Imaging device driver and photography instrument employing it

1. An image pickup device driving apparatus, comprising:

an image pickup device holding portion for holding an image pickup device with an image pickup surface directed in a predetermined direction and being capable of moving in an optical axis direction;

a movable portion provided facing the image pickup device holding portion and being capable of moving with respect to the image pickup device holding portion;

three inclined portions provided on a surface of any one of the movable portion and the image pickup device holding portion, which faces an other of the movable portion and the image pickup device holding portion;

three spheres provided on a surface of the other of the movable portion and the image pickup device holding portion, which faces the three inclined portions, in a way in which the three spheres are respectively brought into contact with the three inclined portions;

a driving portion for moving the movable portion so as to change positions in which the three inclined portions and the three spheres are brought into contact with each other and to move the image pickup device held in the image pickup device holding portion in the optical axis direction with a surface direction of the image pickup surface maintained;

a lens attachment portion to which a lens portion is attached; and

a plurality of spheres provided between the movable portion and the lens attachment portion,

wherein the movable portion is capable of moving with respect to the lens attachment portion via the plurality of spheres.

2. The image pickup device driving apparatus of claim 1 , wherein the movable portion is rotatable around the optical axis direction, and the driving portion rotates the movable portion.

3. The image pickup device driving apparatus of claim 1 or 2 , wherein the three spheres have equal diameters.

4. The image pickup device driving apparatus of claim 3 , wherein the three spheres are rotatably provided on the surface of the other of the movable portion and the image pickup device holding portion, which faces the three inclined portions.

5. The image pickup device driving apparatus of claim 4 , wherein the three spheres are disposed inside indent portions provided on the surface of the other of the movable portion and the image pickup device holding portion, which faces the three inclined portions.

6. The image pickup device driving apparatus of claim 1 , wherein the plurality of spheres are rotatably provided on a surface of any one of the movable portion and the lens attachment portion, which faces an other of the movable portion and the lens attachment portion.

7. The image pickup device driving apparatus of claim 6 , wherein the plurality of spheres are disposed inside concave portions provided on a surface of the one of the movable portion and the lens attachment portion, which faces the other of the movable portion and the lens attachment portion.

8. The image pickup device driving apparatus of claim 1 , comprising an elastic portion for urging the image pickup device holding portion in one direction along the direction of the optical axis,

wherein the movable portion provides the image pickup device holding portion with an urging force in a direction opposite to the one direction.

9. The image pickup device driving apparatus of claim 1 , wherein the driving portion is a rotary motor.

10. A photographing apparatus comprising:

a lens portion;

an image pickup device;

an image pickup device driving apparatus of claim 1 ; and

a video signal processing portion for performing video signal processing with respect to a signal output from the image pickup device.