JPH0266536A - Camera - Google Patents

Abstract

PURPOSE:To incorporate a plactical device which prevents picture blurring by constituting a correcting optical system in such a way that the system is supported in a cantilever manner by at least three flexible supporting poles which have the same length and extend in parallel with a photographing optical axis. CONSTITUTION:A camera has three or more supporting poles having the same length; the supporting poles are flexible, are held in place at one end by a static structure member such a the main body 1 of the camera, and extend in parallel with the optical axis of a photographing optical system. The camera also has a frame 3 holding a lens which compensates for the rocking of the camera, a lens 2 fixed in the lens holding frame 3, and means 18 and 19 detecting the shaking of the camera; the lens holding frame 3 is fixed to the other end of the holding pole 4, in a cantilever manner, and is capable of moving in a plane intersecting orthogonally with the optical axis of the photographing optical system. Since this eliminates the need for complicated sliding and driving mechanisms, the compact camera with the practical device which prevents picture blurring is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a camera, and more particularly to a camera having means for preventing image blur on an imaging plane.

[Prior Art] In recent years, electronic control of cameras has progressed, and the number of cameras in which various operations such as exposure determination, film feeding, and focusing are automatically performed has increased significantly. With such an automated camera, even a person with no knowledge of cameras can take a photograph with proper exposure that matches the bin l~ by pressing the shutter button as many times as possible.

However, with such an automated camera,
Even if you use shadows, you may still end up with a bad photo. The cause of this is camera shake during photographing, and when photographing using an automated camera such as the one described above, photographing failures are most often due to so-called "camera shake".

“In order to prevent photographic failure due to camera shake, conventional cameras have taken the following measures, for example.

In other words, ■ When the outside light is dark, the camera will flash a low-brightness warning lamp (or light-emitting diode) or emit an alarm to warn the photographer that the brightness is low. Countermeasures were taken, such as informing the photographer of the need to use a strobe or tripod, automatically firing a strobe when outside light is dark, and automatically increasing the shutter speed. , In cameras equipped with a low-luminance warning device as described in (2) above, or in cameras equipped with a means for indirectly reducing image blur as described in (2) above, a low-luminance warning is not generated. Shooting in dim light close to the boundary value at which a brightness warning is generated, or near the boundary value where automatic strobe firing and shutter speed increase occur, but automatic strobe firing and shutter speed increase do not occur. When shooting in dim light, camera shake may cause camera shake.
Frequent occurrences of image blur were unavoidable. Also,
Since the image blur preventing means in the known camera is intended to indirectly prevent image blur, it is originally impossible to prevent image blur in all the most scenic situations.

“Failures in shooting due to camera shake are more likely to occur with so-called compact cameras that do not have interchangeable lenses than with single-lens reflex cameras.Especially with compact cameras with telephoto lenses that have recently become commercially available, failures due to camera shake are more likely to occur due to the following reasons: image blur is more likely to occur.

(1) In the case of a telephoto lens, the angle of view is narrow, so the blurring of the image plane becomes large.

(11) Compact cameras use small-diameter lenses to make the camera small and inexpensive, so the F number is also large (the lens is dark). Therefore, the shutter speed is designed to be low to compensate for the large F-number, which tends to cause camera shake.

(Tl+) The weight of the camera is small.

(IV) Since the camera is small and easy to support with one hand, photographers often hold the camera with one hand when taking pictures.

(V) Since the viewfinder magnification is small, even if camera shake occurs, the image in the finder will not shake so much that the photographer will not notice the camera shake.

Therefore, in compact cameras and compact cameras with telephoto lenses, it is especially necessary to prevent image blurring on the imaging plane even if camera shake occurs, but conventionally commercially available compact cameras with telephoto lenses and compact cameras So,
To prevent image blur, make improvements to the grip, such as designing the grip to be easier to hold, or installing two grips so that the camera can be held with both hands, or recommending the use of high-speed film. However, the only measures taken were not to diagnose the disease in the hope that it would have a major effect.

[Problems to be Solved by the Invention] Recently, various proposals have been made regarding devices for preventing image blur in cameras. ′
Since the structure of the compensation optical system is complicated, it is not practical, and is particularly unsuitable for compact cameras and the like. In other words, since the correction optical system for compensating for camera shake must be moved in a direction perpendicular to the optical axis, the holding frame of the correction lens must be supported in a slidable manner, thus avoiding a complicated structure. Moreover, the drive mechanism and drive control means for precisely moving the holding frame in the direction perpendicular to the optical axis are generally complicated and expensive, so known image stabilization devices are not suitable for compact cameras. There wasn't.

Therefore, an object of the present invention is to provide a camera incorporating a practical image blur prevention device.

[Means for Solving the Problems] The present inventor has discovered that "camera shake" has the greatest influence on "image blur" when camera shake occurs due to camera shake, etc.
We conducted the following analysis, and based on the results of this analysis, we developed an image stabilization device with a simple structure that has the greatest image stabilization effect. Therefore, according to the present invention, it is possible to provide a lightweight and inexpensive camera equipped with an image blur prevention device.

The image stabilization device installed in the camera of the present invention consists of at least three or more mutually equal parts fixed at one end to a stationary structural member such as the camera body and extending parallel to the optical axis of the photographing optical system. a flexible support rod having a long length; and a lens holder for camera shake compensation that is fixed in a cantilever manner to the other end of the support rod and moves in a plane orthogonal to the optical axis of the photographic optical system. a frame, a lens fixed to the lens holding frame, an actuator that causes the lens holding frame to move within the plane, and a lens holding frame movement detection means that detects the instantaneous position or speed of the lens holding frame. a camera shake detection means for detecting camera shake; and a control means for controlling the actuator based on the deviation between the output of the camera shake detection means and the output of the lens holding frame movement detection means; The lens holding frame constituting a correction optical system for camera shake compensation is supported in a cantilevered manner by the support rod, and is movable in a plane orthogonal to the optical axis. It is.

The image blur prevention device does not require a complicated slide structure to move the lens holding frame in a direction perpendicular to the optical axis, and also does not require a complicated and expensive drive mechanism, so it is possible to reduce the size of the camera to 11ffi and small size. and can be manufactured at low cost.

When "left camera shake" is detected by the camera shake detection means 18 and 19, the camera shake compensation circuits 20 and 21 calculate the amount of movement to be given to the lens holding frame 3 based on the output of the detection means. At the same time, a current according to the result of the calculation is passed through the coils 6 and 8 which are actuators, and the output of the coils 10 and 12 as a detection means for detecting the moving speed of the lens holding frame 3 and the camera shake detection are performed. Means 18 and 1
The current to be passed through the coils 6 and 8 is controlled according to the deviation from the output of the coil 9. The lens holding frame 3 is moved vertically or laterally in response to the current flowing through the coils 6 and 8, and the support rod 4 is elastically bent as shown in FIG. Lens holding frame 3
The movement of the camera compensates for camera shake, i.e. the image on the imaging plane is held in place so that it does not move.

[Example] The present invention will be described in detail below with reference to the drawings. In addition,
Before entering into a detailed description of the present invention, the principle of occurrence of image blur and an effective method for preventing image blur will be explained with reference to FIGS. 19 to 25.

In FIG. 19, the optical axes of the photographing optical system of the camera are assumed to be two axes, the horizontal axis to the side is the X axis, and the vertical direction is the Y glaze. The degrees of freedom of the camera include three degrees of freedom parallel to each direction of each coordinate axis X, Y, and Z', and three degrees of freedom in the rotational direction around each coordinate axis, for a total of six degrees of freedom. To simplify the explanation, the camera is a full-size camera (screen size 24 x 36 mm) using 35 mm film, and the lens used is an 85 mm telephoto lens (angle of view is 28 degrees diagonally).
30', l' number is F4. O). In addition, in the case of this camera, shooting at a distance of 1.7 m or more (20 times the focal length or more) is defined as ``general shooting'', and the typical distance is 4.25 m, and 0.85 to 1.7 m. (10 to 20 times the focal length) is defined as ``close-up photography'', and its representative distance is 13 m. Further, the case where the photograph is taken at a distance shorter than 085 m is defined as close-up photography, and its representative distance is set to 043 m.

A case in which image blur occurs in the camera and lens as described above will be described below.

1. Movement in the X-axis direction (lateral shake) As shown in Figure 20, if the distance from the lens L to the subject O is a, and the distance from the lens L to the film F is b, then if the camera If the camera moves by D in the horizontal direction due to camera shake, then the subject is considered to be a static camera. This corresponds to moving by D in the lateral direction.

Therefore, if the magnitude of the blur, that is, the amount of image movement on the imaging plane is d, the focal length of the lens is f, and the lateral magnification is m, then
The following formula holds true.

From these two equations, the deflection size d is given by: General tli! Shadow Pa°゛Close-up°°゛Close-up°
Let's examine the magnitude of the horizontal shake in each case.

(i) For general photography (a=4.25 meters).

This image blur is not noticeable on a service size print, but when enlarged to a higher magnification, the image blur becomes easily noticeable, so it can be said that horizontal blur has an adverse effect on close-up photography.

(iii) In the case of close-up photography (a = 0.43 meters) If the camera shakes by 1 mm, the image blur on the film surface will be 0.02 mm.

When using 35mm film, set the diameter of the allowable circle of confusion to 0.
．． 035++on, the above-mentioned image blur is smaller than the permissible diameter of the circle of confusion, so this image blur will not be recognized on the photographed photograph. In other words, even if camera shake occurs, image blur will not occur.

(11) In the case of close-up photography (a = 1.3 meters), the image moves 0.07 mm when shaken, so the allowable circle of confusion diameter is 0.
The amount of image blur is twice that of 035mrQ. Therefore, in the case of a service size print with an enlargement magnification of approximately 3.5 times, the image blur on the print is 0.25 mm.Therefore, if the camera movement is 1 mm, the image on the film surface will be 0.25 mm.
．． This results in a movement of 246n++n, resulting in an image blur of approximately 0.9mm on a service size print. Therefore, in close-up photography, it can be seen that horizontal camera shake causes large image blur on the film surface.

2. Movement in the Y-axis direction (vertical shake) Vertical shake is exactly the same as horizontal shake. Therefore, in the case of close-up photography, image blurring occurs in prints with an enlargement magnification equal to or higher than the service size, and in the case of close-up photography, significant image blurring occurs even in service-size prints.

3. Movement in the Z-axis direction (back and forth shake) This will be explained with reference to FIG. 21. As above, lens L
The distance between and object 0 is a, the distance between lens L and the film surface is b, the focal length is f, and the effective radius of lens L is r,
The relative movement amount of object 0 in the optical axis direction is Zo (actually, it is the movement amount of lens L in the optical axis direction, but since the camera is set in a stationary coordinate system, it is expressed as the movement amount of object 0), and the light of object O is Axial relative movement amount Z.

If the amount by which the image moves 8 times on the film F in the direction orthogonal to the optical axis is ρ, and the amount by which the image moves in the optical axis direction is 21, then the following equation holds true.

Next, transforming (3, 1), substituting (3, 5) into (3゜4), on the other hand, (3,
3), that is, (3, 8) is the amount of movement of the image in the optical axis direction, and (3, 8) is the amount of movement of the image in the optical axis direction.
7) represents the amount of movement in the direction perpendicular to the optical axis.

(i) For general photography (a = 4.25 meters) Za =
If it is 1 mm, then a = 425 CI. Of the three equations above, first, if you transform equation (3, 2), it becomes (), and by substituting f = 85 into (3, 5) to (3, 7), , Z , = 4.17X 10-' b =
81+, 732693, ρ=5 x 10-5. Therefore, both Z+ and ρ are very small and can be ignored. In other words, image blur cannot be recognized.

(11) For close-up photography (a = 1.3 meters) a =
1300, f=85, r=10.625, Z0=
Substituting 1 into each of the above formulas (3, 5) to (3, 7),
Z I = 4.898x 10-3, b = 90.9
465, we get ρ=5.721X10-5. Therefore, in this case as well, since both Zl and ρ are small, image blur cannot be recognized.

(iii) For close-up photography (a = 0.43 meters) a
=430, f =85, r = 10.625,
Substituting Z0=1 into the above (3,5) to (3,7), Z
, =0.01+09, b = 105.942, ρ
=O,0OIi is obtained. Therefore, in this case, a slight image blur occurs, but since the value of ρ is small, the effect of the image blur on the quality of the photograph is small.

4 Rotation around the X axis (angular deviation around the horizontal axis) This will be explained with reference to FIG. 22.

If the camera is shaken by an angle θ around the X-axis, the subject will move vertically by aθ relative to the lens, and the image on the film surface will move vertically by d=bθ. .

Therefore, the following equation holds true in FIG.

d=b θ (4,2) is obtained. Assuming that the width of the camera is 140 mm, if the edge of the camera moves by 1 mm, the blur angle θ will be: (i) For general photography, substitute (a - 4, 25 meters) and get d = 1.24 mm. obtain. In other words, since the image blur on the imaging plane is 1.24 mm, the image blur can be recognized with the naked eye, resulting in a considerable adverse effect.

(100) For close-up photography (a = 13 meters), substitute d
= 1.30mm is obtained. Therefore, in this case as well, image blur that can be recognized with the naked eye occurs, and the situation is even worse than in the case of general photography.

(i i i) In the case of close-up (a = 0.43 m), substitute to get d = 1.513 mm. Therefore, image blur becomes even greater than in the case of close-up photography.

Note that when a>f, dyfθ becomes the image blur amount d
is proportional to the focal pressure Rf, so the focal length is long (I see)
In other words, the more you shoot into a telephoto position, the more the amount of image blur increases.

Therefore, it can be seen that a camera with a telephoto lens has a higher probability of producing a blurred photograph and a larger amount of blur than a camera with a wide-angle lens. Furthermore, it can be seen that in cameras with a telephoto lens, among camera shakes, angular shakes have a particularly large negative effect on image shakes.

5. Rotation around the Y-axis (angular deviation around the horizontal axis) Angular deviation around the Y-axis can be discussed using the same analytical method as angular deviation around the X-axis. Therefore, in any of general photography, close-up photography, and close-up photography, the amount of image blur is the value calculated in the previous section 4.

6. Rotation around 2 axes (angular shake around the optical axis) As shown in Figure 23, when the camera is rotated by a small angle θ around the optical axis, there are (6, 1) A blur expressed by the formula appears.

d=Rθ... (6,1) Note that R is 35
mm The length of the diagonal line of one frame of film, R = 21
．． It is 6. In addition, the value of θ is the numerical value of R and θ mentioned above (
5,1), we get d=0.31. That is, a blur of 0.31 mm will occur at the periphery of the screen. This value is considerably smaller than the case of angular deviation around the X glaze examined in the previous section 4, and moreover,
Since the amount of blur at the center of the screen (R=O) is 0,
It can be said that the negative effect of this blurring on the quality of the photograph is small.

Also, in general, when framing a photo, the main subject is often set in the center of the screen, so even if there is some blur at the periphery of the screen, that blur will not cause a significant drop in the quality of the photo. It's hard to do. Moreover, since the peripheral portion of the screen is originally a place where image distortion is likely to occur due to various aberrations of the lens, the influence of the above-mentioned blur can be almost ignored.

Note that rotation around the Z-axis (optical axis) does not cause image blur that significantly impairs the quality of the photograph, as described above, but rotation around an axis parallel to the Z-axis This includes rotation in the direction, Y-axis direction, and rotation around the Z-axis, which causes image blur that impairs the quality of the photograph.

As explained above, when a slight movement occurs in the camera due to camera shake or the like during photographing, image blur becomes a problem in the following cases.

A. In the case of general photography (a = 4.25 meters), angular shake around the X axis and Y! Angle shake around 1III.

B, Angular shake around the X-axis and angle around the Y-axis for close-up photography (a = 1.3 meters). Furthermore, when the amount of movement in the X-axis direction and the amount of movement in the Y-axis direction is large, image blur caused by movement in these directions also becomes a problem.

In the case of C9 close-up photography (a = 0.43 meters), not only angular blur around the X-axis and Y-axis, but also movement in the X- and Y-axis directions causes considerable image blur; Image blur due to this cannot be ignored. Furthermore, when rotation about an axis parallel to the Z axis occurs, the influence of image blur caused by this rotation cannot be ignored.

In order to cause the above-mentioned image blur, it is necessary to move the photographing optical system so as to offset the movement that occurs in the camera.

As mentioned above, the camera movements that cause the greatest image blur in general photography, close-up photography, and close-up photography are rotational movement around the X- and Y-axes and linear movement in the X- and Y-axis directions. When these movements occur, moving the photographing optical system so that the image on the imaging plane does not move can prevent image blurring on the imaging plane. Specifically, when the camera swings around the X- and Y-axes or moves in the X- and Y-axis directions, the imaging plane or photographing optical system is moved in a direction that offsets the movement of the image on the imaging plane. By swiveling the image, it is possible to prevent image blur from occurring. A practical example of such an image blur prevention method is, for example, a starry field camera used in an astronomical observatory. In star photography, image blur is prevented by rotating the camera at a rotational angular velocity ω in the opposite direction to the blur direction. However, although such an image blur prevention device is suitable for large-sized photographic devices, it is not suitable for small-sized photographic devices such as hand-held cameras.

In the present invention, image blur is prevented by swinging the photographing optical system at the image blur speed.

24 and 25 are diagrams for explaining the principle of the image blur prevention method applied to the camera of the present invention.
The figure shows the movement of an image on the imaging plane when the camera swings around the Y-axis or the X-axis, and FIG. 25 is a diagram for explaining the principle of preventing image blur.

When the photographic lens L of the camera is swung at an angular velocity ω due to camera shake, etc., if the lens L is assumed to be stationary, then
Both the image on the imaging plane and the subject move at an angular velocity ω in a direction perpendicular to the photographing optical axis. In FIG. 24, if the movement of the image on the imaging plane is a>f, it can be set to v/fω.

FIG. 25 is a diagram showing the principle of a method for canceling image blur. In the figure, when there is no camera shake, it is assumed that point O1 on the optical axis 1 is imaged by the lens at the center point 0° of the film F, and if camera shake occurs and only the lens tilts, then
The image that was focused on the center point O'' of the film F will move to the point O'' after a certain period of time.Let the angular velocity of the tilting of the lens L due to camera shake be ω, and the moving speed of the image on the film surface be Then, since v=bω, image blurring on the film surface can be prevented by moving the lens L at a speed of {circle around (2)} in the opposite direction to the image movement direction on the film surface.

In such an image blur prevention method, ■ changes depending on the distance a to the subject due to the lens, and therefore,
In order to accurately control (2), the output of the distance measuring device must be used.

Further, the value of ω needs to be obtained from the output of an angular accelerometer mounted on the camera.

Note that when implementing the above image blur prevention method in an electronic still camera, etc. in which an image element such as a COD is placed on the image forming surface instead of a silver halide film, angular and lateral shakes can be detected from the output signal of the image element. Since it is possible to simultaneously detect the two without distinguishing them, there is no need to take in the range finder output or the angular accelerometer output to control the moving speed of the lens L.

Based on the above studies regarding image blur °°, the image blur prevention device in the camera of the present invention is designed to prevent image blur caused by rocking around the X-axis and image blur due to rocking around the Y-axis. It is configured.

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

In FIG. 1, 1 is a camera body, and 3 is a lens holding frame that supports a lens 2 for camera shake compensation. As shown in FIG. 1, the lens holding frame 3 has a shape similar to a square plate with the central part of each side cut out, and one end of a support rod 4 described later is connected to the four corners of the lens holding frame 3. A cylindrical screw 15 is provided.

Reference numeral 4 denotes four flexible support rods having one end fixed to the lens holding frame 3 and the other end fixed to the rear plate portion of the camera body 1 to support the lens holding frame 3 in a cantilevered manner. , is. As shown in FIG. 2, the support rod 4 has a metal core material 4a made of phosphor bronze whose periphery is covered with a flexible elastic material 4b such as rubber, and both ends of the metal core material 4a extend from the end surface of the flexible elastic material 4b. It is supported by a screw 15 protruding outward and fixed to the lens holding frame 3 and a screw 16 of the camera body 1, respectively, by soldering or the like. The screws 15 and 16 and the support rod 4 are
As shown in the figure, the center angle is 45° on the circumference of a circle with a diameter 2r larger than the diagonal length of the aperture 1a of the camera body 1.
arranged at intervals. The support rods 4 are arranged parallel to the optical axis and have equal lengths. Since the lens holding frame 3 is cantilever-supported at the ends of four equal length support rods 4, the lens holding frame 3 cannot move in a direction perpendicular to the optical axis as shown in FIG. At that time, the support rod 4 is elastically bent.

A coil 6.8° 10.12, which is wound around a rectangular cross-sectional shape, is fixed to the lens holding frame and placed in the notch on each side of the lens holding frame 3. As shown in FIG. 1, four yokes 5, 7, 9.11 fixed in a cantilever manner with screws 17 form a pair with the coil, and the coils and yokes actuate two electromagnetic actuators. Two lens holding frame moving speed detecting means are configured. At the tip of each yoke 57, 9, 11, as shown in FIG. 3 extending in the direction (perpendicular to the optical axis)
Teeth or protrusions 5a to 5c and 9a to 9c are formed, and the central protrusions 5c and 9c are inserted into the coil 6 and the coil 1o. Permanent magnets 5d, 5c, 9d, and 9c are fixed to the protrusions 5a and 5b, 9a, and 9b, which are arranged with the protrusions 5c and 9c in between.

The yoke 5 and the permanent magnets 5d and 5c attached thereto constitute a stationary part of an electromagnetic actuator for moving the lens support frame 3 in the Y-axis direction, and the coil 6 serves as a moving part of the electromagnetic actuator. In other words, it has a moving coil type configuration. Further, the yoke 9, the permanent magnets 9d and 9c, and the coil 10 constitute a moving speed detecting means for detecting the moving speed of the lens holding frame 3 in the Y-axis direction. The yoke 7 and the coil 8 constitute an electromagnetic actuator for moving the lens holding frame 3 in the X-axis direction, and the yoke 11 and the coil 12 constitute an
It constitutes a moving speed detection means for detecting the axial moving speed.

Reference numeral 18 denotes a first camera shake detection means for detecting the angular velocity of the camera shake movement around the X axis, and 19 a second camera shake detection means for detecting the angular velocity of the camera shake movement around the Y axis. The detection means includes, for example, a known gyro or angular velocity sensor.

FIG. 6 is a schematic wiring diagram of electrical devices related to the image blur prevention device and the exposure mode determining means. In the same figure, 6
, 8, 10. 12 are the aforementioned coils, 18 and 19 are the camera shake detection means, and 20 is an image blur on the imaging plane (at the aperture 1a) due to camera shake when camera shake occurs around the X axis. a first blur compensation circuit 21 that calculates the camera shake compensation movement amount or speed that should be applied to the lens 2 in order to control the current to the coil 6;
2 is a second blur compensation circuit that calculates the compensatory movement amount or speed to be applied to the lens 2 to prevent image blur when camera shake occurs around the Y axis, and controls the current to the coil 8; 26 is a known photometer circuit, 27 is a known distance measuring circuit, 28
is a known strobe light emitter. The image stabilization device is
Camera shake detection means 18 and 19, first and second shake compensation circuits 20 and 21, two electromagnetic actuators consisting of the yoke and coil, two lens holding frame movement amount detection means, lens 2 and lens holding frame 3. It also includes a correction optical system including a support rod 4, and the like.

Control operations in the image blur prevention device configured as described above are as follows. That is, when an angular shake about the X-axis occurs in the camera, an output voltage corresponding to the magnitude and direction of the camera shake is generated from the camera shake detecting means 18, and this output voltage is input to the first shake compensation circuit 20. Ru. The blur compensation circuit 20 takes in the output of the camera shake detection means 18, calculates a current in the coil 6 corresponding to the amount of image blur compensation movement to be applied to the lens holding frame 3, and controls the current to flow into the coil 6. perform an action. When the current flows into the coil 6, the electromagnetic force generated between the coil 6 and the yoke 5 forces the coil 6 and the lens holding frame 3 in the Y-axis direction. Therefore, the lens 2 is centered around the base end of the support rod 4 (the end fixed to the camera body 1).
The object is moved in the Y-axis direction roughly along an arcuate surface whose radius is the length of , and as a result, the image on the imaging plane is held at the same position as if no camera shake had occurred. When the lens holding frame 3 is moved in the Y-axis direction, the relative positional relationship between the coil 10 and the yoke 9 changes, so an induced current is generated in the coil 10, and a voltage 48 corresponding to this induced current is generated.
The signal is input to the blur compensation circuit 20 as a feedback signal. Therefore, the blur compensation circuit 20 calculates the image blur movement compensation amount corresponding to the deviation between the output of the coil 10 and the output of the camera shake detection means 18, and supplies a current corresponding to the calculation result to the coil 6, so that the image can be imaged. The position or speed of the lens 2 for blur compensation is controlled.

Further, when an angular shake about the Y axis occurs in the camera, the image shake prevention control operation as described above is performed by the camera shake detecting means 1.
9, a blur compensation circuit 21, a coil 8 as an electromagnetic actuator, a coil 12 as means for detecting the amount of movement of the lens 2;
, etc., in the same manner as above.

By the way, in the above configuration, the camera shake detection means 18
The other control elements and control loops for the image stabilization position will change somewhat depending on whether 19 is an acceleration sensor, a speed sensor, or a position sensor. It is clear that this is not a woody change. For example, although the moving speed of the lens holding frame 3 is detected as a detection method for detecting the movement of the lens holding frame 3, the position may also be directly detected. Furthermore, as a method of controlling the lens holding frame 3, the moving speed may be controlled, but the position of the holding frame 3 may also be directly controlled.

FIG. 7 shows a method for detecting the movement of the lens holding frame 3 using a known P-electromotive force generator instead of the speed detection type induced electromotive force generating means consisting of a combination of a coil, a permanent magnet, and a yoke as described above.
S D (Position Sensing De
This is an actual 3fti example using position sensors 22 and 23 made of semiconductor devices such as 3fti.

The position sensors 22 and 23 are fixed to the lens holding frame 3, and an eighth position sensor is located opposite to the position sensors 22 and 23.
As shown in the figure, light emitting elements 24 and 25 having slit-shaped light emitting surfaces 24a and 25a are attached to a stationary structural member (not shown). In this embodiment, when the lens holding frame 3 moves, for example, in the Y direction, the position sensor 23
A signal representing the instantaneous position of the lens holding frame 3 in the Y direction is generated, and when the lens holding frame 3 moves in the X direction, a signal representing the instantaneous position of the lens holding frame 3 in the X direction is generated from the position sensor 22. If a position sensor such as a semiconductor element is used as a means for detecting the amount of movement of the lens holding frame 3 as in this embodiment, the advantage is that the camera heavy equipment can be made smaller and more compact than in the embodiment shown in FIG. There is.

Note that the position sensors 22 and 23 are connected to the lens holding frame 3.
As shown in FIG. 9, it is desirable that the Y-direction position detection sensor 23 is installed on the X-axis, which is orthogonal to the optical axis.
It is desirable to select a position on the Y axis perpendicular to the optical axis. The reason for this is as described below, when a downward electric force is generated by the coil 6 from a position where the center CL of the lens 2 is already shifted from the center CP of the camera, the electromagnetic force includes a horizontal component FR. Therefore, if the position sensor 22 is installed at the positions B and C in FIG. 9, the rotation moment due to the horizontal component F8 acts on the lens holding frame 3. This is because the detected values of the amount of vertical movement will be different values from each other.

In FIG. 9, C1 is the center of the camera's aperture (that is, the center of the film surface), and is the point that becomes the optical axis when the camera is directed toward the ceiling. CL is the optical axis of the lens, and is located at a position shifted in the X direction with respect to the film center C2. Here, when the coil 6 is energized to move the lens holding frame 3 downward in the Y direction, an electromagnetic force F is generated in the coil 6 because the center of the lens holding frame 3 and the film center c2 are misaligned. The point of application of force is considered to be point A as shown in Figure 9. Therefore, the electromagnetic force FC is divided into a force F parallel to the line segment connecting point A and the lens optical axis cL, and a force FR in the horizontal direction.
When considered by breaking it down into the following, F becomes a force that causes the lens holding frame 3 to move in translation, and FR becomes a force that rotates the lens holding frame 3 around the lens center CL.

In this case, the position control of the lens holding frame 3 is performed as follows.

Since the lens holding frame 3 moves in the X direction and the Y direction due to the force FD, the movement in the Y direction is detected by the position sensor 22 and the current flowing through the coil 6 is controlled, and the movement in the X direction is detected by the position sensor 23. The movement of the lens holding frame 3 in the X direction is suppressed by passing current through the coil 8 so as to generate an electromagnetic force that cancels out the force in the X direction.

On the other hand, the force FR applies a translational force in the -X direction as well as a rotational moment about the lens center cL to the lens holding frame 3. Therefore, in order to avoid applying force in the -X direction to the lens holding frame 3, the position sensor 23 moves the lens holding frame 3 to -X direction.
The directional movement is detected and the current in the coil 8 is controlled.

Note that if the position sensor 22 is attached to the lens holding frame 3 on the Y axis passing through the center of the lens 2, the force FR
There is no adverse effect of rotational moment caused by position sensor 2.
The output of No. 2 does not include an error due to the rotational moment.

However, if the center of gravity of the lens holding frame 3 is not on the Y axis, an error due to the rotational moment of the force FR will be included in the output of the position sensor 22, but the error in the center of gravity is generally extremely small and can be ignored. becomes.

FIG. 10 is a perspective view of a main part showing a second embodiment of the present invention, in which the same components as in the first embodiment are indicated by the same symbols as in FIG.

In this embodiment, the coils 10 and 12 serving as the 8-motion detection means of the lens holding frame 3 and the yokes 9 and 11 paired with the coils also serve as restraint means for restraining the lens holding frame 3. This embodiment is also different from the first embodiment in that a sliding barrier 44 associated with the restraining means is provided.

In FIG. 10, switches 42 and 43 are switches arranged to engage with the lens barrier 44 when the sliding lens barrier 44 is in the barrier open position, and the switches 42 and 43 do not engage with the lens barrier 44. Sometimes it is configured as a normally closed switch that is always closed. The two contacts of the switch 42 are connected to both ends of the coil 10, and are wired so that the coil 10 is short-circuited when the switch 42 is closed. Further, the two contacts of the switch 43 are also connected to both ends of the coil 12, so that the coil 12 is short-circuited when the switch 43 is closed.

When the lens barrier 44 is in the open position, a click spring 45 is fixed to the camera front cover or the like and has a protrusion 45a that protrudes downward in a V-shape above the lens barrier 44. Two click grooves 44a and 44b into which the protrusion 45a falls are formed.

When the projection 45a of the click spring 45 falls into the click groove 44a, the lens barrier 44 is locked in the open position, and when the projection 45a falls into the click groove 44b, the lens barrier 44 is locked in the closed position.

44c is a barrier operation knob formed integrally with the lens barrier 44, and the operation knob 44c is exposed on the front cover of the camera.

33 is the barrier 4 when the lens barrier 44 comes to the open position.
4, and the switch 33 is open when the lens barrier 44 is positioned at the barrier closed position (solid line position in the figure).

In the embodiment shown in FIG. 10, when the lens barrier 44 is positioned at the barrier closed position that shields the lens 2 as shown by the solid line in the drawing, the switch 33 is opened and the power source (not shown) and the coil 6.8° 10. Since the connection with coil 12 is cut off and switches 42 and 43 are closed, both ends of coils 10 and 12 are short-circuited, respectively, and coils 10 and 12 constitute a closed circuit by themselves.

In such a state, for example, if the camera is dropped and the lens holding frame 3 is violently moved, the coils 10 and 12 will have an induced electromotive force in the direction that suppresses the relative movement that occurs between the coils and the pair of yokes. occurs, so the coil 10
The coil 1 is connected between the coil 1 and the yoke 9 due to the induced electromotive force.
An electromagnetic force is generated that prevents the movement of the coil 12 and the yoke 11, and the induced electromotive force causes the coil 12 to move between the coil 12 and the yoke 11.
An electromagnetic force is generated that prevents the movement of. Therefore, the lens holding frame 3 is substantially clamped by the electromagnetic force, and the operation of the image stabilization device is prohibited.

In addition, vibration of the lens holding frame 3 is prevented, and destruction or distortion of the image blur prevention device including the correction optical system is prevented.

In this embodiment, the coils 10'EL and 12 are short-circuited only when the lens barrier is closed, but regardless of whether the lens barrier is open or closed, if an acceleration of more than a predetermined value is applied to the camera Sometimes coil 6.8.10
．． 12 may be automatically short-circuited and the lens holding frame 3 may be restrained by electromagnetic force.

FIG. 11 shows a modified embodiment of the embodiment shown in FIG. 10, and the members in FIG. 11 labeled with the same symbols as in FIG. 10 are the same as the members shown in FIG. 10. be.

In a third embodiment of the invention shown in FIG.
The normally closed switches 42 and 43 for short-circuiting the lens barrier 44 and the release button 4 do not contact the lens barrier 44.
This differs from the embodiment shown in FIG. 10 in that it is arranged so as to be interlocked with 6. That is, in the embodiment shown in FIG. 11, when the photographer presses the release button 46 and distance measurement and photometry are completed within the camera, the autofocus mechanism operates and the focus adjustment is completed.
and 12 are released, and from that point onwards, coil 1
Coils 0 and 12 operate as lens movement amount detection means of the correction optical system of the image blur prevention device, but before that point, both coils function as clamping means for the lens holding frame 3. Therefore, in this embodiment, even if the camera is dropped while the lens barrier 44 is open, if the focusing operation has not yet been completed, even if the camera is attacked by the Confederate forces, the correction optical system will not work. There is less fear of going crazy or destroying things. Of course, in the non-photographing state when the lens barrier is closed, the coils 10 and 12 are always short-circuited and function as clamping means for the correction optical system, so even if a strong impact is applied to the camera in this state, the coils 10 and 12 are always short-circuited. ,
The correction optics are not moved significantly.

In FIG. 12, the lens holding frame 3 is triangular, and the holding frame 3
This figure shows an example of a correction optical system in which the support rod 4 that supports the angle is three-dimensional.

In this embodiment, three support rods 4 are fixed at each vertex of the lens holding frame 3', and two actuators are provided to move the holding frame 3'. The first actuator consists of a yoke 9 and a coil 10, and the yoke 9 is fixed to the rear plate of the camera body 1 in a cantilevered manner as in the previous embodiment. The second actuator consists of a yoke 11' and a coil 12', and the yoke 11' is also fixed to the rear plate of the camera body 1 in a cantilevered manner. The coils 10 and 12' of each actuator are fixed to the lens holding frame 3' at the central notches of the horizontal and oblique sides of the lens holding frame 3', and the coil 10 is fixed to the first
The coil 12° is similarly electrically connected to a second camera shake compensation circuit 21.

Since the second actuator installed on the oblique side of the lens holding frame at 3° generates a force in a direction perpendicular to the oblique side,
The first actuator is configured to generate an upward force that offsets the downward force generated by the second actuator so that only the horizontal component of the force is effectively used when the second actuator is actuated. Control is performed by both circuits.

In this embodiment, the camera shake detection means corresponds to the actuator, and includes a first camera shake detection means 18 for detecting camera shake around a horizontal axis, and a first camera shake detection means 18 for detecting camera shake around a horizontal axis, and a first camera shake detection means 18 for detecting camera shake around a horizontal axis, and a first camera shake detection means 18 for detecting camera shake around a horizontal axis, and a first camera shake detection means 18 for detecting camera shake around a horizontal axis, and a first camera shake detection means 18 for detecting camera shake around a horizontal axis, and a first camera shake detection means 18 for detecting camera shake around a horizontal axis, and a first camera shake detecting means 18 for detecting camera shake around a horizontal axis, and a first camera shake detecting means 18 for detecting camera shake around a horizontal axis, and a first camera shake detection means for detecting camera shake around a horizontal axis. A second camera shake detection means 19° for detecting camera shake is provided.

In the case of this embodiment, although there is a drawback that the control operation of the actuator is more complicated than in the embodiment shown in FIG.
It has the advantage that it is easy to make the surface parallel to the vertical.

In the case of this embodiment, since it is not possible to provide a detection coil at a position facing each actuator as shown in FIG. 1 as a means for detecting the amount of vertical movement of the lens holding frame 3, the method shown in FIG. ) as shown in the lens holding frame 3.
Position sensors 22° and 23 (position sensors 22 and 23 shown in FIG. 7) fixed to stationary fixing members detect movement of light emitting elements 3a and 3b (same as light emitting device 24 shown in FIG. 8) fixed at 23) may be used for detection.

FIG. 13 shows a fifth embodiment of the present invention. The camera of this embodiment is a camera having a zoom lens, and the configuration of the correction optical system shown in the first to fourth embodiments is applied to the rear group lens 11 assembly.

In FIG. 13, 50 is a fixed barrel of a zoom lens attached to the camera body 1, and 51 is a first and a second lens on the circumferential surface.
A movable barrel 52 is formed with a cam groove and is fitted in the fixed barrel 50 so as to only rotate.
The front group lens 5 has a pin that engages with the cam groove of the
a front group lens barrel that carries 3 and moves back and forth within the movable barrel 51;
Reference numeral 54 has a pin that engages with the second cam groove of the movable barrel 51, and a lens holding frame 56 of the rear group lens 55 (this lens corresponds to the lens 2 of the above embodiment). This is a rear group lens barrel that supports a lens holding frame (corresponding to the lens holding frame 3 of the embodiment) via a support rod 4 in a cantilevered manner.

In the above configuration, when the movable barrel 51 is rotated, the front group barrel 52 and the rear group barrel 54 are rotated relative to the movable barrel 51 along the axial direction, for example, as shown in FIG.
By moving the front group lens 53 and the rear group lens 55 from the position shown in FIG. 13(b), the magnification of the photographing optical system is changed.

In this embodiment, the rear group lens constitutes a correction optical system for preventing image blur as already explained in the previous embodiment, so even if camera shake occurs, the occurrence of image blur can be suppressed.

In this embodiment, the rear group lens holding frame 56 is equipped with the actuator and lens holding frame displacement amount detecting means described in the previous embodiment.

In the camera with the image stabilization device described above,
Compared to a conventional camera without an image stabilization device, it is necessary to take into consideration the camera shake compensation range of the image stabilization device in addition to the photometry results and distance measurement results as a factor in determining the exposure mode. That is, in a range where camera shake cannot be compensated for, it is often impossible to take a picture that corresponds to the shooting situation even if the exposure mode is determined based on the photometry and distance measurement results.

In consideration of such circumstances, the camera of the present invention is equipped with an automatic exposure mode selection means for automatically selecting an exposure mode suitable for a camera equipped with an image stabilization device, and the automatic exposure mode selection means is configured to execute the exposure mode determination methods shown in Tables 1 to 3 below.

Table 1 shows the simplest exposure mode determination method in which the exposure state is changed depending on whether camera shake can be compensated for by the image blur prevention device.

Table 1 In the exposure mode determination method shown in this table, depending on the degree of camera shake or whether the vibration is compensated for by the image stabilization device, External light photography (AE)> or strobe photography (FA) performed at a specific shutter speed> is selected.

However, it is clear that the exposure mode determination method shown in Table 1 is often unable to deal with complex actual photographic situations. Therefore, Table 2 shows an exposure mode determining method configured to cope with actual complex photographing situations.

In Table 2, λ is the distance to the subject (distance measurement result), GN is the guide number of the strobe light emitter, and F is t.
It is the F number of the lens of the IT optical system.

In the exposure mode determination method shown in Table 2, the exposure mode is determined based on whether camera shake correction is possible in the image stabilization device and the reach distance of the strobe light. Can be applied to complex shooting situations.

However, the exposure mode determination method shown in Table 2 does not assume a shooting situation where the self-timer is used.
Not suitable for taking pictures using the self-timer. When taking pictures using a self-timer, the camera is often mounted on a stationary object such as a tripod, so camera shake is generally not expected to occur, and therefore camera shake compensation using an image stabilization device is ineffective and unnecessary. be. On the other hand, when shooting using a self-timer, the camera user is often the subject, so photometry and distance measurement are often performed on the distant scenery rather than the subject, and therefore the shutter speed is low (shutter opening/closing time (long) is often set. As a result, instead of "camera shake",
“There is a high possibility that subject blur°° will occur.

For the above reasons, it is necessary to further add the exposure mode determination method when using the self-timer to Table 2.

Therefore, Table 3 shows an exposure mode determination method that is designed considering a shooting situation in which a self-timer is used.

According to the exposure mode determination method in Table 3, when taking pictures using the self-timer, if the shutter speed determined based on the photometry results is relatively slow, regardless of whether or not the strobe light reaches the subject, Strobe photography will be performed at a specific shutter speed. In other words, according to Table 3, when taking pictures using the self-timer, when the outside light is bright, non-stroboscopic photography (external light photography) AE is selected at the shutter speed determined based on the photometry results, and when the outside light is dark, Sometimes, strobe photography (FA) is selected at a specific shutter speed other than the shutter speed based on the photometry results, regardless of whether the subject is far or near. Therefore, according to the exposure mode determination method shown in Table 3, even when shooting using a self-timer, the possibility of "subject shake" occurring is extremely low.

Next, the structure and operation of the exposure mode determining means for executing the exposure mode determining methods shown in Tables 1 to 3 will be explained.

14 is a flowchart showing the exposure mode determination program corresponding to Table 1, FIG. 15 is a flowchart showing the exposure mode determination program corresponding to Table 2, and FIG. 16 is a flowchart showing the exposure mode determination program corresponding to Table 2.
The figure is a flowchart showing an exposure mode determination program corresponding to Table 3.

The contents of the symbols displayed in FIGS. 14 to 16 are as follows.

5W-1 + switch that is turned on during the first stroke when the camera's shutter release button is pressed 5W-2: the second switch when the shutter release button is pressed
Switch 5W-3, which is turned on with the stroke of Subject distance TA determined by: No. 17
The time explained in the figure and FIG. 18 (represents the camera shake compensation range in the image stabilization device) T: Predetermined shutter opening/closing time for strobe photography (specific shutter speed for strobe photography) F: Photography Lens aperture value of the optical system (F number) T, Shutter opening/closing time (shutter speed) that may cause subject blur GN: Strobe light emitter guide number Figures 17 and 18 are as described above. This is a graph for explaining the meaning of TA. In the same figure, C1 and C2 represent temporal changes in the amplitude of "camera shake", and R is a camera shake compensable value in the image stabilization device (shake prevention device). [It] (that is, the range in which the lens 2 can be moved in a direction perpendicular to the optical axis).

Fig. 17 shows a case where the maximum amplitude of camera shake exceeds the camera shake compensable range R in the image stabilization device, and Fig. 18 shows a case where the maximum amplitude of camera shake exceeds the camera shake compensable range R in the image stabilization device. This shows the case where it is within R.

In the camera of the present invention, when the maximum amplitude of camera shake exceeds the camera shake compensable range R of the image shake prevention device (first
In Fig. 7), TA is the time from when the amplitude reaches τ until reaching the upper limit of the camera shake compensable range, and the time TA is calculated from the output of the camera shake detection means 1B and 19 (Fig. 1).
The optimum exposure is determined by calculating the time T^ as a reference value for determining whether camera shake compensation is possible. As shown in FIG. 18, when the maximum amplitude of camera shake is within the camera shake compensation range of the image stabilization device, the value of TA becomes TA=(1), and the maximum amplitude of camera shake is within the range that can be compensated for by the image stabilization device. When it is significantly larger than the upper limit of the range, the slope of the camera shake curve becomes extremely steep, resulting in TA40.

The operation of the first embodiment of the exposure mode determining means installed in the camera of the present invention will be described below with reference to Table 1 and the flowchart of FIG.

When the camera user lightly presses the shutter release button (not shown) when taking a picture, the switch 5W-1 is turned on.
According to this ON signal, the photometry circuit 26 (Fig. 6) operates to perform photometry, and the shutter speed TV corresponding to the photometry value is adjusted.
(shutter opening/closing time) is determined. Next, the distance measuring circuit 27 (FIG. 6) operates to measure the distance, and the measured distance value λ is determined. Furthermore, the camera shake detection means 18
and 19 (FIG. 6) are operated to detect camera shake, and the value TA is calculated by a circuit (not shown). Then, it is determined whether TV≦TA with respect to the values of TV and TA, and if Tv≦TA, outdoor light photography AE (shutter opening/closing time, that is, outdoor light photography determined based on shutter speed or photometry value) is performed. It is selected and waits for the second stroke operation of the shutter release button (wait for the switch 5W-2 (not shown) to be turned on). In this case, it is determined that camera shake compensation by the image stabilization device is possible (TV≦TA), so the image stabilization device operates to prevent image blur on the imaging plane. . That is, the camera shake compensation circuits 2o and 21 cause the coils 6 and 8 to have a predetermined value (camera shake detection means 18 and 19).
A current corresponding to the output of coil 6 is caused to flow, which causes coil 6 to
The lens holding frame 3 integrated with the lens holding frame 3 and 8 is pushed vertically or horizontally, and as a result, image blur on the imaging plane is suppressed. At this time, move the lens holding frame 3! (moving speed) is detected as the magnitude of the induced electromotive force generated in the coils 10 and 12.
The instantaneous position of the lens holding frame 3 is controlled by a servo system consisting of 1 and 1.

On the other hand, if TV > TA, it is determined that camera shake compensation by the image stabilization device is not possible, so flash photography is automatically selected regardless of the photometry results, and the shutter speed is also adjusted based on the photometry results. The previously determined value Tv is replaced by a specific second time T3 predetermined for strobe photography.

Next, a second embodiment of the exposure mode determining means installed in the camera of the present invention will be described with reference to Table 2 and FIG. 15. Note that in this embodiment as well, the process up to the stage of determining whether camera shake compensation is impossible based on the value of TA is the same as in the previous embodiment, so the explanation of the operation up to this stage will be omitted. do.

Compared to the exposure mode determination method shown in Table 1, the exposure mode determination method shown in Table 2 uses the strobe light reaching distance of 2GN/F and the distance measurement result (subject pressure m>fl) to determine the mode. 14. Therefore, the program flowchart for determining the exposure mode also has a flow that is partially different from that shown in Fig. 14. In the flowchart of
When it is determined that the camera shake is outside the "camera shake compensation range °'" of the image blur prevention device, the subject distance is greater than the strobe light reach distance 2GN/F and the temperature is almost infinite. Only at certain times, external light 11!Shadow is selected instead of flash photography.

The flowchart shown in FIG. 16 is a flowchart of the exposure mode determination method shown in Table 3, and this flowchart is configured by adding an exposure mode determination flow when using a self-timer to the flowchart shown in FIG. 15. . Therefore, in the explanation of the flowchart of FIG. 16, only the flow on the right side of the figure will be explained.

When taking pictures with the self-timer attached to the camera of the present invention, turn on the self-timer switch 5W-3.
Then, similarly to the above, photometry, distance measurement, and camera shake are detected in this order, and the Tv, It, and T
After A is determined, it is determined whether camera shake compensation is possible by comparing Tv and TA. When camera shake compensation is not possible (D > TA), strobe photography is selected, and in that case the shutter speed is not a value based on the photometry results, but a specific second time Ts suitable for strobe photography. .

On the other hand, if TV≦TA, the “shutter opening/closing time TB at which there is a risk of subject blurring” is further compared with the TV, and if TV≦T8, it is determined that camera shake compensation is possible, and then the camera shake compensation is possible. Start the timer counting.

[Effects of the Invention] In the camera of the present invention, the correction optical system of the image stabilization device is cantilever-supported by at least three flexible support rods parallel to the optical axis, so that a complicated sliding mechanism is not required. There is no need for a complicated and expensive drive mechanism, and therefore, according to the present invention, it is possible to provide a camera with an image stabilization device that is lightweight, compact, and can be manufactured at a relatively low cost. In particular, a practical compact camera with an image stabilization device can be realized.

Note that in the embodiment shown above, the lens holding frame 3, the actuator, and the lens holding frame movement amount detection means are configured as separate parts, but the lens holding frame 3 itself is the movable part of the actuator and the detection means. Of course, it may also be configured to serve as both.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a main part of the first embodiment of the camera of the present invention, FIG. 2 is a schematic vertical cross-sectional view of a part of the structure shown in FIG. 1, and FIG. 3 is the same as shown in FIG. A diagram showing one state of the structure (a state during camera shake compensation operation), FIG. 4 is a diagram showing the positional relationship between the support rod 4 and the aperture 1a in the structure shown in FIG. 1, and FIG. FIG. 6 is a schematic longitudinal cross-sectional view of a part of the structure shown in the figure, FIG. FIG. 8 is an enlarged perspective view for explaining a part of the structure shown in FIG. 7, and FIG. 9 is a perspective view showing the main parts of a second embodiment of the camera of the invention. A front view of a part of the structure, FIG. 10 is a perspective view of main parts and an electrical connection diagram of a third embodiment of the camera of the present invention, and FIG. 11 is a perspective view of main parts and an electrical connection diagram of a fourth embodiment of the present invention. Figure 12 (a) and (
b) is a perspective view and a schematic front view of the main parts of the fifth embodiment of the present invention, FIGS. 13(a) and (b) are schematic diagrams of the sixth embodiment of the present invention, and FIGS. 14 to 16 are Flowcharts showing the operation of the exposure mode determining means installed in the camera of the present invention, FIGS. 17 and 18 are used to explain one of the symbols used in the flowcharts of FIGS. 14 to 16. Figures 19 [7S to 25 are diagrams for explaining the relationship between camera shake and image shake on the imaging plane,
It is. 1 - Camera body 2... Lens 3 (of the correction optical system) - Lens holding frame 4... Support rod 5, F...
Yoke 6.8 (of the actuator) Coil 18.19 (of the actuator) Camera shake detection means 22.23 Position detection sensor 24 Light emitting element 20.21 ...Camera shake compensation circuit 26...Photometry circuit 27...Distance measurement circuit and 4 others Fig. 5 Fig. 13(b) Fig. 15 Fig. 20 Fig. 21

Claims (1)

[Claims] 1. In a camera incorporating a correction optical system that is moved to prevent image blurring on the imaging plane when camera shake occurs, the correction optical system is configured to move along the photographing optical axis. 1. A camera having a structure supported in a cantilevered manner by at least three flexible support rods of equal length extending parallel to the camera.