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:
May. 05, 2015
Filed:
Feb. 19, 2004
Hiroshi Tabata, Mito, JP;
Kazuo Yonehara, Hitachinaka, JP;
Yasuhiro Ueki, Sagamihara, JP;
JVC Kenwood Corporation, Yokohama-Shi, Kanagawa, JP;
Abstract
A mark having a length nT (n being an integer equal to or greater than 3 and T being a clock period) is formed by modulating irradiation laser power with three values of recording power Pw, erase power Pe, and bias power Pb (Pw>Pe>Pb). Constant strength periods (A) of the recording power Pw are set as AT, AT, . . . , and AT and constant strength periods (B) of the bias power Pb are set as BT, BT, . . . , BT, and CT (C=−1 to 3). The application of laser is divided into pulses in order of AT, BT, AT, BT, . . . , AT, BT, and CT (m=(n−k)/2, k=3 (if n is an odd number), or k=4 (if n is an even number)). (Here, the constant strength period of the recording power Pw for n=3, n=4, n≧5 (odd number), and n≧6 (even number) is set as A, A, A, and A, the constant strength period of the bias power Pb for n=3, n=4, n≧5 (odd number), and n≧6 (even number) is set as B, B, B, and B, and then, A+B=A+B=A+B=2T and A+B=A+B=3T).