Browse Prior Art Database

Improved Laser Microweld Technique

IP.com Disclosure Number: IPCOM000040917D
Original Publication Date: 1987-Mar-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Fan, B: AUTHOR [+3]

Abstract

This article describes a laser microweld technique which utilizes lenses to couple laser light from fiber into the bonder tip to prevent damaging the fiber and tip.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Improved Laser Microweld Technique

This article describes a laser microweld technique which utilizes lenses to couple laser light from fiber into the bonder tip to prevent damaging the fiber and tip.

It has been shown that engineering change (EC) wire bonds can be made on multilayer ceramic substrates with a neodymium: yttrium aluminum garnet (Nd:Yag) laser. An optical fiber transmits laser light into a hollow conical tungsten carbide tip, which holds down the wire onto the EC pad. When laser energy is applied, the gold-plated copper wire melts and forms a bond with the pad under pressure. However, this simple fiber-in-tip set up has frequently burned the fiber and plugged the tip. In the technique disclosed herein light is coupled from the fiber into tip by means of lenses, which are far away from the tip end and, therefore, less likely to cause damage. Further, light can be focused tightly onto the tip end, resulting in efficient use of the laser energy.

Disclosed anonymously

1