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US 5,393,970 AGranted
Optical location tracking devices
AssigneeJeng-Jye Shau
InventorsJeng-Ge Shau, Jeng-Jye Shau
Life of this patent
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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.
Claims6
An optical location tracking device comprises one or more light sources and two or more light detectors;
- said light detector comprises a light receiving plane and a light sensor;
- the output of said light sensor is dependent on the incident angle of the light beams reaching said light receiving plane;
- the location of said light sources are determined by the outputs of said light sensors from said angular dependence of said light detector.
Dependencies are inferred from the claim text.