Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2007-11-19
2010-12-28
Pyo, Kevin (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S231140, C356S616000, C341S013000, C033S707000
Reexamination Certificate
active
07858922
ABSTRACT:
A position-measuring device includes a scanning unit and a measuring graduation that is displaceable thereto in at least one measuring direction. The measuring graduation includes two incremental-graduation tracks extending in parallel in the measuring direction, between which a reference-marking track having at least one reference marking at a reference position extends. The scanning unit includes a first scanning device for generating the reference-pulse signal and a second scanning device for generating the incremental signals. To generate the incremental signals, a scanning beam acts at least once upon each incremental graduation in an incremental-signal scanning field.
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Hermann Michael
Holzapfel Wolfgang
Saendig Karsten
Dr. Johannes Heidenhain GmbH
Kenyon & Kenyon LLP
Pyo Kevin
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