Apparatus useful for positioning a light filter

Details Apparatus useful for positioning a light filter Apparatus useful for positioning a light filter

1981-06-02

1983-12-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356418, G01J 300

Patent

active

044195753

ABSTRACT:
An apparatus useful for positioning a light filter includes an incrementally stepped motor having the light filter affixed thereto. The apparatus also includes means for detecting a light signal and incrementing the motor in response thereto.

REFERENCES:
patent: 3864037 (1975-02-01), Johnson

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