Browse Prior Art Database

WIREBOND INSPECTION USING PLANE OF LIGHT

IP.com Disclosure Number: IPCOM000009648D
Original Publication Date: 2000-Jan-01
Included in the Prior Art Database: 2002-Sep-06
Document File: 1 page(s) / 67K

Publishing Venue

Motorola

Related People

Luis Allegri: AUTHOR [+3]

Abstract

Wirebonding inspection is a process step between wirebonding and molding. We present an invention whereby three-dimensional spatial exten- sion of the wirebond link is obtained. This data is then analyzed and compared against wirebonding diagrams and their corresponding wirebonding loop definitions.

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Technical m M-LA Developments

WIREBOND INSPECTION USING PLANE OF LIGHT

by Luis Allegri, Chris LeBeau and David Lehnen

ABSTRACT

  Wirebonding inspection is a process step between wirebonding and molding. We present an invention whereby three-dimensional spatial exten- sion of the wirebond link is obtained. This data is then analyzed and compared against wirebonding diagrams and their corresponding wirebonding loop definitions.

PROBLEM STATEMENT

  In the electronic packaging manufacturing process, wirebonding is a technique used to join the electrical contact pads of a die to the leads of a package. The wirebonds are wire links between the die and the leads and are used to transfer the electri- cal signal between the die and the outside world. Wirebonds are normally encapsulated in mold mate- rial (resin). Due to the fluidic forces applied to the wirebonds during molding, the quality of the wire- bonds need to meet strict spatial placement to pre- vent defects. Its joining process determines the quality of a wirebond whereas the spatial placement of the wirebonds is determined visually.

  The spatial location of a wirebond and its exten- sion in space must be visually inspected prior to molding. There is a need for fast, reliable, low-cost, and three-dimensional measurement of each wire- bond in an electronic package to prevent wirebond- ing defects. Typical defects due to poor wirebond location and extension in space are wirebond shorts, wirebond breakage, and wires tha...