Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2005-07-05
2005-07-05
Le, Que T. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S559290
Reexamination Certificate
active
06914235
ABSTRACT:
A position measuring system that includes a scale having a first track with successive partial areas of differing reflectivity and a second track with successive partial areas of differing reflectivity. A scanning unit which moves relative to the scale in a measuring direction so that a first position dependent scanning signal and a second position dependent scanning signal are generated by scanning the first track and the second track by the scanning unit. The first position dependent scanning signal and the second position dependent scanning signals have a different pitch behavior in case of a pitch tilt of either the scanning unit or the scale to the effect, that in that case the first position dependent scanning signal indicates an erroneous position, while the second position dependent scanning signal continues to show a correct position. The scanning unit has a structure such that a third position dependent scanning signal is generated from the first track and has a different pitch behavior than the first position measuring scanning signal generated from the first track.
REFERENCES:
patent: 3569723 (1971-03-01), Brake et al.
patent: 5883298 (1999-03-01), Holzapfel et al.
patent: 6229140 (2001-05-01), Ishizuka
patent: 6429940 (2002-08-01), Willhelm
patent: 6603114 (2003-08-01), Holzapfel et al.
patent: 2001/0001358 (2001-05-01), Ishizuka
patent: 2001/0017349 (2001-08-01), Holzapfel et al.
patent: 37 26 678 (1989-03-01), None
patent: 195 05 176 (1995-08-01), None
patent: 195 05 176 (1995-09-01), None
patent: 196 42 200 (1998-04-01), None
patent: 198 59 670 (2000-06-01), None
patent: 199 08 328 (2000-08-01), None
patent: 199 62 278 (2001-08-01), None
patent: 199 62 278 (2001-08-01), None
patent: 0 555 507 (1993-08-01), None
patent: 0 555 507 (1993-08-01), None
patent: 0 770 850 (1997-05-01), None
patent: 1 081 457 (2001-03-01), None
patent: 1111345 (2001-06-01), None
patent: 1 111 345 (2001-06-01), None
patent: 2 116 313 (1983-09-01), None
patent: 2 116 313 (1983-09-01), None
Benner Ulrich
Holzapfel Wolfgang
Brinks Hofer Gilson & Lione
Dr. Johannes Heidenhain GmbH
Le Que T.
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