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:
Dec. 25, 2007
Filed:
Jan. 13, 2005
Eisuke Ishibashi, Oonojou, JP;
Yasuhiro Wada, Oonojou, JP;
Shinya Shimizu, Kadoma, JP;
Toshiya Akagi, Neyagawa, JP;
Eisuke Ishibashi, Oonojou, JP;
Yasuhiro Wada, Oonojou, JP;
Shinya Shimizu, Kadoma, JP;
Toshiya Akagi, Neyagawa, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A ratio of an erase current and a peak current when starting recording is defined as K=iER/iPK (S), and iER11 is set equal to K×iPK, and an ideal value iERof an erase current that should be increased according to a temperature change is determined (S). A value obtained by subtracting a current iBT at a bottom level emission intensity when starting recording from a current at an erase level emission intensity after the temperature rises is defined as iER. By measuring this iER, an ideal value iERof the erase current is subtracted from iER, and the resultant current is defined as iBT(S). This iBTis set as an adjustment value of the bottom current, and a value obtained by adding this adjustment value to a bottom current when starting recording is set as a bottom current after change.