LASER IRRADIATION DEVICE AND SURFACE ROUGHENING METHOD USING SAME

Zusammenfassung

It is intended to provide a laser irradiation device, whereby it is made possible to irradiate a laser beam optimal to perform roughening treatment for the surface of a member in order to enhance adhesiveness on the surface of the member, and simultaneously, a laser diode, even when used as a light source of the laser beam, can be mitigated in damage. The present laser irradiation device (10) irradiates a laser beam (L) at intervals of predetermined time. At one time of irradiation, the laser beam (L) has a waveform composed of a former portion (100) and a latter portion (104). In the former portion (100), an increase rate of irradiation intensity per unit time is maximized on an outset of irradiation and is gradually reduced as the irradiation intensity approaches a maximum. In the latter portion (104), a reduction rate of irradiation intensity per unit time is maximized after the former portion (100) and is gradually reduced as the irradiation intensity approaches a baseline current.