Importance

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Abstract

A heating device includes a belt-shaped heated unit that rotates in a circulating manner, a heat generation unit that is provided in contact with a back surface side of the heated unit, and extends in an intersection direction intersecting with a rotation direction of the heated unit to heat the heated unit, a pressurization unit that brings the heated unit and the heat generation unit into contact with each other in a pressurized state to form a contact region being in contact with the heated unit and extending in a longitudinal direction of the heat generation unit, and a pressurization adjustment unit that adjusts the pressurized state by the pressurization unit so that a width in a lateral direction of the contact region changes, in which the heat generation unit includes plural heat generation resistors extending in the longitudinal direction, a high heat generation portion being narrow and having a high heat generation amount and a low heat generation portion being wide and having a low heat generation amount are formed in a row in the plural heat generation resistors, and for at least two heat generation resistors among the plural heat generation resistors, the high heat generation portions are formed in different regions in the longitudinal direction of the contact region, and in a case where a minimum contact region having a minimum width in the lateral direction of the contact region is formed by the pressurization unit, for the at least two heat generation resistors, an entire high heat generation portion is included in a range of the minimum contact region, a part of the low heat generation portion is included in the range of the minimum contact region, and a remaining part of the low heat generation portion is outside the range of the minimum contact region.

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First Claim