Image intensifier device with power supply disposed upstream of the photocathode

An image intensifier device comprising an intensifier tube and an electric power supply module, wherein the intensifier tube includes:

• at least one photocathode, configured to convert an incident photon beam into an initial electron beam;
• a micro-channel plate, configured, in use, to generate a plurality of secondary electrons in response to the reception of an incident electron, and configured to receive said initial electron beam and to generate in response an intensified electron beam;
• and
• a conversion element, configured to receive the intensified electron beam and to emit in response an intensified photon beam, with the micro-channel plate located between the photocathode and the conversion element;
• a first set of lenses, called objective, configured to optically conjugate a focusing surface located outside the intensifier tube, and an initial image forming surface located inside or at the input of the intensifier tube;
• the electric power supply module being configured to supply at least one respective biasing voltage, to each of the photocathode, the micro-channel plate, and the conversion;
• wherein the electric power supply module extends in a region located entirely upstream of the photocathode, on the side of the photocathode opposite to the micro-channel plate, at the periphery of the objective.