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:
May. 24, 2005
Filed:
May. 27, 2003
Isamu Kuribayashi, Tokyo, JP;
Masanori Shibahara, Tokyo, JP;
Hajime Utsunomiya, Tokyo, JP;
Toshiki Aoi, Tokyo, JP;
Isamu Kuribayashi, Tokyo, JP;
Masanori Shibahara, Tokyo, JP;
Hajime Utsunomiya, Tokyo, JP;
Toshiki Aoi, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
The optical recording medium of the present invention is a phase change optical recording medium which can be used as a write once medium and which can be recorded at a high recording density. The optical recording medium of the present invention is adapted for recording such that, when the recording beam has a wavelength of λ, and objective lens of recording optical system has a numerical aperture of NA, minimum record marks formed are circular or ellipsoidal marks having a length of 0.4 λ/NA or less; and the medium is a write once medium wherein the recorded information can not be erased or rewritten at the minimum linear velocity used.