Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-06-19
1991-08-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022728, G01D 534
Patent
active
050380311
ABSTRACT:
An optical encoder comprising a photointerruptor having light-emitting and light-receiving optical fibers and a rotatable pulse scale disposed in an optical path between both of the opposed end faces of the optical fibers so as to shut the optical path intermittently, thereby generating optical pulses in accordance with an angle of rotation of the pulse scale, in which the light-receiving optical fiber has a larger diameter and a greater numerical aperture NA than those of the light-emitting fiber. The light-emitting optical fiber may be replaced with a light-emitting device. Further, a reflector may be interposed in the optical path. Optical pulse signals indicative of an angle of rotation can be detected effectively and it is possible to facilitate the assembling or wiring operation and reduce the production cost.
REFERENCES:
patent: 4096383 (1978-06-01), Mancini et al.
patent: 4536649 (1985-08-01), Kozai et al.
patent: 4981338 (1991-01-01), Bobb et al.
Hagihara Satoru
Imamura Fumitaka
Kurosawa Yoshi
Matsumura Masami
Sato Seiichi
Le Que T.
Mitsubishi Denki & Kabushiki Kaisha
Nelms David C.
Optec D.D. Melco Laboratory Co., Ltd.
Optec Dai-Ichi Denko Co., Ltd.
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