Patent ID: 11940747
Assignee: CANON KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A heater comprising:
an elongated substrate;
a heating element arranged on a first surface of the substrate;
a first temperature detection element arranged on a second surface opposite of the first surface of the substrate;
a second temperature detection element arranged on the second surface;
a first conductor arranged on the second surface and connecting the first temperature detection element to a first power supply terminal;
a second conductor arranged on the second surface and connecting the first temperature detection element and a first grounding terminal;
a third conductor arranged on the second surface and connecting the second temperature detection element and a second power supply terminal; and
a fourth conductor arranged on the second surface and connecting the second temperature detection element and a second grounding terminal,
wherein, in a longitudinal direction of the heater, a distance from a center portion of the heater to the first temperature detection element is a first distance, and a distance from the center portion of the heater to the second temperature detection element is a second distance that is greater than the first distance, and
wherein, in a first area which is farther from the center portion of the heater than the second temperature detection element is from the center portion of the heater in the longitudinal direction of the heater, a distance between the first conductor and the second conductor in a transverse direction of the heater is a first inter-conductor distance and a distance between the third conductor and the fourth conductor in the transverse direction is a second inter-conductor distance that is greater than the first inter-conductor distance.