Optical imaging system with movable solid-state imaging device for focus control
US6537208B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 7, 2000 |
| Grant date | Mar 25, 2003 |
| Priority date | — |
| Expiry date | Mar 15, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/54
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image pickup optical system for use in a magnifying endoscope or the like in which focus control is effected by moving a solid-state image pickup device. When a simultaneous solid-state image pickup device is used, color shading is suppressed satisfactorily, and flare-preventing measures are taken satisfactorily. Further, the center of the field and the center axis of the endoscope are allowed to coincide with each other at a reduced cost. The optical system is capable of being focused at a plurality of object distances by moving a solid-state image pickup device. The optical system is provided with a field lens by which light rays whose incident angle varies in accordance with focus control are made telecentric.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.