Transmitter for governed-speed drives employing an optical grati

Details Transmitter for governed-speed drives employing an optical grati Transmitter for governed-speed drives employing an optical grati

1975-03-25

1976-11-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231SE, 324175, 356169, H01J 314

Patent

active

039951561

ABSTRACT:
A transmitter for determining the speed of rotation and the angular position of a rotating member, such as a shaft, in which a coding disc is driven synchronously with the shaft and has a series of circularly distributed light and dark areas which cooperate with two sections of alternating light and dark areas formed by a coding segment which is fixed relative to the disc. The pitch of the light and dark areas of the coding segment is equal to the pitch of the light and dark areas of the coding disc, respectively, and the light and dark areas of one section of the coding segment are staggered relative to the light and dark areas of the other section thereof. A light is passed towards the coding disc and the coding segment and at least one photosensitive receiver is in the path of the light passing through the light areas for generating an output signal.

REFERENCES:
patent: 3187187 (1965-06-01), Wingate
patent: 3309525 (1967-03-01), Johnson, Jr.
patent: 3454777 (1969-07-01), Marcus
patent: 3723748 (1973-03-01), Coburn et al.

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