Optical rotary encoder

Details Optical rotary encoder Optical rotary encoder

2008-07-29

2008-07-29

Sohn, Seung C (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S23700G, C250S23700G, C356S615000

Reexamination Certificate

active

10599142

ABSTRACT:
An optical encoder includes: a rotary slit plate having a rotation angle detection track including an optical slit; a light source for applying light to the optical slit; light detecting elements for rotation angle detection and arranged at positions to which light emitted from the light source is applied to the optical slit, to detect the light emitted from the light source and passing through the optical slit; and light detecting elements for light amount monitoring arranged at locations on a circumference in corresponding relationship with positions to which light emitted from the light source is applied to the optical slit, to detect the light emitted from the light source and passing through the optical slit. The light detecting elements for light amount monitoring have an angular width that is an integer multiple of the angular interval of the light intensity distribution on surfaces of the light detecting elements for light amount monitoring.

REFERENCES:
patent: 6713756 (2004-03-01), Yamamoto et al.
patent: 58-106717 (1983-07-01), None
patent: 60-515 (1985-01-01), None
patent: 60-102520 (1985-06-01), None
patent: 6-294666 (1994-10-01), None
patent: 2002-340623 (2002-11-01), None

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