Patent ID: 9616469
Date: 2017-04-11
CPC Classifications: B08B,G03F,H01L

Claim:
1. A light irradiation device comprising: a workpiece support configured to support a workpiece thereon; an ultraviolet lamp configured to irradiate a target surface of the workpiece with a vacuum ultraviolet beam; a light transmitting window member disposed between the workpiece and the ultraviolet lamp, and configured to transmit the vacuum ultraviolet beam, which is emitted from the ultraviolet lamp, therethrough, with a gap defined between the target surface of the workpiece and the light transmitting window member being equal to or smaller than 1 mm; a gas feeding unit configured to feed a processing gas into the gap in one direction along the target surface; and a gas shielding member disposed on the workpiece support in a region in which the workpiece is not present, the gas shielding member extending in a feeding direction of the processing gas and being arranged such that a side face of the gas shielding member in a longitudinal direction contacts a side face of the workpiece supported by the workpiece support with respect to the feeding direction of the processing gas, and a height of the gas shielding member being equal to a distance between the workpiece support and the light transmitting window member.