Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2005-11-08
2005-11-08
Porta, David (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S231140, C250S23700G, C341S013000
Reexamination Certificate
active
06963063
ABSTRACT:
A scale for a position encoder that includes a first graduation track having a first set of markings that are periodically arranged with a defined graduation period Δ, a second graduation track having a second set of markings that are periodically arranged with a defined graduation period Δ, wherein the second graduation track is shifted relative to the first graduation track by a distance Δ/4. A third graduation track having a third set of markings that are periodically arranged with a defined graduation period Δ, wherein the first, second and third graduation tracks are positioned such that at any one time at least one, but never three, of the first, second and third graduation tracks will transmit light directed upon the scale.
REFERENCES:
patent: 4184071 (1980-01-01), Fryer et al.
patent: 4731542 (1988-03-01), Doggett
patent: 5047631 (1991-09-01), Frese
patent: 5128536 (1992-07-01), Higashi
patent: 5917182 (1999-06-01), Ishizuka
patent: 5936236 (1999-08-01), Setbacken et al.
patent: 5998784 (1999-12-01), Venugopal et al.
Brinks Hofer Gilson & Lione
Ellis Suezu
Porta David
Renco Encoders Inc.
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