JP2014089243A - Drive device and shake correction apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive mechanism and a shake correction apparatus which achieve accurate operation, while achieving low power consumption.SOLUTION: A drive mechanism according to an embodiment includes a drive unit which allows a second component to move toward a first component in a plane direction orthogonal to an arrangement direction in which the first component and the second component are arranged. The second component faces the first component with a rotating element provided in between, and is pulled toward the first component by a biasing component. One end of the biasing component is fitted, via a first movable component, to the first component so as to be movable in a first direction orthogonal to the arrangement direction. The other end of the biasing component is fitted, via a second movable component, to the second component so as to be movable in a second direction orthogonal to the arrangement direction and to the first direction.

Description

  Embodiments described herein relate generally to a drive device that moves a movable portion in a surface direction with respect to a fixed portion, and a shake correction device that uses the drive device.

  2. Description of the Related Art Conventionally, as a shake correction apparatus, an apparatus that corrects camera shake by moving a movable part holding a camera lens or an image sensor along a plane perpendicular to an optical axis with respect to a fixed part is known. This type of blur correction device includes a spherical spacer disposed between the movable portion and the fixed portion, and a spring that pulls the movable portion toward the fixed portion so as to sandwich the sphere. One end of the spring is fixed to the fixed part, and the other end of the spring is fixed to the movable part.

JP 2010-39072 A JP 2012-32526 A JP 2008-76646 A

  In the conventional blur correction apparatus described above, when the movable part is moved in the surface direction with respect to the fixed part, the springs fixed at both ends are inclined and a slight biasing force is generated between them. This urging force in the surface direction becomes a load of the driving unit that drives the movable unit, and the power consumption increases accordingly. In addition, the urging force in the surface direction hinders precise driving of the movable part and adversely affects accurate blur correction.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a biasing member (spring) when the first member (movable portion) is driven in the surface direction with respect to the second member (fixed portion). It is an object of the present invention to provide a drive device or a shake correction device that can keep power consumption low so as to maintain a posture of ().

  The drive device according to the embodiment includes a first member having a first recess, a second member having a second recess, and the arrangement direction of the first member with respect to the second member. A drive unit that moves along an orthogonal virtual plane, and movement in the first direction along the virtual plane is restricted, and movement in a second direction perpendicular to the first direction is allowed, The first roller member disposed in the first recess and the first roller member disposed in the second recess so that the movement in the second direction is restricted and the movement in the first direction is allowed. Two roller members, and a biasing member that is locked to each of the first roller member and the second roller member and pulls the second member and the first member toward each other. When the first member is driven in the first direction by the driving unit, the non-driving of the driving unit is performed. When the second roller member rolls while maintaining the posture of the urging member during movement, and when the first member is driven in the second direction by the drive unit, The first roller member rolls while maintaining the posture of the biasing member when not driven.

  The blur correction device according to the embodiment includes a first member having a first recess to which an optical component or an image sensor is attached, a second member having a second recess, and a detection unit that detects blur. And a drive unit that moves the first member relative to the second member in a plane direction orthogonal to the arrangement direction based on a detection result in the detection unit, the first member, and the second member. The rolling element disposed between the first member and the first member, and the movement in the first direction along the surface direction is restricted and the movement in the second direction perpendicular to the first direction is allowed. The first roller member disposed in the first recess and the first roller member disposed in the second recess so that the movement in the second direction is restricted and the movement in the first direction is allowed. 2 roller members and the first roller member and the second roller member And an urging member that presses the first and second members toward each other so as to sandwich the rolling element, and the first member is driven by the driving unit. Is driven in the first direction, the second roller member rolls while maintaining the posture of the biasing member when the driving unit is not driven, and the driving unit causes the first roller to roll. When the member is driven in the second direction, the first roller member rolls while maintaining the posture of the biasing member when the driving unit is not driven. .

  According to the present invention, when the first member (movable portion) is driven in the surface direction with respect to the second member (fixed portion), the second member (fixed portion) and the first member (movable portion) are driven. ) Can be driven with the posture of the biasing member (spring) biased. Therefore, the load on the biasing member in the surface direction is eliminated, and the power consumption can be suppressed low.

FIG. 1 is a block diagram of a camera system according to the embodiment. FIG. 2 is an external perspective view of the imaging unit of the camera system of FIG. FIG. 3 is an exploded perspective view of the imaging unit of FIG. FIG. 4 is a perspective view of the assembly in which the lens unit is removed from the imaging unit of FIG. FIG. 5 is a rear view of the assembly of FIG. FIG. 6 is a front view of the movable part of the imaging unit of FIG. FIG. 7 is a flowchart for explaining the operation of the camera system of FIG. FIG. 8 is a flowchart for explaining the blur correction operation of the flowchart of FIG. FIG. 9 is a cross-sectional view for explaining the operating principle of the VCM of the camera system of FIG. FIG. 10 is a perspective view showing a part of the attachment structure according to the first embodiment in which the movable part of the imaging unit of FIG. 2 is attached to the fixed part so as to be movable in the surface direction. FIG. 11 is a partially enlarged perspective view in which a part of FIG. 10 is partially enlarged. FIG. 12 is a partially enlarged cross-sectional view showing a main part of the mounting structure according to the second embodiment in a partially enlarged manner. FIG. 13 is a partially enlarged cross-sectional view showing a main part of the mounting structure according to the third embodiment in a partially enlarged manner. FIG. 14 is a partially enlarged cross-sectional view showing a main part of the mounting structure according to the fourth embodiment in a partially enlarged manner. FIG. 15 is a partially enlarged cross-sectional view showing a main part of the mounting structure according to the fifth embodiment in a partially enlarged manner.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram of a camera system 100 according to the embodiment. The camera system 100 according to the present embodiment causes camera shake by moving a movable unit 70 (see FIG. 6) equipped with an image sensor that obtains an image signal by photoelectric conversion along a plane (virtual plane) orthogonal to the optical axis. It has a camera shake correction function to correct. Here, as an example, a case where the present invention is applied to a digital camera will be described. The present invention is not limited to the embodiments described below, and various modifications can be made without departing from the spirit of the present invention.

  In the following description, the direction from right to left in FIG. 1 is referred to as the front, and the opposite is referred to as the rear. Here, it is assumed that the camera system 100 is arranged in a posture for imaging a subject from a horizontal direction to a horizontal direction. In this case, the axis that coincides with the optical axis O of the camera system 100 is defined as the Z-axis (front-rear direction axis), and the two axes that are orthogonal to each other along the plane orthogonal to the Z-axis are the X-axis (horizontal axis). ) And Y axis (vertical axis).

  As shown in FIG. 1, the camera system 100 forms an imaging unit 2 including an imaging device such as a charge coupled device (CCD) or a CMOS sensor, and an optical image of a subject (not shown) on the imaging unit 2. For taking lenses 3 and 4. Electric power necessary for the camera system 100 is supplied from the power supply circuit 5 to the control microcomputer 10.

  The photographing lenses 3 and 4 are zoom lenses that can change the focal length by displacing the variable magnification lens 4 in the optical axis direction. The variable magnification lens 4 is displaced along the optical axis by a DC motor 56 (see FIG. 3) of the lens driving mechanism 11. The focus lens 3 is vibrated in the optical axis direction by a stepping motor (not shown) of the lens driving mechanism 11.

  A diaphragm shutter 6 is disposed between the photographing lenses 3 and 4. The aperture shutter 6 is driven by an actuator such as a stepping motor (not shown) of the aperture shutter drive mechanism 12. Information such as the focusing distance, focal length, and aperture value of the photographing lenses 3 and 4 is detected by the position detection sensors 7 and 8, an encoder (not shown), and the like, and a control microcomputer 10 (hereinafter referred to as a control μcom 10). Input).

  The imaging unit 2 is held by a drive mechanism 20 that moves the imaging unit 2 along a plane orthogonal to the optical axis O. Details of the drive mechanism 20 will be described later. In front of the imaging unit 2, an optical filter 9 such as an optical low-pass filter or an infrared cut filter is disposed.

  The imaging unit 2 is electrically connected to the image processing unit 14 via an imaging unit control circuit 13 that controls the operation of the imaging unit 2. The image processing unit 14 is connected to the control μcom 10. The image processing unit 14 uses a storage area such as the SDRAM 15 or the flash memory 16 to generate an image based on the image signal output from the imaging unit 2 and processed by the imaging unit control circuit 13.

  On the other hand, the image processing unit 14 also performs control related to automatic exposure and autofocus. In the automatic exposure, the brightness value of a predetermined area of the image generated by the image processing unit 14 is detected, and the aperture size of the aperture shutter 6 and the shutter speed of the aperture shutter 6 are controlled so that an appropriate exposure amount is obtained. It is. Autofocus is based on a so-called contrast detection method. The focus lens 3 is vibrated with a predetermined amplitude in the optical axis direction (wobbling operation) to generate a plurality of images at positions on different optical axes, and the contrast value in a predetermined region (focus area) of these images Is calculated to detect whether the focal position is on the long-distance side or the short-distance side. Then, when an image is captured (photographed) while moving the focus lens 3 in the direction of focus while performing a wobbling operation, the state of the maximum contrast (focal position) can be detected from those images. By stopping the focus lens 3, the autofocus is performed. All of the automatic exposure control circuit and the autofocus control circuit may not be provided in the image processing unit 14, and may be provided in another circuit unit such as the control μcom 10.

  The image processing unit 14 is connected to an image display device 17 such as a liquid crystal display device or an organic electroluminescence display device (organic EL display device) disposed behind the camera body. Images can be displayed. The image display device 17 also functions as a so-called electronic viewfinder that displays images captured by the camera system 100 in real time. In addition, the camera system 100 of the present embodiment is configured not to have an optical finder, but a so-called single-lens reflex optical finder may be provided.

  The recording medium 18 is a recording medium such as a flash memory or an HDD, and is detachably attached to the camera body. The recording medium 18 records data such as an image captured by the camera system 100 (including sound in the case of a moving image). Since the data of the captured image has a large amount of information as it is, it is recorded on the recording medium 18 after being compressed to reduce the amount of information. The image processing unit 14 compresses the image data. Conversely, the image processing unit 14 also performs image expansion processing when the compressed data recorded on the recording medium 18 is expanded to the original image data and displayed on the image display device 17.

  The nonvolatile memory 19 is a storage unit made of, for example, an EEPROM that stores predetermined control parameters necessary for controlling the camera system 100. The nonvolatile memory 19 is provided so as to be accessible from the control μcom 10.

  The control μcom 10 drives an operation display LCD 21 and an operation display LED 22 for displaying the operation state of the camera system 100 and notifying the user, a camera operation unit 23, a built-in strobe 24, and an external strobe (not shown). A strobe control circuit 25 is connected. The camera operation unit 23 is a switch group including operation buttons necessary for operating the camera system 100, such as a release SW, a mode change SW, and a power SW.

  Furthermore, the camera system 100 includes a battery 26 as a power source, and a power supply circuit 5 that converts and supplies the voltage of the battery 26 to a voltage required by each circuit unit constituting the camera system 100. The camera system 100 is also provided with a voltage detection circuit (not shown) that detects a voltage change when current is supplied from an external power source via a jack (not shown).

  The camera system 100 of the present embodiment moves the imaging unit 2 in the X-axis direction, the Y-axis direction, and the rotation directions around the Z-axis and fixes the imaging unit 2 at a predetermined position in order to correct camera shake. Drive mechanism 20 (blur correction device) is provided. That is, by holding the imaging unit 2 via the drive mechanism 20, the imaging unit 2 can be mechanically moved along the XY plane, and the imaging unit 2 can be mechanically fixed at a predetermined position. it can. Note that the camera shake correction mentioned here does not necessarily mean only camera shake when the camera body is held by hand, but includes camera shake correction when attached to a tripod or robot arm.

  The drive mechanism 20 includes an X-axis gyro 31, a Y-axis gyro 32, a Z-axis rotation detector 33, a Y-axis acceleration sensor 34, an X-axis acceleration sensor 35, a position detection sensor (X direction) 36, and a position detection sensor (Y direction). 37, an image stabilization control circuit 30, an X-axis actuator 41, a Y-axis actuator 42, a holder 43 (first member) holding the imaging unit 2, a fixed frame 44 (second member), and an actuator drive circuit 40. doing. The image stabilization control circuit 30 is connected to the actuator drive circuit 40, and the actuator drive circuit 40 is connected to the control μcom 10.

Hereinafter, the imaging unit 1 incorporated in the camera system 100 of FIG. 1 will be described with reference to FIGS. 2 to 6.
2 is an external perspective view of the imaging unit 1 as viewed obliquely from the front, FIG. 3 is an exploded perspective view of the imaging unit 1, and FIG. 4 is a set with the lens unit 50 removed from the imaging unit 1. 5 is a perspective view of the solid body 60, FIG. 5 is a rear perspective view of the assembly 60 of FIG. 4 as viewed obliquely from the rear, and FIG. 6 is a front view of the movable portion 70 of the imaging unit 1. The assembly 60 illustrated in FIGS. 4 and 5 includes several components of the drive mechanism 20 illustrated in FIG. Therefore, in the following description, the components of the drive mechanism 20 of FIG.

  As shown in FIG. 3, the imaging unit 1 includes a lens frame 50, a fixed frame 44, a holder 43, a yoke 51 disposed in front of the holder 43, a substrate 52 and a holder 43 that are stacked from the rear of the holder 43. Three magnets 53a, 53b, 53c and three yokes 54a, 54b, 54c arranged behind each magnet. The substrate 52 includes the imaging unit 2.

  As shown in FIG. 6, the holder 43 is a plate-like body having a substantially rectangular hole 43 a for exposing the imaging unit 2 to the front at a substantially center, and the three coils 55 a and 55 b around the hole 43 a. , 55c. The substrate 52 provided with the imaging unit 2 is overlapped from the rear of the holder 43 so that the imaging unit 2 fits into the hole 43a, and is attached to the holder 43 by three screws 52a.

  Of the three coils, the two coils 55a and 55b that are spaced apart in the Y-axis direction are X-direction drive coils for moving the holder 43 in the X-axis direction with respect to the fixed frame 44. The remaining one coil 55 c extending in the X-axis direction is a Y-direction driving coil for moving the holder 43 in the Y-axis direction with respect to the fixed frame 44. That is, the coils 55a and 55b function as the X-axis actuator 41 together with the opposing magnets 53a and 53b, and the coil 55c functions as the Y-axis actuator 42 together with the magnet 53c.

  The holder 43 has three substantially rectangular attachment holes 43b for attaching the three coils 55a, 55b, and 55c. The three coils 55a, 55b, and 55c are fixed to the holder 43 by being fitted into the corresponding mounting holes 43b and bonding their peripheral portions to the edges of the mounting holes 43b with an adhesive.

  In addition to this, a flexible printed circuit board 45 (FPC 45) for coils connected to the three coils 55a, 55b, and 55c is attached to the holder 43. Further, the FPC 46 for the imaging unit 2 is attached to the substrate 52. The holder 43 is attached with a hall element 47a for detecting the position of the holder 43 in the X-axis direction and a hall element 47b (not shown) for detecting the position of the holder 43 in the Y-axis direction. .

  The holder 43 is relative to the fixed frame 44 in a state in which the substrate 52 having the imaging unit 2, the three coils 55 a, 55 b, 55 c, and the two Hall elements 47 a, 47 b are attached (the state in FIG. 6). Moving. That is, the holder 43, the imaging unit 2, the substrate 52, the coils 55a, 55b, and 55c, and the Hall elements 47a and 47b function as an integrated movable unit 70.

  The lens unit 50 includes a focus lens 3, a variable power lens 4, a stepping motor (not shown) that vibrates the focus lens 3 in the optical axis direction, and a DC motor 56 that displaces the variable power lens 4 in the optical axis direction (see FIG. 3). ) Including a lens drive mechanism 11, an aperture shutter 6, an aperture shutter drive mechanism 12 including an actuator (not shown) such as a stepping motor for driving the aperture shutter 6, position detection sensors 7 and 8, and an FPC 57 for a lens unit ( 2).

  When assembling the imaging unit 1 shown in FIG. 2, first, as described above, the substrate to which the imaging unit 2 and the imaging unit FPC 46 are attached is attached to the coils 55a, 55b, 55c, the hall elements 47a, 47b, and the coil FPC 45. The movable part 70 shown in FIG. 6 is assembled by attaching to the attached holder 43 with three screws 52a.

  On the other hand, three yokes 54 a, 54 b, 54 c are arranged in front of the fixed frame 44, and two screws (a total of six) from the rear of the fixed frame 44 to the respective yokes 61 a, 61 b. , 61c, and the three yokes 54a, 54b, 54c are fixed to the fixed frame 44 (see FIG. 5). And magnet 53a, 53b, 53c is piled up and attached in front of each yoke 54a, 54b, 54c. In addition, two detection magnets 48 a and 48 b for causing a magnetic force change in the two Hall elements 47 a and 47 b of the movable unit 70 described above are attached to the fixed frame 44.

  Then, the movable part 70 described above is movably overlapped in front of the fixed frame 44 with respect to the above-described fixed-side members 44, 54a, 54b, 54c, 53a, 53b, 53c, 48a, 48b (fixed part). Deploy.

  At this time, three spherical rollers 72a, 72b, 72c (rolling elements) described later, three tension springs 74a, 74b, 74c (biasing members), and six cylindrical rollers for movably attaching both ends of each spring. 76 a, 76 b, 76 c, 78 a, 78 b, 78 c (first roller member, second roller member) are attached between the fixed frame 44 and the holder 43.

  The plurality of members 72a, 72b, 72c, 74a, 74b, 74c, 76a, 76b, 76c, 78a, 78b, 78c arranged between the fixed frame 44 and the holder 43 are combined in a predetermined position as will be described later. The movable part 70 is attached so as to be movable with respect to the fixed part. The mounting structure 80 including the plurality of members 72a, 72b, 72c, 74a, 74b, 74c, 76a, 76b, 76c, 78a, 78b, and 78c will be described in detail later.

  Further, thereafter, as shown in FIG. 4, the yoke 51 is disposed in front of the holder 43, and the yoke 51 is fixed to the fixed frame 44 via the four screws 58. At this time, the yoke 51 is a component of the fixed portion, and is thus attached to the movable portion 70 in a non-contact state. Finally, the lens unit 50 is disposed so as to overlap the assembly 60 from the front of the yoke 51, and the lens unit 50 is fixed to the fixed frame 44 by the three screws 59 inserted from the rear of the fixed frame 44.

Hereinafter, the operation of the above-described camera system 100 will be described with reference to FIGS.
When the power button is operated and the power is turned on, the control μcom 10 starts the operation of the main flow shown in FIG.
When the operation is started, first, the control μcom 10 performs initialization at the time of starting the system, and in this, the movable unit 70 of the imaging unit 1 is centered at the neutral position (step S1). At this time, the control μcom 10 drives the movable unit 70 so that the center of the imaging unit 2 is disposed on the optical axis O.

  When driving the movable portion 70, the control μcom 10 detects the position along the XY plane of the movable portion 70 by monitoring the outputs of the Hall elements 47a and 47b, and controls the actuator drive circuit 40 based on the detection result. Then, currents in predetermined directions are supplied to the X-direction driving coils 55a and 55b of the X-axis actuator 41 and the Y-direction driving coil 55c of the Y-axis actuator 42, respectively. The X-axis actuator 41 and the Y-axis actuator 42 are well-known voice coil motors (VCM) and operate based on the same operation principle.

  When the initialization at the time of system startup in step S1 is completed, the control μcom 10 determines whether or not the shake correction mode switch is ON (step S2), and if the operation mode of the camera system 100 is the shake correction mode. If this is the case (step S2; YES), blur correction processing is executed (step S3).

  On the other hand, if it is determined as a result of the determination in step S2 that the operation mode of the camera system 100 is not the shake correction mode (step S2; NO), the control μcom 10 determines whether the imaging unit 2 is held in the neutral position. It is determined whether or not (step S4). If the neutral holding state is not determined as a result of the determination in step S4 (step S4; NO), the control μcom 10 controls the actuator drive circuit 40 to center the imaging unit 2 at the neutral position (step S5).

  Next, the control μcom 10 performs live view display (step S6). Here, an image signal is acquired by the imaging unit 2, image processing is performed for live view display, and live view display is performed on the image display device 17. In this state, the control μcom 10 determines whether or not the playback button has been pressed (step S7). If the result of this determination is that the playback button has been pressed (step S7; YES), the control μcom 10 plays back the image (step S8). Here, the control μcom 10 reads out the image data from the recording medium 18 and displays it through the image display device 17.

  After executing the reproduction in step S8 or when the reproduction button has not been pressed in step S7 (step S7; NO), the control μcom 10 next determines whether or not the moving image button has been pressed. (Step S9). In step S9, the control μcom 10 detects the operation state of the moving image button in the camera operation unit 23, and determines based on the detection result.

  As a result of the determination in step S9, if it is determined that the moving image button has been pressed (step S9; YES), the control μcom 10 inverts the recording flag (step S10). In step S10, the recording flag is inverted when the recording flag is OFF, and is turned OFF when it is ON.

  After the recording flag is reversed in step S10 or when the moving image button has not been pressed as a result of the determination in step S9 (step S9; NO), the control μcom 10 is next recording a moving image. It is determined whether or not (step S11). If the recording flag is ON, the moving image is being recorded. Here, the determination is made based on whether the recording flag is ON.

  If the result of determination in step S11 is that video recording is not in progress (step S11; NO), the control μcom 10 determines whether the first release has been pressed, in other words, whether the first release switch has been turned from OFF to ON. It is determined whether or not (step S12). This determination is made based on the detection result obtained by detecting the state of the first release switch linked to the release button by the camera operation unit 23. In step S12, it is determined whether the first release switch has been changed from OFF to ON. If the ON state is maintained, the determination result is NO.

  If the result of determination in step S12 is that the first release has been pressed (step S12; YES), an image is taken when the first release is pressed, and AE is performed (step S13). The image capturing here is to acquire an image signal by the imaging unit 2, perform image processing, and acquire image data used for AE, and does not record the image data on the recording medium 18.

  In this AE, the subject brightness is measured from the image data by the image processing unit 14, exposure control values such as an aperture value and a shutter speed are determined, and live view display displayed on the image display device 17 is performed with appropriate exposure. Determine the control value.

  If AE is performed in this way, then AF is performed (step S14). In this step, the focus lens 3 is wobbled, and the image processing unit 14 evaluates the contrast of the image data acquired by the imaging unit 2 to detect the direction of the focal position, and the focus lens 3 is controlled by the control μcom 10. The focus lens 3 is driven and controlled to move in the detection direction so that the image has the highest contrast.

  If the result of determination in step S12 is that the release button has not been pressed and the first release switch has not changed from OFF to ON (step S12; NO), then the control μcom 10 has next pressed the second release. In other words, it is determined whether or not the release button has been fully pressed and the second release switch has been turned from OFF to ON (step S15). In step S15, the state of the second release switch linked to the release button is detected by the camera operation unit 23, and a determination is made based on the detection result.

  If the result of determination in step S15 is that the second release has been pressed (step S15; YES), the control μcom 10 performs still image shooting (step S16). Here, the imaging unit 2 performs exposure, acquires an image signal corresponding to the subject image, and temporarily stores it in the SDRAM 15. When still image shooting is performed in this manner, the image processing unit 14 reads out an image signal from the SDRAM 15, performs image processing on still image data based on the image signal (step S17), and further performs image compression processing. After performing, it records on the recording medium 18 (step S18).

  If the result of determination in step S11 is that moving image recording is in progress (step S11; YES), then the control μcom 10 performs an AE operation in the same manner as in step S13 (step S19). Subsequently, an AF operation is performed in the same manner (step S20), and then moving image shooting is performed (step S21). Here, a moving image signal is acquired by the imaging unit 2, the image processing unit 14 performs image processing on the image data (step S22), the moving image is compressed, and then the moving image data is stored in the recording medium 18. (Step S23).

  Then, when the AF operation is completed in step S14, or when the release button is not fully pressed as a result of the determination in step S15 (step S15; NO), or in step S18, the still image is captured. When the recording of the image data on the recording medium 18 is completed, or when the recording of the moving image image data on the recording medium 18 is completed in step S23, the control μcom 10 turns off the power switch of the camera operation unit 23. It is determined whether or not (step S24). If the result of this determination is that the power supply is not OFF (step S24; NO), the control μcom 10 returns to the processing of step S2. On the other hand, if the result of determination is that the power supply is OFF (step S24; YES), the control μcom 10 ends the main flow after performing the main flow end operation.

In the blur correction process in step 3, the control μcom 10 controls the actuator drive circuit 40 according to the subflow shown in FIG.
That is, the control μcom 10 first controls the actuator drive circuit 40 so that the center of the imaging unit 2 overlaps the imaging optical axis O, and centers the movable unit 70 to the neutral position (step S31).

  In this state, the control μcom 10 outputs the outputs of the X-axis gyro 31, Y-axis gyro 32, Z-axis rotation detector 33, Y-axis acceleration sensor 34, and X-axis acceleration sensor 35 connected to the image stabilization control circuit 30. Based on the above, various blur amounts of the camera system 100 are detected (step 32).

  In the process of step 32, the X-axis gyro 31 detects the angular velocity of rotation (blur) around the X axis of the camera system 100, and the Y-axis gyro 32 determines the angular velocity of rotation around the Y axis of the camera system 100. The Z-axis rotation detector 33 detects the rotational angular velocity and the rotation center position in the XY plane of the camera system 100. The X-axis acceleration sensor 35 detects acceleration in the X-axis direction in the XY plane of the camera system 100, and the Y-axis acceleration sensor 34 detects acceleration in the Y-axis direction in the XY plane of the camera system 100. These X-axis gyro 31, Y-axis gyro 32, Z-axis rotation detector 33, X-axis acceleration sensor 35, and Y-axis acceleration sensor 34 function as a detection unit.

  Then, the image stabilization control circuit 30 calculates a camera shake correction amount from the angular velocity and the rotation center position of the camera system 100 detected by the detection unit (step 33). The control μcom 10 controls the actuator driving circuit 40 based on the camera shake correction amount calculated by the image stabilization control circuit 30 to move the imaging unit 2 along the XY plane so as to compensate for the shake. The camera shake is corrected (step 34).

  Here, with reference to FIG. 9, the operation principle of the VCM (voice coil motor) of the X-axis actuator 41 and the Y-axis actuator 42 will be described by taking, for example, a Y-direction drive VCM as an example. As described above, the Y-direction driving VCM includes the magnet 53c fixed on the fixed portion side, the two yokes 51 and 54c, and the coil 55c fixed on the movable portion side.

  The magnet 53c has a south pole and a north pole polarized along the driving direction F (here, the Y-axis direction), and generates a magnetic flux in the direction of the arrow W shown in the figure. At this time, the two yokes 51 and 54c sandwiching the magnet 53c in the Z-axis direction constitute a magnetic circuit and generate a strong magnetic flux in the arrow W direction. The magnetic flux W is reversed with the polarization line of the magnet 53c as a boundary, and is opposite in the left and right directions in the figure.

  On the other hand, the coil 55c arranged so as to overlap the magnet 53c is wound in an annular shape connecting a portion overlapping the S pole and a portion overlapping the N pole. That is, when a current in a certain direction is passed through the coil 55c, the direction of the current flowing through the portion overlapping the S pole and the direction of the current flowing through the portion overlapping the N pole are reversed. For this reason, the driving force F of a fixed direction acts on a movable part by combining with the mutually opposite magnetic flux as mentioned above.

  That is, based on the blur amount detected by the detection unit described above, the current having the magnitude and the direction in which the driving force F described above can be applied in the direction to cancel the blur is represented by the VCM for the X direction and the Y direction. Camera shake can be corrected by flowing each drive VCM.

  The attachment structure 80 according to the first embodiment in which the movable part 70 is attached to the fixed part so as to be movable in the plane direction will be described below with reference to FIGS. 10 and 11 together with FIGS. 10 is a perspective view showing a part of the mounting structure 80, and FIG. 11 is a partially enlarged sectional view taken along line F11-F11 in FIG.

  As described above, the mounting structure 80 includes three spherical rollers 72a, 72b, 72c, three tension springs 74a, 74b, 74c, and six cylindrical rollers 76a, 76b, 76c, 78a, 78b, 78c. FIG. 10 shows a structure (connection mechanism) in which two cylindrical rollers 76b and 78b are attached to both ends of one tension spring 74b. The mounting structure 80 has two other structures similar to those in FIG. 10, but here, only the combinations illustrated in FIG. 10 will be representatively described, and descriptions of the other combinations will be omitted.

  The three spherical rollers 72a, 72b, 72c are provided on the front surface (front surface) of the fixed frame 44 at three concave portions (not shown) provided on the rear surface (rear surface) of the holder 43 and at positions facing the three concave portions. They are respectively arranged between the three recesses not shown. Since the depth of each recess is shorter than the radius of the spherical roller, when the holder 43 is opposed to the fixed frame 44 with the three spherical rollers 72a, 72b, 72c interposed therebetween, a gap is formed between them. In addition, the positions along the XY plane of the spherical rollers 72a, 72b, 72c and the concave portions facing each other are designed to be equal positions where the mutual distances are substantially the same.

  The three tension springs 74a, 74b, and 74c are attached near the spherical rollers 72a, 72b, and 72c outside the spherical rollers 72a, 72b, and 72c, respectively. As shown in FIG. 10, a cylindrical roller 76b (second roller member) is attached to one end (lower end of the drawing) of the tension spring 74b (biasing member), and the other end (upper end of the drawing) of the tension spring 74b. A cylindrical roller 78b (first roller member) is attached (see FIG. 11).

  The holder 43 on the movable portion 70 side is provided with a rectangular recess 82 (first concave portion) that accommodates the cylindrical roller 78b in a rollable manner, and the cylindrical roller 76b is rolled on the fixed frame 44 on the fixed portion side. A rectangular recess 84 (second recess) that is movably accommodated is provided. These two recesses 82 and 84 are provided at positions that face each other in a state where the movable portion 70 is disposed at a neutral position with respect to the fixed portion.

  The recess 82 is provided so as to be recessed from the front side of the holder 43, and the cylindrical roller 78 b is mounted in the recess 82 from the front of the holder 43. The recess 84 is provided so as to be recessed from the rear side of the fixed frame 44, and the cylindrical roller 76 b is attached to the recess 84 from the rear of the fixed frame 44.

  A slit-like opening 81a (hole) that is long in the Y-axis direction is provided at the bottom of the recess 82, and as a result, on both sides in the X-axis direction with the opening 81a interposed therebetween, as a result, the Y-axis direction Are provided with two rails 81b, 81b. In addition, a slit-like opening 83a (hole) that is long in the X-axis direction is provided at the bottom of the recess 84, and as a result, the X-axis direction sandwiches the opening 83a on both sides in the Y-axis direction. Two rails 83b and 83b extending in the axial direction are provided.

  The surface where the rails 81b, 81b contact the outer peripheral surface of the cylindrical roller 78b (first contact surface) and the surface where the rails 83b, 83b contact the outer peripheral surface of the cylindrical roller 76b (second contact surface) are respectively The movable part 70 is parallel to the above-described virtual plane (XY plane) with respect to the fixed part. The wall of the recess 82 that restricts the movement of the cylindrical roller 78b in the axial direction has a surface perpendicular to the contact surface of the rails 81b and 81b, and the recess 84 that restricts the movement of the cylindrical roller 76b in the axial direction. This wall has a surface perpendicular to the contact surface of the rails 83b, 83b.

  An annular hook 73a coiled in parallel with the XZ plane is provided at one end of the tension spring 74b, and an annular hook 73b coiled in parallel with the YZ plane is provided at the other end of the tension spring 74b. Is provided. That is, the hook 73a has an axis along the Y axis (axis along the second direction), and the hook 73b has an axis along the X axis (axis along the first direction).

  A cylindrical roller 76b having a posture in which a longitudinal axis is arranged in parallel to the Y axis is attached to the hook 73a on the fixed portion side, and a cylindrical roller having a posture in which a longitudinal axis is arranged in parallel to the X axis on the hook 73b on the movable portion 70 side. 78b is attached. An annular groove 75 (groove portion) for hooking the hook 73a is provided on the outer peripheral surface of the cylindrical roller 76b in the substantially axial direction, and the hook 73b is hooked on the outer peripheral surface of the cylindrical roller 78b in the substantially axial direction. An annular groove 77 (groove portion) is provided.

  When the tension spring 74b and the two cylindrical rollers 76b and 78b in FIG. 10 are attached, the two spherical rollers 72a, 72b and 72c are sandwiched between the fixed frame 44 and the holder 43 as described above. The tension springs 74b are disposed in the two openings 81a and 83a that overlap the two recesses 82 and 84 in the Z-axis direction. At this time, a part of the hook 73a at one end of the tension spring 74b extends into the recess 84 through the opening 83a, and a part of the hook 73b at the other end of the tension spring 74b is recessed through the opening 81a. It extends into 82 (FIG. 11).

  In this state, both ends of the tension spring 74b are pulled in the Z-axis direction so that the groove 75 of the cylindrical roller 76b is hooked on the hook 73a at one end, and the groove 77 of the cylindrical roller 78b is hooked on the hook 73b at the other end. As a result, the outer peripheral surface of the cylindrical roller 76b on the fixed portion side near the both axial ends engages with the two rails 83b and 83b at the bottom of the recess 84, and the cylindrical roller 76b is accommodated in the recess 84. The cylindrical roller 78b is accommodated in the recess 82 by engaging the outer peripheral surfaces of the cylindrical roller 78b near the both ends in the axial direction of the movable portion 70 with the two rails 81b, 81b at the bottom of the recess 82. .

  In this state, since the tension spring 74b is slightly stretched, the outer peripheral surfaces of the cylindrical rollers 76b and 78b at both ends are pressed by the rails 81b and 83b of the recesses 82 and 84, respectively. 43 is pulled in the direction of the fixed frame 44. Further, in this state, the cylindrical roller 76b on the fixed part side can roll in the X-axis direction (first direction) along the rails 83b and 83b, and the cylindrical roller 78b on the movable part 70 side can move to the rails 81b and 81b. Along the Y-axis direction (second direction). In other words, the movement of the cylindrical roller 76b on the fixed portion side in the axial direction (second direction) is restricted by the wall of the recess 84, and the cylindrical roller 78b on the movable portion 70 side is restricted in the axial direction by the wall of the recess 82. Movement in the (first direction) is restricted.

  Therefore, at the time of blur correction, for example, when the movable portion 70 (holder 43) is moved in the X-axis direction with respect to the fixed portion, the cylindrical roller 76b on the fixed portion side moves in the X-axis direction along the rail 83b. To do. In this case, the material of each constituent member is such that the frictional force generated between the outer peripheral surface of the cylindrical roller 76b and the rail 83b is larger than the frictional force generated between the groove 75 of the cylindrical roller 76b and the hook 73a of the tension spring 74b. Since the spring constant of the tension spring 74b (that is, the pressing force of the cylindrical roller 76b against the rail 83b) is determined, the cylindrical roller 76b rolls in contact with the rail 83b.

  On the other hand, at this time, the cylindrical roller 78b on the movable portion 70 side remains in place because the movement (rolling) in the X-axis direction is restricted by the inner wall of the recess 82. In other words, in this case, the cylindrical roller 78b on the movable part 70 side moves in the X-axis direction together with the movable part 70. In other words, in this case, the cylindrical roller 78b on the movable part 70 side is restricted from moving in the X-axis direction, while the cylindrical roller 76b on the fixed part side rolls in the X-axis direction. Without tilting the shaft extending in the axial direction, the movable portion 70 moves in the moving direction (that is, the X-axis direction) while maintaining its straight posture.

  As described above, by rolling while the cylindrical roller 76b is in contact with a part of the fixed frame 44, friction between the two can be made extremely small, and only a slight force acts in the X-axis direction. The cylindrical roller 76b can be rolled along the rail 83b. As a result, it is possible to prevent the problem that the cylindrical roller 76b remains in place due to the frictional force and the tension spring 74b is inclined, and undesired stress is generated along the moving direction of the movable portion 70 (that is, the X-axis direction). Can be prevented.

  On the other hand, when the movable part 70 (holder 43) is moved in the Y-axis direction with respect to the fixed part during blur correction, the cylindrical roller 78b on the movable part 70 side moves in the Y-axis direction along the rail 81b. In this case, the material of each constituent member is such that the frictional force generated between the outer peripheral surface of the cylindrical roller 78b and the rail 81b is larger than the frictional force generated between the groove 77 of the cylindrical roller 78b and the hook 73b of the tension spring 74b. Since the spring constant of the tension spring 74b (ie, the pressing force of the cylindrical roller 78b against the rail 81b) is determined, the cylindrical roller 78b rolls in contact with the rail 81b.

  On the other hand, at this time, the cylindrical roller 76b on the fixed portion side remains in place because the movement (rolling) in the Y-axis direction is restricted by the inner wall of the recess 84. In other words, in this case, the cylindrical roller 76b on the fixed portion side is restricted from moving in the Y-axis direction, while the cylindrical roller 78b on the movable portion 70 side rolls in the Y-axis direction. Without tilting the shaft extending in the axial direction, it remains in place while maintaining its straight posture.

  As described above, by rolling the cylindrical roller 78b in contact with a part of the holder 43, the friction between the two can be made extremely small, and only a slight force acts in the Y-axis direction. The roller 78b can be rolled along the rail 81b. As a result, it is possible to prevent a problem that the cylindrical roller 78b stays in place by the frictional force and the tension spring 74b is inclined, and undesired stress is generated along the moving direction of the movable portion 70 (that is, the Y-axis direction). Can be prevented.

  Therefore, when the movable part 70 moves in the X-axis direction with respect to the fixed part and the movable part 70 moves in the Y-axis direction with respect to the fixed part, there is a problem that the tension spring 74b is inclined. Undesirable stress along the XY plane acting on the movable portion 70 can be prevented. In addition, when the movable unit 70 is moved along the XY plane in a direction not parallel to the X axis or the Y axis during blur correction, the fixed unit side cylindrical roller 76b and the movable unit 70 side cylindrical roller 78b are also moved. As both roll, the stress component along the X-axis direction can be absorbed and the stress component along the Y-axis direction can be absorbed.

  In other words, the two cylindrical rollers 76b and 78b described with reference to FIGS. 10 and 11 are mounted in directions that allow rolling in the X-axis direction and the Y-axis direction, respectively, but the axes of the two cylindrical rollers 76b and 78b intersect each other. The mounting posture can be arbitrarily selected. In this case, the “crossing direction” does not necessarily have to be a perpendicular direction, and is preferably set to an angle close to 90 °. For example, as shown in FIG. 4, another cylindrical roller 78a at the upper left in the drawing is attached at an angle that is 90 ° different from the cylindrical roller 78b on the movable portion 70 side described in FIG.

  As described above, according to the present embodiment, both ends of the three tension springs 74a, 74b, and 74c that pull the movable portion 70 toward the fixed portion are respectively in the XY plane with respect to the holder 43 and the fixed frame 44. Since the movable part 70 is moved along the XY plane with respect to the fixed part during blur correction, the movable part 70 is aligned along the Z-axis direction. Undesirable stresses other than force can be prevented from acting. Thereby, the power consumption at the time of blur correction can be suppressed to a low level, and a precise operation of the movable part 70 becomes possible.

Hereinafter, another embodiment will be described with reference to FIGS. 12 to 15.
12 is a cross-sectional view of a cylindrical roller 110 according to the second embodiment, FIG. 13 is a cross-sectional view of a cylindrical roller 120 according to the third embodiment, and FIG. 14 is a cross-sectional view of the fourth embodiment. FIG. 15 is a cross-sectional view of the cylindrical roller 130 according to the fifth embodiment. In the following description, components other than the structure of the cylindrical roller that function in the same manner as the mounting structure of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. Here, the cylindrical rollers 110, 120, 130, and 140 on the movable portion 70 side will be described in correspondence with the structure of FIG. 11, but the cylindrical rollers on the fixed portion side are also attached with a phase difference of 90 °. Have the same structure.

  A cylindrical roller 110 in FIG. 12 has an annular groove 112 (V groove) having a V-shaped cross section instead of the groove 77 of the cylindrical roller 78b of the first embodiment. The groove 112 functions to restrict movement of the hook 73b of the tension spring 74b in the axial direction (X-axis direction in the present embodiment). As a result, both ends of the tension spring 74b can be more stably connected to the cylindrical roller, and play does not occur.

  The cylindrical roller 120 in FIG. 13 has a rubber layer 122 on the outer peripheral surface thereof. The rubber layer 122 has a cylindrical shape divided into two at the groove 77 portion. The rubber layer 122 plays a role of increasing the frictional force between the surfaces of the two rails 81 b and 81 b at the bottom of the recess 82 of the holder 43. As a result, a frictional force larger than the frictional force generated between the hook 73b and the groove 77 can be generated between the surface of the cylindrical roller 120 and the rail 81b, and the cylindrical roller 120 rolls along the rail 81b. Can be made easier.

  The cylindrical roller 130 of FIG. 14 has an engaging member 132 that engages the other end of the tension spring 74b, and a rotating member 136 that is rotatably provided on the outside of the engaging member 132 via a bearing 134. The rotating member 136 rotates relative to the engaging member 132 and rolls along the rails 81b and 81b. In the present embodiment, the surface of the engaging member 132 is exposed to the groove 77 and the hook 73 b is hooked on the groove 77, but the hook 73 b may be fixed to the engaging member 132. Thereby, the cylindrical roller 130 can be rotated more smoothly with respect to the tension spring 74b, and generation | occurrence | production of an undesirable stress can be prevented.

  A cylindrical roller 140 in FIG. 15 has engaging concave portions 144 and 144 that engage with projecting portions 142 and 142 projecting from the contact surfaces of the rails 81b and 81b on the outer peripheral surfaces at both ends in the axial direction, respectively. The projecting portion 142 is provided linearly along the rail 81 b, and the engaging recess 144 is provided in an annular shape on the outer peripheral surface of the cylindrical roller 140. The projecting portion 142 and the engaging recess 144 function to allow the cylindrical roller 140 to roll and restrict the movement of the cylindrical roller 140 in the axial direction.

  In this embodiment, the projecting portion 142 is provided on the cylindrical roller 140 side and the engaging recess 144 is provided on the rail 81b side. However, the engaging recess 144 is provided on the cylindrical roller 140 side and projecting on the rail 81b side. A portion 142 may be provided. Further, the cross-sectional shapes of the protrusion 142 and the engagement recess 144 are not limited to the illustrated ones.

  Although several embodiments have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  Hereinafter, the inventions according to other embodiments will be additionally described.

[1]
A drive unit that moves the second member relative to the first member in a plane direction perpendicular to the alignment direction;
A rolling element disposed between the second member and the first member;
A biasing member that pulls the second member toward the first member;
A first moving member attached to the first member such that one end of the biasing member is movable in a first direction orthogonal to the arrangement direction;
A second moving member attached to the second member so that the other end of the biasing member is movable in a second direction perpendicular to the arrangement direction and perpendicular to the first direction;
A drive mechanism.

[2]
A detection unit for detecting blur;
Based on the detection result in the detection unit, a drive unit that moves the movable unit to which the optical component is attached in a plane direction perpendicular to the optical axis with respect to the fixed unit so as to correct the blur,
A rolling element disposed between the movable part and the fixed part;
An urging member for pulling the movable part toward the fixed part;
A first moving member attached to the fixed portion so that one end of the biasing member can move in a first direction perpendicular to the optical axis;
A second moving member attached to the movable part such that the other end of the biasing member is movable in a second direction perpendicular to the optical axis and perpendicular to the first direction;
An image stabilization apparatus having

  DESCRIPTION OF SYMBOLS 1 ... Imaging unit, 2 ... Imaging part, 10 ... Control microcomputer, 43 ... Holder, 44 ... Fixed frame, 72a, 72b, 72c ... Spherical roller, 73a, 73b ... Hook, 74a, 74b, 74c ... Tension spring, 75, 77 ... grooves, 76a, 76b, 76c, 78a, 78b, 78c ... cylindrical rollers, 81a, 83a ... openings, 81b, 83b ... rails, 82, 84 ... recesses, O ... optical axis.

Claims (13)

A first member having a first recess;
A second member having a second recess;
A drive unit configured to move the first member along a virtual plane perpendicular to the arrangement direction with respect to the second member;
A first roller disposed in the first recess so as to restrain movement in the first direction along the virtual plane and allow movement in a second direction perpendicular to the first direction. Members,
A second roller member disposed in the second recess to restrain movement in the second direction and allow movement in the first direction; and
An urging member that is locked to each of the first roller member and the second roller member and pulls the second member and the first member toward each other;
When the first member is driven in the first direction by the driving unit, the second roller member rolls while maintaining the posture of the urging member when the driving unit is not driven. However, when the first member is driven in the second direction by the driving unit, the first roller member rolls while maintaining the posture of the urging member when the driving unit is not driven. A drive device characterized by moving.   The drive device according to claim 1, wherein the first roller member and the second roller member have a substantially cylindrical shape.   Each of the first roller member and the second roller member has a groove portion in the center portion in the axial direction thereof and a circumferential surface thereof, and the biasing member is rotatably engaged with the groove portion. The drive device according to claim 2, wherein:   The drive device according to claim 3, wherein the groove is a V-groove. The frictional force generated between the peripheral surface of the first roller member and the first member is larger than the frictional force generated between the biasing member and the groove,
4. The drive according to claim 3, wherein a frictional force generated between the peripheral surface of the second roller member and the second member is larger than a frictional force generated between the biasing member and the groove. apparatus.   2. The driving device according to claim 1, wherein each of the first roller member and the second roller member has a rubber layer on at least an outermost peripheral surface.   Each of the first roller member and the second roller member includes an engaging member that engages with one end of the biasing member, a rotating member that can rotate through the engaging member and a bearing. The drive device according to claim 1, wherein:   Each of the first contact surface where the first recess and the first roller member are in contact and the second contact surface where the second recess and the second roller member are in contact with each other is the first contact surface. The first member and the second contact surface are provided with holes for allowing the biasing member to pass therethrough, respectively, in parallel with the virtual surface when the member is moved relative to the second member. The drive device according to claim 1, wherein: It is a surface perpendicular to the first contact surface formed in the first recess that restrains the first roller member from moving in the first direction,
The surface of the second roller member that restrains the movement in the second direction is a surface perpendicular to the second contact surface formed in the second recess. 9. The drive device according to 8. The first contact surface where the first recess and the first roller member are in contact and the second contact surface where the second recess and the second roller member are in contact with each other are protruding. Or one of the engaging recesses that engage with the protruding portion is formed,
On the outer peripheral surface of each of the first roller member and the second roller member, the other of the protruding portion or the engaging recess is formed,
The protrusion and the engaging recess restrain the first roller member from moving in the first direction, and the second roller member moves in the second direction. The drive device according to claim 8, wherein: A first member having a first recess to which an optical component or an image sensor is attached;
A second member having a second recess;
A detection unit for detecting blur;
Based on the detection result in the detection unit, the drive unit that moves the first member relative to the second member in a plane direction orthogonal to the arrangement direction;
A rolling element disposed between the first member and the second member;
A first roller disposed in the first recess so that movement in the first direction along the surface direction is restricted and movement in a second direction perpendicular to the first direction is allowed. Members,
A second roller member disposed in the second recess to restrain movement in the second direction and allow movement in the first direction; and
The first roller member and the second roller member are engaged with each other, and the first member and the second member are pulled toward each other, thereby pressing the rolling elements so as to sandwich the rolling elements. An urging member,
When the first member is driven in the first direction by the driving unit, the second roller member rolls while maintaining the posture of the urging member when the driving unit is not driven. When the first member is driven in the second direction by the driving unit, the first roller member is maintained in a state in which the posture of the urging member is maintained when the driving unit is not driven. A shake correction device characterized by rolling.   12. The blur correction device according to claim 11, wherein the first roller member and the second roller member have a substantially cylindrical shape.   The coupling mechanism comprising the biasing member, the first roller member, and the second roller member is disposed at three locations on the outer periphery of the optical component or the imaging element, and the first member and the The blur correction device according to claim 12, wherein the second member is connected to the second member at three locations.

Images