US3368096A - Deflection plates coated with secondary electron emissionsuppressing metal - Google Patents

Deflection plates coated with secondary electron emissionsuppressing metal Download PDF

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Publication number
US3368096A
US3368096A US632109A US63210967A US3368096A US 3368096 A US3368096 A US 3368096A US 632109 A US632109 A US 632109A US 63210967 A US63210967 A US 63210967A US 3368096 A US3368096 A US 3368096A
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US
United States
Prior art keywords
deflection plates
electron beam
thin
inner surfaces
path
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
US632109A
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English (en)
Inventor
Yoshida Osamu
Ashizaki Shigeya
Kaname Masaharu
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 US3368096A publication Critical patent/US3368096A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/74—Deflecting by electric fields only
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/82—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements

Definitions

  • This invention relates to improvements relating to methods of manufacturing cathode-ray tubes with electrostatic deflection and cathode-ray tubes manufactured by such methods.
  • the difliculties referred to are substantially attributable to impurities present on the inner surfaces of the deflection plates, that is on those surfaces of the deflection plates which are adjacent to each other. It is supposed that the impurities, which may consist of metal oxides and other impurities which may get on the surfaces of the deflection plates during assembling the electrode system, may cause undesirable stray of the electrons, for example, due to reflection of primary electrons and secondary emission.
  • the above-mentioned difliculties are avoided by the method in accordance with the invention which is characterized by arranging at least one thin metal plate laterally in front of each set of the deflection plates, the metal of the metal plate, after exhaustion of the tube, being evaporation-deposited on the inner surfaces of the deflection plates for forming thereon a glossy conductive layer. Since the impurities are now covered by a pure, glossy conductive layer, they can no longer exert any influence on the electrons.
  • FIGURE 1 shows part of a cathode-ray tube
  • FIGURE 2 shows the set of deflection plates.
  • FIGURE 1 the electron gun is indicated by 1.
  • Thin nickel plates 2 and 4 are arranged respectively laterally in front of deflection plates 3 for vertical deflection and laterally in front of deflection plates 5 for horizontal deflection.
  • plates with finely rugged surface may be preferably used to avoid the detrimental effect caused by ballistic reflection of electron beam.
  • the glass envelope of the tube is noted by reference numeral 6.
  • Nickel and niEkel-chrome alloys have been found to be suitable metals for the plates 2 and 4 since they hardly emit any secondary electrons.
  • the plates 2 and 4 are heated, preferably by high frequency induction currents, so that the metal of the plates is evaporated and deposited as a glossy pure metal on the inner surfaces of the deflection plates 3 and 5, respectively, the layer wholly covering any impurities present on the surfaces. It will be evident that the precipitation of metal vapor at undesired areas may be prevented by providing shields and by correct positioning and shaping of the plates 2 and 4 respectively.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US632109A 1963-08-31 1967-04-19 Deflection plates coated with secondary electron emissionsuppressing metal Expired - Lifetime US3368096A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6614963 1963-08-31

Publications (1)

Publication Number Publication Date
US3368096A true US3368096A (en) 1968-02-06

Family

ID=13307505

Family Applications (1)

Application Number Title Priority Date Filing Date
US632109A Expired - Lifetime US3368096A (en) 1963-08-31 1967-04-19 Deflection plates coated with secondary electron emissionsuppressing metal

Country Status (6)

Country Link
US (1) US3368096A (enrdf_load_stackoverflow)
BE (1) BE652503A (enrdf_load_stackoverflow)
DE (1) DE1238110B (enrdf_load_stackoverflow)
FR (1) FR1405172A (enrdf_load_stackoverflow)
GB (1) GB1073240A (enrdf_load_stackoverflow)
NL (1) NL6409938A (enrdf_load_stackoverflow)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2244260A (en) * 1938-06-21 1941-06-03 Rca Corp Electron discharge tube
US2336895A (en) * 1940-07-23 1943-12-14 Cossor Ltd A C Cathode ray tube

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT150547B (de) * 1934-07-07 1937-09-10 Fernseh Ag Kathodenstrahlröhre.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2244260A (en) * 1938-06-21 1941-06-03 Rca Corp Electron discharge tube
US2336895A (en) * 1940-07-23 1943-12-14 Cossor Ltd A C Cathode ray tube

Also Published As

Publication number Publication date
BE652503A (enrdf_load_stackoverflow) 1964-12-16
FR1405172A (fr) 1965-07-02
NL6409938A (enrdf_load_stackoverflow) 1965-03-01
DE1238110B (de) 1967-04-06
GB1073240A (en) 1967-06-21

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