High performance reflectivity optical encoder with a...

Details High performance reflectivity optical encoder with a... High performance reflectivity optical encoder with a...

2008-01-08

2008-01-08

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S239000

Reexamination Certificate

active

07317183

ABSTRACT:
An optical encoder includes an emitter, a first lens, a detector, a second lens, and a protrusion. The emitter emits light which is directed by the first lens to a code scale for reflection. The reflected light is directed by the second lens to the detector. The detector detects the reflected light from the code scale. The protrusion is between the first lens and the second lens. The protrusion defines at least one surface that refracts stray light from the emitter away from the detector. Accordingly, the stray light does not reach the detector; thus the detector can operate more effectively.

REFERENCES:
patent: 4447143 (1984-05-01), Heitmann et al.

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