Optical lens having a hygroscopicity adjusting part
US5905599A · kind A · utility
31Cited by
1References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1998 |
| Grant date | May 18, 1999 |
| Priority date | — |
| Expiry date | Sep 29, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical lens made of plastic comprises an optically functioning part, a flange part disposed around the optically functioning part, and a gate-removed part located at an outer circumferential face of the flange part. The gate-removed part is defined by removing a residual gate part projecting from the outer circumferential face. The surface of the gate-removed part is covered with a hygroscopicity adjusting part. The hygroscopicity adjusting part is made of a material less hygroscopic than the plastic of which the optical lens is made.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.