Plane linear grating for optically encoding information

Details Plane linear grating for optically encoding information Plane linear grating for optically encoding information

1982-05-13

1985-07-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 250550, 350 371, G01D 534

Patent

active

045284482

ABSTRACT:
An encoding disk including a multiplicity of linear gratings placed accurately on the disk to diffract a light beam to a fixed point in space accurately does so independently of the centering of the disk on its axis of rotation.

REFERENCES:
patent: 3544800 (1970-12-01), Elliott
patent: 3796498 (1974-03-01), Post
patent: 4167666 (1979-09-01), Miller et al.

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