Magnetic head

Details Magnetic head Magnetic head

1992-04-06

1993-06-29

Bell, Mark L.

Dynamic magnetic information storage or retrieval

Head

Core

501 75, 501 76, 360126, 360127, G11B 5127

Patent

active

052240010

ABSTRACT:
A magnetic head comprising magnetic core halves which are sealed with a sealing glass which consists essentially of 10 to 25% by weight of SiO.sub.2, 55 to 80% by weight of PbO, 1 to 15% by weight of CdO, 0 to 10% by weight of B.sub.2 O.sub.3, 0 to 5% by weight of ZnO, 0 to 5% by weight of Al.sub.2 O.sub.3, 0 to 5% by weight of Na.sub.2 O, and 0 to 10% by weight of K.sub.2 O, provided that a total content of Na.sub.2 O and K.sub.2 O does not exceed 10% by weight, has a coefficient of thermal expansion of from 90.times.10.sup.-7 /.degree. C. to 110.times.10.sup.-7 /.degree. C. in a temperature range between 30.degree. C. and 300.degree. C., a working temperature of 600.degree. C. or lower and water resistance of the second class or higher, which glass is not deeply colored and is not devitrified during the assembly of the magnetic head.

REFERENCES:
patent: 2245541 (1941-06-01), Goodwin
patent: 3418156 (1986-12-01), Medert et al.
patent: 3723835 (1973-03-01), Davis et al.
patent: 4158081 (1979-06-01), Wexell
patent: 4711018 (1987-12-01), Matsuzawa
patent: 4811147 (1989-03-01), Kawai et al.
patent: 4972285 (1990-11-01), Otomo et al.
patent: 5031063 (1991-07-01), Hasegawa
patent: 5055957 (1991-10-01), Daughenbaugh et al.
"Technical Study Reports of the Electronics, Information and Communication Society", MR-86-4, pp. 25-32, May 1986.
"Technical Study Reports of the Electronics, Information and Communication Society", MR-87-14, pp. 1-8, Aug. 1987.
"National Technical Report", vol. 37, No. 4, 498-505 (1991).
"Chemical Abstracts", vol. 95, No. 20 (Nov. 16, 1981), col. 174234f.
"Chemcial Abstracts", vol. 111, No. 6 (Aug. 7, 1989), col. 44189h.

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