Image pick-up lens system
US7212355B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 20, 2004 |
| Grant date | May 1, 2007 |
| Priority date | — |
| Expiry date | Dec 20, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image pick-up lens system includes an aperture stop (10), a biconvex first lens (20), and a meniscus-shaped second lens (30) having a concave surface on a side of an object. The aperture stop, the first lens and the second lens are aligned in that order from the object side to an image side. Each of the lenses has at least one aspheric surface, and both lenses are made from a same plastic or a resin. The system satisfies the following condition: (1) 1<T/f<1.7, wherein f is a focal length of the system, and T is a length from the aperture stop to an image pick-up surface of the image side. The first condition (1) limits the total length of the system in order to provide compactness. The system also satisfies other conditions (2)–(5) as disclosed, in order to provide compactness and cost-effectiveness and to correct fundamental aberrations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.