Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2004-01-15
2008-03-25
Lee, Patrick J. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S231140, C250S231180, C356S614000, C033S0010PT, C341S013000
Reexamination Certificate
active
07348543
ABSTRACT:
An optical encoder assembly and a method for measuring a rotation angle in which optical beams are spread over the circumference of a rotating optical disk by means of optical guides (OG). In the preferred embodiment the rotating optical disk has a pair of concentrically arranged circular patterns with alternating transparent and opaque sections. Each beam is input via optical fibers to one of a pair of concentrically disposed OGs with a cylindrical shape (COGs) respectively and propagated through the optical disk to be reflected by a mirror with two concentrically disposed circular patterns of reflective and non reflective sections, reentering the COG through the optical disk in a reverse direction. The COGs then guide the light beams back to an electronic interface that converts the optical signals into electronic signals producing position information. Considerably elevated precision can be obtained due to the averaging of the light intensity going through the disk on a substantially large part of the optical disk.
REFERENCES:
patent: 3410976 (1968-11-01), Watson
patent: 4268747 (1981-05-01), Becchi et al.
patent: 4291976 (1981-09-01), McMahon
patent: 4410798 (1983-10-01), Breslow
patent: 4475034 (1984-10-01), Maddox et al.
patent: 5129725 (1992-07-01), Ishizuka et al.
patent: 5981941 (1999-11-01), Takata et al.
patent: 6054938 (2000-04-01), Nakajima et al.
patent: 6208788 (2001-03-01), Nosov
patent: 6844542 (2005-01-01), Kirschbaum et al.
patent: 2003/0108295 (2003-06-01), Huang
patent: 1259621 (1968-01-01), None
patent: 2155970 (1972-08-01), None
patent: 3133401 (1982-07-01), None
patent: 0646796 (1995-04-01), None
patent: 2201527 (1988-09-01), None
patent: 2271031 (1994-03-01), None
patent: 2003 090920 (2003-03-01), None
patent: WO 00/67057 (2000-11-01), None
AlphaPatent Associates Ltd.
Lee Patrick J.
Swirsky Daniel J.
Yaskawa Eshed Technologies Ltd.
LandOfFree
Optical encoder with hollow light guide for indicating the... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical encoder with hollow light guide for indicating the..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical encoder with hollow light guide for indicating the... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3975934