Optics: measuring and testing – Lamp beam direction or pattern
Reexamination Certificate
2005-02-08
2005-02-08
Stafira, Michael P. (Department: 2877)
Optics: measuring and testing
Lamp beam direction or pattern
Reexamination Certificate
active
06853445
ABSTRACT:
A device for detecting the direction of a light source. The device has a pin-hole lens that allows a collimated light beam to excite a light sensing surface behind the lens. The output from the light sensing surface is passed to a processor that determines the position of the surface that has been excited and the direction of the light source. When the position of one or more light sources is known, the device may further determine its own position. The devices may be used in a location system to provide known reference points to a network of other devices. The light sources may be modulated, in which the device can select or identify a particular light source based upon its modulation pattern.
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Lin Tzer-Hso
Patwari Neal K.
Perkins Matthew R.
Motorola Inc.
Stafira Michael P.
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