Lens apparatus, imaging system, and method and program for controlling the lens apparatus

Abstract

To provide a lens device that can correct blurring of images correctly regardless of whether the camera has a function of correcting parallel blurring of the camera body.SOLUTION: A lens device (102) removably attached to an imaging device (101) includes: detection means (205) for detecting an angular vibration of the lens device; correction means (206) for correcting blurring of an image by driving a part of an imaging optical system of the lens device; and control means (204) for calculating a driving amount on the basis of an angle of rotation based on the output of the detection means and information for converting the angle of rotation to a driving amount. The control means changes the information on the basis of an imaging device attached to the lens device.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Conventionally, imaging devices (camera bodies) and lens devices (interchangeable lenses) equipped with a function (image shake correction function) for correcting image shake caused by camera shake or other shakes are known. Patent Document 1 discloses a method for determining whether or not to enable the image shake correction function of an interchangeable lens depending on the presence or absence of the image shake correction function of the camera body. Patent Document 2 discloses a method for performing image shake correction by correcting translational shake in the camera body and correcting angular shake in the interchangeable lens. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-174639 A [Patent Document 2] JP 2007-33740 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the method disclosed in Patent Document 1, if the camera body has an image stabilization function, the image stabilization function of the interchangeable lens is not activated, and therefore the image stabilization function of the interchangeable lens cannot be effectively utilized.

[0005] In the method disclosed in Patent Document 2, when an interchangeable lens that does not have a translational shake compensation function is attached to a camera body that does not have a translational shake compensation function, the effects of translational shake cannot be eliminated and appropriate image blur compensation cannot be performed.

[0006] SUMMARY OF THE PRESENT EMBODIMENTS Accordingly, an object of the present invention is to provide a lens apparatus, an imaging system, a control method for a lens apparatus, and a program that are capable of performing appropriate image blur correction regardless of whether or not the camera body has a translational shake correction function. [Means for solving the problem]

[0007] A lens device according to one aspect of the present invention includes a detection unit that detects a rotational shake of the lens device and outputs a rotational shake signal, a correction unit that corrects image blur by driving a part of an imaging optical system of the lens device, and a control unit that calculates a drive amount using the rotational shake signal and first information for converting the rotational shake signal into a drive amount. And The control means determines whether the imaging device attached to the lens device is an imaging device that includes a function for correcting translational shake or an imaging device that does not include a function for correcting translational shake, and if the imaging device has the function for correcting translational shake, The first information, The angular vibration signal centered on the principal point position of the imaging optical system of the lens device Drive amount For converting Second information To Change.

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

[0009] According to the present invention, it is possible to provide a lens apparatus, an imaging system, a control method for a lens apparatus, and a program that are capable of performing appropriate image blur correction regardless of whether or not the camera body has a translational shake correction function. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a central cross-sectional view of the imaging system in each embodiment. [Diagram 2] FIG. 2 is a block diagram of an imaging system in each embodiment. [Diagram 3] FIG. 11 is a block diagram of an imaging system as a modified example of each embodiment. [Figure 4] 2 is a block diagram of a shake correction system control unit according to the first embodiment. FIG. [Diagram 5] FIG. 11 is a block diagram of a shake correction system control unit as a modified example of the first embodiment. [Figure 6] 4 is a flowchart of a shake correction process of an interchangeable lens in the first embodiment. [Figure 7] 5A to 5C are explanatory diagrams of the center of shake rotation and the amount of image plane shake in each embodiment. [Figure 8] FIG. 11 is a block diagram of a shake correction system control unit according to a second embodiment. [Figure 9] 10 is a flowchart of a shake correction process of an interchangeable lens in a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

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

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

[0014] The imaging system 100, which is composed of the imaging device 101 and the interchangeable lens 102, has imaging means (imaging system), image processing means (image processing system), recording and reproducing means (recording and reproducing system), and control means (control system). The imaging means includes an imaging optical system 103 and an image sensor 105. The image processing means includes an image processing section 202. The recording and reproducing means includes a memory means 203 and a display means 207. Here, the display means 207 includes the rear display device 106, a small display panel (not shown) that displays shooting information provided on the upper surface of the imaging device 101, an electronic viewfinder (EVF) (not shown), and the like. The control means includes a camera system control section 201, a camera side operation means 208, a lens system control section 204, a lens side operation means 209, a lens shake detection means 205, a lens shake correction means 206, a lens position detection means 210, and a focal length change means 211. In addition to the vibration-proof lens unit 108, the lens system control unit 204 can also drive a focus lens, an aperture, a zoom lens, and the like (not shown).

[0015] The lens shake detection means 205 has an angular shake detection means capable of detecting rotation (angular shake (rotational shake) caused by rotation) applied to the imaging system 100 with respect to the optical axis 104. The angular shake detection means is, for example, a gyro sensor. The lens shake correction means 206 is a mechanism that shifts or tilts the vibration-proof 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 image sensor 105 via the image sensor optical system 103. Since the image sensor 105 provides a focus evaluation amount and an appropriate exposure amount, the image sensor 105 is exposed to an appropriate amount of object light by appropriately adjusting the image sensor optical system 103 based on a signal from the image sensor 105, and a subject image is formed near the image sensor 105.

[0017] The image processing unit 202 has an A / D converter, a white balance adjustment circuit, a gamma correction circuit, an interpolation calculation circuit, and the like, and can generate an image for recording. The image processing unit 202 has a color interpolation processing means, and generates a color image by performing color interpolation (demosaic) processing on a Bayer array signal. The image processing unit 202 also compresses images, videos, audio, and the like 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 to be presented to the user on the display means 207.

[0018] The camera system control unit 201 generates and outputs timing signals for imaging. In response to external operations, it controls the imaging means, image processing means, and recording / playback means. For example, the camera system control unit 201 detects the pressing of a shutter release button (not shown) and controls the drive of the image sensor 105, the operation of the image processing unit 202, compression processing, etc. Furthermore, it controls the state of each segment of the information display device that displays information using the display means 207. The rear display device 106 is a touch panel and may serve both as 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. The camera system control unit 201 is connected to the image processing unit 202, and determines an appropriate focus position and aperture position based on a signal from the image sensor 105 and a 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 the aperture driving means (not shown). In addition, in a mode in which shake correction is performed, the lens shake correction means 206 is appropriately controlled based on a signal obtained from the lens shake detection means 205 and information from the lens position detection means 210. The lens shake correction means 206 can be realized, for example, by a magnet and a flat coil. The lens position detection means 210 can be realized, for example, by a magnet and a Hall element.

[0020] As a specific control method, first, the lens system control unit 204 detects a shake signal detected by the lens shake detection means 205. Based on the result, a drive amount of the vibration-proof lens unit 108 for correcting image shake is calculated. The calculated drive amount is then 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 vibration-proof lens unit 108. As described above, still images and videos can be captured by controlling the operation of each part of the imaging device 101 in response to the user's operation on the camera side operation means 208.

[0021] Fig. 3 is a block diagram showing the electrical configuration of an imaging system 100a as a modified example of this embodiment. The imaging device 101a in Fig. 3 has an image blur correction mechanism as a control means in addition to the imaging device 101 in Fig. 2. The image blur correction mechanism of the imaging device 101a has 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 rotation (angular shake (rotational shake)) with respect to the optical axis 104 applied to the imaging device 101a, and movement on a plane perpendicular to the optical axis 104 (translational shake (shift shake) caused by parallel movement). The camera shake detection means 301 has 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 of the camera shake detection means 301 may be realized by generating a shake detection signal based on a comparison between multiple images obtained from the imaging element 105 by the image processing unit 202. The imaging element shake correction means 302 is a mechanism for shifting or tilting the imaging element 105 on a plane perpendicular to the optical axis 104.

[0023] In the shake correction mode, 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 signals obtained from the lens shake detection means 205 and the camera shake detection means 301 and information from the lens position detection means 210 and the imaging element position detection means 303. As a specific control method, the camera system control unit 201 and the lens system control unit 204 first detect the shake signals detected by the camera shake detection means 301 and the lens shake detection means 205, respectively. Based on the results, the camera system control unit 201 and the lens system control unit 204 respectively calculate the drive amounts of the imaging element 105 and the vibration-proof lens unit 108 to correct image shake. Thereafter, the camera system control unit 201 and the lens system control unit 204 send the calculated drive amounts as command values ​​to the image sensor shake correction means 302 and the lens shake correction means 206, respectively. Then, feedback control is performed so that the positions detected by the lens position detection means 210 and the image sensor position detection means 303 follow the command values, thereby driving the image sensor 105 and the vibration-proof lens unit 108, respectively.

[0024] Next, the configuration of the shake correction system control unit in this embodiment will be described with reference to Fig. 4 and Fig. 5. 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 has 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. These components configure the lens system control unit 204. 108 is an anti-vibration lens unit, 206 is a lens shake correction means, and 210 is a lens position detection means that acquires the position of the anti-vibration lens unit 108.

[0025] Fig. 5 is a block diagram of the shake correction system control unit of the imaging device 101a of Fig. 3. The imaging device 101a of Fig. 3 has a lens shake detection means 205, a lens system control unit 204, a lens shake correction means 206, an anti-vibration lens unit 108, and a lens position detection means 210, similar to the imaging device 101 of Fig. 2. The imaging device 101a also has a camera shake detection means 301, a camera system control unit 201, an image sensor shake correction means 302, an imaging device 105, and an image sensor position detection means 303. The camera shake detection means 301 has a camera side gyro sensor 501 and an acceleration sensor 502. The camera system control unit 201 has 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, the shake correction process of the interchangeable lens 102 that is detachable from the imaging device 101 (or imaging device 101a) will be described with reference to Fig. 6. Fig. 6 is a flowchart of the shake correction process of the interchangeable lens 102 in this 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 imaging device) of the imaging device (camera body) through communication.

[0027] Next, in step S602, the lens system control unit 204 determines whether or not the imaging device has a function for correcting translational shake (whether or not the imaging device is equipped with a translational shake correction function) based on the imaging device information acquired in step S601. 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 Figures 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 Figures 2 and 4, the process proceeds to step S604.

[0028] In step S603, the lens system control unit 204 sets the OIS sensitivity (sensitivity of the vibration-proof lens unit 108) to the principal 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 drive amount of the vibration-proof lens unit 108 by the lens side target generation unit 405.

[0029] Next, in step S605, the lens system control unit 204 determines whether or not 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 lens shake detection unit 205 using the adder 402 and the lens side gyro signal correction unit 403 to acquire the lens side shake amount. In FIG. 4, the lens side gyro signal correction unit 403 is shown to correct the shake signal using only the information of the lens side gyro sensor 401, but it may also correct using other information such as image information of the imaging device 101. In FIG. 5, it is shown to correct the signal of the lens side gyro sensor 401 based on the signal of the camera side gyro sensor 501 corrected by the camera side gyro signal correction unit 504, but it may also correct using other information of the imaging device 101a. Or, it may also correct using only the information of the interchangeable lens 102.

[0031] Next, in step S607, the lens system control unit 204 converts the shake signal from the angle into a drive 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 drive amount to the adder 406 as a target value (calculates the image shake correction amount). Next, 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 lens shake correction means position, and calculates the feedback control amount by the lens side servo controller 407 (servo control calculation). Next, 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, the amount of shake of the imaging device and its influence on the center of rotation and the image surface will be described with reference to FIG. 7. FIG. 7 is an explanatory diagram of the center of rotation of shake and the amount of image surface shake, and shows an optical path diagram when an object is imaged on the image surface through an optical system (imaging optical system). FIG. 7(a) shows a state in which no shake occurs in the imaging system. FIG. 7(b) shows an optical path diagram in the case where the imaging system rotates by an angle θ around the principal point position (front principal point) of the imaging optical system from the state in FIG. 7(a), that is, where an angular shake of an 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 the following formula (1).

[0033]

number

[0034] In formula (1), s' is the distance from the rear principal plane of the optical system to the imaging plane. In this case, the lens side target generator 405 calculates a target drive amount K1θ of the vibration-proof lens unit 108 such that the image moves by s'θ on the imaging plane. The coefficient K1 is defined as the front principal point-based OIS sensitivity. Then, the lens shake correction means 206 drives the vibration-proof lens unit 108 to the target drive amount K1θ, thereby enabling appropriate image blur correction.

[0035] Figure 7(c) shows an optical path diagram when the imaging system is rotated by an angle θ around an arbitrary point from the state in Figure 7(a). This is equivalent to the imaging system being rotated by an angle θ around the principal point position (front principal point) of the optical system and then translated by a displacement amount Δx. In other words, this is a state in which an angular shake of angle θ and a translational shake of displacement amount Δx have occurred. At this time, the imaging position on the imaging plane is displaced by Δx'1 and Δx'2 due to the angular shake and translational shake, respectively, and the displacement amount Δx'1+Δx'2 of the imaging position on the imaging plane, combining these, can be expressed as the following formula (2).

[0036]

number

[0037] In formula (2), β is the imaging magnification of the optical system, and l is 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 by the gyro sensor alone, and can be calculated by using information from the acceleration sensor 502 and the like. In this embodiment, when the interchangeable lens 102 is attached to the imaging device 101a shown in FIG. 3, the image sensor shake correction means 302 is used to correct translational shake, and the lens shake correction means 206 is used to correct angular shake. As in the case of FIG. 7(b), angular shake can be corrected by driving the vibration-proof 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 it is impossible to detect and correct translational shake, even if the vibration-proof lens unit 108 is driven to the target drive amount K1θ, a shake residue of the translational shake occurs.

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

[0039]

number

[0040] A target drive amount K2θ of the vibration-proof lens unit 108 that moves the image on the imaging surface by (s'+lβ)θ is calculated, and the vibration-proof lens unit 108 is driven to the target drive amount K2θ by the lens shake correction means 206. This makes it possible to correct angular shake and translational shake. Here, the coefficient K2 is defined as the imaging surface-based OIS sensitivity.

[0041] In general, in handheld photography, the user holds the imaging device (camera body) while taking pictures, so it is expected that the center of rotation of the imaging device will be near the imaging surface. If 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 front principal point-based OIS sensitivity. On the other hand, if the imaging device is not equipped with a translational shake correction function, angular shake is corrected using the imaging surface-based OIS sensitivity. In this way, by switching the OIS sensitivity according to the situation, an appropriate shake correction effect can be obtained.

[0042] As described above, according to the interchangeable lens of this embodiment, appropriate shake correction is possible regardless of whether or not the imaging device has a translational shake correction function.

[0043] Second embodiment Next, an imaging system according to a second embodiment of the present invention will be described with reference to Fig. 8 and Fig. 9. 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 image sensor shake correction means 302 performs translational shake correction, thereby achieving shake correction. On the other hand, in this embodiment, angular shake correction is performed using both the lens shake correction means 206 and the image sensor shake correction means 302. Only the parts that differ from the first embodiment will be described below.

[0044] In this embodiment, based on the shake information from both the lens shake detection means 205 and the camera shake detection means 301, both the lens shake correction means 206 and the image sensor shake correction means 302 perform angular shake correction simultaneously. 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 is corrected twice, and the shake is increased. Therefore, in this embodiment, the lens side correction ratio gain 801 and the camera side correction ratio gain 803 determine the ratio of how much shake correction each shake correction means performs for 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 performs shake correction by sharing half of the detected shake amount, and 100% shake correction can be performed by simultaneous driving. Since various information on the interchangeable lens side and various information on the imaging device side need to be exchanged between them, the interchangeable lens side acts as a slave and the imaging device side acts as a master, and information is exchanged by communication via electrical contacts 107.

[0045] 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. In addition to the elements shown in FIG. 5, the shake correction system control unit of this embodiment has 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 in the camera side angular shake signal generation unit 802 and the signal obtained by multiplying the sharing ratio of the imaging device by the camera side correction ratio gain 803, and the translational shake signal generated in the camera side translational shake signal generation unit 505. The camera side target generation unit 506 determines the drive amount of the image sensor shake correction means 302 based on the signal generated by the adder 804.

[0046] 9 is a flowchart of the shake correction process of the interchangeable lens 102 in this 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 about the imaging device (camera body) through communication. Here, the information about the imaging device includes information about whether or not the imaging device is equipped with a translational shake correction function. It may also include information for determining the ratio of rotational shake correction, such as the drivable stroke of the image sensor 105.

[0047] Next, in step S902, the lens system control unit 204 determines whether or not the imaging device is equipped with a translational shake correction function based on the imaging device information 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 Fig. 3 and Fig. 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 Fig. 2 and Fig. 4, the process proceeds to step S911. Note that steps S903 to S905 are similar to steps S603 and S605 to S606 in Fig. 6, respectively.

[0048] In step S906, the lens system control unit 204 multiplies the rotational shake signal by the OIS correction ratio using the lens side correction ratio gain 801. The OIS correction ratio can be a predetermined value (predetermined ratio). Alternatively, either the lens system control unit 204 or the camera system control unit 201 may determine the OIS correction ratio based on information about the interchangeable lens and the imaging device. The following steps S907 to S909 are similar to steps S607 to S609 in FIG. 6, respectively. Also, steps S910 to S915 are similar to 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, but both translational shake correction and angular shake correction may be performed by both the imaging device and the interchangeable lens. In this case, the detected translational shake signal is multiplied by the correction ratio gains of the imaging device and the interchangeable lens, as with the angular shake signal. The interchangeable lens needs to obtain the translational shake signal or information for calculating the translational shake signal from the imaging device by 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 information from their respective gyro sensors, but the angular shake signal may be generated based on information from either the gyro sensor of the interchangeable lens or the imaging device. In this embodiment, the lens system control unit 204 determines the reference position of the OIS sensitivity depending on whether the imaging device is equipped with a shake correction function, but may determine whether the imaging device is equipped with a 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 is equipped with only a 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 a translational shake signal detected by the imaging device.

[0051] (Other embodiments) The present invention can also be realized by a process in which a program for implementing one or more of the functions of the above-described embodiments is supplied to a system or device via a network or a storage medium, and one or more processors in a computer of the system or device read and execute the program. The present invention can also be realized by a circuit (e.g., ASIC) that implements one or more of the functions.

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

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

[0054] 101 Imaging device (camera body) 102 Interchangeable lenses (lens devices) 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 by using the rotational shake signal and first information for converting the rotational shake signal into 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 characterized in that, when the imaging device has a function of correcting the translational shake, the first information is changed to second information for converting the angular shake signal centered on a principal point position of the imaging optical system of the lens device into a drive amount.

2. 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 by using the rotational shake signal and first information for converting the rotational shake signal into 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 changes the first information to second information for converting the angular shake signal centered on a point located on an imaging plane of the imaging device into a drive amount when the imaging device does not have a function for correcting the translational shake.

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. 3. 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.

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

7. 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 of a part of an imaging optical system of the lens device 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, 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, comprising: when the imaging device has a function of correcting the translational shake, changing the first information to second information for converting the angular shake signal centered on a principal point position of the imaging optical system of the lens device into a drive amount.

8. 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 of a part of an imaging optical system of the lens device 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, 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: when the imaging device does not have a function of correcting the translational shake, changing the first information to second information for converting the angular shake signal centered on a point located on an imaging plane of the imaging device into a drive amount.

9. 9. A program for causing a computer to execute the method for controlling a lens apparatus according to claim 7.

Images