Electricity: measuring and testing – Magnetic – Fluid material examination
Patent
1978-04-18
1980-07-01
Corcoran, Robert J.
Electricity: measuring and testing
Magnetic
Fluid material examination
324236, 222DIG1, 222 57, 118689, 118712, 355 3DD, G01R 3300, G01N 900
Patent
active
042108640
ABSTRACT:
A powdered toner mixture comprising a non-magnetic toner component and a ferromagnetic carrier component is caused to flow downwardly through a vertical conduit by gravity. An electromagnetic coil is wound around the conduit and energized with an alternating electric signal. An electrically conductive and magnetic mass is disposed inside the conduit. The permeability of the toner mixture decreases as the toner density, or the ratio of the toner component to the carrier component, increases. The lower the permeability of the toner mixture, the greater the proportion of magnetic flux passing through the mass. The flux passing through the mass induces eddy currents therein which, in combination with hysterisis and skin effect losses, dissipate a portion of the electric signal. The amount of power dissipation is a function of the relative proportion of flux through the mass and thereby the toner density and, when measured, provides a measure of the toner density.
REFERENCES:
patent: 3572551 (1971-03-01), Gillespie et al.
patent: 3802381 (1974-04-01), O'Niell et al.
Miyakawa Seiichi
Ogata Yoshihiro
Sakamoto Koji
Tatsumi Susumu
Corcoran Robert J.
Jordan Frank J.
Ricoh & Company, Ltd.
Snow Walter E.
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