JPH10319464A - Shake correcting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to shield harmful light while miniaturizing a device without providing a new light shielding member and further to be easily applied for even an optical system in which convex lens is arranged near the device by providing a light shielding part for preventing the leakage of light rays from space formed when a correcting means is moved in a rotation regulating member. SOLUTION: A correcting lens L1 is held by a supporting frame 1 and this supporting frame 1 is attached to a base plate 2 by a sliding pin and a sliding cam and positionally regulated in an optical axial direction. But the supporting frame 1 can be moved in a plane perpendicular to an optical axis. At this time, the rotation regulating member 4 prevents the rotation in the plane perpendicular to the optical axis, of the correcting lens L1. When the lens L1 is moved in a fixed direction of a correcting direction, the regulating member 4 is moved together with the lens L1, that is, never moved in other directions. Then, the aperture of the regulating member 4 is formed to an elliptic shape, to be small in diameter in a direction where the regulating member 4 is moved together with the lens L1, so that the regulating member 4 is moved together with the lens L1 only in this direction, to shield the harmful light passing through the space (a regulating part 4f) formed at the time of attaining the movement in the direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a shake correcting apparatus having a correcting means for correcting a shake applied to an optical device on which the shake correcting apparatus is mounted.

[0002]

2. Description of the Related Art In a current camera, all operations important for photographing, such as exposure determination and focusing, have been automated, and even a person who is unskilled in camera operation has a very low possibility of failing in photographing. .

Recently, a system for correcting an image blur caused by a camera shake applied to a camera has been studied, and a factor which causes a photographer to fail in photographing has almost disappeared.

Here, a system for correcting image blur caused by camera shake will be briefly described.

[0005] The camera shake at the time of photographing is generally a vibration of 1 Hz to 12 Hz as a frequency. As a general idea, it is necessary to detect the camera shake caused by the camera shake and to displace the correction lens according to the detected value.
Therefore, in order to be able to take a picture in which image shake does not occur even if camera shake occurs, first, it is necessary to accurately detect the camera vibration, and second, to correct the optical axis change due to the camera vibration. Needs to be displaced and corrected.

In principle, this vibration (camera shake) is detected by a shake detection sensor for detecting acceleration, speed, and the like, and a displacement is obtained by electrically or mechanically integrating an output signal of the shake detection sensor. This can be achieved by mounting the output means on a camera. Then, based on this detection information, a correction means (consisting of a correction lens, a fixed frame holding the lens, and the like) in the shake correction apparatus mounted to change the photographing optical axis is controlled (the correction lens is displaced). ) Allows image blur correction.

Here, an outline of an anti-vibration system using a shake detection sensor will be described with reference to FIG.

FIG. 8 shows a vertical camera shake (pitch direction) 81p and a horizontal camera shake (yaw direction) 8 in the direction of the arrow 81 shown in FIG.
FIG. 3 is a diagram illustrating an example of a system that suppresses image blur caused by 1y.

In FIG. 1, reference numeral 82 denotes a lens barrel;
y is a shake detection sensor for detecting camera vertical shake and camera lateral shake, respectively.
It is indicated by p, 84y. 85 is a correction means (87p, 8
7y are coils for applying thrust to the correcting means 85, 86
p and 86y are detection elements for detecting the position of the correction means 85)
The correction means 85 is disposed in a position control loop, is driven with the outputs of the shake detection sensors 83p and 83y as target values, and secures image stability on the image plane 88.

Various optical devices such as a camera provided with the above-described anti-vibration system have been proposed by the present applicant. And among these proposals, when the correcting means moves, in order to cut harmful light through a space formed between the fixing frame and a correction lens which is a component of the correcting means, In JP-A-1-134420, the limiting member is driven in accordance with the driving of the correction means. In JP-A-6-3727, a light-blocking member is provided in front of a correction optical system for correcting shake. ing.

With this arrangement, the harmful light passing through the space formed when the correction means for correcting the image blur is moved is prevented from being mixed in the luminous flux when taking a camera as an example. Has become.

[0012]

However, in the above-mentioned conventional example, a light-blocking member or the like must be newly provided in addition to the shake correction device. There is a problem that a space is required on the front or rear side, and the optical device itself becomes large.

Further, in order to make the shake correction device compact, the correction lens is often formed of a concave lens group, and in this case, a large-diameter convex lens is easily arranged near the shake correction device. Therefore, a light-shielding member as in the conventional example cannot be arranged, and such an optical system cannot be employed.

On the other hand, even if the light shielding member can be provided,
If the space to be shielded is not separated from the center of the optical axis, effective light rays can be blocked by the light-shielding part, so even if it is a compact optical system, the shake correction device itself becomes large, and the meaning of a compact optical system is important. There was also the problem of fading.

(Object of the Invention) It is an object of the present invention to provide a compact device and shield harmful light without providing a new light-blocking member, and to provide a convex lens near the device. It is an object of the present invention to provide a shake correction device which can be easily applied to an optical system in which the light is disposed.

[0016]

In order to achieve the above object, the present invention according to claim 1 comprises a correcting means for correcting a shake by moving in a direction perpendicular to an optical axis; In a shake correction device having a rotation restricting member that prevents rotation in a plane perpendicular to the optical axis, and a support unit that movably supports the correction unit, the correction unit moves to the rotation restriction member. In this case, the shake correcting device is provided with a light-shielding portion for preventing light from leaking from a space formed between the supporting means.

According to another aspect of the present invention, there is provided a correction means for correcting a shake by moving in a direction perpendicular to an optical axis, and an effective light beam passing through the correction means. A rotation restricting member having an opening for allowing the light to pass therethrough, and a rotation restricting member for preventing the correction means from rotating in a plane perpendicular to the optical axis. When moving in one direction, they move together and do not move in the other direction, and the opening is a shake correction device in which the direction of movement with the correction means is narrower than the other direction. is there.

According to the above construction, the opening of the rotation restricting member is formed in an elliptical shape, the diameter in the direction of movement with the correction means is reduced, and the rotation control member is moved with the correction means only in that direction. The structure is such that harmful light passing through the formed space is shielded, and only the effective light flux passes.

[0019]

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

FIGS. 1 to 7 are views showing a shake correcting apparatus according to an embodiment of the present invention. FIG. 1 is an exploded perspective view showing components of a main part of the shake correcting apparatus, and FIG. A in FIG.
FIG. 3 is a perspective view of a stepping motor configured in a different direction, FIG. 3 is a view from the left side of FIG. 1 (for explanation, the hard substrate 111 is removed and the inside is visible);
4 is a rear view of the rotation restricting member shown in FIG. 1, and FIG. 5 is a rear view of FIG. 6 and 7 are views showing a case where the correction means has moved, FIG. 6 shows a state in which the rotation restricting member is removed, and FIG. 7 shows a state in which the rotation restricting member is attached.

First, the configuration of a shake correction apparatus according to an embodiment of the present invention will be described with reference to FIGS.

The correction lens L1 is held by the support frame 1, and the base plate 2 is provided with sliding cams 2a on the same plane perpendicular to the optical axis in three directions. Reference numeral 7 denotes a sliding pin, which is pressed into three holes 1a provided in the supporting frame 1 via a sliding cam 2a, so that the supporting frame 1 slides on the base plate 2 with the sliding pin 7. Although they are connected by the cam 2a and their positions are regulated in the optical axis direction, they can be moved in all directions on a plane perpendicular to the optical axis.
Reference numeral 2d denotes holes for fixing and supporting the shake correction apparatus according to the present embodiment, and are provided at three places on the outer periphery. By inserting another member, for example, a roller, into this hole, the shake correction device can be supported in the optical device.

Reference numerals 5p and 5y denote yokes, which are fixed to the support frame 1 by caulking or screws according to the pitch and yaw driving directions, respectively. 6p and 6y are permanent magnets, which are magnetically coupled to the yokes 5p and 5y. 8p, 8y
Is a coil unit. The coil 8p (same for 8y) is formed integrally with the coil frame 8a in a resin material, and both terminals of the coil winding are connected to terminal pins 8b, which are conductive members pressed into the coil frame 8a. They are connected to form a unit, and are adhesively fixed to the main plate 2. Further, the terminal pins 8b are penetrated and soldered to the hard substrate 10 described later, and are electrically connected.

By energizing the driving means (coils of) these magnets and coils facing each other, the correction means consisting of the correction lens L1 and the support frame 1 are driven in the pitch direction P and the yaw direction Y, and an image is formed. The shake is corrected.

Reference numeral 3 denotes a locking member. When an output of a stepping motor unit, which will be described later, is transmitted to a gear portion 3a, a projection 1b provided on the support frame 1 causes a cam 3 of the locking member 3 to move.
b, and the correction means can be locked (locked) at a predetermined position (details will be described later). Reference numeral 4 denotes a rotation restricting member, which is formed by fitting two shafts 4a, 4a to a slot 1c (see FIG. 6) provided in the support frame 1 via the base plate 2. The rotation around the optical axis 1 is regulated. Reference numeral 10 denotes a photoreflector 16 for detecting a position corresponding to each movement position of pitch and yaw on the support frame 1 side.
p, 16y are mounted on the back surface, and are a hard board (printed board) on which terminals of a stepping motor described later, terminals of the coil units 8p, 8y, and elements related to these controls are mounted. . Reference numerals 9p and 9y denote target members for position detection.
A black and white pattern is printed so that the outputs of p and 16y change at a fixed rate according to the position of the correction means.

Next, a stepping motor for driving the locking member 3 will be described with reference to FIG. The components of these stepping motors are configured in section A shown in FIG.

Reference numeral 191 denotes a stator yoke in which a plurality (six) of soft magnetic plates are accumulated and fixed, and the soft magnetic plates are unitized by laminating and stacking plates of the same shape. ing. 192 is the same part as the stator yoke 1 and can be the other stator yoke of the two-phase stepping motor. Stator yoke 1
Numeral 92 is used by turning the stator yoke 191 upside down.

Numeral 193 denotes a rotor made of a plastic magnet which is rotatable by the excited state of the stator yokes 191 and 192. The outer periphery of the rotor is divided and alternately magnetized, and the rotor is anisotropically oriented. A gear 193a for transmitting the rotational force of the rotor 193 to the gear portion 3a of the locking member 3 in FIG. 1 is provided integrally.
Reference numerals 194 and 195 denote coils for exciting the stator yokes 191 and 192, respectively, and the coils 194 and 195 are formed of the same components. The coils 194, 195 are connected to the connection terminals 194a, 194b, 19
The configuration is such that the stator yokes 191 and 192 are excited by being energized from 5a and 195b, respectively.

The stator yokes 191 and 192 are positioned and supported by a shaft 2 e provided on the main plate 2.
The rotor 193 also has a rotation shaft 193b supported by the main plate 2 (see FIG. 3).

Reference numeral 196 denotes a motor case lid which supports the rotation shaft 193c of the rotor 193 and supports the claw 1
At steps 97a to 197e, the unit is formed as a stepping motor 19 as an electromagnetic drive device by hooking the groove 2f of the main plate 2 respectively.

Next, the operation of the stepping motor 19 having the above configuration will be described.

The connection terminals 194 are connected to the coils 194 and 195.
a, 194b, 195a, and 195b, a magnetic field is generated in the stator yokes 191 and 192 and interacts with the magnetic field of the magnet rotor 193 to form a closed magnetic path. At this time, if the coil 195 is not energized, the magnetic path generated by the energized coil 194 becomes dominant, and a rotational torque is generated in the magnet rotor 193 (the same applies when only the coil 195 is energized). Also,
Similarly, when the coils 194 and 195 are energized, a magnetic path is formed in each of the stator yokes 191 and 192 to act on the magnet roller 193 to apply a rotational torque to the magnet rotor 193.

Therefore, both coils 194, 195
By switching the current direction sequentially,
A conventionally known stepping motor can be driven, and the engaging member 3 can be rotated by a predetermined angle by the engagement between the gear portion 193a of the magnet rotor 193 and the gear portion 3a of the engaging member 3.

Next, the rear side will be described with reference to FIGS. 5 to 7 and FIG.

A locking member 3 is rotatably supported by the base plate 2, and a gear 193a provided on a rotor 193 of the stepping motor shown in FIG. The member 3 can be driven in the rotation direction. Four cams 3b provided on the locking member 3
Locks and unlocks the support frame 1 in relation to the four projections 1b provided on the support frame 1 (only two points are visible in FIG. 1), thereby functioning as locking means. ing.

That is, when the locking member 3 is rotated counterclockwise, the cam portion 3b of the locking member 3
The support frame 1 is free with respect to the locking member 3, but when the locking member 3 is rotated clockwise, the cam portion 3
The innermost circumferential portion 3c of b contacts the protrusion 1b, and the support frame 1 and the locking member 3 are engaged. That is, the support frame 1 is locked to the main plate 2.

Therefore, when performing the shake correction, the locking member 3 is driven counterclockwise by the stepping motor so that the support frame 1 is in a free state (unlocked state) with respect to the locking member 3, and on the other hand, the shake is corrected. At the end of the correction, the locking member 3 is driven clockwise to lock the support frame 1 with respect to the main plate 2 (locked state).

When the shake correction drive is performed by the above-described configuration, the pitch P and the yaw Y shown in FIG.
In addition to being free to move in the (vibration correction direction), it also moves in the rotation direction R. Since this rotation deteriorates the shake correction accuracy, the present embodiment employs the following method to reduce the influence of the rotation.

FIG. 4 shows only the rotation restricting member 4 as described above. As shown in FIG. 1, two shaft portions 4a extending from the rotation restricting member 4 It penetrates the provided hole 3d and a long hole (not shown) provided in the main plate, and can fit and slide in the long hole portion 1c of the support frame 1.

The rotation restricting member 4 includes a claw 2 provided on the main plate 2.
At b and 2c (see FIG. 5), elastic engagement is restricted in the optical axis direction. Further, the protrusion 2g and the protrusion 2 around the shaft support portion of the rotor magnet 193 forming the stepping motor.
h, the sliding surfaces 4b, 4c, 4d,
4e is fitted and slid, and regulates the rotation regulating member 4 to be movable only in the direction B in FIG.

With the above configuration, the support frame 1 cannot rotate with respect to the base plate 2, and at this time, it moves only in the pitch direction and the yaw direction by the driving force of the magnet 6 and the coil unit 8. Can be. In detail, in the direction B of FIG. 5, the support frame 1 moves with respect to the main plate together with the rotation restricting member 4, and in the direction perpendicular to the direction B (direction C), only the support frame 1 is rotated by the shaft 4a and the elongated hole 1c. It moves with respect to the main plate 2.

The opening of the rotation restricting member 4 has an elliptical shape as shown in FIG. 4, and has a diameter b in the B direction that moves together with the support frame 1 and a diameter in the C direction perpendicular to the B direction. The relationship of c is “b <c”.

Thus, the harmful light passing through the space D as shown in FIG. 6 formed when the support frame 1 is moved from the state of FIG. 5 to the state of FIG. 7 can be effectively cut. Can be. That is, a part of the rotation restricting member 4 in the direction B, specifically, a part having a diameter (c-b) is a light shielding portion (4f in FIG. 7).
(Cross-hatched portion) indicated by.
Even if the support frame 1 moves in the direction C, light is shielded by the shape of the support frame 1 (projections 1b, magnet receivers, etc.), so that even if the diameter c of the opening of the rotation regulating member 4 is large, harmful light There is no adverse effect of

As described above, since the light-blocking portion is effectively provided on the rotation restricting member 4, there is no need to newly provide a light-blocking member, and the structure can be made compact.

Even if there is a large-diameter optical member before and after the correcting means, harmful light can be effectively cut.

In the present embodiment, one rotation restricting member 4 is arranged. However, the present invention can also be applied to a case where the rotation restricting member 4 is composed of two members. Needless to say, it does not depend on the method.

[0047]

As described above, according to the present invention,
It is possible to shield harmful light without providing a new light-blocking member, and it can also be compactly configured for an optical system in which a convex lens is arranged in the vicinity of the device, and can achieve the same effect. An apparatus can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing main components of a shake correction apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of a stepping motor configured in a portion A of FIG. 1 from another direction.

FIG. 3 is a diagram viewed from the left side of FIG. 1;

FIG. 4 is a rear view of the rotation restricting member shown in FIG. 1;

FIG. 5 is a rear view of FIG. 3 with a rotation restricting member attached.

FIG. 6 is a rear view of FIG. 3 with the rotation restricting member removed.

FIG. 7 is a rear view of FIG. 3 showing a state where the rotation restricting member is cutting harmful light.

FIG. 8 is a perspective view showing a schematic configuration of a general anti-vibration system using a shake detection sensor.

[Explanation of symbols]

 L1 Correction lens 1 Support frame 2 Main plate 3 Locking member 4 Rotation restricting member 4f Restricting part

Claims (3)

[Claims] 1. A correcting means for correcting a shake by moving in a direction perpendicular to an optical axis, a rotation regulating member for preventing rotation of the correcting means in a plane perpendicular to the optical axis, and the correcting means And a supporting means for movably supporting the rotation preventing member, wherein when the correcting means moves to the rotation restricting member, light leakage from a space formed between the correcting means and the supporting means is prevented. A shake correction device comprising a light shielding unit. 2. A correction means for correcting a shake by moving in a direction perpendicular to the optical axis, and an opening for passing an effective light beam passing through the correction means, wherein the correction means has a vertical portion with respect to the optical axis of the correction means. A rotation restricting member that prevents rotation in a flat plane, wherein the rotation restricting member moves together when the correction unit moves in one direction of the correction direction, but moves in the other direction. The direction in which the opening moves together with the correction means is narrower than the other direction. 3. The shake correction apparatus according to claim 2, wherein the opening of the rotation restricting member has a substantially elliptical shape.