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:
Jan. 01, 1991
Filed:
Apr. 08, 1988
Hiroshi Yasuoka, Kokubunji, JP;
Masahiro Ojima, Tokyo, JP;
Motoyasu Terao, Tokyo, JP;
Tetsuya Nishida, Koganei, JP;
Keikichi Andoo, Musashino, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An information recording method and apparatus therefor utilizes an information recording medium having a recording film enabling reversible phase change. The information recording medium is irradiated with an energy beam while relatively moving the information recording medium and the energy beam so as to at least enable recording of information in accordance with phase state changes of the recording film caused by irradiation of the energy beam. The energy beam is modulated so that an intensity of the energy beam obtains a first level having a high power for one portion of coded data information to be recorded, obtains a second level different from the first level for a predetermined time for another portion of the coded data information, and then again obtains the first level to enable recording of the coded data information independently of a previous recording state on the information recording medium.