Position measuring device including a scale having an...

Details Position measuring device including a scale having an... Position measuring device including a scale having an...

Filed on

2008-05-13

Date issued

2010-02-23

Examiner

Luu, Thanh X (Department: 2878)

Patent Class

Radiant energy

SubClass

Photocells; circuits and apparatus

SubSubClass

Optical or pre-photocell system

Other Related Categories

C250S231170, C341S013000

Type

Reexamination Certificate

Status

active

Patent number

07667188

Description

ABSTRACT:
A scale and a position-measuring device include the shifting of reference markings in graduation tracks, offset transversely with respect to the measuring direction, by fractions of the interval of the reference markings within a graduation track. It is thus possible to eliminate, or at least to markedly reduce, negative effects of the disturbance of the periodicity of a graduation track by the reference markings.

REFERENCES:
patent: 6995840 (2006-02-01), Hagler
patent: 2004/0218190 (2004-11-01), Holzapfel
patent: 103 19 609 (2004-11-01), None
patent: 1 400 778 (2004-03-01), None

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