Lamp unit and light radiating type heating device

摘要

A plurality of filament lamps having filaments arranged within an annular light emitting tube are arranged coaxially within a plane to provide a group of lamps, and a plurality of groups of lamps are arranged in a step-like manner with their centers coinciding with each other to form a lamp unit LU. A lamp chamber having this lamp unit arranged therein is provided with a cooling air inlet port and a cooling air outlet port. An inner surface of a side wall of the lamp chamber is provided with a mirror. A workpiece holding block arranged in a light radiation chamber below the lamp chamber can be rotated. <IMAGE>