Finder optical system and camera having the system
AssigneeCanon Kabushiki Kaisha
InventorHiroshi Saito
Life of this patent
Estimating the term…
Abstract
A finder optical system for observing an object therethrough, includes a variable-power objective optical system, an eyepiece optical system for guiding light from the object via the objective optical system to an observer, and an adjustor for changing the optical characteristics of an image of the object observed by the observer through the eyepiece optical system based on information about the temperature of the finder optical system, the distance from the finder optical system to the object, and the zoom position of the objective optical system.
Claims42
A finder optical system for observing an object therethrough, comprising:
- a variable-power objective optical system having an imaging position;
- an eyepiece optical system, which is capable of moving on an optical axis, for guiding light from the object via said objective optical system to an eye of an observer, thereby establishing a finder view;
- a visual field frame that is arranged on or near the imaging position;
- a temperature detector for detecting temperature information;
- a distance detector for detecting an object distance;
- a zooming detector for detecting a zoom position of said objective optical system;
- and
- an adjuster for changing the finder view based on the temperature information, the object distance, and the zoom position of said objective optical system.
A finder optical system for observing an object, comprising:
- an objective optical system having an imaging position;
- an eyepiece optical system, which is capable of moving on an optical axis, for guiding light from the object via said objective optical system to an eye of an observer;
- a visual field frame that is arranged on or near the imaging position;
- a temperature detector for detecting temperature information;
- and
- an adjuster for changing the imaging position of said objective optical system based on the temperature information.
A camera comprising:
- a photographing optical system for forming an image of an object on a photosensitive plane;
- and
- a finder optical system for observing said object therethrough, wherein said finder optical system comprises:
- (a) a variable-power objective optical system having an imaging position;
- (b) an eyepiece optical system, which is capable of moving on an optical axis, for guiding light from the object via said objective optical system to an eye of an observer, thereby establishing a finder view;
- (c) a visual field frame that is arranged on or near the imaging position;
- (d) a temperature detector for detecting temperature information;
- (e) a distance detector for detecting an object distance;
- (f) a zooming detector for detecting a zoom position of said objective optical system;
- and
- (g) an adjuster for changing the finder view based on the temperature information, the object distance, and the zoom position of said objective optical system.
A camera comprising:
- a photographing optical system for forming an image of an object on a photosensitive plane;
- and
- a finder optical system for observing said object therethrough, wherein said system comprises:
- (a) an objective optical system having an imaging position;
- (b) an eyepiece optical system, which is capable of moving on an optical axis, for guiding light from the object via said objective optical system to an eye of an observer;
- (c) a visual field frame that is arranged on or near the imaging position;
- (d) a temperature detector for detecting temperature information;
- and
- (e) an adjuster for changing the imaging position of said objective optical system based on the temperature information.
A finder optical system comprising:
- an objective optical system having an imaging position;
- an eyepiece optical system, which is capable of moving on an optical axis, for guiding light from an object via said objective optical system to an eye of an observer;
- a visual field frame that is arranged so that said objective optical system forms an image inside said visual field frame;
- and
- means for changing a position of a lens of said objective optical system in accordance with a detected temperature.
Dependencies are inferred from the claim text.