JP2011069882A - Blur-correcting device and image pickup device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blur-correcting device which prevents a piezoelectric element from being damaged. <P>SOLUTION: A pair of actuators 10, 17 which move an imaging element 4a in two directions orthogonal to an optical axial direction includes: a weight member 11 fixed to a fixing member 5; a piezoelectric element 12 whose one end face in expanding and contracting direction is fixed to the weight member; a driving shaft 13 which is supported by the shaft-supporting holes 7a, 8a of the fixing member and whose one end face 13a is connected to the other end face 12a of the piezoelectric element, and which moves with the expansion and contraction of the piezoelectric element; and a first and second magnetic bodies 14, 15 which use magnetic force to bias the driving shaft toward the piezoelectric element side to connect one end face of the driving shaft to the other end face of the piezoelectric element. In this case, either the first magnetic body or the second magnetic body is fixed to the driving shaft, and the other is fixed to the fixing member or the weight member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technical field of a shake correction apparatus and an imaging apparatus. More specifically, the present invention relates to a technical field in which a first magnetic body and a second magnetic body that urge a drive shaft toward the piezoelectric element side by magnetic force are provided to prevent the piezoelectric element from being damaged.

  Some imaging apparatuses such as a video camera and a still camera are provided with a blur correction apparatus that performs blur correction by moving a lens or an imaging element in a direction orthogonal to the optical axis direction.

  In such a shake correction device, there is one in which a lens or an image pickup device can be moved in two directions of a first direction and a second direction orthogonal to the optical axis direction by a pair of actuators having a piezoelectric element ( For example, see Patent Document 1).

  In the shake correction apparatus described in Patent Document 1, the actuator is configured by a weight member, a piezoelectric element, and a drive shaft, one end surface of the piezoelectric element is fixed to the weight member, and the other end surface of the piezoelectric element is fixed to the drive shaft. The weight member is fixed to the fixed member, and the drive shaft is slidably supported by the pair of shaft support portions. When the piezoelectric element is expanded or contracted according to the applied voltage, the drive shaft fixed to the piezoelectric element is moved in the axial direction, and the lens or the image sensor is orthogonal to the optical axis direction as the drive shaft moves in the axial direction. The camera shake is corrected by moving in the first direction or the second direction.

  The weight member is fixed to the fixing member with an adhesive.

JP 2006-81348 A

  However, in the shake correction apparatus as described above, there is a possibility that an external force is applied to the piezoelectric element and the weight member from the direction orthogonal to the expansion / contraction direction of the piezoelectric element when the actuator is attached to the fixing member. When such an external force is applied, the actuator is formed long in the expansion / contraction direction of the piezoelectric element, so that the piezoelectric element is bent with respect to the drive shaft, and the piezoelectric element may be damaged depending on the bent state.

  In addition, in a state where the actuator is assembled to a fixed member or the like, for example, an external force may be applied to the actuator from a direction orthogonal to the expansion / contraction direction of the piezoelectric element due to vibration or impact caused by dropping of the imaging device or the like. In this case, since the drive shaft is supported by the shaft support portion, it is difficult to bend. However, if a force exceeding the allowable deformation amount of the adhesive is applied to the piezoelectric element and the weight member, the piezoelectric element is still against the drive shaft. May be bent and damaged.

  Accordingly, an object of the present invention is to overcome the above-described problems and prevent damage to the piezoelectric element.

  In order to solve the above-described problem, the shake correction apparatus includes a pair of actuators that move the lens or the image sensor in two directions orthogonal to the optical axis direction and orthogonal to each other, a base portion, and a shaft support that protrudes from the base portion. And a pair of fixing members that hold the pair of actuators, respectively, and the actuator includes a weight member fixed to the fixing member and an applied voltage. Accordingly, the piezoelectric element having one end face in the extension / contraction direction fixed to the weight member and the pair of shaft support holes of the fixing member are slidably supported in the axial direction and the one end face in the axial direction is A driving shaft connected to the other end surface in the expansion / contraction direction of the piezoelectric element and moved in the axial direction as the piezoelectric element expands / contracts, and the driving shaft is compressed by the magnetic force. There is provided a first magnetic body and a second magnetic body that are biased toward the element side and connect the one end surface of the drive shaft in the axial direction to the other end surface of the piezoelectric element in the expansion / contraction direction. The magnetic body and the second magnetic body are disposed apart from each other in the axial direction, and are disposed closer to the piezoelectric element than the shaft support portion located on the piezoelectric element side of the fixing member. One of the body and the second magnetic body is fixed to the drive shaft, and the other is fixed to the fixing member or the weight member.

  Therefore, in the shake correction device, the drive shaft is biased toward the piezoelectric element by the first magnetic body and the second magnetic body, one of which is fixed to the drive shaft and the other is fixed to the fixed member or the weight member. Thus, one end surface in the axial direction of the drive shaft is connected to the other end surface in the expansion / contraction direction of the piezoelectric element.

  In the above-described shake correction device, the first magnetic body is fixed to the drive shaft, and the second magnetic body is disposed closer to the piezoelectric element than the first magnetic body and fixed to the fixing member. And at least one of the first magnetic body and the second magnetic body is constituted by a magnet, the first magnetic body is attracted to the second magnetic body side, and the drive shaft is attached to the piezoelectric element side. It is desirable to be supported.

  At least one of the first magnetic body and the second magnetic body is constituted by a magnet so that the first magnetic body is attracted toward the second magnetic body and the drive shaft is biased toward the piezoelectric element. Thus, the drive shaft is coupled to the piezoelectric element by the attractive force of the magnet.

  In the above shake correction apparatus, the second magnetic body is formed in an annular shape having an insertion hole, the piezoelectric element is inserted into the insertion hole of the second magnetic body, and the outer diameter of the piezoelectric element is inserted into the insertion hole. It is desirable to make it smaller than the diameter of the hole.

  When the piezoelectric element is displaced in a direction perpendicular to the drive axis by inserting the piezoelectric element through the insertion hole of the second magnetic body and making the outer diameter of the piezoelectric element smaller than the diameter of the insertion hole. In addition, the piezoelectric element is moved in the insertion hole.

  In the shake correction device, the first magnetic body is disposed on the drive shaft side and fixed to the fixing member, and the second magnetic body is disposed on the piezoelectric element side and fixed to the drive shaft. The first magnetic body and the second magnetic body are both constituted by magnets, and the second magnetic body is repelled toward the piezoelectric element with respect to the first magnetic body, and the drive shaft Is preferably urged toward the piezoelectric element.

  Both the first magnetic body and the second magnetic body are constituted by magnets, the second magnetic body is repelled toward the piezoelectric element side with respect to the first magnetic body, and the drive shaft is biased toward the piezoelectric element side. By doing so, the drive shaft is connected to the piezoelectric element by the repulsive force of the magnet.

  In the above-described shake correction device, the weight member is provided with a protective wall portion that covers at least a part of the piezoelectric element from the outer peripheral side, the first magnetic body is fixed to the drive shaft, and the second magnetic body Is arranged on the piezoelectric element side of the first magnetic body and fixed to the front end surface of the protective wall portion of the weight member, and at least one of the first magnetic body and the second magnetic body is formed by a magnet. Preferably, the first magnetic body is attracted to the second magnetic body side and the drive shaft is biased to the piezoelectric element side.

  By providing the weight member with a protective wall portion that covers at least a part of the piezoelectric element from the outer peripheral side, the displacement in the direction perpendicular to the axial direction with respect to the drive axis of the piezoelectric element is performed while being covered from the periphery by the protective wall portion. Is called.

  In order to solve the above-described problem, the imaging device includes a shake correction device that corrects the shake by moving the lens or the image pickup device in a direction orthogonal to the optical axis direction, and the shake correction device includes the lens or the image pickup device. A pair of actuators that move in two directions perpendicular to the optical axis and perpendicular to each other; a base portion; and a pair of shaft support portions that protrude from the base portion and have shaft support holes formed therein; A pair of fixing members to be held, and the actuator includes a weight member fixed to the fixing member, and a piezoelectric element that is expanded and contracted according to an applied voltage and has one end surface in the expansion / contraction direction fixed to the weight member. The one end surface in the axial direction is supported by the pair of shaft support holes of the fixing member so as to be slidable in the axial direction. A drive shaft that moves in the axial direction as the piezoelectric element expands and contracts, and biases the drive shaft toward the piezoelectric element by a magnetic force so that the one end surface of the drive shaft in the axial direction is A first magnetic body and a second magnetic body that are connected to the other end surface of the piezoelectric element in the expansion / contraction direction are provided, and the first magnetic body and the second magnetic body are spaced apart in the axial direction. In addition, a shaft support portion located on the piezoelectric element side of the fixing member is disposed on the piezoelectric element side, and one of the first magnetic body and the second magnetic body is fixed to the drive shaft and the other is It is fixed to the fixed member or the weight member.

  Therefore, in the imaging apparatus, the drive shaft is biased toward the piezoelectric element by the first magnetic body and the second magnetic body, one of which is fixed to the drive shaft and the other is fixed to the fixed member or the weight member. One end surface in the axial direction of the drive shaft is connected to the other end surface in the expansion / contraction direction of the piezoelectric element.

  The blur correction device of the present invention includes a pair of actuators that move a lens or an image sensor in two directions orthogonal to the optical axis direction and orthogonal to each other, a pair of base portions, and a pair of shaft support holes that are projected from the base portions. A pair of fixing members each having a shaft support portion and holding the pair of actuators, wherein the actuators are expanded and contracted according to the applied voltage, and weight members fixed to the fixing members. One end surface of the piezoelectric element is fixed to the weight member, and one end surface in the axial direction is supported in a pair of shaft support holes of the fixing member so as to be slidable in the axial direction. A drive shaft connected to an end face and moved in the axial direction as the piezoelectric element expands and contracts, and the drive shaft is biased toward the piezoelectric element by magnetic force to drive the drive. A first magnetic body and a second magnetic body are provided to connect the one end surface of the shaft in the axial direction to the other end surface of the piezoelectric element in the expansion / contraction direction, and the first magnetic body and the second magnetic body are provided. A body is disposed apart from the axial direction and is disposed closer to the piezoelectric element than a shaft support portion located on the piezoelectric element side of the fixing member, and the first magnetic body and the second magnetic body One is fixed to the drive shaft, and the other is fixed to the fixing member or the weight member.

  Therefore, the piezoelectric element is not bent with respect to the drive shaft, and damage to the piezoelectric element can be prevented.

  According to a second aspect of the present invention, the first magnetic body is fixed to the drive shaft, and the second magnetic body is disposed closer to the piezoelectric element than the first magnetic body and is fixed. Fixed to a member, and at least one of the first magnetic body and the second magnetic body is constituted by a magnet, the first magnetic body is attracted to the second magnetic body side, and the drive shaft is moved to the piezoelectric body. The element is biased toward the element side.

  Therefore, the configuration in which the drive shaft is urged toward the piezoelectric element can be realized by a simple mechanism, and the mechanism for preventing the piezoelectric element from being damaged can be simplified.

  According to a third aspect of the present invention, the second magnetic body is formed in an annular shape having an insertion hole, the piezoelectric element is inserted into the insertion hole of the second magnetic body, and the outside of the piezoelectric element is inserted. The diameter is smaller than the diameter of the insertion hole.

  Therefore, when the piezoelectric element is displaced in a direction perpendicular to the axial direction with respect to the drive shaft, it is possible to prevent the piezoelectric element from contacting other members, and to prevent the piezoelectric element from being damaged or damaged. can do.

  In the invention described in claim 4, the first magnetic body is disposed on the drive shaft side and fixed to the fixing member, and the second magnetic body is disposed on the piezoelectric element side and The first magnetic body and the second magnetic body are both made up of magnets, fixed to the drive shaft, and the second magnetic body is repelled toward the piezoelectric element relative to the first magnetic body. The drive shaft is biased toward the piezoelectric element.

  Therefore, the configuration in which the drive shaft is urged toward the piezoelectric element can be realized by a simple mechanism, and the mechanism for preventing the piezoelectric element from being damaged can be simplified.

  In the invention described in claim 5, the weight member is provided with a protective wall portion that covers at least a part of the piezoelectric element from the outer peripheral side, the first magnetic body is fixed to the drive shaft, and the first The second magnetic body is disposed on the piezoelectric element side of the first magnetic body and fixed to the front end surface of the protective wall portion of the weight member, and at least one of the first magnetic body and the second magnetic body One of them is constituted by a magnet so that the first magnetic body is attracted to the second magnetic body side and the drive shaft is biased to the piezoelectric element side.

  Accordingly, since the piezoelectric element is covered and protected from the surroundings by the protective wall portion, when the piezoelectric element is displaced in the direction orthogonal to the axial direction with respect to the drive shaft, the piezoelectric element contacts other members. It is possible to prevent damage and damage to the piezoelectric element.

  The image pickup apparatus of the present invention includes a shake correction device that corrects a shake by moving a lens or an image pickup device in a direction orthogonal to the optical axis direction. The shake correction device has the lens or the image pickup device orthogonal to the optical axis and orthogonal to each other. A pair of actuators that respectively move in two directions, a pair of fixing members that have a base portion and a pair of shaft support portions that protrude from the base portion and have shaft support holes formed therein, and hold the pair of actuators, respectively The actuator includes: a weight member fixed to the fixing member; a piezoelectric element that is expanded and contracted according to an applied voltage and having one end surface in the expansion / contraction direction fixed to the weight member; and a pair of the fixing member The axial support hole is slidably supported in the axial direction, and one end surface in the axial direction is connected to the other end surface in the expansion / contraction direction of the piezoelectric element, and the piezoelectric element expands and contracts. And a driving shaft that is moved in the axial direction. The driving shaft is biased toward the piezoelectric element by a magnetic force, and the one end surface of the driving shaft in the axial direction is expanded and contracted in the piezoelectric element. Provided with a first magnetic body and a second magnetic body to be connected to the other end surface, wherein the first magnetic body and the second magnetic body are spaced apart in the axial direction and One of the first magnetic body and the second magnetic body is fixed to the drive shaft and the other is the fixed member or the weight member. It is fixed to.

  Therefore, the piezoelectric element is not bent with respect to the drive shaft, and damage to the piezoelectric element can be prevented.

  The best mode for carrying out the image blur correction apparatus and the image pickup apparatus of the present invention will be described below with reference to the accompanying drawings.

  In the best mode described below, the imaging apparatus of the present invention is applied to a digital still camera, and the blur correction apparatus of the present invention is applied to a blur correction apparatus provided in the digital still camera.

  Note that the application ranges of the imaging apparatus and the shake correction apparatus according to the present invention are not limited to the digital still camera and the shake correction apparatus provided in the digital still camera, respectively. The imaging apparatus and the shake correction apparatus according to the present invention include, for example, an imaging apparatus incorporated in various devices such as a video camera, a personal computer, a mobile phone, and a PDA (Personal Digital Assistant), or a shake correction apparatus provided in these imaging apparatuses. Can be widely applied to.

  In the following description, it is assumed that the front, rear, up, down, left, and right directions are shown in the direction seen from the photographer when photographing with the digital still camera. Therefore, the subject side is the front and the photographer side is the rear.

  In addition, the front and rear, up and down, left and right directions shown below are for convenience of explanation, and the implementation of the present invention is not limited to these directions.

  Moreover, the lens shown below is meant to include both a lens constituted by a single lens and a lens group constituted by a plurality of lenses.

[Blur correction device]
Hereinafter, an embodiment of the shake correction apparatus will be described.

  The shake correction apparatus 1 includes a first base plate 2 and a first slider 3, and the first base plate 2 and the first slider 3 are arranged apart from each other in the optical axis direction S (see FIG. 1). ). FIG. 1 shows an example of an internal configuration of a shake correction apparatus that moves an image sensor in two directions orthogonal to the optical axis direction. The shake correction apparatus moves in two directions orthogonal to the optical axis direction. Is not limited to the configuration of FIG. In addition, the shake correction apparatus is not limited to the configuration in which the imaging element is moved in two directions orthogonal to the optical axis direction, and the lens may be configured to move in two directions orthogonal to the optical axis direction.

  A substrate 4 is disposed on the first slider 3, and a plurality of lenses (not shown) are disposed in front of the substrate 4 so as to be separated from each other in the optical axis direction. The substrate 4 incorporates an imaging element 4a such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor).

The first base plate 2 is fixed. The first base plate 2 is formed with a light transmission hole 2a penetrating in the front-rear direction.
For example, a fixing member 5 is attached to the lower surface of the rear surface of the first base plate 2.

  As shown in FIGS. 2 and 3, the fixing member 5 protrudes rearward from the base portion 6 facing in the front-rear direction, the shaft support portions 7 and 8 protruding rearward from the base portion 6, and the base portion 6, respectively. Each end portion is composed of side surface portions 9 and 9 connected to the shaft support portion 8. A space surrounded by the shaft support portion 8 and the side surface portions 9, 9 is formed as an arrangement space 5a. The fixing member 5 has a base portion 6 attached to the first base plate 2.

  The shaft support portions 7 and 8 are spaced apart from each other on the left and right, and have shaft support holes 7a and 8a, respectively.

  On the inner surface side of the side surface portions 9, 9, step surfaces 9a, 9a facing left are formed at positions close to the shaft support portion 8, respectively.

  A first actuator 10 is disposed and held on the fixing member 5. The first actuator 10 has a weight member 11, a piezoelectric element 12, and a drive shaft 13.

  The weight member 11 is formed in a block shape, for example.

  The piezoelectric element 12 is formed in a prismatic shape, and expands and contracts in the axial direction depending on a voltage application state. One end surface of the piezoelectric element 12 in the axial direction is fixed to the weight member 11 by, for example, adhesion.

  The drive shaft 13 is formed in a round shaft shape having a smaller diameter than the piezoelectric element 12. A second slider, which will be described later, is supported on the drive shaft 13.

  A first magnetic body 14 is fixed to the drive shaft 13 at one end in the axial direction. The first magnetic body 14 is made of a magnetic material such as a magnet or metal. For example, the outer shape is formed in a circular ring shape, and is fixed to the drive shaft 13 in an outer fitting shape by adhesion or press fitting.

  The second magnetic body 15 is arranged and fixed in the arrangement space 5 a of the fixing member 5. The second magnetic body 15 is made of a magnetic material such as a magnet or metal, and at least one of the first magnetic body 14 and the second magnetic body 15 is made of a magnet. The second magnetic body 15 has, for example, a rectangular outer shape, and has an insertion hole 15 a at the center, and the diameter of the insertion hole 15 a is larger than the outer diameter of the piezoelectric element 12. The second magnetic body 15 is inserted into the placement space 5a, and the outer peripheral portion of one surface is positioned by being pressed against the stepped surfaces 9a and 9a of the side surface portions 9 and 9, and is fixed to the fixing member 5 by adhesion or press fitting. .

  In the state where the first magnetic body 14 is fixed to one end portion in the axial direction of the drive shaft 13, the shaft insertion hole 8 a of the shaft support portion 8 and the shaft support hole 7 a of the shaft support portion 7 are sequentially arranged from the arrangement space 5 a side. It is inserted and supported by the shaft support portions 7 and 8 so as to be slidable in the axial direction. In a state where the drive shaft 13 is supported by the shaft support portions 7 and 8, the first magnetic body 14 is positioned in the vicinity of the shaft support portion 8 in the arrangement space 5a.

  The piezoelectric element 12 and the weight member 11 are inserted into the arrangement space 5 a of the fixing member 5, and the other end portion in the axial direction of the piezoelectric element 12 is inserted into the insertion hole 15 a of the second magnetic body 15. In a state where the piezoelectric element 12 is inserted through the insertion hole 15 a, a certain gap H <b> 1 is formed between the outer peripheral surface of the piezoelectric element 12 and the inner peripheral surface of the second magnetic body 15. The weight member 11 is fixed to the base portion 6 and the side surface portions 9, 9 with adhesives 16, 16,.

  In a state where the piezoelectric element 12 and the weight member 11 are arranged in the arrangement space 5a and the weight member 11 is fixed to the fixing member 5, the first magnetic body 14 is attracted by the magnetic force to the second magnetic body 15, and the drive shaft 13 is biased in a direction approaching the piezoelectric element 12, and one end surface 13 a of the drive shaft 13 is connected to the other end surface 12 a of the piezoelectric element 12 in surface contact. At this time, between the shaft support portion 8 of the fixing member 5 and the second magnetic body 15, the first is moved together when the drive shaft 13 moves in the axial direction as the piezoelectric element 12 expands and contracts. A sufficient distance H <b> 2 is secured so that the movement of the magnetic body 14 is not restricted by the shaft support portion 8 and the second magnetic body 15.

  On the rear surface of the first slider 3, for example, a fixing member 5 is attached to the left end portion. As shown in FIGS. 2 and 3, the fixing member 5 attached to the first slider 3 is attached to the first base plate 2 except that the base portion is shared with the first slider 3. Since the structure is the same as the fixed member 5 attached, detailed description is omitted.

  The fixing member 5 is attached to the first slider 3 in such a direction that the shaft support portions 7 and 8 are spaced apart from each other in the vertical direction.

  A second actuator 17 is disposed and held on the fixing member 5 attached to the first slider 3. Since the second actuator 17 has the same configuration as that of the first actuator 10, detailed description thereof is omitted. Unlike the first actuator 10, the second actuator 17 is arranged such that the axial direction of the drive shaft 13 is the vertical direction. Yes.

  A first magnetic body 14 is fixed to one end portion in the axial direction of the drive shaft 13 of the second actuator 17, and the second magnetic material is disposed in the arrangement space 5 a of the fixing member 5 attached to the first slider 3. The body 15 is arranged and fixed.

  A second slider 18 is disposed on the rear side of the first slider 3. The second slider 18 is formed in an L shape, and has support frame portions 18a and 18b at positions near the right end and positions near the upper end, respectively.

  Supports 19 and 19 are provided on the front surface of the second slider 18 at positions corresponding to the frame portions 18a and 18b, respectively. V-shaped support grooves 19a and 19b are formed in the support bodies 19 and 19 so as to extend left and right or up and down, respectively.

  The drive shafts 13 and 13 of the first actuator 10 and the second actuator 17 are slidably supported on the supports 19 and 19 while being pressed against the support grooves 19a and 19b, respectively. The drive shafts 13 and 13 are supported while being sandwiched between a pressing member (not shown) and the supports 19 and 19, and the pressing member is pressed against the supports 13 and 13 by a spring member (not shown). Each end portion of the pressing member is supported by being engaged with the frame portions 18a and 18b.

  In the shake correction apparatus 1 configured as described above, when the piezoelectric element 12 of the first actuator 10 is expanded and contracted by driving the first actuator 10, the drive shaft 13 is moved along with the expansion and contraction of the piezoelectric element 12. It is moved in the axial direction.

  At this time, when the drive shaft 13 is gently moved, the second slider 18 is moved together with the movement of the drive shaft 13 and attached to the first slider 3 and the first slider 3. The fixing member 5, the second actuator 17 supported by the second slider 18, and the substrate 4 supported by the first slider 3 are moved in the yaw direction (Y direction) shown in FIG. Therefore, the image sensor 4a assembled to the substrate 4 is moved in the yaw direction.

  In addition, when the drive shaft 13 is moved steeply, the second slider 18 slips with the movement of the drive shaft 13, and only the drive shaft 13 is moved, and the second slider 18 is not moved. Therefore, the image sensor 4a assembled to the substrate 4 is not moved.

  Such gentle movement and steep movement of the drive shaft 13 are continuously and repeatedly performed, so that the image pickup device 4a is moved in the yaw direction to a position where it is necessary to correct the shake.

  On the other hand, in the shake correction apparatus 1, when the piezoelectric element 12 of the second actuator 17 is expanded and contracted by driving the second actuator 17, the drive shaft 13 is moved in the axial direction along with the expansion and contraction of the piezoelectric element 12. The

  At this time, when the drive shaft 13 is gently moved, the first slider 3 is moved integrally with the movement of the drive shaft 13, and the substrate 4 is moved in the pitch direction (P direction) shown in FIG. The Therefore, the image sensor 4a assembled to the substrate 4 is moved in the pitch direction. At this time, the second slider 18 is not moved in the P direction because the drive shaft 13 extending to the left and right of the first actuator 10 is supported by the support 19.

  Further, when the drive shaft 13 is moved steeply, the first slider 3 slips with the movement of the drive shaft 13, and only the drive shaft 13 is moved, and the first slider 3 is not moved. Therefore, the image sensor 4a assembled to the substrate 4 is not moved. At this time, the second slider 18 is not moved in the P direction because the drive shaft 13 extending to the left and right of the first actuator 10 is supported by the support 19.

  Such gentle movement and steep movement of the drive shaft 13 are repeatedly performed in succession, whereby the image sensor 4a is moved in the pitch direction to a position where blurring is necessary.

  When the first actuator 10 and the second actuator 17 are assembled to the fixing members 5 and 5 and after the first actuator 10 and the second actuator 17 are assembled to the fixing members 5 and 5, There is a possibility that an external force is applied to the first actuator 10 or the second actuator 17 from a direction orthogonal to the axial direction of the drive shafts 13 and 13.

  At this time, the first magnetic body 14 is attracted to the second magnetic body 15 by magnetic force, and the one end surface 13a of the drive shaft 13 is connected to the other end surface 12a of the piezoelectric element 12 in surface contact with each other. Thus, the piezoelectric element 12 and the weight member 11 are displaced in a direction in which an external force is applied to the drive shaft 13 (see FIG. 4). Therefore, the piezoelectric element 12 is not bent with respect to the drive shaft 13, and damage to the piezoelectric element 12 can be prevented. At this time, the adhesives 16, 16,... Are elastically deformed with the displacement of the piezoelectric element 12 and the weight member 11 with respect to the drive shaft 13.

  When the external force applied to the first actuator 10 or the second actuator 17 is released, the piezoelectric element 12 and the weight member 11 return to their original positions by the elastic return of the adhesives 16, 16,.

  If the drive shaft 13 is detached from the piezoelectric element 12 in the axial direction by an external force, the first magnetic body 14 comes into contact with the shaft support portion 8 of the fixed member 5 and the shaft of the drive shaft 13 is moved. Movement in the direction is restricted (see FIG. 5). Thereafter, the first magnetic body 14 is attracted to the second magnetic body 15 by a magnetic force, and the drive shaft 13 is connected to the piezoelectric element 12 again.

  As described above, in the shake correction apparatus 1, the first magnetic body 14 is fixed to the drive shaft 13, the second magnetic body 15 is fixed to the fixing member 5, and the first magnetic body 14 and the first magnetic body 14 are fixed. At least one of the two magnetic bodies 15 is constituted by a magnet.

  Therefore, the configuration in which the drive shaft 13 is urged toward the piezoelectric element 12 can be realized by a simple mechanism, and the mechanism for preventing the piezoelectric element 12 from being damaged can be simplified.

  Further, the diameter of the insertion hole 15 a of the second magnetic body 15 is made larger than the outer diameter of the piezoelectric element 12, and a certain gap H <b> 1 is formed between the outer peripheral surface of the piezoelectric element 12 and the inner peripheral surface of the second magnetic body 15. Is forming. Therefore, when the piezoelectric element 12 is displaced in the direction perpendicular to the axial direction with respect to the drive shaft 13, it is possible to prevent the piezoelectric element 12 from contacting the second magnetic body 15. Can prevent scratches and damage.

  In addition, since magnetic materials, such as a metal used for the 1st magnetic body 14 or the 2nd magnetic body 15, are not formed by sintering like a magnet, generally it is possible to ensure a high processing precision. Therefore, when one of the first magnetic body 14 and the second magnetic body 15 is constituted by a magnet and the other is constituted by a magnetic material such as a metal, the first magnetic body 14 fixed to the drive shaft 13 is It is desirable that the first magnetic body 14 is made of a magnetic material such as metal to stabilize the fixed state of the first magnetic body 14 with respect to the drive shaft 13.

  In the above example, the fixing members 5 and 5 are attached to the first base plate 2 and the first slider 3, respectively. For example, the first base plate 2 and the fixing member 5 are integrally formed. Moreover, the 1st slider 3 and the fixing member 5 may be formed integrally.

  Moreover, although the example in which the weight member 11 is fixed to the fixing member 5 by the adhesives 16, 16,... Is shown above, the fixing means for the weight member is not limited to the adhesive. It is also possible to fix the weight member to the fixing member using a screw member as described below (see FIG. 6).

  A screw insertion hole 11 a is formed in the weight member 11.

  A screw insertion hole 6 a is formed in the base portion 6 of the fixing member 5. An elastically deformable plate-like buffer body 20 is disposed on the base portion 6, and an insertion hole 20 a is formed in the buffer body 20.

  A screw member 21 is disposed between the weight member 11 and the buffer body 20. The screw member 21 includes a plate-like base portion 22 and a cylindrical screw insertion portion 23 protruding from the center portion of the base portion 22. The inner surface of the screw insertion portion 23 is formed as a screw engagement portion 23 a having a screw groove. Has been.

  The base 22 of the screwing member 21 and the buffer body 20 are fixed by bonding or the like, and the buffer body 20 is fixed to the base portion 6 by bonding or the like. The screw insertion part 23 of the screwing member 21 is inserted into the insertion hole 20 a of the buffer body 20 and the screw insertion hole 6 a of the base part 6. A screw member 24 is inserted into the screw insertion hole 11 a of the weight member 11, the screw member 24 is screwed into a screwing portion 23 a of the screwing member 21, and the weight member 11 is connected to the fixing member 5 via the buffer body 20. It is fixed to the base part 6.

  The weight member 11 fixed to the fixing member 5 can be displaced within the deformation range of the buffer body 20.

<First Modification>
Next, a first modification will be described (see FIGS. 7 and 8).

  The actuator 25 according to the first modification shown below is different in the configuration of the first magnetic body and the second magnetic body compared to the first actuator 10 (second actuator 17) described above. The only difference is that. Therefore, in the following description of the first modified example, only the parts different from the first actuator 10 will be described in detail, and the other parts will be denoted by the same parts in the first actuator 10. The same reference numerals as those in FIG.

  An actuator 25 is disposed and held on the fixed member 5 (see FIG. 7). The actuator 25 has a weight member 11, a piezoelectric element 12, and a drive shaft 13.

  A first magnetic body 26 is arranged and fixed in the arrangement space 5 a of the fixing member 5. The first magnetic body 26 is composed of a magnet. The first magnetic body 26 has, for example, a rectangular outer shape, and has an insertion hole 26 a at the center. The diameter of the insertion hole 26 a is larger than the outer diameter of the drive shaft 13. The first magnetic body 26 is inserted into the placement space 5a, one surface is pressed against the shaft support portion 8, is positioned, and is fixed to the fixing member 5 by adhesion or press fitting.

  A second magnetic body 27 is fixed to the drive shaft 13 at one end in the axial direction. The second magnetic body 27 is composed of a magnet. The first magnetic body 26 and the second magnetic body 27 have the same polarity on the surfaces facing each other, and a repulsive force is generated between the first magnetic body 26 and the second magnetic body 27. Has been. The second magnetic body 27 is formed, for example, in a ring shape, and is fixed to the drive shaft 13 in an outer fitting shape by adhesion or press fitting.

  In a state where the piezoelectric element 12 and the weight member 11 are arranged in the arrangement space 5 a and the weight member 11 is fixed to the fixing member 5, the second magnetic body 27 is repelled by the magnetic force with respect to the first magnetic body 26. The drive shaft 13 is biased in a direction approaching the piezoelectric element 12, and the one end surface 13 a of the drive shaft 13 is in surface contact with and connected to the other end surface 12 a of the piezoelectric element 12. At this time, between the first magnetic body 26 and the second magnetic body 27, the second magnetic body that moves together when the drive shaft 13 moves in the axial direction as the piezoelectric element 12 expands and contracts. A sufficient distance H <b> 3 is secured so that the movement of the body 27 is not restricted by the first magnetic body 26.

  In the actuator 25, the second magnetic body 27 is repelled by the magnetic force with respect to the first magnetic body 26, and the one end surface 13 a of the drive shaft 13 is connected to the other end surface 12 a of the piezoelectric element 12. The weight member 11 is displaced in the direction in which the external force is applied to the drive shaft 13 (see FIG. 8). Therefore, the piezoelectric element 12 is not bent with respect to the drive shaft 13, and damage to the piezoelectric element 12 can be prevented.

  In the actuator 25, if the drive shaft 13 is detached from the piezoelectric element 12 in the axial direction due to an external force, the second magnetic body 27 comes into contact with the first magnetic body 26 and the shaft of the drive shaft 13. Movement in the direction is restricted. Thereafter, the second magnetic body 27 is repelled by the magnetic force with respect to the first magnetic body 26, and the drive shaft 13 is connected to the piezoelectric element 12 again.

  As described above, in the actuator 25, the second magnetic body 27 is fixed to the drive shaft 13, the first magnetic body 26 is fixed to the fixing member 5, and the second magnetic body 27 and the first magnetic body 27 are fixed. The magnetic body 26 is composed of a magnet.

  Therefore, the configuration in which the drive shaft 13 is urged toward the piezoelectric element 12 can be realized by a simple mechanism, and the mechanism for preventing the piezoelectric element 12 from being damaged can be simplified.

  In the actuator 25, the drive shaft 13 is inserted into the insertion hole 26 a of the first magnetic body 26, and the first magnetic body 26 and the second magnetic body 27 do not exist around the piezoelectric element 12. Therefore, when the piezoelectric element 12 is displaced in a direction orthogonal to the optical axis direction by an external force, the piezoelectric element 12 does not come into contact with other members, and the piezoelectric element 12 can be prevented from being damaged or damaged. .

<Second Modification>
Next, a second modification will be described (see FIG. 9).

  The actuator 28 according to the second modified example described below is different from the first actuator 10 (second actuator 17) described above in that the position of the second magnetic body is different and the configuration of the weight member. The only difference is that they are different. Therefore, in the following description of the second modified example, only the parts different from the first actuator 10 will be described in detail, and the other parts will be denoted by the same parts in the first actuator 10. The same reference numerals as those in FIG.

  An actuator 28 is disposed and held on the fixing member 5. The actuator 28 has a weight member 11 </ b> A, a piezoelectric element 12, and a drive shaft 13.

  The weight member 11A is provided with protective wall portions 11b and 11b that protrude from the other end surface in the direction in which the drive shaft 13 is located, and the protective wall portions 11b and 11b are spaced apart in the circumferential direction. Note that the number of the protective wall portions 11b is arbitrary as long as they are spaced apart in the circumferential direction, and the protective wall portions 11b may be formed in a cylindrical shape.

  A piezoelectric element 12 is disposed inside the protective wall portions 11b and 11b. The 2nd magnetic body 15 is being fixed to the front end surface of the protection wall parts 11b and 11b by adhesion | attachment etc.

  In the actuator 28, the first magnetic body 14 is attracted to the second magnetic body 15 by the magnetic force, and the one end surface 13 a of the drive shaft 13 is connected to the other end surface 12 a of the piezoelectric element 12. The member 11 is displaced in a direction in which an external force is applied to the drive shaft 13. Therefore, the piezoelectric element 12 is not bent with respect to the drive shaft 13, and damage to the piezoelectric element 12 can be prevented.

  In addition, since the piezoelectric element 12 is covered and protected from the surroundings by the protective wall portions 11b and 11b, when the piezoelectric element 12 is displaced in a direction perpendicular to the axial direction with respect to the drive shaft 13, the piezoelectric element 12 It is possible to prevent contact with other members, and it is possible to prevent the piezoelectric element 12 from being scratched or damaged.

<Third Modification>
Next, a third modification will be described (see FIGS. 10 to 12).

  The third modification shown below is a modification related to the fixing member, and the first magnetic body and the second magnetic body are arranged in the actuator arranged in the fixing member 5A according to the third modification. Not. Therefore, in the following description of the third modification, only the portions that are different from the fixing member 5 will be described in detail, and the other portions will be denoted by the same reference numerals as those assigned to similar portions in the fixing member 5. The description is omitted.

  An actuator 29 is disposed and held on the fixing member 5A. The actuator 29 includes a weight member 11, a piezoelectric element 12, and a drive shaft 13. The weight member 11 and the piezoelectric element 12 are fixed, and the piezoelectric element 12 and the drive shaft 13 are fixed.

  The side surface portions 9A and 9A of the fixing member 5A are connected by the top surface portion 30. The top surface portion 30 is provided, for example, in a state facing the base portion 6 at one end portion of the side surface portions 9A and 9A. Therefore, a portion of the arrangement space 5a where the top surface portion 30 is not provided is opened on the side opposite to the base portion 6, and this opened portion is formed as an opening 5b.

  The top surface portion 30 is preferably formed integrally with the side surface portions 9A and 9A. By forming the top surface portion 30 integrally with the side surface portions 9A and 9A, the number of parts can be reduced.

  The side portions 9A and 9A of the fixing member 5A are located close to the piezoelectric element 12 and the weight member 11, respectively. The portions 9b, 9b, 9c and 9c located on the side of the piezoelectric element 12 and the side of the weight member 11 are positioned. Yes.

  Since the fixing member 5A is provided with the top surface portion 30 as described above, when an external force in a direction orthogonal to the axial direction of the drive shaft 13 is applied to the actuator 29, the piezoelectric element 12 or the weight member 11 Displacement is regulated by the base portion 6, the side surface portions 9 </ b> A and 9 </ b> A, and the top surface portion 30, and damage to the piezoelectric element 12 can be prevented.

  Further, by providing the top surface portion 30, the weight member 11 can be bonded to the top surface portion 30 as well, stabilizing the weight member 11 in a fixed state and restricting the displacement of the weight member 11 toward the top surface portion 30 side. Can be planned.

  Further, since the opening 5b is formed in the fixing member 5A, the adhesives 16, 16,... For fixing the weight member 11 to the fixing member 5A can be confirmed from the opening 5b. The adhesion state by the agents 16, 16,... Can be confirmed, and forgetting adhesion can be prevented.

  It should be noted that a certain gap for applying the adhesives 16, 16,... Is necessary between the weight member 11 and each part such as the base portion 6, but like the fixing member 5B shown below, .. May be provided on a part of the inner surface of the base portion 6B, the side surface portions 9B and 9B, and the top surface portion 30B (see FIG. 12).

  By providing the protrusions 31, 31,..., A certain gap for applying the adhesive 16, 16,... Is secured, and then the base portion 6B, the side portions 9B, 9B, and the top surface portion 30B. And the weight member 11 can be shortened. Therefore, when an external force in a direction perpendicular to the axial direction of the drive shaft 13 is applied to the actuator 29, the displacement of the piezoelectric element 12 or the weight member 11 is restricted by the protrusions 31, 31,. Thus, the effect of preventing the damage of 12 can be enhanced.

[Imaging device]
Next, an example of an imaging device provided with a shake correction device will be described (see FIG. 13).

  The imaging apparatus 100 includes a camera main body unit 101 and a photographing lens unit 102.

  A camera block 110 is provided in the camera body 101.

  The camera block 110 includes a shake correction device 111, and the shake correction device 111 corresponds to the shake correction device 1 described above. The shake correction device 111 includes a first actuator 111a, a second actuator 111b, and an image sensor 111c.

  The first actuator 111a and the second actuator 111b correspond to the first actuator 10 and the second actuator 17, respectively. Further, the first actuator 111a and the second actuator 111b may be any of the actuators 25, 28, and 29 described above.

  For example, a CCD (Charge Coupled Device), a CMOS (Complementary Metal-Oxide Semiconductor), or the like is used as the imaging element 111c. The image signal of the subject captured by the photographing lens unit 102 is photoelectrically converted to obtain the image signal. It has a function to generate.

  The camera block 110 is provided with an actuator driving unit 112, and the first actuator 111 a and the second actuator 111 b are operated by a driving signal sent from the actuator driving unit 112.

  The camera block 110 is provided with a vibration sensor 113, an image sensor position sensor 114, and a shake control unit 115.

  The vibration sensor 113 is, for example, an angular velocity measurement sensor, detects the angular velocity of the camera body 101 when camera shake or image blur occurs, and sends the measured angular velocity to the blur control unit 115 as a detection signal.

  The image sensor position sensor 114 detects a change in magnetic flux by a Hall element or the like based on the position of the image sensor 111c, and sends a detection signal generated based on the detection result to the shake controller 115.

  The shake controller 115 generates a control signal based on the detection signals input from the vibration sensor 113 and the image sensor position sensor 114 and sends the control signal to the actuator driver 112.

  The camera body unit 101 is provided with a camera control unit 116. The camera control unit 116 includes a CPU (Central Processing Unit) 116a, a ROM (Read Only Memory) 116b, and a RAM (Random Access Memory) 116c.

  The CPU 116a is responsible for overall control of the imaging apparatus 100, and for example, exchanges signals with the shake control unit 115.

  The ROM 116b stores various programs executed by the CPU 116a, data necessary for each process, and the like.

  The RAM 116c is mainly used as a work area for temporarily storing intermediate results of processing.

  The camera body 101 is provided with a shutter button 117, an operation unit 118, and a display unit 119.

  When the shutter button 117 is operated, an operation signal is sent to the camera control unit 116, and the image signal of the subject is captured by the photographing lens unit 102.

  The operation unit 118 is various touch panels, control keys, and the like provided in the imaging apparatus 100. When an operation on the operation unit 118 is performed, a signal corresponding to the operation is input to the CPU 116a, and a command signal is sent from the CPU 116a to each unit based on the input signal.

  The display unit 119 is a liquid crystal panel, for example, and is controlled by the camera control unit 116. Various kinds of information such as image data are displayed on the display unit 119.

  The taking lens unit 102 includes a lens block 120, and the lens block 120 includes a plurality of lenses 121, 121,. The image signal of the subject is taken into the image sensor 111c via the lenses 121, 121,.

  Since the imaging apparatus 100 includes the blur correction device 111 (blur correction device 1) configured as described above, the piezoelectric when an external force is applied to the first actuator 111a and the second actuator 111b. Damage to the element can be prevented.

  The specific shapes and structures of the respective parts shown in the above-described best mode are merely examples of the implementation of the present invention, and the technical scope of the present invention is limited by these. It should not be interpreted in a general way.

2 to 12 show an embodiment of a shake correction apparatus of the present invention, and this figure is an exploded perspective view. It is an enlarged side view showing a part in cross section. It is an enlarged plan view showing a part in cross section. It is an enlarged side view which shows the state which the piezoelectric element and the weight member displaced with respect to the drive shaft in a part cross section. FIG. 4 is an enlarged plan view showing a state in which a drive shaft is detached from a piezoelectric element, with a part in cross section. It is an enlarged side view which shows the example by which the weight member was fixed to the fixing member with the screw member in a cross section. FIG. 8 shows a first modification example, and FIG. 8 is an enlarged plan view showing a part thereof in cross section. It is an enlarged side view which shows the state which the piezoelectric element and the weight member displaced with respect to the drive shaft in a part cross section. It is an enlarged plan view which shows a 2nd modification in part in cross section. FIG. 11 and FIG. 12 show a third modification, and this figure is an enlarged plan view showing a part thereof in cross section. It is an enlarged side view showing a part in cross section. It is an expanded sectional view which shows the example which provided the protrusion in the inner surface of each surface part of a fixing member. It is a block diagram which shows an example of an imaging device.

DESCRIPTION OF SYMBOLS 1 ... Shake correction apparatus, 4a ... Image pick-up element, 5 ... Fixing member, 6 ... Base part, 7 ... Shaft support part, 7a ... Shaft support hole, 8 ... Shaft support part, 8a ... Shaft support hole, 10 ... 1st Actuator, 11 ... weight member, 12 ... piezoelectric element, 12a ... other end surface, 13 ... drive shaft, 13a ... one end surface, 14 ... first magnetic body, 15 ... second magnetic body, 15a ... insertion hole, 17 ... 2nd actuator, 25 ... Actuator, 26 ... 1st magnetic body, 27 ... 2nd magnetic body, 28 ... Actuator, 11A ... Weight member, 11b ... Protection wall part, 100 ... Imaging device, 111 ... Shake correction device 111a ... first actuator, 111b ... second actuator, 111c ... imaging device, 121 ... lens

Claims (6)

A pair of actuators for moving the lens or the image sensor in two directions orthogonal to the optical axis direction and orthogonal to each other;
A pair of fixing members each having a base portion and a pair of shaft support portions projecting from the base portion and having shaft support holes formed therein;
The actuator is
A weight member fixed to the fixing member;
A piezoelectric element that is expanded and contracted in accordance with an applied voltage and has one end surface in the expansion and contraction direction fixed to the weight member;
The shaft is supported by the pair of shaft support holes of the fixing member so as to be slidable in the axial direction, and one end surface in the axial direction is connected to the other end surface in the expansion / contraction direction of the piezoelectric element. A drive shaft moved in the direction,
A first magnetic body and a second magnetic body that urge the drive shaft toward the piezoelectric element by magnetic force to connect the one end surface of the drive shaft in the axial direction to the other end surface of the piezoelectric element in the expansion / contraction direction. Provide a magnetic body,
The first magnetic body and the second magnetic body are disposed apart from each other in the axial direction, and are disposed on the piezoelectric element side from a shaft support portion located on the piezoelectric element side of the fixing member,
One of the first magnetic body and the second magnetic body is fixed to the drive shaft, and the other is fixed to the fixing member or the weight member. Fixing the first magnetic body to the drive shaft;
The second magnetic body is disposed closer to the piezoelectric element than the first magnetic body and fixed to the fixing member,
At least one of the first magnetic body and the second magnetic body is constituted by a magnet,
The shake correction apparatus according to claim 1, wherein the first magnetic body is attracted toward the second magnetic body and the drive shaft is biased toward the piezoelectric element. Forming the second magnetic body into an annular shape having an insertion hole;
Inserting the piezoelectric element through the insertion hole of the second magnetic body;
The shake correction apparatus according to claim 2, wherein an outer diameter of the piezoelectric element is smaller than a diameter of the insertion hole. The first magnetic body is disposed on the drive shaft side and fixed to the fixing member,
The second magnetic body is disposed on the piezoelectric element side and fixed to the drive shaft,
Both the first magnetic body and the second magnetic body are constituted by magnets,
The shake correction apparatus according to claim 1, wherein the second magnetic body is repelled toward the piezoelectric element with respect to the first magnetic body, and the drive shaft is biased toward the piezoelectric element. The weight member is provided with a protective wall portion that covers at least a part of the piezoelectric element from the outer peripheral side,
Fixing the first magnetic body to the drive shaft;
The second magnetic body is disposed closer to the piezoelectric element than the first magnetic body and fixed to the distal end surface of the protective wall portion of the weight member,
At least one of the first magnetic body and the second magnetic body is constituted by a magnet,
The shake correction apparatus according to claim 1, wherein the first magnetic body is attracted toward the second magnetic body and the drive shaft is biased toward the piezoelectric element. A shake correction device that corrects the shake by moving the lens or the image sensor in a direction orthogonal to the optical axis direction,
The blur correction device is
A pair of actuators that respectively move the lens or the image sensor in two directions orthogonal to the optical axis and orthogonal to each other;
A pair of fixing members each having a base portion and a pair of shaft support portions projecting from the base portion and having shaft support holes formed therein;
The actuator is
A weight member fixed to the fixing member;
A piezoelectric element that is expanded and contracted in accordance with an applied voltage and has one end surface in the expansion and contraction direction fixed to the weight member;
The shaft is supported by the pair of shaft support holes of the fixing member so as to be slidable in the axial direction, and one end surface in the axial direction is connected to the other end surface in the expansion / contraction direction of the piezoelectric element. A drive shaft moved in the direction,
A first magnetic body and a second magnetic body that urge the drive shaft toward the piezoelectric element by magnetic force to connect the one end surface of the drive shaft in the axial direction to the other end surface of the piezoelectric element in the expansion / contraction direction. Provide a magnetic body,
The first magnetic body and the second magnetic body are arranged apart from each other in the axial direction and are arranged on the piezoelectric element side from a shaft support portion located on the piezoelectric element side of the fixing member,
One of the first magnetic body and the second magnetic body is fixed to the drive shaft, and the other is fixed to the fixing member or the weight member.

Images