Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-07-18
1988-03-08
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356376, G01B 1124
Patent
active
047301163
ABSTRACT:
A thickness measuring apparatus of a sheet-like product, wherein the sheet to be measured is supported by being partly rounded around a shaft while an light shading plate is positioned so as to form a slit between the shaft and the shaft side edge of the light shading plate, is able to measure the sheet thickness directly by scanning the slit width with a light beam or indirectly by comparing the scanned results of the light beam of this slit with that of a reference slit provided at the light shading plate so that, for instance, the thickness of magnetic material coated on a magnetic tape can be measured continuously in the production line thereof.
REFERENCES:
patent: 3518441 (1970-06-01), Selgin
patent: 4311392 (1982-01-01), Yazaki et al.
patent: 4532723 (1985-08-01), Kellie et al.
Ida Yoshiaki
Nagao Toshishige
Allen Stephone B.
Mitsubishi Denki & Kabushiki Kaisha
Nelms David C.
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