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发明授权
CN107966889B 定影装置、图像形成装置 有权

定影装置、图像形成装置
摘要：
本发明采用对应于各个检测位置的特性的检测构件，其目的是提供一种能够防止定影构件的宽度方向中央侧的过度升温的定影装置(7)，其包括能够旋转的定影辊(22)、与定影辊抵接并旋转的加压辊(23)、主要对定影辊的宽度方向中央侧加热的中央加热管(30a)、主要对定影辊的宽度方向端部侧加热的端部加热管(30b)、检测定影辊的宽度方向中央侧的温度的中央侧检测构件(31)和检测定影辊的宽度方向端部侧的温度的端部侧检测构件(32)，其特征在于，中央侧检测构件与定影辊以非接触方式来检测定影辊的温度，端部侧检测构件与定影辊接触地来检测定影辊的温度，并且，中央侧检测构件的热时间常数要小于端部侧检测构件的热时间常数。
摘要（英）：

A fixing device includes a fixing rotator including a primary portion and a secondary portion disposed outboard from the primary portion in an axial direction of the fixing rotator. A pressure rotator contacts the fixing rotator to form a fixing nip between the fixing rotator and the pressure rotator, through which a recording medium is conveyed. A primary heater heats the primary portion of the fixing rotator. A secondary heater heats the secondary portion of the fixing rotator. A primary temperature detector is isolated from the fixing rotator and detects a temperature of the primary portion of the fixing rotator. A secondary temperature detector contacts the fixing rotator and detects a temperature of the secondary portion of the fixing rotator. The primary temperature detector has a thermal time constant that is smaller than a thermal time constant of the secondary temperature detector.

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