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

No: 7484231
Nr. solicitare: 10145391
Data depunerii: 2002-05-13
Data eliberarii: 2009-01-27
Tip: B2
Revendicari: 26
Schite: 10
Rezumat: 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.
Clase SUA:
	No:720 - Dynamic optical information storage or retrieval  / No:697 - Mounting detail
Inventatori:
	Kim Jin Yong  (2)
	Park Kyung Chan  (1)
Examinator principal: Blouin Mark
Mandatari:
	Lee, Hong, Degerman, Kang & Schmadeka (ORG)  (357)
Cesionari:
	LG Electronics Inc. (ORG)  (3992)
Domeniu de cautare:
	Compound tools
Documente externe:
	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
Alte referinte:
	IBM Technical Disclosure Bulletin; “Frustrum-Shaped Optical Disk and Mating Receptacle” vol. 37 No. 11 Nov. 1994; p. 529.
Referinte:
	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