Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2007-11-20
2007-11-20
Epps, Georgia (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S231160, C250S23700G
Reexamination Certificate
active
11182410
ABSTRACT:
A position-measuring device includes: a measuring graduation provided on a measuring standard device arranged around in ring-like fashion; a scanning unit for optically scanning the measuring graduation using electromagnetic radiation; a scanning plate with a scanning graduation, formed by a scanning grating, extending along a detection axis, 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, whose detector surface is used for detecting the electromagnetic radiation after interaction with the scanning graduation and the measuring graduation and which is present as a stripe pattern, in order to record motions of the measuring standard device relative to the scanning unit. The grating constant of scanning graduation varies along the axis of extension of the scanning graduation such that the distances on which the phase of the stripe pattern present at the detector surface extends through a change by 2π, are constant.
REFERENCES:
patent: 4912322 (1990-03-01), Ichikawa et al.
patent: 4987302 (1991-01-01), Meyer et al.
patent: 5428445 (1995-06-01), Holzapfel
patent: 5471054 (1995-11-01), Watanabe
patent: 5739911 (1998-04-01), Holzapfel et al.
patent: 5994692 (1999-11-01), Holzapfel
patent: 6359691 (2002-03-01), Parriaux
patent: 6541761 (2003-04-01), Holzapfel et al.
patent: 6552810 (2003-04-01), Hermann et al.
patent: 6612048 (2003-09-01), Peterlechner et al.
patent: 6713756 (2004-03-01), Yamamoto et al.
patent: 2002/0153479 (2002-10-01), Kenjo et al.
patent: 2005/0061961 (2005-03-01), Tondorf et al.
patent: 2005/0116153 (2005-06-01), Hataguchi et al.
patent: 1 028 309 (2000-08-01), None
patent: 1 081 457 (2001-03-01), None
patent: 0 754 933 (2001-12-01), None
patent: WO 200138828 (2001-05-01), None
Dr. Johnannes Heidenhain GmbH
Epps Georgia
Kenyon & Kenyon LLP
Yealy Christopher M
LandOfFree
Position-measuring device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Position-measuring device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Position-measuring device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3887532