Attenuator for extraneous light fluctuations in a microscope wit

Details Attenuator for extraneous light fluctuations in a microscope wit Attenuator for extraneous light fluctuations in a microscope wit

1986-03-31

1987-12-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250229, G01J 132

Patent

active

047148233

ABSTRACT:
A sensor for determining image brightness in the viewing-ray path of a microscope is so utilized as (1) to control the intensity of light for object illumination and (2) to black out or darken the viewing-ray path while switching optical elements such as from one to a selected other of a plurality of turret-mounted objective lenses. The arrangement assures that an observer will not be dazzled by sudden brightness in the course of lens switching or in the course of switching from use of one to use of another of a plurality of contrasting methods.

REFERENCES:
patent: 3872302 (1975-03-01), Fender
patent: 4117375 (1978-09-01), Bachur et al.
patent: 4555620 (1985-11-01), Bridson et al.

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