Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1979-10-03
1981-05-26
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
350 66, H01J 314
Patent
active
042700485
ABSTRACT:
Apparatus for receiving electromagnetic radient energy is disclosed, inclng a radiation detection element, a movable optical element for directing the radiation toward the detection element, and a drive system for automatically adjusting the position of the optical element to cause the radiation to always be directed toward the detection element. The drive system includes a pivotally mounted permanent magnet connected with the optical element, a plurality of coils arranged circumferentially about the magnet, and radiation-responsive control circuit for selectively energizing the coils to produce a magnetic field that displaces the magnet and the optical element to maintain direction of the radiation upon the radiation detection element.
REFERENCES:
patent: 4039246 (1977-08-01), Voigt
patent: 4161652 (1979-07-01), Moreau et al.
patent: 4175832 (1979-11-01), Umeki et al.
Deutsche Forschungs-und-Versuchsanstalt fur Luft-und Raumfahrt e
Nelms David C.
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