Optical encoder having a light source scale and...

Details Optical encoder having a light source scale and... Optical encoder having a light source scale and...

2007-05-22

2007-05-22

Le, Que T. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S239000

Reexamination Certificate

active

10898912

ABSTRACT:
A reflective type optical encoder has a light source, a scale which moves relatively with respect to the light source and which has a periodic optical pattern, and a photodetector which can detect a change in an intensity pattern of a light beam that is emitted from the light source and is reflected and modulated by the scale. The photodetector and a concave portion are formed on a semiconductor substrate, the light source is disposed at the concave portion on the semiconductor substrate, a slit is also disposed on the concave portion, and the light beam emitted from the light source irradiates the scale after passing through the slit.

REFERENCES:
patent: 5666196 (1997-09-01), Ishii et al.
patent: 6603114 (2003-08-01), Holzapfel et al.
patent: 6713756 (2004-03-01), Yamamoto et al.
patent: 2000-193417 (2000-07-01), None
patent: 2002-542616 (2002-12-01), None
patent: 2003-130689 (2003-05-01), None

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