Title:
【発明の名称】磁気ディスク装置
Document Type and Number:
Japanese Patent JP2867911
Kind Code:
B2
Abstract:
A magnetic disk drive is provided having at least one magnetic disk, a magnetic head for writing and reading data, and a vessel in which the magnetic disk and magnetic head are sealed. The vessel is filled with air, an inert gas, or a mixture of air and inert gas. A clearance distance is provided between the magnetic disk and a surface opposite thereto, which distance is not larger than 1.0 mm when the vessel is filled with air, 1.1 mm with helium, 1.7 mm with neon, 1.2 mm with argon, 1.4 mm with krypton, and 1.2 mm with xenon. In one preferred embodiment, there may be provided a plurality of grooves on the stationary surface opposite to the magnetic disk, or a fan in a rotary shaft of the magnetic disk, in order to direct air inwardly between the magnetic disk and the surface opposite thereto. By setting the clearance distance as small as possible, it is possible to reduce the thickness reduction of lubricant caused by shearing force of air flow along the magnetic disk surface. Also, by appropriately selecting the gases to be used, and by using the groove or fan structures, the clearance distance may be further reduced.
Inventors:
YANAGISAWA MASAHIRO
Application Number:
JP3666595A
Publication Date:
March 10, 1999
Filing Date:
February 24, 1995
Export Citation:
Assignee:
NIPPON DENKI KK
International Classes:
G11B5/60; G11B21/21; G11B25/04; G11B33/14; G11B33/08; (IPC1-7): G11B25/04
Domestic Patent References:
| JPS6259382A | ||||
| JPS55139674A | ||||
| JPH04106781A |
Attorney, Agent or Firm:
Naoki Kyomoto