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:
Nov. 25, 2008
Filed:
Jun. 07, 2006
Tatsuya Tomura, Tokyo, JP;
Tsutomu Sato, Tokyo, JP;
Soh Noguchi, Tokyo, JP;
Yasunobu Ueno, Tokyo, JP;
Tatsuya Tomura, Tokyo, JP;
Tsutomu Sato, Tokyo, JP;
Soh Noguchi, Tokyo, JP;
Yasunobu Ueno, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A recording and reproducing method, wherein, on recording and reproduction of a recordable DVD medium, which has a recording layer containing an organic dye on a substrate having a guide groove with wobble, wherein linear velocity conditions for CLV recording is recorded on the substrate, recording starts at a linear velocity less than a highest linear velocity at the innermost circumference; when the linear velocity is switched over to the highest linear velocity on the way, a comparison is made between an optimum recording power of Po at the highest recording velocity that is temporarily optimized by test-writing in a power measurement area at the outermost circumference and an optimum recording power of Pi at the highest linear velocity that is recorded in the substrate; in the case of Po>Pi, a value given by the formula of '(Po+Pi)/2+(Po−Pi)Pi' is employed as a recording power with which recording starts at the highest linear velocity; and in the case of Po≦Pi, Pi is employed.