Optics: measuring and testing – Position or displacement – Position transverse to viewing axis
Reexamination Certificate
2011-03-08
2011-03-08
Toatley, Gregory J (Department: 2877)
Optics: measuring and testing
Position or displacement
Position transverse to viewing axis
Reexamination Certificate
active
07903262
ABSTRACT:
A position measuring arrangement including a scale connected with a first object, wherein the scale includes a reference marking and a plurality of graduated areas, which are arranged a periodically in the measuring direction and have different optical properties. Respective additional structures are arranged in the measuring direction adjacent to the reference marking, which extend in the measuring direction and minimize secondary maxima in the reference pulse signal, wherein the additional structures includes at least two tracks having a first optical property, between which a graduated area having a second optical property and extending in the measuring direction is arranged. The position measuring arrangement further includes a scanning unit movable in relation to the scale in the measuring direction and is connected with a second object, the scanning unit includes individual detector elements, whose geometric arrangement is matched to the reference marking for generating the reference pulse signal.
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Gries Sebastian
Wagner Johannes
Brinks Hofer Gilson & Lione
Dr. Johannes Heidenhain GmbH
Toatley Gregory J
Underwood Jarreas C
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