Optical apparatus
AssigneeCanon Kabushiki Kaisha
InventorTakayuki Tsuboi
Life of this patent
Estimating the term…
Abstract
An optical apparatus includes a barrier member disposed in front of a lens and arranged to be openable and closable, an urging member arranged to exert an urging force on the barrier member, and an abutting member arranged to be capable of abutting on the urging member, wherein, when the abutting member abuts on the urging member, the urging member exerts on the barrier member an urging force acting in a direction of closing the barrier member, and, when the abutting member does not abut on the urging member, the urging member exerts on the barrier member an urging force acting in a direction of opening the barrier member.
Claims17
An optical apparatus comprising:
- a) a barrier member disposed in front of a lens and arranged to be openable and closable;
- b) an urging member arranged to exert an urging force on said barrier member;
- and
- c) an abutting member arranged to be capable of abutting on said urging member, said abutting member moves forward and backward along the direction of an optical axis of the lens, wherein, when said abutting member abuts on said urging member, said urging member exerts on said barrier member an urging force acting in a direction of closing said barrier member, and, when said abutting member does not abut on said urging member, said urging member exerts on said barrier member an urging force acting in a direction of opening said barrier member.
An optical apparatus comprising:
- a) an optical system having a plurality of lens groups;
- b) a barrier member disposed at a front end of said optical system, said barrier system is arranged to swing around an axis which is perpendicular to an optical axis of said optical system;
- and
- c) an opening-and-closing mechanism for opening and closing said barrier member, said opening-and-closing mechanism being arranged to vary an opened position of said barrier member according to a focal length of said optical system, the opened position of said barrier member having a first state with the opened position of said barrier member being fully opened when the focal length of said optical system is short and a second state with the opened position of said barrier member being less opened than in the first state when the focal length of said optical system is long.
Dependencies are inferred from the claim text.