GB1525396A – Sintered cathode
– Google Patents
GB1525396A – Sintered cathode
– Google Patents
Sintered cathode
Info
Publication number
GB1525396A
GB1525396A
GB42448/75A
GB4244875A
GB1525396A
GB 1525396 A
GB1525396 A
GB 1525396A
GB 42448/75 A
GB42448/75 A
GB 42448/75A
GB 4244875 A
GB4244875 A
GB 4244875A
GB 1525396 A
GB1525396 A
GB 1525396A
Authority
GB
United Kingdom
Prior art keywords
areas
grid
oct
projections
focusing effect
Prior art date
1974-10-19
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB42448/75A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1974-10-19
Filing date
1975-10-16
Publication date
1978-09-20
1975-10-16
Application filed by Philips Electronic and Associated Industries Ltd
filed
Critical
Philips Electronic and Associated Industries Ltd
1978-09-20
Publication of GB1525396A
publication
Critical
patent/GB1525396A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H01—ELECTRIC ELEMENTS
H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
H01J1/02—Main electrodes
H01J1/13—Solid thermionic cathodes
H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
H01J1/28—Dispenser-type cathodes, e.g. L-cathode
H—ELECTRICITY
H01—ELECTRIC ELEMENTS
H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
H01J9/02—Manufacture of electrodes or electrode systems
H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
Abstract
1525396 Cathode constructions PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 16 Oct 1975 [19 Oct 1974] 42448/75 Heading H1D To reduce grid current in a grid controlled electron tube, a sintered impregnated or dispenser cathode 1 includes areas 2 of reduced emissivity which project from the emitting surface; the areas coincide with the grid and have a focusing effect. The areas are formed by fusion using an electron, ion or laser beam. The focusing effect may be increased by removing material from the emitting areas 3a by spark erosion or photoetching; the projections are subsequently repassivated. The projections may be formed before sintering. Triodes, tetrodes, klystrons and travelling wave tubes are referred to.
GB42448/75A
1974-10-19
1975-10-16
Sintered cathode
Expired
GB1525396A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
DE2449796A
DE2449796C3
(en)
1974-10-19
1974-10-19
Supply cathode for a grid-controlled electron tube and process for their manufacture
Publications (1)
Publication Number
Publication Date
GB1525396A
true
GB1525396A
(en)
1978-09-20
Family
ID=5928705
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB42448/75A
Expired
GB1525396A
(en)
1974-10-19
1975-10-16
Sintered cathode
Country Status (7)
Country
Link
US
(1)
US4031425A
(en)
JP
(1)
JPS563614B2
(en)
CA
(1)
CA1046132A
(en)
DE
(1)
DE2449796C3
(en)
FR
(1)
FR2288384A1
(en)
GB
(1)
GB1525396A
(en)
NL
(1)
NL7511842A
(en)
Families Citing this family (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB1507544A
(en)
*
1975-12-29
1978-04-19
English Electric Valve Co Ltd
Linear beam tubes
US4361781A
(en)
*
1980-05-12
1982-11-30
International Business Machines Corporation
Multiple electron beam cathode ray tube
NL8105921A
(en)
*
1981-12-31
1983-07-18
Philips Nv
TELEVISION ROOM TUBE.
CH678671A5
(en)
*
1989-08-22
1991-10-15
Asea Brown Boveri
KR950006088B1
(en)
*
1992-06-27
1995-06-08
주식회사엘지전자
Sinking pallet of sinking form cathode structure and method of manufacturing the same
WO2002091421A1
(en)
*
2001-05-01
2002-11-14
Nikon Corporation
Electron beam apparatus and device manufacturing method using the electron beam apparatus
Family Cites Families (9)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2782334A
(en)
*
1952-03-10
1957-02-19
Raytheon Mfg Co
Velocity modulated electron discharge devices
US3119041A
(en)
*
1961-12-26
1964-01-21
Gen Electric
Bipotential cathode
NL6504397A
(en)
*
1965-04-07
1966-10-10
US3377492A
(en)
*
1965-08-03
1968-04-09
Hughes Aircraft Co
Flood gun for storage tubes having a dome-shaped cathode and dome-shaped grid electrodes
US3500110A
(en)
*
1967-08-23
1970-03-10
Raytheon Co
Noncurrent intercepting electron beam control element
US3648096A
(en)
*
1968-09-26
1972-03-07
Gen Electric
Electron beam focusing bipotential cathode
US3558967A
(en)
*
1969-06-16
1971-01-26
Varian Associates
Linear beam tube with plural cathode beamlets providing a convergent electron stream
US3843902A
(en)
*
1972-08-24
1974-10-22
Varian Associates
Gridded convergent flow electron gun
US3818260A
(en)
*
1973-03-05
1974-06-18
Sperry Rand Corp
Electron gun with masked cathode and non-intercepting control grid
1974
1974-10-19
DE
DE2449796A
patent/DE2449796C3/en
not_active
Expired
1975
1975-10-02
US
US05/619,061
patent/US4031425A/en
not_active
Expired – Lifetime
1975-10-09
NL
NL7511842A
patent/NL7511842A/en
unknown
1975-10-16
JP
JP12388675A
patent/JPS563614B2/ja
not_active
Expired
1975-10-16
CA
CA237,768A
patent/CA1046132A/en
not_active
Expired
1975-10-16
GB
GB42448/75A
patent/GB1525396A/en
not_active
Expired
1975-10-17
FR
FR7531872A
patent/FR2288384A1/en
active
Granted
Also Published As
Publication number
Publication date
US4031425A
(en)
1977-06-21
DE2449796C3
(en)
1980-03-06
DE2449796B2
(en)
1979-05-23
JPS5165558A
(en)
1976-06-07
CA1046132A
(en)
1979-01-09
NL7511842A
(en)
1976-04-21
DE2449796A1
(en)
1976-04-22
JPS563614B2
(en)
1981-01-26
FR2288384B1
(en)
1980-07-18
FR2288384A1
(en)
1976-05-14
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(en)
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Legal Events
Date
Code
Title
Description
1979-01-10
PS
Patent sealed [section 19, patents act 1949]
1991-06-12
PCNP
Patent ceased through non-payment of renewal fee
