Patent ID: 11947295
Assignee: RICOH COMPANY, LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A heating device comprising:
a heater including a base and a plurality of resistive heat generators arranged on the base in an arrangement direction, separated from each other, and forming a heat generation area, the heater having separation areas that each include an entire gap between neighboring ones of the plurality of resistive heat generators in the arrangement direction;
a rotator;
a pressure rotator configured to press the rotator, the pressure rotator including:
a first region facing a first range of the heater, the first range being 20 mm from a center position of the heat generation area toward an end of the heat generation area in the arrangement direction, the first region having an outer diameter increasing in a direction from the center position of the heat generation area toward the end of the heat generation area, the first region based on a central separation area of the heater; and
a second region facing at least a part of a second range of the heater, the second range different from the first range, the second range being 30 mm from a center position of the separation area toward the center position of the heat generation area, the second region having an outer diameter increasing at an increasing rate larger than an increasing rate of the outer diameter of the first region in the direction from the center position of the heat generation area toward the end of the heat generation area, the second region based on a peripheral separation area of the heater;

wherein the pressure rotator has an inflection point facing a position of the heater that is 10 mm or more from the center position of the separation area toward the center position of the heat generation area in the arrangement direction,
wherein the first region extends from the inflection point toward a position being on the pressure rotator and facing the center position of the heat generation area, and
wherein the second region extends in an opposite direction of the first region from the inflection point toward a position being on the pressure rotator and facing the end of the heat generation area.