Patent ID: 8178819
Filing Date: 2012-05-15
Classification: B23K,C23C,G02B,H01L

Abstract:
1. An automatic focusing mechanism for a thermal processing device, comprising: a continuous wave electromagnetic radiation module configured to focus continuous wave electromagnetic radiation into a line of continuous wave electromagnetic radiation on a surface of a substrate; a stage configured to receive a substrate thereon; at least two photo detectors at least partially supported on said stage at different locations of said stage to allow between them measurements for adjustment of a height and at least one of pitch and roll of the stage, where said at least two photo detectors are configured to measure intensities of said continuous wave electromagnetic radiation; a translation mechanism configured to translate said stage and said continuous wave electromagnetic radiation module relative to one another including horizontally moving said line over a surface of said substrate; an adjustment mechanism coupled to said stage, where said adjustment mechanism is configured to adjust the height and the at least one of a roll and a pitch of said stage; and a controller coupled to said continuous wave electromagnetic radiation module, said at least two photo detectors, said translation mechanism, and said adjustment mechanism, wherein the at least two photo detectors transmit the measured intensities to the controller and the controller in response instructs the adjustment mechanism to adjust the height and the least one of the roll and the pitch.