Optical encoder

Details Optical encoder Optical encoder

2006-03-28

2006-03-28

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

Reexamination Certificate

active

07019282

ABSTRACT:
An optical encoder includes a scale having an optical grating formed thereon, a plurality of light-receiving devices, a light-emitting device, and a position-information detecting unit. The plurality of light-receiving devices is movable with respect to the scale. The light-emitting device applies light to the plurality of light-receiving devices through the scale. A position-information detecting unit detects position information in one cycle of a two-phase signal supplied from the light-receiving device. A determining unit determines an amplitude of an analog signal based on the position information.

REFERENCES:
patent: 5347355 (1994-09-01), Eguchi
patent: 2002/0122186 (2002-09-01), Igaki

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