Patent ID: 9665017
Date: 2017-05-30
CPC Classifications: G03F,H05G

Claim:
1. A method for EUV lithography light source operation, comprising: generating a pulsed EUV light by exciting an EUV light excitation source material, wherein a plurality of droplets are generated from the EUV light excitation source material and move away from the EUV light excitation source material toward a plurality of reflective mirrors; configuring a mirror control system to move the plurality of reflective mirrors to be simultaneously in a reflective state during a pulsed EUV light cycle; and configuring the mirror control system to move the plurality of reflective mirrors to be simultaneously in a non-reflective state with a predetermined delay time by rotating the plurality of reflective mirrors to be substantially parallel to a corresponding flight direction of the plurality of droplets for preventing contamination of the plurality of reflective mirrors by the plurality of droplets.