US Patent No. 9,596,718

HEATER AND IMAGE HEATING APPARATUS INCLUDING THE SAME


Patent No. 9,596,718
Issue Date March 14, 2017
Title Heater And Image Heating Apparatus Including The Same
Inventorship Toshinori Nakayama, Kashiwa (JP)
Assignee CANON KABUSHIKI KAISHA, Tokyo (JP)

Claim of US Patent No. 9,596,718

1. A heater usable with an image heating apparatus including an electric energy supplying portion provided with a first terminal
and a second terminal, and an endless belt for heating an image on a sheet, wherein said heater is contactable to the belt
to heat the belt, said heater comprising:
a substrate;
a plurality of contact portions including at least a first contact portion provided on said substrate and electrically connectable
with the first terminal, and a plurality of second contact portions provided on said substrate and electrically connectable
with the second terminal;

a plurality of electrode portions arranged in a longitudinal direction of said substrate with predetermined gaps therebetween;
a plurality of electroconductive line portions electrically connecting said electrode portions with respective ones of said
contact portions, such that an electrode portion electrically connected with said at least one first contact portion and another
electrode portion electrically connected with said second contact portions are alternately arranged in the longitudinal direction
of said substrate; and

a plurality of heat generating portions, provided between adjacent electrode portions, respectively, for generating heat by
electric power supply between adjacent electrode portions,

wherein all of said first contact portions are provided in one end portion side of said substrate with respect to the longitudinal
direction, and all of said second contact portions are provided in another end portion side of said substrate with respect
to the longitudinal direction,

wherein said electroconductive line portions include:
a first electroconductive line portion electrically connecting a first heat generating portion of said heat generating portions
with said at least one contact portion,

a second electroconductive line portion electrically connecting a second heat generating portion of said heat generating portions,
which is different from said first heat generating portion, with one of said second contact portions,

a third electroconductive line portion electrically connecting said first heat generating portion with a predetermined contact
portion of said second contact portions, and

a fourth electroconductive line portion electrically connecting said second heat generating portion with the predetermined
contact portion,

wherein said first electroconductive line portion is longer than said second electroconductive line portion, and said fourth
electroconductive line portion is longer than said third electroconductive line portion.