Image forming device, control method for image forming device, and control program for image forming device

A control method for an image forming device comprising:

• a charging unit configured to apply charging bias voltage to a charging member and charge a surface of an image carrying body;
• an exposure unit configured to expose the surface of the image carrying body charged by the charging unit to attenuate potential, and form an electrostatic latent image on the image carrying body;
• and
• a developing unit of a two-component development system configured to apply, to a developer carrying body, developing bias voltage having homopolarity with polarity of the charging bias voltage, and develop the electrostatic latent image,
• the control method comprising:
• a determining step of determining a value of the charging bias voltage to be applied during image forming;
• and
• a controlling step of controlling timing to start applying the developing bias voltage relative to timing to start applying the charging bias voltage in accordance with the value of the charging bias voltage determined in the determining step,
• wherein, in the controlling step, control is performed such that the larger an absolute value of the charging bias voltage is, the shorter an interval from timing to start applying the charging bias voltage to timing to start applying the developing bias voltage becomes, and control is performed such that the smaller the absolute value of the charging bias voltage is, the longer the interval becomes.

A non-transitory recording medium storing a computer readable control program for an image forming device comprising:

• a charging unit configured to apply charging bias voltage to a charging member and charge a surface of an image carrying body;
• an exposure unit configured to expose the surface of the image carrying body charged by the charging unit to attenuate potential, and form an electrostatic latent image on the image carrying body;
• and
• a developing unit of a two-component development system configured to apply, to a developer carrying body, developing bias voltage having homopolarity with polarity of the charging bias voltage, and develop the electrostatic latent image,
• the control program causing a computer to execute:
• a determining step of determining a value of the charging bias voltage applied during image forming;
• and
• a controlling step of controlling timing to start applying the developing bias voltage relative to timing to start applying the charging bias voltage in accordance with the value of the charging bias voltage determined in the determining step,
• wherein, in the controlling step, control is performed such that the larger an absolute value of the charging bias voltage is, the shorter an interval from timing to start applying the charging bias voltage to timing to start applying the developing bias voltage becomes, and control is performed such that the smaller the absolute value of the charging bias voltage is, the longer the interval becomes.