JP2016136242A - Control device, optical apparatus, and lens device - Google Patents

Control device, optical apparatus, and lens device Download PDF

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Publication number
JP2016136242A
JP2016136242A JP2015245297A JP2015245297A JP2016136242A JP 2016136242 A JP2016136242 A JP 2016136242A JP 2015245297 A JP2015245297 A JP 2015245297A JP 2015245297 A JP2015245297 A JP 2015245297A JP 2016136242 A JP2016136242 A JP 2016136242A
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Prior art keywords
angular velocity
shake correction
panning
shake
lens
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JP2015245297A
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JP2016136242A5 (en
Inventor
今田 信司
Shinji Imada
今田  信司
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キヤノン株式会社
Canon Inc
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Priority to JP2015006934 priority
Application filed by キヤノン株式会社, Canon Inc filed Critical キヤノン株式会社
Priority claimed from US14/994,420 external-priority patent/US9900513B2/en
Publication of JP2016136242A publication Critical patent/JP2016136242A/en
Publication of JP2016136242A5 publication Critical patent/JP2016136242A5/en
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Abstract

PROBLEM TO BE SOLVED: To provide a control device that is advantageous for panning shake correction.SOLUTION: There is provided a control device comprising: a shake correction control part (124a) that performs shake correction control of an optical apparatus by driving a shake correction element; and a calculation part (124b) that determines a panning angular velocity for tracking a subject on the basis of an output from a shake detection part detecting a shake applied to the optical apparatus and an output from a motion vector detection part detecting a motion vector indicating a motion of the subject, where the shake correction control part determines whether to drive the shake correction element according to a difference between the panning angular velocity and an angular velocity of the optical apparatus acquired on the basis of the output from the shake detection part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a control device that controls driving of an image blur correction member, and more particularly to a control device that controls driving of an image blur correction member during panning.

In order to correct the image blur caused by camera shake, etc., the camera shake is detected, and the image blur correction lens and the image sensor (image blur correction member) are moved according to the detection result. This is done by changing the axis. In principle, camera vibration is detected by a shake sensor that detects angular acceleration, angular velocity, etc., and a means for outputting an angular displacement by electrically or mechanically integrating the output signal of the shake sensor. It can be done by mounting. Based on this detection information, an image blur correction member that decenters the photographic optical axis is driven, and the position of the image blur correction member is detected and feedback control is performed so that accurate image blur suppression can be performed. Proposed. (For example, Patent Document 1)
There is also panning as one of the methods of shooting with a camera. This is, for example, a technique in which the camera follows the movement of the main subject moving in the horizontal direction.A good panning shot is a photo in which the main subject is stationary and the background is the main subject. It is a photograph flowing in the moving direction. At this time, it is common to shoot with a slow shutter speed in order to make the subject feel lively. Experience is required to make the camera follow the movement of the subject accurately, and since the shutter speed is slow, shake is likely to occur, which is a relatively difficult shooting technique for beginners. Therefore, Patent Document 2 proposes a technique for assisting panning by using an image blur correction member. As a specific method, the moving speed of the main subject on the imaging surface is detected, and the main subject moving speed is calculated from the difference from the panning speed performed by the photographer. During exposure, a difference between the calculated main subject moving speed and the panning speed performed by the photographer, that is, a panning speed error is detected. By decentering the optical system so as to correct the error, the photographer can take a beautiful panning shot.

JP-A-7-218967 JP 2007-139552 A

  The invention described in Patent Document 2 is based on the premise that the main subject targeted by the photographer matches the main subject recognized by the camera. However, when there are a plurality of subjects, it is difficult for the camera to determine which subject the photographer is mainly panning and misrecognition is also possible. In addition, the moving speed of the main subject may change greatly, and the panning speed may not be accurately detected. In such a case, when the panning speed error correction of the invention described in Patent Document 2 is performed, there is a problem that the main subject that the photographer is aiming at may shake.

  In view of the above problems, an object of the present invention is to provide a control device, an optical apparatus, and a lens device that are advantageous for panning shake correction.

  A control apparatus according to one aspect of the present invention includes a shake correction control unit that performs shake correction control of an optical device by driving a shake correction element, an output from a shake detection unit that detects a shake applied to the optical device, and A control unit that calculates a panning angular velocity for following the subject based on an output from a motion vector detection unit that detects a motion vector indicating the motion of the subject, the shake correction The control unit determines whether to drive the shake correction element according to a difference between the panning angular velocity and the angular velocity of the optical device acquired based on the output of the shake detection unit. And

  Other objects and features of the present invention are illustrated in the following examples.

  According to the present invention, it is possible to provide a control device, an optical apparatus, and a lens device that are advantageous for panning shake correction.

It is a block diagram showing the camera system of this invention. It is a figure showing the imaging | photography method at the time of panning photography of this invention. It is a figure showing each signal waveform at the time of panning photographing of the present invention. It is a figure showing each signal waveform at the time of panning photographing of the present invention. It is a figure showing each signal waveform at the time of panning photographing of the present invention. It is a flowchart which shows operation | movement of the camera of this invention. It is a flowchart which shows operation | movement of the interchangeable lens of this invention. It is a flowchart which shows operation | movement of the interchangeable lens of this invention. 3 is a flowchart illustrating an image blur correction operation according to the first embodiment of the present invention. 7 is a flowchart illustrating an image blur correction operation according to the second embodiment of the present invention. 12 is a flowchart illustrating an image blur correction operation according to the third embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[First Embodiment]
Hereinafter, the configuration of a camera system (optical apparatus) according to an embodiment of the present invention will be described with reference to FIG. The camera system includes a camera body 111 and an interchangeable lens 112. The imaging light flux from the subject passes through the imaging optical system of the interchangeable lens 112 and forms an image on the imaging unit 113 of the camera body 111. The formed image is photoelectrically converted by the imaging unit 113 into an imaging signal. The imaging signal is amplified by the gain control circuit 115, input to the A / D converter 116, and converted from analog to digital image data. Reference numeral 117 denotes a video signal processing circuit that performs filter processing, color conversion processing, gamma processing, and the like on the image data digitized by the A / D converter 116. The motion vector of the subject image is calculated by this video signal processing circuit 117. That is, in the present embodiment, the video signal processing circuit 117 functions as a motion vector detection unit that detects a motion vector within the screen (on the imaging surface) of the subject. The image signal processed by the video signal processing circuit 117 is stored in the buffer memory 118 and displayed on the LCD 119 or recorded on the removable memory card 120.

  The operation unit 121 is a switch for setting the shooting mode of the camera, setting the recording image file size, and releasing at the time of shooting. The camera system control MPU (camera MPU) 114 controls the above operation of the camera body 111 and also communicates with the lens MPU 124 via the interface circuit 122 on the camera body 111 side and the interface circuit 123 on the interchangeable lens 112 side. . In this communication, various data are exchanged between the digital camera body 111 and the interchangeable lens 112.

  In the interchangeable lens 112, a focus lens 125, a zoom lens 126, an image blur correction lens 127, and a diaphragm 128 are disposed as a part of the photographing optical system.

  The focus lens 125 is driven by a control signal from the lens MPU 124 via the focus control circuit 129 and the focus lens driving motor 130. In addition to the focus lens driving circuit, the focus control circuit 129 includes a focus encoder that outputs a zone pattern signal and a pulse signal according to the movement of the focus lens. The subject distance can be detected by this focus encoder.

  The zoom lens 126 moves when the photographer operates a zoom operation ring (not shown). The zoom encoder 131 outputs a zone pattern signal corresponding to the movement of the zoom lens. The photographic image magnification is obtained by the lens MPU 124 reading signals from the focus encoder and zoom encoder 131 and reading out pre-stored photographic image magnification data based on a combination of subject distance and focal length.

  The image blur correction lens 127 is driven in the vertical and horizontal directions as indicated by arrows in FIG. 1 via an image blur correction control circuit (IS control circuit) 132 and a linear motor 133. Therefore, the image blur correction control circuit 132 and the linear motor 133 move the image blur correction lens 127 (optical element, optical member) in the vertical direction (first direction) and the horizontal direction (second direction orthogonal to the first direction). ) To be driven. Image blur correction is performed as follows. That is, the shake signal of the angular velocity sensor 135 that detects the rotational shake of the camera system (optical device) is processed by the signal processing circuit 136 and input to the lens MPU 124. Here, the angular velocity sensor 135 only needs to have a function as a shake detection unit that detects the shake of the optical apparatus, and may be a shake sensor that can detect angular acceleration, acceleration, and the like. The shake correction control unit 124a included in the lens MPU 124 calculates a correction lens drive target signal and outputs a drive signal corresponding to the difference between the correction lens drive target signal and the correction lens position signal output from the correction lens encoder 134. This is output to the shake correction control circuit 132. Image blur correction is performed by feeding back the correction lens position signal output from the correction lens encoder 134 to the image blur correction control circuit 132 in this way. Note that the above-described image blur correction control is performed on each of the two axes of the pitch axis for detecting the vertical tilt and the yaw axis for detecting the horizontal tilt with the camera body 111 as the center. In this manner, the lens MPU 124 drives the image blur correction lens 127 (optical element, optical member) in the vertical direction (first direction) and the horizontal direction (second direction orthogonal to the first direction). It functions as a shake correction control unit to be controlled. That is, the drive unit for driving the image blur correction lens 127 is controlled. Therefore, the control device that controls the driving of the image blur correction lens 127 (image blur correction member) is configured by the lens MPU 124, and the image blur correction device includes the lens MPU 124, the image blur correction control circuit 132, and the linear motor 133. Is configured. The lens MPU 124 includes a reference angular velocity calculation unit 124b and a determination unit 124c in addition to the shake correction control unit 124a described above. The reference angular velocity calculation unit 124b is an ideal panning angular velocity (first angular velocity corresponding to the moving speed of the subject) that allows the subject to continue to follow in the screen (on the imaging surface) without shaking during panning shooting. Is calculated (detected). The determination unit 124c has a predetermined difference between the ideal panning angular velocity (first angular velocity) obtained by the reference angular velocity calculation unit 124b and the angular velocity (second angular velocity) detected by the angular velocity sensor 135 during the panning shooting. It is determined whether or not the value is larger. The operations of the reference angular velocity calculation unit 124b and the determination unit 124c will be described later.

  The diaphragm 128 is driven via a diaphragm control circuit 137 and a stepping motor 138 by a control signal from the lens MPU 124.

  The switch 139 is a switch for selecting image blur correction ON / OFF and image blur correction operation mode. As the image blur correction mode, a normal image blur correction operation mode and a panning operation mode can be selected.

  Next, the panning method of the present invention will be described with reference to FIGS.

  FIG. 2 shows the movements of the subject and the camera in time series of FIGS. 2A and 2B when the subject passing in front of the subject is shot by the panning method. During panning, the camera is shaken so as to match the moving speed of the subject even during the exposure period, so that the movement of the subject is stopped and a photograph with the background flowing can be taken. However, when the photographer is unfamiliar or the like, the aim may be shifted to C1 in FIG. 2B, for example, even if the user is aiming at the center C0 of the subject and shaking the camera in accordance with the movement of the subject.

  Thus, FIG. 3 shows the output of the angular velocity sensor 135 and the waveform of the motion vector amount of the subject image detected by the video signal processing circuit 117 when the aim is shifted in the panning shooting. 3A shows an output waveform of the angular velocity sensor 135, and FIG. 3B shows a motion vector signal waveform. In FIG. 3A, if the subject speed is constant, the ideal panning angular speed at which the subject keeps chasing without shaking becomes a constant angular speed as indicated by a dotted line. If the subject continues to follow without being shaken, the motion vector of the subject in FIG. 3B is “0”. However, it is difficult to keep track of the moving subject accurately, and in actuality, it deviates from the ideal panning angular velocity as in the angular velocity waveform at the time of panning shown by the solid line in FIG. The motion vector at this time also deviates from “0” as shown in FIG.

  Therefore, if the image blur correction lens 127 is driven so as to correct the deviation from the ideal panning angular velocity, the blur of the subject can be corrected. As an actual photographing operation, an ideal panning angular velocity is calculated before exposure, and the image blur correction lens 127 is driven so as to correct a deviation from the ideal panning angular velocity during exposure.

  Here, as a method of calculating the ideal panning angular velocity, there is a method of storing the output of the angular velocity sensor 135 when the motion vector is in the vicinity of “0”, that is, when it is equal to or less than a predetermined amount. FIG. 4 shows the output waveform and motion vector signal waveform of the angular velocity sensor 135 similar to FIG. In FIG. 4B, t0 to t2 are timings when the motion vector is a predetermined value or less, and the output of the angular velocity sensor at that timing may be stored as an ideal panning angular velocity. In this case, the panning angular velocity stored at the timing t0 closest to the start of exposure is set as an ideal panning angular velocity, which is a reference panning angular velocity (first angular velocity) for correction during exposure.

  However, when the subject (main subject) that the photographer wants to pan and the subject determined by the video signal processing circuit 117 are different or the motion vector cannot be accurately detected, before the exposure starts as shown in FIG. The difference between the reference panning angular velocity W0 and the detected angular velocity becomes large. In this state, if the operation is performed so as to correct the deviation from the reference panning angular velocity during exposure, there is a possibility that the shake is increased. Therefore, if the difference between the reference panning angular velocity W0 (first angular velocity) and the detected angular velocity (second angular velocity) is greater than the panning correction threshold Ws (predetermined value) before the exposure starts, the panning error during exposure will occur. The point of the present invention is not to operate the correction.

  The above operation will be described with reference to the flowcharts of FIGS.

  First, the photographing operation on the camera body 111 side will be described with reference to the flowchart of FIG. The flow in FIG. 6 is controlled by the camera MPU 114.

  If the main switch is turned on on the camera body 111 side, the operation starts from step S601.

  In step S601, it is determined whether or not the release switch in the operation unit 121 of the camera body 111 is half-pressed (SW1ON). If half-pressed, the process proceeds to step S602, and if not half-pressed, the processing here ends.

  In step S602, camera lens status communication is performed with the lens MPU 124 via the interface circuits 122 and 123. Here, the state of the camera body 111 (release switch state SW1 ON, shooting mode, shutter speed, etc.) is transmitted to the interchangeable lens 112, and the state of the interchangeable lens 112 (focal length, aperture state, focus lens drive state, etc.) ). Although the camera lens status communication is described only in the main part in the flowchart of the present embodiment, it is performed at any time when the camera state changes or when the camera wants to check the lens state.

  In step S603, since the release switch is pressed halfway (SW1ON), the focus lens drive amount for focusing on the subject is calculated.

  In step S604, the focus lens drive amount (focus lens drive command) is transmitted to the interchangeable lens 112. This data is transmitted, for example, as a drive target pulse amount of the focus encoder.

  In step S605, distance measurement is performed again when the focus lens drive is completed.

  In step S606, it is determined whether or not it is within the in-focus depth. If it is within the in-focus depth, the process proceeds to step S607. If it is not within the in-focus depth, the process returns to step S601, and the operations of steps S601 to S605 are performed again.

  In step S607, the luminance information from the video signal processing circuit 117 is obtained, and the exposure time Tv and the aperture value (aperture drive amount) are calculated.

  In step S608, the main subject (subject) is determined from the image signal of the video signal processing circuit 117.

  In step S609, motion vector information of the main subject is detected.

  In step S610, the detected motion vector information of the main subject is transmitted to the lens MPU 124.

  In step S611, it is determined whether or not the release switch in the operation unit 121 of the camera body 111 has been fully pressed (SW2ON). If it is fully pressed, the process proceeds to step S612. If not fully depressed, the process returns to step S601 and the operations of steps S601 to S610 are performed again.

  In step S612, the aperture drive amount obtained in step S607 is transmitted to the interchangeable lens 112, and the aperture 128 is driven.

  In step S613, the charge of the imaging unit 113 is reset and the electronic shutter is driven.

  In step S614, the subject image is exposed to the imaging unit 113 to accumulate charges.

  In step S615, when the exposure time has elapsed, a rear curtain shutter (not shown) is driven to complete the exposure.

  In step S616, charge transfer (reading) from the imaging unit 113 is performed.

  In step S <b> 617, the read captured image signal is converted into digital data via the gain control circuit 115 and the A / D converter 116 and stored in the buffer memory 118.

  In step S618, a stop opening command is transmitted to the interchangeable lens 112, and the stop 128 is returned to the open position.

  In step S619, image correction processing such as gamma correction and compression processing is performed on the captured image signal.

  In step S620, the image data subjected to the image correction process is displayed on the LCD 119 and recorded in the memory card 120, and a series of operations up to photographing is completed.

  Next, the operation on the interchangeable lens 112 side will be described with reference to the flowcharts shown in FIGS. The flow in FIGS. 7 to 9 is controlled by the lens MPU 124.

  When the interchangeable lens 112 is attached to the camera body 111, serial communication is performed from the camera body 111 to the interchangeable lens 112, and the operation starts from step S701 in FIG.

  In step S701, initial settings for lens control and image blur correction control are performed.

  In step S702, the state of switches (not shown) and the position of zoom / focus are detected. Examples of the switches include a switch for switching between auto focus and manual focus, and an ON / OFF switch for an image blur correction function.

  In step S703, it is determined whether there has been a focus drive command communication from the camera body 111. If a focus drive command has been received, the process proceeds to step S704, and if not received, the process proceeds to step S708.

  In step S704, the target driving amount (number of pulses) of the focus lens is also transmitted in the focus driving command communication from the camera body 111. Therefore, focus drive control is performed so that the number of pulses of the focus encoder in the focus control circuit 129 is detected and the target number of pulses is driven.

  In step S705, it is determined whether the target pulse number P has been reached. If the target has been reached, the process proceeds to step S706, and if not, the process proceeds to step S707.

  In step S706, since the target number of pulses has been reached, driving of the focus lens is stopped.

  In step S707, since the target number of pulses has not been reached, the speed of the focus lens driving motor 130 is set according to the number of remaining driving pulses. Decreases as the number of remaining drive pulses decreases.

  In step S708, if the image blur correction function ON / OFF switch OFF is detected in step S702, the image blur correction lens 127 is locked to the optical axis center. If ON is detected and the release switch SW1 ON of the camera is detected by camera lens status communication, the lock is released (unlocked), and the image blur correction operation is enabled.

  In step S709, it is determined whether a command to stop all driving (stop driving all actuators in the lens) is received from the camera body 111. If no operation is performed on the camera body 111 side, the camera body 111 transmits this all drive stop command after a while. If an all drive stop command is received, the process proceeds to step S710, and if not received, the process returns to step S702.

  In step S710, full drive stop control is performed. Here, all actuator driving is stopped, and the microcomputer is put into a sleep (stopped) state. Power supply to the image shake correction apparatus is also stopped. Thereafter, when any operation is performed on the camera body 111 side, the camera body 111 sends a communication to the interchangeable lens 112 to cancel the sleep state.

  During these operations, if there is a request for serial communication interruption or image blur correction control interruption by communication from the camera body 111, such interruption processing is performed.

  The serial communication interrupt process decodes communication data and performs lens processing such as aperture driving and focus lens driving according to the decoding result. Then, SW1ON, SW2ON, shutter speed, camera model, and the like can be determined by decoding the communication data.

  The image blur correction interrupt is a timer interrupt that is generated at regular intervals, and performs pitch direction (vertical direction) control and yaw direction (horizontal direction) image blur correction control.

  First, the serial communication interrupt will be described with reference to the flowchart of FIG.

  When the communication from the camera body 111 is received, the operation starts from step S801.

  In step S801, an instruction (command) from the camera body 111 is analyzed, and the process branches to a process corresponding to each instruction.

  In step S802, since the focus drive command has been received, in step S803, the speed of the focus lens drive motor 130 is set according to the target drive pulse number, and focus lens drive is started.

  In step S804, since the aperture drive command has been received, the drive pattern of the stepping motor 138 is set in step S805 in order to drive the aperture 128 based on the transmitted aperture drive data. Then, the set drive pattern is output to the stepping motor 138 via the aperture control circuit 137 to drive the aperture 128.

  In step S806, since the camera lens status communication is received, in step S807, the focal length information of the interchangeable lens 112, the IS operation state, and the like are transmitted to the camera body 111. In addition, it receives the status status of the camera body 111 (release switch status, shooting mode, shutter speed, etc.).

  In step S808, since the subject information reception command is received, the motion vector information of the subject received in step S809 is stored in the RAM in the lens MPU 124.

  In step S810, there are other commands such as lens focus sensitivity data communication and lens optical data communication, and these processes are performed in step S811.

  Next, image blur correction interruption will be described with reference to the flowchart of FIG.

  When an image blur correction interrupt occurs during the main operation of the interchangeable lens 112, the lens MPU 124 starts image blur correction control from step S901 in FIG.

  In step S901, the output signal obtained by processing the signal of the angular velocity sensor 135 by the signal processing circuit 136 is A / D converted.

  In step S902, the state of the switch 139 is determined to determine whether it is the panning mode (first mode) or the normal image stabilization mode (second mode). The process proceeds to step S903, and if it is the panning mode, the process proceeds to step S906.

  In step S903, a high-pass filter operation is performed to cut low frequency components. The high-pass filter time constant is switched for a predetermined time from the start of calculation, and an operation for quickly stabilizing the signal is also performed.

  In step S904, the integration calculation is performed with the calculation result of the high-pass filter as an input. This result is angular displacement data.

  In step S905, the image stabilization sensitivity corresponding to the zoom position and the focus position is read, and the target drive amount of the shake correction lens 127 is calculated from the angular displacement data.

  In step S906, since the panning mode is selected, it is determined whether SW2 is ON, that is, whether the exposure operation is selected. If SW2 is OFF (that is, before the start of exposure), the process proceeds to step S907. If SW2 is ON (that is, if it is the exposure start timing), the process proceeds to step S909.

  In step S907, a reference panning angular velocity W0 (first angular velocity) is set. The reference panning angular velocity W0 is set from the amount of motion vector of the subject and the signal from the angular velocity sensor 135. That is, the reference angular velocity calculation unit 124b calculates (detects) a reference panning angular velocity W0 (first angular velocity) corresponding to the moving speed of the subject, and sets it by storing it in a storage unit (not shown).

  In step S908, the target drive amount is set to zero. This is because, when SW2 is not ON, the image blur correction lens 127 is electrically held at the center.

  In step S909, it is determined whether the determination as to whether or not to perform panning correction has been completed. If completed, the process proceeds to step S914. If not completed, the process proceeds to step S910.

  In step S910, since it is not determined whether or not the panning correction is performed, it is determined whether or not the difference between the reference panning angular velocity W0 and the angular velocity sensor signal W is larger than a predetermined angular velocity WS (predetermined value). Do. That is, the determination unit 124c determines whether or not the difference between the reference panning angular velocity W0 (first angular velocity) and the angular velocity (second angular velocity) based on the output of the angular velocity sensor 135 is greater than the predetermined angular velocity WS (predetermined value). judge. In this embodiment, the determination unit 124c performs the above determination at the timing when SW2 is turned on (that is, the timing at which exposure starts). If it is greater than the predetermined value, no panning correction is performed, and the process proceeds to step S915. If it is not larger than the predetermined value (if it is equal to or smaller than the predetermined value), since the panning correction is performed, the process proceeds to step S911.

  In step S911, it is determined that the panning correction is performed, and the fact that the determination is completed is stored.

  In step S912, the difference between the reference panning angular velocity W0 and the angular velocity sensor signal W is integrated and angular displacement data is calculated. This is the angular displacement data of the panning error.

  In step S913, the image stabilization sensitivity corresponding to the zoom position and the focus position is read, and the target drive amount of the image shake correction lens 127 is calculated from the angular displacement data.

  In step S914, it is determined whether or not the panning correction is performed. If so, the process proceeds to step S912 to perform panning correction. If it has stopped, it will progress to step S915.

  In step S915, it is determined that the panning correction is not performed, and the fact that the determination is completed is stored.

  In step S916, since the panning correction is not performed, the target drive amount is set to 0 in order to electrically maintain the image blur correction lens 127 in the center holding state. In other words, when the determination unit 124c determines that the difference between the first angular velocity and the second angular velocity is greater than the predetermined angular velocity WS (predetermined value), the lens MPU 124 restricts driving of the image blur correction lens 127 ( Control to stop).

  In step S917, the signal of the correction lens encoder 134 that detects the amount of eccentricity of the image blur correction lens 127 is A / D converted, and the A / D result is stored in the RAM area in the lens MPU 124.

  In step S918, feedback calculation is performed.

  In step S919, a phase compensation calculation is performed in order to obtain a stable control system.

  In step S920, the calculation result of step S919 is output as PWM to the port of the lens MPU 124, and the image blur correction interruption is completed. The output is input to a driver circuit in the IS control circuit 132, the image blur correction lens 127 is driven by the linear motor 133, and image blur correction is performed.

  As described above, it is determined whether or not the difference between the reference angular velocity of the panning shot and the detected angular velocity is greater than a predetermined value at the exposure start timing, and whether or not to perform the panning correction is determined. Specifically, if the difference between the reference angular velocity of the panning shot and the detected angular velocity is equal to or smaller than a predetermined value, the panning correction is performed during exposure, and if it is larger than the predetermined value, the panning reference angular velocity can be accurately set. Judgment is not made and panning shake correction is not performed. By operating in this way, it is possible to easily shoot beautiful panning shots, and conversely, if there is a possibility of increasing shake, adverse effects can be obtained by stopping panning shake correction. Can be prevented.

  Here, the predetermined value is determined based on the maximum drive range of the image blur correction lens 127. When the difference between the reference angular velocity of the panning shot and the detected angular velocity becomes too large, the driving amount of the image blur correction lens 127 necessary for performing panning shot correction increases. Therefore, based on the maximum drive range of the image blur correction lens 127 so that the drive amount of the image blur correction lens 127 necessary for performing the panning correction does not exceed the driveable range of the image blur correction lens 127. It is preferable to determine the predetermined value described above.

In this embodiment, when the difference between the reference angular velocity of the panning shot and the detected angular velocity is larger than a predetermined value, the driving of the image blur correction lens 127 is stopped and the panning shake correction is not performed. Here, when the above-described difference is larger than a predetermined value, an increase in image blur may be prevented by narrowing the driveable range of the image blur correction lens 127. By reducing the drive amount of the image blur correction lens 127, it is possible to avoid a large influence of image blur.
[Second Embodiment]
Hereinafter, an image blur correction operation according to the second embodiment of the present invention will be described with reference to the flowchart of FIG.

  The configuration of the camera system is the same as in FIG.

  In this embodiment, if the difference between the reference panning angular velocity and the detected angular velocity is greater than a predetermined value during exposure, the correction lens is moved to the current position without updating the target driving amount for panning shake correction. By holding it, the panning correction is stopped.

  In FIG. 10, steps S1001 to S1008 and steps S1012 to S1015 are the same operations as those in the flowchart of FIG.

  In step S1009, it is determined whether or not the difference between the reference panning angular velocity W0 and the angular velocity sensor signal W is greater than a predetermined angular velocity WS. In this embodiment, the determination unit 124c performs the above determination from when SW2 is turned on until it is turned off (that is, during the exposure period). If it is larger than the predetermined value, since the panning correction is stopped at that time, the target drive amount is not calculated and the process proceeds to step S1012. In other words, the shake correction control unit 124a drives the image shake correction lens 127 when the determination unit 124c determines that the difference between the first angular velocity and the second angular velocity is greater than the predetermined angular velocity WS (predetermined value). Control to limit (pause). That is, the driving of the image blur correction lens 127 is temporarily stopped, and the image blur correction lens 127 is held at the temporarily stopped position. If it is not larger than the predetermined value (if it is equal to or smaller than the predetermined value), the panning correction is continued, and the process proceeds to step S1010.

  In step S1010, the difference between the reference panning angular velocity W0 and the angular velocity sensor signal W is integrated and angular displacement data is calculated. This is the angular displacement data of the panning error.

  In step S1011, the image stabilization sensitivity corresponding to the zoom position and the focus position is read, and the target drive amount of the image shake correction lens 127 is calculated from the angular displacement data. Then, the process proceeds to step S1012, where lens driving for panning correction is performed.

As described above, when the difference between the reference panning angular velocity and the detected angular velocity is larger than a predetermined value during exposure, the panning correction is temporarily stopped. By operating in this way, it is possible to easily take a beautiful panning shot, and conversely, if there is a possibility of increasing the shake, the panning shake correction is temporarily stopped. Can be prevented.
[Third Embodiment]
Hereinafter, an image blur correction operation according to the third embodiment of the present invention will be described with reference to the flowchart of FIG.

  The configuration of the camera system is the same as in FIG.

  In the present embodiment, the gain value of the panning correction during exposure is set depending on whether or not the difference between the reference panning angular velocity and the detected angular velocity is greater than a predetermined value at the exposure start timing. Accordingly, a setting unit for setting a gain value for panning correction is provided in the lens MPU 124 of the present embodiment.

  In FIG. 11, steps S1101 to S1108 and steps S1115 to S1118 are the same as those in the flowchart of FIG.

  In step S1109, it is determined whether the gain α for panning correction has been set. If it has been set, step S1112 follows. If it has not been set, step S1110 follows.

  In step S1110, it is determined whether the difference between the reference panning angular velocity W0 and the angular velocity sensor signal W is greater than a predetermined angular velocity WS (predetermined value). If it is larger than the predetermined value, the process proceeds to step S1114. If it is not larger than the predetermined value (if it is equal to or smaller than the predetermined value), the process proceeds to step S1111.

  In step S1111, since the reference panning angular velocity is accurately set, the panning correction gain α is set to 1.

  In step S1112, the difference between the reference panning angular velocity W0 and the angular velocity sensor signal W is integrated and angular displacement data is calculated. This result is the angular displacement data of the panning error. Then, the result is multiplied by a gain α to calculate the final angular displacement data of the panning error. If α = 1, the panning error is completely corrected. When α <1, the amount of correction of the panning error is reduced.

  In step S1113, the image stabilization sensitivity corresponding to the zoom position and the focus position is read, and the target drive amount of the shake correction lens 127 is calculated from the angular displacement data. The process advances to step S1115 to perform lens driving for panning correction.

  In step S1114, it is determined that there is a large error in the reference panning angular velocity, and the panning correction gain α is set to a value smaller than one. In other words, in the shake correction control unit 124a, the difference between the reference panning angular velocity W0 (first angular velocity) and the angular velocity sensor signal W (second angular velocity) is larger than the predetermined angular velocity WS (predetermined value) by the determination unit 124c. Is determined, the drive amount of the image blur correction lens 127 is reduced. More specifically, by integrating the difference between the first angular velocity and the second angular velocity, and applying a gain smaller than 1 to the result of the integral operation, the difference between the first angular velocity and the second angular velocity is calculated. The drive amount of the image blur correction lens 127 is set smaller than when the difference is equal to or smaller than a predetermined value. α is set by how much the difference between the reference panning angular velocity W0 and the angular velocity sensor signal W is larger than a predetermined angular velocity WS (predetermined value), that is, the magnitude of the error. The larger the error, the smaller the value of α. That is, the setting unit (not shown) in the lens MPU 124 sets the gain α to be smaller as the difference between the first angular velocity and the second angular velocity is larger than the predetermined value.

  As described above, it is determined whether the difference between the reference panning angular velocity and the detected angular velocity is greater than a predetermined value at the exposure start timing, and the panning correction amount is determined. Specifically, if the difference between the reference panning angular velocity and the detected angular velocity is equal to or smaller than a predetermined value, the panning correction is performed during exposure, and if it is larger than the predetermined value, it is determined that the error in the reference panning angular velocity is large. Reduce the amount of shake correction. By operating in this way, it is possible to easily shoot beautiful panning shots, and conversely, if there is a possibility of increasing shake, adverse effects can be obtained by reducing panning shake correction. Can be reduced.

  In the above-described embodiment, an example of a camera that observes a subject image in live view shooting has been shown. However, the same effect can be obtained if the vector information of the subject can be calculated by the photometric sensor arranged in the optical viewfinder. I can get it.

  According to the present invention, when the difference between the angular velocity detected from the angular velocity sensor 135 and the reference panning angular velocity calculated immediately before the start of exposure is equal to or less than a predetermined value, the calculated reference panning angular velocity is appropriate. to decide. During exposure, an accurate operation is performed by calculating a panning angular velocity error from the difference between the calculated reference panning angular velocity and the angular velocity detected by the angular velocity sensor 135, and correcting the calculated angular velocity error. It is possible to correct subject shake during panning.

  If the difference between the angular velocity detected from the angular velocity sensor 135 and the reference panning angular velocity calculated immediately before the start of exposure is greater than a predetermined value, it is determined that the calculated reference panning angular velocity is not appropriate. Then, during exposure, the image blur correction unit is operated so as to be held at a fixed position, and is operated so as not to perform the panning correction, so that it is possible to prevent the occurrence of subject blur.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist.

  For example, in the above embodiment, image blur correction is performed by driving the image blur correction lens 127, but image blur correction is performed by driving an image sensor (an optical element or an optical member) provided in the imaging unit 113. It is also possible to do this.

  In the above-described embodiment, the lens MPU 124 included in the interchangeable lens 112 calculates an ideal panning angular velocity, and whether or not the difference between the first angular velocity and the second angular velocity is greater than a predetermined value. Judging. Here, the calculation of the ideal panning angular velocity and the determination described above may be executed on the camera body 111 side. For example, an ideal panning angular velocity calculation and the above-described determination may be executed on the camera body 111 side, and the determination result may be transmitted to the interchangeable lens 112. Alternatively, the ideal panning angular velocity may be calculated on the camera body 111 side, the calculation result may be transmitted to the interchangeable lens 112, and the above determination may be performed on the interchangeable lens 112 side. As described above, by transmitting and receiving the ideal panning angular velocity calculation result and the above-described determination result between the lens MPU 124 and the camera MPU 114, appropriate panning shake correction can be performed.

  Also, for example, a software program that implements the functions of the above-described embodiments is supplied from a recording medium directly to a system or apparatus having a computer that can execute the program using wired / wireless communication, and the program is executed. This case is also included in the present invention.

  Accordingly, the program code itself supplied and installed in the computer in order to implement the functional processing of the present invention by the computer also realizes the present invention. That is, the present invention includes a computer program itself in which a procedure for realizing the functional processing of the present invention is described.

  In this case, the program may be in any form as long as it has a program function, such as an object code, a program executed by an interpreter, or script data supplied to the OS. The recording medium for supplying the program may be, for example, a magnetic recording medium such as a hard disk or a magnetic tape, an optical / magneto-optical storage medium, or a nonvolatile semiconductor memory.

  As a program supply method, a computer program that forms the present invention is stored in a server on a computer network, and a connected client computer downloads and programs the computer program.

  The present invention can be suitably used for an imaging apparatus such as a compact digital camera, a single-lens reflex camera, and a video camera.

124 Lens MPU
124a shake correction control unit 124b reference angular velocity calculation unit 124c determination unit

Claims (16)

  1. A shake correction control unit that performs shake correction control of the optical device by driving the shake correction element;
    Panning angular velocity for following the subject based on an output from a shake detection unit that detects a shake applied to the optical device and an output from a motion vector detection unit that detects a motion vector indicating the motion of the subject A control unit having a calculation unit for obtaining
    The shake correction control unit determines whether to drive the shake correction element according to a difference between the panning angular velocity and the angular velocity of the optical apparatus acquired based on the output of the shake detection unit. A control device characterized by that.
  2. A determination unit that determines whether a difference between the angular velocity of the panning shot and the angular velocity of the optical device is greater than a predetermined value;
    The control apparatus according to claim 1, wherein the shake correction control unit determines whether to drive the shake correction element according to the determination result.
  3.   The shake correction control unit stops driving the shake correction element when it is determined that the difference between the angular velocity of the panning shot and the angular velocity of the optical device is larger than the predetermined value. The control device described.
  4.   The control device according to claim 2, wherein the determination unit performs the determination at the start of exposure.
  5.   The control device according to claim 2, wherein the determination unit performs the determination from an exposure start to an exposure end.
  6.   When it is determined that the difference between the angular velocity of the panning shot and the angular velocity of the optical device is greater than the predetermined value between the start of exposure and the end of exposure, the shake correction control unit stops driving the optical element. The control device according to claim 5, wherein the optical element is held at the stopped position.
  7. A shake correction element;
    A drive unit that drives the shake correction element in a first direction and a second direction orthogonal to the first direction;
    The control device according to any one of claims 1 to 6,
    An optical apparatus comprising:
  8.   The optical apparatus according to claim 7, wherein the shake correction element is a lens.
  9.   The optical apparatus according to claim 7, wherein the shake correction element is an imaging element.
  10. A shake correction control unit that performs shake correction control of the optical device by driving the shake correction element;
    Panning angular velocity for following the subject based on an output from a shake detection unit that detects a shake applied to the optical device and an output from a motion vector detection unit that detects a motion vector indicating the motion of the subject A control unit having a calculation unit for obtaining
    The shake correction control unit changes a drivable range of the shake correction element according to a difference between the panning angular velocity and the angular velocity of the optical apparatus acquired based on the output of the shake detection unit. Control device characterized.
  11. A determination unit that determines whether a difference between the angular velocity of the panning shot and the angular velocity of the optical device is greater than a predetermined value;
    The control apparatus according to claim 10, wherein the shake correction control unit changes a drivable range of the shake correction element according to the determination result.
  12.   12. The shake correction control unit narrows a drive range of the shake correction element when it is determined that a difference between the angular velocity of the panning shot and the angular velocity of the optical device is larger than the predetermined value. The control device described in 1.
  13.   The control according to claim 12, wherein the shake correction control unit performs an integral operation on a difference between the panning angular velocity and an angular velocity of the optical device, and applies a gain smaller than 1 to the result of the integration operation. apparatus.
  14. A setting unit for setting the gain;
    The control device according to claim 13, wherein the setting unit sets the gain such that the gain decreases as the difference between the panning angular velocity and the angular velocity of the optical device increases.
  15. A lens device that is detachably attached to the imaging device and can communicate with the imaging device,
    A shake correction element;
    A shake detection unit for detecting shake applied to the lens device;
    A shake correction control unit that performs shake correction control by driving the shake correction element;
    The lens device receives information indicating a panning angular velocity for following the subject calculated based on an output from the shake detection unit and a motion vector indicating the motion of the subject from the imaging device,
    The shake correction control unit determines whether to drive the shake correction element according to a difference between the panning angular velocity and the angular velocity of the lens apparatus acquired based on the output of the shake detection unit. A lens device.
  16. A lens device that is detachably attached to the imaging device and can communicate with the imaging device,
    A shake correction element;
    A shake detection unit for detecting shake applied to the lens device;
    A shake correction control unit that performs shake correction control by driving the shake correction element;
    The lens device receives information indicating a panning angular velocity for following the subject calculated based on an output from the shake detection unit and a motion vector indicating the motion of the subject from the imaging device,
    The shake correction control unit changes the drivable range of the shake correction element in accordance with a difference between the panning angular velocity and the angular velocity of the lens device acquired based on the output of the shake detection unit. A lens device.
JP2015245297A 2015-01-16 2015-12-16 Control device, optical apparatus, and lens device Pending JP2016136242A (en)

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JP2015006934 2015-01-16

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14/994,420 US9900513B2 (en) 2015-01-16 2016-01-13 Control apparatus, optical apparatus, and lens apparatus

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JP2016136242A5 JP2016136242A5 (en) 2019-01-31

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