SENSOR DEVICE, TONER CONCENTRATION DETECTION METHOD AND IMAGE FORMING APPARATUS,申请号US201615079995-传众专利搜索

SENSOR DEVICE, TONER CONCENTRATION DETECTION METHOD AND IMAGE FORMING APPARATUS

申请公布号：US2016291508(A1)

申请号：US201615079995

申请日期：2016.03.24

申请公布日期：2016.10.06

申请人：

KYOCERA Document Solutions Inc.

发明人：MASHIKI Masami

分类号：G03G15/08

主分类号：G03G15/08

地址：Osaka JP

摘要：The detection sensitivity of a variation in resonant frequency is increased, and thus a toner concentration is accurately detected. In a sensor device that includes an LC resonant circuit which outputs a pulse signal having a frequency corresponding to the toner concentration, a multiplier portion which multiplies the pulse signal output from the LC resonant circuit and a concentration detection portion which detects the toner concentration based on the pulse signal multiplied by the multiplier portion, the LC resonant circuit includes a detection coil and a capacitor and outputs a pulse signal having a frequency corresponding to the toner concentration. The multiplier portion multiplies the frequency of the pulse signal output from the LC resonant circuit. The concentration detection portion subtracts a predetermined offset pulse number from the pulse signal multiplied by the multiplier portion and detects the toner concentration based on the subtracted pulse number.

主权项：1. A sensor device that is accommodated in a development device and that detects a toner concentration of a two-component developer containing a carrier formed of a magnetic material and a toner, the sensor device comprising: an LC resonant circuit which includes a detection coil and a capacitor and which outputs a pulse signal having a frequency corresponding to the toner concentration; a multiplier portion which multiplies the pulse signal output from the LC resonant circuit; and a concentration detection portion which subtracts, in each of a plurality of sampling periods, a predetermined offset pulse number from the pulse signal multiplied by the multiplier portion and which detects the toner concentration based on the subtracted pulse number.