JP2009075221A - Camera-shake correction device, and camera body and replacement lens provided therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera-shake correction control device, capable of appropriately selecting, camera-shake correcting functions provided in a camera body and in a replacement lens according to the property of camera shake. <P>SOLUTION: The camera-shake correction control device 60 for controlling camera-shake correction by a camera system 1 including a camera body 2 and a replacement lens 4 each provided with camera-shake correcting function has a body performance input means 60c for inputting a body correcting performance parameter; a lens performance input means 60a for inputting a lens correcting performance parameter; a holding state input means 60e for inputting a holding state parameter showing a holding state of the camera system; and a camera-shake correcting function selection means 60d for selecting the camera-shake correcting function of the camera body or the camera-shake correcting function of the replacement lens based on the input body correcting performance parameter, lens correcting performance parameter and holding state parameter. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a camera shake correction control device, and a camera body and an interchangeable lens including the same, and more particularly, a camera shake correction control device that controls camera shake correction by a camera system including a camera body and an interchangeable lens having a camera shake correction function, and The present invention relates to a camera body and an interchangeable lens.

  Japanese Patent Laying-Open No. 2005-189654 (Patent Document 1) describes a camera provided with a camera shake correction mechanism. In this camera, a camera shake correction mechanism is incorporated on the camera body side and the interchangeable lens side, and when the focal length of the interchangeable lens exceeds a predetermined value, the camera body side camera shake correction mechanism is selected and the predetermined value If it does not exceed, the camera shake correction mechanism on the interchangeable lens side is selected.

JP 2005-189654 A

  However, the performance of the image stabilization mechanism includes various elements, and it is difficult to sufficiently evaluate the image stabilization function provided in the camera body and the interchangeable lens only by referring to the focal length of the interchangeable lens. Therefore, there is a problem that the individual camera shake correction mechanisms cannot be fully utilized. In addition, there are various types of camera shake, and the camera shake that still remains when the photographer carefully holds the camera and the camera shake that occurs when the photographer follows a moving subject are to correct them. The characteristics of the camera shake correction mechanism required for the camera are also different.

  Therefore, the present invention provides a camera shake correction control device capable of appropriately selecting a camera shake correction function provided in the camera body and the interchangeable lens according to the nature of the camera shake occurring, and a camera body provided with the camera body replacement It aims to provide a lens.

  In order to solve the above-described problem, the present invention is a camera shake correction control apparatus that controls camera shake correction by a camera system including a camera body having a camera shake correction function and an interchangeable lens having a camera shake correction function. Body performance input means for inputting body correction performance parameters representing camera shake correction performance, lens performance input means for inputting lens correction performance parameters representing camera shake correction performance of the interchangeable lens, and holding state parameters representing the holding state of the camera system And a camera shake correction function for selecting the camera shake correction function of the camera body or the camera shake correction function of the interchangeable lens based on the input body correction performance parameter, lens correction performance parameter, and hold state parameter. And selecting means.

  In the present invention configured as described above, the body correction performance parameter is input to the body performance input unit, the lens correction performance parameter is input to the lens performance input unit, and the holding state parameter is input to the holding state input unit. The camera shake correction function selection unit selects a camera body shake correction function or an interchangeable lens camera shake correction function based on the input body correction performance parameter, lens correction performance parameter, and holding state parameter.

  According to the present invention configured as described above, since the camera shake correction function selection unit selects the camera shake correction function with reference to the holding state parameter, the camera body and the interchangeable lens are selected according to the nature of the camera shake occurring. Can be appropriately selected.

In the present invention, the holding state parameter preferably includes a maximum shake angular velocity in a predetermined period before imaging.
According to the present invention configured as described above, since the maximum shake angular velocity is included in the holding state parameter, it is possible to appropriately select a shake correction function according to the nature of the shake.

  In the present invention, preferably, the body correction performance parameter includes a camera body correction resolution indicating a resolution of camera shake correction control executable in the camera body, and a camera body correction control responsiveness indicating a response of camera shake correction control in the camera body. The lens correction performance parameter includes an interchangeable lens correction resolution that represents the resolution of the camera shake correction control that can be executed in the interchangeable lens, and an interchangeable lens correction control response parameter that represents the responsiveness of the camera shake correction control in the interchangeable lens. The camera shake correction function selection means selects the camera shake correction function with higher response when the maximum shake angular velocity is larger than the camera body correction control response parameter or the interchangeable lens correction control response parameter. , Maximum shake angular velocity is camera body correction control responsiveness It is smaller than parameter and the interchangeable lens correction control response parameter selects the camera shake correction function based on the camera body correction resolution and the interchangeable lens correction resolution.

  According to the present invention configured as described above, when the camera shake angular velocity is large, the camera body or the interchangeable lens camera shake correction function is selected with emphasis on responsiveness, and when the camera shake angular velocity is small, the resolution is reduced. Therefore, the camera shake correction function can be appropriately selected.

  In the present invention, preferably, the holding state parameter includes a maximum shake angle in a predetermined period before imaging, and the camera shake correction function selection unit is configured to determine a shake angle expected by the camera system shake correction in the maximum shake angle. The camera shake correction function is selected using a value multiplied by the reduction rate.

  According to the present invention configured as described above, it is possible to select the camera shake correction function based on the shake angle that is considered to remain after being corrected by the camera shake correction function.

  In the present invention, preferably, the camera shake correction function selection means receives an exposure time of an image to be photographed, and the body correction performance parameter includes a camera body correction control stability parameter representing the stability of the camera body correction control. The lens correction performance parameter includes an interchangeable lens correction control stability parameter that represents the stability of the correction control of the interchangeable lens, and the camera shake correction function selection unit determines the camera shake correction performance of the camera body, Evaluate using the value obtained by multiplying the exposure time and the camera body correction control stability parameter, and evaluate the camera shake correction performance of the interchangeable lens using the value obtained by multiplying the exposure time and the interchangeable lens correction control stability parameter. .

  According to the present invention configured as described above, since the value obtained by multiplying the stability parameter by the exposure time is used for selecting the camera shake correction function, the parameter relating to the stability of the control can be effectively used for the evaluation. Can do.

  In the present invention, preferably, the camera system further includes a converter lens mounted between the camera body and the interchangeable lens, and the body correction performance parameter or the lens correction performance parameter is transmitted via the converter lens, and the converter Conversion is performed according to the magnification of the lens.

  According to the present invention configured as described above, the present invention can be applied even when a converter lens is included in the camera system, and the influence of the converter lens can be accurately evaluated.

  In addition, the present invention is a camera body having a camera shake correction function, and includes a camera body main body, an image sensor disposed inside the camera body main body, and the camera shake correction control device of the present invention. It is a feature.

  Furthermore, the present invention is an interchangeable lens used by being attached to a camera body provided with the camera shake correction control device of the present invention, a lens barrel, an imaging lens disposed inside the lens barrel, Lens performance output means for outputting a lens correction performance parameter representing the camera shake correction performance of the interchangeable lens to the camera shake correction control apparatus, and a holding state output means for outputting a holding state parameter representing the holding state of the camera system to the camera shake correction control apparatus It is characterized by having.

  According to the camera shake correction control device of the present invention, and the camera body and interchangeable lens including the camera shake correction function, the camera shake correction function provided in the camera body and the interchangeable lens can be appropriately selected according to the nature of the camera shake occurring. Can do.

Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing an entire camera system controlled by a camera shake correction control apparatus according to an embodiment of the present invention.
As shown in FIG. 1, the camera system 1 includes a camera body 2, an interchangeable lens 4, and a converter lens 6 attached between the interchangeable lens 4 and the camera body 2.

  The camera body 2 includes an image sensor 8, an image sensor actuator 10 that drives the image sensor 8, a shutter 12, body side gyros 14 a and 14 b that detect shake of the camera body 2, a mirror 16, and a pentaprism 18. A diopter correction lens 20, a release button 22, a body control unit 24, and a body side mount connector 26.

  The shake angular velocities in the yaw direction and pitch direction of the camera body 2 are detected by the body side gyros 14 a and 14 b, respectively, and are input to the body control unit 24. The body control unit 24 drives the image sensor actuator 10 in the horizontal direction and the vertical direction based on the detected shake angular velocity, and stabilizes the image formed on the image sensor 8. Thereby, the camera shake correction function in the camera body 2 is realized.

  The interchangeable lens 4 includes a lens barrel 35, imaging lenses 36 to 45 disposed inside the lens barrel 35, and a lens actuator 46 for driving an image blur correcting lens 44 among the imaging lenses. And lens-side gyros 48 a and 48 b that detect shake of the interchangeable lens 4. The interchangeable lens 4 includes a zoom encoder 50 that detects the movement amount of the zoom lens 36 among the imaging lenses, a focus encoder 52 that detects the movement amount of the focus adjustment lens 40 among the imaging lenses, Have Furthermore, the interchangeable lens 4 includes a diaphragm mechanism 54, a lens control unit 56, and a lens side mount connector 58.

  The angular velocities in the yaw direction and pitch direction of the interchangeable lens 4 are detected by the lens-side gyros 48 a and 48 b and input to the lens control unit 56. The lens control unit 56 controls the lens actuator 46 based on the detected shake angular velocity to drive the image shake correction lens 44 in the horizontal direction and the vertical direction to stabilize the image formed on the image sensor 8. Yes. Thereby, the camera shake correction function in the interchangeable lens 4 is realized.

  The converter lens 6 includes a conversion lens 28, a converter control unit 30, a converter-body mount connector 32, and a converter-interchangeable lens mount connector 34.

  When a zoom ring (not shown) provided in the lens barrel 35 is operated, the zoom lens 36 is moved in the lens barrel 35, and the focal length of the interchangeable lens 4 changes. The moving distance of the zoom lens 36 is detected by the zoom encoder 50 and input to the lens control unit 56.

  When a focus ring (not shown) provided in the lens barrel 35 is operated, the focus adjustment lens 40 is moved in the lens barrel 35, and the focus of the image formed on the image sensor 8 is adjusted. Adjusted. The moving distance of the focus adjustment lens 40 is detected by the focus encoder 52 and input to the lens control unit 56.

  Further, the aperture mechanism 54 is driven by a signal from the camera body 2 so as to have a predetermined aperture value, and is configured to adjust the amount of light incident on the image sensor 8 during exposure.

  The light incident on the lens barrel 35 is incident on the converter lens 6 via each imaging lens and diaphragm mechanism 54. The light passing through the converter lens 6 is reflected by the mirror 16 and is recognized as a finder image by the photographer via the pentaprism 18 and the diopter correction lens 20. Further, when the release button 22 is operated, the mirror 16 jumps up and the shutter 12 is opened for a predetermined exposure time, and the light that has passed through the converter lens 6 enters the image sensor 8.

  Next, the operation of the camera shake correction control apparatus according to the embodiment of the present invention will be schematically described. In the present embodiment, the camera shake correction control device 60 is built in the body control unit 24 of the camera body 2.

  First, in the lens memory 56a built in the lens control unit 56, an interchangeable lens correction control responsiveness parameter, an interchangeable lens correction control resolution parameter, an interchangeable lens correction control stability parameter, an interchangeable lens resolution parameter, and an interchangeable lens maximum correction amount parameter. Lens correction performance parameters such as interchangeable lens moment of inertia parameters are stored in advance. Further, the position of the zoom lens 36 detected by the zoom encoder 50 and the position of the focus adjustment lens 40 detected by the focus encoder 52, which are imaging condition parameters, are input to the lens control unit 56. Furthermore, in the present embodiment, the maximum shake angular velocity and the maximum shake angle detected by the lens side gyros 48a and 48b are acquired by the lens control unit 56 as the holding state parameters. The lens correction performance parameters and the holding state parameters will be described later.

  The lens correction performance parameters stored in the lens memory 56a, the photographing condition parameters detected by the encoders, and the holding state parameters detected by the gyros are transmitted via the lens-side mount connector 58 and the converter-interchangeable lens mount connector 34. Is input to the converter control unit 30. Each input lens correction performance parameter and holding state parameter are converted by the converter control unit 30 to a predetermined magnification stored in advance in a converter memory 30 a built in the converter control unit 30.

  The converted lens correction performance parameters, imaging condition parameters, and holding state parameters are input to the body control unit 24 via the converter-body mount connector 32 and the body side mount connector 26. The exposure time, which is a shooting condition parameter set in the camera body 2, is also input to the body control unit 24.

  The lens correction performance parameter input to the body control unit 24 is input to the lens performance input means 60a in the camera shake correction control device 60. The exposure time, the position of the zoom lens 36, and the position of the focus adjustment lens 40, which are imaging condition parameters, are input to the imaging condition input unit 60b in the camera shake correction control device 60. Further, the maximum shake angular velocity and the maximum shake angle, which are the holding state parameters, are input to the holding state input unit 60e in the camera shake correction control device 60.

  On the other hand, the body memory 24a built in the body control unit 24 includes a camera body correction control responsiveness parameter, a camera body correction control resolution parameter, a camera body correction control stability parameter, an image sensor resolution parameter, and a camera body maximum correction amount parameter. Body correction performance parameters such as are stored in advance. These body correction performance parameters are input to the body performance input means 60 c in the camera shake correction control device 60.

  Further, the camera shake correction function selection unit 60d in the camera shake correction control device 60 is based on the input lens correction performance parameter, body correction performance parameter, and photographing condition parameter, and the camera shake correction function of the camera body 2 or the camera shake of the interchangeable lens 4 is detected. Select which correction function to use. The selection of the camera shake correction function based on each parameter will be described later.

Next, each parameter will be described.
The interchangeable lens correction control responsiveness parameter a _L is a parameter indicating the degree of responsiveness for moving the image blur correction lens 44 in the interchangeable lens 4. In this embodiment, the lens actuator 46 corrects the image blur. This is represented by the maximum acceleration with which the lens 44 can be moved.

The interchangeable lens correction control resolution parameter is a parameter indicating the minimum moving distance when the lens actuator 46 moves the image blur correction lens 44. In the present embodiment, the position of the image blur correction lens 44 moved by the lens actuator 46 is detected by a Hall element (not shown), and the detected voltage is detected by an A / D converter (not shown). Since conversion into digital data is performed and control is performed based on this data, the resolution of the A / D converter corresponds to the interchangeable lens correction control resolution parameter r _L.

The interchangeable lens correction control stability parameter s _L is a parameter indicating the stability of the position of the image blur correction lens 44 positioned by the lens actuator 46. In this embodiment, the deflection angular velocity of the interchangeable lens 4 is detected by the lens-side gyros 48a and 48b. However, since errors such as temperature drift generally exist in the gyroscope, even when the interchangeable lens 4 is stationary. A signal is output from the gyro. In this embodiment, the error such as the gyro drift becomes the limit of the stability of the correction control. Therefore, the speed corresponding to the temperature drift is set as the interchangeable lens correction control stability parameter s _L.

The interchangeable lens maximum correction amount parameter b _L is a parameter representing a distance at which the image blur correction lens 44 can be moved to the maximum by the lens actuator 46. This parameter is related to a mechanical movement limit, an electrically controllable range, and the like.

Interchangeable lens resolution parameter q _L is a parameter indicating the optical resolution of the interchangeable lens 4, it has units of length.
The interchangeable lens moment of inertia parameter i _L is a parameter based on the moment of inertia of the interchangeable lens 4 and is multiplied by the square of the distance from the assumed position where the camera body 2 is held to the center of gravity of the interchangeable lens 4 and the mass of the interchangeable lens. Is expressed by the reciprocal of the moment of inertia obtained by.

The camera body correction control responsiveness parameter a _B is a parameter indicating the degree of responsiveness for moving the image sensor 8 in the camera body 2. In the present embodiment, the image sensor actuator 10 moves the image sensor 8. It is represented by the maximum acceleration that can be caused.

The camera body correction control resolution parameter r _B is a parameter indicating a minimum moving distance when the image sensor actuator 10 moves the image sensor 8. In the present embodiment, the position of the image sensor 8 moved by the image sensor actuator 10 is detected by a Hall element (not shown), and the detected voltage is converted into digital data by an A / D converter (not shown). Since the control is performed based on this data, the resolution of the A / D converter corresponds to the camera body correction control resolution parameter r _B.

The camera body correction control stability parameter s _B is a parameter indicating the stability of the position of the image sensor 8 positioned by the image sensor actuator 10. In this embodiment, the shake angular velocity of the camera body 2 is detected by the body-side gyros 14a and 14b. However, since errors such as temperature drift generally exist in the gyro, even when the camera body 2 is stationary. A signal is output from the gyro. In this embodiment, the error such as the gyro drift becomes the limit of the stability of the correction control. Therefore, the speed corresponding to the temperature drift is set as the camera body correction control stability parameter s _B.

The camera body maximum correction amount parameter b _B is a parameter representing a distance at which the image sensor 8 can be moved to the maximum by the image sensor actuator 10. This parameter is related to a mechanical movement limit, an electrically controllable range, and the like.
The image sensor resolution parameter q _B is a parameter determined based on the pixel interval of the image sensor 8 and the like, and has a unit of length.

Next, the effectiveness of the lens correction performance parameter will be described with reference to FIG. FIG. 2 is an explanatory diagram of the effectiveness.
Since the influence of the lens correction performance parameter on the image on the image sensor 8 varies depending on the position of the zoom ring, the position of the focus ring, and the like, it is necessary to convert this degree as the effectiveness k. That is, as shown in FIG. 2, when the image blur correction lens 44 is moved by ΔLs, the image on the image sensor 8 is moved by ΔPs. This ratio ΔPs / ΔLs must be multiplied by the lens correction performance parameter as the effectiveness k.

  FIG. 3 is a diagram illustrating an example of the relationship between the output value of the focus encoder 52 and the shake correction effectiveness ratio k1 due to focus. FIG. 4 is a diagram illustrating an example of the relationship between the output value of the zoom encoder 50 and the shake correction effectiveness rate k2 due to zooming.

  FIG. 3 shows that, for example, when the output pattern of the focus encoder 52 is “00001”, the shooting distance is 0.35 m, and the shake correction effectiveness ratio k1 at this time is 1.27 times. Yes. Similarly, FIG. 4 shows that, for example, when the output pattern of the zoom encoder 50 is “00001”, the focal length f is 28 mm, and the shake correction effectiveness rate k2 at this time is 0.52 times. Show. The effectiveness k that is a combination of these effectiveness k1, k2 is given by the product of k1 and k2.

  Furthermore, since the image formed on the image sensor 8 is also affected by the converter lens 6, it is necessary to convert the lens correction performance parameter and the holding state parameter by the magnification d of the converter lens 6.

  Next, the maximum shake angular velocity and the maximum shake angle, which are the holding state parameters, will be described with reference to FIG. FIG. 5 is a graph showing an example of the time-series waveform of the angular velocity detected by the lens side gyroscope with a solid line and the time-series waveform of the angle calculated from the angular velocity shown with a broken line.

  As shown in FIG. 5, the lens control unit 56 always holds the latest angular velocity data and angle data over a predetermined time detected by the lens side gyro. When the release button 22 is pressed at time t1 in FIG. 5, the lens control unit 56 extracts the maximum shake angular velocity v and the maximum shake angle e in the past predetermined period T from the time t0 that is a predetermined time before the time t1. . That is, the lens control unit 56 extracts the positive maximum amplitude v1 and the negative maximum amplitude v2 of the angular velocity in the predetermined period T, and sets the larger absolute value of these maximum amplitudes as the maximum shake angular velocity v. Further, the lens control unit 56 sets the maximum amplitude (both amplitudes) of the shake angle in the predetermined period T as the maximum shake angle e.

  Next, the format of data for transferring each parameter will be described. In the present embodiment, by taking the logarithm of each of the above parameters, the data is converted into an exponential format, and this data is transferred to the camera body 2.

That is, each parameter is
A _L = 32 × log ₂ a _L ,
R _L = 32 × log ₂ r _L ,
S _L = 32 × log ₂ s _L ,
B _L = 32 × log ₂ b _L −128,
Q _L = 32 × log ₂ q _L ,
I _L = 32 × log ₂ i _L +256,
A _B = 32 × log ₂ a _B
R _B = 32 × log ₂ r _B ,
S _B = 32 × log ₂ s _B
B _B = 32 × log ₂ b _B −128,
Q _B = 32 × log ₂ q _B ,
F = 32 × log ₂ f−64,
K = 32 × log ₂ k,
D = 32 × log ₂ d
E = 32 × log ₂ e
V = 32 × log ₂ v
Is converted to By this conversion, each parameter is scaled to an integer value of 0 to 255. In addition, since each parameter is converted into an exponent title, multiplication of each parameter can be calculated by the sum of the exponent title data, and division can be calculated by a difference.

  Next, with reference to FIG. 6, the procedure for selecting the camera shake correction function by the camera shake correction function selecting means 60d will be described. FIG. 6 is a flowchart showing the selection procedure. The process according to this flowchart is started when the release button 22 is pressed.

  First, in step S <b> 1 of FIG. 6, the output of the focus encoder 52 and the output of the zoom encoder 50 are acquired by the lens control unit 56. These output values are converted as shown in FIGS. 3 and 4, converted into exponential form, and added to calculate the effectiveness. The exponential efficiency K is transferred to the camera body 2 via each connector. Further, the effective focal length f of the interchangeable lens 4 is also converted into an exponential format and transferred to the camera body 2. These data are input to the imaging condition input means 60b of the camera shake correction control device 60. Accordingly, the lens control unit 56 functions as an imaging condition output unit.

Next, in step S2, the lens stored in the lens memory 56a correction performance parameter a is interchangeable lens correction control response parameter a _L, the interchangeable lens correction control resolution parameter r _L, the interchangeable lens correction control stability parameter s _L The interchangeable lens resolution parameter q _L , the interchangeable lens maximum correction amount parameter b _L , and the interchangeable lens moment of inertia parameter i _L are transferred as index-denoted data, respectively. These data are input to the lens performance input means 60a of the camera shake correction control device 60. Accordingly, the lens control unit 56 functions as a lens performance output unit.

  In step S3, the maximum angular velocity and the maximum angle extracted by the lens control unit 56 are converted into exponential data V and E and transferred. The maximum angular velocity and the maximum angle, which are these holding state parameters, are input to the holding state input unit 60e of the camera shake correction control device 60. Accordingly, the lens control unit 56 functions as a holding state output unit. Further, in step S4, the converter magnification d stored in the converter memory 30a is transferred as exponential data.

Next, in step S5, a camera body correction control responsiveness parameter a _B which is a body correction performance parameter stored in the body memory 24a, a camera body correction control resolution parameter r _B , a camera body correction control stability parameter s _B , The image sensor resolution parameter q _B and the camera body maximum correction amount parameter b _B are transferred as index-denoted data, respectively. These data are input to the body performance input means 60c of the camera shake correction control device 60. Further, the exposure time set in the camera body 2 is input to the imaging condition input means 60 b of the camera shake correction control device 60.

Next, in step S6, the camera shake correction function selecting unit 60d adds the effective focal length F and the magnification D of the converter lens 6 to the transferred maximum shake angular velocity V of the exponent, and this is added to the shake angular velocity in the image sensor. Convert. Further, in step S6, it is determined whether or not the following conditional expression 1 is satisfied.
Conditional expression 1:
((V + F + D) <A _B ) AND ((V + F + D) <A _L )
If this conditional expression 1 is satisfied, the process proceeds to step S7, and if not satisfied, the process proceeds to step S8. That is, if the interchangeable lens correction control response parameter A _L and the camera body correction control response parameter _AB are smaller than the maximum shake angular velocity (V + F + D), the process proceeds to step S8. This corresponds to a case where neither the camera body nor the shake correction function of the interchangeable lens can sufficiently respond to the currently occurring maximum shake angular velocity.

In step S8, the interchangeable lens correction control responsiveness parameter A _L and the camera body correction control response parameter A _B are compared, is greater than the exchange lens correction control response parameter A _L camera body correction control response parameter A _B If (excellent), the process proceeds to step S9, and the camera body shake correction function is selected. Conversely, when the interchangeable lens correction control response parameter A _L is larger than the camera body correction control response parameter A _B where (superior), the process proceeds to step S10, image stabilization function of the exchange lens is selected. That is, since the camera shake correction function cannot sufficiently respond to the currently occurring shake angular velocity, the one having better responsiveness is selected to reduce the occurrence of camera shake.

On the other hand, when the conditional expression 1 is satisfied in step S6, the process proceeds to step S7. In step S7, the camera shake correction function selecting unit 60d of the camera shake correction control device 60 determines the interchangeable lens resolution parameter q _L and the converter lens 6. The product (Q _L + D) of the magnification d is calculated. In addition, the camera shake correction function selection unit 60d adds the effective focal length F and the magnification D of the converter lens 6 to the transferred maximum shake angle E of the exponent. By dividing this maximum shake angle (F + D + E) by 16 (subtracting 4 in the exponential notation), the maximum shake amount that is considered to remain on the image sensor 8 is calculated. That is, in the present embodiment, the camera shake correction function of the camera body or the interchangeable lens is expected to reduce the shake amount to about four steps, that is, to reduce the shake amount to about 1/16. . Therefore, by multiplying the maximum shake angle by 1/16, which is a reduction rate, the maximum shake amount assumed to remain on the image sensor 8 is calculated.

Next, the camera shake correction function selecting unit 60d compares the interchangeable lens resolution parameter (Q _L + D), the maximum shake angle (F + D + E-4), and the image sensor resolution parameter (Q _B ) to determine the minimum resolution q _min . . That is, the lowest resolution q _{min that} can be realized in the camera system 1 is selected from among the resolution of the interchangeable lens, the expected maximum deflection angle, and the resolution of the image sensor.

Further, the camera shake correction function selection means 60d has a value obtained by multiplying the product (D + F + S _L ) of the interchangeable lens correction control stability parameter s _L , the effective focal length f of the interchangeable lens, and the magnification d of the converter lens 6 by the exposure time. The interchangeable lens correction control resolution parameter r _L (R _L ) is compared to determine the interchangeable lens correction resolution R _Lmin . That is, the resolution based on the stability of the interchangeable lens correction control is compared with the resolution of the interchangeable lens correction control, and the lower resolution is selected as the interchangeable lens correction resolution R _Lmin that is the minimum resolution that can be realized in the camera system 1. To do.

Furthermore, the camera shake correction function selection unit 60d compares the value obtained by multiplying the camera body correction control stability parameter s _B by the exposure time with the camera body correction control resolution parameter r _B to determine the camera body correction resolution R _Bmin . . That is, the resolution based on the stability of the camera body correction control is compared with the resolution of the camera body correction control, and the lower resolution is selected as the camera body correction resolution R _Bmin that is the minimum resolution that can be realized in the camera system 1. To do.

Next, in step S11, it is determined whether the following conditional expression 2 is satisfied.
Conditional expression 2:
(Q _min > R _Lmin ) AND (q _min > R _Bmin ) AND (R _Lmin = R _Bmin )
If the conditional expression 2 is satisfied, the process proceeds to step S12. If not satisfied, the process proceeds to step S13. That is, when the interchangeable lens correction resolution R _Lmin and the camera body correction resolution R _Bmin are lower (inferior) than the minimum resolution q _min and the interchangeable lens correction resolution R _Lmin and the camera body correction resolution R _Bmin are not equal, Proceed to step S13.

In step S13, the interchangeable lens correction resolution R _Lmin and the camera body correction resolution R _Bmin are compared. If the camera body correction resolution R _Bmin is smaller (excellent) than the interchangeable lens correction resolution R _{Lmin, the process proceeds} to step S9. The camera shake correction function of the camera body is selected. On the other hand, if the interchangeable lens correction resolution R _Lmin is smaller (excellent) than the camera body correction resolution R _Bmin , the process proceeds to step S10, and the camera shake correction function of the interchangeable lens is selected. That is, when the correction resolution of the camera body and the interchangeable lens is inferior to the minimum resolution, the camera shake correction control with the better correction resolution is used to prevent the resolution from being lowered.

On the other hand, if conditional expression 2 is satisfied in step S11, the process proceeds to step S12. In step S12, the product of the magnification d of the converter lens 6 and the effective focal length f of the interchangeable lens is obtained as the interchangeable lens inertia moment parameter i. _The moment of inertia transfer data (D + F−I _L ), which is a value divided by _L , is calculated. Further, the magnification d converter lens 6, and the effectiveness factor k, an interchangeable lens correction control responsiveness parameter a _L product (D + K + A _L) interchangeable lens responsive transferred data is calculated.

Next, in step S14, it is determined whether or not the following conditional expression 3 is satisfied.
Conditional expression 3:
((D + F-I _L ) <(D + K + A _L )) AND ((D + F-I _L ) <A _B ) AND ((D + K + A _L ) = A _B )
If the conditional expression 3 is satisfied, the process proceeds to step S15. If not satisfied, the process proceeds to step S16. That is, the interchangeable lens responsiveness transfer data (D + K + _AL ) and the camera body responsiveness transfer data _AB are both larger than the moment of inertia transfer data (D + F- _IL ), and the interchangeable lens responsiveness transfer data (D + K + _AL ) and the camera. If the body responsiveness transfer data _AB is equal, the process proceeds to step S16.

That is, high response of the interchangeable lens and the camera body (superior), the process proceeds to step S15 if there is no difference between them, in step S15, the interchangeable lens maximum maximum correction amount parameter b _L and a camera body The correction amount parameter b _B is compared, and the shake correction control function with the larger correction amount (large stroke) is selected.

On the other hand, if conditional expression 2 is not satisfied in step S14, that is, the reciprocal of the moment of inertia of the interchangeable lens is large and camera shake is likely to occur, or the interchangeable lens response transfer data and the camera body response transfer data are different. If yes, the process proceeds to step S16. In step S16, the interchangeable lens responsiveness transfer data (D + K + A _L ) and the camera body responsiveness transfer data _AB are compared, and the shake correction control function with the higher responsiveness (excellent) is selected.

  According to the camera shake correction control apparatus of the embodiment of the present invention, the camera shake correction function selection unit selects the camera shake correction function with reference to the holding state parameters such as the shake angle and the shake angular velocity, and thus the nature of the generated camera shake. Accordingly, the camera shake correction function provided in the camera body and the interchangeable lens can be appropriately selected.

  Further, according to the camera shake correction control apparatus of the present embodiment, since the maximum shake angular velocity is included in the holding state parameter, it is possible to appropriately select the camera shake correction function according to the nature of the camera shake.

  Further, according to the camera shake correction control device of the present embodiment, when the camera shake angular velocity is large, the camera shake correction function of the camera body or the interchangeable lens is selected with emphasis on responsiveness, and when the camera shake angular velocity is low. Since the selection is made with an emphasis on resolution, an appropriate selection of the camera shake correction function can be performed.

  Further, according to the camera shake correction control apparatus of the present embodiment, the camera shake correction function selecting unit uses the value obtained by multiplying the maximum shake angle by the reduction rate of the camera shake angle expected by the camera shake correction of the camera system. Since the selection is made, the camera shake correction function can be selected based on the shake angle that is considered to remain after correction by the camera shake correction function.

  Furthermore, according to the camera shake correction control apparatus of the present embodiment, since the value obtained by multiplying the stability parameter by the exposure time is used for selecting the camera shake correction function, the parameter relating to the stability of the control is effectively used for evaluation. can do.

  Further, according to the camera shake correction control device of the present embodiment, the lens correction performance parameter is converted according to the magnification of the converter lens, so that the influence of the converter lens can be accurately evaluated.

  Furthermore, according to the camera shake correction control apparatus of the present embodiment, since the moment of inertia of the interchangeable lens is included in the lens correction performance parameter, it is possible to evaluate whether or not the interchangeable lens itself is physically easy to shake.

  As mentioned above, although preferable embodiment of this invention was described, a various change can be added to embodiment mentioned above. In particular, in the above-described embodiment, the camera shake correction control device is included on the camera body side, but the camera shake correction control device may be incorporated in the interchangeable lens or the converter lens.

  In the above-described embodiment, the converter lens is included in the camera system, but the converter lens may not be included. In this case, the above embodiment can be applied as it is by setting the magnification d of the converter lens to 1 (exponentially labeled magnification D = 0).

  Further, in the above-described embodiment, the lens correction performance parameter and the efficacy rate are transferred from the interchangeable lens to the camera body, where the lens correction performance parameter and the efficacy rate are multiplied. However, the lens correction performance parameter and the efficacy rate are exchanged. The data may be multiplied in the lens and transferred to the camera body. Similarly, in the above-described embodiment, the magnification of the converter lens is transferred to the camera body, and here the lens correction performance parameter and the magnification are multiplied. However, the lens correction performance parameter and the magnification transferred from the interchangeable lens are converted to the converter lens. It is also possible to multiply this data and transfer this data to the camera body.

It is a block diagram which shows the whole camera system controlled by the camera-shake correction control apparatus by embodiment of this invention. It is explanatory drawing of an effectiveness. It is a figure which shows an example of the relationship between the output value of a focus encoder, and the shake correction effect rate by focus. It is a figure which shows an example of the relationship between the output value of a zoom encoder, and the shake correction effect rate by zoom. It is the graph which showed the example of the time series waveform of the angular velocity detected by the lens side gyro by the solid line, and showed the time series waveform of the angle calculated from this angular velocity by the broken line. It is a flowchart which shows the selection procedure of the camera-shake correction function by a camera-shake correction function selection means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Camera system 2 Camera body 4 Interchangeable lens 6 Converter lens 8 Image pick-up element 10 Image pick-up element actuator 12 Shutter 14a, 14b Body side gyro 16 Mirror 18 Penta prism 20 Diopter correction lens 22 Release button 24 Body control part 24a Body memory 26 Body side Mount connector 28 Lens for conversion 30 Converter control unit 30a Converter memory 32 Converter-body mount connector 34 Converter-interchangeable lens mount connector 35 Lens barrel 36 Zoom lens 38 Imaging lens 40 Focus adjustment lens 42 Imaging lens 44 Image shake Lens for correction 46 Lens actuator 48a, 48b Lens side gyro 50 Zoom encoder 52 Focus encoder 54 Aperture 56 lens control unit 56a lens memory 58 lens side mount connector 60 camera shake correction control device 60a lens performance input means 60b imaging condition input means 60c body performance input means 60d camera shake correction function selection means 60e holding state input means a _L interchangeable lens correction Control response parameter r _L interchangeable lens correction control resolution parameter s _L interchangeable lens correction control stability parameter q _L interchangeable lens resolution parameter b _L interchangeable lens maximum correction amount parameter i _L interchangeable lens moment of inertia parameter a _B Camera body correction control response Parameter r _B camera body correction control resolution parameter s _B camera body correction control stability parameter q _B image sensor resolution parameter b _B camera body maximum correction amount parameter q _min minimum resolution R _Lmin interchangeable lens correction resolution R _Bmin camera body correction resolution

Claims (8)

A camera shake correction control apparatus for controlling camera shake correction by a camera system including a camera body having a camera shake correction function and an interchangeable lens having a camera shake correction function,
Body performance input means for inputting body correction performance parameters representing the camera shake correction performance of the camera body;
Lens performance input means for inputting a lens correction performance parameter representing the camera shake correction performance of the interchangeable lens;
Holding state input means for inputting a holding state parameter indicating the holding state of the camera system;
Based on the input body correction performance parameter, the lens correction performance parameter, and the holding state parameter, a camera shake correction function selection unit that selects a camera shake correction function of the camera body or a camera shake correction function of the interchangeable lens;
A camera shake correction control apparatus comprising:   The camera shake correction control apparatus according to claim 1, wherein the holding state parameter includes a maximum shake angular velocity in a predetermined period before imaging.   The body correction performance parameter includes a camera body correction resolution indicating the resolution of camera shake correction control executable in the camera body, and a camera body correction control responsiveness parameter indicating the response of camera shake correction control in the camera body. The lens correction performance parameter includes an interchangeable lens correction resolution that represents the resolution of the camera shake correction control that can be executed in the interchangeable lens, and an interchangeable lens correction control responsiveness parameter that represents the responsiveness of the camera shake correction control in the interchangeable lens. And the camera shake correction function selecting means has a higher camera shake correction function when the maximum shake angular velocity is larger than the camera body correction control response parameter or the interchangeable lens correction control response parameter. Select the above and the maximum deflection angular velocity is the above camera 3. The camera shake correction control according to claim 2, wherein a camera shake correction function is selected based on the camera body correction resolution and the interchangeable lens correction resolution when the di correction control response parameter and the interchangeable lens correction control response parameter are smaller. apparatus.   The holding state parameter includes a maximum shake angle in a predetermined period before imaging, and the camera shake correction function selecting unit sets a reduction rate of a shake angle expected by camera shake correction of the camera system to the maximum shake angle. The camera shake correction control apparatus according to claim 1, wherein the camera shake correction function is selected using the multiplied value.   The camera shake correction function selection means receives an exposure time of an image to be shot, and the body correction performance parameter includes a camera body correction control stability parameter indicating the stability of the camera body correction control. The lens correction performance parameter includes an interchangeable lens correction control stability parameter indicating the stability of the correction control of the interchangeable lens, and the camera shake correction function selecting means determines the camera shake correction performance of the camera body and the exposure exposure. Evaluate using time multiplied by the camera body correction control stability parameter, and use the value obtained by multiplying the camera shake correction performance of the interchangeable lens by the exposure time and the interchangeable lens correction control stability parameter. The camera shake correction control apparatus according to any one of claims 1 to 4, wherein the camera shake correction control apparatus is evaluated.   The camera system further includes a converter lens mounted between the camera body and the interchangeable lens, and the body correction performance parameter or the lens correction performance parameter is transmitted via the converter lens and the converter 6. The camera shake correction control device according to claim 1, wherein the camera shake correction control device is converted according to a magnification of the lens. A camera body with a camera shake correction function,
The camera body,
An image sensor disposed inside the camera body,
The camera shake correction control device according to any one of claims 1 to 6,
A camera body characterized by comprising: An interchangeable lens used by being attached to a camera body provided with the camera shake correction control device according to any one of claims 1 to 6,
A lens barrel;
An imaging lens disposed inside the lens barrel;
Lens performance output means for outputting a lens correction performance parameter representing the camera shake correction performance of the interchangeable lens to the camera shake correction control device;
Holding state output means for outputting a holding state parameter indicating a holding state of the camera system to the camera shake correction control device;
An interchangeable lens comprising:

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