Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1993-09-13
1995-02-28
Sikes, William L.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
2502034, 2502036, 2502061, G01J 120, G01S 3784
Patent
active
053939700
ABSTRACT:
A practical location tracking device provides cost-efficient methods for inputting three-dimensional location information. This device comprises light sources and light receiving elements. Each light receiving element comprises two or more closely spaced planar light detectors with their light receiving surfaces facing different spatial directions. Three dimensional location is determined by comparing the relative light intensities detected by those light detectors.
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patent: 4782328 (1988-11-01), Denlinger
patent: 5159322 (1992-10-01), Loebner
patent: 5166668 (1992-11-01), Aoyagi
Shau Jeng-Ge
Shau Jeng-Jye
Abraham Fetsum
Shau Jeng-Jye
Sikes William L.
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