Patents by Inventor Eisuke Ishibashi

Eisuke Ishibashi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Optical disk device and emission current adjusting method for the same
    Patent number: 7313077
    Abstract: A ratio of an erase current and a peak current when starting recording is defined as K=iER/iPK (S1), and iER11 is set equal to K×iPK1, and an ideal value iER11 of an erase current that should be increased according to a temperature change is determined (S2). 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 iER1. By measuring this iER1, an ideal value iER11 of the erase current is subtracted from iER1, and the resultant current is defined as iBT11 (S3). This iBT11 is 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.
    Type: Grant
    Filed: January 13, 2005
    Date of Patent: December 25, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Eisuke Ishibashi, Yasuhiro Wada, Shinya Shimizu, Toshiya Akagi
  • Optical disk device and emission current adjusting method for the same
    Publication number: 20050157625
    Abstract: A ratio of an erase current and a peak current when starting recording is defined as K=iER/iPK (S1), and iER11 is set equal to K×iPK1, and an ideal value iER11 of an erase current that should be increased according to a temperature change is determined (S2). 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 iER1. By measuring this iER1, an ideal value iER11 of the erase current is subtracted from iER1, and the resultant current is defined as iBT11 (S3). This iBT11 is 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.
    Type: Application
    Filed: January 13, 2005
    Publication date: July 21, 2005
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Eisuke Ishibashi, Yasuhiro Wada, Shinya Shimizu, Toshiya Akagi