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. 26, 2000
Filed:
Sep. 21, 1999
Takashi Ishida, Yawata, JP;
Shin-ichi Tanaka, Tuzuki-gun, JP;
Akira Mutoh, Sakai, JP;
Yoshinari Takemura, Settsu, JP;
Shunji Ohara, Higashioska, JP;
Isao Satoh, Neyagawa, JP;
Abstract
One or more optical discs, each having a ROM field having information with a length of at least one track formed in convex and concave pit rows, and a rewritable field capable of rewriting the information with a length of at least one track, an information unrecorded field having a length of at least one track located between the ROM field and rewritable field, the rewritable field having a spiral or concentric guide track oscillating in a radial direction, the ROM field having spiral or concentric convex and concave pit rows, and at least a part field at the rewritable field side of the information unrecorded field has a transition field having a spiral or concentric guide track oscillating in the radial direction continuously or intermittently and a track pitch To of the ROM field and a track pitch Tw between grooves and lands of the rewritable field have values such that To>Tw.