Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-08-21
1991-01-08
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25023116, H01J 314
Patent
active
049838288
ABSTRACT:
The invention provides an opto-electronic scale reading apparatus comprising a read head in which a plurality of optical emitter and receiver pairs are arranged so that beams of collimated light generated by the respective emitters fall on a common region of a scale. Compared to arrangements where the light beams fall on separate regions of the scale, the apparatus according to the invention is relatively immune to the effects of certain misalignments between the scale and the read head.
REFERENCES:
patent: 3344700 (1967-10-01), Brake
patent: 3586665 (1971-06-01), Weyrauch
patent: 4079252 (1978-03-01), Brake
patent: 4115008 (1978-09-01), Shepherd
patent: 4152589 (1979-05-01), Mitchell
patent: 4222633 (1980-09-01), Hock
patent: 4311389 (1982-01-01), Fay et al.
patent: 4369366 (1983-01-01), Schmitt
patent: 4461083 (1984-07-01), Ernst
patent: 4472629 (1984-09-01), Ort
patent: 4722600 (1988-02-01), Chiang
patent: 4722605 (1988-02-01), Livnat et al.
Japan Abstracts, Optical Scale Reader, Appln No. 59-10661, 1/1984.
"Interference-Generated Moire Fringes in a System of Three Reflection Gratings", Kulindzhi et al., Optical Tech., vol. 38, No. 10, Oct. 1971.
Nelms David C.
Renishaw plc
LandOfFree
Opto electronic scale reading apparatus wherein each of a plural does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Opto electronic scale reading apparatus wherein each of a plural, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Opto electronic scale reading apparatus wherein each of a plural will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-936426