Title:
GAP BONDING GLASS FOR MAGNETIC HEADS AND MAGNETIC HEAD
Document Type and Number:
WIPO Patent Application WO/2004/037736
Kind Code:
A1
Abstract:
There has been a problem with a PbO low-melting glass that it is inferior in water resistance and in reliability of bonding strength between gap materials when forming a magnetic gap of a magnetic head. A gap bonding low-melting glass for magnetic heads of the invention has a composition containing, in oxide terms, 5-14 weight% of SiO2, 3-15 weight% of B2O3, 4-22 weight% of ZnO, 55-90 weight% of Bi2O3, 0-4 weight% of Al2O3, 0-5 weight% of at least one kind selected from Li2O, Na2O, and K2O, and 0-12 weight% of at least one kind selected from MgO, CaO, SrO, and BaO. The gap bonding low-melting glass contains no PbO. By using this glass, the opposing faces of magnetic core halves are bonded, with a nonmagnetic gap material interposed therebetween. As a result, a magnetic head with no degradation of the magnetic characteristics due to high temperatures and with an excellent water resistance is produced.
Inventors:
KANAI MIKIE (JP)
HASEGAWA SHINYA (JP)
ADACHI HIROSHI (JP)
KAMIMOTO TETSUYA (JP)
HASEGAWA SHINYA (JP)
ADACHI HIROSHI (JP)
KAMIMOTO TETSUYA (JP)
Application Number:
PCT/JP2003/013339
Publication Date:
May 06, 2004
Filing Date:
October 17, 2003
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
KANAI MIKIE (JP)
HASEGAWA SHINYA (JP)
ADACHI HIROSHI (JP)
KAMIMOTO TETSUYA (JP)
KANAI MIKIE (JP)
HASEGAWA SHINYA (JP)
ADACHI HIROSHI (JP)
KAMIMOTO TETSUYA (JP)
International Classes:
C03C8/04; C03C3/066; C03C8/24; G11B5/127; G11B5/23; G11B5/235; (IPC1-7): C03C8/04; G11B5/127; G11B5/235
Foreign References:
| US6255239B1 | 2001-07-03 | |||
| JPH09278483A | 1997-10-28 | |||
| JP2002241143A | 2002-08-28 | |||
| JPH07121819A | 1995-05-12 | |||
| JPH11353609A | 1999-12-24 | |||
| JPH07282415A | 1995-10-27 |
Attorney, Agent or Firm:
Morimoto, Yoshihiro (4th Floor 10-10, Nishi-Hommachi 1-chome, Nishi-k, Osaka-shi Osaka, JP)
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