Device for viewing beneath circuit boards

Details Device for viewing beneath circuit boards Device for viewing beneath circuit boards

1990-07-24

1991-10-01

McGraw, Vincent P.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

356241, 359798, 359802, 359726, 359882, G01N 2188, G02B 2324

Patent

active

050528025

ABSTRACT:
A hand-held, portable, visual inspection aid is described which has a variety of uses in diverse fields, e.g., manufacturing, service and repair industries, health care field, hobby field, etc. The inspection aid includes a light source and a prism having one mirrored surface. Optionally there may also be included a magnifying lens for magnifying the image viewed through the prism. The device is useful for visually inspecting objects in areas not readily viewed with the naked eye.

REFERENCES:
patent: 1292326 (1919-01-01), Jacobson
patent: 2725788 (1955-12-01), Pfleger
patent: 3481660 (1969-12-01), Sheldon
patent: 4938579 (1990-07-01), Kempf
Johnson et al "Optical System for Viewing Dielectric Smear in Printed Circuit Board Hole and Deleting the Smear" IBM Tech. Disc. Bulletin, vol. 25 #9, Feb. 1983, pp. 4513-4514.

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