Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2005-03-15
2005-03-15
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C341S009000, C356S617000
Reexamination Certificate
active
06867412
ABSTRACT:
An absolute position-sensing device is usable to measure the relative position of two elements. An absolute scale includes an integrated track extending along a measuring axis of the scale. The integrated track includes a plurality of code portions interleaved with, or embedded in, a plurality of periodic portions. Each periodic portion includes a plurality of periodically-placed incremental scale elements. Each code portion includes a plurality of code elements indicative of an absolute measurement value. The code elements are arranged in code element zones along the direction perpendicular to the motion axis, and are detectable by associated variations along the direction perpendicular to the motion axis. The offset of the periodically placed elements relative to a readhead of the device is combined with the absolute measurement value to determine an absolute position.
REFERENCES:
patent: 3882482 (1975-05-01), Green et al.
patent: 4106481 (1978-08-01), van Kuijk
patent: 4519140 (1985-05-01), Schmitt
patent: 4631519 (1986-12-01), Johnston
patent: 4717824 (1988-01-01), Sakamoto et al.
patent: 5235181 (1993-08-01), Durana et al.
patent: 5279044 (1994-01-01), Bremer
patent: 5825307 (1998-10-01), Titus et al.
patent: 5886519 (1999-03-01), Masreliez et al.
patent: 5965879 (1999-10-01), Leviton
patent: 05-172586 (1993-09-01), None
Atherton Kim W.
Patzwald Andrew M.
Luu Thanh X.
Mitutoyo Corporation
Yam Stephen
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