Vacuum tube
AssigneesNoritake Itron Corporation, Noritake Co., Limited, Korg Inc.
InventorsKazunori Tatsuda, Tadami Maeda, Misa Yamanaka, Fumio Mieda
Life of this patent
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Abstract
A vacuum tube includes a filament and two pairs of a grid and an anode. The filament is tensioned linearly and emits thermoelectrons. Both of the anodes are formed on a same face on a planar substrate. The filament is arranged parallel to the planar substrate at a position facing both of the anodes. Each of the grids is arranged, such that the grid faces the anode of a same pair at a first predetermined distance from the anode and has a second predetermined distance from the filament, between the anode and the filament. The vacuum tube further includes an intermediate filament fixing part fixing the filament at a position corresponding to an intermediate point between the anodes of the two pairs.
Claims3
A vacuum tube comprising a filament and two pairs of a grid and an anode, wherein
- the filament is tensioned linearly and emits thermoelectrons;
- both of the anodes are formed on a same face of a planar substrate;
- the filament is arranged parallel to the planar substrate at a position facing both of the anodes;
- each of the grids is arranged, such that the grid faces the anode of a same pair at a first predetermined distance from the anode and has a second predetermined distance from the filament, between the anode and the filament;
- the vacuum tube further comprises an intermediate filament fixing part fixing the filament at a position corresponding to an intermediate point between the anodes of the two pairs;
- and
- the intermediate filament fixing part is at a position that divides the filament into two halves.
A vacuum tube comprising a filament and two pairs of a grid and an anode, wherein
- the filament is tensioned linearly and emits thermoelectrons;
- both of the anodes are formed on a same face of a planar substrate;
- the filament is arranged parallel to the planar substrate at a position facing both of the anodes;
- each of the grids is arranged, such that the grid faces the anode of a same pair at a first predetermined distance from the anode and has a second predetermined distance from the filament, between the anode and the filament;
- the vacuum tube further comprises an intermediate filament fixing part fixing the filament at a position corresponding to an intermediate point between the anodes of the two pairs;
- and
- a fundamental frequency of characteristic vibration of the filament is 3 kHz or higher.
A vacuum tube comprising a filament and two pairs of a grid and an anode, wherein
- the filament is tensioned linearly and emits thermoelectrons;
- both of the anodes are formed on a same face of a planar substrate;
- the filament is arranged parallel to the planar substrate at a position facing both of the anodes;
- each of the grids is arranged, such that the grid faces the anode of a same pair at a first predetermined distance from the anode and has a second predetermined distance from the filament, between the anode and the filament;
- the vacuum tube further comprises an intermediate filament fixing part fixing the filament at a position corresponding to an intermediate point between the anodes of the two pairs;
- and
- the filament faces only the two pairs.
Dependencies are inferred from the claim text.