| 摘要 |
PROBLEM TO BE SOLVED: To provide a developing device that improves image density and dot reproducibility, and to provide an image forming apparatus that has the developing device. SOLUTION: A developing device 1 applies an alternating voltage superimposed on a direct current voltage to a developing roller 3 to thereby develop an electrostatic latent image formed on a photoreceptor 51 with toner. A bias voltage waveform superimposed at this time has an original period (first period) in which each of a development-side electrical potential and an opposite development-side electrical potential is applied one time and a period (second period) in which a Vpp is gradually increased from the initial value to the maximum value. COPYRIGHT: (C)2009,JPO&INPIT
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