Optical position measuring arrangement

Details Optical position measuring arrangement Optical position measuring arrangement

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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