Patent ID: 6397465
Filing Date: 2002-06-04
Classification: B23K,B41J,H01L,H01R,H05K,Y10T

Abstract:
A method of solderless bonding of electrical leads of a TAB circuit to electrical contact bumps by a laser beam having a specified wavelength, said leads and said contact bumps being of a like metal; and said method comprising the steps of:providing the electrical leads, of a particular metal; providing the electrical contact bumps, of said particular metal; providing the electrical leads with a metallic coating on a surface of the electrical leads that is at a particular side of said leads, said metallic coating being coated directly onto a permanent element of the TAB circuit and having a suitable absorption at the wavelength of the laser beam; aligning the electrical leads with the electrical contact bumps, said electrical contact bumps being at an opposite side of said electrical leads from said surface; and bonding the electrical leads and electrical contact bumps by directing the laser beam to said leads and metallic coating, from said particular side of said leads, to form a bond between said particular metal of said leads and bumps in common.