Image pickup lens system
US6560043B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2000 |
| Grant date | May 6, 2003 |
| Priority date | — |
| Expiry date | Sep 8, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/006
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image pickup lens system comprises a first lens which has a concave face formed on the side of an object in the vicinity of an optical axis, and which has a positive power, a diaphragm, a second lens having a negative power, and a third lens having a positive power. The first lens, the diaphragm and the second and third lenses are disposed sequentially from the side of the objects. If the image pickup lens system is formed in the above manner, a desired optical performance can be maintained, and a sufficient back focal length can be ensured, while a high telecentric property can be ensured. Moreover, various aberrations can be corrected satisfactorily, and the image pickup lens system can be produced easily.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.