Imaging device with focus switching means for day and night vision
US7297924B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 13, 2006 |
| Grant date | Nov 20, 2007 |
| Priority date | — |
| Expiry date | Feb 20, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optronic observation device including a detector having a photocathode and a sensor arranged to receive an incident light beam. The device also including a switch to position an optical element opposite the detector in the pathway of the incident beam or to retract the optical element and a focusing element to focus an incident ray on the photocathode when the optical element is in a retracted position. When the optical element is positioned opposite the detector, it is able to focus the beam on the sensor and to filter the beam spectrally to block all or part of the wavelengths for which the responsiveness of the photocathode is greater than a given threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.