Imaging device with focus switching means for day and night vision
AssigneeSagem Defense Securite
InventorsGeoffroy DelTel, Sylvain Faure, Denis Guettier, Philippe Patry
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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.
Claims13
An Optronic observation device comprising a detector,
- the detector comprising a photocathode and a sensor arranged to receive an incident beam,
- the device also comprising switching means able to position an optical element opposite said detector in the pathway of the incident beam or to retract said optical element,
- the device comprising means able to focus an incident beam on the photocathode when the optical element is in retracted position, wherein the optical element, when positioned opposite the detector, is able to focus the incident beam on the sensor and to filter the incident beam spectrally to block all or part of the wavelengths for which the responsiveness of the photocathode is greater than a given threshold.
Dependencies are inferred from the claim text.