Scanning device for scanning a scale graduation, and...

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

Reexamination Certificate

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Details

C356S614000

Reexamination Certificate

active

11046053

ABSTRACT:
A scanning device for scanning a scale graduation for detecting relative movements of the scanning device with respect to the scale graduation. The scanning device includes a first primary sensor field and a second primary sensor field used for detecting relative movements along a first spatial direction. A first secondary sensor field and a second secondary sensor field for detecting relative movements along a second spatial direction, which is linearly independent of the first spatial direction. The first primary sensor field, the second primary sensor field, the first secondary sensor field and the second secondary sensor field are arranged point-symmetrically in relation to a mid-point in a plane.

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patent: 6603114 (2003-08-01), Holzapfel et al.
patent: 6723980 (2004-04-01), Lee
patent: 2002/0018220 (2002-02-01), Aoki
patent: 2003/0104642 (2003-06-01), Ijichi et al.
patent: 195 27 287 (2000-06-01), None
patent: 100 54 376 (2001-06-01), None

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