JP2733424B2 - Image blur prevention device and light beam deflection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image blur preventing device having a variable apex angle prism and an improvement of a light beam deflecting device.

[0002]

2. Description of the Related Art In general, an image blur correcting device added to an optical apparatus, for example, a photographing apparatus, drives a blur detecting means for detecting a blur of the entire photographing apparatus, a blur correcting means for correcting a blur, and a blur correcting means. The driving means comprises control means for calculating a shake correction amount in accordance with the shake amount detected by the shake detection means and controlling the drive of the drive means.

FIG. 3 is a sectional view of a variable apex angle prism and a holding frame for holding the prism, and the description will be made with reference to FIG. The variable apex angle prism includes a pair of transparent flat plates 11 and 12 facing each other in the figure, fixed frames 21 and 22 for fixing the pair of transparent flat plates 11 and 12, respectively, and a transparent flat plate 1.
1. A deformable bellows-shaped film 5 (bellows) for connecting the end faces of a variable apex angle prism composed of a fixed frame 21 or a transparent flat plate 12 and a fixed frame 22, and a pair of end faces 11, 21, or 12, 22 and a film Is formed of a transparent liquid 13, for example, silicon, which fills the space between them.

A pair of holding frames 23 and 24 for sandwiching the prism are arranged on both sides of the variable apex angle prism, and one of the holding frames can rotate one end face including the transparent flat plate in a pitch direction (up and down). The other holding frame has a rotating shaft (not shown) capable of rotating the other end face in the yaw direction (left and right), and a bearing portion corresponding to each rotating shaft. Are held by a fixed cylinder (not shown) having

Conventionally, fixed frames 21 and 22 which form the end surface of the variable apex angle prism together with the transparent flat plate and the holding frames 23 and 24 are connected via a fixed ring formed on the outer periphery of the transparent flat plate. , And was fixed with a somewhat soft adhesive.

[0006]

However, this adhesive has a drawback that it requires a considerable amount of time to dry and requires a long time for production. There is also a disadvantage that the thickness of the variable apex angle prism tends to vary. In particular, when a thin element is used, it floats between the holding frame and the fixed frame (FIG. 3).
A) occurs, the fixing frame is inclined and adhered to the holding frame, and the transparent flat plates 11 and 12 (FIG. 3) are parallel even though the holding frames 23 and 24 (FIG. 3) are parallel to each other. , And the apex angle 0 ° reference sometimes shifted.

On the other hand, as a method of fixing the fixing frame and the holding frame, it is conceivable to screw the fixing frame and the holding frame. However, in this case, the size of parts is increased, and furthermore, a transparent flat plate made of optical glass is used. 11 and 12 have a problem that distortion occurs due to the influence of the swelling of the prepared hole at the time of screwing.

[0008]

According to the present invention, there is provided an image blur prevention apparatus having a variable apex angle prism having a movable member including a transparent plate and a holding member for movably holding the movable member. An image blur prevention device having a bayonet mount for coupling with the holding member is provided to solve the above-described problems. Further, the present invention provides a light beam deflecting device having a variable apex angle prism having a movable member including a transparent plate and a holding member for holding the movable member movably, for coupling the movable member and the holding member. A light beam deflecting device having a bayonet mount is intended to solve the above-described problems.

[0009]

FIG. 1 is a perspective view of an image blur correcting apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a variable apex angle prism, a fixed frame, and a holding frame. An embodiment will be described.

In FIGS. 1 and 2, elements 5, 11, 12 and 13 are the same as the elements of the conventional apparatus shown in FIG. 3, and 1 and 2 fix the transparent flat plates 11 and 12, respectively. This is a fixed frame constituting a variable apex angle prism, and has a flange portion 1a, 2a on the outer periphery. Reference numeral 3 denotes a yaw-side holding frame which has a concave portion to be fitted to the flange portion 1a, holds the variable apex angle prism, and changes the apex angle by rotating the fixed frame 1 around the yaw-side rotation shaft 36. Reference numeral 4 denotes a pitch-side holding frame having a concave portion to be fitted to the flange portion 2a. Reference numeral 6 denotes a yaw-side movable coil screwed to the yaw-side holding frame 2, which is disposed in the yaw-side magnet unit 8. Similarly, 7 is a pitch side movable coil, and 9 is a pitch side magnet unit. 10 is a bearing 10a of the rotating shafts 3a, 4a of the yaw-side and pitch-side holding frames 3, 4,
It is a main lens barrel having 10b.

The variable apex angle prism includes a pair of transparent flat plates 11 and 12 facing each other and the pair of transparent flat plates 11 and 12.
, Fixing frames 1 and 2 and a transparent flat plate 11,
A deformable bellows-like film 5 (bellows) for connecting the end faces of the variable apex prism composed of the fixed frame 1 or the transparent flat plate 12 and the fixed frame 2, and a pair of end faces 11, 1 or 12, 2;
Transparent liquid 13, which fills the space between
For example, it is made of silicon.

Next, the transparent flat plates 11 and 12 in the above configuration
The connection between the fixed frames 1 and 2 and the holding frames 3 and 4 formed with the pair of end faces of the variable apex angle prism will be described in detail. A flange 1a is provided on the outer periphery of the fixed frame 1 with respect to the yaw-side holding frame 3, and a rotational bayonet configuration is formed between the yaw-side holding frame 3 and a convex portion 3a provided on the joint surface side of the holding frame 3 with the fixed frame 1. I have. Therefore, the holding frame 3 and the fixed frame 1 are closely fixed to each other at the bayonet portions of the flange portion 1a and the convex portion 3a. In addition, the fixed portion 1 is rotated by the rotation of the holding frame 3 about the rotation shaft 36, and the change of the apex angle in the yaw direction is achieved. Coil 6 screwed to holding frame 3
Is held by the magnet unit 7, an electromagnetic force is generated by energizing the coil 6, and the holding frame 3 can be moved.

The joint between the front pitch side holding frame 4 and the fixed frame 2 has the same bayonet configuration as described above.

In the embodiment described above, the transparent plate 1
1 and the fixed frame 1 or the transparent plate 12 and the fixed frame 2 as the movable member of the present invention, the holding frame 3 or 4 as the holding member of the present invention, and the flange 1a and the convex portion 3a or the flange 2a.
The projection 4a corresponds to the bayonet mount of the present invention.

As described above, according to the present invention, it is not necessary to use an adhesive for connecting the movable member and the holding member, and the positional relationship between the two can be more accurately and quickly connected. It became possible.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of a variable apex angle prism and a holding frame for holding the prism in the image blur correction device of FIG. 1;

FIG. 3 is a cross-sectional view of a variable vertex angle prism of a conventional image blur correction device and a holding frame that holds the prism.

[Explanation of symbols]

 1 Yaw side fixed frame 2 Pitch side fixed frame 3 Yaw side holding frame 4 Pitch side holding frame

Claims (2)

(57) [Claims] An image stabilization apparatus having a variable apex angle prism having a movable member including a transparent plate and a holding member for movably holding the movable member, for coupling the movable member and the holding member. An image blur prevention device comprising a bayonet mount. 2. A light beam deflecting device comprising a variable apex angle prism having a movable member including a transparent plate and a holding member for movably holding the movable member, wherein the light beam deflecting device includes a movable member and a holding member. A light beam deflector having a bayonet mount.