发明名称 |
PRODUCTION OF SHADOW MASK |
摘要 |
PURPOSE:To produce a shadow mask having no purity drift in the stage of producing the shadow mask from a thin sheet-like metallic plate consisting of iron and Ni by performing annealing in a vacuum and cooling in a reducing atmosphere. CONSTITUTION:Many apertures are punched to a thin sheet-like metallic plate consisting essentially of iron and Ni and the metallic plate is annealed at >=1,000 deg.C in a vacuum kept under <=10<-1>Torr. The metallic plate is then cooled in a reducing atmosphere by continuing charging of gaseous hydrogen until the furnace temp. decreases to 500 deg.C and thereafter the plate is cooled to form a black oxide film thereon. The yield point strength of the shadow mask is thus decreased and the deformation rate in the stage of press forming is suppressed; at the same time, the conversion of the shadow mask surface to a stainless steel is suppressed and the growth of the good oxide film is obtd. The shadow mask is kept stored in a deoxidizing atmosphere during the time after the end of annealing until formation of the black oxide film. |
申请公布号 |
JPS60194012(A) |
申请公布日期 |
1985.10.02 |
申请号 |
JP19840048145 |
申请日期 |
1984.03.15 |
申请人 |
TOSHIBA KK |
发明人 |
SUZUKI FUMIO;FUJINUMA MAKOTO;OOTAKE YASUHISA;INABA MICHIHIKO |
分类号 |
H01J9/14;C21D1/26;C21D6/00;C21D9/00 |
主分类号 |
H01J9/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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