| 摘要 |
PURPOSE: To provide a device capable of precisely performing the toner concn. control with simple change without requiring the mechanical or the electrical change even in the case of the irregular change of analog signal detected by the toner concn. sensor due to the design change. CONSTITUTION: The device is constituted of the comparing means 52 for converting the analog signal showing the state of the toner amount detected from the toner concn. sensor 10, to the rectangular wave signal, by comparing with the reference signal of the constant voltage, the counter 53 for detecting the pulse width of the rectangular wave signal compared by the comparing means as the time information, and the operating means 55 for computing the operation value together with the summing unit for summing the specified correction count value (b) based on the subtraction amount, by subtracting the specified correction count value (a) from the time information detected by the pulse width detection means, and constituted that the toner replenishing control is performed based on the operation value. |
