Position-measuring device

Details Position-measuring device Position-measuring device

2007-09-18

2007-09-18

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

Position or displacement

C356S499000, C250S231130, C250S23700G, C250S559290

Reexamination Certificate

active

10946872

ABSTRACT:
A position-measuring device includes: a measuring graduation provided on a material measure going around in ring-like fashion; a scanning unit for optically scanning the measuring graduation using electromagnetic radiation; a scanning plate with a periodic scanning graduation which is arranged in the beam path of the electromagnetic radiation used for scanning the measuring graduation, so that the radiation interacts both with the scanning graduation and with the measuring graduation; and a detector of the scanning unit, the detector surface of which is used for detecting the electromagnetic radiation after interaction with the scanning graduation and the measuring graduation and which is arranged with a period (PD) for detecting electromagnetic radiation in the form of a stripe pattern. The period PMof the measuring graduation and the period PAof the scanning graduation may be coordinated so that 1/(1/PA−1/PM)<PD.

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“Search and Examination Report,” Singapore Patent Application No. 200407930-7, dated Jan. 17, 2007.

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