Dynamic magnetic information storage or retrieval – Head – Coil
Patent
1996-12-10
1998-03-31
Levy, Stuart S.
Dynamic magnetic information storage or retrieval
Head
Coil
G11B 517
Patent
active
057345341
ABSTRACT:
A magnetic head is made by fixing together two head halves 9 and 39. Recesses 10 and 40 are formed in glass layers 4 and 34 on the substrates 1 and 31 respectively of the head halves, and spiral coil patterns 11 and 41 are formed in the recesses. Apart from their inner end portions 11a and 41a the coil patterns are covered by insulating protective films 23 and 53. A plurality of sloping surfaces 4b, 34b are formed on the glass layers 4 and 34 at the locations of the inner end portions of the coil patterns, whereby a plurality of projections 4a, 34a are formed. The angle of slope .theta. of the sloping surfaces is above 30.degree. and below 90.degree.. The coil patterns 11 and 41 comprise copper plating layers 19 and 39; because the coil pattern inner end portions lie on the projections 4a, 34a their surfaces are high and exposed at the surfaces of the insulating protective films 23, 53, and gold films 16 and 46 are formed thereon. These gold films connect to each other and connect the coil patterns 11 and 41 to form one coil.
REFERENCES:
patent: 4376337 (1983-03-01), Kobayasi et al.
patent: 4532620 (1985-07-01), Matsuda et al.
patent: 4738021 (1988-04-01), McClure
patent: 4774755 (1988-10-01), Yoshisato et al.
IBM Technical Disclosure Bulletin "Forming Windings on Cores", Brickl et al. vol. 11, No. 11, Apr. 1969.
Ohmori Hiroyuki
Shouji Mitsuharu
Sugiyama Yasunari
Yamamoto Tetsuya
Klimowicz William J.
Levy Stuart S.
Sony Corporation
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