JP2006145768A - Image shake correcting device and image shake correcting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera shake correcting device having simple structure, good in controllability and realizing rapid photographing preparation operation, and to provide a camera shake correcting method. <P>SOLUTION: Relative shake between a subject and a digital single lens reflex camera 10 is detected by angular velocity sensors 25a, 25b and 25c in a camera body 11 through a lens frame module 12. The shake correction of an imaging system is performed by an imaging part position driving unit 23 based on signals from the angular velocity sensors 25a and 25b. The shake correction is individually performed in photographing preparation operation and in photographing operation, respectively. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an imaging apparatus, and more particularly to an image shake correction apparatus mounted on the imaging apparatus and a correction method thereof.

  As an image blur (camera shake) correction device in an imaging device, information on the oscillation of the imaging device is detected using an angular velocity sensor, and the optical axis is moved by moving a part of the optical system based on the information. A device that performs shift and image blur correction is known.

  For example, a camera that performs optical shake correction on a captured image is known as one that performs such image shake correction (see, for example, Patent Document 1).

  Further, a technique of a camera that performs rolling correction using an image rotator is known (see, for example, Patent Document 2).

  Further, a video camera having a configuration including an XY drive unit that moves the image sensor in the horizontal direction and the vertical direction and a rotation drive unit that rotates the image sensor in a direction rotating with respect to the optical axis is known. (For example, refer to Patent Document 3).

A technique related to a photographing apparatus capable of switching between a mode that follows panning or tilting and a mode that does not follow panning or tilting is known (see, for example, Patent Document 4).
Japanese Patent No. 3206075 Japanese Patent Laid-Open No. 9-166805 JP-A-9-261524 Japanese Examined Patent Publication No. 6-28409

  In the camera disclosed in Patent Document 1 described above, camera shake correction is performed on a captured image, but there is no suggestion regarding a method for performing shake correction in the finder, and an environment in which camera shake is likely to occur is not disclosed. However, it is not suitable for aiming for a photo opportunity by paying attention to the expression and movement of the subject.

  In addition, the camera described in Patent Document 2 has a problem that inertia force becomes large to drive a large prism and it is difficult to cope with a steep shake.

On the other hand, Patent Document 3 discloses a technique related to a video camera that corrects yawing, pitching, and rolling by physically moving a CCD (Charge Coupled Device). In a digital still camera, it is necessary to perform preliminary operations such as strobe charge and shutter charge during photographing preparation operations such as framing and AF (Auto Focus), and the power consumption in this state should be reduced. Is known to be very important for extending battery life.
Therefore, in the case of a digital still camera, even with a model using EVF (Electronic View Finder), the video camera disclosed in Patent Document 3 described above is used for live view that is moving image processing. As described above, it is not practical to perform a correction operation for moving the CCD using three actuators.

Considering the technique disclosed in Patent Document 4, for example, when performing panning in still photography, generally performing an AF operation in advance and locking the focus and waiting for a photo opportunity is generally performed. Is called. However, when a mode that does not follow panning or tilting is selected by the technique of Patent Document 4, sufficient camera shake correction effect cannot be obtained during AF, and AF becomes difficult particularly when a telephoto lens is used. There was a problem.
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described conventional problems, and an object thereof is to provide a camera shake correction apparatus and a correction method thereof that allow a quick photographing preparation operation with a simple structure and good controllability.

  That is, the invention described in claim 1 is an image shake correction method for performing shake correction in accordance with the relative shake between the subject and the image pickup apparatus, which is performed at each of the shooting preparation operation and the shooting operation. However, it is characterized in that each individual correction is performed.

  According to a second aspect of the present invention, in the first aspect of the invention, the relative shake between the subject and the imaging device is a translational vibration in a plurality of coordinate axis directions and a rotation around each coordinate axis. The first correction that is performed at the time of imaging preparation includes at least one of the vibrations, and the second correction that is performed at the time of imaging is characterized in that at least a part of a target vibration degree of freedom is different.

  The invention according to claim 3 is the invention according to claim 2, wherein at least a part of the vibration targeted for the first correction is included in the vibration targeted for the second correction. It is characterized by.

  The invention according to claim 4 is the invention according to claim 3, wherein at least a part of the vibrations targeted for the second correction is included in the vibrations targeted for the first correction. It is characterized by not.

  According to a fifth aspect of the present invention, in the fourth aspect of the invention, the vibration that is included in the vibration that is the object of the second correction and that is not included in the vibration that is the object of the first correction. Rotational vibration around the optical axis of the photographic lens.

  The invention according to claim 6 is the invention according to claim 2, wherein at least a part of the vibration targeted for the second correction is included in the vibration targeted for the first correction. It is characterized by.

  The invention described in claim 7 is the invention described in claim 6, wherein at least a part of the vibration targeted for the first correction is included in the vibration targeted for the second correction. It is characterized by not.

  The invention according to claim 8 is the invention according to claim 7, wherein the vibration that is included in the vibration targeted for the first correction and that is not included in the vibration targeted for the second correction is , At least one of rotational vibrations around the axis other than the optical axis of the photographing lens.

  The invention according to claim 9 is the invention according to claim 7, wherein the vibration that is included in the vibration targeted for the first correction and that is not included in the vibration targeted for the second correction is And at least one of a plurality of axial translational vibrations.

  The invention described in claim 10 includes image shake correction means for performing shake correction corresponding to the relative shake between the subject and the imaging device. In each of the shooting preparation operation and the shooting operation, It is characterized by performing individual correction.

  According to an eleventh aspect of the present invention, in the tenth aspect of the present invention, the correction means includes a first correction means that performs correction during the shooting preparation and a second correction means that performs correction during the imaging. The relative shake between the subject and the imaging device includes at least a part of a translational vibration in a plurality of coordinate axis directions and a rotational vibration around each coordinate axis, and the first correction means And the second correction means are characterized in that at least a part of the vibration degrees of interest is different.

  The invention described in claim 12 is the invention described in claim 11, wherein at least part of the vibration targeted by the first correction means is included in the vibration targeted by the second correction means. It is characterized by that.

  According to a thirteenth aspect of the present invention, in the twelfth aspect of the present invention, at least a part of the vibrations targeted by the second correction means is vibrations targeted by the first correction means. It is not included in.

  The invention described in claim 14 is the invention described in claim 13, which is included in the vibration targeted by the second correction means, and is not included in the vibration targeted by the first correction means. The vibration is a rotational vibration around the optical axis of the photographing lens.

  According to a fifteenth aspect of the invention, in the eleventh aspect of the invention, at least a part of the vibration targeted by the second correction means is included in the vibration targeted by the first correction means. It is characterized by that.

  According to a sixteenth aspect of the present invention, in the fifteenth aspect of the present invention, at least a part of the vibrations targeted by the first correction means is the vibrations targeted by the second correction means. It is not included.

  According to a seventeenth aspect of the present invention, in the sixteenth aspect of the present invention, the vibration that is included in the vibration targeted by the first correction unit and that is not the target of the second correction unit is a photographic lens. Rotational vibration around an axis orthogonal to each of the optical axes.

  According to an eighteenth aspect of the present invention, in the sixteenth aspect of the present invention, the vibration that is included in the vibration that is the target of the first correction unit and is not the target of the second correction unit is the photographic lens. The translational vibrations are orthogonal to the optical axis of each.

  According to a nineteenth aspect of the present invention, in the invention according to any one of the tenth to eighteenth aspects, the optical system related to the imaging device includes a movable mirror that selectively switches an optical path, and the movable mirror Of the plurality of optical paths switched by the above, the first correction means and the second correction means are arranged in different optical paths.

  The invention according to claim 20 is an image shake correction method for detecting a signal corresponding to a relative shake between a subject and an imaging apparatus and performing a shake correction based on the detected signal. The image processing apparatus includes a first correction process for correcting image blur during a shooting preparation operation of the imaging apparatus, and a second correction process for correcting image blur during a shooting operation following the shooting preparation operation. .

  According to a twenty-first aspect of the present invention, in the invention of the twentieth aspect, relative shake between the subject and the imaging device is a first direction, an optical axis direction, and the optical axis. A translational vibration in a second direction orthogonal to the direction, a third direction orthogonal to the first and second directions, and a rotational vibration around each axis in the first, second, and third directions. At least one of them is included, and the first correction step and the second correction step are characterized in that at least a part of the degree of freedom of vibration to be corrected is different.

  The invention according to claim 22 is the invention according to claim 21, wherein at least a part of the vibration targeted for correction by the first correction step is subject to correction by the second correction step. It is included in the vibration which exists.

  According to a twenty-third aspect of the present invention, in the invention of the twenty-second aspect, at least a part of vibrations to be corrected by the second correction step is corrected by the first correction step. It is different from the target vibration.

  The invention according to claim 24 is the vibration according to claim 23, which is included in the vibration targeted for the correction of the second correction step, and the vibration targeted for the correction of the first correction step. The vibration different from that is a rotational vibration around the optical axis of the photographing lens.

  The invention according to claim 25 is the invention according to claim 21, wherein at least a part of vibration targeted for correction in the second correction step is targeted for correction in the first correction step. It is included in the vibration which exists.

  According to a twenty-sixth aspect of the invention, in the invention of the twenty-fifth aspect, at least a part of the vibration targeted for the correction of the first correction step is the correction of the second correction step. It is characterized by the fact that it is different from the vibration.

  A twenty-seventh aspect of the present invention is the vibration according to the twenty-sixth aspect of the present invention, which is included in the vibration targeted for the correction in the first correction step, and the vibration targeted for the correction in the second correction step. The vibration different from the above is at least one of rotational vibrations around the axes in the second and third directions.

  A twenty-eighth aspect of the present invention is the vibration according to the twenty-sixth aspect of the present invention, which is included in the vibration targeted for the correction of the first correction step and the vibration targeted for the correction of the second correction step. The vibration different from the above is characterized in that it is at least one of a plurality of axial translational vibrations.

  According to a twenty-ninth aspect of the present invention, there is provided a shake detecting means for detecting a relative shake between a subject and an imaging device, and an image shake is corrected based on a signal from the shake detecting means. A first correction unit that performs correction during the shooting preparation operation, and an image shake correction based on a signal from the shake detection unit, and the first correction unit during the shooting operation that follows the shooting preparation operation. And second correction means for performing different corrections.

  According to a thirty-third aspect of the present invention, in the invention of the twenty-ninth aspect, the relative shake between the subject and the imaging device is an optical axis direction that is a first direction, and the optical axis. A translational vibration in a second direction orthogonal to the direction, a third direction orthogonal to the first and second directions, and a rotational vibration around each axis in the first, second, and third directions. The first correction unit and the second correction unit include at least a part of them, and are characterized in that at least a part of the degree of vibration freedom to be processed is different.

  The invention described in claim 31 is the invention described in claim 29, wherein at least part of the vibration targeted by the first correction means is included in the vibration targeted by the second correction means. It is characterized by that.

  According to a thirty-second aspect of the present invention, in the thirty-first aspect, at least a part of the vibrations targeted by the second correction means is vibrations targeted by the first correction means. It is characterized by being different.

  A thirty-third aspect of the invention is the vibration according to the thirty-second aspect, wherein the vibration is included in the vibration targeted by the second correction means and is different from the vibration targeted by the first correction means. Is a rotational vibration around the optical axis of the photographic lens.

  According to a thirty-fourth aspect of the present invention, in the thirty-third aspect, at least a part of the vibration targeted by the second correction means is included in the vibration targeted by the first correction means. It is characterized by that.

  According to a thirty-fifth aspect of the present invention, in the thirty-fourth aspect, at least a part of the vibrations targeted by the first correction means is the vibrations targeted by the second correction means. Are different.

  A thirty-sixth aspect of the invention is the invention according to the thirty-fifth aspect of the invention, wherein the first correction means includes a vibration that is a target, and the second correction means does not target a vibration. Rotational vibration around the axes in the second and third directions.

  The invention described in claim 37 is the invention described in claim 35, wherein the vibration not included in the second correction means is included in the vibration targeted by the first correction means. Translational vibrations in the second and third directions.

  According to a thirty-eighth aspect of the invention, in the invention according to any one of the thirty-ninth to thirty-seventh aspects, the optical system related to the imaging device includes a movable mirror that selectively switches an optical path, and the movable mirror Of the plurality of optical paths switched by the above, the first correction means and the second correction means are arranged in different optical paths.

  According to the present invention, it is possible to provide a camera shake correction apparatus and a correction method thereof that have a simple structure, good controllability, and enable a quick photographing preparation operation.

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

(First embodiment)
FIG. 1 is a perspective view schematically showing a part of the external configuration of a digital camera according to the first embodiment of the present invention.

  In FIG. 1, the digital camera 10 includes a camera body 11 and a lens frame module 12.

  The lens frame module 12 is mounted on the front surface of the camera body 11, and includes a first group lens 14 to a fourth group lens 17 having a zoom function, which will be described later, and the like. The lens frame module 12 is for guiding a photographic light beam from a subject (not shown) to a CCD 22 which is an imaging device.

  A shutter button 21 corresponding to a shutter release switch is provided on the upper surface of the camera body 11.

  A CCD 22 is arranged inside the camera body 11 on the extension of the optical axis of each lens of the lens barrel module 12. Therefore, the subject image transmitted through the lens frame module 12 is formed on the CCD 22.

  The optical axis from the lens frame module 12 toward the center of the imaging surface of the CCD 22 corresponds to the Y axis shown in FIG. 1, passes through the intersection of this optical axis center and the CCD 22, and extends in the vertical direction to the Z axis. The X axis is determined in a direction that passes through the intersection of the optical axis center and the CCD 22 and is perpendicular to the Y axis and the Z axis.

  Further, in the camera body 11, an imaging unit position driving unit 23 for controlling the position of the CCD 22 in the X-axis direction and the Y-direction, and an angular velocity that is a detection means for detecting image shake occurring in the camera body 11. Sensors 25a, 25b, and 25c, and an optical finder unit 27 that is used for checking a subject during framing are arranged. Further, a liquid crystal monitor 28 is provided on the back surface of the camera body 11.

  The details of the optical finder unit 27 will be described later.

  FIG. 2 is a block diagram showing a schematic configuration of the camera of FIG.

  In FIG. 2, the above-described lens frame module 12 includes a first group lens 14, a second group lens 15, a third group lens 16, a fourth group lens 17, and a diaphragm 18. A shutter 20 is provided in the camera body 11 behind the lens frame module 12. The light beam that has passed through the first group lens 14 and the second group lens 15 passes through the diaphragm 18, then passes through the third group lens 16 and the fourth group lens 17, passes through the shutter 20, and is guided to the CCD 22 that is an imaging unit.

  The CCD 22 is fixed to an image pickup unit position driving unit 23 which is a first correction unit. In response to an instruction from the controller 30, the imaging unit position control unit 37 controls the imaging unit position drive unit 23 to perform position control in the X direction and the Z direction shown in FIG.

  The controller 30 controls the overall control operation of the camera. The controller 30 includes the angular velocity sensors 25a, 25b and 25c, the zoom control unit A31, the zoom control unit B32, the aperture control unit 33, the focus control unit 34, the shutter control unit 36, and the imaging position control unit. 37, a memory 39, an observation unit position control unit 40, a control circuit 50, a signal processing unit 52, a memory 58, and an I / F (Interface) unit 61 via an external personal computer (PC). 62 is connected.

  The zoom control unit A31 controls the second group lens 15 based on an instruction from the controller 30, and the zoom control unit B32 controls the third group lens 16 and the fourth group lens 17 based on an instruction from the controller 30. It is something to control. The angle of view is adjusted by these controls.

  The aperture control unit 33 controls the aperture 18 based on an instruction from the controller 30. The focus control unit 34 drives the fourth group lens 17 based on an instruction from the controller 30 to perform focus adjustment.

  The shutter controller 36 controls the timing of the shutter 20 based on an instruction from the controller 30. The imaging unit position control unit 37 shifts the position control of the CCD 22 based on an instruction from the controller 30 as described above. This shift amount is controlled based on output signals from the angular velocity sensors 25a, 25b, and 25c, focal length, distance information to the subject, and the like. The movement target position is calculated from the current position of the CCD 22, and the movement target is calculated. After determining whether the position is within the movable area of the CCD 22 or outside the movable area, each control is performed.

  Specifically, when the movement target position is within the movable region, the CCD 22 determines the upper limit of the current supplied to the voice coil motors (VCM) 70 and 76, which will be described later, depending on the capability of the power supply unit (not shown). It is moved toward the movement target position by the normal driving with the determined current amount I.

  On the other hand, when the movement target position is outside the movable region, the CCD 22 moves toward the movement target position by low thrust driving in which the upper limit of the current supplied to the VCMs 70 and 76 is limited to I ′ (= I / 2). Is done.

  In the memory 39, a control program for controlling the entire digital camera is stored in advance in its internal ROM. The memory 39 also includes a RAM, which is used as a working storage area when the controller 30 executes the control program.

  The observation unit position control unit 40 is for adjusting the position of the objective lens 41 of the optical finder unit 27, which will be described in detail later.

  The control circuit 50 is for controlling the CCD 22 and the imaging processing unit 51 according to instructions from the controller 33. Although not shown, the imaging processing unit 51 includes a CDS (Correlated Double Sampling), an AGC (Automatic Gain Control), an ADC (Analog to Digital Converter), and the like. Consists of. In the imaging processing unit 51, predetermined processing is performed on the analog signal output from the CCD 22, and the processed analog signal is converted into a digital signal.

  The signal processing unit 52 performs processing such as white balance and γ correction on the captured image data output from the imaging processing unit 51 and the image data output from the compression / decompression processing unit 53. The signal processing unit 52 also includes an AE (Automatic Exposure) detection circuit and an AF detection circuit.

  The compression / decompression processing unit 53 performs compression processing and decompression processing of image data, and performs compression processing on the image data output from the signal processing unit 52 and expansion processing on the image data output from the card I / F 54. Do. For example, a JPEG (Joint Photographic Experts Group) system is used for compression processing and decompression processing of image data.

  The card I / F 54 is for transmitting and receiving data between the digital camera 10 and the memory card 55, and performs processing for writing and reading image data. The memory card 55 is a semiconductor recording medium for recording data, and is detachable from the digital single lens reflex camera 10.

  A digital signal (image data) output from the signal processing unit 52 is recorded in the memory 58, and a digital signal output from the signal processing unit 52 is received in a DAC (Digital to Analog converter) 59. Convert to analog signal.

  The liquid crystal display monitor 28 performs image display based on the analog signal output from the DAC 59. As described above, the liquid crystal display monitor 28 is provided on the back side of the camera body 11, and the photographer can take a picture while looking at the liquid crystal display monitor 28.

  The interface (I / F) unit 61 is for transmitting and receiving data between the controller 30 and the personal computer (PC) 62, and uses, for example, an interface circuit for USB (Universal Serial Bus (registered trademark)). It is done.

  The personal computer 62 is used for writing the focus sensitivity correction data of the CCD 22 to the memory 39 in the manufacturing stage of the digital camera, and does not constitute the digital camera 10.

  FIG. 3 is a perspective view showing the configuration of the imaging unit position driving unit 23 described above.

  In FIG. 3, a Z slider 69 guided by a shaft 66 and a shaft 67 is supported on a base 65 so as to be slidable in the Z-axis direction shown in FIG. 1, and a VCM (Voice Coil Motor) 70 is supported. It can be driven by the thrust generated.

  On the Z slider 69, a shaft 72 and an X slider 75 guided by the shaft 73 are supported so as to be slidable in the X-axis direction, and can be driven by the thrust generated by the VCM 76. .

  The CCD 22 is placed on the X slider 75, and the CCD 22 can move in two directions, the X-axis direction and the Z-axis direction. A rotor 78 on which the CCD 22 is placed is supported on the X slider 75 so as to be rotatable about a substantially central portion of the CCD 22. The rotation of the motor 81 similarly disposed on the X slider 78 is transmitted to the rotor 78 by the worm gear 80 and the gear 79 formed on the side surface of the rotor 78. Thus, the CCD 22 is configured to be able to rotate around the Y axis.

That is, of the vibration applied to the digital camera 10, yawing, pitching, rolling, and correction of translational components in the X direction and Z direction can be handled.
As a camera shake correction of a digital still camera that has been put into practical use so far, it has been common to correct yawing and pitching, but according to experiments conducted by the present inventor, a small and lightweight digital camera has been used. In the camera, it has been found that the influence of rolling shake caused by the shutter release cannot be ignored.

  Therefore, in this embodiment, a digital camera that supports rolling correction at the time of shooting will be described.

  Here, of the conventional cameras with camera shake correction function, considering the camera that can check the subject during the shooting preparation operation with the optical viewfinder, the camera does not perform the camera shake correction in the viewfinder, but the camera shake correction is performed only during shooting. There have been two systems: a correction system and a camera shake correction system that performs equivalent shake correction on both the viewfinder and the captured image.

  The former method is not suitable for aiming for a photo opportunity while gazing at the facial expression and movement of the subject in an environment in which camera shake is likely to occur. On the other hand, when the same shake correction is performed on the viewfinder and the photographed image as in the latter case, in order to cope with the rolling correction, a large prism or the like is driven, so that the inertial force is large and the sharp shake is dealt with. There was a problem that it was difficult.

  Therefore, in the camera according to the present embodiment, rolling, which is mainly caused by shutter release, is handled only during shooting, and the viewfinder is effective with a simple configuration by performing camera shake correction other than rolling. The camera shake correction function is realized.

  FIG. 4 is a cross-sectional view showing the configuration of the optical finder unit 27 described above.

  In FIG. 4, the incident light beam that has passed through the objective lens 41 passes through the half mirror 42 and is guided to the eyepiece lens 43. On the other hand, the light passing through the frame 44 is reflected by the mirror 45 and the half mirror 42 and reaches the eyepiece 43. As a result, a frame is added to the finder image.

Coils 47 and 48 are fixed to the objective lens 41, and a part of each of the coils is positioned in a magnetic field generated by the permanent magnet 46. Then, by energizing the coils 47 and 48, the objective lens 41 is driven in the X-axis direction and the Z-axis direction in FIG. As a result, among the vibrations applied to the digital camera 10, yawing, pitching, and correction of translational components in the X-axis direction and the Z-axis direction are possible.
Next, with reference to the flowchart of FIG. 5, the operation at the time of shooting by the camera in the first embodiment will be described.

  Note that, for example, operations such as AE and automatic white balance (AWB) that are not directly related to the shake correction are omitted here.

  First, when the shutter button 21 is half-pressed in step S1, a distance measuring operation is immediately executed in subsequent step S2. In step S3, a correction operation corresponding to the subject distance is started for yawing and pitching.

  Next, in step S4, it is determined whether or not the half-pressed state of the shutter button 21 is released. If the half-pressed state is released, the process proceeds to step S8 and the correction operation is completed, and then the process is completed. On the other hand, if the half-pressed state of the shutter button 21 is not released in step S4, the process proceeds to step S5 to determine whether or not the shutter button 21 is fully pressed.

  Here, when the shutter button 21 is in the fully depressed state, the process proceeds to step S6 and the rolling correction operation is started. Then, after the exposure operation is executed in the subsequent step S7, the correction operation is terminated in step S8, and then this process is completed.

  On the other hand, if the shutter button 21 is not fully pressed in step S5, the process proceeds to step S4, and the determination of the state of the shutter button 21 is continued.

  In this way, yawing and pitching are corrected during the shooting preparation operation starting with the half-pressing operation of the shutter button 21, and rolling correction is further performed during shooting for actual exposure, thereby mainly resulting from the shutter release. Effective and lean correction is realized for rolling, which is shake.

  In this embodiment, the shooting preparation operation is started by half-pressing the shutter button 21, but may be started by detecting that the finger touches the shutter button 21 or the grip, for example. Alternatively, it may be started by a switch operation provided separately from the shutter button 21.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.

  FIG. 6 is a schematic diagram of optical elements of a digital single-lens reflex camera according to the second embodiment of the present invention. Hereinafter, the second embodiment will be described with reference to FIG.

  Note that the configuration of the camera in the second embodiment is basically the same as that of the first embodiment shown in FIGS. 1 to 5, and therefore only the different configuration will be described and the other identical ones. Parts are denoted by the same reference numerals, and illustration and description thereof are omitted.

  In FIG. 6, the digital single-lens reflex camera 85 includes a camera body 86 and a lens frame module 87 that is detachably attached to the front surface of the camera body 86.

  The lens frame module 87 has a photographing lens 89. The light beam transmitted through the photographing lens 89 is guided to the movable mirror 90 in the camera body 86.

  The movable mirror 90 in the camera body 86 is provided so as to be movable in and out of the photographing optical path. When the movable mirror 90 is lowered into the photographing optical path as shown in the figure, the photographing light beam from the photographing lens 89 is reflected by the movable mirror 90 and imaged on the focusing screen 91.

  Then, after being reflected by the mirror A 94 through the prism 93 integrally formed with the first field lens 92, the light passes through the relay lens 95. Further, after being reflected by the mirror B98, it passes through the second field lens 99, is reflected by the mirror C100, and reaches the eyepiece 101.

  On the other hand, although not shown, when the movable mirror 90 is retracted out of the photographing optical path, the photographing light beam transmitted through the photographing lens 89 is taken into the CCD 103.

  In order to perform camera shake correction of the observation system, the relay lens 95 is decentered (shifted) in a plane perpendicular to the optical axis by a general driving means during the shooting preparation operation, or the relay lens 95 is set to the optical axis. A method such as tilting with respect to the screen may be used.

  In this manner, correction for yawing and pitching is performed during the shooting preparation operation.

  And at the time of imaging | photography, the imaging part position drive unit 23 is driven, and correction with respect to yawing, pitching, and rolling is performed.

  Since the operation flow in the second embodiment is the same as that in the first embodiment described above, a description thereof will be omitted.

(Third embodiment)
Next, a third embodiment of the present invention will be described.

  FIG. 7 is a perspective view schematically showing a part of the external configuration of a digital camera according to the third embodiment of the present invention, and FIG. 8 is a block diagram showing a schematic configuration of the system.

  The configuration of the camera in the third embodiment is basically the same as that of the first embodiment shown in FIGS. 1 to 5, and therefore only the different configuration will be described and the other identical ones. Parts are denoted by the same reference numerals, and illustration and description thereof are omitted.

  The digital camera 105 according to the third embodiment has a configuration in which the optical finder unit is removed from the digital camera according to the first embodiment described above. That is, in the digital camera 105, the camera body 106 is not provided with an optical finder, and framing is performed using the liquid crystal monitor 28.

In the imaging unit position driving unit 23, yawing, pitching, rolling, and correction of translational components in the X direction and the Z direction are performed as in the first embodiment described above.
By driving the imaging unit position driving unit 23 during the shooting preparation operation, the liquid crystal monitor 28 corresponding to the finder can also correct yawing, pitching, rolling, and translational components in the X-axis direction and the Z-axis direction. it can. However, as described above, the rolling shake is mostly generated during shutter release, and during the shooting preparation operation, in addition to the liquid crystal monitor 28, the power consumption is large, such as high-speed driving of the CCD 22 and AF motor driving. Because of the situation, the rolling correction is omitted during the shooting preparation operation.

  That is, during the shooting preparation operation, the CCD 22 is driven in the Z-axis direction and the X-axis direction by energizing the VCM 70 and VCM 76 to cope with correction of yawing and pitching among vibrations applied to the digital camera 105. By restricting the driving of, effective camera shake correction can be realized while saving power consumption.

  At the time of photographing, driving of the motor 81 is permitted, and in addition to yawing and pitching correction, rolling correction is also supported.

  In this embodiment, the camera shake correction at the time of the shooting preparation operation has been described by the method of moving the CCD 22. However, as a camera shake electronic camera shake correction, a general camera shake correction by cutting out the imaging area is performed. Sometimes, it may be controlled to physically move the CCD during still image shooting.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described.

  FIG. 9 is a perspective view schematically showing a configuration of a digital camera according to the fourth embodiment of the present invention through a part thereof, FIG. 10 is a block diagram showing a schematic configuration of the system, and FIG. It is the perspective view which showed the structure of the imaging part position drive unit 118 which concerns on the 4th Embodiment of invention.

  The configuration of the camera in the fourth embodiment is basically the same as that of the first to third embodiments shown in FIGS. 1 to 8, and therefore only the different configuration will be described. The same parts are denoted by the same reference numerals, and illustration and description thereof are omitted.

  A shutter button 21 is provided on the upper part of the main body 111 of the digital camera 110. The camera body 111 includes angular velocity sensors 25a, 25b, and 25c for detecting vibration, a liquid crystal monitor 28, and the like.

  The lens frame module 12 is provided with a first group lens 14, a second group lens 15, a third group lens 16, a fourth group lens 17, a diaphragm 18, and a shutter 20. The light beam that has passed through the first group lens 14 and the second group lens 15 passes through the stop 18 and then passes through the third group lens 16 and the fourth group lens 17.

  Here, the movable mirror 113 has the same configuration as a quick return mirror of a general single-lens reflex camera, and when the movable mirror 113 is lowered, the light beam reflected by the movable mirror 113 is an image sensor. 114 is imaged. The image sensor 114 is an element capable of high-speed reading such as a CMOS sensor, for example, and a live view of 60 frames or more per second is displayed on the electronic viewfinder unit 115.

  In addition, the imaging area of the imaging element 114 is set wider than the imaging area of the CCD 22. Then, in the same way as the electronic camera shake correction generally used in a camcorder, the camera shake correction during the shooting preparation operation is performed by appropriately changing the cutout position.

  In this camera, processing such as AE and AF is also performed based on the output of the image sensor 114.

  On the other hand, when the movable mirror 113 is raised, the light beam transmitted through the fourth group lens 17 is imaged on the CCD 22. The CCD 22 is fixed to the imaging unit position driving unit 118. In response to an instruction from the controller 30, position control in the X-axis and Z-axis directions is performed by the imaging unit position control unit 37.

  The controller 30 controls the entire digital camera 110, and the control program is stored in advance in the ROM in the memory 39. The memory 39 also includes a RAM, which is used as a working storage area when the controller 30 executes the control program.

  The zoom control unit A31 controls the second group lens 15 based on an instruction from the controller 30, and the zoom control unit B32 controls the third group lens 16 and the fourth group lens 17 based on an instruction from the controller 30. . The angle of view is adjusted by these controls. The focus control unit 34 drives the fourth group lens 17 based on an instruction from the controller 30 to perform focus adjustment. The aperture control unit 33 controls the aperture 18 based on an instruction from the controller 30.

  As described above, the imaging unit position control unit 37 shifts the position of the CCD 22 based on an instruction from the controller 30, and the shift amount depends on the output signals from the angular velocity sensors 25 a and 25 b, the focal length, and the subject. Control is based on distance information and the like.

  The control circuit 50 is for controlling the imaging element 114 and the imaging processing unit 122 according to instructions from the controller 33. Similarly, the control circuit 120 is for controlling the CCD 22 and the imaging processing unit 121 according to instructions from the controller 33.

  The signal processing unit 124 performs processing such as white balance and γ correction on the captured image data output from the imaging processing unit 122 and the image data output from the compression / decompression processing unit 53. The signal processing unit 124 includes an AE detection circuit and an AF detection circuit.

  A digital signal (image data) output from the signal processing unit 124 is recorded in the memory 125. In the DAC 126, the digital signal output from the signal processing unit 124 is converted into an analog signal. Based on the analog signal converted here, the EVF unit 127 displays an image.

  The image pickup unit position drive unit 118 will be described. The image pickup voltage value drive unit 23 shown in FIG. 3 omits the rolling correction motor 81, the gear 79, and the worm gear 80, and the plate is replaced by an X slider instead of the rotor 78. Except for being fixed on 75, it is equivalent to the second and second embodiments.

  Hereinafter, with reference to the flowchart of FIG. 12, the operation at the time of shooting by the camera in the fourth embodiment will be described.

  It should be noted that the description of operations such as AE and AWB that are not directly involved in shake correction is omitted here.

  First, when the shutter button 21 is half-pressed in step S11, the distance measuring operation is immediately executed in the subsequent step S12. Next, in step S13, a correction operation corresponding to the subject distance is started for yawing and pitching.

  Here, in step S14, it is determined whether or not the half-pressed state of the shutter button 21 is released. As a result, if the half-pressed state is released, the process is completed after the process proceeds to step S19 to complete the correction operation. On the other hand, if it is determined in step S14 that the half-pressed state of the shutter button 21 has not been released, the process proceeds to step S15 to determine whether or not the shutter button 21 has been fully pressed.

  If the shutter button 21 has not been fully pressed, the process proceeds to step S14 and the determination of the state of the shutter button 21 is continued. On the other hand, if the shutter button 21 has been fully pressed in step S15, it is determined in step S16 whether the panning mode has been selected.

  Here, when the panning mode is selected, the process proceeds to step S17, and the correction operation in the casting direction is stopped among the correction operations for yawing and pitching. Then, after the exposure operation is executed in step S18, the correction operation is ended in step S19. Thereafter, this process is completed.

  If the panning mode is not selected in step S16, the correction operation for yawing and pitching is continued, the process proceeds to step S18, the exposure operation is executed, and the correction is made in step S19. The operation is terminated. Then, this process is completed.

  In this manner, yawing and pitching are corrected during the shooting preparation operation that starts when the shutter button 21 is half-pressed. When shooting is actually performed, one of the correction operations for yawing and pitching is stopped as necessary, so that the influence of shake is reduced when AE, AF, AWB, etc. are performed. In addition, a flexible correction that does not interfere with panning during shooting is realized.

  In this embodiment, the shooting preparation operation is started by half-pressing the shutter button 21, but may be started by detecting that a finger touches the shutter button 21 or the grip. You may make it start by switch operation provided separately.

  The embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

1 is a perspective view schematically showing a part of an external configuration of a digital camera according to a first embodiment of the present invention. It is a block diagram which shows schematic structure of the camera of FIG. 4 is a perspective view illustrating a configuration of an imaging unit position driving unit 23. FIG. FIG. 4 is a diagram showing a configuration of an optical finder unit 27. 5 is a flowchart for explaining an operation at the time of shooting by the camera in the first embodiment. It is a schematic diagram of the optical element of the digital single-lens reflex camera which concerns on the 2nd Embodiment of this invention. It is the perspective view which showed typically the external appearance structure of the digital camera which concerns on the 3rd Embodiment of this invention, seeing a part transparently. It is a block diagram which shows schematic structure of the system of the digital camera which concerns on 3rd Embodiment. It is the perspective view which showed typically the structure of the digital camera which concerns on the 4th Embodiment of this invention, seeing through one part. It is a block diagram which shows schematic structure of the system of the digital camera which concerns on 4th Embodiment. It is the perspective view which showed the structure of the imaging part position drive unit 118 which concerns on the 4th Embodiment of this invention. It is a flowchart explaining the operation | movement at the time of imaging | photography of the camera in 4th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Digital camera, 11 ... Camera body, 12 ... Mirror frame module, 20 ... Shutter, 21 ... Shutter button, 22 ... CCD, 23 ... Imaging part position drive unit, 25a, 25b, 25c ... Angular velocity sensor, 27 ... Optical viewfinder Unit: 28 ... Liquid crystal monitor, 30 ... Controller, 31 ... Zoom controller A, 32 ... Zoom controller B, 33 ... Aperture controller, 34 ... Focus controller, 36 ... Shutter controller, 37 ... Imaging position controller, 39, 58 ... Memory, 40 ... Observation voltage position control unit, 41 ... Objective lens, 42 ... Half mirror, 43 ... Eyepiece, 44 ... Frame frame, 45 ... Mirror, 46 ... Permanent magnet, 47, 48 ... Coil, 50 ... Control circuit 51 ... Imaging processing unit 52 ... Signal processing unit 53 ... Compression / decompression processing unit 61 ... I / F (interface) unit 62 ... P Sonar computer (PC), 65 ... base, 66, 67, 72, 73 ... shaft, 70, 76 ... VCM (voice coil motor), 75 ... X slider, 69 ... Z slider, 78 ... rotor, 79 ... gear, 80 ... worm gear, 81 ... motor.

Claims (38)

An image shake correction method that performs shake correction in accordance with relative shake between a subject and an imaging device,
An image blur correction method characterized by performing individual corrections in each of a shooting preparation operation and a shooting operation. The relative shake between the subject and the imaging device includes at least one of translational vibration in a plurality of coordinate axis directions and rotational vibration around each coordinate axis,
2. The image blur correction method according to claim 1, wherein the first correction performed at the time of shooting preparation and the second correction performed at the time of imaging differ in at least a part of a target degree of vibration freedom.   The image blur correction method according to claim 2, wherein at least a part of the vibration targeted by the first correction is included in the vibration targeted by the second correction.   The image blur correction method according to claim 3, wherein at least a part of the vibrations targeted by the second correction is not included in the vibrations targeted by the first correction.   5. The vibration that is included in the vibration targeted for the second correction and that is not included in the vibration targeted for the first correction is rotational vibration around the optical axis of the photographing lens. The image blur correction method described in 1.   The image blur correction method according to claim 2, wherein at least a part of the vibration targeted by the second correction is included in the vibration targeted by the first correction.   The image blur correction method according to claim 6, wherein at least a part of the vibration targeted for the first correction is not included in the vibration targeted for the second correction.   The vibration included in the vibration targeted for the first correction and not included in the vibration targeted for the second correction is at least one of rotational vibrations around the axis other than the optical axis of the photographing lens. The image blur correction method according to claim 7, wherein:   The vibration that is included in the vibration targeted for the first correction and is not included in the vibration targeted for the second correction is at least one of a plurality of axial translational vibrations. The image blur correction method according to claim 7. Image blur correction means for performing shake correction corresponding to the relative shake between the subject and the imaging device;
An image blur correction apparatus that performs individual correction in each of a shooting preparation operation and a shooting operation. The correction unit includes a first correction unit that performs correction at the time of shooting preparation, and a second correction unit that performs correction at the time of imaging.
The relative shake between the subject and the imaging device includes at least a part of translational vibration in the direction of a plurality of coordinate axes and rotational vibration around each coordinate axis,
The image blur correction apparatus according to claim 10, wherein the first correction unit and the second correction unit are different from each other in at least a part of a target vibration degree of freedom.   12. The image blur correction device according to claim 11, wherein at least a part of the vibration targeted by the first correction means is included in the vibration targeted by the second correction means.   13. The image blur correction device according to claim 12, wherein at least a part of vibrations targeted by the second correction unit is not included in the vibrations targeted by the first correction unit.   The vibration included in the vibration targeted by the second correction means and not included in the vibration targeted by the first correction means is a rotational vibration around the optical axis of the photographing lens. Item 14. The image blur correction device according to Item 13.   12. The image blur correction device according to claim 11, wherein at least part of the vibration targeted by the second correction unit is included in the vibration targeted by the first correction unit.   16. The image blur correction device according to claim 15, wherein at least a part of the vibrations targeted by the first correction unit is not included in the vibrations targeted by the second correction unit.   The vibration that is included in the vibration that is targeted by the first correction unit and that is not the target of the second correction unit is rotational vibration about an axis that is orthogonal to the optical axis of the photographic lens. Item 17. The image blur correction device according to Item 16.   The vibration included in the vibration targeted by the first correction unit and not targeted by the second correction unit is a translational vibration orthogonal to the optical axis of the photographing lens, respectively. The image blur correction apparatus described.   An optical system related to the imaging apparatus includes a movable mirror that selectively switches an optical path, and the first correction unit and the second correction unit among different optical paths switched by the movable mirror are different optical paths. The image blur correction device according to claim 10, wherein the image blur correction device is disposed at a position adjacent to the image blur correction device. An image shake correction method for detecting a signal corresponding to a relative shake between a subject and an imaging apparatus and performing shake correction based on the detected signal,
A first correction step of correcting image blur during the shooting preparation operation of the imaging apparatus;
A second correction step of correcting image blur during a shooting operation following the shooting preparation operation;
An image blur correction method comprising: The relative shake between the subject and the imaging apparatus is orthogonal to the optical axis direction that is the first direction, the second direction orthogonal to the optical axis direction, and the first and second directions. Including at least one of translational vibration in the third direction and rotational vibration about the respective axes in the first, second, and third directions,
21. The image blur correction method according to claim 20, wherein the first correction step and the second correction step are different in at least a part of the degree of freedom of vibration to be corrected.   22. The image blur correction method according to claim 21, wherein at least a part of the vibration targeted for correction by the first correction step is included in the vibration targeted for correction by the second correction step. .   23. The image blur correction according to claim 22, wherein at least a part of vibrations to be corrected by the second correction step is different from vibrations to be corrected by the first correction step. Method.   The vibration that is included in the vibration targeted for the correction in the second correction step and that is different from the vibration targeted for the correction in the first correction step is a rotational vibration around the optical axis of the photographing lens. The image blur correction method according to claim 23.   The image blur correction method according to claim 21, wherein at least a part of the vibration targeted for the correction in the second correction step is included in the vibration targeted for the correction in the first correction step. .   26. The image blur correction according to claim 25, wherein at least a part of the vibration targeted for the correction in the first correction step is different from the vibration targeted for the correction in the second correction step. Method.   The vibration that is included in the vibration targeted for the correction in the first correction step and that is different from the vibration targeted for the correction in the second correction step is the rotational vibration around the axes in the second and third directions. 27. The image blur correction method according to claim 26, wherein the image blur correction method is at least one of them.   The vibration that is included in the vibration targeted for the correction in the first correction step and is different from the vibration targeted for the correction in the second correction step is at least one of a plurality of axial translational vibrations. 27. The image blur correction method according to claim 26. Shake detection means for detecting relative shake between the subject and the imaging device;
A first correction unit that corrects an image blur based on a signal from the shake detection unit, and performs correction during a shooting preparation operation of the imaging apparatus;
A second correction unit that corrects image blur based on a signal from the shake detection unit, and performs a correction different from the first correction unit during a shooting operation following the shooting preparation operation;
An image blur correction apparatus comprising: The relative shake between the subject and the imaging apparatus is orthogonal to the optical axis direction that is the first direction, the second direction orthogonal to the optical axis direction, and the first and second directions. At least a part of the translational vibration in the third direction and the rotational vibration around the respective axes in the first, second, and third directions,
30. The image blur correction device according to claim 29, wherein the first correction unit and the second correction unit are different in at least a part of a target vibration degree of freedom.   30. The image blur correction device according to claim 29, wherein at least part of the vibration targeted by the first correction means is included in the vibration targeted by the second correction means.   32. The image blur correction device according to claim 31, wherein at least a part of vibrations targeted by the second correction unit is different from vibrations targeted by the first correction unit.   The vibration included in the vibration targeted by the second correction means and different from the vibration targeted by the first correction means is rotational vibration around the optical axis of the photographing lens. 32. An image blur correction device according to 32.   31. The image blur correction device according to claim 30, wherein at least part of the vibration targeted by the second correction unit is included in the vibration targeted by the first correction unit.   35. The image blur correction device according to claim 34, wherein at least a part of vibrations targeted by the first correction unit is different from vibrations targeted by the second correction unit.   The vibration included in the vibration targeted by the first correction means and not targeted by the second correction means is rotational vibration around the axes in the second and third directions. Item 35. The image blur correction device according to Item 35.   36. The vibration included in the vibration targeted by the first correction means and not targeted by the second correction means is translational vibration in the second and third directions. The image blur correction apparatus described.   An optical system related to the imaging apparatus includes a movable mirror that selectively switches an optical path, and the first correction unit and the second correction unit among different optical paths switched by the movable mirror are different optical paths. 38. The image blur correction device according to claim 29, wherein the image blur correction device is disposed in the position.

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