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. 06, 2003
Filed:
Mar. 04, 2002
Hiroshi Takino, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
A magnetic disc rotates causing an air flow that produces a floating force head unit which undergoes floating force by air flow produced as the result of the fact that the magnetic disc is rotated serves to selectively carry out loading of a first disc cartridge within which there is accommodated a first magnetic disc adapted so that flat recording tracks are provided at a disc substrate formed by molding synthetic resin and a magnetic layer is provided in a manner to cover the recording tracks, and a second disc cartridge within which there is accommodated a second magnetic disc adapted so that information uneven pit trains are formed at a disc substrate formed by molding synthetic resin and a magnetic layer is formed in a manner to include bottom surfaces and upper surfaces of information uneven pit trains, the magnetic layer being magnetized in the state where magnetization direction of the magnetic layer portions on the bottom surfaces and that of the magnetic layer portions of the upper surfaces of information pit trains are different from each other so that information such as program, etc. are recorded. Thus, new program can be installed into computer only by exchange of the disc cartridge.