Device for protecting the photographic optical system of camera
AssigneeCanon Kabushiki Kaisha
InventorsShinya Yomogizawa, Kiyoshi Ikuta
Life of this patent
Estimating the term…
Abstract
This patent application discloses a device for protecting the photographic optical system of a camera having a first detector for detecting that the back cover of the camera is open or closed and a second detector for detecting whether or not the film is winding on the takeup spool, wherein when that the back cover is open or that the film is not winding on the spool is detected by the first and second detectors, either the rear of the photographic optical system is shut off, or the photographic optical system is moved forward, so that the rear vertex of the photographic optical system is prevented from being touched with a finger or the edge of the film leader.
Claims36
A photographic optical system protecting device for a camera comprising:
- (A) a photographic optical system;
- (B) protecting means for protecting a surface of a rear portion of said photographic optical system;
- and
- (C) control means responsive to opening of a cover for the purpose of loading photographic material or not setting of the photographic material to the photographic preparation completion state for actuating said protecting means.
A photographic optical system protecting device for a camera comprising:
- (A) a photographic optical system,
- said photographic optical system having its rear portion surface made displaceable;
- (B) drive means for displacing said photographic optical system;
- (C) control means for producing a control signal for controlling said drive means in such a manner that a surface of a rear portion of said photographic optical system is moved farther away from a cover in response to either opening of a cover for the purpose of loading a photographic material, or to detection of the fact that said photographic material is not set in a photographic preparation completion state;
- and
- (D) operating means for making said optical system arbitrarily displaceable when said control signal is not produced from said control means.
An optical system protecting device for a camera comprising:
- (A) protecting means for protecting a surface of a rear portion of said optical system;
- and
- (B) control means responsive to opening of a cover for the purpose of loading photographic material or not setting of the photographic material to the photographic preparation complete state for actuating said protecting means.
A photographing optical system protecting device for a camera comprising:
- (A) protecting means for protecting a portion of said photographing optical system which is exposed within the camera;
- and
- (B) control means for actuating said protecting means in response to an opening of a cover for loading photographic material or to a state in which the photographic material is not set at a prescribed photographic preparation completion state.
A photographic optical system protecting device for a camera comprising:
- (A) operating means for displacing said photographing optical system to any desired position;
- and
- (B) control means for moving a portion of the photographic optical system exposed within the camera away from a photographic material loading cover or said photographic material prior to an action by said operating means in response to an opening of said photographic material loading cover or to a state in which said photographic material has not been set at a prescribed photographic preparation completion state.
A photographic optical system protecting device for a camera comprising:
- (A) protecting means for protecting a portion of the optical system of the camera exposed within the camera;
- and
- (B) contorl means for actuating said protecting means in response to an opening of a cover for loading photographic material or to a state that said photographic material may scratch said portion of the optical system exposed within the camera.
Dependencies are inferred from the claim text.