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:
Aug. 24, 1993
Filed:
Feb. 03, 1992
Tomohisa Yoshimaru, Yokohama, JP;
Tsuneshi Yokota, Kawasaki, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An information recording medium of this invention comprises a plurality of concentric tracks or a spiral track, having a plurality of recording tracks for recording information, and record pits formed on the recording tracks, said record pits being formed at a predetermined pitch on an innermost recording track, and said record pits being formed in accordance with movement of a position of a target recording track from the innermost track toward an outermost track, while gradually increasing the predetermined pitch at a rate less than that at which linear velocity increases when said information recording medium is rotated at a constant velocity.