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:
Apr. 06, 2010
Filed:
Nov. 18, 2005
Fuyuki Miyazawa, Gunma, JP;
Yoshikazu Sato, Gunma, JP;
Isao Matsuda, Gunma, JP;
Tetsuharu Kubo, Gunma, JP;
Katsuhiro Oyama, Gunma, JP;
Hiroya Kakimoto, Gunma, JP;
Fuyuki Miyazawa, Gunma, JP;
Yoshikazu Sato, Gunma, JP;
Isao Matsuda, Gunma, JP;
Tetsuharu Kubo, Gunma, JP;
Katsuhiro Oyama, Gunma, JP;
Hiroya Kakimoto, Gunma, JP;
Taiyo Yuden, Co., Ltd., Tokyo, JP;
Abstract
It is an object of the present invention to improve a margin to meet good recording quality by conducting a realtime correction of a recording condition of a medium with different recording characteristics for inner and outer circumferences. To accomplish the object, control factors for power and a pulse width are independently detected and corrected using an mT pulse having a length of m'T as a pulse for power control and an nT pulse having a length of n′T as a pulse for pulse width control; more specifically, power correction for mT pulse and pulse width correction for nT pulse are conducted in realtime, wherein a recording pulse stream including the mT pulse and nT pulse is irradiated onto a medium by a recording laser beam as well as pits and spaces formed by irradiation of the recording pulse stream are reproduced by a reproducing laser beam to detect the effects of power and pulse width variations independently.