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

Abstract

To provide a control device, an imaging device, a lens device, a control method, and a program, which can easily and satisfactorily correct an image blur at a predetermined image point position including an optical axis center.SOLUTION: A control device includes: first acquisition means for acquiring information on image shift sensitivity to a tilt of an imaging optical system corresponding to an image point position of the imaging optical system on the basis of a design value of the imaging optical system including distortion aberration, and information on a blur; and second acquisition means for acquiring a correction drive amount when correcting an image blur of blur correction means for correcting the image blur. The second acquisition means acquires the correction drive amount corresponding to a predetermined image point position using the information on the image shift sensitivity according to the predetermined image point position, and the information on the blur.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a control device, imaging device, lens device, control method, and program for controlling image blur correction. [Background technology]

[0002] In a central projection optical system, the image point movement on the imaging plane caused by camera shake differs between the center and periphery of the image. As shown in Figure 18(A), the amount of image point movement in the periphery is greater than that in the center of the image. Therefore, even after correcting image blur, the image point remains significantly shifted in the periphery compared to the center, as shown in Figure 18(B). Patent Document 1 discloses an imaging device that corrects image blur at the periphery of the image by considering the difference between the amount of image blur in the center of the image caused by the central projection system and the amount of image blur at a predetermined image point position. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2018-173632 [Overview of the project] [Problems that the invention aims to solve]

[0004] In the imaging device described in Patent Document 1, the correction amount for correcting image blur at a predetermined image point position is calculated using an image height formula for an ideal optical system that does not consider aberrations in the central projection method. Therefore, if image blur correction is performed using an actual optical system in which distortion aberrations remain, based on the correction amount calculated by the above formula, incomplete correction or overcorrection will occur. Furthermore, as shown in Figure 18(B), at image point positions where the direction of image point movement is twisted to the direction of image point movement at the center of the image, image point movement occurs with a different vector than at the center of the image, making it difficult to appropriately calculate the correction amount at such image point positions using only the above formula.

[0005] Furthermore, Patent Document 1 discloses a method for more appropriately correcting image blur by adding the calculated correction amount to the design value information of the optical system's distortion aberration recorded in memory; however, using such a method makes the calculation process complex. Moreover, it remains difficult to calculate the correction amount at the image point position where the image point movement direction is the same as the twisted position of the image point movement direction at the center of the image.

[0006] The present invention aims to provide a control device, imaging device, lens device, control method, and program that can easily and effectively correct image blur at a predetermined image point position including the optical axis center. [Means for solving the problem]

[0007] One aspect of the present invention is a control device. , taken Information regarding the image shift sensitivity to the tilt of the imaging optical system, based on the image point position of the imaging optical system according to the design values ​​of the imaging optical system. Information regarding image shift sensitivity is obtained from a memory means that holds the image shift sensitivity. , and It includes a first acquisition means for acquiring information about blur and a second acquisition means for acquiring the correction drive amount during image blur correction by a blur correction means that corrects image blur. The information regarding image shift sensitivity takes into account the distortion aberration of the imaging optical system. The second acquisition means is characterized by acquiring a correction drive amount corresponding to a predetermined image point position using information on image shift sensitivity corresponding to a predetermined image point position and information on blur. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a control device, imaging device, lens device, control method, and program that can easily and effectively correct image blur at a predetermined image point position including the optical axis center. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram of the imaging system according to the first embodiment. [Figure 2] This is a flowchart showing a control method for acquiring the image blur correction drive amount in the first embodiment. [Figure 3]This figure shows the relationship between image height and tilt-image shift sensitivity in the image point movement direction at the center of the image when the imaging optical system of the first embodiment is tilted. [Figure 4] This figure illustrates the movement of the image point at a predetermined image point position in relation to the movement of the image point at the center of the image when rotational blur occurs around the Y axis in the first embodiment. [Figure 5] (A) is a diagram showing the position of the image point on the imaging plane. (B) is a diagram showing a correction coefficient table containing correction coefficient information corresponding to the position of the image point. [Figure 6] This diagram shows, with arrows, the ratio and direction of the remaining image point movement amount that occurred at each image point when image blur at a predetermined image point position in the first embodiment was corrected by IIS. [Figure 7] This figure shows the relationship between image height and tilt-image shift sensitivity in a direction perpendicular to the image point movement direction at the center of the image when the imaging optical system of the second embodiment is tilted. [Figure 8] This figure shows the ratio and direction of the remaining image point displacement amount at each image point when image blur at the center of the image is corrected by IIS in the second embodiment. [Figure 9] This is a cross-sectional view of the optical system of Example 1 when the object distance is infinity and the system is in focus at the wide-angle end. [Figure 10] This is an aberration diagram of the optical system of Example 1 when the object distance is infinity and the system is in focus at the wide-angle end. [Figure 11] This is a cross-sectional view of the optical system of Example 2 when the object distance is in focus at infinity at the wide-angle end. [Figure 12] This is an aberration diagram of the optical system in Example 2 when the object distance is infinity at the wide-angle end and in focus. [Figure 13] This is a cross-sectional view of the optical system of Example 3 when the object distance is infinity and the system is in focus at the wide-angle end. [Figure 14] This is an aberration diagram of the optical system in Example 3 when the object distance is infinity at the wide-angle end and in focus. [Figure 15] This is a cross-sectional view of the optical system of Example 4 when the object distance is in focus at infinity. [Figure 16]This is an aberration diagram of the optical system in Example 4 when the object distance is in focus at infinity. [Figure 17] This figure shows the ray traces of the principal rays of the d-line, corresponding to each field of view, entering from the object surface in the optical system of Example 1. [Figure 18] Figure 18(A) shows the ratio and direction of image point displacement at each image point on the subject image when image blur occurs in the -X axis direction at the center of the image due to rotational blur. Figure 18(B) shows the ratio and direction of remaining image point displacement at each image point when the image blur at the center of the image in Figure 18(A) is corrected by a sensor-shift type blur correction mechanism, indicated by arrows. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described in detail below with reference to the drawings. In each drawing, the same reference numeral is used for identical components, and redundant descriptions are omitted.

[0011] In the following explanation, in a three-dimensional Cartesian coordinate system (X-axis, Y-axis, and Z-axis), the direction of the longer side of the imaging surface is the X-axis, the direction of the shorter side of the imaging surface is the Y-axis, and the direction of the optical axis of the imaging optical system is the Z-axis. [First Embodiment] Figure 1 is a schematic diagram of the imaging system 1 of this embodiment. The imaging system 1 includes a lens device 100 and an imaging device 200. The lens device 100 includes an imaging optical system 101, a lens-side microcontroller 102, an OIS encoder 103, an OIS driver 104, an OIS actuator 105, and a lens memory (storage means) 106. The imaging device 200 includes an image sensor 201, a camera-side microcontroller 202, a display / operation unit 203, and a recording medium 204. The imaging device 200 also includes a gyro sensor 205, an acceleration sensor 206, an IIS encoder 208, an IIS driver 209, an IIS actuator 210, and a camera memory (storage means) 211. IIS is image shake correction performed by moving the image sensor 201. Furthermore, the lens-side microcontroller 102 and the camera-side microcontroller 202 may be configured as separate control devices from the lens device 100 and the imaging device 200, respectively.

[0012] The imaging optical system 101 includes a focusing optical system 1011, a zoom magnification optical system 1012, an aperture 1013, and a lens-shift type image stabilization optical system (hereinafter referred to as the OIS optical system) 1014. The imaging optical system 101 forms a subject image on the imaging surface of the image sensor 201 using light rays from the subject at the focus position within the set angle of view. The focusing optical system 1011 performs focusing. The zoom magnification optical system 1012 performs zoom magnification to change the shooting angle of view. The aperture 1013 adjusts the amount of light taken in from the subject. The OIS optical system 1014 corrects image blur that occurs during still image or video shooting by being eccentric with respect to the optical axis of the imaging optical system 101. OIS is image blur correction performed by moving the OIS optical system 1014.

[0013] The lens-side microcontroller 102 controls the OIS optical system 1014. Specifically, the lens-side microcontroller 102 determines the OIS drive amount of the OIS actuator 105 using the image blur correction drive amount from the camera-side microcontroller 202 and the position signal from the OIS encoder 103, which detects the position of the OIS optical system 1014. The OIS drive amount is determined so as not to exceed the movable range of the OIS actuator 105. When the OIS actuator 105 receives the OIS drive amount signal from the OIS driver 104, it moves the OIS optical system 1014 in a direction that includes a component perpendicular to the Z-axis direction, thereby eccentricating it with respect to the optical axis of the imaging optical system 101 and correcting image blur. In other words, the OIS actuator 105 functions as one of the blur correction means for correcting image blur.

[0014] The lens memory 106 holds optical design information for the imaging optical system 101. The optical design information includes information on the tilt-image shift sensitivity of the imaging optical system 101 for each image height (information on the image shift sensitivity of the imaging optical system 101 to the tilt according to the image point position of the imaging optical system 101). The information on tilt-image shift sensitivity is obtained using the design values ​​of the imaging optical system 101 and takes into account the distortion aberration of the imaging optical system 101. By using the information on tilt-image shift sensitivity, when rotational blur occurs in the imaging system 1 such that the XY plane perpendicular to the optical axis is tilted with respect to the optical axis, the image blur at a predetermined image point position of the imaging optical system 101 can be well corrected. Alternatively, the camera memory 211 may also hold optical design information for the imaging optical system 101, including information on tilt-image shift sensitivity. Alternatively, both the lens memory 106 and the camera memory 211 may hold optical design information for the imaging optical system 101, including information on tilt-image shift sensitivity.

[0015] The imaging optical system 101 has a distortion aberration DIST(h) expressed by the following formula.

[0016] DIST(h)=(h-h0) / h0 h0 = ftanω Here, f is the focal length of the imaging optical system 101, and ω is the half-angle of view. h is the distance from the optical axis of the imaging optical system 101 to the position on the image plane where the principal ray with half-angle of view ω incident from the object plane forms an image (real image height). h0 is the ideal image height for the central projection method.

[0017] Having distortion means that the amount of distortion at any image height within the imaging range is not zero. Imaging optical systems that have distortion also include those that have a zoom function or a focus function and exhibit distortion in either the zoom state or the focus state.

[0018] The image sensor 201 is composed of a CCD (Charge Coupled Devices) image sensor, a CMOS (Complementary Metal Oxide Semiconductor) image sensor, or another image sensor. The image sensor 201 converts the subject image formed on the imaging surface of the image sensor 201 into an electrical signal by the imaging optical system 101 and outputs it as an image signal. The analog image signal is converted into a digital signal by an A / D converter (not shown) and output.

[0019] The camera-side microcontroller 202 controls the entire imaging system 1. For example, the camera-side microcontroller 202 reads the image signal from the image sensor 201 as image data. The camera-side microcontroller 202 then performs processing such as applying image processing based on optical design information to the image data, displaying the image data on the display / operation unit 203, and saving the image data to the recording medium 204. The camera-side microcontroller 202 also issues instructions to the lens-side microcontroller 102 for focusing, zoom magnification changes, aperture adjustments, etc. for the imaging optical system 101. Some of the settings related to the above processing may be changed by the display / operation unit 203 or by operation units such as buttons (not shown).

[0020] Furthermore, the camera-side microcontroller 202 acquires the image blur correction drive amount (correction drive amount when image blur is corrected by the image blur correction means) according to the flow shown in Figure 2. Figure 2 is a flowchart of the control method for acquiring the image blur correction drive amount by the camera-side microcontroller 202. In the first acquisition step S1, the camera-side microcontroller 202 functions as the first acquisition means and acquires information regarding the image shift sensitivity to the tilt of the imaging optical system 101 according to the image point position of the imaging optical system 101, taking into account the distortion aberration of the imaging optical system 101. Also in the first acquisition step S1, the camera-side microcontroller 202 acquires information regarding blur (also called motion detection signals, for example, the blur angle and acceleration generated in the imaging system 1). In the second acquisition step S2, the camera-side microcontroller 202 functions as the second acquisition means and acquires the image blur correction drive amount corresponding to a predetermined image point position using the information regarding the image shift sensitivity according to a predetermined image point position. The camera-side microcontroller 202 may calculate the image blur correction drive amount, or it may acquire it from a table stored in a server or memory, etc. Furthermore, in this embodiment, the camera-side microcontroller 202 functions as the first acquisition means and the second acquisition means, but the lens-side microcontroller 102 may also function as the first acquisition means and the second acquisition means.

[0021] The gyro sensor 205 outputs information regarding the angular velocity of the imaging system 1 as a motion detection signal. The accelerometer 206 outputs information regarding the translational movement of the imaging system 1 as a motion detection signal. When the camera-side microcontroller 202 receives motion detection signals from each sensor, it sends an image blur correction drive amount to the lens-side microcontroller 102 or the IIS control unit 207 in the camera-side microcontroller 202 to correct the image blur of the subject image in response to the movement of the imaging system 1. When performing image blur correction, either OIS or IIS may be performed, or the division of image blur correction may be decided (for example, 50% correction by OIS and 50% correction by IIS) and both OIS and IIS may be performed.

[0022] The IIS control unit 207 controls the image sensor 201. Specifically, the IIS control unit 207 determines the IIS drive amount of the IIS actuator 210 using the image blur correction drive amount from the camera-side microcontroller 202 and the position signal from the IIS encoder 208, which detects the position of the image sensor 201. The IIS drive amount is determined so as not to exceed the movable range of the IIS actuator 210. When the IIS actuator 210 receives the IIS drive amount signal from the IIS driver 209, it moves the image sensor 201 in a direction that includes a component perpendicular to the Z-axis direction, thereby eccentricating it with respect to the optical axis of the imaging optical system 101 and correcting image blur. In other words, the IIS actuator 210 functions as one of the blur correction means for correcting image blur.

[0023] The lens device 100 may have a gyro sensor 107 and an acceleration sensor 108. In this case, when performing OIS, the lens-side microcontroller 102 can determine the OIS drive amount using the image blur correction drive amount obtained using the motion detection signals output from these sensors and the position signal from the OIS encoder 103.

[0024] The following describes the processing during image blur correction at a predetermined image point position. When the gyro sensor 205 or acceleration sensor 206 detects movement of the imaging system 1, each sensor outputs a motion detection signal (information related to blur) to the camera-side microcontroller 202. The camera-side microcontroller 202 acquires the image blur correction drive amount using the tilt-image shift sensitivity information held by the lens memory 106, the vibration-damping position information on the imaging surface, and the motion detection signal. The camera-side microcontroller 202 transmits the acquired image blur correction drive amount to the lens-side microcontroller 102 or the IIS control unit 207. (Deriving information on tilt-image shift sensitivity) In this embodiment, the tilt-image shift sensitivity is the amount of image point movement in a direction perpendicular to a predetermined rotation axis perpendicular to the optical axis of the imaging optical system 101 when the imaging optical system 101 is tilted with respect to the rotation axis perpendicular to the optical axis of the imaging optical system 101 on the imaging plane. Figure 3 is a diagram showing the relationship between the image height in the direction of image point movement at the center of the image and the tilt-image shift sensitivity (amount of image point movement) when the imaging optical system 101 of this embodiment is tilted. As shown in Figure 3, the amount of image point movement when the imaging optical system 101, which is designed to optically correct aberrations using a central projection method, is tilted increases as the image height increases. In this embodiment, by using the tilt-image shift sensitivity obtained using the design value of the imaging optical system 101, it is possible to derive the amount of image point movement for each image height when rotational blur occurs without performing calculations using the image height formula or distortion aberration amount based on the projection method. In this embodiment, the tilt-image shift sensitivity is the value obtained by dividing the amount of image point movement when the imaging optical system 101 is tilted by 0.5° with respect to a predetermined rotation axis by 0.5°. However, the tilt angle of the imaging optical system 101 is not limited to 0.5° and may be set as appropriate.

[0025] Figure 4 illustrates the movement of the image point at a predetermined position in relation to the movement of the image point at the center of the image when rotational blur occurs around the Y-axis. It schematically shows how a stationary subject image 301 changes into a trapezoidally distorted subject image 302 due to image blur. In wide-angle lenses that optically correct distortion aberration using the central projection method, trapezoidal distortion like that of the subject image 302 becomes large when rotational blur occurs. Image blur occurs when each image point on the imaging plane moves according to the image point movement vector indicated by the arrow.

[0026] Here, the amount of rotational wobble around the Y-axis ω y The amount of image point shift t in the +X axis direction at the center position O of the imaging plane, which is the center of the image, when this occurs. x0 and the amount of image point movement t at the predetermined image point position A. x I will explain this.

[0027] Image point movement amount t x0 When the tilt-image shift sensitivity at image height 0 is denoted by LS, it is expressed by the following equation (1).

[0028] tx0 = ω y · LS(1) Consider the imaging plane (X - Y plane) in a polar coordinate system (R - θ coordinate system) with the center position O as the origin, and let the coordinates of a predetermined image point position A be (r, θ). That is, in this embodiment, the predetermined image point position A is a position on the imaging plane represented by a plurality of parameters. The image height on the horizontal axis of FIG. 3 is the image height h in the R direction in the polar coordinate system of FIG. 4 r is. The image height h r at the inclination - image shift sensitivity is LS r (h r ) When the inclination - image shift sensitivity coefficient k r at the image height h LS_r (h [[ID=1... r ) is represented by the following formula (2).

[0029] k LS_r (h r ) = LS r (h r ) / LS(2) [[ID=... Also, the image point movement amount t x0 is represented by the following formulas (3) to (5) using the parallel component t rx0 parallel to the straight line OA and the perpendicular component t [[ID=3... θX0 perpendicular to the straight line OA.

[0030] t rx0 = t x0 · cosθ = ω y · LS· cosθ(3) t θx0 = t x0 · (- sinθ) = - ω y · LS· sinθ(4) │t x0 │ = (t rx0 2 + t θx0 2 ) 1 / 2 (5) Note that the sign of the parallel component t rx0 is positive in the direction away from the center position O (R direction), and the sign of the perpendicular component t θx0The sign of the function is positive in the direction perpendicular to the R direction (θ direction), which is counterclockwise from the center position O. The R direction and θ direction are also called the meridional direction and sagittal direction, respectively.

[0031] Next, the amount of image point movement t at the predetermined image point position A. x Let's consider the parallel component t parallel to the line OA. rx This is the tilt-image shift sensitivity LS at image height r. r (r) is affected, and the perpendicular component t is perpendicular to the line OA. θx The tilt at image height 0 is affected by the image shift sensitivity LS. From the above, the image point displacement t x The parallel component t rx and the vertical component t θx It can be expressed using the following equations (6) to (8).

[0032] t rx =k LS_r (r)·t rx0 =k LS_r (r)·ω y ·LS·cosθ (6) t θx =k LS_r (0)·t θx0 =-ω y ·LS·sinθ (7) │t x │=( t rx 2 +t θx 2 ) 1 / 2 (8) In this way, the rotational wobble ω around the Y axis y The amount of image point movement t at the predetermined image point position A when this occurs. x This is derived. Similarly, the rotational wobble ω around the X axis is derived. x The amount of image point displacement t at a predetermined image point position A in the polar coordinate system when this occurs. y This is the parallel component t parallel to the straight line OA. ry and the perpendicular component t perpendicular to the line OA θy Using this, it can be expressed by the following equations (9) to (11).

[0033] try =k LS_r (r)·t ry0 =k LS_r (r)·ω x ·LS·sinθ (9) t θy =k LS_r (0)·t θy0 =ω x ·LS·cosθ (10) │t y │=(t ry 2 +t θy 2 ) 1 / 2 (11) As described above, when a rotational blur amount (ω x , ω y ) occurs with respect to a predetermined rotation axis that intersects the optical axis on the imaging surface, the image point movement amount t at a predetermined image point position A is represented by the following equations (12) to (14) using the parallel component t r parallel to the straight line OA and the perpendicular component t θ perpendicular to the straight line OA.

[0034] t r =t rx +t ry =k LS_r (r)·LS(ω y ·cosθ + ω x ·sinθ) =K1(r,θ)·ω y +K2(r,θ)ω x (12) t θ =t θx +t θy =LS(-ω y ·sinθ + ω x ·cosθ) =K3(r,θ)·ω[[ID=8​​​​​​​​​​​​​Here, the coefficients (K1, K2, K3, K4) in equations (12) and (13) are obtained by rearranging the coefficients as follows. K1(r,θ)=k LS_r (r)·LS·cosθ K2(r,θ)=k LS_r (r)·LS·sinθ K3(r,θ)=-LS·sinθ K4(r,θ) = LS·cosθ As shown in equations (12) to (14), the image point displacement amount t is a correction coefficient information (K1, K2, K3, K4) consisting of tilt-image shift sensitivity and position information (r, θ) of the image point position, and rotational shake amount (ω x ,ω y ) is composed of the above. In this embodiment, a correction coefficient table, which is a matrix of correction coefficient information (K1, K2, K3, K4) corresponding to the image point position shown in Figure 5, is pre-stored in the lens memory 106 as information regarding tilt-image shift sensitivity. This allows the amount of rotational blur (ω x ,ω y The amount of image point displacement t at a predetermined image point position A when ) occurs can be easily obtained. The interval of image point positions in the correction coefficient table is set as appropriate. Furthermore, the correction coefficient table may be managed in a Cartesian coordinate system rather than a polar coordinate system.

[0035] The information regarding tilt-image shift sensitivity may consist of tilt-image shift sensitivity for each image height in order to reduce the amount of information stored in the lens memory 106, or it may be possible to obtain the amount of image point movement t using positional information of a predetermined image point position where vibration isolation is performed. Furthermore, the positional information of the image point position may be polar coordinate system information or predetermined coordinate system information (e.g., Cartesian coordinate system). (Setting of vibration isolation position information on the imaging surface) In this embodiment, the setting mode of the imaging system 1 can be switched between an image center vibration isolation mode, which sets a predetermined image point position (vibration isolation position) for vibration isolation to the center of the imaging plane, and a vibration isolation location setting mode, which allows the vibration isolation position to be set to a predetermined image point position. When the vibration isolation location setting mode is set, the vibration isolation position can be set on the display / operation unit 203. The position that can be set on the display / operation unit 203 may be linked to the image point position for autofocus or the image point position for automatic metering. The image point position for autofocus may be a position automatically detected by pupil detection, person detection, etc. The vibration isolation position information (r,θ) on the imaging plane is sent to the camera-side microcontroller 202, and the correction coefficient information to be used is selected from the correction coefficient table. (Motion detection signal) The gyro sensor 205 detects the angular velocity around multiple rotation axes of the imaging system 1 and outputs information regarding the amount of rotational shake as a motion detection signal. In this embodiment, the gyro sensor 205 detects the angular velocity around the X axis and the Y axis and outputs information regarding the amount of rotational shake (ω x ,ω y The acceleration sensor 206 detects the acceleration in multiple axial directions of the imaging system 1 and outputs information regarding the amount of translational shake as a motion detection signal. In this embodiment, the acceleration sensor 206 detects the acceleration in the X-axis direction and the Y-axis direction and outputs information regarding the amount of translational shake (a x ,a y It outputs information related to ). The gyro sensor 205 may consist of multiple sensors, each detecting angular velocity around one axis. Similarly, the accelerometer 206 may consist of multiple sensors, each detecting acceleration in one direction. (Derivation of image blur correction drive amount) The camera-side microcontroller 202 acquires the image blur correction drive amount using information on tilt-image shift sensitivity, vibration isolation position information, and motion detection signals. For example, when correcting image blur at a predetermined image point position A due to rotational blur using IIS, the image sensor 201 should be moved in such a way that it cancels out the image point movement amount t. The image blur correction drive amount x in the X-axis direction and the image blur correction drive amount y in the Y-axis direction of the IIS actuator 210 are expressed by the following equations (15) and (16).

[0036] x=t r ·cosθ-t θ ·sinθ =ω y {sin 2 θ+k LS_r (r)·cos 2 θ}LS +ω x {k LS_r (r)-1}LS·sinθ·cosθ =K′1(r,θ)·ω y +K′2(r,θ)·ω x (15) y=t r ·sinθ+t θ ·cosθ =ω y {k LS_r (r)-1}LS·sinθ·cosθ +ω x {k LS_r (r)·sin 2 θ+cos 2 θ}LS =K′3(r,θ)·ω y +K′4(r,θ)·ω x (16) Thus, in (15) and in (16) add (K′1,K′2). ,K′3,K′4) is one of the graphs. K′1(r,θ)={sin2θ+k LS_r (r)·cos2θ}LS K′2(r,θ)={k LS_r (r)-1}LS·sinθ·cosθ K′3(r,θ)={k LS_r (r)-1}LS·sinθ·cosθ K′4(r,θ)={k LS_r (r)·sin2θ+cos2θ}LS Figure 6 shows the ratio and direction of the remaining image point movement amount at each image point when the image blur at a predetermined image point position A in this embodiment is corrected by IIS. As shown in Figure 6, the image blur at the set predetermined image point position A is well corrected while allowing image blur in the center of the image. Furthermore, since image point movement with the same motion vector as image point position A occurs at image point position A' which is symmetric to image point position A with the image center as the origin, the image blur at image point position A' is also corrected. For this reason, by appropriately setting the vibration isolation position at a predetermined position outside the optical axis within a range where the unnaturalness of image blur in the center of the image does not become large, it is possible to reduce the overall image blur while minimizing the difference in the amount of image blur across the entire image.

[0037] As shown in equations (15) and (16), the image blur correction drive amount (x,y) is the correction coefficient information (K'1, K'2, K'3, K'4) and the rotational blur amount (ω x ,ω y It consists of ) and . Therefore, a correction coefficient table, which summarizes the correction coefficient information (K'1, K'2, K'3, K'4) in matrix form, may be stored in the lens memory 106 as information regarding tilt-image shift sensitivity. By using K'1 etc. instead of the aforementioned correction coefficient information (K1, K2, K3, K4), the rotational blur amount (ω x ,ω y This makes it easy to obtain the correction drive amount (x,y) for a predetermined image point position A when ) occurs.

[0038] Furthermore, when performing OIS, the OIS eccentricity sensitivity TS(h) of the OIS optical system 1014 increases with increasing image height. Therefore, it is preferable to acquire the image blur correction drive amount while considering the OIS eccentricity sensitivity TS(h). This enables high-precision image blur correction.

[0039] Regarding image blur due to translational blur, the image blur correction drive amount can be obtained using information on the amount of translational blur from the accelerometer 206. The image blur correction drive amount for translational blur is obtained by using the distance information of the object in focus to obtain the amount of translational blur (a x ,a y ) rotational wobble amount (ω x,ω y It may also be obtained by converting to ). Furthermore, when rotational and translational shake occurs simultaneously, the image shake correction drive amount may be obtained by adding the image shake correction drive amount for translational shake and the image shake correction drive amount for rotational shake. In addition, the image shake correction drive amount for translational shake at a predetermined image point position may be obtained by multiplying the converted rotational shake amount by a correction coefficient included in the information on tilt-image shift sensitivity.

[0040] Furthermore, when the focus position is very close, the translational component of the object surface caused by rotational blur becomes large. Therefore, the amount of image blur correction drive for image blur caused by the translational component according to the object distance may be obtained using the method described above.

[0041] Furthermore, the tilt-image shift sensitivity changes depending on the object distance and focal length (image angle of view) of the object in focus of the imaging optical system 101. In this embodiment, the lens memory 106 stores multiple different correction coefficient tables depending on the focus position determined by the focus optical system 1011 and the focal length determined by the magnification optical system 1012. This makes it possible to effectively correct image blur at a predetermined image point position even during magnification and focusing.

[0042] Furthermore, the lens device 100 may be configured to be detachable from the imaging device 200. In this case, it is preferable to use appropriate tilt-image shift sensitivity information for each lens device 100. This makes it possible to effectively correct image blur at a predetermined image point position even when different lens devices 100 are attached to the imaging device 200. [Second Embodiment] In this embodiment, the information regarding tilt-image shift sensitivity is expanded compared to the first embodiment. Since the configuration of the imaging system 1 and the processing during image blur correction in this embodiment are the same as in the first embodiment, a detailed explanation is omitted.

[0043] In this embodiment, the amount of distortion aberration that causes the subject image of the imaging optical system 101 to deform into a barrel shape is greater than in the first embodiment. In an imaging optical system with small distortion aberration, the amount of image point movement in a direction perpendicular to the image point movement direction at the center of the image when the imaging optical system is tilted is about the same as the amount of image point movement at the center of the image at any image point position. On the other hand, in the imaging optical system 101 of this embodiment, because the amount of distortion aberration is large, the amount of image point movement in a direction perpendicular to the image point movement direction at the center of the image when the imaging optical system 101 is tilted becomes smaller the further away from the center of the image. Therefore, in this embodiment, the lens memory 106 stores information on tilt-image shift sensitivity that is significant with respect to the amount of image point movement in a direction perpendicular to the image point movement direction at the center of the image caused by rotational blur.

[0044] Figure 7 shows the relationship between the image height in the direction perpendicular to the image point movement direction at the center of the image and the tilt-image shift sensitivity (amount of image point movement) when the imaging optical system 101 of this embodiment is tilted. Figure 8 shows the ratio and direction of the remaining image point movement amount at each image point when the image blur at the center of the image of this embodiment is corrected by IIS. The image height in the direction perpendicular to the image point movement direction at the center position O of the imaging plane on the horizontal axis of Figure 7 is the image height in the direction perpendicular to the R direction in the polar coordinate system. As shown in Figure 7, the image height h in the direction perpendicular to the image point movement direction at the center of the image when the imaging optical system 101 of this embodiment, which has a large amount of distortion aberration, is tilted. θ Tilt-image shift sensitivity LS θ (h θ ) is smaller than the tilt-image shift sensitivity LS at the center of the image. Therefore, if image blur correction is performed at image point positions with high image height using the image blur correction drive amount obtained using the tilt-image shift sensitivity LS at the center of the image, overcorrection occurs as shown in Figure 8.

[0045] Therefore, in this embodiment, the tilt-image shift sensitivity is defined as information that takes into account the amount of image point movement for each image height in a direction parallel to the rotation axis when the imaging optical system 101 is tilted, in addition to the information described in the first embodiment. Image height h with respect to tilt-image shift sensitivity LS at the center of the image θ The slope-image shift sensitivity coefficient k LS_θ (h θ) is expressed by the following equation (17).

[0046] k LS_θ (h θ )=LS θ (h θ ) / LS (17) Rotational wobble (ω x ,ω y The parallel component t parallel to the line OA is the polar coordinate system component of the image point displacement t at a predetermined image point position A when ) occurs. r and the perpendicular component t perpendicular to the line OA θ These are represented by the following equations (12a) and (13a), respectively.

[0047] t r =t rx +t ry =k LS_r (r)·k LS_θ (0)·LS(ω y ·cosθ+ω x ·sinθ) =K1(r,θ)·ω y +K2(r,θ)·ω x (12a) t θ =t θx +t θy =k LS_r (0)·k LS_θ (r)·LS(-ω y sinθ+ω x cosθ) =K3(r,θ)·ω y +K4(r,θ)·ω x (13a) Here, the coefficients (K1, K2, K3, K4) in equations (12a) and (13a) are obtained by rearranging the coefficients as follows. K1(r,θ)=k LS_r (r)·LS·cosθ K2(r,θ)=k LS_r (r)·LS·sinθ K3(r,θ)=-k LS_θ (r)·LS·sinθ K4(r,θ)=k LS_θ (r)·LS·cosθ Furthermore, the image blur correction drive amount x in the X-axis direction and the image blur correction drive amount y in the Y-axis direction of the IIS actuator 210 are expressed by the following equations (15a) and (16a).

[0048] x=t r ·cosθ-t θ ·sinθ =ω y {k LS_θ (r)·sin 2 θ+k LS_r (r)·cos 2 θ}LS +ω x {k LS_r (r)-k LS_θ (r) LS·sinθ·cosθ =K′1(r,θ)·ω y +K′2(r,θ)·ω x (15a) y=t r ·sinθ+t θ ·cosθ =ω y {k LS_r (r)-k LS_θ (r) LS·sin·θcosθ +ω x {k LS_r (r)·sin 2 θ+k LS_θ (r)·cos 2 θ}LS =K′3(r,θ)·ω y +K′4(r,θ)·ω x (16a) Here, the coefficients (K'1, K'2, K'3, K'4) in equations (15a) and (16a) are obtained by rearranging the coefficients as follows. K′1(r,θ)={k LS_θ (r)·sin2θ+k LS_r (r)·cos2θ}LS K′2(r,θ)={k LS_r (r)-kLS_θ(r)}LS·sinθ·cosθ K′3(r,θ)={k LS_r (r)-kLS_θ(r)}LS·sinθ·cosθ K′4(r,θ)={k LS_r (r)·sin2θ+k LS_θ (r)·cos2θ}LS As described above, in this embodiment, the image blur correction drive amount is obtained by considering the tilt-image shift sensitivity for each image height in directions parallel and perpendicular to the rotation axis. This makes it possible to effectively correct image blur at a predetermined image point position even in the imaging system 1 using the imaging optical system 101 which has a large amount of distortion aberration.

[0049] Furthermore, optical systems designed with fisheye lens projection methods (e.g., equidistant projection or equisolid angle projection) also have significant tilt-image shift sensitivity characteristics with respect to the amount of image point movement in the θ direction. Therefore, it is preferable to obtain the image blur correction drive amount by considering the tilt-image shift sensitivity for each image height in the R and θ directions.

[0050] Furthermore, when guaranteeing a large vibration isolation angle as a specification of the vibration isolation mechanism, it is preferable to determine the image blur correction drive amount considering the tilt-image shift sensitivity of this embodiment. [Examples]

[0051] Hereinafter, embodiments of the imaging optical system 101 of the present invention will be described based on the attached drawings.

[0052] Figures 9, 11, and 13 are cross-sectional views of the optical system L0 of Examples 1 to 3 when the object distance is in focus at infinity at the wide-angle end. The arrows shown in each cross-sectional view represent the movement trajectory of each lens group when zooming from the wide-angle end to the telephoto end. Figure 15 is a cross-sectional view of the optical system L0 of Example 4 when the object distance is in focus at infinity. The arrows shown in Figure 15 represent the movement trajectory of the lens group when focusing from infinity to near distance. The optical system L0 of each example can be used in imaging devices such as digital video cameras, digital still cameras, broadcast cameras, surveillance cameras, and smartphone cameras.

[0053] In each cross-sectional view, the left side is the object side and the right side is the image side. The optical system L0 of each embodiment is composed of multiple lens groups. In this specification, a lens group is a collection of lenses that move or remain stationary as a whole during zooming, focusing, or image stabilization. That is, in the optical system L0 of each embodiment, the distance between adjacent lens groups changes during zooming or focusing. A lens group may consist of a single lens or multiple lenses. Furthermore, a lens group may include an aperture diaphragm.

[0054] SP is the aperture diaphragm. IP is the image plane, where the imaging surface of an image sensor (photoelectric conversion element) such as a CCD sensor or CMOS sensor is located. Also, the optical system for OIS is eccentric with respect to the optical axis of the optical system L0 when OIS is performed.

[0055] The projection method for the optical system L0 in Examples 1, 2, and 4 is central projection (Y=ftanθ). The projection method for the optical system L0 in Example 3 is equisolid angle projection (Y=2·f·sin(θ / 2)).

[0056] Figures 10, 12, and 14 are aberration diagrams for the optical systems L0 of Examples 1 to 3 when the object distance is in focus at infinity at the wide-angle end. Figure 16 is an aberration diagram for the optical system L0 of Example 4 when the object distance is in focus at infinity.

[0057] In the spherical aberration diagram, Fno is the F-number and indicates the amount of spherical aberration for the d-line (wavelength 587.6 nm) and the g-line (wavelength 435.8 nm). In the astigmatism diagram, S indicates the amount of astigmatism at the sagittal image plane, and M indicates the amount of astigmatism at the meridional image plane. In the distortion diagram, the amount of distortion for the d-line is shown. In the chromatic aberration diagram, the amount of lateral chromatic aberration at the g-line is shown. ω is the half-angle of view (°).

[0058] The numerical values ​​corresponding to Examples 1 to 4 are shown below.

[0059] In the surface data for each numerical example, r represents the radius of curvature of each optical surface, and d (mm) represents the on-axial spacing (distance along the optical axis) between the m-th surface and the (m+1)-th surface. Here, m is the surface number counted from the light incident surface. Also, nd represents the refractive index of each optical element with respect to the d line, and νd represents the Abbe number of the optical element. Note that the Abbe number νd of a certain material is given by Nd, NF, and NC, respectively, when the refractive indices of the Fraunhofer lines at the d line (wavelength 587.6 nm), F line (wavelength 486.1 nm), and C line (wavelength 656.3 nm). νd = (Nd-1) / (NF-NC) It is represented as follows.

[0060] In each numerical example, d, focal length (mm), F-number, and half-angle of view (°) are all values ​​when the optical system L0 of each example is focused on an object at infinity. Back focus (BF) is the distance along the optical axis from the final lens surface (the lens surface closest to the image) to the paraxial image plane, expressed in terms of air equivalent length. The total optical length is the distance along the optical axis from the front lens surface (the lens surface closest to the object) to the final lens surface, plus the back focus.

[0061] Furthermore, if the optical surface is aspherical, the sign * is added to the right of the surface number. The aspherical shape is defined as follows, where X is the displacement from the surface vertex in the optical axis direction, h is the height from the optical axis perpendicular to the optical axis, R is the paraaxial radius of curvature, k is the cone constant, and A4, A6, A8, A10, A12 are the aspherical coefficients of their respective orders. X=( h 2 / R) / [1+{1-(1+k)(h / R) 2} 1 / 2 ]+A4× h4 +A6×h 6 +A8×h 8 +A10×h 10 +A12×h 12 This is expressed as follows. Note that "e±XX" in each aspherical coefficient is "×10 ±XX It means "...".

[0062] Furthermore, each numerical example shows tilt-image shift sensitivity data and eccentricity sensitivity data for eccentricity of the OIS optical system. The derivation methods for these are explained using Figure 17.

[0063] Figure 17 shows the ray traces of the principal rays of the d line (principal ray at half-angle 0 and principal ray at half-angle ω) corresponding to each field of view incident from the object surface in the optical system L0 of Example 1. Figures 17(A) to 16(C) show the stationary state and the tilt angle ω around the X axis centered on the intersection of the image plane IP and the optical axis, respectively. x The diagram shows the optical system L0 in a state where it is tilted by a certain amount, and in a state where the optical system for OIS is eccentric by an eccentricity amount y in the Y-axis direction.

[0064] The tilt-image shift sensitivity for each image height in the tilt direction (R direction) is the difference in image point displacement Δy, which is the difference in the imaging position on the image plane IP corresponding to each half-angle of view in Figure 17(A) and Figure 17(B). LSr (h r ) with an inclination angle ω x It is obtained by dividing by . Also, the tilt-image shift sensitivity for each image height in the direction perpendicular to the tilt direction is obtained by the image height h in the X-axis direction. θ Image point displacement Δy LSθ It is obtained using [this method]. The tilt-image shift sensitivity in each embodiment is obtained from the amount of image point movement when the optical system L0 is tilted by 0.5°. Here, the tilt angle ω x The signs of the vectors are such that counterclockwise rotation is positive and clockwise rotation is negative in Figure 17(B). Also, the signs of the image point displacement Δy are such that upward rotation is positive and downward rotation is negative.

[0065] The eccentricity sensitivity of the OIS optical system to eccentricity for each image height in the eccentric direction (R direction) is the difference in image point displacement Δy, which is the difference in the image formation position on the image plane IP corresponding to each half-angle of view in Figure 17(A) and Figure 17(C). TSr (h r This is obtained by dividing ) by the eccentricity y of the OIS optical system. In each embodiment, the eccentricity sensitivity of the OIS optical system to eccentricity for each image height in the direction perpendicular to the eccentricity direction is obtained by the image height h in the X-axis direction. θ Image point displacement Δy TSθThe data is obtained using [this method]. Note that the eccentricity sensitivity data for the OIS optical system in each embodiment is obtained from the amount of image point shift when the OIS optical system is eccentricated by 0.1 mm. [Numerical Example 1] Unit: mm Surface data Face number rd nd νd 1 211.125 2.10 1.80810 22.8 2 80.660 6.03 1.77250 49.6 3 248.854 0.15 4 57.558 6.97 1.77250 49.6 5 160.440 (variable) 6 66.217 1.40 1.88300 40.8 7 18.113 8.41 8 -206.710 1.20 1.61800 63.4 9 22.688 4.36 1.85478 24.8 10 79.196 4.20 11 -35.317 1.20 1.58313 59.4 12* -312.513 0.43 13 910.041 5.47 1.59270 35.3 14 -19.928 1.10 1.88300 40.8 15 -47.138 (variable) 16 (aperture) ∞ 0.40 17 81.194 4.45 1.83481 42.7 18 -54.244 0.15 19 41.217 7.25 1.49700 81.5 20 -32.257 1.10 2.00069 25.5 21 -293.896 2.41 22* -71.464 1.75 1.76802 49.2 23 64.990 1.91 1.80810 22.8 24 199.742 (Variable) 25 30.855 6.56 1.59522 67.7 26 -85.643 0.35 27 38.493 1.20 1.73800 32.3 28 22.868 7.83 1.53775 74.7 29 -71.877 0.15 30* -4310.465 1.70 1.85400 40.4 31* 109.508 (variable) 32 53.194 0.90 1.80400 46.6 33 22.891 (Variable) 34* -42.821 1.70 1.58313 59.4 35* -2156.781 0.15 36 344.261 3.20 2.00100 29.1 37 -88.670 (variable) Image plane ∞ Aspherical data Side 12 K = 0.00000e+000 A 4=-5.69442e-006 A 6=-2.29053e-009 A 8=-4.72363e-011 A10=4.65343e-013 A12=-1.99227e-015 Page 22 K = 0.00000e+000 A 4= 1.87606e-006 A 6= 1.45872e-009 A 8= 2.78338e-011 A10=-2.10980e-013 A12= 3.98590e-016 Page 30 K = 0.00000e+000 A 4=-2.01869e-005 A 6= 6.17344e-008 A 8=-2.64177e-010 A10=-2.98832e-013 A12= 2.64092e-015 Page 31 K = 0.00000e+000 A 4= 1.63774e-006 A 6= 9.32838e-008 A 8=-2.34772e-010 A10=-7.39973e-013 A12= 4.51086e-015 Page 34 K = 0.00000e+000 A 4=-2.51719e-005 A 6= 1.25180e-007 A 8=-5.32709e-010 A10= 5.08044e-013 A12= 7.30860e-016 Page 35 K = 0.00000e+000 A 4=-2.60571e-005 A 6= 1.26402e-007 A 8=-6.23562e-010 A10= 1.45147e-012 A12=-1.39940e-015 Various data Zoom ratio 2.74 Wide-angle, Medium, Telephoto Focal length 24.72 43.76 67.66 F number 2.91 2.91 2.91 Half-angle 42.00 25.95 17.34 Image height 21.64 21.64 21.64 Optical total length 144.33 158.18 172.04 BF 14.30 25.72 35.98 d 5 0.80 17.81 28.91 d15 16.54 8.10 2.46 d24 11.55 5.41 3.56 d31 2.38 1.11 0.91 d33 12.58 13.85 14.04 d37 14.30 25.72 35.98 Tilt-image shift sensitivity data for each image height in the tilt direction at the wide-angle end. JPEG0007830136000001.jpg85117

[0066] Tilt-image shift sensitivity data for each image height in the direction perpendicular to the tilt direction at the wide-angle end. JPEG0007830136000002.jpg73114

[0067] Eccentricity sensitivity data for each image height in the eccentricity direction for the OIS optical system at the wide-angle end. JPEG0007830136000003.jpg65112

[0068] Eccentricity sensitivity data for each image height in the direction perpendicular to the eccentricity direction with respect to the eccentricity of the OIS optical system at the wide-angle end. JPEG0007830136000004.jpg72111

[0069] [Numerical Example 2] Unit: mm Surface data Face number rd nd νd 1* 3000.000 2.85 1.58313 59.4 2* 16.526 10.57 3* -809.327 2.25 1.85400 40.4 4* 91.828 5.56 5 -53.256 1.20 1.59522 67.7 6 68.528 0.15 7 43.587 5.03 1.85478 24.8 8 -485.244 (variable) 9 63.607 2.67 1.84666 23.9 10 -1472.964 0.15 11 52.737 1.00 1.92286 20.9 12 22.996 5.41 1.53172 48.8 13 489.976 (variable) 14 (aperture) ∞ (variable) 15 27.733 1.20 2.00069 25.5 16 19.641 9.29 1.53775 74.7 17 -78.882 (variable) 18 -67.558 4.31 1.92286 20.9 19 -20.948 0.77 1.83400 37.2 20 136.126 3.52 21 ∞ (Variable) 22 30.487 11.20 1.49700 81.6 23 -50.182 0.15 24 40.928 11.00 1.49700 81.6 25 -25.800 1.20 2.05090 26.9 26 208.835 4.54 27* -73.669 2.10 1.85400 40.4 28* -1000.000 0.15 29 216.036 3.40 1.92286 20.9 30 -127.538 (variable) Image plane ∞ Aspherical data Front page K = 0.00000e+000 A 4= 8.30213e-006 A 6=-1.33976e-008 A 8= 4.25008e-011 A10=-8.60253e-014 A12= 1.03363e-016 2nd side K =-9.81344e-001 A 4= 4.49709e-007 A 6=-2.34544e-008 A 8=-1.05516e-010 A10=8.07443e-013 A12=-2.78552e-015 3rd page K = 0.00000e+000 A 4=-9.01759e-006 A 6=-1.39642e-007 A 8= 1.23272e-009 A10=-3.49283e-012 A12= 3.62808e-015 Side 4 K = 0.00000e+000 A 4= 6.34981e-006 A 6=-1.29871e-007 A 8= 1.67920e-009 A10=-6.48374e-012 A12= 1.50043e-014 Page 27 K = 0.00000e+000 A 4=-8.04129e-005 A 6= 2.64851e-007 A 8=-1.06038e-009 A10=4.87911e-012 A12=-8.56493e-015 Page 28 K = 0.00000e+000 A 4=-6.00659e-005 A 6= 2.67376e-007 A 8=-7.05021e-010 A10=2.04492e-012 A12=-2.97985e-015 Various data Zoom ratio 2.20 Wide-angle, Medium, Telephoto Focal length 15.45 24.00 33.95 F number 2.91 2.91 2.91 Half-angle 55.41 41.57 31.88 Image height 21.64 21.64 21.64 Optical total length 159.58 147.48 144.99 BF 14.00 22.21 32.15 d 8 25.32 7.72 1.50 d13 8.24 11.30 7.40 d14 13.71 5.42 0.71 d17 1.60 9.89 14.61 d21 7.04 1.27 -1.05 d30 14.00 22.21 32.15 Tilt-image shift sensitivity data for each image height in the tilt direction at the wide-angle end. JPEG0007830136000005.jpg90122

[0070] Tilt-image shift sensitivity data for each image height in the direction perpendicular to the tilt direction at the wide-angle end. JPEG0007830136000006.jpg87123

[0071] Eccentricity sensitivity data for each image height in the eccentricity direction for the OIS optical system at the wide-angle end. JPEG0007830136000007.jpg82122

[0072] Eccentricity sensitivity data for each image height in the direction perpendicular to the eccentricity direction with respect to the eccentricity of the OIS optical system at the wide-angle end. JPEG0007830136000008.jpg83122

[0073] [Numerical Example 3] Unit: mm Surface data Face number rd nd νd 1 69.371 2.50 1.76385 48.5 2 14.745 14.38 3 263.184 1.35 1.53775 74.7 4 20.476 5.83 5 -39.045 1.20 1.59282 68.6 6 33.526 0.24 7 26.797 6.12 1.85025 30.1 8 -37.028 (variable) 9 -25.901 1.30 1.91082 35.3 10 -122.028 (variable) 11 ∞ 1.00 12 24.286 2.50 1.48749 70.2 13 -95.780 0.20 14 20.038 1.00 1.95375 32.3 15 11.039 3.62 1.51742 52.4 16 231.303 2.50 17 (aperture) ∞ 6.09 18 1764.677 0.90 1.67300 38.3 19 15.325 3.96 1.76385 48.5 20 -112.119 (variable) 21 53.370 3.77 1.43700 95.1 22 -76.916 0.30 23 -276.683 6.34 1.43700 95.1 24 -16.095 1.20 1.88300 40.8 25 -21.730 0.94 26 -17.489 1.40 1.88300 40.8 27 -24.438 (variable) Image plane ∞ Various data Zoom ratio 1.86 Wide-angle, Medium, Telephoto Focal length 8.10 11.97 15.06 F-number 4.10 4.10 4.10 Half-angle 91.53 90.00 90.34 Image height 11.50 17.00 21.50 Optical total length 111.33 107.33 108.91 BF 13.12 24.44 31.62 d 8 3.88 3.84 3.41 d10 17.92 6.25 1.70 d20 7.77 4.16 3.54 d27 13.12 24.44 31.62 Tilt-image shift sensitivity data for each image height in the tilt direction at the wide-angle end. JPEG0007830136000009.jpg87115

[0074] Tilt-image shift sensitivity data for each image height in the direction perpendicular to the tilt direction at the wide-angle end. JPEG0007830136000010.jpg81115

[0075] [Numerical Example 4] Unit: mm Surface data Face number rd nd νd 1 50.658 1.57 1.48749 70.2 2 17.433 7.73 3 82.620 1.50 1.48749 70.2 4 22.068 13.94 5 28.055 5.75 1.90043 37.4 6 -26.190 1.00 1.80000 29.8 7 -678.364 6.06 8 (aperture) ∞ 2.86 9 74.460 1.40 1.77250 49.6 10 -3498.619 2.98 11 -20.479 1.00 1.85478 24.8 12 30.759 3.15 1.49700 81.5 13 -76.152 0.29 14 107.343 4.13 1.58313 59.4 15* -42.035 0.15 16 108.394 4.96 1.85150 40.8 17 -35.438 (variable) 18 -72.427 1.84 1.83481 42.7 19 -45.108 10.50 20 -23.819 1.57 1.51742 52.4 21 -53.298 11.00 Image plane ∞ Aspherical data Page 15 K = 0.00000e+000 A 4= 2.14904e-005 A 6=-6.26885e-009 A 8= 3.11936e-010 A10=-1.96590e-012 A12= 3.25155e-015 Various data Focal length 20.60 F-number 1.85 Half-angle 46.42 Image height 18.71 Optical total length 84.88 BF 11.00 Infinity Close d17 1.50 11.92 Tilt-image shift sensitivity data for each image height in the tilt direction when focused at infinity. JPEG0007830136000011.jpg79111

[0076] Tilt-image shift sensitivity data for each image height in the direction perpendicular to the tilt direction when in focus at infinity. JPEG0007830136000012.jpg74110

[0077] Eccentricity sensitivity data for each image height in the eccentricity direction of the OIS optical system when focused at infinity. JPEG0007830136000013.jpg83110

[0078] Eccentricity sensitivity data for each image height in the direction perpendicular to the eccentricity direction of the OIS optical system when focused at infinity. JPEG0007830136000014.jpg90109

[0079] As described above, according to the configuration of the present invention, image blur at a predetermined image point position including the optical axis center can be easily and favorably corrected.

[0080] In each embodiment, the information regarding the image shift sensitivity with respect to the tilt of the imaging optical system 101 according to the image point position is a correction coefficient table that summarizes the correction coefficient information according to the image point position in a matrix format, but the present invention is not limited thereto. Tilt - image shift sensitivity LS r (h r ), LS θ (h θ ) may be used, or it may be correction coefficient information outside the optical axis obtained from the tilt - image shift sensitivity. That is, the information regarding the image shift sensitivity may be information that can acquire the movement amount of a predetermined image point position with respect to the tilt of the imaging optical system 101.

[0081] Also, in each embodiment, the tilt - image shift sensitivity has been described as information for each image height in the direction (R direction) orthogonal to the rotation axis of the tilt of the imaging optical system 101 and in the direction parallel to the rotation axis of the tilt. However, the tilt - image shift sensitivity may be information defined for each image point position over the entire imaging surface with respect to a predetermined tilt direction. In that case, it may be the tilt - image shift sensitivity directly obtained from the image point movement amount over the entire imaging surface acquired using the design values of the imaging optical system 101.

[0082] Also, in each numerical example, the image point position is acquired using the imaging position of the chief ray, but it may be acquired using the peak position of the MTF (Modulation Transfer Function).

[0083] Further, the camera - side microcomputer 202 may perform image blur correction using an electronic shake - correction function that changes the effective pixel area of the imaging device 201. That is, the camera - side microcomputer 202 may function as one of the shake - correction means. [Other Embodiments] The present invention can also be realized by supplying a program that implements one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and causing one or more processors in a computer of the system or apparatus to read and execute the program. It can also be realized by a circuit (for example, an ASIC) that implements one or more functions.

[0084] As described above, the preferred embodiments and examples of the present invention have been explained. However, the present invention is not limited to these embodiments and examples, and various combinations, modifications, and changes are possible within the scope of the gist thereof.

Explanation of Reference Numerals

[0085] 101 Imaging optical system 102 Lens-side microcomputer (control device) 105 Actuator for OIS (shake correction means) 202 Camera-side microcomputer (control device) 210 Actuator for IIS (shake correction means)

Claims

1. A first acquisition means that acquires information on image shift sensitivity and information on blur from a storage means that holds information on image shift sensitivity to the tilt of the imaging optical system according to the image point position of the imaging optical system based on the design value of the imaging optical system, It includes a second acquisition means for acquiring the correction drive amount during image blur correction of the blur correction means that corrects image blur, The information regarding the image shift sensitivity includes the distortion aberration of the imaging optical system. The control device is characterized in that the second acquisition means acquires the correction drive amount corresponding to the predetermined image point position using information regarding the image shift sensitivity corresponding to a predetermined image point position and information regarding blur.

2. The control device according to claim 1, characterized in that the information regarding the image shift sensitivity is obtained using the design value of the imaging optical system.

3. The control device according to claim 1 or 2, characterized in that the information relating to the image shift sensitivity is information that can acquire the amount of movement of the predetermined image point position with respect to the tilt of the imaging optical system.

4. The control device according to any one of claims 1 to 3, characterized in that the information relating to the image shift sensitivity is information determined for each position on the image plane.

5. The control device according to any one of claims 1 to 4, characterized in that the information regarding the shake is obtained based on the output of a gyro sensor.

6. The control device according to any one of claims 1 to 4, characterized in that the correction drive amount is obtained using information regarding the blur, information regarding the predetermined image point position, and information regarding the image shift sensitivity.

7. The control device according to any one of claims 1 to 6, characterized in that the information relating to the wobble includes information relating to the angular velocity around a plurality of rotation axes.

8. The control device according to any one of claims 1 to 7, characterized in that the information relating to the vibration includes information relating to acceleration in multiple axial directions.

9. The control device according to any one of claims 1 to 8, characterized in that the predetermined image point position is a position on the image plane represented by a plurality of parameters.

10. The control device according to any one of claims 1 to 9, characterized in that the information relating to the image shift sensitivity differs depending on the focal length of the imaging optical system.

11. The control device according to any one of claims 1 to 10, characterized in that the information relating to the image shift sensitivity differs depending on the distance of the object to be focused.

12. The control device according to any one of claims 1 to 11, characterized in that the blur correction means eccentricates the image sensor with respect to the optical axis of the imaging optical system.

13. The control device according to any one of claims 1 to 12, characterized in that the blur correction means changes the effective pixel area in the image sensor.

14. The control device according to any one of claims 1 to 13, characterized in that the blur correction means eccentricates at least a part of the imaging optical system with respect to the optical axis of the imaging optical system.

15. Image sensor and An imaging apparatus characterized by having a control device according to any one of claims 1 to 14.

16. The imaging apparatus according to claim 15, further comprising a storage means for storing information relating to the image shift sensitivity of the imaging optical system to the tilt of the imaging optical system, taking into account the distortion aberration of the imaging optical system.

17. The imaging apparatus according to claim 15 or 16, further comprising the imaging optical system.

18. Imaging optical system, A lens device characterized by having a control device according to any one of claims 1 to 14.

19. The lens device according to claim 18, further comprising a storage means for storing information relating to the image shift sensitivity of the imaging optical system to the tilt of the imaging optical system, taking into account the distortion aberration of the imaging optical system.

20. A control method for obtaining the correction drive amount during image blur correction by a blur correction means for correcting image blur, A first acquisition step involves obtaining information on image shift sensitivity from a storage means that holds information on image shift sensitivity to the tilt of the imaging optical system according to the image point position of the imaging optical system based on the design value of the imaging optical system, and also obtaining information on blur. The second acquisition step involves obtaining a correction drive amount for the blur correction means corresponding to the predetermined image point position, using information regarding the image shift sensitivity corresponding to a predetermined image point position and information regarding the blur. A control method characterized in that the information regarding the image shift sensitivity is information that takes into account the distortion aberration of the imaging optical system.

21. A program that causes a computer to execute the control method described in claim 20.

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