Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2006-12-05
2006-12-05
Epps, Georgia (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C356S616000, C250S231140, C250S23700G
Reexamination Certificate
active
07145126
ABSTRACT:
An optical device that includes a grating (for example a moving reflective grating) and a light source disposed opposing a predetermined side of the grating. The optical device also includes a first reference grating (e.g., a fixed grating) disposed between the light source and the grating, a detector disposed opposing the predetermined side of the grating and a second reference grating (e.g., a fixed grating) disposed between the detector and the grating. The grating, first reference grating and light source are configured for movement relative to one another. For example, the grating can be moveable while the light source and first reference grating are fixed.
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J. Willhelm: “Dreigitterschrittgeber” 1978, Technische Universität Hannover, XP002327534, pp. 28-51.
Epps Georgia
Livedalen Brian
Townsend and Townsend / and Crew LLP
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