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Patent Searching and Data


Title:
GLASS SPACER AND HARD DISC DRIVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/066086
Kind Code:
A1
Abstract:
The purpose of the present invention is to prevent adhesion between a magnetic disc and a spacer when removing the magnetic disc and the spacer from a hard disc drive device where the magnetic disc and the spacer are installed. The surface roughness Ra on the principal surface of the ring-shaped glass spacer in contact with the magnetic disc in the hard disc drive device is set to 1.0 µm or less and the average inclination R∆a of the principal surface is set to 0.02 or greater.

Inventors:
TAKANO, Masao (6-10-1 Nishi-Shinjuku Shinjuku-k, Tokyo 47, 〒1608347, JP)
EDA, Shinji (Plot A-9, Thang Long Industrial Park II Lieu Xa Commune, Yen My Distric, Hung Yen Province ., VN)
Application Number:
JP2018/036747
Publication Date:
April 04, 2019
Filing Date:
October 01, 2018
Export Citation:
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Assignee:
HOYA CORPORATION (6-10-1 Nishi-Shinjuku, Shinjuku-ku Tokyo, 47, 〒1608347, JP)
International Classes:
G11B23/00; G11B5/65; G11B17/038; G11B25/04
Foreign References:
JP2003272336A2003-09-26
JP2008293552A2008-12-04
JP2008090900A2008-04-17
JPS62175980A1987-08-01
Attorney, Agent or Firm:
GLOBAL IP TOKYO (CARMEL II, 8-3-30 Nishi-Shinjuku, Shinjuku-k, Tokyo 23, 〒1600023, JP)
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