Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2006-08-01
2006-08-01
Allen, Stephone B. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S231180, C356S616000
Reexamination Certificate
active
07084390
ABSTRACT:
A position-measuring device includes a measuring graduation extending along a measuring direction, a scanning unit for scanning the measuring graduation, and a detection device of the scanning unit including a plurality of detector elements that are arranged periodically one after the other along an extension direction and that, during scanning of the measuring graduation, generate output signals able to be supplied to an evaluation unit. In each case, a plurality of adjacent detector elements are interconnected to form a detector group such that their output signals are able to be joined and supplied as a unified signal to the evaluation unit. The detector elements are combined to form detector groups, and are arranged in the form of detector groups one after the other along the extension direction such that at least one defined harmonic is eliminated from the output signals.
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Dr. Johannes Heidenhain GmbH
Kenyon & Kenyon LLP
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