Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1983-03-21
1985-11-26
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, 340347P, G01D 534
Patent
active
045556253
ABSTRACT:
Disclosed is a highly precise encoding structure utilizing incremental or absolute encoding techniques. The drum configuration allows the use of less expensive materials and the capability to manufacture such a device in a labor-saving and therefore less expensive manner. This is accomplished, in part, by utilizing drums having differing radius measurements, thereby requiring a simpler gearing interrelationship between the plurality of drums. Furthermore, in one embodiment, drums of differing sizes may be installed one inside the other in a space-saving configuration.
REFERENCES:
patent: 3808431 (1974-04-01), Hedrick
patent: 4025914 (1977-05-01), Akita
patent: 4201911 (1980-05-01), Dering
patent: 4240066 (1980-12-01), Lenox
patent: 4384204 (1983-05-01), Tamaki et al.
Cascini Michael R.
Mosier Donald E.
Gatto James
Hamann H. Fredrick
Mayes Robert C.
Montanye George A.
Nelms David C.
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