Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1977-10-11
1979-06-05
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250227, G01N 2130
Patent
active
041574770
ABSTRACT:
A detector for detecting the position of the edges of a moving strip which produces an electrical signal proportional to the transverse position of the strip. A light source shines on the edge of the strip. A smooth surfaced sheet of translucent plastic material containing a fluorescent pigment is placed below the edge and opposite the light source. The pigment in the portion of the sheet of the strip and exposed to the light source outside the edge fluoresces producing light energy in amounts proportional to the area of the sheet exposed to the light source. This light energy travels between the sheet surfaces to the edges of the sheet. Photoelectric sensitive means are operatively associated with the edges of the sheet for producing an electrical signal proportional to the amount of fluorescent generated light energy which signal can be amplified to control power means for respositioning the strip.
REFERENCES:
patent: 2904700 (1959-09-01), Rockey
patent: 3659102 (1972-04-01), Toriyama
patent: 3752991 (1973-08-01), Slagle
patent: 3934148 (1976-01-01), Collins
Hoffman Alan R.
Kall Ronald J.
Nelms David C.
North American Mfg. Co.
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