Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1988-06-09
1990-07-17
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
126425, G01J 120
Patent
active
049422928
ABSTRACT:
In apparatus for following sun light, at least two pairs of diametrically facing light-receiving elements (30a, 30c and 30b, 30d) are provided along the periphery of a circular end plane of incidence (24) of an optical fiber cable (20) where sun light is condensed by way of a lens 14. The deviation of a condensed light area from the circular end plane of incidence (24) will be effectively detected by the light-receiving elements to control a drive unit (46) which drives an equatorial (18) carrying an optical system including the lens (14) and the end plane of incidence (24) of the optical fiber cable (20). In one embodiment, another light-receiving element (50i) is provided at the center of the end plane of incidence (24) to detect when light condensing area is deviated to a great extent. The output signal of this light-receiving element (50i) is used to perform speed control of the drive unit (46). In another embodiment, a circuit arrangement for detecting abnormal state of the optical system is also used.
REFERENCES:
patent: 4107521 (1978-08-01), Winders
patent: 4290411 (1981-09-01), Russell
patent: 4447718 (1984-05-01), Mori
patent: 4740682 (1988-04-01), Frankel
Fuse Masaki
Ichimura Kiyoshi
Ito Kideaki
Suematsu Chiaki
Suzuki Shingo
Mitsubishi Rayon Co. Ltd.
Nelms David C.
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