Camera zoom lens
US5541772A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 7, 1993 |
| Grant date | Jul 30, 1996 |
| Priority date | — |
| Expiry date | Dec 7, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/142
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A camera zoom lens consists of five lens elements arranged in two groups, in which the first three elements form a front lens group with a positive refractive power and the last two elements form a rear lens group with a negative refracting power. In the lens system, the front lens group is composed of a negative first lens element having its concave surface directed toward the object side of the lens system, a negative second lens element, and a positive third lens element; the rear lens group consists of a positive fourth lens element having its concave surface directed toward the object side of the lens system and a negative fifth lens element having its concave surface directed toward the object side of the lens system. The zoom lens system is suitable for use in a 35 mm lens shutter camera.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.