Optical imaging system having an electronically variable focal length and optical image sensor provided with such a system
US4927241A · kind A · utility
125Cited by
6References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 25, 1989 |
| Grant date | May 22, 1990 |
| Priority date | — |
| Expiry date | Sep 25, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/294
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging system having an electronically variable focal length is obtained by arranging, one after the other, a lens system (10) different sectors of which have different focal lengths and a liquid crystal diaphragm (20). By selecting sectors of the lens system with the aid of the diaphragm, an object (30) can be sharply imaged also at different object lengths in an image plane (40).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.