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US006268978B1
(12) United States Patent ao) Patent No.: us 6,268,978 Bi
Tani et al. (45) Date of Patent: Jul. 31,2001
(54) MAGNETIC DISK APPARATUS
(75) Inventors: Hiroshi Tani, Kanagawa-ken; Hiroyuki Matsumoto, Chigasaki, both of (JP)
(73) Assignee: Hitachi, Ltd., Tokyo (JP)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 09/186,666
(22) Filed: Nov. 4, 1998
(30) Foreign Application Priority Data
Nov. 6, 1997 (JP) 9-303990
(51) Int. C I. G11B 21/21
(52) U.S. CI 360/135; 360/235.4; 428/65.4;
428/694 BP; 428/695
(58) Field of Search 360/135, 235.4,
360/235.8, 236.6; 428/65.3, 65.4, 65.5, 65.8, 141, 900, 336, 694 T, 694 TP, 694 TR, 694 BP, 694 BR, 695
(56) References Cited
U.S. PATENT DOCUMENTS
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5,219,652 * 6/1993 Shimasaki 428/323
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5,503,922 * 4/1996 Shimasaki et al 428/323
5,576,918 * 11/1996 Bar-Gadda et al 360/135
5,601,916 * 2/1997 Yamazaki et al 428/329
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6,017,605 * 1/2000 Yamazaki et al 428/65.3
FOREIGN PATENT DOCUMENTS
7-235040 * 9/1995 (JP) .
7-254132 * 10/1995 (JP) .
OTHER PUBLICATIONS
IEEE Transactions on Magnetics, vol. Mag-23, No. 5 pp. 2386-2387, Sep., 1987, "Lubrication Performance of Melamine Cyanurate Composite Lubricant for Think Film Disk Media", T. Miyamoto, et al.
Advances in Information Storage and Processing Systems, ASME, ISPS vol. 1, pp. 117-123, 1995, "Cyclic Phosphazenes as Advanced Lubricants for Thin Film Magnetic Media", D.J. Perettle, et al.
Japan Tribology Society, preliminary lecture collection, 1996-10, pp. 205-206.
Japan Tribology Society, preliminary lecture collection, 1996-5, pp. 50-52.
* cited by examiner
Primary Examiner—Brian E. Miller
(74) Attorney, Agent, or Firm—Kenyon & Kenyon
(57) ABSTRACT
A magnetic disk apparatus having excellent wear resistance and high reliability can be provided by arranging cylindrical or polygonal cylindrical protrusions or protrusions of honeycomb structure on at least one of a slider surface of the magnetic head and a surface of the magnetic disk and dispersing an additive 19 comprising spherical or polyhedral molecules or particles in the liquid lubricant 9 on the surface of the magnetic disk.
10 Claims, 10 Drawing Sheets
