Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2007-10-23
2007-10-23
Epps, Georgia (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C356S498000, C345S166000
Reexamination Certificate
active
11129967
ABSTRACT:
One embodiment relates to an optical displacement sensor for sensing relative movement between a data input device and a surface by determining displacement of optical features in a succession of frames. The sensor includes an illuminator and a detector. The illuminator has a light source and illumination optics to illuminate a portion of the surface with a planar phase-front. The detector has a plurality of photosensitive elements and imaging optics. The illuminator and the detector are configured such that the illuminated portion of the surface is less than fifty percent larger than a field of view of the photosensitive elements of the detector. Other embodiments are also described.
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Carlisle Clinton B.
Lehoty David A.
Roxlo Charles B.
Trisnadi Jahja I.
Epps Georgia
Ko Tony
Okamoto & Benedicto LLP
Silicon Light Machines Corporation
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