Optical encoder and output adjustment for the same

Details Optical encoder and output adjustment for the same Optical encoder and output adjustment for the same

2006-06-06

2006-06-06

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

Reexamination Certificate

active

07057160

ABSTRACT:
An optical encoder comprises a light source unit, a scale which has a periodic optical pattern and displaces relatively to the light source unit, and a light detector to detect a light beam emitted from a light source of the light source unit and traveled by way of the scale. The light source unit has a light beam exit opening through which a light beam is emitted toward the scale. Assuming that z1is a distance between the light beam exit opening and the scale, z2is a distance between the scale and the light detector, and p1is a pitch of the periodic optical pattern of the scale, the width W of the light beam exit opening in the scale moving direction is determined depending on the values of z1, z2, and p1.

REFERENCES:
patent: 5026164 (1991-06-01), Ichikawa
patent: 2002/0014581 (2002-02-01), Yamamoto et al.
patent: 2005/0157307 (2005-07-01), Yamamoto et al.
patent: 2002-48602 (2002-02-01), None

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