Reflective encoder with three-dimensional code carrier

Details Reflective encoder with three-dimensional code carrier Reflective encoder with three-dimensional code carrier

2008-04-15

2008-04-15

Le, Que Tan (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231160, C356S616000

Reexamination Certificate

active

11369287

ABSTRACT:
An encoder having a code pattern on a carrier and an emitter detector module is disclosed. The code pattern includes alternating reflective and opaque regions on a carrier that includes a planar surface. The emitter-detector module includes a light source that generates light and directs a portion of the generated light at the first side of the carrier and a first detector that detects light reflected from one of the reflective regions. The reflective regions include a three-dimensional element for directing light from the light source onto the first detector. The element has a surface that is inclined at an oblique angle with respect to the planar surface. The code pattern moves with respect to the emitter-detector module. The three-dimensional element can include a reflective imaging element that images the light source onto a surface of the first detector.

REFERENCES:
patent: 4806751 (1989-02-01), Abe et al.
patent: 6232593 (2001-05-01), Taniguchi et al.
patent: 6639206 (2003-10-01), Rothamel et al.
patent: 7089672 (2006-08-01), Noltemeyer

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