JPH09269520A - Image blurring correcting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a device by storing a shake detecting means and an actuator in a small space formed by dividing an annular space in a circumferential direction and forming a shake correction unit. SOLUTION: Two shake detecting sensors 39p and 39y for detecting a camera shake at photographing are provided, and also, two pairs of coils 37p and 37y and permanent magnets 38p and 38y are provided so as to drive a 2nd lens group 31 in two directions, and the coils 37p and 37y and an IRED 46 are soldered and connected on a sensor substrate 40 through a power supply wire. Besides, the external projection shape of the shake correction unit is circular in the optical axial direction, but, the center of the unit is occupied by the 2nd lens group 31, so that mechanical parts for supporting and driving the 2nd lens group 31 are scatteringly arranged in the annular space, keeping away from the 2nd lens group 31. And the pitch and yaw image blurring correcting actuator is composed of the permanent magnet 38 and the coil 37, and about 1/4 of the annular space is occupied by the pair of actuators.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an image blur correction device for suppressing image blur caused by a shake of a camera or the like.

[0002]

2. Description of the Related Art Conventionally, camera shake generated in a camera or the like is detected by a shake detection sensor such as a vibration gyro, and based on the result, a shake correction optical system is driven to suppress image shake on an image plane. Proposals have already been made.

Here, in order to realize a compact and high-performance image shake correction apparatus, 1) the shake correction optical mechanism and the shake detection sensor are efficiently arranged to reduce the size of the entire apparatus.

2) It is possible to prevent the shake detection sensor from generating an erroneous output due to harmful vibration generated from a mechanical portion such as a shutter of a camera. That point must be satisfied.

In view of this point, Japanese Patent Laid-Open No. 7-1598
An image blur correction device according to No. 34 has been proposed. This is because a shake correction sensor is integrally attached to a shake correction unit in which a lens unit driven eccentrically and an actuator for driving the lens unit are integrated,
The device is being downsized.

Further, in Japanese Unexamined Patent Publication No. 6-332026, the shake detection sensor and the lens barrel drive motor are arranged in opposite directions with the lens barrel interposed therebetween to prevent erroneous output of the shake detection sensor due to motor noise.

On the other hand, in Japanese Patent Application No. 6-83588, the shake detection sensor is loaded into the hermetically sealed case via an elastic member, so that the shake detection sensor is erroneously output due to harmful vibration or sound emitted from a camera shutter or the like. Is being prevented.

[0008]

However, in the proposed device of Japanese Patent Laid-Open No. 7-159834 mentioned above, since the shake detection sensor is attached to the outside of the shake correction unit, the effect of downsizing the entire device is insufficient. Is.

Further, in the proposed device of Japanese Patent Laid-Open No. 6-332026, since the shake detection sensor is arranged outside the lens barrel, the device becomes large.

On the other hand, in the proposed device of Japanese Patent Application No. 6-83588, since the whole shake detection sensor is covered with the hermetically sealed case, the size of the device also becomes large.

(Object of the Invention) A first object of the present invention is to provide an image blur correction device capable of achieving miniaturization.

A second object of the present invention is to use a different optical system.
In the one that detects the shake in the direction and corrects the image shake,
An object of the present invention is to provide an image blur correction device that can achieve miniaturization.

A third object of the present invention is to provide an image blur correction device in which an actuator for driving an image blur correction optical member can be miniaturized and arranged so that the efficiency of shake detection by the shake detection means is improved. That is.

A fourth object of the present invention is to perform image blur correction in which an actuator for driving a blur detecting means and an image blur correcting optical member can be compactly housed in an optical group which moves forward and backward in the optical axis direction by a zoom operation. It is to provide a device.

A fifth object of the present invention is to provide an image blur correction device which can achieve miniaturization in an image blur correction by a lens group having a predetermined power.

A sixth object of the present invention is to provide an image blur correction device which can achieve miniaturization in the image blur correction by the variable apex angle prism.

A seventh object of the present invention is to provide an image blur correction apparatus capable of preventing the output error of the blur detection means due to the impact of the shutter of the single-lens reflex camera and reducing the size of the entire apparatus. is there.

An eighth object of the present invention is to provide an image blur correction device capable of preventing the output error of the blur detection means due to the impact of the shutter of the lens shutter camera and reducing the size of the entire device. is there.

A ninth object of the present invention is to prevent the output error of the shake detecting means due to the impact of the aperture of the camera, and
An object of the present invention is to provide an image blur correction device capable of downsizing the entire device.

[0020]

In order to achieve the first object, the present invention according to claim 1 is an optical system for forming an image of a subject, and a shake for detecting shake generated in the optical system. Based on an output of the detection unit, an image blur correction optical member that forms a part of the optical system and is displaced within a predetermined movable range to prevent image blur due to the blur, and the shake detection unit. In an image blur correction device including an actuator for driving the image blur correction optical member, the image blur correction optical member has a substantially annular space on the outer periphery thereof, and in the annular space, The shake detecting means and the actuator are arranged so that the shake detecting means and the actuator are arranged in a substantially annular space surrounding the image shake correcting optical member, more specifically, in a small space obtained by dividing the annular space in the circumferential direction. To store the It is a configuration that a unit.

In order to achieve the second object,
According to a second aspect of the present invention, the shake detecting means for detecting shake generated in the optical system for image formation is constituted by two sets of shake detecting means for detecting shake in two different directions of the optical system, and shake The actuator for driving the correction optical member is composed of two sets of actuators for driving the shake correction optical member in two different directions, and a more detailed description will be given to the substantially annular space surrounding the image shake correction optical member. Two shake detection means and two actuators are arranged in each small space obtained by dividing the annular space into four equal parts.

In order to achieve the third object,
According to a third aspect of the present invention, there are provided two sets of actuators for driving two sets of image-shake correction optical members, which drive the shake-correction optical member optical members in two different directions.
Each is composed of a permanent magnet and a coil, and one set of actuators is housed in one of the four divided small spaces.

In order to achieve the fourth object,
According to a fourth aspect of the present invention, the optical system for forming the image of the subject is a zoom optical system, and the image blur correction optical member is moved back and forth in the optical axis direction by the zoom operation, and is moved back and forth in the optical axis direction. The configuration is such that the shake detecting means and the actuator for driving the shake correcting optical member are housed in one optical group.

In order to achieve the fifth object,
In the present invention according to claim 5, the image blur correcting optical member is a lens group having a predetermined power capable of moving in two different directions within a plane orthogonal to the optical axis, and has a predetermined movable power. A structure in which a shake detecting unit and an actuator for driving the image shake correcting optical member are arranged around the lens group.

In order to achieve the sixth object,
According to a sixth aspect of the present invention, the image blur correcting optical member is a variable vertical angle prism that refracts a light beam passing through the image forming optical system in two different directions, and the variable vertical angle prism is provided around the variable vertical angle prism.
An actuator for driving the shake detecting means and the image shake correcting optical member is arranged.

In order to achieve the seventh object,
The present invention according to claim 7 is applied to a single-lens reflex camera having a focal-plane shutter, and an image forming optical system includes a plurality of lens groups including shake correction optical members that move independently of each other during zooming. At
One of the independent lens groups is disposed between the image blur correction optical member and the focal plane shutter, and the focal plane is controlled by the independent lens group disposed between the image blur correction optical member and the focal plane shutter. The configuration is such that the impulse during the shutter operation is prevented from being transmitted to the shake detecting means.

In order to achieve the above eighth object,
The present invention according to claim 8 is applied to a camera having a lens shutter, wherein the image forming optical system includes a plurality of lens groups including shake correcting optical members that move independently of each other during zooming. A lens shutter is installed in one of the independent lens groups different from the shake correction optical member, and the shock during the lens shutter operation becomes shake detection means by the independent lens group different from the image shake correction optical member. I try to prevent it from being transmitted.

In order to achieve the above ninth object,
The present invention according to claim 9 is applied to a camera having a light amount adjusting diaphragm, wherein the image forming optical system includes a plurality of lens groups including shake correction optical members that move independently of each other during zooming. The light amount adjusting diaphragm is installed in one of the independent lens groups different from the shake correcting optical member, and an independent lens group different from the image shake correcting optical member prevents shock during operation of the light amount adjusting diaphragm. The transmission to the shake detecting means is prevented.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is a sectional view showing a main part of a single-lens reflex camera equipped with an image blur correction device according to a first embodiment of the present invention. The single-lens reflex camera is a camera body 101.
And an interchangeable lens 1 having a shake correction function.

The camera body 101 includes a film 102,
It has a focal plane shutter 103, a quick return mirror 104, and a finder optical system 105.
Reference numeral 106 is a camera-side mount for mounting a lens, 107 is a camera CPU for controlling the operation of the entire camera, 108 is various switch groups, and 109 is a contact group for supplying and communicating with the interchangeable lens 1. A focus detection unit 110 detects the focus state of the film surface.

The interchangeable lens 1 is a fixed cylinder 1 which is the basis of the interchangeable lens 1.
The lens side mount 12 is fixed to the camera body 1, and the camera body 1
It is attached to 01. Reference numeral 13 is a cam barrel for zooming a plurality of lens groups, which will be described later, and 14 is a zoom operation ring for rotating the cam barrel 13 via a key 15.

Reference numeral 21 denotes a first lens group, which is a focus lens barrel 2
2 is held. 22a near the rear end of the focus lens barrel 22
Is a helicoid female screw for extending the focus, and is screwed with the helicoid male screw 11a of the fixed barrel 11.

Reference numeral 23 is a focus actuator unit including a DC motor or ultrasonic motor and a reduction gear train. The output gear 23a is the internal gear 2 of the focus lens barrel 22.
Mesh with 2b. Therefore, when the drive of the unit 23 is transmitted to the gear 22b through the gear 23a and the focus lens barrel 22 rotates, the helicoid screws 22a and 11a cause the first lens group 21 to move back and forth in the optical axis direction to perform a focusing operation. Is done.

Reference numeral 31 is a second lens group for image blur correction, and the second lens group 31 is held by a lens frame 32 and fixed by a retaining ring 33. Reference numeral 34 denotes a second group support, which mounts various members for controlling the movement of the second lens group 31 within a plane orthogonal to the optical axis. 35
Is a light-shielding plate made of metal, and 36 is an L-shaped guide shaft that restricts rotation of the second lens group 31 around the optical axis. Protrusions 32a and 32b are provided on the object side and the image side of the lens frame 32, and the object side end surface of the support 34 and the image side end surface of the light shielding plate 35 are brought into sliding contact with each other, so that the lens frame 32 is orthogonal to the optical axis. It is possible to move in a plane parallel to the film plane, that is, in a plane parallel to the film plane.

37 is a drive coil fixedly mounted on the lens frame 32, and 38 is a permanent magnet that forms a fixed magnetic field. When the coil 37 is energized, it is in a direction orthogonal to the optical axis, that is, parallel to the plane of FIG. Thrust is generated vertically.

Reference numeral 39 denotes a shake detection sensor such as a vibration gyro, which is soldered to the sensor substrate 40 and fixed to the support base 34 with double-sided tape through an elastic member 41 such as a foam urethane sheet. Reference numeral 42 denotes a connector, which uses the flexible printed circuit board 43 for communication to connect the sensor board 4
0 and a main board 71 described later are connected.

Reference numeral 44 denotes a zoom roller, which is fixed to the side surface of the support base 34 with a screw 45. The tip end of the roller 44 is fitted in a straight groove provided in the fixed barrel 11 and a cam groove provided in the cam barrel 13, and the support base 34 and the second lens group 31 are moved in accordance with the rotating operation of the cam barrel 13. The zoom drive is performed in the optical axis direction.

Reference numeral 51 denotes an aperture unit, which drives the aperture blades 53 to be opened and closed by the step motor section 52 and is attached to a lens frame 62 described next. 61
Is a third lens group, is fixed to the lens frame 62, and is zoom-driven by the zoom roller 63 similarly to the second lens group 31.

Reference numeral 71 denotes a main board, which is a camera CPU
A lens CPU 7 that communicates with 107 and a shake correction CPU to be described later to control a focusing operation and a focusing operation.
2 73 is a connector, 74 is a contact block, 7
Reference numeral 5 is a lens side contact point that is connected to the contact point pin of the camera.

In the above structure, when the photographer operates the switch group 108 of the camera, focus detection and focus lens drive are started, and the shake detection sensor 39 detects a shake, and the second lens is based on the result. The group 31 is driven in the direction orthogonal to the optical axis, and image blur is suppressed.

FIG. 2 is a diagram showing the details of the main part, and more specifically, it is an exploded perspective view of the shake correction unit including the second lens group 31 shown in FIG.

First, the components omitted in FIG. 1 will be described.

Camera shake during shooting is divided into vertical (pitch) and horizontal (yaw) rotational shake of the shooting optical axis, and shake detection sensors 39p and 39y for detecting this shake.
Will be prepared. Further, in order to independently correct the shake in the two directions, the coils and the permanent magnets 37p, 37y, 38p, 38 are also driven so as to drive the second lens group 31 in the two directions.
Two sets of y are prepared. Then, the coil 37
The p, 37y and the IRED 46 are soldered and connected to the sensor substrate 40 by a power feeding wire.

Reference numeral 47 is a two-dimensional position sensor, which is a lens frame 32.
It receives the irradiation light of the IRED 46 which moves integrally with and outputs a signal corresponding to the position of the lens frame 32. Reference numeral 48 denotes a shake correction CPU, which performs an appropriate process on the amount of shake detected by the shake detection sensors 39p and 39y, and the second lens group 3
The drive amount of 1 is output. 49p and 49y are coil driving drivers, and based on the output value, the coils 37p and 49y
Energization control of 37y is performed.

Three cylinders 34a are planted on the support base 34, and the light shielding plate 35 is screwed. A bearing portion 34b that supports the guide shaft 36 is planted on the support base 34, and the guide shaft 36 slides in the vertical direction in the figure, that is, in the direction that corrects the image shake of the pitch. On the other hand, with respect to the guide shaft 36, the lens frame 32 slides laterally by the bearing 32c, that is, in the direction in which yaw image shake is corrected. Therefore, the lens frame 32 is allowed to move only up and down and left and right by the guide shaft 36, and rotation interlocking around the optical axis is prohibited.

Further, the hole 34c of the support base 34 is formed in the communication substrate 4
3 is a through hole.

In the above structure, the outer shape of the shake correction unit projected in the optical axis direction is circular, but the center thereof is occupied by the second lens group 31, so a mechanism for supporting and driving the second lens group 31. The components are dispersed and arranged in an annular space avoiding the second lens group 31.

Since the pitch and yaw image blur correction actuators in this embodiment are compact actuators composed of the permanent magnets 38 and the coils 37, one set of actuators is approximately the same as the annular space. It only occupies a quarter.

Therefore, the annular space is approximately 4 in the circumferential direction.
When equally divided, a coil 37p and a permanent magnet 38p that form a pitch shake correction actuator, a coil 37y and a permanent magnet 38y that form a yaw shake correction actuator, a pitch shake detection sensor 39p, and a yaw shake detection sensor 39y are arranged in each space. As a result, the shake detection sensor can be efficiently housed in the shake correction unit.

Further, in the present embodiment, the shake correction C
Since the PU 48 and the coil driving drivers 49p and 49y are provided on the sensor substrate 40, most of the electrical / mechanical processing from shake detection to shake correction can be performed in this unit. Therefore, the number of wires in the communication board 43 can be minimized.

Furthermore, in the present embodiment, the shake detection sensor 39 is used as the shutter 10 which is the impact source of the camera body 101.
Since the third lens group 61 is separated from the image pickup device 3 and the quick return mirror 104 as shown in FIG. 1, the running noise of the shutter 103 and the quick return mirror 104 is effectively shielded, and the shake detection sensor 39 is provided. It is possible to prevent the output error of.

Further, the sensor substrate 40 is provided through the elastic body 41.
Since it is attached to the support base 34, shock transmission of the shutter 103 and the quick return mirror 104 can be prevented,
The output error of the shake detection sensor 39 can be prevented.

(Second Embodiment) FIG. 3 is a sectional view showing a main part of a lens shutter camera equipped with an image blur correction device according to a second embodiment of the present invention, which is the same as FIG. The parts that operate are shown by the same numbers, and duplicate explanations are omitted.

The camera body 201 is integrally connected to the lens barrel 1, and the film 20 is provided inside the body.
2, a finder optical system 203, a main board 204, a connector 205, a camera CPU 206, and a switch group 207.

On the other hand, in the lens barrel 1, instead of the diaphragm, a diaphragm / lens shutter mechanism 211 is incorporated. This is because the stepper motor 212 uses the shutter blade 2
The opening / closing control of 13 is normally performed as shown in the figure, and the opening is controlled at a predetermined time only when the exposure operation is performed. The lens shutter mechanism is fixed to the lens frame 62 of the third lens group 61.

In the second embodiment, it is the lens shutter mechanism 211 that gives a harmful sound to the shake detection sensor 39, but the support base 34 of the second group lens 31 is used.
Becomes a sound insulation wall, which can effectively shield sound. Also, it is the lens shutter mechanism 211 that gives harmful vibration, but since the lens shutter mechanism 211 is fixed to a lens group (third lens group 61) different from the shake correction unit, mechanical shock shakes. It does not reach the detection sensor 39 directly.

That is, also in the second embodiment, the output error of the shake detection sensor 39 due to the driving sound and the impact of the lens shutter mechanism is effective while the shake detection sensor 39 is efficiently arranged in the shake correction unit. It has a structure that can be effectively prevented.

(Third Embodiment) FIG. 4 is a perspective view showing an essential part of a shake correcting apparatus according to a third embodiment of the present invention, and corresponds to FIG. 2 of the first embodiment. It is a partial replacement.

The shake correction unit according to the third embodiment of the present invention corrects image shake by a variable apex angle prism having a liquid, instead of correcting shake by decentering the lens group.

In FIG. 4, the parallel flat plate glass 231 is held by a front glass frame 232, and a similar parallel flat plate glass 233 (not shown) is arranged behind the glass 231 at a predetermined interval and a rear glass frame 234 (not shown). (Shown in the figure). The glass frames 232 and 234 are connected by a stretchable bellows, and a transparent liquid is sealed inside the space formed by the glass and the bellows. The variable apex angle prism is configured as described above.

235 is a variable apex angle prism support base,
The variable vertical angle prism is housed in a cylindrical space inside.
Then, the pitch pivot pin 232a that is laterally laterally implanted in the front glass frame 232 is rotatably held, and the yaw pivot pin 234a that is similarly laterally implanted in the rear glass frame 234 is vertically fixed. Hold rotatably.

Reference numeral 236p is a pitch drive arm, which includes a pitch drive coil 237p and a pitch drive angle detecting IRED2.
46p is mounted and fixed to the pitch rotation pin 232a. 238p is a permanent magnet and 247p is a PSD (semiconductor position detector) for detecting the pitch drive angle. Similarly, for the shake correction in the yaw direction, 236y, 237y, 246
y, 238y and 247y are provided.

Reference numeral 240 denotes a sensor substrate composed of a flexible printed circuit board. Like the first embodiment, the shake detection sensors 239p, 23 in the pitch and yaw directions are arranged.
9y, shake correction CPU 248, coil driver 249
p and 249y are mounted and fixed to the outer peripheral surface of the support base 235. Further, the PSD 24 is provided on the sensor substrate 240.
7p and 247y are also mounted, and the coil 237
p, 237y and IRED246p, 246y are connected by soldering with lead wires.

With the above configuration, the shake detection sensor 23
Shake correction CPU2 for camera shake detected in 9p and 239y
48 processes and energizes the coils 237p, 237y via the drivers 249p, 249y, so that the front glass 231 is centered on the shaft 232a and the rear glass 233 is rotated by the shaft 2
It rotates around 34a. Then, the photographing light beam tilts due to the light refracting action of the variable apex angle prism, and the shake on the image plane can be corrected.

The shake correction unit shown in the figure is provided with studs 235e and 235f planted on the support base 235,
It is held in the lens barrel 1 in the same manner as in FIG. 1, and moves back and forth in the optical axis direction in response to a zoom operation.

According to the above construction, also in the third embodiment, the annular space outside the variable apex angle prism having the shake correction function is divided into four equal parts, and the pitch correction correction actuator is provided in each space. By arranging the 237p and 238p, the yaw shake correction actuators 237y and 238y, the pitch shake detection sensor 239p, and the yaw shake detection sensor 239y, the shake detection sensor can be efficiently housed in the shake correction unit.

(Fourth Embodiment) The shake correction unit shown in FIG. 4 may be arranged at the forefront of the photographing optical system, separately from the focusing lens group. This is an embodiment suitable for a video camera.

At this time, the lens shutter shown in FIG.
It replaces the iris unit whose aperture diameter changes in real time according to the brightness of the subject.

Also in this embodiment, it is possible to reduce the size while incorporating the shake correction unit in the shake detection sensor, and prevent transmission of harmful drive sound and drive vibration from the diaphragm unit.

(Fifth Embodiment) FIGS. 1 to 3 or 4
In the shake correction unit shown in, the coils and the permanent magnets forming the shake correction actuator may be arranged in reverse. That is, in the above-described embodiment, the coil is arranged on the movable member side and the permanent magnet is arranged on the fixed member side.
A permanent magnet may be arranged on the movable member side and a coil may be arranged on the fixed member side.

(Correspondence between Invention and Embodiment) In each of the above-mentioned embodiments, the first lens group 21, the second lens group 31, and the third lens group 61 form an image of the subject described in claim 1 or the like. It corresponds to an optical system, the second group lens 31 and the variable apex angle prism shown in FIG. 4 also correspond to the image blur correcting optical member according to claim 1 and the like, and the coils 37 and 237 and the permanent magnets 38 and 238 are Similarly, it corresponds to an actuator that drives the image blur correction optical member according to the first aspect.

The above is the correspondence relationship between each configuration of the embodiments and each configuration of the present invention, but the present invention is not limited to the configurations of these embodiments, and the functions shown in the claims,
Needless to say, any configuration may be used as long as the functions of the embodiment can be achieved.

(Modification) The present invention describes an example applied to a single-lens reflex camera, a lens shutter camera, and a video camera. However, other optical devices and other devices that make other image blur correction devices effective, Furthermore, it can be applied as a constituent unit.

[0075]

As described above, according to the present invention as set forth in claim 1, the substantially annular space surrounding the image blur correction optical member is described in more detail. The annular space is divided in the circumferential direction. Since the shake detection unit and the actuator are housed in the small space to form the shake correction unit, the image shake correction apparatus can be downsized.

According to the second aspect of the present invention, the substantially annular space surrounding the image blur correction optical member, more specifically, two in each small space obtained by dividing the annular space into four equal parts. Since the shake detecting means and the two actuators are arranged, it is possible to reduce the size of the image shake correcting apparatus that detects shakes in two different directions of the optical system and corrects the image shake.

According to the present invention of claim 3, 1
Since the set of actuators is housed in one of the four divided small spaces, it is possible to increase the efficiency of shake detection by the shake detection unit while miniaturizing the actuator that drives the image shake correction optical member. it can.

Further, according to the present invention, the actuator for driving the shake detecting means and the image shake correcting optical member can be compactly housed in the optical group which moves back and forth in the optical axis direction by the zoom operation. it can.

According to the fifth aspect of the present invention, since the shake detecting means and the actuator for driving the image shake correcting optical member are arranged around the lens group having a movable predetermined power, the predetermined amount is provided. It is possible to reduce the size of an image blur correction device that performs image blur correction by a lens group having power.

Further, according to the present invention, since the shake detecting means and the actuator for driving the image shake correcting optical member are arranged around the variable apex angle prism,
It is possible to reduce the size of the image blur correction device that performs image blur correction by the variable apex angle prism.

According to the present invention of claim 7, the impulse during the operation of the focal-plane shutter is transmitted to the shake detecting means by the independent lens group disposed between the image shake correcting optical member and the focal-plane shutter. Since this is prevented, it is possible to prevent an output error of the shake detection unit due to the impact of the shutter of the single-lens reflex camera, and to reduce the size of the image shake correction apparatus as a whole.

According to the eighth aspect of the present invention, the lens shutter is arranged in an independent lens group different from the image blur correcting optical member, and the shock during the lens shutter operation is transmitted to the shake detecting means. Since the prevention is performed, it is possible to prevent the output error of the shake detection unit due to the impact of the shutter of the lens shutter camera, and it is possible to reduce the size of the image shake correction apparatus as a whole.

Further, according to the present invention, the light amount adjusting diaphragm is arranged in an independent lens group different from the image blur correcting optical member, and the shock during the operation of the light amount adjusting diaphragm is transmitted to the shake detecting means. Since this is prevented, it is possible to prevent an output error of the shake detection means due to the impact of the aperture of the camera, and it is possible to reduce the size of the image shake correction apparatus as a whole.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of a single-lens reflex camera according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of a shake correction unit including a second lens group in FIG.

FIG. 3 is a sectional view showing a main part of a lens shutter camera provided with an image blur correction device according to a second embodiment of the present invention.

FIG. 4 is a perspective view showing a main part of a shake correction device according to a third embodiment of the present invention.

[Explanation of symbols]

31 2nd lens group 34,235 support stand 37p, 37y, 237p, 237y coil 38p, 38p, 238p, 238y permanent magnet 39p, 39y, 239p, 239y shake detection sensor 103 focal plane shutter 211 lens shutter mechanism

Claims (9)

[Claims] 1. An optical system for forming an image of a subject, a shake detecting means for detecting shake occurring in the optical system, and a part of the optical system for preventing shake of the image due to the shake. An image blur correction optical member that is displaced within a predetermined movable range,
In an image shake correction apparatus including an actuator that drives the image shake correction optical member based on the output of the shake detection unit, the image shake correction optical member has a substantially annular space on its outer periphery. An image shake correction apparatus, wherein the shake detection means and the actuator are arranged in the annular space. 2. The shake detecting means is two sets of shake detecting means for detecting shakes in two different directions of the optical system,
The image blur correction apparatus according to claim 1, wherein the actuators are two sets of actuators that drive the image blur correction optical member in two different directions. 3. The image blur correction device according to claim 2, wherein the actuator comprises a permanent magnet and a coil. 4. The image blur correction according to claim 1, wherein the optical system is a zoom optical system, and the image blur correction optical member advances and retracts in the optical axis direction by a zoom operation. apparatus. 5. The image blur correcting optical member is a lens group having a predetermined power capable of moving in two different directions within a plane orthogonal to the optical axis.
The image blur correction device described in 2, 3, or 4. 6. The image blur correcting optical member is a variable apex angle prism that refracts a light beam passing through the optical system in two different directions.
The image blur correction device described. 7. The image forming apparatus is applied to a single-lens reflex camera having a focal plane shutter, and the optical system includes a plurality of lens groups including the image blur correcting optical members that move independently of each other during zooming. 7. The image shake correction apparatus according to claim 1, wherein one of the independent lens groups is arranged between the shake correction optical member and the focal plane shutter. 8. An optical system, which is applied to a camera having a lens shutter, wherein the optical system includes a plurality of lens groups that include the image blur correction optical member and move independently of each other during zooming. 7. The image blur correction apparatus according to claim 1, wherein the image blur correction optical member is installed in one of independent lens groups different from the image blur correction optical member. 9. A light amount adjusting diaphragm, which is applied to a camera having a light amount adjusting diaphragm, wherein the optical system includes a plurality of lens groups including the image blur correcting optical member that move independently of each other during zooming. 7. The image blur correction device according to claim 1, wherein the image blur correction optical member is installed in one of independent lens groups different from the image blur correction optical member.