Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2007-01-09
2007-01-09
Allen, Stephone B. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S231140, C250S23700G, C356S614000, C356S616000
Reexamination Certificate
active
10488640
ABSTRACT:
In a position measuring system and a method for operating such a position measuring system, e.g., for the purpose of producing at least one reference pulse signal, the position measuring system includes a gauge with a track in which a periodic incremental scale is disposed and extends in one direction of measurement. The track displays a discontinuity with respect to an optical property in at least one defined reference position. The position measuring system further a scanner unit that may be displaced across a predetermined measuring length relative to the gauge in the direction of measurement and that is provided, in addition to a light source, with a plurality of detector elements for the photoelectric scanning of the incremental scale. In adjacent sections of the measuring length, the incremental scale has different transverse substructures that deflect incident ray beams in first and second directions in space. Reference pulse detectors are disposed in the various directions in space on the scanning unit end and are supplied with partial reference pulse signals or area signals which are processed to give the reference pulse signal.
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Holzapfel Wolfgang
Saendig Karsten
Allen Stephone B.
Dr. Johannes Heidenhain GmbH
Ellis Suezu
Kenyon & Kenyon LLP
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