Patent ID: 6337537
Filing Date: 2002-01-08
Classification: H01J

Abstract:
A vacuum diode, for the detection of electromagnetic radiation (2), this diode comprising:a photo-cathode (4) intended to receive the radiation, and a grid (6) positioned facing the photo-cathode and spaced apart from it, intended to collect the electrons emitted by the photo-cathode when the photo-cathode receives the radiation, this diode being characterized in that the grid (6) has the shape of a cylinder and surrounds the photo-cathode (4), the latter extending along the axis (X) of the cylinder, in that the photo-cathode comprises a part (4) of the internal conductor (10) of a coaxial cable (8), the external conductor and the electrically insulating material (14) of this coaxial cable being removed opposite this part, and in that the grid (6) is electrically connected to the external conductor (12) of this coaxial cable, the internal and external conductors being coaxial.