Patent ID: 7770916

Claim:
A laser beam processing method for processing an interior member for covering an air bag accommodated therein, with a laser beam emitted from a laser oscillator to form a linear fragile region, which is ruptured when the air bag accommodated therein is expanded, comprising: a first step of measuring a position of a first surface of said interior member, which serves as a facing side when said interior member is installed in a vehicle; a second step of adjusting a position of a focal point of said laser beam so as to come into alignment with a position at a predetermined depth from said first surface, based on a measured result from said first step; and a third step of applying said laser beam to a second surface of said interior member, which serves as a reverse side when said interior member is installed in the vehicle, thereby forming at least a portion of said fragile region; wherein said interior member and said laser oscillator are moved relatively by a programmable moving mechanism.