| 发明名称 | Fixing device and image formation apparatus | ||
| 摘要 | A fixing device for fixing an unfixed toner image on a recording sheet by passing the recording sheet through a fixing nip and applying heat and pressure to the recording sheet, the fixing device comprising: a heater including a resistance heater part and a supporting member, the resistance heater part having a positive resistance-temperature characteristic in a temperature range above a predetermined level, and the supporting member being insulative and supporting the resistance heater part such that the resistance heater part applies heat to the recording sheet; a current detector detecting a current supplied to the resistance heater part; and an abnormality determiner determining whether the resistance heater part has an abnormality, based on an initial current detected by the current detector at a predetermined time after a beginning of power supply to the resistance heater part and before the temperature of the resistance heater part reaches the predetermined level. | ||
| 申请公布号 | US9002220(B2) | 申请公布日期 | 2015.04.07 |
| 申请号 | US201113236692 | 申请日期 | 2011.09.20 |
| 申请人 | Konica Minolta Business Technologies, Inc. | 发明人 | Ishihara Yasuhiro;Yoshikawa Hiroyuki;Sasaki Kosuke;Watanabe Isao |
| 分类号 | G03G15/20;G03G15/00 | 主分类号 | G03G15/20 |
| 代理机构 | Buchanan Ingersoll & Rooney PC | 代理人 | Buchanan Ingersoll & Rooney PC |
| 主权项 | 1. A fixing device for fixing an unfixed toner image formed on a recording sheet by passing the recording sheet through a fixing nip and applying heat and pressure to the recording sheet, the fixing device comprising: a heater including a resistance heater part and a supporting member, the resistance heater part having a positive resistance-temperature characteristic in a temperature range above a predetermined level and exhibiting a nonlinear change in resistance when a temperature thereof exceeds the predetermined level, and the supporting member being insulative and supporting the resistance heater part such that the resistance heater part applies heat to the recording sheet passing through the fixing nip; a current detector detecting a current supplied to the resistance heater part; and an abnormality determiner determining whether the resistance heater part has an abnormality, based on an initial current detected by the current detector at a predetermined time after a beginning of power supply to the resistance heater part and before the temperature of the resistance heater part reaches the predetermined level; wherein the abnormality determiner determines whether the resistance heater part has an abnormality only when the temperature of the resistance heater part is equal to room temperature. | ||
| 地址 | Chiyoda-Ku, Tokyo JP | ||