Developer concentration detecting and replenishment device
AssigneeCanon Kabushiki Kaisha
InventorToru Takahashi
Life of this patent
Estimating the term…
Abstract
In a developer density adjusting device comprising concentration detector means for detecting the density of toner in a developer and concentration adjusting means for adjusting the toner to a proper concentration, the detector means is effective to detect the dielectric breakdown voltage of the developer to thereby detect the concentration of the developer and the concentration adjusting means is operable in response to a signal from the detector means.
Claims16
A developer replenishment device comprising means for detecting the concentration of toner in a developer, and adjusting the toner to a proper concentration in a developer;
- said detector means being effective to detect the concentration of toner in said developer by detecting the dielectric breakdown voltage of the developer, and said adjusting means being operable in response to a signal from said detector means, thereby maintaining the optimum mixture of carrier and toner of the developer.
A device for detecting concentration of a developer consisting of magnetic carrier and dielectric toner, comprising:
- means for conveying the developer;
- an electrode for detecting dielectric breakdown voltage of a magnetic brush which is formed with said developer at a surface of said conveyor means;
- and
- a circuit for generating a signal indicating the concentration of the developer in accordance with a signal produced by said electrode.
Dependencies are inferred from the claim text.