JP2010066375A - Deflection correcting device, lens barrel, and imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deflection correction device capable of suppressing generation of a flare or a ghost. <P>SOLUTION: This deflection correction device is equipped with the first pole 96L and the second pole 96S fixed to a reference frame 58, and having each shape extending to a direction orthogonal to an optical axis AZ; the first engaging part 57L formed on a movable frame 57, engaged with the first pole 96L, for regulating movement in the optical axis direction of the movable frame 57 to the reference frame 58; the second engaging part 57S formed on the movable frame 57, engaged with the second pole 96S, for regulating movement in the optical axis direction of the movable frame 57 to the reference frame 58; the first shielding part 57L arranged on the subject side of the first pole 96L, for covering the first pole from the subject side; and the second shielding part 57S arranged on the subject side of the second pole 96S, for covering the second pole 96S from the subject side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a shake correction apparatus capable of correcting blurring of an optical image of a subject, a lens barrel using the same, and an imaging apparatus.

  In recent years, a digital camera is equipped with a shake correction function for preventing blurring of an image caused by camera shake. For example, in an interchangeable lens type digital camera, there is a so-called lens shift type shake correction device that performs shake correction by moving a part of the interchangeable lens in a plane perpendicular to the optical axis.

Patent Document 1 discloses a shake correction apparatus. In this shake correction device, a pole is fixed to a reference frame, and an engaging portion provided on the movable frame is engaged with the pole, thereby restricting movement of the movable frame in the optical axis direction.
JP 2007-156351 A

  In the shake correction apparatus described in Patent Document 1, the pole is exposed when viewed from the subject side. Further, the pole often has a glossy surface in order to reduce sliding friction. Therefore, there is a problem that flare and ghost are generated by reflection of light at the pole.

  An object of the present invention is to provide a shake correction device that suppresses the occurrence of flare and ghost.

The above object can be realized by the following shake correction apparatus. The shake correction device
A reference frame,
A movable frame that supports the shake correction lens group and is movable with respect to the reference frame in a plane orthogonal to the optical axis of the shake correction lens group;
A first driving unit that applies a driving force in a first direction perpendicular to the optical axis to the movable frame;
A second driving unit that applies a driving force in a second direction perpendicular to the optical axis to the movable frame;
A first pole fixed to the reference frame and having a shape extending in a direction perpendicular to the optical axis;
A second pole fixed to the reference frame and having a shape extending in a direction perpendicular to the optical axis;
A first engaging portion that is formed on the movable frame, engages with the first pole, and restricts movement of the movable frame relative to the reference frame in the optical axis direction;
A second engaging portion that is formed on the movable frame, engages with the second pole, and restricts movement of the movable frame relative to the reference frame in the optical axis direction;
A first light-shielding portion disposed on the subject side of the first pole and covering the first pole from the subject side;
A second light-shielding portion disposed on the subject side of the second pole and covering the second pole from the subject side.

  According to the present invention, it is possible to provide a shake correction apparatus that suppresses the occurrence of flare and ghost.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
<Overview of digital camera>
The digital camera 1 will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram of a digital camera 1. As shown in FIG. 1, a digital camera 1 (an example of an imaging device) is an interchangeable lens type digital camera, and mainly includes a camera body 3 and an interchangeable lens unit 2 (removably attached to the camera body 3) ( An example of a lens barrel). The interchangeable lens unit 2 is attached to a body mount 4 provided on the front surface of the camera body 3 via a lens mount 95.

  FIG. 2 is a block diagram showing the configuration of the camera body 3. FIG. 3 is a schematic perspective view of the digital camera 1. 4A is a top view of the camera body 3, and FIG. 4B is a rear view of the camera body 3. FIG. 5 to 8 are schematic cross-sectional views of the interchangeable lens unit 2. 5 and 6 show the wide-angle end state, and FIGS. 7 and 8 show the telephoto end state. FIG. 6 is a cross-sectional view in a different plane from FIG. 8 is a cross-sectional view in a different plane from FIG. 9 and 10 are exploded perspective views of the second lens group unit 77 and the focus lens unit 75. FIG. 12A and 12B are configuration diagrams of the optical system L. FIG. FIG. 12A shows the state at the wide-angle end, and FIG. 12B shows the state at the telephoto end. FIG. 13 shows the relationship between the rotation position of the zoom ring 84 and the distance from the image sensor 11 of each member.

  In the present embodiment, a three-dimensional orthogonal coordinate system is set for the digital camera 1. The optical axis AZ of the optical system L (described later) coincides with the Z-axis direction (an example of the optical axis direction). The X axis direction coincides with the horizontal direction in the vertical shooting posture of the digital camera 1. The Y-axis direction coincides with the vertical direction in the horizontal shooting posture of the digital camera 1. In the following description, “front” refers to the subject side (Z axis direction positive side) of the digital camera 1, and “rear” refers to the opposite side of the subject side of the digital camera 1 (user side, Z axis direction). Means negative side).

<Interchangeable lens unit>
A schematic configuration of the interchangeable lens unit 2 will be described with reference to FIGS. As shown in FIG. 1, the interchangeable lens unit 2 includes an optical system L, a lens support mechanism 71 that supports the optical system L, a focus adjustment unit 72, a diaphragm adjustment unit 73, a shake correction unit 74, and a lens microcomputer. 40.

(1) Optical System The optical system L is a zoom lens system for forming an optical image of a subject, and is mainly composed of four lens groups. Specifically, as shown in FIGS. 12A and 12B, the optical system L includes a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power. And a third lens group G3 having a negative refractive power and a fourth lens group G4 having a positive refractive power.

  The first lens group G1 includes a first lens L1 and a second lens L2 disposed on the imaging sensor 11 side of the first lens L1. The first lens L1 is a negative meniscus lens having a convex surface facing the subject. The second lens L2 is a positive meniscus lens having a convex surface facing the subject side, and is joined to the first lens L1 via an adhesive layer.

  The second lens group G2 includes a third lens L3, a fourth lens L4 arranged on the imaging sensor 11 side of the third lens L3, and a fifth lens L5 (on the imaging sensor 11 side of the fourth lens L4). An example of a first lens element). The third lens L3 is a negative meniscus lens having a convex surface facing the subject side. The fourth lens L4 is a biconcave lens. The fifth lens L5 is a biconvex lens.

  The third lens group G3 includes a sixth lens L6 (an example of a focus lens). The sixth lens L6 is a negative meniscus lens having a convex surface facing the image sensor 11, and is located between the fifth lens L5 and the seventh lens L7 in the Z-axis direction (between the second lens group G2 and the fourth lens group G4). (Between the Z-axis directions).

  The fourth lens group G4 includes a seventh lens L7 (an example of a second lens element), an eighth lens L8, a ninth lens L9, a tenth lens L10, an eleventh lens L11, and a twelfth lens L12. ,have. The seventh lens L7 is a positive meniscus lens for shake correction, and has a convex surface facing the image sensor 11 side. The eighth lens L8 is a biconvex lens. The ninth lens L9 is a biconcave lens and is bonded to the eighth lens L8 via an adhesive layer. The tenth lens L10 is a biconvex lens. The subject side surface of the tenth lens L10 is aspheric. The eleventh lens L11 is a negative meniscus lens having a convex surface facing the subject, and is joined to the tenth lens L10 via an adhesive layer. The twelfth lens L12 is a biconvex lens.

  As shown in FIGS. 12A, 12B, and 13, during zooming from the wide-angle end to the telephoto end, the first lens group G1 to the fourth lens group G4 each have an optical axis AZ toward the subject side. Along the Z axis. More specifically, during zooming from the wide-angle end to the telephoto end, the distance between the first lens group G1 and the second lens group G2 increases, and the distance between the second lens group G2 and the third lens group G3 increases. The distance between the third lens group G3 and the fourth lens group G4 decreases. The aperture unit 62 (described later) moves to the subject side together with the fourth lens group G4.

  Further, at the time of focusing from the infinitely focused state to the close junction focused state, the third lens group G3 moves toward the subject side along the optical axis AZ.

  Furthermore, in order to suppress the shake of the optical image due to the movement of the digital camera 1, the seventh lens L7 moves in two directions orthogonal to the optical axis AZ.

(2) Lens Support Mechanism The lens support mechanism 71 is a mechanism for movably supporting the optical system L, and includes a lens mount 95, a fixed frame 50, a cam barrel 51, a first holder 52, and a first holder 52. A lens group support frame 53, a second lens group support frame 54 (an example of a first lens support frame), a second holder 55 (an example of a first lens support frame), and a third lens group support frame 56 (a focus lens) An example of a support frame), a fourth lens group support frame 61, a zoom ring unit 83 (an example of a zoom mechanism), and a focus ring unit 88.

  The lens mount 95 is a portion to be attached to the body mount 4 of the camera body 3 and has a lens side contact 91. The fixed frame 50 is a member that rotatably supports the cam cylinder 51 and is fixed to the lens mount 95. The fixed frame 50 includes a protrusion 50a at the end on the positive side in the Z-axis direction, three recesses 50b provided on the outer periphery, and three through-straight grooves 50c arranged at an equal pitch around the optical axis AZ. Have. The cam cylinder 51 has three convex portions 51a provided on the inner periphery, three first cam grooves 51d, three second cam grooves 51b, and three third cam grooves 51c. is doing. Since the convex part 51a of the cam cylinder 51 is inserted into the concave part 50b of the fixed frame 50, the cam cylinder 51 is fixed so as to be rotatable with respect to the fixed frame 50 in a state where relative movement in the Z-axis direction is restricted. It is supported by the frame 50.

  The first lens group support frame 53 is fixed to the first holder 52 and supports the first lens group G1. The first holder 52 has a longitudinal groove 52a formed on the inner peripheral side and extending in the Z-axis direction, and three cam pins 81 arranged at an equal pitch around the optical axis AZ. The protrusion 50a of the fixed frame 50 is inserted into the vertical groove 52a. The cam pin 81 is inserted into the first cam groove 51 d of the cam cylinder 51. With these configurations, the first holder 52 can move in the Z-axis direction without rotating with respect to the fixed frame 50. The amount of movement of the first holder 52 relative to the fixed frame 50 is determined by the shape of the first cam groove 51d. At the tip of the first holder 52, an internal thread portion 52c for attaching an optical filter such as a polarizing filter or a protective filter and a conversion lens is formed.

  The second lens group support frame 54 is fixed to the second holder 55 and supports the second lens group G2. The second lens group support frame 54 and the second holder 55 constitute a second lens group unit 77 (an example of a first lens unit). The second holder 55 has three convex portions 55b arranged at an equal pitch around the optical axis AZ, and three cam pins 82 fixed to the convex portions 55b. The cam pin 82 is inserted into the second cam groove 51 b of the cam cylinder 51. The convex portion 55 b is inserted into the through-going straight groove 50 c of the fixed frame 50. With these configurations, the second lens group support frame 54 and the second holder 55 can move in the Z-axis direction without rotating with respect to the fixed frame 50. The amount of movement of the second lens group support frame 54 and the second holder 55 relative to the fixed frame 50 is determined by the shape of the second cam groove 51b.

  The third lens group support frame 56 is a member that supports the third lens group G3 (more specifically, the sixth lens L6 that functions as a focus lens), and includes a bearing portion 56a, a detent portion 56b, and a rack support portion. 56c and a protrusion 56d. The sixth lens L6 and the third lens group support frame 56 constitute a focus lens unit 75. The second holder 55 supports the front end portions of the two guide poles 63a and 63b extending in the Z-axis direction. The guide pole support plate 65 is a member for supporting the rear end portion of the guide pole 63a, and is fixed to the image sensor 11 side of the second holder 55. A guide pole 63a is inserted into the bearing portion 56a, and a guide pole 63b is inserted into the anti-rotation portion 56b. The third lens group support frame 56 is supported by the guide poles 63a and 63b so as to be movable in the Z-axis direction in a state where the rotation around the optical axis AZ is restricted.

  The rack support portion 56c is a portion extending from the bearing portion 56a to the negative side in the Z-axis direction, and supports the rack 66 so as to be integrally movable and rotatable in the axial direction. The rack 66 has a rack body 66a having a plurality of teeth 66c and a shaft portion 66b extending in the Z-axis direction. The plurality of teeth 66c mesh with the lead screw 64a of the focus motor 64. Since the shaft portion 66b is supported by the rack support portion 56c, the rack 66 can rotate around the central axis R with respect to the rack support portion 56c.

  Furthermore, as shown in FIGS. 9 and 11, a torsion coil spring 68 is attached to the rack support portion 56c. The torsion coil spring 68 has a winding portion 68a that generates an elastic force, a first end portion 68b, and a second end portion 68c. The winding portion 68 a is inserted into the shaft portion 66 b of the rack 66. The first end 68 b is hooked on the rack support 56 c and the second end 68 c is hooked on the rack 66 while the winding portion 68 a is twisted. That is, the torsion coil spring 68 applies a rotational force in the A direction to the rack 66, and always presses the rack 66 against the lead screw 64a. Thereby, the backlash between the rack 66 and the lead screw 64a can be reduced, and the position accuracy of the focus lens unit 75 can be increased. Further, since the rack 66 is always pressed against the lead screw 64a, the driving force can be efficiently transmitted from the lead screw 64a to the rack 66.

  Further, the winding portion 68 a of the torsion coil spring 68 is compressed in the Z-axis direction (direction parallel to the central axis R) between the rack support portion 56 c and the rack 66. The torsion coil spring 68 applies a pressing force F to the rack 66, and the rack 66 is pressed against the rack support portion 56c by the torsion coil spring 68. Thereby, it is possible to suppress the rack 66 from moving in the Z-axis direction with respect to the rack support portion 56c, and the position accuracy of the focus lens unit 75 can be further increased.

  A focus motor 64 (an example of a focus actuator) is fixed to the second holder 55. The focus motor 64 is, for example, a stepping motor. The focus motor 64 has a lead screw 64a as a rotation shaft extending in the Z-axis direction. A rack 66 is engaged with the lead screw 64a.

  The protrusion 56d is a part for detecting the origin of the focus lens unit 75, and is provided at a position where it can pass through a detection region of a photosensor 67 (described later). In the present embodiment, since the third lens group G3, which is the focus lens group, is formed by one sixth lens L6, the weight of the third lens group G3 can be, for example, 1 g or less, and the focus motor 64 The driving speed can be increased.

  The fourth lens group support frame 61 (an example of a second lens support frame) includes a first support frame 57 (an example of a movable frame), a second support frame 58 (an example of a reference frame), and a third support frame 59. And a fourth support frame 60. The fourth lens group G4 and the fourth lens group support frame 61 constitute a fourth lens group unit 78 (an example of a second lens unit).

  The first support frame 57 supports a seventh lens L7 (an example of a shake correction lens group). The second support frame 58 supports the eighth lens L8 and the ninth lens L9, and further supports the first support frame 57 so as to be movable in two directions orthogonal to the optical axis AZ. The second support frame 58 has three cam pins 80 arranged at an equal pitch around the optical axis AZ.

  The third support frame 59 supports the tenth lens L10 and the eleventh lens L11, and is fixed to the second support frame 58 by screws, for example. The fourth support frame 60 supports the twelfth lens L12 and is fixed to the third support frame 59 by screws, for example. With these configurations, the first support frame 57, the second support frame 58, the third support frame 59, and the fourth support frame 60 move together along the optical axis AZ.

  Further, the first support frame 57 is supported by the second support frame 58 so as to be movable in two directions orthogonal to the optical axis AZ, for example. With this configuration, the first support frame 57 moves in a direction perpendicular to the optical axis AZ while moving integrally in the Z-axis direction with respect to the second support frame 58, the third support frame 59, and the fourth support frame 60. Is possible.

  The zoom ring unit 83 includes a ring base 86, a zoom ring 84 (an example of a zoom operation unit), and a linear position sensor 87 that detects the rotational position of the zoom ring 84. The rotation position of the zoom ring 84 means a position in the rotation direction of the zoom ring 84 and can also be referred to as a rotation angle of the zoom ring 84 from a certain reference position.

  The zoom ring 84 has a cylindrical shape, and is supported by a ring base 86 fixed to the fixed frame 50 so as to be rotatable around the optical axis AZ in a state where movement in the Z-axis direction is restricted. The zoom ring 84 has a through hole 84a at the end on the negative side in the Z-axis direction. A zoom drive pin 85 fixed to the cam cylinder 51 is inserted into the through hole 84a. As a result, the cam cylinder 51 rotates integrally with the zoom ring 84 and the optical axis AZ.

  The linear position sensor 87 detects the rotation position and rotation direction of the zoom ring 84 by the user, and transmits the detection result to the lens microcomputer 40. Specifically, the linear position sensor 87 is fixed to the ring base 86 and has a slider 87a protruding outward in the radial direction. The slider 87 a is inserted into a cam groove 84 b formed in the zoom ring 84. When the zoom ring 84 rotates with respect to the fixed frame 50, the slider 87a moves in the Z-axis direction along the cam groove 84b. The linear position sensor 87 has a variable resistor. When the slider 87a slides on the magnetic resistor in the variable resistor, the linear position sensor 87 slides between terminals to which a predetermined voltage is applied to both ends. An output (output voltage) proportional to the position of the moving element 87a in the Z-axis direction can be obtained linearly. By converting the output of the linear position sensor 87 into rotational position information, the rotational position of the zoom ring 84 can be detected. On the outer peripheral surface of the zoom ring 84, the focal length of the optical system L is displayed.

  Since the first lens group G1 to the fourth lens group G4 are mechanically coupled via the lens support mechanism 71, the absolute positions of the first lens group G1 to the fourth lens group G4 (for example, the imaging sensor 11). The position with respect to the light receiving surface 11a as a reference) has a certain relationship with the rotational position of the zoom ring 84. Therefore, by detecting the rotational position of the zoom ring 84, for example, the absolute positions of the first lens group G1 to the fourth lens group G4 with respect to the lens mount 95 can be grasped. The zoom ring 84 may have another structure such as a movable lever.

  The focus ring unit 88 includes a focus ring 89 and a focus ring angle detection unit 90 that detects the rotation angle of the focus ring 89. The focus ring 89 has a cylindrical shape, and is supported by the ring base 86 so as to be rotatable around the optical axis AZ in a state where movement in the Z-axis direction is restricted. The focus ring angle detection unit 90 can detect the rotation angle and the rotation direction of the focus ring 89. For example, the focus ring angle detection unit 90 includes two photo sensors (not shown). The focus ring 89 has a plurality of protrusions 89a that are arranged at equal intervals in the rotation direction and protrude inward in the radial direction. Each photosensor has a light emitting part (not shown) and a light receiving part (not shown), and a plurality of protrusions 89a pass between the light emitting part and the light receiving part, whereby the rotation angle of the focus ring 89 And the direction of rotation can be detected. The focus ring 89 may have another structure such as a movable lever.

(3) Focus Adjustment Unit The focus adjustment unit 72 includes a focus motor 64, a focus drive control unit 41, and a photo sensor 67 (an example of a position sensor). The focus motor 64 is fixed to the second holder 55 and drives the focus lens unit 75 in the Z-axis direction with respect to the second lens group unit 77. The focus lens unit 75 is driven by the second lens group unit 77 only by the focus motor 64. In other words, when the focus motor 64 is not driving the focus lens unit 75 (for example, when power is not supplied to the focus motor 64), the focus lens unit 75 is moved with respect to the second lens group unit 77. It is not possible. In this case, the focus lens unit 75 moves integrally with the second holder 55 in the Z-axis direction.

  The lead screw 64 a of the focus motor 64 rotates based on the drive signal input from the focus drive control unit 41. The rotational motion generated by the focus motor 64 is converted into a linear motion in the Z-axis direction of the focus lens unit 75 by the lead screw 64a and the rack 66. As a result, the focus lens unit 75 can move in the Z-axis direction with respect to the second lens group unit 77.

  In this digital camera 1, in order to realize a zoom lens system that can change the focal length while keeping the subject distance substantially constant, the focus adjustment unit 72 performs focusing based on a tracking table stored in advance in the lens microcomputer 40. The lens unit 75 is driven. Here, such a tracking method is called electronic tracking.

  The tracking table refers to the position of the focus lens unit 75 where the subject distance in focus is maintained substantially constant even if the focal length changes (more specifically, the focus lens unit 75 relative to the second lens group unit 77). Information). That the subject distance is substantially constant means that the amount of change in the subject distance falls within a predetermined depth of field. The electronic tracking will be described later.

  The second holder 55 is mounted with a photo sensor 67 that detects the origin position of the focus lens unit 75. The photo sensor 67 has a light emitting part (not shown) and a light receiving part (not shown). When the projection 56d of the third lens group support frame 56 passes between the light emitting unit and the light receiving unit, the photosensor 67 can detect the presence or absence of the projection 56d. That is, the origin position of the focus lens unit 75 with respect to the second lens group unit 77 can be detected by the photo sensor 67. In other words, the photosensor 67 is an origin detector that detects the origin position of the third lens group G3 with respect to the second lens group G2. The lens microcomputer 40 drives the third lens group G3 to the origin position, and recognizes that the focus lens unit 75 (third lens group G3) is at the origin position based on a signal from the photosensor 67.

  The origin position that can be detected by the photosensor 67 is an absolute position that does not move relative to the second lens group unit 77. Therefore, when the position of the focus lens unit 75 is reset to the origin position with respect to the second lens group unit 77, the focus lens unit 75 is driven to a position where the photosensor 67 detects the origin detection protrusion 56d. To do. For example, when the power switch 25 of the digital camera 1 is turned off, the focus lens unit 75 is moved to a position where the photosensor 67 detects the protrusion 56d of the third lens group support frame 56 regardless of the current position of the focus lens unit 75. It is driven by the focus motor 64. After the driving of the focus lens unit 75 is completed, the digital camera 1 is turned off. Conversely, when the power switch 25 of the digital camera 1 is turned on, the focus lens unit 75 is driven by the focus motor 64 to a predetermined position determined based on the tracking table. The origin detector is not limited to a photo sensor, and may be realized by combining a magnet and a magnetic sensor, for example.

(4) Aperture Adjustment Unit The aperture adjustment unit 73 includes an aperture unit 62 (an example of an aperture device), an aperture drive motor that drives the aperture unit 62, and an aperture drive control unit 42 that controls the aperture drive motor 62M. is doing. The aperture drive motor 62M is, for example, a stepping motor. The aperture drive motor is driven based on a drive signal input from the aperture drive control unit 42. The aperture blade 62a is driven in the opening direction and the closing direction by the driving force generated by the aperture driving motor, and the aperture shape changes. The aperture value of the optical system L can be changed by driving the aperture blade 62a.

  FIG. 15 is an exploded perspective view of the second support frame 58, the aperture unit 62, and the third support frame 59. FIG. 16 is an exploded perspective view of the second support frame 58, the aperture unit 62, and the third support frame 59 as seen from different angles. FIG. 17 is a diagram of the second support frame 58 and the aperture unit 62 as viewed from the image sensor side. The aperture unit 62 is sandwiched between the second support frame 58 (an example of a first aperture support frame) and a third support frame 59 (an example of a second aperture support frame) from the optical axis AZ direction.

  A positioning boss 58A (an example of a positioning part) and a rotation stop boss 58B (an example of a positioning part) are formed on the aperture unit 62 side of the second support frame 58 so as to protrude toward the aperture unit 62 in the optical axis AZ direction. ing. Here, the positioning boss 58A and the rotation stopping boss 58B are arranged so that the center axis of the positioning boss 58A, the center axis of the rotation stopping boss 58B, and the optical axis AZ are positioned on a straight line in a plane orthogonal to the optical axis AZ. It is desirable that Furthermore, it is preferable that the distance between the positioning boss 58A and the rotation stop boss 58B in a plane perpendicular to the optical axis is wide. This is because the positioning accuracy of the aperture unit 62 is improved.

  The aperture unit 62 is formed with a positioning hole 62A that engages with a positioning boss 58A (an example of a positioning engagement portion) and a rotation stop hole 62B that engages with a rotation stop boss 58B (an example of a positioning engagement portion). Yes. The positioning boss 58A and the rotation stop boss 58B are in contact with the aperture unit 62 from the direction orthogonal to the optical axis AZ. As a result, the position of the aperture unit 62 in the direction orthogonal to the optical axis AZ is determined.

  Specifically, the engagement between the positioning boss 58A and the positioning hole 62A restricts parallel movement in a plane orthogonal to the optical axis of the aperture unit 62. The shape of the positioning hole 62A is substantially the same as the shape of the positioning boss 58A in the same plane. Furthermore, the rotation of the stop unit 62 in a plane orthogonal to the optical axis AZ is restricted by the engagement of the rotation stop boss 58B and the rotation stop hole 62B. The shape of the rotation stop hole 62B is, for example, a long hole or a U-shape.

  The third support frame 59 is formed with three leaf springs 59C (an example of an urging portion). Three leaf spring contact portions 62 </ b> C are formed on the diaphragm unit 62 on the side facing the third support frame 59. When the third support frame 59 is fixed to the second support frame 58 with screws or the like, the leaf spring 59C comes into contact with the leaf spring contact portion 62C, and the leaf spring 59C gives a pressing force to the leaf spring contact portion 62C. The diaphragm unit 62 is pressed against the second support frame 58. The aperture unit 62 abuts on the second support frame 58. Thereby, the position of the aperture unit 62 in the optical axis AZ direction is determined.

  The three leaf springs 59C are arranged at approximately 120 ° intervals around the optical axis in a plane orthogonal to the optical axis. This is because the diaphragm unit 62 to be in contact with is parallel to a plane perpendicular to the optical axis. Further, it is preferable that the leaf springs 59C are arranged with a large space between each other. This is because the accuracy of positioning of the aperture unit 62 in the optical axis direction is improved.

  In addition, diaphragm blades exist inside the diaphragm unit 62. The distance between the optical axis AZ and the leaf spring 59C is larger than the maximum distance between the optical axis AZ and the aperture blade in a plane orthogonal to the optical axis AZ. That is, in the plane orthogonal to the optical axis AZ, the leaf spring 59C and the leaf spring contact portion 62C are disposed outside the diaphragm blades. This is to prevent the drive performance of the diaphragm blades from being deteriorated by the pressing force received from the leaf spring 59C.

  In addition, as shown in FIG. 17, in polar coordinates centered on the optical axis AZ in a plane orthogonal to the optical axis AZ, the deviation angle θ where the leaf spring contact portion 62C is disposed and the cam pin 80 are disposed. It is desirable that the declination of the locations is substantially equal. In other words, in polar coordinates centered on the optical axis AZ in a plane orthogonal to the optical axis AZ, the deflection angle θ where the leaf spring 59C is disposed and the deflection angle where the cam pin 80 is disposed are substantially equal. Is preferably equal to Since the position of the second support frame 58 in the interchangeable lens unit 2 is determined by the engagement of the cam pin 80 and the cam groove 51c for the fourth group lens support frame unit, the cam pin 80, the leaf spring contact portion 62C, and the leaf spring 59C This is because the position of the diaphragm unit 62 in the interchangeable lens unit 2 becomes highly accurate because the phases (deflection angles) are substantially equal.

  As described above, the aperture unit 62 is fixed to the second support frame 58, but no screw is used as a fixing means. Therefore, the second support frame 58 is not distorted by the screw tightening stress, and the eighth lens L8 and the like are not displaced.

(5) Shake Correction Unit The shake correction unit 74 is a unit for suppressing the shake of the optical image due to the movement of the interchangeable lens unit 2 and the camera body 3, and includes the electromagnetic actuator 46, the position detection sensor 47, the shake. And a correction microcomputer 48.

  The electromagnetic actuator 46 drives the first support frame 57 in a direction orthogonal to the optical axis AZ. The position detection sensor 47 is a sensor for detecting the position of the first support frame 57 with respect to the second support frame 58. The interchangeable lens unit 2 is equipped with a motion detection sensor (not shown) such as a gyro sensor. The shake correction microcomputer 48 controls the electromagnetic actuator 46 based on the detection result of the position detection sensor 47 and the detection result of the motion detection sensor. Thereby, the shake of the subject image due to the movement of the digital camera 1 can be suppressed.

  Note that electronic shake correction that corrects shake appearing in an image based on image data output from the image sensor 11 may be applied as a method for suppressing shake of the subject image. Further, as a method for suppressing the shake of the optical image, a sensor shift method in which the imaging sensor 11 is driven in two directions orthogonal to the optical axis AZ may be applied.

  Hereinafter, the shake correction unit 74 (an example of the shake correction apparatus) according to the present embodiment will be specifically described. FIG. 18 is a perspective view of the shake correction unit. FIG. 19 is an exploded perspective view showing the configuration of the shake correction unit. FIG. 20 is an exploded perspective view from another direction showing the configuration of the shake correction unit.

  First, the second support frame 58 (an example of a reference frame) will be described. The second support frame 58 is formed with a first fixing portion 58L and a second fixing portion 58S. A first pole 96L (an example of a first position regulating member) is fixed to the first fixing portion 58L by press-fitting. A second pole 96S (an example of a second position restricting member) is fixed to the second fixing portion 58S by press-fitting. That is, the first pole 96L and the second pole 96S are fixed to the second support frame 58. The first pole 96L has a shape extending in a direction orthogonal to the optical axis AZ, and specifically, a cylindrical shape orthogonal to the optical axis AZ. Similarly, the second pole 96S has a shape extending in a direction orthogonal to the optical axis AZ, and specifically, a cylindrical shape orthogonal to the optical axis AZ. Further, the longitudinal direction of the first pole 96L and the longitudinal direction of the second pole 96S are not parallel.

  A flexible printed cable (hereinafter also referred to as FPC) 94 is attached to the front surface of the second support frame 58. The FPC 94 is disposed between the second support frame 58 and the first support frame 57. A pitch Hall element 78 and a yaw Hall element 79 are electrically connected to the FPC 94. The pitch Hall element 78 detects the position of the first support frame 57 with respect to the second support frame 58 in the pitching direction (an example of the first direction). The yaw Hall element 79 detects the position of the first support frame 57 relative to the second support frame 58 in the yawing direction (an example of the second direction). The pitch direction and the yaw direction are both directions orthogonal to the optical axis AZ. The pitching direction is parallel to the X-axis direction, and the yawing direction is parallel to the Y-axis direction. The pitch Hall element 78 and the yaw Hall element 79 are examples of the position detection sensor 47.

  Further, a pitch fine pattern coil (hereinafter also referred to as a pitch FP coil) 92C and a yaw fine pattern coil (hereinafter also referred to as a yaw FP coil) 93C are electrically connected to the FPC 94. Specifically, electrical terminals (not shown) are respectively exposed on the negative surfaces of the pitch FP coil 92C and the yaw FP coil 93C in the Z-axis direction. Each electrical terminal and a pattern exposed portion provided on the front surface of the FPC 94 are electrically connected by soldering or the like. One end (not shown) of the FPC 94 is connected to the shake correction microcomputer 48. Then, a signal from the position detection sensor 47 is read, and a voltage is applied to the pitch FP coil 92C and the yaw FP coil 93C. A positioning hole 92D and a rotation stop hole 92E are formed in the pitch FP coil 92C. The positioning hole 92D and the rotation stop hole 92E are engaged with a positioning boss 58D and a rotation stop boss 58E formed in the second support frame 58, respectively. Thus, the position of the pitch FP coil 92C with respect to the second support frame 58 in a plane perpendicular to the optical axis is determined. The pitch FP coil 92C is fixed to the second support frame 58 by welding the positioning hole 92D and the positioning boss 58D and welding the rotation stop hole 92E and the rotation stop boss 58E. Accordingly, the position of the optical axis of the pitch FP coil 92C with respect to the second support frame 58 is determined. Similarly, the yaw FP coil 93 </ b> C is fixed to the second support frame 58.

  A shaft 69 (an example of a rotating shaft) is fixed to the second support frame 58. The shaft 69 is disposed in parallel with the optical axis AZ, and the end on the negative side in the Z-axis direction is press-fitted into the second support frame 58. Further, the eighth lens L8 and the ninth lens L9 are fixed to the second support frame 58 by heat caulking.

  Next, the first support frame 57 (an example of a movable frame) will be described. A seventh lens L7 (an example of a shake correction lens group) is fixed to the first support frame 57 by heat caulking.

  The pitch magnet 92M and the yaw magnet 93M are two-pole magnetized on one side. On the back surface of the first support frame 57, concave magnet fixing portions 57x and 57y are formed. A pitch magnet 92M and a pitch yoke 92Y are inserted into the magnet fixing portion 57y. The pitch magnet 92M is fixed to the first support frame 57 by fixing means such as an ultraviolet curable adhesive applied to the adhesive application space 57e. Similarly, the yaw magnet 93M and the yaw yoke 93Y are inserted into the magnet fixing portion 57x and fixed to the first support frame 57. The pitch FP coil 92C and the pitch magnet 92M are examples of the first drive unit. By energizing the pitch FP coil 92 </ b> C, the pitch FP coil 92 </ b> C and the pitch magnet 92 </ b> M give a driving force in the pitching direction to the first support frame 57. The yaw FP coil 93C and the yaw magnet 93M are examples of the second drive unit. By energizing the yaw FP coil 93C, the yaw FP coil 93C and the yaw magnet 93M give a driving force in the yawing direction to the first support frame 57.

  The first support frame 57 is formed with a first claw portion 57L (an example of a first engagement portion) and a second claw portion 57S (an example of a second engagement portion). The first claw portion 57L has a U-groove shape that opens in a direction perpendicular to the optical axis AZ, and specifically, the X-axis direction negative side is open. The second claw portion 57S has a U-groove shape opened in a direction perpendicular to the optical axis AZ, and specifically, the Y-axis direction negative side is open. The first claw portion 57L and the second claw portion 57S are engaged with the first pole 96L and the second pole 96S, respectively. Specifically, the first claw portion 57L and the second claw portion 57S sandwich the first pole 96L and the second pole 96S from the optical axis AZ direction, respectively. As a result, the movement of the first support frame 57 in the optical axis AZ direction with respect to the second support frame 58 is restricted. Further, the first support frame 57 is movable with respect to the second support frame 58 in a plane orthogonal to the optical axis AZ.

  The first claw portion 57L covers the first pole 96L when viewed in the optical axis direction from the front. In other words, the first claw portion 57L includes a first light shielding portion, and prevents the first pole 96L from being exposed to light. The second claw portion 57S covers the second pole 96S when viewed in the optical axis direction from the front. That is, the 2nd nail | claw part 57S contains the 2nd light-shielding part, and has prevented that 2nd pole 96S hits light. In other words, the first claw portion 57L is an example of a first light shielding portion that is disposed on the subject side of the first pole 96L and covers the first pole 96L from the subject side. The second claw portion 57S is an example of a second light shielding portion that is disposed on the subject side of the second pole 96S and covers the second pole 96S from the subject side. That is, in this embodiment, the 1st light shielding part is formed integrally with the 1st engaging part, and the 2nd light shielding part is formed integrally with the 2nd engaging part.

  The first support frame 57 is formed with a groove 57c (an example of a rotating shaft engaging portion). The groove 57c is open on the side where the shaft 69 is disposed (Z-axis direction negative side). In addition, the groove 57c is open in the opening direction (X-axis direction negative side) of the first claw portion 57L. The groove 57c has a shape in which the longitudinal direction is orthogonal to the optical axis AZ. The groove 57 c engages with the shaft 69. Specifically, the groove 57c sandwiches the shaft 69 from the longitudinal direction of the groove 57c and the direction orthogonal to the optical axis, and restricts the movement of the first support frame 57 relative to the second support frame 58 in that direction. Thereby, the first support frame 57 moves in a plane perpendicular to the optical axis AZ with respect to the second support frame 58 in a linear direction perpendicular to the optical axis AZ, specifically, the longitudinal direction of the groove 57c and the shaft. The rotation direction is centered on 69. The first support frame 57 is driven in the rotational direction about the shaft 69 with respect to the second support frame 58 by the driving force in the pitching direction provided by the pitch FP coil 92C and the pitch magnet 92M. The first support frame 57 is driven in the longitudinal direction of the groove 57c with respect to the second support frame 58 by the driving force in the yawing direction provided by the yaw FP coil 93C and the yaw magnet 93M.

  The distance between the first claw portion 57L and the shaft 69 in the yawing direction is smaller than the distance between the second claw portion 57S and the shaft 69 in the yawing direction.

  The first support frame 57 is formed with a movement range regulating hole 57d penetrating in the optical axis AZ direction. A movement range restriction pin 70 is press-fitted and fixed to the second support frame 58 in parallel with the optical axis AZ. The positions in the optical axis AZ direction of the movement range restriction pin 70 and the movement range restriction hole 57d overlap. This prevents the first support frame 57 from being detached from the second support frame 58. At the same time, by defining the shape of the movement range regulating hole 57d, the movable range of the seventh lens L7 supported by the first support frame 57 is determined. Even when there is the seventh lens L7 supported by the first support frame 57 at any position within this movable range, the first claw portion 57L covers the first pole 96L when viewed from the front in the optical axis direction. The second claw portion 57S covers the second pole 96S when viewed in the optical axis direction from the front.

  Next, a method for manufacturing the shake correction unit 74 will be described. FIG. 26 is a flowchart of a method for manufacturing the shake correction unit 74. FIG. 21 is a diagram illustrating the shake correction unit after the first manufacturing process. FIG. 22 is a diagram illustrating the shake correction unit after the second manufacturing process. FIG. 23 is a diagram illustrating the shake correction unit after the third manufacturing process. FIG. 24 is a diagram illustrating the shake correction unit after the fourth manufacturing process.

  First, the first pole 96L and the second pole 96S, the pitch FP coil 92C and the yaw FP coil 93C, the FPC 94, the shaft 69, the cam pin 80, the eighth lens L8, and the ninth lens L9 are press-fitted into the second support frame 58, heat It is fixed by caulking etc. (Step S81). Then, the shake correction unit 74 is in the state shown in FIG.

  The pitch magnet 92M, the pitch yoke 92Y, the yaw magnet 93M, and the yaw yoke 93Y are bonded to the first support frame 57, and the seventh lens L7 is fixed by heat caulking (step S82).

  Next, the first support frame 57 is inserted into the second support frame 58 in steps S83 to S86. Here, the positional relationship between the first support frame 57 and the second support frame 58 in the state shown in FIG. 24 will be described as a reference state.

  The first support frame 57 is inclined by 5 ° counterclockwise from the reference state in the XY plane (FIG. 22A). Further, the first support frame 57 is inclined by 9 ° counterclockwise from the reference state in the ZX plane (FIG. 22B) (step S83). Then, with these inclinations maintained, the first pawl portion 57L of the first support frame 57 is engaged with the first pole 96L, and the groove 57c is engaged with the shaft 69 (step S84). Then, the shake correction unit 74 is in the state shown in FIG.

  Next, the first support frame 57 is rotated 9 ° clockwise around the first pole 96L in the ZX plane. Then, the position of the first support frame 57 in the ZX plane is set to the reference state (step S85). Then, the shake correction unit 74 is in the state shown in FIG. Here, the first support frame 57 remains inclined at 5 ° counterclockwise with respect to the reference state around the shaft 69 in the XY plane. In this state, the first support frame 57 does not contact the second pole 96S and the fixing portion 58S.

  Next, the first support frame 57 is rotated 5 ° clockwise around the shaft 69 in the XY plane. Then, the position of the first support frame 57 in the XY plane is set to the reference state (step S86). At this time, the first support frame 57 rotates without causing interference with the second support frame 58 and the second pole 96S. Then, the second pawl portion 57S of the first support frame 57 and the second pole 96S are engaged. Thus, the first support frame 57 is in the reference state. As described above, the second claw portion 57S and the second pole 96S are engaged with the second claw portion 57S and the second pole 96S in a state where the first claw portion 57L and the first pole 96L are engaged. It is arranged so that the joint is removable. Further, the second claw portion 57S and the second pole 96S are in a state where the first claw portion 57L and the first pole 96L are engaged, and the groove 57c and the shaft 69 are engaged. It arrange | positions so that engagement with the part 57S and the 2nd pole 96S can be attached or detached. Specifically, the second claw portion 57 </ b> S and the second pole 96 </ b> S are disposed at a position where the center intersects the virtual circle C <b> 1 whose center is the shaft 69.

  Thereafter, the movement range restriction pin 70 is press-fitted into the second support frame 58 through the movement range restriction hole 57d of the first support frame 57 (step S87). Then, the shake correction unit 74 is in the state shown in FIG.

(6) Lens microcomputer 40 The lens microcomputer 40 has a CPU (not shown), a ROM (not shown), and a memory 40a, and various functions are realized by reading a program stored in the ROM into the CPU. Can be realized. For example, the lens microcomputer 40 can recognize from the detection signal of the photosensor 67 that the focus lens unit 75 is at the origin position.

  The memory 40a is a non-volatile memory and can hold stored information even when power supply is stopped. For example, information (lens information) regarding the interchangeable lens unit 2 and a tracking table (described later) for realizing a zoom lens system are stored in the memory 40a. The lens microcomputer 40 controls the focus motor 64 based on this tracking table, and the focus lens unit 75 is driven in the Z-axis direction by the focus motor 64. Hereinafter, the operation of causing the position of the focus lens unit 75 to follow the change in the focal length based on the tracking table is referred to as electronic tracking.

  The lens microcomputer 40 has a counter 40 b for counting the number of pulses of the focus motor 64. The counter 40b sets the count to “+1” when the focus lens unit 75 is driven to the positive side in the Z-axis direction, and sets the count to “−1” when the focus lens unit 75 is driven to the negative side in the Z-axis direction. Thus, by counting the number of driving pulses of the focus motor 64 with the counter 40b, the lens microcomputer 40 can determine the relative position of the third lens group G3 with respect to the second lens group G2 (the focus lens unit with respect to the second lens group unit 77). 75 positions).

  For example, the rack 66 is driven in the Z-axis direction by 0.6 mm per rotation of the lead screw 64a of the focus motor 64. When the focus motor 64 having a magnet (not shown) having 10 poles is driven by 1-2 phase excitation, the rack 66 is Z-axis by 0.6 / 20/2 = 0.015 mm (15 μm) per pulse. Driven in the direction. At the time of microstep driving, the rack 66 can be driven in a finer unit. By using the stepping motor, the focus lens unit 75 can be driven in fine units, and for example, backlash during reverse driving can be reduced. That is, by selecting a stepping motor as the focus motor 64, highly accurate focus adjustment can be realized. Further, by counting the number of drive pulses, the current position of the focus lens unit 75 relative to the second lens group unit 77 can be grasped, and the drive amount of the focus lens unit 75 can be calculated.

<Camera body>
A schematic configuration of the camera body 3 will be described with reference to FIGS. As shown in FIGS. 1 to 4B, the camera body 3 includes a housing 3a, a body mount 4, an operation unit 39, an image acquisition unit 35, an image display unit 36, a finder unit 38, A body microcomputer 10 (an example of a drive control unit, an example of a preliminary operation detection unit) and a battery 22 (an example of a main power source) are included.

(1) Case The case 3 a constitutes the exterior part of the camera body 3. As shown in FIGS. 4A and 4B, a body mount 4 is provided on the front surface of the housing 3a, and an operation unit 39 is provided on the back and top surfaces of the housing 3a. Yes. Specifically, on the back surface of the housing 3a, the display unit 20, the power switch 25, the mode switching dial 26, the cross operation key 27, the menu setting button 28, the setting button 29, and the mode switching button 34 are displayed. In addition, a moving image shooting operation button 24 is provided. A shutter button 30 is provided on the upper surface of the housing 3a.

(2) Body Mount The body mount 4 is a portion to which the lens mount 95 of the interchangeable lens unit 2 is attached, and has a body side contact (not shown) that can be electrically connected to the lens side contact 91. . The camera body 3 can transmit and receive data to and from the interchangeable lens unit 2 via the body mount 4 and the lens mount 95. For example, the body microcomputer 10 (described later) transmits a control signal such as an exposure synchronization signal to the lens microcomputer 40 via the body mount 4 and the lens mount 95.

(3) Operation Unit As shown in FIGS. 4A and 4B, the operation unit 39 has various operation members for the user to input operation information. For example, the power switch 25 is a switch for turning on / off the power of the digital camera 1 or the camera body 3. When the power is turned on by the power switch 25, power is supplied to each part of the camera body 3 and the interchangeable lens unit 2.

  The mode switching dial 26 is a dial for switching operation modes such as a still image shooting mode, a moving image shooting mode, and a reproduction mode, and the user can switch the operation mode by rotating the mode switching dial 26. When the still image shooting mode is selected with the mode switching dial 26, the operation mode can be switched to the still image shooting mode. When the moving image shooting mode is selected with the mode switching dial 26, the operation mode is switched to the moving image shooting mode. be able to. In the movie shooting mode, movie shooting is basically possible. Furthermore, when the playback mode is selected by the mode switching dial 26, the operation mode can be switched to the playback mode, and the captured image can be displayed on the display unit 20.

  The cross operation key 27 is a button that allows the user to select the vertical and horizontal directions. For example, a desired menu can be selected from various menu screens displayed on the display unit 20 by using the cross operation key 27.

  The menu setting button 28 is a button for setting various operations of the digital camera 1. The setting button 29 is a button for confirming execution of various menus.

  The moving image shooting operation button 24 is a button for instructing start and stop of moving image shooting. Even if the operation mode selected with the mode switching dial 26 is the still image shooting mode or the playback mode, pressing the moving image shooting operation button 24 forces the operation regardless of the setting content with the mode switching dial 26. The mode shifts to the movie shooting mode, and movie shooting is started. Further, when the moving image shooting operation button 24 is pressed during moving image shooting, the moving image shooting is terminated, and the operation mode selected by the mode switching dial 26, that is, the operation mode before starting moving image shooting is shifted to. For example, when the still image shooting mode is selected by the mode switching dial 26 when the moving image shooting operation button 24 is pressed, the operation mode is automatically set to the still image shooting mode after the moving image shooting operation button 24 is pressed again. Migrate to

  The shutter button 30 is operated by the user during shooting. When the shutter button 30 is operated, a timing signal is output to the body microcomputer 10. The shutter button 30 is a two-stage switch that can be pressed halfway and fully. When the user performs a half-press operation, photometry processing and distance measurement processing are started. When the user fully presses the shutter button 30 while the shutter button 30 is half-pressed, a timing signal is output, and the image acquisition unit 35 acquires image data.

  Further, as shown in FIG. 2, a lens removal button 99 (an example of a lens removal operation unit and an example of a preliminary operation detection unit) for removing the interchangeable lens unit 2 from the camera body 3 is provided on the front surface of the camera body 3. It has been. The lens removal button 99 has, for example, a contact (not shown) that is turned on when pressed by the user, and is electrically connected to the body microcomputer 10. When the lens removal button 99 is pressed, the built-in contact is turned on, and the body microcomputer 10 can recognize that the lens removal button 99 has been pressed.

(4) Image Acquisition Unit The image acquisition unit 35 mainly includes an image sensor 11 (an example of an image sensor) such as a CCD (Charge Coupled Device) that performs photoelectric conversion, and a shutter unit 33 that adjusts the exposure state of the image sensor 11. The shutter control unit 31 controls the drive of the shutter unit 33 based on the control signal from the body microcomputer 10, and the image sensor drive control unit 12 controls the operation of the image sensor 11.

  The imaging sensor 11 is, for example, a CCD (Charge Coupled Device) sensor that converts an optical image formed by the optical system L into an electrical signal. The image sensor 11 is driven and controlled by a timing signal generated by the image sensor drive control unit 12. The imaging sensor 11 may be a CMOS (Complementary Metal Oxide Semiconductor) sensor.

  The shutter control unit 31 drives the shutter drive actuator 32 and operates the shutter unit 33 according to the control signal output from the body microcomputer 10 that has received the timing signal.

  In the present embodiment, a contrast detection method using image data generated by the image sensor 11 is employed as the autofocus method. By using the contrast detection method, highly accurate focus adjustment can be realized.

(5) Body Microcomputer The body microcomputer 10 is a control device that controls the center of the camera body 3 and controls each part of the digital camera 1 according to the operation information input to the operation unit 39. Specifically, the body microcomputer 10 is equipped with a CPU, a ROM, and a RAM, and the body microcomputer 10 can realize various functions by reading a program stored in the ROM into the CPU. For example, the body microcomputer 10 acquires a function for detecting that the interchangeable lens unit 2 is attached to the camera body 3 or information necessary for controlling the digital camera 1 such as focal length information from the interchangeable lens unit 2. It has a function.

  The body microcomputer 10 can receive signals from the power switch 25, the shutter button 30, the mode switching dial 26, the cross operation key 27, the menu setting button 28, and the setting button 29, respectively. Various information regarding the camera body 3 is stored in the memory 10 a in the body microcomputer 10. The memory 10a is a non-volatile memory and can hold stored information even when power supply is stopped.

  The body microcomputer 10 periodically generates a vertical synchronization signal, and generates an exposure synchronization signal based on the vertical synchronization signal in parallel with the generation of the vertical synchronization signal. Since the body microcomputer 10 knows in advance the exposure start timing and exposure end timing based on the vertical synchronization signal, the body microcomputer 10 can generate the exposure synchronization signal. The body microcomputer 10 outputs a vertical synchronization signal to a timing generator (not shown), and outputs an exposure synchronization signal to the lens microcomputer 40 via the body mount 4 and the lens mount 95 at a constant cycle. The lens microcomputer 40 acquires position information of the focus lens unit 75 in synchronization with the exposure synchronization signal.

  The image sensor drive control unit 12 generates a read signal of the image sensor 11 and an electronic shutter drive signal at a constant period based on the vertical synchronization signal. The image sensor drive control unit 12 drives the image sensor 11 based on the readout signal and the electronic shutter drive signal. That is, the imaging sensor 11 reads out pixel data generated by a large number of photoelectric conversion elements (not shown) in the imaging sensor 11 to a vertical transfer unit (not shown) in accordance with the readout signal.

  The body microcomputer 10 controls a focus adjustment unit 72 (described later) via the lens microcomputer 40.

  The image signal output from the image sensor 11 is sequentially sent from the analog signal processing unit 13 to the A / D conversion unit 14, the digital signal processing unit 15, the buffer memory 16, and the image compression unit 17 for processing. The analog signal processing unit 13 performs analog signal processing such as gamma processing on the image signal output from the imaging sensor 11. The A / D conversion unit 14 converts the analog signal output from the analog signal processing unit 13 into a digital signal. The digital signal processing unit 15 performs digital signal processing such as noise removal and edge enhancement on the image signal converted into a digital signal by the A / D conversion unit 14. The buffer memory 16 is a RAM (Random Access Memory) and temporarily stores an image signal. The image signals stored in the buffer memory 16 are sequentially sent from the image compression unit 17 to the image recording unit 18 for processing. The image signal stored in the buffer memory 16 is read by an instruction of the image recording control unit 19 and transmitted to the image compression unit 17. The image signal data transmitted to the image compression unit 17 is compressed into an image signal in accordance with an instruction from the image recording control unit 19. The image signal has a smaller data size than the original data by this compression processing. As a method for compressing an image signal, for example, a JPEG (Joint Photographic Experts Group) method for compressing each frame image signal is used. Thereafter, the compressed image signal is recorded in the image recording unit 18 by the image recording control unit 19. Here, when a moving image is recorded, a JPEG method in which a plurality of image signals are compressed for each image signal of one frame can be used. H.264 / AVC format can also be used.

  The image recording unit 18 creates a still image file or a moving image file by associating an image signal with predetermined information to be recorded based on an instruction from the image recording control unit 19. Then, the image recording unit 18 records a still image file or a moving image file based on a command from the image recording control unit 19. The image recording unit 18 is, for example, an internal memory and / or a detachable removable memory. Note that the predetermined information to be recorded together with the image signal includes the date and time when the image was captured, focal length information, shutter speed information, aperture value information, and shooting mode information. The still image file has a format similar to, for example, the Exif (registered trademark) format or the Exif (registered trademark) format. The moving image file is, for example, H.264. H.264 / AVC format and H.264 format. This format is similar to the H.264 / AVC format.

(6) Image Display Unit The image display unit 36 includes a display unit 20 and an image display control unit 21. The display unit 20 is a liquid crystal monitor, for example. The display unit 20 displays the image signal recorded in the image recording unit 18 or the buffer memory 16 as a visible image based on a command from the image display control unit 21. As a display form on the display unit 20, a display form in which only an image signal is displayed as a visible image and a display form in which the image signal and information at the time of photographing are displayed as a visible image are conceivable.

(7) Finder Unit The finder unit 38 includes a liquid crystal finder 8 that displays an image acquired by the imaging sensor 11, and a finder eyepiece window 9 provided on the back surface of the housing 3a. The user can view the image displayed on the liquid crystal finder 8 by looking through the finder eyepiece window 9.

(8) Battery The battery 22 supplies power to each part of the camera body 3 and further supplies power to the interchangeable lens unit 2 via the lens mount 95. In the present embodiment, the battery 22 is a rechargeable battery. The battery 22 may be a dry battery or an external power source that is externally supplied with power by a power cord.

<Tracking table>
In the digital camera 1, electronic tracking is performed by the focus adjustment unit 72 so that the focal length can be changed while keeping the subject distance substantially constant. Specifically, as shown in FIG. 14, a tracking table 100 is stored in the memory 40a in order to perform electronic tracking. This tracking table 100 shows the relationship between the rotation position of the zoom ring 84 and the position of the focus lens unit 75 in the Z-axis direction with respect to the second lens group unit 77. For example, three tracking tables 100 corresponding to subject distances of 0.3 m, 1.0 m, and infinity (∞) are stored in the memory 40a.

  The tracking table 100 is discrete information in which the rotational position of the zoom ring 84 and the position of the focus lens unit 75 in the Z-axis direction are divided into several parts. In general, the number of divisions is determined so that the subject distance is within a predetermined depth of field even when the zoom ring 84 is rotated.

  The rotation position (position in the rotation direction) of the zoom ring 84 can be detected by the linear position sensor 87. Based on the detection result and the tracking table 100, the lens microcomputer 40 can determine the position of the focus lens unit 75 in the Z-axis direction with respect to the second lens group unit 77.

  The origin position D of the focus lens unit 75 with respect to the second lens group unit 77 is detected by the photosensor 67, and is indicated by a one-dot chain line in FIG. In the present embodiment, the origin position D is located near the center of the movement range (between the position E1 and the position E2) of the focus lens unit 75 in the tracking table 100 at infinity. In this way, by arranging the origin position D near the center, the focus lens unit 75 can be moved relatively quickly to any position when the digital camera 1 is powered on.

  Note that the origin position D is determined based on the tracking table 100 at infinity when the user turns on the digital camera 1 to shoot the subject and the probability of shooting the subject at the infinity position. Is high.

  The tracking table 100 may be represented by a polynomial instead of discrete information divided into several parts. Instead of the rotation position of the zoom ring 84, position information in the Z-axis direction of the first lens group G1, the second lens group G2, or the fourth lens group G4 may be used. The position of the focus lens unit 75 in the Z-axis direction with respect to the second lens group unit 77 is the position of the third lens group G3 in the Z-axis direction with respect to the second lens group unit 77 or the third lens with respect to the second lens group G2. In other words, the position of the group G3 in the Z-axis direction.

<Operation of digital camera>
The operation of the digital camera 1 will be described.

(1) Shooting mode The digital camera 1 has two shooting modes. Specifically, the digital camera 1 has a finder photographing mode in which the user observes the subject through the finder eyepiece window 9 and a monitor photographing mode in which the user observes the subject through the display unit 20.

  In the finder shooting mode, for example, the image display control unit 21 drives the liquid crystal finder 8. As a result, an image of the subject (so-called through image) acquired by the image sensor 11 is displayed on the liquid crystal finder 8.

  In the monitor photographing mode, for example, the display unit 20 is driven by the image display control unit 21, and a real-time image of the subject is displayed on the display unit 20. Switching between the two shooting modes can be performed by a shooting mode switching button 34.

(2) Zoom Operation Next, the operation of the interchangeable lens unit 2 when the user performs a zoom operation will be described.

  When the zoom ring 84 is rotated by the user, the cam cylinder 51 rotates together with the zoom ring 84. When the cam cylinder 51 rotates around the optical axis AZ, the first holder 52 is guided by the first cam groove 51d of the cam cylinder 51 and advances straight in the Z-axis direction. Further, the second holder 55 and the fourth lens group support frame 61 are also guided by the second cam groove 51b and the third cam groove 51c of the cam cylinder 51, and advance straight in the Z-axis direction. Therefore, by rotating the zoom ring 84, the state of the interchangeable lens unit 2 can be changed from the wide-angle end state shown in FIGS. 5 and 6 to the telephoto end state shown in FIGS. Thus, the subject can be photographed at a desired zoom position by adjusting the rotation position of the zoom ring 84.

  At this time, the second holder 55 is mechanically driven in the Z-axis direction by the rotation operation of the zoom ring 84, but only the focus lens unit 75 has the memory 40a so that the subject distance is kept substantially constant. The focus adjustment unit 72 is electrically driven and controlled based on the tracking table 100 stored in advance. For example, when the focus lens unit 75 is driven by the focus motor 64 based on the tracking table 100, focusing is performed at infinity even when moving from the wide-angle end to the telephoto end or when moving from the telephoto end to the wide-angle end. Maintain state.

(3) Still Image Shooting The body microcomputer 10 sets the aperture value of the optical system L to the aperture value calculated based on the photometric output of the image sensor 11 when the shutter button 30 is fully pressed by the user. A command is transmitted to the lens microcomputer 40. Then, the aperture driving control unit 42 is controlled by the lens microcomputer 40, and the aperture unit 62 is narrowed down to the instructed aperture value. Simultaneously with the aperture value instruction, a drive command is transmitted from the image sensor drive control unit 12 to the image sensor 11, and a drive command for the shutter unit 33 is transmitted. The image sensor 11 is exposed by the shutter unit 33 for the time of the shutter speed calculated based on the photometric output of the image sensor 11.

  When the operation mode of the shake correction unit 74 is ON, the shake correction unit 74 performs a shake correction operation described later at least while the image sensor 11 is exposed.

  The body microcomputer 10 executes a photographing process and transmits a control signal to the image recording control unit 19 when the photographing is completed. The image recording unit 18 records the image signal in the internal memory and / or the removable memory based on a command from the image recording control unit 19. The image recording unit 18 records information on the shooting mode (autofocus shooting mode or manual focus shooting mode) in the internal memory and / or the removable memory together with the image signal based on a command from the image recording control unit 19.

  Further, after the exposure is completed, the image sensor drive control unit 12 reads the image data from the image sensor 11, and after predetermined image processing, the image data is output to the image display control unit 21 via the body microcomputer 10. As a result, the captured image is displayed on the display unit 20.

  Further, after the exposure is completed, the shutter unit 33 is reset to the initial position by the body microcomputer 10. Also, a command is sent from the body microcomputer 10 to the lens microcomputer 40 to the aperture drive control unit 42 to reset the aperture unit 62 to the open position, and a reset command is issued from the lens microcomputer 40 to each unit. After the reset is completed, the lens microcomputer 40 notifies the reset to the body microcomputer 10. The body microcomputer 10 confirms that the shutter button 30 has not been pressed after receiving the reset completion information from the lens microcomputer 40 and completing a series of processes after exposure, and ends the photographing sequence. To do.

(4) Movie shooting The digital camera 1 also has a function of shooting a movie. In the moving image shooting mode, image data is generated by the imaging sensor 11 at a constant cycle, and autofocus by a contrast detection method is continuously performed using the generated image data. In the movie shooting mode, when the shutter button 30 or the movie shooting operation button 24 is pressed, a movie is recorded in the image recording unit 18, and when the shutter button 30 or the movie shooting operation button 24 is pressed again, the image is recorded. Recording of the moving image in the recording unit 18 stops.

  When the operation mode of the shake correction unit 74 is ON, the shake correction unit 74 performs a shake correction operation to be described later at least while a moving image is recorded.

(5) Shake Correction Operation Shake applied to the digital camera 1 is detected by the shake detection unit. The shake detection unit includes a first angular velocity sensor that detects shake in the pitching direction (Y direction) and a second angular velocity sensor that detects shake in the yawing direction (X direction). The shake correction microcomputer 48 integrates the output signals obtained by the first angular velocity sensor and the second angular velocity sensor with respect to time and converts them into shake angle information of the digital camera 1 in the pitching direction and yawing direction. The shake correcting microcomputer 48 calculates target position information of the seventh lens L7 for returning the movement of the optical image on the imaging surface caused by the shake of the digital camera 1 based on the shake angle information. In order to move the seventh lens L7 in accordance with the target position information, the shake correction microcomputer 48 calculates the difference between the target position information and the current position information of the seventh lens L7 detected by the position detection sensor 47. Then, a signal is transmitted to the pitch actuator 92 and / or the yaw actuator 93.

  The pitch actuator 92 and / or the yaw actuator 93 drives the seventh lens L7 based on this signal. Specifically, a current is passed through the pitch FP coil 92C through the FPC 94, and a driving force is applied in the pitching direction (Y direction) to drive the first support frame 57 that supports the seventh lens L7 in the pitching direction (Y direction). To do. In addition, a current is passed through the yaw FP coil 93C through the FPC 94, and a driving force acts in the yawing direction (X direction), thereby driving the first support frame 57 that supports the seventh lens L7 in the yawing direction (X direction). Thus, the shake of the subject image caused by the shake of the digital camera 1 is corrected.

[Other Embodiments]
Embodiments of the present invention are not limited to the above-described embodiments, and various modifications and changes can be made without departing from the spirit of the present invention. The above-described embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its application, or its use.

(1)
In the above-described embodiment, the digital camera can shoot still images and moving images, but may only shoot still images or only moving images.

(2)
In the above-described embodiment, the digital camera may be, for example, a digital still camera, a digital video camera, a camera phone, and a camera PDA.

(3)
The digital camera 1 described above does not have a quick return mirror, but a quick return mirror may be mounted like a conventional single-lens reflex camera.

(4)
The configuration of the optical system L is not limited to the above-described embodiment. For example, the third lens group G3 may be composed of a plurality of lenses, and the second lens group G2 may be composed of a single lens.

(5)
In the above-described embodiment, the exposure time to the image sensor 11 is controlled by operating the shutter unit 33, but the exposure time of the image sensor 11 may be controlled by an electronic shutter.

(6)
In the above-described embodiment, electronic tracking is performed by the lens microcomputer 40. However, a command may be transmitted from the body microcomputer 10 to the lens microcomputer 40, and electronic tracking may be controlled based on the command.

(7)
The groove 57 c may be formed in the second support frame 58 and the shaft 69 may be provided in the first support frame 57. Even in this case, the movement of the first support frame 57 in the plane orthogonal to the optical axis AZ relative to the second support frame 58 is linear in the direction orthogonal to the optical axis AZ, specifically the longitudinal direction of the groove 57c. The rotation direction around the shaft 69 is restricted. Further, in this case, the groove 57c is opened on the side where the shaft 69 is disposed (Z-axis direction positive side), and is opposite to the opening direction of the first claw portion 57L (X-axis direction positive side). ) Is preferably open. Thus, the step of engaging the first pawl portion 57L with the first pole 96L and the step of engaging the groove 57c with the shaft 69 can be performed in one step.

(8)
As shown in FIG. 25A, the first position restricting member that restricts the optical axis direction is the first pole 96L, and the first engaging portion is the first claw portion 57L. However, the present invention is not limited to this. For example, the first position regulating member may be a prism as shown in FIG. Further, as shown in FIG. 25C, the first position restricting member may be a U-groove, and the first system coupling portion may be a pole. That is, it is only necessary that the first system coupling portion is regulated in the optical axis AZ direction by engaging the first position regulating member and the first system coupling portion. Similarly, for the second position restricting member and the second engaging portion, if the second position restricting member and the second system coupling portion are engaged, the second system coupling portion is regulated in the optical axis AZ direction. Any configuration is possible.

(9)
In the above-described embodiment, the pitch magnet 92M, the pitch yoke 92Y, the yaw magnet 93M, and the yaw yoke 93Y are bonded to the first support frame 57, and the pitch FP coil 92C and the yaw FP coil 93C are fixed to the second support frame 58. . Conversely, the pitch FP coil 92C and the yaw FP coil 93C are fixed to the first support frame 57, and the pitch magnet 92M, the pitch yoke 92Y, the yaw magnet 93M, and the yaw yoke 93Y are fixed to the second support frame 58. The same effect is produced. Further, the pitch yoke 92Y and the yaw yoke 93Y may be omitted, or a so-called winding coil may be used instead of the pitch FP coil 92C and the yaw FP coil 93C.

(10)
In the above-described embodiment, a part of the first support frame 57 shields the subject of the first pole 96L and the second pole 96S from light. However, for example, the shaft 69, the FPC 94, or the pitch FP coil is used. A configuration may be adopted in which the light shielding portion formed on the first support frame 57 shields the subject side of 92C.

(11)
The first light shielding portion described above is formed integrally with the first claw portion 57L. However, the first light shielding portion may be formed on the first support frame 57 separately from the first claw portion 57L. Further, the first light shielding portion may be formed on the second support frame 58. For example, the first light shielding part may be formed integrally with the first fixing part 58L. Similarly, the second light shielding portion may be formed on the first support frame 57 separately from the second claw portion 57S. Further, the second light shielding portion may be formed on the second support frame 58. For example, the second light shielding part may be formed integrally with the second fixing part 58S.

(12)
Both or one of the positioning boss 58A (an example of a positioning part) and the rotation stop boss 58B (an example of a positioning part) may be formed on the third support frame 59. A leaf spring 59C may be provided on the second support frame 58.

[Features of the embodiment]
The features of the embodiment are listed below. The invention included in the embodiment is not limited to the following.

(1)
A shake correction device,
A reference frame,
A movable frame that supports the shake correction lens group and is movable with respect to the reference frame in a plane orthogonal to the optical axis of the shake correction lens group;
A first driving unit that applies a driving force in a first direction perpendicular to the optical axis to the movable frame;
A second driving unit that applies a driving force in a second direction perpendicular to the optical axis to the movable frame;
A pole fixed to the reference frame and having a shape extending in a direction perpendicular to the optical axis;
A first engaging portion that is formed on the movable frame, engages with the first pole, and restricts movement of the movable frame relative to the reference frame in the optical axis direction;
A second engaging portion that is formed on the movable frame, engages with the second pole, and restricts movement of the movable frame relative to the reference frame in the optical axis direction;
A first light-shielding portion disposed on the subject side of the first pole and covering the first pole from the subject side;
A second light-shielding portion disposed on the subject side of the second pole and covering the second pole from the subject side.

  Thereby, it is possible to prevent the light from hitting the pole and reduce the occurrence of flare and ghost.

(2)
The shake correction apparatus according to 1, wherein
In all the positional relationships in which the movable frame can move with respect to the reference frame, the first light shielding portion covers the first pole from the subject side, and the second light shielding portion covers the second pole from the subject side. .

  This can reduce the occurrence of flare and ghost even during the shake correction operation.

(3)
The shake correction apparatus according to 1 or 2, wherein
The first light shielding part and the second light shielding part are formed on the movable frame.

  Thereby, the number of parts can be reduced.

(4)
The first light shielding portion is formed integrally with the first engagement portion,
The second light shielding portion is formed integrally with the second engaging portion.
As a result, the number of parts can be reduced, and when used in a lens barrel or the like, the lens barrel or the like can be reduced in size.

(5)
A lens barrel, comprising the shake correction device according to any one of 1 to 4.

(6)
An imaging apparatus, comprising the shake correction apparatus according to any one of 1 to 4.

  The present invention is suitable for imaging apparatuses such as a digital still camera, a digital video camera, an interchangeable lens type digital camera, a camera-equipped mobile phone, and a camera-equipped PDA.

Schematic configuration diagram of digital camera Block diagram showing the configuration of the camera body Schematic perspective view of digital camera (A) Top view of camera body, (B) Rear view of camera body Cross section of interchangeable lens unit (wide angle end) Cross section of interchangeable lens unit (wide angle end) Cross section of interchangeable lens unit (telephoto end) Cross section of interchangeable lens unit (telephoto end) Exploded perspective view of second lens group unit and focus lens unit Exploded perspective view of second lens group unit and focus lens unit Partial perspective view of focus lens unit (A) Configuration diagram of optical system (wide angle end), (B) Configuration diagram of optical system (telephoto end) A graph showing the relationship between the rotation angle of the zoom ring and the distance from the imaging sensor of each member The figure which shows the tracking table for realizing the zoom lens system Exploded perspective view of second support frame, aperture unit and third support frame Exploded perspective view of the second support frame, the aperture unit, and the third support frame from different directions A view of the second support frame and the aperture unit as seen from the image sensor side Perspective view of shake correction unit Exploded perspective view showing configuration of shake correction unit An exploded perspective view from another direction showing the configuration of the shake correction unit The figure which shows the shake correction unit after a 1st manufacturing process. The figure which shows the shake correction unit after a 2nd manufacturing process. The figure which shows the shake correction unit after a 3rd manufacturing process. The figure which shows the shake correction unit after a 4th manufacturing process. The figure which shows other embodiment of a position control member and an engaging part. Flow chart of manufacturing method of shake correction unit

Explanation of symbols

1 Digital camera (an example of an imaging device)
2 Interchangeable lens unit (an example of a lens barrel)
3 Camera body 3a Case 4 Body mount 10 Body microcomputer (an example of a drive control unit, an example of a preliminary motion detection unit)
11 Image sensor (an example of an image sensor)
12 Image sensor drive control unit 20 Display unit 21 Image display control unit 22 Battery (an example of a main power source)
50 fixed frame 51 cam cylinder 52 first holder 53 first lens group support frame 54 second lens group support frame (an example of a first lens support frame)
55 Second holder (an example of a first lens support frame)
57 First support frame (an example of a movable frame)
57L 1st nail | claw part (an example of a 1st engaging part and a 1st light-shielding part)
57S 2nd nail | claw part (an example of a 2nd engaging part and a 2nd light-shielding part)
57c groove (an example of a rotating shaft engaging portion)
58 second support frame (an example of a first diaphragm support frame, an example of a reference frame)
58A Positioning boss (example of positioning part)
58B Anti-rotation boss (example of positioning part)
59 Third support frame (an example of a second aperture support frame)
59C leaf spring (example of biasing part)
61 Fourth lens group support frame (an example of a second lens support frame)
62 Aperture unit (an example of an aperture device)
64 Focus motor (an example of focus actuator)
67 Photosensor (an example of a position sensor)
69 Shaft (example of rotating shaft)
74 Shake correction unit (an example of shake correction device)
75 Focus lens unit 77 Second lens group unit (an example of a first lens unit)
78 Fourth lens unit (an example of a second lens unit)
83 Zoom ring unit (example of zoom mechanism)
84 Zoom ring (example of zoom operation unit)
87 Linear position sensor 88 Focus ring unit 89 Focus ring 90 Focus ring angle detector 96L First pole (an example of a first position regulating member)
96S second pole (an example of a second position regulating member)
99 Lens removal button (an example of a lens removal operation unit, an example of a preliminary motion detection unit)
100 tracking table L optical system L7 seventh lens (an example of a shake correction lens group)
G1 First lens group G2 Second lens group G3 Third lens group G4 Fourth lens group L5 Fifth lens (an example of a first lens element)
L6 6th lens (an example of a focus lens)
L7 seventh lens (an example of a second lens element)

Claims (6)

A reference frame,
A movable frame that supports the shake correction lens group and is movable with respect to the reference frame in a plane orthogonal to the optical axis of the shake correction lens group;
A first driving unit that applies a driving force in a first direction perpendicular to the optical axis to the movable frame;
A second driving unit that applies a driving force in a second direction perpendicular to the optical axis to the movable frame;
A first pole fixed to the reference frame and having a shape extending in a direction perpendicular to the optical axis;
A second pole fixed to the reference frame and having a shape extending in a direction perpendicular to the optical axis;
A first engaging portion that is formed on the movable frame, engages with the first pole, and restricts movement of the movable frame relative to the reference frame in the optical axis direction;
A second engaging portion that is formed on the movable frame, engages with the second pole, and restricts movement of the movable frame relative to the reference frame in the optical axis direction;
A first light-shielding portion disposed on the subject side of the first pole and covering the first pole from the subject side;
A second light-shielding portion disposed on the subject side of the second pole and covering the second pole from the subject side;
A shake correction apparatus comprising: In all the positional relationships in which the movable frame can move with respect to the reference frame, the first light shielding portion covers the first pole from the subject side, and the second light shielding portion covers the second pole from the subject side. ,
The shake correction apparatus according to claim 1. The first light shielding part and the second light shielding part are formed on the movable frame,
The shake correction apparatus according to claim 1. The first light shielding portion is formed integrally with the first engagement portion,
The second light shielding portion is formed integrally with the second engaging portion.
The shake correction apparatus according to any one of claims 1 to 3. The shake correction device according to claim 1 is provided.
Lens barrel. The shake correction apparatus according to claim 1 is provided.
Imaging device.

Images