JPS5497361A - Method and device for formation of shadow mask - Google Patents

Method and device for formation of shadow mask

Info

Publication number
JPS5497361A
JPS5497361A JP463578A JP463578A JPS5497361A JP S5497361 A JPS5497361 A JP S5497361A JP 463578 A JP463578 A JP 463578A JP 463578 A JP463578 A JP 463578A JP S5497361 A JPS5497361 A JP S5497361A
Authority
JP
Japan
Prior art keywords
shadow mask
die
punch
distance
flank
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.)
Granted
Application number
JP463578A
Other languages
Japanese (ja)
Other versions
JPS6028102B2 (en
Inventor
Giichi Moriyama
Kazuaki Hirabayashi
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
Priority to JP53004635A priority Critical patent/JPS6028102B2/en
Publication of JPS5497361A publication Critical patent/JPS5497361A/en
Publication of JPS6028102B2 publication Critical patent/JPS6028102B2/en
Expired 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

PURPOSE:To eliminate a color difference at the time when a picture tube is operating by making it possible to weld a shadow mask to a mask frame without curvature by making a flank-gap distance between a die and punch at the corner of the shadow mask wider than that at its circumference. CONSTITUTION:Aperture plate 1 is set to die 3 with outer circumference 7 supported. Next, punch 5 is pushed into concavity 2 of die 3 to press-form aperture plate 1, so that skirt part 7' of the shadow mask will be formed. In this case, the flank-gap distance between die 3 and punch 5 at corner part 12 is made greater than the plate thickness of the shadow mask by approximate 0.3 to 0.6mm, the distance at the center of long-side part 13 is made nearly equal to the plate thickness, and the distance at the center of short-side part 14 is greater than the plate thickness by approximate 0.2 to 0.4mm. In this way, a difference in distance is given between die 3 and punch 5 as shown by one-dot chain line 11 and then formation of it is done, so that the obtained shadow mask can be inserted into the flank of the mask frame without being curved.
JP53004635A 1978-01-18 1978-01-18 Shadow mask molding method and molding device Expired JPS6028102B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53004635A JPS6028102B2 (en) 1978-01-18 1978-01-18 Shadow mask molding method and molding device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53004635A JPS6028102B2 (en) 1978-01-18 1978-01-18 Shadow mask molding method and molding device

Publications (2)

Publication Number Publication Date
JPS5497361A true JPS5497361A (en) 1979-08-01
JPS6028102B2 JPS6028102B2 (en) 1985-07-03

Family

ID=11589455

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53004635A Expired JPS6028102B2 (en) 1978-01-18 1978-01-18 Shadow mask molding method and molding device

Country Status (1)

Country Link
JP (1) JPS6028102B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4482334A (en) * 1981-09-10 1984-11-13 Tokyo Shibaura Denki Kabushiki Kaisha Method for making CRT shadow masks

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4482334A (en) * 1981-09-10 1984-11-13 Tokyo Shibaura Denki Kabushiki Kaisha Method for making CRT shadow masks

Also Published As

Publication number Publication date
JPS6028102B2 (en) 1985-07-03

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