Patent ID: 7919727
Filing Date: 2011-04-05
Classification: B23K,H01L

Abstract:
1. A laser processing apparatus comprising: a substrate holding part that holds a substrate horizontally; a laser beam radiation part that radiates a laser beam to a target position on the substrate to thereby carry out predetermined processing on a surface of the substrate; a liquid supply source that supplies a liquid while applying a pressure to the liquid; a liquid supply nozzle that is connected to said liquid supply source through a liquid supply channel, includes a liquid ejection port having a bore in a range from 0.4 mm to 1.0 mm, and ejects the liquid supplied from said liquid supply source to said substrate held by said substrate holding part at a flow rate in a range from 20 m/s to 30 m/s in a direction of a depression angle in a range from 20° to 35°; a guide member that is provided above said substrate, guides the liquid ejected from said liquid supply nozzle such that the liquid passes between a bottom face thereof and the surface of said substrate, and is made of a transparent material through which the laser beam from said laser beam radiation part transmits; and a movement mechanism that moves said substrate holding part, and said laser beam radiation part, said guide member and said liquid supply nozzle relatively in a horizontal direction such that a radiation spot of the laser beam from the laser beam radiation part shifts in the surface of the substrate in a state that a center of the radiation spot is in a projection region on the surface of the substrate when the liquid ejection port of said liquid supply nozzle is extended in an ejection direction.