Anti-vibration control device and optical instrument

Abstract

To perform good anti-vibration by using lens anti-vibration and sensor anti-vibration, and preferentially use one of them more advantageous in imaging over the other.SOLUTION: An anti-vibration control device 209 controls the drive of first anti-vibration means that moves a correction optical system 114 to correct image shake, and second anti-vibration means that moves an image pickup device 104 picking up a subject image to correct image shake. The device acquires first information on the amount of movement of an image point with respect to the amount of movement of the correction optical system and second information related to the amount of movement of the image point with respect to the amount of movement of the image pickup device, and sets a correction ratio of the first anti-vibration means and the second anti-vibration means by using first information and second information. The device sets the correction ratio by using different standards according to the magnitude of a difference between the amount of movement of the image point and the amount of movement of the correction optical system and the amount of movement of the image pickup device obtained from the first information and the second information.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an image stabilization control device that controls an image stabilization function that optically reduces (corrects) image shake during image capture. [Background technology]

[0002] Optical image stabilization methods that optically correct image blur caused by camera shake (shake of an imaging device) include a lens shift method (hereinafter referred to as OIS) that moves a correction lens along the optical axis, and a sensor shift method (hereinafter referred to as IIS) that moves an imaging element along the optical axis. Patent Document 1 discloses an imaging device that selectively uses OIS or IIS depending on the imaging mode, power consumption, etc.

[0003] In a typical central projection optical system, the amount of movement of the image point on the image sensor due to camera shake can differ between the center and periphery near the optical axis. In particular, the wider the angle of view of the optical system, the greater the amount of image point movement in the periphery compared to the center. Furthermore, because many optical systems have distortion, when image stabilization is performed with an IIS, the amount of image point movement in the center and periphery differs due to the difference in the amount of distortion between the center and periphery. On the other hand, in an OIS, decentering distortion occurs due to lens decentering, and fluctuations in this decentering distortion cause differences in the amount of image point movement between the center and periphery. Furthermore, the ratio of the amount of image point movement in the center to the periphery differs between an IIS that is affected by distortion and an OIS that is affected by decentering distortion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-271437 Summary of the Invention [Problem to be solved by the invention]

[0005] When the ratio between the amount of image point shift at the center and the periphery of the OIS and IIS is large, it is advantageous for image quality including the periphery to use the OIS or IIS with the smaller amount of image point shift at the periphery first. Conversely, if the ratio between the amount of image point shift at the OIS and IIS is small, there is no significant difference in image quality regardless of which one is used.

[0006] However, OIS and IIS require different amounts of power to correct the same amount of image blur, and the volume of noise generated when driven also differs.

[0007] The present invention provides an image stabilization control device that can perform good image stabilization from the center to the periphery using an OIS and an IIS, and that can also give priority to using either the OIS or the IIS, whichever is more advantageous for imaging, over the other, and an imaging device equipped with the same. [Means for solving the problem]

[0008] One aspect of the present invention is an image stabilization control device that controls the operation of a first image stabilization unit that corrects image shake by moving a correction optical system that constitutes at least a part of an imaging optical system along an optical axis, and a second image stabilization unit that corrects image shake by moving an image sensor that captures a subject image formed by the imaging optical system along the optical axis. The image stabilization control device includes an acquisition unit that acquires first information regarding the amount of image point movement relative to the amount of movement of the correction optical system and second information regarding the amount of image point movement relative to the amount of movement of the image sensor, and a setting unit that sets the correction ratios of the first and second image stabilization units using the first and second information. The setting unit sets the correction ratios based on different criteria depending on the magnitude of the difference between the amount of image point movement relative to the amount of movement of the correction optical system and the image sensor, respectively, obtained from the first and second information. Note that an optical device equipped with the image stabilization control device also constitutes another aspect of the present invention.

[0009] Another aspect of the present invention is a vibration reduction control method for controlling the operation of a first vibration reduction unit that corrects image shake by moving at least a part of a correction optical system of an imaging optical system relative to the optical axis and a second vibration reduction unit that corrects image shake by moving an image sensor that captures a subject image formed by the imaging optical system relative to the optical axis. The method includes the steps of acquiring first information regarding an image point movement amount relative to the movement amount of the correction optical system and second information regarding an image point movement amount relative to the movement amount of the image sensor, and setting a correction ratio for the first and second vibration reduction units using the first and second information. In the step of setting the correction ratio, the correction ratio is set using different criteria when the difference between the image point movement amount relative to the movement amount of the correction optical system and the image sensor obtained from the first and second information is greater than a predetermined value and when it is smaller than a predetermined value. Note that a program for causing a computer to execute processing in accordance with the vibration reduction control method also constitutes another aspect of the present invention. [Effects of the Invention]

[0010] According to the present invention, the first and second vibration isolation means can provide good vibration isolation from the center to the periphery, and further, one of the first and second vibration isolation means that is more advantageous for imaging can be used in preference to the other. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a block diagram showing the configuration of an imaging system according to a first embodiment. [Figure 2] FIG. 1 is a block diagram showing the configuration of a vibration isolation system according to a first embodiment. [Figure 3] 4 is a flowchart showing an image stabilization control process in the first embodiment. [Figure 4] 6 is a flowchart showing a correction ratio calculation mode setting process in the first embodiment. [Figure 5] 10 is a flowchart showing a correction ratio calculation mode setting process in the second embodiment. [Figure 6] 4A and 4B are diagrams showing examples of image stabilization sensitivity of an OIS and an IIS in the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. [Example]

[0013] 1 shows the configuration of an imaging system according to a first embodiment of the present invention. The imaging system comprises an interchangeable lens 101 as a first optical device, and a camera body 100 as a second optical device to which the interchangeable lens 101 is detachably and communicably connected. The camera body 100 has a camera MPU 102, an operation unit 103, an image sensor 104, a camera-side contact terminal 105, a camera-side gyro sensor 106, an acceleration sensor 109, and a rear display 116.

[0014] The camera MPU 102 is a controller that handles overall control of the camera body 100 and the interchangeable lens 101, and controls various operations such as AE, AF, and image capture in response to inputs from an operation unit 103 (described later). The camera MPU 102 communicates various commands and information with the lens MPU 110 via a camera-side contact terminal 105 and a lens-side contact terminal 112 provided on the interchangeable lens 101. The camera-side contact terminal 105 and the lens-side contact terminal 112 also include a power supply terminal for supplying power from the camera body 100 to the interchangeable lens 101.

[0015] The operation unit 103 has a mode dial for setting various imaging modes, a release button for issuing instructions for imaging preparation operations and the start of imaging, etc. Pressing the release button halfway turns on a first switch (SW1), and pressing it all the way turns on a second switch (SW2). AE and AF are performed as imaging preparation operations when SW1 is turned on, and AE settings are confirmed and AF is stopped when SW2 is turned on, and an instruction to start imaging (exposure) is issued (SW2-1 is turned on). Actual exposure begins a predetermined time after this instruction (SW2-2 is turned on). SW2-1 and SW2-2 are turned off when the set exposure time has elapsed and imaging is completed. The on / on status of SW1, SW2-1, and SW2-2 is notified to the lens MPU 110 by communication from the camera MPU 102.

[0016] The image sensor 104 is configured with a photoelectric conversion element such as a CCD sensor or a CMOS sensor, and generates an image signal by photoelectrically converting an object image formed by an image pickup optical system (described later). The camera MPU 102 generates a video signal using the image signal from the image sensor 104.

[0017] The camera-side gyro sensor 106 is a shake sensor that detects angular shake (camera shake) applied to the camera body 100 due to camera shake or the like and outputs an angular velocity signal as a camera shake detection signal. The camera MPU 102 drives the image sensor actuator 107 based on the angular velocity signal and an IIS correction ratio (described later) to move the image sensor 104 in a direction perpendicular to the optical axis of the imaging optical system (described later). This reduces (corrects) image shake caused by camera shake. At this time, the camera MPU 102 performs feedback control of the image sensor actuator 107 so that the position of the image sensor 104 detected by the image sensor position sensor 108 (the amount of movement from a position on the optical axis that is the center of movement) approaches a target position. This corrects image shake by moving the image sensor 104, i.e., performs sensor vibration isolation (hereinafter referred to as IIS).

[0018] The acceleration sensor 109 is used to detect the attitude of the camera body 100 and to detect shift shake, which is difficult to detect among camera shakes using the camera-side gyro sensor 106 described above. The rear display 116, which serves as a display means, displays an image corresponding to a video signal generated by the camera MPU 102 using an imaging signal from the imaging element 104. Before capturing an image, the user can observe the displayed image as a viewfinder image (live view image). After capturing an image, a still image or video for recording generated by capturing an image can be displayed on the rear display 116. In this embodiment, "capturing an image" refers to capturing an image for recording.

[0019] The interchangeable lens 101 has an imaging optical system (not shown), the above-mentioned lens MPU 110, lens-side contact terminal 112, and lens-side gyro sensor 111. The lens-side gyro sensor 111 is a shake sensor that detects angular shake (lens shake) of the interchangeable lens 101 and outputs a lens shake detection signal as an angular velocity signal.

[0020] The lens MPU 110 drives the lens actuator 113 based on the lens shake detection signal and an OIS correction ratio (described later) to move a correction lens 114, which serves as a correction optical system that constitutes at least a part of the imaging optical system, in a direction perpendicular to the optical axis of the imaging optical system. At this time, the lens MPU 110 performs feedback control of the lens actuator 113 so that the position of the correction lens 114 detected by the lens position sensor 115 (the amount of movement from a position on the optical axis that is the center of movement) approaches a target position. In this way, image shake correction is performed by moving the image shake correction lens 114, i.e., lens image stabilization (hereinafter referred to as OIS).

[0021] The lens actuator 113 and the correction lens 114 correspond to a first vibration isolation means, and the image sensor actuator 107 and the image sensor 104 correspond to a second vibration isolation means.

[0022] 2 shows the configuration of the image stabilization system in the imaging system of this embodiment. The image stabilization system has a lens stabilization control unit 209 that controls the entire image stabilization system, including the OIS and IIS, as an image stabilization control device, and a camera stabilization control unit 201 that controls the IIS together with the lens stabilization control unit 209. The lens stabilization control unit 209 is provided in the lens MPU 110, and the camera stabilization control unit 201 is provided in the camera MPU 102.

[0023] It is also possible to employ a configuration in which the camera vibration isolation control unit 201, instead of the lens vibration isolation control unit 209, controls the entire vibration isolation system as a vibration isolation control device.

[0024] In the camera vibration isolation control unit 201, the camera gyro offset removal unit 202 removes the offset component from the angular velocity signal detected by the camera-side gyro sensor 106 mounted on the camera body 100. The camera-side angle conversion unit 203 converts the angular velocity signal output from the camera gyro offset removal unit 202 into an angle signal.

[0025] The camera information storage unit 204 stores IIS drive information, such as the maximum drive amount of the image sensor 104 in the IIS, drive characteristics, sound generated by drive (drive sound), and power required for drive (power consumption), as well as IIS sensitivity information (second information). The IIS sensitivity information is information relating to the amount of movement of the image point for each image height from the center to the periphery near the optical axis on the imaging surface relative to a predetermined movement amount (unit movement amount) of the image sensor 104 (hereinafter referred to as image point movement amount), i.e., information relating to image stabilization sensitivity. The IIS sensitivity information may be information indicating the IIS sensitivity itself, or information convertible to IIS sensitivity. Alternatively, it may be information indicating a function for calculating the IIS sensitivity. The IIS drive information and IIS sensitivity information are transmitted to the lens image stabilization control unit 209 via the camera transmission unit 205.

[0026] The camera-side cooperative control unit 207 receives information about the IIS correction ratio (described later) from the lens image stabilization control unit 209 via the camera receiving unit 206, and determines the amount of image blur to be corrected by IIS according to the IIS correction ratio. The image sensor drive control unit 208 generates an IIS drive signal for driving the image sensor 104 according to the angle signal from the camera-side angle conversion unit 203 and the IIS correction ratio from the camera-side cooperative control unit 207. Upon receiving the IIS drive signal, the image sensor actuator 107 drives the image sensor 104 in a direction perpendicular to the optical axis. The image sensor drive control unit 208 also has a function of detecting the drive amount of the image sensor 104 during driving (hereinafter referred to as the IIS drive amount).

[0027] In the lens vibration reduction control unit 209, a lens gyro offset removal unit 210 removes an offset component from an angular velocity signal detected by a lens side gyro sensor 111 mounted on the interchangeable lens 101. A lens side angle conversion unit 211 converts the angular velocity signal output from the lens gyro offset removal unit 210 into an angle signal.

[0028] The lens information storage unit 212 stores OIS drive information such as the maximum drive amount of the correction lens 114 in the OIS, drive characteristics, drive noise, and power required for drive, as well as OIS sensitivity information (first information). The OIS sensitivity information is information about the amount of image point movement for each image height from the center to the periphery on the imaging surface relative to a predetermined movement amount (unit movement amount) of the correction lens 114, in other words, information about image stabilization sensitivity. The OIS sensitivity information may be information that indicates the OIS sensitivity itself, or may be information that can be converted into OIS sensitivity or a function that calculates the OIS sensitivity.

[0029] Note that the OIS sensitivity information and IIS sensitivity information may be information that indicates the remaining amount of image blur (remaining amount of correction) for each image height on the peripheral side of the center when the correction lens 114 or the image sensor 104 is driven to correct a predetermined amount of image blur in the center. Since the remaining amount of image blur is determined by the amount of image point movement, information that indicates the remaining amount of image blur in the OIS or IIS is a type of information related to the amount of image point movement. Furthermore, the OIS sensitivity information and IIS sensitivity information may be information that differs depending on the zoom state of the imaging optical system or the position of the focus lens.

[0030] The lens-side cooperative control unit (acquisition means and setting means) 215 reads out OIS drive information and OIS sensitivity information from the lens information storage unit 212, and receives IIS drive information and IIS sensitivity information from the camera stabilization control unit 201 via the lens receiving unit 214. The lens-side cooperative control unit 215 calculates and determines an OIS correction ratio and an IIS correction ratio, which are the ratios between the amounts of image blur corrected by the OIS and the IIS, based on the OIS sensitivity information, IIS sensitivity information, IIS drive information, and OIS drive information. At this time, the lens-side cooperative control unit 215 performs a correction ratio determination process, which will be described later. The lens-side cooperative control unit 215 outputs the determined OIS correction ratio to the correction lens drive control unit 216, and transmits information about the determined IIS correction ratio to the camera stabilization control unit 201 (camera cooperative control unit 207) via the lens transmitting unit 213.

[0031] The correction lens drive control unit 216 generates an OIS drive signal for driving the correction lens 114, according to the angle signal from the lens side angle conversion unit 211 and the OIS correction ratio from the lens side cooperation control unit 215. Upon receiving the OIS drive signal, the lens actuator 113 drives the correction lens 114 in a direction perpendicular to the optical axis. The correction lens drive control unit 216 also has the function of detecting the drive amount of the correction lens 114 during drive (hereinafter referred to as the OIS drive amount).

[0032] The flowchart in Fig. 3 shows the vibration reduction control process (vibration reduction control method) performed by the lens vibration reduction control unit 209 (lens side cooperative control unit 215) and the camera vibration reduction control unit 201 (camera side cooperative control unit 207). The lens vibration reduction control unit 209 and the camera vibration reduction control unit 201, which function as computers, execute this process according to a program. "S" in the diagram indicates a step.

[0033] After the power supply of the imaging system is turned on and the camera MPU 102 and lens MPU 110 perform their initial operations, the lens vibration isolation control unit 209 and camera vibration isolation control unit 201 start this processing.

[0034] In step 301 , the lens vibration reduction control unit 209 reads and acquires OIS drive information and OIS sensitivity information from the lens information storage unit 212 , and receives and acquires IIS drive information and IIS sensitivity information from the camera vibration reduction control unit 201 .

[0035] Next, in step 302, the lens vibration reduction control unit 209 sets a mode for calculating the OIS and IIS correction ratios. Details of this process will be described later.

[0036] Next, in step 303, the lens vibration reduction control unit 209 calculates the OIS correction ratio A and the IIS correction ratio (1-A) based on the correction ratio calculation mode set in step 302, the OIS drive information and sensitivity information, and the IIS drive information and sensitivity information. The OIS correction ratio A may be selected between 0 and 1, or may be set to 0 or greater. When A is greater than 1, the OIS overcorrects shake, and the IIS operates to reduce the amount of overcorrection in accordance with (1-A), which becomes a negative ratio.

[0037] Next, in step 304, the lens vibration reduction control unit 209 drives the OIS in accordance with the calculated OIS correction ratio A. Then, the OIS drive amount is monitored while the OIS is being driven, and if in step 305 the OIS drive amount reaches a limited drive amount, which is the drive amount obtained by multiplying the maximum drive amount of the correction lens 114 by the OIS correction ratio A, the process proceeds to step 306.

[0038] In step 306, the lens vibration reduction control unit 209 holds the compensation lens 114 at the position of the limited drive amount, sets the IIS correction ratio to 1, and sends this to the camera vibration reduction control unit 201. As a result, the camera vibration reduction control unit 201 drives the image sensor 104 within the range of its maximum drive amount.

[0039] Meanwhile, in step 307, the camera vibration reduction control unit 201 drives the IIS in accordance with the IIS correction ratio (1-A) received from the lens vibration reduction control unit 209. Then, the IIS drive amount is monitored while the IIS is being driven, and if in step 308 the IIS drive amount reaches a limited drive amount, which is the drive amount obtained by multiplying the maximum drive amount of the image sensor 104 by the IIS correction ratio A, the process proceeds to step 309.

[0040] In step 309, the camera stabilization control unit 201 holds the image sensor 104 at the position of the limited drive amount, and sends a request to the lens stabilization control unit 209 to set the OIS correction ratio to 1. In response to this, the lens stabilization control unit 209 sets the OIS correction ratio to 1 and drives the correction lens 114 within the range of its maximum drive amount.

[0041] In this way, in this embodiment, by appropriately setting the OIS and IIS correction ratios based on information exchanged between the interchangeable lens 101 and the camera body 100, good cooperative image stabilization can be achieved by the OIS and IIS.

[0042] The flowchart in FIG. 4 shows the correction ratio calculation mode setting process executed in step 302 in FIG. 3. In step 401, the lens vibration reduction control unit 209 acquires the vibration reduction sensitivity for each image height of the OIS and IIS from the OIS sensitivity information and the IIS sensitivity information. FIGS. 6(a) and 6(b) show examples of the vibration reduction sensitivity for each image height of the OIS and IIS. As shown in these figures, the vibration reduction sensitivity of the OIS and IIS changes depending on the image height from the center to the periphery of the imaging surface. FIG. 6(a) shows an example where the difference in vibration reduction sensitivity between the OIS and IIS is large, and FIG. 6(b) shows an example where the difference in vibration reduction sensitivity between the OIS and IIS is small.

[0043] Next, in step 402, the lens vibration reduction control unit 209 determines whether the difference Dif in vibration reduction sensitivity between the OIS and IIS peripheral areas is greater than a predetermined threshold value Thd. If the difference Dif is greater than the threshold value Thd as shown in Figure 6(a), the process proceeds to step 403. If the difference Dif is equal to or less than the threshold value Thd as shown in Figure 6(b), the process proceeds to step 405.

[0044] In step 403, the lens vibration reduction control unit 209 sets the correction ratio calculation mode to the correction remaining amount reduction mode. As shown in FIG. 6A, when the vibration reduction sensitivity of the IIS in the peripheral area is significantly greater than that of the OIS, performing the IIS results in a larger image point movement amount in the peripheral area compared to when the OIS is performed, and the difference between the image point movement amount in the peripheral area and the image point movement amount in the central area remains as a residual image blur. Therefore, in step 404, the lens vibration reduction control unit 209 prioritizes the use of the OIS (one of the vibration reduction means) over the IIS (the other of the vibration reduction means). Specifically, the OIS priority drive range (predetermined drive range: a range of a predetermined drive amount smaller than the maximum drive amount) is set. Then, within the preferred drive range, the OIS correction ratio is set to 1 and the IIS correction ratio is set to 0, and only the OIS that produces less residual image blur in the peripheral area than the IIS is driven. Note that the OIS ratio may be set to 1 or more and the IIS ratio to 0 or less. Furthermore, outside the priority drive range, the OIS and IIS perform cooperative image stabilization by setting the OIS correction ratio to a value smaller than 1 and larger than 0. Furthermore, if the signs of the image stabilization sensitivity of the OIS and IIS are opposite to each other, the OIS and IIS correction ratio may be set based on the ratio of image stabilization sensitivity in the peripheral area.

[0045] In this way, when the difference in the amount of image point movement caused by the OIS and IIS in the peripheral area is large, the OIS correction ratio and IIS correction ratio are set based on the criterion of minimizing the amount of remaining image blur.

[0046] In step 405, the lens stabilization control unit 209 determines whether the imaging mode of the camera body 100 is set to image quality priority mode. If image quality priority mode, which prioritizes image quality for capturing images with the highest possible image quality, is set, the process proceeds to step 403, where the correction ratio calculation mode is set to correction remaining amount reduction mode in order to minimize the amount of remaining image blur in the peripheral areas. In the example shown in FIG. 6(b), the image stabilization sensitivity of the IIS is slightly lower than that of the OIS, so in step 404, the lens stabilization control unit 209 prioritizes the use of the IIS (one of the image stabilization means) over the OIS (the other image stabilization means). Specifically, within the priority driving range of the IIS, the IIS correction ratio A is set to 1 and the OIS correction ratio is set to 0, and only the IIS is driven. Outside the priority driving range, the IIS correction ratio is set to less than 1 but greater than 0, allowing cooperative image stabilization by the IIS and OIS. Within the priority driving range of the IIS, the IIS correction ratio may be set to 1 or more, and the OIS correction ratio to 0 or less.

[0047] Furthermore, if the image quality priority mode is not set, the lens vibration reduction control unit 209 sets the correction ratio calculation mode to the power consumption reduction mode in step 406. If the difference in vibration reduction sensitivity between the OIS and IIS in the peripheral area is small, the amount of remaining image blur in the peripheral area does not change much between the OIS and IIS, so power consumption reduction is prioritized.

[0048] In step 407, the lens stabilization control unit 209 compares the power consumption of the OIS and IIS obtained from the OIS and IIS drive information, and prioritizes use of the one with lower power consumption over the other. For example, if the IIS consumes less power than the OIS, the IIS correction ratio is set to 1 to drive only the IIS within the IIS priority drive range, and the IIS correction ratio is set to less than 1 and greater than 0 outside the priority drive range to perform cooperative stabilization by the OIS and IIS.

[0049] In this way, when the difference in the amount of image point movement caused by the OIS and IIS in the peripheral area is small, the OIS correction ratio and IIS correction ratio are set based on the criterion of minimizing power consumption.

[0050] As described above, according to the first embodiment, by setting the OIS and IIS correction ratios depending on the magnitude of the difference in image stabilization sensitivity between the OIS and IIS, it is possible to perform good image stabilization with a small amount of remaining image blur and image stabilization with reduced power consumption. [Example]

[0051] Fig. 5 shows the correction ratio calculation mode setting process executed in step 302 of Fig. 3 in the second embodiment of the present invention. Steps 501 to 504 are the same as steps 401 to 404 in the first embodiment (Fig. 4), and the description thereof will be omitted.

[0052] 6(b), if the lens vibration reduction control unit 209 determines in step 502 that the difference Dif is equal to or less than the threshold value Thd, it proceeds to step 505 and determines whether the imaging mode is set to a video mode in which audio is recorded along with video imaging. If the video mode is not set (if the still image mode is set), the lens vibration reduction control unit 209 proceeds to step 503 and sets the correction ratio calculation mode to the image blur remaining amount reduction mode.

[0053] On the other hand, if video mode is set, the lens stabilization control unit 209 proceeds to step 506 and sets the correction ratio calculation mode to drive sound reduction mode. Then, in step 507, the lens stabilization control unit 209 compares the volume of the drive sounds of the OIS and IIS obtained from the OIS and IIS drive information, and prioritizes use of the OIS or IIS with the quieter drive sound over the other. For example, if the IIS drive sound is quieter than the OIS, the IIS correction ratio is set to 1 to drive only the IIS within the IIS priority drive range, and the IIS correction ratio is set to less than 1 but greater than 0.5 outside the priority drive range to perform cooperative image stabilization by the OIS and IIS.

[0054] In this way, when the difference in the amount of image point movement caused by the OIS and IIS in the peripheral area is small, the OIS correction ratio and IIS correction ratio are set based on the criterion of minimizing the drive noise.

[0055] As described above, according to the second embodiment, by setting the OIS and IIS correction ratios depending on the magnitude of the difference between the image stabilization sensitivities of the OIS and IIS, it is possible to achieve good image stabilization with a small amount of remaining image blur and image stabilization with reduced drive noise that becomes noise in video shooting.

[0056] According to each embodiment, the OIS and IIS can provide good image stabilization from the center to the periphery, and furthermore, one of the OIS and IIS, which is more advantageous for imaging, can be used preferentially over the other.

[0057] In each embodiment, we have explained the case where different criteria are used depending on the magnitude of the difference in the amount of image point movement in the peripheral areas of the OIS and IIS, but it does not necessarily have to be the difference in the amount of image point movement in the peripheral areas, and different criteria can also be used depending on the magnitude of the difference in the amount of image point movement in the intermediate area between the center and the peripheral areas. (Other Examples) The present invention can also be realized by supplying a program that realizes one or more functions of the above-described embodiments 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.The present invention can also be realized by a circuit (e.g., ASIC) that realizes one or more functions.

[0058] The embodiments described above are merely representative examples, and various modifications and alterations are possible to each embodiment when implementing the present invention. [Explanation of symbols]

[0059] 100 camera body 101 Interchangeable Lenses 104 Image sensor 106 Camera side gyro sensor 111 Lens side gyro sensor 114 Corrective Lenses

Claims

1. A control device for controlling a first vibration isolation means that corrects image shake by moving a correction optical system included in an imaging optical system in a direction perpendicular to an optical axis of the imaging optical system, and a second vibration isolation means that corrects image shake by moving an imaging element that receives a subject image formed by the imaging optical system in a direction perpendicular to the optical axis, an acquisition means for acquiring first information on an image point movement amount corresponding to a movement amount of the correction optical system and second information on an image point movement amount corresponding to a movement amount of the imaging element; a setting means for setting a correction ratio of the first and second image stabilization means using the first and second information, A control device characterized in that the setting means sets the correction ratio in accordance with a difference in an image point movement amount relative to the respective movement amounts of the correction optical system and the imaging element obtained based on the first and second information.

2. 2. The control device according to claim 1, wherein the setting means sets the correction ratio in accordance with the difference in a peripheral portion away from the optical axis.

3. The control device according to claim 1 or 2, characterized in that, when the difference is greater than a predetermined value, the setting means sets the correction ratio of one of the first and second vibration isolation means having a smaller image point movement amount to be greater than the correction ratio of the other vibration isolation means.

4. The control device according to any one of claims 1 to 3, characterized in that, when the difference is smaller than a predetermined value, the setting means sets the correction ratio of one of the first and second vibration isolation means which consumes less power when driven to be larger than the correction ratio of the other vibration isolation means.

5. The control device according to any one of claims 1 to 3, characterized in that, when the difference is smaller than a predetermined value, the setting means sets the correction ratio of one of the first and second vibration isolation means, which has a quieter driving noise, to be larger than the correction ratio of the other vibration isolation means.

6. 6. The control device according to claim 4 or 5, characterized in that when image quality priority imaging or video imaging is performed when the difference is smaller than a predetermined value, the setting means sets the correction ratio of one of the first and second vibration isolation means having a smaller image point movement amount to be larger than the correction ratio of the other vibration isolation means.

7. The control device according to any one of claims 4 to 6, characterized in that the setting means sets the correction ratio of the other vibration-reduction means so that the other vibration-reduction means is not driven within a predetermined driving range of the one vibration-reduction means, and sets the correction ratio of the one and the other vibration-reduction means so that the one and the other vibration-reduction means are driven outside the predetermined driving range.

8. An optical device comprising the control device according to claim 1 and the imaging optical system.

9. An optical device comprising a control device described in any one of claims 1 to 7 and the imaging element.

10. A control method for controlling a first vibration reduction unit that corrects image shake by moving a correction optical system included in an imaging optical system in a direction perpendicular to an optical axis of the imaging optical system, and a second vibration reduction unit that corrects image shake by moving an image sensor that receives a subject image formed by the imaging optical system in a direction perpendicular to the optical axis, acquiring first information on an image point movement amount corresponding to a movement amount of the correction optical system and second information on an image point movement amount corresponding to a movement amount of the imaging element; and setting a correction ratio for the first and second image stabilization means using the first and second information, A control method characterized in that, in the step of setting the correction ratio, the correction ratio is set when a difference between an image point movement amount relative to the movement amount of the correction optical system and the imaging element obtained based on the first and second information is greater than or smaller than a predetermined value.

11. A program for causing a computer to execute a process according to the control method according to claim 10.

Images