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:
Sep. 11, 2018
Filed:
Dec. 21, 2012
Applicant:
Hitachi, Ltd., Tokyo, JP;
Inventors:
Manabu Shiozawa, Tokyo, JP;
Yasuhiko Shimotsuma, Kyoto, JP;
Masaaki Sakakura, Kyoto, JP;
Kiyotaka Miura, Kyoto, JP;
Miki Nakabayashi, Kyoto, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/0065 (2006.01); G11C 13/04 (2006.01); G11B 7/128 (2012.01); G11B 7/0045 (2006.01); G11B 7/013 (2006.01);
U.S. Cl.
CPC ...
G11C 13/042 (2013.01); G11B 7/0065 (2013.01); G11B 7/00455 (2013.01); G11B 7/013 (2013.01); G11B 7/128 (2013.01); G11C 13/048 (2013.01);
Abstract
In a recording technique in which a plurality of light spots are simultaneously formed by using an ultra-short pulse laser and a spatial phase modulator, and a plurality of recording dots having refractive indexes different from those of the vicinities thereof are formed inside a recording medium, it is hard to make recording quality and a recording density compatible. Therefore, a plurality of dots are recorded at a predetermined dot pitch, and then other dots are recorded between the recorded dots.