Invention Grant
- Patent Title: Cathode having a cavity in the emissive element
- Patent Title (中): 在电磁元件中具有空气的阴极
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Application No.: US3755705DApplication Date: 1972-01-31
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Publication No.: US3755705APublication Date: 1973-08-28
- Inventor: ZWANENBURG G
- Applicant: PHILIPS CORP
- Assignee: Philips Corp
- Current Assignee: Philips Corp
- Priority: NL7101954 1971-02-13
- Main IPC: H01J1/16
- IPC: H01J1/16 ; H01J37/065 ; H01J1/15 ; H01J19/08
Abstract:
A cavity is provided in a wire of a directly-heated cathode so that the temperature at the area of the cavity will be higher when a current is passed through the wire than on either side of the cavity. As a result, the cavity acts as a limited emissive surface and the cathode obtains a longer service life and a more stable construction.
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