JP2019008228A - Optical unit with vibration correction function - Google Patents

Abstract

To maintain the center of gravity of a movable body of an optical unit having a gimbal mechanism in an appropriate position.SOLUTION: An optical unit 100 comprises a camera module 1, and the camera module 1 is oscillatably supported by a gimbal mechanism 500. The camera module 1 includes a zoom lens 2 configured by assembling a lens 7 as optical element into a lens-barrel 8 and a weight 3. When moving the zoom lens 2 in an optical axis L direction by the first drive mechanism 20, the camera module 1 moves, in interlock with the movement of the zoom lens 2, the weight 3 in the optical axis L direction by the second drive mechanism 30. The second drive mechanism 30 moves the weight 3 so as to maintain a state where a first axis line R1 and a second axis line R2 as oscillation axis of the camera module 1 is same as the center of gravity of the camera module 1 in terms of the position of the optical axis L direction.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an optical unit with a shake correction function for suppressing disturbance of a captured image.

  Some optical units mounted on a portable terminal or a moving body include a mechanism that corrects shake by swinging the optical module in order to suppress disturbance of a captured image when the portable terminal or the moving body moves. . This type of optical unit includes a swing mechanism that swings the optical module in the pitching direction and the yawing direction in response to tilting in two directions, pitching (pitch / tilting) and yawing (rolling / panning). .

  In such an optical unit, a configuration in which a gimbal mechanism is provided between the movable body and the fixed body has been proposed in order to support the optical module (movable body) so as to be swingable with respect to the fixed body. Patent Document 1 discloses this type of optical unit. In Patent Document 1, the gimbal mechanism is separated by a movable frame provided between the movable body and the fixed body, and a first axial direction intersecting the optical axis direction between the movable frame and the fixed body. A swing support portion provided at a location, and a swing support portion provided at two locations spaced apart in the second axis direction intersecting the optical axis direction and the first axis direction between the movable frame and the movable body. And.

  When the movable body is swingably supported by the gimbal mechanism, the position of the center of gravity of the movable body in the optical axis direction matches the position of the swing axis of the gimbal mechanism (the swing center of the movable body) in the optical axis direction. It is desirable. Therefore, a weight is added to the movable body, the center of gravity of the movable body is moved in the optical axis direction, and the position of the center of gravity of the movable body in the optical axis direction is matched with the swing axis. In Patent Document 1, a weight is fixed to an end of the optical module on the subject side.

JP2015-64501A

  When a zoom mechanism is added to the optical unit to use the zoom function, the lens unit (optical element) is moved in the optical axis direction by the zoom mechanism, so that the center of gravity of the movable body moves according to the amount of movement of the lens unit. . Therefore, even if the center of gravity of the movable body is adjusted to an appropriate position by the weight, the center of gravity of the movable body is shifted when the zoom function is used, and the center of gravity of the movable body cannot be maintained at an appropriate position.

  In view of the above problems, an object of the present invention is to maintain the center of gravity of a movable body at an appropriate position when an optical element is moved in the optical axis direction in an optical unit including a gimbal mechanism.

In order to solve the above-described problem, an optical unit with a shake correction function according to the present invention includes a movable body including an optical element and a weight, a fixed body, and the light of the optical element with respect to the fixed body. A gimbal that supports the movable body so as to be swingable about a first axis that intersects the axis and swings about the second axis that intersects the optical axis and the first axis with respect to the fixed body. A mechanism, a swinging drive mechanism that swings the movable body around the first axis and the second axis, a first drive mechanism that moves the optical element in the optical axis direction, and the optical element. And a second drive mechanism for moving the weight in the optical axis direction in conjunction with movement in the optical axis direction.

  In the present invention, the movable body is swingably supported by the gimbal mechanism. The movable body includes an optical element and a weight. When the optical element is moved in the optical axis direction, the weight can be moved in the optical axis direction in conjunction with the movement of the optical element. Therefore, when the optical unit is provided with a function for moving the optical element (for example, a zoom function or an autofocus function), the weight can be moved in conjunction with the optical element, and the center of gravity moves along with the movement of the optical element. The weight can be moved in response to. Therefore, when using the function of moving the optical element, the center of gravity of the movable body can be maintained at an appropriate position. For example, the center of gravity of the movable body can be kept at an appropriate position when the zoom function or the autofocus function is used.

  In the present invention, it is preferable that the second drive mechanism moves the weight to a position that cancels the gravity center movement of the movable body based on the movement of the optical element in the optical axis direction. In this way, the center of gravity of the movable body can be kept at a fixed position when the optical element is moved.

  In the present invention, it is preferable that the first axis and the second axis and the center of gravity of the movable body have the same position in the optical axis direction. Thus, if the position of the swing axis of the movable body in the optical axis direction (that is, the support position of the movable body by the gimbal mechanism) matches the center of gravity of the movable body, disturbance vibration, impact, or centrifugal force It is possible to suppress the tilt and vibration of the movable body when added. Therefore, the impact resistance is high. In addition, there is little possibility that shake correction cannot be performed due to vibration.

  In the present invention, it is preferable that the second drive mechanism moves the weight linearly in parallel with the optical axis. Thus, if the weight does not move in the radial direction, the radial size of the second drive mechanism can be reduced.

  In the present invention, the movable body includes a cylindrical portion that holds the optical element so as to be movable in the optical axis direction, and the weight is within the range of the length of the cylindrical portion in the optical axis direction. It is preferably movable in the direction. If it does in this way, the gravity center of a movable body can be moved within the range of the optical axis direction of a cylinder part with a weight. Further, since the weight can be moved in the optical axis direction along the outer peripheral surface of the cylindrical portion, the movable body can be made compact by disposing the second drive mechanism in the space near the outer peripheral side of the cylindrical portion. be able to.

  In the present invention, it is preferable that the weight is supported so as to be movable in the optical axis direction at a position having a gap between the weight and the outer peripheral surface of the cylindrical portion. If it does in this way, a weight can be moved, without contacting a cylinder part. Therefore, adverse effects on the optical element due to contact with the weight can be prevented.

  In the present invention, it is preferable that the weight has an annular shape and is disposed coaxially with the cylindrical portion. In this way, the influence of the weight is the same regardless of the swinging direction of the movable body. Therefore, it is easy to control the swing drive mechanism for performing shake correction.

  In the present invention, the weight is preferably nonmagnetic. In this case, when the optical unit includes a magnet, a magnetic attractive force does not work between the magnet and the weight. Therefore, when the magnetic drive mechanism is used as the drive mechanism, the weight does not affect the magnetic drive mechanism.

In the present invention, the movable body is swingably supported by the gimbal mechanism. The movable body includes an optical element and a weight. When the optical element is moved in the optical axis direction, the weight can be moved in the optical axis direction in conjunction with the movement of the optical element. Therefore, when the optical unit has a function of moving the optical element (for example, a zoom function or an autofocus function), the weight can be moved in accordance with the movement of the center of gravity accompanying the movement of the optical element. Therefore, when using the function of moving the optical element, the center of gravity of the movable body can be maintained at an appropriate position. For example, the center of gravity of the movable body can be kept at an appropriate position when the zoom function or the autofocus function is used.

It is a perspective view of an optical unit with a shake correction function to which the present invention is applied. It is the perspective view which looked at the camera module from the to-be-photographed object side. It is the perspective view which looked at the camera module from the non-subject side. It is sectional drawing of a camera module. It is explanatory drawing of the gravity center movement of the camera module by the movement of a zoom lens. It is explanatory drawing of position adjustment of a weight. It is a disassembled perspective view of the optical unit with a shake correction function of FIG.

  Embodiments of an optical unit with a shake correction function to which the present invention is applied will be described below with reference to the drawings. In this specification, the symbol L is the optical axis of the optical unit with shake correction function, the L1 direction is the subject side in the optical axis L direction, and the L2 direction is the opposite subject side in the optical axis L direction. The three directions of XYZ are orthogonal to each other, one side of the X direction is indicated by + X, the other side is indicated by -X, one side of the Y direction is indicated by + Y, the other side is indicated by -Y, and one side of the Z direction is indicated. The side is indicated by + Z and the other side is indicated by -Z. The Z direction coincides with the optical axis L direction of the optical unit with shake correction function. Further, the subject side L1 coincides with the + Z direction, and the non-subject side L2 coincides with the −Z direction.

(overall structure)
FIG. 1 is a perspective view of an optical unit 100 with a shake correction function to which the present invention is applied as viewed from the subject side L1. The optical unit 100 with a shake correction function (hereinafter referred to as the optical unit 100) includes a shake correction mechanism that corrects a shake around an axis orthogonal to the optical axis L of the camera module 1 having a zoom function and an autofocus function. It is built into the unit and configured to perform shake correction in the pitching (pitch) direction and yawing (rolling) direction.

  The optical unit 100 includes a camera module 1 that is a movable body, a holder 300 that holds the camera module 1, a fixed body 400 that is fixed to an optical device main body on which the optical unit 100 is mounted, A gimbal mechanism 500 for swingably supporting the module 1 and the holder 300, a swinging magnetic drive mechanism 600 for swinging the camera module 1 with respect to the fixed body 400, and a spring for returning the camera module 1 to the reference posture A member 700 is provided. The support structure of the camera module 1 by the gimbal mechanism 500 and the spring member 700 and the shake correction of the optical unit 100 by the swinging magnetic drive mechanism 600 will be described later.

(Movable body)
FIG. 2 is a perspective view of the camera module 1 viewed from the subject side L1, and FIG. 3 is a perspective view of the camera module 1 viewed from the opposite subject side L2. As shown in FIGS. 2 and 3, the camera module 1 that is a movable body includes a zoom lens 2, a lens holder 10 that holds the zoom lens 2, and a first drive mechanism that moves the zoom lens 2 in the optical axis L direction. 20. The camera module 1 also includes an annular weight 3 and a second drive mechanism 30 that moves the weight 3 in the direction of the optical axis L.

  FIG. 4 is a cross-sectional view of the camera module 1. The lens holder 10 includes a holder tube portion 11 that is a cylindrical tube portion, a step portion 12 that extends radially outward from an end on the anti-subject side L2 of the holder tube portion 11, and an anti-subject from the outer periphery of the step portion 12. A square tube portion 13 extending in a cylindrical shape is provided on the side L2. The zoom lens 2 is held on the inner peripheral side of the holder tube portion 11. In this state, the optical axis L of the zoom lens 2 coincides with the central axis of the holder tube portion 11 of the lens holder 10. As shown in FIG. 4, the camera module 1 includes a lens unit 4 disposed on the anti-subject side L <b> 2 of the zoom lens 2 and an image sensor 5 disposed on the anti-subject side L <b> 2 of the lens unit 4. The substrate 6 on which the image sensor 5 is mounted is fixed to the end of the rectangular tube portion 13 on the side opposite to the subject L2.

  The zoom lens 2 is configured by assembling a lens 7 as an optical element to a lens barrel 8. An end of the zoom lens 2 on the subject side L1 protrudes from the holder tube portion 11 toward the subject side L1. At the end of the zoom lens 2 on the subject side L1, a nut part 81 and a guide convex part 82 projecting radially outward from the outer peripheral surface of the lens barrel 8 are formed. The nut portion 81 is screwed into the lead screw 22 formed on the first drive shaft 21 of the first drive mechanism 20. The guide convex portion 82 is formed at a position spaced apart from the nut portion 81 in the circumferential direction, and the guide convex portion 82 is provided with a guide shaft 9 extending parallel to the optical axis L on the outer peripheral side of the holder tube portion 11. A guide groove 83 that is slidably held is formed.

  The lens holder 10 is formed with a guide shaft support portion 14 that protrudes radially outward from the center of the side surface of the rectangular tube portion 13 and a guide shaft support portion 15 that protrudes radially outward from the outer peripheral surface of the holder tube portion 11. ing. The guide shaft support portions 14 and 15 are formed at the same angular position. The guide shaft 9 is supported by support holes formed in the guide shaft support portions 14 and 15, and extends in parallel with the optical axis L. An end of the guide shaft 9 on the subject side L1 protrudes from the guide shaft support portion 15 toward the subject side L1, and is slidably held in the guide groove 83 of the guide convex portion 82 described above.

  The first drive mechanism 20 includes a first drive shaft 21 extending parallel to the optical axis L, a motor 23 that rotates the first drive shaft 21 around its central axis L21, and the first drive shaft 21 around the central axis L21. A frame 24 that is rotatably held and a nut portion 81 formed on the lens barrel 8 of the zoom lens 2 that is a driven member are provided. Based on the rotation of the first drive shaft 21 around the central axis L <b> 21, the nut portion 81 screwed into the lead screw 22 formed on the first drive shaft 21 moves in parallel with the optical axis L. Thereby, the zoom lens 2 moves in the direction of the optical axis L.

  The second drive mechanism 30 includes a second drive shaft 31 extending in parallel with the optical axis L, a motor 33 that rotates the second drive shaft 31 around the central axis L31, and the second drive shaft 31 around the central axis L31. A frame 34 that is rotatably held and a nut portion 35 formed on a weight 3 that is a driven member are provided. The weight 3 is formed with a nut portion 35 and a guide convex portion 36 that protrude radially outward from the outer peripheral surface. A guide groove 37 that slidably holds the guide shaft 9 is formed in the guide convex portion 36. The nut portion 35 is screwed into the lead screw 32 formed on the second drive shaft 31. Accordingly, the weight 3 on which the nut portion 35 is formed moves in the optical axis L direction based on the rotation of the second drive shaft 31 around the central axis L31.

  The second drive mechanism 30 moves the weight 3 linearly in parallel with the optical axis L. Further, the moving range of the weight 3 toward the subject side L1 is restricted by the guide shaft support portion 15 provided at the end portion of the holder cylinder portion 11 on the subject side L1. Further, the range of movement of the weight 3 toward the non-subject side L2 is restricted by the step portion 12 connected to the end of the holder tube portion 11 on the non-subject side L2. In other words, the weight 3 is movable in the optical axis L direction within the range of the length of the holder cylinder portion 11 in the optical axis L direction.

The frame 24 of the first drive mechanism 20 is bent in the same direction perpendicular to the frame main body 241 from the frame main body 241 extending in parallel with the optical axis L, and the subject side L1 and the opposite subject side L2 of the frame main body 241. Flanges 242, 243. The first drive shaft 21 is rotatably supported by flanges 242, 243. In addition, the motor 23 that rotates the first drive shaft 21 is disposed on the opposite object side L <b> 2 of the flange 242 and is supported by the flange 242.

  The frame 34 of the second drive mechanism 30 is formed in the same manner as the frame 24 of the first drive mechanism 20. That is, the frame 34 of the second drive mechanism 30 is in the same direction perpendicular to the frame body 341 from the frame main body 341 extending in parallel with the optical axis L and the subject side L1 and the opposite subject side L2 of the frame main body 341. Are provided with flanges 342 and 343 bent. The second drive shaft 31 is rotatably supported by the flanges 342 and 343, and the motor 33 that rotates the second drive shaft 31 is disposed on the opposite object side L <b> 2 of the flange 342 and is supported by the flange 342. .

  The weight 3 is made of a nonmagnetic metal. For example, it consists of metals, such as tungsten, brass, and stainless steel. The inner peripheral surface of the weight 3 has a larger diameter than the outer peripheral surface of the holder tube portion 11. The weight 3 is disposed coaxially with the holder tube portion 11, and a gap is formed between the inner peripheral surface of the weight 3 and the outer periphery surface of the holder tube portion 11. The weight 3 is held at a position having a gap with the lens holder 10 and is supported so as to move without contacting the lens holder 10 when moving in the direction of the optical axis L.

(Center of gravity adjustment by weight)
The optical unit 100 drives the motor 23 of the first drive mechanism 20 to move the zoom lens 2 in the optical axis L direction when using the zoom function or autofocus function of the camera module 1. As a result, the zoom lens 2 moves relative to the lens unit 4 and the image sensor 5 in the optical axis L direction. The second drive mechanism 30 moves the weight 3 in the optical axis L direction in conjunction with the movement of the zoom lens 2 in the optical axis L direction. In the present embodiment, the second drive mechanism 30 moves the weight 3 to a position that cancels the gravity center movement of the camera module 1 based on the movement of the zoom lens 2 in the optical axis L direction. Therefore, the second drive mechanism 30 moves the weight 3 in the direction opposite to the moving direction of the zoom lens 2.

  In the first drive mechanism 20 and the second drive mechanism 30, the motors 23 and 33 are controlled so that the first drive shaft 21 and the second drive shaft 31 are rotated in the corresponding rotation direction in conjunction with each other. For example, when the first drive shaft 21 and the second drive shaft 31 rotate in the same direction and the zoom lens 2 and the weight 3 move in the same direction, when the first drive shaft 21 rotates, the second drive The shaft 31 is simultaneously rotated in the direction of rotation opposite to that of the first drive shaft 21. The speed ratio of the rotation speeds of the first drive shaft 21 and the second drive shaft 31 is a speed ratio corresponding to the weight ratio of the zoom lens 2 and the weight 3. Thereby, the center of gravity movement of the camera module 1 due to the movement of the zoom lens 2 is offset by the center of gravity movement of the camera module 1 due to the movement of the weight 3. Therefore, the center of gravity of the camera module 1 can be kept at a fixed position.

  In FIG. 4, the zoom lens 2 is positioned at the first position 2A where the zoom lens 2 is most retracted to the opposite subject side L2. The gravity center position (first gravity center position) of the camera module 1 in this state is denoted by reference numeral G1. In this embodiment, the center of gravity of the camera module 1 is located within the range of the length of the holder tube 11 of the lens holder 10 in the optical axis L direction. FIG. 5 is an explanatory diagram of the movement of the center of gravity of the camera module 1 by the movement of the zoom lens 2. As shown in FIG. 5, when the zoom lens 2 is moved to the subject side L1 by the first drive mechanism 20, the center of gravity of the camera module 1 moves to the subject side L1. In FIG. 5, the zoom lens 2 is located at the second position 2B moved from the first position 2A to the subject side L1 by the dimension D, and the center of gravity position (second center of gravity position) of the camera module 1 at the second position 2B. ) Is indicated by the symbol G2.

  FIG. 6 is an explanatory diagram of the position adjustment of the weight 3. As shown in FIG. 5, when the zoom lens 2 moves to the subject side L1 by the dimension D and the weight 3 does not move, the center of gravity of the camera module 1 moves from the first center of gravity position G1 to the second center of gravity position G2. . Therefore, in this embodiment, as shown in FIG. 6, in order to keep the center of gravity of the camera module 1 at the first center of gravity position G1, the weight 3 is moved away from the object by the second drive mechanism 30 simultaneously with the movement of the zoom lens 2. Move to side L2. As shown in FIG. 4, when the zoom lens 2 is located at the first position 2A, the weight 3 is located at the first position 3A that is most advanced to the subject side L1. As shown in FIG. 6, the position of the weight 3 for keeping the camera module 1 in the second position 2B is the second position 3B shown in FIG. The second position 3B is a position retracted by the dimension E from the first position 3A to the non-subject side L2. For example, the dimension E can be a value obtained by multiplying the moving amount (dimension D) of the zoom lens 2 by the ratio of the weight of the weight 3 to the weight of the zoom lens 2. As a result, the center of gravity of the camera module 1 can be prevented from moving from the first center of gravity position G1.

(Camera module support structure)
As shown in FIG. 1, in the optical unit 100, the camera module 1 and the holder 300 are supported by a gimbal mechanism 500 so as to be swingable about a first axis R1 orthogonal to the optical axis L direction, and the optical axis. It is supported so as to be swingable around the second axis R2 perpendicular to the L direction and the first axis R1. The first axis R1 and the second axis R2 are diagonal directions of the fixed body 400, and are inclined 45 degrees with respect to the X direction and the Y direction.

  FIG. 7 is an exploded perspective view of the optical unit 100 with a shake correction function (optical unit 100) of FIG. As shown in FIG. 7, the fixed body 400 is assembled from the −Z direction side to the first case 410 having a substantially square outer shape when viewed from the optical axis L direction (Z direction). The second case 420 is provided. The first case 410 is fixed to the second case 420 by welding or the like. The first case 410 includes a rectangular tube-shaped body portion 411 surrounding the holder 300 and a rectangular frame-shaped end plate portion 412 projecting inward from the end portion of the body portion 411 in the + Z direction. A window 413 is formed at the center of the end plate portion 412. The body portion 411 includes a pair of side plates 401 and 402 facing in the X direction and a pair of side plates 403 and 404 facing in the Y direction. The second case 420 includes two members, a first member 421 having a rectangular frame shape and a second member 422 having a rectangular frame shape attached to the −Z direction side of the first member 421.

  The holder 300 includes a holder main body 310 to which the camera module 1 is fixed, a pair of wall portions 301 and 302 extending in the Y direction on both sides in the X direction of the camera module 1 fixed to the holder main body 310, and a camera The module 1 includes a pair of walls 303 and 304 extending in the X direction on both sides in the Y direction. In the camera module 1, the holder cylinder portion 11 of the lens holder 10 is disposed on the inner peripheral side of the wall portions 301 to 304. 1 and FIG. 7, the first drive mechanism 20 and the second drive mechanism 30 are not shown. However, the camera module 1 includes the first drive mechanism 20 and the second drive mechanism 30 in the holder 300 and the gimbal. The holder 300 is assembled so as not to interfere with the mechanism 500. The holder main body 310 is substantially rectangular when viewed from the optical axis L direction, and the walls 301 to 304 are provided on the outer peripheral edge of the holder main body 310. In addition, a stopper 312 that restricts the swing range of the holder 300 by contacting the second case 420 of the fixed body 400 is provided at the end in the −Z direction of the holder main body 310.

The gimbal mechanism 500 is configured between the holder 300 and the fixed body 400. The gimbal mechanism 500 includes a first swing support portion 501 provided at a diagonal position on the first axis R1 of the holder body 310 and a first position provided at a diagonal position on the second axis R2 of the fixed body 400. And a movable frame 503 supported by the first swing support portion 501 and the second swing support portion 502. The first axis R1 and the second axis R2 are orthogonal to the optical axis L direction and inclined by 45 degrees with respect to the X direction and the Y direction, and the first axis R1 and the second axis R2 are orthogonal to each other. The second swing support portion 502 is formed on the first member 421 constituting the second case 420 of the fixed body 400. The movable frame 503 includes fulcrum portions 504 provided at four locations around the optical axis, and connecting portions 505 that connect the adjacent fulcrum portions 504 around the optical axis, and has a spring property.

  Metal spheres (not shown) are fixed to the inner surface of each fulcrum 504 in the movable frame 503 by welding or the like. This spherical body makes point contact with the first swing support portion 501 provided in the holder 300 and the contact spring 511 held by the second swing support portion 502 provided in the fixed body 400. The contact spring 511 is a plate spring, and the contact spring 511 held by the first swing support portion 501 is elastically deformable in the direction of the first axis R1 and is held by the second swing support portion 502. 511 is elastically deformable in the direction of the second axis R2. Accordingly, the movable frame 503 is supported in a state of being rotatable around each direction in two directions (the first axis R1 direction and the second axis R2 direction) orthogonal to the optical axis L direction.

  The swinging magnetic drive mechanism 600 includes four sets of magnetic drive mechanisms 601 provided between the holder 300 and the fixed body 400. Each magnetic drive mechanism 601 includes a magnet 602 and a coil 603. The coil 603 is held on the outer side surfaces of the wall portions 301 and 302 on both sides in the X direction of the holder 300 and the wall portions 303 and 304 on both sides in the Y direction of the holder 300. The magnet 602 is held on the inner surface of the side plates 401, 402, 403, 404 provided on the first case 410 of the fixed body 400. The first case 410 is made of a magnetic material and functions as a yoke for the magnet 602.

  Between the holder 300 and the fixed body 400, a magnetic drive mechanism 601 is formed in which the magnet 602 and the coil 603 face each other on the + X direction side, the −X direction side, the + Y direction side, and the −Y direction side. . The magnet 602 is divided into two in the optical axis L direction (that is, the Z direction), and the magnetic poles on the inner surface side are magnetized so as to be different from each other at the division position (magnetization polarization line). The coil 603 is an air-core coil, and the long side portions on the + Z direction side and the −Z direction side are used as effective sides.

  The two sets of magnetic drive mechanisms 601 located on the + Y direction side and the −Y direction side of the holder 300 are connected so that a magnetic drive force in the same direction around the X axis is generated when the coil 603 is energized. Further, the two sets of magnetic drive mechanisms 601 located on the + X direction side and the −X direction side of the holder 300 are connected so that a magnetic drive force in the same direction around the Y axis is generated when the coil 603 is energized. Yes. The magnetic drive mechanism 601 is rotated around the X axis by two sets of magnetic drive mechanisms 601 located on the + Y direction side and the −Y direction side, and two sets of magnetic drive mechanisms 601 located on the + X direction side and the −X direction side. The camera module 1 is rotated about the first axis R1 and the second axis R2 by synthesizing the rotation about the Y axis. When shake correction around the X axis and shake correction around the Y axis are performed, the rotation around the first axis R1 and the rotation around the second axis R2 are combined.

The spring member 700 is disposed at the end of the holder main body 310 in the −Z direction, and connects the holder 300 and the fixed body 400. The posture (reference posture) of the holder 300 and the camera module 1 when the oscillating magnetic drive mechanism 600 is not driven is determined by the spring member 700. The spring member 700 is a rectangular frame-shaped plate spring obtained by processing a metal plate. The spring member 700 is fixed to the inner peripheral side of the second case 420 of the fixed body 400 with a fixed body side connecting portion 701 provided on the outer peripheral portion thereof. Further, the movable body side connecting portion 702 provided on the inner peripheral portion of the spring member 700 is fixed to the fixing convex portion 313 provided on the outer peripheral surface of the holder main body portion 310, and the fixed body side connecting portion 701 and the movable body side connecting portion 702 are fixed. Are connected by an arm portion 703. Instead of using the spring member 700, the magnetic member is fixed at a position facing the magnet 602 used in the magnetic drive mechanism 601 to form a magnetic spring, and the holder 300 and the camera module 1 are configured using the magnetic spring. Can be returned to the standard posture.

  As described above, the optical unit 100 includes the swinging magnetic drive mechanism 600 that is a shake correction unit that performs shake correction around the X axis and shake correction around the Y axis, and the camera module 1 includes the swinging magnetic drive mechanism 600. When the camera mechanism 1 is in the reference state in which the shake correction around the X axis and the Y axis by the drive mechanism 600 is not performed, the optical axis L direction of the camera module 1 is in an attitude that coincides with the Z direction in FIGS. It is incorporated in the optical unit 100.

  Therefore, the optical unit 100 can perform shake correction in the pitching (pitch) direction and the yawing (rolling) direction. The optical unit 100 includes a shake detection sensor such as a gyroscope. The shake detection sensor detects shakes in the pitching direction and the yawing direction, and drives the swinging magnetic drive mechanism 600 so as to cancel the detected shake. Note that a rolling magnetic drive mechanism can be mounted on the optical unit 100 to perform rolling correction.

(Main effects of this embodiment)
As described above, the optical unit 100 of the present embodiment includes the camera module 1, and the camera module 1 is rotated around the first axis R 1 intersecting the optical axis L by the gimbal mechanism 500 via the holder 300, and The optical axis L and the second axis R2 intersecting the first axis R1 are supported so as to be swingable. Then, the swinging magnetic drive mechanism 600 swings the holder 300 and the camera module 1 to perform shake correction. The camera module 1 includes a zoom lens 2 that is an optical element configured by assembling the lens 7 to the lens barrel 8 and a weight 3. When the zoom lens 2 is moved in the direction of the optical axis L by the first drive mechanism 20, In conjunction with the movement of the zoom lens 2, the weight 3 is moved in the optical axis L direction by the second drive mechanism 30. Thus, when the zoom lens 2 is moved in the optical axis L direction, the weight 3 is interlocked and moved in the optical axis L direction to use the function of moving the zoom lens 2 in the optical axis L direction. 3, the center of gravity of the camera module 1 can be adjusted. Therefore, the center of gravity of the camera module 1 can be kept at an appropriate position.

  The optical unit 100 of this embodiment can keep the center of gravity of the camera module 1 at an appropriate position when using the zoom function or the autofocus function. For example, the second drive mechanism 30 moves the weight 3 to a position that cancels the gravity center movement of the camera module 1 based on the movement of the zoom lens 2 in the optical axis L direction. Thereby, the center of gravity of the camera module 1 can be kept at a fixed position.

  In the optical unit 100 of the present embodiment, the camera module 1 is moved around the first axis R1 that intersects the optical axis L, and intersects the optical axis L and the first axis R1 by the gimbal mechanism 500 via the holder 300. It is supported so as to be able to swing around the biaxial line R2. Then, the swinging magnetic drive mechanism 600 swings the holder 300 and the camera module 1 to perform shake correction. In such a support structure, it is preferable that the first axis R1 and the second axis R2 that are the swing axes of the camera module 1 and the center of gravity of the camera module 1 are located at the same position in the optical axis L direction. In this embodiment, since the center of gravity of the camera module 1 can be maintained at a fixed position, the center of gravity of the camera module 1 and the first axis R1 and the second axis R2 are used in the optical axis L direction by using this function. The position of the weight 3 in the optical axis L direction is adjusted so as to maintain the same position. Thus, by maintaining the state where the swing axis of the camera module 1 and the center of gravity of the camera module 1 coincide with each other, the tilt and vibration of the camera module 1 when disturbance vibration, impact, or centrifugal force is applied. Can be suppressed. Therefore, the impact resistance is high. In addition, there is little possibility that shake correction cannot be performed due to vibration.

Since the second drive mechanism 30 of this embodiment is configured to move the weight 3 linearly in parallel with the optical axis L, a structure and a space for moving the weight 3 in the radial direction are unnecessary. Therefore, since the radial size of the second drive mechanism 30 is small, the radial size of the camera module 1 can be reduced, which is advantageous for downsizing the optical unit 100.

  The camera module 1 according to the present embodiment includes a lens holder 10, the lens holder 10 includes a holder tube portion 11 that holds the zoom lens 2 so as to be movable in the direction of the optical axis L, and the weight 3 is light of the holder tube portion 11. It can move in the direction of the optical axis L within the range of the length in the direction of the axis L. Accordingly, since the second drive mechanism 30 can be arranged in the space on the outer peripheral side of the holder tube portion 11, the camera module 1 can be made compact. Further, by moving the weight 3 in such a moving range, the center of gravity of the camera module 1 can be set within the range of the holder tube portion 11 in the optical axis L direction.

  The weight 3 of this embodiment is supported so as to be movable in the optical axis L direction at a position having a gap with the outer peripheral surface of the holder cylinder portion 11. Accordingly, the weight 3 can be moved without being in contact with the holder cylinder portion 11, and adverse effects on the zoom lens 2 due to contact with the weight 3 can be prevented. Further, the weight 3 has an annular shape and is disposed coaxially with the holder tube portion 11. Therefore, since the influence of the weight 3 is the same regardless of the swing direction of the camera module 1, it is easy to control the swing magnetic drive mechanism 600 for performing shake correction. Furthermore, since the weight 3 is non-magnetic, no magnetic attractive force acts between the magnet 602 of the swinging magnetic drive mechanism 600 and the weight 3. Therefore, the weight 3 does not affect the oscillating magnetic drive mechanism 600.

  The camera module 1 of this embodiment includes a guide shaft 9 extending in parallel with the optical axis L, and the zoom lens 2 has a guide groove 83 that slidably holds the guide shaft 9 at an angular position different from that of the first drive shaft 21. I have. The weight 3 includes a guide groove 37 that slidably holds the guide shaft 9 at an angular position different from that of the second drive shaft 31. Thus, by providing the guide shaft 9, the tilt of the zoom lens 2 and the weight 3 can be suppressed and can be moved stably. Further, since the zoom lens 2 and the weight 3 are supported by the common guide shaft 9, the number of parts can be reduced, which is advantageous for cost reduction and size reduction.

(Modification)
(1) The first drive mechanism 20 having the above configuration includes the first drive shaft 21 extending in parallel with the optical axis L, and the zoom lens 2 moves in the optical axis L direction based on the rotation of the first drive shaft 21. . The second drive mechanism 30 includes a second drive shaft 31 extending in parallel with the optical axis L, and the weight 3 moves in the optical axis L direction based on the rotation of the second drive shaft 31. When such a driving mechanism is used, the weight 3 and the camera module 1 are moved by the driving force of a common motor instead of rotating the first driving shaft 21 and the first driving mechanism 20 by separate motors. be able to. For example, the first drive shaft 21 and the second drive shaft 31 can be rotated in conjunction with each other using a gear unit.

(2) As the 1st drive mechanism 20 and the 2nd drive mechanism 30, you may use mechanisms other than a motor and a lead screw and a nut. For example, a piezo actuator can be used.

(3) In the above embodiment, the annular weight 3 is used, but the weight 3 may be a polygon. Alternatively, a plurality of weights divided in the circumferential direction may be arranged in an annular shape, and these may be linked and moved in the direction of the optical axis L.

DESCRIPTION OF SYMBOLS 1 ... Camera module, 2 ... Zoom lens, 2A ... 1st position, 2B ... 2nd position, 3 ... Weight, 3A ... 1st position, 3B ... 2nd position, 4 ... Lens unit, 5 ... Image sensor, 6 ... Substrate, 7 ... lens, 8 ... lens barrel, 9 ... guide shaft, 10 ... lens holder, 11 ... holder tube portion, 12 ... stepped portion, 13 ... square tube portion, 14, 15 ... guide shaft support portion, 20 ... first DESCRIPTION OF SYMBOLS 1 drive mechanism, 21 ... 1st drive shaft, 22 ... Lead screw, 23 ... Motor, 24 ... Frame, 30 ... 2nd drive mechanism, 31 ... 2nd drive shaft, 32 ... Lead screw, 33 ... Motor, 34 ... Frame , 35 ... nut part, 36 ... guide convex part, 37 ... guide groove, 81 ... nut part, 82 ... guide convex part, 83 ... guide groove, 100 ... optical unit with shake correcting function, 241 ... frame main body, 242 and 243 ... Flange, 00 ... Holder, 301, 302, 303, 304 ... Wall part, 310 ... Holder main body part, 312 ... Stopper, 313 ... Fixing convex part, 341 ... Frame main body, 342, 343 ... Flange, 400 ... Fixed body, 401, 402, 403, 404 ... side plate, 410 ... first case, 411 ... trunk, 412 ... end plate, 413 ... window, 420 ... second case, 421 ... first member, 422 ... second member, 500 ... gimbal 501... First swing support portion 502. Second swing support portion 503. Movable frame 504. Support point portion 505. Connection portion 600... Magnetic drive mechanism for swing 601. 602: Magnet, 603: Coil, 700: Spring member, 701: Fixed body side connecting portion, 702 ... Movable body side connecting portion, 703 ... Arm portion, L: Optical axis, L1: Subject side, L2: Anti-subject side, L 1 ... central axis, L31 ... center axis, R1 ... first axis, R2 ... second axis, G1 ... first centroid position, G2 ... second centroid position

Claims (8)

A movable body including an optical element and a weight, and a fixed body;
The movable body is supported with respect to the fixed body so as to be swingable around a first axis intersecting the optical axis of the optical element, and the movable body is supported with respect to the fixed body by the optical axis and the first axis. A gimbal mechanism swingably supported around a second axis intersecting with
A rocking drive mechanism that rocks the movable body around the first axis and the second axis;
A first drive mechanism for moving the optical element in the optical axis direction;
And a second drive mechanism that moves the weight in the optical axis direction in conjunction with the movement of the optical element in the optical axis direction.   2. The shake correction function according to claim 1, wherein the second drive mechanism moves the weight to a position that cancels the gravity center movement of the movable body based on the movement of the optical element in the optical axis direction. Optical unit.   3. The optical unit with a shake correction function according to claim 1, wherein the first axis, the second axis, and the center of gravity of the movable body have the same position in the optical axis direction.   4. The optical unit with a shake correction function according to claim 1, wherein the second drive mechanism linearly moves the weight in parallel with the optical axis. 5. The movable body includes a cylindrical portion that holds the optical element movably in the optical axis direction,
5. The shake correction function according to claim 1, wherein the weight is movable in the optical axis direction within a range of a length of the cylindrical portion in the optical axis direction. Optical unit.   6. The optical unit with a shake correction function according to claim 5, wherein the weight is supported so as to be movable in the optical axis direction at a position having a gap between the weight and the outer peripheral surface of the cylindrical portion.   The optical unit with a shake correction function according to claim 5, wherein the weight has an annular shape and is disposed coaxially with the cylindrical portion.   The optical unit with a shake correction function according to claim 1, wherein the weight is nonmagnetic.

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