Patent ID: 6570134
Filing Date: 2003-05-27
Classification: H01L

Abstract:
Heat treatment device of the light irradiation type which comprises:a light source part having a plurality concentrically arranged circular filament lamps of different ring diameters and a mirror located behind said filament lamps; a wafer located on a side of said lamps that is opposite said mirror; and a guard ring which is located in a peripheral area of the wafer; wherein said filament lamps of the light source part are composed of a first lamp group located opposite the wafer and of a second lamp group located opposite the guard ring at an outer periphery of the first lamp group; wherein a distance between the lamps in the second lamp group and the guard ring in a direction of light irradiation is larger than a distance between the lamps of the first lamp group and the wafer in the direction of light irradiation; and wherein a side wall is provided between the second lamp group and the first lamp group.