Method and apparatus using laser light for detecting the rotatio

Details Method and apparatus using laser light for detecting the rotatio Method and apparatus using laser light for detecting the rotatio

1991-11-27

1993-07-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356375, G01D 500, G01D 536

Patent

active

052312844

ABSTRACT:
In a position detecting method and an apparatus therefor, a signal processing circuit including a semiconductor laser, a light receiving element and the like is arranged on the outside of a servomotor. An article to be detected is arranged within the servomotor. The signal processing circuit and the article are connected to each other by a single or a plurality of optical fibers. A laser light is applied to surface properties formed inevitably at processing of a surface of the article, to produce a signal of a reflected light. The signal of the reflected light and a beforehand stored position signal of the article are compared with each other so as to be converted into a rotational-angle signal, thereby detecting a position of the article.

REFERENCES:
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patent: 4634862 (1987-01-01), Matsunaga et al.
patent: 4639595 (1987-01-01), Okita et al.
patent: 4679029 (1987-07-01), Krohn et al.
patent: 4751383 (1988-06-01), Ueyama
patent: 4947071 (1990-08-01), Clarke
patent: 4950079 (1990-08-01), McMurtry et al.
patent: 4952799 (1990-08-01), Loewen
patent: 4987299 (1991-01-01), Kobayashi et al.
patent: 5037206 (1991-08-01), Etzkorn et al.
patent: 5059901 (1991-10-01), Van Voorhis

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