Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1993-10-04
1995-06-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214PR, 25023113, H01J 4014
Patent
active
054282179
ABSTRACT:
The present invention relates to an optical rotary encoder for detecting a position optically. In the optical rotary encoder of the invention, a light beam reflected by a half mirror enters a deflector, whereby it is reflected while being deflected in a certain direction. The reflected light beam again enters the half mirror. Transmitted light from the half mirror enters a position detector, in which a light spot is formed on an annular photodiode. The path of the reflected light from the deflector forms a cone having a vertical angle which is twice the angle of deflection of the deflector. The position detector is disposed perpendicularly to the optical axis of the reflected light in the case of the deflection angle being 0.degree. and with the center of the annular photodiode made coincident with the said optical axis. A suitable distance between the deflector and the photodiode is selected so that a light spot is radiated onto the photodiode. The position of the light spot formed on the annular photodiode is in a corresponding relation to a rotational angle of a rotating shaft. The position detector detects the position of the light spot to detect such rotational angle.
REFERENCES:
patent: 3129416 (1964-04-01), Freedman
patent: 4760436 (1988-07-01), Yi Zi
Shadan Hojin, "Optical Application Technique 1991, III-1", Optoelectro-mechanics Association, Apr. 30, 1991, pp. 16-17.
M. Idesawa, "Multi-Resolution Position Sensing with R-HPSD Scheme and Surface Shape Measuring Method", The 3rd Robot Senser Symposium, Yunnan Institute of Technology, Jan. 17-18, 1992, pp. 123-128.
Nakajima Hajime
Shikai Masahiro
Mitsubishi Denki & Kabushiki Kaisha
Nelms David C.
Nichols Steven L.
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