US3341917A - Method of manufacturing cathodes for electron tubes - Google Patents

Method of manufacturing cathodes for electron tubes Download PDF

Info

Publication number
US3341917A
US3341917A US361799A US36179964A US3341917A US 3341917 A US3341917 A US 3341917A US 361799 A US361799 A US 361799A US 36179964 A US36179964 A US 36179964A US 3341917 A US3341917 A US 3341917A
Authority
US
United States
Prior art keywords
mandrel
cathode
manufacturing
electron tubes
insulating material
Prior art date
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 - Lifetime
Application number
US361799A
Other languages
English (en)
Inventor
Oyabu Shunzo
Masuda Junzo
Matsumoto Hiroyuki
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electronics Corp
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.)
Filing date
Publication date
Application filed by Matsushita Electronics Corp filed Critical Matsushita Electronics Corp
Application granted granted Critical
Publication of US3341917A publication Critical patent/US3341917A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49071—Electromagnet, transformer or inductor by winding or coiling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49982—Coating
    • Y10T29/49986—Subsequent to metal working

Definitions

  • the present invention relates to a method of manufacturing a cathode for electron tubes, and more particularly to an improved method of making a small-sized flat cathode which operates highly effectively when incorporated in electron tubes such as miniwatt cathode ray tubes.
  • the primary object of the invention is to provide an improved and simplified method of manufacturing a miniature cathode especially suitable for incorporation in miniwatt electron tubes such as miniwatt cathode ray tubes.
  • FIG. 1 is a schematic side elevational view showing the step of shaping a composite article in a manufacturing method of the invention
  • FIG. 2 is a sectional side elevational view of the composite article deformed by the step shown in FIG. 1;
  • FIG. 3 is a perspective view of a finished cathode heater element obtained from vthe composite article of FIG. 2; 7 FIG. 4 is a perspective view of a directly heated cathode incorporating therein the cathode heater element as shown in FIG. 3', with a part broken away to show the cathode heater element disposed therein;
  • FIG. 5 is a schematic side elevational view showing the step of forming a composite structure for the purpose of obtaining a cathode heater element with an insulating covering thereon by the method according to the invention
  • FIG. 6 is a perspective view of the composite structure made by the step of FIG. 5;
  • FIG. 8 is a perspective view of another form of the directly heated cathode which is formed from the insulated cathode heater element obtained by the step shown in FIG. 5;
  • FIG. 9 is a modification of the forming step shown in FIG. 5.
  • the composite article 1 having been deformed as shown in FIG. 2 is soaked in a solution such as of a mixture of nitric acid and sulfuric acid for removing the mandrel 2 alone by the selective dissolution. Subsequent- 1y, unnecessary portions at opposite end edges of the flat heating filament 7 are cut off and the ends are bent to form conductive terminals 8 thereat to obtain a cathode heater element in the form of a flat coil as shown in FIG. 3.
  • the cathode heater element as shown in FIG. 3, obtained by the manufacturing method according to the invention is subsequently subjected to processes, as will be explained hereinunder, to provide a directly heated cathode.
  • FIG. 5 it will be seen that a frame member or a mold 11 of high-temperature resisting material preferably of molybdenum is placed on a fiat plate 12, and a deformed composite article 14 as shown in FIG. 2 is disposed within an aperture 13 of the mold :11.
  • an insulating material 16 in the form of paste is filled by use of a pallet 17.
  • the insulating material 16 may comprise aluminum oxide kneaded with distilled water or a solution of nitrocellulose.
  • This filling operation should be made on opposite sides of the composite article 14 by at first applying the paste 16 as shown in 'FIG. 5 and then inverting the mold 11 upside down on the fiat plate 12 to apply the paste on the opposite side of the composite article .14, except a special case as will be described later.
  • an insulating layer 19 is provide on one face of the fiat heating filament 18, while an electron emissive oxide layer 20 is provided on the other face of the filament 18.
  • the directly heated cathode with such structure is sturdy and has an excellent thermal efficiency. Therefore, it is quite effective for use in miniwatt cathode ray tubes.
  • the insulating layer 19 can be provided by applying the pallet 17 solely to one face of the composite article 14 in the process shown in FIG. 5, instead of filling the insulating material 16 from both sides of the article 14.
  • the composite article 31 is firmly bonded to the insulating material 30 to form a unitary structure, and a composite structure as shown in FIG. 6 can be taken out of the recess 29 in the die 28.
  • the external dimensions of the cathode heater element 21 covered with insulating material can easily be regulated in the process shown in FIG. 5 or 9. Therefore, by suitably selecting the shape of the aperture 13 of the mold 11 or the recess 29 of the die 28, the cathode heater element covered with insulating material which has a flat and smooth surface and any desired external shape can be obtained regardless of the shape of the heating filament.
  • a method of manufacturing a cathode element for electron tubes comprising the steps of coiling a heating filament about a unitary mandrel of soluble metal, applying pressure to deform said assembled heating filament and mandrel together into close fitting unitary relation, providing a coating layer of material on at least one surface of said assembled and flattened filament and mandrel and selectively removing said flattened mandrel by selec tive dissolution.
  • a method of manufacturing a cathode element for electron tubes according to claim 3 in which a layer of electron emissive oxide is directly formed on each face of said layer of insulating material after said step of removal of said flattened mandrel.
  • a method of manufacturing a cathode element for electron tubes comprising the steps of coiling a heating filament about a mandrel of soluble metal, applying pressure to flatten said heating filament and said mandrel in unitary relation, providing a coating layer of insulating material on one surface of said assembled and flattened filament and mandrel, sintering said insulating material at a suitable temperature, selectively removing said flattened mandrel by selective dissolution, and providing a layer of electron emissive oxide on the other surface of said heating filament after the selective removal of said flattened mandrel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)
US361799A 1963-04-30 1964-04-22 Method of manufacturing cathodes for electron tubes Expired - Lifetime US3341917A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2296863 1963-04-30

Publications (1)

Publication Number Publication Date
US3341917A true US3341917A (en) 1967-09-19

Family

ID=12097363

Family Applications (1)

Application Number Title Priority Date Filing Date
US361799A Expired - Lifetime US3341917A (en) 1963-04-30 1964-04-22 Method of manufacturing cathodes for electron tubes

Country Status (9)

Country Link
US (1) US3341917A (de)
AT (1) AT265448B (de)
BE (1) BE647298A (de)
CH (1) CH422169A (de)
DE (1) DE1258520B (de)
DK (1) DK114991B (de)
GB (1) GB1057909A (de)
NL (1) NL139622B (de)
SE (1) SE321033B (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512250A (en) * 1966-05-13 1970-05-19 Horst H Lemet Chromium Van Der Method for mutually connecting workpieces and workpieces mutually connected by said method
US3574910A (en) * 1967-01-25 1971-04-13 Philips Corp Method of manufacturing an indirectly heated disclike cathode and cathode manufactured by said method
JPS4886463A (de) * 1972-02-17 1973-11-15
US3992201A (en) * 1972-02-04 1976-11-16 Duro-Test Corporation Filaments for fluorescent lamps
US4296399A (en) * 1977-12-21 1981-10-20 A-T-O Inc. Microminiature palladium oxide gas detector and method of making same
US4523125A (en) * 1981-07-13 1985-06-11 General Electric Company Fluorescent lamp electrodes
US4599881A (en) * 1983-04-28 1986-07-15 Roda Holding Anstalt Method and arrangement for winding and forming helixes of elastic plastic or metal wire
US4813126A (en) * 1986-10-01 1989-03-21 Williamson Windings Inc. Apparatus and method for fabricating magnetic devices
US5343112A (en) * 1989-01-18 1994-08-30 Balzers Aktiengesellschaft Cathode arrangement
US20100171411A1 (en) * 2007-06-13 2010-07-08 Aerojet-General Corporation Cathode heater

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010038904B4 (de) * 2010-08-04 2012-09-20 Siemens Aktiengesellschaft Kathode

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1767716A (en) * 1927-06-27 1930-06-24 Central Radio Lab Electrical resistance and method of making same
US2287460A (en) * 1940-11-29 1942-06-23 Rca Corp Insulated heater and method of manufacture
US2394474A (en) * 1944-12-28 1946-02-05 Gen Electric Coiled filament or cathode and its manufacture
US2482826A (en) * 1945-08-04 1949-09-27 Tung Sol Lamp Works Inc Filament structure for thermionic tubes
US2548592A (en) * 1949-08-26 1951-04-10 Gen Electric Resistance strain gauge and method for making same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE475720A (de) * 1946-08-30
NL105737C (de) 1958-06-10
DE1143589B (de) * 1959-12-22 1963-02-14 Edgerton Germeshausen And Grie Verfahren zur Herstellung eines Heizers fuer Kathoden von elektrischen Entladungsroehren
NL284356A (de) 1962-10-15

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1767716A (en) * 1927-06-27 1930-06-24 Central Radio Lab Electrical resistance and method of making same
US2287460A (en) * 1940-11-29 1942-06-23 Rca Corp Insulated heater and method of manufacture
US2394474A (en) * 1944-12-28 1946-02-05 Gen Electric Coiled filament or cathode and its manufacture
US2482826A (en) * 1945-08-04 1949-09-27 Tung Sol Lamp Works Inc Filament structure for thermionic tubes
US2548592A (en) * 1949-08-26 1951-04-10 Gen Electric Resistance strain gauge and method for making same

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512250A (en) * 1966-05-13 1970-05-19 Horst H Lemet Chromium Van Der Method for mutually connecting workpieces and workpieces mutually connected by said method
US3574910A (en) * 1967-01-25 1971-04-13 Philips Corp Method of manufacturing an indirectly heated disclike cathode and cathode manufactured by said method
US3992201A (en) * 1972-02-04 1976-11-16 Duro-Test Corporation Filaments for fluorescent lamps
JPS4886463A (de) * 1972-02-17 1973-11-15
US4296399A (en) * 1977-12-21 1981-10-20 A-T-O Inc. Microminiature palladium oxide gas detector and method of making same
US4523125A (en) * 1981-07-13 1985-06-11 General Electric Company Fluorescent lamp electrodes
US4599881A (en) * 1983-04-28 1986-07-15 Roda Holding Anstalt Method and arrangement for winding and forming helixes of elastic plastic or metal wire
US4813126A (en) * 1986-10-01 1989-03-21 Williamson Windings Inc. Apparatus and method for fabricating magnetic devices
US5343112A (en) * 1989-01-18 1994-08-30 Balzers Aktiengesellschaft Cathode arrangement
US20100171411A1 (en) * 2007-06-13 2010-07-08 Aerojet-General Corporation Cathode heater

Also Published As

Publication number Publication date
DE1258520B (de) 1968-01-11
GB1057909A (en) 1967-02-08
SE321033B (de) 1970-02-23
BE647298A (de) 1964-08-17
NL6404760A (de) 1964-11-02
DK114991B (da) 1969-08-25
CH422169A (de) 1966-10-15
NL139622B (nl) 1973-08-15
AT265448B (de) 1968-10-10

Similar Documents

Publication Publication Date Title
US3341917A (en) Method of manufacturing cathodes for electron tubes
US6849292B1 (en) Manufacture of solid state capacitors
US2705292A (en) Slot conductor for dynamoelectric machines
US4554407A (en) Superconducting conductors having a stabilizing sheath brazed to its matrix and a process for making the same
US3327184A (en) Wound capacitor and method of making
US3803441A (en) Indirectly heated type cathode devices using foil heater embedded in mixture of heat resistant dielectric and a metal
US2845691A (en) Manufacture of grids for electron discharge devices
JP3557564B2 (ja) 積層型固体電解コンデンサ
JP6414557B2 (ja) 表面実装インダクタ及びその製造方法
CN103632847B (zh) 一种轴向模压钽电容器及其制造方法
US3294125A (en) Electrode coil and method
US3667002A (en) Strip configuration for capacitors
US3530342A (en) Method for making solid electrolytic capacitors utilizing a strip configuration
US4002884A (en) Heater element for an indirectly heated cathode
JP2802086B2 (ja) 電解コンデンサの製造方法
US3300842A (en) Method of making delay line structures
US3421207A (en) Method of manufacturing solid bodies containing nb3sn
JPS5963955A (ja) 電機子コイルの製造方法
JP6885887B2 (ja) 固体電解コンデンサ及びその製造方法
JP3540722B2 (ja) 固体電解コンデンサにおけるコンデンサ素子の構造
JPS59287A (ja) マトリクスカソ−ド製造法
JPH0561771B2 (de)
JPS6149812B2 (de)
JP2001332449A (ja) 固体電解コンデンサ用の陽極体及びその製造方法
JPS6054772B2 (ja) チツプ型固体電解コンデンサの製造方法