Patent ID: 7262390

Claim:
A thermal processing, comprising: disposing a heated object on a supporter, wherein the heated object is an object to be heated and has an object center; disposing a set of heating lamps formed by a plurality of heating lamps over the heated object, wherein the heating lamps are arranged in a plurality of subsets of the heating lamps respectively forming a plurality of radially-spaced concentric rings, wherein the set of the heating lamps has a lamp center, wherein the object center and the lamp center are shifted one from the other by an offset e such that the object center is at a position with local mean heat flux from lamps between a most inner lamp subset and its adjacent lamp subset; applying heating powers to the heating lamps for heating the heated object, wherein an individual one of the same subset of the heating lamps is applied with the same heating power; and performing a relative rotation between the heated object and the set of the heating lamps, wherein the relative rotation is eccentric and caused from the offset between the object center and the lamp center such that local areas of the heated object pass through the position under the ring of lamps with local maximum irradiance, and then pass through a position between two adjacent rings of lamps with local minimum irradiance.