Communications: electrical – Visual indication – Using light emitting diodes
Reexamination Certificate
2006-11-13
2010-11-23
Previl, Daniel (Department: 2612)
Communications: electrical
Visual indication
Using light emitting diodes
C340S815680, C340S815860
Reexamination Certificate
active
07839296
ABSTRACT:
A scale reading apparatus includes a readhead that is moveable relative to a scale. The readhead includes an incremental channel from which a series of reference mark pulses are produced as the readhead is moved relative to the scale. A reference mark channel is also provided that produce a reference mark gating pulse when the readhead passes a predetermined (absolute) position mark on the scale. An alignment detection unit monitors during use, phase alignment of the reference mark gating pulse and reference mark pulses. The alignment detection unit is arranged to monitor the phase of the leading and trailing edges of said reference mark gating pulse relative to the phase of the reference mark pulses. The apparatus may be used in position encoders and the like.
REFERENCES:
patent: 4479716 (1984-10-01), Nelle
patent: 4519140 (1985-05-01), Schmitt
patent: 5007177 (1991-04-01), Rieder et al.
patent: 5010655 (1991-04-01), Rieder et al.
patent: 5883298 (1999-03-01), Holzapfel et al.
patent: 6097490 (2000-08-01), Holzapfel et al.
patent: 6907372 (2005-06-01), Spanner
patent: 7089678 (2006-08-01), Novak et al.
patent: 7141780 (2006-11-01), Homer et al.
patent: 0 514 081 (1992-11-01), None
patent: 0 543 513 (1993-05-01), None
patent: 1 099 936 (2001-05-01), None
patent: 1 106 972 (2001-06-01), None
patent: WO 94/25830 (1994-11-01), None
patent: WO 02/065061 (2002-08-01), None
Oliff & Berridg,e PLC
Previl Daniel
Renishaw PLC
LandOfFree
Scale and readhead apparatus and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Scale and readhead apparatus and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Scale and readhead apparatus and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4230505