JP2010145500A - Optical equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem taht, when the correction of shaking is performed using an acceleration sensor, the correction of gravity acceleration and the setting of an initial velocity are required, and there is a need of performing the setting at high speed with high precision. <P>SOLUTION: The optical equipment comprises a displacement vector detection means, when the correction of shaking is performed on the basis of information from an acceleration sensor detecting acceleration, from the displacement of vibration by an imaging element or the like, for decomposing movement information to the detection direction of the acceleration sensor and detecting the same. From the output information from the displacement vector detection means, the reverse in a displacement direction is detected, on the basis of the information upon the detection of the reverse, the gravity acceleration and initial velocity in the acceleration sensor are set, the output from the acceleration sensor is corrected, and image shaking correction is started. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical apparatus having a function of improving image blur correction accuracy.

  Optical devices such as cameras and interchangeable lenses are often equipped with an image stabilization system that suppresses image blur due to camera shake.

  Camera shake is normally a vibration having a frequency of 1 Hz to 10 Hz. However, in an anti-shake system that can take a photograph with no image shake even when such a shake occurs at the time of exposure, the vibration of an optical device is detected. Depending on the detection result, the correction lens is displaced within the plane orthogonal to the optical axis (optical image stabilization), or the area to be cut out (output) of the captured image is shifted (electronic image stabilization).

  Here, vibrations such as camera shake are obtained by calculation processing based on the detection result by detecting acceleration, angular acceleration, angular velocity, angular displacement, and the like with a laser gyro or the like. Then, based on the calculated shake information, the image blur correction is performed by driving the correction lens or shifting the output area of the video.

  By the way, in general, when the shooting magnification is 0.1 times or less, the image shake correction is sufficient only by correcting the angular shake in the direction in which the imaging surface is inclined. However, when the shooting magnification is larger than that, The influence of parallel runout in the parallel direction becomes large. Further, as the photographing magnification increases, the influence of shake in the focus direction (photographing optical axis direction) also increases. This is because the parallel shake occurs as a shift on the image plane in proportion to the shooting magnification, and the shake in the focus direction occurs as a focus shift in proportion to the square of the shooting magnification.

  For this reason, conventionally, in an optical apparatus having a high photographing magnification such as a macro lens, a proposal has been made to correct parallel shake by using an acceleration sensor and controlling optical shake correction means.

  Further, the acceleration detected by the acceleration sensor is detected by adding the acceleration due to gravity to the acceleration of the parallel shake. In order to calculate the speed and displacement from the detected acceleration, it is necessary to accurately obtain the initial speed. As such means, Patent Document 1 discloses the following technique.

  First, the gravitational acceleration direction is continuously measured for a predetermined time, and the average gravitational acceleration direction is obtained from the average value of the measurement results. Thereafter, the displacement in the angular direction is obtained from the output of the angular velocity sensor, the displacement in the gravitational acceleration direction is calculated, and the shake acceleration is calculated by subtracting the gravitational acceleration from the detected acceleration.

  Further, Patent Document 1 discloses that the acceleration between the first peak time and the last peak time in a predetermined time interval among the accelerations detected by the acceleration sensor is used. A method is also disclosed in which the velocity is calculated from the acceleration by assuming that the deflection displacements are equal.

On the other hand, a method for directly obtaining shake displacement from the displacement of an image formed, for example, a method for detecting camera shake by detecting an image shake from an image signal detected by an AF sensor has been proposed. Discloses a method of setting an initial speed when obtaining a speed by integrating an output from an acceleration sensor from a speed calculated from a displacement and an acceleration, and excluding a difference in acceleration as a gravity component.
Japanese Patent Laid-Open No. 9-218435 JP 2006-003439 A

  When calculating the deflection displacement from the acceleration as in Patent Document 1, first, in order to calculate the gravitational acceleration direction, it is necessary to continuously measure the acceleration for a long time to obtain the gravitational direction. For this reason, it takes a long time to finally obtain the shake displacement, and the rapid photographing property of the photographing apparatus deteriorates.

  In addition, this method is established assuming that the shake applied to the camera is a periodic motion when calculating the initial velocity. However, since the camera shake that actually occurs behaves poorly in periodicity, the calculated initial speed includes a large error.

  On the other hand, as in Patent Document 2, the displacement of the camera shake is detected by the output from the photoelectric conversion element such as the AF sensor, and the initial speed and the gravitational acceleration information when calculating the displacement based on the output information of the acceleration sensor based on the displacement are obtained. Computation involves complicated calculations such as obtaining a difference after performing differential calculation, which causes a delay in correcting the actual displacement, and hinders improvement in shake correction accuracy. There is also a problem that if the shake correction time is a long time, the error from the initially set gravity acceleration information also increases.

  Therefore, the present invention also sequentially corrects the initial setting value of the acceleration sensor based on the displacement information of the image sensor and AF sensor output even in an optical apparatus that detects camera shake based on the acceleration sensor and performs shake correction. An object of the control for correction itself is to provide an optical apparatus capable of performing highly accurate image blur correction in a short time.

In order to achieve the above object, the present invention is an optical apparatus having a shake correction device that corrects image shake caused by vibration using shake correction means,
It has an acceleration sensor that detects the acceleration of the vibration, and a displacement vector detection means that detects the movement information from the vibration displacement and decomposes and detects the movement information in the detection direction of the acceleration sensor. The output of the displacement vector detection means Based on the information, the inversion of the displacement direction is detected, the output information of the acceleration sensor is corrected based on the information at the time of the inversion detection, and the image shake correction by the shake correction means is started based on the corrected acceleration.

  The displacement that is the basis of the output information of the displacement vector detection means can be configured without increasing new components by obtaining it from the signal of the image sensor constituting the optical device or the signal of the focus detection means. When detecting the reversal of displacement, the output information of the acceleration sensor at the time of detection is assumed to be gravitational acceleration, the output information of the acceleration sensor is corrected, and the initial speed is set with the speed at the time of detection set to 0 to obtain the displacement Thus, it is possible to detect high-precision camera shake in a short time.

  Further, every time the inversion is detected from the output information of the displacement vector detecting means, the accuracy of gravity can be further improved by resetting the gravitational acceleration and the initial speed.

  As described above, according to the present invention, the inversion of the direction is detected from the output of the displacement vector detection means for detecting the displacement in the same direction as the detection direction of the acceleration sensor for detecting the acceleration of the vibration, and the information of the acceleration sensor at the time of detection is detected. In addition to correcting the gravitational acceleration, the shake correction control is started by setting the initial speed for calculating the displacement calculated from the acceleration to 0, and resetting is performed each time a reverse is detected. And high-precision shake correction can be performed in a short time.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  Hereinafter, the present invention will be described in detail based on illustrated embodiments.

  FIG. 1 is a sectional view of an interchangeable lens camera representing an embodiment of the present invention. Here, the direction of the lens optical axis (photographing optical axis) AXL is defined as the Z direction, and the direction orthogonal to the lens optical axis AXL is parallel to the imaging surface. Let the direction be the Y direction.

  Reference numeral 1 denotes a camera body (hereinafter simply referred to as a camera), and 2 denotes an interchangeable lens attached to the camera 1. In the camera 1, 3 is a main mirror, which is arranged on the optical path of the light beam from the interchangeable lens 2 before the start of photographing, reflects a part of the light beam, guides it to the finder imaging means 4, and the remaining light beam Permeate. In this state, a sub mirror 5 is disposed behind the main mirror 3, and the light beam transmitted through the main mirror 3 is reflected and guided to the focus detection unit 6. The main mirror 3 and the sub mirror 5 are retracted from the optical path during photographing.

  The focus detection unit 6 includes a condenser lens that splits an incident light beam into two, two separator lenses that re-image each of the split light beams, and a sensor such as a CCD sensor that photoelectrically converts two imaged subject images. And a focus detection by the so-called phase difference detection method (detection of the focus state of the interchangeable lens 2). The sensor is arranged in a cross shape so as to detect the image position of the subject in the vertical direction (Y direction) and the horizontal direction (X direction). Reference numeral 7 denotes an image sensor composed of a CCD sensor or a CMOS sensor, and a light beam from the interchangeable lens 2 forms an image on a light receiving surface (imaging surface) of the image sensor 7. The imaging device 7 photoelectrically converts the formed subject image and outputs an imaging signal. An electronically controlled focal plane shutter 8 controls the exposure amount of the image sensor 7.

  The finder means 10 includes an image signal obtained by the finder image pickup device 4 and a display device 10a for displaying photographing information such as an in-focus position and an aperture value and a magnifying optical system 10b. A display means 21 is arranged on the back side separately from the finder means 10 and is used for image confirmation after imaging and various information displays.

  In the interchangeable lens 2, in order from the subject side, 11 is a first lens unit, 12 is a second lens unit as a focus lens, 13 is a third lens unit as a variable power lens, and 14 is a fourth lens as a shake correction lens. Is a unit. In addition, a diaphragm unit 15 is disposed between the third and fourth lens units 13 and 14, and adjusts the amount of light passing through the interchangeable lens 2 and reaching the camera 1 side. The lens units 11 to 14 and the aperture unit 15 constitute a photographing optical system.

  The second lens unit (focus lens) 12 receives the driving force from the AF motor 16 and moves on the optical axis AXL to adjust the focus. The third lens unit (magnification lens) 13 is operated by the photographer. When the force is transmitted by a transmission mechanism (not shown), the lens moves on the lens optical axis AXL and performs zooming.

  The fourth lens unit (shake correction lens) 14 receives the driving force from the shake correction device 19 and moves in a direction orthogonal to the lens optical axis AXL to perform image shake correction. Further, in a state in which no shake correction is performed, it is configured to be locked by a locking means (not shown).

  Specifically, shake information indicating the shake of the camera system is generated based on a signal from the acceleration sensor 18 provided on the interchangeable lens 2 side, in a direction opposite to the shake direction indicated by the shake information, and The shake correction device 19 is controlled so as to drive the fourth lens unit 14 by a drive amount (calculated from the shake displacement amount and the sensitivity of the shake correction lens) according to the shake displacement amount indicated by the shake information.

  The acceleration sensor 18 can detect the acceleration in the three directions X, Y, and Z described above. The drive control of the shake correction device 19 is performed by a lens CPU and a camera CPU, which will be described later.

  Reference numerals 17 and 20 denote mount parts on the interchangeable lens side and the camera side, respectively, which are mechanically connected to each other, and the camera and the lens are also electrically connected by a contact (not shown) so that they are integrated as one system. Controlled.

  FIG. 2 is a block diagram showing an electric circuit configuration of the interchangeable lens digital single-lens reflex camera system shown in FIG. In this figure, 100 is an electric circuit on the camera 1 side (hereinafter referred to as camera-side electric circuit), and 200 is an electric circuit on the interchangeable lens 2 side (hereinafter referred to as lens-side electric circuit).

  In the camera-side electric circuit, reference numeral 101 denotes a camera CPU constituted by a microcomputer, which controls the operation of each component on the camera 1 side and also has a camera contact 102 and an interchangeable lens 2 side (hereinafter simply referred to as the lens 2 side). Communication with the lens CPU 201 provided in the interchangeable lens 2 is performed via the lens contact 202. Further, it includes a power contact for supplying power to the lens 2 side.

  Reference numeral 103 denotes a power switch means that can be operated from the outside, and is a switch for starting up the camera CPU 101 to enable power supply to each actuator and sensor in the system and operation of the system. 104 is a two-stroke type release means operable from the outside, and has a first stroke switch (SW1) and a second stroke switch (SW2). A signal from the release unit 104 is input to the camera CPU 101 and enters a shooting preparation state in response to the input of the ON signal of the first stroke switch (SW1), and the subject brightness measurement by the photometry unit 105 and the focus detection unit 111 Focus detection by the phase difference detection method is started.

  The camera CPU 101 calculates the aperture value of the aperture unit 15, the exposure amount of the image sensor 7 (shutter time), and the like based on the result of the photometry unit 105. Further, based on the focus detection information (defocus amount and defocus direction) that is the detection result of the focus state, the drive amount and drive of the second lens unit 12 necessary for focusing on the subject to be imaged. The direction is determined, and information on the driving amount and the driving direction is sequentially transmitted to the lens CPU 201.

  Reference numeral 106 denotes a finder imaging unit, which outputs an image obtained by the finder imaging element 4 in FIG. Based on this information, the finder image is displayed at 110, and various information such as exposure information such as shutter speed and aperture value, and focus position information can also be displayed. Reference numeral 107 denotes a display device disposed on the back surface of the camera 1, and displays various information and captured images as in the case of 106. Further, in the present embodiment, the hand movement displacement is decomposed and detected in the X direction and the Y direction in FIG. 1, and the output of the acceleration sensor 210 is corrected based on the information. Details will be described later.

  Reference numeral 108 denotes an image pickup means, which means an image pickup device indicated by 7 in FIG. 1, converts an image that has passed through the optical system of the lens 2 into an image pickup signal, and transmits information to the camera CPU 101. An image recording unit 109 records the image signal obtained by the imaging unit 108 as image data on an external recording medium (not shown).

  The lens CPU 201 controls the operation of each component in the lens 2 and performs various controls based on information from the camera CPU. Reference numeral 203 denotes an IS switch means, which is a switch capable of switching ON / OFF of the operation of the shake correction apparatus 19 in FIG. 1. Specifically, when ON is selected, a correction optical system drive means 206 and The operation of the locking means 207 is permitted based on a signal from the lens CPU.

  Reference numeral 204 denotes AF / MF switch means for switching between auto focus and manual focus. Reference numeral 205 denotes IS control switching means for switching control of the shake correction apparatus. In this embodiment, the switch is operated as a switch that can select whether or not to perform focus blur correction in the Z direction.

  Reference numeral 206 denotes correction optical system driving means, which includes the shake correction device 19 shown in FIG. 1 and its drive circuit. The shake correction device 19 includes an X-direction drive unit including a permanent magnet and a coil that drives the fourth lens unit 14 in the X direction, and a Y-direction drive unit including a permanent magnet and a coil that drives the fourth lens unit 14 in the Y direction. It consists of. In the lens 2, there is provided a locking means 207 for holding the fourth lens unit 14 at a position where its optical axis substantially coincides with the lens optical axis AXL. In response to a command signal from the lens CPU 201, the correction optical system driving unit 206 locks the locking unit 207 when the IS switch 203 is turned off (when shake correction is stopped), and the IS switch 203 is turned on. When this occurs (during shake correction operation), the locking means 207 is unlocked.

  Reference numeral 209 denotes AF driving means, which performs autofocus driving of the second lens unit 12 by driving the AF motor 16 in accordance with the driving amount and driving direction information of the second lens unit 12 transmitted from the camera CPU 101. The AF driving unit 209 calculates the focus shake correction amount by the lens CPU 201 and the camera CPU 101 and starts the focus shake correction drive amount simultaneously with the start of the exposure operation when the photographing magnification is higher than the predetermined value during shake correction control. The AF motor 16 is driven according to the direction information. Details will be described later.

  Reference numeral 208 denotes electromagnetic diaphragm means, which is controlled by the lens CPU 201 that has received an aperture driving command from the camera CPU 101, and operates the aperture unit 15 shown in FIG. 1 to an aperture state corresponding to the aperture value specified by the command.

  210 is an acceleration sensor denoted by reference numeral 18 in FIG. 1, and detects acceleration in three directions of X, Y, and Z orthogonal to each other mechanically, specifically using inertial force generated by vibration, A signal indicating the acceleration is output to the lens CPU 201.

  Next, the shake correction control in this embodiment will be described in detail.

  First, when the lens CPU 201 and the camera CPU 101 receive the ON signal from the IS (anti-vibration) switch 203 provided on the lens 2 side and the ON signal of the first stroke switch (SW1) in the release means 104, the finder imaging means 106 is obtained. The image signal obtained by the above is displayed on the finder image display unit 110, and the shake displacement vector obtained from the image signal is separated into the X and Y directions in FIG. 1 to detect the direction of each vector. Note that a method for detecting a motion vector from an image signal is well known in Japanese Patent No. 2941815 and the like and will not be described.

  Then, the driving of the correction optical drive means of the shake correction device 19 is started only in the detection direction from the time when the direction inversion is detected. At that time, the shake correction information is controlled based on the displacement obtained by integrating the output from the acceleration sensor, but the gravitational acceleration in the detection direction at the start of the shake correction operation is stored as the gravitational acceleration at the time of inversion detection, Control is started based on the difference acceleration information. That is, since the camera shake acceleration in the direction of reverse detection is almost zero at the time of reverse detection, the acceleration information detected at that time is gravitational acceleration. Therefore, if control is started from that time, the change in acceleration due to camera shake can be obtained as a difference value from the acceleration at the time of inversion detection. At the time of reversal, there is no hand shake displacement change, so the speed is zero. Therefore, if the control is started from the time point when the reversal is detected, it is not necessary to assume the initial velocity in the detection direction when the displacement is obtained by the acceleration sensor, and the control can be started easily.

  On the other hand, the so-called focus blur in the Z direction in FIG. 1 is controlled based on the displacement obtained by integrating the output from the acceleration sensor as in the X and Y directions. In the present embodiment, it is based on information from the focus detection unit 111. Specifically, the direction of focus change is detected, and shake correction in the Z direction is started when reversal is detected. The gravitational acceleration in the Z direction at that time is the value of the acceleration sensor at the time when the reversal of the focus change direction is detected, and the initial speed that is the basis of the displacement calculated based on the output from the acceleration sensor at that time is 0 As in the X and Y directions, shake correction control can be easily performed.

  The inversion detection in the X, Y, and Z directions described above is repeated until the start of the exposure operation on the camera 1 side, the acceleration correction value is updated and stored as needed, the initial speed is recalculated as 0, and the shake on the image plane is detected. The displacement is obtained, and the driving amount and direction of the fourth lens unit 14 are determined. Further, the camera shake correction in the Z direction may not be necessary depending on the image magnification and the subject, so the photographer can select whether or not to perform control by the IS control switching unit 205.

  When an ON signal is input from the second stroke switch (SW2), the camera CPU 101 transmits an aperture drive command to the lens CPU 201, and causes the aperture unit 15 to set the previously calculated aperture value. In addition, the camera CPU 101 transmits an exposure start command to the imaging unit 108 to perform the retracting (up) operation of the mirrors 3 and 5 and the opening operation of the shutter 8, and the subject image is captured by the imaging unit 108 including the imaging element 7. Photoelectric conversion, that is, photographing is performed.

  An image pickup signal from the image pickup means 108 (image pickup element 7) is digitally converted in the camera CPU 101, further subjected to various correction processes, and output as an image signal. The image signal (data) is recorded and stored in a recording medium such as a semiconductor memory such as a flash memory, a magnetic disk, and an optical disk in the image recording unit 109.

  Next, the contents related to the inversion detection of the displacement vector will be described with reference to FIG.

  The displacement indicated by a circle in the square in FIG. 3 represents the displaced position per unit time, and within a certain time after receiving the ON signal of the first stroke switch (SW1) of the release means 104. It shows the change of the displacement vector detected by the finder image display unit. And the graph which each decomposed | disassembled into the X direction and the Y direction, and was represented as a displacement for every predetermined time is each represented below and the side.

  Now, when looking at the X direction, since the first inversion of the vector was detected at a, the output information of the acceleration sensor in the X direction at the time of a is stored as the gravitational acceleration in the X direction. Calculate as acceleration. Further, the initial speed when the displacement is obtained from the acceleration information of the acceleration sensor is calculated as 0 to obtain the displacement. Also, since the inversion is detected at b, the reset operation performed at a is performed so that the deviation of the shake information does not become large.

  Similarly, since inversion is detected at time point c in the Y direction, output information from the acceleration sensor in the Y direction at time point c is stored as gravity acceleration in the Y direction, and thereafter, the acceleration of this difference is calculated as camera shake acceleration. . Further, the initial speed when the displacement is obtained from the acceleration information of the acceleration sensor is calculated as 0 to obtain the displacement. Also in the Y direction, since inversion is detected at d and e thereafter, the reset is performed at this time as in the case of X. As described above, since the displacement due to the normal camera shake always involves reversal when viewed as a displacement disassembled in a certain direction, the image stabilization operation is started before detecting the ON signal from the second stroke switch (SW2) of the release means 104. be able to. However, if no reversal is detected, it is apparently abnormal or panning, so there is no problem even if the anti-vibration operation in that direction is not started.

  Next, the main operation of this embodiment will be described with reference to the flowchart of FIG.

  First, when the power switch 103 in the camera-side electrical circuit 100 is turned on, power supply to the lens-side electrical circuit 200 is started, and communication between the camera CPU 101 and the lens CPU 201 is started (step <hereinafter referred to as S). > 01).

  Next, the camera CPU 101 determines whether or not an ON signal of the first stroke switch (SW1) in the release means 104 is generated (S02). When the ON signal is generated, the lens CPU 201 It is determined whether the switch means 203 is ON (S03). When the IS switch means 203 is ON, the process proceeds to S04, and when it is not ON, the process proceeds to S17.

  In S04, the camera CPU 101 performs photometry and focus detection operation, and the lens CPU 201 performs focus operation based on the focus detection result and starts acceleration detection by the acceleration sensor 210.

  In S05, when the lens CPU 201 detects the selection status of the IS control switching unit 205 and the mode for performing the focus shake correction (correction in the Z direction) is selected, the process proceeds to S06, and the mode in which the focus shake correction is not performed is selected. If yes, go to S12.

  In S06, detection of displacement vectors in the X direction and Y direction based on information from the finder imaging means 106 is started, and detection of displacement vectors in the Z direction is started by the camera CPU 101 based on information from the focus detection unit 111, respectively. . Information from the acceleration sensor 210 is also detected by the lens CPU.

  In S07, when inversion is detected from the result of the displacement vector in each direction started in S06, the lens CPU 201 and the camera CPU 101 start shake correction control in the detection direction. Specifically, as described above, the acceleration sensor value in the detection direction at the time of inversion detection is used as a gravitational acceleration component, and the subsequent acceleration information is output as a difference from this value, and the initial speed at the time of inversion detection is set to 0 and the acceleration sensor In the X and Y directions, the fourth lens unit 14 is subjected to shake correction control via the correction optical driving means 206 so as to correct the displacement calculated on the basis of the information from, and the AF driving means 209 is controlled in the Z direction. The focus shake correction control of the second lens unit 12 is performed. After the shake correction control is started, the gravity acceleration and initial velocity values are reset and the control is continued in the same manner every time reversal is detected.

  This operation in S08 is repeated until the second stroke switch (SW2) of the release means 104 is turned on in the next S09, and is updated to the latest correction value.

  In S09, it is determined whether or not an ON signal is input from the second stroke switch (SW2) of the release means 104, and S02 to S08 are repeated until an ON signal is input. When the ON signal from SW2 is input, the process proceeds to S10.

  In S <b> 10, the camera CPU 101 starts the exposure operation of the imaging unit 108. Note that the lens CPU 201 performs shake correction and focus shake correction in the X, Y, and Z directions even during exposure. When the exposure is thus completed, the process proceeds to S11, where the camera CPU 101 records the captured image data on the recording medium, and returns to S02.

  If the mode in which the IS control switching unit 205 does not perform focus shake correction is selected in S05, the process proceeds to S12, and the acceleration sensor other than the Z direction is detected and the viewfinder image capturing unit 106 is in the same manner as S06. The detection of the displacement vector based on the information is started.

  In S13 and S14, as in S07 and S08, inversion of displacement vectors in the X direction and Y direction is detected, and shake correction control is started. The details are the same as S07 and S08, and will be omitted.

  In S15, it is determined whether or not an ON signal is input from the second stroke switch (SW2) of the release means 104, and S02 to S14 are repeated until the ON signal is input. When the ON signal from SW2 is input, the process proceeds to S16, the exposure operation is performed as in S10, and the process proceeds to S11.

  If the IS switch means 203 is OFF in S03, the camera CPU 101 performs focus detection and photometry operation in S17. Then, the process proceeds to S18, and S02 to S17 are repeated until the ON signal from SW2 is input by the second stroke operation of the release means 104. When the ON signal from SW2 is input, the process proceeds to the exposure operation in S19. In this case, no shake correction is performed.

  The camera CPU 101 and the lens CPU 201 repeat the above series of operations until the power switch 103 is turned off. When the power switch 103 is turned off, the communication between the camera CPU 101 and the lens CPU 201 is terminated, and the lens-side electric circuit 200 is connected. Power supply is also terminated.

  With the above configuration, shake correction control using an acceleration sensor is performed at high speed and with high accuracy in shake correction of parallel shake in a direction parallel to the imaging surface at the time of so-called macro shooting, which generally has a shooting magnification of 0.1 times or more. Can do.

  In this embodiment, the case where parallel shake in the X direction and the Y direction is detected using the output from the finder imaging unit has been described. However, the present invention is not limited to this, and for example, the output from the imaging unit 108 These may be detected using.

  In this embodiment, the case where the correction of the parallel shake and the focus shake is started before the start of the exposure has been described. However, the correction of the parallel shake and the focus shake may be started after the start of the exposure.

  Further, although the present embodiment has been described with respect to a lens interchangeable digital single-lens reflex camera, the present invention can also be applied to a digital camera on a lens-integrated side, and further to a video camera.

  Further, the fourth lens unit 14 may be configured to rotate about one point on the optical axis and move substantially in a direction perpendicular to the optical axis, or a so-called variable apex angle prism.

It is sectional drawing which shows the lens interchangeable single-lens reflex camera of this embodiment. It is a block diagram showing the electric circuit structure of the camera system of this embodiment. It is a time chart figure of displacement vector detection of this embodiment. 6 is a flowchart showing main operations of the camera system of the present embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,100 Camera 2,200 Lens 3 Main mirror 4 Viewfinder image sensor 6 Focus detection part 7 Image sensor 18 Accelerometer

Claims (6)

An optical apparatus having a shake correction device that corrects image shake caused by vibration using shake correction means,
An acceleration sensor for detecting acceleration of the vibration; and displacement vector detection means for detecting movement information from the vibration displacement and decomposing the movement information in the detection direction of the acceleration sensor. Control means for detecting inversion of the displacement direction from the output information, correcting the output information of the acceleration sensor based on the information at the time of the inversion detection, and starting image blur correction by the shake correction means based on the corrected acceleration An optical apparatus comprising:   2. The optical apparatus according to claim 1, wherein the displacement based on the output information of the displacement vector detection means is obtained from a signal of an image sensor constituting the optical apparatus or a signal of a focus detection means.   The control means corrects the output information of the acceleration sensor using the output information of the acceleration sensor at the time of detection as gravity acceleration information when detecting the inversion of the displacement from the output information of the displacement vector detection means. The optical apparatus according to claim 1 or 2.   When the control means detects the inversion of the displacement from the output information of the displacement vector detection means, the initial speed is set by setting the shake speed in the displacement direction at the time of detection to 0, and the shake based on the output information from the acceleration sensor The optical apparatus according to claim 1, wherein a displacement is obtained.   5. The detection direction of the acceleration sensor is three directions, two directions parallel to the image plane and the optical axis direction, and the detection direction of the displacement vector detection means is also the same direction. The optical apparatus in any one of.   6. The optical apparatus according to claim 1, wherein the gravity acceleration information and the initial speed resetting operation are performed every time inversion is detected from the output information of the displacement vector detection means.

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