Automatic illumination control for multi-objective optical instr

Details Automatic illumination control for multi-objective optical instr Automatic illumination control for multi-objective optical instr

1983-01-11

1985-11-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

350526, G01J 132

Patent

active

045556202

ABSTRACT:
A multi-objective optical instrument, such as a microscope, has a photocell disposed in the optical path so as to effectively detect the intensity of light being transmitted by an illuminator to a receptor plane, such as defined by an operator's eyes. The light detected by the photocell is compared against a preset level of light. The intensity of the illumination would be adjusted automatically to a minimum level when the carrier is rotated and to a preselected level when an objective is in place for viewing. An electrical switch is cooperatively mounted to the rotatable objective carrier and detects rotation of the carrier to control the flow of current to the illuminator.

REFERENCES:
patent: 4163150 (1979-07-01), Stankewitz
patent: 4241251 (1980-12-01), Yonekubo
patent: 4384200 (1983-05-01), Taira

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