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1. IN5607/DELNP/2005 - HIGH-DENSITY RECORDING MEDIUM AND RECORDING AND/OR REPRODUCING DEVICE THEREOR

Office
India
Application Number 5607/DELNP/2005
Application Date 02.12.2005
Publication Number 5607/DELNP/2005
Publication Date 01.02.2008
Grant Number 240409
Grant Date 14.05.2010
Publication Kind B
IPC
G11B 7/24
GPHYSICS
11INFORMATION STORAGE
BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
7Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower power; Record carriers therefor
24Record carriers characterised by shape, structure or physical properties, or by the selection of the material 
Applicants LG ELECTRONICS INC
Inventors KIM, JIN YONG
PARK, KYUNG CHAN
Priority Data 10-2003-0035523 03.06.2003 KR
1020030040353 20.06.2003 KR
Title
(EN) HIGH-DENSITY RECORDING MEDIUM AND RECORDING AND/OR REPRODUCING DEVICE THEREOR
Abstract
(EN) Disclosed herein are a high-density recording medium, such as a high-density optical disc and a recording and/or reproducing device therefor. At a transition area of the high-density optical disc allocated between a clamping area and an information area of the high-density optical disc is formed a step having a prescribed slope so that the high-density optical disc does not collide with an objective lens of an optical pickup provided in an optical disc device although the objective lens of the optical pickup is upwardly moved toward a recording layer of the high-density optical disc until is moves to the maximum working distance when the high-density optical disc, such as a Blu-ray disc, is improperly placed on a turntable provided in the optical disc device, e.g., when the high-density optical disc is placed upside down on the turntable. The thickness of the information area is smaller than that of the clamping area by the provision of the step at the transition area. Consequently, damage to the high-density optical disc or the objective lens due to a collision of the objective lens with the high-density optical disc is prevented, and fatal errors of a servo operation are effectively prevented. Furthermore, the cost of materials required to manufacture the high-density optical disc is reduced while stable clamping force is maintained, and safe insertion of the high-density optical disc into a slot-type optical disc drive is possible.