JP7250458B2 - Optical unit with anti-shake function - Google Patents

Description

The present invention relates to an optical unit with a shake correction function that corrects shake of an optical element (lens) mounted in a camera-equipped mobile terminal or the like.

In optical units used in optical devices such as imaging devices mounted on portable terminals, drive recorders, unmanned helicopters, etc., the optical element is oscillated so as to cancel out the shake in order to suppress the disturbance of the captured image due to the shake. A function for correcting shake has been developed. This shake correction function employs a configuration in which an optical element is movably supported by a fixed body that is the housing of the optical device, and the optical element is moved according to shake by a shake correction drive mechanism. there is

For example, in Patent Document 1, a holding body that holds a lens (optical element) is connected to a fixed body by a plurality of wires along the optical axis direction, so that it is supported so as to be movable in a direction substantially perpendicular to the optical axis direction. a drive mechanism for driving the holder in a first direction substantially perpendicular to the optical axis direction; A drive mechanism is provided for driving in the direction. These drive mechanisms employ a configuration in which a magnet and a coil are provided, and an electromagnetic force is applied to the holding member to drive the holding member by applying a current to the coil in the magnetic field of the magnet.
On the other hand, in Patent Document 2, the optical element is swingably supported within a support by a gimbal mechanism having fulcrums provided in two directions orthogonal to the optical axis direction of the optical element, and the support is driven for rolling. The optical module is rotatably supported around the optical axis by a mechanism, and is capable of correcting rolling as well as pitching (vertical shaking) and yawing (horizontal shaking) of the optical module.

By the way, in this type of optical equipment, an imaging device that converts an image from the optical element into an electric signal is arranged on the optical axis with respect to the optical element. Since this imaging device is an electronic component, it generates heat when operated. In recent years, since the number of pixels has increased, the heat generation of the imaging device has become a particular problem.

As a structure for dissipating heat generated by an image sensor, for example, in Patent Document 3, in a lens interchangeable digital camera, a heat transfer plate is provided so as to come into contact with the back surface of the image sensor and the substrate of the lens unit. is covered by a heat transfer plate cover, and when the lens unit is attached to the camera body, the heat transfer plate cover moves in the direction of the optical axis in conjunction with the mounting operation, and along with this, the convex portion formed on the heat transfer plate , By protruding from the through hole of the heat transfer plate cover, the heat transfer plate and the heat sink come into contact with each other through the convex portion, and the heat generated from the image sensor is transferred to the camera body and dissipated. .

Japanese Unexamined Patent Application Publication No. 2011-113009 JP 2015-82072 A JP 2011-65140 A

However, in the optical unit with a shake correction function, since the imaging element is provided inside the movable body, it is difficult to transfer heat to the outside.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to transmit the heat of an imaging device arranged in a movable body to the outside and radiate the heat.

An optical unit with a shake correction function of the present invention comprises an optical element and an imaging element positioned on the optical axis of the optical element, a movable body supporting the optical element and the imaging element, a fixed body, and a rolling support mechanism that supports the movable body so as to be rotatable about the optical axis; and a rolling correction drive mechanism that rotates the movable body about the optical axis according to shake, wherein the movable body and the A thermally conductive member having elasticity or viscoelasticity is provided between the fixed body and the movable body to connect them, and the movable body includes a plate member that transmits heat generated by the imaging element to the thermally conductive member. The heat conducting member is provided between the plate member and the fixed body , transmits heat generated by the imaging device to the fixed body through the plate member, and moves the movable body to the It is provided at a portion where a shearing force is mainly applied during shake correction in the rolling direction that rotates around the optical axis.
Since the heat-conducting member has elasticity or viscoelasticity, the heat of the imaging element can be released to the fixed body without impeding the movement of the movable body.

In one embodiment of the optical unit with a shake correcting function, the fixed body has a bottom plate portion disposed on the side opposite to the subject side of the movable body, and the heat conducting member comprises the bottom plate portion of the fixed body and the It is provided between the plate member provided on the bottom of the movable body.
When rolling the movable body, the heat transfer member can be arranged at the center of the rolling or at a position close to the center, suppressing an increase in the torque required for rolling drive and reducing power consumption.

In another embodiment of the optical unit with a shake correction function, the bottom of the movable body is open, a circuit board is arranged at the bottom of the movable body as the plate member on which the imaging device is mounted, and A conductive member is provided in a state of connecting between the bottom plate portion of the fixed body and the circuit board.
Since the heat of the image pickup device is transferred from the circuit board on which the image pickup device is mounted, the heat of the image pickup device can be released directly, and the heat dissipation is excellent.

In still another embodiment of the optical unit with a shake correcting function, the heat conducting member is provided at a position overlapping the imaging element when viewed from the optical axis direction.
When rolling the movable body, the heat transfer member can be arranged at the center of the rolling or at a position close to the center, suppressing an increase in the torque required for rolling drive and reducing power consumption. In addition, since the heat transfer path from the imaging device to the heat conducting member is shortened, the heat dissipation is also excellent.

In still another embodiment of the optical unit with a shake correction function, the heat conducting member has a circular shape when viewed from the optical axis direction. If the heat-conducting member is circular, it can be easily deformed during rolling or the like, which is effective in reducing power consumption.
The heat conducting member may have a square shape when viewed from the optical axis direction. Since the image pickup device is square, the thermal conduction member can be made square to secure a large area overlapping with the image pickup device, and heat dissipation can be enhanced.

In still another embodiment of the optical unit with a shake correction function, the fixed body is provided with a plurality of side plate portions surrounding the movable body, and the heat conducting member is the side plate portion of the fixed body. and a portion of the movable body facing the side plate portion. A gap for movement of the movable body is provided between the movable body and the side plate portion of the fixed body, and the heat-conducting member is arranged in the gap, so that an increase in size can be suppressed.

In this optical unit with a shake correction function, a radiator plate is provided as the plate member extending from the bottom portion of the movable body to the side surface, and the heat conducting member is provided between the radiator plate and the side plate portion of the fixed body. may be
The heat of the imaging device can be quickly transferred to the heat-conducting member by the radiator plate, and heat dissipation can be improved.

Further, in this optical unit with a shake correction function, it is preferable that the dimension of the heat conducting member in the direction of the optical axis is larger than the dimension in the direction orthogonal to the direction of the optical axis.
A spring or the like is used to support the movable body, but the movable body can also be supported by a heat-conducting member to prevent the movable body from sagging when the optical axis is oriented in the direction of gravity.

In still another embodiment of the optical unit with a shake correcting function, the heat conducting member may be provided at a portion that mainly receives a shearing force between the movable body and the fixed body during shake correction.
Since the heat-conducting member has elasticity or viscoelasticity, it can return to its original posture even if it is deformed during shake correction. In this case, if the heat-conducting member has viscoelasticity, its function may be destroyed if it is crushed to a large extent. can do.

According to the present invention, the heat transfer member having elasticity or viscoelasticity allows the heat of the imaging element to escape to the fixed body without impeding the movement of the movable body.

1 is a perspective view of an optical unit with a shake correction function according to a first embodiment of the present invention; FIG. 2 is a plan view of the optical unit with a shake correction function according to the first embodiment, viewed from the object side; FIG. FIG. 2 is a bottom view of the optical unit with a shake correction function according to the first embodiment, with the housing and the stopper plate removed, viewed from the side opposite to the subject (opposite side of the subject); FIG. 2 is a perspective view showing a part of the optical unit with a shake correction function of the first embodiment exploded along the optical axis; 5 is an exploded perspective view of a portion different from FIG. 4; FIG. 2 is a partially omitted cross-sectional view of the optical unit with a shake correction function according to the first embodiment cut along an XZ plane passing through the optical axis; FIG. FIG. 2 is a perspective view showing a state in which an outer case is removed from the state shown in FIG. 1; It is a perspective view of an elastic member. FIG. 4 is a perspective view showing the configuration inside the intermediate case in the movable body; FIG. 10 is an exploded perspective view along the optical axis direction of FIG. 9; FIG. 4 is a schematic diagram for explaining the operation of the X-axis direction drive mechanism; FIG. 8 is a plan view of the optical unit with a shake correction function according to a second embodiment of the present invention, with the housing removed, viewed from the subject side; FIG. 13 is a bottom view of the optical unit with a shake correction function of FIG. 12 with the stopper plate removed and viewed from the side opposite to the subject; FIG. 13 is a perspective view showing a part of the optical unit with a shake correction function in FIG. 12 exploded along the optical axis; 13 is a partially omitted cross-sectional view of the optical unit with a shake correction function of FIG. 12 taken along an XZ plane passing through the optical axis; FIG.

An embodiment of an optical unit with a shake correction function according to the present invention will be described below with reference to the drawings.

In the following description, the three mutually orthogonal directions are the X-axis direction, the Y-axis direction, and the Z-axis direction, respectively, and the optical axis L (the optical axis of the optical element) is arranged in the Z-axis direction in the stationary state. and In addition, +X is attached to one side of the X-axis direction, -X is attached to the other side, +Y is attached to one side of the Y-axis direction, -Y is attached to the other side, and one side of the Z-axis direction is attached. (Subject side/front side in optical axis direction) is denoted by +Z, and the other side (side opposite to the subject side (anti-subject side)/rear side in optical axis direction) is denoted by -Z. Also, the X-axis direction and the Y-axis direction are sometimes referred to as horizontal directions.

<First Embodiment>
(Schematic configuration of optical unit 101 with shake correction function)
FIG. 1 is a perspective view showing the appearance of an optical unit with a shake correction function (hereinafter abbreviated as optical unit) 101 according to the first embodiment, in which part of the housing is shown as a square plate. FIG. 2 is a plan view of the optical unit 101 viewed from the object side (+Z side in the Z-axis direction). FIG. 3 is a bottom view of the optical unit 101 viewed from the side opposite to the subject (anti-subject side; -Z side in the Z-axis direction) with the housing and some parts removed. 4 and 5 are perspective views showing the optical unit 101 partially exploded along the optical axis L. FIG. FIG. 6 is a partially omitted cross-sectional view along the XZ plane of the optical unit 101 (the support structure and the like for the optical element 110 are omitted).

The optical unit 101 is a thin camera incorporated in an optical device (not shown) such as an imaging device mounted on a mobile terminal, a drive recorder, an unmanned helicopter, etc., and is mounted while being supported by a housing of the optical device. be. The optical unit 101 includes an optical element 110 and an imaging element 111 positioned on the optical axis L of the optical element 110, a movable body 10 supporting the optical element 110 and the imaging element 111, and a fixed body 20 surrounding the movable body 10. , a rolling support mechanism 30 for supporting the movable body 10 on the fixed body 20 so as to be rotatable about the optical axis L, and a rolling correction driving mechanism 40 for rotating the movable body 10 about the optical axis L with respect to the fixed body 20. And prepare.
In addition, the movable body 10 includes therein an X-axis direction driving mechanism 80 for moving the optical element 110 in the X-axis direction when viewed in the optical axis L direction, and a Y-axis direction driving mechanism 80 when the optical element 110 is viewed in the optical axis L direction. and a focus mechanism (not shown) for moving the optical element 110 in the optical axis L (Z-axis) direction with respect to the imaging element 111 .

(Configuration of fixed body 20)
As shown in FIGS. 1 and 2 and the like, the fixed body 20 has a rectangular tubular outer case 210 that surrounds the movable body 10 and a housing 220 that fixes the outer case 210 . FIG. 1 and the like show a plate-like portion that constitutes part of the housing 220 (this plate-like portion is designated as a housing and denoted by reference numeral 220). It is provided on the side opposite to the subject with respect to the case 210 and constitutes the bottom plate portion of the fixed body 20 . As shown in FIG. 2, the outer case 210 is formed in a square frame shape having four side plate portions 211 when viewed in the Z-axis direction. In the outer case 210 , the lower end of the side plate portion 211 (the other side in the Z-axis direction −Z end portion) is fixed to the surface of the plate-like portion (housing) 220 . In the embodiment, the four side plate portions 211 are arranged along the X-axis direction or the Y-axis direction.
One end of the elastic member 31 forming the rolling support mechanism 30 and the rolling coil 42 forming the rolling correction driving mechanism 40 are fixed to the inner peripheral surface of the outer case 210 .

(Configuration of movable body 10)
The movable body 10 includes an optical element (lens group) 110 and an imaging element 111, a rectangular inner case 12 that holds the optical element 110, a rectangular intermediate case 13 that further surrounds the inner case 12, and an outer peripheral surface of the intermediate case 13. It has a rectangular cylindrical frame 14 and a circuit board 15 which are integrally provided in the body.
A focus drive mechanism (not shown) is provided between the optical element 110 and the inner case 12 . Further, between the inner case 12 and the intermediate case 13, a case support mechanism 70 for supporting the inner case 12 so as to be movable in the X-axis direction and the Y-axis direction when viewed from the direction of the optical axis L (Z-axis); An X-axis direction driving mechanism 80 for moving the case 12 in the X-axis direction and a Y-axis direction driving mechanism 90 for moving the inner case 12 in the Y-axis direction are provided. The details of the structure inside the intermediate case 13 will be described later.

In the intermediate case 13, a top plate portion 133 having a hole 132 in the center is integrally formed at one end (+Z side in the Z-axis direction) of a square cylindrical side plate portion 131. As shown in FIG.
The frame 14 is formed in a square tube shape surrounding the outer periphery of the intermediate case 13, and the inner surfaces of the four side plate portions 141 are integrated with the outer surfaces of the side plate portions 131 of the intermediate case 13 in close contact. Further, as shown in FIGS. 4 and 7, four corners of the frame 14 are radially outwardly arranged along the diagonal lines of the square (in the direction of 45° from the X-axis direction and the Y-axis direction). Two rib-like protrusions 142 and a notch 143 arranged therebetween are formed along the Z-axis direction. An end plate portion 144 is provided on one end face of both protrusions 142 in the Z-axis direction (the end face on the −Z side) so as to protrude into the notch portion 143 . A tip edge of the end plate portion 144 is arranged on a diagonal line of the frame 14 .

A rectangular circuit board 15 is fixed to the −Z side (opposite side of the subject) of the intermediate case 13 in the Z-axis direction so as to close the opening of the intermediate case 13 and constitute the bottom of the movable body 10 . . The circuit board 15 is made of, for example, glass epoxy resin impregnated with glass fiber, and its outer peripheral edge when viewed from the optical axis L is arranged parallel to the X-axis direction or the Y-axis direction. An imaging device 111 is mounted at the center of the circuit board 15 and held toward the inside of the intermediate case 13 . The circuit board 15 also includes a sensor such as a gyroscope (angular velocity sensor) for detecting changes in the inclination of the optical element 110, and a drive and control unit for the X-axis direction driving mechanism 80 and the Y-axis direction driving mechanism 90. A drive circuit, a control circuit, etc. are mounted for this purpose.

A flexible wiring board 151 is connected to the circuit board 15 and drawn out to the outside.
The circuit board 15 is spaced apart from the plate-like portion 220 of the housing, and in the space there is a connector (heat-conducting material) made of a heat-conducting material that connects the circuit board 15 and the plate-like portion 220 . member) 16 is provided.
Reference numeral 215 in the drawing denotes a frame-shaped stopper plate fixed to the inner peripheral portion of the outer case 210 of the fixed body 20, and restricts movement of the frame 14 of the movable body 10 in the Z-axis direction on the -Z side. are doing.

(Configuration of rolling support mechanism 30)
The rolling support mechanism 30 is configured by four elastic members 31 in the first embodiment (see FIG. 4). These elastic members 31 are plate springs 31 (the same reference numerals as those of the elastic members are used) that bend and deform around the optical axis L. As shown in FIG.
As shown in FIG. 8, each leaf spring 31 is formed into a U-shaped plate by press-molding an elastic plate material, and both ends 311 and 312 are bent 90°. It is said that Both ends 311 and 312 are formed to have a wider area than the U-shaped portion 313 for attachment to other members, and are formed with holes 314 for screw fixation.
The plate spring 31 is fixed so as to connect the inner peripheral portion of the outer case 210 of the fixed body 20 and the outer peripheral portion of the frame 14 of the movable body 10, as shown in FIG.

In this case, the inner peripheral portion of the outer case 210 is formed with a rectangular notch 213 viewed from the Z-axis direction in a direction of 45° with respect to the X-axis direction and the Y-axis direction. In other words, the cutouts 213 are formed at four diagonal positions on the inner periphery of the outer case 210 . On the other hand, the notch 143 is formed in the outer peripheral portion of the frame 14 in the direction of 45° with respect to the X-axis direction and the Y-axis direction, as described above. Both the outer case 210 and the frame 14 are formed in a rectangular tubular shape. The notch 213 of the outer case 210 and the notch 143 of the frame 14 face each other at their diagonal positions, and the notch 213 is located at the end on the -Z side in the Z axis direction. , 143, an end plate portion 144 of the frame 14 is arranged.

As shown in FIGS. 1 to 3 and 5, the leaf spring 31 has its U-shaped portion 313 arranged in each notch 213 of the outer case 210, and one end 311 of both ends is It is fixed to one end surface of the outer case 210 (the end surface on the -Z side in the Z-axis direction), and the other end portion 312 is a part of the end plate portion 144 of the frame 14 arranged in the cutout portion 213 of the outer case 210. It is fixed to the end face (the end face on the -Z side in the Z-axis direction). Since the tip edge of the end plate portion 144 is arranged along the diagonal line of the frame 14, the U-shaped portion 313 of the plate spring 31 is located at each notch portion 213 of the outer case 210 when viewed from the Z-axis direction. , along a direction at 45° to the X-axis direction and the Y-axis direction. The U-shaped portion 313 is flexurally deformed with respect to the rotation of the frame 14 about the optical axis L, so that the rotation of the frame (movable body) 13 about the optical axis L is permitted. It has become. This flexural deformation of the leaf spring 31 is a deformation in which both ends of the U-shaped portion 313 are shifted so as to open in a direction (thickness direction) substantially perpendicular to the surface thereof. When no external force acts on the frame 14 and no load is applied, the leaf spring 31 restores the U-shaped portion 313 to a flat plate shape, so that the frame 14 and the outer case 210 are separated from each other by the side plates of the frame 14 and the outer case 210 . The portions 141 and 211 are returned to the initial position in which they are arranged parallel to each other.
The fixing of the leaf spring 31 to the frame body 14 and the outer case 210 is not limited to screwing, but may be performed by bonding, fitting, locking, or the like between the two.

(Configuration of Rolling Correction Drive Mechanism 40)
As shown in FIG. 4, the rolling correction driving mechanism 40 is composed of a magnetic driving mechanism having a rolling magnet 41 and a rolling coil 42 capable of generating an electromagnetic force within the magnetic field of the rolling magnet 41. .
In this embodiment, a combination of one rolling magnet 41 and one rolling coil 42 facing this one rolling magnet 41 is spaced 180° in the circumferential direction of the optical axis L. 2 sets are provided. Specifically, rectangular notches 145 are formed in the frame 14 at intervals of 180° in the circumferential direction of the optical axis L, and the rolling magnets 41 are accommodated in the notches 145 . A rolling coil 42 is fixed to the inner peripheral portion of the outer case 210 so as to face the rolling magnet 41 of the frame 14 . The two rolling magnets 41 are arranged on the Y-axis passing through the optical axis L, respectively. The rolling magnet 41 is magnetized with different magnetic poles in the X-axis direction, and the magnetization polarization line 411 is arranged along the Z-axis direction. The two rolling magnets 41 are formed to have the same thickness and the same planar shape.

On the other hand, the rolling coil 42 is an air-core coil that does not have a magnetic core (core), and is formed in an annular shape by winding with the Y-axis direction as the axial direction of the coil. Each rolling coil 42 has two long side portions 421 spaced apart in the X-axis direction and two arcuate short side portions 422 connecting the two ends of the long side portions 421. It is formed in an oval shape in plan view. As described above, the rolling magnet 41 is magnetized with different magnetic poles in the X-axis direction. be. That is, the long side portion 421 of the rolling coil 42 is used as an effective side facing the magnetic poles of the rolling magnet 41 . The two long side portions 421 of these rolling coils 42 are arranged at equal distances from the magnetized polarization lines 411 of the rolling magnets 41 .

The rolling correction drive mechanism 40 applies an electromagnetic force to the magnet 41 toward either the +X side or the -X side in the X-axis direction according to Fleming's left-hand rule when a current is applied to the rolling coil 42. , the combination of the two sets of magnets 41 and coils 42 rotates the frame 14 (movable body 10) around the optical axis L. As shown in FIG.

(Configuration of connector 16)
In FIGS. 3, 5 and 6, the connection body 16 provided between the circuit board 15 integral with the movable body 10 and the plate-like portion (housing) 220 of the fixed body 20 is mounted on the circuit board 15. It is used to transmit heat generated by the imaging element 111 to the fixed body 20 and has elasticity or viscoelasticity so as not to hinder the movement of the movable body 10 . In the illustrated example, it is formed in the shape of a square plate, the center of the outer shape is arranged on the optical axis L, and the four sides of the outer periphery are arranged along the X-axis direction or the Y-axis direction. An imaging element 111 is provided on the optical axis L on the surface of the circuit board 15 opposite to the connector 16 . The image pickup device 111 is formed in a square shape in a plan view (as seen in the Z-axis direction), and the connection body 16 is provided at a position overlapping the image pickup device 111 on the optical axis L. The 16 four sides are arranged so as to be parallel to each other. In the embodiment, the four sides of the imaging device 11 and the four sides of the connector 16 are arranged along the X-axis direction or the Y-axis direction.

In this embodiment, the connector 16 is a viscoelastic member. Viscoelasticity is a property that combines both viscosity and elasticity, and is a property that is conspicuously observed in polymeric substances such as gel-like members, plastics, and rubbers. Therefore, various gel-like members can be used as the viscoelastic member. As the viscoelastic member, natural rubber, diene rubber (e.g., styrene/butadiene rubber, isoprene rubber, butadiene rubber), chloroprene rubber, acrylonitrile/butadiene rubber, etc.), non-diene rubber (e.g., butyl rubber, ethylene/propylene rubber) Various rubber materials such as rubber, ethylene-propylene-diene rubber, urethane rubber, silicone rubber, fluororubber, thermoplastic elastomer, and modified materials thereof may be used.

In this embodiment, the connector 16 is made of silicone gel with a penetration of 90 degrees to 110 degrees. Penetration is defined by JIS-K-2207 and JIS-K-2220, the depth that a 1/4 cone needle with a total load of 9.38g at 25°C penetrates for 5 seconds. is expressed in units of 1/10 mm, and the smaller this value is, the harder it is.
In order to increase the thermal conductivity of the connecting body 16, it is preferable that the viscoelastic material is mixed with powder such as metal or carbon having a high thermal conductivity.
When correcting the rolling, the connector 16 is deformed in a direction (shearing direction) intersecting the thickness direction (optical axis L direction). It is a deformation in the direction of stretching and stretching in any direction.

(Configuration inside intermediate case 13 in movable body 10)
As described above, the intermediate case 13 of the movable body 10 contains the optical element (lens group) 110, the imaging element 111, the rectangular inner case 12 for holding the optical element 110, and the optical element 110 in the optical axis direction. A focus drive mechanism (not shown) that moves along the rim, a case support mechanism 70 that supports the inner case 12, an X-axis direction drive mechanism 80 and a Y-axis direction drive mechanism 90 are provided. The configuration inside the intermediate case 13 is shown in FIGS. 9 and 10. FIG.

The case support mechanism 70 has two springs (a front side spring 71 and a rear side spring 72 ) and a plurality of wires 73 .
The optical element 110 is held by a sleeve-shaped lens holder 112, and most of it is accommodated in the inner case 12. Its front end (one +Z side end in the Z-axis direction) extends from the inner case 12 to the Z-axis. It protrudes in one direction +Z, and its protruding end is fixed to the inner peripheral portion of the front side spring 71 . The rear end of the lens holder 112 (an end on the other -Z side in the Z-axis direction, not shown) is fixed to the inner periphery of the rear spring 72, and the inner periphery of the inner case 12 is fixed to the inner periphery of the inner case 12 via the rear spring 72. supported by the department.
The front side spring 71 and the rear side spring 72 are formed in a plate shape, and the inner peripheral portions 71a and 72a are movable relative to the outer peripheral portions 71b and 72b in the plate thickness direction (Z-axis direction, optical axis L direction). The optical element 110 (lens holder 112) is formed in a shape that can be elastically deformed, and the optical element 110 (lens holder 112) is supported by the front side spring 71 and the rear side spring 72 so as to be movable in the optical axis L direction. The optical element 110 is moved in the optical axis L direction by a focus driving mechanism (not shown) provided between the inner case 12 and the optical element 110 .

Further, the front spring 71 is integrally formed with protruding portions 711 that protrude in the directions of the four corners of the inner case 12, that is, in directions inclined by 45° in the X-axis direction and the Y-axis direction. The ends of four wires 73 arranged outside the four corners of the inner case 12 are fixed to the circuit board 15 arranged on the −Z side of the inner case 12 in the Z-axis direction. These wires 73 extend toward +Z in the Z-axis direction, and projecting portions 711 of the front side springs 71 are fixed to the ends thereof.
The wires 73 connecting the front spring 71 and the circuit board 15 are arranged at the four corners of a quadrangle having sides in the X-axis direction and the Y-axis direction when viewed from +Z, one of the Z-axis directions. Therefore, the front spring 71 fixed to the front end of the optical element 110 is supported by the circuit board 15 by the wire 73 , and the wire 73 is flexurally deformed to fix the wire 73 to the circuit board 15 . It is supported so as to be movable in substantially the X-axis direction and the substantially Y-axis direction around a point.

An X-axis driving mechanism 80 and a Y-axis driving mechanism 90 are provided between the inner case 12 and the coil holder 17 integrated with the intermediate case 13 . In this case, the X-axis direction drive mechanisms 80 are arranged on both sides of the inner case 12 in the Y-axis direction with the optical axis L interposed therebetween, and the Y-axis direction drive mechanisms 90 are arranged on both sides of the inner case 12 with the optical axis L interposed therebetween. located on both sides of the direction.
The X-axis direction driving mechanism 80 and the Y-axis direction driving mechanism 90 are configured by combining magnets 81, 91 and coils 82, 92, respectively.
The magnet 81 of the X-axis direction driving mechanism 80 and the magnet 91 of the Y-axis direction driving mechanism 90 are fixed to the outer surface of each side plate portion 121 of the inner case 12 .

On the other hand, a rectangular frame-shaped coil holder 17 projecting outward from the inner case 12 is fixed on the circuit board 15 . are fixed, and coils 82 and 92 face magnets 81 and 91 on the outer surface of the inner case 12 . Since the circuit board 15 is fixed to the intermediate case 13 , the coils 82 and 83 are fixed to the intermediate case 13 .
Each of the coils 82, 92 is wound in an oval flat plate shape, and two coils are lined up on each side of the rectangular frame-shaped coil holder 17, and a total of eight coils 82, 92 are fixed. ing. In this case, each of the coils 82 and 92 is fixed to the coil holder 17 at one short side portion 821 and 921 of the oval shape, and two coils are arranged so as to face each side surface of the inner case 12 . Therefore, the two long side portions 822, 922 excluding the short side portions 821, 921 at the upper and lower ends of the coils 82, 92 are arranged along the Z-axis direction.

Four rectangular plate-shaped magnets 81 and 91 are provided on each side surface of the inner case 12 . That is, four magnets 81 and 91 are arranged on each side surface of the inner case, and two magnets 81 and 91 are arranged so as to face the long sides 822 and 922 of the two coils 82 and 92 . It is The four magnets 81 and 91 are alternately arranged with N poles and S poles. For example, in the combination of the magnet 81 and the coil 82 of the X-axis direction driving mechanism 80 shown in FIG. , the surface facing the coil 82 is magnetized to the S pole, and sequentially magnetized to the N pole and the S pole alternately. Therefore, in one coil 82, the magnet 81 magnetized to the N pole and the magnet 81 magnetized to the S pole are arranged so as to face each of the two long side portions 822. .

A combination of magnets 81 and coils 82 arranged on both sides of the inner case 12 in the Y-axis direction constitutes an X-axis direction driving mechanism 80 that moves the inner case 12 substantially in the X-axis direction. On the other hand, a combination of magnets 91 and coils 92 arranged on both sides in the X-axis direction constitutes a Y-axis direction driving mechanism 90 that moves the inner case 12 in the Y-axis direction.
In other words, the magnet 81 and the coil 82 of the X-axis direction driving mechanism 80 direct the magnet 81 to either the +X side or the -X side in the X-axis direction according to Fleming's left-hand rule when a current is passed through the coil 82. The inner case 12 is moved in the X-axis direction by the combination of the two sets of magnets 81 and coils 82 . In the example shown in FIG. 11, the magnet 81 is moved rightward in the figure.

On the other hand, the magnet 91 and the coil 92 of the Y-axis direction driving mechanism 90 are directed to either the +Y side or the -Y side in the Y-axis direction to the magnet 91 according to Fleming's left-hand rule when a current is passed through the coil 92. Electromagnetic force is applied, and the combination of two sets of magnets 91 and coils 92 moves the inner case 12 in the Y-axis direction.
In this case, since the inner case 12 is supported by the wires 73 via the front springs 71 , the bending of the wires 73 causes the wire 73 to move around the fixed point of the wire 73 on the circuit board 15 in the substantially X-axis direction and substantially the Y-axis direction. In FIG. 10, reference numeral 18 denotes a sensor protective cover that surrounds the imaging element 111 on the upper surface of the circuit board 15, and reference numeral 19 denotes a spacer provided between the inner case and the front spring.

(main operation)
In the optical unit 101 configured as described above, the optical element 110 is moved in the front-rear and left-right directions (X-axis direction and Y-axis direction) together with the inner case 12 by the X-axis direction driving mechanism 80 and the Y-axis direction driving mechanism 90. be able to. Therefore, it is possible to correct the displacement of the photographed image due to shake in the direction substantially perpendicular to the optical axis L direction. The circuit board 15 on which the imaging element 111 is mounted does not move during the movement in the X-axis direction and the Y-axis direction.
On the other hand, the intermediate case 13 can be rotated around the optical axis L by the rolling correction driving mechanism 40 . Therefore, when a photographed image is deviated around the optical axis L due to shake, the shake around the optical axis L can be corrected by the driving mechanism 40 for rolling correction.

In the optical unit 101, the imaging device 111 arranged inside the movable body 10 generates heat. , is provided with a connecting body 16 that connects them. Since this connecting body 16 has thermal conductivity, the heat generated by the imaging element 111 is quickly transferred to the plate-like portion 220 and released to the fixed body 20. be able to. Moreover, since the connection body 16 is provided on the opposite side of the imaging element 111 via the circuit board 15, the heat of the imaging element 111 is quickly transmitted to the connection body 16, resulting in excellent heat dissipation.

In addition, since this connection body 16 is arranged on the optical axis L, it is twisted around the optical axis L during rolling correction, but since it acts only as a shearing force, the viscosity or viscoelasticity of the connection body 16 does not change. function can be maintained effectively. Of course, the rotation of the rolling correction is rarely hindered by the connecting member 16 . Therefore, an increase in torque required for rolling correction can be suppressed, and power consumption can be reduced.
The connection body 16 may be formed in a circular shape when viewed from the direction of the optical axis L. In that case, the deformation of the connection body 16 around the optical axis L is facilitated, and resistance to twisting during rolling correction is reduced. .
Further, even when the connection body 16 is formed in a square shape, it may be formed to have an area larger than the area of the imaging device 111 along the direction of the optical axis L, so that heat can be transferred and dissipated from the entire surface of the imaging device 111. can.

<Second embodiment>
11 to 14 show a second embodiment of the optical unit with shake correction function of the present invention. In these figures, elements common to those of the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted. The illustration of the housing 220 and the stopper plate 215 described in the first embodiment is omitted.
In this second embodiment, a radiator plate 161 is provided from the back surface of the circuit board 15 to one side plate portion 141 of the frame 14 , and a connector is provided between this radiator plate 161 and one side plate portion 211 of the outer case 210 . (Heat conducting member) 162 is provided.
The radiator plate 161 is formed of a metal plate with high thermal conductivity, such as a copper plate, and is fixed to a bottom plate portion 161a that is closely fixed to the circuit board 15 and one side plate portion 141 of the frame 14. It is formed in an L shape integrally formed with the side plate portion 161b. As shown in FIG. 12, the bottom plate portion 161a is formed in a rectangular plate shape sufficiently larger than the area of the imaging element 111 mounted on the opposite side of the circuit board 15, and is aligned with the imaging element 111 in the optical axis L direction. arranged to overlap. Therefore, the bottom plate portion 161a is provided to protrude outside the projection area of the imaging element 111 in the Z-axis direction.
A connector 162 is provided between the side plate portion 161b of the radiator plate 161 and the side plate portion 211 of the outer case 210 facing the side plate portion 161b so as to connect them. The connection body 162 is formed in a rectangular plate shape, and its four sides are arranged along the Y-axis direction or the Z-axis direction in the illustrated example.

In the case of the second embodiment, during rolling correction, the connection body 162 is deformed in a direction perpendicular to the thickness direction (shearing direction) while undergoing slight compression and elongation in the thickness direction. For this reason, the connection body 162 of the second embodiment is thicker than the connection body 16 of the first embodiment, as shown in FIG. t is large, and the width dimension W in the rolling direction (or the extending direction of the side plate portion 141 of the frame 14 (the Y-axis direction in the illustrated example)) is formed small. 15, the supporting structure of the optical element 110 and the like are omitted.

On the other hand, the dimension H of the connector 162 in the Z-axis direction is relatively large. By increasing the height H corresponding to the greater thickness t, it is made difficult to bend in the Z-axis direction. As a result, the movable body 10 can be supported by the connector 162 as well as the elastic member 31 that supports the movable body 10 . Therefore, for example, it is possible to effectively prevent the movable body 10 from sagging when the optical axis L is oriented in the direction of gravity.
In addition, as shown in FIG. 12 and the like, in the second embodiment, the connector 161 is provided substantially at the center position in the Y-axis direction. Therefore, when the movable body 10 rotates around the optical axis L during rolling correction, shear force acts mainly, and compression and expansion in the plate thickness direction are relatively small. It is not preferable to dispose the connector 161 at a position shifted in the Y-axis direction from the position shown in FIG. 12, because the compression and elongation in the plate thickness direction increase during rolling correction.

In addition, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention.
For example, in the above embodiment, the optical element 110 is supported so as to be movable in the X-axis direction and the Y-axis direction when viewed from the optical axis L direction, and is moved in the X-axis direction and the Y-axis direction by the driving mechanism during shake correction. However, the optical element 110 is oscillatably supported by a gimbal mechanism having fulcrums provided in two directions orthogonal to the direction of the optical axis L of the optical element 110, and the optical axis L is tilted by the driving mechanism during shake correction. It is good also as a structure which rocks.
Further, although the elastic member (plate spring) 31 of the rolling support mechanism 30 is formed in a U-shape, the U-shaped spring is not necessarily used as long as it can support the movable body 10 in a rolling manner. .
In the first embodiment, the connector (heat conducting member) 16 is arranged on the optical axis L, but it is also possible to arrange it at a position slightly deviated from the optical axis L. FIG. Alternatively, a plurality of them may be arranged side by side around the optical axis L in the circumferential direction. Even in that case, only shear force acts on the connecting body during rolling correction.
Moreover, even when the connection body 16 is provided on the circuit board 15 as in the first embodiment, a heat sink having excellent thermal conductivity may be interposed therebetween.

L... Optical axis 10... Movable body 20... Fixed body 12... Inner case 13... Intermediate case 14... Frame body 41... Magnet 15... Circuit board 16, 162... Connector (heat conducting member) , 17... Coil holder, 30... Rolling support mechanism, 31... Elastic member (leaf spring), 40... Rolling correction drive mechanism, 41... Rolling magnet, 42... Rolling coil, 70... Case support mechanism, 71... Front side Springs 71a, 72a... Inner peripheral part 71b, 72b... Outer peripheral part 72... Rear side spring 73... Wire 80... X-axis direction drive mechanism 90... Y-axis direction drive mechanism 81, 91... Magnet 82 , 92... Coil 101... Optical unit 110... Optical element 111... Imaging element 112... Lens holder 121, 131, 141, 211... Side plate portion 132... Hole 133... Top plate portion 142... Projection , 143, 145, 213... Notch part 144... End plate part 151... Flexible wiring board 161... Heat sink 161a... Bottom plate part 161b... Side plate part 210... Outer case 215... Stopper plate 220... Case Body (plate-like portion) 311, 312 End portion 313 U-shaped portion 314 Hole 411 Magnetized polarization line 421 Long side portion 422 Short side portion 711 Protruding portion 821 , 921... short side portion, 822, 922... long side portion.

Claims (10)

an optical element and an imaging element positioned on the optical axis of the optical element; a movable body supporting the optical element and the imaging element; a fixed body; A rolling support mechanism for freely supporting the movable body, and a rolling correction drive mechanism for rotating the movable body around the optical axis in response to vibration,
an elastic or viscoelastic thermal conduction member connecting the movable body and the fixed body is provided between the movable body and the fixed body;
The movable body is provided with a plate member that transfers heat generated by the imaging element to the heat conduction member,
The heat-conducting member is provided between the plate member and the fixed body, transmits heat generated by the imaging element to the fixed body through the plate member, and rotates the movable body around the optical axis. 1. An optical unit with a shake correction function, characterized in that it is provided at a portion where a shearing force acts mainly during shake correction in a rolling direction in which the optical unit is rotated.
The fixed body has a bottom plate portion disposed on the opposite side of the movable body to the subject, and the heat conducting member is disposed between the bottom plate portion of the fixed body and the plate member provided on the bottom portion of the movable body. 2. The optical unit with a shake correction function according to claim 1, wherein the optical unit is provided in a . A bottom portion of the movable body is open, and a circuit board is arranged on the bottom portion of the movable body as the plate member on which the imaging element is mounted, and the heat conducting member is formed by the bottom plate portion of the fixed body and the circuit board. 3. The optical unit with a shake correcting function according to claim 2, wherein the optical unit is provided in a state of being connected between and. 4. The optical unit with a shake correction function according to claim 1, wherein the thermally conductive member is provided at a position overlapping with the imaging element when viewed from the optical axis direction. 5. The optical unit with a shake correction function according to claim 1, wherein the thermally conductive member has a circular shape when viewed from the optical axis direction. 5. The optical unit with a shake correction function according to claim 1, wherein the thermally conductive member has a rectangular shape when viewed from the optical axis direction. The fixed body is provided with a plurality of side plate portions surrounding the movable body, and the heat conducting member is provided between the side plate portion of the fixed body and a portion facing the side plate portion of the movable body. 2. The optical unit with a shake correction function according to claim 1, wherein the optical unit is provided in a . 8. A radiator plate is provided as the plate member extending from the bottom portion of the movable body to the side surface, and the heat conducting member is provided between the radiator plate and the side plate portion of the fixed body. optical unit with image stabilization function. 9. An optical unit with a shake correction function according to claim 7, wherein the heat conducting member has a dimension in the direction of the optical axis larger than a dimension in a direction orthogonal to the direction of the optical axis. 10. The shake correcting function according to claim 1, wherein the heat conducting member is provided at a portion that mainly receives only a shear force between the movable body and the fixed body during shake correction. optical unit with.

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