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:
Nov. 18, 2003
Filed:
Oct. 12, 1999
Hidehiko Kando, Matsudo, JP;
Takeshi Maeda, Kokubunji, JP;
Hiroyuki Minemura, Kokubunji, JP;
Tsuyoshi Toda, Kodaira, JP;
Yasushi Miyauchi, Akishima, JP;
Mitsuhide Miyamoto, Kokubunji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A recording medium in which information is to be recorded is permitted to get into a first state by a first power level of an energy beam and permitted to get into a second state by a second power level higher than the first power level of the energy beam. The information is recorded on the recording medium by moving the energy beam and the recording medium relatively to each other and irradiating the recording medium with the energy beam so that the first and second states are formed with predetermined lengths and at predetermined intervals on the recording medium. Four power levels (first, second, third and fourth power levels) are used as the power level of the energy beam. The information is recorded while the second power level is increased to times and the first, third and fourth power levels are increased to times. The information recorded as described above is reproduced, and reproductive jitter is observed. The magnification factors and are adjusted so that the value of the reproductive jitter is not larger than a predetermined value.