JP2013054264A - Lens barrel and image pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel capable of performing shake correction with higher precision.SOLUTION: The lens barrel comprises: a vibration detection section 220 which detects vibration and outputs a detection signal according to the vibration; a shake correction section including a shake correction optical system 212 movable in a direction crossing an optical axis; a drive section 273 which makes the shake correction section drive so as to correct image blur; a reception section which receives the motion vector quantity of a subject based on an image signal imaged by an image pickup element; an image blur amount calculation section 241 which calculates an amount of image blur on the basis of the detection signal; a bias amount calculation section 261 which calculates, according to a position of the shake correction optical system, a centripetal force for moving the shake correction optical system to the center of a movable range of the shake correction optical system as a bias amount; a bias residual calculation section 281 which calculates a difference between an amount of image blur and an amount of image blur on which the bias amount is superimposed, as bias residual; and control sections 281 and 284 which compare the bias residual and shake residual in the shake correction optical system corresponding to the motion vector quantity, and change the bias amount on the basis of the comparison result.

Description

  The present invention relates to a lens barrel and an imaging apparatus.

  2. Description of the Related Art Conventionally, a technique for detecting camera shake using a sensor such as an angular velocity sensor and performing camera shake correction is known (for example, Patent Document 1).

JP 2009-171341 A

  However, in the prior art, the output of a sensor for detecting camera shake may vary depending on the shooting environment such as the ambient temperature, and camera shake correction may not be performed with high accuracy.

  The problem to be solved by the present invention is to provide a lens barrel capable of performing camera shake correction with higher accuracy.

  The present invention solves the above problems by the following means. In addition, although the code | symbol corresponding to drawing which shows embodiment of this invention is attached | subjected and demonstrated, this code | symbol is only for making an understanding of this invention easy, and is not the meaning which limits this invention.

  [1] A lens barrel according to the present invention includes a vibration detection unit (220) that detects vibration and outputs a detection signal corresponding to the vibration, and a shake correction optical system (movable in a direction crossing the optical axis). 212), a drive unit (273) that drives the shake correction unit to correct image shake, and a motion vector amount of the subject based on the image signal captured by the image sensor (110). In accordance with the position of the receiving unit for receiving, the image shake amount calculating unit (241) for calculating the image shake amount based on the detection signal, and the position of the shake correcting optical system, the shake correcting optical system The difference between the bias amount calculation unit (261) that calculates the centripetal force for moving to the center of the movable range of the optical system as a bias amount, and the image blur amount and the image blur amount on which the bias amount is superimposed is used as a bias residual. Calculate the remaining bias A calculation unit (281), a control unit that compares the bias residual with the shake residual of the shake correction optical system corresponding to the motion vector amount, and changes the bias amount based on the comparison result ( 281 and 284).

  [2] In the invention related to the lens barrel, the control unit (281, 284) may determine that the bias when the difference between the bias residual and the shake residual is larger than a first reference value. The amount can be changed to be small, and when the difference is smaller than the second reference value, the bias amount can be changed to be large.

  [3] In the invention related to the lens barrel, the image shake amount calculation unit (241) changes the image shake amount based on a result of comparison between the bias residual and the shake residual. Can be configured.

  [4] In the invention related to the lens barrel, the control unit (281, 284) can be configured to change the bias amount when the image blur amount shows a maximum value.

  [5] In the invention related to the lens barrel, the receiving unit can receive an exposure start signal for starting exposure of the image sensor, and the control units (281, 284) start the exposure. When the signal is received, the bias amount can be changed.

  [6] The imaging apparatus according to the present invention includes a vibration detection unit (220) that detects vibration and outputs a detection signal corresponding to the vibration, and an image sensor (110) that can move in a direction intersecting the optical axis. A shake correction unit, a drive unit that drives the shake correction unit to correct image shake, and a motion vector amount calculation unit that calculates a motion vector amount of a subject based on an image signal captured by the image sensor. (130), an image shake amount calculation unit for calculating an image shake amount based on the detection signal, and the image pickup device to move to the center of the movable range of the image pickup device according to the position of the image pickup device. A bias amount calculation unit that calculates the centripetal force as a bias amount, a bias residual calculation unit that calculates a difference between the image shake amount and an image shake amount superimposed with the bias amount as a bias residual, and the bias residual And the motion Comparing the deflection residual of the image pickup elements corresponding to the vector quantity, based on the comparison result, characterized in that it comprises a control unit for changing the amount of bias.

  [7] In the invention relating to the imaging apparatus, the control unit may decrease the bias amount when a difference between the bias residual and the shake residual is larger than a first reference value. If the difference is smaller than the second reference value, the bias amount can be changed to be larger.

  [8] In the invention related to the imaging apparatus, the image shake amount calculation unit may be configured to change the image shake amount based on a result of comparison between the bias residual and the shake residual. it can.

  [9] In the invention relating to the imaging apparatus, the control unit may be configured to change the bias amount when the image blur amount exhibits a maximum value.

  [10] In the invention related to the imaging apparatus, the control unit may be configured to change the bias amount immediately before the exposure of the imaging element is started.

  According to the present invention, camera shake correction can be performed with higher accuracy.

FIG. 1 is a block diagram showing a camera 1 according to the present embodiment. FIG. 2 is a graph showing an example of the bias residual. FIG. 3 is a flowchart showing the operation of the camera 1 according to this embodiment. FIG. 4 is a block diagram illustrating a camera according to another embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The single-lens reflex digital camera 1 of the present embodiment (hereinafter simply referred to as the camera 1) includes a camera body 100 and a lens barrel 200, and the camera body 100 and the lens barrel 200 can be attached and detached by a mount unit 300. Is bound to.

  The lens barrel 200 incorporates a photographing optical system including lenses 211 and 212. The correction lens 212 is held by the lens frame 213 and is movable together with the lens frame 213 in a direction intersecting the optical axis L1 of the camera. The range in which the correction lens 212 can move is mechanically limited, and the correction lens 212 can optically correct image blur by moving within the movable range.

  The angular velocity sensor 220 detects the vibration input to the camera 1 and outputs a detection signal corresponding to the vibration. The detection signal output from the angular velocity sensor 220 is amplified to a desired signal level by an amplifier 231 composed of an amplifier circuit and a low-pass filter, and high-frequency noise unnecessary for shake correction is removed. The detection signal output from the amplifier 231 is converted from an analog signal to a digital signal by the A / D converter 232 and then branched into two. One of the signals is sent to the first subtractor 234 via the LPF 233. The other is input to the first subtractor 234 as it is. As a result, a DC component (drift component) at an extremely low frequency is removed from the detection signal, and an angular velocity signal that can be integrated can be obtained.

  The target position calculator 241 integrates the obtained angular velocity signal to calculate the inclination of the optical axis L1 of the photographing optical system, and based on the inclination of the optical axis L1, the focal length of the photographing optical system, and the subject distance. Thus, the target position of the correction lens 212 for correcting the image blur is calculated. The target position of the correction lens 212 calculated by the target position calculation unit 241 is sent to a second subtracter 262 and a fourth subtracter 281 described later.

  On the other hand, the position detection sensor 251 detects the current position of the correction lens 212 and outputs a position signal corresponding to the current position of the correction lens 212. The position signal of the correction lens 212 is converted from an analog signal to a digital signal by the A / D converter 252. Then, the lens position calculation unit 253 calculates the current position of the correction lens 212 based on the converted position signal. The position detection sensor 251 includes the position of the correction lens 212 in the first direction set on a plane perpendicular to the optical axis L1, and the second direction perpendicular to the first direction on the plane perpendicular to the optical axis L1. The position of the correction lens 212 can be detected.

  The current position of the correction lens 212 calculated by the lens position calculation unit 253 is input to the bias amount calculation unit 261. The bias amount calculation unit 261 calculates the centripetal force for moving the correction lens 212 toward the center of the movable range of the correction lens 212 as a bias amount, and inputs the calculated bias amount to the second subtractor 262. To do. In addition, the target position of the correction lens 212 calculated by the target position calculation unit 241 is also input to the second subtractor 262, and the correction lens 212 calculated by the target position calculation unit 241 in the second subtractor 262. The bias amount calculated by the bias amount calculation unit 261 is subtracted from the target position to obtain the control position of the correction lens 212.

  The third subtracter 263 subtracts the current position of the correction lens 212 calculated by the lens position calculation unit 253 from the control position of the correction lens 212 output from the second subtractor 262, and The drive control amount is calculated, and the calculated drive control amount of the correction lens 212 is output to the drive signal calculation unit 271.

  The drive signal calculation unit 271 outputs a drive signal for driving the correction lens 212 based on the drive control amount input from the third subtractor 263, and the output drive signal is input to the motor driver 272. Is done. The motor driver 272 outputs a drive voltage and a drive current for driving the drive unit 273 based on the drive signal output by the drive signal calculation unit 271. As a result, the drive unit 273 outputs a driving force for driving the correction lens mechanism including the correction lens 212.

Further, the target position of the correction lens 212 calculated by the target position calculation unit 241 and the current position of the correction lens 212 calculated by the lens position calculation unit 253 are input to the fourth subtractor 281. Fourth subtractor 281 subtracts the current position of the correction lens 212 from the target position of the correction lens 212, calculates the difference between the target position of the correction lens 212 and the current position of the correcting lens 212 as a bias residual B _r .

Here, FIG. 2 is a graph showing an example of a bias residual B _r. In FIG. 2, the vertical axis represents the position of the correction lens 212, and the horizontal axis represents time. In FIG. 2, the transition of the target position of the correction lens 212 based on the detection signal of the angular velocity sensor 220 is represented by a solid line, and the transition of the current position of the correction lens 212 on which the bias amount is superimposed is represented by a broken line. . Due to the centering bias function of the correction lens mechanism that moves the correction lens 212 toward the center of the movable range, the current position of the correction lens 212 is larger than the target position of the correction lens 212 as shown in FIG. The position is close to the center of the movable range. Then, the current position of the thus corrected lenses bias amount is superimposed, the difference between the target position of the correction lens 212 is calculated as the bias residual B _r. Further, the bias amount increases as the image blur increases and the target position of the correction lens 212 becomes farther from the center of the movable range. Therefore, the bias residual B _r where the current position by subtracting the correction lens 212 from the target position of the correction lens 212 also image blur is increased, the target position of the correction lens 212 increases as becomes farther from the center of the movable range. The correction lens 212 has a position in a first direction set on a plane perpendicular to the optical axis L1 and a position in a second direction perpendicular to the first direction on a plane perpendicular to the optical axis L1. However, in FIG. 2, only the position of the correction lens 212 in the uniaxial direction is shown for convenience of explanation.

Motion vector conversion unit 283, via the contact section 310 provided in the mounting portion 300, the camera body 100 receives the motion vector quantity _{V jk} in the photographing screen to be described later, the motion vector quantity _{V jk} received, This is converted into a shake residual V _r of the correction lens 212. The converted shake residual V _r is output to the fifth subtracter 282.

Fifth subtractor 282, from bias residual B _r sent by the fourth subtracter 281, a run-out residual V _r sent by subtracting the motion vector quantity converter 283, a bias residual B _r The difference U _r from the shake residual V _r is output to the determination unit 284. Unit 284, a difference U _r obtained by subtracting the residual V _r shake from the bias residual B _r, together with determining whether greater or not than a predetermined first reference value thmax, shake from the bias residual B _r difference U _r obtained by subtracting the residual V _r determines whether less than a predetermined second reference value thmin. The determination result by the determination unit 284 is output to the bias amount calculation unit 261.

The bias amount calculation unit 261 changes the calculated bias amount based on the determination result of the determination unit 284. Specifically, as a result of the determination by the determination unit 284, the bias amount calculation unit 261 determines that the difference U _r obtained by subtracting the shake residual V _r from the bias residual B _r is greater than the first reference value thmax. is the case were, by setting so as to increase the gain of the bias amount, as compared with the case where the difference U _r is equal to or less than a first reference value thmax, it calculates a bias amount at a larger value. The bias amount calculation unit 261 determines that the determination result of the determination unit 284 indicates that the difference U _r obtained by subtracting the shake residual V _r from the bias residual B _r is smaller than the second reference value thmin. , by setting so as to decrease the gain of the bias amount, as compared with the case where the difference U _r is the second reference value thmin above, it calculates a bias amount at a smaller value. The gain of the bias amount changed based on the determination result of the determination unit 284 is stored in the nonvolatile memory 264.

  The panning detection unit 290 detects whether panning is performed based on the detection result output from the angular velocity sensor 220. The detection result of the panning detection unit 290 is output to the determination unit 284.

  On the other hand, the camera body 100 includes an image sensor 110, an image processing unit 120, and a motion vector amount calculation unit 130.

  The image sensor 110 is provided on the camera body 100 on the optical axis L1 of the light beam from the subject and at a position that is a planned focal plane of the photographing optical system including the lenses 211 and 212. The image sensor 110 is a two-dimensional array of a plurality of photoelectric conversion elements, and can be constituted by a two-dimensional CCD image sensor, MOS sensor, CID, or the like. The image signal photoelectrically converted by the image sensor 110 is subjected to image processing by the image processing unit 120 and then sent to the motion vector amount calculation unit 130.

  The motion vector amount calculation unit 130 calculates a motion vector amount indicating the motion of the entire screen (motion direction, motion amount). For example, the motion vector amount calculation unit 130 can detect the shake amount and shake direction of the entire screen by comparing luminance information included in two consecutive frame image data, and can output this as a vector. . The motion vector amount output by the motion vector amount calculation unit 130 is transmitted to the motion vector conversion unit 283 of the lens barrel 200 via the contact unit 310 provided in the mount unit 300.

  Subsequently, an operation example of the camera 1 according to the present embodiment will be described with reference to FIG. FIG. 3 is a flowchart illustrating an operation example of the camera 1 according to the present embodiment. Note that the processing described below is repeated, for example, while a release button (not shown) is half pressed.

  First, in step S101, the angular velocity sensor 220 detects the vibration input to the camera 1, and outputs a detection signal corresponding to the vibration. Then, the detection signal of the angular velocity sensor 220 is acquired by the target position calculation unit 241.

  In step S102, the target position calculation unit 241 calculates the target position of the correction lens 212 for correcting image blur based on the detection signal of the angular velocity sensor 220 acquired in step S101.

  In step S103, the panning detection unit 290 determines whether panning has been performed. If it is determined that panning has been performed, the process proceeds to step S119. On the other hand, if it is determined that panning has not been performed, the process proceeds to step 104.

  In step S <b> 104, the position detection sensor 251 outputs a position signal corresponding to the current position of the correction lens 212. Then, the lens position calculation unit 253 calculates the current position of the correction lens 212 based on the output position signal.

In step S105, the current position of the correction lens 212 calculated in step S104 is subtracted from the target position of the correction lens 212 calculated in step S102 by the fourth subtractor 281 to correct the target position of the correction lens 212 and the correction position. the difference between the current position of the lens 212 is calculated as the bias residual B _r.

In step S <b> 106, the motion vector amount calculation unit 130 of the camera body 100 calculates the motion vector amount V _jk in the shooting screen, and the calculated motion vector amount V _jk is the contact unit provided in the mount unit 300. The data is transmitted to the motion vector conversion unit 283 of the lens barrel 200 via 310.

In step S107, the motion vector amount conversion unit 283 receives the motion vector amount V _jk calculated in step S106, and the motion vector amount V _jk in the shooting screen varies depending on the received motion vector amount V _jk . A determination is made as to whether or not an error has occurred. For example, the motion vector quantity converter 283 divides the photographing screen into a plurality of regions, based on the motion vector quantity V _jk for each region, determining the standard deviation of the motion vector quantity V _jk, resulting standard deviation is given When the value is greater than or equal to the value, it can be determined that there is a variation in the motion vector amount V _jk in the shooting screen. When it is determined that there is no variation in the motion vector amount V _jk , it is determined that the motion vector amount V _jk in the shooting screen has high reliability as the motion vector amount corresponding to the camera shake, and the process proceeds to step S108. On the other hand, if it is determined that the motion vector amount V _jk in the shooting screen has a variation, the motion vector amount in the shooting screen includes a motion vector component other than a camera shake such as a moving object, and is compatible with camera shake. It is determined that the reliability as the motion vector amount to be performed is low, and the process proceeds to step S114. Note that the process of step S107 may be performed by the motion vector amount calculation unit 130.

In step S108, the motion vector amount conversion unit 283 converts the motion vector amount V _jk (with speed as a unit) into a shake residual V _r (with position as a unit) corresponding to the motion vector amount V _jk. Processing is performed. The method of converting the motion vector amount V _jk into the shake residual V _r is not particularly limited. For example, by multiplying the motion vector amount V _jk by a predetermined conversion coefficient, the motion vector amount V _jk is not changed. The difference V _r can be converted.

In steps S109 to S114, the bias residual B _r calculated in step S105 is compared with the shake residual V _r corresponding to the motion vector amount V _jk calculated in step S108, and the bias is determined according to the comparison result. Processing to change the amount is performed.

Specifically, first, in step S109, by the fifth subtracter 282 from the bias residual _{B r} calculated in step S105, the shake residual _{V r} obtained at step S108 is subtracted, the bias residuals The difference between B _r and the shake residual V _r is calculated as the difference U _r .

At step S110, the determination unit 284, a difference _{U r} is greater whether a determination is made than the first reference value thmax. If the difference _{U r} is determined to be larger than the first reference value thmax, the process proceeds to step S111, whereas, if the difference Ur is determined to be equal to or less than the first reference value thmax, the process proceeds to step S112 .

In step S111, the difference _{U r} of the residual _{V r} shake from the bias residual _{B r} were subtracted, since it is determined to be greater than the first reference value thmax, the bias amount calculation unit 261, the bias residual B _r is large with respect to the shake residual V _r , and it is determined that the amount by which the correction lens 212 is moved to the center of the movable range is large by the centering bias function, and the bias amount gain is set to be small.

On the other hand, in step S110, if the difference _{U r} is determined to be equal to or less than the first reference value thmax, the process proceeds to step S112. In step S112, the determination unit 284, a difference _{U r} obtained by subtracting the residual _{V r} shake from the bias residual _{B r} is smaller whether a determination is made than the second reference value thmin. If the difference _{U r} is determined to be less than the second reference value thmin, the process proceeds to step S113, whereas, if the difference _{U r} is determined to be the second reference value thmin above, step S114 move on.

In step S113, the difference _{U r} of the residual _{V r} shake from the bias residual _{B r} were subtracted, since it is determined to be smaller than the second reference value thmin, the bias amount calculation unit 261, the bias residual B _{It is determined that r} is smaller than the shake residual V _r , and the amount by which the correction lens 212 is moved to the center of the movable range is small by the centering bias function, and the bias amount gain is set to be large.

Further, in step S107, if the variation in the motion vector quantity _{V jk} is determined to be occurring, and, in step S112, the difference _{U r} of the residual _{V r} shake from the bias residual _{B r} obtained by subtracting the second Is determined to be equal to or greater than the reference value thmin (that is, when the difference U _r is determined to be equal to or less than the first reference value and equal to or greater than the second reference value thmin), step S114. Proceed to In step S114, the bias amount calculation unit 261 determines that the shake residual V _r and the bias residual B _r correspond to each other and it is not necessary to change the bias amount, and sets the gain of the bias amount to the initial value. Processing to return to is performed.

  In step S115, the bias amount calculation unit 261 calculates the bias amount based on the gain of the bias amount set in steps S111, 113, and 114 and the current position of the correction lens 212 calculated in step S104. Is done. The calculated bias amount is input to the second subtractor 262, and the control position of the correction lens 212 on which the bias amount is superimposed is calculated.

  In step S116, the drive signal calculation unit 271 calculates a drive signal for driving the correction lens 212 at the control position of the correction lens 212. In subsequent step S117, the drive unit 273 calculates the drive signal based on the drive signal. Then, the correction lens 212 is driven.

  In step S118, the bias amount calculation unit 261 writes the gain of the bias amount set in steps S111, 113, and 114 to the nonvolatile memory 264.

  If it is determined in step S103 that panning has been performed, the process proceeds to step S119. In step S119, the correction lens 212 is driven to a position corresponding to panning. For example, the correction lens 212 is driven to the center position of the movable range of the correction lens 212.

  As described above, the camera 1 according to this embodiment operates.

Thus, in the present embodiment, the target position of the compensation lens 212 based on the detection signal of the angular velocity sensor 220, the difference between the current position of the correcting lens 212 which bias amount is superimposed, determined as the bias residual B _r, The bias residual B _r is compared with the shake residual V _r corresponding to the motion vector amount V _jk in the shooting screen. Here, theoretically, if there is no influence of the fluctuation component by the photographing environment, so that the motion vector quantity V _jk in accordance with the bias residual B _r is calculated. That is, when there is no influence of the fluctuation component due to the shooting environment, the shake residual V _r corresponding to the motion vector amount V _jk corresponds to the bias residual B _r . Therefore, in this embodiment, if the difference U _r between the bias residual B _r and the shake residual V _r is equal to or less than the first reference value thmax and equal to or greater than the second reference value thmin, the remaining shake remains. The difference V _r corresponds to the bias residual B _r , and it is determined that there is no influence of the fluctuation component due to the photographing environment, and the bias amount gain is left at the initial value. On the other hand, the difference _{U r} of the residual _{V r} shake from the bias residual _{B r} by subtracting is greater than a predetermined first reference value thmax, or difference _{U r} is than the predetermined second reference value thmin Is smaller, the shake residual V _r does not correspond to the bias residual B _r , and it is determined that there is an influence of a fluctuation component or the like due to the photographing environment, and processing for changing the gain of the bias amount is performed. . Specifically, when the difference U _r between the bias residual B _r and the shake residual V _r is larger than the first reference value thmax, the bias residual B _r is larger than the shake residual V _r . The centering bias function determines that the amount by which the correction lens 212 is moved toward the center of the movable range is large, and sets the gain of the bias amount to be small. On the other hand, when the difference U _r between the bias residual B _r and the shake residual V _r is smaller than the second reference value thmin, the bias residual B _r is smaller than the shake residual V _r , and the centering bias It is determined that the amount by which the correction lens 212 is moved to the center of the movable range by the function is small, and the gain of the bias amount is set to be large. Thereby, in this embodiment, even when the shake residual V _r corresponding to the motion vector amount V _jk in the shooting screen does not correspond to the bias residual B _r , the bias amount can be set to an appropriate value. Therefore, camera shake correction can be performed with higher accuracy.

  The embodiment described above is described for facilitating understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

For example, in the above-described embodiment, the configuration in which the gain of the bias amount is changed according to the comparison result between the bias residual B _r and the shake residual V _r is illustrated, but the configuration is not limited to this configuration. For example, the calculation result of the correction lens target position by the target position calculation unit 241 may be changed according to the comparison result between the bias residual B _r and the shake residual V _r . For example, as shown in FIG. 4, the target position calculation unit 241 acquires the determination result of the determination unit 284, the result of the determination, the difference U _r of the deflection residual V _r from the bias residual B _r and subtraction, the If greater than the first reference value thmax sets the gain of the target position of the correction lens 212 in Chisanaru so, whereas the difference U _r of the residual V _r shake from the bias residual B _r obtained by subtracting the second If it is smaller than the reference value thmin, the gain at the target position of the correction lens 212 may be set to be large.

In the above-described embodiment, the configuration in which the correction lens 212 built in the lens barrel 200 is moved to correct the image blur is exemplified. However, the configuration is not limited to this configuration. The built-in image sensor 110 may be moved to correct image blur. For example, in a camera body in which the image sensor 110 is held so as to be movable in a direction crossing the optical axis, the image sensor 110 is configured by superimposing a bias amount on a target position based on a detection result of an angular velocity sensor. It is good also as a structure which performs camera shake correction | amendment by moving to a control position. In this case, the target position of the imaging device 110, the difference between the current position of the imaging device 110 bias amount is superimposed is calculated as the bias difference B _r, a bias residual B _r calculated, the motion vector amount of the object comparing the deflection residual V _r corresponding image pickup element 110, the result of the comparison, if the difference U _r between residual V _r runout bias residual B _r is large, the movable image pickup device 110 by the centering bias function it is determined that the amount of lapping in the center of the range is large, while set smaller the gain of the bias amount with respect to the imaging device 110, when the difference U _r between residual V _r runout bias residual B _r is small Then, the centering bias function determines that the amount of moving the image sensor 110 to the center of the movable range is small, and increases the gain of the bias amount for the image sensor 110. Sea urchin may be configured to be set. In this case, the angular velocity sensor 220, the target position calculation unit 241, the bias amount calculation unit 261, the motion vector amount conversion unit 283, the determination unit 284, the subtractors 262, 263, 281 and 282 shown in FIG. It is preferable that the main body 100 has a configuration. As a result, in the camera main body 100, the motion vector amount V _jk can be calculated based on the image signal captured by the image sensor 110, and the shake residual V _r corresponding to the motion vector amount V _jk is calculated. Therefore, camera shake correction according to the present embodiment can be performed by the camera body 100.

Furthermore, in the above-described embodiment, the configuration in which the above-described camera shake correction processing is performed while the release button is half-pressed is illustrated, but the configuration is not limited to this configuration, and for example, the image blur is maximized. Only in such a case, a configuration in which camera shake correction processing is performed may be employed. Alternatively, the bias residual B _r immediately before the exposure of the image sensor 110 is started and the shake residual V _r are compared only immediately before the release button is fully pressed and the exposure of the image sensor 110 is started. The bias amount gain may be changed. In this way, by specifying the timing for performing camera shake correction, the calculation load can be reduced. Whether or not the exposure of the image sensor 110 is started can be determined by whether or not an exposure start signal of the image sensor 110 transmitted from the camera body 100 is received, for example. Such a configuration can also be applied to a configuration in which image blur is corrected by moving the image sensor 110 as described above in a direction intersecting the optical axis L1. In this case, it is possible to determine whether or not the release button has been fully pressed in the camera body 100 and perform camera shake correction only immediately before the exposure of the image sensor 110 is started.

  The camera 1 according to the present embodiment is not particularly limited, and the present invention may be applied to other optical devices such as a single-lens reflex digital camera, a digital compact camera, a digital video camera, and a camera for a mobile phone. Good.

DESCRIPTION OF SYMBOLS 1 ... Single-lens reflex digital camera 100 ... Camera body 110 ... Image pick-up element 120 ... Image processing part 130 ... Motion vector amount calculating part 200 ... Lens barrel 212 ... Correction lens 220 ... Angular velocity sensor 241 ... Target position calculation part 251 ... Position detection sensor 253: Lens position calculation unit 261: Bias amount calculation unit 262 ... Second subtractor 263 ... Third subtractor 271 ... Drive signal calculation unit 272 ... Motor driver 273 ... Drive unit 281 ... Fourth subtractor 282 ... Second 5 subtractor 283 ... motion vector amount conversion unit 284 ... determination unit 290 ... panning detection unit

Claims (10)

A vibration detection unit that detects vibration and outputs a detection signal corresponding to the vibration;
A shake correction unit having a shake correction optical system movable in a direction intersecting the optical axis;
A drive unit that drives the shake correction unit to correct image shake;
A receiving unit that receives a motion vector amount of a subject based on an image signal captured by an image sensor;
Based on the detection signal, an image shake amount calculation unit that calculates an image shake amount;
A bias amount calculation unit that calculates, as a bias amount, a centripetal force for moving the shake correction optical system to the center of a movable range of the shake correction optical system according to the position of the shake correction optical system;
A bias residual calculator that calculates a difference between the image blur amount and the image blur amount on which the bias amount is superimposed as a bias residual;
A control unit that compares the bias residual with a shake residual of the shake correction optical system corresponding to the motion vector amount, and changes the bias amount based on the comparison result. Lens barrel to be used. The lens barrel according to claim 1,
The control unit changes the bias amount to be smaller when the difference between the bias residual and the shake residual is larger than a first reference value, and the difference becomes a second reference When the value is smaller than the value, the bias amount is changed so as to increase. The lens barrel according to claim 1 or 2,
The lens barrel according to claim 1, wherein the image shake amount calculation unit changes the image shake amount based on a result of comparison between the bias residual and the shake residual. In the lens barrel according to any one of claims 1 to 3,
The control unit changes the bias amount when the image blur amount has a maximum value. In the lens barrel according to any one of claims 1 to 4,
The receiving unit is capable of receiving an exposure start signal for starting exposure of the image sensor,
The lens barrel, wherein the control unit changes the bias amount when the exposure start signal is received. A vibration detection unit that detects vibration and outputs a detection signal corresponding to the vibration;
A shake correction unit having an image sensor that can move in a direction intersecting the optical axis;
A drive unit that drives the shake correction unit to correct image shake;
A motion vector amount calculation unit for calculating a motion vector amount of a subject based on an image signal captured by the image sensor;
Based on the detection signal, an image shake amount calculation unit that calculates an image shake amount;
A bias amount calculation unit that calculates, as a bias amount, a centripetal force for moving the image sensor to the center of the movable range of the image sensor according to the position of the image sensor;
A bias residual calculator that calculates a difference between the image blur amount and the image blur amount on which the bias amount is superimposed as a bias residual;
A control unit that compares the bias residual and a shake residual of the image sensor corresponding to the motion vector amount, and changes the bias amount based on the comparison result. apparatus. The imaging device according to claim 6,
The control unit changes the bias amount to be smaller when the difference between the bias residual and the shake residual is larger than a first reference value, and the difference becomes a second reference If the value is smaller than the value, the bias amount is changed so as to increase. In the imaging device according to claim 6 or 7,
The image shake amount calculation unit changes the image shake amount based on a result of comparison between the bias residual and the shake residual. In the imaging device in any one of Claims 6-8,
The control unit is configured to change the bias amount when the image blur amount has a maximum value. In the imaging device in any one of Claims 6-9,
The image pickup apparatus, wherein the control unit changes the bias amount immediately before the exposure of the image pickup element is started.

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