Optical location tracking devices

Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit

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Details

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.

REFERENCES:
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patent: 4225781 (1980-09-01), Hammons
patent: 4550250 (1985-10-01), Mueller et al.
patent: 4558313 (1985-12-01), Garwin et al.
patent: 4782328 (1988-11-01), Denlinger
patent: 5159322 (1992-10-01), Loebner
patent: 5166668 (1992-11-01), Aoyagi

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