发明名称 |
Fixing device and image forming apparatus incorporating same |
摘要 |
A fixing device includes a fixing member, a pressing member, a heating unit, multiple sub-heaters disposed in the heating unit, a temperature sensor to detect a temperature of the heating unit, and a heating control unit. The heating control unit controls the heating unit by controlling the multiple sub-heaters individually to heat the respective heating areas, such that a temperature at a portion of the fixing member corresponding to a blank area of the recording medium is lower than a temperature of a portion of the fixing member corresponding to an imaged area of the recording medium. The heating control unit further changes a size of a preliminary heating area to preliminarily heat the respective heating areas before the imaged area enters the fixing nip according to the temperature detected by the temperature sensor. |
申请公布号 |
US9152105(B2) |
申请公布日期 |
2015.10.06 |
申请号 |
US201414168357 |
申请日期 |
2014.01.30 |
申请人 |
Ricoh Company, Ltd. |
发明人 |
Kishi Kazuhito |
分类号 |
G03G15/20 |
主分类号 |
G03G15/20 |
代理机构 |
Oblon, McClelland, Maier & Neustadt, L.L.P. |
代理人 |
Oblon, McClelland, Maier & Neustadt, L.L.P. |
主权项 |
1. A fixing device to fix an unfixed image on a recording material in a fixing nip, the fixing device comprising:
a rotatable fixing member to contact the unfixed image; a pressing member to contact the fixing member and form the fixing nip between the pressing member and the fixing member; a heater to heat the fixing member with electric power from a power source; multiple sub-heaters disposed in the heater to heat respective heating areas, arrayed in a direction perpendicular to a direction in which a recording material is conveyed; a temperature sensor to detect a temperature of the heater; and a heating controller to control the heater by controlling the multiple sub-heaters individually to heat the respective heating areas, such that a temperature at a portion of the fixing member corresponding to a blank area of the recording medium is lower than a temperature of a portion of the fixing member corresponding to an imaged area of the recording medium, the heating controller further changing a size of a preliminary heating area by changing a duration of a preliminary heating to preliminarily heat the respective heating areas before the imaged area enters the fixing nip according to the temperature detected by the temperature sensor. |
地址 |
Tokyo JP |