公开(公告)号：FR2494035A1

公开(公告)日：1982-05-14

申请号：FR8023884

申请日：1980-11-07

Applicant: THOMSON CSF

Inventor： PALLUEL PIERRE ,  SHROFF ARVIND

IPC: H01J23/06 ,  H01J1/28 ,  H01J23/04

Abstract: This invention concerns a thermoelectronic cathode for hyperfrequency electron tubes. The cathode comprises a cylindrical molybdenum casing, the lower portion of which contains a heating filament, while the upper portion contains two superimposed porous bodies, the lower one made from impregnated material, and the upper one from non-impregnated material.

公开(公告)号：DE3173470D1

公开(公告)日：1986-02-20

申请号：DE3173470

申请日：1981-10-27

Applicant: THOMSON CSF

Inventor： PALLUEL PIERRE ,  SHROFF ARVIND

IPC: H01J23/06 ,  H01J1/28 ,  H01J23/04

Abstract: This invention concerns a thermoelectronic cathode for hyperfrequency electron tubes. The cathode comprises a cylindrical molybdenum casing, the lower portion of which contains a heating filament, while the upper portion contains two superimposed porous bodies, the lower one made from impregnated material, and the upper one from non-impregnated material.

公开(公告)号：FR2469792A1

公开(公告)日：1981-05-22

申请号：FR7927715

申请日：1979-11-09

Applicant: THOMSON CSF

Inventor： SHROFF ARVIND ,  PALLUEL PIERRE

IPC: H01J1/14 ,  H01J1/28 ,  H01J9/04 ,  H01J23/04 ,  H01J23/06 ,  H01J1/13

Abstract: The hot cathode, according to the invention, is constituted by a fritted matrix 1 and a heating filament 4, said matrix being formed from a powder mixture 2 of tungsten and another high work function refractory metal and covered with a high work function refractory metal film 3. FIG. 3.

公开(公告)号：DE2429025A1

公开(公告)日：1975-01-23

申请号：DE2429025

申请日：1974-06-18

Applicant: THOMSON CSF

Inventor： PALLUEL PIERRE ,  HERVIER JEAN-PIERRE ,  ROUSSEAU JEAN

IPC: H01J23/027

Abstract: In order to reduce the drawbacks, encountered in microwave electronic tubes, resulting from the presence of electrons reflected from the collector of these tubes towards the tube input, the invention provides for the collectors of these tubes to take the form of hollow bodies whose at least part of the internal volume exhibits an axis of symmetry not coinciding with the axis of the beam. This arrangement reduces the number of electrons liable to return towards the tube input and produces a spread in their phases. Application is made to klystrons.