Lens device, imaging system, method for controlling lens device, and program

Abstract

To provide a lens device that can perform appropriate image shake correction regardless of the presence or absence of a translational shake correction function of a camera body.SOLUTION: A lens device (102) is removably attached to an imaging apparatus (101), and has: detection means (205) that detects an angular shake of the lens device; correction means (206) that corrects an image shake by driving part of the imaging optical system of the lens device; and control means (204) that calculates the amount of drive. The control means determines whether the imaging apparatus attached to the lens device is an imaging apparatus having a function to correct a translational shake or an imaging apparatus not having the function to correct a translational shake, and when the imaging apparatus has the function to correct a translational shake, calculates the amount of drive on the basis of first information for correcting a rotational shake and an angular shake signal.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a lens device having an image blur correction device.

Background Art

[0002] Conventionally, an imaging device (camera body) and a lens device (interchangeable lens) having a function of correcting image blur caused by shake such as hand shake (image blur correction function) are known. Patent Document 1 discloses a method of determining whether or not to enable the image blur correction function of an interchangeable lens depending on the presence or absence of the image blur correction function of the camera body. Patent Document 2 discloses a method of performing image blur correction by correcting translational shake with the camera body and correcting angular shake with the interchangeable lens.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the method disclosed in Patent Document 1, when the camera body has an image blur correction function, the image blur correction function of the interchangeable lens is not operated. Therefore, the image blur correction function provided in the interchangeable lens cannot be effectively utilized.

[0005] In the method disclosed in Patent Document 2, when an interchangeable lens having no translational shake correction function is attached to a camera body having no translational shake correction function, the influence of translational shake cannot be removed, and appropriate image blur correction cannot be performed.

[0006] Therefore, an object of the present invention is to provide a lens device, an imaging system, a control method for the lens device, and a program capable of performing appropriate image shake correction regardless of the presence or absence of a translational shake correction function of a camera body.

Means for Solving the Problems

[0007] A lens device according to an aspect of the present invention is a lens device detachable from an imaging device, comprising: detection means for detecting angular shake of the lens device and outputting an angular shake signal; correction means for correcting image shake by driving a part of an imaging optical system of the lens device; and control means for calculating a driving amount. The control means determines whether the imaging device mounted on the lens device is an imaging device including a function of correcting translational shake or an imaging device not including a function of correcting translational shake. When the imaging device has a function of correcting translational shake, the control means calculates the driving amount based on first information for correcting rotational shake and the angular shake signal.

[0008] Other objects and features of the present invention will be described in the following embodiments.

Effects of the Invention

[0009] According to the present invention, it is possible to provide a lens device, an imaging system, a control method for the lens device, and a program capable of performing appropriate image shake correction regardless of the presence or absence of a translational shake correction function of a camera body.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0012] (First Embodiment) First, with reference to FIGS. 1 to 7, an imaging system (camera system) 100 in the first embodiment of the present invention will be described. FIG. 1 is a central cross-sectional view of the imaging system 100. The imaging system 100 includes an imaging device (camera body) 101 and an interchangeable lens (lens device) 102 that is detachable from the imaging device 101. 103 is an imaging optical system including a plurality of lenses, 104 is the optical axis of the imaging optical system 103, 105 is an imaging element, 106 is a rear display device, 107 is an electrical contact between the imaging device 101 and the interchangeable lens 102, and 108 is an image stabilization lens unit (image stabilization means) provided in the interchangeable lens 102.

[0013] FIG. 2 is a block diagram showing the electrical configuration of the imaging device 101. Components denoted by the same reference numerals in FIGS. 1 and 2 correspond to each other. 201 is a camera system control unit, 202 is an image processing unit, and 203 is a memory means. 204 is a lens system control unit (control means) provided in the interchangeable lens 102. 205 is a lens shake detection means (detection means) for detecting the amount of shake of the imaging device 101 provided in the interchangeable lens 102. 206 is a lens shake correction means (correction means) for correcting image shake by driving the anti-shake lens unit 108 (a part of the imaging optical system of the interchangeable lens 102).

[0014] The imaging system 100 including the imaging device 101 and the interchangeable lens 102 has an imaging means (imaging system), an image processing means (image processing system), a recording and reproducing means (recording and reproducing system), and a control means (control system). The imaging means includes an imaging optical system 103 and an imaging element 105. The image processing means includes the image processing unit 202. The recording and reproducing means includes the memory means 203 and a display means 207. Here, the display means 207 includes a rear display device 106, a small display panel (not shown) for displaying shooting information provided on the upper surface of the imaging device 101, and an electronic viewfinder (EVF) (not shown), etc. The control means includes a camera system control unit 201, camera-side operation means 208, a lens system control unit 204, lens-side operation means 209, lens shake detection means 205, lens shake correction means 206, lens position detection means 210, and focal length changing means 211. Note that the lens system control unit 204 can drive a focus lens, an aperture, a zoom lens, etc. (not shown) in addition to the anti-shake lens unit 108.

[0015] The lens shake detection means 205 has an angular shake detection means capable of detecting rotation with respect to the optical axis 104 applied to the imaging system 100 (angular shake (rotational shake) generated by the rotation). The angular shake detection means is, for example, a gyro sensor. The lens shake correction means 206 is a mechanism for shifting or tilting the anti-shake lens unit 108 on a plane perpendicular to the optical axis 104.

[0016] The imaging means is an optical processing system that forms an image of light from an object on the imaging surface of the imaging device 105 via the imaging optical system 103. Since a focus evaluation amount and an appropriate exposure amount can be obtained from the imaging device 105, the imaging optical system 103 is appropriately adjusted based on the signal from the imaging device 105, so that object light with an appropriate light amount is exposed onto the imaging device 105, and a subject image is formed in the vicinity of the imaging device 105.

[0017] The image processing unit 202 includes an A / D converter, a white balance adjustment circuit, a gamma correction circuit, an interpolation operation circuit, etc., and can generate an image for recording. The image processing unit 202 has color interpolation processing means, and performs color interpolation (demosaicking) processing on the signal of the Bayer array to generate a color image. Also, the image processing unit 202 compresses images, moving images, audio, etc. using a predetermined method. The memory means 203 has a storage unit. The camera system control unit 201 outputs to the recording unit of the memory means 203 and displays an image presented to the user on the display means 207.

[0018] The camera system control unit 201 generates and outputs a timing signal etc. during imaging. In response to an external operation, it controls the imaging means, the image processing means, and the recording / reproducing means respectively. For example, when the camera system control unit 201 detects the pressing of a shutter release button (not shown), it controls the driving of the imaging device 105, the operation of the image processing unit 202, the compression processing, etc. Furthermore, it controls the state of each segment of the information display device that performs information display by the display means 207. The rear display device 106 may be a touch panel and may serve as both the display means 207 and the camera-side operation means 208.

[0019] Next, the adjustment operation of the optical system by the control means will be described. An image processing unit 202 is connected to the camera system control unit 201, and an appropriate focus position and aperture position are obtained based on the signal from the imaging element 105 and the user's operation by the camera-side operation means 208. The camera system control unit 201 issues a command to the lens system control unit 204 via the electrical contact 107, and the lens system control unit 204 appropriately controls the focal length changing means 211 and an aperture driving means (not shown). Also, in the mode for performing shake correction, the lens shake correction means 206 is appropriately controlled based on the signal obtained from the lens shake detection means 205 and the information of the lens position detection means 210. The lens shake correction means 206 can be realized by, for example, a magnet and a flat coil. The lens position detection means 210 can be realized by, for example, a magnet and a Hall element.

[0020] As a specific control method, first, the lens system control unit 204 detects the shake signal detected by the lens shake detection means 205. Based on the result, the driving amount of the anti-shake lens unit 108 for correcting image shake is calculated. Then, the calculated driving amount is sent to the lens shake correction means 206 as a command value, and feedback control is performed so that the position detected by the lens position detection means 210 follows the command value, thereby driving the anti-shake lens unit 108. As described above, by controlling the operations of the respective parts of the imaging device 101 according to the user's operation on the camera-side operation means 208, it is possible to capture still images and moving images.

[0021] FIG. 3 is a block diagram showing the electrical configuration of the imaging system 100a as a modification of the present embodiment. The imaging device 101a in FIG. 3 has a shake correction mechanism as a control means in addition to the imaging device 101 in FIG. 2. The shake correction mechanism of the imaging device 101a includes a camera shake detection means 301, an imaging element shake correction means 302, and an imaging element position detection means 303. The camera shake detection means 301 detects the amount of shake of the imaging device 101a. The imaging element shake correction means 302 drives the imaging element 105 to correct image shake.

[0022] The camera shake detection means 301 can detect the rotation with respect to the optical axis 104 applied to the imaging device 101a (angular shake (rotational shake)), and the movement on a plane perpendicular to the optical axis 104 (translational shake (shift shake) generated by translational movement). The camera shake detection means 301 includes an angular shake detection means for detecting angular shake and a translational shake detection means for detecting translational shake. The angular shake detection means is, for example, a gyro sensor. The translational shake detection means is, for example, an acceleration sensor. Alternatively, the function as the camera shake detection means 301 may be realized by generating a shake detection signal based on the comparison between a plurality of images obtained from the imaging element 105 by the image processing unit 202. The imaging element shake correction means 302 is a mechanism for driving the imaging element 105 to shift or tilt on a plane perpendicular to the optical axis 104.

[0023] In the mode for performing shake correction, the imaging device 101a in FIG. 3 appropriately controls the imaging element shake correction means 302 and the lens shake correction means 206. That is, the imaging device 101a controls the imaging element shake correction means 302 and the lens shake correction means 206 based on the signals obtained from the lens shake detection means 205 and the camera shake detection means 301 and the information of the lens position detection means 210 and the imaging element position detection means 303. As a specific control method, first, the camera system control unit 201 and the lens system control unit 204 respectively detect the shake signals detected by the camera shake detection means 301 and the lens shake detection means 205. Based on the results, the camera system control unit 201 and the lens system control unit 204 respectively calculate the driving amounts of the imaging element 105 and the anti-shake lens unit 108 for correcting image shake. Then, the camera system control unit 201 and the lens system control unit 204 respectively send the calculated driving amounts to the imaging element shake correction means 302 and the lens shake correction means 206 as command values. Then, by performing feedback control so that the positions detected by the lens position detection means 210 and the imaging element position detection means 303 follow the command values, the imaging element 105 and the anti-shake lens unit 108 are respectively driven.

[0024] Next, with reference to FIGS. 4 and 5, the configuration of the shake correction system control unit in the present embodiment will be described. FIG. 4 is a block diagram of the shake correction system control unit of the imaging device 101 in FIG. 2. In FIG. 4, the lens shake detection means 205 includes a lens-side gyro sensor 401. 402 and 306 are adders, 403 is a lens-side gyro signal correction means, 404 is a lens-side angular shake signal generation unit, 405 is a lens-side target generation unit, and 407 is a lens-side servo controller. The lens system control unit 204 is configured by these components. 108 is an anti-shake lens unit, 206 is a lens shake correction means, and 210 is a lens position detection means for acquiring the position of the anti-shake lens unit 108.

[0025] FIG. 5 is a block diagram of the shake correction system control unit of the imaging device 101a in FIG. 3. Similar to the imaging device 101 in FIG. 2, the imaging device 101a in FIG. 3 includes a lens shake detection means 205, a lens system control unit 204, a lens shake correction means 206, an anti-shake lens unit 108, and a lens position detection means 210. The imaging device 101a also includes a camera shake detection means 301, a camera system control unit 201, an imaging element shake correction means 302, an imaging element 105, and an imaging element position detection means 303. The camera shake detection means 301 includes a camera-side gyro sensor 501 and an acceleration sensor 502. The camera system control unit 201 includes adders 503 and 507, a camera-side gyro signal correction means 504, a camera-side translational shake signal generation unit 505, a camera-side target generation unit 506, and a camera-side servo controller 508.

[0026] Next, with reference to FIG. 6, the shake correction process for the interchangeable lens 102 detachable from the imaging device 101 (or the imaging device 101a) will be described. FIG. 6 is a flowchart of the shake correction process for the interchangeable lens 102 in the present embodiment. When power is supplied to the imaging device 101 (101a) and the interchangeable lens 102, the lens system control unit 204 starts the process. First, in step S601, the lens system control unit 204 acquires information (type of the imaging device) of the imaging device (camera body) by communication.

[0027] Subsequently, in step S602, based on the information of the imaging device acquired in step S601, the lens system control unit 204 determines whether the imaging device has a function to correct translational shake (whether the imaging device is equipped with a translational shake correction function). If the imaging device is equipped with a translational shake correction function, that is, if the imaging device is the imaging device 101a shown in FIGS. 3 and 5, the process proceeds to step S603. On the other hand, if the imaging device is not equipped with a translational shake correction function, that is, if the imaging device is the imaging device 101 shown in FIGS. 2 and 4, the process proceeds to step S604.

[0028] In step S603, the lens system control unit 204 sets the OIS sensitivity (the sensitivity of the vibration-proof lens unit 108) to the main point reference sensitivity of the optical system and proceeds to step S605. In step S604, the lens system control unit 204 sets the OIS sensitivity to the imaging surface reference sensitivity of the imaging device and proceeds to step S605. Here, the OIS sensitivity is information (conversion coefficient) for converting the angle signal (rotation angle) generated by the lens-side angular shake signal generation unit 404 into the driving amount of the vibration-proof lens unit 108 by the lens-side target generation unit 405.

[0029] Subsequently, in step S605, the lens system control unit 204 determines whether the shake correction function of the interchangeable lens 102 is OFF. If the shake correction function of the interchangeable lens 102 is OFF, the process ends. On the other hand, if the shake correction function of the interchangeable lens 102 is ON, the process proceeds to step S606.

[0030] In step S606, the lens system control unit 204 removes the offset component from the shake amount acquired by the shake detection means 205 by means of the adder 402 and the lens-side gyro signal correction means 403, and acquires the lens-side shake amount. In FIG. 4, the lens-side gyro signal correction means 403 is shown to correct the shake signal using only the information of the lens-side gyro sensor 401, but it may be corrected using other information such as the image information of the imaging device 101, for example. In FIG. 5, it is shown that the signal of the lens-side gyro sensor 401 is corrected based on the signal of the camera-side gyro sensor 501 corrected by the camera-side gyro signal correction means 504, but it may be corrected using other information of the imaging device 101a. Alternatively, it may be corrected using only the information of the interchangeable lens 102.

[0031] Subsequently, in step S607, the lens system control unit 204 converts the shake signal from an angle to a driving amount of the lens shake correction means 206 based on the OIS sensitivity determined in step S603 or step S604. Then, the lens system control unit 204 inputs the converted driving amount as a target value to the adder 406 (calculates the image shake correction amount). Subsequently, in step S608, the lens system control unit 204 acquires the position of the lens shake correction means 206 by the lens position detection means 210. Then, the lens system control unit 204 compares the lens-side shake correction target value generated in step S607 with the position of the lens shake correction means, and calculates a feedback control amount by the lens-side servo controller 407 (servo control calculation). Subsequently, in step S609, the lens system control unit 204 drives the lens shake correction means 206 according to the feedback control amount calculated in step S608, thereby performing shake correction (driving the image shake correction means).

[0032] Next, referring to FIG. 7, the shake amount of the imaging device, the rotation center, and the influence on the image plane will be described. FIG. 7 is an explanatory diagram of the rotation center of shake and the image plane shake amount, and shows an optical path diagram when the subject forms an image on the image plane through the optical system (imaging optical system). FIG. 7(a) shows a state where no shake occurs in the imaging system. FIG. 7(b) shows an optical path diagram when the imaging system rotates by an angle θ about the principal point position (front principal point) of the imaging optical system from the state of FIG. 7(a), that is, when angular shake of angle θ occurs. The rotation angle θ of the front principal point can be detected by the lens-side gyro sensor 401. At this time, the imaging position on the imaging surface is displaced by a displacement amount Δx'. The displacement amount Δx' can be expressed as in the following formula (1).

[0033]

Equation

[0034] In formula (1), s' is the distance from the rear principal point plane of the optical system to the imaging surface. In this case, the lens-side target generation unit 405 calculates the target drive amount K1θ of the anti-shake lens unit 108 such that the image moves by s'θ on the imaging surface. The coefficient K1 is defined as the front principal point reference OIS sensitivity. Thereafter, by driving the anti-shake lens unit 108 to the target drive amount K1θ by the lens shake correction means 206, appropriate image blur correction is possible.

[0035] FIG. 7(c) shows an optical path diagram when the imaging system rotates by an angle θ about an arbitrary point from the state of FIG. 7(a). This is synonymous with the imaging system rotating by an angle θ about the principal point position (front principal point) of the optical system and further translating by a displacement amount Δx. That is, it is a state where angular shake of angle θ and translational shake of displacement amount Δx occur. At this time, the imaging position on the imaging surface is displaced by Δx'1 and Δx'2 due to angular shake and translational shake respectively, and the combined displacement amount Δx'1 + Δx'2 of the imaging position on the imaging surface can be expressed as in the following formula (2).

[0036]

Equation

[0037] In Equation (2), β represents the imaging magnification of the optical system, and l represents the distance from the front principal point of the optical system to the rotation center position of the imaging device. The distance l cannot be detected only by the gyro sensor and can be calculated by using information such as the acceleration sensor 502. In the present embodiment, when the interchangeable lens 102 is attached to the imaging device 101a shown in FIG. 3, translational shake is corrected using the imaging element shake correction means 302, and angular shake is corrected using the lens shake correction means 206. Similar to the case of FIG. 7(b), angular shake can be corrected by driving the anti-shake lens unit 108 to the target drive amount K1θ. On the other hand, when the interchangeable lens 102 is attached to the imaging device 101 shown in FIG. 2, since detection and correction of translational shake are impossible, even if the anti-shake lens unit 108 is driven to the target drive amount K1θ, shake residue due to translational shake occurs.

[0038] FIG. 7(d) shows an optical path diagram when an arbitrary point in FIG. 7(c) is fixed at the intersection of the imaging surface and the optical axis. At this time, the distance l is the distance from the front principal point of the optical system to the imaging surface and is a known value. Therefore, the displacement amount Δx' of the imaging position on the imaging surface can be expressed as a function of θ as in the following Equation (3).

[0039]

Equation

[0040] The target drive amount K2θ of the anti-shake lens unit 108 is calculated such that the image moves by (s'+lβ)θ on the imaging surface, and the anti-shake lens unit 108 is driven to the target drive amount K2θ by the lens shake correction means 206. Thereby, correction of angular shake and translational shake is possible. Here, the coefficient K2 is defined as the imaging surface reference OIS sensitivity.

[0041] Generally, in hand-held shooting, since the user holds the imaging device (camera body) to take pictures, it is predicted that the rotation center of the imaging device is near the imaging surface. When the imaging device is equipped with a translational shake correction function, translational shake correction is performed, and at the same time, angular shake correction is performed using the OIS sensitivity based on the front principal point. On the other hand, when the imaging device is not equipped with a translational shake correction function, angular shake is corrected using the OIS sensitivity based on the imaging surface. By switching the OIS sensitivity according to the situation in this way, an appropriate shake correction effect can be obtained.

[0042] As described above, according to the interchangeable lens of the present embodiment, appropriate shake correction is possible regardless of the presence or absence of the translational shake correction function in the imaging device.

[0043] (Second Embodiment) Next, with reference to FIGS. 8 and 9, the imaging system in the second embodiment of the present invention will be described. In the first embodiment, when the interchangeable lens 102 is equipped with a translational shake correction function, the lens shake correction means 206 performs angular shake correction, and the imaging element shake correction means 302 performs translational shake correction to realize shake correction. On the other hand, in this embodiment, angular shake correction is performed using both the lens shake correction means 206 and the imaging element shake correction means 302. Hereinafter, only the parts different from the first embodiment will be described.

[0044] In this embodiment, based on the shake information of both the lens shake detection means 205 and the camera shake detection means 301, angular shake correction is simultaneously performed by both the lens shake correction means 206 and the imaging device shake correction means 302. Here, if the lens-side shake detection means and the camera-side shake detection means are driven in the same way, the actually detected shake will be corrected twice, and conversely, the shake will be increased. Therefore, in this embodiment, the lens-side correction ratio gain 801 and the camera-side correction ratio gain 803 determine the sharing ratio of how much each shake correction means corrects the shake amount with respect to the actually detected shake amount. For example, if the lens-side correction ratio gain 801 and the camera-side correction ratio gain 803 are each set to 50%, each shake correction means shares half of the detected shake amount and performs shake correction, so that 100% shake correction can be performed by simultaneous driving. Since it is necessary to transfer various information on the interchangeable lens side and various information on the imaging device side to each other, information is transferred by communication via the electrical contact 107 with the interchangeable lens side as a slave and the imaging device side as a master.

[0045] FIG. 8 is a block diagram of the shake correction system control unit of this embodiment when the imaging device is the imaging device 101 of FIG. 3. The shake correction system control unit in this embodiment includes, in addition to the elements shown in FIG. 5, a lens-side correction ratio gain 801, a camera-side angular shake signal generation unit 802, a camera-side correction ratio gain 803, and an adder 804. The camera system control unit 201 adds, in the adder 804, the angular shake signal generated by the camera-side angular shake signal generation unit 802 and the translational shake signal generated by the camera-side translational shake signal generation unit 505 to the signal obtained by multiplying the sharing ratio of the imaging device by the camera-side correction ratio gain 803. The camera-side target generation unit 506 determines the driving amount of the imaging device shake correction means 302 based on the signal generated by the adder 804.

[0046] FIG. 9 is a flowchart of the shake correction process of the interchangeable lens 102 in the present embodiment. When power is supplied to the imaging device 101 and the interchangeable lens 102, the lens system control unit 204 starts the process. First, in step S901, the lens system control unit 204 acquires information of the imaging device (camera body) by communication. Here, the information of the imaging device includes information on whether the imaging device is equipped with a translational shake correction function. Further, it may include information for determining the sharing ratio of angular shake correction, such as the drivable stroke of the imaging element 105.

[0047] Subsequently, in step S902, the lens system control unit 204 determines whether the imaging device is equipped with a translational shake correction function based on the information of the imaging device acquired in step S901. If the imaging device is equipped with a translational shake correction function, that is, if the imaging device is the imaging device 101a shown in FIGS. 3 and 8, the process proceeds to step S904. On the other hand, if the imaging device is not equipped with a translational shake correction function, that is, if the imaging device is the imaging device 101 shown in FIGS. 2 and 4, the process proceeds to step S911. Note that steps S903 to S905 are the same as steps S603, S605 to S606 in FIG. 6, respectively.

[0048] In step S906, the lens system control unit 204 multiplies the angular shake signal by the OIS correction ratio using the lens-side correction ratio gain 801. As the OIS correction ratio, a predetermined value (predetermined ratio) can be used. Alternatively, based on the information of the interchangeable lens and the imaging device, either the lens system control unit 204 or the camera system control unit 201 may determine the OIS correction ratio. The subsequent steps S907 to S909 are the same as steps S607 to S609 in FIG. 6, respectively. Further, steps S910 to S915 are the same as steps S604 to S609 in FIG. 6, respectively.

[0049] In this embodiment, translational shake correction is performed by the imaging device, and angular shake correction is performed by both the imaging device and the interchangeable lens. However, both translational shake correction and angular shake correction may be performed by both the imaging device and the interchangeable lens. In this case, for the detected translational shake signal, similar to the angular shake signal, the correction ratio gains of the imaging device and the interchangeable lens are multiplied respectively. The interchangeable lens needs to acquire the translational shake signal or information for calculating the translational shake signal from the imaging device using communication through the electrical contact 107 or the like.

[0050] In this embodiment, the interchangeable lens and the imaging device generate an angular shake signal based on the information of their respective gyro sensors. However, an angular shake signal may be generated based on the information of the gyro sensor of either the interchangeable lens or the imaging device. Also, in this embodiment, the lens system control unit 204 determines the reference position of the OIS sensitivity according to whether the imaging device is equipped with a shake correction function. However, it may be determined according to whether the imaging device is equipped with translational shake detection means. For example, when an interchangeable lens is attached to an imaging device that does not have a shake correction function but only has translational shake detection means, the interchangeable lens may perform angular shake correction using the front principal point reference OIS sensitivity, and further perform translational shake correction using the translational shake signal detected by the imaging device.

[0051] (Other Embodiments) The present invention can also be realized by supplying a program that realizes one or more functions of the above-described embodiment to a system or device via a network or a storage medium, and having one or more processors in the computer of the system or device read and execute the program. Further, it can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

[0052] In each embodiment, the control means calculates a driving amount using the rotation angle based on the output of the detection means and information (OIS sensitivity) for converting the rotation angle into a driving amount. Further, the control means changes the information based on the imaging device mounted on the lens device. Therefore, according to each embodiment, it is possible to provide a lens device, an imaging system, a control method of the lens device, and a program capable of performing appropriate image blur correction regardless of the presence or absence of the translational shake correction function of the camera body.

[0053] As described above, the preferred embodiments of the present invention have been described. However, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist thereof.

Explanation of reference numerals

[0054] 101 Imaging device (camera body) 102 Interchangeable lens (lens device) 204 Lens system control unit (control means) 205 Lens shake detection means (detection means) 206 Lens shake correction means (correction means)

Claims

1. A lens device that is detachable from an imaging device, a detection means for detecting a rotational shake of the lens device and outputting a rotational shake signal; a correction unit that corrects image blur by driving a part of an imaging optical system of the lens device; A control means for calculating a drive amount, The control means determining whether the imaging device attached to the lens device is an imaging device including a translational shake correction function or an imaging device not including a translational shake correction function; A lens device comprising: an imaging device having a function of correcting translational shake; a driving amount calculated based on first information for correcting rotational shake and the angular shake signal;

2. 2 . The lens device according to claim 1 , wherein the first information is information for converting the angular vibration signal centered on a principal point position of the imaging optical system of the lens device into a drive amount.

3. 3. The lens apparatus according to claim 1, wherein the first information is a conversion coefficient by which the angular shake signal is multiplied.

4. 4. The lens apparatus according to claim 1, wherein the first information is a sensitivity of an anti-vibration lens unit that constitutes the part of the imaging optical system.

5. A lens device that is detachable from an imaging device, a detection means for detecting a rotational shake of the lens device and outputting a rotational shake signal; a correction unit that corrects image blur by driving a part of an imaging optical system of the lens device; A control means for calculating a drive amount, The control means determining whether the imaging device attached to the lens device is an imaging device including a translational shake correction function or an imaging device not including a translational shake correction function; a lens device that calculates the drive amount based on second information for correcting the translational shake and rotational shake and the angular shake signal when the imaging device does not have a function for correcting the translational shake.

6. 6. The lens device according to claim 5, wherein the second information is information for converting the angular shake signal centered on a point located on an imaging plane of the imaging device into a drive amount.

7. 7. The lens apparatus according to claim 5, wherein the second information is a conversion coefficient by which the angular shake signal is multiplied.

8. 8. The lens apparatus according to claim 5, wherein the second information is a sensitivity of an anti-vibration lens unit that constitutes the part of the imaging optical system.

9. 5. The lens apparatus according to claim 1, wherein, when the imaging apparatus has the function of correcting the translational shake, the control unit calculates the drive amount using a predetermined ratio.

10. An imaging system comprising: a lens apparatus according to claim 1; and an imaging device.

11. A method for controlling a lens device that is detachable from an imaging device, comprising: a detection step of detecting an angular shake of the lens device using a detection means configured to detect the angular shake and output an angular shake signal; a calculation step of calculating a driving amount of a part of the imaging optical system of the lens device; a correction step of correcting image blur by driving a part of the imaging optical system, In the calculation step, it is determined whether the imaging device attached to the lens device is an imaging device including a translational shake correction function or an imaging device not including a translational shake correction function; a control method for a lens device, the control method comprising: calculating the driving amount based on first information for correcting rotational shake and the angular shake signal when the imaging device has a function for correcting translational shake;

12. A method for controlling a lens device that is detachable from an imaging device, comprising: a detection step of detecting an angular shake of the lens device using a detection means configured to detect the angular shake and output an angular shake signal; a calculation step of calculating a drive amount by using the rotational shake signal and first information for converting the rotational shake signal into a drive amount; a correction step of correcting image blur by driving a part of the imaging optical system of the lens device, In the calculation step, determining whether the imaging device attached to the lens device is an imaging device including a translational shake correction function or an imaging device not including a translational shake correction function; a control method for a lens device, comprising: calculating the driving amount based on second information for correcting the translational shake and rotational shake and the angular shake signal when the imaging device does not have a function for correcting the translational shake.

13. A program for causing a computer to execute the method for controlling a lens apparatus according to claim 11 or 12.

Images