HEATER FOR MELTING GLASS

WIPO Patent Application WO/2021/125040

A1

This heater for melting glass includes a heat generating member that contains carbon (C) and that radiates a heat ray when supplied with power, and a metal cylindrical member which accommodates the heat generating member and one end of which is closed, wherein: the heat generating member includes, in the extension axis direction of the heater, a first heat generating portion and a second heat generating portion; the first heat generating portion is disposed in a position closer to said one end of the cylindrical member than the second heat generating portion; and if X (Ω/m) is the resistance per unit length in the extension axis direction of the first heat generating portion, and Y (Ω/m) is the resistance per unit length in the extension axis direction of the second heat generating portion, the following formula holds: (1) ... (1/30)X