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:
Jan. 23, 2007
Filed:
Oct. 16, 2002
Jacobus Petrus Josephus Heemskerk, Eindhoven, NL;
Cornelis Marinus Schep, Eindhoven, NL;
Aalbert Stek, Eindhoven, NL;
Shigeru Furumiya, Hyogo, JP;
Hiromichi Ishibashi, Osaka, JP;
Junichi Minamino, Nara, JP;
Hiroshi Ogawa, Tokyo, JP;
Shin Masuhara, Tokyo, JP;
Tatsushi Sano, Tokyo, JP;
Jacobus Petrus Josephus Heemskerk, Eindhoven, NL;
Cornelis Marinus Schep, Eindhoven, NL;
Aalbert Stek, Eindhoven, NL;
Shigeru Furumiya, Hyogo, JP;
Hiromichi Ishibashi, Osaka, JP;
Junichi Minamino, Nara, JP;
Hiroshi Ogawa, Tokyo, JP;
Shin Masuhara, Tokyo, JP;
Tatsushi Sano, Tokyo, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Sony Corporation, Tokyo, JP;
Abstract
The S/N ratio is improved for recording data to grooves (--) of an optical disc so that as much information as possible can be recorded at the lowest possible frequency band. An optical disc using wobble patterns to record different information has a first groove (-) having a first wobble pattern () in which one wobble period has a sharp rising edge and a gradual falling edge; and a second groove (-) having a second wobble pattern () in which one wobble period has a gradual rising edge and a sharp falling edge. Each of the first and the second wobble pattern is represented by a first fundamental and a second harmonic of a Fourier series. The polarity of the second harmonic, which is an even harmonic, of the second wobble pattern is opposite that of the first wobble pattern. A method for manufacturing this optical disc is also provided.