Imaging lens
US6795253B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 2003 |
| Grant date | Sep 21, 2004 |
| Priority date | — |
| Expiry date | Apr 25, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging lens includes, in order from the object side, a positive meniscus first lens component with its convex lens surface on the object side, a positive meniscus second lens component with its convex lens surface on the image side, and a negative third lens component with its concave lens surface on the image side. At least both lens surfaces of the negative third component are aspheric, and all six lens surfaces of the three lens components may be aspheric. The negative refractive power of the third lens component gradually decreases from the center of the third lens component toward the periphery of said third lens component and the peripheral region of the third lens component, outside 70% of its radius, has positive refractive power. The imaging lens may consist of only three lens components or elements. A diaphragm is positioned between the first and second lens components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.