Zoom lens system consisting of two lens units
US6333824A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 9, 1999 |
| Grant date | Dec 25, 2001 |
| Priority date | — |
| Expiry date | Sep 9, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/142
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens system for compact cameras comprising, in order from the object side, a first negative lens unit and a second positive lens unit, and configured to be zoomed from a wide position to a teleposition by moving the lens units toward the object side while narrowing the airspace reserved between the two lens units; the first lens unit comprising a first negative subunit and a second positive subunit, the first subunit comprising a biconcave lens component having a radius of curvature on the image side smaller than that on the object side, and a negative meniscus lens component having a convex surface on the object side, the second lens unit comprising, in order from the object side, a positive lens component and a negative lens component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.