Patent ID: 9044830
Filing Date: 2015-06-02
Classification: B23K,H05K,Y02P,Y10T

Abstract:
1. A method for forming a cavity in a core substrate, comprising: setting a start position on a closed loop line having a circumference L in μm for a core substrate; consecutively irradiating laser from a laser irradiating device upon a flat board for the core substrate such that a plurality of laser-processed holes each having a diameter φ in μm is formed in the flat board; and moving the laser irradiating device in a loop from the start position of the closed loop line along the closed loop line such that a penetrating hole penetrating through the flat board is formed in the flat board for the core substrate, wherein the start position of a first loop by the laser irradiating device is set as a base position on the closed loop line, the moving of the laser irradiating device includes shifting the start position by a distance d after each loop and controlling the laser irradiating device such that the moving of the laser irradiating device in the loop satisfies p=Σd