Sheet thickness measuring apparatus by optical scanning

Details Sheet thickness measuring apparatus by optical scanning Sheet thickness measuring apparatus by optical scanning

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.

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