Electrophotography – Control of electrophotography process – Control of developing
Patent
1999-10-25
2000-11-28
Chen, Sophia S.
Electrophotography
Control of electrophotography process
Control of developing
399 61, G03G 1510
Patent
active
061546208
ABSTRACT:
A toner concentration measuring method and apparatus by which the concentration of toner in solvent can be detected accurately with a simple construction without being influenced by a variation of the conductivity caused by a variation of the amount of ions in the solvent. A stepped dc voltage is applied from a high dc voltage generation section between a pair of electrodes placed in solvent, and very weak current which flows in a circuit formed from the pair of electrodes is measured by a current measuring section. The solvent between the pair of electrodes is replaced into an equivalent circuit, and a capacitance of the equivalent circuit is calculated in accordance with a circuit equation to determine the amount of ions in the solvent. Further, in accordance with a function expression wherein the ion amount and a resistance of the equivalent circuit are used as parameters, a toner concentration from which an influence of a variation of the amount of ions in the solvent is eliminated is determined.
REFERENCES:
patent: 4257347 (1981-03-01), Stahl
patent: 5848322 (1998-12-01), Chen et al.
patent: 5995778 (1999-11-01), Yamaguchi
Chen Sophia S.
NEC Corporation
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