JP3038021B2 - Camera shake prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for photographing image information such as a camera, a video, etc.
The present invention relates to a camera shake preventing apparatus that corrects an image shake caused by vibration or the like.

[0002]

2. Description of the Related Art Conventionally, as a camera shake correction device in a photographing apparatus, for example, Japanese Patent Publication No. 1-53957,
Using an angular velocity sensor, information relating to the rotation of the photographing device due to hand shake (shake) of the photographer supporting the camera is detected, and based on the information, an optical system of the whole or a part of the lens barrel or imaging is performed. In some cases, the movement is moved to correct the blur. Further, there is a device that detects image blurring from an output from an imaging unit including a photoelectric conversion element and corrects image blurring by controlling the transfer timing of charges of image information in accordance with the image blurring.

[0003]

In the conventional image stabilization method, when the image pickup means is used, data is transmitted with changing the transfer timing of image information. Therefore, the effect of the image stabilization is not fed back to the image pickup means itself. Was something. Therefore, it is necessary to evaluate data at different points in time after the transfer of the detected image data in order to confirm whether or not the effect was really effective, which complicates the configuration of the camera shake prevention device. there were.

Further, an apparatus for detecting acceleration or angular velocity of vibration of an entire image pickup apparatus such as a camera drives an optical system or the like based on a detection output of a mechanical shake (mechanical shake) detection sensor. Shake is corrected. However, even with such correction, the effect of the correction cannot be confirmed.

Further, in a shake correcting apparatus based on mechanical shake detection, if the ratio of the weight of a driven body such as an optical system to the entire image pickup apparatus such as a camera is not sufficiently small, the image is shot by driving the shake correcting means. The whole device vibrates conversely.
As a result, harmful image blurring occurs, and appropriate blurring cannot be prevented.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is possible to perform a shake correction while confirming the effect without complicating the structure of the apparatus, and to perform a shake correction for the shake correction. It is an object of the present invention to provide a camera shake preventing apparatus capable of performing effective shake correction without considering a problem regarding the weight of a driving body.

[0007]

A solving means for That shake prevention device for a camera according to the present invention, as shown in FIG. 1, a mechanical shake detection means 1 detects the Re lube be generated in the camera and outputs a signal, It has a weight and is attached to the camera body.
The shake correcting means 3 is controlled based on the output of the shake correcting means 3 and the output of the mechanical shake detecting means 1, and the weight portion is moved upward.
Drive relative to the camera body, and
Camera shake correction control means for canceling camera shake occurring in the camera body
And 2 . The turtle of the present invention
The camera shake prevention device detects camera shake
A shake detection means for outputting a signal, and a weight part,
A shake correction drive unit attached to the camera body, and the shake
The shake correction drive unit is controlled based on the output of the detection unit.
The camera body by the reaction of the weight
Insert the weight in the camera body in the direction to cancel the
Control means for driving with respect to
I do.

[0008]

[Action] In the shake prevention device for a camera according to the present invention, Re lube be generated in the camera is detected by the mechanical shake detection unit 1. In addition, a shake correcting means 3 having a weight portion
Is attached to the camera body. Then, based on the output of the mechanical shake detecting means 1, the shake correcting means 3
Is controlled, and the weight is positioned relative to the camera body.
Is driven in the camera body by the recoil
The blur is canceled by the blur correction control means 2 . Ma
Further, the camera shake preventing apparatus of the present invention
The shake is detected by the shake detection means and a signal is output.
It is. Also, the shake correction driving means having a weight portion is
It is attached to the camera body. And the control means is
The shake correction drive unit is controlled based on the output of the shake detection unit.
The weight of the camera unit
Insert the weight into the camera book in the direction to cancel the
Drive against the body.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram schematically showing a camera shake preventing apparatus according to the present invention. In FIG. 1, a mechanical shake detecting unit 14 is attached to a photographing optical system 13 including a photographing lens 11 and an image pickup unit 12.
It detects mechanical blurring that occurs at 13. Further, the photographing optical system 13 and the mechanical shake detection unit 14 constitute a shake correction driven unit 15.

The information on the mechanical shake of the photographing optical system 13 detected by the mechanical shake detector 14 is sent to the mechanical shake controller 16. Further, the shake signal is subjected to signal processing in a mechanical shake control unit 16 and becomes a shake correction drive unit 17 as a shake correction signal.
Sent to The shake correction drive unit 17 drives the shake correction driven unit 15 based on the shake correction signal to perform shake correction. Note that, in principle, the shake correction driven unit 15 may be assigned to a portion that is guaranteed not to cause camera shake unless mechanical vibration occurs.

Here, the mechanical shake detecting section 14 will be described.

Under general photographing conditions, image blur due to mechanical camera shake is predominantly caused by rotation of the camera, and therefore, it is sufficient to detect rotational motion blur. Therefore, mechanical shake detection unit 14, as indicated by reference number 14 ₁ in FIG. 3, the x-axis angular velocity detection unit 18 for detecting the angular velocity of the rotational motion of the x-axis, an angular velocity of the rotational motion of the y-axis And a y-axis angular velocity detecting section 19 for detecting.

In the case of a photographing condition with a high photographing magnification,
In some cases, not only the image blur due to the rotational motion but also the image blur effect due to the parallel translation of the camera cannot be ignored. In such a case, it may constitute a mechanical shake detection unit indicated by reference numeral 14 ₂ in FIG. The mechanical shake detection unit 142 includes _two acceleration sensors for each axis, like the x-axis acceleration detection units 20 and 21 and the y-axis acceleration detection units 22 and 23, and further includes a y-axis rotation angular velocity detection unit 24, It has an x-axis parallel movement speed detection unit 25, an x-axis rotation angular speed detection unit 26, and a y-axis parallel movement speed detection unit 27, and detects angular acceleration from the difference between the above acceleration sensors, and detects the angular speed by integral calculation. Like that. Further, the acceleration of the parallel movement is detected from the common component of the outputs of the acceleration sensors, and the parallel movement speed is detected by an integral operation.

The arrangement of each sensor in such a case is shown in FIG.
This is shown schematically in FIGS. FIG. 5 is a perspective view, and FIG.
FIG. 7 is a side sectional view as seen from the plus side of the axis, and FIG. 7 is a side sectional view as seen from the plus side of the x axis.

Next, the blur correction drive unit 17 will be described.

The shake correction driving section 17 applies a driving force in a direction corresponding to the detection signal of the shake detection section to the shake correction driven section 15.
, A drive actuator is configured.

FIG. 8 shows a shake detecting section having the structure shown in FIG.
14 shows a configuration example of a shake correction drive unit corresponding to _1. In the figure, the shake correction driven unit 28 is a film
29, a finder optical system including a shutter 30, a main mirror 31, a sub mirror 32, a photographing lens 33, a pentaprism 34, an AF (autofocus) detection unit 35, and the like, and a mechanical shake detection unit 36 and the like. A camera body 37 is provided outside the shake correction driven unit 28, and a power supply (not shown), a circuit for mechanical shake control, AF signal processing, and the like are attached thereto. The shake correction drive unit is attached between the camera body 37 and the shake correction driven unit 28. in this case,
Shake correction drive unit 38 around the y-axis directly to camera body 37
And a shake correction drive section 39 around the x-axis.
The shake correction drive unit 39 around the x axis is mounted so as to rotate around the y axis, and the shake correction driven unit 28 is mounted on the shake correction drive unit 39 around the x axis. ing. Thus, the shake correction driven unit 28 can be rotationally driven with respect to the camera body 37 around the x-axis and the y-axis.

The mechanical shake controller 16 includes a mechanical shake detector.
A drive signal is issued to the shake correction drive unit 17 so that the signal of 14 becomes zero. This mechanical shake control unit 16
In the operation of (1), the signal detected in the dimension of speed is integrated once, and the sign having the same magnitude as the value is used to control the speed of the shake correction drive unit 17 using the opposite signal. ing.

As described above, by driving the shake correction driven unit 15 including the mechanical shake detection unit 14 based on the signal from the mechanical shake detection unit 14, the shake correction can be performed while confirming the effect of the shake correction. Will be able to

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

First, when power is turned on and a program is started, initialization is performed in step A1. Here, as various initial setting operations, the CPU
A reset operation such as hardware or software (not shown) and an initial setting operation for members arranged outside the CPU are performed.

Next, the anti-vibration control is stopped in step A2. In some cases, the drive has already stopped at the stage of proceeding to step A2, but here, the drive control data (Sx, Sy) used for the shake prevention control is cleared. In step A3, the input switches of the camera are read by executing the key input routine, and the setting mode and data of the camera are set in accordance with the operation states of the switches.

If a key input is made, step A4
Then, the display routine is executed. Here, a display using a display device such as an operation state of the camera and data is performed. Next, the routine proceeds to step A5, where a photometry routine is executed. In the photometry routine, exposure time information and aperture value information to be controlled for actual photographing are calculated and output, and their operations are well-known, so detailed description will be omitted.

When the photometry is completed, step A
In step 6, reading and determination of the first release switch are performed. Here, if the first release switch is in the off state, that is, if the first release switch has not been operated, step A2
Return to On the other hand, when the first release is on, that is, when the first release is being operated, the process proceeds to step A7, where image stabilization is started, and mechanical shake detection and shake correction control corresponding thereto are started.

Further, in the distance measurement routine in step A8, information on the focus shift of the subject in the optical axis direction is obtained. Here, if the focus shift is small enough to determine that focus has been achieved, a focus determination flag is set. On the other hand, when it is determined that the focus shift cannot be tolerated, the focus determination flag is cleared. The focus determination flag is also cleared when it is determined that the subject cannot be focused due to lack of brightness or contrast of the subject.

Next, in step A9, the focus determination and the operation are separated by the focus determination flag. Here, when the camera is not in focus (focus determination flag = 0),
The process branches to step A10, and if in-focus (focus determination flag = 1), the process proceeds to step A11. Step A9 above
If it is determined in step that the camera is not in focus and the process branches to step A10, an AF driving routine is executed in step A10. In this routine, based on the information of the focus shift obtained in the distance measurement routine in step A8,
The focus adjusting optical system of the photographing lens 33 is driven so as to focus on the subject. Then, the process returns to step A2.

If it is determined in step A9 that the subject is in focus, the flow advances to step A11 to read and determine the state of the first release switch again. Here, when the first release switch is in the off state, that is, when the first release switch is not operated, the process returns to step A2. If the first release switch is on, that is, if the operation is continuously performed, in the next step A12, the second release is prohibited in the blur detection routine or the like, and it is determined whether or not the second release prohibition flag is set. Is determined. If it is prohibited here, step A8
Return to

On the other hand, if the second release is permitted, the flow advances to step A13 to read and determine the state of the second release switch. If the second release switch is off, that is, if the second release switch has not been operated, the process returns to step A8. On the other hand, when the second release switch is operated, the operation is shifted to the second release operation.

In step A14, a moving object predicting drive routine is executed, and if necessary, the focus adjusting optical system is driven so as to correct the movement of the subject in the optical axis direction during the exposure operation.
The focus shift is corrected. Note that the moving body predictive driving here means the speed (Vz) of the subject (object) in the optical axis direction.
), The movement of the subject during the release time lag is predicted, and the focus adjustment optical system of the photographing lens 33 is driven so as to be in focus during exposure to the film surface. For this moving object prediction drive, a known method shall be used.
Since it is not the gist of the present invention, a detailed description thereof is omitted here. That is, in this step A14, the focus adjustment optical system is driven to correct the focus shift so as to correct the movement of the subject in the optical axis direction during the exposure operation as necessary.

Next, after the exposure is started in step A15, it is determined in step A16 whether the exposure is completed. Here, if the exposure has not been completed, this determination is repeated. If the exposure has been completed, the process proceeds to step A17. The end of the exposure is determined by the exposure time timer or the like.
A signal generated inside a PU (not shown) may be used, or a switch or the like for detecting the end of the exposure operation interlocked with the shutter device may be provided to detect the state of the switch. .

If it is determined in step A16 that the exposure has been completed, the flow advances to step A17 to execute an exposure mechanical reset routine. By executing the exposure mechanical reset, the shutter is charged, the drive until the aperture is opened, the main mirror 31 is raised, and one frame of the film is wound up for the next photographing. Thereafter, returning to step A2, the above-described operation is repeated.

After detecting the operation of the first release switch in step A6 and starting the image stabilization in step A7, the in-focus determination is made in step A9 and AF driving is performed, or the operation of the first release switch operation is terminated. Is detected in step A11, or until the exposure sequence ends and returns to step A2, the blur correction control is continued.

As a secondary advantage of the embodiment described above,
Since the camera shake is corrected at the time of distance measurement, stable image information of the subject can be obtained irrespective of the camera shake, thereby enabling more accurate focus detection.

Next, a second embodiment of the present invention will be described.

FIGS. 10 and 11 schematically show a camera to which the camera shake preventing apparatus of the present invention is applied. FIG. 10 is a side view seen from the plus side of the x-axis, and FIG. 5 is a top view as seen from the plus side of FIG.

In FIGS. 10 and 11, the weight portion is rotated about the x axis on the yz plane (in the direction of arrow F in the drawing).
A camera shake correction drive unit 40 having a camera body 28 and a camera shake correction drive unit 40 having a weight unit 41a that rotates about the y axis on the xz plane (in the direction of arrow G in the drawing) are mounted on the camera body 28. . Reference numeral 42 denotes a blur detection unit. The above two weights
40a and 41a are moved by moving the weights 40a and 41a.
By driving the camera body 28 in a reaction, the shake of the photographing device is removed by the reaction.

The most important feature of this embodiment is that the driven part for blur correction is not an optical system for blur correction but a weight placed in the photographing apparatus.

In this case, the fact that the effect of the blur correction by the operation of the blur correction means by the blur detection means, which is a feature of the present invention, can be used more effectively. This is because the effect of the blur correction is directly reflected on the blur detection output.

Of course, the shake detecting unit may be one based on image blur detection or one based on mechanical blur detection.

In this case, a more effective system can be constructed by using a well-known fuzzy theory, neural network, or the like for the signal processing in the blur correction controller.

Next, an describes the third embodiment of the present invention.

FIG. 12 is a block diagram schematically showing the configuration of a camera to which the camera shake preventing apparatus according to the present invention is applied. Referring to FIG. 1, the camera includes a photographing lens 111, a focus detection optical system 112, an area image sensor 113, an interface circuit 114, a CPU (central processing unit) 115, a ROM (read only memory) 116,
Lens ROM 117, lens drive circuit 118, lens drive motor 118a, slit 120, light emitting diode 121a, photodiode 121b, display device 122, anti-vibration device 124, and first release switch SW1, second release switch SW2, etc., which constitute a photo interrupter. It is composed of

The focus detection optical system 112 includes the photographing lens 1
Light flux (image information) from a subject not shown via 11
Is incident, and the focus is detected to form an image of the subject captured by the photographing lens 111. The area image sensor 113 photoelectrically converts an image of a formed subject into an electric signal (video signal), and is driven by the interface circuit 114. The interface circuit 114 converts an electric signal (analog signal) from the area image sensor 113 into a digital signal,
Output to U115.

The CPU 115 controls the operation of the entire camera. For example, the CPU 115 calculates the subject distance based on the output of the area image sensor 113, and moves the image on the photographing screen by moving the subject. Is calculated, the display of the in-focus, out-of-focus, and other states on the display device 122 is controlled, and the anti-vibration device 124 is controlled.

Further, the ROM 116 stores the in-focus amount (interval between two images) in a plurality of areas where focus detection is performed.
The lens ROM 117 is provided in the lens barrel and is used for focus detection and focus adjustment such as conversion coefficients for converting the F number of the lens and the amount of image shift into a defocus amount and a drive amount of the focus adjustment optical system. It stores various data necessary for the operation.

The lens driving circuit 118 moves the focus adjusting optical system of the photographing lens 111 by driving a lens driving motor 118a under the control of the CPU 115.

Normally, in the AF operation for detecting the subject distance and driving the photographing lens 111 based on the distance information, it is necessary to feed back the driving amount of the photographing lens 111 to the CPU 115. In this case, it is a general practice to substitute the amount of movement of the photographing lens 111 by the number of rotations of the drive motor 118a. For this reason, here, the slit 120 is determined by counting with a photo interrupter. That is, when the lens driving circuit 118 operates and the driving motor 118a is rotated, the slits 120 provided at equal intervals in the rotating member of the lens barrel are rotated. Then, this slit 120,
Light emitting diode 121a and photodiode arranged opposite to each other
When passing between 121b, the rotation speed becomes
Counted by 115. Thereafter, when the count number reaches a predetermined value, the control is performed so as to stop the rotation of the driving motor 118a. The first release switch SW1 and the second release switch SW2 are switches for the AF operation.

The image stabilizing device 124 is driven by a control signal of the CPU 115 in order to correct image blur due to camera shake or movement of a subject.
No. 257909 describes a device for correcting blurring during photographing exposure. Then, a blur correction drive signal for canceling the blur determined based on the above-described image movement speeds Vx and Vy is received from the CPU 115 to drive the correction device.

FIG. 13 is an optical arrangement diagram showing a detailed configuration of the focus detection optical system 112 of FIG. The focus detecting optical system 112, a half mirror 112 ₁ which is mounted to be movable in an arrow A ₁ direction, the prism 112 _2, a field lens 112 _3, the prism 112b tilted 112a and the optical axis aperture stop
It is composed of field image transmitting optical 112 ₄ made of such. Incidentally, 112 ₅ represents the film surface.

The half mirror 112 ₁ is provided with a photographic lens 1
The light beam from 11, AF operation and the moving speed Vx, the direction of the prism 112 ₂ in order to obtain the Vy, the direction of the film 112 ₅ for photographing, is for directing divided respectively. Also, field image transmission optics 112 ₄ splits the light beam guided into two by the pupil division, two images Ia on the area image sensor 113, so that image the Ib. Then, using these two images Ia and Ib, CP
The U 115 performs focus detection and moving speed detection.

The moving speeds Vx and Vy of the image from the video signal
And Vcx, Vcy in the mechanical shake detection means
Is obtained, for example, by using the above-mentioned Japanese Patent Application No. 2-25790.
No. 9, the description is omitted here.

Next, a description will be given of the shake correction control in the shake preventing apparatus thus configured.

FIG. 14 is a block diagram showing a signal flow.
The shake correction means includes a shake correction optical system 127, a shake correction drive unit,
131, a blur correction actuator 132. Also,
The shake correction control means includes a detection target value section 129 and a detection signal processing section 130.

In FIG. 10, when a blur a occurs at reference numeral 125, the image passes through the photographing lens 126 and becomes an image blur b. This image blur b passes through the blur correction optical system 127,
Image blur c occurs. This image blur c is detected by the blur detecting means 28, and the detection output is d. An output e of the detection target value unit 129 as a detection target value e of the blur detection means 128;
The blur detection output d is sent to the detection signal processing unit 130.
Here, after the signal processing is performed, the processed signal f is sent to the blur correction driving unit 131 and becomes the drive signal g. Then, the shake correction actuator 132 is driven by the drive signal g, and a shake correction drive value h is added to the shake correction optical system 127.

That is, the above-described image blur c is obtained by comparing the image blur b passing through the photographing lens 126 with the blur correction drive value h.
It is overlapped with. Here, since the purpose is to eliminate blur, the blur detection target value e is now set to zero. And Fb, Fc, Fd, Ff, Fg, F
When h is a function of the signal conversion performed in each block, b = Fb (a) (1) c = Fc (b, h) (2) d = Fd (c) (3) e = 0 (4) f = Ff (d, e) (5) g = Fg (f) (6) h = Fh (g) (7)

Assuming the dimension of the speed of blur, the above equations (2), (3) and (7) are as follows: c = Fc (b, h) = b + h (8) d = Fd (c) (9) H = Fh (g) = g = Fg (g) = f (10)
h = Ff (b + h, e) (11)

Since the input signal processing of the detection signal processing unit 130 considers the difference between d and e, if Ff (d, e) = Ffx (de) (12), then e = Since it was set to 0, the above equation (11)
h = Ffx (b + h)
... (13) In this signal processing system, the function {h = Ffx (b + h)} is set so that d = 0, and the blur is corrected by processing the detection signal.

Next, consider the function Ffx.

For example, if Ffx (x) = − x, the above equation (13) can be expressed as follows: h = − (b + h), h = −b / 2, and d = b +
h = b / 2 (14), and the blur that passes through the photographing lens 111 is reduced by only half. .

Now, if the relationship is established as shown in the following expression (A-1) in Table 1, where t is the time, the above expression (13) becomes as shown in the following expression (A-2) in Table 1. become. Here, considering the discrete time Δt, since b and h are functions of the time t, they can be expressed as in the following equation (A-3) in Table 1. Furthermore, the integral in the case of the discrete appropriate time Δt is
Since it is considered in series, the expression (A-3) in Table 1 below is expressed as the expression (A-4) in Table 1 below. Solving this equation gives: h (t) = − b (t−Δt) (15) Considering the amount of detected image blur, from the above equation (8), d = b + h, and therefore d (t) = b (t) −b (t -Δt)
... (16) Here, by making the discrete time Δt smaller and smaller, the drive signal of the shake correction means becomes a signal of the same magnitude as the signal of the shake added from the outside, and the shake detection signal c becomes zero. And blurring can be prevented.

The detection signal processing unit 130 monitors the blur detected by the blur detection means 128. If the detection signal does not become zero as expected when the image stabilization control is performed. , The state can be detected.

For example, the function Ffx shown above is replaced with the variable α
Is used to generate a drive signal for correcting the blur by changing the value of the variable α while observing the effect of the blur correction by setting the relationship as in the expression (A-5) in Table 1 described later. It may be.

Next, the operation of the entire camera will be described with reference to FIG.
This will be described with reference to the overall sequence flowchart of the CPU 115.

First, after the power is turned on and the program is started, an initialization program is executed in step B1 to perform various initial setting operations. this is,
For example, setting of the timer of the CPU 115, setting of the interrupt condition of the CPU 115, setting of the I / O port, setting of the stack pointer, etc. Operation of reading various data such as the operation status of various cameras from the non-volatile storage unit provided in
It performs operations such as initial setting, initial operation, state detection and the like of each electric circuit and mechanical mechanism controlled by U115.

Next, the anti-vibration control is stopped in step B2. In some cases, the drive control data (Sx, Sy) used for the shake prevention control is cleared at this stage in step B2. Then, by executing the key input routine in step B3,
Each input switch of the camera is read, and a setting mode and data setting of the camera according to each operation are performed according to an operation state of the switches. If the key input is executed, the process proceeds to step B4, where the display routine is executed, and the display of the operation state of the camera, the data, and the like using the display device is performed. Then, in step B5, a photometry routine is executed. Since the photometry routine is a known operation, a detailed description is omitted.

When the photometry is completed, step B
At 6, the reading and determination of the first release switch SW1 are performed. Here, if the first release switch SW1 is off, that is, if the first release switch SW1 is not operated, the process returns to step B2. On the other hand, when the first release SW1 is turned on, that is, when the first release SW1 is being operated, the process proceeds to step B7, and the distance measurement subroutine is executed. In this distance measurement routine, information on the focus shift of the subject in the optical axis direction is obtained. Here, if the focus shift is small enough to determine that focus has been achieved, a focus determination flag is set. On the other hand, when it is determined that the focus shift cannot be tolerated, the focus determination flag is cleared. The focus determination flag is also cleared when it is determined that the subject cannot be focused due to lack of brightness or contrast of the subject.

Next, in step B8, the focus determination and the operation are separated by the focus determination flag. Here, when the camera is not in focus (focus determination flag = 0),
The process branches to step B9, and if the subject is in focus (focus determination flag = 1), the process proceeds to step B10. Step B8 above
If it is determined in step B9 that the camera is not in focus and the process branches to step B9, a subroutine for AF driving is executed in step B9. In this subroutine, step B
The focusing optical system of the taking lens 111 is driven so as to focus on the subject, based on the information on the focus deviation obtained in the distance measurement routine of Step 7. Then, after this, step B2
Return to

If it is determined in step B8 that the image is in focus, the routine proceeds to step B10, where an image blur detection routine is executed. In the image blur detection routine, the image blur speed (Vx, Vy) based on the image information is detected.

When the image blur detection is completed, the process proceeds to step B11, and the subroutine of the blur correction control shown in FIG. 16 is executed. According to this, first, in step C1, the image blur speed (Vx, Vy) of the image calculated and detected in the image blur detection routine of step B10 described above is read. Next, in step C2, the read image blur velocity data is integrated, and Sx = Sx + αx · Vx Sy = Sy + αy · Vy (17) and drive control data (Sx,
Sy) is calculated. Here, (αx, αy) is a coefficient representing the influence of the shake correction by the shake correction means.

Next, in step C3, the above (Sx
), (Sy) are used to correct the blur,
The data (-Sx, -Sy) is sent to the blur correction drive unit for inverting the sign and driving the blur correction means with the signal (-Sx, -Sy).

Then, in step C4, the effect of the blur correction is evaluated and determined whether or not proper blur correction has been performed. If it is determined that the subroutine is appropriate, the process returns to exit from this subroutine. On the other hand, if it is determined that the image magnification is inappropriate, the image magnification may deviate from the design value. However, here, the influence of the blur correction is considered to be inappropriate. In such a case, the process proceeds to step C5, where the values of the coefficients (αx, αy) representing the influence of the blur correction are corrected and changed. Then, the process returns to escape from this subroutine.

When the determination in step C4 is made, a plurality of past image blur detection values may be used in order to allow time to spare. The effect determination and the correction of the coefficient α may be performed before the integral calculation of the image blurring speed.

When the blur correction control has been executed, the flow advances to step B12 to read and determine the state of the first release switch SW1. Here, when the first release switch SW1 is in the off state, that is, when the first release switch SW1 is not operated, the process returns to step B2. If the first release switch SW1 is on, that is, if the operation is being performed continuously, in the next step B13, the second release is prohibited in the blur detection routine or the like, and whether or not the second release prohibition flag is set. Is determined. If it is prohibited here, the process returns to step B10.

On the other hand, if the second release is permitted, the process proceeds to step B14, where the reading of the state of the second release switch SW2 is determined. If the second release switch SW2 is off, that is, if the second release switch SW2 is not operated, the process returns to step B10. On the other hand, if the second release switch SW2 has been operated, the flow shifts to the exposure sequence of the second release operation from step B15.

First, at step B15, a moving object predictive driving routine is executed, and if necessary, the focus adjusting optical system is driven so as to correct the movement of the subject during the exposure operation in the optical axis direction. Make corrections. Here, the moving object prediction drive means that the movement of the subject during the release time lag is predicted from the speed (Vz) of the subject (object) in the direction of the optical axis, and shooting is performed so as to be in focus at the time of exposure to the film surface. This is to drive the focusing optical system of the lens 111.
A known method is used for this moving object prediction driving, and is not the gist of the present invention, and therefore detailed description thereof is omitted here. That is, in step B15, the focus adjustment optical system 112 is driven to correct the focus shift so as to correct the movement of the subject in the optical axis direction during the exposure operation as necessary.

Next, after the exposure is started in step B16, it is determined in step B17 whether the exposure is completed. Here, the determination is repeated until the exposure is completed. The end of the exposure is determined by the exposure time timer or the like.
A signal generated inside the PU 115 may be used, or a switch or the like for detecting the end of the exposure operation interlocked with the shutter device may be provided, and the state of the switch may be detected.

If it is determined in step B17 that the exposure has been completed, the flow advances to step B18 to execute an exposure mechanical reset routine. By executing the exposure mechanism reset, the shutter is charged, the drive until the aperture is opened, the half mirror 112 is raised, and one frame of film is wound up for the next photographing. Thereafter, returning to step B2, the above-described operation is repeatedly performed.

As described above, in the third embodiment, as the optical system for correcting the blur, the one using the inclination of the optical system of the parallel plate glass separately from the x-axis and the y-axis is used. You do not need to be caught. For example, a parallel plate shared by the x-axis and the y-axis may be used, or an optical system having at least a part of the power of the photographing lens may be a tilt-correction optical system using eccentricity, In addition, an image taking advantage of eccentricity of the imaging surface itself with respect to the photographing lens may be used.
Further, the camera lens and the imaging unit may be integrally tilted or decentered to correct blur. These are based on the image of the subject that has passed through the taking lens, and the effect of the movement of the optical system for blur correction is fed back to the blur detection device, and thus does not depend on the optical system for blur correction. is there.

Further, in the case of a blur correction optical system in which the effect of moving an image due to the movement of the optical system for blur correction is changed by the zoom operation of the imaging lens, the zoom operation amount and the zoom optical system are changed. By detecting the position and using the value at the time of the shake correction control, the effect of the shake correction can be further enhanced. In addition, it becomes possible by changing the coefficients (αx, αy) representing the influence of the above-described shake correction depending on the magnification operation fee and the position of the magnification optical system.

[0081]

As described above, according to the present invention, it is possible to perform shake correction while confirming the effect without complicating the structure of the apparatus, and to reduce the weight of the driven body for shake correction. The present invention can provide a camera shake prevention apparatus capable of performing effective shake correction without taking into account the problem with respect to camera shake. Further, even if the apparatus itself applies vibration for blur correction, the amount itself is fed back to the blur detection output, so that blur can be reliably prevented.

[0082]

[Table 1]

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a camera shake preventing apparatus according to the present invention.

FIG. 2 is a block diagram schematically showing a camera shake preventing apparatus according to the present invention.

FIG. 3 is a block diagram illustrating an example of a mechanical shake detection unit illustrated in FIG. 2;

FIG. 4 is a block diagram illustrating another example of the mechanical shake detection unit in FIG. 2;

FIG. 5 is a perspective view schematically showing an arrangement of each acceleration detection unit in FIG. 4;

FIG. 6 is a side sectional view schematically showing the arrangement of each acceleration detection unit in FIG. 4, as viewed from the plus side of the y-axis.

7 is a side sectional view schematically showing the arrangement of each acceleration detecting unit in FIG. 4, as viewed from the plus side of the x-axis.

8 is a diagram illustrating a configuration example of a shake correction driving unit corresponding to the mechanical shake detection unit in FIG. 3;

FIG. 9 is a sequence flowchart illustrating an overall operation.

FIG. 10 is a side view of a camera to which a camera shake preventing apparatus according to a second embodiment of the present invention is applied, viewed from the plus side of the x-axis.

FIG. 11 is a top view of a camera to which a camera shake preventing apparatus according to a second embodiment of the present invention is applied, viewed from the plus side of the y-axis.

FIG. 12 is a block diagram schematically showing a configuration of a camera to which a camera shake preventing device is applied according to a third embodiment of the present invention.

FIG. 13 is an optical layout diagram showing a detailed configuration of a focus detection optical system in FIG. 12;

FIG. 14 is a block diagram showing a signal flow in the third embodiment.

FIG. 15 is a sequence flowchart illustrating an overall operation of the CPU in FIG. 12;

FIG. 16 is a subroutine for explaining the shake correction control in the flowchart of FIG. 1 ... mechanical shake detection unit, 2 ... shake correction control means, 3 ... shake correction means, 11 ... imaging lens, 12 ... imaging unit, 13 ... imaging optical system, 14, 14 _1, 14
₂ … Mechanical shake detection unit, 15… shake correction driven unit, 16… mechanical shake control unit, 17… shake correction drive unit, 18… x-axis rotation angular velocity detection unit, 19… y-axis rotation angular velocity detection unit, 20, 21 ... x-axis acceleration detector, 22, 23 ... y-axis acceleration detector, 24 ... y-axis angular velocity detector, 25 ... x-axis parallel movement velocity detector, 26 ... x-axis angular velocity detector, 27 ... y-axis parallel Moving speed detector.

Claims (2)

(57) [Claims] The method according to claim 1] signal by detecting the Re lube be generated in the camera
A camera shake correction means having a camera shake detection means for outputting, and a weight part, attached to the camera body.
Drive means and said shake the shake correction drive means based on the output of the detection means
And adjust the weight part relative to the camera body.
The camera body due to the recoil
And a cancel vibration control means, image stabilization device for a camera, characterized in that it comprises a. 2. A method for detecting a camera shake and generating a signal.
A camera shake correction means having a camera shake detection means for outputting, and a weight part, attached to the camera body.
A driving unit, and the shake correction driving unit based on an output of the shake detection unit.
To control the camera book
Insert the weight in the direction of the camera
And a control means for driving the camera body .