Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-12-07
1994-05-03
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356219, H01J 314
Patent
active
053089723
ABSTRACT:
An apparatus for photographing an image of a sample observed through a microscope comprises a photometry region designating unit, an optical member for superimposing an image of an indicator light beam on an image of an object light beam, an area sensor, a reflecting member for reflecting the object light beam and the indicator light beam and guiding them to the area sensor, a photometry region determining unit, a photometry unit, and a photographing unit. The photometry region designating unit generates an indicator light beam which is movable in a plane perpendicular to the optical axis of the object light beam output from an objective lens. The photometry region determining unit stores a photometry signal supplied from the area sensor in correspondence with a position of a light receiving plane, detects the position of the light receiving plane, on which the indicator light is projected, by using the photometry signal, and determines a photometry region based on the detected position. The photometry unit measures the brightness of the photometry region determined by the photometry region determining unit and calculates a photometry value. The photographing unit photographs an image of the sample based on the photometry value.
REFERENCES:
patent: 3851949 (1974-12-01), Kraft et al.
patent: 4527869 (1985-09-01), Nihoshi
patent: 4586188 (1986-02-01), Weber et al.
Nagano Takashi
Takahashi Toru
Nelms David C.
Olympus Optical Co,. Ltd.
Shami K.
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