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:
Mar. 30, 2010
Filed:
Mar. 16, 2005
Applicant:
Kohji Takeuchi, Kanagawa, JP;
Inventor:
Kohji Takeuchi, Kanagawa, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B 7/0045 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method of writing multi-level data to a recording medium is disclosed. The multi-level data is written by the emission of light beam. The method is characterized in that a write waveform that controls the emission of the light beam includes a first top pulse, an off pulse, and an erase pulse. The method is further characterized in that, if the value of the multi-level data falls in a predetermined range, a second top pulse is inserted between the first top pulse and the erase pulse of the write waveform that controls the emission of the light beam to write the value.