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:
Oct. 27, 2009
Filed:
Aug. 02, 2005
Hidehiko Kando, Matsudo, JP;
Hiroyuki Minemura, Kokubunji, JP;
Hidehiko Kando, Matsudo, JP;
Hiroyuki Minemura, Kokubunji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A method of generating a recording pulse train in accordance with a NRZI signal for recording information to a recording medium by irradiating a pulse chain including a first pulse, a middle pulse chain, a last pulse and a negative pulse following the last pulse, including adjusting an average power of the first pulse to a designated peak power level, adjusting an average power of the middle pulse chain to a designated peak power level, adjusting an average power of the last pulse to a designated power level, adjusting an average power of the negative pulse to a designated power level that is lower than the peak power level, and controlling a leading edge of the first pulse of the recording pulse train to start with a variable lapse of time from a leading edge of the NRZI signal, with a duration of the first pulse being fixed.