LENS BARREL AND IMAGING APPARATUS

摘要

A lens barrel includes a first barrel which rotates around an optical axis; and a second barrel which supports the first barrel to slide freely around the optical axis and to be movable in an optical axis direction. One of the barrels includes a cam follower, and a cam groove is formed in the other. When the first barrel rotates, the cam follower slides in the cam groove. The cam groove includes first and second sliding portions, and an inclination angle of the first sliding portion to the optical axis is smaller than that of the second sliding portion. When transitioning from the collapsed to the photographing state, the cam follower slides on the first sliding portion and the first barrel extends. When transitioning from the photographing to the collapsed state, the cam follower slides on the second sliding portion and the first barrel is incorporated in the second barrel.

主权项

1. A lens barrel capable of expanding and contracting between a collapsed state in which an optical path is shortest and a photographing state in which the optical path is longer than in the collapsed state, comprising:
a first barrel which is rotated around an optical axis by an actuator; and a second barrel which supports the first barrel to slide freely around the optical axis and to be capable of moving in an optical axis direction, wherein one of the first barrel and the second barrel is provided with a cam follower, and a cam groove with which the cam follower engages to slide freely is formed in the other, wherein, when the first barrel rotates around the optical axis, the cam follower slides in the cam groove, thereby allowing the first barrel to move in the optical axis direction in relation to the second barrel, wherein the cam groove includes a first sliding portion and a second sliding portion which are both inclined in relation to the optical axis, and an inclination angle of the first sliding portion in relation to the optical axis is smaller than an inclination angle of the second sliding portion in relation to the optical axis, wherein, when transitioning from the collapsed state to the photographing state, the cam follower slides on the first sliding portion and the first barrel extends in relation to the second barrel, and wherein, when transitioning from the photographing state to the collapsed state, the cam follower slides on the second sliding portion and the first barrel is incorporated in the second barrel.