Magnetic head

Details Magnetic head Magnetic head

1994-12-13

1997-02-25

Resan, Stevan A.

Dynamic magnetic information storage or retrieval

Head

Core

360103, 360122, 501 41, 501 49, 428692, G11B 5127

Patent

active

056064799

ABSTRACT:
A magnetic head of the present invention includes a pair of substrates which are formed of ferrite and sealed with sealing glass, wherein an averaged thermal expansion ratio of the sealing glass in the range of 30.degree. C. to a setting temperature .alpha..sub.Ts (glass) is smaller than an averaged thermal expansion ratio of the substrate in the range of 30.degree. C. to a setting temperature .alpha..sub.Ts (substrate); and a difference between a thermal expansion ratio at a glass transition temperature of the sealing glass and a thermal expansion ratio at a yielding temperature thereof is 2.times.10.sup.-3 or less.

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patent: 5245492 (1993-09-01), Mizuno et al.
patent: 5273948 (1993-12-01), Yamazaki et al.
Kishii, New Glass Technology, 1(3), 1982, pp. 23-31, "Setting Temperature".
Japanese Industrial Standard, JIS, R3102-1978, "Testing Method for Average Linear Thermal Expansion of Glass".
Tang, "Stress Analysis of Glass-Bonded Ferrite `Recording Heads`", IBM Journal of Research & Develpment, vol. 18, No. 3, May 1974, pp. 274-78.
Search Report for European Appl. 93106473.7, mailed Jul. 8, 1993.
Glass Handbook, Pub. by K. Asakura, Sep. 30, 1975, pp. 138-139, "6.2 Stress Generated in Sealed Substance".
Tuchihashi, Chemistry of Glass, Apr. 24, 1972, pp. 120-121, "Differential Thermal Analysis of Glass".

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