Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-05-01
1994-06-28
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022721, G01D 534
Patent
active
053249348
ABSTRACT:
Position, velocity and direction of movement of a linear motor is determined by a fiberoptic encoder comprised of first and second fiberoptic bundles. The first ends of each of the bundles have their fibers arranged within a narrow elongated slit, the fibers of each bundle being distributed substantially along the entire length of the slit and further so that the fibers of the bundles are substantially interspersed with one another along said slit. One of the bundles conveys light directed upon the opposite end of the bundle to a surface adjacent said slit and along which the linear motor is moving. The remaining bundle conveys light reflected from the surface to a sensor which converts the intensity of the reflected light into an electrical signal. Changes in the reflectivity of the surface, which may be the etched stator of a linear motor system are utilized to determine the position of the linear motor along the stator. The direction of movement is determined through the utilization of a pair of encoders of the type described wherein the slits of each encoder are arranged in spaced parallel fashion, the spacing being related to the spacing of the pattern on the etched stator to obtain motion and direction detection. Use of a plurality of pairs of encoders having the aforesaid arrangements provides for position, acceleration velocity and direction detection as well as rotation detection.
REFERENCES:
patent: 3297879 (1967-01-01), Meyer
patent: 3622793 (1971-11-01), Dalton et al.
patent: 4096383 (1978-06-01), Mancini et al.
patent: 4147977 (1979-04-01), Dimmick
patent: 4278881 (1981-07-01), Mann
patent: 4356395 (1982-10-01), Miller
patent: 4387299 (1983-06-01), Akiyama
patent: 4536649 (1985-08-01), Kozai
patent: 4631401 (1986-12-01), Parkhurst
patent: 4659924 (1987-04-01), Tokunga
patent: 4704523 (1987-11-01), Uchida
patent: 4795913 (1989-01-01), Blessing et al.
patent: 4823062 (1989-04-01), Hoffman et al.
patent: 4890241 (1989-12-01), Hoffman et al.
patent: 4953933 (1990-09-01), Asmar
patent: 4972080 (1990-11-01), Taniguchi
patent: 5148020 (1992-09-01), Machida
Megamation Incorporated
Nelms David C.
Shami K.
Weinstein Louis
LandOfFree
Fiberoptic encoder for linear motors and the like does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fiberoptic encoder for linear motors and the like, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fiberoptic encoder for linear motors and the like will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2378776