Patent ID: 9700921
Date: 2017-07-11
CPC Classifications: B08B,G02F

Claim:
1. A method of cleaning a substrate by ultraviolet rays with adjustable radiation energy, comprising the following steps: step 1, providing an ultraviolet ray light that emits ultraviolet rays and a substrate to be cleaned with the ultraviolet rays; step 2, locating shading plates between the ultraviolet ray light and the substrate to be cleaned with the ultraviolet rays emitting from the ultraviolet ray light irradiating through a spacing gap between the shading plates toward an area of the substrate that corresponds to the spacing gap between the shading plates; step 3, rotating the shading plates about rotation axes respectively that extend in a predetermined direction between a first angular position where the spacing gap between the shading plates is of a minimum value and a second angular position where the spacing gap between the shading plates is of a maximum value to adjust a size of the area of the substrate irradiated with the ultraviolet rays emitting from the ultraviolet ray light so as to control radiation energy carrying by the ultraviolet rays impinging on the substrate in a predetermined period of time; and step 4, cleaning the substrate with the radiation energy carried by the ultraviolet rays emitting from the ultraviolet ray light and irradiated through the spacing gap between the shading plates, wherein the substrate is movable relative to ultraviolet ray light between a first location and a second location spaced from the first location; wherein the minimum value of the spacing gap between the shading plates at the first angular position is a predetermined value with which the shading plates are kept separate from each other to allow the substrate to be kept irradiated with the ultraviolet rays.