Optical instrument for observing surface engravings on optical lenses
US6034826A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 24, 1998 |
| Grant date | Mar 7, 2000 |
| Priority date | — |
| Expiry date | Feb 24, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B25/02
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.