JPS57151143A - Production method of crt - Google Patents

Production method of crt

Info

Publication number
JPS57151143A
JPS57151143A JP3532981A JP3532981A JPS57151143A JP S57151143 A JPS57151143 A JP S57151143A JP 3532981 A JP3532981 A JP 3532981A JP 3532981 A JP3532981 A JP 3532981A JP S57151143 A JPS57151143 A JP S57151143A
Authority
JP
Japan
Prior art keywords
current
oxide cathode
time
activation
unitl
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.)
Pending
Application number
JP3532981A
Other languages
Japanese (ja)
Inventor
Osamu Kato
Yoshinori Oyamada
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.)
Hitachi Ltd
Original Assignee
Hitachi 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.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP3532981A priority Critical patent/JPS57151143A/en
Publication of JPS57151143A publication Critical patent/JPS57151143A/en
Pending legal-status Critical Current

Links

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
    • H01J9/042—Manufacture, activation of the emissive part
    • H01J9/045—Activation of assembled cathode

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

PURPOSE:To prevent free barium from decreasing by continuously feeding a current not less than a rated surrent to a heater of an oxide cathode after activation of the oxide cathode unitl a hermetic sealing process. CONSTITUTION:At time t0, a heater of an oxide cathode is turned on to start an activation process, and the current is increased in steps, being kept at, e.g., 0.3A for one minute, 0.79A for one minute, and 0.87A for three minutes. During this time, the oxide cathode is heated up to about 900-950 deg.C. Then, the heater current is lowered to 0.81A and is kept there for two minutes, and the activation process is finished at time t1. Next, a current of 0.7A larger than a rated current of 0.68A is kept conducting for 20min unitl time t2 when a hermetic sealing process is to be started. Thus, the temperature of the oxide cathode is maintained at about 750 deg.C unitl the hermetic sealing process is started, and free barium generated by activation can be prevented from decreasing.
JP3532981A 1981-03-13 1981-03-13 Production method of crt Pending JPS57151143A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3532981A JPS57151143A (en) 1981-03-13 1981-03-13 Production method of crt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3532981A JPS57151143A (en) 1981-03-13 1981-03-13 Production method of crt

Publications (1)

Publication Number Publication Date
JPS57151143A true JPS57151143A (en) 1982-09-18

Family

ID=12438780

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3532981A Pending JPS57151143A (en) 1981-03-13 1981-03-13 Production method of crt

Country Status (1)

Country Link
JP (1) JPS57151143A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5248960A (en) * 1975-10-16 1977-04-19 Hewlett Packard Yokogawa Apparatus for activating cathode of cathodeerayytube
JPS542651A (en) * 1977-06-08 1979-01-10 Toshiba Corp Aging method for cathode-ray tube

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5248960A (en) * 1975-10-16 1977-04-19 Hewlett Packard Yokogawa Apparatus for activating cathode of cathodeerayytube
JPS542651A (en) * 1977-06-08 1979-01-10 Toshiba Corp Aging method for cathode-ray tube

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