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:
Aug. 08, 2006
Filed:
May. 23, 2003
Yoshio Sasaki, Saitama, JP;
Masatoshi Adachi, Saitama, JP;
Hiroyuki Uchino, Saitama, JP;
Yasuhiko Tominaga, Saitama, JP;
Yoshio Sasaki, Saitama, JP;
Masatoshi Adachi, Saitama, JP;
Hiroyuki Uchino, Saitama, JP;
Yasuhiko Tominaga, Saitama, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
The apparatus records information by irradiating a laser beam onto a recording medium and forming marks on the disc. Prior to the actual recording, the controller performs a test recording in which predetermined test recording data is recorded on the recording medium. In the test, data is recorded by generating a recording pulse signal based on the recording data and thereby driving a light source. While the test recording is performed, the level of a cooling pulse in the recording pulse signal is varied. Then, the test recorded data is reproduced to generate a reproduced signal. A waveform of the reproduced signal is evaluated, and a cooling level that provides a target asymmetry value is set as an optimum cooling level. Thus, the subsequent actual recording can be performed according to the optimum cooling level determined based on characteristics of the recording medium to be used for the actual recording.