JP2013038678A - Imaging system and electronic apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging system used for an electronic apparatus mainly such as a camera, a mobile phone and the electronic apparatus using the system, in which shake correction control is possible by a simple constitution.SOLUTION: In imaging system 120, a total controller 107 determines the target positions in the front and rear direction (X-axis direction) and the right and left direction (Y-axis direction) of a lens L11 on the basis of an angular velocity signal and an attitude signal, and sets a second current I2 and a third current I3 to move the lens L11 to the target positions, so that accurate shake correction is possible without using a positional sensor.

Description

  The present invention relates to an imaging system mainly used for a camera, a mobile phone, and the like and an electronic apparatus using the imaging system.

  In recent years, electronic devices such as cameras and mobile phones use an imaging system equipped with a shake correction mechanism that mechanically suppresses lens vibration in order to suppress image and image disturbance due to camera shake during shooting. Proposed.

  Such a conventional imaging system will be described with reference to FIGS.

  FIG. 6 is a system configuration diagram regarding focusing of a conventional imaging system, and FIG. 7 is a system configuration diagram regarding shake correction of the imaging system.

  Here, the imaging system 20 includes a focusing system 20A and a shake correction system 20B.

  First, in the focusing system 20 </ b> A of FIG. 6, the camera module 1 includes lenses L <b> 1 to L <b> 3 and an image sensor 2. Here, when the lens L2 moves between the lens L1 and the lens L3, the image captured by the image sensor 2 is focused.

  The focusing method will be described below.

  An image picked up by the image pickup device 2 is sent to an analog processing unit (AFE) 3 as an image signal. The signal processed by the analog processing unit (AFE) 3 is subjected to image processing by the image processing unit 4 and then stored in the image memory 5 as image data. Note that the timing generator (TG) 6 sends a timing signal to the analog processing unit (AFE) 3 and the image sensor 2, and the analog processing unit (AFE) 3 uses the timing signal to capture timing and an image signal with the image sensor 2. The timing to get is synchronized.

  The overall control unit 7 includes a shake correction control unit 7A, and is connected to a display unit 8 such as a liquid crystal display and an image recording unit 9 that stores image data in a recording medium. The image data stored in the image memory 5 is sent from the image memory 5 to the overall control unit 7 as an image signal, and an image is displayed on the display unit 8. The overall control unit 7 can store image data in the image recording unit 9.

  Further, the image processing unit 4 sends a processed image signal to the overall control unit 7. The overall control unit 7 transmits a focus command signal to the focus control unit 10 based on the processed image signal, moves the lens L2 in the optical axis direction, and performs focusing.

  Further, the overall control unit 7 sends a shutter control signal to the shutter driving unit 11. In response to the shutter control signal, the shutter drive unit 11 drives a shutter (not shown) of the camera module 1.

  Next, the shake correction system 20B of FIG. 7 will be described.

  In the figure, a shake correction system 20B includes a shake correction control unit 7A, a pitch direction gyro 21, a yaw direction gyro 22, a shutter button 23, and a camera unit 24.

  Here, the shake correction control unit 7 </ b> A is a part of the overall control unit 7. In addition, the pitch direction gyro 21 and the yaw direction gyro 22 are arranged on a circuit board (not shown) of the electronic device, as with the overall control unit 7. The shutter button 23 is disposed on a housing (not shown) of the electronic device and is pressed when an operator takes an image such as a photograph. The camera unit 24 is disposed on the circuit board of the electronic device and includes the camera module 1 and a camera shake correction mechanism 25.

  The camera shake correction mechanism 25 tilts the camera module 1 in a direction orthogonal to the position sensor 31, a first direction actuator 32 that tilts the camera module 1 in a predetermined direction, and a direction in which the first direction actuator 32 tilts. A second direction actuator 33 is provided.

  Here, processing in the shake correction control unit 7A will be described. The shake correction control unit 7A includes a shake detection circuit 41, a shake amount detection circuit 42, a coefficient conversion circuit 43, a control circuit 44, a drive circuit 45, and a sequence control circuit 46.

  Here, the shake detection circuit 41 is connected to the pitch direction gyro 21 and the yaw direction gyro 22. The pitch direction gyro 21 outputs a first angular velocity signal that is an angular velocity in the pitch direction, and the yaw direction gyro 22 outputs a second angular velocity signal that is an angular velocity in the yaw direction. The shake detection circuit 41 generates a shake signal that passes through the filter circuit and the amplification circuit for the first angular velocity signal and the second angular velocity signal, and outputs the shake signal to the shake amount detection circuit 42.

  Based on the shake signal, the shake amount detection circuit 42 calculates in which direction the camera module 1 can be tilted to correct the shake, and outputs the shake direction signal to the coefficient conversion circuit 43.

  The coefficient conversion circuit 43 multiplies the shake direction signal by a predetermined coefficient to calculate the tilt amount of the camera module 1 and outputs it to the control circuit 44 as a shake correction signal.

  The control circuit 44 outputs drive signals for driving the first direction actuator 32 and the second direction actuator 33 via the drive circuit 45.

  Note that the sequence control circuit 46 operates the shake amount detection circuit 42, the coefficient conversion circuit 43, and the control circuit 44 in response to the pressing operation of the shutter button 23.

  Then, the first direction actuator 32 and the second direction actuator 33 are driven, and the camera module 1 is tilted. The tilt amount of the camera module 1 is detected by a position sensor 31 such as a Hall element and fed back to the control circuit 44.

  Then, the control circuit 44 outputs a drive signal to the drive circuit 45 until the camera module 1 has a desired tilt direction and tilt amount.

  That is, the camera module 1 is confirmed and shake correction is performed by detecting the tilt direction and tilt amount of the camera module 1 using the position sensor 31.

  With such a configuration, the camera module 1 can be tilted so as to cancel the shake of the electronic device. As a result, camera shake can be corrected.

  As prior art document information related to the invention of this application, for example, Patent Document 1 is known.

Japanese Patent Application Laid-Open No. 2011-065580

  However, although the conventional imaging system can perform shake correction control as described above, there is a problem that it is expensive because there are many components and it takes time to assemble.

  The present invention solves such a conventional problem, and an object thereof is to realize an imaging system capable of shake correction control with a simpler configuration.

  In order to achieve the above object, the present invention determines the target position in the front-rear direction (X-axis direction) and the left-right direction (Y-axis direction) of the lens based on the angular velocity signal and the attitude signal in the overall control unit, and sets the target position. The second current and the third current for moving the lens are set.

  According to the present invention, the overall control unit determines the target position in the front-rear direction (X-axis direction) and the left-right direction (Y-axis direction) of the lens based on the angular velocity signal and the attitude signal, and moves the lens to the target position. By setting the current and the third current, it is possible to perform shake correction control without using an independent and relatively expensive position sensor such as a Hall element, thereby realizing an imaging system with a simpler configuration. I can do it.

1 is a system configuration diagram relating to focusing of an imaging system according to an embodiment of the present invention. System configuration diagram for shake correction of the imaging system An exploded perspective view of a lens actuator used in the imaging system Partial perspective view of a lens actuator used in the imaging system Partially exploded perspective view of a lens actuator used in the imaging system System configuration diagram for focusing on conventional imaging systems System configuration diagram for shake correction of the imaging system

  Embodiments of the present invention will be described below with reference to FIGS.

  Further, the same reference numerals are given to the same components as those described in the background art section.

(Embodiment)
FIG. 1 is a system configuration diagram related to focusing of an imaging system according to an embodiment of the present invention, and FIG. 2 is a system configuration diagram related to shake correction of the imaging system.

  Here, the imaging system 120 includes a focusing system 120A and a shake correction system 120B.

  First, in the focusing system 120 </ b> A of FIG. 1, the camera unit 101 includes a lens unit 102, a lens actuator 103, and an image sensor 104.

  Here, the lens unit 102 includes a lens L11 therein, and the lens actuator 103 holds the lens L11 so as to be movable in the vertical direction (Z-axis direction) that is the optical axis direction of the lens L11. The lens actuator 103 includes a first coil 105 and a magnet 106 that serve as a mechanism for moving the lens unit 102 in the vertical direction (Z-axis direction). Here, the first current I1 flows through the first coil 105, and an electromagnetic force is generated between the first coil 105 and the lens unit 102 so as to move up and down integrally with the first coil 105. The lens actuator 103 is configured.

  In addition, by moving the lens unit 102 in the vertical direction, the image captured by the image sensor 104 via the lens L11 of the lens unit 102 is focused.

  The focusing method will be described below.

  An image captured by the image sensor 104 is sent to the analog processing unit (AFE) 3 as an image signal. The signal processed by the analog processing unit (AFE) 3 is subjected to image processing by the image processing unit 4 and then stored in the image memory 5 as image data. The timing generator (TG) 6 sends a timing signal to the analog processing unit (AFE) 3 and the image sensor 104, and the analog processing unit (AFE) 3 uses the timing signal to capture the timing and image signal captured by the image sensor 104. The timing to get is synchronized.

  The overall control unit 107 is configured by a semiconductor such as a microcomputer or an ASIC (Application Specific Integrated Circuit).

  The overall control unit 107 includes a shake correction control unit 107A, and is connected to a display unit 8 such as a liquid crystal display and an image recording unit 9 that stores image data in a recording medium.

  The image data stored in the image memory 5 is sent from the image memory 5 to the overall control unit 107 as an image signal, and an image is displayed on the display unit 8. The overall control unit 107 can store image data in the image recording unit 9.

  Further, the image processing unit 4 sends a processed image signal to the overall control unit 107. The overall control unit 107 transmits a focus command signal to the focus control unit 10 based on the processed image signal, moves the lens unit 102 in the vertical direction (Z-axis direction), that is, moves the lens L11 in the optical axis direction, and focuses. I do.

  Further, the overall control unit 107 sends a shutter control signal to the shutter drive unit 11. In response to the shutter control signal, the shutter drive unit 11 drives a shutter (not shown) of the camera unit 101.

  Next, the shake correction system 120B of FIG. 2 will be described.

  In the figure, a shake correction system 120B includes a shake correction control unit 107A, a pitch direction gyro 21 and a yaw direction gyro 22, a shutter button 23, a camera unit 101, and an attitude sensor 122.

  Here, the shake correction control unit 107 </ b> A is a part of the overall control unit 107. The pitch direction gyro 21, the yaw direction gyro 22, and the attitude sensor 122 are arranged together with the overall control unit 107 on a circuit board (not shown) of the electronic device. The shutter button 23 is disposed on a housing (not shown) of the electronic device and is pressed when an operator takes an image such as a photograph.

  The pitch direction gyro 21 detects the angular velocity in the pitch direction and outputs a first angular velocity signal that becomes the angular velocity in the pitch direction. The yaw direction gyro 22 detects the angular velocity in the yaw direction and outputs a second angular velocity signal.

  Further, the posture sensor 122 is, for example, a triaxial acceleration sensor, and a posture signal to be output changes in accordance with a change in posture of the electronic device on which the posture sensor 122 is mounted.

  The camera unit 101 is disposed on a circuit board of an electronic device, and includes a lens unit 102, a lens actuator 103, and an image sensor 104.

  The lens actuator 103 includes a second coil 108 and a third coil 109 in addition to the first coil 105 and the magnet 106 described in the focusing system 120A.

  Here, a camera shake correction mechanism 110 is configured by the magnet 106, the second coil 108, and the third coil 109. The magnet 106 and the second coil 108 face each other in the front-rear direction (X-axis direction), and the magnet 106 and the third coil 109 face each other in the left-right direction (Y-axis direction).

  The first coil 105, the magnet 106, and the lens unit 102 are integrally configured as a movable block 118.

  In the lens actuator 103, when the second current I2 is passed through the second coil 108, the movable block 118 is moved in the front-rear direction (X-axis direction) by the electromagnetic force generated between the second coil 108 and the magnet 106. Moving. When the third current I3 is passed through the third coil 109, the movable block 118 moves in the left-right direction (Y-axis direction) by the electromagnetic force generated between the third coil 109 and the magnet 106.

  Next, processing in the shake correction control unit 107A will be described.

  The shake correction control unit 107A includes a shake detection circuit 111, a shake amount detection circuit 112, a coefficient conversion circuit 113, a current setting circuit 114, a drive circuit 115, and a sequence control circuit 116.

  Here, the shake detection circuit 111 is connected to the pitch direction gyro 21 and the yaw direction gyro 22.

  The shake detection circuit 111 receives a first angular velocity signal from the pitch direction gyro 21 and a second angular velocity signal from the yaw direction gyro 22. Then, based on the first angular velocity signal and the second angular velocity signal, a shake signal passing through a filter circuit and an amplifier circuit is generated and output to the shake amount detection circuit 112.

  The shake amount detection circuit 112 calculates, based on the shake signal, whether the movable block 118 can be moved in the front, back, left, and right (in the XY plane) to correct the shake, and outputs the shake direction signal to the coefficient conversion circuit 113. To do.

  The coefficient conversion circuit 113 multiplies the shake direction signal by a predetermined coefficient to calculate the amount of movement of the movable block 118 and outputs it to the current setting circuit 114 as a shake correction signal.

  The current setting circuit 114 sets the current values of the second current I2 and the third current I3 that flow through the second coil 108 and the third coil 109 via the drive circuit 115, and outputs a current value signal. . Here, the current setting circuit 114 is connected to the attitude sensor 122, and an attitude signal is input from the attitude sensor 122. Based on the attitude signal and the shake correction signal input from the coefficient conversion circuit 113, a target position for operating the lens L11 in the front-rear direction (X-axis direction) and the left-right direction (Y-axis direction) is determined. Then, the current setting circuit 114 sets the current values of the second current I2 and the third current I3 that move the lens L11 to the target position, and outputs a current value signal to the drive circuit 115. The current values of the second current I2 and the third current I3 have a one-to-one correspondence with the target positions in the front-rear direction (X-axis direction) and the left-right direction (Y-axis direction) of the movable block 118 that holds the lens L11. doing.

  The sequence control circuit 116 operates the shake amount detection circuit 112, the coefficient conversion circuit 113, and the current setting circuit 114 in response to the pressing operation of the shutter button 23.

  Based on the current value signal input from the current setting circuit 114, the drive circuit 115 supplies the second current I2 to the second coil 108 and the third current I3 to the third coil 109.

  When the second current I2 flows through the second coil 108 and the third current I3 flows through the third coil 109, the lens L11 held by the movable block 118 moves in the front-rear direction (X-axis direction), respectively. Move in the left-right direction (Y-axis direction).

  That is, the overall control unit 107 determines a target position in the front-rear direction (X-axis direction) and the left-right direction (Y-axis direction) of the lens L11 based on the angular velocity signal and the attitude signal, and moves the lens L11 to the target position. Since the current I2 and the third current I3 are set, highly accurate shake correction can be performed without using a position sensor.

  Note that when the posture signal of the posture sensor 122 changes, the image such as the direction of the image displayed on the display unit 8 of the imaging system 120 changes. That is, the attitude signal of the attitude sensor 122 is used for both shake correction control and display control for detecting the attitude of the electronic device on which the imaging system 120 is mounted and changing the display on the display unit 8. . For this reason, it is possible to perform highly accurate shake correction by sharing the posture sensor 122 that has been conventionally used for display control with shake correction control, particularly for electronic devices that use the posture sensor 122 for display control. It has a configuration.

  Note that the shake detection circuit 111, the shake detection circuit 112, the coefficient conversion circuit 113, the current setting circuit 114, the drive circuit 115, and the sequence control circuit 116 may be recorded in the overall control unit 107 as software such as a program. Alternatively, it may be configured as hardware such as a logic circuit.

  Here, in the shake correction system 120B, the current setting circuit 114 determines a target position with respect to a predetermined reference position of the movable block 118, and sets the second current I2 and the third current I3.

  The reference position of the movable block 118 is set such that, for example, when the power of the electronic device is turned on, the second coil 108 and the third coil 109 are supplied with the second current I2, the third coil 109, respectively. This is done by passing a current I3. By passing a current through the second coil 108 and the third coil 109 for a predetermined time, the movable block 118 becomes an end in the front-rear direction (X-axis direction) and the left-right direction (Y-axis direction) within the movable range. The end position is reached.

  As a result, it is possible to prevent accumulation of errors caused by the estimation of the moving amount of the movable block 118 when using the electronic device.

  A specific configuration of the lens actuator 103 used in the imaging system 120 configured as described above will be described with reference to FIGS.

  3 is an exploded perspective view of the lens actuator 103 used in the imaging system 120, and FIG. 4 is a partial perspective view with the upper cover 136 and the flexible printed wiring board 135 removed.

  Here, the lens actuator 103 includes a movable unit 131, a coil unit 132, a lower cover 133, shafts 134A to 134D, a flexible printed wiring board 135, and an upper cover 136.

  First, the configuration of the movable unit 131 will be described. Here, FIG. 5 is a partially exploded perspective view of the movable unit 131.

  As can be seen from the exploded perspective view of FIG. 5, the movable unit 131 includes a lens holder 141, a magnet holder 142, a lower spring 143, and an upper spring 144. The movable unit 131 is obtained by removing the lens unit 102 from the configuration of the movable block 118.

  The lens holder 141 includes a carrier 145 and first coils 105 </ b> A and 105 </ b> B arranged on the outer periphery of the carrier 145 in two upper and lower stages. The first coils 105 </ b> A and 105 </ b> B correspond to the first coil 105.

  Here, the carrier 145 has a rectangular cylindrical shape with a circular hole 145A at the center, and is formed of an insulating resin such as polycarbonate with glass.

  The first coils 105A and 105B are formed by winding a coil wire such as an enamel wire having a wire diameter of Φ40 μm to Φ60 μm around a carrier 145 with the upper direction as an axis.

  The magnet holder 142 includes a holder 147, magnets 148A to 148D, and magnets 149A to 149D. Magnets 148A to 148D and magnets 149A to 149D are examples of the magnet 106.

  Here, the holder 147 is a rectangular cylinder having a square hole 147A at the center, and is formed of an insulating resin such as glass-filled polycarbonate. Further, a holder-side rim portion 147B projecting in all directions is provided on the bottom surface of the holder 147, and a holder-side locking portion 147C is provided as a substantially V-shaped groove on the holder-side rim portion 147B.

  Further, on the side surfaces of the holder 147 in the front-rear and left-right directions, a slightly larger magnet 148A to 148D having a rectangular parallelepiped shape and a slightly smaller magnet 149A to 149D having a rectangular parallelepiped shape have magnets 148A to 148D upward and magnets 149A to 149D downward. And are fixed with an adhesive (not shown) or the like.

  Here, the magnets 148A to 148D and the magnets 149A to 149D are magnetized so that the magnetic poles on the inner side surfaces are different from each other, and the magnetic poles on the outer side side are also different from each other. Is so magnetized. As a result, the magnetic fields generated by the magnets 148A to 148D and the magnets 149A to 149D are not inhibited, and a strong magnetic field can be generated.

  For example, the inner surfaces of the magnets 148A to 148D are magnetized with the S pole, and the inner surfaces of the magnets 149A to 149D are magnetized with the N pole. Accordingly, the outer surfaces of the magnets 148A to 148D are magnetized with the N pole, and the outer surfaces of the magnets 149A to 149D are magnetized with the S pole.

  And the lens holder 141 is accommodated in the square hole 147A of the holder 147, and the first coils 105A and 105B are opposed to the magnets 148A to 148D and the magnets 149A to 149D.

  That is, in the movable unit 131, when the first current I1 flows through the first coils 105A and 105B, electromagnetic force is generated between the magnets 148A to 148D and the magnets 149A to 149D, and the lens holder 141 is applied to the magnet holder 142. On the other hand, it is configured to move up and down.

  The lower spring 143 is a conductive metal leaf spring in which an outer peripheral portion 143A and an inner peripheral portion 143B are connected by a plurality of meandering spring portions 143C. The upper spring 144 is also a conductive metal leaf spring in which the outer peripheral portion 144A and the inner peripheral portion 144B are connected by a plurality of meandering spring portions 144C.

  The outer peripheral portion 143A and the outer peripheral portion 144A are fixed to the magnet holder 142, and the inner peripheral portion 143B and the inner peripheral portion 144B are fixed to the lens holder 141. Accordingly, when the first current I1 does not flow through the first coils 105A and 105B, the lens holder 141 can be returned to a predetermined position with respect to the magnet holder 142.

  That is, the movable unit 131 causes the lens holder 141 to move up and down relative to the magnet holder 142 by passing the first current I1 through the first coils 105A and 105B, or the weight of the lens holder 141 and the lower spring 143, The lens holder 141 is stopped by balancing the spring force of the upper spring 144 and the electromagnetic force. When the first current I1 does not flow through the first coils 105A and 105B, the lens holder 141 returns to a predetermined position with respect to the magnet holder 142.

  Next, components other than the movable unit 131 will be described with reference to FIGS. 3 and 4.

  Here, the coil unit 132 includes a base 151, second coils 108A and 108B, and third coils 109A and 109B. The base 151 is a rectangular cylinder having a square hole 151A in the center, and is formed of an insulating resin or the like. In addition, T-shaped grooves 151B are provided on the front, rear, left and right side walls, and a plurality of base-side rim portions 151C projecting in four directions are provided on the upper surface, and holes 151D are provided in each of the base-side rim portions 151C. The second coils 108A and 108B and the third coils 109A and 109B correspond to the second coil 108 and the third coil 109, respectively.

  The second coils 108A and 108B and the third coils 109A and 109B are fixed to the upper half of the groove 151B with an adhesive (not shown) or the like. The second coils 108A and 108B and the third coils 109A and 109B are formed by winding a coil wire having a wire diameter of Φ40 μm to Φ60 μm around the front-rear direction (X-axis direction) or the left-right direction (Y-axis direction). Is done.

  The shafts 134A to 134D are conductive metal shafts. Here, the movable unit 131 is accommodated in the square hole 151A of the base 151, the upper ends of the shafts 134A to 134D are locked to the hole 151D of the base 151, and the lower end is locked to the holder side locking portion 147C of the holder 147. It is locked. The movable unit 131 is accommodated in the square hole 151A of the base 151 so that the magnets 148A to 148D are opposed to the second coils 108A and 108B and the third coils 109A and 109B.

  That is, the movable unit 131 is connected to the coil unit 132 via the shafts 134A to 134D, and the shafts 134A to 134D maintain the movable unit 131 horizontal in the front, rear, right and left (in the XY plane) within the coil unit 132. It is configured to be movable.

  The flexible printed wiring board 135 is a flexible flexible printed wiring board provided with a connector 161 having a plurality of terminals on the end surface, and a plurality of wirings (not shown) are disposed therein. Then, it is folded three-dimensionally and further bent along the four sides of the base 151.

  The first coils 105A and 105B are electrically connected to terminals provided on the connector 161 of the flexible printed wiring board 135 via a lower spring 143, an upper spring 144, shafts 134A to 134D, and the like. Further, the end portions of the coil wires constituting the second coils 108A and 108B and the third coils 109A and 109B are connected to the flexible printed wiring board 135 so as to be provided on the connector 161 of the flexible printed wiring board 135. Second coils 108A and 108B and third coils 109A and 109B are electrically connected to the terminals.

  That is, the first coils 105A and 105B, the second coils 108A and 108B, and the third coils 109A and 109B are connected to the second current I2 and the third current through the terminals provided on the connector 161, respectively. I3 is made to flow.

  The lower cover 133 is a metal plate formed of a nonmagnetic material such as aluminum or white and white with a circular hole 133A in the center. The lower cover 133 is bonded to the lower surface of the base 151 with an adhesive (not shown). It is fixed with etc.

  The upper cover 136 has a circular hole 136A at the center, and is formed of a nonmagnetic material such as aluminum or white or white in a rectangular box shape with an open bottom surface. The upper cover 136 accommodates the movable unit 131, the coil unit 132, the shafts 134A to 134D, and the flexible printed wiring board 135 between the lower cover 133 and is fixed to the lower cover 133 by welding or the like. The circular hole 136A, the circular hole 145A, and the circular hole 133A are continuous, and a through hole is formed from the upper surface to the lower surface of the lens actuator 103.

  That is, the lens actuator 103 is provided with the magnets 148A to 148D facing the first coil 105A, the second coils 108A and 108B, and the third coils 109A and 109B. The first current I1 is supplied to move the carrier 145 in the vertical direction, the second current I2 is supplied to the second coils 108A and 108B to move the movable unit 131 in the front-rear direction (X-axis direction), the third coil 109A, A third current I3 is supplied to 109B to move the movable unit 131 in the left-right direction (Y-axis direction).

  In the above description, the lens unit 102 has been described as including a single lens L11. However, the lens unit 102 may be configured as including a plurality of lenses.

  In addition, the pitch direction gyro 21 and the yaw direction gyro 22 may be configured as a single component with a biaxial angular velocity sensor, or may be configured as separate components with a uniaxial angular velocity sensor.

  In the above description, the imaging system 120 is described as capturing an image that is a still image. However, the present invention can be implemented even when capturing an image that is a moving image.

  In the above description, the acceleration sensor is described as an example of the attitude sensor, but the present invention is not limited to this. Here, the posture sensor is a sensor that detects in what posture the device is held with respect to gravity. For example, the posture sensor detects a posture angle, and the posture angle is defined as a relative angle with respect to the direction of gravity. More specifically, the posture angle is, for example, an angle formed by the optical axis direction of the lens and the gravity direction.

  As an example of the posture sensor other than the acceleration sensor, one having a structure in which the weight rolls to a position corresponding to the posture can be considered. A structure having a structure for detecting the posture by detecting the position of the weight with, for example, an optical sensor is also conceivable.

  As another example of the posture sensor structure, a pendulum made of a magnetic material is incorporated inside, and a magnetic circuit is composed of a magnet and a pendulum fixed on the back of the component, and the magnetic field when the position of the pendulum changes. A structure in which the posture is detected by detecting a change in the direction of the position with a Hall element or the like can be considered.

  In the above description, the movable unit 131 is held by the shafts 134A to 134D as the lens actuator 103, but another holding method may be used. For example, a method of holding the movable unit 131 with an ultrasonic motor is also conceivable.

  Moreover, although the example which uses electromagnetic force as an actuator which moves the movable unit 131 was shown, for example, an actuator of another structure, such as an ultrasonic motor, a piezo actuator, a shape memory alloy actuator, an actuator using electrostatic force, and a polymer actuator Can be used.

  Further, a method of providing a position detection sensor in the lens actuator 103 and performing camera shake correction control by feedback control is also conceivable. According to this, it is possible to accurately grasp whether or not the movable unit 131 has reached the target position by feedback control.

  Further, the current values of the second current I2 and the third current I3 have been described as having a one-to-one correspondence with the target position of the lens L11. However, the second current I2 and the third current I3 are movable speeds. , It may be determined whether the lens L11 has moved to the target position by multiplying the time during which the second current I2 and the third current I3 are flowing.

  As described above, according to the present embodiment, in the imaging system 120, the overall control unit 107 has the target position of the lens L11 in the front-rear direction (X-axis direction) and the left-right direction (Y-axis direction) based on the angular velocity signal and the attitude signal. And the second current I2 and the third current I3 for moving the lens L11 to the target position are set, so that it is possible to perform highly accurate shake correction without using a position sensor. Yes.

  In addition, since an acceleration sensor is used as the posture sensor 122, it is possible to detect a change in posture of the electronic device with higher accuracy.

  Further, as the reference position of the lens L11, the second current I2 and the third current I3 are passed through the lens actuator 103 for a predetermined time, and the end position where the lens L11 moves is used. In addition, it is possible to prevent accumulation of errors caused by the estimation of the movement amount of the lens L11.

  Then, when the posture signal of the posture sensor 122 included in the imaging system 120 changes, the electronic device is configured such that the image or video displayed on the display unit 8 changes, so that the shake correction control and the imaging system 120 are mounted. The posture signal of the posture sensor 122 can be shared for both the display control that detects the posture of the electronic device and changes the display of the display unit 8, and realizes good shake correction control and display control with a simple configuration. sell.

  The imaging system according to the present invention and an electronic apparatus using the imaging system can perform shake correction control with a simpler configuration, and are useful mainly for lens operations of cameras, mobile phones, and the like.

DESCRIPTION OF SYMBOLS 3 Analog processing part 4 Image processing part 5 Image memory 6 Timing generator 8 Display part 9 Image recording part 10 Focus control part 11 Shutter drive part 21 Pitch direction gyro 22 Yaw direction gyro 23 Shutter button 101 Camera unit 102 Lens unit 103 Lens actuator 104 Image sensor 105, 105A, 105B First coil 106, 148A-148D, 149A-149D Magnet 107 Overall control unit 107A Shake correction control unit 108, 108A, 108B Second coil 109, 109A, 109B Third coil 110 Camera shake Correction mechanism 111 shake detection circuit 112 shake detection circuit 113 coefficient conversion circuit 114 current setting circuit 115 drive circuit 116 sequence control circuit 118 movable block 120 Imaging system 120A Focusing system 120B Vibration correction system 122 Attitude sensor 131 Movable unit 132 Coil unit 133 Lower cover 133A, 136A, 145A Circular hole 134A-134D Shaft 135 Flexible printed wiring board 136 Upper cover 141 Lens holder 142 Magnet holder 143 Lower spring 143A, 144A Outer peripheral part 143B, 144B Inner peripheral part 143C, 144C Spring part 144 Upper spring 145 Carrier 147 Holder 147A Square hole 147B Holder side rim part 147C Holder side locking part 151 Base 151A Square hole 151B Groove 151C Base side rim part 151C Hole 161 connector

Claims (4)

A lens that is movable in three orthogonal directions, and a lens that holds the lens and moves the lens in the Z-axis direction when a first current is passed, and moves in the X-axis direction when a second current is passed. A lens actuator that moves in the Y-axis direction when flowing, a general control unit electrically connected to the lens actuator, an angular velocity sensor connected to the general control unit and outputting an angular velocity signal, and connected to the general control unit A posture sensor that outputs a posture signal, and the overall control unit determines a target position in the X-axis direction and the Y-axis direction of the lens based on the angular velocity signal and the posture signal, and moves the lens to the target position. An imaging system for setting the second current and the third current. The imaging system according to claim 1, wherein the posture sensor is an acceleration sensor. The imaging system according to claim 1, wherein an end position at which the lens moves by passing the second current and the third current for a predetermined time is used as the reference position of the lens. An electronic apparatus comprising: the imaging system according to claim 1; and a display unit that displays an image or a video, wherein the image or video displayed on the display unit changes when a posture signal of the posture sensor included in the imaging system changes.

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