Optical instrument for observing surface engravings on optical l

Details Optical instrument for observing surface engravings on optical l Optical instrument for observing surface engravings on optical l

1998-02-24

2000-03-07

Epps, Georgia

Optical: systems and elements

Lens

With viewed object or viewed field illumination

359801, 359800, 359368, G02B 2702, G02B 2100

Patent

active

060348267

ABSTRACT:
An optical instrument for facilitating the observation of surface engravings located on an optical lens includes a base housing having a light source therein for illuminating the optical lens. An image contrastor, selected based on the type of lens to be examined, is placed on the base housing over the light source. The image contrastor includes its own housing within which is positioned a viewing plate and a light diffuser. A screening pattern or coating is formed on the viewing plate to define a backdrop for examining the lens. A support member extends from the base housing and carries a magnifying lens. With this arrangement, an optical lens may be placed between the image contrastor and the magnifying lens to enhance the observation of engravings on the optical lens.

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"Spectacle Lens Technology", D.F. Horne, M.B.E., 1978, p. 118.
Brochure, "Progressive Addition Lens Identification Device", Optivision 1996.

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