Browse Prior Art Database

Part Inspection using Wedge Illumination

IP.com Disclosure Number: IPCOM000040940D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Begnoche, N: AUTHOR [+2]

Abstract

As part of a visual inspection system, this invention automates the inspection of three-dimensional parts such as pins on ceramic substrates, solder balls on substrates, contamination particles on glass slides.

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Part Inspection using Wedge Illumination

As part of a visual inspection system, this invention automates the inspection of three-dimensional parts such as pins on ceramic substrates, solder balls on substrates, contamination particles on glass slides.

Suitable conventional single line fiber optic light sources are arranged around the object to be tested. A cylindrical glass rod is positioned in front of each light source to generate a sheet of collimated light directed in a grazing angle at the part to be tested. The "Z" axis of the parts are thus struck by the light beam from all directions and the reflected light representing an image of the part is displayed on a television monitor. Thus, the third dimension of each part is enhanced, and automatic inspection is performed to detect defective elements such as bent pins, missing balls, dust particles.

Disclosed anonymously

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