Quantcast

Lens barrel

Imported: 25 Feb '17 | Published: 06 Aug '02

Masanori Ishikawa

USPTO - Utility Patents

Abstract

In a lens barrel having a first holding tube holding a first optical system and a second holding tube holding a second optical system, support rollers are arranged at three parts on the periphery of each of the first and second holding tubes to restrain these optical systems from tilting. The positions of the support rollers are arranged to be respectively shifted from the centers of gravity of the holding tubes either forward or rearward in the direction of an optical axis. If the direction in which an image plane is caused to tilt by tilting of one of the two optical systems is opposite to the direction in which the image plane is caused to tilt by tilting of the other, the tilts of the image plane caused by the tilting movements of the two optical systems are arranged to offset and cancel each other by setting, for example, the support rollers of the first holding tube in rear of the center of gravity of the first holding tube and the support rollers of the second holding tube also in rear of the center of gravity of the second holding tube.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

FIG. 1 is a longitudinal sectional view of a lens barrel according to a first embodiment of the invention.

FIG. 2 is a perspective view showing essential parts of the lens barrel shown in FIG.

1.

FIG. 3 is an exploded perspective view of an image-shake correcting device of the lens barrel shown in FIG.

1.

FIG. 4 is a block diagram showing the arrangement of a camera system having the lens barrel shown in FIG.

1.

FIG. 5 is a flow chart showing a main operation of the camera system shown in FIG.

4.

FIG. 6 is a longitudinal sectional view of a lens barrel according to a second embodiment of the invention.

FIG. 7 is a longitudinal sectional view of a lens barrel according to a third embodiment of the invention.

Claims

1. A lens barrel comprising:

2. A lens barrel according to claim 1, wherein the positions of said first plurality of projections and said second plurality of projections are shifted in phase.

3. A lens barrel according to claim 1, wherein said second lens group is arranged to move along the optical axis for focusing.

4. A lens barrel according to claim 1, wherein said second lens group is arranged to move along the optical axis for zooming.

5. A lens barrel according to claim 1, wherein:

6. A lens barrel comprising:

7. A lens barrel comprising: