Coating apparatus – With vacuum or fluid pressure chamber
Patent
1977-04-25
1978-05-09
Stein, Mervin
Coating apparatus
With vacuum or fluid pressure chamber
118646, G03G 1509
Patent
active
040880923
ABSTRACT:
A coil is provided to a developing tank containing a toner mixture consisting of ferromagnetic carrier particles and non-magnetic toner particles in such a manner as to be magnetically coupled with the mixture. The coil constitutes a frequency determining element of an oscillator. The inductance of the coil and thereby the frequency of the oscillator vary in accordance with the toner density or proportion of the toner particles in the mixture. An FM demodulator comprising a phase locked loop produces an output signal having a magnitude corresponding to the oscillator frequency and thereby the toner density. An electrically actuated valve is opened to supply more toner particles to the mixture when the toner density drops below a predetermined value.
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Alexander David G.
Falik Andrew M.
Ricoh Co. Ltd.
Stein Mervin
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