Image-capturing lens
US6493157B1 · kind B1 · utility
8Cited by
3References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 14, 2002 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Mar 14, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image-capturing lens is formed of front and rear lens groups having negative and positive refractive power, respectively, in order from the object side. The rear lens group is formed of, in relative sequential order from the most object side of the rear lens group, a biconvex lens element that is cemented to a biconcave lens element, a biconvex lens element, and a biconvex lens element. A specified condition is satisfied so as to make the cemented lens of the rear lens group insensitive to de-centering errors which may occur either in making the cemented lens or in assembling the image-capturing lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.