Imaging lens and imaging apparatus
US7911715B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 27, 2009 |
| Grant date | Mar 22, 2011 |
| Priority date | — |
| Expiry date | Jan 27, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging lens includes in order from an object side: a first lens including a positive lens having a convex surface directed to the object side; a stop; a second lens including a positive lens having a convex surface directed to an image side; a third lens including a negative meniscus lens with a concave surface directed to the object side; and a fourth lens including, near an optical axis, a positive meniscus shape with a convex surface directed to the object side. An air space between the second lens and the third lens is smaller in a periphery than near the optical axis. And f1>f2>|f3| and 1.0<f/f2<1.5 are satisfied where f1, f2 and f3 are focal lengths of the first lens, the second lens, and the third lens, respectively and f is an focal length of the whole lens system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.