Patent ID: 6822665
Filing Date: 2004-11-23
Classification: B41J

Abstract:
A thermal bead comprising:a metal substrate; an insulating layer formed on the surface of said metal substrate; a plurality of heating elements disposed on the surface of said insulating layer, said heating elements being arranged with a predetermined pitch along a plurality of lines in a main scanning direction, said plurality of lines being spaced from each other in a paper feeding direction perpendicular to the main scanning direction; and a heat radiating element projecting from the surface of said metal substrate to the side where said insulating layer is disposed, wherein current does not flow through said heat radiating element to said heating elements, and wherein said heat radiating element is disposed at least in a part of a region between said metal substrate and a gap between one line of said heating elements and an adjacent line of said heating elements, and wherein a part, in contact with one line of said heating elements, of said insulating layer and a part, in contact with a directly adjacent line of said heating elements, of said insulating layer are connected to each other in a region in contact with said gap so that heat can be conducted therebetween.