Patent ID: 6825615
Filing Date: 2004-11-30
Classification: H01K

Abstract:
A lamp for use as a heat source of a heat treatment apparatus for applying a heat treatment to an object to be processed, the lamp comprising:at least one electrode part to which an electric power is supplied; a transparent envelope connected to said electrode part, the transparent envelope sealing a filament for emitting a light; and a high-reflectance film formed on an outer surface of a first part of said transparent envelope so that said high-reflectance film reflects the light emitted from said filament and the reflected light exits from said transparent envelope through a second part of said transparent envelope other than said first part on which said high-reflectance film is formed so as to improve a directivity of the light exiting from said second part of said transparent envelope, wherein said electrode part is connected to one end of said transparent envelope having an elongated tubular shape so as to form a single end lamp, and said first part of said transparent envelope extends in a longitudinal direction of said transparent envelope, and wherein said transparent envelope has a straight cylindrical shape having a closed one end as a bottom surface, and said high-reflectance film is formed on an entire outer surface of said transparent envelope other than said bottom surface.