Optical projection encoder with patterned mask

Details Optical projection encoder with patterned mask Optical projection encoder with patterned mask

2008-05-27

2008-05-27

Monbleau, Davienne (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231140, C250S221000, C250S222100, C356S391000, C356S397000, C356S616000

Reexamination Certificate

active

07378643

ABSTRACT:
An Optical Projecting Encoder (“OPE”) having an emitter module for transmitting emitted optical radiation through a mask to a moving object, and a detector module for receiving reflected optical radiation from the moving object. The reflected optical radiation from the moving object may include a predetermined image cast by the mask and a surface texture image from the moving object. The OPE may include a transmissive layer covering both the emitter module and the detector module, where the transmissive layer covering the emitter module collimates the optical radiation from the emitter module, and the transmissive layer covering the detector module concentrates the optical radiation reflected from the moving object to the detector module. The detector module may include an optical navigation sensor that continuously acquires and compares predetermined images cast by the mask and surface texture images from the moving object.

REFERENCES:
patent: 4034230 (1977-07-01), Brill et al.
patent: 5644139 (1997-07-01), Allen et al.
patent: 6246050 (2001-06-01), Tullis et al.
patent: 7102122 (2006-09-01), Ornellas et al.
patent: 2005/0073693 (2005-04-01), DePue et al.

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