JP2017116818A - Image blurring correction device, method for controlling the same, control program, and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct image blurring precisely without making positional correction control by an image blurring correction lens unstable.SOLUTION: The position of an image blurring correction lens 212 is detected. Further, the detected position is corrected with a predetermined correction value by an image blurring correction control unit 222 so that the correct detected position is obtained, if the detected position is beyond a reference point, set in a control range. Based on the correct detected position, driving of the image blurring correction lens is controlled.SELECTED DRAWING: Figure 5

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image blur correction apparatus, a control method thereof, a control program, and an imaging apparatus, and more particularly to an image blur correction apparatus that corrects an image blur due to a shake such as a camera shake.

  In general, an imaging apparatus such as a digital camera is provided with an optical camera shake correction device (hereinafter also referred to as a camera shake correction unit) for correcting image shake (hereinafter referred to as image shake). In optical camera shake correction, the amount of camera shake applied to the imaging device is detected using an angular velocity sensor or the like, and the image shake correction lens is driven and controlled at a position where the detected camera shake amount is canceled. Thus, the image formation position of the optical image formed on the image sensor (image sensor) is corrected, and image blur due to camera shake is suppressed.

  In general, when image blur is corrected, image blur can be further suppressed when the control range (hereinafter referred to as a movable range) of the camera shake correction lens is large. The movable range is determined according to the mechanical mechanism, the control margin, and electrical restrictions (hereinafter collectively referred to as restrictions). These restrictions include the output of the position detection unit that detects the position of the image blur correction lens.

  For example, it is assumed that a Hall element is used in the position detection unit. A hall element is attached to the base member provided in the camera shake correction unit, and a magnet is bonded to the movable portion to which the image shake correction lens is fixed. The Hall element detects the relative position between the image blur correction lens and the magnet according to the magnetic field generated by the magnet, that is, the magnetic flux density. For this reason, it is desirable that the relationship between the actual position (actual position) of the image blur correction lens and the position detected by the Hall element is a linear relationship.

  However, the actual position of the image stabilization lens and the hole are more separated as the position of the image stabilization lens becomes farther from the control center position due to magnet magnetization, components provided in the image stabilization unit, and variations in its mounting. The difference from the position detected by the element may become large. As a result, the image blur correction unit cannot perform blur correction with high accuracy, and the image stabilization performance deteriorates.

  In order to cope with the above-described problem, for example, there is a method of limiting the movable range of the image blur correction lens to a range in which the relationship between the actual position of the image blur correction lens and the position detected by the Hall element is linear. However, as described above, if the movable range is limited, large image blur cannot be handled.

  In the above description, the example in which the image blur correction lens is driven and controlled to correct the image blur has been described. However, the same problem occurs when the image sensor is shifted to perform the image blur correction.

  For example, the correction coefficient is obtained based on the first deviation that is the difference between the drive target position of the image blur correction lens and the reference position in response to the above-described decrease in the image stabilization performance. Further, a second deviation which is a difference between the detection position which is the output of the position detection unit and the drive target position is obtained, and the PID control gain is adjusted based on the correction coefficient and the second deviation, thereby correcting the image blur. Is controlled (see Patent Document 1). Thus, in Patent Document 1, the control error of the image blur correction lens that occurs when the image blur correction lens moves away from the control center position is canceled.

  Further, the image blur correction lens is driven and controlled in advance, and a correction table is generated for the relationship between the actual position of the image blur correction lens and the position detected by the position detector. At the time of shooting, there is one in which the output of the position detection unit is corrected using the correction table, and the image blur correction lens is driven and controlled based on the corrected output (see Patent Document 2). ).

JP2013-205549A JP 2009-145635 A

  However, in the method described in Patent Document 1, the position correction control may become unstable because the PID control gain is adjusted based on the correction coefficient and the second deviation.

  Further, in the method described in Patent Document 2, it is necessary to generate a correction table in advance for each individual, and it takes time to generate the correction table.

  Accordingly, an object of the present invention is to provide an image blur correction apparatus, a control method thereof, a control program, and an imaging device that can perform image blur correction with high accuracy without causing unstable position correction control of the image blur correction lens. To provide an apparatus.

  In order to achieve the above object, an image blur correction apparatus according to the present invention is an image blur correction apparatus that corrects an image blur of an image obtained by photographing, and is driven and controlled within a preset control range to reduce the image blur. An image blur correcting member to be corrected, a position detecting unit for detecting the position of the image blur correcting member, and a detection position that is an output of the position detecting unit is a position that exceeds a reference point set in the control range. Determining means for determining whether the detection position is in a position exceeding the reference point, and a correction means for correcting the detection position with a predetermined correction value to be a corrected detection position. And control means for driving and controlling the image blur correction member based on the correction detection position.

  An image pickup apparatus according to the present invention includes an image pickup unit that obtains the image in accordance with an optical image formed through an image pickup optical system, and the image blur correction apparatus.

  A control method according to the present invention is a control method for an image blur correction apparatus having an image blur correction member that corrects an image blur of an image obtained by photographing that is driven and controlled within a preset control range. A position detection step for detecting the position of the position, a determination step for determining whether or not the detection position obtained in the position detection step exceeds a reference point set in the control range, and the determination step, When it is determined that the detection position is beyond the reference point, a correction step of correcting the detection position with a predetermined correction value to obtain a correction detection position, and the image blur correction member based on the correction detection position And a control step for controlling the driving of the motor.

  A control program according to the present invention is a control program used in an image blur correction apparatus having an image blur correction member that corrects an image blur of an image obtained by shooting and controlled in a preset control range. The computer provided in the correction apparatus has a position detection step for detecting the position of the image blur correction member, and whether or not the detection position obtained in the position detection step exceeds a reference point set in the control range. A determination step for determining the detection position to be a correction detection position by correcting the detection position with a predetermined correction value when it is determined in the determination step that the detection position is in a position exceeding the reference point; And a control step of driving and controlling the image blur correction member based on the correction detection position.

  According to the present invention, when the detection position of the image blur correction member is in a position exceeding the reference point, the detection position is corrected with the predetermined correction value to obtain the correction detection position. Image blur correction can be performed with high accuracy without the position correction control becoming unstable.

It is a block diagram which shows the structure about an example of an imaging device provided with the image blurring correction apparatus by embodiment of this invention. FIG. 2 is a block diagram illustrating a configuration of an example of an image blur correction control unit illustrated in FIG. 1. It is a figure for demonstrating the pitch direction and yaw direction with respect to the camera shown in FIG. FIG. 3 is a diagram for explaining the relationship between the detection position of the image blur correction lens shown in FIG. 2 and the actual position of the image blur correction lens, (a) is a diagram showing the relationship between the detection position and the actual position; FIG. 4 is a diagram illustrating an example of a correction value for a detection value (detection position) equal to or higher than a reference point shown in FIG. 3 is a flowchart for explaining an example of image blur correction control performed by an image blur correction control unit shown in FIG. 2. It is a flowchart for demonstrating the setting of a reference point in the adjustment process performed with the camera shown in FIG. It is a figure for demonstrating acquisition of the point light source coordinate performed with the camera shown in FIG. It is a figure which shows an example of the function for reference point calculation used with the camera shown in FIG.

  Hereinafter, an example of an image blur correction apparatus according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram illustrating a configuration of an example of an imaging apparatus including an image blur correction apparatus according to an embodiment of the present invention.

  The illustrated imaging apparatus is, for example, a digital camera (hereinafter simply referred to as a camera) and includes an optical block (imaging optical system) 210. The optical block 210 includes a zoom lens 211, an image blur correction lens (image blur correction member) 212, a focus adjustment lens 213, a diaphragm 214, and a shutter 215. The image blur correction lens 212 is driven and controlled in a direction intersecting the optical axis of the optical block 210. The lens driving unit controller 200 includes a zoom control unit 221, an image blur correction control unit 222, a focus control unit 223, an aperture control unit 224, and a shutter control unit 225.

  The zoom control unit 221 drives and controls the zoom lens 211 under the control of the system controller 280. The image blur correction control unit 222 drives and controls the image blur correction lens 212 under the control of the system controller 280. The focus control unit 223 drives and controls the focus adjustment lens (that is, the focus lens) 213 under the control of the system controller 280. The aperture control unit 224 drives and controls the aperture 214 under the control of the system controller 280. The shutter control unit 225 drives and controls the shutter 215 under the control of the system controller 280.

  An optical image (subject image) is formed on the image sensor 231 via the optical block 210. The image sensor 231 outputs an electrical signal (analog signal) corresponding to the optical image. The imaging control unit 232 controls the readout timing of the imaging element 231 under the control of the system controller 280. An analog signal that is an output of the image sensor 231 is converted into a digital signal (image data) by the A / D converter 233. Then, the memory control circuit 241 stores the image data in the internal memory 243 via the image input unit 234 under the control of the system controller 280.

  The image processing unit 251 performs predetermined pixel interpolation processing, color conversion processing, and subject detection on image data input from the A / D converter 233 or image data read from the internal memory 243 by the memory control circuit 241. Processing and image cutout processing are performed.

  The memory control circuit 241 controls the A / D converter 233, the image processing unit 251, the compression / decompression circuit 242, and the built-in memory 243, and performs control for recording image data on the recording medium 244. The image display unit 206 is an image display device such as a TFT or an LCD. The image display control unit 261 displays an image corresponding to the image data written in the internal memory 243 on the image display unit 206.

  As described above, the built-in memory 243 stores image data such as still images or moving images. Further, the built-in memory 243 is used as a work area for the system controller 280. For example, the compression / decompression circuit 242 compresses the image data stored in the internal memory 243 and writes the compressed image data in the internal memory 243 again. The compression / decompression circuit 242 decompresses the compressed image data stored in the built-in memory 243 and writes the decompressed image data in the built-in memory 243.

  The system controller 280 controls the camera 201. The system controller 280 is connected to the power button 202, the release switch 203, the zoom key 204, and the menu operation key 206. The release button 203 is used to operate a shutter when recording a still image, and is used when starting or stopping moving image recording.

  By operating the zoom operation key 204, the system controller 280 controls the zoom lens 210 by the zoom control unit 221. That is, based on the operation direction and operation amount of the zoom operation key 204, the system controller 280 calculates the zoom drive speed and drive direction, and controls the drive of the zoom lens 210 along the optical axis by the zoom control unit 221. The system controller 280 supplies power to the camera 201 from the power supply 172 by controlling the power supply 272 by the power supply control unit 271 according to the operation of the power button 202.

  FIG. 2 is a block diagram showing the configuration of an example of the image blur correction control unit shown in FIG.

  The image blur correction control unit 222 includes a shake detection unit 2221. The shake detection unit 2221 is, for example, an angular velocity sensor. The shake detection unit 2221 detects the shake of the camera 201 and outputs an angular velocity signal as a camera shake signal. In the illustrated example, the shake detection unit 2221 includes a pitch detection unit (PITCH) 2221a that detects shake (vibration) in the pitch direction and a yaw detection unit (YAW) 2221b that detects vibration in the yaw direction. Hereinafter, the output of PICTH 2221a is called a pitch shake signal, and the output of YAW 2221b is called a yaw shake signal.

  FIG. 3 is a diagram for explaining a pitch direction and a yaw direction with respect to the camera shown in FIG.

  As shown in the figure, an axis extending toward the front (optical block 210) side of the camera 201 is defined as a Z axis, and an axis extending toward the upper surface side of the camera 201 is defined as a Y axis. In addition, an axis extending on the side surface side of the camera 201 is defined as an X axis. The pitch axis corresponds to the X axis, and the shake in the pitch direction is a shake around the X axis. The yaw axis corresponds to the Y axis, and the shake in the yaw direction is a shake around the Y axis.

  The pitch shake signal and the yaw shake signal are converted into a digital pitch shake signal and a digital yaw shake signal by A / D converters 2222a and 2222b, respectively. Filters 2223a and 2223b remove low frequency components below a predetermined low frequency cutoff frequency in the digital pitch shake signal and the digital yaw shake signal, respectively. The filters 2223 a and 2223 b integrate the digital pitch shake signal and the digital yaw shake signal, respectively, and send the pitch shake angle and the yaw shake angle to the target position calculation unit 2224. Hereinafter, the pitch shake angle and the yaw shake angle may be simply referred to as a shake angle.

  The target position calculation unit 2224 amplifies the shake angle based on the zoom position, the focus position, the focal length, and the shooting magnification to obtain an angle target value (also referred to as a target position). This process is performed because the blur correction sensitivity on the imaging surface with respect to the image blur correction stroke changes due to optical changes such as the focal length and the imaging magnification. Then, as will be described later, the driving amount of the image blur correction lens 212 is calculated according to the angle target value.

  As shown in the drawing, the target position calculation unit 2224 receives a lens position (detection position) indicating the current position of the image blur correction lens 212 from the position correction unit 2229. The target position calculation unit 2224 obtains the difference between the target position and the lens position, and sends it to the position control unit 2225 as the lens position difference. The target position, the lens position, and the lens position difference include components in the pitch direction and the yaw direction.

  The position control unit 2225 obtains the drive amount of the image blur correction lens 212 according to the lens position difference, and drives and controls the image blur correction lens 212 by the driver 2226 based on the drive amount.

  In the vicinity of the image blur correction lens 212, a position detector (PITCH) 2227a and a position detector (YAW) 2227b are arranged. The position detector (PITCH) 2227a detects the position of the image blur correction lens 212 in the pitch direction, and the position detector (YAW) 2227b detects the position of the image blur correction lens 212 in the yaw direction. Each of the position detector (PITCH) 2227a and the position detector (YAW) 2227b includes, for example, a Hall element.

  As shown, magnets 2230a and 2230b are bonded to a movable member (not shown) to which the image blur correction lens 212 is attached. The position detection unit (PITCH) 2227a and the position detection unit (YAW) 2227b detect the magnetic field of the magnets 2230a and 2230b, and the detection position (pitch detection position and yaw detection position) of the image blur correction lens 212 according to the magnetic flux density. )

  The relationship between the detected value of the magnetic flux density in the Hall element and the actual position of the image blur correction lens 212 is preferably linear. When the relationship between the actual position of the image blur correction lens 212 and the detected value of the magnetic flux density in the Hall element is not linear, the image blur correction lens 212 is detected by the position detection unit (PITCH) 2227a and the position detection unit (YAW) 2227b. The position is different from the actual lens position.

  The pitch detection position and the yaw detection position are respectively supplied to A / D converters 2228a and 2228b, where they are converted into a digital pitch detection position and a digital yaw detection position by A / D conversion. The digital pitch detection position and the digital yaw detection position are sent to the position correction unit 2229. The position correction unit 2229 selectively corrects the digital pitch detection position and the digital yaw detection position as will be described later. In the following description, the digital pitch detection position and the digital yaw detection position may be collectively referred to as a digital detection position.

  FIG. 4 is a diagram for explaining the relationship between the detection position of the image blur correction lens shown in FIG. 2 and the actual position of the image blur correction lens. FIG. 4A is a diagram showing the relationship between the detection position and the actual position, and FIG. 4B is a diagram showing the correction value for the detection value (detection position) above the reference point shown in FIG. It is a figure which shows an example.

  In FIG. 4A, the horizontal axis indicates the actual position of the image blur correction lens 212, and the vertical axis indicates the detection value in the Hall element. The broken line indicates the ideal characteristic, while the solid line indicates the actual characteristic, and it can be seen that the increase in the detection value decreases when the image blur correction lens 212 is away from the control center by a predetermined distance.

  When image blur correction control (feedback control) is performed under the characteristics indicated by the solid line, image blur correction is performed in a region where the increase in detection value is not linear, that is, in a region away from the control center (also referred to as drive center) by a predetermined distance. Even if the lens 212 reaches the target position, it is determined that the lens 212 has not yet reached the target position. As a result, during image blur correction control, a phenomenon occurs in which the image blur correction lens 212 goes too far from the target position. When such a phenomenon occurs, not only the accuracy of the image blur correction control is deteriorated, but also the image blur correction lens 212 hits the end of the mechanical mechanism, sound may be generated and the sound may remain in the moving image. There is a risk of feeling uncomfortable.

  For the reasons described above, conventionally, image blur correction control is performed by limiting the movement of the image blur correction lens 212 only to a linear region. That is, according to the conventional method, the movable range of the image blur correction lens 212 is narrowed, and the effect of image blur correction is reduced.

  Therefore, in the present embodiment, the relationship between the detection values (pitch detection position and yaw detection position) of the position detection unit (PITCH) 2230a and position detection unit (YAW) 2230b and the actual position of the image blur correction lens 212 is not linear. The detection value is corrected for the area. As a result, the controllability is improved and the control range of the image blur correction lens 212 is widened.

  FIG. 5 is a flowchart for explaining an example of image blur correction control performed by the image blur correction control unit shown in FIG.

  When the image blur correction control is started, the position correction unit 2229 acquires the current position of the image blur correction lens 212 as described above (step S101). Here, the position correction unit 2229 acquires the digital pitch detection position and the digital yaw detection position (that is, the detection value). Then, the position correction unit 2229 determines which position in the control range the image blur correction lens 212 is in accordance with the current position of the image blur correction lens 212. Here, the position correction unit 2229 determines whether or not the current position of the image blur correction lens 212 is within a predetermined range defined by the reference points P and Q shown in FIG. 4A (step S102). ). That is, the position correction unit 2229 determines whether or not the current position of the image blur correction lens 212 is closer to the center than the reference point. Note that the range defined by the reference points P and Q is a range in which a linear relationship is maintained.

  If the current position of the image blur correction lens 212 is not closer to the control center than the reference point, that is, out of the predetermined range (NO in step S102), the position correction unit 2229 uses a predetermined correction value as the detection value. Are added to obtain a corrected detection value (correction detection position) (step S103). Thereafter, the image blur correction control unit 222 detects the shake (that is, the angular velocity) of the camera 201 by the shake detection unit 2221 as described above (step S104).

  With reference to FIG. 4A, the reference point P side is now called the lower end side, and the reference point Q side is called the upper end side. The detection position (detection value) is x, the coordinates of the reference point P are P (A1, P ′), and the coordinates of the reference point Q are Q (A2, Q ′). When the detection position x is closer to the end of the mechanical mechanism than the reference point P or the reference point Q (that is, not to the control center side), a process of adding a correction value to the detection value x is performed. That is, when the detection value x is x <P ′ or Q ′ <x, a process of adding the correction value to the detection value x is performed.

  This correction value is a positive or negative value, and the position correction unit 2229 holds a correction value corresponding to the detection position of the image blur correction lens 212 as a correction table. For example, in FIG. 4A, when the detection value x = s1, the correction value is r2-r1. r2 can be calculated based on the ideal characteristic (broken line), and the difference between the detection value x (here, r1) and r2 becomes the correction value (r2-r1).

  In the illustrated example, a correction table storing correction values corresponding to the detection positions of the image blur correction lens 212 is used. However, a correction function determined according to the detection position of the image blur correction lens 212 is used. You may make it use. Different correction values may be used for the lower end side and the upper end side.

  FIG. 4B shows an example of the position of the correction value with respect to the detection value equal to or higher than the reference point Q in FIG. 4A. Here, as the detection value moves away from the reference point Q, the correction value becomes an exponent. Increases functionally. As described above, when the detected value is not on the control center side with respect to the reference point Q (or P), if the detected value is corrected, the correction value is set as compared with the case where the correction is performed over the entire control range. The capacity of the memory for storing can be reduced.

  Referring again to FIG. 5, if the current position of the image blur correction lens 212 is closer to the control center than the reference point, that is, below the reference point, P ′ ≦ x ≦ Q ′ is satisfied (step S102). In step S104, the image blur correction control unit 222 proceeds to the process of step S104 without correcting the detection value by the position correction unit 2229. In this way, the position correction unit 2229 determines whether or not to correct the detection value according to the relationship between the detection value and the preset reference point.

  Subsequently, the image blur correction control unit 222 uses the target position calculation unit 2224 to calculate the target position of the image blur correction lens 212 based on the angular velocity signal as described above (step S105). Then, the image blur correction control unit 222 obtains a difference between the target position and the detection position (detection value) by the target position calculation unit 2224.

  Next, the image blur correction control unit 222 calculates the drive amount of the image blur correction lens 212 based on the difference by the position control unit 2225 (step S106). In the image blur correction control unit 222, the position control unit 2225 generates a PID output for performing PID control based on the drive amount (step S107). The position controller 2225 provides the PID output to a PWM controller (not shown). The PWM controller performs PWM control of the driver 2226 according to the PID output (step S108). The driver 2226 outputs a driver output corresponding to the PWM control, and the image blur correction lens 212 is driven and controlled by the driver output (step S109). Then, the image blur correction control unit 222 ends the image blur correction control.

  Thus, in the embodiment of the present invention, it is determined whether or not to correct the detection position according to the reference point and the detection position of the image blur correction lens. Thereby, controllability can be improved without narrowing the control range of the image blur correction lens.

  Here, the adjustment process for determining the above-mentioned reference point will be described.

  In the present embodiment, it is possible to set a reference point for each camera. In this case, it is desirable to set the reference point in consideration of variations in parts related to position detection, mechanical mechanisms, sensors, and the like. By adjusting the reference point for each camera, it is possible to further improve the accuracy of position control of the image blur correction lens. However, the following adjustment process needs to be performed after the adjustment related to the position control is completed.

  FIG. 6 is a flowchart for explaining the setting of the reference point in the adjustment process performed by the camera shown in FIG.

  When the reference point adjustment process is started, the image blur correction control unit 222 sets the position correction function to be invalid under the control of the system controller 280 (step S501). Then, the system controller 280 instructs a predetermined target value (target position) to the image blur correction control unit 222 (step S502). The target value is desirably a position away from the control center of the image blur correction lens 212, and it is necessary that the target value be at least on the mechanical end side with respect to the reference point shown in FIG. On the other hand, if the target value is too large, the image blur correction lens 212 may collide with the end of the mechanical mechanism, so that the characteristics of the position detector cannot be measured with high accuracy.

  Subsequently, the system controller 280 acquires the position of the image blur correction lens 212 when the image blur correction control unit 222 drives the image blur correction lens 212 according to the target value. In detecting the position of the image blur correction lens 212, for example, a collimator is used. The system controller 280 acquires point light source coordinates based on an image obtained as a result of imaging the point light source (step S503). Then, the system controller 280 obtains the driving amount of the image blur correction lens 212 according to the point light source coordinates.

  FIG. 7 is a diagram for explaining the acquisition of the point light source coordinates performed by the camera shown in FIG.

  In FIG. 7, the point light source when the target value is commanded is indicated by a black circle. Here, point light source coordinates are acquired at a total of four points on the lower end side and upper end side of the pitch axis and yaw axis.

  Referring to FIG. 6 again, the system controller 280 obtains a reference point based on the position of the image blur correction lens 212, that is, the point light source coordinates (step S504). When obtaining the reference point, the system controller 280 obtains the difference between the actual drive amount and the ideal drive amount. In FIG. 6, if the ideal drive amount is D and the difference between the actual drive amount and the ideal drive amount is L, the difference L is expressed by the following equation (1).

L = √ (Δx ² + Δy ² ) −D (1)
Then, the system controller 280 calculates a reference point based on the difference L. In calculating the reference point, it is necessary to create a dedicated function in advance.

  FIG. 8 is a diagram illustrating an example of a reference point calculation function used in the camera illustrated in FIG.

  In FIG. 8, the illustrated function is a function indicating the relationship between the difference L and the reference point change amount q, and the reference point change amount refers to the change amount from the above-mentioned predetermined reference point. Now, assuming that the predetermined reference point is Qa, the reference point Q to be obtained is expressed by the following equation (2).

Q = Qa + q (2)
The system controller 280 obtains a reference point on the upper end side shown in FIG. 7 based on the equation (2). Similarly, reference points at the other three points are obtained.

  Subsequently, under the control of the system controller 280, the image blur correction control unit 222 sets the position correction function to be valid (step S505). Then, the system controller 280 commands the target value (target position) to the image blur correction control unit 222 (step S506). The target value in step S506 is preferably at least the mechanical end side with respect to the reference point described above and the maximum value in the set control range. That is, here, the target value in step S506 is set to the maximum value in the set control range, taking into account that the drive amount related to the maximum value in the control range varies most. Thus, it is confirmed whether or not the correction amount of the image blur correction lens 212 at the maximum value of the control range is insufficient. Here, four movable ends on the lower end side and the upper end side of the pitch axis and the yaw axis are used as inspection points, but the inspection points may be increased.

  Subsequently, the system controller 280 acquires the position of the image blur correction lens 212 when the image blur correction control unit 222 drives the image blur correction lens 212 according to the target value commanded in step S506. When detecting the position of the image blur correction lens 212, a collimator is used as in the process of step S503. The system controller 280 acquires point light source coordinates based on an image obtained as a result of imaging the point light source (step S507). Then, the system controller 280 obtains the driving amount of the image blur correction lens 212 according to the point light source coordinates.

  Next, the system controller 280 determines whether or not the drive amount (detected value) acquired in step S507 is within a predetermined threshold value (below the threshold value) (step S508). This threshold is set to an ideal drive amount ± adjustment margin. If the drive amount is within the predetermined threshold (YES in step S508), system controller 280 terminates the reference point adjustment process assuming that the reference point obtained in step S504 is appropriate.

  On the other hand, when the drive amount exceeds a predetermined threshold (NO in step S508), system controller 280 determines that the correction amount is insufficient, and operates the reference point to the control center (drive center) side to change the reference point. (Step S509). Then, the system controller 280 returns to the process of step S506.

  That is, in the process of step S509, the system controller 280 performs a process of adjusting the reference point. If the drive amount obtained in the process of step S507 exceeds a predetermined threshold, the system controller 280 determines that the correction amount is insufficient, and sets the reference point P (and Q) obtained in the process of step S504 to the drive center side. Change to Accordingly, the position correction of the image blur correction lens 212 is further started from the drive center side, so that the correction amount can be increased even if the target value is the same as that in step S506. When changing the reference point, the change amount of the reference point may be obtained according to the difference between the drive amount obtained in the process of step S507 and a predetermined threshold value.

  In this way, if the reference point is adjusted, the image blur correction lens can be driven and controlled with high accuracy.

  As described above, in the embodiment of the present invention, the image blur correction can be performed with high accuracy without the position correction control of the image blur correction lens becoming unstable.

  As is apparent from the above description, in the example shown in FIG. 1, the system controller 280 and the image blur correction control unit 222 function as a position detection unit, a determination unit, a correction unit, and a control unit. At least the image blur correction lens 212, the image blur correction control unit 222, and the system controller 280 constitute an image blur correction device.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to these embodiment, Various forms of the range which does not deviate from the summary of this invention are also contained in this invention. .

  For example, the function of the above-described embodiment may be used as a control method, and this control method may be executed by the image blur correction apparatus. Further, a program having the functions of the above-described embodiment may be used as a control program, and the control program may be executed by a computer included in the image blur correction apparatus. The control program is recorded on a computer-readable recording medium, for example.

[Other Embodiments]
The present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

212 Image blur correction lens 222 Image blur correction control unit 2221 Shake detection unit 2224 Target position calculation unit 2225 Position control unit 2226 Driver 2229 Position correction unit 2227a, 2227b Position detection unit

Claims (9)

An image blur correction apparatus that corrects image blur of an image obtained by shooting,
An image blur correcting member that is driven and controlled within a preset control range to correct the image blur;
Position detecting means for detecting the position of the image blur correction member;
A determination unit that determines whether or not a detection position that is an output of the position detection unit is a position that exceeds a reference point set in the control range;
When the determination unit determines that the detection position is in a position exceeding the reference point, a correction unit that corrects the detection position with a predetermined correction value to obtain a correction detection position;
Control means for driving and controlling the image blur correction member based on the correction detection position;
An image blur correction apparatus comprising: When it is determined by the determination means that the detection position is at or below the reference point,
The image blur correction apparatus according to claim 1, wherein the control unit drives and controls the image blur correction member based on the detection position.   The image blur correction apparatus according to claim 1, wherein the correction value increases as the image blur correction member moves away from the reference point in the control range that exceeds the reference point.   The image blur correction apparatus according to claim 1, wherein the correction unit adds the correction value to the detection position to obtain the correction detection position.   2. The position of the image blur correction member at which a difference between a target position when driving and controlling the image blur correction member and the detection position is equal to or less than a preset threshold is set as the reference point. 5. The image blur correction device according to any one of items 1 to 4. Imaging means for obtaining the image according to an optical image formed through an imaging optical system;
An image blur correction device according to any one of claims 1 to 5,
An imaging device comprising:   The imaging apparatus according to claim 6, wherein the image blur correction member is an image blur correction lens that is provided in the imaging optical system and is driven in a direction that intersects an optical axis of the imaging optical system. A control method of an image blur correction apparatus having an image blur correction member that corrects an image blur of an image obtained by photographing under driving control within a preset control range,
A position detecting step for detecting a position of the image blur correcting member;
A determination step of determining whether or not the detection position obtained in the position detection step is at a position exceeding a reference point set in the control range;
When it is determined in the determination step that the detection position is in a position exceeding the reference point, a correction step for correcting the detection position with a predetermined correction value to obtain a correction detection position;
A control step for driving and controlling the image blur correction member based on the correction detection position;
A control method characterized by comprising: A control program used in an image blur correction apparatus having an image blur correction member that corrects an image blur of an image obtained by shooting and controlled in a preset control range,
In the computer provided in the image blur correction device,
A position detecting step for detecting a position of the image blur correcting member;
A determination step of determining whether or not the detection position obtained in the position detection step is at a position exceeding a reference point set in the control range;
When it is determined in the determination step that the detection position is in a position exceeding the reference point, a correction step for correcting the detection position with a predetermined correction value to obtain a correction detection position;
A control step for driving and controlling the image blur correction member based on the correction detection position;
A control program characterized by causing

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