Control device, imaging device, lens device, control method, and program

Abstract

The present invention provides a control device that can reduce the driving noise of the image stabilization mechanism without degrading the image stabilization performance. [Solution] The control device (5) has a correction amount calculation means (21) that calculates a correction amount for shake correction using a signal acquired from a shake detection means (15), and a control means (22) that controls a shake correction means (14) that performs shake correction based on the correction amount and control characteristics. The correction amount calculation means has a first calculation characteristic (21a) and a second calculation characteristic (21b), and the control means has a first control characteristic (22a) and a second control characteristic (22b) as control characteristics. When transitioning in the order of first state, second state, and third state in response to user instructions, the correction amount calculation means switches the first calculation characteristic to the second calculation characteristic when transitioning from the second state to the third state, and the control means switches the first control characteristic to the second control characteristic when transitioning from the first state to the second state.

Description

Technical Field

[0001] The present invention relates to a control device, an imaging device, a lens device, a control method, and a program.

Background Art

[0002] Conventionally, for the shooting preparation state (live view state (LV state)), by changing the control of the actuator of the shake correction means to the shooting state (during exposure), a method of improving the responsiveness to camera shake and improving the shake correction performance during exposure is known. On the other hand, when changing the control of the actuator, the driving sound of the actuator may increase. Also, there is a possibility that the shake correction means moves slightly at the timing of changing the control of the actuator. Patent Document 1 discloses a method of reducing the minute movement of the shake correction means and preventing the occurrence of minute image blur in a captured image by switching the control mode step by step.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the method disclosed in Patent Document 1, since the control mode is switched step by step after receiving the exposure start instruction, a time lag (release time lag) occurs from when the user gives the exposure start instruction until the actual exposure starts.

[0005] Therefore, an object of the present invention is to provide a control device capable of reducing the driving sound of the shake correction means without degrading the shake correction performance.

Means for Solving the Problems

[0006] A control device as one aspect of the present invention includes a correction amount calculation means that calculates a correction amount for shake correction using a signal acquired from a shake detection means, and a control means that controls a shake correction means that performs shake correction based on the correction amount and control characteristics, wherein the correction amount calculation means has a first calculation characteristic and a second calculation characteristic that calculates the correction amount capable of correcting low-frequency shake compared to the first calculation characteristic, and the control means has a first control characteristic and a second control characteristic that has higher responsiveness compared to the first control characteristic as the control characteristics, and when transitioning in the order of a first state, a second state, and a third state in response to a user instruction, the correction amount calculation means switches the first calculation characteristic to the second calculation characteristic when transitioning from the second state to the third state, and the control means switches the first control characteristic to the second control characteristic when transitioning from the first state to the second state.

[0007] Other objects and features of the present invention are described in the following examples. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a control device that can reduce the driving noise of the image stabilization means without degrading the image stabilization performance. [Brief explanation of the drawing]

[0009] [Figure 1] These are the central cross-sectional view and block diagram of the imaging system in Example 1. [Figure 2] This is a block diagram of the image stabilization system in Example 1. [Figure 3] This is an explanatory diagram of the target generation characteristics in Example 1. [Figure 4] This is an explanatory diagram of the servo control characteristics in Example 1. [Figure 5] This is a diagram illustrating the switching between conventional target generation characteristics and servo control characteristics. [Figure 6] This is an explanatory diagram illustrating the switching of target generation characteristics and servo control characteristics in Example 1. [Figure 7] This is a flowchart showing the control method in Example 1. [Figure 8] This diagram illustrates the switching between target generation characteristics and servo control characteristics during conventional continuous shooting. [Figure 9] This is an explanatory diagram illustrating the switching of target generation characteristics and servo control characteristics in Example 2. [Figure 10] This is a flowchart showing the control method in Example 2. [Modes for carrying out the invention]

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. [Examples]

[0011] (Description of the imaging system) First, the imaging system 100 in Embodiment 1 of the present invention will be described with reference to Figures 1(a) and (b). Figure 1(a) is a central cross-sectional view of the imaging system 100. Figure 1(b) is a block diagram showing the electrical configuration of the imaging system 100. In Figures 1(a) and (b), common parts are denoted by the same reference numerals.

[0012] The imaging system 100 includes a camera body (imaging device) 1 and a lens device 2 that is detachably attached to the camera body 1. However, this embodiment is not limited to this, and can also be applied to imaging devices in which the camera body and lens device are integrally configured.

[0013] In FIGS. 1(a) and 1(b), reference numeral 3 denotes an imaging optical system having a plurality of lenses provided in lens device 2; reference numeral 4 denotes the optical axis of imaging optical system 3; reference numeral 5 denotes a camera system control unit; reference numeral 6 denotes an imaging element; reference numeral 7 denotes an image processing unit; reference numeral 8 denotes memory means; reference numeral 9 denotes a shutter provided on the front surface of imaging element 6; reference numeral 10 denotes display means; reference numeral 3a denotes a shake correction lens that performs shake correction in imaging optical system 3; reference numeral 10a denotes a rear display device provided on the rear surface of camera body 1; reference numeral 11 denotes an operation detection unit that detects a signal from operation means including a shutter release button (not shown).

[0014] Reference numeral 12 denotes an electrical contact for communication between camera body 1 and lens device 2; reference numeral 13 denotes a lens system control unit (control device) provided in lens device 2; reference numeral 14 denotes shake correction means for driving imaging element 6 in a plane perpendicular to optical axis 4; reference numeral 15 denotes shake detection means for detecting the amount of shake of camera body 1; reference numeral 16 denotes shake correction control means provided in camera system control unit (control device) 5; reference numeral 17 denotes shooting preparation state determination means for determining whether shooting preparation has been completed; reference numeral 18 denotes shooting start state determination means for determining whether shooting has started; reference numeral 19 denotes shooting completion state determination means for determining whether shooting has been completed.

[0015] An imaging system 100 configured to include camera body 1 and lens device 2 has imaging means, image processing means, recording / reproducing means, and control means. The imaging means includes imaging optical system 3 and imaging element 6; the image processing means includes image processing unit 7; the recording / reproducing means includes memory means 8 and display means 10; and the control means includes camera system control unit 5, operation detection unit 11, shake detection means 15, shake correction means 14, and lens system control unit 13. Note that lens system control unit 13 can drive a focus lens and an aperture (iris diaphragm) (not shown) in addition to shake correction lens 3a using drive means (not shown).

[0016] The shake detection means 15 can detect rotational shake with respect to the optical axis 4 applied to the camera body 1, and is realized using, for example, a vibration gyro or the like. The shake correction means 14 drives the imaging element 6 on a plane perpendicular to the optical axis 4 based on the amount of rotational shake detected by the shake detection means 15.

[0017] In addition, the shake detection means 15 is provided with, for example, an acceleration sensor or the like, and can detect translational shake applied to the camera body 1. Therefore, the shake correction means 14 drives the imaging element 6 on a plane perpendicular to the optical axis 4 based on the rotational shake and translational shake detected by the shake detection means 15.

[0018] The imaging means is an optical processing system that forms an image of light from an object on the imaging surface of the imaging element 6 via the imaging optical system 3. A signal indicating the focus evaluation amount / appropriate exposure amount is obtained from the imaging element 6. For this reason, by appropriately adjusting the imaging optical system 3 based on this signal, object light of an appropriate amount is exposed to the imaging element, and a subject image is formed near the imaging element 6.

[0019] The image processing unit 7 has an A / D converter, a white balance adjustment circuit, a gamma correction circuit, an interpolation arithmetic circuit, and the like, and can generate an image for recording. The image processing unit 7 also has color interpolation processing means, and performs color interpolation (demosaicking) processing on the signal of the Bayer array to generate a color image. The image processing unit 7 also compresses images, moving images, audio, and the like using a predetermined method.

[0020] The memory means 8 has an actual storage unit. The camera system control unit 5 outputs an image and the like to the storage unit of the memory means 8, and displays an image to be presented to the user on the display means 10.

[0021] The camera system control unit 5 generates and outputs timing signals for image capture. It controls the imaging system, image processing system, and recording / playback system in response to external operations. For example, the operation detection unit 11 detects the pressing of a shutter release button (not shown). The camera system control unit 5 then controls the driving of the image sensor 6, the operation of the image processing unit 7, and the compression process. The camera system control unit 5 also controls the state of each segment of the information display device that displays information via the display means 10. The rear display device 10a may be, for example, a touch panel and may also serve as the display means 10 and the operation means.

[0022] The adjustment operation of the control system's optical system will now be explained. The camera system control unit 5 is connected to the image processing unit 7, which determines the appropriate focus position and aperture position based on the signal from the image sensor 6. The camera system control unit 5 issues commands to the lens system control unit 13 via the electrical contacts 12, and the lens system control unit 13 appropriately controls the focus lens driving means and aperture driving means (not shown).

[0023] Next, the basic operation of the image stabilization control means 16 included in the camera system control unit 5 will be explained. First, the camera system control unit 5 detects the camera shake signal (rotational shake and translational shake) detected by the shake detection means 15. Based on the result, the camera system control unit 5 calculates the amount to drive the image sensor 6 to correct the image shake. After that, the camera system control unit 5 outputs the calculated drive amount as a command value to the image stabilization means 14 and drives the image sensor 6.

[0024] In this embodiment, in addition to the control described above, the camera system control unit 5 changes the control of the image stabilization means 14 according to the shooting state obtained from the shooting preparation state determination means 17, the shooting start state determination means 18, and the shooting completion state determination means 19. The detailed control method will be described later.

[0025] Furthermore, as described above, the camera system control unit 5 and the lens system control unit 13 control the operation of each part of the camera body 1 and lens device 2 in response to user operations on operating means (not shown) provided on the camera body 1 and lens device 2. This enables the capture of both still images and videos.

[0026] In this embodiment, the case in which the camera body 1 has image stabilization means 14 is described, but the image stabilization means 14 may be provided on the lens device 2, or the image stabilization means 14 may be provided on both the camera body 1 and the lens device 2. The camera system control unit 5 can obtain the effects of this embodiment by controlling the image stabilization means 14 in the same manner as described later.

[0027] (Explanation of the image stabilization system control) Next, with reference to Figure 2, the camera system control unit 5 in this embodiment will be described in detail. Figure 2 is a control block diagram of the image stabilization system (image stabilization detection means 15, camera system control unit 5, and image stabilization means 14) provided in the camera body 1. Here, the operation of the image stabilization control means 16 will be described in particular. The image stabilization control means 16 generates a control target value (target) corresponding to the correction amount used for image stabilization from the image stabilization signal obtained from the image stabilization signal 15, and calculates a drive control amount for servo-controlling the image stabilization means 14 based on that target.

[0028] In Figure 2, 21 is a target generation unit (correction amount calculation means that calculates the correction amount for image stabilization) that generates (calculates) a control target value (target) for use in image stabilization from the image stabilization signal obtained from the image stabilization signal 15 in the image stabilization control means 16. Specifically, the target generation unit 21 is composed of a high-pass filter and a gain compensator based on the characteristics of the image stabilization signal 15, and an integrator that processes the angular velocity signal obtained from the image stabilization signal 15.

[0029] 22 is a servo control unit (control means that controls the image stabilization means 14 which performs image stabilization based on the correction amount and control characteristics for image stabilization) that calculates a drive control amount for servo-controlling the image stabilization means 14 based on the target generated by the target generation unit 21. Specifically, the servo control unit 22 is a PID controller that calculates a drive control amount for the image stabilization means 14 based on the target generated by the target generation unit 21. The PID controller calculates a drive control amount for the image stabilization means 14 by referring to the position detection result (position information) of an image stabilization means (position detection means) not shown that detects the position of the image stabilization member (image sensor 6) relative to the target generated by the target generation unit 21. 23 is a shooting state determination means. The shooting state determination means 23 includes a shooting preparation state determination means 17, a shooting start state determination means 18, and a shooting completion state determination means 19, etc.

[0030] The target generation unit 21 has a first target generation characteristic (first calculation characteristic) 21a and a second target generation characteristic (second calculation characteristic) 21b, and changes its target generation characteristic by referring to the shooting state obtained from the shooting state determination means 23. Similarly, the servo control unit 22 has a first servo control characteristic (first control characteristic) 22a and a second servo control characteristic (second control characteristic) 22b, and changes its servo control characteristic by referring to the shooting state obtained from the shooting state determination means 23.

[0031] The targets generated by the first target generation characteristic 21a (first calculation characteristic) have characteristics more suitable for image stabilization in the shooting preparation state than the targets generated by the second target generation characteristic 21b (second calculation characteristic). Specifically, the time constant of the high-pass filter is set higher for the first target generation characteristic 21a than for the second target generation characteristic 21b. In addition, regarding the characteristics of the integrator, the first target generation characteristic 21a is an incomplete integrator, while the second target generation characteristic 21b may be a complete integrator.

[0032] Generally, in the shooting preparation state, such as when performing framing, the user performs an action called panning, which involves moving the camera body 1 significantly. In such cases, if image stabilization is performed to cancel out the framing action (by operating the image stabilization means 14), the user will not be able to perform the intended framing. For this reason, it is preferable not to perform image stabilization in the relatively low frequency band, such as the movement during framing. In this embodiment, such framing and panning actions correspond to shooting preparation actions. However, this embodiment is not limited to these, and any other action performed by the user before actual exposure (shooting) on ​​the image sensor 6 is included in shooting preparation actions.

[0033] Therefore, the target generation unit 21 excludes low-frequency movements such as the user's framing actions from the correction target of the image stabilization by applying a high-pass filter to the image stabilization signal obtained from the image stabilization means 15, as in the first target generation characteristic 21a. Furthermore, it is preferable to use an incomplete integral for the integrator in the first target generation characteristic 21a.

[0034] On the other hand, during the period when the image sensor 6 is taking images (during exposure of the image sensor 6), it is preferable to eliminate as much camera shake as possible that is detected by the blur detection means 15. For this reason, the target generation unit 21 uses a filter with a lower high-pass filter time constant than the first target generation characteristic 21a, as in the second target generation characteristic 21b. Furthermore, it is preferable to use a complete integral for the integrator in the second target generation characteristic 21b.

[0035] Furthermore, the first servo control characteristic 22a (first control characteristic) has characteristics more suitable for the shooting preparation state than the second servo control characteristic 22b (second control characteristic). Specifically, the responsiveness of the image stabilization means 14 is set lower, resulting in lower drive noise.

[0036] Generally, it is preferable for the camera body 1 to be quiet. On the other hand, if the goal is to improve the image stabilization performance, improving the high-frequency servo control performance and increasing the responsiveness of the image stabilization means 14 to correct high-frequency camera shake will result in a louder actuator drive noise. However, the maximum image stabilization performance is required during the actual shooting period (during the exposure period of the image sensor 6), and in contrast, it is preferable for the actuator drive noise to be quiet during the pre-shooting preparation state when there is no intention to shoot. This allows the user to perform shooting preparations such as framing without being bothered by the actuator drive noise, and also reduces the power consumption of the actuator.

[0037] Therefore, the second servo control characteristic 22b has improved high-frequency servo control performance and higher responsiveness of the vibration correction means 14 in the high-frequency band compared to the first servo control characteristic 22a.

[0038] The shooting state determination means 23 includes a shooting preparation state determination means 17, a shooting start state determination means 18, and a shooting completion state determination means 19. The shooting preparation state determination means 17 determines, for example, that shooting preparation has started based on the user's detection of a half-press state (S1) of the shutter release button. The shooting start state determination means 18 determines, for example, that shooting has started based on the detection of a fully pressed state (S2) of the shutter release button. The shooting completion state determination means 19 determines, for example, that shooting has been completed based on the detection of whether or not the exposure of the image sensor 6 has been completed. As described above, the system transitions in the following order according to the user's instructions: shooting standby state (first state), shooting preparation state (second state), shooting start state (third state), and shooting completion state (fourth state).

[0039] The determination methods for the shooting preparation state determination means 17, the shooting start state determination means 18, and the shooting completion state determination means 19 are not limited to the methods described above, but may be other methods. In this embodiment, the shooting preparation state determination means 17 is described using a method that determines whether shooting preparation has started by determining the half-press state (S1) of the shutter release button. However, the determination method for the shooting preparation state determination means 17 may also be determined by the AE (metering) start timing or the AF (autofocus) start timing, in addition to the half-press state of the shutter release button. For example, if a metering means is provided, the shooting preparation state may be determined using the AE start timing by the metering means, or if a distance measuring means is provided, the shooting preparation state may be determined using the AF start timing by the distance measuring means.

[0040] (Explanation of differences in servo control characteristics) Next, the differences in characteristics between the target generation unit 21 and the servo control unit 22 will be explained with reference to Figures 3(a) and 3(b) and Figures 4(a) and 4(b). Figures 3(a) and 3(b) are explanatory diagrams of the target generation characteristics in the target generation unit 21. In Figure 3(a), the horizontal axis represents frequency and the vertical axis represents gain. In Figure 3(b), the horizontal axis represents frequency and the vertical axis represents phase. In Figure 3(a), 31 represents the gain characteristics of the first target generation characteristic 21a, and 32 represents the gain characteristics of the second target generation characteristic 21b. In Figure 3(b), 33 represents the phase characteristics of the first target generation characteristic 21a, and 34 represents the phase characteristics of the second target generation characteristic 21b.

[0041] As explained with reference to Figure 2, the first target generation characteristic 21a uses a filter with a higher high-pass time constant than the second target generation characteristic 21b. Therefore, as shown in Figure 3(a), the inflection frequency f31 of the gain characteristic 31 is set higher than the inflection frequency f32 of the gain characteristic 32, resulting in a characteristic that cuts relatively low frequencies. Similarly, the inflection frequency of the phase characteristic 33 is set higher than that of the phase characteristic 34. Here, the inflection frequency is the frequency corresponding to the point where the gain characteristic bends (inflection point), and corresponds to the angular frequency ω = 1 / T.

[0042] These effects prevent the camera from interfering with the user's framing actions, such as framing, when the user is not yet planning to take a picture and is in a preparatory state. On the other hand, during the period when the image sensor 6 is taking a picture (when the image sensor 6 is exposed and the user intends to take a picture), image stabilization is performed down to a sufficiently low frequency, making it possible to obtain good shooting results with minimal camera shake.

[0043] Figures 4(a) and 4(b) are explanatory diagrams of the servo control characteristics in the servo control unit 22. In Figure 4(a), the horizontal axis represents frequency and the vertical axis represents gain. In Figure 4(b), the horizontal axis represents frequency and the vertical axis represents phase. In Figure 4(a), 41 represents the gain characteristics of the first servo control characteristic 22a, and 42 represents the gain characteristics of the second servo control characteristic 22b. In Figure 4(b), 43 represents the phase characteristics of the first servo control characteristic 22a, and 44 represents the phase characteristics of the second servo control characteristic 22b.

[0044] As explained with reference to Figure 2, the second servo control characteristic 22b improves the servo control performance at higher frequencies than the first servo control characteristic 22a, and the vibration correction means 14 has a higher responsiveness. Therefore, as shown in Figure 4(a), the inflection frequency f42 of the gain characteristic 42 is set higher than the inflection frequency f41 of the gain characteristic 41, and the vibration correction means 14 is able to respond to relatively higher frequencies. Similarly, the phase characteristic 44 also has less phase delay at higher frequencies compared to the phase characteristic 43, and the vibration correction means 14 is able to respond to relatively higher frequencies. In addition, the first servo control characteristic 22a produces less actuator drive noise than the second servo control characteristic 22b, resulting in a quieter operation.

[0045] These effects enable the camera to perform image stabilization up to a sufficiently high frequency during the period when the image sensor 6 is taking a picture (during exposure of the image sensor 6, when there is an intention to take a picture), resulting in good shooting results with minimal camera shake. At the same time, during pre-shooting preparations such as framing, when there is no intention to take a picture yet, the sound of the actuators driving during user operation will not be heard, thus eliminating any degradation of the quality of the camera body 1.

[0046] (Explanation of how to switch control characteristics) Next, the switching methods for the target generation unit 21 and the servo control unit 22 will be explained with reference to Figures 5(a) and (b) and Figures 6(a) and (b). Figures 5(a) and (b) are explanatory diagrams for the switching of conventional target generation characteristics and servo control characteristics. Figure 5(a) shows the switching of target generation characteristics and servo control characteristics at the start of shooting. Figure 5(b) shows the switching of target generation characteristics and servo control characteristics at the completion of shooting. In both Figures 5(a) and (b), time t is taken on the horizontal axis, and the changes in the state of the camera body 1, the characteristics of the target generation unit, and the characteristics of the servo control unit are shown from left to right as time progresses.

[0047] Conventionally, the target generation characteristics and servo control characteristics are switched only in response to the change in state (whether or not the image sensor 6 is in shooting mode). Therefore, at the start of shooting as shown in Figure 5(a), the target generation characteristics and servo control characteristics are not switched when changing from the shooting standby state (so-called live view state (LV state)) to the shooting preparation state (S1 state). In other words, the first target generation characteristics and first servo control characteristics are used for image stabilization control. Subsequently, at the timing of switching to the shooting state (S2 state), the second target generation characteristics and second servo control characteristics are switched to perform image stabilization control during exposure. When changing the servo control characteristics, there is a possibility that the image stabilization means 14 may unintentionally move slightly due to the change in control, which can affect the captured image and cause slight blurring.

[0048] Similarly, as shown in Figure 5(b), when shooting is completed, the second target generation characteristic is switched to the first target generation characteristic, and the second servo control characteristic is switched to the first servo control characteristic, at the timing when the shooting state (S2 state) is completed. In addition, when changing from the second target generation characteristic to the first target generation characteristic in the target generation unit, there are cases where a gradual and smooth switch to the first target generation characteristic is employed, rather than making an abrupt change. By calculating both the first target generation characteristic and the second target characteristic simultaneously and switching gradually after shooting, it is possible to prevent abrupt changes in the image displayed in the EVF after shooting (sharp changes in the field of view).

[0049] On the other hand, the second target generation characteristic, due to the characteristics of its integrator, has the characteristic that the signal begins to change as soon as exposure starts. Therefore, even if you switch from the first target generation characteristic to the second target generation characteristic at the start of exposure, there will be no abrupt change in the field of view. For this reason, the target generation characteristic may be gradually changed only when exposure is complete.

[0050] Figures 6(a) and 6(b) are explanatory diagrams for the switching of target generation characteristics and servo control characteristics in this embodiment. Figure 6(a) shows the switching of target generation characteristics and servo control characteristics at the start of shooting. Figure 6(b) shows the switching of target generation characteristics and servo control characteristics at the completion of shooting. In both Figures 6(a) and 6(b), time t is plotted on the horizontal axis, and the changes in the state of the camera body 1, the characteristics of the target generation unit, and the characteristics of the servo control unit are shown from left to right as time progresses.

[0051] In this embodiment, the target generation characteristics and servo control characteristics are switched according to the change in the shooting state determined by the shooting preparation state determination means 17, the shooting start state determination means 18, and the shooting completion state determination means 19.

[0052] As shown in Figure 6(a), when shooting begins, the system determines that there is an intention to shoot when the state changes from the shooting standby state (LV state) to the shooting preparation state (S1 state), and first switches from the first servo control characteristic 22a to the second servo control characteristic 22b. Subsequently, when the system switches to the shooting state (S2 state), it switches from the first target generation characteristic 21a to the second target generation characteristic 21b.

[0053] In this way, by switching between the target generation characteristics and the servo control characteristics, it is possible to maintain quiet operation in the shooting standby state (LV state). In the shooting preparation state (S1), the first target generation characteristic 21a is used, so it does not interfere with the user's framing operation (low-frequency camera shake is not corrected). Also, because the second servo control characteristic 22b is used, camera shake that needs to be eliminated (high-frequency camera shake) is corrected even in the shooting preparation state, making it possible to provide comfortable framing operation. Furthermore, in the shooting state (S2 state), the second target generation characteristic 21b is used, so it becomes possible to correct even low-frequency camera shake effectively. At the same time, since the servo control characteristics have already been switched to the second servo control characteristic 22b, the minute movements of the shake correction means 14 do not affect the captured image due to the change in servo control characteristics, and minute blurs do not occur. Note that the shooting standby state is simply a state where the live view image is displayed on the display unit but the shutter release button is not half-pressed, and the display unit that displays the live view image may be the display means 10 or a display means of an external device.

[0054] As shown in Figure 6(b), when shooting is completed, at the moment the shooting state (S2 state) is completed and the state changes to the shooting preparation state (LV state and S1 state), the system first switches from the second target generation characteristic 21b to the first target generation characteristic 21a. Subsequently, when the shooting preparation state (LV state and S1 state) is released and the system switches to the shooting standby state (LV state and S1 release state), it is determined that there is no longer an intention to shoot, and the system switches from the second servo control characteristic 22b to the first servo control characteristic 22a.

[0055] In this way, by switching between the target generation characteristics and the servo control characteristics, it becomes possible to maintain the second servo control characteristic 22b even after shooting is complete, as long as the shutter release button remains in a half-pressed state (LV state and S1 state). Therefore, even when switching from the shooting preparation state (LV state and S1 state) back to the shooting state (S2 state), shooting can be started without changing the servo control characteristics, making it possible to start shooting without a release time lag. Furthermore, when the shooting preparation state (LV state and S1 state) is released and the camera switches to the shooting standby state (LV state and S1 released state), it becomes possible to maintain the quietness of the shooting standby state again by switching from the second servo control characteristic 22b to the first servo control characteristic 22a.

[0056] Regarding the target generation unit, as in the conventional method, when changing from the second target generation characteristic 21b to the first target generation characteristic 21a, the change is not made all at once, but rather gradually switched to the first target generation characteristic. If the system enters the shooting state (S2 state) again during this process, it switches back to the second target generation characteristic 21b.

[0057] As explained with reference to Figure 2, the determination methods for the shooting preparation state determination means 17, the shooting start state determination means 18, and the shooting completion state determination means 19 are not limited to the methods described above, but may be other methods. In this embodiment, the shooting preparation state determination means 17 was described using a method that determines whether shooting preparation has started by determining the half-press state (S1) of the shutter release button. However, the determination method for the shooting preparation state determination means 17 may also be determined by the AE (measuring) start timing or the AF (focusing) start timing, in addition to the half-press state of the shutter release button.

[0058] For example, consider a case where the camera body 1 is equipped with a metering means, and the AE (metering) start timing is used as the shooting readiness state determination means 17. In this case, at the start of shooting, the state of the camera body 1 is assumed to have changed from the shooting standby state to the shooting readiness state due to the AE start operation, and the servo control characteristic is changed from the first servo control characteristic 22a to the second servo control characteristic 22b. At the end of shooting, the state of the camera body 1 is assumed to have ended the shooting readiness state and changed to the shooting standby state, such as when the AE lock is terminated or when no period input is received after the AE operation has been performed, and the servo control characteristic is changed from the second servo control characteristic 22b to the first servo control characteristic 22a.

[0059] Furthermore, the camera body 1 may be equipped with a distance measuring means, and the AF (distance measuring) start timing may be used as the shooting preparation state determination means 17. In that case, at the start of shooting, the state of the camera body 1 is considered to have changed from the shooting standby state to the shooting preparation state due to the AF start operation, and the servo control characteristic is changed from the first servo control characteristic 22a to the second servo control characteristic 22b. At the end of shooting, the shooting preparation state is considered to have ended and the state of the camera body 1 has changed to the shooting standby state, such as when AF tracking is completed or when no period input is received after AF operation, and the servo control characteristic is changed from the second servo control characteristic 22b to the first servo control characteristic 22a. Alternatively, if the AF mode is servo AF mode, the system may determine that the camera is in the shooting preparation state during the period of AF operation, and maintain the second servo control characteristic 22b during the AF operation period, or use other methods to change the servo control characteristics.

[0060] (Explanation of switching the characteristics of the servo control unit using a method other than S1) Figure 6(a) illustrates an example where the camera body 1 transitions from the shooting standby state (LV state) to the shooting preparation state (S1 state) and then to the shooting state (S2 state). However, there are also cases where the camera transitions directly from the shooting standby state (LV state) to the shooting state (S2 state). That is, when the user fully presses the shutter release button in one swift motion, the exposure of the image sensor 6 begins immediately from the shooting standby state (LV state). In such cases, several methods can be considered for changing the target generation characteristics and servo control characteristics.

[0061] One possible method is to start exposure of the image sensor 6 as soon as the state of the camera body 1 changes to the shooting state (S2 state). In this case, the servo control unit 22 maintains the first servo control characteristic 22a even after exposure of the image sensor 6 begins, and at the same time, the target generation unit 21 changes the target generation characteristic from the first target generation characteristic 21a to the second target generation characteristic 21b. After that, when shooting is completed, the shooting preparation state determination means 17 determines whether the shooting preparation state is still in effect, and if the shooting preparation state is maintained, the servo control unit 22 operates to change the servo control characteristic from the first servo control characteristic 22a to the second servo control characteristic 22b.

[0062] The second method prioritizes image stabilization performance and changes to servo control characteristics, even if it results in a release time lag. When the state of the camera body 1 changes to the shooting state (S2 state), it is assumed that it has simultaneously changed to the shooting preparation state (S1 state), and the servo control unit 22 changes the servo control characteristics from the first servo control characteristics 22a to the second servo control characteristics 22b. At the same time, the target generation unit 21 changes the target generation characteristics from the first target generation characteristics 21a to the second target generation characteristics 21b. In this case, if a small movement is likely to occur in the image stabilization means 14 due to the change in servo control characteristics, the exposure of the image sensor 6 is started after a short delay following the change in servo control characteristics. After shooting is completed, the shooting preparation state determination means 17 determines whether the shooting preparation state is still in effect, and if the shooting preparation state is maintained, the servo control characteristics operate to maintain the second servo control characteristics.

[0063] Alternatively, the user may be able to select between the first and second methods. For example, the system may have control characteristic selection means (not shown) that allows the user to select control characteristics, and the user may choose between prioritizing the speed of exposure start of the image sensor 6 (first method) and prioritizing blur correction performance (second method). In other words, the first and second methods may be changed according to the user's selection (setting).

[0064] Furthermore, the camera body 1 may be equipped with a shutter speed selection means, and the first method and the second method may be changed according to the shutter speed set by the shutter speed selection means. For example, when the shutter speed is fast, the first method may be adopted to prioritize minimizing the release time lag, and when the shutter speed is slow, the second method may be adopted to prioritize image stabilization performance even if some release time lag occurs. Conversely, when the shutter speed is fast, high-frequency blur becomes dominant in the captured image, so the second method may be adopted to prioritize changing the servo control characteristics in order to suppress the occurrence of high-frequency blur. In that case, when the shutter speed is slow, the camera will operate to adopt the first method, assuming that high-frequency blur does not appear much in the image.

[0065] (Explanation of the timing for switching servo control characteristics) Figures 6(a) and 6(b) illustrate how the servo control unit 22 switches the servo control characteristics according to the determination result of the shooting preparation state determination means 17. However, when switching the servo control characteristics, the servo control unit 22 may also refer to the position information of the image stabilization means 14. In other words, the servo control unit 22 may use the position information of the image stabilization means 14 to decide whether or not to switch the first servo control characteristic 22a to the second servo control characteristic 22b.

[0066] As mentioned above, when the servo control characteristics are changed in the servo control unit 22, the image stabilization means 14 may move slightly, which may affect the image. If this happens at the start of exposure, it will affect the captured image as slight blurring. However, if this slight blurring occurs when transitioning to the shooting preparation state, the live view image may move slightly in a short period of time. This can lead to quality problems such as poor visibility of the live view image. For this reason, it is preferable that the image stabilization means 14 does not move slightly when changing the servo control characteristics.

[0067] Minor movements when changing servo control characteristics may occur when there is a large difference between the target signal generated by the target generation unit 21 and the position of the shake correction means 14 controlled by the servo control unit 22. This is because a control amount proportional to the difference between the target signal generated by the target generation unit 21 and the position signal of the shake correction means 14 is input to the actuator as the control amount of the shake correction means 14, and servo control is performed.

[0068] Therefore, the image stabilization means 14 has a position detection means and acquires position information of the image stabilization means 14. In addition to the determination result of the shooting preparation state determination means 17, it is preferable to switch the servo control characteristics of the servo control unit 22 according to the output of the position detection means of the image stabilization means 14.

[0069] Specifically, the system references the target signal generated by the target generation unit 21 and the position information signal of the shake correction means 14, which is controlled by the servo control unit 22, obtained from the shake correction means position detection means. When the difference between the target signal and the position information signal is smaller than a predetermined value, the servo control characteristics of the servo control unit 22 are switched. In other words, the system compares the target signal of the shake correction means 14, which is determined from the first target generation characteristic 21a or the second target generation characteristic 21b, with the output of the shake correction means position detection means, and switches the servo control characteristics when the difference is smaller than a predetermined value. By doing so, it is possible to suppress the occurrence of minute movements of the shake correction means 14 when changing the servo control characteristics, and to change the servo control characteristics with good quality.

[0070] (Explanation of the control method) Next, with reference to Figure 7, the control method of the imaging system 100 in this embodiment will be described. Figure 7 is a flowchart of the control method in this embodiment. This flow starts when the power to the camera body 1 is turned on.

[0071] First, in step S7001, the camera system control unit 5 puts the camera body 1 into a shooting standby state. In the shooting standby state, it is in a so-called live view state, and the image captured by the image sensor 6 is displayed in real time on the display means 10.

[0072] Next, in step S7002, the camera system control unit 5 uses the image stabilization control means 16 to set the target generation characteristics of the target generation unit 21 to the first target generation characteristics 21a. Next, in step S7003, the camera system control unit 5 uses the image stabilization control means 16 to set the servo control characteristics of the servo control unit 22 to the first servo control characteristics 22a.

[0073] Next, in step S7004, the camera system control unit 5 uses the shooting preparation state determination means 17 to determine whether or not the user has input a shooting preparation start instruction (so-called half-press of the shutter release button, S1). If it is determined that the system is in a shooting preparation state, the system proceeds to step S7005. On the other hand, if it is determined that the system is in a shooting preparation state, the system waits and repeats the determination in step S7004.

[0074] In step S7005, the camera system control unit 5 uses the image stabilization control means 16 to set the servo control characteristics of the servo control unit 22 to the second servo control characteristics 22b. Subsequently, in step S7006, the camera system control unit 5 uses the shooting start state determination means 18 to determine whether or not a shooting start instruction (so-called full press of the shutter release button, S2) has been input by the user. If it is determined that the shooting start state has been reached, the process proceeds to step S7007. On the other hand, if it is determined that the shooting start state has not been reached, the process proceeds to step S7012.

[0075] In step S7007, the camera system control unit 5 uses the image stabilization control means 16 to set the target generation characteristics of the target generation unit 21 to the second target generation characteristics 21b. Subsequently, in step S7008, the camera system control unit 5 starts exposure using the image sensor 6. Subsequently, in step S7009, the camera system control unit 5 uses the shooting completion status determination means 19 to determine whether or not exposure by the image sensor 6 has been completed. If it is determined that exposure has been completed, the process proceeds to step S7010. On the other hand, if it is determined that exposure has not been completed, the process waits and repeats the determination in step S7009.

[0076] In step S7010, the camera system control unit 5 uses the image stabilization control means 16 to gradually switch the target generation characteristics of the target generation unit 21 from the second target generation characteristics 21b to the first target generation characteristics 21a. Subsequently, in step S7011, the camera system control unit 5 uses the image stabilization control means 16 to maintain the servo control characteristics of the servo control unit 22 at the second servo control characteristics 22b.

[0077] Next, in step S7012, the camera system control unit 5 uses the shooting preparation state determination means 17 to determine whether the user has entered the shooting preparation state (so-called half-press release of the shutter release button, S1 release). If it is determined that the system is in the shooting preparation state, the system proceeds to step S7013. On the other hand, if it is determined that the system is not in the shooting preparation state, the system returns to step S7006.

[0078] In step S7013, the camera system control unit 5 uses the image stabilization control means 16 to switch the servo control characteristics of the servo control unit 22 to the first servo control characteristics 22a. Subsequently, in step S7014, the camera system control unit 5 determines whether or not to end shooting based on user input, etc. If it is determined that shooting should be ended, this flow ends. On the other hand, if it is determined that shooting should not be ended, the process returns to step S7001.

[0079] Although Figure 7 describes the camera system control unit 5 controlling the imaging system 100 in each control flow, this embodiment is not limited to this. For example, the lens system control unit 13 may control the imaging system 100 in each control flow.

[0080] Furthermore, although the image stabilization means 14 described as the control target in this embodiment is provided on the camera body 1, this embodiment is not limited to this. The image stabilization means may be provided on, for example, the lens device 2, or on both the camera body 1 and the lens device 2. When the image stabilization means is provided on the lens device 2, the target of the control flow described with reference to Figure 7 is the image stabilization means provided on the lens device 2. Also, when image stabilization means are provided on both the camera body 1 and the lens device 2, the target of the control flow described with reference to Figure 7 is at least one of the image stabilization means of both.

[0081] As described above, the control device (camera system control unit 5) of this embodiment has a target generation unit 21 and a servo control unit 22. The target generation unit 21 generates a target (control target value) for blur correction using a signal acquired from the blur detection means 15. The servo control unit 22 calculates the control amount of the blur correction means 14 that performs blur correction based on the target. The target generation unit 21 has a first target generation characteristic 21a and a second target generation characteristic 21b that calculates a correction amount that can correct low-frequency blur compared to the first target generation characteristic 21a. The servo control unit 22 has a first servo control characteristic 22a and a second servo control characteristic 22b that has higher responsiveness compared to the first servo control characteristic 22a. When the shooting state transitions from the shooting preparation state to the shooting start state, the target generation unit 21 switches the first target generation characteristic 21a to the second target generation characteristic 21b. The servo control unit 22 switches the first servo control characteristic 22a to the second servo control characteristic 22b when the shooting state transitions from the shooting standby state to the shooting preparation state.

[0082] Alternatively, in the control device of this embodiment, the target generation unit 21 gradually switches the second target generation characteristic 21b to the first target generation characteristic 21a when the shooting state transitions from the shooting start state to the shooting completion state. The servo control unit 22 maintains the second servo control characteristic 22b while the shooting state is in the shooting preparation state.

[0083] Preferably, the first servo control characteristic 22a and the second servo control characteristic 22b have different gain characteristic inflection frequencies. More preferably, the second servo control characteristic 22b has a higher inflection frequency than the first servo control characteristic 22a.

[0084] Preferably, the second servo control characteristic 22b has less phase delay compared to the first servo control characteristic 22a. Also preferably, the first target generation characteristic 21a has less gain in the low-frequency band compared to the second target generation characteristic 21b. Also preferably, the shooting preparation state is when the shutter release button is half-pressed, when the photometering means is performing a photometering operation, or when the distance measuring means is performing a distance measuring operation.

[0085] As described above, in this embodiment, the target generation characteristics and servo control characteristics are changed according to the determination results of the shooting preparation state determination means 17, the shooting start state determination means 18, and the shooting completion state determination means 19. This makes it possible to quietly operate the image stabilization means during periods when there is no intention to shoot, while simultaneously capturing images with high image stabilization performance immediately after shooting begins. [Examples]

[0086] Next, Embodiment 2 of the present invention will be described. In this embodiment, the case where the shooting mode of the imaging system 100 is continuous shooting mode will be described. In this embodiment, the basic configuration of the imaging system 100 is the same as that of Embodiment 1, which was described with reference to Figures 1 and 2, so only the parts that differ from Embodiment 1 will be described, and the descriptions common to Embodiment 1 will be omitted.

[0087] Next, referring to Figures 8(a) and 9(a) and 9(b), the switching methods for the target generation unit 21 and the servo control unit 22 when set to continuous shooting mode will be explained. Figures 8(a) and 8(b) are explanatory diagrams of the switching of the series of target generation characteristics and servo control characteristics from the start to the completion of shooting in continuous shooting mode in the conventional manner. Similar to Figures 5(a) and 5(b), Figures 8(a) and 8(b) show the changes in the state of the camera body 1, the changes in the characteristics of the target generation unit, and the changes in the characteristics of the servo control unit as time progresses from left to right, with time t on the horizontal axis.

[0088] Similar to the cases in Figures 5(a) and (b), conventionally, the target generation characteristics and servo control characteristics are switched only by a change in state, whether or not the shooting state (exposure state of the image sensor 6) is in or out. Therefore, as shown in Figures 8(a) and (b), the target generation characteristics and servo control characteristics are not switched when changing from the shooting standby state (so-called live view state) to the shooting preparation state (S1 state). In other words, image stabilization control is performed using the first target generation characteristics and the first servo control characteristics. Subsequently, at the timing of switching to the shooting state (S2 state), the second target generation characteristics and the second servo control characteristics are switched to perform image stabilization control during exposure. When changing the servo control characteristics, the image stabilization means 14 may unintentionally move slightly due to the change in control, and as a result, the slight movement of the image stabilization means 14 affects the captured image, causing slight blurring.

[0089] Upon completion of continuous shooting, at the moment the shooting state (S2 state) is completed, the second target generation characteristic switches to the first target generation characteristic, and the second servo control characteristic switches to the first servo control characteristic. Note that, in the case of the target generation unit, when changing from the second target generation characteristic to the first target generation characteristic, the change is not made abruptly, but rather a gradual and smooth transition is sometimes employed.

[0090] Figures 9(a) and 9(b) are explanatory diagrams illustrating the switching of target generation characteristics and servo control characteristics in this embodiment, from the start of shooting to the completion of shooting in continuous shooting mode. Similar to Figures 6(a) and 6(b), Figures 9(a) and 9(b) have time t on the horizontal axis and show the changes in the state of the camera body 1, the changes in the characteristics of the target generation unit, and the changes in the characteristics of the servo control unit as time progresses from left to right.

[0091] In this embodiment, the target generation characteristics and servo control characteristics are switched according to the change in the shooting state determined by the shooting preparation state determination means 17, the shooting start state determination means 18, and the shooting completion state determination means 19. As shown in Figures 9(a) and (b), at the start of shooting, when the state changes from the shooting standby state (LV state) to the shooting preparation state (S1 state), it is determined that there is an intention to shoot, and first, the servo control characteristics are switched from the first servo control characteristics 22a to the second servo control characteristics 22b. After that, when the state changes to the shooting state (S2 state), the target generation characteristics are switched from the first target generation characteristics 21a to the second target generation characteristics 21b.

[0092] In this way, by switching the target generation characteristics and servo control characteristics, it is possible to maintain quietness in the shooting standby state (LV state). Furthermore, in the shooting preparation state (S1), the first target generation characteristic 21a is used, so it does not interfere with the user's framing operation (low-frequency camera shake is not corrected). Moreover, since the second servo control characteristic 22b is used, camera shake that needs to be eliminated (high-frequency camera shake) is corrected even in the shooting preparation state, making it possible to provide comfortable framing operation. Furthermore, in the shooting state (S2 state), the second target generation characteristic 21b is used, so it becomes possible to correct even low-frequency camera shake effectively. At the same time, since the servo control characteristics have already been switched to the second servo control characteristic 22b, the minute movements of the shake correction means 14 will not affect the captured image due to the change in servo control characteristics, and minute shakes will not occur.

[0093] Upon completion of shooting, at the moment when the shooting state (S2 state) is completed and the state changes to the shooting preparation state (LV state and S1 state), the system first switches from the second target generation characteristic 21b to the first target generation characteristic 21a. Subsequently, when the shooting preparation state (LV state and S1 state) is released and the system switches to the shooting standby state (LV state and S1 release state), it is determined that there is no longer an intention to shoot, and the system switches from the second servo control characteristic 22b to the first servo control characteristic 22a.

[0094] In this way, by switching the target generation characteristics and servo control characteristics, it becomes possible to maintain the second servo control characteristic 22b even after shooting is complete, as long as the shutter release button remains in a half-pressed state (LV state and S1 state). Therefore, even when switching from the shooting preparation state (LV state and S1 state) back to the shooting state (S2 state), shooting can be started without changing the servo control characteristics, making it possible to start shooting without a release time lag. Furthermore, when the shooting preparation state (LV state and S1 state) is released and the camera switches to the shooting standby state (LV state and S1 released state), it becomes possible to maintain the quietness of the shooting standby state again by switching from the second servo control characteristic 22b to the first servo control characteristic 22a.

[0095] Regarding the target generation unit, as in the conventional method, when changing from the second target generation characteristic 21b to the first target generation characteristic 21a, the change is not made all at once, but rather gradually switched to the first target generation characteristic 21a. If the system enters the shooting state (S2 state) again during this process, it switches back to the second target generation characteristic 21b.

[0096] Next, with reference to Figure 10, the control method of the imaging system 100 in this embodiment will be described. Figure 10 is a flowchart of the control method in this embodiment. This flow starts when the power to the camera body 1 is turned on. In Figure 10, the basic control flow is the same as the control flow in the single-shot shooting mode shown in Figure 7 of Embodiment 1, so the same control flow as in Figure 7 is given the same step numbers (S7001~S7005, S7010~S7014). Here, only the control flow that differs from Figure 7 will be described, and the explanation common to Figure 7 will be omitted.

[0097] In step S10001, the camera system control unit 5 uses the shooting start state determination means 18 to determine whether or not the user has input a continuous shooting start instruction (so-called full press of the shutter release button, S2) (whether or not the continuous shooting start state is in effect). If it is determined that the continuous shooting start state is in effect, the process proceeds to step S10002. On the other hand, if it is determined that the continuous shooting start state is not in effect, the process proceeds to step S7012.

[0098] In step S10002, the camera system control unit 5 uses the image stabilization control means 16 to set the target generation characteristics of the target generation unit 21 to the second target generation characteristics 21b. Next, in step S10003, the camera system control unit 5 starts continuous shooting using the image sensor 6. Next, in step S10004, the camera system control unit 5 uses the shooting completion state determination means 19 to determine whether the continuous shooting state (S2 release state) has been released by the user (whether or not it is in the continuous shooting completion state). If it is determined that it is in the continuous shooting completion state, the system proceeds to step S7010. On the other hand, if it is determined that it is not in the continuous shooting completion state, the system returns to step S10003, and the camera system control unit 5 continues continuous shooting.

[0099] The subsequent flow proceeds in the same manner as shown in Figure 7. In step S7010, the camera system control unit 5 uses the image stabilization control means 16 to gradually switch the target generation characteristics of the target generation unit 21 from the second target generation characteristics 21b to the first target generation characteristics 21a. Subsequently, in step S7011, the camera system control unit 5 uses the image stabilization control means 16 to maintain the servo control characteristics of the servo control unit 22 at the second servo control characteristics 22b. Subsequently, in step S7012, the camera system control unit 5 uses the shooting preparation state determination means 17 to determine whether the shooting preparation state (S1 state) has been released. If it is determined that the shooting preparation state has been released, the process proceeds to step S7013. On the other hand, if it is determined that the shooting preparation state has not been released, the process returns to step S10001, and the camera system control unit 5 uses the shooting start state determination means 18 to determine whether it is in the continuous shooting start state (S2). From step S7013 onward, the process is the same as the control flow shown in Figure 7.

[0100] As explained above, even in continuous shooting mode, the target generation characteristics and servo control characteristics are changed according to the determination results of the shooting preparation state determination means 17, the shooting start state determination means 18, and the shooting completion state determination means 19. This makes it possible to quietly operate the image stabilization means during periods when there is no intention to shoot, while simultaneously capturing images with high image stabilization performance immediately after shooting begins.

[0101] (Other examples) The present invention can also be realized by supplying a program that implements one or more of the functions of the above-described embodiments to a system or device via a network or storage medium, and by having one or more processors in the computer of that system or device read and execute the program. It can also be realized by a circuit (e.g., an ASIC) that implements one or more functions.

[0102] According to each embodiment, it is possible to provide a control device, imaging device, lens device, control device, and program that can reduce the driving noise of the image stabilization means without degrading the image stabilization performance.

[0103] Each embodiment's disclosure includes the following configuration and method. (Composition 1) A correction amount calculation means calculates a correction amount for blur correction using a signal acquired from a blur detection means, The system includes a control means for controlling the shake correction means that performs shake correction based on the correction amount and control characteristics, The correction amount calculation means has a first calculation characteristic and a second calculation characteristic that calculates the correction amount capable of correcting low-frequency fluctuations compared to the first calculation characteristic, The control means has, as control characteristics, a first control characteristic and a second control characteristic which has higher responsiveness compared to the first control characteristic. When transitioning to the first state, second state, and third state in order according to user instructions, The correction amount calculation means switches the first calculation characteristic to the second calculation characteristic when transitioning from the second state to the third state. The control means is characterized by switching the first control characteristic to the second control characteristic when transitioning from the first state to the second state. (Configuration 2) When transitioning to the first state, second state, third state, and fourth state in order according to user instructions, The correction amount calculation means, when transitioning from the third state to the fourth state, gradually switches the second calculation characteristic to the first calculation characteristic. The control device according to configuration 1, characterized in that the control means maintains the second control characteristics while in the second state. (Composition 3) A correction amount calculation means calculates a correction amount for blur correction using a signal acquired from a blur detection means, The system includes a control means for controlling the shake correction means that performs shake correction based on the correction amount and control characteristics, The correction amount calculation means has a first calculation characteristic and a second calculation characteristic that calculates the correction amount capable of correcting low-frequency fluctuations compared to the first calculation characteristic, The control means has, as control characteristics, a first control characteristic and a second control characteristic which has higher responsiveness compared to the first control characteristic. When transitioning to the second, third, and fourth states in order according to user instructions, The correction amount calculation means, when transitioning from the third state to the fourth state, gradually switches the second calculation characteristic to the first calculation characteristic. The control means is characterized by maintaining the second control characteristic while in the second state. (Composition 4) The control device according to any one of configurations 1 to 3, characterized in that the first control characteristic and the second control characteristic have different inflection frequencies of the gain characteristics. (Composition 5) The control device according to configuration 4, characterized in that the second control characteristic has a higher inflection frequency compared to the first control characteristic. (Composition 6) The control device according to any one of configurations 1 to 5, characterized in that the second control characteristic has less phase delay compared to the first control characteristic. (Composition 7) The control device according to any one of configurations 1 to 6, characterized in that the first calculation characteristic has a reduced gain in the low-frequency band compared to the second calculation characteristic. (Composition 8) When transitioning from the first state to the third state, The correction amount calculation means switches the first calculation characteristic to the second calculation characteristic, The control device according to configuration 1 or 2, characterized in that the control means maintains the first control characteristics. (Composition 9) When transitioning from the first state to the third state, The correction amount calculation means switches the first calculation characteristic to the second calculation characteristic, The control device according to configuration 1 or 2, characterized in that the control means switches the first control characteristic to the second control characteristic. (Composition 10) When transitioning from the first state to the third state, The correction amount calculation means switches the first calculation characteristic to the second calculation characteristic, The control device according to configuration 1 or 2, characterized in that the control means changes whether to maintain the first control characteristic or switch the first control characteristic to the second control characteristic according to the user's settings. (Composition 11) When transitioning from the first state to the third state, The correction amount calculation means switches the first calculation characteristic to the second calculation characteristic, The control device according to configuration 1 or 2, characterized in that the control means changes whether to maintain the first control characteristic or switch the first control characteristic to the second control characteristic according to the shutter speed. (Composition 12) The control device according to any one of configurations 1 to 11, characterized in that the control means determines whether or not to switch the first control characteristic to the second control characteristic using the position information of the blur correction means. (Composition 13) The control device according to any one of configurations 1 to 12, characterized in that the second state is a state in which a photometric operation is being performed by the photometric means. (Composition 14) The control device according to any one of configurations 1 to 12, characterized in that the second state is a state in which a distance measuring operation is being performed by the distance measuring means. (Composition 15) An imaging device characterized by having a control device according to any one of configurations 1 to 15 and an image sensor. (Composition 16) The imaging device according to configuration 15, characterized in that the second state is a state in which the shutter release button of the imaging device is half-pressed. (Composition 17) The imaging device according to configuration 16, characterized in that the third state is a state in which shooting has started in response to the shutter release button being fully pressed. (Composition 18) The imaging device according to configuration 17, characterized in that when transitioning to the first state, second state, third state, and fourth state in order according to user instructions, the fourth state is a state in which shooting has been completed in response to the shutter release button being fully pressed. (Composition 19) The imaging device according to any one of configurations 16 to 18, characterized in that when transitioning to a first state, a second state, and a third state in order according to user instructions, the first state is a state in which a live view image is displayed on the display unit but the shutter release button is not half-pressed. (Composition 20) A lens device comprising a control device according to any one of configurations 1 to 14 and an imaging optical system, characterized in that it is detachable from an imaging device. (Composition 21) The lens device according to configuration 20, characterized in that the second state is a state in which the shutter release button of the imaging device is half-pressed. (Composition 22) The lens device according to configuration 21, characterized in that the third state is a state in which shooting has started in response to the shutter release button being fully pressed. (Composition 23) The lens device according to configuration 22, characterized in that when transitioning to the first state, second state, third state, and fourth state in order according to user instructions, the fourth state is a state in which shooting has been completed in response to the shutter release button being fully pressed. (Composition 24) The lens device according to configuration 23, characterized in that the first state is a state in which a live view image is displayed on the display but the shutter release button is not half-pressed. (Method 1) The first step involves calculating a correction amount for shake correction based on the signal obtained from the shake detection means, The system includes a second step of controlling the shake correction means that performs the shake correction based on the correction amount and control characteristics, The first step includes a first calculation characteristic for calculating the correction amount, and a second calculation characteristic for calculating the correction amount that can correct low-frequency vibrations compared to the first calculation characteristic. The control characteristics include a first control characteristic and a second control characteristic that has higher responsiveness compared to the first control characteristic. When transitioning to the first state, second state, and third state in order according to user instructions, When transitioning from the second state to the third state, in the first step, the system switches from the first arithmetic characteristic to the second arithmetic characteristic. A control method characterized in that, when transitioning from the first state to the second state, the second step involves switching from the first control characteristic to the second control characteristic. (Method 2) The first step involves calculating a correction amount for shake correction based on the signal obtained from the shake detection means, The system includes a second step of controlling the shake correction means that performs the shake correction based on the correction amount and control characteristics, The first step includes a first calculation characteristic for calculating the correction amount, and a second calculation characteristic for calculating the correction amount that can correct low-frequency vibrations compared to the first calculation characteristic. The control characteristics include a first control characteristic and a second control characteristic that has higher responsiveness compared to the first control characteristic. When transitioning to the second, third, and fourth states in order according to user instructions, When transitioning from the third state to the fourth state, in the first step, gradually switch from the second arithmetic characteristic to the first arithmetic characteristic, A control method characterized in that the second control characteristic is maintained in the second step while the second state is in place. (Composition 25) A program characterized by causing a computer to execute the control method described in Method 1 or 2.

[0104] Although 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 its gist. [Explanation of Symbols]

[0105] 5. Camera System Control Unit (Control Device) 14 Image stabilization means 15. Blur detection means 21 Target generation unit (correction amount calculation means) 21a First target generation characteristics (first operation characteristics) 21b Second target generation characteristics (second operation characteristics) 22 Servo control unit (control means) 22a First servo control characteristics (first control characteristics) 22b Second Servo Control Characteristics (Second Control Characteristics)

Claims

1. A correction amount calculation means calculates a correction amount for blur correction using a signal acquired from a blur detection means, The system includes a control means for controlling the shake correction means that performs shake correction based on the correction amount and control characteristics, The correction amount calculation means has a first calculation characteristic and a second calculation characteristic that calculates the correction amount capable of correcting low-frequency fluctuations compared to the first calculation characteristic, The control means has, as control characteristics, a first control characteristic and a second control characteristic which has higher responsiveness compared to the first control characteristic. When transitioning to the first state, second state, and third state in order according to user instructions, The correction amount calculation means switches the first calculation characteristic to the second calculation characteristic when transitioning from the second state to the third state. The control means is characterized in that when transitioning from the first state to the second state, the control device switches the first control characteristic to the second control characteristic.

2. When transitioning to the first state, second state, third state, and fourth state in order according to user instructions, The correction amount calculation means, when transitioning from the third state to the fourth state, gradually switches the second calculation characteristic to the first calculation characteristic. The control device according to claim 1, characterized in that the control means maintains the second control characteristics while in the second state.

3. A correction amount calculation means calculates a correction amount for blur correction using a signal acquired from a blur detection means, The system includes a control means for controlling the shake correction means that performs shake correction based on the correction amount and control characteristics, The correction amount calculation means has a first calculation characteristic and a second calculation characteristic that calculates the correction amount capable of correcting low-frequency fluctuations compared to the first calculation characteristic, The control means has, as control characteristics, a first control characteristic and a second control characteristic which has higher responsiveness compared to the first control characteristic. When transitioning to the second, third, and fourth states in order according to user instructions, The correction amount calculation means, when transitioning from the third state to the fourth state, gradually switches the second calculation characteristic to the first calculation characteristic. The control device is characterized in that the control means maintains the second control characteristics while the second state is in place.

4. The control device according to any one of claims 1 to 3, characterized in that the first control characteristic and the second control characteristic have different inflection frequencies of the gain characteristics.

5. The control device according to claim 4, characterized in that the second control characteristic has a higher inflection frequency compared to the first control characteristic.

6. The control device according to any one of claims 1 to 3, characterized in that the second control characteristic has less phase delay compared to the first control characteristic.

7. The control device according to any one of claims 1 to 3, characterized in that the first calculation characteristic has a reduced gain in the low-frequency band compared to the second calculation characteristic.

8. When transitioning from the first state to the third state, The correction amount calculation means switches the first calculation characteristic to the second calculation characteristic, The control device according to claim 1, characterized in that the control means maintains the first control characteristics.

9. When transitioning from the first state to the third state, The correction amount calculation means switches the first calculation characteristic to the second calculation characteristic, The control device according to claim 1, characterized in that the control means switches the first control characteristic to the second control characteristic.

10. When transitioning from the first state to the third state, The correction amount calculation means switches the first calculation characteristic to the second calculation characteristic, The control device according to claim 1, characterized in that the control means changes whether to maintain the first control characteristic or switch the first control characteristic to the second control characteristic according to the user's settings.

11. When transitioning from the first state to the third state, The correction amount calculation means switches the first calculation characteristic to the second calculation characteristic, The control device according to claim 1, characterized in that the control means changes whether to maintain the first control characteristic or switch the first control characteristic to the second control characteristic according to the shutter speed.

12. The control device according to any one of claims 1 to 3, characterized in that the control means determines whether or not to switch the first control characteristic to the second control characteristic using the position information of the blur correction means.

13. The control device according to any one of claims 1 to 3, characterized in that the second state is a state in which a photometric operation is being performed by the photometric means.

14. The control device according to any one of claims 1 to 3, characterized in that the second state is a state in which a distance measuring operation is being performed by the distance measuring means.

15. An imaging device comprising a control device according to any one of claims 1 to 3 and an image sensor.

16. The imaging device according to claim 15, characterized in that the second state is a state in which the shutter release button of the imaging device is half-pressed.

17. The imaging device according to claim 16, characterized in that the third state is a state in which shooting has started in response to the shutter release button being fully pressed.

18. The imaging device according to claim 17, characterized in that when transitioning to the second state, the third state, and the fourth state in that order according to the user's instructions, the fourth state is a state in which shooting has been completed in response to the shutter release button being fully pressed.

19. The imaging device according to claim 16, characterized in that when transitioning to a first state, a second state, and a third state in order according to user instructions, the first state is a state in which a live view image is displayed on the display unit but the shutter release button is not half-pressed.

20. A lens device comprising a control device according to any one of claims 1 to 3 and an imaging optical system, characterized in that it is detachable from an imaging device.

21. The lens device according to claim 20, characterized in that the second state is a state in which the shutter release button of the imaging device is half-pressed.

22. The lens device according to claim 21, characterized in that the third state is a state in which shooting has started in response to the shutter release button being fully pressed.

23. The lens device according to claim 22, characterized in that when transitioning to the second state, the third state, and the fourth state in that order according to the user's instructions, the fourth state is a state in which shooting has been completed in response to the shutter release button being fully pressed.

24. The lens device according to claim 23, characterized in that the first state is a state in which a live view image is displayed on the display but the shutter release button is not half-pressed.

25. The first step involves calculating a correction amount for shake correction based on the signal obtained from the shake detection means, The system includes a second step of controlling the shake correction means that performs the shake correction based on the correction amount and control characteristics, The first step includes a first calculation characteristic for calculating the correction amount, and a second calculation characteristic that calculates the correction amount capable of correcting low-frequency vibrations compared to the first calculation characteristic. The control characteristics include a first control characteristic and a second control characteristic that has higher responsiveness compared to the first control characteristic. When transitioning to the first state, second state, and third state in order according to user instructions, When transitioning from the second state to the third state, in the first step, the system switches from the first arithmetic characteristic to the second arithmetic characteristic. A control method characterized in that, when transitioning from the first state to the second state, the second step involves switching from the first control characteristic to the second control characteristic.

26. The first step involves calculating a correction amount for shake correction based on the signal obtained from the shake detection means, The system includes a second step of controlling the shake correction means that performs the shake correction based on the correction amount and control characteristics, The first step includes a first calculation characteristic for calculating the correction amount, and a second calculation characteristic that calculates the correction amount capable of correcting low-frequency vibrations compared to the first calculation characteristic. The control characteristics include a first control characteristic and a second control characteristic that has higher responsiveness compared to the first control characteristic. When transitioning to the second, third, and fourth states in order according to user instructions, When transitioning from the third state to the fourth state, in the first step, gradually switch from the second arithmetic characteristic to the first arithmetic characteristic, A control method characterized in that the second control characteristic is maintained in the second step while the second state is in place.

27. A program characterized by causing a computer to execute the control method described in claim 25 or 26.

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