Patent ID: 8628715
Filing Date: 2014-01-14
Classification: B23K,H01S,H05K

Abstract:
1. A laser processing method comprising the steps of: placing an object, including a conductor layer and an insulating layer which is comprised of a resin and is laminated on the conductor layer, onto an optical path of pulsed laser light; and irradiating the object with the pulsed laser light so as to remove a part of the insulating layer located in a predetermined region on the conductor layer; wherein a wavelength exhibiting an absorptance of less than 10% with respect to the conductor layer and a reflectance of 70% or more with respect to the insulating layer is selected as a wavelength of the pulsed laser light, wherein a fluence per one pulse of the pulsed laser light is set in relation to a tolerable level of a carbon concentration detected on a surface of the conductor layer after removing the insulating layer, wherein a repetition frequency of the pulsed laser light is set such that the pulsed laser light has a full width at half maximum of shorter than 5 ns; and wherein the predetermined region of the object is irradiated with the pulsed laser light having the selected wavelength, the fluence per one pulse, and the repetition frequency such that the pulsed laser light reaches the conductor layer after passing through the insulating layer.