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. 30, 1996
Filed:
Nov. 10, 1993
Hiroshi Ide, Kodaira, JP;
Fumiyoshi Kirino, Tokyo, JP;
Tsuyashi Toda, Kodaira, JP;
Takeshi Maeda, Kokubunji, JP;
Hiroyuki Tsuchinaga, Kokubunji, JP;
Fumio Kugiya, Hachioji, JP;
Kazuo Shigematsu, Saitama, JP;
Seiichi Mita, Kanagawa, JP;
Atsushi Saito, Ichikawa, JP;
Toshimitsu Kaku, Sagamihara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An optical recording control method determines an optimum recording laser power by effecting a test recording before information to be recorded is recorded on a disk. The recording laser power is formed of a plurality of powers. A relationship among the plurality of laser powers is regulated by power level ratios between respective powers, whereby a power used when a laser light is radiated on the disk can be controlled to be constant independent of an ambient temperature and a structure of a disk. Therefore, accurate recording marks can be formed on the disk.