Imaging lens
US7345830B2 · kind B2 · utility
23Cited by
3References
31Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 13, 2006 |
| Grant date | Mar 18, 2008 |
| Priority date | — |
| Expiry date | Apr 13, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging lens is provided and includes, in order from an object side of the imaging lens: a first lens of a positive lens; a second lens of a negative lens; a third lens of a bi-aspheric lens that has an image-side surface having an extreme point at a position other than an optical axis of the imaging lens; and a fourth lens of a bi-aspheric lens that has an object-side surface having an extreme point at a position other than the optical axis. The imaging lens satisfies Conditional Expressions specified in the specification.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.