Heating device, fixing device, and image forming apparatus

A fixing device comprising:

• a heating device to heat a recording medium bearing an image;
• and
• a pressure rotator disposed opposite the heating device, the pressure rotator to fix the image on the recording medium together with the heating device,
• the heating device including:
• a heater that is laminated;
• and
• a heated member to be heated by the heater,
• the heater including:
• a base layer;
• and
• a resistive heat generator mounted on the base layer, the resistive heat generator extending in a longitudinal direction of the heater,
• the resistive heat generator including:
• a first heat generating portion having a first thickness, the first heat generating portion to generate heat in a first heat generation amount;
• and
• a second heat generating portion disposed in a lateral end span of the resistive heat generator in the longitudinal direction of the heater, the second heat generating portion having a second thickness that is greater than the first thickness of the first heat generating portion, the second heat generating portion to generate heat in a second heat generation amount that is smaller than the first heat generation amount of the first heat generating portion.

An image forming apparatus comprising:

• an image forming device to form an image;
• and
• a fixing device to fix the image on a recording medium,
• the fixing device including:
• a heating device to heat the recording medium bearing the image;
• and
• a pressure rotator disposed opposite the heating device,
• the heating device including:
• a heater that is laminated;
• and
• a heated member to be heated by the heater,
• the heater including:
• a base layer;
• and
• a resistive heat generator mounted on the base layer, the resistive heat generator extending in a longitudinal direction of the heater,
• the resistive heat generator including:
• a first heat generating portion having a first thickness, the first heat generating portion to generate heat in a first heat generation amount;
• and
• a second heat generating portion disposed in a lateral end span of the resistive heat generator in the longitudinal direction of the heater, the second heat generating portion having a second thickness that is greater than the first thickness of the first heat generating portion, the second heat generating portion to generate heat in a second heat generation amount that is smaller than the first heat generation amount of the first heat generating portion.