JP2000010139A - Image shake correcting camera and image shake correcting method for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image shake correcting camera by which the restriction is less from the viewpoint of designing a lens and a lens barrel and to provide an image shake correcting method for a camera. SOLUTION: This camera having a camera main body and a photographing lens which forms an image on a focal surface inside the camera main body is provided with a movable mirror 14 on an optical path inside the camera main body, a sensor detecting the magnitude and the direction of a shake given to the camera and a mirror two-direction driving mechanism 20 driving the mirror 14 so that an image position on the focal surface is moved in the vertical and the right and left directions of the image in accordance with the magnitude and the direction of the shake detected by the sensor. This image shake correcting method of the camera having the camera main body and the photographing lens forming the image on the focal surface of the camera main body corrects the image shake in the vertical and the right and left directions caused by the shake given to the camera by the driving of the movable mirror which can be driven in the two directions and installed on the optical path between the photographing lens inside the camera main body and the focal surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera capable of correcting an image shake caused by a shake applied to the camera, and a method of correcting an image shake of the camera.

[0002]

2. Description of the Related Art In an image blur correction mechanism of an optical apparatus, a type for controlling a prism angle of a variable apex angle prism provided in an optical system or a part or all of a lens in a plane direction orthogonal to an optical axis is used. Something to move to has been proposed. When such an image blur correction mechanism of a conventional optical device is applied to a camera, an optical member for blur correction and a drive mechanism for correction are provided in the lens barrel, so that the lens barrel is prevented from being enlarged. I can't. In addition, if an image blur correction mechanism is provided in the lens barrel, the shutter mechanism, zoom mechanism, lens configuration, and the like are often restricted. In particular, in an interchangeable lens camera, arranging the image blur correction mechanism in the lens barrel is disadvantageous in terms of the size and cost of the lens.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an image stabilizing camera and a camera image stabilizing method with less restrictions on the design of lenses and lens barrels.

[0004]

SUMMARY OF THE INVENTION An image blur correction camera according to the present invention is a camera having a camera body and a photographing lens for forming an image on a focal plane in the camera body, wherein a movable mirror is provided on an optical path in the camera body. A sensor for detecting the magnitude and direction of the shake applied to the movable mirror according to the magnitude and direction of the shake detected by the sensor, the image position on the focal plane is moved in the vertical and horizontal directions of the image. And a mirror two-way driving mechanism for driving in two directions as described above.

The two-way mirror drive mechanism supports the movable mirror so as to be rotatable about a rotation center parallel to the optical axis of the incident light beam, and moves the movable mirror straight in a direction parallel to the optical axis of the incident light beam. It can be configured to include a supporting mechanism that supports the camera as much as possible, and a pair of actuators that cause the movable mirror to perform the rotation and the linear movement according to the magnitude and direction of the shake applied to the camera.

The two-way mirror drive mechanism can rotate the movable mirror about a center of rotation parallel to the optical axis of the incident light beam and a center of rotation orthogonal to a plane including the optical axes of the incident light beam and the reflected light beam. And a pair of actuators for rotating the movable mirror about the two rotation centers according to the magnitude and direction of the shake applied to the camera. is there.

In the above image blur correcting camera, mirror position detecting means for detecting an initial position and a driving position of the movable mirror in two directions, an automatic focusing mechanism for performing a focusing operation according to a subject distance, and the mirror position Feedback means for feeding back the driving direction and the driving amount of the movable mirror from the initial position in two directions obtained by the detecting means to the automatic focusing mechanism, wherein the automatic focusing mechanism is a camera generated by driving the movable mirror. It is desirable to correct the change in the optical path length in the main body in the focusing operation.

The present invention also relates to a method for controlling an image shake correcting camera, and in a camera having a camera body and a taking lens for forming an image on a focal plane of the camera body, a vertical image shake caused by a shake applied to the camera. And image blur in the horizontal direction are corrected by driving a movable mirror that can be driven in two directions and is disposed on an optical path between a photographing lens and a focal plane in the camera body.

[0009]

FIG. 1 shows an embodiment of an optical system of an image blur correction camera according to the present invention. Camera 10
Consists of a lens barrel 11 and a camera body 13,
A photographing lens 12 is provided in the lens barrel 11.
In a camera body 13 behind the photographing lens 12, a planar movable mirror 14 that reflects a light beam from the photographing lens 12 substantially vertically upward in the camera body 13 in an initial state (non-driving state). Is installed. The light beam reflected by the movable mirror 14 is
Is imaged on a film 16 (focal plane) passing above the image.
That is, the photographing optical system of the camera 10 has an optical axis OT from the photographing lens 12 to the movable mirror 14 and an optical axis OM from the movable mirror 14 to the film plane (focal plane).
And the optical axis OM are orthogonal to each other.

In the camera body 13, a film cartridge storage chamber (not shown) and a film winding spool chamber (not shown) are provided at left and right positions sandwiching the focal plane, respectively, and the film is sent out from the film cartridge and wound on a winding spool. In 16, the photographing screen 17 passes on the focal plane of the photographing optical system. As is clear from FIG. 1, in the camera 10 of the present embodiment, the vertical direction of the horizontally long shooting screen 17 does not coincide with the vertical direction of the camera 10, and the vertical direction (short side direction) of the shooting screen 17 is indicated by x. And the left-right direction (long side direction) is indicated by y. When the photographing lens 12 is displaced in the vertical direction and optical axis blur occurs, image shake in the vertical direction (x direction) of the photographing screen 17 occurs on the film surface (focal plane), and the photographing lens 12 moves in the horizontal direction. In the case of displacement, image shake occurs in the left-right direction (y-direction) of the photographing screen 17 on the film plane (focal plane). In the present embodiment, the present invention is described based on a camera using a silver halide film such as the film 16, but the camera of the present invention is not limited to this, An electronic still camera or the like in which an image sensor is arranged at a surface position may be used.

The movable mirror 14 is supported movably in two directions by a mirror driving mechanism 20 shown in FIG.
The movable mirror 14 is supported by the support frame 21 at an angle that reflects the optical axis OT of the photographing lens 12 at right angles.
1 is fixed. In the lower part of the support frame 21,
A gear portion 22 having a gear surface is formed on a cylindrical surface centered on the optical axis OT, and a pair of four follower pins 23 project from the gear portion 22 before and after in the optical axis OT direction. Each follower pin 23 is arranged such that its axis is located on an arc of the same diameter centered on the optical axis OT. In FIG. 2, only the front two follower pins 23 are shown.

A pair of support legs 25 project from the linearly moving plate 24 so as to sandwich the gear portion 22 therebetween. A rotation guide cam groove 26 that forms a part of an arc centered on the optical axis OT is formed on a surface of each support leg 25 that faces the gear portion 22. A pair of front and rear follower pins 23 are fitted. In FIG. 2, the optical axis OT
The rotation guide cam groove (26) of the support leg 25 located rearward in the direction is not shown, but is not shown.
Similarly, a pair of follower pins (23) projecting rearward from the gear portion 22 are fitted. The pair of follower pins 23 is guided in the front and rear rotation guide cam grooves 26, so that the support frame 21 of the movable mirror 14 rotates about the optical axis OT with respect to the rectilinear moving plate 24. can do.

A rotary pulse motor 27 for rotating the support frame 21 is provided on the rectilinear moving plate 24. The output shaft of the rotation pulse motor 27 is
, And the pinion 28 meshes with the gear surface of the gear portion 22. Therefore, when the rotation pulse motor 27 is driven, the support frame 21, that is, the movable mirror 14 can be rotated about the optical axis OT.

An index 29 is provided on the support frame 21. By detecting the index 29 with a rotation position detection sensor 30, the initial rotation position of the movable mirror 14 (support frame 21) can be detected. . As will be described later, the amount and direction of rotation of the movable mirror 14 (support frame 21) about the optical axis OT at the time of image blurring are determined by the CPU 4.
A value of 0 is calculated as the number of drive pulses of the rotation pulse motor 27, and a drive signal including the number of drive pulses is supplied from the image blur correction motor driver 43 to the rotation pulse motor 27. Therefore, the drive position (rotation amount and rotation direction) of the movable mirror 14 from the initial angular position can be obtained by referring to the number of drive pulses included in the drive signal supplied to the rotation pulse motor 27.

A screw hole 31 is formed in the rectilinear moving plate 24 along the optical axis O.
The drive shaft 33 of the linear motor 32 is inserted into the screw hole 31. A male screw that meshes with the screw hole 31 is formed on the outer peripheral surface of the drive shaft 33. A guide hole 34 parallel to the optical axis OT is formed in the rectilinear moving plate 24, and a guide shaft 35 fixed in the camera body 13 and parallel to the optical axis OT slides in the guide hole 34. Penetrates movably. With this structure, when the linear pulse motor 32 is driven, a moving force is applied to the linear moving plate 24 via the male screw of the drive shaft 33 and the screw hole 31, and the guide hole 34 is guided by the guide shaft 35,
The rectilinear moving plate 24 moves back and forth in parallel with the optical axis OT. That is, the movable mirror 14 is moved straight in the optical axis OT direction.

An index 36 is provided on the rectilinear moving plate 24. By detecting the index 36 by a rectilinear moving position detecting sensor 37, the optical axis OT of the movable mirror 14 is detected.
An initial position in the direction can be detected. As will be described later, the driving amount and the driving direction of the movable mirror 14 (the rectilinear moving plate 24) in the direction parallel to the optical axis OT at the time of image blur are calculated by the CPU 40 as the number of driving pulses of the pulse motor 32 for the rectilinear motion. A drive signal including the number of drive pulses is supplied from the image blur correction motor driver 43 to the straight-ahead pulse motor 32. Therefore, the drive position (drive amount and drive direction) of the movable mirror 14 from the initial position in the direction parallel to the optical axis OT refers to the number of drive pulses included in the drive signal supplied to the linear pulse motor 32. Can be obtained by:

In the mirror driving mechanism 20, the movable mirror 14 (the support frame 21) is moved by the optical axis O by the rotation pulse motor 27.
When rotated about T, the optical axis OM is deflected as shown in FIG. 3, and the image position on the film surface (or the imaging surface of the imaging device) is shifted in the left-right direction (y direction) of the shooting screen 17. Move to. In the optical system of the present embodiment, when the movable mirror 14 is tilted to the right as viewed from the front of the camera, the image moves to the right of the shooting screen 17, and when the movable mirror 14 is tilted to the left, the image moves to the left of the shooting screen 17. Moving.

On the other hand, when the rectilinear moving plate 24 is driven back and forth in the optical axis OT direction by the rectilinear pulse motor 32, the optical axis OM is moved in parallel in the front and rear direction of the camera body 13 as shown in FIG. Alternatively, the image position on the imaging surface moves in the vertical direction (x direction) of the imaging screen 17. In the optical system of the present embodiment, when the movable mirror 14 is driven forward, an image moves above the shooting screen 17, and when the movable mirror 14 is driven backward, the image moves below the shooting screen 17.

Therefore, if the mirror driving mechanism 20 is drive-controlled to cause the movable mirror 14 to perform the linear movement along the optical axis OT and the turning operation about the optical axis OT as appropriate, the camera shake can be prevented. It is possible to two-dimensionally correct the image blur by moving the image position on the film surface (or the imaging surface) in the x and y directions.

The control process of the image blur correction in the camera 10 will be described with reference to FIG. Camera body 1
In 3, a shake detection sensor 41 for detecting a moving angular velocity of the camera body 13 around two axes (vertical axis and horizontal axis of the camera) orthogonal to each other in a plane orthogonal to the optical axis OT of the taking lens 12 is provided. The magnitude and direction of the shake applied to the camera 10 are detected by the shake detection sensor 41.

As described above, by driving the movable mirror 14 in parallel with the optical axis OT, the image position moves in the up-down direction (x direction) of the photographing screen 17 and is rotated about the optical axis OT. Then, the horizontal direction (y direction) of the photographing screen 17
The image position moves to. Therefore, the CPU 40 obtains a moving angle by time-integrating the angular velocity of the biaxial shake detected by the shake detecting sensor 41, calculates the moving amount of the image in the x and y directions on the focal plane from the moving angle, and , This x, y
The amount of straight drive and the amount of rotation of the movable mirror 14 required to cancel the image shake in the direction are calculated. In the present embodiment, the movement angular velocity of the camera body and the mirror straight drive amount and the rotation amount (the number of drive pulses of each of the pulse motors 27 and 32) for performing shake correction are stored in the EEPROM 44 in advance as table data. It is remembered. Then, based on the table data, the CPU
40 obtains the amount of linear drive and rotation of the movable mirror 14 necessary for image blur correction, and the image blur correction motor driver 43 sends a drive signal to the pulse motor 27 for rotation and the pulse motor 32 for linear movement, Is controlled in two directions.
Thus, the movable mirror 14 performs an operation combining the two directions of rotation and linear movement to cancel the shake of the photographing optical axis, and the image position on the film surface (or the imaging surface) is kept constant. .

The camera 10 also has the following automatic focusing (AF) mechanism. A part of the taking lens 12
It is configured as an AF lens 45 movable in a direction parallel to the optical axis OT. The AF lens 45 is driven by an AF motor 46 to any one of a plurality of divided stage positions with different positions in the optical axis OT direction, and the movement position is detected by an AF lens position sensor 47. The camera 10 also has an AF sensor 48, and when the distance measuring switch 49 is operated, subject distance information can be obtained. As such an AF sensor, a type that measures a distance to a subject, a type that measures a defocus amount, and the like have been proposed. The distance measuring switch 49 can be configured to be turned on when the release button is half-pressed as in a general AF camera. Subject distance information obtained by the AF sensor 48 is input to the CPU 40. Based on the input value, the CPU 40 moves the AF lens 45 necessary for focusing on the film surface (or imaging surface) (AF lens). (The movement amount from the current movement position detected by the position sensor 47)
And sends a drive signal to the AF motor driver 50,
The AF motor 46 drives the AF lens 45 to a position of a desired number of divisions, whereby a focusing operation is performed. The automatic focusing mechanism as described above is well known.

As shown in FIG. 3, when the movable mirror 14 is at the initial angle position shown by the solid line, the optical path length from the rear end of the taking lens 12 to the film surface is the shortest. When the movable mirror 14 is rotated from the initial angular position indicated by the solid line to the position indicated by the two-dot chain line in order to correct the image shake of α1 in the y direction, the optical path length becomes longer by the deflection. As shown in FIG. 4, when the movable mirror 14 is driven straight forward by α2 from the initial position indicated by the solid line to the position indicated by the two-dot chain line in order to correct the image blur in the x direction, the optical path length becomes Becomes longer by the drive amount α2. That is, when the movable mirror 14 is rotated or driven straight ahead to perform image blur correction, the optical path length changes and the focus is deviated. In the camera of the present embodiment, the focusing operation is performed in consideration of the change in the optical path length accompanying the driving of the movable mirror 14.

In the EEPROM 44, in addition to the table data of the movement angular velocity of the camera body, the mirror straight drive amount, and the rotation amount, an AF correction value for correcting an optical path length change caused by the driving of the movable mirror 14 is stored. Stored as table data. As described above, the straight drive amount and the rotation amount from the initial position of the movable mirror 14 can be obtained by referring to the number of drive pulses included in the drive signals supplied to the rotation pulse motor 27 and the straight movement pulse motor 32. The CPU 40 refers to the table data in the EEPROM 44 from the driving data of the movable mirror 14 and obtains an AF correction value corresponding to the driving position of the movable mirror 14 in two directions. This AF correction value is the AF value based on the subject distance information.
In consideration of the lens driving amount of the
The drive signal of the F lens 45 is supplied to the AF motor driver 50. In determining the movement position of the AF lens 45, the current position data of the AF lens 45 detected by the AF lens position sensor 47 is also fed back, and the movement from the current position to the AF motor 46 is sent from the AF motor driver 50 to the AF motor 46. A drive signal is sent. Then, during the focusing operation, the AF lens 45 is driven to the moving position determined through the above control. By controlling as described above, even if the movable mirror 14 is driven in two directions and the optical path length changes, the focal plane does not move back and forth and coincides with the film plane (or the imaging plane), and the image is taken in the in-focus state. It can be performed. In the figure, the movable mirror 14 is driven rearward in a direction parallel to the optical axis OT, and is tilted rightward when viewed from the front of the camera. However, similar focus adjustment is possible when each of the mirrors is driven in the opposite direction. Needless to say,

FIG. 6 shows a different form of the driving mechanism for driving the movable mirror in two directions. Elements similar to those in the previous embodiment are denoted by the same reference numerals. In this mirror driving mechanism 20 ', the movable mirror 14' is rotatably supported about the optical axis OT by the same mechanism as in FIG. The image position is displaced in the y direction on the (or imaging surface). The movable mirror 14 ′ also rotates about the rotation axis 51 that is orthogonal to a plane including the optical axis OT and the optical axis OM and that axis passes through the intersection of the optical axes OT and OM with respect to the support frame 21 ′. It is movably supported.

A worm wheel 52 is formed around the rotation shaft 51 around the rotation shaft 51. A rotation pulse motor 53 is supported on the support frame 21 ′, and a worm gear 54 provided on an output shaft of the rotation pulse motor 53 meshes with the worm wheel 52. Then, when the rotation pulse motor 53 is started to rotate the worm gear 54, the rotational force is orthogonally transformed, and the movable mirror 14 '
1 is rotated. The rotational position of the movable mirror 14 ′ that reflects the incident light beam at a substantially right angle is the initial angular position in the rotational direction, and the rotational position detection sensor 56 detects the index 55 provided on the worm wheel 52. , This initial angular position can be detected. The rotation amount of the movable mirror 14 ′ about the rotation axis 51 is calculated by the CPU 40 as the number of drive pulses of the rotation pulse motor 53, and a drive signal including the number of drive pulses is converted into an image blur correction motor driver. 43 supplies the rotation pulse motor 53. Therefore, the rotation position (rotation amount) of the movable mirror 14 ′ from the initial position about the rotation shaft 51.
Can be obtained by referring to the number of drive pulses included in the drive signal supplied to the rotation pulse motor 53.

As shown in FIG. 7, when the movable mirror 14 'rotates about the rotation shaft 51 and the reflection angle changes, the reflected light beam is deflected in the x direction. As a result, the image position on the film surface (or the imaging surface) is displaced in the vertical direction (x direction) of the photographing screen 17. In other words, instead of the linear drive in the direction parallel to the optical axis OT in the drive mode of FIG.
The image blur correction in the x direction can also be performed by rotating the movable mirror 14 'with a rotation axis 51 orthogonal to a plane including T and the optical axis OM. Therefore, using the motors 27 and 53,
By appropriately rotating the mirror 14 'about two axes orthogonal to each other, image blur correction can be performed two-dimensionally on the focal plane. The image shake control using the movable mirror 14 ′ can be performed in the same manner as in the case of the movable mirror 14, and the rotation shaft 51 for correcting the vertical image shake among the shakes applied to the camera. Movable mirror 1 centered on
The amount of rotation of 4 ′ and the amount of rotation of movable mirror 14 ′ about optical axis OT for correcting image shake in the left and right directions are calculated, and pulse motors 27 and 53 for rotation are calculated based on the calculated amounts.
May be drive-controlled.

Also in this mirror driving mechanism 20 ', the optical path length changes when the movable mirror 14' is rotated in each direction. Therefore, an AF correction value is obtained from the rotation direction and the rotation amount of the movable mirror 14 'with respect to each rotation axis, and the AF correction value is fed back to the automatic focusing mechanism to correct a change in the optical path length due to mirror driving in the focusing operation. It is desirable. Since the focus adjustment has been described above, a detailed description thereof will be omitted.

As described above, in the present invention, since the shake applied to the camera is corrected by driving one movable mirror provided in the camera body in two directions, the image blur correction for the image shake is provided in the lens barrel. Since no optical member is required, an increase in the size of the lens barrel is avoided, and restrictions on the design of the lens barrel are reduced. Further, two-dimensional image blur correction can be performed by one movable mirror, so that the configuration is excellent in space efficiency.

However, the present invention is not limited to the above embodiment. For example, the mechanism for rotating the movable mirror may be a known mechanism other than the cam guide type or the worm type, and the mechanism for linearly driving the movable mirror may be a linear actuator other than a screw screw drive shaft. May be. Further, as described above, the present invention can be applied not only to a camera using a silver halide film, but also to an electronic still camera or the like in which an imaging element is arranged at a focal position.

Further, in the embodiment, the automatic focusing mechanism is configured to move the focusing lens which constitutes a part of the photographing lens. It is also possible to use an automatic focusing mechanism of a type that performs a focusing operation by performing a parallel movement in a direction perpendicular to the surface (i.

[0032]

As described above, according to the present invention, it is not necessary to provide an image blur correction mechanism in the lens barrel, so that there are few restrictions on the design of the lens and the lens barrel. An image blur correction method can be provided. In particular, since two-dimensional image blur correction can be performed by one movable mirror, the size and weight of the camera body can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of an optical system of an image blur correction camera according to the present invention.

FIG. 2 shows a movable mirror arranged in the camera body of FIG. 1;
FIG. 9 is a perspective view of a two-way mirror drive mechanism for rotating about a rotation center parallel to the optical axis of the incident light beam and for driving the mirror straight ahead parallel to the optical axis of the incident light beam.

FIG. 3 is a front view showing a change in an optical path when a movable mirror is rotated by the drive mechanism of FIG. 2, as viewed from the direction of arrow III in FIG. 1;

FIG. 4 is a side view showing a change in an optical path when a movable mirror is driven in a straight line by the drive mechanism of FIG. 2, as viewed from the direction of arrow IV in FIG. 1;

FIG. 5 is a block diagram illustrating a control system of the image shake correction camera of FIG. 1;

FIG. 6 shows a movable mirror arranged in the camera body of FIG.
FIG. 4 is a perspective view of a two-way mirror drive mechanism for rotating about a rotation center parallel to the optical axis of the incident light beam and about a rotation center orthogonal to a plane including the optical axes of the incident light beam and the reflected light beam. .

FIG. 7 is a view showing a change in an optical path when the movable mirror is rotated by the drive mechanism of FIG. 6 about a rotation center orthogonal to a plane including the optical axes of the incident light beam and the reflected light beam, as viewed from the direction VII in FIG. FIG.

[Explanation of symbols]

 OT OM Optical axis 10 Camera 11 Lens barrel 12 Photographing lens 13 Camera body 14 14 'Movable mirror 16 Film 17 Photographing screen 20 20' Mirror drive mechanism 21 21 'Support frame 22 Gear part 23 Follower pin 24 Straight moving plate 25 Support leg 26 Rotating guide cam groove 27 53 Rotating pulse motor 30 56 Rotating position detecting sensor 32 Linear driving pulse motor 34 Guide hole 35 Guide shaft 40 CPU 41 Shake detecting sensor 43 Image shake correcting motor driver 51 Rotating shaft 52 Worm wheel 54 Worm gear

Claims (5)

[Claims] 1. A camera having a camera body and a photographing lens for forming an image on a focal plane in the camera body, wherein a movable mirror is provided on an optical path in the camera body to detect a magnitude and a direction of a shake applied to the camera. A mirror that drives the movable mirror in two directions such that the image position on the focal plane is moved in the vertical and horizontal directions of the image in accordance with the magnitude and direction of the shake detected by the sensor. An image shake correction camera, comprising: a two-way drive mechanism. 2. The image stabilizing camera according to claim 1, wherein the mirror two-way driving mechanism rotatably supports the movable mirror about a rotation center parallel to an optical axis of an incident light beam. A support mechanism that supports the mirror so as to be able to move straight in a direction parallel to the optical axis of the incident light beam; and a pair of actuators that cause the movable mirror to perform the rotation and the straight movement according to the magnitude and direction of the shake applied to the camera. , An image stabilization camera. 3. The image blur correction camera according to claim 1, wherein the mirror two-way driving mechanism comprises: a movable center for rotating the movable mirror parallel to an optical axis of the incident light beam; and an optical axis for the incident light beam and the reflected light beam. A two-axis rotation support mechanism that rotatably supports a rotation center orthogonal to a plane including a plane, and a pair that rotates the movable mirror about the two rotation centers according to the magnitude and direction of the shake applied to the camera. An image blur correction camera comprising: an actuator; 4. The image blur correction camera according to claim 1, wherein a mirror position detecting means for detecting an initial position and a driving position of the movable mirror in two directions, and a focusing operation according to a subject distance. And a feedback unit that feeds back the driving direction and the driving amount of the movable mirror from the initial position in two directions obtained by the mirror position detecting unit to the automatic focusing mechanism. The focusing mechanism is an image shake correction camera that corrects a change in an optical path length in the camera body caused by driving the movable mirror in a focusing operation. 5. A camera having a camera body and a photographing lens for forming an image on a focal plane of the camera body, wherein a vertical image shake and a horizontal image shake caused by a shake applied to the camera are photographed in the camera body. An image blur correction method for a camera, wherein the correction is performed by driving a movable mirror, which can be driven in two directions, provided on an optical path between a lens and a focal plane.