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. 15, 2005
Filed:
May. 20, 2003
Hisamitsu Kamezaki, Kanagawa, JP;
Ippei Ogawa, Kanagawa, JP;
Hisamitsu Kamezaki, Kanagawa, JP;
Ippei Ogawa, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An information recording medium including a transparent substrate, and a recording layer or a metallic layer formed on the transparent substrate directly or through an undercoat layer, with an amplitude attenuation time of 1 second or less and/or a vibration frequency attenuation time of 3 seconds or less, when vibrated in the direction perpendicular to the flat surface of said information recording medium, or wherein when the information recording medium is in-plane vibrated in the direction perpendicular to the extending direction of information recording, reproducing and/or deleting tracks, a maximum in-plane deviation of a recording, reproducing or deleting position in the tracks in the perpendicular direction from a correct recording, reproducing or deleting position in the tracks is 12.5×d or less wherein d is an average distance between the adjoining tracks measured in the direction perpendicular to the extending direction of the tracks, and an acceleration of the information recording medium in the perpendicular direction is 0.25 m/sor less.