Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-12-26
1991-10-15
Willis, Davis L.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, 25023116, G01D 534
Patent
active
050576852
ABSTRACT:
A rotation detector includes a rotary disk in which slits are recorded, and a photodetector for reading the slits with a laser beam. The slits is constituted by concave and convex parts having different widths radially formed on one surface of the rotary disk at different intervals. The width of one of the concave and convex parts constituting the slits which has a smaller width or slit interval is set to be smaller than the spot size of the laser beam.
REFERENCES:
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patent: 4222070 (1980-09-01), Howe et al.
patent: 4406939 (1983-09-01), Golker
patent: 4644156 (1987-02-01), Takahashi et al.
patent: 4689485 (1987-08-01), McMurtry
patent: 4725723 (1988-02-01), Shimojima
patent: 4757196 (1988-07-01), Yamada et al.
patent: 4780610 (1988-10-01), Abe
patent: 4833316 (1989-05-01), Yoneda
Patent Abstracts of Japan, vol. 10, No. 387 (P-530) (2444) Dec. 25, 1986, & JP-A-61-176817 (Foster Denki K.K.) Aug. 8, 1986.
Patent Abstracts of Japan, vol. 6, No. 252 (P-161) (1130) Dec. 10, 1982, & JP-A-57 149912 (Nippon Denshin Denwa Kosha) Sep. 16, 1982.
Kurosawa Ryoichi
Taira Kozo
Kabushiki Kaisha Toshiba
Messinger Michael
Willis Davis L.
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