Lens and process for the production thereof
US8357624B2 · kind B2 · utility
1Cited by
6References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2007 |
| Grant date | Jan 22, 2013 |
| Priority date | — |
| Expiry date | Mar 23, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2215/72
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A lens formed of a high-refractivity low-dispersion glass and free of fogging and scorching on its optical-function surface, which is obtained by precision press-molding of an optical glass having a refractive index (nd) of over 1.83, an Abbe's number (νd) of 40 or more and a glass transition temperature (Tg) of 640° C. or lower and containing no Li2O and has one form of a meniscus form, a biconcave form or a plano-concave form.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.