G - Physics – 03 – G
Patent
G - Physics
03
G
340/142, 314/37
G03G 21/00 (2006.01) G03G 15/08 (2006.01)
Patent
CA 1111491
ABSTRACT OF THE DISCLOSURE Disclosed is a device for measuring the concen- tration of toner in a developer mixture composed of toner and a ferromagnetic carrier material, e.g., in an electro- photographic developing device. The device comprises a measuring oscillator which comprises an inductance-includ- ing component comprising at least one coil wherein the conductor paths of the coil lie substantially in one plane; means for passing at least a portion of the developer mixture into the zone of the inductance; and meals for evaluating changes in the frequency of the oscillator resulting from changes in the developer mixture composition passing over the zone of inductance. Also disclosed is an electro-photographic copying apparatus embodying the foregoing device.
305632
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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