JP2008225349A - Imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging apparatus capable of performing appropriate blurring correction by making the movement of a moving member moving for blurring correction smooth. <P>SOLUTION: The imaging apparatus is constituted by providing a first support shaft 12 supporting a first moving member 11 movably in a first direction X. Thus, the movement of the first moving member 11 is made smoother than when the first moving member 11 is supported only by the driving shaft 8a of a first actuator 8. The first support shaft 12 is inserted and assembled in a groove 13a formed on an imaging device holder 13 in a movable state. Thus, even if the attaching position of the first member 11 is deviated, the arranging position or arranging posture of the first support shaft 12 is adjusted according to the deviation, and the first moving member 11 is surely supported in such a state that it is smoothly moved by the first support shaft 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an imaging apparatus that performs camera shake correction.

2. Description of the Related Art Conventionally, as an imaging apparatus that performs camera shake correction, a first slider that moves in the X-axis direction by driving a first actuator relative to a base member, and a first slider that moves in the Y-axis direction by driving a second actuator relative to the first slider. 2. Description of the Related Art There are known two sliders that perform camera shake correction by moving an image sensor attached to a second slider according to the state of camera shake (for example, Patent Documents 1 and 2).
JP 2005-309209 A JP 2005-333181 A

  However, in such an apparatus, there is a possibility that appropriate camera shake correction cannot be performed. For example, if an attempt is made to support the first slider with only the rod member of the first actuator, the support state becomes unstable, the first slider does not move smoothly, and the apparatus cannot be driven efficiently.

  On the other hand, it can be considered that the first slider is supported by the guide shaft to stabilize the support state, and the first slider can be moved smoothly. However, smooth movement is not always easy even if the first slider is positioned and moved by the guide shaft. That is, the first slider moves together with the image pickup device or the image pickup optical system, and the image pickup device or the image pickup optical system is installed on the basis of the optical axis. Therefore, the position of the first slider is also determined accordingly. End up. At this time, if the first slider is not accurately arranged due to a manufacturing error or the like, a positional deviation between the first slider and the guide shaft occurs, and the first slider does not move smoothly along the guide shaft. As a result, appropriate camera shake correction cannot be performed.

  Therefore, the present invention has been made to solve such a technical problem, and an object of the present invention is to provide an imaging apparatus capable of facilitating the movement of a moving member that moves for camera shake correction.

  That is, an imaging apparatus according to the present invention includes an imaging optical system and an imaging element that converts an image formed by the imaging optical system into an electrical signal, and one of the imaging optical system and the imaging element is in an optical axis direction. In an imaging apparatus that performs camera shake correction by moving in the first moving direction and the second moving direction orthogonal to each other, the drive shaft is reciprocated by the expansion and contraction of the piezoelectric element and the base member to which one of the imaging optical system and the imaging element is attached. A first actuator that is moved and driven; a first moving member that is frictionally engaged with a drive shaft of the first actuator and moves in the first movement direction relative to the base member by driving of the first actuator; The first moving member is arranged in the first moving direction, and is inserted and assembled in a groove or hole formed in the base member in a state with play. A first support shaft that is movably supported, and a second moving member that is attached to the other of the imaging optical system and the imaging element and moves in the second moving direction relative to the first member by driving a second actuator. It is prepared for.

  According to the present invention, by providing the first support shaft that supports the first moving member so as to be movable in the first moving direction, the first moving member is supported by the drive shaft of the first actuator compared to the case where the first moving member is supported. The movement of the moving member can be made smooth. In addition, when the first support shaft is inserted and assembled in a groove or hole formed in the base member in a state with play, the first support shaft is adjusted accordingly when the mounting position of the first moving member is shifted. The arrangement position or the arrangement posture can be adjusted. For this reason, the first moving member can be supported by the first support shaft in a smoothly moving state, and the first moving member can be moved smoothly.

  The imaging device according to the present invention is suitable for a camera built in a mobile phone. When the imaging device is built in a mobile phone, it is small, and thus a slight shift in the mounting position or mounting posture of the first actuator is likely to occur. According to the present invention, since the installation position of the first support shaft can be adjusted according to such a shift, the first moving member can be supported so as to be smoothly movable.

  According to the present invention, by moving a moving member that moves for camera shake correction using the support shaft, the moving member can be smoothly moved.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is an exploded perspective view of an imaging unit and a camera shake correction mechanism in an imaging apparatus according to an embodiment of the present invention. FIG. 2 is a plan view of the imaging unit and the camera shake correction mechanism of the imaging apparatus according to the present embodiment. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG.

  The image pickup apparatus according to the present embodiment performs camera shake correction by relatively moving the image pickup optical system and the image pickup element in a direction orthogonal to the optical axis direction. That is, the camera shake is corrected by moving the imaging optical system in accordance with the camera shake and changing the relative position with the image sensor. This imaging apparatus is applied to a camera that captures still images, a video camera that captures moving images, an imaging unit mounted on a mobile phone, and the like.

  First, the mechanical configuration of the imaging apparatus according to the present embodiment will be described. As illustrated in FIG. 1, the imaging apparatus according to the present embodiment includes an imaging optical system 2 and an imaging element 14 for acquiring an image of a subject. The imaging optical system 2 is an optical system that focuses light on the imaging device 14 and includes a photographic lens. The imaging optical system 2 is configured by accommodating a lens (not shown) in a holder 2a, for example. The imaging optical system 2 may be composed of a single lens or a lens group composed of a plurality of lenses.

  The imaging optical system 2 is attached to the second moving member 5 and is provided so as to be relatively movable with respect to the imaging element 14 in a direction orthogonal to the direction of the optical axis O (optical axis direction). The second moving member 5 is housed in the image sensor holder 13 that fixes the image sensor 14 and is supported by the sphere 4 so that the second moving member 5 moves relative to the image sensor holder 13 and the image sensor 14 in a direction perpendicular to the optical axis direction. It is possible. For this reason, the imaging optical system 2 moves relative to the imaging element 14 in a direction orthogonal to the optical axis direction when the imaging optical system 2 moves together with the second moving member 5.

  At this time, it is preferable that the imaging optical system 2 is attached to the second moving member 5 so as to be movable in the optical axis direction. For example, the support shaft 3 facing the optical axis direction is attached to the second moving member 5, and the imaging optical system 2 is attached so as to be movable along the support shaft 3. As the actuator 10 that moves the imaging optical system 2 in the optical axis direction, an actuator that includes a drive shaft 10b that reciprocates by expansion and contraction of the piezoelectric element 10a is used. The actuator 10 functions as a third actuator that moves the imaging optical system 2 in the optical axis direction. The piezoelectric element 10a is attached to the second moving member 5, and the drive shaft 10b is frictionally engaged with the imaging optical system 2 by the friction engagement portion 22 (see FIG. 4). One end of the drive shaft 10b is in contact with the piezoelectric element 10a and is bonded using, for example, an adhesive. The drive shaft 10b is a long member, for example, a cylindrical member.

  As the friction engagement structure, for example, a structure in which the drive shaft 10b is pressed against the holder 2a of the imaging optical system 2 with a constant pressing force by a plate spring, and a constant friction force is generated when the drive shaft 10b moves. And By moving the drive shaft 10b so as to exceed this frictional force, the position of the imaging optical system 2 is maintained by inertia. On the other hand, when the drive shaft 10b moves in the reverse direction so as not to exceed the frictional force, the imaging optical system 2 also moves in the reverse direction. By repeating such reciprocating movement of the drive shaft 10b, the imaging optical system 2 can be moved relative to the second moving member 5. An electric signal for making the extension speed and the contraction speed different from each other is input to the piezoelectric element 10a from a control unit (not shown). Thereby, the drive shaft 10b reciprocates at different speeds, and the movement control of the imaging optical system 2 can be performed.

  Thus, by attaching the imaging optical system 2 to the second moving member 5 so as to be movable in the optical axis direction, only the imaging optical system 2 is moved in the optical axis direction with respect to the second moving member 5 to perform zooming or focusing. It can be performed. For this reason, it is not necessary to perform zooming or focusing by moving the entire camera shake correction mechanism. Accordingly, since the parts that move by zooming or focusing are reduced, the camera shake correction mechanism can be made smaller.

  The image pickup device 14 is an image pickup unit that converts an image formed by the photographing optical system 2 into an electric signal, and is fixedly attached to the image pickup device holder 13. For example, a CCD sensor is used as the image sensor 14. The imaging element holder 13 is fixed in the imaging apparatus and functions as a base member for assembling the camera shake correction mechanism.

  The imaging apparatus according to the present embodiment includes a first actuator 8, a second actuator 6, and a first moving member 11. The first actuator 8 is an actuator that relatively moves the imaging optical system 2 and the imaging element 14 in a first direction (pitch direction) X orthogonal to the optical axis direction. As the first actuator 8, for example, an actuator having a drive shaft 8b that reciprocates by expansion and contraction of the piezoelectric element 8a is used. The drive shaft 8b is disposed toward the first direction X. The piezoelectric element 8a is attached to the image sensor holder 13 to which the image sensor 14 is fixed. The drive shaft 8b is frictionally engaged with the first moving member 11 by the friction engagement portion 21 (see FIG. 4). One end of the drive shaft 8b is in contact with the piezoelectric element 8a and is bonded using, for example, an adhesive. The drive shaft 8b is a long member, for example, a cylindrical member.

  As the friction engagement structure, for example, the drive shaft 8b is pressed against the first moving member 11 with a constant pressing force by a plate spring, and a constant friction force is generated when the drive shaft 8b moves. To do. When the drive shaft 8b moves so as to exceed this frictional force, the position of the first moving member 11 is maintained by inertia. On the other hand, when the drive shaft 8b moves in the opposite direction so as not to exceed the frictional force, the first moving member 11 also moves in the opposite direction. By repeating such reciprocating movement of the drive shaft 8b, the first moving member 11 can be moved along the first direction X with respect to the image pickup device 14, and the image pickup optical system 2 can be moved relative to the image pickup device 14. Can be moved in the first direction X. The piezoelectric element 8a receives an electrical signal from the control unit (not shown) that makes its expansion speed and contraction speed different. Thereby, the drive shaft 8b can reciprocate at different speeds, and the movement control of the imaging optical system 2 can be performed.

  The first actuator 8 may be configured by attaching the piezoelectric element 8 a to the first moving member 11 side and frictionally engaging the drive shaft 8 b with the imaging element holder 13.

  The second actuator 6 is an actuator that relatively moves the imaging optical system 2 and the imaging element 14 in a second direction (yaw direction) Y orthogonal to the optical axis direction. The second actuator 6 and the first actuator 8 function as driving means for moving the imaging optical system 2 and the imaging element 14 relative to each other.

  The second direction Y is a direction orthogonal to the optical axis direction and intersecting the first direction X. For example, the second direction Y is set to a direction orthogonal to the first direction X. As this second actuator 6, for example, an actuator provided with a drive shaft 6b that reciprocates by expansion and contraction of the piezoelectric element 6a is used. The drive shaft 6b is disposed toward the second direction Y. The piezoelectric element 6 a is attached to the second moving member 5. The drive shaft 6b is frictionally engaged with the first moving member 11 by the friction engagement portion 20 (see FIG. 2). One end of the drive shaft 6b is in contact with the piezoelectric element 6a and is bonded using, for example, an adhesive. The drive shaft 6b is a long member, and for example, a cylindrical member is used.

  As the friction engagement structure, for example, the drive shaft 6b is pressed against the first moving member 11 with a constant pressing force by a plate spring, and a constant friction force is generated when the drive shaft 6b moves. To do. When the drive shaft 6b moves in one direction so as to exceed this frictional force, the position of the second moving member 5 is maintained by inertia. On the other hand, if the drive shaft 6b tries to move in the opposite direction so as not to exceed the frictional force, the second moving member 5 moves in one direction while the drive shaft 6b remains stationary by the frictional force. By repeating such reciprocating movement of the drive shaft 6b, the second moving member 5 can be moved along the second direction Y with respect to the image pickup device 14, and the image pickup optical system 2 can be relatively moved with respect to the image pickup device 14. Can be moved in the second direction Y. The piezoelectric element 6a receives an electrical signal from the control unit (not shown) that makes the extension speed and the contraction speed different. Thereby, the drive shaft 6b reciprocates at different speeds, and the movement control of the imaging optical system 2 can be performed.

  The second actuator 6 is attached to the first moving member 11 by the friction engagement described above. For this reason, when the first moving member 11 moves in the first direction X by the operation of the first actuator 8, the second actuator 6 also moves in the first direction X.

  The second actuator 6 may be configured by attaching the piezoelectric element 6 a to the first moving member 11 side and frictionally engaging the drive shaft 6 b with the second moving member 5.

  The imaging device is provided with a position detection magnet 9 and a Hall element 15. The position detection magnet 9 is a magnet attached to the second moving member 5, and may be any one that generates a magnetic field that can be detected by the Hall element 15. The Hall element 15 is a magnetic sensor that detects the relative position of the imaging element 14 and the imaging optical system 2 with respect to the direction orthogonal to the optical axis direction based on the state of the magnetic field generated from the position detection magnet 9. Attached to. The board | substrate 17 is a wiring board attached to the image pick-up element holder 13, and is bent and used for L shape, for example. The lead wires of the piezoelectric elements 6a, 8a and 10a are attached to the substrate 17 respectively.

  A photo interrupter 16 is provided in the imaging apparatus. The photo interrupter 16 is a position detection sensor that detects the position of the imaging optical system 2. The photo interrupter 16 is attached to the substrate 17 and is disposed in the vicinity of the imaging optical system 2. The photo interrupter 16 includes a light emitting unit and a light receiving unit, and detects the position of the imaging optical system 2 in the optical axis direction through position detection of the moving piece 2b passing between the light emitting unit and the light receiving unit. The moving piece 2 b is a member that is formed in the holder 2 a of the imaging optical system 2 and moves together with the imaging optical system 2.

  The imaging apparatus includes an upper cover 1. The upper cover 1 is a cover that covers the opening of the image sensor holder 13 that houses the image pickup unit and the camera shake correction mechanism, and forms an opening 1a for entering a subject image.

  As shown in FIG. 2, the first moving member 11 is supported by the first support shaft 12 so as to be movable along the first direction X. The first support shaft 12 is a shaft member disposed in the first direction X, and is attached to the image sensor holder 13. The first support shaft 12 is provided through the bearing portion 11 a of the first moving member 11. Accordingly, the first moving member 11 is supported by the first support shaft 12 so as to move only in the first direction X with respect to the imaging element 14.

  The first support shaft 12 is disposed on the first actuator 8 side with respect to the imaging optical system 2. That is, the first support shaft 12 is not disposed on the opposite side of the first actuator 8 with the imaging optical system 2 interposed therebetween, but is disposed on the first actuator 8 side. For this reason, the movement mechanism by the first actuator 8 and the support mechanism by the first support shaft 12 can be integrated into a compact configuration.

  The second moving member 5 is supported by the second support shaft 7 so as to be movable along the second direction Y. The second support shaft 7 is a shaft member arranged in the second direction Y, and is attached to the second moving member 5. The second support shaft 7 is provided through the bearing portion 11 b of the first moving member 11. Thus, the second moving member 5 is supported by the second support shaft 7 so as to move only in the second direction Y with respect to the first moving member 11.

  The second support shaft 7 is disposed on the second actuator 6 side with respect to the imaging optical system 2. That is, the second support shaft 7 is not disposed on the opposite side of the second actuator 6 across the imaging optical system 2 but is disposed on the second actuator 6 side. For this reason, the movement mechanism by the 2nd actuator 6 and the support mechanism by the 2nd support shaft 7 can be put together, and can be comprised compactly.

  The first actuator 8 and the second actuator 6 are preferably arranged in a T shape. The first actuator 8 and the second actuator 6 are installed so as to be combined in a T shape with the other tip portion facing one intermediate portion. For example, the first actuator 8 is combined in a T shape with the tip portion of the second actuator 6 facing the intermediate portion.

  Thereby, the drive shafts 8b and 6b of the first actuator 8 and the second actuator 6 can be arranged close to each other. For this reason, the 1st moving member 11 engaged with both the drive shaft 8b and the drive shaft 6b can be comprised small. Accordingly, it is possible to reduce the size of the imaging device.

  Here, the T-shape includes not only the case where the first actuator 8 and the second actuator 6 are combined in a perfect T shape but also the case where they are combined in a substantially T shape. For example, when the other tip portion is directed to one intermediate portion of the first actuator 8 and the second actuator 6, there is a predetermined space between the intermediate portion and the tip portion, or from the center of the intermediate portion. It may be the case where the tip portion is directed to a position that is out of place. Even in these cases, the first moving member 11 that engages with both the drive shaft 8b and the drive shaft 6b can be configured to be small, and the imaging apparatus can be downsized.

  FIG. 5 is an end view taken along the line V-V of the imaging apparatus of FIG.

  As shown in FIG. 5, the first support shaft 12 is inserted and assembled in a groove 13 a formed in the image sensor holder 13. The groove 13a is a long groove that is long in the direction of the optical axis O, and is formed so that the first support shaft 12 can be inserted in a state where there is play along the optical axis direction. The first support shaft 12 is preferably fixed to the image sensor holder 13 with an adhesive or the like while being inserted into the groove 13a. In FIG. 5, only one end portion of the first support shaft 12 is illustrated, but the other end portion may be similarly inserted into the long groove and attached.

  The groove 13a for inserting the first support shaft 12 may be a groove or a hole formed in a shape other than the long groove shape as long as it can be inserted at least in the state of play in the optical axis direction. For example, a hole 13b formed larger than the outer diameter of the first support shaft 12 as shown in FIG. 6 may be used, or an oval hole 14c may be used as shown in FIG. In addition, the code | symbol 13f in FIG. 6, 7 is an adhesive agent.

  As described above, the first support shaft 12 is assembled with being inserted into the groove 13a or the like in a state where there is play with respect to the image sensor holder 13, so that the position of the first support shaft 12 is adjusted and the image sensor holder is adjusted. 13 and can support the 1st moving member 11 in the state which can move smoothly.

  For example, as shown in FIG. 1, when assembling each component to the image sensor holder 13, the arrangement position of the second moving member 5 is first determined with respect to the image sensor holder 13 via the sphere 4. The arrangement position of the first moving member 11 is determined with respect to the second moving member 5 via the second actuator 6 and the second support shaft 7. At that time, the arrangement position of the first moving member 11 may be shifted from the design position due to manufacturing errors of the second moving member 5 and the second actuator 6. In such a case, after the first support shaft 12 is inserted through the first moving member 11 and the position of the first support shaft 12 is determined according to the arrangement position of the first moving member 11, the first support shaft 12 is imaged. It adheres to the groove 13a of the element holder 13 with an adhesive or the like. Thereby, the 1st moving member 11 and the 1st support shaft 12 can be combined appropriately, and the 1st moving member can be supported in the state moved smoothly by the 1st support shaft.

  Further, as shown in FIG. 3, in the frictional engagement portion 21 between the first moving member 11 and the drive shaft 8a of the first actuator 8, a planar portion 11d formed in parallel to the optical axis direction of the first moving member 11. It is preferable that the drive shaft 8a is brought into contact with and frictionally engaged. In this case, even when the arrangement positions of the first moving member 11 and the first actuator 8 are shifted in the optical axis direction when assembling each component to the image sensor holder 13, the drive shaft is moved with respect to the first moving member 11. 8a can be contacted without difficulty and appropriate frictional engagement can be achieved. Therefore, the drive by the first actuator 8 can be performed appropriately.

  FIG. 8 is a block diagram illustrating an electrical configuration of the imaging apparatus according to the present embodiment. FIG. 9 is a schematic diagram of a camera shake correction circuit in the imaging apparatus according to the present embodiment.

  As shown in FIG. 8, the imaging apparatus according to the present embodiment includes a first control unit 30, a gyro sensor 50, and a second control unit 40. The first control unit 30 functions as a control unit that controls the relative movement of the image pickup optical system 2 and the image pickup element 14 in the direction orthogonal to the optical axis direction to perform camera shake correction. The first control unit 30 is configured by, for example, an LSI (Large Scale Integration) incorporating a CPU and a driver chip. The gyro sensor 50 functions as a camera shake detection sensor that detects the amount of camera shake. The gyro sensor 50 is disposed outside the image stabilization unit, that is, outside the image sensor holder 13. The first control unit 30 inputs the detection signal X of the gyro sensor 50 and the detection signal B of the hall element 15, outputs the drive control signal Y 1 to the first actuator 8, and outputs the drive control signal Y 2 to the second actuator 6. To do.

  For example, as shown in FIG. 9, a camera shake correction circuit using a differential amplifier 31 is provided in the first control unit 30. This camera shake correction circuit outputs drive control signals Sx and Sy to the first actuator 8 and the second actuator 6 in accordance with the difference between the detection signal S1 of the gyro sensor 50 and the detection signal S2 of the Hall element 15. The detection signal S1 of the gyro sensor 50 is a signal indicating the amount of camera shake of the imaging device, and the detection signal S2 of the Hall element 15 indicates the relative movement amount in the direction orthogonal to the optical axis direction of the imaging optical system 2 and the imaging device 14. Signal. For this reason, camera shake correction is performed by reducing the difference between the amount of camera shake and the relative movement amount of the imaging optical system 2 and the image sensor 14.

  The detection signal S <b> 1 of the gyro sensor 50 is preferably integrated by the integration circuit 32 and input to the differential amplifier 31. Further, the detection signal S2 of the Hall element 15 is preferably input to the differential amplifier 31 after being amplified by the amplifier circuit 33. In the first control unit 30, a camera shake correction circuit that generates a drive control signal Sx output to the first actuator 8 side and a camera shake correction circuit that generates a drive control signal Sy output to the second actuator 6 side are provided. Provided.

  In FIG. 8, the second control unit 40 functions as a control unit that controls movement of the imaging optical system 2 in the optical axis direction. The second control unit 40 is configured by, for example, an autofocus IC or a microcomputer. The second control unit 40 acquires distance information to the subject using a distance measuring device (not shown), and outputs a drive control signal to the actuator 10 based on the distance information and a detection signal of the photo interrupter 16, Move control.

  FIG. 10 shows an example of signal waveforms input to the first actuator 8 and the second actuator 6.

  FIG. 10A shows a signal (a signal during forward rotation) input when the member to be frictionally engaged is moved in a direction to approach the piezoelectric elements 6a and 8a, and FIG. It is a signal (a signal at the time of reverse rotation) input when the member to be engaged is moved in a direction away from the piezoelectric elements 6a and 8a. 10A and 10B, the two pulse signals are signals input to the two terminals of the piezoelectric elements 6a and 8a. The greater the voltage difference between these pulse signals, the greater the amount of expansion of the piezoelectric elements 6a, 8a. The fluctuation of the voltage difference causes the piezoelectric elements 6a, 8a to expand and contract.

  These signals in FIGS. 10A and 10B are signals when the first actuator 8 and the second actuator 6 are driven. Continuous driving is performed when signals for each pulse are continuously input to the first actuator 8 and the second actuator 6.

  On the other hand, the signal when the first actuator 8 and the second actuator 6 are at rest is a signal in which the voltage difference inputted to the two terminals of the piezoelectric elements 6a and 8a becomes zero, although not shown. In addition, the resting input signal in which the voltage difference becomes zero is a signal in which the voltage difference becomes zero in a long time longer than one pulse cycle time in the driving input signal shown in FIGS. 10 (A) and 10 (B). It is preferable to do.

  The signals input to the first actuator 8 and the second actuator 6 are not limited to those shown in FIG. 10, but may be a sawtooth wave signal or a triangular wave signal instead of a pulse signal.

  Next, an operation at the time of camera shake correction in the imaging apparatus according to the present embodiment will be described.

  In FIG. 8, when camera shake occurs when shooting using the imaging device, the gyro sensor 50 detects the camera shake amount and outputs a camera shake detection signal S <b> 1 to the first control unit 30. The first control unit 30 drives the first actuator 8 and the second actuator 6 so that the image picked up by the image pickup device 14 is not blurred based on the detection signal S1 of the gyro sensor 50 and the detection signal S2 of the hall element 15. Output a control signal.

  The first actuator 8 and the second actuator 6 are driven according to this drive control signal. That is, the first actuator 8 and the second actuator 6 operate so that the extension speed and the contraction speed of the piezoelectric elements 8a and 6a are different, and the drive shafts 8b and 6b repeatedly reciprocate. The first moving member 11 moves in the first direction X with respect to the imaging element 14 by driving the first actuator 8, and the imaging optical system together with the second moving member 5 with respect to the first moving member 11 by driving the second actuator 6. 2 moves in the second direction Y, and the image sensor 14 and the imaging optical system 2 move relatively.

  Thereby, even if camera shake occurs in the imaging apparatus, the imaging device 14 and the imaging optical system 2 are relatively moved and controlled, and the camera shake of the captured image of the imaging device 14 is suppressed.

  As described above, according to the imaging apparatus according to the present embodiment, by providing the first support shaft 12 that supports the first moving member 11 so as to be movable in the first direction X, the drive shaft 8a of the first actuator 8 is provided. Only when the first moving member 11 is supported, the first moving member 11 can be moved smoothly.

  Further, when the first support shaft 12 is inserted and assembled in a groove 13a formed in the image sensor holder 13 with play, the first moving member 11 is attached to the first moving shaft 11 in a shifted manner. The arrangement position or arrangement posture of the support shaft 12 can be adjusted. For this reason, the 1st moving member 11 can be reliably supported in the state which moves smoothly by the 1st support shaft 12, and the smooth movement of the 1st moving member 11 can be achieved. Therefore, appropriate camera shake correction can be performed.

  The imaging device according to the present embodiment is particularly useful when applied to a camera built in a mobile phone. When the imaging device is built in a mobile phone, it is required to be small. For this reason, component parts, such as the 1st actuator 8 and the 1st moving member 11, become small, and it is easy to produce the slight shift | offset | difference of the attachment position or attachment attitude | position of components. In this case, according to the imaging device according to the present embodiment, the installation position of the first support shaft 12 can be adjusted in response to such a shift, so that the first moving member 11 is reliably supported so as to be able to move smoothly. Therefore, it is possible to correct the camera shake appropriately.

  The embodiment described above shows an example of an imaging apparatus according to the present invention. The imaging device according to the present invention is not limited to the imaging device according to these embodiments, and the imaging device according to the embodiment may be modified or otherwise changed without changing the gist described in each claim. It may be applied to.

  For example, in the present embodiment, a description has been given of moving the image pickup optical system 2 with respect to the image pickup device 14 in accordance with camera shake as a shake correction mechanism. However, the image pickup device 14 is moved with respect to the image pickup optical system 2. Also good. Even in this case, the same effect as the imaging device according to the above-described embodiment can be obtained.

1 is an exploded perspective view of an imaging apparatus according to an embodiment of the present invention. It is a top view of the imaging device of FIG. It is sectional drawing in III-III of the imaging device of FIG. It is sectional drawing in IV-IV of the imaging device of FIG. It is an end view in VV of the imaging device of FIG. It is explanatory drawing of the attachment structure of the 1st support shaft in the imaging device of FIG. It is explanatory drawing of the attachment structure of the 1st support shaft in the imaging device of FIG. FIG. 2 is a block diagram illustrating an electrical configuration in the imaging apparatus of FIG. 1. FIG. 2 is a schematic diagram of a camera shake correction circuit in the imaging apparatus of FIG. 1. It is the figure which showed an example of the signal waveform input into the 1st actuator of the imaging device of FIG. 1, and a 2nd actuator.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Upper cover, 2 ... Imaging optical system, 3 ... Support shaft, 4 ... Sphere, 5 ... Second moving member, 6 ... Second actuator, 7 ... Second support shaft, 8 ... First actuator, 9 ... Position detection Magnets, 10 ... actuators, 11 ... first moving member, 12 ... first support shaft, 13 ... imaging element holder, 13a ... groove, 14 ... imaging element, 15 ... hall element, 16 ... photo interrupter, 17 ... substrate, 20, 21, 22 ... friction engagement part, 30 ... first control part, 40 ... second control part, 50 ... gyro sensor.

Claims (2)

An image pickup optical system and an image pickup element that converts an image formed by the image pickup optical system into an electric signal, and either the image pickup optical system or the image pickup element are moved in a first moving direction and a second direction orthogonal to the optical axis direction. In an imaging device that performs camera shake correction by moving in the moving direction,
A base member to which one of the imaging optical system and the imaging element is attached;
A first actuator that is driven by reciprocating a drive shaft by expansion and contraction of a piezoelectric element;
A first moving member that is frictionally engaged with a drive shaft of the first actuator and moves in the first moving direction with respect to the base member by driving of the first actuator;
The first moving member is arranged in the first moving direction, is inserted and assembled in a groove or hole formed in the base member with play, and supports the first moving member so as to be movable in the first moving direction. A support shaft;
The other of the imaging optical system and the imaging element is attached, and a second moving member that moves in the second moving direction with respect to the first member by driving a second actuator;
An imaging apparatus comprising:   The imaging apparatus according to claim 1, wherein the imaging apparatus is a camera built in a mobile phone.

Images