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:
Oct. 03, 2001
Shigeaki Furukawa, Kadoma, JP;
Kenichi Nishiuchi, Hirakata, JP;
Tetsuya Akiyama, Hirakata, JP;
Kenji Narumi, Ibaraki, JP;
Shigeaki Furukawa, Kadoma, JP;
Kenichi Nishiuchi, Hirakata, JP;
Tetsuya Akiyama, Hirakata, JP;
Kenji Narumi, Ibaraki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An optical recording medium of the present invention includes a substrate (), a protection plate (), and a plurality of information layers () sandwiched between the substrate and the protection plate. An information signal is recorded as a length of a mark and a length of a space between two marks. The mark is formed when the information layer is irradiated by light received through the substrate. The information layers have a management region () recording a leading edge recording condition and a trailing edge recording condition. The leading edge recording condition is used to change a recording start position for forming a leading edge of the mark. The trailing edge recording condition is used to change a recording end position for forming a trailing edge of the mark. Each of the leading and trailing edge recording condition is depending on which information layer is recorded.