Scanning unit for a position measuring system for the...

Details Scanning unit for a position measuring system for the... Scanning unit for a position measuring system for the...

2006-03-29

2008-09-09

Punnoose, Roy M (Department: 2886)

Optics: measuring and testing

Position or displacement

Position transverse to viewing axis

C250S559290

Reexamination Certificate

active

07423768

ABSTRACT:
A scanning unit for a position measuring system for the optical scanning of a scale, the scanning unit including a light source for transmitting light in a direction toward a section of a scale and a detector for receiving light modified by the scale. A lens arrangement placed in front of the detector, the lens arrangement having a plurality of optical lenses and is used for generating a definite image of a scanned scanning area in an image field on the detector, wherein the lens arrangement optically images the scanning area reduced in surface in the image field on the detector.

REFERENCES:
patent: 5991040 (1999-11-01), Doemens et al.
patent: 2003/0016369 (2003-01-01), Benner et al.
patent: 2004/0227958 (2004-11-01), Benner et al.
patent: 2004/0246500 (2004-12-01), Holzapfel et al.
patent: 103 17 736 (2004-10-01), None
U.S. Appl. No. 10/821,518, filed Apr. 11, 2003, Holzapfel et al.

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