High-density disk recording medium having an asymmetrically-shaped center hole and manufacturing method thereof

No: 7484231
No. de la demande: 10145391
Date d'archivage: 2002-05-13
Date d'emission: 2009-01-27
Genre: B2
Pretentions: 26
Feuilles de dessin: 10
Resume: The present invention relates to a high-density disk that is structured to prevent a collision of an optical pickup's objective lens with the high-density disk if the disk is placed upside down in a disk device that is able to record and reproduce signals to/from the high-density disk. A high-density disk recording medium according to the present invention is structured such that, wherein a recording layer having high-density pit patterns is offset from a center plane of disk thickness, a center hole of the disk recording medium is asymmetric in shape with respect to the center plane where, for example, both entrances of the center hole have mutually different diameters.
Classes d'Etats-Unis:
	No:720 - Dynamic optical information storage or retrieval  / No:697 - Mounting detail
Inventeurs:
	Kim Jin Yong  (2)
	Park Kyung Chan  (1)
Examinateur principal: Blouin Mark
Agents:
	Lee, Hong, Degerman, Kang & Schmadeka (ORG)  (357)
Cessionnaires:
	LG Electronics Inc. (ORG)  (3992)
Domaine de recherches:
	Compound tools
Documents etrangeres:
	0 284 387 / 1988-08-31
	1 152 407 / 2001-10-31
	1 258 873 / 2004-07-31
	61051632 / 1986-02-28 / Japan
	09-320159 / 1996-04-30 / Japan
	10-283683 / 1998-09-30 / Japan
	10-2001-0098871 / 2001-10-31 / South Korea
Autre references:
	IBM Technical Disclosure Bulletin; “Frustrum-Shaped Optical Disk and Mating Receptacle” vol. 37 No. 11 Nov. 1994; p. 529.
References:
	4954065
	5504735
	5572509
	5590115 - Optical disk and apparatus for manufacturing the same
	5862120
	6049522
	6212159
	6351449 - Optical disk with recesses inside an inner circumference of an information recording area and method of making same
	6495235 - Optical disk, substrate of the same, and mold for forming the substrate