Reader for a scale marking

Details Reader for a scale marking Reader for a scale marking

2007-10-30

2007-10-30

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Digital pattern reading type converter

Optical

C341S014000

Reexamination Certificate

active

10561204

ABSTRACT:
The invention relates to a reference mark detector for use with a metrological scale or encoder (10) having a patterned reference mark rm movable relative to the reference mark detector. The detector may comprise a photodetector array (20) for detecting the patterned reference mark, the array comprising at least two sets of detector elements A and B each set being formed as a pattern which relates to the pattern of the reference mark. The two sets may be separate rows of photodectors or different elements of the same row of photodetectors. The pattern is preferably irregular.

REFERENCES:
patent: 4560870 (1985-12-01), Ramamurti
patent: 6051971 (2000-04-01), Holden
patent: 6392224 (2002-05-01), Holzapfel et al.
patent: 6452158 (2002-09-01), Whatley et al.
patent: 6816091 (2004-11-01), Chee
patent: 198 33 439 (1999-02-01), None
patent: 198 33-439 (1999-02-01), None
patent: WO 02/065061 (2002-08-01), None

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