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MAGNETIC SUBSTANCE DETECTOR, IMAGE FORMING DEVICE OR DIGITAL COPYING MACHINE USING THE SAME, TONER CONCENTRATION DETECTOR, AND CONDUCTOR DETECTOR
MAGNETIC SUBSTANCE DETECTOR, IMAGE FORMING DEVICE OR DIGITAL COPYING MACHINE USING THE SAME, TONER CONCENTRATION DETECTOR, AND CONDUCTOR DETECTOR
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机译：磁性物质检测仪，使用该图像检测仪的图像形成设备或数字复印机，墨粉浓度检测仪和导体检测仪
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摘要
PROBLEM TO BE SOLVED: To stably carry out an operation for detecting a magnetic substance for a toner concentration or the like, and to enhance sensitivity for detecting the magnetic substance.;SOLUTION: In this magnetic substance detector for detecting the presence or a magnetic substance amount 26 of the magnetic substance by arranging the magnetic substance in a proximity region of a coil, the coil comprises the first coil L1 of the first resonant circuit and the second coil L2 of the second resonant circuit, a capacitor C3 of the first resonant circuit is used in common with the capacitor C3 for the second resonant circuit in common, a resonant frequency of the first resonant circuit is determined based on the first coil and the common capacitor, and a resonant frequency of the second resonant circuit is determined based on the second coil and the common capacitor, the resonant frequencies of the first and second resonant circuits are set substantially same, and a detection circuit comprising the first and second resonant circuits takes out and outputs a phase difference between an input side V1 and an output side V2 of the detection circuit, using the output from an oscillation circuit oscillating at a prescribed fixed frequency as its input.;COPYRIGHT: (C)2008,JPO&INPIT
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