Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2007-12-25
2007-12-25
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
Reexamination Certificate
active
11210122
ABSTRACT:
An optical position measuring system that includes a measuring graduation and a scanning unit that is movable in relation to the measuring graduation in a measuring direction. The scanning unit includes a light source that generates light towards the measuring graduation so that scanning signals result from an interaction of the light with the measuring graduation and an opto-electronic detector arrangement has a plurality of detector element units, whose geometric shape and/or arrangement has been selected in such a way that through them at least a partial filtering of undesired harmonics out of the scanning signals results. The measuring graduation includes an arrangement of graduation areas with different optical properties, which is periodic in the measuring direction and has a periodicity TPM and which has been selected in such a way that through them at least a partial filtering of undesired harmonics out of the scanning signals results.
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Brinks Hofer Gilson & Lione
Dr. Johannes Heidenhain GmbH
Luu Thanh X.
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