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1. MXPA/a/2005/012992 - HIGH-DENSITY RECORDING MEDIUM AND RECORDING AND/OR REPRODUCING DEVICE THEREFOR

Office
Mexico
Application Number PA/a/2005/012992
Application Date 01.12.2005
Publication Number PA/a/2005/012992
Publication Date 16.05.2006
Publication Kind A
IPC
G11B 7/0037
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
002Recording, reproducing or erasing systems characterised by the shape of the carrier
0037with discs
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 JIN YONG KIM
KYUNG CHAN PARK
Agents MIGUEL A. ESTEVA*
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 THEREFOR
(ES) MEDIO DE GRABACION DE ALTA DENSIDAD Y DISPOSITIVO DE GRABACION Y/O REPRODUCCION PARA EL MISMO
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 it 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.
(ES) Se revela en la presente un medio de grabación de alta densidad, tal como un discoóptico de alta densidad y un dispositivo de grabación y/o reproducción para el mismo. En unárea de transición del discoóptico de alta densidad asignada entre unárea de sujeción y unárea de información del discoóptico de alta densidad se forma una grada que tiene una pendiente prescrita, de tal manera que el discoóptico de alta densidad no choca con la lente objetivo de un captadoróptico provisto en un dispositivo de discoóptico, aunque la lente objetivo del captadoróptico es movida hacia arriba hacia una capa de grabación del discoóptico de alta densidad, hasta que se mueve a la distancia de trabajo máxima cuando el discoóptico de alta densidad, tal como un disco Blu-ray, estácolocado inapropiadamente sobre un tornamesa provisto en el dispositivo de discoóptico, por ejemplo, cuando el discoóptico de alta densidad es colocado de cabeza sobre el tornamesa. El espesor delárea de información es más pequeña que aquella delárea de sujeción mediante la provisión de la grada en elárea de transición. Consecuentemente, se impiden los daños al discoóptico de alta densidad o la lente objetivo debido a la colisión de la lente objetivo con el discoóptico de alta densidad y se impiden errores fatales de una servo-operación. Además, se reduce el costo de los materiales requeridos para la manufactura del discoóptico de alta densidad, en tanto que se mantiene una fuerza de sujeción estable y es posible una inserción segura del discoóptico de alta densidad a una unidad de discoóptico tipo ranura.
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