STEEL SHEET FOR INNER MAGNETIC SHIELD AND METHOD OF PRODUCING THE SAME, INNER MAGNETIC SHIELD, AND COLOR CATHODE RAY TUBE

WIPO Patent Application WO/2003/070997

A1

A steel sheet for inner magnetic shield made so that the ratio of non-hysteretic magnetic permeability between rolling direction and direction normal to rolling direction is not more than 0.7 or not less than 1.4, or preferably not more than 0.5 or not less than 2.0, the higher of these non-hysteretic magnetic permeability values being 18000 or above. And the individual surfaces are joined along the edges of a substantially quadrangular prism frustum, and the region of the steel sheet having the higher non-hysteretic magnetic permeability is positioned parallel with the horizontal surface direction of a screen shorter-side member, or additionally, it is positioned parallel with the horizontal surface direction of a screen longer-side member, thereby constituting an inner magnetic shield.

MATSUOKA HIDEKI (JP)
SUGIHARA REIKO (JP)
TAHARA KENJI (JP)
KUBO NORIKO (JP)
FUKUMIZU KEISUKE (JP)
TAKEUCHI TERUO (JP)
KATO HIROAKI (JP)

PCT/JP2003/001731

August 28, 2003

February 18, 2003

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NIPPON KOKAN KK (JP)
SONY CORP (JP)
MATSUOKA HIDEKI (JP)
SUGIHARA REIKO (JP)
TAHARA KENJI (JP)
KUBO NORIKO (JP)
FUKUMIZU KEISUKE (JP)
TAKEUCHI TERUO (JP)
KATO HIROAKI (JP)

C21D8/12; C22C38/00; C22C38/02; B21B3/00; C22C38/04; C22C38/12; H01F1/16; H01J29/02; H01J29/06; B21B3/02; (IPC1-7): C22C38/06; C21D8/12; B21B3/00; H01F1/16

WO2001012863A1

2001-02-22

EP1126041A1	2001-08-22
JP2001240946A	2001-09-04
JP2001316768A	2001-11-16
JP2000160252A	2000-06-13
JP2000169945A	2000-06-20

Takayama, Hiroshi (Shin-Yokohama IC Building 18-9 Shin-Yokohama 3-chome Kohoku-k, Yokohama-shi Kanagawa, JP)

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