JPS57134847A - Shadow mask - Google Patents

Shadow mask

Info

Publication number
JPS57134847A
JPS57134847A JP2005781A JP2005781A JPS57134847A JP S57134847 A JPS57134847 A JP S57134847A JP 2005781 A JP2005781 A JP 2005781A JP 2005781 A JP2005781 A JP 2005781A JP S57134847 A JPS57134847 A JP S57134847A
Authority
JP
Japan
Prior art keywords
shadow mask
acid gas
braun tube
mask
temperature
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
JP2005781A
Other languages
Japanese (ja)
Inventor
Heihachiro Midorikawa
Masahiko Ito
Akira Minato
Shigemi Hirasawa
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 JP2005781A priority Critical patent/JPS57134847A/en
Publication of JPS57134847A publication Critical patent/JPS57134847A/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
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
    • H01J9/142—Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes
    • H01J9/146—Surface treatment, e.g. blackening, coating

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

PURPOSE:To provide a black film with high corrosion resistance over the surface of a color Braun tube, especially over the surface of a mask or frame made of an iron plate. CONSTITUTION:A shadow mask made of carbon steel is subjected to high- temperature oxidation at temperature in the range of 500-575 deg. in an atmospher, which principally consists of carbon dioxide gas, water and oxygen and contains below 200ppm of nitrous acid gas and below 10ppm of sulfurous acid gas, so that an extremely dense blackened film which has a high photographic density and a good characteristic necessary for a Braun tube shadow mask is obtained.
JP2005781A 1981-02-16 1981-02-16 Shadow mask Pending JPS57134847A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005781A JPS57134847A (en) 1981-02-16 1981-02-16 Shadow mask

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005781A JPS57134847A (en) 1981-02-16 1981-02-16 Shadow mask

Publications (1)

Publication Number Publication Date
JPS57134847A true JPS57134847A (en) 1982-08-20

Family

ID=12016444

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005781A Pending JPS57134847A (en) 1981-02-16 1981-02-16 Shadow mask

Country Status (1)

Country Link
JP (1) JPS57134847A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01239736A (en) * 1988-03-22 1989-09-25 Hitachi Ltd Formation of shadow mask structure and oxide film of frame
KR19980020317A (en) * 1996-09-06 1998-06-25 손욱 Photosensitive resin composition and method of forming pattern using same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01239736A (en) * 1988-03-22 1989-09-25 Hitachi Ltd Formation of shadow mask structure and oxide film of frame
KR19980020317A (en) * 1996-09-06 1998-06-25 손욱 Photosensitive resin composition and method of forming pattern using same

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