Patent ID: 8319143
Filing Date: 2012-11-27
Classification: B23K,H01L

Abstract:
1. A laser processing apparatus having holding means for holding a workpiece to be processed and processing means for applying a laser beam to said workpiece held by said holding means, said processing means comprising: an oscillator for oscillating said laser beam; a focusing lens for focusing said laser beam oscillated by said oscillator toward said workpiece; a movable portion for supporting said focusing lens and moving said focusing lens in a direction perpendicular to said workpiece; a fixed portion having a gas bearing portion for supporting said movable portion by using a gas, said fixed portion and said movable portion constituting a voice coil motor; and a supporting member for supporting said movable portion from the under side by using a magnetic repulsive action, wherein the magnetic repulsive action is created in the direction perpendicular to said workplace by two pairs of permanent magnets, with the permanent magnets of each pair being arranged to oppose each other.