WO2009116453A1 - Système de caméra, dispositif pour entraîner un moteur de bobine acoustique et procédé pour entraîner un moteur de bobine acoustique - Google Patents

Système de caméra, dispositif pour entraîner un moteur de bobine acoustique et procédé pour entraîner un moteur de bobine acoustique Download PDF

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Publication number
WO2009116453A1
WO2009116453A1 PCT/JP2009/054816 JP2009054816W WO2009116453A1 WO 2009116453 A1 WO2009116453 A1 WO 2009116453A1 JP 2009054816 W JP2009054816 W JP 2009054816W WO 2009116453 A1 WO2009116453 A1 WO 2009116453A1
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Prior art keywords
signal
waveform
lens
target position
camera system
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PCT/JP2009/054816
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English (en)
Japanese (ja)
Inventor
純一 秦
敏匡 口井
安樹 川阪
琢己 橋本
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シャープ株式会社
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Publication of WO2009116453A1 publication Critical patent/WO2009116453A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/032—Reciprocating, oscillating or vibrating motors
    • H02P25/034—Voice coil motors

Definitions

  • the present invention relates to a camera system, a voice coil motor drive device, and a voice coil motor drive method, and more particularly to a camera system having an autofocus device, a voice coil motor drive device used in an autofocus device, and the like. Regarding the method.
  • Recent camera systems are equipped with an autofocus (hereinafter referred to as AF) function for focusing on a subject by automatic control.
  • the AF function is a function for adjusting the focal length by moving the focus lens in the optical axis direction to adjust the focus.
  • a stepping motor, a voice coil motor (VCM), or the like is used as an actuator for moving a focus lens of a camera system in the optical axis direction.
  • the stepping motor rotates by a certain angle each time pulse power is applied, and can accurately control the rotation angle of the rotor (see, for example, Patent Document 1).
  • the VCM is composed of a voice coil (movable winding) and a permanent magnet. When a current is passed through the voice coil, the voice coil moves linearly in the magnetic field of the permanent magnet, and the motor load is positioned with high accuracy.
  • a stepping motor when used as an actuator, if the pulse frequency is too high, control may be disturbed due to loss of synchronization, so that the drive time becomes longer and the speed cannot be increased as the amount of change increases.
  • the stepping motor is problematic in that it is large in size and noise is large.
  • the control signal used for the control of the VCM is processed by a notch filter having the same center frequency as the resonance frequency, and the gain of the resonance frequency included in the control signal is reduced.
  • the control is stabilized (for example, Patent Document 2).
  • one notch filter corresponds to one center frequency
  • a plurality of notch filters having each resonance frequency as the center frequency are connected in series, and sequentially with respect to the control signal. Notch filter processing will be applied. Therefore, processing time is proportional to the number of resonance frequencies.
  • the present invention has been made to solve the above-described problems, and the resonance vibration of an actuator such as a voice coil motor can be reduced in a short time with a simple configuration. It is an object of the present invention to provide a camera system, a voice coil motor driving device, and a driving method thereof that can realize a high speed AF control using an actuator and a miniaturization of the configuration.
  • a camera system is a camera system that includes an imaging device that outputs an image signal by imaging a subject, a lens that collects incident light on the imaging device, and a lens driving unit that drives the lens.
  • a lens position calculation unit that calculates a target position signal indicating the target position of the lens based on the image signal, and a filter circuit that performs a filtering process on the target position signal so that the change is mitigated.
  • the lens driving unit drives the lens based on the filter output from the filter circuit so that the lens moves from the starting position to the target position, and the filter circuit is obtained from the target position signal.
  • a waveform generator that generates a signal waveform that monotonously increases and then monotonously decreases in accordance with the amount of lens movement from the starting position of the lens to its target position on a clock basis
  • An integration processing unit that integrates the signal waveform generated by the waveform generation unit so that the amplitude level is added to the starting position on a clock basis, and the output signal of the integration processing unit is used as the filter output
  • the waveform generation unit generates a triangular wave as the signal waveform.
  • a convergence time required for the lens to move from its starting position to its target position is set according to the inclination of the inclined side of the triangular wave.
  • the waveform generation unit corrects the amplitude level of the triangular wave at an intermediate position of the triangular wave when the triangular wave is integrated by the integration processing unit.
  • the waveform generation unit corrects the amplitude level of the triangular wave at a position other than an intermediate position of the triangular wave when the integration processing unit integrates the triangular wave.
  • the waveform generation unit generates a signal waveform other than a triangular wave as the signal waveform.
  • the waveform generation unit generates a signal waveform having a shape of a circle or an ellipse at the upper half of the periphery as the signal waveform.
  • the waveform generation unit is a signal in which, as the signal waveform, the rate of increase gradually increases in the monotonically increasing portion and the rate of decrease gradually decreases in the monotonically decreasing portion. It is preferable to generate a waveform.
  • the waveform generation unit generates a signal waveform whose amplitude level changes at a reference clock timing in units of a fixed step as the signal waveform.
  • a peak position of the amplitude level of the signal waveform is located at an intermediate position of the signal waveform.
  • the signal waveform has a peak position of an amplitude level at a position other than an intermediate position of the signal waveform.
  • the waveform generation unit corrects the amplitude level at the peak position of the signal waveform based on the lens movement amount.
  • the waveform generation unit corrects an amplitude level other than a peak position of the signal waveform based on the lens movement amount.
  • the filter circuit includes an update time setting unit that sets an update time for updating the output of the integration processing unit, which is the filter output, in units of the period of the basic clock. Is preferred.
  • the waveform generation unit may include the signal waveform based on an update time set by the update time setting unit so that the filter output is updated in units of one cycle of the basic clock. Is preferably generated.
  • the waveform generation unit may perform the filter output based on the update time set by the update time setting unit so that the filter output is updated in units of two or more periods of the basic clock. It is preferable to generate a signal waveform.
  • the lens driving unit preferably includes a voice coil motor that moves the lens, and a motor driving unit that drives the voice coil motor based on an output of the filter circuit.
  • a voice coil motor driving apparatus is a driving apparatus for driving a voice coil motor that linearly moves a load, and calculates a target position signal indicating a target position of the load based on a driving state of the load.
  • a target position calculation unit a filter circuit that performs a filtering process so that the change is mitigated with respect to the target position signal, and the load from the starting position to the target position based on the filter output from the filter circuit
  • a motor drive unit that drives the voice coil motor to move to the target position, and the filter circuit monotonously according to a load movement amount obtained from the start position of the load to the target position obtained from the target position signal.
  • a waveform generation unit that generates a signal waveform that monotonously decreases after increasing on a clock basis, and the amplitude level of the signal waveform generated by the waveform generation unit is the starting level
  • a integration processing unit for integrating to be added in the clock-based location, the output signal of the integrating processing unit to output the result as the filter output, the objects can be achieved.
  • a voice coil motor driving method is a driving method for driving a voice coil motor that linearly moves a load, and calculates a target position signal indicating a target position of the load based on a driving state of the load.
  • a camera system including an image sensor that outputs an image signal by imaging a subject, a lens that collects incident light on the image sensor, and a lens driving unit that drives the lens, A lens position calculating unit that calculates a target position of the lens, and a filter circuit that performs a filter process on the signal indicating the lens target position so that the change is mitigated, and the lens driving unit is based on the filter output
  • the filter circuit generates a signal waveform that monotonously increases and then monotonously decreases in accordance with the amount of lens movement obtained from the target position signal, and a waveform generation unit that is generated by the waveform generator.
  • An integration processing unit that integrates the signal waveform so that the amplitude level is added to the starting position on a clock basis, and outputs an output signal of the integration processing unit. Because it outputs as a filter output, it generates a waveform that starts and stops gently, and controls actuators such as voice coil motors according to the waveform, thereby allowing the resonance vibration of the actuator to be easily configured. It can be reduced in a short time.
  • the waveform generation unit corrects the amplitude level of the signal waveform when the signal waveform is integrated by the integration processing unit, it is possible to perform filter processing according to the amount of movement of the lens.
  • the filter circuit has an update time setting unit that sets an update time for updating the output of the integration processing unit, which is the filter output, in units of the period of the basic clock. It can be realized from things to slow ones.
  • a camera including an imaging device that outputs an image signal by imaging a subject, a lens that collects incident light on the imaging device, and a lens driving unit that drives the lens.
  • a lens position calculation unit that calculates a target position signal indicating a target position of the lens based on the image signal, and a filter circuit that performs a filtering process so that the change of the target position signal is reduced.
  • the lens driving unit drives the lens so that the lens moves from the starting position to the target position based on the filter output from the filter circuit, and the filter circuit obtains from the target position signal.
  • a waveform generating unit that generates a signal waveform that monotonously increases and then monotonously decreases in accordance with a lens movement amount from the starting position of the lens to the target position.
  • An integration processing unit that integrates the signal waveform generated by the waveform generation unit so that the amplitude level is added to the starting position on a clock basis, and the output signal of the integration processing unit is used as the filter output Therefore, the resonance vibration of an actuator such as a voice coil motor can be reduced in a short time with a simple configuration, thereby speeding up AF control using such an actuator and reducing the size of the configuration. There is an effect that can be realized.
  • a target position calculation unit that calculates a target position signal indicating a target position of the load based on a driving state of the load;
  • a filter circuit that performs a filtering process so as to reduce the change in the target position signal; and the voice coil motor that moves the load from the starting position to the target position based on a filter output from the filter circuit
  • a signal waveform that monotonously increases and then monotonously decreases in accordance with the amount of load movement from the starting position of the load to the target position obtained from the target position signal.
  • a waveform generator that generates a clock base, and a signal waveform generated by the waveform generator, the amplitude level of which is added to the starting position on a clock base.
  • An integration processing unit that integrates and outputs the output signal of the integration processing unit as the filter output, so that the resonance vibration of the voice coil motor can be reduced. There is an effect that it is possible to realize speeding up of the used AF control and the like and downsizing of the configuration.
  • a target position calculating step for calculating a target position signal indicating a target position of the load based on a driving state of the load;
  • a filter step for applying a filtering process to the target position signal so that the change is mitigated; and based on the filtered target position signal, the load moves from the starting position to the target position.
  • a driving step for driving a voice coil motor, and the filtering step monotonously increases and then monotonously decreases in accordance with a load movement amount obtained from the target position signal from the starting position of the load to the target position.
  • a waveform generation step for generating a signal waveform on a clock basis, and the amplitude level of the signal waveform generated in the waveform generation step An integration step of integrating so as to be added to the position on a clock basis, and the integrated value of the signal waveform obtained in the integration step is used as the target position signal subjected to the filter processing. Resonance vibration can be reduced, and there is an effect that it is possible to realize high-speed AF control using such a voice coil motor and downsizing of the configuration.
  • FIG. 1A and 1B are diagrams for explaining a camera system according to Embodiment 1 of the present invention.
  • FIG. 1A shows the overall configuration
  • FIG. 1B shows the configuration of a filter circuit that constitutes the camera system.
  • FIG. 2 is a diagram for explaining the function of the filter circuit constituting the camera system of the first embodiment, and shows the input waveform and the output waveform in comparison.
  • FIG. 3 is a diagram for explaining the control operation of the filter circuit constituting the camera system of the first embodiment.
  • the triangular wave (FIG. 3B) to be integrated and the filter output obtained by integrating the triangular wave are shown.
  • a waveform (FIG. 3A) is shown.
  • FIG. 4 is a flowchart illustrating the operation of the camera system according to the first embodiment.
  • FIG. 4 is a flowchart illustrating the operation of the camera system according to the first embodiment.
  • FIG. 5 is a diagram for explaining the delta width correction processing in the filter circuit constituting the camera system of the first embodiment, and is obtained by integration of the triangular wave (FIG. 5A) to be integrated and this triangular wave.
  • the filter output waveform (FIG. 5B) is shown.
  • 6A and 6B are diagrams for explaining an example of the operation of the filter circuit constituting the camera system according to the first embodiment.
  • FIG. 6A shows a process for forming the triangular wave W4, and
  • FIG. 6B shows the operation of the triangular wave W4.
  • the integration process is shown.
  • FIG. 7 is a diagram for explaining an example of the operation of the filter circuit constituting the camera system according to Embodiment 1 of the present invention.
  • FIG. 7A is a process for correcting the triangular wave W4 to form the triangular wave W5.
  • B shows the integration process of the triangular wave W5.
  • FIG. 8 is a diagram for explaining an update interval control method in the filter circuit constituting the camera system of the first embodiment, in which the filter output is updated in units of one cycle of the basic clock (FIG. 8A). The filter output is updated every two cycles of the basic clock (FIG. 8B).
  • FIG. 9 is a diagram for explaining a camera system according to Embodiment 2 of the present invention.
  • the configuration of the filter circuit that filters the control signal of the lens driving unit (FIG. 9A) and the waveform generation unit of the filter circuit
  • FIG. 10 is a diagram for explaining a camera system according to Embodiment 3 of the present invention.
  • the signal waveform (FIG. 10 (b)) to be performed and the other signal waveform (FIG. 10 (c)) generated by the waveform generation unit of the filter circuit are shown.
  • FIG. 11 is a diagram for explaining the natural vibration of the VCM actuator, and shows the lens position variation until the lens moves to the target position when the lens position is controlled by the VCM actuator.
  • FIG. 1A and 1B are diagrams for explaining a camera system according to Embodiment 1 of the present invention.
  • FIG. 1A shows the overall configuration
  • FIG. 1B shows the configuration of a filter circuit that constitutes the camera system. Show.
  • the camera system 100 includes an imaging device 2 that outputs an image signal Id by imaging a subject, a lens 1 that focuses incident light L on the imaging device 2, and a lens driving unit 120 that drives the lens 1. And a signal processing unit 110 that outputs a video signal such as YUV and generates a control signal As for the lens driving unit 120 based on the image signal Id output from the image sensor 2.
  • the image pickup device 2 is a solid-state image pickup device formed of a CCD image sensor or a CMOS image sensor.
  • the signal processing unit 110 performs digital signal processing of the image signal Id from the image pickup device 2 to output a video signal Vs including a luminance signal, and also controls the respective systems, and the video signal Vs. For example, based on a luminance signal, an AF integration unit 5 for integrating data for autofocus control (AF data). Further, the signal processing unit 110 calculates a target position to which the lens 1 should be moved based on the AF data integrated value output Da of the AF integrating unit 5, that is, depending on how much the focus is achieved.
  • AF data autofocus control
  • a lens position calculation unit (lens position calculation unit) 6 that outputs a target position signal Lp indicating the target lens position, and a filter for reducing resonance vibration so that the change is relaxed with respect to the target position signal Lp
  • a filter circuit 7 that performs processing, and a D / A converter 8 that D / A converts the filter output FLp from the filter circuit 7 and outputs it as a control signal As for the lens driving unit 120 are provided.
  • the lens driving unit 120 drives the lens 1 based on the control signal As so that the lens 1 moves from its starting position to its target position.
  • An actuator 10 to be moved and an actuator drive unit 9 for driving the actuator 10 based on the control signal As are provided.
  • a voice coil motor is used for the actuator 10.
  • the filter circuit 7 holds the current stop position determined by the previous driving of the lens as the starting position X1, and the target position signal from the starting position X1 acquired from the latch circuit 75.
  • a movement amount calculation unit 71 that calculates a lens movement amount DX (
  • the latch circuit 75 is configured to latch the output of the integration processing unit 73 when the output of the integration processing unit 73 does not change for a predetermined time.
  • the waveform generation unit 72 is set so as to sequentially output the amplitude level of a triangular wave (delta) in units of one cycle of the reference clock according to an external setting signal.
  • the filter circuit 7 sets how many times the unit of the change in the amplitude level of the signal waveform is set to the reference step width in response to an instruction from the outside of the filter circuit and the clock generation unit 70e that generates the basic clock CL. (DSTEP), a step setting unit 70c that outputs a step width setting signal Sc indicating the set value to the waveform generation unit 72, and a timing at which the waveform generation unit 72 outputs the amplitude level of the signal waveform from the outside of the filter.
  • An update timing setting unit (update time setting unit) 70 f that is set by an instruction and outputs timing information Ut indicating the set timing to the waveform generation unit 72 is provided.
  • the filter circuit 7 designates a position for correcting the amplitude level of the signal waveform generated by the waveform generation unit 72 according to an instruction from the outside of the filter circuit, and a corrected position instruction signal Pd indicating the correction position is specified by the waveform generation unit 72.
  • the correction position designating unit 70a for outputting to.
  • the filter circuit 7 generates the signal waveform Wf generated by the waveform generator 72 on a clock basis, that is, the basic generated by the clock generator 70e so that the amplitude level is added to the starting position X1 of the lens 1.
  • An integration processing unit 73 that integrates according to the clock CL is provided.
  • the waveform generation unit 72 An update interval for updating the amplitude level is defined as one reference clock period.
  • the correction position specifying unit 70a the correction position where the amplitude of the signal waveform is to be corrected is set to the intermediate position of the signal waveform, that is, the intermediate point between the starting position and the target position (in this case, the second clock). Yes.
  • the integration processing unit 73 as shown in FIG. 6B, the first step width is added to the starting position X1 at the first clock, and the second step width is further added at the second clock.
  • one step width is further added, and the signal level (WDOUT) of the target position signal reaches the level corresponding to the target position X2 from the starting position X1 by this addition processing (integration processing of the waveform W4), and the lens is moved.
  • the amount is a distance corresponding to a 4-step width.
  • the waveform generation unit 72 has a substantial triangular wave with an area of 5 as shown in FIG. W5 is formed over 3 clock periods.
  • the integration processing unit 73 as shown in FIG. 7B, the first step width is added to the starting position X1 at the first clock, and the third step width is further added at the second clock.
  • one step width is further added, and the signal level (WDOUT) of the target position signal reaches the level corresponding to the target position X2 from the starting position X1 by this addition processing (integration processing of the waveform W5), and the lens is moved.
  • the amount is a distance corresponding to a 5-step width.
  • the digital signal processing unit 4 performs digital signal processing of the image signal Id from the imaging device 2 to output a video signal Vs including a luminance signal, and controls each system.
  • the AF integration unit 5 integrates data for autofocus control (AF data) based on, for example, a luminance signal included in the video signal Vs.
  • the lens position calculation unit 6 moves the lens 1 based on the AF data integrated value output Da of the AF integrating unit 5, that is, according to how much the focus is achieved.
  • the power target position is calculated, and a target position signal Lp indicating the target lens position is output to the filter circuit 7.
  • the filter circuit 7 performs a filter process for reducing the resonance vibration so that the change is relaxed with respect to the target position signal Lp.
  • the target position signal Lp input to the filter circuit 7 becomes a signal (output) FLp that changes gradually by the filter processing in the filter circuit, as shown in FIG.
  • the D / A converter 8 D / A converts the filter output FLp to the lens driving unit 120 as its control signal As. Output.
  • the lens driving unit 120 drives the lens 1 so that the lens 1 moves from its starting position X1 to its target position X2. That is, in the lens driving unit 120, the actuator driving unit 9 drives the actuator 10, whereby the voice coil motor that is the actuator 10 moves the lens 1.
  • the latch circuit 75 holds the current stop position determined by the previous driving of the lens as the starting position X1.
  • the movement amount calculation unit 71 calculates the lens movement amount DX (
  • the waveform (WDOUT) is generated by performing an integration process on the generated delta waveform (FIG. 3A).
  • the actuator driving unit 9 controls the VCM (actuator) 10 using the generated WDOUT waveform, thereby reducing the resonance vibration and increasing the speed of the AF control.
  • delta and WDOUT are obtained by the following Expression 1, Expression 2a, and Expression 2b.
  • the step width (DSTEP) that is, the width for changing the signal waveform can be arbitrarily controlled from the outside by the step setting unit 70c.
  • Tw is the current integration position
  • WC is the filter output value at the integration position Tw
  • Tc is an intermediate position of the triangular wave (deltaC)
  • Wth is a filter output value at the intermediate position Tc.
  • the filter output (WDOUT) is generated according to the flow shown in FIG.
  • step S1 when the movement amount (
  • step S4 it is determined whether or not the filter output exceeds the intermediate value when the amplitude level (delta) of the triangular wave is increased by one step width (step S4).
  • step S4 If it is determined in step S4 that the filter output does not exceed the intermediate value, the processes in steps S2 to S4 are repeated until it is determined that the filter output exceeds the intermediate value. During this time, as shown in FIG. 5A, the amplitude level (delta) of the triangular wave increases by one step width, and the filter output (WDOUT) gradually increases at an increasing rate.
  • step S4 If it is determined in step S4 that the filter output exceeds the intermediate value, it is further determined whether or not correction of the amplitude level of the triangular wave is necessary (step S5). If correction is not necessary, the process of step S7 is performed. If correction is required, a correction value is calculated according to equation 3b (step S6).
  • delta_sp
  • the current value is the current value of the filter output.
  • the area of the triangular wave (delta C) and the movement distance can be matched.
  • FIG. 7 shows an example of the correction as described above.
  • step S7 the amplitude level of the triangular wave is decreased by one step width every clock according to the equation 2b.
  • the amplitude of the triangular wave is added to the filter output one clock before according to Equation 1 (step S8).
  • delta delta-step width (DSTEP) (WDOUT from intermediate value Wth to target value) Equation 2b
  • DSTEP delta-step width
  • the lens position calculation unit 6 that calculates the target position of the lens from the image signal and the filter process are performed so that the change is reduced with respect to the signal Lp indicating the lens target position.
  • the filter circuit 7 includes a lens driving unit 120 that drives the lens 1 based on the filter output As. The filter circuit 7 monotonously increases and then monotonously decreases in accordance with the lens movement amount obtained from the target position signal Lp.
  • a waveform generation unit 72 that generates a signal waveform to be generated on a clock basis
  • an integration processing unit 73 that integrates the signal waveform generated by the waveform generation unit 72 so that the amplitude level is added to the starting position on a clock basis
  • the output signal WDOUT of the integration processing unit 73 is output as the filter output
  • an actuator such as a voice coil motor
  • a camera capable of reducing the resonance vibration of a motor with a simple configuration and shortening the filter processing time to increase the speed of AF control using such an actuator and to reduce the size of the configuration. Get the system.
  • the waveform generation unit 72 corrects the amplitude level of the triangular wave at an intermediate position of the triangular wave, so that the filter processing according to the movement amount of the lens is performed. Can do.
  • the signal waveform (triangular wave waveform) used for the integration process can be changed by changing the step width (DSTEP), which is a unit for changing the amplitude level of the triangular wave, by the step setting unit 70c.
  • DSTEP step width
  • lens drive control according to the characteristics of the lens drive system is possible.
  • the filter circuit 7 includes an update timing setting unit 70f that sets an update time (hereinafter also referred to as an update period) for updating the amplitude level of the signal waveform by the waveform generation unit 72 in units of the basic clock cycle.
  • Lens drive control can be realized from a fast response to a slow response.
  • This update period can be designated from the outside.
  • the waveform of the triangular wave which is the signal waveform, can be made more gradual, whereby the change in the filter output can be made more gradual.
  • the same thing can be performed by changing the step width (DSTEP) in the step setting unit 70c.
  • FIG. 9 is a diagram for explaining a camera system according to Embodiment 2 of the present invention.
  • FIG. 9A shows the configuration of a filter circuit that filters the control signal of the lens driving unit.
  • the waveform generation unit of the filter circuit is shown in FIG.
  • the signal waveform (FIG. 9B), the corrected signal waveform (FIG. 9C), and the filter output (FIG. 9D) are shown.
  • the position for correcting the amplitude level of the signal waveform can be arbitrarily set by designation from the correction position designation unit 70a instead of the waveform generation unit 72 of the filter circuit in the camera system of the first embodiment.
  • a simple waveform generator 72a is provided.
  • the configuration of the filter 7a of the second embodiment is the same as that of the filter 7 of the first embodiment except for the waveform generation unit 72a, and the waveform generation unit 72a includes the lens movement amount DX from the movement amount calculation unit 71, A calculation unit 721 that calculates a correction position and a correction period for the signal waveform based on the correction position instruction signal Pd from the correction position specifying unit 70a and the step width setting signal Sc from the step setting unit 70c, and the calculation unit 721 And an output unit 722 that outputs the amplitude level of the corrected signal waveform on a clock basis based on the correction position and the correction period calculated in (1).
  • the lens movement amount DX from the movement amount calculation unit 71, the correction position instruction signal Pd from the correction position designation unit 70a, and the step setting unit 70c Since the correction position and the correction period for the signal waveform are calculated based on the step width setting signal Sc from, the correction position designation unit 70a designates that the correction is performed with the starting position and the target position of the lens.
  • the calculation unit 721 generates a signal waveform (triangular wave) such that the integrated value obtained by integrating the amplitude level on a clock basis does not exceed the lens movement amount DX based on the step width specified by the step setting unit 70c.
  • the step width specified by the step setting unit 70c is set. Based on this, the signal waveform (triangular wave) W9 is calculated in advance so that the integrated value obtained by integrating the amplitude level on a clock basis does not exceed the lens movement amount DX, and the area (amplitude) of the signal waveform obtained by this calculation is calculated.
  • a triangular waveform W11 (FIG. 9C) is output from the waveform generator 72a on a clock basis.
  • the waveform generation unit 72a generates a substantial triangular wave W11 having an area of 11 as shown in FIG. Formed over a clock period.
  • This triangular wave W11 is obtained by adding one clock period at each end position of the preset triangular wave W9 and correcting the amplitude value of the triangular waveform W11 to be one step width at this additional portion. is there.
  • the integration processing unit 73 adds one step width to the starting position X1 at the first clock, and further adds one step width at the second clock.
  • the 2 step width is further added, at the 4th clock, the 3 step width is further added, at the 5th clock, the 2 step width is further added, at the 6th clock, the 1 step width is further added, At the seventh clock, one step width is further added.
  • the signal level (WDOUT) of the target position signal reaches the target position X2 from the starting position X1, and the moving amount of the lens becomes a distance corresponding to 11 step widths.
  • the waveform generation unit 72a sets the lens movement amount DX from the movement amount calculation unit 71, the correction position instruction signal Pd from the correction position designation unit 70a, and the step width setting from the step setting unit 70c. Based on the signal Sc, a calculation unit 721 for calculating a correction position and a correction period for the signal waveform, and based on the correction position and the correction period calculated by the calculation unit 721, the amplitude level of the corrected signal waveform is clocked.
  • the position for correcting the amplitude level of the signal waveform is set to an arbitrary position by designation from the correction position designation section. There is an effect that it can also be set at the front end of the signal waveform on the time axis.
  • the waveform generation unit generates a triangular wave.
  • the waveform generated by the waveform generation unit is not limited to a triangular wave, and the filter uses a waveform other than the triangular wave. It is also possible to perform filter processing.
  • FIG. 10 is a diagram for explaining a camera system according to Embodiment 3 of the present invention. The configuration of the filter circuit that filters the control signal of the lens driving unit (FIG. 10A), generated by the waveform generation unit of the filter circuit The signal waveform (FIG. 10B) to be performed and the other signal waveform (FIG. 10C) generated by the waveform generation unit of the filter circuit are shown.
  • the camera system according to the third embodiment includes a filter circuit 7b having a configuration in which the shape of a signal waveform used for filter processing can be designated from the outside, instead of the filter circuit 7 in the camera system according to the first embodiment.
  • the filter 7b of the third embodiment defines a signal waveform generated by the waveform generation unit 72 according to an instruction from the outside of the filter, and shows the defined signal waveform.
  • a waveform designating unit 70b for outputting the waveform designating signal Wc is provided, and the step setting unit 70c is configured so that the signal waveform generated by the waveform generating unit 72 based on the waveform designating signal Wc becomes the waveform indicated by the designating signal Wc.
  • the step width is changed in accordance with the timing from the update timing setting unit 70f.
  • the other configurations of the third embodiment are the same as those of the first embodiment.
  • the waveform designating unit 70b designates a convex semicircular waveform as shown in FIG. 10B or a convex skirt-like waveform as shown in FIG. 10C.
  • the step setting unit 70c updates the step width so that the signal waveform generated by the waveform generation unit 72 becomes the waveform indicated by the designation signal Wc based on the waveform instruction signal Wc from the waveform designation unit 70b. It is changed according to the timing from the timing setting unit 70f.
  • a signal waveform generated by the waveform generation unit 72 is defined by an instruction from the outside of the filter, and a waveform instruction signal Wc indicating the defined signal waveform is output.
  • a step setting unit 70c that updates the step width based on the waveform instruction signal Wc so that the signal waveform generated by the waveform generation unit 72 is the waveform indicated by the designation signal Wc. Since it is configured to change according to the timing from the setting unit 70f, in addition to the effect of the first embodiment, as shown in FIG. 10A, the signal waveform used for the filter processing of the signal indicating the lens position is convex.
  • a semicircular waveform (FIG. 10B) or a convex-shaped waveform (FIG. 10C) can be used.
  • the signal waveform defined by an instruction from the outside of the filter circuit in the waveform specifying unit 70b is the above-described triangular waveform, the signal waveform having the shape of the upper half of the circle as shown in FIG. 10B, or FIG.
  • the amplitude level is not limited to a signal waveform in which the increase rate is gradually increased in the monotonically increasing portion and the decrease rate is gradually decreased in the monotonically decreasing portion.
  • the signal waveform defined by an instruction from the outside of the filter circuit in the waveform designating unit 70b is a waveform having a shape of the upper half periphery of the ellipse instead of the shape of the upper half periphery of the circle shown in FIG. There may be.
  • the peak position of the amplitude level is not limited to the one positioned at the intermediate position of the signal waveform, and the signal waveform has the peak position of the amplitude level at the intermediate position of the signal waveform. You may be located in positions other than a position.
  • the waveform generator corrects the amplitude level at the peak position of the signal waveform based on the lens movement amount
  • FIG. 9 Embodiment 2.
  • the signal waveform is not limited to the amplitude level correction at the start and end positions on the time axis, and the amplitude levels other than these positions of the signal waveform are based on the lens movement amount. You may correct
  • the present invention creates a signal waveform such as a triangular wave with respect to a lens movement amount, and the amplitude level of the signal waveform is a lens.
  • the waveform of the signal indicating the target position of the lens is a waveform that the lens starts slowly and converges gently, and the VCM (voice coil motor) is controlled according to the waveform.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Lens Barrels (AREA)
  • Studio Devices (AREA)
  • Control Of Linear Motors (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

L'invention porte sur un système de caméra capable de réduire l'oscillation de résonance d'un actionneur tel qu'un moteur de bobine acoustique par une configuration simple et dans un court laps de temps pour ainsi accélérer une commande AF à l'aide de l'actionneur et réduire la dimension de la configuration. Le système de caméra est pourvu d'une unité de calcul de position d'objectif (6) pour calculer la position cible d'un objectif à partir d'un signal d'image, d'un circuit de filtrage (7) pour effectuer un traitement de filtrage sur un signal indiquant la position cible d'objectif, de telle sorte que le changement de celui-ci est facilité, et d'une unité d'entraînement d'objectif (120) pour entraîner un objectif (1) sur la base d'une sortie de filtre (As). Le circuit de filtrage (7) est équipé d'une section de génération de formes d'onde (72) pour générer une forme d'onde de signal qui diminue de manière monotone après augmentation de manière monotone sur une base d'horloge, conformément à une quantité de déplacement d'objectif obtenue à partir d'un signal de position cible (Lp), et une section de traitement d'intégration (73) pour intégrer la forme d'onde de signal générée par la section de génération de forme d'onde (112), de telle sorte que le niveau d'amplitude de celle-ci est ajouté à une position de départ sur une base d'horloge.
PCT/JP2009/054816 2008-03-19 2009-03-12 Système de caméra, dispositif pour entraîner un moteur de bobine acoustique et procédé pour entraîner un moteur de bobine acoustique WO2009116453A1 (fr)

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JP2008072481A JP5330718B2 (ja) 2008-03-19 2008-03-19 カメラシステム、ボイスコイルモータの駆動装置、およびボイスコイルモータの駆動方法
JP2008-072481 2008-03-19

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WO2010090904A3 (fr) * 2009-02-09 2011-09-22 Analog Devices, Inc. Techniques de commande pour des systèmes à moteur
EP2216899A3 (fr) * 2009-02-09 2012-01-11 Analog Devices, Inc. Techniques de contrôle pour systèmes motorisés
WO2010090910A3 (fr) * 2009-02-09 2012-01-19 Analog Devices, Inc. Techniques de commande pour systèmes entraînés par un moteur
US8228017B2 (en) 2009-02-09 2012-07-24 Analog Devices, Inc. Control techniques for motor driven systems
CN102854699A (zh) * 2011-06-29 2013-01-02 马克西姆综合产品公司 用于摄像模块中的自动聚焦致动器的自校准振铃补偿
US8766565B2 (en) 2009-02-09 2014-07-01 Analog Devices, Inc. Control techniques for motor driven systems
CN104254804A (zh) * 2012-04-27 2014-12-31 高通股份有限公司 用以部署用于透镜响铃及振动的主动阻尼的系统及方法

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TW201212525A (en) * 2010-09-15 2012-03-16 Fitipower Integrated Tech Inc Control method for voice coil motor control method and lens focusing system
CN102468803A (zh) * 2010-11-05 2012-05-23 天钰科技股份有限公司 音圈电机的控制方法及镜头对焦系统
US8896245B2 (en) 2012-03-26 2014-11-25 Gm Global Technology Operations Llc. Methods, systems and apparatus for generating voltage command signals for controlling operation of an electric machine
JP6113579B2 (ja) * 2013-05-31 2017-04-12 ローム株式会社 ボイスコイルモータの駆動回路および駆動方法ならびにそれらを用いたレンズモジュールおよび電子機器
JP6285689B2 (ja) * 2013-10-31 2018-02-28 ローム株式会社 アクチュエータの駆動回路装置及び駆動方法並びにそれらを用いたレンズモジュール及び電子機器

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WO2010090904A3 (fr) * 2009-02-09 2011-09-22 Analog Devices, Inc. Techniques de commande pour des systèmes à moteur
EP2216899A3 (fr) * 2009-02-09 2012-01-11 Analog Devices, Inc. Techniques de contrôle pour systèmes motorisés
WO2010090910A3 (fr) * 2009-02-09 2012-01-19 Analog Devices, Inc. Techniques de commande pour systèmes entraînés par un moteur
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US8766565B2 (en) 2009-02-09 2014-07-01 Analog Devices, Inc. Control techniques for motor driven systems
US8884573B2 (en) 2009-02-09 2014-11-11 Analog Devices, Inc. Control techniques for motor driven systems
US10025276B2 (en) 2009-02-09 2018-07-17 Analog Devices, Inc. Control techniques for motor driven systems
CN102854699A (zh) * 2011-06-29 2013-01-02 马克西姆综合产品公司 用于摄像模块中的自动聚焦致动器的自校准振铃补偿
CN104254804A (zh) * 2012-04-27 2014-12-31 高通股份有限公司 用以部署用于透镜响铃及振动的主动阻尼的系统及方法

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