Photoelectric encoder, scale and method of manufacturing scale

Details Photoelectric encoder, scale and method of manufacturing scale Photoelectric encoder, scale and method of manufacturing scale

2007-10-25

2009-11-17

Epps, Georgia Y (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C341S013000

Reexamination Certificate

active

07619208

ABSTRACT:
A photoelectric encoder includes: a scale having a grating formed thereon along a measuring axis; a light source operative to emit light to the scale so as to form a light spot on the grating; and a photoreceiver operative to receive reflected light from the scale. The light source and the photoreceiver are disposed so as to be allowed to move relative to the scale at least in a direction along the measuring axis. The light source emits the light to the scale so that the photoreceiver receives the reflected light by the scale. The light source emits light with different wavelengths. The scale includes a plurality of reflection portions that respectively reflect the light with different wavelengths.

REFERENCES:
patent: 4774494 (1988-09-01), Extance et al.
patent: 5216245 (1993-06-01), Keegan et al.
patent: 0 498 904 (1992-08-01), None
patent: A-10-163549 (1998-06-01), None
patent: WO 2006/109020 (2006-10-01), None

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