Encoder

Details Encoder Encoder

2006-06-30

2008-08-12

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Digital pattern reading type converter

Antiambiguity feature

C341S050000, C341S051000

Reexamination Certificate

active

07411520

ABSTRACT:
An encoder has a scale having an optical, magnetic or electrostatic displacement detection pattern. An encoder head detects the displacement detection pattern and generates at least two periodic signals that differ in phase, thereby to determine a displacement with respect to the scale. A center-voltage detecting unit detects only the center voltage of each periodic signal. A reference-voltage adjusting unit adjusts the center voltage detected by the center-voltage detecting unit to a predetermined reference voltage.

REFERENCES:
patent: 5299143 (1994-03-01), Hellinga et al.
patent: 5949051 (1999-09-01), Kiriyama
patent: 6437723 (2002-08-01), Otsuka et al.
patent: 2001-56238 (2001-02-01), None

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