JP2013054316A - Blur correction device and optical apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blur correction device and an optical apparatus which enable good blur correction.SOLUTION: A blur correction device 30 includes: an angular velocity detection part 25 which detects an angular velocity acting on an optical apparatus 1; a signal extraction part 61 which extracts and outputs a predetermined frequency component from the detection signal ω0 by the angular velocity detection part 25; a gain adjustment part 62 which adjusts a gain of the output signal ω3 of the signal extraction part 61 and outputs it; and a calculation part 41 which calculates a blur correction amount on the basis of the detection signal ω0 by the angular velocity detection part 25 and the output signal ω5 of the gain adjustment part 62.

Description

  The present invention relates to a shake correction apparatus and an optical apparatus.

Some imaging optical devices have a blur correction function for correcting blur of the imaging optical device due to camera shake or the like.
The blur correction is, for example, calculating the blur amount of the imaging optical device from the angular velocity information detected by the angle sensor provided in two directions of pitch and yaw, and correcting the blur on the imaging surface based on the calculation result. Move the optical system.
By the way, at the time of high-magnification photographing, the influence of translational blurring becomes large in addition to rotational blurring. With only the angular velocity information from the angular velocity sensor as described above, translational blur cannot be detected correctly, and high-precision blur correction control cannot be performed. For this reason, a configuration is known in which an acceleration sensor is provided in addition to the angular velocity sensor, and the vibration blur accuracy at the time of high-magnification shooting is improved by calculating and correcting the translational blur component from the output (Patent Document 1). reference).

JP 7-225405 A

  However, the configuration including an acceleration sensor in addition to the angular velocity sensor as described above has a problem that the shake correction system is complicated and time is required for calculation.

  An object of the present invention is to provide a shake correction apparatus and an optical apparatus that can perform good shake correction.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.

According to the first aspect of the present invention, an angular velocity detector (25) for detecting an angular velocity acting on the optical device (1) and a predetermined frequency component are extracted from a detection signal (ω0) from the angular velocity detector (25). Output signal extraction unit (61), gain adjustment unit (62) for adjusting and outputting the output signal (ω3) of the signal extraction unit (61), and detection signal (25) by the angular velocity detection unit (25) and a calculation unit (41) for calculating a blur correction amount based on the output signal (ω5) of the gain adjustment unit (62).
Invention of Claim 2 is the blurring correction apparatus of Claim 1, Comprising: The said gain adjustment part (62) changes a gain according to the magnification of the said optical apparatus (1), It is characterized by the above-mentioned. The shake correction device (30).
Invention of Claim 3 is the blurring correction apparatus of Claim 1 or 2, Comprising: The said angular velocity detection part (25) is a 1st detection part (25P) which detects the angular velocity in a 1st direction. And a second detection unit (25Y) that detects an angular velocity in a direction intersecting the first direction, and the gain adjustment unit (62) is configured to detect the signal extraction unit (61) in the first direction. The blur correction device (30) is characterized in that the output signal and the output signal of the signal extraction unit (61) in the second direction are gain-adjusted with different gains.
A fourth aspect of the present invention is the shake correction apparatus according to any one of the first to third aspects, wherein the signal extraction unit (61A, 61B) is a detection signal from the angular velocity detection unit (25). A plurality of frequency components (ω3, ω3 ′) are extracted from the output and output, and the gain adjusting unit (62A, 62B) adjusts the gain with a different gain in each frequency component. (30).
A fifth aspect of the present invention is the blur correction device according to any one of the first to fourth aspects, wherein the blur correction unit performs image blur correction based on a calculation result of the calculation unit (41). (VL) is a blur correction device (30).
According to a sixth aspect of the present invention, in the blur correction device according to any one of the first to fifth aspects, the frequency component extracted by the signal extraction unit (61) includes the phase of the angular blur and the translational blur. The blur correction device (30) is characterized in that the phase is set in a frequency band substantially corresponding to the phase.
The invention according to claim 7 is the shake correction apparatus according to claim 6, wherein the frequency component extracted by the signal extraction unit (61) is set to a frequency band including 2 Hz. The shake correction device (30).
Invention of Claim 8 is an optical instrument (1) provided with the blurring correction apparatus (30) of Claims 1-7.

  ADVANTAGE OF THE INVENTION According to this invention, the blurring correction apparatus and optical instrument which can perform favorable blurring correction can be provided.

It is a figure which shows schematic structure of the camera to which one Embodiment of this invention is applied. It is a perspective view of the camera explaining blur correction. It is a functional block diagram of a shake correction control unit in the camera. It is a circuit block diagram of a target speed calculation part. It is a figure explaining the relationship between a camera shake and the shake amount on an imaging surface. It is explanatory drawing which considered translational blurring as blurring of a rotation center back side from an imaging surface. It is explanatory drawing which considered translational blurring as blurring of the rotation center ahead of an imaging surface. It is a graph which shows an example of the blurring waveform by hand. It is the figure which showed the spectrum distribution of angle blurring and translation blurring. It is a figure which shows the correlation of angle blurring and translation blurring. It is a graph which shows the waveform which extracted the blurring of 2 Hz from the graph of FIG. It is a graph which shows the comparison of the error amount in the imaging surface of the blurring correction control of this application structure, and the conventional blurring correction control. It is a graph which shows the correlation in the 2Hz component of the angle blurring of a pitch direction and a yaw direction, and translation blurring. It is the circuit block diagram and gain graph of the target speed calculating part in 3rd Embodiment.

(First embodiment)
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing a schematic configuration of a camera 1 to which an embodiment of the present invention is applied. FIG. 2 is a perspective view of the camera 1 for explaining the blur correction. FIG. 3 is a functional block diagram of the shake correction device 30 in the camera 1. The camera 1 is an electronic still camera that outputs image data obtained by converting a subject image into an electrical signal.

  As shown in FIG. 1, the camera 1 includes a camera body 10 and a lens barrel 20 that can be attached to and detached from the camera body 10. Note that the present invention is not limited to such a lens detachable camera, and may be applied to a camera in which a camera body and a lens are integrally configured.

  The camera body 10 includes a CPU 11, an image sensor 12, a shutter 13, a signal processing circuit 14, an EFPROM 15, an AF sensor 16, a recording medium 17, and the like. Further, a display device 18 is disposed on the back surface of the camera body 10, and an operation member 19 is provided on the upper surface of the camera body 10.

The CPU 11 calculates the movement amount of a zoom lens group ZL and a focus lens group FL in a lens barrel 20 described later, and controls the camera 1 as a whole.
The imaging element 12 is a photoelectric conversion element such as a CCD or a CMOS that converts an image formed on the imaging surface by the imaging optical system of the lens barrel 20 into an electrical signal and outputs the electrical signal. The image pickup device 12 is fixed to the camera housing in a posture in which the image pickup surface is orthogonal to the optical axis OA of the lens barrel 20. The image sensor 12 outputs image data to the signal processing circuit 14 based on an input from the image sensor drive circuit.

The shutter 13 adjusts the exposure time by shielding and passing photographing light from the imaging optical system of the lens barrel 20 toward the image sensor 12.
The signal processing circuit 14 receives the output from the image sensor 12 and performs noise processing, A / D conversion, and the like.
The EFPROM 15 has adjustment value information such as a gain value of an angular velocity sensor 25 described later provided in the lens barrel 20 and outputs the adjustment value information to the CPU 11.
The AF sensor 16 is a CCD line sensor or the like for performing focus detection.

The recording medium 17 is a memory such as an SD card or a CF card that can be attached to and detached from a slot provided in the camera body 10, and records image information output from the CPU 11.
The display device 18 is configured by a liquid crystal panel or the like, and displays a menu related to the setting of the camera 1, a through image captured by the image sensor 12, a captured image, and the like.
The operation member 19 is a switch for operating the shutter drive timing, and outputs a half-press and full-press signal to the CPU 11.

  The lens barrel 20 includes a zoom lens group ZL, a focus lens group FL, a shake correction lens group VL, and a diaphragm mechanism D, and constitutes an imaging optical system. The lens barrel 20 includes a zoom drive mechanism 21, a focus drive mechanism 22, a shake correction drive mechanism 23, an aperture drive mechanism 24, and an angular velocity sensor 25.

The zoom lens group ZL is a lens group that moves in the direction of the optical axis OA and changes the focal length of the lens barrel 20. The zoom lens group ZL is driven to move by the zoom drive mechanism 21.
The focus lens group FL is a lens group that moves in the direction of the optical axis OA and changes the imaging position of the lens barrel 20. The focus lens group FL is driven to move by the focus drive mechanism 22.

The blur correction lens group VL is a lens group that moves in a plane orthogonal to the optical axis OA and changes the imaging position of the lens barrel 20. The blur correction lens group VL is driven to move by the blur correction drive mechanism 23. This blur correction lens group VL constitutes a blur correction device 30 described later.
The aperture mechanism D is a mechanism that controls the amount of exposure light reaching the image sensor 12 from the lens barrel 20. The aperture mechanism D is driven by the aperture drive mechanism 24.

The zoom drive mechanism 21 is a mechanism for moving and driving the zoom lens group ZL, and is controlled by the CPU 11 of the camera body 10.
The focus drive mechanism 22 is a mechanism for moving and driving the focus lens group FL, and is controlled by the CPU 11 of the camera body 10.

  The blur correction drive mechanism 23 is a mechanism for moving and driving the blur correction lens group VL, and is controlled by the CPU 11 of the camera body 10. In the present embodiment, as shown in FIG. 2, the blur correction drive mechanism 23 is horizontally positioned at a position where the photographer takes a horizontally long image with the optical axis OA being horizontal (hereinafter referred to as a normal position). A blur correction drive mechanism 23X for moving and driving the blur correction lens group VL in the X-axis direction, which is a normal direction, and a blur correction drive mechanism 23Y for moving and driving the blur correction lens group VL in the Y-axis direction which is the vertical direction in the normal position It has. The following description will be made as the shake correction drive mechanism 23 unless otherwise required. The shake correction drive mechanism 23 constitutes a shake correction device 30 described later.

The aperture drive mechanism 24 is a mechanism that drives the aperture mechanism D, and is controlled by the CPU 11 of the camera body 10.
The angular velocity sensor 25 detects the angular velocity of the blur generated in the lens barrel 20 and outputs it to the CPU 11 of the camera body 10 as blur correction control information. In this embodiment, as shown in FIG. 2, the angular velocity sensor 25 includes two sets of an angular velocity sensor 25P that detects an angular velocity (pitch) around the X axis and an angular velocity sensor 25Y that detects an angular velocity (yaw) around the Y axis. It has. Hereinafter, the angular velocity sensor 25 will be described unless otherwise required. The angular velocity sensor 25 constitutes a shake correction device 30 described later.

  In the camera 1, the lens barrel 20 forms subject image light on the image pickup surface of the image pickup device 12, and the image information of the subject converted into an electric signal by the image pickup device 12 by the pressing operation of the operation member 19 by the photographer. Is recorded (photographed) on the recording medium 17. All the operation control in the camera 1 including the photographing is performed by the CPU 11.

  At the time of shooting, the focus lens group FL is AF driven so as to form an image on the imaging surface of the imaging element 12 by the focus driving mechanism 22. The AF driving of the focus lens group FL is controlled by the CPU 11 based on the focus detection information of the AF sensor 16. Control information such as the subject distance, shooting magnification, and focal length information acquired during the AF control is used as lens state information during the blur correction control described later.

Here, as shown in FIG. 3, the camera 1 includes a shake correction device 30 that corrects camera shake.
Next, the blur correction device 30 will be described with reference to FIGS. 4 to 12 in addition to FIGS. 1 to 3 described above.
FIG. 4 is a circuit block diagram of the target speed calculation unit 50 in the shake correction control unit 40 of the shake correction apparatus 30. FIG. 5 is a diagram illustrating the relationship between camera shake and the amount of shake on the imaging surface. FIG. 6 is an explanatory diagram in which translational blur is regarded as blur at the center of rotation behind the imaging surface. FIG. 7 is an explanatory diagram in which translational blur is regarded as blur at the front rotation center from the imaging surface. FIG. 8 is a graph showing an example of a hand-held blur waveform. FIG. 9 is a diagram showing the spectral distribution of angular blur and translational blur. FIG. 10 is a diagram showing the correlation between angle blurring and translational blurring. FIG. 11 is a graph showing waveforms obtained by extracting a blur of 2 Hz from the graph of FIG. FIG. 12 is a graph showing a comparison of error amounts on the imaging surface between the blur correction control of the present configuration and the conventional blur correction control.

  In addition, as shown in FIG. 2, the shake correction apparatus 30 in the present embodiment detects the angular velocity in the pitch direction around the X axis and the yaw direction around the Y axis by using the angular velocity sensors 25P and 25Y, and performs shake correction control. Is to do. Accordingly, although there are two blur correction control systems in the pitch direction and the yaw direction, the following description will be made as one blur correction control system (blur correction control unit 40).

As shown in FIG. 3, the shake correction device 30 includes a shake correction lens group VL, a shake correction drive mechanism 23, an angular velocity sensor 25, a lens position detection unit 26, and a shake correction control unit 40 that is a functional unit of the CPU 11. And is constituted by.
Then, in the shake correction device 30, the shake correction control unit 40 cancels out the blur of the subject image on the light receiving surface of the image sensor 12 based on the angular velocity detection information of the blur acting on the lens barrel 20 by the angular velocity sensor 25. As described above, the blur correction lens group VL is driven to move by the blur correction drive mechanism 23.
Here, the blur correction device 30 in the present embodiment corrects translational blur in addition to angular blur based on the angular velocity detection information of the blur acting on the lens barrel 20 detected by the angular velocity sensor 25.

First, with reference to FIG. 5, the extraction of the translational blur element from the angular velocity detection information of the blur by the angular velocity sensor 25 will be described.
FIG. 5A shows the relationship between the angle blur and the blur amount on the imaging surface. When blurring of the angle θ occurs around the imaging surface, the blur amount Di on the imaging surface is
Di = β · R · θ
It is represented by Β: imaging magnification (= b / D), R: subject distance.

FIG. 5B shows the relationship between the translational blur and the blur amount on the imaging surface. When translational blur: l occurs, the blur amount on the imaging surface: Di is
Di = β · l
It is represented by Β: imaging magnification (b / D), approximately 1/10 or more in the case of macro.
From the above, the amount of blurring Di on the imaging surface when the angle blurring θ and the translational blurring l occur simultaneously is:
Di = β · R · θ + β · l

FIG. 5 (c) is to obtain the rotation center position by regarding the translational blur as the blur at the rotation center. When translational blur: l occurs, the blur amount Di on the imaging surface is:
Di = β · (R−n) · θ
= Β · R · θ-β · n · θ Equation 1
From FIG. 5C, the relationship between the rotation center position and the translational blur is
nθ = l
It can be expressed as.

In other words, the translation blur is regarded as the rotation center blur, and the blur amount on the imaging surface is obtained by the above-described formula 1, and the first term (β · R · θ) in formula 1 is the angular blur and the second term ( β · n · θ) represents translational blur.
Since Equation 1 represents the amount of blur on the imaging surface, translational blur is a blur that cancels angular blur if the rotation center position is on the subject side, and the rotation center position is on the photographer side. If it exists, it can be said that translational blur is a blur that amplifies angular blur.

That is, as shown in FIG. 6A, when the rotation center position RC is on the photographer side from the imaging surface 12A, the amount of angular blur shown in FIG. The translation blur amount shown in FIG. 6 is added to increase the blur amount on the imaging surface 12A as shown in FIG.
On the other hand, as shown in FIG. 7A, when the rotation center position RC is on the subject side from the imaging surface 12A, the amount of angular blur shown in FIG. 7B and the amount shown in FIG. The amount of translation blur is offset, and the amount of blur on the imaging surface 12A is reduced as shown in FIG.

  In actual camera shake, various frequencies (about 10 Hz) are mixed, and the rotation center position irregularly changes between −∞ and + ∞. FIG. 8 shows an example of a hand-held blur waveform. (A) is the amount of blur on the imaging surface due to angle blur, (b) is the amount of blur on the imaging surface due to translation blur, and (c) is the addition of angle blur and translation blur. The amount of blurring on the imaged surface is shown.

Here, when focusing on a specific frequency band among the waveforms shown in FIGS. 8A to 8C, it was found that there is a correlation between angular blur and translational blur. FIG. 9 is a diagram showing the spectral distribution of angular blur and translational blur. FIG. 10 shows the correlation obtained from the angle blur and the translational pre-spectrum shown in FIG. In FIG. 10, the stronger the positive correlation is, the more the phase of angular blur and translation blur match. Further, the stronger the negative correlation, the more the phase between the angle blur and the translation blur is shifted by 180 °. As shown in FIG. 9, as shown in FIG. 10, in the vicinity of 2 Hz, it can be seen that the phase of angular blur and translational blur coincide and the positive correlation is strong.
FIGS. 11A to 11C show waveforms obtained by extracting the 2 Hz blur from FIGS. 8A to 8C, respectively. This data is for the pitch direction.

As described above, when the 2 Hz component is compared, the phases of translational blur and angular blur are in agreement. This indicates that the rotation center position is located on the photographer side when viewed from the imaging surface (imaging device 12). Regarding the frequency band of 1.5 to 4 Hz, although there are some individual differences and posture differences, they are generally in the above relationship. Regarding other frequency bands, there are large variations, and individual differences and attitude differences are also large.
Using such a relationship, it is possible to correct translational blur in a specific frequency band (1.5 to 4 Hz) using only the angular velocity signal from the angular velocity sensor 25.

In the shake correction device 30 according to the present embodiment, the shake correction control unit 40 extracts a 2 Hz component in which the phase of translational shake and angular shake match from the angular velocity signal of the angular velocity sensor 25, and corrects angular blur and translational blur. To do.
As shown in FIG. 3, the shake correction control unit 40 includes a target speed calculation unit 50, a target position conversion unit 41, and a follow-up control calculation unit 42.

The blur correction control unit 40 receives the angular velocity detection information of the blur by the angular velocity sensor 25 and the lens state information. The lens state information is subject distance, photographing magnification, and focal length information, and uses information acquired at the time of AF control.
Then, the blur correction control unit 40 calculates the target speed: Vc at which the target speed calculation unit 50 drives the blur correction lens group VL, and the target position conversion unit 31 integrates the target speed: Vc to correct the blur correction lens group VL. The target position is calculated. The follow-up control calculation unit 42 drives the blur correction driving mechanism 23 with reference to the lens position information from the lens position detection unit 26, and controls the movement of the blur correction lens group VL to the target position calculated by the target position conversion unit.

Next, the target speed calculation unit 50 will be described in detail.
As shown in FIG. 4, the target speed calculation unit 50 includes a high-pass filter unit 51, a translation blur extraction / addition unit 60, and a target speed target speed calculation unit 52.

  The high-pass filter unit 51 obtains ω1 by performing LPF processing (about fc = 0.1 Hz) with the low-pass filter 51A on the angular velocity signal: ω0 after A / D conversion, and subtracts ω1 from ω0, An angular velocity signal ω2 from which the DC component has been removed is obtained. Note that the angular velocity signal: ω2 obtained by removing the DC component from the angular velocity signal: ω0 by a high-pass filter may be obtained.

The translation blur extraction / addition unit 60 includes a band-pass filter 61 and a gain adjustment unit 62.
The translation blur extracting and adding unit 60 separates and extracts the frequency component (2 Hz): ω3 from the angular velocity signal: ω2 by the bandpass filter 61, and the gain adjusting unit 62 amplifies the frequency component: ω3 with a predetermined gain by the amplifier 62a. Then, the translational blur element frequency component: ω4 is obtained, and the translational blur element frequency component: ω5 is added to the angular velocity signal: ω4 from which the frequency component: ω3 is separated to obtain the target angular velocity signal: ω.

  The gain adjusting unit 62 determines the frequency component: ω3 separated and extracted by the bandpass filter 61 based on the photographing magnification information, as shown in FIG. 4B as an example of the gain with respect to the photographing magnification. Multiply the gain. This is because an error on the imaging surface due to translational blurring is proportional to the imaging magnification β, so that the magnitude of the gain is changed corresponding to the imaging magnification.

The target speed target speed calculation unit 52 drives the blur correction lens group VL based on the angular velocity signal ω obtained by the translation blur extraction and addition unit 60 and the subject distance, shooting magnification, and focal length information. : Calculate vc.
The target speed calculation formula for close-up shooting is:
R: Subject distance [mm]
β: photographing magnification K: lens specific value
vc = K ・ β ・ R ・ ω
Ask for.

  Then, as described above, the blur correction control unit 40 calculates the target position of the blur correction lens group VL by the target position conversion unit 31 integrating Vc based on the target speed Vc calculated by the target speed calculation unit 50. The tracking control calculation unit 42 drives the blur correction drive mechanism 23 with reference to the lens position information from the lens position detection unit 26, and moves the blur correction lens group VL to the target position calculated by the target position conversion unit 31. Control.

In the shake correction device 30 configured as described above, the shake correction control unit 40 corrects translational shake in a specific frequency band (2 Hz) in addition to angular shake using only the angular velocity signal from the angular velocity sensor 25. This can improve the blur correction effect.
FIG. 12 shows a comparison of error amounts on the imaging surface between the shake correction control by the shake correction control unit 40 of the configuration of the present application and the shake correction control to which the present embodiment is not applied.
Thus, it can be seen that in the shake correction control by the shake correction control unit 40 of the present application configuration, the error amount is suppressed as compared with the conventional shake correction control, and the shake correction effect is improved.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG.
Since the configuration of the shake correction apparatus in the second embodiment is exactly the same as that of the first embodiment described above, description thereof is omitted. The same reference numerals are used for the constituent elements.
In the second embodiment, different blur correction control is performed on two detection axes (pitch direction and yaw direction).

That is, the shake correction control unit 40 includes the target speed calculation unit 50 shown in FIG. 4A in the first embodiment described above in two systems, the pitch direction and the yaw direction. Thus, the gain adjusting unit 62 multiplies different gains.
As shown in FIG. 13 (a), the angle direction and the translational motion depend on the detection axis direction (the pitch direction or the yaw direction), as shown in FIG. This is because the blur ratio tends to be different.

That is, the magnitude of the angular blur and the translational blur in the pitch direction shown in FIG. 13A is approximately 1: 1, but the yaw direction shown in FIG. It can be seen that it tends to be slightly smaller, and the phase is shifted by a dozen degrees depending on the timing.
Therefore, as shown in FIG. 13C, the rate of change of the gain applied by the gain adjusting unit 62 with respect to the translational blur of 2 Hz with respect to the imaging magnification is made different between the pitch direction and the yaw direction, and the pitch direction> the yaw direction. Set to be.
Thereby, blur correction control with higher accuracy can be performed.

(Third embodiment)
Next, a third embodiment of the present invention shown in FIG. 14 will be described.
FIG. 14A is a circuit block diagram of a target speed calculation unit 50 ′ in the shake correction apparatus according to the third embodiment, and FIG. 14B shows a gain with respect to photographing magnification in the addition processing circuits 50A and 50B. The basic configuration of the shake correction apparatus is the same as that of the first embodiment, and the same reference numerals are used for the constituent elements.

  The translation blur extraction / addition unit 60 in the target speed calculation unit 50 ′ shown in FIG. 14 (a) includes a plurality of systems of addition processing circuits (first addition processing circuit 60A and second addition processing circuit 60B). In FIG. 14, the suffix of the component relating to the first addition processing circuit 60A is indicated by A, and the suffix of the component relating to the second addition processing circuit 60B is indicated by B. Further, the signal relating to the second addition processing circuit 60B is shown with “′” (dash).

  Then, in each of the addition processing circuits 50A and 50B, the frequency components ω3 and ω3 ′ extracted and separated from the angular velocity signal ω2 by the bandpass filters 61A and 51B are set to different frequencies (for example, 2 Hz and 4 Hz). As shown in FIG. 14B, the gains applied by the gain adjusting units 62A and 52B in the addition processing circuits 50A and 50B are different gains corresponding to the extracted and separated frequencies.

According to the shake correction apparatus of the third embodiment, translational shake in a plurality of frequency bands can be corrected, and translational shake in a wider range of frequencies can be corrected.
In addition, although the addition processing circuit in the translation blur extraction / addition unit 60 is two systems in the present embodiment, it is not limited to this and may be three systems or more.

As described above, this embodiment has the following effects.
(1) According to the blur correction unit 30 in this configuration, the target speed calculation unit 50 in the blur correction control unit 40 has a frequency at which the phase of translational blur and angular blur coincide with the angular velocity signal ω0 of the angular velocity sensor 25. By extracting the component and multiplying it by a predetermined gain and setting it as the target angular velocity signal: ω, it is possible to correct translational blurring in a specific frequency band in addition to angular blurring using only the angular velocity signal from the angular velocity sensor 25. As a result, the blur correction effect can be improved.

(Deformation)
The present invention is not limited to the above-described embodiment, and various modifications and changes as described below are possible, and these are also within the scope of the present invention.

(1) In the above embodiment, the shake correction control unit 40 of the shake correction device 30 extracts a frequency component in which the phases of translational shake and angular shake match in the same phase from the angular velocity signal of the angular velocity sensor 25, and obtains a predetermined gain. The frequency component to be extracted is applicable to any frequency that can be correlated even if the translational blur and the angular blur have an antiphase relationship.

(2) The above embodiment is applied to a configuration in which the blur correction lens group VL as the blur correction unit is moved by the blur correction drive mechanism 23 to perform the blur correction. However, the blur correction unit is not limited to this, and may be applied to a configuration in which an image sensor is moved to perform blur correction or a configuration in which blur correction is performed by image processing.
(3) In the above-described embodiment, the example in which the image blur of the image captured by the camera 1 which is an electronic still camera is corrected has been described. However, the present invention is not necessarily limited to this content. The present invention can also be applied to blur correction of images taken with a video camera that handles moving images.

  In addition, although embodiment and a deformation | transformation form can also be used in combination as appropriate, detailed description is abbreviate | omitted. Further, the present invention is not limited to the embodiment described above.

  1: camera, 10: camera body, 11: CPU, 12: imaging device, 12A: imaging surface, 20: lens barrel, 23: blur correction drive mechanism, 25: angular velocity sensor, 25P: angular velocity sensor, 25Y: angular velocity sensor , 26: lens position detection unit, 30: blur correction device, 40: blur correction control unit, 41: target position conversion unit, 42: follow-up control calculation unit, 50: target speed calculation unit, 51: high-pass filter unit, 52: Target speed calculation unit, 60: translation blur extraction / addition unit, 60A: first addition processing circuit, 60B: second addition processing circuit, 61, 61A, 61B: bandpass filter, 62, 62A, 62B: gain adjustment unit, VL : Blur correction lens group

Claims (8)

An angular velocity detector that detects an angular velocity acting on the optical device;
A signal extraction unit that extracts and outputs a predetermined frequency component from the detection signal by the angular velocity detection unit;
A gain adjusting unit for adjusting the gain of the output signal of the signal extracting unit and outputting it;
A calculation unit that calculates a blur correction amount based on a detection signal from the angular velocity detection unit and an output signal of the gain adjustment unit;
A blur correction device characterized by the above. The shake correction apparatus according to claim 1,
The gain adjusting unit changes the gain according to the magnification of the optical device;
A blur correction device characterized by the above. The shake correction apparatus according to claim 1 or 2,
The angular velocity detection unit includes a first detection unit that detects an angular velocity in a first direction, and a second detection unit that detects an angular velocity in a direction intersecting the first direction,
The gain adjustment unit adjusts the output signal of the signal extraction unit in a first direction and the output signal of the signal extraction unit in a second direction with different gains;
A blur correction device characterized by the above. The shake correction apparatus according to any one of claims 1 to 3,
The signal extraction unit extracts and outputs a plurality of frequency components from the detection signal from the angular velocity detection unit,
The gain adjusting unit adjusts the gain with a different gain in each frequency component;
A blur correction device characterized by the above. The shake correction apparatus according to any one of claims 1 to 4,
A blur correction unit that performs image blur correction based on the calculation result of the calculation unit;
A blur correction device characterized by the above. The blur correction device according to any one of claims 1 to 5,
The frequency component extracted by the signal extraction unit is set to a frequency band in which the phase of angular blur and the phase of translation blur substantially correspond,
A blur correction device characterized by the above. The blur correction device according to claim 6,
The frequency component extracted by the signal extraction unit is set to a frequency band including 2 Hz,
A blur correction device characterized by the above.   An optical apparatus comprising the shake correction apparatus according to claim 1.

Images