Patent ID: 9069285
Filing Date: 2015-06-30
Classification: G03G

Abstract:
1. A detection device for detecting a charge amount of toner on a developing material carrier, the device comprising: an assembly including a quartz oscillator and a first electrode and a second electrode attached to the quartz oscillator; a first capacitor connected in series to the assembly; a first switch provided between the assembly and the first capacitor; a second capacitor connected in parallel with the assembly; a second switch connected in parallel with the assembly and connected in series to the second capacitor; a controller configured to control the first switch and the second switch; a first detection unit configured to detect a potential difference between both ends of the first capacitor; and a second detection unit configured to detect an oscillation frequency of the quartz oscillator, wherein in the case where the toner on the developing material carrier is caused to adhere to the first electrode, the controller is configured to connect the assembly to the first capacitor using the first switch and connect the assembly to the second capacitor using the second switch, and wherein in the case where the second detection unit detects the oscillation frequency of the quartz oscillator, the controller is configured to disconnect the assembly from the first capacitor using the first switch and disconnect the assembly from the second capacitor using the second switch.