Device for day and night vision

Abstract

The invention concerns an optronic observation device comprising a detector, the detector comprising a photocathode and a sensor arranged to receive an incident light beam, the device also comprising switching means able to position an optical element opposite said detector on the pathway of the incident beam or to retract said element, the device comprising means able to focus an incident ray on the photocathode when the element is in retracted position, characterized in that the element, when positioned opposite the detector, 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.

Dependencies are inferred from the claim text.