Plastic lens and method of making a plastic lens
US6055111A · kind A · utility
83Cited by
2References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1998 |
| Grant date | Apr 25, 2000 |
| Priority date | — |
| Expiry date | Jun 5, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A plastic lens which is easy to mold and has favorable optical precision. This plastic lens has a flange at the outer periphery of an optically functioning portion, a part of the peripheral surface of the flange being provided with a gate-positioning projection, and a side face of the gate-positioned projection including a cut-off portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.