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:
May. 02, 2000
Filed:
Jun. 03, 1999
Yoji Arita, Yokohama, JP;
Yuzo Seo, Yokohama, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
A method for conducting data writing/reading-out utilizing a contact start and stop (CSS) system is provided. The system includes a magnetic disc having a data zone for writing/reading-out of data and a contact start and stop (CSS) zone having a taking-off/landing region, and a stopping region for contact start and stop operation of a magnetic head. A plurality of projections are provided in the CSS zone such that the relative height of the projections in the taking-off/landing region decreases in the radial outward direction from the center of the magnetic disc toward the data zone. An average gradient for the height of the projections in the taking-off/landing zone is between about 1.times.10.sup.-6 and about 5.times.10.sup.-5. Further, the maximum height of the projections in the CSS zone is greater than the flying height of the magnetic head in the data zone, and the minimum height of the projections in the CSS zone is lower than the flying height of the magnetic head in the data zone. The system also includes a contact-head for seeking and for spinning down/spinning up disc rotations on the sloped projections. Recording/reading operations are accomplished by flying the magnetic head at a height lower than the maximum height of the projections.