Patent ID: 6718127
Filing Date: 2004-04-06
Classification: C30B,H01L

Abstract:
Heating device of the light irradiation type with a light source part in which several filament lamps with circular or arc-shaped arc tubes are located in concentric rings, and which has mirror surfaces which reflect light emitted from the filament lamps in a direction toward a workpiece so that the workpiece is heated, wherein a reflector is provided in a center area of the light source part, the reflector projecting in the direction toward the workpiece and being configured to reflect the light from an innermost one of the filament lamps which is located closest to the center area of the light source part; wherein the innermost filament lamp is sized and positioned so as to satisfy the relationship d<2L, where L is a diameter of the innermost filament lamp measured between opposite center points of an the arc tube of the innermost filament lamp and d is a distance between the workpiece and a middle plane which runs through the arc tube of the filament lamp essentially parallel to the workpiece.