Absolute position length-measurement type encoder

Details Absolute position length-measurement type encoder Absolute position length-measurement type encoder

2008-04-09

2010-11-02

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S231130, C250S231140, C356S616000, C033S0010PT

Reexamination Certificate

active

07825368

ABSTRACT:
An absolute position length-measurement type encoder includes a scale having an incremental track, an absolute track, and a reference position track. The incremental track has incremental patterns including first light and dark patterns formed at equal intervals in first periods. The absolute track has absolute patterns representing an absolute position. The reference position track has reference position patterns including second light and dark patterns formed at equal intervals in second periods longer than the first periods. A light source emits a measurement light to the scale. A photodetector receives the measurement light reflected at or transmitted through the scale. A signal processing circuit processes the received light signal of the photodetector to detect an absolute position of the scale.

REFERENCES:
patent: 5129725 (1992-07-01), Ishizuka et al.
patent: 0331828 (1989-09-01), None
patent: 0577104 (1994-01-01), None
patent: 07-286861 (1995-10-01), None
patent: 97/40345 (1997-10-01), None

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