The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 16, 2003
Filed:
Dec. 20, 2001
Mikio Tokuyama, Tsukuba, JP;
Hayato Shimizu, Ryugasaki, JP;
Satomitsu Imai, Odawara, JP;
Shozo Saegusa, Chiyoda, JP;
Masahiko Sega, Hiratsuka, JP;
Toshihisa Okazaki, Odawara, JP;
Yuzo Yamaguchi, Shimonoseki, JP;
Masao Iwakura, Odawara, JP;
Shigeo Nakamura, Odawara, JP;
Kazuo Sakai, Chiyoda, JP;
Shigenori Togashi, Abiko, JP;
Masayuki Kaiho, Chiyoda, JP;
Toshiaki Kobari, Chiyoda, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a magnetic disc apparatus including a plurality of magnetic discs mounted on a spindle, arms supporting magnetic heads, a rotary actuator for the arms, and a housing having an arcuate-shaped shroud, the improvement wherein gaps between the shroud and the sides of outer peripheries of the magnetic discs are larger than 0.1 mm and less than 0.6 mm. An open space is located, downstream of the arms with respect to the air flow on surfaces of the magnetic discs, the open space being devoid of the shroud. An opening is provided in the shroud, upstream of the arms with respect to the air flow and having a greater width than a width of the gaps defined between the magnetic discs and the shroud, and a bypass channel is provided which communicates between the opening and open space.