Image pick-up lens system
US7239458B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 20, 2005 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Oct 20, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/0055
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image pick-up lens system includes an aperture stop (10), a biconvex first lens (20), a second lens (30) having a concave surface on an object side, and a third lens (40) having a concave surface on an image side. The aperture stop (10), the first lens (20), the second lens (30) and the third lens (40) are aligned in that order from the object side to the image side. All lenses in the system are made from a plastic or resin material, and one of them has a diffraction grating formed on a surface. The system satisfies conditions (1)-(5) as disclosed, in order to provide compactness, cost-effectiveness and improved optical performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.