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1. (WO2001023188) IMAGE FORMING DEVICE AND IMAGE FORMING METHOD

Pub. No.:    WO/2001/023188    International Application No.:    PCT/JP2000/006813
Publication Date: Apr 5, 2001 International Filing Date: Sep 29, 2000
IPC: B41J 2/415
Applicants: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

ARRAY AB

TAKAMINE, Koichi

Inventors: TAKAMINE, Koichi

Title: IMAGE FORMING DEVICE AND IMAGE FORMING METHOD
Abstract:
An image forming device comprising pulse width modulating means for controlling the time during which a pulse signal is applied to toner passage control means (3) according to an image signal and voltage value changing means for controlling the voltage value of the pulse signal. The voltage value changing means keeps the voltage value of the pulse signal outputted from a pulse width modulating means to a predetermined value or more during the period of time from the rise of the pulse signal until the period of time equal to n times (n is an integer) the minimum pulse width PWmin of the pulse signal elapses, and then keeps the voltage value of the pulse signal to a value that is the sum of the minimum voltage value PWmin and m-(n+1) times (m is an integer and m- (n+1) is the number of gradations) the unit voltage PV when the pulse width of the pulse signal is larger than n time the minimum pulse width PWmin.