Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-09-09
1993-12-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250214PR, 324160, G01D 534
Patent
active
052723356
ABSTRACT:
An object of this invention is to provide a position detecting apparatus which can accurately detect an angle of rotation of a rotary board mounted on a rotary shaft even if the former is not coaxial with the latter, or there is a play between the rotary shaft and its bearing. In a position detecting apparatus, a detecting transparent slit is formed in it in such a manner that the distance between the slit and the center of rotation of the rotary board changes with the angle of rotation .theta. of the rotary board, and a reference transparent slit having a predetermined radius is also formed in it. LEDs are arranged on one side of the rotary board, and PSDs are arranged on the other side of the rotary board in such a manner the formers are confronted through the transparent slits with the PSDs, respectively. The PSDs detect light beams passed through the transparent slits, to output light reception signals. The difference between those light reception signals is calculated to obtain the relative distance thereof to detect the angle of rotation .theta. of the rotary board. Hence, even if the rotary board is not coaxial with the rotary shaft, or there is a play between the rotary shaft and its bearing, the angle of rotation .theta. of the rotary board can be detected with high accuracy.
REFERENCES:
patent: 2989642 (1961-06-01), Svec
patent: 4902885 (1990-02-01), Kojima et al.
patent: 4928009 (1990-05-01), Ikebe et al.
patent: 4977316 (1990-12-01), Malcolm et al.
patent: 5012188 (1991-04-01), Kubo et al.
Patent Abstracts of Japan: vol. 10, No. 300, p. 506, Oct. 14, 1986, Japan Publication No. JP 61 117 414, dated Jun. 4, 1986.
Patent Abstracts of Japan; vol. 10, No. 93, p. 445, Apr. 10, 1986, Japan Publication No. JP 60 227 112, dated Nov. 12, 1985.
European Search Report dated Jan. 11, 1993.
Kabushiki Kaisha Tokai Rika Denki Seisakusho
Le Que T.
Nelms David C.
LandOfFree
Eccentricity-compensated position detecting apparatus having an does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Eccentricity-compensated position detecting apparatus having an , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Eccentricity-compensated position detecting apparatus having an will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-310647