JPH07301835A - Camera provided with camera shake preventing function - Google Patents

Abstract

PURPOSE:To start correction and exposure when the shake of two axes tends to decrease in order to effectively utilize a shake correction range by restraining the delay of shake correction. CONSTITUTION:This camera is constituted of a camera shake sensor part 1 detecting a camera shake signal related to the shake of a photographic image plane caused by camera shake; a shake correction part 2 correcting the shake by moving an image on film; a shake speed decrease decision part 3 deciding based on output from the sensor part 1 whether shake speed tends to decrease; and a 1st shake correction start signal output part 4 outputting a signal for starting the shake correction by the correction part 2 in the case the output from the decision part 3 shows a decreasing direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera with an anti-shake function, and more particularly to a camera with an anti-shake function that detects the camera shake and corrects the movement of the image due to the camera shake to prevent the deterioration of the image quality.

[0002]

2. Description of the Related Art When a camera is used, the image quality may be deteriorated due to the vibration of the camera due to camera shake or the like. Then, in order to prevent the deterioration of the image quality, many methods and devices have been proposed for detecting the vibration of the camera and the movement of the subject image, and driving the optical means for correcting the movement of the subject image on the film in the direction of canceling the blur. There is.

However, when the actuator is driven, there is an electrical and / or mechanical follow-up delay, and this delay becomes a factor that deteriorates the accuracy of camera shake correction. In particular,
When the actuator is activated, the camera shake already has the speed of image movement, but the actuator operates from the stopped state, so that a delay is likely to occur remarkably and the camera shake correction accuracy is significantly deteriorated.

In view of this, in Japanese Patent Laid-Open No. 3-121436, in order to realize a highly accurate camera shake prevention by operating the camera shake correction without delay, the camera shake correction operation is started when the camera shake speed becomes zero. Examples are disclosed.

[0005]

However, in the above-mentioned Japanese Patent Laid-Open No. 3-121436, the driving of the actuator is started only when the blurring speed becomes zero, which is very effective in preventing camera shake. But
When considering the frequency of shake zero, there are few timings,
It is difficult to achieve effective blur correction at the photo opportunity.

Further, in the case of correcting the blur in the two directions of the screen by using the blur sensor having the sensitivity in each of the two directions of the plane of the photographing screen and the two actuators corresponding to the sensitivity directions of the sensors. Shake rate 0 by sensor
If the actuator is started independently at
The probability that the correction means is located at the center of the correction area of the correction optical means at the time when the shake of the axis is prevented decreases, and it becomes easy to reach the limit of the correction direction that started driving first, and the shake correction can be performed for a sufficiently long time. There are cases where you cannot do it all over.

Further, depending on the configuration of the correction optical means, there may be a difference in the image quality level between the central portion and the peripheral portion of the correction range, and if the correction is performed outside the center, the best image quality cannot be provided. There is also.

The present invention has been made in view of the above problems, and provides a camera with a blur prevention function capable of suppressing the delay in blur correction and starting blur correction and exposure from the vicinity of the center of the blur correction range. It is an object.

[0009]

SUMMARY OF THE INVENTION That is, the present invention detects the information related to the blurring of the photographing screen due to the handshake and outputs the handshake signal, and the camera shake sensor means for moving the object image on the film. Blurring correction means for correcting the influence, judgment means for judging whether the speed of camera shake tends to decrease on the basis of the camera shake signal, and when this judgment means determines that the speed of camera shake tends to decrease And a blur correction start signal output unit for starting the blur correction operation by the blur correction unit.

Further, according to the present invention, camera shake sensor means for detecting information on camera shake due to camera shake and outputting a camera shake signal, and camera shake correction for correcting the influence of the camera shake by moving the subject image on the film. Means for determining whether the absolute value of the speed of the camera shake is smaller than a predetermined value based on the camera shake signal, and the camera shake correction means when the determination means determines that the absolute value of the camera shake is small. And a blur correction start signal output means for starting the blur correction operation according to.

[0011]

In the camera with a shake prevention function of the present invention, the shake sensor means detects the information concerning the shake of the photographing screen due to the shake and outputs the shake signal. Then, the influence of the camera shake is corrected by moving the subject image on the film by the shake correcting means.
Further, based on the camera shake signal, the determining means determines whether the camera shake speed tends to decrease. When it is determined by the determination means that the speed of the camera shake is in a decreasing tendency, the camera shake correction start signal output means starts the camera shake correction operation by the camera shake correction means.

Further, in the camera with a shake preventing function of the present invention, the information on the shake of the photographing screen due to the shake is detected by the shake sensor means and the shake signal is output. Further, by moving the subject image on the film, the influence of the camera shake is corrected by the shake correction unit. Then, based on the camera shake signal, the determining means determines whether the absolute value of the camera shake speed is smaller than a predetermined value. When the determination means determines that the absolute value of the camera shake is small, the camera shake correction start signal output means starts the camera shake correction operation by the camera shake correction means.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the basic configuration of a camera with a shake prevention function of the present invention.

This camera with a camera shake prevention function includes a camera shake sensor section 1 for detecting a camera shake signal related to camera shake caused by camera shake, and a camera shake correction section 2 for correcting a camera shake by moving an image on a film. The shake speed decrease determination unit 3 that determines whether the speed of the shake is decreasing from the output of the shake sensor unit 1 and the shake by the shake correction unit 2 when the output of the shake reduction determination unit 3 indicates a decreasing direction. It is composed of a first blur correction start signal output unit 4 that outputs a correction start signal.

FIG. 2 is a block diagram showing a second basic configuration of the camera with a shake preventing function of the present invention. The camera having the second basic configuration includes a camera shake sensor unit 1 for detecting a camera shake signal related to a camera shake caused by a camera shake, a camera shake correction unit 2 for correcting a camera shake by moving an image on a film, and When the output of the camera shake sensor unit 1 determines whether the camera shake speed tends to decrease, and when the output of the camera shake speed decrease determination unit 3 indicates a decreasing direction after the exposure start preparation is completed. And a second blur correction start signal output unit 5 that outputs a signal for starting the blur correction by the blur correction unit 2. Further, the camera according to the second basic configuration includes an exposure start signal output unit 6 that outputs an exposure start signal after a lapse of a predetermined time from the output of the blur correction start signal, and an exposure device 7 that exposes a subject image on film. It has a configuration including and.

FIG. 3 is a block diagram showing a third basic structure of the camera with a shake preventing function of the present invention. The camera according to the third basic configuration includes a camera shake sensor unit 1 that detects a camera shake signal related to a camera shake caused by camera shake, a camera shake correction unit 2 that corrects camera shake by moving an image on a film, and It has a blur velocity absolute value determination unit 8 that determines from the output of the camera shake sensor unit 1 whether the absolute value of the blur velocity is smaller than a predetermined value. Further, this camera sends a signal for starting blur correction by the blur correction unit 2 when the output of the blur speed absolute value determination unit 8 indicates that the blur speed is smaller than a predetermined value after the preparation for starting exposure is completed. A third blur correction start signal output unit 9 for outputting, an exposure start signal output unit 6 for outputting an exposure start signal after a predetermined time has elapsed from the output of the blur correction start signal, and an exposure for exposing a subject image on a film. And a device 7.

FIG. 4 is a block diagram showing the fourth basic construction of the camera with the hand-shake preventing function of the present invention. Figure 4
As shown in FIG. 4, the camera having the fourth basic configuration corrects the blur by moving the image on the film and the blur sensor unit 1 that detects a blur signal related to the blur of the screen due to the blur. The shake correction unit 2, the shake speed reduction determination unit 3 that determines whether the speed of the shake is decreasing from the output of the shake sensor unit 1, and the absolute value of the speed of the shake from the output of the shake sensor unit 1 are predetermined. It has a blur velocity absolute value determination unit 8 for determining whether it is smaller than a value. And this camera, after the completion of the exposure start preparation,
In at least one of the case where the output of the blur velocity absolute value determination unit 8 indicates that the blur velocity is smaller than a predetermined value or the output of the blur reduction determination unit 3 indicates a decreasing direction, the blur correction unit A fourth blur correction start signal output unit 10 that outputs a blur correction start signal according to 2; and an exposure start signal output unit 6 that outputs an exposure start signal after the elapse of a predetermined time after the output of the blur correction start signal. And an exposure device 7 for exposing a subject image onto a film.

Further, as shown in FIG. 5, the camera shake sensor unit 1 shown in FIGS. 1 to 4 is provided with a first axial camera shake detecting unit 11 for detecting camera shake in the first axial direction of the screen, and It is also possible to use a bidirectional camera shake detection sensor unit 13 including a second axial camera shake detection unit 12 that detects camera shake in a second axis direction of the screen, which is a direction different from the one axis. With this configuration, it is possible to configure a camera shake sensor capable of detecting a two-dimensional shake on the plane of the screen.

Further, as shown in FIG. 6, the first,
In the second and fourth configurations, the two shake detection units (the first shake detection unit having the shake sensitivity directions in the two axial directions orthogonal to each other on the screen plane).
Axial camera shake detection unit 11 and second axial camera shake detection unit 1
In the case of the camera shake sensor unit 13 having 2), the shake speed decrease determination unit 3 further determines whether the shake speeds of the signals from the two shake detection units are decreasing at the same time. Axial blurring speed reduction determination unit 14, second axial blurring speed reduction determination unit 15, and AND operation unit that performs AND processing (logical AND operation) on the signals from the two blurring speed reduction determination units 14 and 15 It is also possible to replace it with the blurring speed reduction determination unit 3a composed of 16.

Further, as shown in FIG. 7, in the arrangements of FIGS. 3 and 4, two shake detecting portions (first shake detecting units) having shake sensitive directions in two axial directions orthogonal to each other on the screen plane are provided. When the camera-shake sensor unit 13 having the axial camera-shake detection unit 11 and the second axial camera-shake detection unit 12) is used, the camera-shake speed decrease determination unit 8 is further used as the camera-shake speed of the signals from the two camera-shake detection units. So that it can be determined at the same time whether the absolute value of is less than or equal to a predetermined value, the first axial direction blurring speed absolute value determining unit 17, the second axial direction blurring speed absolute value determining unit 18, and the two blurring speed absolute value determinations. It is also possible to use the shake velocity reduction determination unit 8a configured by the logical product calculation unit 16 that performs an AND process (logical product calculation) on the signals from the units 17 and 18.

Further, in order to simplify the structure, in the structures shown in FIGS. 1, 2 and 4, as shown in FIG. 8, the sensitivity direction of blurring in two axial directions orthogonal to the plane of the screen. When the camera shake sensor unit 13 has two camera shake detection units (first axial camera shake detection unit 11 and second axial camera shake detection unit 12) that have the A camera shake sensor output combiner 19 that combines the signals from the detectors and a combined camera shake speed decrease determiner 20 that determines whether the combined camera shake signal shows a decreasing tendency of the camera shake speed are included. 3b, the signals from the two blur detection units may be combined to determine whether or not the combined blur speed tends to decrease.

Further, in order to simplify the configuration in the configurations of FIGS. 3 and 4, as shown in FIG. 9, a blurring sensitivity direction is provided in two axial directions orthogonal to the plane of the screen. When the camera shake sensor unit 13 having the individual camera shake detection units (the first axial direction camera shake detection unit 11 and the second axial direction camera shake detection unit 12) is used, the camera shake sensor absolute value unit 8 and the camera shake sensor output combiner unit 19, The combined shake signal is composed of a combined camera shake speed absolute value determination unit 21 that determines whether the absolute value of the shake speed is less than or equal to a predetermined value, and is replaced with the shake speed absolute value unit 8b.
It is also possible to combine the signals from the two shake detection units and determine whether the combined shake speed is equal to or lower than a predetermined value.

Next, a specific configuration example of the present invention will be described. FIG. 10 shows three axes of x, y, and z given to the camera. FIG. 11 shows a specific configuration of an embodiment of the present invention, and is a diagram showing an example in which the camera with a shake preventing function is applied to a so-called single-lens reflex camera.

In FIG. 11, inside the camera body 22,
The taking lens 23, the parallel glass plate 24, the quick return mirror 25, the screen 26, the finder optical system 27, the shutter device 28, the film 29, and the electrical connection portion 30 including the flexible substrate 30 are used for the camera. An electronic circuit section 31 for electrically controlling the operation of is provided.

At the lower position (25a) of the quick return mirror 25, the subject image that has passed through the taking lens 23 is reflected upward by 90 degrees by the quick return mirror 25 and is formed on the screen 26. The photographer can observe the subject image through the finder optical system 27. And when shooting, quick return mirror 2
5 is moved to the position of 25b, and the subject image advances in the direction of the shutter device 28 as it is. At this time, the shutter device 2
The subject 8 is photographed by opening the shutter curtain of 8 and exposing the film 29.

The blur correction unit 2 is installed between the taking lens 23 and the quick return mirror 25.
As the blur correction driving unit for actually correcting and moving the image of the blur correction unit 2, a blur correction motor 32 that provides a driving force for blur correction, and a blur correction optical system (parallel A glass plate) 24 and a blur correction force transmission unit 33 for transmitting the output of the blur correction motor 32 to the blur correction optical system 24.

Further, between the rear side of the film surface inside the camera body 22 (negative side of the z-axis) and the rear surface of the camera,
Camera shake sensor unit 1 for measuring and detecting camera shake
Have been placed.

12 (a) and 12 (b) are diagrams showing a more detailed arrangement of the camera-shake sensor section 1. As shown in FIG. On the back surface of the camera body 22, a grip portion 34 protruding from the back surface of the camera is provided in order to improve the holding property of the camera. The camera shake sensor unit 1 is provided inside the grip unit 34.

The camera shake sensor unit 1 is a vibration speed sensor for detecting camera shake vibration as the speed of mechanical vibration. More specifically, the speed of rotational vibration as disclosed in Japanese Patent Laid-Open No. 2-51066. Of the vibration gyro 1a and 1b, which are so-called vibration type angular velocity sensors, and a vibration gyro processing circuit 1c for amplifying the output of the vibration gyro to a predetermined signal level.
(Composed of vibration gyro processing circuits for the vibration gyros 1a and 1b). The outputs of the vibrating gyros 1a and 1b processed by the vibrating gyro processing circuit 1c are connected to the electronic circuit section 31 via the electrical connection section 30. Further, the power supply to the camera shake sensor unit 1 is also performed via this electrical connection unit 30.

A parallel glass plate 24 is used as the optical axis shift optical system for shifting the optical axis in parallel with the optical axis in the blur correction optical system in the embodiment. Here, the operation of the parallel glass plate 24 will be briefly described.

In FIG. 11, when the parallel glass plate 24 is inclined by θ from the position perpendicular to the optical axis and reaches the position shown by the broken line in the figure, the light rays are directed to the front and rear surfaces of the parallel glass plate 24. Then, the light beams are refracted in the opposite directions by the same angle, and the optical axes are shifted in parallel. By utilizing this action, the image is moved in a direction in which it is canceled in accordance with the movement of the image due to camera shake, and the movement and deterioration of the image due to camera shake are corrected and prevented.

The blur correction motor 32 and the blur correction force transmission unit 33 are provided for blur correction motor and blur correction force transmission unit for correcting blur in the x-axis direction of the screen, and blur in the y-axis direction of the screen. It is composed of a shake correction motor for correction and a shake correction force transmission unit.

FIG. 13 is an overall perspective view of the tilting device for the parallel glass plate 24. In FIG. 13, the parallel glass plate 24 is attached to the gimbal frame 34, and the gimbal frame 34 is rotatably attached to the gimbal frame 36 by a gimbal shaft 35. This gimbal frame 3
6 is attached to the lens barrel 38 so as to be rotatable by a gimbal shaft 37. Thus, the parallel glass plate 24 is attached to the lens barrel 38 by the gimbal mechanism.

The rotations of the shake correction motors 32x and 32y are performed by rotating the gears 40x and 40y and the eccentric cams 41x and 4y, respectively.
1y, cam plate 39 and gimbal rollers 42x, 42y
And the image is transmitted to the shake correction optical system by the parallel glass plate 24 rotatably around the y axis and the x axis via the shake correction force transmission parts 33x and 33y configured by the gimbal mechanism described above. . The position of the subject image on the film can be changed by rotating the parallel glass plate 24. Of course, changes in the rotations of the motors 32x and 32y result in changes in the image moving speed for correction.

Here, the rotational vibration speed ωb of the camera detected by the vibration gyro and the tilting speed ωs of the parallel glass plate 24 for correction are the refractive index n of the parallel glass plate 24 and the parallel glass plate 24. When the thickness is D, the focal length of the taking lens 23 is f, and the taking magnification is B, ωs = {f · (1 + B) / (D · (1-1 / n)) −
1} · ωb or ωs = {f / (D · (1-1 / n)) − 1} · ωb is shown in Japanese Patent Application No. 6-25321 filed by the applicant of the present application. ing.

In the electronic circuit section 31 of FIG. 11, the parallel glass plate 24 is tilted to cancel the vibration of the image based on the vibration angular velocity information of the camera body 22 detected by the camera shake sensor section 1. An arithmetic processing unit such as a CPU for generating a drive signal for the blur correction motor 32 is installed.

FIG. 14 shows the configuration of an electrical signal processing block for preventing image movement due to camera shake. The camera shake sensor unit 13 is the first camera shake detection unit 1 in the axial direction.
1 and a second axial camera shake detection unit 12. The angular velocity signal of the vibration due to the camera shake output from the first and second axial camera shake detection units 11 and 12 is sent to the CPU 43 of the electric circuit unit 31.

The angular velocity signals for the above two axes are CP
The angular velocity signal is digitized by the first A / D converter 44x and the second A / D converter 44y in the U43 in order to digitally process the signal. The angular velocity signal digitized by the first A / D converter 44x is x
It is proportional to the speed of axial shake. Also, the second A / D
The angular velocity signal digitized by the converter 44y is proportional to the blurring velocity of the screen in the y-axis direction.

The output of the first A / D converter 44x is C
A first axial-direction blurring speed reduction determination unit 14 and a first axial-direction blurring absolute value determination unit 1 that are configured by a program of the PU 43 and a storage device.
Sent to 7. On the other hand, the output of the second A / D converter 44y is the second output composed of the program of the CPU 43 and the storage device.
It is sent to the axial-direction blurring speed reduction determining unit 15 and the second axial-direction blurring absolute value determining unit 18.

First axial blurring speed reduction determination unit 14, first
Outputs of the determination results of the axial blurring absolute value determining unit 17, the second axial blurring speed reduction determining unit 15, and the second axial blurring absolute value determining unit 18 are sent to the logical operation unit 45, respectively.

The logical operation unit 45 performs the operation of the logical product operation unit 16 described above and other logical operations, and provides information on whether or not there is a problem in starting the blur correction, and the blur correction start signal output unit. 46.

Further, the exposure preparation instruction section 47 in the CPU 43
As described above, the release switch 48 is connected to the camera so that the photographing operation by the photographer can be detected. Furthermore, C
The PU 43 is also connected to the exposure device 7.

The exposure device 7 is a known device for exposing a film, detects the completion of mirror up for retracting the quick return mirror 25 for photographing out of the optical path, and outputs the signal. The mirror-up completion signal output unit 49 and the shutter opening operation unit 50 that performs an operation of passing the light from the subject, which is normally blocked by the shutter, to the film. The mirror-up completion signal output unit 49 transmits an exposure preparation completion signal to the exposure preparation completion detection unit 51 in the CPU 43, assuming that preparation for exposure is completed when the mirror up is completed.

The blur correction start signal output unit 46 receives the signals from the logical operation unit 45 and the exposure preparation completion detection unit 51, and judges that the exposure preparation is completed and that there is no problem in starting the blur correction. In this case, the blur correction unit 2 is instructed to start the blur correction, and the exposure start signal output unit 52 is instructed to output the exposure start signal after the elapse of a predetermined time. The exposure start instruction signal of the exposure start signal output unit 52 is transmitted to the shutter opening operation unit 50 in the exposure device 7, the shutter is opened, and the exposure of the subject image on the film is started.

The mirror-up completion signal output section 49 may be composed of a switch-based state detection device used in a known exposure apparatus. Further, the shutter opening operation unit 50
Similarly, the configuration may be an apparatus to which attraction and repulsion force by a magnet and an electromagnet used in a known exposure apparatus are applied.

In the embodiment, the completion of the exposure preparation is judged by the completion of the mirror up. However, the present invention is not limited to this, and another state detecting means, for example, the completion of narrowing down of the diaphragm is used or a combination thereof is used. You can also do it.

Further, in the embodiment, the signal in the state after the completion of the exposure preparation is used. However, the time delay required for the signal propagation and the actual value after delaying the shake correction by a predetermined value time are used. Considering that the exposure is started, the exposure preparation completion expectation signal that the exposure preparation will be completed immediately after the completion of the exposure before the completion of the exposure may be used within the delay time.

The blur correction unit 2 receives the first A / A signal after the blur correction start signal output unit 46 issues a blur correction start instruction.
The blur correction is performed with a value based on the blur signal from the D converter 44x and the second / AD converter 44y.

In this embodiment, an example is shown in which blurring in the two axis directions of the screen is performed. However, even in the case of performing correction in only one direction, blurring detection and correction need only be made for one axis. The same effect can be obtained with the configuration that is substantially unchanged.

Next, the operation of the CPU 43 will be described with reference to the flowchart of FIG. After turning on the power,
First, in step S1, the AE routine is executed in which the brightness level of the subject is measured and the shutter speed and aperture value for determining the proper exposure of the film are determined. Next, in step S2, the states of various cameras and subjects are displayed on the display device inside or outside the viewfinder of the camera, as is done with known cameras.

Then, in step S3, it is determined whether or not the release switch 48 has been operated. If there is no operation of the release switch 48, step S
Return to 1. On the other hand, if the release switch 48 has been operated, the process proceeds to step S4 to cause the exposure apparatus 7 to use the exposure preparation instruction section 48 to prepare for exposure. In preparation for exposure, the aperture device is narrowed down and the quick return mirror 25 is retracted out of the optical path, as is done with a known camera. After that, exposure is performed until the film can be exposed by opening the shutter. Preparations are made.

While the exposure apparatus 7 is preparing for exposure,
In the CPU 43, in steps S5 and S6, the first A /
Using the D converter 44x and the second A / D converter 44y, the camera shake signal detected by the camera shake sensor unit 1 is digitized, and the reference voltage information AD ₀ is subtracted to obtain camera shake speed information AD ₁ and AD having a value of ±. Convert to ₂ .
When A / D conversion is performed in the range of 0V to 4V,
When there is an output of 2V, the camera shake sensor unit 1 is adjusted so that the angular velocity is zero, and A / A corresponding to this 2V is adjusted.
The value of the D conversion result becomes the reference voltage information AD ₀ .

Next, in step S7, comparing the absolute value of AD ₀₁ is an absolute value and the previous AD ₁ of AD ₁ is a hand-movement velocity information of the first axis direction. Here, if the value this time is small, the blurring is in the decreasing direction and may be further reduced in the future. Therefore, it is considered that the activation delay of the actuator is small even if the camera shake prevention is started. Therefore, the process proceeds to step S8 on the assumption that the camera shake correction is executed in principle. On the other hand, in step S7, if the current camera shake speed in the first axis direction is greater than or equal to the previous value, it is premised that the camera shake correction operation is not performed,
Go to step S9.

In step S8, the same processing as that performed in step S7 is performed for the first axis with respect to the camera shake speed information in the second axis direction, whether there is a decrease in speed. If the shake in the second axis direction is also decreasing, that is, if the shake speed of this time is smaller than the shake speed of the previous time, the process proceeds to step S13 on the assumption that the shake correction is performed. Also this second
If the camera shake speed in the axial direction is greater than or equal to the previous value, the assumption is that the camera shake correction operation is not performed, and the process proceeds to step S9.

In steps S13 and S14, the camera shake speed information AD ₁ and AD ₂ of this time are used as the previous values in the next calculation, so they are stored in the registers AD ₀₁ and AD ₀₂ , and the process proceeds to step S15. In this step S15,
Whether or not the exposure preparation is completed is detected and determined using the exposure preparation completion detecting section 51. If the exposure preparation has not been completed, the process returns to step S5. On the other hand, if it is determined in step S15 that the exposure preparation is completed, the process proceeds to step S16. In step S16, the blur correction unit 2 is instructed to start blur correction.

Next, in step S17, a start margin time waiting routine is executed to wait for a predetermined time. This is a value set between several msec and ten and several msec in order to give a margin to the activation of the actuator. Regarding the margin time, the data may be stored in the storage means as a fixed value, or may be changed according to the magnitude of the camera shake speed, and the margin is reduced when the camera shake is small, and the margin is provided when the camera shake speed is high. May be set larger.

After waiting for a predetermined time, in step S18, the shutter start operation unit 50 of the exposure apparatus 7 is operated to open the shutter by using the output port of the exposure start signal output unit 52.
That is, the start of exposure on the film is instructed. After that, the routine proceeds to step S19, where the normal exposure operation is performed, and the film is exposed for the exposure time set in the AE routine.

Next, in step S20, the shutter is closed, and the next frame photographing preparation process such as re-installation of the quick return mirror in the optical path, withdrawal from the optical path of the diaphragm device, and winding of one film frame is performed. Then, the process returns to step S1.

By the way, in principle, when the process proceeds from step S7 or step S8 to step S9, it is determined that the camera shake correction is not performed. However, when the camera shake speed is exceptionally low, the camera shake correction is performed. Change to the doer. Therefore, in step S9, the camera shake speed is AD ₁
It is determined whether the absolute value of is smaller than the predetermined value AD _th . If it is smaller, in step S10, camera shake speed AD
It is determined whether the absolute value of is smaller than the predetermined value AD _th . If it is smaller, step S13 on the routine side on the premise of correction.
Go to.

On the other hand, step S9 or step S10
If it is determined that the blurring speed is higher than the predetermined value, in steps S11 and S12, the current blurring speed information AD ₁ and AD ₂ is used as the previous value in the next calculation, and thus the register AD is used. After storing ₀₁ and AD ₀₂ , the process returns to step S5.

FIG. 16 is a block diagram showing a simplified configuration of the embodiment shown in FIG. 14 as the second embodiment of the present invention. The difference from the configuration shown in FIG.
It is between the output of the / D converter 44x and the second A / D converter 44y and the input of the shake correction start signal output unit 46.

That is, in the configuration of FIG. 16, the first A / D
The outputs of the converter 44x and the second A / D converter 44y are sent to the camera shake sensor output combiner 53 and converted into moving speed information of an image due to a shake on a plane. This may be a known calculation process for obtaining the magnitude of the vector, or approximately, it may be obtained by adding the absolute values of the shake speeds in the respective axial directions. The camera shake sensor output synthesizer 53
The information on the blurring speed on the plane that is combined in step S1 is obtained by the composite blurring speed decrease determination unit 20 and the composite blurring speed absolute value determination unit 21.
Sent to each.

The operations of the combined camera shake speed reduction determination unit 20 and the combined camera shake speed absolute value determination unit 21 are different only in that the input signals are combined signals.
Since the operations are the same as those of Nos. 4 and 15 and the blur velocity absolute value determination units 17 and 18, detailed description thereof will be omitted here.

The outputs of the combined camera shake speed reduction determination unit 20 and the combined camera shake speed absolute value determination unit 21 are output by the logical operation unit 5.
Sent to 4. The logical operation unit 54 is substantially the same in operation except that the input is different from the logical operation unit 45 of FIG.

In the configuration of FIG. 16, the load on the CPU 43 'may be reduced because it is simpler than that of FIG. It is also possible to improve the accuracy by synthesizing. It should be noted that, in FIG.
Although it is installed in the CPU 43 ', it may be installed between the camera shake sensor unit 1 and the CPU 43' as a means for synthesizing in an analog manner.

Further, in the above-described second embodiment, the image shift optical system by tilting the parallel glass plate is used for image blur correction, but the present invention is not limited to this. For example, in FIG.
As shown in (a), image movement (in the direction of arrow B in the drawing) due to shift (in the direction of arrow A _{1 in the} drawing) of the optical group used for zooming and AF in the optical system, or the final group shown in FIG. Image shift (in the direction of arrow A _{2 in the} drawing) (in the direction of arrow B in the drawing), and image movement in the direction of the arrow C in the front group shown in FIG. The same effect can be obtained by using other optical systems for image stabilization such as (B direction), and it is clear that the basis of the present invention is not based on the optical system.

According to the above embodiment of the present invention, the following constitution can be obtained. (1) Camera shake sensor means for detecting a camera shake signal related to camera shake caused by camera shake, camera shake correction means for correcting camera shake by moving an image on a film, and camera shake speed from the output of the camera shake sensor means. And a blur correction start signal output for outputting a signal for starting blur correction by the blur correction means when the output of the blur speed decrease determination means indicates a decreasing direction. A camera having an image stabilization device, comprising:

(2) From the output of the camera shake sensor means for detecting camera shake signals related to camera shake caused by camera shake, the camera shake correction means for correcting camera shake by moving the image on the film, and the output of the camera shake sensor means. After the end of the shake speed reduction determining means and the exposure start preparation for determining whether or not the blur speed tends to decrease, when the output of the shake speed reduction determining means indicates a decreasing direction, the start of the shake correction by the shake correcting means A blur correction start signal output means for outputting a signal, an exposure start signal output means for outputting an exposure start signal after a lapse of a predetermined time from the output of the blur correction start signal, and an exposure device for exposing a subject image on a film. A camera having an image stabilization device, comprising:

(3) From the output of the camera shake sensor means for detecting the camera shake signal related to the camera shake caused by the camera shake, the camera shake correction means for correcting the camera shake by moving the image on the film, and the output of the camera shake sensor means. Blurring speed absolute value determining means for determining whether the absolute value of the blurring speed is smaller than a predetermined value, and after completion of exposure start preparation, the output of the blurring speed absolute value determining means indicates that the blurring speed is smaller than a predetermined value. In the case shown, a blur correction start output means for outputting a blur correction start signal by the blur correction means, and an exposure start signal output means for outputting an exposure start signal after a lapse of a predetermined time of output of the blur correction start signal, A camera having an image stabilizer, comprising: an exposure device that exposes a subject image on a film.

(4) From the output of the camera shake sensor means for detecting camera shake signals related to camera shake caused by camera shake, the camera shake correction means for correcting camera shake by moving the image on the film, and the output of the camera shake sensor means. Blurring speed reduction determining means for determining whether the blurring speed tends to decrease,
From the output of the camera shake sensor means, a shake speed absolute value determination means for determining whether the absolute value of the shake speed is smaller than a predetermined value, and after completion of exposure start preparation, the output of the shake speed absolute value determination means is the shake speed. Is smaller than a predetermined value, or when the output of the blurring speed reduction determining means indicates a decreasing direction after completion of the exposure start preparation, a signal for starting blurring correction by the blurring correction means is given. A blur correction start signal output means, an exposure start signal output means that outputs an exposure start signal after a lapse of a predetermined time from the output of the blur correction start signal, and an exposure device that exposes a subject image on the film. A camera having an image stabilization device characterized by being provided.

(5) The camera having the camera shake correction device according to any one of (1) to (4), wherein the camera shake sensor means can detect a two-dimensional camera shake on a screen plane. (6) The blurring speed reduction determining unit has two blurring detecting units having blurring sensitivity directions in two axial directions orthogonal to each other on the screen plane, and blurring of signals from the two blurring detecting units. The above (1), which determines whether the speeds of
A camera having the image stabilization device according to (2) or (4).

(7) The blur velocity absolute value judging means has two blur detecting portions having blur sensitive directions in two axial directions orthogonal to each other on the screen plane. From the two blur detecting portions, The camera having the image stabilization apparatus according to (3) and (4) above, which determines whether or not the absolute value of the blurring speed of the signal is simultaneously less than or equal to a predetermined value.

(8) The blurring speed reduction determining means has two blurring detecting portions having blurring sensitivity directions in two axial directions orthogonal to each other on the plane of the screen. A camera including the image stabilization device according to any one of (1), (2), and (4), in which signals are combined and it is determined whether or not the speed of blurring after the combination tends to decrease.

(9) The blur velocity absolute value determination means is
It has two shake detection parts having shake sensitivity directions in two axis directions orthogonal to each other on the screen plane, and the value obtained by combining the shake speeds of the signals from the two shake detection parts is below a predetermined value. A camera having the image stabilization device according to (3) and (4) above, which determines whether or not there is.

According to the configuration of the camera having the image stabilization apparatus described in (1) above, the image stabilization is started when it is considered that the image stabilization start-up is sufficiently small. High image stabilization is possible. Further, according to the configuration of the camera including the image stabilization apparatus according to the above (2) to (4), the image stabilization is started when it is considered that the image stabilization start-up is sufficiently small. It is possible to perform an exposure operation in which highly accurate image stabilization is performed. Further, according to the configuration of the camera having the image stabilization apparatus according to the above (5) to (9), it is possible to accurately perform the image stabilization with respect to the two-dimensional image stabilization on the plane 2 of the screen, and to activate the image stabilization. Since the camera shake correction is started when it is considered that the image blurring is sufficiently small, an exposure operation in which the camera shake correction with high accuracy is performed immediately after the start-up becomes possible.

[0076]

As described above, according to the present invention, it is possible to provide a camera with an anti-shake function, which can suppress the delay of the shake correction and can start the shake correction and the exposure from the vicinity of the center of the shake correction range. it can.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first basic configuration of a camera with an anti-shake function of the present invention.

FIG. 2 is a block diagram showing a second basic configuration of a camera with an anti-shake function of the present invention.

FIG. 3 is a block diagram showing a third basic configuration of a camera with an anti-shake function of the present invention.

FIG. 4 is a block diagram showing a fourth basic configuration of a camera with an anti-shake function of the present invention.

FIG. 5 is a diagram showing a configuration example of a camera shake sensor unit shown in FIGS. 1 to 4;

FIG. 6 is a camera shake detection unit 13 and a camera shake speed reduction determination unit 3a.
It is a figure showing an example of composition.

FIG. 7 is a camera shake detection unit 13 and a camera shake speed reduction determination unit 8a.
It is a figure showing an example of composition.

FIG. 8 is a diagram showing a configuration example of a blur speed reduction determination unit 3b.

FIG. 9 is a diagram showing a configuration example of a blur speed reduction determination unit 8b.

FIG. 10 is a diagram showing three axes of x, y, and z given to the camera.

FIG. 11 is a diagram showing a specific configuration of an embodiment of the present invention, and is a diagram showing an example in which the camera with an anti-shake function is applied to a so-called single-lens reflex camera.

FIG. 12 is a diagram showing a more detailed arrangement of the camera shake sensor unit 1.

13 is a perspective view of the entire tilting device of the parallel glass plate 24 of FIG.

FIG. 14 is a diagram showing a configuration of an electrical signal processing block for preventing image movement due to camera shake.

FIG. 15 is a flowchart illustrating an operation of CPU 43.

FIG. 16 is a block diagram showing a simplified configuration of the embodiment shown in FIG. 14 as a second embodiment of the present invention.

17A to 17C are diagrams showing an example of blur correction other than the image shift optical system due to the tilting of the parallel glass plate.

[Explanation of symbols]

1, 13 ... Shake sensor section, 2 ... Shake correction section, 3 ... Shake speed decrease determination section, 4 ... First shake correction start signal output section, 5
... second blur correction start signal output unit, 6 ... exposure start signal output unit, 7 ... exposure device, 8 ... blur velocity absolute value determination unit, 9 ... third blur correction start signal output unit, 10 ... fourth blur correction start Signal output unit, 11 ... First axial camera shake detection unit, 12 ... Second
Axial camera shake detection unit, 14 ... First axial camera shake speed decrease determination unit, 15 ... Second axial camera shake speed decrease determination unit, 16 ... AND operation unit, 17 ... First axial camera shake speed absolute value determination unit,
18 ... 2nd axis direction blurring velocity absolute value judging part, 19 ... Handshake sensor output combining part, 20 ... Combined blurring speed decrease judging part,
21 ... Synthetic camera shake speed absolute value determination unit, 22 ... Camera body, 24 ... Parallel glass plate (shake correction optical system), 32 ... Shake correction motor, 33 ... Shake correction force transmission unit.

Claims (4)

[Claims] 1. A camera shake sensor means for detecting information on camera shake caused by camera shake and outputting a camera shake signal, and a camera shake correction means for correcting the effect of camera shake by moving a subject image on a film. Judgment means for judging whether or not the speed of camera shake is decreasing based on the camera shake signal, and when the judgment means judges that the speed of camera shake is decreasing, the shake correcting operation by the shake correcting means A camera with an anti-shake function, comprising: a camera-shake correction start signal output means for starting. 2. An exposure start signal output means for outputting an exposure start signal after a predetermined time after the shake correction start signal is output, and the exposure of a subject image on a film is started in response to the exposure start signal. The camera with an anti-shake function according to claim 1, further comprising: 3. A camera shake sensor means for detecting information on camera shake due to camera shake and outputting a camera shake signal, and a camera shake correction means for correcting the effect of the camera shake by moving a subject image on a film. Judgment means for judging whether the absolute value of the speed of the camera shake is smaller than a predetermined value based on the camera shake signal, and when the judgment means determines that the absolute value of the camera shake is small, the shake correction by the camera shake correction means is performed. A camera with a camera shake prevention function, comprising: a camera shake correction start signal output means for starting an operation. 4. An exposure start signal output means for outputting an exposure start signal a predetermined time after the blur correction start signal is output, and an exposure of a subject image on a film in response to the exposure start signal. 4. The camera with an anti-shake function according to claim 3, further comprising: