Illuminated magnifying glass
US5021933A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 9, 1990 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | May 9, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B25/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A magnifying glass device has a lens body comprised of a cylindrical portion and a convexly curved lens section both of which are rotationally symmetrical with respect to the cylindrical axis of the cylindrical portion. In the area between the circumferential surface of the cylindrical portion and the path of an edge light beam of the lens section passing through the cylindrical portion, at least one lamp is provided. An air gap is formed in the central area between facing surfaces of the cylindrical portion and the lens section. The light emitted by the lamp is substantially totally reflected by the facing surface of the cylindrical portion. Therefore, the lamp will not be seen by the user, but will provide good illumination for the surface viewed through the magnifying glass device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.