Browse Prior Art Database

OBLIQUE VIEW UNIVERSAL INSPECTION MODULE

IP.com Disclosure Number: IPCOM000006423D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2002-Jan-02
Document File: 2 page(s) / 89K

Publishing Venue

Motorola

Related People

Ted Golubic: AUTHOR

Abstract

State-of-the-art automatic wire bond inspection stations provide "hands-or damage-free, magazine- to-magazine transport of wire bonded leadframes. Additionally, these typical eyepiece/vision system work stations present to the inspector a vertical field-of-view of all bonded wires in a given unit with uniformly illu- minated diffuse lighting for fatigue-free eye comfort.

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MOTOROLA INC. Technical Developments Volume 15 May 1992

OBLIQUE VIEW UNIVERSAL INSPECTION MODULE

by Ted Golubic

  State-of-the-art automatic wire bond inspection stations provide "hands-or damage-free, magazine- to-magazine transport of wire bonded leadframes. Additionally, these typical eyepiece/vision system work stations present to the inspector a vertical field-of-view of all bonded wires in a given unit with uniformly illu- minated diffuse lighting for fatigue-free eye comfort.

  In contrast, manual inspection stations require direct finger contact with the leadframes causing intolerable levels of inspection-induced yield losses in handling dam- age to bonded wires. While automatic leadframe han- dling equipment eliminates this damage, their otherwise above-mentioned ties mask basic shortcomings. From an interim period of production manual inspection expe- rience a valuable benefit had been gained: hand-held inspection transfer trays enabled the inspector the rare opportunity to tilt the specimen (bonded leadframe) to gain a better view-an oblique view-of all of the bonded wires. This oblique view offers a capability for foolproof verification of lied wires (Figure 1, View B). The verti- cal view of bonded wires can not reliably detect lifted wires (Figure 1, View A). Failure analysis of customer- returned field failures have been documented to have a high percentage of lifted wires, no small part of which went undetected at wire bond inspection gate.

  Upon eva...