourth group frame is provided with a short arm portion and a long arm portion protruding in a direction orthogonal to the photographing optical axis,
The tip of the short arm is engaged with a rectilinear groove formed on the inner peripheral surface of the fixed frame so as to extend in parallel with the photographing optical axis,
The distal end portion of the long arm portion is provided to extend in parallel to the imaging optical axis on the fixed frame, and is engaged with a rotation shaft coupled to the focus motor via a rotation transmission mechanism,
The fourth group frame is configured to move in the photographing optical axis direction by rotating the rotation shaft via the rotation transmission mechanism by the focus motor.
It is characterized by this.

Furthermore, the invention of an electronic camera according to claim 6 that achieves the above object is as follows:
The lens barrel according to any one of claims 1 to 5 ,
Arranged on the image side of the lens barrel and generates image data by receiving an optical image formed through the first group lens, the second group lens, the third group lens, and the fourth group lens in the photographing enabled state. An image sensor;
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;
It is characterized by having.

  According to the present invention, in the telescopic lens barrel, the first group frame, the second group frame, and the shutter / third group unit can be moved in the direction of the photographing optical axis by rotating the cam frame. The axial dimension of the rotating frame that moves relatively in the direction of the optical axis of the image can be reduced, thereby reducing the axial dimension of the lens barrel when retracted, and the camera housing is thin when applied to a camera. Can be In addition, since the first frame, the second group frame, and the shutter / third group unit are moved in the direction of the photographing optical axis by the cam frame, the yield at the time of manufacturing the lens barrel can be improved.

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 electronic camera which concerns on one embodiment of this invention. It is the figure which looked at the shutter / third group unit shown in FIG. 1 from back. It is a perspective view of the conical coil spring 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. It is sectional drawing in the retracted state of the imaging unit shown in FIG. It is a front view of the imaging unit shown in FIG. It is a right side surface of the imaging unit shown in FIG. It is a bottom face of the imaging unit shown in FIG. It is a back surface of the imaging unit shown in FIG. It is the sectional view on the AA line of FIG.

  Hereinafter, as an embodiment of the present invention, a case where the present invention is applied to an electronic camera will be described as an example with reference to FIGS.

  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 electronic camera of the present embodiment uses a telescopic optical system, that is, a lens barrel. The lens barrel extends in a direction along the optical axis O, extends toward the front of the housing of the electronic camera, and protrudes to perform a photographing operation, that is, in a state of use in a state of waiting for the photographing 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 electronic camera by being shortened from the state extended 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 position) and the long focus position (tele position). 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.

  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. A rotating frame 3 that is driven, a moving frame 4 that moves forward and backward together with the rotating frame 3 in a rotation-restricted state, and a cam that rotates together with the rotating frame 3 and moves forward and backward relative to the rotating frame 3 along the optical axis O. A frame 5, a rectilinear guide frame 6 that advances and retreats in the direction along the optical axis O together with the cam frame 5 in the rotation restricted state, a guide frame 7 that advances and retreats in the direction along the optical axis O together with the cam frame 5 in the rotation restricted state, and rotation A first group frame 12 holding the first group lens 21 that advances and retracts in the direction along the optical axis O by rotation of the cam frame 5 in the restricted state, and two groups that advance and retract in the direction along the optical axis O by rotation of the cam frame 5 in the restricted state. Two groups holding the lens 22 11, 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 the rotation restricted state, the shutter / third group unit 8 that supports the shutter, and the fixed frame 2. And a fourth group frame 13 holding a fourth group lens 24 supported so as to be able to advance and retreat in a direction along the optical axis O.

  The lens barrel 1 is positioned between the retracted state and the shootable state by the rotation of the rotary frame 3 when it moves between the rearward moving end and the forwardly moving end. 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 the zooming action is achieved by the rotation of the rotating frame 3 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 (see FIG. 4 and FIG. 5 for 2c) formed in the optical axis direction. A zooming unit 17 for performing a zooming operation of the photographing optical system and a focus unit 18 for performing a focusing operation of the photographing optical system are disposed on the outer periphery of the fixed frame 2.

  As shown in FIGS. 7 and 8, the zooming unit 17 is a zoom motor 17a that is a zoom drive source arranged orthogonal to the optical axis O, and a gear train (rotation transmission mechanism) that transmits the driving force of the zoom motor 17a. 17b, a position sensor 17c for detecting the position of the rotary frame 3, a long gear 17d (see FIG. 1 for 17d), and the like. 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 17d of the zooming unit 17 is disposed in parallel to the optical axis O and is rotatably supported in a state where it is exposed to the inner peripheral portion of the fixed frame 2. The zoom motor 17a and the position sensor 17c are connected to an FPC 61a and an FPC 61b that are connected to a base circuit board (not shown) and branched from an FPC (flexible printed circuit board) 60 disposed on the outer peripheral surface of the fixed frame 2, respectively.

  The focusing unit 18 includes a focus motor 18a that is a focus drive source arranged in parallel to the optical axis O, a gear train (rotation transmission mechanism) 18b that transmits the drive force of the focus motor 18a, a feed screw 18c, a guide shaft 18d, , A position sensor 18e including a photo interrupter for detecting the origin position of the focusing optical system (fourth group lens 24) that contributes to the focusing operation in the photographing optical system of the lens barrel 1 is included (FIGS. 7 and 10). (See FIG. 11). Then, the focus motor 18a drives the fourth group lens 24 in a direction along the optical axis O. An FPC 61c and an FPC 61d branched from the FPC 60 are connected to the focus motor 18a and the position sensor 18e, respectively.

  The rotating frame 3 is formed in a cylindrical shape, and is fitted in the inner peripheral portion of the fixed frame 2 in a state where the rotating frame 3 can freely rotate and advance and retract. A cam follower 3 a that is slidably fitted in the cam groove 2 a of the fixed frame 2 and a gear portion 3 b that meshes with the long gear 17 d of the zooming unit 17 are formed at the outer peripheral rear portion of the rotating frame 3.

  Further, a cam frame rectilinear groove 3 c formed in a direction along the optical axis O is provided on the inner peripheral portion of the rotary frame 3. The cam frame rectilinear groove 3c is engaged with a tip of a cam follower 5a of the cam frame 5 described later, so that the cam frame 5 and the rotating frame 3 rotate together, and the cam frame 5 moves relative to the rotating frame 3. It is movable in the direction along the optical axis O.

  Further, a bayonet protrusion (not shown) is disposed on the inner peripheral rear end portion of the rotating frame 3 so as to sandwich the cam frame rectilinear groove 3c. The bayonet protrusion is provided for bayonet coupling of the rotating frame 3 and the moving frame 4 by being fitted into a circumferential groove 4e of the moving frame 4 as will be described later. Therefore, in a state in which the rotating frame 3 and the moving frame 4 are bayonet-coupled, the moving frame 4 is rotatable on the inner peripheral portion of the rotating frame 3 and the moving frame 4 is optical axis O with respect to the rotating frame 3. The forward / backward movement in the direction along the line is regulated.

  As described above, the cam follower 3a of the rotating frame 3 is slidably fitted into the cam groove 2a of the fixed frame 2, and the gear portion 3b is engaged with the long gear. Therefore, when the zoom motor 17a of the zooming unit 17 is driven and the long gear is rotationally driven, the driving force is transmitted to the rotary frame 3 via the gear portion 3b, and the rotary frame 3 is rotated. Yes. When the rotating frame 3 rotates in this manner, the cam follower 3a of the rotating frame 3 moves along the inclined cam groove portion of the inclined cam groove 2a of the fixed frame 2, so that the rotating frame 3 is in a retracted position while rotating. From the (rear moving end), it is advanced forward to the wide position (front moving end) which is the short focus position in the photographing enabled state. When the lens barrel 1 is in the photographing enabled state, the rotating frame 3 includes the cam follower 3a and the cam groove during a zooming operation from the wide position that is the short focus position to the tele position 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.

  The moving frame 4 is formed in a cylindrical shape, and is fitted in the inner peripheral portion of the rotating frame 3 so as to be relatively rotatable. A guide projection 4 a that fits into the rectilinear groove 2 b of the fixed frame 2 projects outward from the outer periphery of the rear end of the moving frame 4. As a result, the moving frame 4 is capable of moving back and forth in the direction along the optical axis O together with the rotating frame 3 while being restricted in rotation by the fixed frame 2.

  Further, the moving frame 4 is formed in a direction along the optical axis O, and a guide protrusion 6a of a straight guide frame 6 and a guide protrusion 7a of a guide frame 7 which will be described later are fitted into the guide frame 6 and the guide frame. 7, a rectilinear groove 4 b that restricts rotation, a cam frame cam groove 4 c formed in a direction inclined with respect to the optical axis O, and a bottomed circumferential groove 4 e formed at the outer peripheral rear portion. ing. The cam frame cam groove 4c is a groove portion through which the inner and outer circumferences penetrate.

  The moving frame 4 is disposed so as to be fitted into the inner peripheral portion of the rotating frame 3 in a state where the bayonet protrusion of the rotating frame 3 is fitted into the circumferential groove 4e. Thereby, the moving frame 4 is bayonet-coupled so that it can rotate relative to the rotating frame 3 and does not move forward and backward relative to the rotating frame 3 in the direction along the optical axis O. .

  The cam frame 5 is formed in a cylindrical shape and is disposed on the inner peripheral side of the moving frame 4. The cam frame 5 has a cam follower 5a projecting outward from the outer peripheral rear portion of the cam frame 5, and a coupling groove 5b into which the bayonet projection 7b of the guide frame 7 is fitted is formed in the projection formed with the cam follower 5a. Has been. 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. Further, a notched cam portion 5f for driving a barrier drive lever (not shown) is formed on the front end side of the cam frame 5.

  The cam follower 5a of the cam frame 5 is slidably engaged with the cam frame cam groove 4c of the moving frame 4, penetrates in the engaged state, and the tip of the cam follower 5a is the cam frame of the rotating frame 3. It is inserted and supported in the straight groove 3c. As a result, the cam frame 5 is supported so as to rotate integrally with the rotary frame 3 and to be movable back and forth in the direction along the optical axis O relative to the rotary frame 3.

  The rectilinear guide frame 6 is formed in a cylindrical shape, and has a guide projection 6 a that fits in the rectilinear groove 4 b of the moving frame 4 on the outer periphery of the rear end. The rectilinear guide frame 6 includes a second group rectilinear groove 6b and a third group rectilinear groove 6c formed so as to penetrate the inner and outer peripheries in the direction along the optical axis O.

  The rectilinear guide frame 6 is arranged in a bayonet connection with the cam frame 5 in a state of being fitted into the inner peripheral portion of the cam frame 5. At this time, the guide protrusion 6 a of the rectilinear guide frame 6 is fitted in the rectilinear groove 4 b of the moving frame 4. Thereby, the rectilinear guide frame 6 is supported by the moving frame 4 so as to be able to advance and retreat, and the rotation is restricted. Further, the guide projection 11a of the second group frame 11 is fitted into the second group straight movement groove 6b of the straight guide frame 6, and the guide projection 30a of the shutter / third group unit 8 is fitted into the third group straight movement groove 6c. . Thereby, the rectilinear guide frame 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 rotation.

  The rectilinear guide frame 6 is configured to move integrally with the cam frame 5 by the moving frame 4 in the direction along the optical axis O in a state in which the rotation is restricted with respect to the moving frame 4.

  The guide frame 7 is formed in a cylindrical shape, and has a bayonet protrusion 7 b that fits into the coupling groove 5 b of the cam frame 5 on the inner periphery of the rear end. Further, in the inner peripheral portion of the guide frame 7, a rectilinear groove 7 c is formed in the direction along the optical axis O to which the cam follower 12 a formed on the rear outer peripheral portion of the group frame 12 is fitted.

  The guide frame 7 is arranged in a bayonet connection with the cam frame 5 in a state where the guide frame 7 is fitted in the inner peripheral portion of the moving frame 4. At this time, the guide protrusion 7 a of the guide frame 7 is fitted in the rectilinear groove 4 b of the moving frame 4. Thus, the guide frame 7 is integrated with the cam frame 5 by the moving frame 4 in the direction along the optical axis O in a state where the rotation is restricted with respect to the moving frame 4 in the same manner as the straight guide frame 6. It is supposed to move.

  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 rectilinear guide frame 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 protrusion 11a is fitted into the second group straight advance groove 6b of the straight guide frame 6, and the cam follower 11b is inserted through the second group straight advance groove 6b and the second group cam of the cam frame 5 provided on the outer side thereof. The groove 5d is slidably fitted. Accordingly, the second group frame 11 is driven to advance and retract by the cam frame 5 in a state in which the rotation is restricted by the rectilinear guide frame 6.

  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 at a substantially central portion of the first group frame 12, and a lens barrier 27 is disposed inside the front surface so that the front surface of the first group lens 21 can be opened and closed. 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 12c (see FIGS. 4 and 6).

  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 in the rectilinear groove 7 c formed on the inner peripheral portion of the guide frame 7 and formed on the inner peripheral portion of the first group frame 12. The cam follower 12 c is fitted into a group cam groove 5 c formed on the outer peripheral portion of the cam frame 5. As a result, the first group frame 12 is driven forward and backward by the cam frame 5 in a state in which the rotation is restricted by the guide frame 7.

  The lens barrier 27 is rotatably supported at the front end portion of the first group frame 12 so as to be opened and closed by a barrier drive lever (not shown) that is rotatably supported in a spring-biased state. It has become. The barrier drive lever is configured to drive the lens barrier 27 in the closing direction in conjunction with being rotationally driven by the notched cam portion 5f of the cam frame 5 during the retracting operation of the lens barrel 1.

  As shown in detail in FIGS. 2 and 4 to 6, the shutter / third group unit 8 is fitted into the third group rectilinear frame 30 disposed on the rear side and the front side of the third group rectilinear frame 30. The shutter frame 31 that holds the shutter mechanism and the third group frame 10 that holds the third group lens 23 supported by the third group rectilinear frame 30 on the rear side of the shutter frame 31 are configured.

  The third group rectilinear frame 30 is formed in a substantially cylindrical shape, and an opening through which a photographing light beam passes is formed in a substantially central portion thereof. Further, the third group rectilinear frame 30 is provided with a plurality of (for example, three) guide projections 30a outwardly at equal intervals in the outer circumferential direction on the front outer circumference, and the guide projections 30a Are further provided with cam followers 30b projecting outward.

  The third group rectilinear frame 30 is arranged in a state of being fitted inside the rectilinear guide frame 6, and the guide protrusion 30a is fitted into the third group rectilinear groove 6c of the rectilinear guide frame 6, and the cam follower 30b penetrates through this. The cam frame 5 is inserted into the third group cam groove 5e. As a result, the third group rectilinear frame 30 is driven to move forward and backward by the cam frame 5 while being restricted in rotation by the rectilinear guide frame 6.

  The third group frame 10 has an aperture stop 10 a formed at the front end of a cylindrical holding portion that holds the third group lens 23. As clearly shown in FIG. 2, the third group frame 10 is provided with an arm portion 10 b, and a base end portion of the arm portion 10 b is in a direction along the optical axis O on the third group linearly moving frame 30. Is supported by a support shaft 10c that is implanted toward the front. As a result, the third group frame 10 is positioned by the support shaft 10c on the optical axis O shown by the solid line in FIG. 2 (the state shown in FIGS. 4 and 5) and the optical axis shown by the phantom line. It is pivotally supported so as to be rotatable (swingable) with respect to a position where the third lens group 23 is retracted from the optical axis to the outside of the optical axis (state shown in FIG. 6).

  Therefore, the rectilinear space for the third group 30 has a retreat space sufficient for the third group frame 10 to retreat out of the optical path of the photographing light beam when the third group frame 10 is rotated from the optical axis to the outside of the optical path. Is formed inside. The support shaft 10c is provided with a spring 10d that urges the third group frame 10 to be positioned on the optical axis O.

  The shutter frame 31 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.

  A conical 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 conical coil spring 35 is inserted so that the large diameter portion fits into the inner peripheral portion of the shutter frame 31 of the shutter / third group unit 8, and the small diameter portion fits into the outer peripheral portion of the lens holder portion of the second group frame 11. Has been inserted. Further, as clearly shown in FIG. 3, the large-diameter side tip portion 35a of the conical coil spring 35 is bent inward, and the small-diameter side tip portion 35b is bent outward.

  The fourth group frame 13 is a frame member that holds the fourth group lens 24. The fourth group lens 24 and the fourth group frame 13 have an arcuate cut portion 13 a having a shape corresponding to a part of the cylindrical shape of the third group frame 10 on the outer peripheral portion on the position side where the second group frame 11 is retracted. Yes. Further, on the rear side surface of the fourth group frame 13, stray light from the cut portion 13 a to the image sensor 110 provided in the sensor unit 100 is prevented and a rectangular shape matching the shape of the image sensor 110 is provided. A light shielding sheet 13b made of a black flexible member having an opening for forming a visual field is attached.

  Further, the fourth group frame 13 is provided with a long arm portion 13c and a short arm portion 13d that extend outward. Near the tip of the long arm portion 13c, there is a shaft hole 13e through which the guide shaft 18d of the focusing unit 18 is inserted, an engaging portion 13f that engages with the feed screw 18c, and a flag 13g that enters the position sensor 18e. Is formed. Further, a guide projection 13h that is slidably engaged with the rectilinear groove 2c of the fixed frame 2 is formed in the vicinity of the tip of the short arm 13d.

  The fourth group frame 13 is inserted and arranged behind the fixed frame 2, and is movable forward and backward in the direction along the optical axis O with respect to the fixed frame 2.

  That is, when the feed screw 18c is rotated via the gear train 18b by the driving force of the focus motor 18a of the focusing unit 18, the fourth group frame 13 is directed along the guide shaft 18d, that is, along the optical axis O. Drive forward and backward. As a result, it is positioned at an appropriate focusing position when it is in a photographing enabled state, and at a predetermined retracted position during a collapsing operation.

  Next, the lens configuration of the photographing optical system will be described.

  As described above, the electronic camera according to the present embodiment includes the first group lens 21, the second group lens 22, the third group lens 23, and the fourth group lens 24 in order from the object side as a photographing optical system. Here, the first group lens 21 has a positive refractive power, the second group lens 22 has a negative refractive power, and the third group lens 23 and the fourth group lens 24 each have a positive refractive power.

  As shown in detail in FIG. 5, for example, the lenses in each group are configured as follows. The first lens group 21 having a positive refractive power is constructed by joining, in order from the object side, a negative meniscus lens 21a having a convex surface facing the object side and a biconvex positive lens 21b. The second lens group 22 having negative refractive power includes, in order from the object side, a biconcave negative lens 22a, a positive meniscus lens 22b having a convex surface directed toward the image side, that is, the object side surface is concave and the image side surface is convex, A negative meniscus lens 22c facing the object-side concave surface, and the positive meniscus lens 22b and the negative meniscus lens 22c are joined together. The third lens unit 23 having positive refractive power includes, in order from the object side, a biconvex positive lens 23a, a biconvex positive lens 23b, and a biconcave negative lens 23c, and the biconvex positive lens 23b and biconcave negative lens. The lens 23c is cemented. The fourth group lens 24 having positive refractive power is composed of a single lens of a biconvex positive lens.

  Further, the image side surface of the biconvex positive lens 21b constituting the first group lens 21, the both surfaces of the biconcave negative lens 22a constituting the second group lens 22, the image side surface of the negative meniscus lens 22c, and the third group lens 23 are constituted. Both surfaces of the biconvex positive lens 23a and the both surfaces of the fourth group lens 24 are aspherical surfaces.

  When zooming from the wide position, which is the short focus position, to the tele position, which is the long focus position, the first lens group 21 moves to the object side, the second lens group 22 moves to the object side, and then moves to the image side. The third group lens 23 moves to the object side, and the fourth group lens 24 moves to the object side after moving to the image side, and then moves to the image side.

  These lens configurations are examples, and the first group lens 21 has a positive refractive power, the second group lens 22 has a negative refractive power, the third group lens 23 has a positive refractive power, and the fourth group lens 24 has a positive refractive power. Various lens configurations are possible. Therefore, for example, the second group lens 22 may be composed of two lenses, a second group object side lens and a second group image side lens.

  Here, since the third group lens 23 that can be retracted from the photographing optical path is held by the third group frame 10 on which the aperture stop 10a is formed, the aperture is smaller than that of the other lens groups. Therefore, the lens holding portion of the third group frame 10 is also small. As for the other lens groups, the diameter of the lens group located farther from the aperture stop 10a is larger. In the present embodiment, the biconcave negative lens 22a of the second group lens 22 constitutes a second group object side lens, and the cemented lens of the positive meniscus lens 22b and the negative meniscus lens 22c constitutes a second group image side lens. . The fourth group lens 24 has a smaller aperture than the second group object side lens of the second group lens 22.

  In the lens barrel 1 that holds the above-described photographing optical system, the fixed frame 2 is positioned and fixed to the base member 101 of the sensor unit 100 with screws. Thereby, an imaging unit in which the lens barrel 1 and the sensor unit 100 are combined is formed. For this reason, positioning pins (not shown) are implanted in two locations on the rear end surface of the fixed frame 2 so as to protrude rearward, and the positioning pins are engaged with the base member 101 of the sensor unit 100. Positioning holes 101a and 101b (see FIG. 10) are formed. One positioning hole 101a has an oval shape to absorb tolerance.

  Next, the configuration of the sensor unit 100 will be described.

  The sensor unit 100 is a unit having an image blur correction device, and includes a base member 101, Y guide shafts 109 and 111 supported by the base member 101 extending in the Y direction (first direction), and a Y feed screw. 112 and an X feed screw 113 extending and supported in the X direction (second direction), a slider 114 supported by the Y guide shaft 111 and the Y feed screw 112 so as to be movable in the Y direction, and a slider 114 X guide shafts 115 and 116 that are extended and supported in the X direction, a sensor holding frame 117 that is slidably supported in the X direction by the X feed screw 113 and the X guide shafts 115 and 116, and a sensor holding frame 117. An optical low-pass filter 118 and an image sensor 110 attached to the base member 101, a Y motor (first motor) 120 supported by the base member 101, and an X motor ( And a second motor) 130.

  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 rotates the Y feed screw 112 via the gear train 121 to drive the slider 114 in the Y direction. The X motor 130 rotates the X feed screw 113 through the gear train 131 to drive the sensor holding frame 117 in the X direction. FPCs 135a and 135b branched from the FPC 135 connected to the base circuit board are connected to and driven by the Y motor 120 and the X motor 130. Thereby, the sensor holding frame 117 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 115, respectively. Further, tension coil springs 123 and 133 are suspended between the base member 101, the slider 114, and the sensor holding frame 117, respectively. Thereby, the slider 114 and the sensor holding frame 117 are each urged | biased by the origin position.

  The image sensor 110 is connected to the FPC 141 and mounted on the sensor holding frame 117. A heat radiating plate 142 is attached to the sensor holding frame 117 so as to sandwich the FPC 141 on the back surface side of the image sensor 110.

  Here, the base member 101 of the sensor unit 100 has a rectangular shape having a first corner portion 151, a second corner portion 152, a third corner portion 153, and a fourth corner portion 154 as viewed from the lens barrel 1 side. I am doing. The first driving unit 161 including the Y motor 120 and the gear train 121 is mounted on the first corner 151, and the second driving unit 162 including the X motor 130 and the gear train 131 is mounted on the adjacent second corner 152. It is installed.

  A notch 155 is formed in a third corner 153 located on the opposite side of the first corner 151 and the optical axis O. The focusing unit 18 of the lens barrel 1 is provided on the fixed frame 2 so as to correspond to the notch 155, and the gear train 18b, the feed screw 18c, and the guide shaft 18d of the focusing unit 18 protruding from the fixed frame 2. A part of has entered the notch 155.

  The zooming unit 17 of the lens barrel 1 is provided on the fixed frame 2 so that the zoom motor 17a is positioned between the first drive unit 161 and the second drive unit 162. The gear train 17b of the zooming unit 17 is disposed on the object side of the first drive unit 161 so as to overlap the first drive unit 161 in the optical axis O direction.

  The second corner portion 152 of the base member 101 and the fourth corner portion 154 located on the opposite side through the optical axis O are notched so as to be chamfered, and an opening 156 is formed in the vicinity of the notch portion. In addition, a rising portion 157 having a flat portion toward the object side is formed on the outer edge portion of the opening 156.

  As clearly shown in FIG. 10, the FPC 141 to which the image sensor 110 is connected extends from the image sensor 110 in the direction of 45 degrees with respect to the Y direction and the X direction on the back surface side of the base member 101. ing. Then, at the fourth corner portion 154, it is branched into FPCs 141a and 141b and curvedly entered into the opening 156 in a U-shape, and further, on the flat surface of the outer wall of the rising portion 157 as shown in FIG. It is glued. Thereby, the image sensor 110 can be displaced with respect to the base member 101 together with the FPC 141.

  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.

  In the above configuration, the frame member of the lens barrel 1 and the base member 101 of the sensor unit 100 have a black exterior color, and the zoom motor 17a, the focus motor 18a, the Y motor 120, and the X motor 130 are The exterior color is different from black, for example, silver.

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

  First, when the lens barrel 1 is retracted from the retracted state and the rotating frame 3 is rotated clockwise, that is, in a photographing enabled state, that is, the rotating frame 3 is positioned at the front moving end and is in the short position. When it becomes, as shown in FIG. 4, each frame member moves in the direction along the optical axis O toward the front, and the lens barrel 1 is in an extended state as a whole. At the wide position, the second group frame 11 and the shutter / third group unit 8 are arranged at positions separated from each other.

  When the rotary frame 3 is further rotated clockwise from the wide position at the forward movement end, the first group lens 21 moves to the object side and the second group lens 22 moves to the object side along with the rotation. The third group lens 23 moves to the object side, the fourth group lens 24 moves to the image side, then moves to the object side, and then moves to the image side to perform a zooming operation. Then, at the tele position, which is the long focal position where the lens barrel 1 is extended to the maximum, the second group lens 22 and the third group lens 23 are in close proximity as shown in FIG.

  Further, when the rotating frame 3 is rotated counterclockwise from the state where the lens barrel 1 is in the wide position, each frame member moves rearward along the optical axis O as the rotating frame 3 rotates, The third group frame 10 moves from the position on the optical axis O to the outside of the optical axis and retracts from the optical path. As a result, the lens barrel 1 is in the retracted state as shown in FIG. In this retracted state, the third group frame 10 includes an image side end of a second group image side lens composed of a cemented lens of a biconcave negative lens 22b and a biconvex positive lens 22c constituting the second group lens 22, and a fourth group lens. It is retracted so as to be positioned at the arc-shaped cut portion 13a formed in the fourth group frame 13 between the 24 image side ends.

  As described above, according to the present embodiment, the first group frame 12, the second group frame 11, and the shutter / third group unit 8 of the lens barrel 1 are moved along the optical axis O by the rotation of one cam frame 5. Since the cam frame 5 is rotated, the axial dimension of the rotary frame 3 that is relatively advanced and retracted along the optical axis O can be reduced. Thereby, the axial dimension of the lens barrel 1 when retracted can be reduced, and the camera housing can be thinned when applied to an electronic camera. In addition, since the first group frame 12, the second group frame 11, and the shutter / third group unit 8 are advanced and retracted by one cam frame 5, the yield at the time of manufacturing the lens barrel 1 can be improved.

  Further, since the second group lens 22 and the third group lens 23 approach each other at the tele position, the entire length of the lens barrel 1 can be shortened, and the electronic camera can be made thinner. In addition, since the conical coil spring 35 is interposed between the second group frame 11 and the shutter / third group unit 8 so as to be urged away from each other, the second group lens 22 is moved to the object side in zooming operation. Even if the second lens group 22 has an inflection point that moves to the image side after moving to, the second group lens 22 can be smoothly advanced and retracted. Further, the conical coil spring 35 has a large-diameter tip 35a bent inward and a small-diameter tip 35b bent outward. It is possible to effectively prevent the occurrence of problems such as abnormal noise accompanying the winding reversal during the double operation.

  In the retracted state of the lens barrel 1, the third group frame 10 is retracted so as to be positioned at the arcuate cut portion 13 a formed in the fourth group frame 13. Therefore, the electronic camera can be expected to be smaller. In addition, since the light shielding sheet 13b is provided on the image side of the fourth group frame 13 so as to cover the arc-shaped cut portion 13a, it is possible to effectively prevent stray light from entering the image sensor 110 in a state where photographing is possible. can do.

  Further, since the focusing unit 18 is provided on the outer periphery of the fixed frame 2 to drive the focus of the fourth group frame 13, the outer diameter of the fixed frame 2 can be reduced, and accordingly, the fixed frame 2 is accommodated in the fixed frame 2. The outer diameter of other frame members can also be reduced.

  The sensor unit 100 also has a first drive unit 161 including a Y motor 120 that drives the image sensor 110 in the Y direction, mounted on the first corner 151, with the base member 101 having a substantially rectangular outer shape. A second drive unit 162 including an X motor 130 that drives 110 in the X direction is mounted on the second corner 152. A cutout portion 155 is formed in the third corner portion 153, and a gear train (rotation transmission mechanism) protruding from the fixed frame 2 of the focusing unit 18 provided in the lens barrel 1 in the cutout portion 155. ) 18b, the feed screw 18c, and a part of the guide shaft 18d are inserted to couple the lens barrel 1 to the base member 101. In the zooming unit 17 provided in the lens barrel 1, the zoom motor 17a is positioned between the first drive unit 161 and the second drive unit 162, and the gear train (rotation transmission mechanism) 17b is used for the first drive. The first drive unit 161 is disposed on the object side of the unit 161 in the optical axis O direction. Thereby, since the space surrounded by the cylindrical lens barrel 1 and the sensor unit 100 having the rectangular base member 101 can be used effectively, the lens barrel 1 and the sensor unit 100 are coupled. The projected area of the image pickup unit in the optical axis direction can be reduced, and the electronic camera can be miniaturized.

  The FPC 141 to which the image sensor 110 is connected extends from the direction of approximately 45 degrees with respect to the Y direction and the X direction to the fourth corner 154 and is taken out from the base substrate 101. Therefore, after extending the FPC 141 from the image sensor 110 in the X direction, the FPC 141 is bent in the Y direction and taken out through the fourth corner 154, or extended from the image sensor 110 in the Y direction, and then moved in the X direction. The length of the FPC 141 extending on the back surface of the base member 101 can be shortened as compared with the case where the base member 101 is bent and taken out through the fourth corner 154. Thereby, it is possible to prevent noise from being superimposed on the FPC 141.

  Moreover, the fourth corner 154 is notched so as to be chamfered, and an opening 156 is formed in the vicinity of the notch, and a flat portion is formed on the outer edge of the opening 156 toward the object side. Is formed. The FPC 141 to which the image sensor 110 is connected is branched into FPCs 141a and 141b at the fourth corner 154 and curvedly entered into the opening 156 in a U-shape. Glued. Accordingly, the image sensor 110 can be driven without being disturbed by the FPC 141 in the Y direction and the X direction, and the image shift can be corrected. Further, by chamfering the fourth corner portion 154, for example, a female screw portion for screwing a camera tripod can be disposed in the chamfered space, and the electronic camera can be further downsized.

  In the above embodiment, the exterior color of the lens barrel 1 and the base member 101 of the sensor unit 100 is black, and the zoom motor 17a, the focus motor 18a, the Y motor 120, and the X motor 130 are exterior colors different from black. Therefore, during the assembly operation of the imaging unit that couples the lens barrel 1 and the sensor unit 100, the zoom motor 17a is positioned between the Y motor 120 and the X motor 130, and the cutout portion of the third corner 153 is provided. It can be visually recognized that the focus motor 18a is positioned at 155. As a result, positioning pins (not shown) planted on the rear end surface of the fixed frame 2 can be easily engaged with the positioning holes 101a and 101b drilled in the base member 101. Efficiency can be improved.

  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 electronic camera, or applied to a camera using a silver salt film. You can also.

DESCRIPTION OF SYMBOLS 1 Lens barrel 2 Fixed frame 2a Cam groove 2b, 2c Straight advance groove 3 Rotating frame 4 Moving frame 5 Cam frame 6 Straight guide frame 7 Guide frame 8 Shutter / third group unit 10 Third group frame 10a Brightness stop 10b Arm part 10c Support Shaft 11 Second group frame 12 First group frame 13 Fourth group frame 13a Cut part 13b Light shielding sheet 13c Long arm part 13d Short arm part 13e Shaft hole 13f Engagement part 13h Guide projection part 17 Zooming unit 17a Zoom motor 17b Gear train (Rotation transmission mechanism) )
18 Focusing unit 18a Focus motor 18b Gear train (Rotation transmission mechanism)
18c feed screw 18d guide shaft 21 first group lens 22 second group lens 23 third group lens 24 fourth group lens 30 third group straight advance frame 31 shutter frame 35 conical coil spring 100 sensor unit 101 base member 110 image sensor 120 Y motor 130 X motor 141 FPC (Flexible printed circuit board)
151 1st corner 152 2nd corner 153 3rd corner 154 4th corner 155 Notch 156 Opening 157 Rising part 161 1st drive part 162 2nd drive part

Claims (6)

In a telescopic lens barrel,
A fixed frame,
Supported by the fixed frame, can move in the photographic optical axis direction while rotating between a forward moving end and a backward moving end respectively defined in the photographic optical axis direction, and is rotated at a fixed position at the forward moving end. Possible rotation frame,
A moving frame that moves in the photographing optical axis direction together with the rotating frame in a rotation-restricted state;
A cam frame that rotates with the rotating frame and moves in the direction of the photographic optical axis relative to the rotating frame;
A rectilinear guide frame that moves in the photographing optical axis direction together with the cam frame in a rotation restricted state;
A guide frame that moves in the photographing optical axis direction together with the cam frame in a rotation restricted state;
A group frame holding a group lens having a positive refractive power that moves in the direction of the photographing optical axis by rotation of the cam frame in a rotation restricted state;
A second group frame holding a second group lens having a negative refractive power that moves in the direction of the photographing optical axis by rotation of the cam frame in a rotation restricted state;
A third group frame that holds a third group lens having positive refractive power that moves in the photographing optical axis direction by rotation of the cam frame in a rotation restricted state, and a shutter / third group unit that supports the shutter;
A four-group frame holding a four-group lens having positive refractive power supported so as to be movable in the photographing optical axis direction on the fixed frame, and
The rotating frame is disposed on the inner peripheral side of the fixed frame,
The moving frame is rotationally restricted by the fixed frame and arranged on the inner peripheral side of the rotating frame,
The guide frame is rotationally restricted by the moving frame and arranged on the inner peripheral side of the moving frame,
The group frame is restricted by the guide frame and is arranged on the inner peripheral side of the guide frame,
The cam frame is disposed on the inner peripheral side of the group frame,
The rectilinear guide frame is disposed on the inner peripheral side of the cam frame by being restricted in rotation by the moving frame,
The second group frame and the shutter / third group unit are disposed on the inner peripheral side of the rectilinear guide frame by being restricted in rotation by the rectilinear guide frame,
By positioning the rotating frame between the rear moving end and the front moving end, positioning between the retracted state and the shootable state is performed, and in the shootable state, from the object side of the photographic optical axis. In order on the image side, the first group lens, the second group lens, the third group lens, and the fourth group lens are positioned, and a zooming action is performed by a fixed position rotation of the rotary frame at the front moving end ,
When zooming from the wide position, which is the short focus position, to the tele position, which is the long focus position, the first group lens moves to the object side, the second group lens moves to the object side, and then moves to the image side. A lens barrel characterized in that the group lens moves to the object side, the fourth group lens moves to the object side after moving to the image side, and then moves to the image side . The second group lens has at least two lenses of a second group object side lens and a second group image side lens having a smaller outer shape than the second group object side lens ,
The fourth group lens is made outline smaller lens than the second group object side lens,
The third group frame further holds an aperture stop. In the photographing enabled state, the brightness stop and the third group lens are positioned on the photographing optical axis, and in the retracted state, the brightness stop and the three group lens are positioned. When the group lens is viewed from the direction orthogonal to the photographing optical axis, the shutter / third group unit is swung so as to be retracted between the image side end of the second group image side lens and the image side end of the fourth group lens. Configured to be movable,
The lens barrel according to claim 1 . A conical coil spring disposed between the second group frame and the shutter / third group unit and biasing the second group frame and the shutter / third group unit in a direction away from each other;
The large-diameter end of the conical coil spring is bent inward, and the small-diameter end is bent outward.
The lens barrel according to claim 1 or 2 , wherein The fourth group lens and the fourth group frame have a shape having a cut portion corresponding to a part of the outer shape of the third group frame on the outer periphery,
The third group frame is configured to be retracted to the cut portion in the retracted state.
The lens barrel according to any one of claims 1 to 3 , wherein the lens barrel is provided. A focus motor is provided on the outer periphery of the fixed frame,
The fourth group frame is provided with a short arm portion and a long arm portion protruding in a direction orthogonal to the photographing optical axis,
The tip of the short arm is engaged with a rectilinear groove formed on the inner peripheral surface of the fixed frame so as to extend in parallel with the photographing optical axis,
The distal end portion of the long arm portion is provided to extend in parallel to the imaging optical axis on the fixed frame, and is engaged with a rotation shaft coupled to the focus motor via a rotation transmission mechanism,
The fourth group frame is configured to move in the photographing optical axis direction by rotating the rotation shaft via the rotation transmission mechanism by the focus motor.
The lens barrel according to any one of claims 1 to 4 , wherein: The lens barrel according to any one of claims 1 to 5 ,
Arranged on the image side of the lens barrel and generates image data by receiving an optical image formed through the first group lens, the second group lens, the third group lens, and the fourth group lens in the photographing enabled state. An image sensor;
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;
An electronic camera comprising:

Images