Photometry system
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorsIsamu Hirai, Hideaki Tsuji
Life of this patent
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Abstract
A photometry system for a camera has a finder optical system for receiving light reflected by an object and for forming an image of the object on a finder field, the image corresponding to an image that is formed on a film surface. The photometry system also includes an indicator for projecting a predetermined image onto a predetermined area of the finder field: a photometric sensor that detects a brightness of the image formed on the finder field; and a controller which inhibits the indicator from projecting the predetermined image onto the finder field when the photometric sensor is detecting a brightness of a portion of the finder field which includes the predetermined area.
Claims25
A photometry system for a camera, said camera comprising:
- a finder optical system for receiving light from an object and for forming an image of said object on a finder field, said image corresponding to an image to be formed on a film surface;
- an indicator that produces a predetermined image;
- and
- means for projecting said predetermined image onto a predetermined area of said finder field,
- wherein said photometry system comprises:
- photometry means for detecting a brightness of said image formed on said finder field;
- and
- control means for inhibiting said projecting of said predetermined image for a period of time when said photometry means detects detecting a brightness of a predetermined portion of said finder field, said predetermined portion of said finder field including said predetermined area.
A photometry system for a camera, said camera comprising:
- a finder optical system for receiving light from an object and for forming an image of said object on a finder field, said image corresponding to an image to be formed on a film surface, said finder field being divided into a plurality of light detecting areas;
- an indicator that produces a predetermined image;
- and
- means for projecting said predetermined image onto a predetermined area of said finder field,
- wherein said photometry system comprises:
- a plurality of photometry sensors for detecting respective brightnesses of said plurality of light detecting areas;
- and
- calculation means for calculating a final brightness value of said plurality of photometry sensors, said brightnesses being weighted when said final brightness value is calculated, wherein a brightness of a light detecting area which is nearest to said predetermined area has a lower weighting than other light detecting areas.
A photometry system for a camera, said camera comprising:
- a finder optical system for receiving light from an object and for forming an image of said object on a finder field, said image corresponding to an image to be formed on a film surface;
- and
- means for projecting a predetermined image on said finder field,
- wherein said photometry system comprises:
- means for detecting a brightness level of an image formed on said finder field, said detecting means having a plurality of sensors, each of said plurality of sensors detecting a brightness level of a different area of said finder field,
- wherein said predetermined image is inhibited from being projected when a sensor that detects a brightness level of an area of said finder field where said image is projected is detecting a brightness of said area.
A camera, comprising:
- a finder optical system for receiving light from an object and for forming an image of said object on a finder field, said image corresponding to an image to be formed on a film surface;
- an indicator that produces a predetermined image;
- means for projecting said predetermined image onto a predetermined area of said finder field;
- a photometry system that detects a brightness of said image formed on said finder field;
- and
- a control system that inhibits said projecting of said predetermined image for a period of time when said photometry system detects a brightness of a portion of said finder field, said predetermined portion of said finder field including said predetermined area.
A camera, comprising:
- a finder field;
- a photometry system for obtaining a brightness measurement of an image in said finder field;
- an indicator that produces a predetermined image related to a photographing parameter of said camera;
- a projector system that projects said predetermined image onto said finder field;
- and
- an inhibiting system that inhibits said projecting of said predetermined image for a predetermined period of time in response to said photometry system obtaining a brightness measurement.
Dependencies are inferred from the claim text.