JP2010107894A - Position signal correcting circuit and voice coil motor drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the driving accuracy of a voice coil motor, by adding a position signal and an opposite phase of an attenuated control signal input from a signal attenuation part and outputting what is obtained by addition as a control signal. <P>SOLUTION: A position signal correcting circuit 40 of the voice coil motor drive device includes an addition part 41, in which the position signal showing a position of a position detection sensor, provided at the center or in the vicinity of the coil of the voice coil motor, according to a sensor signal output from the position detection sensor is input and which outputs the control signal for controlling the driving of the voice coil motor; and the signal attenuating part 42 which attenuates the control signal output from an addition part 41. The addition part 41 adds the position signal and the opposite phase of the attenuated control signal input from the signal attenuation part 42 and outputs what is obtained by addition as the control signal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a position signal correction circuit and a voice coil motor driving device.

  2. Description of the Related Art Conventionally, a photographing apparatus such as a digital still camera provided with a voice coil motor driving device that drives a voice coil motor to perform camera shake correction is known. The voice coil motor driving device includes a voice coil motor that moves an image sensor and a position detection sensor that detects a position changed by camera shake. The voice coil motor includes a magnet and a coil. The position detection sensor includes a Hall element for position detection of the position detection sensor (imaging device). The imaging element, the coil of the voice coil motor, and the hall element of the position detection sensor each have a configuration that is integrally movable with respect to the magnet. The voice coil motor driving device drives the voice coil motor in accordance with the position signal of the position detection sensor based on the sensor signal detected by the position detection sensor, and moves the image sensor in the direction for correcting the camera shake.

In addition, an imaging apparatus that has been reduced in size by arranging a Hall element in the center of a voice coil motor has been considered (see, for example, Patent Document 1).
JP 2005-292799 A

  However, in the conventional imaging device, when the frequency of the drive signal of the voice coil motor is in the high frequency region, the position detection sensor is affected by the magnetic field generated from the coil, and the sensor signal is not operated. The same output waveform as the drive signal of the coil was put on.

  As a result, when the round-trip transmission characteristics of the voice coil motor driving device are measured, the gain on the high frequency side is raised, and even if phase compensation is performed, there is no point where the phase becomes −180 °, so oscillation occurs and control cannot be achieved. It was. In order to prevent the gain from rising, a configuration in which a low-pass filter is added to the voice coil motor driving device is also conceivable. However, the voice coil motor driving device to which the low-pass filter is added has a problem that the gain intersection cannot be increased because the gain also decreases. In the voice coil motor driving apparatus, it is known that the higher the gain, the higher the follow-up performance of the voice coil motor. Therefore, in the conventional voice coil motor driving device, the driving accuracy of the voice coil motor cannot be increased.

  The subject of this invention is improving the drive precision of a voice coil motor.

In order to solve the above-described problem, a position signal correction circuit according to a first aspect of the present invention includes:
Control for driving control of the voice coil motor by inputting a position signal indicating the position of the position detection sensor in accordance with a sensor signal output from a position detection sensor provided at or near the center of the coil of the voice coil motor. An adder for outputting a signal;
A signal attenuating unit for attenuating the control signal output from the adding unit,
The adder adds the position signal and the reverse phase of the attenuated control signal input from the signal attenuator, and outputs the result as the control signal.

A voice coil motor driving device according to a second aspect of the present invention comprises:
A position signal correction circuit according to claim 1;
The voice coil motor;
The position detection sensor;
A position signal generation circuit that generates a position signal indicating the position of the position detection sensor in response to a sensor signal output from the position detection sensor;
A phase compensation circuit for phase compensating the control signal output from the signal correction circuit or the position signal output from the position signal generation circuit;
A voice coil motor drive circuit that amplifies the control signal phase-compensated by the phase compensation circuit and outputs it to the voice coil motor as a drive signal;
The position signal correction circuit corrects the position signal output from the position signal generation circuit or the phase compensation circuit and outputs it as a control signal.

According to a third aspect of the present invention, in the voice coil motor driving device according to the second aspect,
The voice coil motor driving device is provided in an imaging device having an imaging element,
The voice coil motor moves the image sensor according to the drive signal,
The position detection sensor is movable together with the image sensor, detects a position of the position detection sensor with respect to the imaging device, and outputs a sensor signal;
The position signal generation circuit generates a position signal of the position detection sensor for causing the position of the position detection sensor to follow the position of the imaging device that has been changed due to camera shake in accordance with the sensor signal.

  According to the present invention, the driving accuracy of the voice coil motor can be increased.

  Exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the illustrated example. The embodiment of the present invention represents the most preferable embodiment of the invention, and the use and terms of the invention are not limited to this.

  First, the device configuration of the present embodiment will be described with reference to FIGS. FIG. 1 shows a configuration of a voice coil motor (hereinafter referred to as VCM) driving apparatus 1 according to the present embodiment.

  The VCM driving device 1 according to the present embodiment is provided in an imaging device such as a digital still camera or an imaging unit of a portable device. The VCM driving device 1 is a device for correcting camera shake of the imaging device.

  As shown in FIG. 1, the VCM drive device 1 includes a VCM 10, a position detection sensor 20, a position signal generation circuit 30, a position signal correction circuit 40, a phase compensation circuit 50, and a VCM drive circuit 60. .

  The VCM driving device 1 detects the position of the position detection sensor 20 corresponding to the image sensor, and drives the VCM 10 so as to move the image sensor in a direction that reduces camera shake based on the detected position signal. . The imaging element is moved on a plane, for example. For this reason, the VCM driving device 1 is provided in each direction so as to move the imaging element in the direction of two axes (X and Y axes) on the plane.

  The VCM 10 is a drive motor for moving the image sensor. The VCM 10 receives the drive signal output from the VCM drive circuit 60 and moves the image sensor in accordance with the drive signal. The position detection sensor 20 detects the position (relative position) of the position detection sensor 20 with respect to the position of the imaging device (magnet 12 described later), and outputs a sensor signal as an electrical signal corresponding to the detected position. The position detection sensor 20 has two input terminals and two output terminals. The sensor signal is an output signal of each of the two output terminals of the position detection sensor 20. The position signal generation circuit 30 receives the sensor signal output from the position detection sensor 20, and generates and outputs a position signal indicating the position of the position detection sensor 20 for camera shake correction based on the sensor signal.

  The position signal generation circuit 30 causes the position detection sensor 20 to cause the position of the position detection sensor 20 corresponding to the sensor signal to follow the position of the imaging device (magnet 12 to be described later) that has changed due to camera shake from the input sensor signal. A position signal indicating the position of is generated. The position signal generation circuit 30, for example, a signal difference amplification circuit that amplifies the signal difference between the input sensor signals and a signal difference signal amplified by the signal difference amplification circuit is amplified and output as a position signal. A differential amplifier circuit.

  The position signal correction circuit 40 receives the position signal output from the position signal generation circuit 30, corrects the position signal, and outputs the position signal as a control signal for driving control of the VCM 10. The phase compensation circuit 50 receives the control signal output from the position signal correction circuit 40, and compensates and outputs the phase of the control signal. The position signal correction circuit 40 and the phase compensation circuit 50 will be described in detail later. The VCM drive circuit 60 receives the compensated control signal output from the phase compensation circuit 50, amplifies the compensation signal, and outputs the amplified signal to the VCM 10 as a drive signal.

  FIG. 2 shows the positional relationship between the position detection sensor 20 and the coil 11 of the VCM 10. FIG. 3 shows a cross-sectional configuration of the VCM 10. As shown in FIGS. 2 and 3, the VCM 10 includes a coil 11, a magnet 12, and a yoke 13. The coil 11 is provided on the substrate B. As shown in FIG. 2, the coil 11 is formed in a substantially elliptical shape on the plane of the substrate B, for example. The drive signal output from the VCM drive circuit 60 is input to the coil 11. The substrate B is provided with an image sensor and is movable in the plane direction. A position detection sensor 20 is provided on the substrate B. The magnet 12 is fixedly provided in the imaging device.

  In FIG. 3, the left-right direction is the drive direction of the substrate B (imaging device). The magnet 12 is provided on the coil 11 so as to be separated. The magnet 12 is composed of two magnet portions whose magnetic field directions are opposite with respect to the center of the coil 11. For this reason, a different magnetic field is obtained according to the position of the magnet 12 in the left-right direction. The yoke 13 is made of a magnetic material, and is a member that reduces the leakage magnetic flux of the magnet 12 and effectively uses the magnetic flux. When a drive signal is passed through the coil 11 in the magnetic field of the magnet 12, a force acts on the coil 11 that is a conductor. That is, when a force is applied to the coil 11, the image pickup device and the position detection sensor 20 move together with the coil 11 together with the substrate B.

  The position detection sensor 20 is configured by a Hall element and outputs a sensor signal corresponding to the position of the position detection sensor 20. As shown in FIGS. 2 and 3, the position detection sensor 20 is provided on the substrate B, and is provided at the central portion of the coil 11 (the axial central portion of the winding of the coil 11) on a plane on the substrate B. As described above, the position detection sensor 20 is provided at the center of the coil 11, whereby the VCM driving device 1 (imaging device) can be downsized. Further, the position detection sensor 20 generates an electric signal due to the Hall effect generated according to the magnetic field corresponding to the position (relative position) with respect to the magnet 12 (imaging device) according to the relative position of the position detection sensor 20 with respect to the position of the magnet 12. Output as a sensor signal.

  FIG. 4 shows magnetic force lines output from the coil 11. As shown in FIG. 4, the coil 11 outputs magnetic lines of force in response to a drive signal that flows. For this reason, the position detection sensor 20 outputs a sensor signal corresponding to the magnetic field generated from the magnet 12 and the coil 11. In particular, when the drive signal becomes a high frequency, the influence of the lines of magnetic force from the coil 11 increases on the position detection sensor 20. The position signal correction circuit 40 corrects the position signal to remove the influence of the magnetic force lines from the coil 11 on the position detection sensor 20. The position detection sensor 20 may be provided at a position in the vicinity of the coil 11 that is affected by the lines of magnetic force from the coil 11.

  FIG. 5 shows an internal configuration of the position signal correction circuit 40. As shown in FIG. 5, the position signal correction circuit 40 includes an addition unit 41 and a signal attenuation unit 42. The adder 41 receives the position signal output from the position signal generation circuit 30 and the control signal attenuated by the signal attenuator 42, and adds the position signal and the opposite phase of the attenuated control signal. And output as a control signal. The signal attenuator 42 receives the control signal output from the adder 41, attenuates this control signal by 1 / α (α: constant), and outputs (feeds back) to the adder 41. In this manner, the position signal correction circuit 40 removes the influence of the magnetic lines of force from the coil 11 on the position detection sensor 20 from the position signal.

  FIG. 6 shows the configuration of the signal correction compensation circuit 40A. The signal correction compensation circuit 40A shown in FIG. 6 is an example of a specific circuit in which the position signal correction circuit 40 and the phase compensation circuit 50 are combined. The signal correction compensation circuit 40A includes a resistor 51, a capacitor 52, a resistor 53, an operational amplifier 54, a resistor 55, a capacitor 56, a resistor 43, an operational amplifier 44, a resistor 45, a resistor 46, and an operational amplifier 47. .

  In FIG. 6, input terminals In 1 and In 2 are connected to two output terminals of the signal difference amplifier circuit of the position signal generation circuit 30. The input terminal In1 is connected to the + input terminal of the operational amplifier 47 through the resistor 31. The + input terminal of the operational amplifier 47 is grounded via the resistor 33. The input terminal In2 is connected to the negative input terminal of the operational amplifier 47 through the resistor 32. The output terminal of the operational amplifier 47 is connected to the negative input terminal of the operational amplifier 47 through the resistor 48. Thus, the resistors 31 and 32, the resistor 33, the operational amplifier 47, and the resistor 48 function as a differential amplifier circuit of the position signal generation circuit 30.

  The output terminal of the operational amplifier 47 is connected to the negative input terminal of the operational amplifier 54 via the resistor 51. The input terminal of the signal correction compensation circuit 40A is connected to the negative input terminal of the operational amplifier 54 through the capacitor 52 and the resistor 53 in this order. The + input terminal of the operational amplifier 54 is grounded. The output terminal of the operational amplifier 54 is connected to the negative input terminal of the operational amplifier 54 through a resistor 55. The output terminal of the operational amplifier 54 is connected to the negative input terminal of the operational amplifier 54 via the capacitor 56. Further, the output terminal of the operational amplifier 54 is the output terminal OUT of the signal correction compensation circuit 40A.

  The output terminal of the operational amplifier 54 is connected to the negative input terminal of the operational amplifier 44 through the resistor 43. The + input terminal of the operational amplifier 44 is grounded. The output terminal of the operational amplifier 44 is connected to the negative input terminal of the operational amplifier 44 through the resistor 45. The output terminal of the operational amplifier 44 is connected to the negative input terminal of the operational amplifier 47 through the resistor 46.

  In the signal correction compensation circuit 40A, the phase compensation circuit 50 is configured by the resistor 51, the capacitor 52, the resistor 53, the operational amplifier 54, the resistor 55, and the capacitor 56. The phase compensation circuit 50 is composed of, for example, a combination of a low pass filter and a high pal filter. Specifically, the resistor 51, the operational amplifier 54, and the capacitor 56 constitute an integration circuit and function as a low-pass filter. The capacitor 52, the resistor 53, the operational amplifier 54, and the resistor 55 constitute a differentiation circuit and function as a high-pass filter.

  FIG. 7A shows an example of the gain characteristic with respect to the frequency of the phase compensation circuit 50. FIG. 7B shows an example of the phase characteristic with respect to the frequency of the phase compensation circuit 50. As shown in FIGS. 7A and 7B, the phase compensation circuit 50 has a gain characteristic in which the gain in the low frequency region and the high frequency region is substantially constant with respect to the frequency, and the frequency is 100 [Hz] with respect to the frequency. And a phase characteristic having a phase peak at a degree. The phase here is the phase difference of the input signal from the output signal.

  Further, in the signal correction compensation circuit 40A of FIG. 6, the position signal correction circuit 40 is configured by the resistor 43, the operational amplifier 44, the resistors 45 and 46, the operational amplifier 47, and the resistor 48. Specifically, the resistor 43, the operational amplifier 44, and the resistor 45 function as an inverting amplifier circuit (signal attenuation unit 42). The resistor 46, the operational amplifier 47, and the resistor 48 function as an adder circuit (adder 41) for the output signal of the operational amplifier 44 and the input signal of the input terminal In2. The resistance values of the resistors 46 and 48 are the same. Further, assuming that the resistance values of the resistors 43 and 45 are R1 and R2, respectively, R2 / R1 = 1 / α. Thus, the constant α is determined by the resistance values of the resistors 43 and 45. For example, the resistance values of the resistors 43 and 45 are R1 = 560 [kΩ] and R2 = 200 [kΩ].

  In the example of FIG. 6, the position signal correction circuit 40 and the phase compensation circuit 50 are the signal correction compensation circuit 40A configured by one analog circuit. However, the present invention is not limited to this. For example, in the signal correction compensation circuit 40A, the output terminal of the operational amplifier 47 may be connected to the input terminal of the position signal correction circuit 40. In this case, the position signal correction circuit 40 is configured by a non-inverting amplifier circuit. . Further, the position signal correction circuit 40 and the phase compensation circuit 50 may be configured by separate analog circuits. Further, the position signal correction circuit 40 and the phase compensation circuit 50 may be interchanged. In this case, the position signal output from the position signal generation circuit 30 is phase-compensated by the phase compensation circuit 50, and the phase-compensated position signal is corrected by the position signal correction circuit 40 and output as a control signal. Furthermore, the position signal correction circuit 40 may be configured by a digital addition circuit such as a DSP (Digital Signal Processor).

  Next, the operation of the VCM driving apparatus 1 will be described with reference to FIGS. FIG. 8 shows the gain and phase characteristics with respect to frequency in the VCM 10.

  As shown in FIG. 8, the VCM 10 has a gain characteristic (solid line in the figure) in which the gain decreases with a constant slope with respect to the frequency, and a phase characteristic (phase in FIG. Upper dotted line).

  FIG. 9 shows gain and phase characteristics with respect to frequency in the VCM driving apparatus 1 excluding the position signal correction circuit 40 and the phase compensation circuit 50. FIG. 10 shows gain and phase characteristics with respect to frequency in the VCM driving apparatus 1 excluding the phase compensation circuit 50. As shown in FIG. 9, the VCM driving apparatus 1 excluding the position signal correction circuit 40 and the phase compensation circuit 50 has a frequency of about 200 with respect to the frequency as a characteristic corresponding to the phase compensation and signal correction in the VCM driving apparatus 1. A gain characteristic (solid line in the figure) that suddenly rises without decreasing the gain from [Hz], and a phase characteristic (dotted line in the figure) in which the phase rapidly advances at a frequency of about 200 [Hz] with respect to the frequency. Have. This is because, as described with reference to FIG. 4, when the drive signal is in a high frequency region, the influence of the magnetic lines of force from the coil 11 increases on the position detection sensor 20.

  As shown in FIG. 10, the VCM driving device 1 except for the phase compensation circuit 50 has a frequency corresponding to the frequency after the signal correction before the phase compensation in the VCM driving device 1, and the frequency is slowly from about 200 [Hz]. It has a gain characteristic (solid line in the figure) in which the slope becomes large, and a phase characteristic (dotted line in the figure) in which the phase slowly advances from about 200 [Hz] with respect to the frequency.

  FIG. 11 shows gain characteristics with respect to frequency in the VCM 10, the VCM driving apparatus 1 before phase compensation and signal correction, and the VCM driving apparatus 1 after signal correction before phase compensation. FIG. 12 shows the phase characteristics with respect to frequency in the VCM 10, the VCM driving apparatus 1 before phase compensation and signal correction, and the VCM driving apparatus 1 after signal correction before phase compensation. That is, FIG. 11 shows a gain characteristic obtained by summarizing the gain characteristics shown in FIGS. FIG. 12 shows phase characteristics obtained by summarizing the phase characteristics shown in FIGS.

  As shown in FIGS. 11 and 12, the gain characteristics (solid line in FIG. 11) and the phase characteristics (solid line in FIG. 12) of the VCM driving apparatus 1 before phase compensation and before signal correction are the same as those of the position signal correction circuit 40. By the correction, the gain characteristic (the dotted line on FIG. 11) in which the slope slowly increases from about 200 [Hz] and the phase characteristic (the dotted line on FIG. 12) in which the phase slowly proceeds from about 200 [Hz]. It is corrected to. That is, even in a high frequency region of about 200 [Hz] or higher, the phase does not rise and the gain continues to decrease to 1 [1 kHz] or higher. Therefore, the phase compensation of the phase compensation circuit 50 can control the VCM driving device 1 without oscillating.

  FIG. 13 shows gain and phase characteristics with respect to frequency in the VCM driving apparatus 1 excluding the position signal correction circuit 40. FIG. 14 shows gain and phase characteristics with respect to frequency in the VCM driving apparatus 1. As shown in FIG. 13, the VCM driving apparatus 1 excluding the position signal correction circuit 40 has a frequency from about 200 [Hz] with respect to the frequency as a characteristic corresponding to after the phase compensation in the VCM driving apparatus 1 and before the signal correction. It has a gain characteristic (solid line in the figure) that suddenly rises without a gain drop, and a phase characteristic (dotted line in the figure) in which the phase suddenly advances at a frequency of about 200 [Hz] with respect to the frequency.

  As shown in FIG. 14, the VCM driving device 1 has a gain characteristic (as a characteristic corresponding to after the phase compensation and signal correction in the VCM driving device 1) that gradually increases in inclination from about 200 [Hz] with respect to the frequency. A solid line on the diagram) and a phase characteristic (dotted line on the diagram) having a gain margin with respect to the frequency and having a phase of −180 °. For this reason, the VCM driving apparatus 1 can be controlled without oscillation. Further, since the VCM driving device 1 does not add a low-pass filter other than the phase compensation circuit 50, the gain can be increased and the gain intersection can also be increased.

  As described above, according to the present embodiment, the VCM driving apparatus 1 includes the position signal from the position signal generation circuit 30 in addition to the VCM 10, the position detection sensor 20, the position signal generation circuit 30, the phase compensation circuit 50, and the VCM drive circuit 60. In addition, a position signal correction circuit 40 that feeds back and adds a part of the reverse phase of the control signal and outputs the result to the phase compensation circuit 50 as a control signal is provided. For this reason, the VCM driving device 1 can control without oscillation, and can increase the gain intersection without adding a low-pass filter other than the phase compensation circuit 50, so that the driving accuracy of the VCM 10 is improved. Can do.

  Further, the imaging apparatus includes the VCM driving device 1 for camera shake correction, the VCM 10 moves the imaging element in accordance with the driving signal, the position detection sensor 20 moves together with the imaging element, and the imaging apparatus (magnet 12) is operated. The position of the position detection sensor 20 is detected and a sensor signal is output, and the position signal generation circuit 30 changes the position of the position detection sensor 20 to the position of the imaging device (magnet 12) that has changed due to camera shake according to the sensor signal. A position signal of the position detection sensor 20 for following is generated and output. For this reason, since the drive accuracy of the VCM 10 can be increased, the correction accuracy of camera shake correction can be increased.

  The description in the above embodiment is an example of a suitable position signal correction circuit and VCM driving device according to the present invention, and the present invention is not limited to this.

  For example, in the above-described embodiment, the configuration using the Hall element as the position detection sensor has been described. However, the present invention is not limited to this. For example, an MI (Magneto Impedance) sensor (magnetic impedance element), a magnetic resonance magnetic field detection element, an MR (Magneto Resistance) element (magnetoresistance effect element), or the like may be used as the position detection sensor.

  Further, the detailed configuration and detailed operation of each part constituting the VCM driving device 1 in the above embodiment can be changed as appropriate without departing from the spirit of the present invention.

It is a block diagram which shows the structure of the VCM drive device of embodiment which concerns on this invention. It is a figure which shows the positional relationship of a position detection sensor and the coil of VCM. It is a figure which shows the cross-sectional structure of VCM. It is a figure which shows the magnetic force line output from a coil. It is a figure which shows the internal structure of a position signal correction circuit. It is a figure which shows the structure of a signal correction compensation circuit. (A) is a figure which shows an example of the characteristic of the gain with respect to the frequency of a phase compensation circuit. (B) is a figure which shows an example of the characteristic of the phase with respect to the frequency of a phase compensation circuit. It is a figure which shows the characteristic of the gain and phase with respect to the frequency in VCM. It is a figure which shows the characteristic of the gain and phase with respect to the frequency in the VCM drive device except a position signal correction circuit and a phase compensation circuit. It is a figure which shows the characteristic of the gain and phase with respect to the frequency in the VCM drive device except a phase compensation circuit. It is a figure which shows the characteristic of the gain with respect to the frequency in VCM, the VCM drive device before phase compensation and signal correction, and the VCM drive device after signal correction before phase compensation. It is a figure which shows the characteristic of the phase with respect to the frequency in VCM, the VCM drive device before phase compensation and signal correction, and the VCM drive device after signal correction before phase compensation. It is a figure which shows the characteristic of the gain and phase with respect to the frequency in the VCM drive device except a position signal correction circuit. It is a figure which shows the characteristic of the gain and phase with respect to the frequency in a VCM drive device.

Explanation of symbols

1 VCM drive 10 VCM
DESCRIPTION OF SYMBOLS 11 Coil 12 Magnet 13 Yoke 20 Position detection sensor 30 Position signal generation circuit 31,32,33 Resistance 40 Position signal correction circuit 41 Adder 42 Signal attenuation part 40A Signal correction compensation circuit 43, 45, 46, 48 Resistance 44, 47 Operational amplifier 50 Phase compensation circuit 51, 53, 55 Resistor 54 Operational amplifier 56 Capacitor

Claims (3)

Control for driving control of the voice coil motor by inputting a position signal indicating the position of the position detection sensor in accordance with a sensor signal output from a position detection sensor provided at or near the center of the coil of the voice coil motor. An adder for outputting a signal;
A signal attenuating unit for attenuating the control signal output from the adding unit,
The position signal correction circuit that adds the position signal and an inverted phase of the attenuated control signal input from the signal attenuation unit, and outputs the added position signal as the control signal. A position signal correction circuit according to claim 1;
The voice coil motor;
The position detection sensor;
A position signal generation circuit that generates a position signal indicating the position of the position detection sensor in response to a sensor signal output from the position detection sensor;
A phase compensation circuit for phase compensating the control signal output from the signal correction circuit or the position signal output from the position signal generation circuit;
A voice coil motor drive circuit that amplifies the control signal phase-compensated by the phase compensation circuit and outputs it to the voice coil motor as a drive signal;
The position signal correction circuit corrects the position signal output from the position signal generation circuit or the phase compensation circuit and outputs the position signal as a control signal. The voice coil motor driving device is provided in an imaging device having an imaging element,
The voice coil motor moves the image sensor according to the drive signal,
The position detection sensor is movable together with the image sensor, detects a position of the position detection sensor with respect to the imaging device, and outputs a sensor signal;
The position signal generation circuit generates a position signal of the position detection sensor for causing the position of the position detection sensor to follow the position of the imaging device that has been changed due to camera shake according to the sensor signal. The voice coil motor drive device described.

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