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:
Mar. 20, 2007
Filed:
Nov. 18, 2003
Masashi Suenaga, Moriya, JP;
Yusuke Takahashi, Moriya, JP;
Katsunori Miyata, Yuki-gun, JP;
Toyoyuki Nunomura, Tsukuba-gun, JP;
Masashi Suenaga, Moriya, JP;
Yusuke Takahashi, Moriya, JP;
Katsunori Miyata, Yuki-gun, JP;
Toyoyuki Nunomura, Tsukuba-gun, JP;
Hitachi Maxell, Ltd., Ibaraki, JP;
Abstract
An optical information-recording medium has a plurality of lands and grooves formed on a substrate. In-groove pits are formed at the bottom of a part of the grooves. The widths of the in-groove pits in the radial direction of the substrate are suppressed from being widened irrelevant to the lengths in the groove direction. Predetermined shapes of the land and the groove are maintained for the shape of the land disposed adjacently to the in-groove pit without greatly eroding or scraping the side wall. A recording signal obtained from land prepits can be reliably detected on the optical information-recording medium manufactured by using the substrate formed with the land prepits disposed adjacently to the in-groove pits.