| 主权项 |
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 first electrical contact provided on said substrate and electrically connectable with the first terminal; a plurality of second electrical contacts provided on said substrate and electrically connectable with the second terminal; an electroconductive line portion electrically connected with said first electrical contact, said electroconductive line portion being extending in a longitudinal direction of said substrate; a plurality of electrode portions including first electrode portions electrically connected with said first electrical contact through the electroconductive line portion and second electrode portions electrically connected with said second electrical contacts, said first electrode portions and said second electrode portions being arranged alternately with predetermined gaps in a longitudinal direction of said substrate; and a plurality of heat generating portions provided between adjacent ones of said electrode portions so as to electrically connect between adjacent electrode portions, said heat generating portions being capable of generating heat by electric power supply between adjacent electrode portions; wherein a cross-section of said electroconductive line portion in a side closer to said first electrical contact than said plurality of heat generating portions are with respect to the longitudinal direction is larger than a cross-section of a predetermined electrode portion, between adjacent heat generating portions, of said plurality of electrode portions. |
