Low-cost absolute linear optical encoder

Details Low-cost absolute linear optical encoder Low-cost absolute linear optical encoder

2007-02-20

2007-02-20

Williams, Howard L. (Department: 2819)

Coded data generation or conversion

Digital pattern reading type converter

Optical

C250S231160, C341S007000

Reexamination Certificate

active

10979280

ABSTRACT:
A Low-Cost Absolute Linear Optical Encoder (“LALOE”) for determining the absolute position of a read-head within the LALOE relative to a codestrip is disclosed. The LALOE may include an emitter module within the read-head, the emitter module having a plurality of light sources arranged in an light source pattern and a 90° Out-Of-Phase light source; and a detector module within the read-head, the detector module having a plurality of photo-detectors arranged in a photo-detector pattern corresponding to the light source pattern and a 90° Out-Of-Phase photo-detector corresponding to the 90° Out-Of-Phase light source.

REFERENCES:
patent: 4621256 (1986-11-01), Rusk
patent: 5068529 (1991-11-01), Ohno et al.
patent: 5563408 (1996-10-01), Matsumoto et al.
patent: 2005/0156104 (2005-07-01), Chong et al.

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