Patent ID: 9298120
Filing Date: 2016-03-29
CPC Classification: G03G

Claim Text:
1. An image forming apparatus comprising: a photosensitive member; a charge portion for charging said photosensitive member, said charge portion being capable of mounting to or dismounting from said image forming apparatus; an applying portion for applying to said charge portion a charging bias voltage comprising a DC voltage and a superimposed AC voltage; a toner image forming portion for forming a toner image on said photosensitive member charged by said charge portion; a transfer portion for transferring the toner image formed on said photosensitive member onto a recording material; a fixing portion for fixing the transfer toner image on the recording material by heat and pressure; a first casing accommodating therein said photosensitive member, said charge portion, said applying portion, said toner image forming portion, said transfer portion and said fixing portion, said first casing being provided with an opening for permitting the recording material to enter; a second casing disposed at a lower position with respect to a vertical direction outside said first casing and accommodating therein a recording material accommodating portion which accommodates the recording material; a feeding portion for feeding the recording material into said first casing through said opening; a first temperature detecting portion, provided in said first casing, for detecting a temperature inside said first casing; a second temperature detecting portion, disposed in said second casing, for detecting a temperature inside said second casing; a mounting detecting portion for detecting a mounting operation of said charge portion to said image forming apparatus; and a setting portion for executing an operation in a first set mode for setting a peak-to-peak voltage of the AC voltage of the charging bias voltage on the basis of a detection result of said first temperature detecting portion, wherein when said mounting detecting portion detects the mounting operation, said setting portion executes an operation in a second set mode for setting the peak-to-peak voltage of the AC voltage on the basis of a detection result of a lower one of a temperature detected by said first temperature detecting portion and a temperature detected by said second temperature detecting portion.