Compact zoom lens system
US5257135A · kind A · utility
29Cited by
7References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1991 |
| Grant date | Oct 26, 1993 |
| Priority date | — |
| Expiry date | Sep 30, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/143105
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A compact zoom lens system comprises from the object side: a first lens component of a positive refractive power; a second lens component of a negative refractive power with a variable air space between the first and second lens components; and a third lens component of a positive refractive power with a variable air space between the second and third lens components. A plurality of aspherical surfaces are employed for the realization of a compact and low-cost zoom lens system. Furthermore, a focusing operation is carried out by both of the first and second lens components or third lens component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.