JP2020095071A - Interchangeable lens and image capturing device - Google Patents

Abstract

To allow for applying image blur correction to where blur needs to be eliminated.SOLUTION: An interchangeable lens attachable to a camera body is provided, the interchangeable lens comprising: a motion detection unit for detecting motion of the interchangeable lens; a reception unit configured to receive information on a position of a blur-correction-target object image, a portion of an entire object image, formed at a position off an optical axis of an image capturing optical system; a correction amount computation unit configured to compute a correction amount for correcting for blur of the object image formed at the position off an optical axis of the image capturing optical system, as received by the reception unit, according to the motion detected by the detection unit; and a blur correction optical system configured to correct for the blur of the object image formed at the position off the optical axis using the correction amount.SELECTED DRAWING: Figure 1

Description

The present invention relates to an interchangeable lens and an imaging device.

A technique for suppressing image blur due to camera shake is known (see Patent Document 1). However, the image blur in the central portion of the screen is corrected.

JP, 2007-235806, A

According to the first aspect, in the interchangeable lens that can be attached to the camera body, the motion detection unit that detects the movement of the interchangeable lens, and the subject that is included in the subject image and that is outside the optical axis of the imaging optical system and that corrects blurring. The receiving unit that receives information on the position of the image and a correction amount that is received by the receiving unit and that corrects the blur of the subject image formed at a position outside the optical axis of the imaging optical system are detected by the detecting unit. A correction amount calculation unit that calculates based on the detected movement, and a shake correction optical system that corrects the shake of the subject image formed at the position off the optical axis based on the correction amount are provided.
According to the second aspect, in an image pickup apparatus having a camera body for picking up a subject image formed by an image pickup optical system and an interchangeable lens attachable to the camera body, the camera body is provided with the subject image. Of these, a transmission unit that transmits information about the position of a subject image that is outside the optical axis of the imaging optical system and that corrects blurring is provided, and the interchangeable lens includes a motion detection unit that detects movement of the interchangeable lens; A receiver that receives information on the position of the subject image for correcting the blur transmitted from the transmitter of the camera body, and a subject that is received by the receiver and forms an image at a position outside the optical axis of the imaging optical system. A correction amount calculation unit that calculates a correction amount for correcting image blur based on the motion detected by the motion detection unit, and a blur of a subject image formed at a position off the optical axis as the correction amount. And a blurring correction optical system for performing correction based on the above.

It is a figure which shows the principal part structure of the camera by 1st Embodiment. It is a figure explaining a blurring correction part. It is a schematic diagram explaining the detection direction of an angular velocity and the image blur in an image surface. It is a figure explaining the image blur of FIG. It is a figure which illustrates the focus area formed on the imaging screen. It is a figure explaining the example which determines one representative position from several candidates. It is a figure explaining the modification 2 of 1st Embodiment. It is a schematic diagram explaining the detection direction of an angular velocity and the image blur in an image surface. It is a figure explaining the example which distortion has arisen. It is a figure which shows the principal part structure of the camera by 3rd Embodiment. It is a figure explaining the blurring correction part of an interchangeable lens.

(First embodiment)
An image pickup apparatus equipped with the image shake correction apparatus according to the first embodiment will be described with reference to the drawings. As an example of the image pickup apparatus, a lens interchangeable type digital camera (hereinafter, referred to as a camera 1) is illustrated. However, the camera 1 is a single lens reflex type in which a camera body 2 includes a mirror 24, or a mirrorless type including no mirror 24. You can type.
Further, the camera 1 may be configured as a lens integrated type in which the interchangeable lens 3 and the camera body 2 are integrated.
Furthermore, the image pickup apparatus is not limited to the camera 1, and may be a lens barrel having an image pickup sensor, a smartphone having an image pickup function, or the like.

<Camera main configuration>
FIG. 1 is a diagram showing a main configuration of the camera 1. The camera 1 includes a camera body 2 and an interchangeable lens 3. The interchangeable lens 3 is attached to the camera body 2 via a mount portion (not shown). When the interchangeable lens 3 is attached to the camera body 2, the camera body 2 and the interchangeable lens 3 are electrically connected, and communication between the camera body 2 and the interchangeable lens 3 becomes possible.
The communication between the camera body 2 and the interchangeable lens 3 may be performed by wireless communication.

In FIG. 1, light from a subject is incident in the negative Z-axis direction. Further, as shown in the coordinate axes, the front side of the paper surface orthogonal to the Z axis is the X axis plus direction, and the upward direction orthogonal to the Z axis and the X axis is the Y axis plus direction. In some of the subsequent figures, the coordinate axes are displayed so that the orientation of each figure can be understood with reference to the coordinate axes in FIG.

<Interchangeable lens>
The interchangeable lens 3 has an imaging optical system (imaging optical system), and forms a subject image on the imaging surface of the imaging device 22 provided in the camera body 2. The imaging optical system includes a zoom optical system 31, a focus (focus adjustment) optical system 32, a shake correction optical system 33, and a diaphragm 34. The interchangeable lens 3 further includes a zoom drive mechanism 35, a focus drive mechanism 36, a shake correction drive mechanism 37, an aperture drive mechanism 38, and a shake sensor (motion detection unit, shake detection unit) 39.

The zoom drive mechanism 35 moves the zoom optical system 31 forward and backward in the direction of the optical axis L1 based on a signal output from the CPU 21 of the camera body 2 to adjust the magnification of the imaging optical system. The signal output from the CPU 21 includes information indicating the moving direction, moving amount, moving speed, etc. of the zoom optical system 31.

The focus drive mechanism 36 moves the focus optical system 32 back and forth in the direction of the optical axis L1 based on a signal output from the CPU 21 of the camera body 2 to adjust the focus of the imaging optical system. The signal output from the CPU 21 during focus adjustment includes information indicating the moving direction, moving amount, moving speed, etc. of the focus optical system 32.
Further, the diaphragm drive mechanism 38 controls the aperture diameter of the diaphragm 34 based on a signal output from the CPU 21 of the camera body 2.

The blur correction drive mechanism 37 cancels a blur (referred to as image blur) of a subject image on the imaging surface of the image sensor 22 in a plane intersecting the optical axis L1 based on a signal output from the CPU 21 of the camera body 2. The image blurring is suppressed by moving the blurring correction optical system 33 forward and backward. The signal output from the CPU 21 includes information indicating the moving direction, moving amount, moving speed, and the like of the shake correction optical system 33.

The shake sensor 39 detects shake of the camera 1 when the camera 1 swings due to camera shake or the like. The shake sensor 39 includes an angular velocity sensor 39a and an acceleration sensor 39b. The image blur is caused by the shake of the camera 1.

The angular velocity sensor 39a detects the angular velocity generated by the rotational movement of the camera 1. The angular velocity sensor 39a detects rotations about axes such as an axis parallel to the X axis, an axis parallel to the Y axis, and an axis parallel to the Z axis, and sends a detection signal to the CPU 21 of the camera body 2. The angular velocity sensor 39a is also called a gyro sensor.

Further, the acceleration sensor 39b detects the acceleration generated by the translational movement of the camera 1. The acceleration sensor 39b detects, for example, an acceleration in an axis parallel to the X axis, an axis parallel to the Y axis, and an axis parallel to the Z axis, and sends a detection signal to the CPU 21 of the camera body 2. The acceleration sensor 39b is also called a G sensor.
In this example, the shake sensor 39 is provided on the interchangeable lens 3, but the shake sensor 39 may be provided on the camera body 2. The shake sensor 39 may be provided on both the camera body 2 and the interchangeable lens 3.

<Camera body>
The camera body 2 includes a CPU 21, an image sensor 22, a shutter 23, a mirror 24, an AF sensor 25, a shake correction drive mechanism 26, a signal processing circuit 27, a memory 28, an operation member 29, and a liquid crystal display. And a unit 30.

The CPU 21 includes a CPU, a RAM (Random Access Memory), a ROM (Read Only Memory), and the like, and controls each unit of the camera 1 based on a control program. The CPU 21 includes a blur correction unit (correction amount calculation unit) 21a.

The blur correction unit 21a calculates an image blur caused by the rotational movement of the camera 1 and the translational movement of the camera 1. The CPU 21 moves the shake correction optical system 33 by the shake correction drive mechanism (shake correction drive unit) 37 based on the calculation result by the shake correction unit 21 a, and moves the shake correction optical system 33 by the shake correction drive mechanism (shake correction drive unit) 26. 22 is moved.

In the first embodiment, the image blur is suppressed by moving the blur correction optical system 33 of the interchangeable lens 3 forming the image pickup optical system or the image sensor 22. Such image blur suppression is also referred to as image blur correction. Details of the image blur correction will be described later.

The image sensor 22 of FIG. 1 is composed of a CCD image sensor or a CMOS image sensor. The image pickup device 22 receives the light flux that has passed through the image pickup optical system on the image pickup surface and photoelectrically converts (images) the subject image. By photoelectric conversion, electric charges are generated in each of the plurality of pixels arranged on the image pickup surface of the image pickup device 22 according to the amount of received light. A signal based on the generated charges is read from the image sensor 22 and sent to the signal processing circuit 27.

The shutter 23 controls the exposure time of the image sensor 22. The exposure time of the image sensor 22 is also controllable by a method of controlling the charge storage time in the image sensor 22 (so-called electronic shutter control). The shutter 23 is opened and closed by a shutter drive unit (not shown).

The semi-transmissive quick return mirror (hereinafter referred to as a mirror) 24 is driven by a mirror driving unit (not shown) to move the mirror 24 to the down position (illustrated in FIG. 1) on the optical path, and the mirror 24 moves to the optical path. Move between the up position to evacuate outside. For example, before release, the subject light is reflected by a mirror 24 that has moved to the down position to a finder unit (not shown) provided above (Y-axis plus direction). Further, a part of the subject light that has passed through the mirror 24 is bent downward (in the Y-axis minus direction) by the sub-mirror 24 a and guided to the AF sensor 25.
Immediately after pressing the release switch, the mirror 24 is rotated to the up position. As a result, the subject light is guided to the image sensor 22 via the shutter 23.

The AF sensor 25 detects the focus adjustment state of the interchangeable lens 3 by the image pickup optical system. The CPU 21 uses the detection signal from the AF sensor 25 to perform a well-known phase difference type focus detection calculation. The CPU 21 obtains the defocus amount by the image pickup optical system by this calculation, and calculates the movement amount of the focus optical system 32 based on the defocus amount. The CPU 21 transmits the calculated movement amount of the focus optical system 32 to the focus drive mechanism 36 together with the movement direction and the movement speed.

The blur correction drive mechanism 26 moves the image pickup device 22 forward and backward in a plane that intersects with the optical axis L1 in a direction that cancels the image blur on the basis of a signal output from the CPU 21, and the image on the image pickup surface of the image pickup device 22 is moved. Reduce blurring. The signal output from the CPU 21 includes information indicating the moving direction, moving amount, moving speed, etc. of the image sensor 22.

The signal processing circuit 27 generates image data relating to the subject image based on the signal of the image read from the image sensor 22. Further, the signal processing circuit 27 performs predetermined image processing on the generated image data. The image processing includes, for example, known image processing such as gradation conversion processing, color interpolation processing, edge enhancement processing, and white balance processing.

The memory 28 is configured by, for example, an EEPROM (Electrically Erasable Programmable Read Only Memory), a flash memory, or the like. Adjustment value information such as a detection gain set in the shake sensor 39 is recorded in the memory 28. Recording of data in the memory 28 and reading of data from the memory 28 are performed by the CPU 21.

The operation member 29 includes a release button, a recording button, a live view button, various setting switches, and the like, and outputs an operation signal corresponding to each operation to the CPU 21.
In response to an instruction from the CPU 21, the liquid crystal display unit 30 displays an image based on image data, information regarding shooting such as shutter speed and aperture value, and a menu operation screen.

The recording medium 50 is composed of, for example, a memory card that can be attached to and detached from the camera body 2. Image data, audio data, and the like are recorded on the recording medium 50. The CPU 21 records data on the recording medium 50 and reads data from the recording medium 50.

<Image blur correction>
The camera 1 according to the first embodiment can perform image blur correction performed by operating the blur correction drive mechanism 37 of the interchangeable lens 3 and image blur correction performed by operating the blur correction drive mechanism 26 of the camera body 2. Is configured. In the first embodiment, the CPU 21 operates one of the shake correction drive mechanisms. For example, when the interchangeable lens 3 including the blur correction drive mechanism 37 is attached to the camera body 2, the CPU 21 operates the blur correction drive mechanism 37 of the interchangeable lens 3 to perform image blur correction, and the blur correction drive mechanism. When the interchangeable lens 3 not equipped with 37 is attached to the camera body 2, the image blur correction is performed by operating the image blur correction drive mechanism 26 of the camera body 2.
Note that the interchangeable lens 3 and the shake correction drive mechanism of the camera body 2 may be operated simultaneously, as in the third embodiment described later.

Generally, the image blur generated in the camera 1 is divided into an image blur caused by the rotational movement of the camera 1 (also referred to as an angular blur) and an image blur caused by the translational movement of the camera 1 (also referred to as a translational blur). The blur correction unit 21a calculates the image blur caused by the rotational movement of the camera 1 and the image blur caused by the translational movement of the camera 1.

FIG. 2 is a diagram illustrating the blur correction unit 21a. The blur correction unit 21a includes an angle blur calculation unit 201, a translation blur calculation unit 202, and a blur correction optical system target position calculation unit (selection unit) 203.
The angular blur calculation unit 201 calculates the image blur in the Y-axis direction due to the rotational movement using the detection signal around the axis (Pitch direction) parallel to the X-axis by the angular velocity sensor 39a. Further, the angle blur calculation unit 201 calculates the image blur in the X axis direction due to the rotational movement by using the detection signal around the axis parallel to the Y axis (Yaw direction) by the angular velocity sensor 39a.

The translational blur calculation unit 202 calculates the image blur in the X-axis direction due to the translational motion using the detection signal in the X-axis direction from the acceleration sensor 39b. Further, the translational shake calculation unit 202 calculates the image shake in the Y-axis direction due to the translational motion by using the detection signal in the Y-axis direction from the acceleration sensor 39b.

The shake correction optical system target position calculation unit 203 calculates the image shake in the X-axis direction and the Y-axis direction calculated by the angle shake calculation unit 201 and the image shake in the X-axis direction and the Y-axis direction calculated by the translation shake calculation unit 202. Image blurring in the X-axis direction and image blurring in the Y-axis direction is calculated by adding the blurring for each axis. For example, when the image blur calculated by the angle blur calculation unit 201 and the direction of the image blur calculated by the translational blur calculation unit 202 are the same in a certain axial direction, the image blur increases due to the addition, but the calculated 2 When the directions of the two image blurs are different, the image blurs are reduced by the addition. In this way, positive and negative signs are attached according to the direction of the image blur of each axis, and the addition operation is performed.

Next, the shake correction optical system target position calculation unit 203 calculates the image shake in the X-axis direction and the Y-axis direction after addition, the photographing magnification (calculated based on the position of the zoom optical system 31), and the camera 1 Based on the distance to the subject 80 (calculated based on the position of the focus optical system 32), the image blur amount at a predetermined position on the image surface (the image pickup surface of the image pickup device 22) is calculated.

The blur correction optical system target position calculation unit 203 moves the blur correction optical system 33 in a direction to cancel the calculated image blur amount when the blur correction drive mechanism 37 of the interchangeable lens 3 is operated to perform the image blur correction. The target position of the shake correction optical system 33 is calculated.
Further, when the shake correction optical system target position calculation unit 203 operates the shake correction drive mechanism 26 of the camera body 2 to perform the image shake correction, the image pickup for moving the image pickup element 22 in the direction in which the calculated image shake amount is canceled. The target position of the element 22 is calculated.

Then, the shake correction optical system target position calculation unit 203 sends a signal indicating the target position to the shake correction drive mechanism 37 of the interchangeable lens 3 or the shake correction drive mechanism 26 of the camera body 2.
The blur correction optical system target position calculation unit 203 can also send a signal indicating the target position to each of the interchangeable lens 3 and the blur correction drive mechanism of the camera body 2.
When the target position transmitted from the camera body 2 exceeds the movable range of the shake correction drive mechanism 37, the shake correction drive mechanism 37 of the interchangeable lens 3 notifies the CPU 21 of the camera body 2 to that effect. Good. As a result, the CPU 21 can take measures such as issuing an alarm notifying that the allowable range for image blur correction has been exceeded.

<Image blurring at a predetermined position>
The calculation of the image blur by the angle blur calculation unit 201 will be described in more detail. In the first embodiment, when the angle blur calculation unit 201 calculates the image blur caused by the rotational movement of the camera 1, the position on the image plane (the image plane of the image sensor 22) is determined in advance and the position is determined. Calculate the image blur of. The reason for doing this is that the image blur varies depending on the position of the image plane even if the rotational angle of the rotational movement is the same.

FIG. 3 is a schematic diagram illustrating the detection direction of the angular velocity by the angular velocity sensor 39a and the image blur on the image plane 70 (the image plane of the image sensor 22). In FIG. 3, the intersection of the image plane 70 and the optical axis L1 of the interchangeable lens 3 is the origin of the coordinates, the optical axis L1 of the interchangeable lens 3 is the Z axis, and the image plane 70 is the XY plane. According to FIG. 3, the optical axis L1 intersects the center of the imaging surface. The interchangeable lens 3 and the subject 80 are located in the Z axis plus direction with respect to the image plane 70. The angular velocity sensor 39a detects, for example, a rotation angle θ around an axis (small-x axis) parallel to the X axis (Pitch direction). When the subject 80 is far away, the symbol f in FIGS. 3 and 4 indicates the focal length.

When the camera 1 shakes, the image of the subject 80 located at the coordinates (0, yp) on the image plane 70 before the shake moves in the Y-axis minus direction after the shake. The position of the image of the moved subject 80 is at coordinates (0,yp-Δy2). FIG. 4 is a diagram for explaining the image blur Δy2 in FIG. 3, and represents the YZ plane in FIG.

The image blur Δy2 is expressed by the following equation (1).
Δy2=f×tan(θ+tan ⁻¹ (yp/f))−yp (1)
However, the rotation angle in the Pitch direction (representing the camera shake angle, which is generally about 0.5 degrees) is θ. When the subject 80 is far away, the symbol f in FIGS. 3 and 4 represents the focal length of the interchangeable lens 3.

In order to compare with the above equation (1), the image blur Δy1 of the image of the subject 80 located at the coordinate (0,0) of the center of the image plane 70 before the camera 1 shakes will be described. It is assumed that the rotation angle of the interchangeable lens 3 in the Pitch direction is the same θ as above. When the camera 1 shakes, the image of the subject 80 located at the coordinates (0,0) on the image plane 70 before the shake moves in the negative Y-axis direction after the shake. The position of the image of the moved subject 80 is at coordinates (0,-Δy1).

When the image blur Δy1 is expressed by a mathematical expression, the following expression (2) is obtained.
Δy1=f×tan θ (2)
According to the above equations (1) and (2), when the focal length f is sufficiently larger than yp, the rotation angle θ (camera shake angle) is generally about 0.5 degree, and therefore it is considered that Δy1≈Δy2. be able to. That is, whether the position of the image of the subject 80 on the image plane 70 is at the center (the origin in this example) of the image plane 70 or at a position away from the center, in other words, the distance from the optical axis L1 is different. However, the image blur can be regarded as almost the same. This means that the position on the image plane 70 may be set anywhere to calculate the image blur. Therefore, for example, when image blur correction is performed based on the image blur calculated at the center of the image plane 70, the image of the subject 80 located at the center of the image plane 70 is also located at a position distant from the center of the image plane 70. Image blurring can be suppressed for all 80 images.

However, when the interchangeable lens 3 is a wide-angle lens and the focal length f is not sufficiently larger than yp, Δy1<Δy2. Therefore, it is necessary to determine the position on the image plane 70 to any one and calculate the image blur. For example, if the image blur correction is performed based on the image blur calculated at the center of the image plane 70, even if the image blur of the image of the subject 80 located at the center of the image plane 70 can be suppressed, the distance from the center of the image plane 70 is increased. With respect to the image of the subject 80 at the different positions, the image blur corresponding to the difference between Δy2 and Δy1 cannot be suppressed and remains. The difference between Δy2 and Δy1 becomes larger as the position where the image blur is calculated approaches the periphery of the image plane 70, that is, as the image height becomes higher.

<Position for calculating image blur>
In many cases, the user desires to suppress the image blur of the image of the main subject among the captured subjects 80. Therefore, the CPU 21 in the first embodiment determines a position on the image plane 70 at which the image of the main subject is highly likely to exist, as described later. Then, the angle blur calculation unit 201 calculates the image blur at the position determined by the CPU 21, and performs the image blur correction based on this image blur.
The CPU 21 selects one of the following methods (1) to (3) in order to determine the position where the image blur is calculated. After determining the position where the image blur is calculated, the CPU 21 resets (updates) the position where the image blur is calculated when, for example, the amount of movement of the camera 1 due to the composition change is detected. The shake sensor 39 also functions as a movement amount detector.

(1) Position of Focus Area The first method is to calculate the image blur at the position of the focus area. FIG. 5 is a diagram illustrating a focus area formed on the image pickup screen 90. The focus area is an area in which the AF sensor 25 detects the focus adjustment state, and is also called a focus detection area, a distance measuring point, or an auto focus (AF) point. In the first embodiment, eleven focus areas 25P-1 to 25P-11 are provided in advance in the imaging screen 90. The CPU 21 can obtain the defocus amount in the 11 focus areas.
Note that the number of focus areas 25P-1 to 25P-11 is an example, and may be larger or smaller than 11.

The CPU 21 sets the position on the image plane 70 where the image blur is calculated to the position corresponding to the selected focus area. Then, the angle blur calculation unit 201 calculates the image blur at the position determined by the CPU 21, and performs the image blur correction based on this image blur. The position where the image blur is calculated on the image plane 70 is set to the position corresponding to the selected focus area because the main subject is likely to exist at the position where the defocus amount for focus adjustment is obtained. is there.
The CPU 21 may select the focus area based on the operation signal from the operation member 29, or the CPU 21 may select the focus area corresponding to the subject 80 close to the camera 1. The CPU 21 can select the focus area corresponding to the subject 80 close to the camera 1 based on the position of the focus optical system 32, for example.
Further, the CPU 21 may select a focus area corresponding to the subject 80 having a high contrast in the image of the subject 80, or may select a focus area corresponding to the subject 80 having a high brightness value in the image of the subject 80.

(2) Position of subject The second method is to calculate the image blur at the position of the object (subject 80) that is reflected. For example, the CPU 21 recognizes an object appearing as the subject 80 in the live view image by a known object recognition process, and sets the position of the object (subject 80) in the live view image as the position of the main subject. Then, the position where the image blur is calculated on the image plane 70 is set to the position corresponding to the main subject. The angle blur calculation unit 201 calculates the image blur at the position determined by the CPU 21, and performs the image blur correction based on this image blur.

The live view image is a monitor image acquired by the image sensor 22 at a predetermined interval (for example, 60 fps) before the main imaging is performed. For example, when the live view button that constitutes the operation member 29 is operated, the CPU 21 keeps the mirror 24 rotated to the up position, and causes the image sensor 22 to start acquiring a live view image. The CPU 21 can also display the live view image on the liquid crystal display unit 30.

The CPU 21 can also track a moving object (subject 80) by sequentially updating the position of the main subject based on each frame of the live view image, for example. In this case, the angle blur calculation unit 201 sequentially calculates the image blur at the position sequentially updated by the CPU 21, thereby performing the image blur correction on the moving object (subject 80) when acquiring the live view image. To do.
Further, even when the camera 1 is panned, the CPU 21 can also track a moving object (subject 80) by sequentially updating the position of the main subject within each frame of the live view image.

The CPU 21 selects the second method and starts the object recognition process when the camera 1 is set to the imaging scene mode such as “landscape”, “cooking”, “flower”, and “animal”, for example. You may do it. Further, the object recognition target may be switched depending on the imaging scene mode such as “landscape”, “cooking”, “flower”, “animal” set in the camera 1.

(3) Face Position The third method is to calculate the image blur at the position of the face (subject 80) that appears in the image. For example, the CPU 21 recognizes the face shown as the subject 80 in the live view image by a known face recognition process, and sets the position of the face in the live view image as the position of the main subject. Then, the position where the image blur is calculated on the image plane 70 is set to the position corresponding to the main subject. The angle blur calculation unit 201 calculates the image blur at the position determined by the CPU 21, and performs the image blur correction based on this image blur.

For example, when the live view button that constitutes the operation member 29 is operated, the CPU 21 keeps the mirror 24 rotated to the up position, and causes the image sensor 22 to start acquiring a live view image.

Similarly to (2) above, the CPU 21 can also track the moving face (subject 80) by sequentially updating the position of the main subject based on each frame of the live view image. The angle blur calculation unit 201 performs image blur correction on the moving face (subject 80) when acquiring the live view image by sequentially calculating the image blur at the position sequentially updated by the CPU 21.

For example, the CPU 21 may select the third method and start the face recognition process when the imaging scene mode of the camera 1 is set to “portrait”.

<When there are multiple positions for calculating image blur>
In each of the methods (1) to (3), the case where only one position for calculating the image blur on the image plane 70 is determined is illustrated. However, as described below, there are cases where a plurality of positions are candidates for the position where the image blur is calculated. As a specific example, when a plurality of focus areas are selected in the above (1), or when a plurality of objects (subjects 80) are recognized in the above (2), or when a plurality of objects are recognized in the above (3). This is the case when a face is recognized. In such a case, the CPU 21 selects the method (4) or (5) below.

(4) Defining One Representative Position The fourth method is to calculate the image blur at one representative position. FIG. 6 is a diagram illustrating an example in which one representative position is determined from a plurality of candidates. For example, on the image plane 70, a position P-1 corresponding to the focus area 25P-1 in FIG. 5, a position P-2 corresponding to the focus area 25P-2, and a position P-4 corresponding to the focus area 25P-4. When the three points are the candidates, the CPU 21 determines the absolute value of the distance between the positions of the plurality of candidates and the X axis (FIG. 3) and the absolute value of the distance between the positions of the plurality of candidates and the Y axis (FIG. 3). The average position P is obtained based on the value and the position P is set as the representative position. Then, the position where the image blur is calculated on the image plane 70 is set to the representative position P. In this way, the representative position P is obtained by averaging the absolute values of the distances on the axis (X axis, Y axis) of the image plane 70.

The angle blur calculation unit 201 calculates an image blur at the representative position P and performs image blur correction based on this image blur.

In the above description of (4), the case where a plurality of focus areas are selected has been illustrated, but the same applies when a plurality of objects (subjects 80) are recognized and a plurality of faces are recognized. For example, the CPU 21 determines the representative position P as described above based on the positions of the recognized objects and the recognized positions of the faces. The angle blur calculation unit 201 calculates the image blur at the representative position P determined by the CPU 21, and performs the image blur correction based on this image blur.

(5) Obtaining one image blur The fifth method is to calculate one image blur based on a plurality of image blurs. Referring to the example of FIG. 6, for example, on the image plane 70, a position P-1 corresponding to the focus area 25P-1 in FIG. 5, a position P-2 corresponding to the focus area 25P-2, and a focus area 25P-4. The three points with the position P-4 corresponding to are candidates.

The CPU 21 sets a plurality of positions as positions on the image plane 70 where the image blur is calculated. The angle blur calculation unit 201 calculates the image blur at the position P-1, the position P-2, and the position P-4 on the image plane 70, respectively. The angle blur calculation unit 201 further calculates the average of the calculated plurality of image blurs, and performs the image blur correction based on the average value of the image blurs.
The average value of image blur is obtained by, for example, a simple average, but may be obtained by a weighted average.

In the above description of (5), the case where a plurality of focus areas are selected has been illustrated, but the same applies when a plurality of objects (subjects 80) are recognized or a plurality of faces are recognized. For example, the CPU 21 sets the positions of a plurality of recognized objects and the positions of a plurality of recognized faces as the positions on the image plane 70 where the image blur is calculated. The angle blur calculation unit 201 calculates the image blur for each position on the image plane 70. The angle blur calculation unit 201 further obtains an average of the calculated plurality of image blurs, and performs image blur correction based on the average value of the image blurs.
As a modification of (4), one subject may be selected from a plurality of subjects. For example, a subject with large image blur is selected from a plurality of subjects. Alternatively, a subject with a large image blur is selected from a plurality of subjects that are close to the camera 1. Alternatively, a subject having a high image height from the optical axis L1 of the interchangeable lens 3 is selected from a plurality of subjects.

The image blur correction in the first embodiment includes correction in the Y-axis direction when the camera 1 rotates in the Pitch direction and correction in the X-axis direction when the camera 1 rotates in the Yaw direction.
The above-described description of the first embodiment has been described on behalf of the correction in the Y-axis direction when the camera 1 rotates in the Pitch direction. When the camera 1 also rotates in the Yaw direction, the same correction as that described above is necessary for the X-axis direction. The correction in the Y-axis direction when the camera 1 rotates in the Pitch direction and the correction in the X-axis direction when the camera 1 rotates in the Yaw direction are the same except that the directions are different. The description of is omitted.

In the first embodiment, the image blur calculated by the translational blur calculation unit 202 is treated as substantially constant even if the position on the image plane 70 (the image plane of the image sensor 22) is different.
The outline of the first embodiment is as follows.
The angle blur calculation unit 201 sets the position where the image blur is calculated to any position on the image plane 70, and calculates the image blur.
The translational blur calculation unit 202 determines the position where the image blur is calculated, for example, at the center of the image plane 70, and calculates the image blur.
The shake correction optical system target position calculation unit 203 determines whether the image shake calculated by the angle shake calculation unit 201 and the image shake calculated by the translational shake calculation unit 202 are positive or negative depending on the directions of the X-axis and Y-axis directions. The sign is added and the addition operation is performed. Then, the image blur amount at the position of the image plane 70 is calculated based on the image blur in the X axis direction and the Y axis direction after the addition.

According to the first embodiment described above, the following operational effects can be obtained.
(1) The shake correction device of the camera 1 detects the shake amount of the image of the subject 80 formed on the image plane 70 by the imaging optical system based on the shake sensor 39 that detects the shake of the camera 1 and the output of the shake sensor 39. A shake correction unit 21a for calculation and a CPU 21 for determining a position on the image plane 70 are provided. The shake correction unit 21a calculates the image shake Δy2 in the Y-axis direction based on the position determined by the CPU 21 and the shake detected by the shake sensor 39, for example, in the Y-axis direction. Accordingly, even when the position of the image plane 70 determined by the CPU 21 is a position other than the center of the image plane 70 intersecting the optical axis L1, the image blur can be suppressed appropriately. In particular, it is suitable when the focal length f of the interchangeable lens 3 is short (or when the angle of view becomes wide due to the relationship between the size of the image sensor 22 and the focal length f).

(2) In the blur correction device of (1) above, the blur correction unit 21a calculates a larger blur amount as the distance from the axis in the X-axis direction intersecting the Y-axis direction to the determined position on the image plane 70 increases. Therefore, image blur can be appropriately suppressed even at a position where the image height is high.

(3) In the blur correction device of (2) above, the blur correction unit 21a calculates the blur amount based on the output of the shake sensor 39, the distance, and the focal length of the imaging optical system, so the focal length f is different. Even when the interchangeable lens 3 is replaced, the image blur can be appropriately suppressed.

(4) In the blur correction device of (1) to (3) above, the CPU 21 sets the position of the focus area on the image plane 70, which is the target of focus adjustment of the image pickup optical system, as the determined position, so that the main subject exists. Image blurring can be appropriately suppressed at a position where there is a high possibility that

(5) In the blur correction device of (1) to (3) above, the CPU 21 determines the determined position based on the contrast information of the subject image, so that the image is properly captured at a position where the main subject is likely to exist. Blur can be suppressed.

(6) In the blur correction device of (1) to (3) above, the CPU 21 determines the determined position based on the brightness value information of the image of the subject 80, so that the position where the main subject is likely to exist, Image blur can be suppressed appropriately.

(7) In the blur correction device of (1) to (3) above, the CPU 21 determines the determined position based on the subject recognition information based on the image of the subject 80, so that the position where the main subject is likely to exist is high. , It is possible to properly suppress the image blur.

(8) In the blur correction device of (1) to (3) above, the CPU 21 determines the determined position based on the face recognition information based on the image of the subject 80, so that the position where the main subject is likely to exist is high. , It is possible to properly suppress the image blur.

(9) In the blur correction device according to (4) to (8) above, the CPU 21 determines the determined position according to the set imaging scene mode, so that the image is appropriately captured at a position where the main subject is likely to be present. Blur can be suppressed.

(10) In the blur correction device according to any one of (1) to (3) above, the CPU 21 sets the position designated by the user operation on the image plane 70 as the determined position, so that the image blur is appropriately performed at the position desired by the user. Can be suppressed.

(11) In the blur correction device of (1) to (3) above, the CPU 21 sets the position corresponding to, for example, the subject 80 close to the camera 1 as the determined position based on the shooting distance information, and thus corresponds to the main subject. Image blur can be appropriately suppressed at the position where

(12) In the blur correction device of (1) to (3) above, the CPU 21 detects the amount of movement due to composition change based on the output of the shake sensor 39, and the CPU 21 moves after the determined position is determined by the CPU 21. When the amount is detected, the blur correction unit 21b calculates the blur amount based on the position where the determined position is changed based on the movement amount. As a result, it is possible to appropriately suppress the image blur at the position where the main subject is likely to be present after the composition is changed.

(13) In the blur correction device according to (4) above, when there are a plurality of focus areas that are the targets of focus adjustment of the image pickup optical system, the CPU 21 determines the axis of the image plane 70 based on the positions of the plurality of focus areas. Since the center of gravity (representative position P) of the absolute value of the distance on the X-axis and the Y-axis is set as the determined position, the image blurring is appropriately performed so that the image blurring at the positions of the plurality of focus areas becomes approximately the same. Can be suppressed.

(14) In the blur correction device according to (7) above, when there are a plurality of subjects according to the subject recognition information, the CPU 21 sets the axes of the image plane 70 (X axis, Y axis) based on the positions of the plurality of subjects. Since the center of gravity (representative position P) of the absolute value of the distance is set as the determined position, it is possible to appropriately suppress the image blur so that the image blurs at the positions of the plurality of subjects are approximately the same.

(15) In the blur correction device according to (8) above, when there are a plurality of faces according to the face recognition information, the CPU 21 sets the axes of the image plane 70 (X axis, Y axis) based on the positions of the plurality of faces. Since the center of gravity (representative position P) of the absolute value of the distance is the determined position, it is possible to appropriately suppress the image blur so that the image blurs at the positions of the plurality of faces are approximately the same.

(16) In the shake correction device according to (4), the CPU 21 sets the positions of the plurality of focus areas as the determined positions when there are a plurality of focus areas that are targets of focus adjustment of the imaging optical system, and sets the shake correction unit. 21b calculates an average value of a plurality of blur amounts calculated based on a plurality of determined positions. Accordingly, the image blur can be appropriately suppressed so that the image blurs at the positions of the plurality of focus areas are substantially the same.

(17) In the blur correction device according to (7) above, when there are a plurality of main subjects according to the subject recognition information, the CPU 21 sets the positions of the plurality of main subjects as the determined positions, and the blur correction unit 21b makes a plurality of determinations. An average value of a plurality of blur amounts calculated based on the position is calculated. Accordingly, the image blur can be appropriately suppressed so that the image blurs at the positions of the plurality of focus areas are substantially the same.

(18) In the blur correction device according to (8), when the plurality of faces are present according to the face recognition information, the CPU 21 sets the positions of the plurality of faces as the determined positions, and the blur correction unit 21b sets the plurality of determined positions. The average value of the plurality of shake amounts calculated based on the above is calculated. Accordingly, the image blur can be appropriately suppressed so that the image blurs at the positions of the plurality of focus areas are substantially the same.

The following modifications are also within the scope of the invention, and it is possible to combine one or more of the modifications with the above-described embodiments or the embodiments described later.
(Modification 1)
In the first embodiment, the image blur correction performed by the camera 1 by operating the blur correction driving mechanism 37 of the interchangeable lens 3 has been described as an example. Instead, in the first modification of the first embodiment, the camera 1 operates the shake correction drive mechanism 26 of the camera body 2 to perform the image shake correction. The image blur correction according to the modified example 1 of the first embodiment can also be performed in the same manner as in the first embodiment, and the same effect as that of the first embodiment can be obtained.

(Modification 2)
In the third method of the above (3) described in the first embodiment, that is, in the case of calculating the image blur at the position of the face (subject 80) to be reflected, for example, when the face is greatly enlarged on the screen. The CPU 21 may select the fifth method (5) above.

FIG. 7 is a diagram illustrating a second modification of the first embodiment. An example in which one representative position is determined from a plurality of candidates will be described with reference to FIG. 7. According to FIG. 7, the face (subject) is largely reflected on the image plane 70. On the image plane 70, the CPU 21 sets, for example, two positions, that is, the position Pa at the left end and the position Pb at the right end of the detected face as candidate positions.

The CPU 21 sets the above-mentioned two candidate positions as the positions on the image plane 70 where the image blur is calculated. The angle shake calculation unit 201 calculates the image shake at each of the position Pa and the position Pb on the image plane 70. The angle blur calculation unit 201 further obtains an average of the calculated plurality of image blurs, and performs image blur correction based on the average value of the image blurs.
The average value of image blur is obtained by, for example, a simple average, but may be obtained by a weighted average.

According to the second modification of the first embodiment described above, when the face is large, it is possible to perform the image blur correction so that the image blurs at both ends of the face are similar. As a result, it is possible to suppress the sense of discomfort seen by the user, as compared with the case where the size of the image blur is different between the left and right faces.

(Second embodiment)
In the second embodiment, image blurring in a direction (a different direction) intersecting the detected angular velocity direction will be described.
The camera 1 may be a single-lens reflex type camera illustrated in FIG. 1 or a mirrorless type without the mirror 24.
Further, the camera 1 may be configured as a lens integrated type in which the interchangeable lens 3 and the camera body 2 are integrated.
Furthermore, the image pickup apparatus is not limited to the camera 1, and may be a lens barrel having an image pickup sensor, a smartphone having an image pickup function, or the like.

FIG. 8 is a schematic diagram for explaining the detection direction of the angular velocity by the angular velocity sensor 39a and the image blur on the image plane 70 (the image plane of the image sensor 22). In FIG. 8, the intersection of the image plane 70 and the optical axis L1 of the interchangeable lens 3 is the origin of the coordinates, the optical axis L1 of the interchangeable lens 3 is the Z axis, and the image plane 70 is the XY plane. According to FIG. 8, the optical axis L1 intersects the center of the imaging surface. The interchangeable lens 3 and the subject 80 are located in the Z axis plus direction with respect to the image plane 70. The angular velocity sensor 39a detects, for example, a rotation angle θ around an axis (small-x axis) parallel to the X axis (Pitch direction). When the subject 80 is far away, the symbol f in FIGS. 3 and 4 indicates the focal length.

When the camera 1 shakes, the image of the subject 80 located at the coordinates (xp,yp) on the image plane 70 before the shake moves after the shake in the negative Y-axis direction and the positive X-axis direction. Therefore, the coordinates of the image of the subject 80 are (xp+Δx2,yp-Δy2).

The mathematical expression representing the image blur Δy2 in the Y-axis direction is the above Expression (1), as in the case described in the first embodiment.
On the other hand, when the image blur Δx2 in the X-axis direction is expressed by a mathematical expression, the following expression (3) is obtained.
Δx2=f×xp/[(f ² +yp ² ) ^1/2 ×cos(θ+tan ⁻¹ (yp/f))]−xp (3)
However, the rotation angle in the Pitch direction (representing the camera shake angle, which is generally about 0.5 degrees) is θ. When the subject 80 is far away, the symbol f in FIGS. 3 and 4 represents the focal length of the interchangeable lens 3.

According to the above equations (1) and (3), when the focal length f is sufficiently larger than yp, the rotation angle θ (camera shake angle) is generally about 0.5 degrees, so it is considered that Δx2≈0. be able to. That is, whether the position of the image of the subject 80 on the image plane 70 is at the center (the origin in this example) of the image plane 70 or at a position away from the center, in other words, the distance from the optical axis L1 is different. However, the image blur when the rotation angle θ is detected in the Pitch direction only needs to be considered in the Y axis direction, and can be ignored in the X axis direction. Therefore, for example, when image blur correction is performed in the Y-axis direction based on the image blur calculated at the center of the image plane 70, the image of the subject 80 located at the center of the image plane 70 is also separated from the center of the image plane 70. Image blurring can be suppressed for any image of the subject 80 at different positions.

However, when the interchangeable lens 3 is a wide-angle lens and the focal length f cannot be said to be sufficiently larger than yp, Δx2≠0 according to the above equation (3). Therefore, when the rotation angle θ in the Pitch direction is detected, not only the image shake in the Y-axis direction can be calculated by the above formula (1), but also the image shake in the X-axis direction can be calculated by the above formula (3). You will need it. Otherwise, the image blur in the X-axis direction corresponding to the image blur Δx2 according to the above equation (3) cannot be suppressed and remains. The image blur Δx2 becomes larger as the position where the image blur is calculated approaches the periphery of the image plane 70, that is, as the image height becomes higher.

The CPU 21 determines the position where the image blur is calculated on the image plane 70, as in the first embodiment. That is, the CPU 21 selects one of the methods (1) to (4) and determines the position on the image plane 70 where the image blur is calculated. Then, the angle blur calculation unit 201 calculates the image blur at the position determined by the CPU 21. The blur correction optical system target position calculation unit 203 calculates an image blur amount based on the image blur calculated by the angle blur calculation unit 201 and the image blur calculated by the translational blur calculation unit 202.

The image blur correction in the second embodiment includes correction in the Y-axis direction when the camera 1 rotates in the Pitch direction and correction in the X-axis direction when the camera 1 rotates in the Yaw direction.
In the description of the second embodiment described above, in the case where the focal length f is not sufficiently larger than yp when performing the correction in the Y-axis direction when the camera 1 rotates in the Pitch direction, The point is that correction is also performed in the X-axis direction.
When the camera 1 rotates in the Yaw direction, the same correction as that described above is necessary for the Y-axis direction. That is, although not described with reference to the drawings, when the focal length f is not sufficiently larger than xp when performing correction in the X-axis direction when the camera 1 rotates in the Yaw direction, Also corrects in the Y-axis direction.
Further, when the camera 1 rotates in the Pitch direction and the Yaw direction, image blurring on the X axis and the Y axis due to both rotational movements occurs at the same time. Positive and negative signs are added to the directions of the axes, and the addition operation is performed. Then, based on the image blur after addition, correction is made in the X-axis and Y-axis directions.

Also in the second embodiment, as in the first embodiment, the position of the image blur calculated by the translational blur calculation unit 202 on the image plane 70 (the imaging plane of the image sensor 22) is different. Is also treated as almost constant.
The outline of the second embodiment is as follows.
The angle blur calculation unit 201 sets the position where the image blur is calculated to any position on the image plane 70, and calculates the image blur. At this time, for example, when the rotation angle θ in the Pitch direction is detected, not only the image blur in the Y axis direction is calculated by the above formula (1), but also the image blur in the X axis direction is calculated by the above formula (3). ..
The translational blur calculation unit 202 determines the position where the image blur is calculated, for example, at the center of the image plane 70, and calculates the image blur.
The shake correction optical system target position calculation unit 203 determines whether the image shake calculated by the angle shake calculation unit 201 and the image shake calculated by the translational shake calculation unit 202 are positive or negative depending on the directions of the X-axis and Y-axis directions. The sign is added and the addition operation is performed. Then, the image blur amount at the position of the image plane 70 is calculated based on the image blur in the X axis direction and the Y axis direction after the addition.

According to the second embodiment described above, the following operational effects can be obtained.
(1) The shake correction device of the camera 1 detects the shake of the device in the Y-axis direction, and an image of the subject 80 formed on the image plane 70 by the imaging optical system based on the output of the shake sensor 39. And a shake correction unit 21a that calculates the shake amount of The blur correction unit 21a calculates the image blur in the X-axis direction that intersects the Y-axis direction. As a result, it is possible to suppress image blur in the direction of the X axis that intersects the Y axis in which the shake is detected.

(2) In the blur correction device of the above (1), the blur correction unit 21a calculates the image blur in the Y-axis direction, so it is possible to suppress the image blur in the Y-axis direction in which the shake is detected.

(3) The blur correction device according to (1) or (2) further includes a CPU 21 that determines the position on the image plane 70. The blur correction unit 21a calculates the image blur amount in the X-axis direction and the Y-axis direction based on the position determined by the CPU 21 and the rotation angle in the Y-axis direction detected by the shake sensor 39. Accordingly, even when the position of the image plane 70 determined by the CPU 21 is a position other than the center of the image plane 70, the image blur can be appropriately suppressed. In particular, it is suitable when the focal length f of the interchangeable lens 3 is short (or when the angle of view becomes wide due to the relationship between the size of the image sensor 22 and the focal length f).

The following modifications are also within the scope of the invention, and it is possible to combine one or more of the modifications with the above-described embodiments or the embodiments described later.
(Modification 3)
In the image blur correction described in the second embodiment, the CPU 21 performs the correction in consideration of the optical distortion caused by the interchangeable lens 3. FIG. 9 is a diagram illustrating an example in which distortion (for example, barrel type) is generated by the interchangeable lens 3. A large number of solid circles represent an image of the subject 80, assuming that the interchangeable lens 3 has no distortion. On the other hand, a large number of hatched circles show an image of the subject 80 which is distorted by the influence of barrel distortion aberration based on the optical characteristics of the interchangeable lens 3.

Generally, the distortion aberration of the interchangeable lens 3 varies depending on the design, but is large in many wide-angle lenses having a short focal length. Therefore, as illustrated in FIG. 9, the amount of distortion increases as the distance from the optical axis L1 of the imaging optical system increases (the distance from the center O of the image surface 70 increases when the center O of the image surface 70 is aligned with the optical axis L1). growing. The amount of strain appears as a positional deviation between the solid circle and the hatched circle shown in FIG. In the example of FIG. 9, the position shift between the solid circle and the hatched circle is the largest at a position where the distance from the center O of the image plane 70 is long (in other words, the image height is high), for example, at the lower right position. The positional deviation is Δx in the X-axis direction and Δy in the Y-axis direction.

The schematic diagram illustrated in FIG. 8 is shown as having no distortion due to the imaging optical system, like the solid circle in FIG. Therefore, for example, when the position where the image blur is calculated on the image plane 70 is set to a position away from the center O of the image plane 70, if the image blur correction described in the second embodiment is performed as it is, distortion exists. If so, an image blur that cannot be completely corrected occurs.

Therefore, in Modification 3 of the second embodiment, when the image blur correction described in the second embodiment is performed with the interchangeable lens 3 having large distortion aberration attached to the camera body 2, Image blur correction is performed on the assumption that the image pickup optical system has distortion such as a hatched circle in 9.

Like the hatched circles in FIG. 9, distortion information indicating which position, direction, and amount of distortion on the image plane 70 is known as design information of the interchangeable lens 3. .. Therefore, information on the distortion of the interchangeable lens 3 mounted on the camera body 2 is recorded in the memory 28 in advance. When the CPU 21 detects that the interchangeable lens 3 having a large distortion is attached, the CPU 21 reads the corresponding information on the distortion from the memory 28 and uses it for the calculation for calculating the image blur described above.

The shake correction optical system target position calculation unit 203 of the shake correction unit 21a, for each of the X-axis and the Y-axis, the image shake calculated by the angle shake calculation unit 201, the image shake calculated by the translational shake calculation unit 202, Also, depending on the direction of the information on the distortion aberration read from the memory 28, positive and negative signs are added to perform the addition operation. Then, the image blur amount at the position of the image plane 70 is calculated based on the image blur in the X axis direction and the Y axis direction after the addition.

In the above description, an example in which barrel distortion occurs is described, but the same applies to the case where pincushion distortion occurs.

According to the modified example 3 of the second embodiment described above, it is possible to appropriately correct the image blur even if there is distortion.
Further, even when the optical distortion (Distortion) generated by the interchangeable lens 3 is large, the image blur can be appropriately suppressed at a position other than the center of the image plane 70.

(Third Embodiment)
In the third embodiment, the interchangeable lens 3A is attached to the camera body 2A. The interchangeable lens 3A is different from the interchangeable lens 3 in that a shake correction unit 40 is added. The detection signal from the shake sensor 39 is sent to the shake correction unit 40.
The camera body 2A is different from the camera body 2 in that a shake sensor (motion detecting unit, shake detecting unit) 31 is added. The detection signal from the shake sensor 31 is sent to the CPU 21 (shake correction unit 21a). The shake sensor 31 has the same function as the shake sensor 39.

In the third embodiment, when the interchangeable lens 3A including the blur correction drive mechanism 37 is attached to the camera body 2A, the image blur correction performed by operating the blur correction drive mechanism 37 of the interchangeable lens 3A and the camera This is also used in combination with image blur correction performed by operating the blur correction drive mechanism 26 of the body 2A.
On the other hand, when the interchangeable lens 3A that does not include the shake correction drive mechanism 37 is attached to the camera body 2A, the shake correction drive mechanism 26 of the camera body 2A is actuated to modify the modification of the first embodiment. Image blur correction similar to 1 is performed.

FIG. 10 is a diagram showing a main configuration of a camera 1A according to the third embodiment. The camera 1A includes a camera body 2A and an interchangeable lens 3A. The interchangeable lens 3A is attached to the camera body 2A via a mount portion (not shown). When the interchangeable lens 3A is attached to the camera body 2A, the camera body 2A and the interchangeable lens 3A are electrically connected, and the camera body 2A and the interchangeable lens 3A can communicate with each other. Communication between the camera body 2A and the interchangeable lens 3A may be performed by wireless communication.
10, the same components as those in FIG. 1 are designated by the same reference numerals as those in FIG. 1 and their description is omitted.

FIG. 11 is a diagram illustrating the blur correction unit 40 of the interchangeable lens 3A. The blur correction unit 40 includes an angle blur calculation unit 401, a translation blur calculation unit 402, and a blur correction optical system target position calculation unit 403.
The angle blur calculation unit 401 uses the detection signal around the axis (Pitch direction) parallel to the X axis by the angular velocity sensor 39a to detect the image blur in the Y axis direction due to the rotational motion and, if necessary, the image in the X axis direction. Calculate blurring. Further, the angle blur calculation unit 201 uses the detection signal around the axis parallel to the Y axis (Yaw direction) by the angular velocity sensor 39a to detect the image blur in the X axis direction due to the rotational movement and, if necessary, the Y axis direction. And the image blur of.

The translational blur calculation unit 402 calculates the image blur in the X-axis direction due to the translational motion by using the detection signal of the acceleration sensor 39b in the X-axis direction. Further, the translational blur calculation unit 402 calculates the image blur in the Y-axis direction due to the translational motion, using the detection signal in the Y-axis direction from the acceleration sensor 39b.

The blur correction optical system target position calculation unit 403 calculates the image blur in the X-axis direction and the Y-axis direction calculated by the angle blur calculation unit 401 and the image in the X-axis direction and the Y-axis direction calculated by the translation blur calculation unit 402. Image blurring in the X-axis direction and the image blurring in the Y-axis direction is calculated by adding the blurring.

Further, the blur correction optical system target position calculation unit 403 calculates the image blur in the X-axis direction and the Y-axis direction after the addition, the photographing magnification (calculated based on the position of the zoom optical system 31), and the subject from the camera 1A. Based on the distance to 80 (calculated based on the position of the focus optical system 32), the image blur amount at the position of the image plane 70 described below is calculated.

The shake correction optical system target position calculation unit 403 calculates the target position of the shake correction optical system 33 based on the calculated image shake amount in order to operate the shake correction drive mechanism 37 of the interchangeable lens 3A.
Then, the shake correction optical system target position calculation unit 403 sends a signal indicating the target position to the shake correction drive mechanism 37 of the interchangeable lens 3A.

The camera 1A may be a single-lens reflex type illustrated in FIG. 10 or a mirrorless type without the mirror 24.
Further, as long as it includes a shake correction drive mechanism 26 for moving the image pickup device 22 forward and backward and a shake correction drive mechanism 37 for moving the shake correction optical system 33 forward and backward, the interchangeable lens 3A and the camera body 2A are integrated. It may be configured as a lens-integrated camera.

<Image blur correction used together>
Image blur correction that uses both the image blur correction by the interchangeable lens 3A and the image blur correction by the camera body 2A will be described below.
The image blur calculation by the angle blur calculation unit 201 and the image blur calculation by the translational blur calculation unit 202 are the same as those in the first and second embodiments.
However, it differs from the first and second embodiments in the following points. One of the differences is that the center of the image plane 70 is selected as the position for calculating the image blur in the image blur correction by the interchangeable lens 3A, and the position on the image plane 70 is calculated as the position for the image blur in the image blur correction by the camera body 2A. The point is to choose the position.
Another difference is that the image blur correction by the interchangeable lens 3A and the image blur correction by the camera body 2A are performed based on the sharing ratio determined by the CPU 21 of the camera body 2A. The explanation of the sharing ratio will be described later.

<Position for calculating image blur>
The CPU 21 sets the position where the blur correction unit 40 of the interchangeable lens 3A calculates the image blur, for example, at the center of the image plane 70, and the position where the blur correction unit 21a of the camera body 2A calculates the image blur is on the image plane 70. Set in either position. As a result, the angle blur calculation unit 401 of the interchangeable lens 3A calculates the blur correction amount (L) based on the image blur at the center position of the image surface 70 and the share ratio of the interchangeable lens 3A determined by the CPU 21. .. The angle blur calculation unit 201 of the camera body 2A determines the amount of blur correction (B) based on the image blur at a position different from the center of the image plane 70 determined by the CPU 21 and the share ratio of the camera body 2A determined by the CPU 21. ) Is calculated.
When determining the position for calculating the image blur at a position different from the center of the image plane 70, the CPU 21 determines the position by any of the methods (1) to (4) in the first embodiment.

When the position where the image blur is calculated is the center of the image plane 70, the mathematical expression representing the image blur Δy1 in the Y-axis direction is the above equation (2), as described in the first embodiment.
Further, when the position where the image blur is calculated is different from the center of the image plane 70, the mathematical expression representing the image blur Δy2 in the Y-axis direction is the above formula (1) as described in the first embodiment. is there.

<Share ratio>
The CPU 21 determines a share ratio between the image blur correction by the interchangeable lens 3A and the image blur correction by the camera body 2A. The CPU 21 of this example sets the sharing ratio to 50:50, for example. This ratio may be 70:30 or 40:60.

When the sharing ratio determined by the CPU 21 is 50:50, the angle shake calculation unit 401 of the interchangeable lens 3A obtains the image shake V(L) to be shared by the interchangeable lens 3A as shown in the following equation (4). The reason for halving on the right side is that the sharing ratio is set to 50%.
V(L)=Δy1/2
=f×tan θ/2 (4)
However, Δy1 is the image blur in the Y-axis direction at the center of the image plane 70. Further, the rotation angle in the Pitch direction (representing the camera shake angle, which is generally about 0.5 degrees) is θ. When the subject 80 is far away, the symbol f represents the focal length of the interchangeable lens 3A.

On the other hand, when the sharing ratio determined by the CPU 21 is 50:50, the angle shake calculation unit 201 of the camera body 2A calculates the image shake V(B) to be shared by the camera body 2A as shown in the following equation (5). Ask.
V(B)=Δy1/2+d
=f×tan θ/2+d (5)
However, d=Δy2−Δy1. Δy2 is an image blur in the Y-axis direction at a position different from the center of the image plane 70.

The shake correction optical system target position calculation unit 403 of the interchangeable lens 3A, based on the image shake V(L) calculated by the angle shake calculation unit 401 and the image shake calculated by the translation shake calculation unit 402, the interchangeable lens 3A. The target position of the blur correction optical system 33 in the image blur correction performed by operating the blur correction driving mechanism 37 is calculated.

Further, the shake correction optical system target position calculation unit 203 of the camera body 2A uses the camera shake based on the image shake V(B) calculated by the angle shake calculation unit 201 and the image shake calculated by the translation shake calculation unit 202. A target position of the image sensor 22 is calculated in image blur correction performed by operating the blur correction drive mechanism 26 of the body 2A.
The shake correction optical system target position calculation unit 403 of the interchangeable lens 3A further sends a signal indicating the target position to the shake correction drive mechanism 37 of the interchangeable lens 3A. Further, the shake correction optical system target position calculation unit 203 of the camera body 2A further sends a signal indicating the target position to the shake correction drive mechanism 26 of the camera body 2A.

In the third embodiment, the image blur correction based on the image blur calculated at the center position of the image plane 70 by the angular blur calculation unit 401 is performed by the image blur correction by the interchangeable lens 3A. Further, the image blur correction based on the image blur calculated by the angle blur calculation unit 201 at a position different from the center of the image plane 70 is performed by the image blur correction by the camera body 2A.

The image blur correction in the third embodiment includes correction in the Y-axis direction when the camera 1A rotates in the Pitch direction and correction in the X-axis direction when the camera 1A rotates in the Yaw direction.
The above description of the third embodiment has been described on behalf of the correction in the Y-axis direction when the camera 1A rotates in the Pitch direction. Therefore, when the camera 1A also rotates in the Yaw direction, the same correction as the above-mentioned correction is necessary in the X-axis direction.
The correction in the Y-axis direction when the camera 1A rotates in the Pitch direction and the correction in the X-axis direction when the camera 1A rotates in the Yaw direction are the same except that the directions are different. Will be omitted.

Further, when the camera 1A rotates in the Pitch direction and the Yaw direction, image blurring on the X axis and the Y axis occurs simultaneously due to both rotational movements. Positive and negative signs are added to the directions of the axes, and the addition operation is performed. Then, based on the image blur after addition, correction is made in the X-axis and Y-axis directions.

In the third embodiment, the image blur calculated by the translation blur calculation unit 202 and the translation blur calculation unit 402 in the image plane 70 is the same as in the first and second embodiments. Even if the position is different, it is treated as almost constant.
The outline of the third embodiment is as follows.
The angle blur calculation unit 401 of the blur correction unit 40 of the interchangeable lens 3A calculates the image blur at the center position of the image plane 70. The angle blur calculation unit 201 of the blur correction unit 21a of the camera body 2A calculates the image blur at a position different from the center of the image plane 70.
The angle shake calculation unit 401 of the interchangeable lens 3A sets the image shake V(L) to be shared by the interchangeable lens 3A (for example, a share ratio of 50%) to 1/2 of the image shake Δy1 at the center of the image plane 70, and sets the camera body 2A. The angle blur calculation unit 201 of (1) sets the image blur V(B) shared by the camera body 2A as V(L)+d. d is a difference between the image blur Δy2 at a position different from the center of the image plane 70 and the Δy1.
The translational shake calculation unit 402 of the interchangeable lens 3A sets the image shake to be shared by the interchangeable lens 3A (for example, a share ratio of 50%) to 1/2 of the image shake at the center of the image plane 70, for example. The translational blur calculation unit 202 of the camera body 2A sets the image blur shared by the camera body 2A to, for example, 1/2 of the image blur at the center of the image plane 70.
The shake correction optical system target position calculation unit 403 of the interchangeable lens 3A uses the image shake V(L) calculated by the angle shake calculation unit 401 and the image shake calculated by the translational shake calculation unit 402 as X-axis and Y-axis, respectively. The positive and negative signs are added according to the direction of each axis, and the addition operation is performed. Then, the image blur amount at the center position of the image plane 70 is calculated based on the image blur in the X axis direction and the Y axis direction after the addition.
The shake correction optical system target position calculation unit 203 of the camera body 2A calculates the image shake V(B) calculated by the angle shake calculation unit 201 and the image shake calculated by the translation shake calculation unit 202, respectively, on the X-axis and the Y-axis. The positive and negative signs are added according to the direction of each axis of and the addition operation is performed. Then, based on the image blur in the X-axis direction and the Y-axis direction after the addition, the image blur amount at a position different from the center of the image plane 70 is calculated.

According to the third embodiment described above, the following operational effects can be obtained.
(1) The shake correction device of the camera 1A calculates the shake amount of the image of the subject 80 formed on the image plane 70 by the imaging optical system based on the shake sensor 39 that detects shake of the device and the output of the shake sensor 39. The interchangeable lens 3A is provided with a shake correction unit 40 that performs a shake correction operation, and a shake correction drive mechanism 37 that moves the shake correction optical system 33 in a direction that suppresses the shake amount based on the output of the shake correction unit 40. Further, a shake sensor 31 that detects shake of the apparatus, a shake correction unit 21b that calculates a shake amount of an image of a subject 80 formed on the image plane 70 by the imaging optical system based on an output of the shake sensor 31, and a shake correction Based on the output of the unit 21a, an image sensor 22 that captures an image of the subject 80 on the image plane 70 is moved by a blur correction drive mechanism 26 that moves in a direction to reduce the amount of blur, and a CPU 21 that determines the position on the image plane 70. Prepare for the camera body 2A.

The blur correction unit 40 of the interchangeable lens 3A calculates an image blur Δy1 based on a first position (center of the image plane 70) predetermined on the image plane 70 and the blur detected by the blur sensor 39. The blur correction unit 40 sets the image blur V(L) to be shared by the interchangeable lens 3A (for example, a shared ratio of 50%) to 1/2 of the image blur Δy1.
The shake correction unit 21b of the camera body 2A has an image shake Δy2 based on the second position (a position different from the center) determined by the CPU 21 and the shake detected by the shake sensor 31, and a predetermined image surface 70. An image blur Δy1 is calculated based on one position (the center of the image plane 70) and the shake detected by the shake sensor 31. The blur correction unit 21b further calculates a difference d between the image blur Δy2 and the image blur Δy1. The angle blur calculation unit 201 sets the image blur V(B) shared by the camera body 2A as V(L)+d.
As a result, even when the position determined by the CPU 21 is outside the center of the image plane 70, image blur can be suppressed appropriately. In particular, it is suitable when the focal length f of the interchangeable lens 3A is short (or when the angle of view becomes wide due to the relationship between the size of the image sensor 22 and the focal length f).

(2) In the blur correction device of (1) above, the blur correction unit 40 of the interchangeable lens 3A outputs 50% of the image blur Δy1 to the blur correction drive mechanism 37, and the blur correction unit 21a of the camera body 2A The remaining 50% of the image blur Δy1 and the difference d are output to the correction drive mechanism 26. Compared with the case where the shake correction drive mechanism 26 and the shake correction drive mechanism 37 are not used together, the movement distances of the shake correction drive mechanism 26 and the shake correction drive mechanism 37 can be suppressed to be small, respectively.

The share ratio determined by the CPU 21 may be 100% for image blur correction by the interchangeable lens 3A and 0% for image blur correction by the camera body 2A. In this case, the angle blur calculation unit 401 of the interchangeable lens 3A sets the image blur V(L) shared by the interchangeable lens 3A to 100%, and the angle blur calculation unit 201 of the camera body 2A shares the image shared by the camera body 2A. The blurring V(B) is d. d is the difference between the image blur Δy2 at a position different from the center of the image plane 70 and the image blur Δy1 at the center of the image plane 70.

The following modifications are also within the scope of the invention, and it is possible to combine one or more of the modifications with the above-described embodiments or the embodiments described later.
(Modification 4)
In the modification 4 of the third embodiment, the CPU 21 determines, for example, two positions (referred to as a first position and a second position) on the image plane 70 as positions for calculating the image blur. The angle blur calculation unit 401 of the interchangeable lens 3A calculates the image blur at the first position determined by the CPU 21. The angle blur calculation unit 201 of the camera body 2A calculates the image blur at the first position and the second position determined by the CPU 21. The CPU 21 determines the first position and the second position for calculating the image blur by any one of the methods (1) to (4) in the first embodiment.

Modification 4 of the third embodiment is different from the third embodiment in that it includes a case where the first position and the second position are both different from the center of the image plane 70. On the other hand, in the fourth modification of the third embodiment, the CPU 21 determines the sharing ratio between the image blur correction by the interchangeable lens 3A and the image blur correction by the camera body 2A, as in the third embodiment. Is.

When the first position or the second position for calculating the image blur is the center of the image plane 70, the mathematical expression expressing the image blur Δy1 in the Y-axis direction is the same as the equation (2) as described in the first embodiment. ).
Further, when the first position and the second position for calculating the image blur are different from the center of the image plane 70, the mathematical expression representing the image blur Δy2 in the Y-axis direction is as described in the first embodiment. It is the above formula (1).

When the sharing ratio determined by the CPU 21 is, for example, 50:50, the angle shake calculation unit 401 of the interchangeable lens 3A calculates the image shake V(L) to be shared by the interchangeable lens 3A as shown in the following equation (6). Ask. The reason for halving on the right side is that the sharing ratio is set to 50%.
V(L)=Δy2a/2 (6)
However, Δy2a is the image blur in the Y-axis direction at the first position different from the center of the image plane 70.

Further, when the sharing ratio determined by the CPU 21 is 50:50, the angle shake calculation unit 201 of the camera body 2A calculates the image shake V(B) to be shared by the camera body 2A as shown in the following equation (7). Ask.
V(B)=Δy2a/2+d2 (7)
However, d2=Δy2b−Δy2a. Δy2b is the image blur in the Y-axis direction at the second position different from the center of the image plane 70.

The shake correction optical system target position calculation unit 403 of the interchangeable lens 3A, based on the image shake V(L) calculated by the angle shake calculation unit 401 and the image shake calculated by the translation shake calculation unit 402, the interchangeable lens 3A. The target position of the blur correction optical system 33 in the image blur correction performed by operating the blur correction driving mechanism 37 is calculated.

Further, the shake correction optical system target position calculation unit 203 of the camera body 2A uses the camera shake based on the image shake V(B) calculated by the angle shake calculation unit 201 and the image shake calculated by the translation shake calculation unit 202. A target position of the image sensor 22 is calculated in image blur correction performed by operating the blur correction drive mechanism 26 of the body 2A.
The shake correction optical system target position calculation unit 403 of the interchangeable lens 3A further sends a signal indicating the target position to the shake correction drive mechanism 37 of the interchangeable lens 3A. Further, the shake correction optical system target position calculation unit 203 of the camera body 2A further sends a signal indicating the target position to the shake correction drive mechanism 26 of the camera body 2A.

In the fourth modification of the third embodiment, the image blur correction based on the image blur calculated by the angle blur calculation unit 401 at the first position of the image plane 70 is performed by the image blur correction by the interchangeable lens 3A. Further, the image blur correction by the camera body 2A performs the image blur correction based on the image blur calculated by the angle blur calculation unit 201 at the second position of the image plane 70.

The image blur correction in the modification 4 of the third embodiment is performed in the Y-axis direction when the camera 1A rotates in the Pitch direction and in the X-axis direction when the camera 1A rotates in the Yaw direction. Including and
The description of the fourth modification of the third embodiment described above is representative of the correction in the Y-axis direction when the camera 1A rotates in the Pitch direction. Therefore, when the camera 1A also rotates in the Yaw direction, the same correction as the above-mentioned correction is necessary in the X-axis direction.
The correction in the Y-axis direction when the camera 1A rotates in the Pitch direction and the correction in the X-axis direction when the camera 1A rotates in the Yaw direction are the same except that the directions are different. Will be omitted.

Further, when the camera 1A rotates in the Pitch direction and the Yaw direction, image blurring on the X axis and the Y axis occurs simultaneously due to both rotational movements. Positive and negative signs are added to the directions of the axes, and the addition operation is performed. Then, based on the image blur after addition, correction is made in the X-axis and Y-axis directions.

Further, in the modified example 4 of the third embodiment, the image blur calculated by the translation blur calculation unit 202 and the translation blur calculation unit 402 is the same as in the first to third embodiments. Even if the position on the image plane 70 (the image pickup plane of the image pickup device 22) is different, it is treated as substantially constant.
The outline of the modified example 4 of the third embodiment is as follows.
The angle blur calculation unit 401 of the blur correction unit 40 of the interchangeable lens 3A calculates the image blur at the first position on the image plane 70. The angle blur calculation unit 201 of the blur correction unit 21a of the camera body 2A calculates the image blur at the second position on the image plane 70.
The angle blur calculation unit 401 of the interchangeable lens 3A sets the image blur V(L) to be shared by the interchangeable lens 3A (for example, a share ratio of 50%) to 1/2 of the image blur Δy2a at the first position of the image plane 70, and the camera The angle shake calculation unit 201 of the body 2A sets the image shake V(B) shared by the camera body 2A as V(L)+d2. d2 is the difference between the image blur Δy2b at the second position on the image plane 70 and Δy2a.
The translational shake calculation unit 402 of the interchangeable lens 3A sets the image shake to be shared by the interchangeable lens 3A (for example, a share ratio of 50%) to 1/2 of the image shake at the center of the image plane 70, for example. The translational blur calculation unit 202 of the camera body 2A sets the image blur shared by the camera body 2A to, for example, 1/2 of the image blur at the center of the image plane 70.
The shake correction optical system target position calculation unit 403 of the interchangeable lens 3A uses the image shake V(L) calculated by the angle shake calculation unit 401 and the image shake calculated by the translational shake calculation unit 402 as X-axis and Y-axis, respectively. The positive and negative signs are added according to the direction of each axis, and the addition operation is performed. Then, the image blur amount at the first position of the image plane 70 is calculated based on the image blur in the X axis direction and the Y axis direction after the addition.
The shake correction optical system target position calculation unit 203 of the camera body 2A calculates the image shake V(B) calculated by the angle shake calculation unit 201 and the image shake calculated by the translation shake calculation unit 202, respectively, on the X-axis and the Y-axis. The positive and negative signs are added according to the direction of each axis, and the addition operation is performed. Then, the image blur amount at the second position of the image plane 70 is calculated based on the image blur in the X axis direction and the Y axis direction after the addition.

According to the modified example 4 of the third embodiment described above, the following operational effects can be obtained.
(1) The shake correction device of the camera 1A calculates the shake amount of the image of the subject 80 formed on the image plane 70 by the imaging optical system based on the shake sensor 39 that detects shake of the device and the output of the shake sensor 39. The interchangeable lens 3A is provided with a shake correction unit 40 that performs a shake correction operation, and a shake correction drive mechanism 37 that moves the shake correction optical system 33 in a direction that suppresses the shake amount based on the output of the shake correction unit 40.
Further, a shake sensor 31 that detects shake of the apparatus, a shake correction unit 21a that calculates a shake amount of an image of a subject 80 formed on the image plane 70 by the imaging optical system based on an output of the shake sensor 31, and a shake correction A shake correction drive mechanism 26 that moves the image sensor 22 that captures an image of the subject 80 on the image surface 70 based on the output of the unit 21a, and a first position and a second position on the image surface 70. The camera body 2A is provided with a CPU 21 for determining

The shake correction unit 40 of the interchangeable lens 3A calculates the image shake Δy2a based on the first position and the shake detected by the shake sensor 39. The blur correction unit 40 sets the image blur V(L) to be shared by the interchangeable lens 3A (for example, a shared ratio of 50%) to 1/2 of the image blur Δy2a.
The shake correction unit 21a of the camera body 2A determines an image shake Δy2a based on the first position and the shake detected by the shake sensor 31, and an image shake Δy2b based on the second position and the shake detected by the shake sensor 31. Calculate The blur correction unit 21b further calculates a difference d2 between the image blur Δy2a and the image blur Δy2b. The angle blur calculation unit 201 sets the image blur V(B) shared by the camera body 2A as V(L)+d2.
As a result, the image blur can be properly suppressed at the second position determined by the CPU 21 other than the center of the image plane 70. In particular, it is suitable when the focal length f of the interchangeable lens 3A is short (or when the angle of view becomes wide due to the relationship between the size of the image sensor 22 and the focal length f).

(2) In the blur correction device of (1) above, the blur correction unit 40 of the interchangeable lens 3A outputs 50% of the image blur Δy2a to the blur correction drive mechanism 37, and the blur correction unit 21b of the camera body 2A The remaining 50% of Δy2a and the above difference d2 are output to the correction drive mechanism 26. Compared with the case where the shake correction drive mechanism 26 and the shake correction drive mechanism 37 are not used together, the movement distances of the shake correction drive mechanism 26 and the shake correction drive mechanism 37 can be suppressed to be small, respectively.

The share ratio determined by the CPU 21 may be 100% for image blur correction by the interchangeable lens 3A and 0% for image blur correction by the camera body 2A. In this case, the angle blur calculation unit 401 of the interchangeable lens 3A sets the image blur V(L) shared by the interchangeable lens 3A to 100%, and the angle blur calculation unit 201 of the camera body 2A shares the image shared by the camera body 2A. The blurring V(B) is d2. d2 is the difference between the image blur Δy2a at the first position different from the center of the image plane 70 and the image blur Δy2b at the second position different from the center of the image plane 70.

(Modification 5)
The image blur correction calculation based on the image blur V(B) in the above formulas (5) and (7) is performed by the blur correction unit 40 of the interchangeable lens 3A, and the image blurs in the above formulas (4) and (6) are calculated. The blur correction calculation based on V(L) may be performed by the blur correction unit 21a of the camera body 2A. According to the modified example 5 of the third embodiment, the position of the image plane 70 for calculating the image blur for the image blur correction by the interchangeable lens 3A and the image blur for the image blur correction by the camera body 2A are calculated. The position of the image plane 70 to be changed can be replaced with that in the case of the third embodiment or the modification 4 of the third embodiment.

(Modification 6)
Although the description of the contents of the second embodiment is omitted in the description of the third embodiment and the modification 4 of the third embodiment described above, the Y-axis when the camera 1A rotates in the Pitch direction When it is not possible to say that the focal length f is sufficiently larger than yp when correcting the direction, the same correction as that of the second embodiment is performed also in the X-axis direction. The angle shake calculation unit 201 and the angle shake calculation unit 401 perform addition calculation on each of the X-axis and the Y-axis with positive and negative signs according to the shake direction.

Further, the same is true at the time of correction in the X-axis direction when the camera 1A rotates in the Yaw direction. That is, when the focal length f is not sufficiently larger than xp in the correction in the X-axis direction when the camera 1A rotates in the Yaw direction, the Y-axis direction is similarly corrected. The angle shake calculation unit 201 and the angle shake calculation unit 401 perform addition calculation on each of the X-axis and the Y-axis with positive and negative signs according to the shake direction.

(Fourth Embodiment)
In the fourth embodiment, using the camera 1A of FIG. 10, image blur correction is performed exclusively by the interchangeable lens 3A. The camera 1A may be a single lens reflex type camera illustrated in FIG. 10 or a mirrorless type without the mirror 24.
Alternatively, the interchangeable lens 3A and the camera body 2A may be integrated into a lens-integrated camera.

<Position for calculating image blur>
The CPU 21 of the camera body 2A in the fourth embodiment may have an image of the main subject on the image plane 70 by, for example, one of the methods (1) to (4) in the first embodiment. Determines the high position. Then, the CPU 21 transmits information indicating the position determined on the image plane 70 to the blur correction unit 40 of the interchangeable lens 3A.

The timing at which the CPU 21 of the camera body 2A transmits the information of the position where the image blur is calculated on the image surface 70 to the blur correction unit 40 is, for example, the position where the CPU 21 calculates the image blur is determined (newly determined). Including cases and cases of updating).
The CPU 21 includes the above position information in the regular communication between the camera body 2A and the interchangeable lens 3A, and includes the above position information in the communication from the camera body 2A to the interchangeable lens 3A to instruct the start of image blur correction. The position information is immediately notified to the shake correction unit 40 by, for example,

The angle blur calculation unit 401 of the blur correction unit 40 calculates the image blur at the position indicated by the information received from the CPU 21, and performs the image blur correction based on this image blur.

When the position where the image blur is calculated is the center of the image plane 70, the mathematical expression representing the image blur Δy1 in the Y-axis direction is the above equation (2), as described in the first embodiment.
Further, when the position where the image blur is calculated is different from the center of the image plane 70, the mathematical expression representing the image blur Δy2 in the Y-axis direction is the above formula (1) as described in the first embodiment. is there.

The image blur correction in the fourth embodiment includes correction in the Y-axis direction when the camera 1A rotates in the Pitch direction and correction in the X-axis direction when the camera 1A rotates in the Yaw direction.
The above formulas (1) and (2) represent correction in the Y-axis direction when the camera 1A rotates in the Pitch direction. When the camera 1A rotates in the Yaw direction, the same correction as this is necessary in the X-axis direction.
The correction in the Y-axis direction when the camera 1A rotates in the Pitch direction and the correction in the X-axis direction when the camera 1A rotates in the Yaw direction are the same except that the directions are different. The description of is omitted.

Further, when the camera 1A rotates in the Pitch direction and the Yaw direction, image blurring on the X axis and the Y axis occurs simultaneously due to both rotational movements. Positive and negative signs are added to the directions of the axes, and the addition operation is performed. Then, based on the image blur after addition, correction is made in the X-axis and Y-axis directions.

In the fourth embodiment, similarly to the third embodiment, the image blur calculated by the translational blur calculator 402 is substantially constant even if the position on the image plane 70 (the image plane of the image sensor 22) is different. Treat as.
The outline of the fourth embodiment is as follows.
The angle blur calculation unit 401 of the blur correction unit 40 of the interchangeable lens 3A determines the position where the image blur is calculated on the image plane 70 at the position notified by the CPU 21 of the camera body 2A to calculate the image blur.
The translational blur calculation unit 402 calculates the image blur at the center of the image plane 70, for example.
The shake correction optical system target position calculation unit 403 determines whether the image shake calculated by the angle shake calculation unit 401 and the image shake calculated by the translational shake calculation unit 402 are positive or negative depending on the directions of the X-axis and Y-axis directions. The sign is added and the addition operation is performed. Then, the image blur amount at the position of the image plane 70 notified from the CPU 21 of the camera body 2A is calculated based on the image blur in the X axis direction and the Y axis direction after the addition.

According to the fourth embodiment described above, the following operational effects can be obtained.
(1) The image stabilization device includes an image sensor 22 that captures a subject image formed on the image plane 70 by the interchangeable lens 3A, a CPU 21 that determines a position on the image plane 70, and information about the position determined by the CPU 21. A camera body 2A having a CPU 21 for transmitting to 3A, a blurring correction optical system 33 for blurring correction, a blurring correction unit 40 for receiving position information from the camera body 2A, a position and a shake sensor received from the camera body 2A. The interchangeable lens 3A includes an image blur correction unit 40 that calculates an image blur Δy2 based on the shake detected in 39, and an image blur correction drive mechanism 37 that moves the image blur correction optical system 33 in a direction to suppress the image blur Δy2. .. Thereby, for example, the image blur can be appropriately suppressed at a position other than the center of the image plane 70 determined by the CPU 21 of the camera body 2A. In particular, it is suitable when the focal length f of the interchangeable lens 3A is short (or when the angle of view becomes wide due to the relationship between the size of the image sensor 22 and the focal length f).

(2) The blur correction unit 40 of the interchangeable lens 3A calculates the image blur Δy2 from the output of the shake sensor 39 and the focal length f of the interchangeable lens 3A. Accordingly, the image blur Δy2 can be appropriately calculated at a position other than the center of the image plane 70, and the image blur can be appropriately suppressed based on the image blur Δy2.

(Fifth Embodiment)
The fifth embodiment uses the camera 1A of FIG. 10 as in the fourth embodiment.
The image blur correction according to the fifth embodiment is performed by exclusively operating the blur correction driving mechanism 37 of the interchangeable lens 3A. However, the blur correction unit 21a of the CPU 21 of the camera body 2A and the blur correction unit 40 of the interchangeable lens 3A are performed. This is different from the fourth embodiment in that both perform calculation.
The camera 1A may be a single lens reflex type camera illustrated in FIG. 10 or a mirrorless type without the mirror 24.
Alternatively, the interchangeable lens 3A and the camera body 2A may be integrated into a lens-integrated camera.

<Position for calculating image blur>
The CPU 21 of the camera body 2A determines the position on the image plane 70 at which the image of the main subject is likely to exist, for example, by any of the methods (1) to (4) in the first embodiment. Then, the CPU 21 sets the center of the image plane 70 as the first position and the position determined as described above as the second position.

<Calculation on camera body side>
The blur correction unit 21a of the CPU 21 calculates the image blur at the first position and the second position of the image plane 70.
Specifically, the angle shake calculation unit 201 uses the detection signal from the angular velocity sensor of the shake sensor 31 around the axis parallel to the X axis (Pitch direction) to determine the image shake in the Y axis direction due to the rotational movement, and In that case, the image blur in the X-axis direction is calculated. In addition, the angle blur calculation unit 201 uses the detection signal from the angular velocity sensor of the shake sensor 31 around the axis parallel to the Y axis (Yaw direction) to detect the image blur in the X axis direction due to the rotational motion, and if necessary, Calculates the image blur in the Y-axis direction.

When the position where the image blur is calculated is the first position, the mathematical expression representing the image blur Δy1 in the Y-axis direction is the above formula (2) as described in the first embodiment.
When the position where the image blur is calculated is the second position and is different from the center of the image plane 70, the mathematical expression representing the image blur Δy2 in the Y-axis direction is as described in the first embodiment. It is the formula (1).

In the fifth embodiment, the blur correction unit 21a of the CPU 21 further calculates the ratio g of the image blur Δy1 at the first position and the image blur Δy2 at the second position by the following equation (8).
g=Δy2/Δy1 (8)
The above g is referred to as a correction coefficient g.
The CPU 21 transmits the information indicating the correction coefficient g to the blur correction unit 40 of the interchangeable lens 3A. Instead of the information indicating the ratio between Δy2 and Δy1, the CPU 21 may transmit information indicating the difference between Δy2 and Δy1 to the blur correction unit 40 of the interchangeable lens 3A.

Regarding the timing at which the CPU 21 of the camera body 2A transmits the information indicating the correction coefficient g to the blur correction unit 40, for example, the first position and the second position at which the CPU 21 calculates the image blur on the image plane 70 are determined (newly determined). (Including the case and the case of updating), the correction coefficient g is calculated.
The CPU 21 includes the above-mentioned information of the correction coefficient g in the steady communication between the camera body 2A and the interchangeable lens 3A, and the above-mentioned correction coefficient in the communication from the camera body 2A to the interchangeable lens 3A to instruct the start of the image blur correction. The information of the correction coefficient g is promptly notified to the shake correction unit 40 by including the information of g.

<Computation on the interchangeable lens side>
The angle shake calculation unit 401 of the shake correction unit 40 uses a detection signal around the axis (Pitch direction) parallel to the X axis by the angular velocity sensor 39a, similarly to the angle shake calculation unit 201 of the shake correction unit 21a of the camera body 2A. Then, the image shake in the Y-axis direction due to the rotational movement and, if necessary, the image shake in the X-axis direction are calculated. Further, the angle blur calculation unit 401 uses the detection signal around the axis (Yaw direction) parallel to the Y axis by the angular velocity sensor 39a to detect the image blur in the X axis direction due to the rotational motion and, if necessary, the Y axis direction. And the image blur of.

<Position for calculating image blur>
The blur correction unit 40 in the fifth embodiment calculates the image blur at the same position as the first position determined by the CPU 21 of the camera body 2A, which is the center of the image plane 70 in this example. Since the position where the image blur is calculated is the center of the image plane 70, the mathematical expression representing the image blur Δy1 in the Y-axis direction is the above equation (2), as described in the first embodiment.
The angle shake calculation unit 401 multiplies the image shake Δy1 in the Y-axis direction by a correction coefficient g based on the information received from the camera body 2A by the receiving unit to obtain an image in the second position of the image plane 70 in the Y-axis direction. The blur Δy2 is calculated.
When the information received from the camera body 2A is the information indicating the difference between Δy2 and Δy1, the angle blur calculation unit 401 calculates the image blur Δy2 by adding the received information to the image blur Δy1.

The translational blur calculation unit 402 calculates the image blur in the X-axis direction due to the translational motion by using the detection signal of the acceleration sensor 39b in the X-axis direction. Further, the translational blur calculation unit 402 calculates the image blur in the Y-axis direction due to the translational motion, using the detection signal in the Y-axis direction from the acceleration sensor 39b.

The blur correction optical system target position calculation unit 403 calculates the image blur in the X-axis direction and the Y-axis direction calculated by the angle blur calculation unit 401 and the image in the X-axis direction and the Y-axis direction calculated by the translation blur calculation unit 402. Image blurring in the X-axis direction and the image blurring in the Y-axis direction is calculated by adding the blurring.

Further, the blur correction optical system target position calculation unit 403 calculates the image blur in the X-axis direction and the Y-axis direction after the addition, the photographing magnification (calculated based on the position of the zoom optical system 31), and the subject from the camera 1A. The image blur amount at the second position of the image plane 70 is calculated based on the distance to 80 (calculated based on the position of the focus optical system 32).

The shake correction optical system target position calculation unit 403 operates the shake correction drive mechanism 37 of the interchangeable lens 3A to perform image shake correction, and thus moves the shake correction optical system 33 in a direction to cancel the calculated image shake amount. The target position of the shake correction optical system 33 is calculated.
Then, the shake correction optical system target position calculation unit 403 sends a signal indicating the target position to the shake correction drive mechanism 37 of the interchangeable lens 3A.

The image blur correction in the fifth embodiment includes correction in the Y-axis direction when the camera 1A rotates in the Pitch direction and correction in the X-axis direction when the camera 1A rotates in the Yaw direction.
The above formulas (1) and (2) represent correction in the Y-axis direction when the camera 1A rotates in the Pitch direction. When the camera 1A rotates in the Yaw direction, the same correction as this is necessary in the X-axis direction.
The correction in the Y-axis direction when the camera 1A rotates in the Pitch direction and the correction in the X-axis direction when the camera 1A rotates in the Yaw direction are the same except that the directions are different. The description of is omitted.

Further, when the camera 1A rotates in the Pitch direction and the Yaw direction, image blurring on the X axis and the Y axis occurs simultaneously due to both rotational movements. Positive and negative signs are added to the directions of the axes, and the addition operation is performed. Then, based on the image blur after addition, correction is made in the X-axis and Y-axis directions.

Note that, in the fifth embodiment, similarly to the fourth embodiment, the image blur calculated by the translational blur calculation unit 402 is substantially constant even if the position on the image plane 70 (the image plane of the image sensor 22) is different. Treat as.
The outline of the fifth embodiment is as follows.
The angle shake calculation unit 201 of the shake correction unit 21a of the camera body 2A calculates the image shake Δy1 and Δy2 at the first position (center of the image surface 70) and the second position of the image surface 70.
The blur correction unit 21a calculates a correction coefficient g which is a ratio between the image blur Δy1 at the first position and the image blur Δy2 at the second position, and information indicating the correction coefficient g is provided to the blur correction unit 40 of the interchangeable lens 3A. Send to.

The angle blur calculation unit 401 of the blur correction unit 40 of the interchangeable lens 3A calculates the image blur at the first position of the image plane 70 (center of the image plane 70). The angle blur calculation unit 401 further calculates the image blur at the second position of the image plane 70 by multiplying the image blur at the first position by the correction coefficient g based on the information received from the camera body 2A by the reception unit. ..
The translational blur calculation unit 402 of the blur correction unit 40 calculates the image blur at the first position, for example.
The shake correction optical system target position calculation unit 403 of the shake correction unit 40 determines whether the image shake at the second position and the image shake calculated by the translational shake calculation unit 402 are positive or negative depending on the directions of the X-axis and Y-axis directions. The sign is added and the addition operation is performed. Then, the image blur amount at the second position of the image plane 70 is calculated based on the image blur in the X axis direction and the Y axis direction after the addition.

According to the fifth embodiment described above, the following operational effects can be obtained.
(1) The blur correction device includes an image pickup element 22 for picking up a subject image formed on the image plane 70 by the interchangeable lens 3A, a CPU 21 for determining a position on the image plane 70, and a predetermined first position on the image plane 70. Based on the (center of the image plane 70) and the second position determined by the CPU 21 and the shake detected by the shake sensor 31, the image blur Δy1 and the image blur Δy2 at the first position (center of the image plane 70) and the second position are calculated. A camera body 2A having a blur correction unit 21a for calculating and a CPU 21 for transmitting information of a correction coefficient g which is a ratio of the image blur Δy1 and the image blur Δy2 or a difference to the interchangeable lens 3A, and a blur correction optical system for blur correction. 33, and a shake correction unit 40 that calculates the image shake Δy1 at the first position (center of the image surface 70) of the image sensor 22 based on the first position (center of the image surface 70) and the shake detected by the shake sensor 39. The image blur correction unit 40 that receives information from the camera body 2A, and the image blur Δy1 calculated by the image blur correction unit 40 are corrected based on the received information, and the image blur correction optical system 33 is oriented to suppress the image blur after correction. And an interchangeable lens 3A having a shake correction drive mechanism 37 for moving. As a result, the blur correction unit 40 of the interchangeable lens 3A can appropriately suppress image blur at the second position determined by the CPU 21 of the camera body 2A, for example. In particular, it is suitable when the focal length f of the interchangeable lens 3A is short (or when the angle of view becomes wide due to the relationship between the size of the image sensor 22 and the focal length f).

(2) The blur correction unit 21a of the camera body 2A calculates the image blur Δy1 and the image blur Δy2 from the output of the shake sensor 31 and the focal length f of the interchangeable lens 3A, and the blur correction unit 40 of the interchangeable lens 3A The image blur Δy1 is calculated from the output of the shake sensor 39 and the focal length f. Accordingly, the blur correction unit 40 of the interchangeable lens 3A can appropriately calculate the image blur Δy2 at the second position other than the center of the image surface 70, and can appropriately suppress the image blur based on the image blur Δy2.

You may combine 5th Embodiment and the modified example 4 of 3rd Embodiment mentioned above. The point that the image blur correction is performed by operating both the blur correction drive mechanism 26 of the camera body 2A and the blur correction drive mechanism 37 of the interchangeable lens 3A is common to the fourth modification of the third embodiment. Further, both the blur correction unit 21a of the CPU 21 of the camera body 2A and the blur correction unit 40 of the interchangeable lens 3A perform the calculation in common with the fifth embodiment.

For example, the CPU 21 of the camera body 2A informs the blur correction unit 40 of the interchangeable lens 3A to (a) information on the first position for calculating the image blur on the image plane 70, and (b) image blur correction by the interchangeable lens 3A and the camera. Information indicating the share ratio with the image blur correction by the body 2A is transmitted.
The blur correction unit 40 of the interchangeable lens 3A calculates the image blur at the first position of the image plane 70, and then obtains the image blur V(L) shared by the interchangeable lens 3A by the above equation (6).
On the other hand, the blur correction unit 21a of the camera body 2A calculates the angular blur at the first position of the image surface 70 and the image blur at the second position of the image surface 70, and then calculates the camera body 2A according to the above equation (7). The image blur V(B) to be shared is calculated.

The shake correction unit 40 of the interchangeable lens 3A calculates the target position of the shake correction optical system 33 based on the calculated image shake V(L) and the image shake calculated by the translational shake calculation unit 402, thereby changing the interchangeable lens. The image blur correction is performed by operating the image blur correction drive mechanism 37 of 3A.
Further, the blur correction unit 21a of the camera body 2A calculates the target position of the image sensor 22 based on the calculated image blur (B) and the image blur calculated by the translational blur calculation unit 202, and thus the camera body 2A. The image blur correction is performed by operating the blur correction driving mechanism 26.

In each of the above-described embodiments and its modifications, the image blur at the position where the blur is desired to be stopped is corrected. Therefore, it is assumed that the image blurring at the position determined by the CPU 21 on the image plane 70 is suppressed, while the image blurring remains at other positions on the image plane 70. In such a case, it may be combined with image restoration by image processing. The CPU 21 sends an instruction to the signal processing circuit 27, and the image blurring is conspicuous by, for example, strongly applying edge emphasis processing to the data corresponding to the other positions among the image data generated by the signal processing circuit 27. The image restoration process to be deleted is executed.

1, 1A... Camera 2, 2A... Camera body 3, 3A... Interchangeable lens 21... CPU
21a, 40... Shake correction unit 22... Image pickup elements 26, 37... Shake correction drive mechanisms 31, 39... Shake sensor 33... Shake correction optical system 70... Image plane 80... Subject

Claims (14)

In the interchangeable lens that can be attached to the camera body,
A motion detector for detecting the motion of the interchangeable lens,
Of the subject image, a receiving unit that receives information on the position of the subject image that is outside the optical axis of the imaging optical system and that corrects blurring,
A correction amount calculation unit that calculates the correction amount for correcting the blur of the subject image formed at the position outside the optical axis of the imaging optical system, which is received by the reception unit, based on the movement detected by the detection unit. When,
A blurring correction optical system for correcting the blurring of a subject image formed at a position off the optical axis based on the correction amount;
Interchangeable lens with. The interchangeable lens according to claim 1,
The interchangeable lens that receives the position information when the position for correcting the image blur selected from the subject image captured by the camera body is changed. The interchangeable lens according to claim 1,
The receiving unit is an interchangeable lens that receives the position information when a subject image is captured by the camera body. The interchangeable lens according to claim 3,
The receiving unit is an interchangeable lens that receives the position information when a signal of a subject image captured by the camera body is output to the display unit. The interchangeable lens according to any one of claims 1 to 4,
The said correction amount calculation part is an interchangeable lens which uses the distance from the said optical axis of the position outside the optical axis of the said imaging optical system for calculation of the correction amount for correcting the blurring of the said subject image. The interchangeable lens according to any one of claims 1 to 5,
The correction amount calculation unit is an interchangeable lens that uses a focal length of the imaging optical system to calculate a correction amount for correcting the blur of the subject image. The interchangeable lens according to any one of claims 1 to 5,
The movement of the interchangeable lens is a shake of the interchangeable lens, and the movement detection unit is an shake detection unit. In an image pickup apparatus having a camera body for picking up a subject image formed by an image pickup optical system, and an interchangeable lens attachable to the camera body,
The camera body is
Of the subject image, a transmission unit that transmits information on the position of the subject image that is outside the optical axis of the imaging optical system and that corrects blurring,
The interchangeable lens is
A motion detector for detecting the motion of the interchangeable lens,
A receiving unit for receiving information on the position of the subject image for correcting the blur, which is transmitted from the transmitting unit of the camera body,
Correction amount calculation for calculating the correction amount for correcting the blur of the subject image formed at a position outside the optical axis of the imaging optical system received by the receiving unit, based on the motion detected by the motion detecting unit Department,
A blurring correction optical system for correcting the blurring of a subject image formed at a position off the optical axis based on the correction amount;
An imaging device having a. The imaging device according to claim 8,
The image capturing apparatus, wherein the receiving unit receives the information of the position when the position for correcting the image blur selected from the subject image captured by the camera body is changed. The imaging device according to claim 8,
The receiving unit is an imaging device that receives the position information when a subject image is captured by the camera body. The imaging device according to claim 10,
The image capturing apparatus, wherein the receiving unit receives the position information when a signal of a subject image captured by the camera body is output to a display unit. The imaging device according to any one of claims 8 to 11,
The image pickup device, wherein the correction amount calculation unit uses a distance from a position outside the optical axis of the image pickup optical system to the optical axis to calculate a correction amount for correcting the blur of the subject image. The imaging device according to any one of claims 8 to 12,
The said correction amount calculation part is an imaging device which uses the focal length of the said imaging optical system for calculation of the correction amount for correcting the blurring of the said subject image. The imaging device according to any one of claims 8 to 13,
The movement of the interchangeable lens is a shake of the interchangeable lens, and the motion detection unit is a shake detection unit.

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