Browse Prior Art Database

Dark Field Illuminator

IP.com Disclosure Number: IPCOM000045610D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Charnetsky, RH: AUTHOR [+3]

Abstract

An inexpensive and effective dark field illuminator for the inspection of large surfaces can be made by using one or more slide projectors in parallel, each using slits as reticles.

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Dark Field Illuminator

An inexpensive and effective dark field illuminator for the inspection of large surfaces can be made by using one or more slide projectors in parallel, each using slits as reticles.

Referring to the figure, a pair of slide projectors 1 are arranged to direct light across the surface of a circuit panel 2 to a mirror 3 from which light is reflected. The light is directed through slides having horizontal transparent slits as reticles. A flexible opaque hood 4 is draped over the surface of the panel being inspected and over the operator. In addition, a microscope on an X-Y suspension is mounted under the hood to enable the sighting of small particulate. If desired, the inspection unit can be made portable.

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