Eyeglasses for those who can see and read things clearly only at different focuses
US5914765A · kind A · utility
Inventor
Key dates
| Filing date | Dec 12, 1997 |
| Grant date | Jun 22, 1999 |
| Priority date | — |
| Expiry date | Dec 12, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/081
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A pair of eyeglasses includes a focus adjusting device including an auxiliary frame formed with two lens frames, two annular ring-like wheels rotatably fitted within the two lens frames, a flexible loop member connecting the two annular ring-like wheels, two lenses fitted in the two annular ring-like wheels, an engaging plate fixedly mounted on an intermediate portion of an inner side of the auxiliary frame and provided with a hook, and a main frame provided with a pair of temples for fitting over ears of a user and having two lens frames in which are fitted two lenses, the main frame having an inner side being provided with a recess dimensioned to receive the hook of the engaging plate, whereby the eyeglasses can be adjusted to change the focus as desired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.