JP2003270695A - Image blurring correction device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize an image blurring correction device. <P>SOLUTION: A rib 1a concentrically circular to an optical axis is provided at a pitch frame 1 so as to regulate the movable range of an image blurring correction lens L1. The rib 1a is positioned between the effective diameters of the image blurring correction lens L1 and a fixed lens L2 and yokes 8a and 8b or magnets 7a and 7b. A protrusion 4b engaged with the rib 1a is provided at a fixed frame 4, so that the movable range of the image blurring correction lens L1 is regulated. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image blur correction device used in an optical device such as a video movie and a lens barrel using the image blur correction device.

[0002]

2. Description of the Related Art Recently, with the spread of digital type video movies, an ultra-compact and high-quality image blur correction device is desired. Some of such image blur correction devices drive a part of the taking lens in a plane perpendicular to the optical axis for correction. In this system, driving means is arranged in two axial directions with respect to the movable lens for moving the lens, and a regulating member for regulating the movable range is provided. With respect to the structure of such an image blur correction device, an image blur correction device described in Japanese Patent No. 2641172 is proposed.

The structure of a conventional image blur correction device will be briefly described below with reference to FIG. 1 of the publication.

In FIG. 1 of the publication, a fixed frame 23 for holding the correction lens 22 can slide on a pitch shaft 25 via a bearing (oilless metal) 24. The pitch shaft 25 is fixed to the first holding frame 26. A pitch coil 28 is attached to the fixed frame 23. The pitch coil 28 is placed in a magnetic circuit composed of a pitch magnet 29 and a pitch yoke 210, and an electric current is passed through the coil to fix the fixed frame 23.
Are driven in the pitch direction with respect to the first holding frame 26.

The pitch magnet 29 is attached to the stator 220, and the pitch yoke 210 is attached to the second holding frame 21.
It is attached to 9. The first holding frame 26 includes a yaw shaft 215 extending in the yaw direction and a yaw shaft 215.
It has a housing 217 containing a bearing (oiles metal) 24 that slides on it.

Since the housing 217 is fixed to the second holding frame 219, the first holding frame 26 is fixed to the second holding frame 2.
It can move freely in the yaw direction with respect to 19. The yaw coil 221 is provided in the first holding frame 26 similarly to the fixed frame 23, and the yaw coil 221 serves as the second holding frame 219.
222 and yaw yoke 22 attached to the
2 and a stator 220 separated and fixed by a stopper 223
It is placed in a magnetic circuit composed of a yaw magnet (not shown) attached to the
The holding frame 26 is configured to be driven in the yaw direction with respect to the second holding frame 219.

[0007]

However, the conventional image blur correction device described above has the following problems.

Since the shaft for guiding the movement and the coil for driving in the moving direction are arranged side by side with respect to the correction lens when viewed from the optical axis direction, the width and height of the correction device are high. However, there is a problem that it cannot be miniaturized.

[0009]

SUMMARY OF THE INVENTION An image blur correction apparatus according to the present invention is an image blur correction apparatus for moving an image blur by moving a part of a photographing lens in a plane perpendicular to an optical axis. A lens holding frame provided with a first restricting portion for holding and restricting a moving range of the correction lens, and a first for guiding the lens holding frame to move in a first direction in a plane perpendicular to the optical axis. Guide means, second guiding means for guiding the lens holding frame in a second direction orthogonal to the first direction, and first driving means for driving the lens holding frame in the first direction. A second driving means for driving in the second direction, a position detecting means for detecting the position of the correction lens, and a second for restricting the movable range of the correction lens by engaging with the first restriction portion.
Fixing means having a restricting portion, and the first and second restricting portions are substantially concentric with respect to the optical axis and are first and second.
It is configured inside the driving means.

With this structure, in order to regulate the movable range of the correction lens, the regulation member is arranged between the correction lens and the driving means in a substantially concentric circle with respect to the optical axis, and engages with this regulation member. By providing the non-engagement member for the fixing means, the image blur correction device can be downsized.

Further, in the image blur correction device of the present invention, the first and second driving means are arranged at positions not on the same plane, and the first and second driving means are arranged on the image plane side. The position detecting means is arranged on the object side of the driving means or on the image plane side of the driving means arranged on the object side.

With such a structure, the pitch driving means and the yaw driving means are arranged so as to be displaced with respect to the optical axis direction so that a step can be formed, and the position detecting means is arranged at the stepped portion, thereby arranging the optical axis. The space in the direction can be effectively used, and the device can be downsized.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1, 2 and 3.

FIG. 1 is a front view of the image blur correction device according to the present embodiment. 2 is a sectional view taken along line Y1-Y2 in FIG.
FIG. 3 is a sectional view taken along line X2-O-Y2 in FIG.

L1 is an image blur correction lens, and L2 is a fixed lens.

The image blur correction lens L1 is held by the pitch frame 1, and the two shafts 3a and 3b provided on the yaw frame 2 for moving the correction lens L1 in the yawing direction are used as guides in the pitching direction (up and down). It is possible to move to. Further, the fixed frame 4 is provided with two shafts 5a and 5b, and the yaw frame 2 is movable in the yawing (left and right) directions by using the two shafts 5a and 5b as guides.

As a result, the image blur correction lens L1 is movable in the pitch / yaw direction with respect to the fixed frame 4.

The pitch frame 1 and the yaw frame 2 are integrally provided with coils 6a and 6b, respectively. Magnets 7a and 7b magnetized in two poles are provided on the yokes 8a and 8b at positions facing the coils 6a and 6b, respectively. The yokes 8a and 8b are provided and fixed to the fixed frame 4. The magnets 7a, b and the coils 6a, b constitute a magnetic circuit, and by energizing the coils, the pitch frame 1 and the yaw frame 2 can be driven in respective predetermined directions.

An actuator Ap composed of a coil 6a, a magnet 7a, and a yoke 8a for driving the image blur correction lens L1 in the pitch direction is arranged from the guide 5b of the yaw frame 2 in the object direction (P arrow direction), and It is configured to overlap when viewed from the axis.

An actuator Ay composed of a coil 6b for driving the image blur correction lens L1 in the yaw direction, a magnet 7b, and a yoke 8b is arranged on the image plane side (direction of arrow Q) with respect to the guide 3b of the pitch frame 1, and It is configured to overlap when viewed from the axis. In this embodiment, the actuator Ap is formed with a step in the direction of the subject with respect to the actuator Ay.

As a result, when the image blur correction device is viewed from the optical axis direction, the guide portion and the actuator portion are arranged so as to overlap each other, so that the size in the width and height directions can be reduced.

Further, the pitch frame 1 is provided with an LED 9 for detecting the position of the image blur correction lens L1 with respect to the fixed frame 4. A position detecting element (PSD) 10 capable of detecting a biaxial direction (pitch / yaw direction) position at a position facing the LED 9 and separated by a predetermined distance is provided on the boss portion 4a of the fixed frame 4 via the printed board 11. It is fixed. The PSD 10 is arranged on the subject side of the yoke 8b (direction of arrow P). As a result, the position detecting means (LED 9 and PSD) is placed in the space generated by the structure in which the guide portion and the actuator portion are overlapped.
By effectively arranging 10), the components in the device are arranged at a high density and the device is downsized.

The pitch frame 1 has ribs 1 concentric with the optical axis for restricting the movable range of the image blur correction lens L1.
a is provided. The position of the rib 1a depends on the effective diameters of the image blur correction lens L1 and the fixed lens L2, the yoke 8a,
b or between the magnets 7a and 7b. By providing the fixed frame 4 with the projection 4b that engages with the rib 1a, the movable range of the image blur correction lens L1 is regulated.

In this embodiment, the position detecting means (LE
Although the D / PSD is provided on the subject side of the yoke 8a, it may be provided on the image plane side of the yoke 8b.

Further, although the movable range is regulated substantially concentrically with respect to the optical axis, the ribs 1a and the protrusions 4b may be substantially concentrically provided over the entire circumference, or,
It is not always necessary to provide it on the entire circumference, and if the movable range can be restricted, at least one of the rib 1a and the protrusion 4b may be arranged so as to be partially concentrically arranged.

As the position detecting means, LED and PS
Although D is used, it is not limited to this as long as the position can be detected. For example, there are a magnet and a magnetoresistive element magnetized at predetermined intervals.

As described above, according to this embodiment,
A guide shaft for moving the image blur correction lens and a coil or magnet for driving, a pitch moving means and a yaw driving means, or a yaw moving means and a pitch driving means when viewed from the optical axis direction, By arranging them so that they overlap, the width and height of the correction device can be reduced.

Further, in order to restrict the movable range of the correction lens, a restriction member is arranged between the correction lens and the driving means on a substantially concentric circle with respect to the optical axis, and a non-engaging member which engages with this restriction member. It is possible to configure a small image blur correction device by providing the fixed frame with the. Furthermore, by disposing the non-engaging portion on the outer periphery of the holding portion of the fixed lens, it is possible to regulate the movement without forming a new non-engaging portion such as a protrusion.
Further miniaturization can be performed.

Further, the pitch driving means and the yoke driving means are arranged so that a step can be formed in the optical axis direction, and the position detecting means is arranged at the stepped portion to make a space in the optical axis direction effective. It is possible to reduce the size of the device by arranging the parts in the device at a high density by utilizing the above.

[0030]

According to the present invention, in order to restrict the movable range of the correction lens, a movable restriction member is arranged between the correction lens and the driving means in a substantially concentric circle with respect to the optical axis. By providing the fixed frame with a non-coupling member that is coupled to the movable frame, the movement can be restricted inside the movable portion, and thus a small correction device can be configured.

Further, according to the present invention, the pitch driving means and the yoke driving means are arranged so as to be displaced with respect to the optical axis direction so that a step can be formed, and the position detecting means is arranged at the stepped portion, whereby the light is detected. The size of the device can be reduced by effectively arranging the space in the axial direction.

[Brief description of drawings]

FIG. 1 is a front view of an image blur correction device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line Y1-Y2 in FIG.

3 is a sectional view taken along line X2-O-Y2 in FIG.

[Explanation of symbols]

L1 ... Image stabilization lens L2: Fixed lens 1 ... pitch frame 2 ... Yaw frame 3ab ... Guide shaft 4 ... Fixed frame 5ab ... Guide shaft 6ab ... coil 7ab ... Magnet 8ab ... York 9 ... LED 10 ... PSD Ap: Pitch drive actuator Ay: Drive actuator in yaw direction

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yutaka Takahashi             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5C022 AB55 AC54 AC74

Claims (4)

[Claims] 1. An image blur correction device for performing image blur correction by moving a part of a taking lens in a plane perpendicular to an optical axis, wherein the correcting lens is held and a moving range of the correcting lens is regulated. The lens holding frame provided with the first restricting portion and the lens holding frame in a plane perpendicular to the optical axis.
First guiding means for guiding the movement in the direction of, and second guiding means for guiding the movement of the lens holding frame in the second direction orthogonal to the first direction, and the lens holding frame. A first driving means for driving the lens in a first direction, a second driving means for driving in a second direction, a position detecting means for detecting the position of the correction lens, and a first restricting portion. Fixing means having a second restricting part for restricting the movable range of the correction lens, and the first and second restricting parts are substantially concentric with the optical axis and have the first and second restricting parts. An image blur correction device, characterized in that the image blur correction device is arranged inside the second driving means. 2. The image blur correction device according to claim 1, wherein the first and second restricting portions are provided in a substantially concentric circle shape over the entire circumference. 3. The image blur correction device according to claim 1, wherein at least one of the first and second restricting portions has a configuration in which they are partially arranged in a substantially concentric circle shape. . 4. The first and second driving means are arranged at positions not on the same plane, and among the first and second driving means, on the object side or the object side of the driving means arranged on the image plane side. The image blur correction device according to any one of claims 1 to 3, wherein the position detection means is arranged on the image plane side of the arranged driving means.