JP3096828B2 - camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, an optical device and the like.
To correct image blur caused by camera shake etc.
The present invention relates to a correction device.

[0002]

2. Description of the Related Art Generally, when photographing while holding a camera with a hand, if the camera vibrates due to camera shake or the like, image blur occurs in a photographed image and image quality is degraded. For this reason, recently, various cameras provided with image blur correction means for correcting image blur caused by vibrations such as camera shake are proposed.

FIGS. 7 to 9 are schematic diagrams showing an optical system of a known photographing apparatus provided with an image blur correcting means, the details of which are shown in Japanese Patent Application Laid-Open No. 1-116619. In this known example, a photographing system is constituted by a variable power optical system, and a part of lens groups of the variable power optical system is driven eccentrically to correct image blur caused by vibration or the like.

The variable magnification optical system shown in FIGS. 7 to 9 has a first lens group 31 having a positive refractive power and a second lens group 32 having a negative refractive power in order from the object side. This is a so-called two-unit zoom lens in which the magnification is changed and the first lens group 31 is moved on the optical axis to perform focusing.
Reference numeral 33 denotes an imaging surface such as an imaging surface or a film, reference numeral 35 denotes a light beam that forms an image at a point A on the imaging surface 33, and reference numeral 34 denotes an optical axis of the variable power optical system. Also, in the figure, (A) shows the optical arrangement at the wide-angle end, and (B) shows the optical arrangement at the telephoto end.

FIG. 7 is a schematic diagram of the optical system when the camera has no vibration and there is no image blurring. In the figure, since the light beam 35 has no vibration and no image blur, the wide-angle end of FIG.
At the telephoto end in the figure, an image is formed at a point A on the image plane 33.

FIG. 8 is a schematic diagram of an optical system when a camera vibration is transmitted to a variable power optical system and an image is blurred. In the figure, for simplicity, the entire zooming optical system is tilted forward around the point A on the wide-angle side and the telephoto side, and the image forming state due to blurring of the light beam when image blurring is shown. That is, the light beam 35 that should be focused on the point A is focused on the point B on the focusing plane 33 on the wide-angle side as shown in FIG.
On the telephoto side, as shown in FIG.
Are imaged. Now, even during film exposure, if the variable-magnification optical system tilts monotonously from the state shown in FIG. 8A to the state shown in FIG. An image to be formed as a point image on A is formed as a blurred line image of line segment AB at the wide angle and line segment AC at the telephoto side.

FIG. 9 is a schematic diagram when the image blur of FIG. 8 is corrected. In the figure, the first lens group 31 is a movable lens group for image blur correction, and is decentered parallel to the optical axis 34 in a direction perpendicular to the optical axis 34 to correct image blur. In the figure, reference numeral 34a denotes an optical axis of the first lens group, and an optical axis 3 of the first lens group and the second lens group, which are coaxial before blur correction.
4 is parallel.

As shown in FIGS. 9A and 9B, the first lens group 31 is decentered in parallel by a predetermined amount with respect to the image blur caused by the forward tilt of the entire variable power optical system. As shown in FIGS. 8A and 8B, a light beam which forms an image at a point B at the wide-angle end and at a point C at the telephoto end can be formed at the point A which is an original image forming point. it can.

As described above, the image is stabilized by decentering the first lens group in parallel.

In FIGS. 7 to 9, image blur can be similarly corrected by decentering the second lens group in parallel instead of the first lens group.

[0011] In general the camera is hand-shake quantity y _I when tilted by an angle θ due to vibration or the like the focal length of the imaging system f, imaging magnification at that time (lateral magnification) and β, y _I = f · θ (1 + β) (1) Now, assuming that the amount of parallel eccentricity of the lens group for correcting the image blur amount is y _L , the sensitivity S as the image stabilizing means is S = y _I / y _L (2).

As is apparent from the equations (1) and (2), the sensitivity S of the image stabilizing means depends on the focal length f of the photographing system and the imaging magnification β, ie, the focus distance.

In the variable power optical system shown in FIGS. 7 to 9, since the first lens group 31 moves on the optical axis during focusing, the focal length of the variable power optical system as a whole is It changes variously depending on the focus distance. This applies not only to the two-unit zoom lens shown in the figure, but also to other types of zoom optical systems.

Particularly, recently, a so-called rear focus system has been adopted as a focus system in order to reduce the size of the variable power optical system. However, when this rear focus system is employed, the focal point of the entire system greatly changes depending on the focus distance. Come.

A camera having a conventional image blur correcting means includes:
An image blur correction unit having a vibration detecting unit and a vibration isolating unit is provided in a part of the photographing system, and the amount of vibration when the photographing system vibrates is detected by the vibration detecting unit. Image blur correcting means for correcting the image blur of the image by the photographing system. Then, the imaging apparatus detects the focus distance information and the focal distance information (zoom information) in real time, and corrects the image blur.

[0016]

However, in the above-mentioned prior art, it is difficult to follow the image blur at high speed and with high accuracy when the image blur sensitivity changes greatly. There is a problem. For example, when zoom is stopped
When the sensitivity greatly changes, the finder image looks discontinuous, or the response of the image stabilization occurs, and it is difficult to obtain smooth image stabilization characteristics.

An object of the present invention is to provide an optical hand for focusing.
When the stage is driven, it corresponds to the driving state of the optical means.
Quickly set the camera to the state in which
It is intended to provide an image blur correction device that can
You.

[0018]

[0019]

To achieve the above object, the present invention provides a vibration detecting means, an image blur correcting means,
The image blur correcting means based on the detection signal of the vibration detecting means.
Image blur correction drive means for driving the step, variable magnification
Zoom optical means, and the zoom
Drive means for driving the zoom optical system to perform zooming
An image blur correction device comprising:
Vibration sensitivity of the shake correction means corresponding to the camera position
Setting means for setting the detection signal of the vibration detecting means and the
The image blur compensation based on the image stabilization sensitivity of the setting means.
After driving the image blur correction means by the positive drive means,
The zoom optical means by the zoom drive means
Drive control means for driving to the predicted zoom position.
The image blur correction device is characterized in that:

[0020]

[0021]

According to the above-mentioned means, it is calculated by the focus detection calculation for operating the automatic focusing device, and based on the calculation amount (defocus amount, lens movement amount), prior to the automatic focusing operation of the lens. The image stabilization sensitivity is corrected at the zoom position to be moved, and the image stabilization operation is performed. As a result, the image blur can be corrected at high speed and with high accuracy by shortening the time required for the image stabilization operation and preventing discontinuity of the finder.

Further, when the zoom position is moved by the automatic zoom or the like and the zoom position is determined, the sensitivity is corrected at the zoom position to be moved prior to the operation of the zoom movement, and prevention is performed based on this. A swing operation is performed. Therefore, image blur can be corrected at high speed and with high accuracy.

[0023]

FIG. 1 is a block diagram showing an embodiment of a camera according to the present invention.

In FIG. 1, reference numeral 1 denotes a camera control device, for example, a CPU (Central Processing Unit), RAM, ROM, EEP
A one-chip microcomputer (hereinafter referred to as a microcomputer) in which a ROM (Electrically Erasable Programmable ROM) input / output port, an analog input port with an A / D conversion function, and the like are arranged. (Auto Focus), AE (Auto Exposure), Anti-Vibration and Control Software, AF, AE,
The parameters necessary for the vibration control are stored.

Reference numeral 2 denotes an external A / D converter which converts an analog signal from the multiplexer 8 into a digital signal and inputs the digital signal to the microcomputer 1 via the SAD. However,
An A / D converter inside the microcomputer 1 may be used. Reference numeral 3 denotes a D / A converter, which converts a digital signal (SDA) output from the microcomputer 1 into an analog signal. However, a D / A converter inside the microcomputer 1 may be used. A driver (amplifier) 4 amplifies an analog signal from the D / A converter 3. Reference numeral 5 denotes a vibration detecting means (hereinafter also referred to as a "camera shake sensor"), which is provided in a part of the photographing system, and detects vibration (angle) when the photographing system vibrates due to camera shake or the like.

Reference numeral 6 denotes a zoom position sensor, which outputs an analog signal as focal length information corresponding to the zoom position (focal length) of the variable power optical system when the photographing system includes a variable power optical system. . Reference numeral 7 denotes a focus position sensor, which detects a position on the optical axis of a focus lens of a photographing system and outputs an analog signal as focus distance information.

A lens position sensor 103 detects the position of the image blur correction lens group 105 and outputs an analog signal (analog voltage). 8 is a multiplexer,
One analog signal from each analog signal from the lens position sensor 103, the vibration detection means 5, the zoom position sensor 6, the focus position sensor 7, and the like is selected and output.
Reference numeral 9 denotes an I / O unit, which outputs a signal for controlling which analog signal is selected in the multiplexer 8 based on an output signal from the microcomputer 1, and checks the state of another system. Reference numeral 10 denotes a shutter control circuit that receives data input via the data bus DBUS while the control signal CSHT is being input from the microcomputer 1, and controls the movement of a shutter (not shown) based on this data.

Reference numeral 11 denotes an aperture control circuit which receives data input via the data bus DBUS while the control signal CAPR is being input from the microcomputer 1, and controls an aperture mechanism (not shown) based on this data. A display circuit 12 receives data input via the data bus DBUS while the control signal CDSP is being input from the microcomputer 1, and displays various photographing information based on the data. Reference numeral 13 denotes a switch group arranged outside and inside the camera, such as a release switch (not shown), a switch for setting various information such as a shutter and an aperture, and the like.

Reference numeral 14 denotes a lens control circuit which is connected to the data bus DB only while the control signal CLCOM is being input from the microcomputer 1.
Data input via the US is received, and lens driving data indicating the amount of movement of the photographing lens 100 in the optical axis direction based on this data, and lenses for counting the amount of defocusing of the photographing lens 100 versus the amount of movement of the lens Information and the like are input. BSY to the microcomputer 1 is a signal for notifying that the lens is moving. When this signal is "H" (high level), it is moving. The motor 15 is driven by these data to move the taking lens in the optical axis direction.

Reference numeral 16 denotes a photometric circuit, and an analog photometric signal SSPC output from the photometric circuit is sent to an analog input port having an A / D conversion function of the microcomputer 1 and is A / D-converted to the shutter control circuit 10 and the aperture control circuit 11. Used as photometric data for control. Reference numeral 17 denotes two sensor arrays SA according to the signals STR and CK input from the microcomputer 1.
A, a sensor driving circuit for controlling a line sensor 18 such as a CCD having SAB.

Reference numeral 100 denotes a photographing lens group, 101 and 102 denote photographing lenses, and 105 denotes an image blur correction lens, which comprises a lens constituting a part of a photographing system. Correction (vibration proof) is performed.

An actuator 104 eccentrically drives the image blur correction lens group 105 in accordance with an output signal from the driver 4. The image blur correction lens group 105, the actuator 104, and the like constitute one element of the image stabilizing unit.
Reference numeral 106 denotes an imaging surface of an imaging system, which corresponds to a position where an imaging element such as a film surface or a CCD is located. Note that the imaging surface 106 is fixed to the same lens barrel as the imaging system, and when vibration such as camera shake is applied to the imaging system, the image on the imaging surface 106 becomes a blurred image unless corrected by image blur correction means. Come.

Next, the operation of the above embodiment will be described with reference to the flowchart of FIG.

The operations of the shutter control circuit 10, the aperture control circuit 11, the display circuit 12, and the photometric circuit 16 are not directly related to the present invention, and will not be described in detail here.

When a power switch (not shown) is turned on (step 201), power supply to the microcomputer 1 is started, and the microcomputer 1 starts executing a sequence program stored in the ROM. When the microcomputer 1 starts executing a program, the microcomputer 1 is turned on by pressing a release button (not shown) in a first stage. The state of the switch SW1 is detected (step 202), and when the switch SW1 is off, all control flags and variables set in the RAM in the microcomputer 1 are cleared and initialized (step 203). Steps 202 and 203 are repeatedly executed until SW1 is turned on or the power switch is turned off. When SW1 is turned on, an operation for image stabilization is started (step 204).

Next, the anti-shake operation will be described with reference to FIG.

Vibration such as camera shake applied to the photographing system is detected by a camera shake sensor 5 (vibration detecting means), and a signal representing the magnitude and direction of displacement due to the vibration is output. Although various methods have recently been developed for the camera shake sensor 5, those that detect angular displacement of vibration, those that detect angular velocity, those that detect angular acceleration, and the like are applicable. By the way, this camera shake sensor outputs angular displacement, and if the sensor 5 detects angular velocity, it needs first-order integration, and if it detects angular acceleration, it needs second-order integration. The camera shake sensor 5 also includes each integral element depending on its detection system. When the analog output signal of the camera shake sensor 5 is selected by the multiplexer 8 by a control signal via the I / O unit 9 according to a command of the microcomputer 1,
The signal is sent to the A / D converter 2 and is taken into the microcomputer 1 as a digital signal of vibration due to camera shake or the like. The zoom position sensor 6 outputs an analog signal of the zoom position at which the image is to be captured in the image capturing system, that is, the focal length information.

The same applies to the analog signal of the focus distance information from the focus position sensor 7. The analog signal output from the lens position sensor 103 is a signal representing the position of the image blur correction lens group 105, and the analog signal
Incorporated in. The microcomputer 1 performs an arithmetic process on how to move the image blur correction lens group 105 with respect to the image blur based on the above four signals. The correction amount calculated by the microcomputer 1 is output to the D / A converter 3 as a digital signal. The D / A converter 3 converts a digital signal output from the microcomputer 1 into an analog signal, and adds a correction amount to the driver 4. The output signal of the driver 4 eccentrically moves the image blur correction lens group 105 to correct the image blurred on the imaging surface 106 based on the signal detected by the camera shake sensor 5 by the actuator 104.

In the present embodiment, the eccentric movement direction of the image blur correction lens group 105 and the detection direction of the camera shake sensor 5 are described with respect to only one axis of the eccentric movement direction and the detection direction of the camera shake sensor 5. Correction lens group 105
Moves in a plane perpendicular to the optical axis of the photographing system, and corrects image blur in two axes. Each component shown in FIG. 1 is provided for two axes. However, it goes without saying that the zoom position sensor 6, the focus position sensor 7, and the like are common, and the microcomputer 1 may be common if two axes are processed by time sharing or the like.

Conventionally, the focus position is read in real time, and the anti-shake sensitivity for correcting image blur is calculated based on this information. Therefore, the correction calculation is performed after the focus position is moved. In this embodiment, when the calculated value (for example, the defocus amount) during the focus detection calculation is known, the image stabilization is corrected prior to driving the lens.

Next, the photometric operation of step 205 is executed.

A photometric circuit 1 is provided to the microcomputer 1 for exposure control.
The output SSPC No. 6 is input to an analog input terminal, A / D converted, and optimal shutter control values and aperture control values are calculated from the digital photometric values, and each is stored at a predetermined address in the RAM. At the time of a release operation (when SW2 is ON), the shutter and the aperture are controlled by the shutter control circuit 10 and the aperture control circuit 11 based on these values.

Next, the image signal input processing of step 206 will be described with reference to the optical system explanatory diagram of FIG. 3 and the image signal characteristic diagram of FIG.

The image signal output from the focus detection sensor 18 is input to the microcomputer 1. The line sensor 18 is driven via the sensor drive circuit 17, and the image signal A of two images
(I) and B (i) are obtained. The operation of the sensor drive circuit 17 and the line sensor 18 at this time will be briefly described with reference to FIG. An accumulation start signal ST of “H” from the microcomputer 1
When R is output, the clear signal C from the sensor drive circuit 17 is output.
L is output to the line sensor 18 and the sensor rows SAA, S
The charge of each photoelectric conversion unit of AB is cleared. Then, the line sensor 18 is formed on the sensor rows SAA and SAB by a secondary imaging lens or the like (not shown in FIG. 1 but arranged in a state as shown in FIG. 3) arranged at the preceding stage. The photoelectric conversion of the light image and the charge storage operation are started.
When a predetermined time has elapsed since the above operation was started,
The transfer signal SH is sent from the sensor driving circuit 17 to the line sensor 1.
8, and the electric charges stored in the photoelectric conversion unit are transferred to the CCD unit. At the same time, an "H" accumulation end signal IEND is generated in the sensor drive circuit 17, and this signal is input to the microcomputer 1. Thereafter, when the microcomputer 1 outputs the CCD drive clock CK, the sensor drive circuit 17 outputs the CCD drive signals φ ₁ and φ ₂ . Accordingly, the analog image signal S is output from the line sensor 18 in accordance with this signal.
SNS is output to the microcomputer 1, and in response to this, the microcomputer 1 A / D converts the analog image signal SSNS in synchronization with the CCD drive clock CK, and outputs two image signals A (i) and B (B).
(I) is stored at a predetermined address in the RAM. Here, it is assumed that the number of pixels in the sensor rows SAA and SAB is 40.

Next, the focus detection calculation processing in step 207 will be described. First, an image shift amount PR, a defocus amount DEF, and the like of the photographing lens are calculated based on the input image signal.

First, the principle of focus detection in this type of apparatus will be described with reference to FIGS. A field lens FLD is arranged with the same optical axis as the photographing lens FLNS whose focus is to be detected. The two secondary imaging lenses FCLA and FC are located at target positions on the rear side with respect to the optical axis.
LB is arranged. Further behind the sensor arrays SAA, S
AB is arranged. Secondary imaging lens FCLA, FCLB
Are provided with apertures DIA and DIB in the vicinity of. The field lens FLD forms an image of the exit pupil of the photographing lens FLNS substantially on the pupil planes of the two secondary imaging lenses FCLA and FCLB. As a result, the ray bundles respectively incident on the secondary imaging lenses FCLA and FCLB are non-overlapping equal-area regions corresponding to the respective secondary imaging lenses FCLA and FCLB on the exit pupil plane of the photographing lens FLNS. It is the one that was ejected from. The aerial image formed near the field lens FLD is a secondary imaging lens FCLA, FCL.
B, the image is re-imaged on the surfaces of the sensor arrays SAA and SAB, based on the displacement of the aerial image position in the optical axis direction, the sensor array S
The two images on AA and SAB change their positions.
Therefore, by detecting the displacement (deviation) of the relative positions of the two images, the focus state of the photographing lens FLNS can be known.

As a signal processing method for detecting an image shift amount from an image signal output from the sensor arrays SAA and SAB, Japanese Patent Application Laid-Open Nos. 58-142306 and 59-1
No. 07313, JP-A-60-101513,
JP-A-63-18314 is disclosed by the present applicant. Specifically, the sensor array SAA or SAB
Is N, the i-th pixel (i = 0,...,
N-1) the image signals from the sensor arrays SAA and SAB
(I) and B (i)

[0048]

(Equation 1) Or

[0049]

(Equation 2) Is calculated for k ₁ ≦ k ≦ k ₂ . Note that M is the number of calculation pixels represented by (M = N− | k | −1).
K is called a relative displacement, and k ₁ and k ₂ are usually −N /
2, N / 2. Where max @ a,
The operator b｝ indicates that the larger one of a and b is extracted, and the operator min {a, b} indicates that the smaller one of a and b is extracted. Therefore, (1),
Terms X ₁ (k), X ₂ (k), Y in equation (2)
₁ (k) and Y ₂ (k) can be considered as correlation amounts in a broad sense. Further, looking at the expressions (1) and (2) in detail, X ₁
(K) and Y ₁ (k) are actually the correlation amounts according to the above definitions in the (k−1) displacement, X ₂ (k) and Y ₂ (k)
Represents the correlation amount at the displacement of (k + 1). Therefore, the evaluation amount X (k), which is the difference between X ₁ (k) and X ₂ (k), is equivalent to the image signals A (i) and B at the relative displacement amount k.
(I) means the amount of change in the correlation amount.

As is clear from the above definition, the correlation amounts X ₁ (k) and X ₂ (k) become minimum when the correlation between the two images is the highest. Therefore, the change amount X (k) should be “0” when the correlation is the highest, and the slope should be negative. However, since X (k) is discrete data,

[0051]

(Equation 3) Further, considering that there is a peak of the correlation amount in the section [kp, kp + 1] of the relative displacement in which X (kp) -X (kp + 1) is maximized,

[0052]

(Equation 4) By performing the interpolation calculation, the image shift amount PR of a pixel unit or less can be detected.

On the other hand, the correlation amounts of Y ₁ (k) and Y ₂ (k) are given by X ₁ (k),
The maximum value is opposite to X ₂ (k). Therefore, the change amount Y (k) should be “0” when the correlation is the highest, and the slope should be positive. Y (k) is the same as X (k)

[0054]

(Equation 5) And Y (kp) -Y (kp + 1) is the maximum

[0055]

(Equation 6) By performing the interpolation calculation, the image shift amount PR of a pixel unit or less can be detected. X (k), Y
The image shift amount can be detected by using any of the focus evaluation amounts of (k). However, as can be seen from JP-A-60-101513, | X (kp) -X (kp + 1) |> | Y
When (kp + 1) −Y (kp) |, the focus evaluation amount X
(K) by | X (kp) −X (kp + 1) |> | Y (k
In the case of (p + 1) −Y (kp) |, it is more accurate in terms of S / N to obtain the image shift amount PR using the focus evaluation amount Y (k).

The microcomputer 1 calculates the coefficient S of the defocus-to-lens movement amount, and calculates the defocus amount DEF of the photographing lens from the image shift amount PR by the following equation: DEF = K · PR. (K is preset by a value set by the focus detection optical system.) Subsequently, the movement amount FP of the photographing lens is calculated by FP = DEF / S from the defocus amount DEF and the coefficient S.

At this time, since the movement amount of the lens is calculated, the correction of the image stabilization sensitivity or the like can be performed before the operation of the lens.

Next, the correction processing in step 208 will be described. Based on the correction result, the microcomputer 1 performs the correction amount of the image blur correction lens group 105 for correcting the image blur.

FIG. 5 is a block diagram for explaining feedback control performed by the microcomputer 1 of FIG. 1 and control of so-called image stabilization sensitivity for changing a correction amount at the time of image blur correction of the image blur correction lens group 105. In this figure, the same elements as those in FIG. 1 are denoted by the same reference numerals, and the multiplexer 8, the A / D converter 2, the D / A converter 3, the I / O unit 9 and the like are omitted. In FIG. 5, reference numeral 20 denotes a part of an arithmetic processing portion performed in the microcomputer 1 of FIG.

An amplifier 21 amplifies the signal from the vibration detecting means 5. A controller 22 keeps feedback control stable. 23 denotes an image blur correction lens group 105 and an actuator 1 in FIG.
04 and the like. Reference numeral 24 denotes a memory, which changes the amplification factor of the amplifier 21. Reference numeral 25 denotes a calculation unit. 27 is an AF calculation unit. Reference numeral 26 denotes a differential, which performs a differential operation between the output signal of the amplifier 21 and the output signal of the lens position sensor 103.

In FIG. 5, the angular displacement signal such as camera shake from the camera shake sensor 5 is weighted by the amplifier 21.
This is a target value of the feedback loop control system in this embodiment. In addition, the anti-vibration means 23 which moves eccentrically to correct image blur is detected by the lens position sensor 103 using the amount of eccentric movement as a control amount. The differential unit 26 outputs a difference between the target value and the control amount, and sets the difference as a control deviation. The control deviation is subjected to control such as phase compensation by the controller 22 and is applied to the vibration isolator 23 as an operation amount.

That is, the image blur correction lens group 105 performs an eccentric movement sufficiently within a used band with respect to a target signal due to vibration such as camera shake, and an operation is performed so that the control deviation becomes zero. Is controlled to be stable.

Next, the signal of the focal length information from the zoom position sensor 6 and the signal of the focus distance information from the focus position sensor 7 are incorporated in the microcomputer 1 as described with reference to FIG. Defocus amount DEF, lens movement amount FP by AF calculation unit 27
The focus position information obtained from the value of is input to the calculation unit 25, and the calculation unit 25 in FIG. 5 calculates the image stabilization sensitivity for correcting image blur according to each information. The calculation method of the image stabilization sensitivity performed by the arithmetic unit 25 and the position sensor 6
The weighting of the signal from the focus position sensor 7 and the like are peculiar to each photographing system and are determined each time. The image stabilization sensitivity calculated by the calculation unit 25 is temporarily stored in the memory 24. The amplification factor of the amplifier 21 changes according to the image stabilization sensitivity stored in the memory 24 and weights the angular displacement signal from the camera shake sensor 5. Even when the image stabilization sensitivity changes according to the focal length or the focus distance by the target value signal weighted by the image stabilization sensitivity, the operation amount simultaneously changes, and the eccentric amount of the image blur correction lens group 105, for example, the parallel eccentric amount Changes.

For calculating the image stabilization sensitivity, the zoom position may be divided into finite portions and the focus position may be divided into finite portions, and the corresponding image stabilization sensitivities may be recorded in the ROM of the microcomputer 1 as a matrix and taken out.

As described above, according to the present invention, a stable image can be obtained on the imaging surface by calculating the correction amount of the image stabilization prior to the operation of the lens.

Next, the lens movement amount FP in step 207 is input to the lens drive circuit 14. The lens drive circuit 14 drives the motor 15 based on the lens movement amount FP to drive the photographing lens group 100 (step 20).
9). When the photographing lens group 100 stops, the AF processing starting from input of the image signals A (i) and B (i) ends. Then, the process returns to step 202.

In addition to the normal focus detection operation in this embodiment, the lens drive amount is estimated by predicting a change in defocus when predictive autofocus is performed to accurately focus on a moving subject. At the time of calculation, a correction for image stabilization may be applied.

Further, in this embodiment, digital control using a microcomputer has been described, but it goes without saying that the same effect can be obtained in analog control.

FIG. 6 is a flowchart showing another processing example of the present invention. The processing shown here describes the image stabilization control in the automatic zoom in which the variable magnification optical system operates automatically. Note that the automatic zoom here should be moved in advance by the operation member of the camera, the switch SW1, or the like. The focal length (zoom) position is calculated by the microcomputer 1 and the variable power optical system moves.

First, when a power switch (not shown) is turned on (step 601), power supply to the microcomputer 1 is started, and the microcomputer 1 starts executing a sequence program stored in the ROM. If it is determined that the switch SW1 is turned off (step 602), the RA
All the control flags and variables set in M are cleared (step 603), and the process proceeds to step 602.
Move to.

On the other hand, if it is determined in step 602 that the switch SW1 is on, an operation for image stabilization is started (step 604). Next, the switch group 13 shown in FIG.
Microcomputer 1 so that the specified zoom amount is sent by
Is performed (step 605). Then, the image stabilization sensitivity corresponding to the predicted zoom position is set (step 606).

Next, the photographing lens group 100 is driven (step 607). When the zoom movement amount is input from the microcomputer 1 to the lens driving circuit 14, based on this information, a zoom lens motor (only the motor 15 is shown in FIG. 1, but it may be used as both a focus motor and a zoom motor, A motor may be provided for the motor) to move the motor to a predetermined position. When the processing in step 607 ends, the processing moves to step 602.

In each of the above embodiments, a variable apex angle prism can be used as one element of the image stabilizing means for correcting image blur.

[0074]

Since the present invention is constituted as described above, the following effects can be obtained.

[0075]

[0076] According to the image stabilizer according to claim 1,
Image blur can be corrected with high speed and high accuracy.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a camera according to the present invention.

FIG. 2 is a flowchart showing an operation in the embodiment of the present invention.

FIG. 3 is a configuration diagram of an optical system illustrating an autofocus operation.

FIG. 4 is an image signal characteristic diagram illustrating an autofocus operation.

FIG. 5 is a block diagram showing a control system of image stabilization sensitivity for changing a correction amount at the time of image blur correction.

FIG. 6 is a flowchart illustrating another processing example of the present invention.

FIG. 7 is a schematic diagram of an optical system when the camera has no vibration.

FIG. 8 is a schematic diagram of an optical system when an image is blurred due to transmission of camera vibration to a variable power optical system.

FIG. 9 is a schematic diagram of an optical system showing an example in which correction has been performed on the optical system of FIG. 8;

[Explanation of symbols]

 Reference Signs List 1 microcomputer 2 A / D converter 3 D / A converter 4 driver amplifier 5 vibration detection means (camera shake sensor) 6 zoom position sensor 7 focus position sensor 8 multiplexer 9 I / O unit 10 shutter control circuit 11 aperture control circuit 12 display Circuit 13 Switch group 14 Lens control circuit 15 Motor 16 Photometric circuit 17 Sensor drive circuit 18 Line sensor 100 Photographic lens group 101, 102 Photographic lens 103 Lens position sensor 104 Actuator 105 Image blur correction lens 106 Image capturing surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G03B 5/00 G02B 7/08 G02B 7/34 G02B 13/36

Claims (1)

(57) [Claims] A vibration detecting means, an image blur correcting means,
The image blur correction means based on the detection signal of the motion detection means.
Image blur correction driving means for driving, variable magnification
Zoom optical means, the zoom light at the predicted zoom position
Zoom driving means for driving the academic system to perform zooming
An image blur correction device having the predicted zoom position.
The image stabilization sensitivity of the shake correction means corresponding to the
Setting means for setting, the detection signal of the vibration detecting means and the setting
The image blur correction drive based on the image stabilization sensitivity of the
After driving the image blur correction means by the moving means,
Predicting the zoom optical means by the zoom driving means
Drive control means for driving to the set zoom position.
And an image blur correction device.