摘要:
A multi-layer structure whose volume changes when a temperature exceeds a predetermined threshold value, a microscopic structure drawing method that involves emitting a laser beam onto the multi-layer structure to create a temperature distribution within a beam spot and performing microscopic recording on a portion of the beam spot having a temperature higher than the threshold value, an optical disc master, and a mastering method using the same, where the multi-layer structure includes a substrate and a transformation layer formed on the substrate, wherein a volume of a portion of the transformation layer irradiated by a laser beam changes when the temperature of the portion exceeds a predetermined temperature. The microscopic structure drawing method includes emitting the laser beam onto a predetermined region of the transformation layer and heating the region of the transformation layer irradiated by the laser beam beyond a predetermined temperature so that the heated region can undergo a volume change.
摘要:
An information storage medium containing recording marks with a size below a resolution limit of an incident beam emitted from an information reproducing apparatus, the information storage medium including a reference signal, recorded in the form of data, to compensate for signal degradation due to defocus or tilt, and a method and apparatus to reproduce information from the information storage medium.
摘要:
A super-resolution information recording medium, a recording/reproducing apparatus, and a recording/reproducing method uses an information recording medium provides a super-resolution effect by fluid bubbles. The fluid bubbles are formed in at least a portion of the medium by a light beam radiated to reproduce a signal from the information recording medium. Accordingly, the super-resolution information recording medium has improved optical characteristics, so that better recording/reproduction is possible.
摘要:
An optical recording medium includes a substrate, a first dielectric layer, a recording layer, a second dielectric layer, a super-resolution layer, and a third dielectric layer, which are provided in that order. The super-resolution layer is formed of a material configured such that voids are generated when the material is irradiated with DC light at a predetermined irradiation power for 1 to 300 seconds. Therefore, super-resolution reproduction can be made such that the irradiation power of a readout laser beam does not depend on the size of a recording mark.
摘要:
An optical recording medium includes a substrate, a first dielectric layer, a recording layer, a second dielectric layer, a super-resolution layer, and a third dielectric layer, which are provided in that order. The super-resolution layer is formed of a material configured such that voids are generated when the material is irradiated with DC light at a predetermined irradiation power for 1 to 300 seconds. Therefore, super-resolution reproduction can be made such that the irradiation power of a readout laser beam does not depend on the size of a recording mark.
摘要:
A method of and an apparatus for generating a block-based low density parity check (LDPC) matrix, where calculation of an inverse matrix is not necessary and back-substitution is possible over the entire matrix area, and a recording medium having recorded thereon code for implementing the method. An area of the LDPC matrix is vertically divided based on respective lengths of first and second parity bit vectors and, a block-based matrix is generated such that a double diagonal matrix is arranged in an upper portion of an area corresponding to the second parity bit vector among areas into which the LDPC matrix is vertically divided., The area of the LDPC matrix is horizontally divided based on a position of the double diagonal matrix, and block-based matrices are generated in the divided areas of the LDPC matrix, to satisfy a condition that column weights (Wc) are uniform.
摘要:
A super resolution information storage medium, a method of making reproducing signals stable, and an apparatus for recording and/or reproducing data on a super resolution information storage medium. The information storage medium on which information is recorded as marks smaller than a resolution of an incident beam, includes a substrate, a super resolution layer formed on the substrate and generating a thermal reaction at portions where the incident beam is focused, and a phase change layer formed on or under the super resolution layer and crystallized before reproducing the recording marks.
摘要:
A method of and apparatus for reproducing information recorded in a super resolution information storage medium (SRISM) using an appropriate actual reproduction power, which is actually appropriate for reproduction, by actively detecting a threshold region that varies according to the reflectivity of the SRISM are provided. The method of reproducing information from an SRISM includes: radiating a light beam onto the SRISM, while varying a reproduction power of the laser beam, receiving the light beam reflected by the SRISM, and detecting a change in the level of a reproduction signal from the received light beam; calculating, based the change in the level of the reproduction signal, a reference reproduction power at which the gradient of a graph of the levels of the reproduction signal with respect to the reproduction power changes; and setting the actual reproduction power based on the reference reproduction power. The apparatus for reproducing information from an SRISM includes: an optical pickup unit including a light source which radiates a light beam having a range of power onto the SRISM, and a photodetector which receives the light beam reflected from the SRISM and detects a reproduction signal from the received light beam; and a signal processing unit which detects a change in the level of the reproduction signal according to a change in the reproduction power of the light beam radiated onto the SRISM by the light source and sets the actual reproduction power of the light beam emitted from the light source based on a reference reproduction power at which the gradient of a graph of the levels of the reproduction signal with respect to the reproduction power changes.
摘要:
A super resolution optical recording medium for preventing degradation of a reproducing signal, includes a substrate, a super resolution layer formed on the substrate, and having a super resolution aperture formed thereon. The super resolution aperture has a size smaller than a resolution limit of an emitted beam incident on the super resolution layer, and a recording layer disposed on a lower part or an upper part of the super resolution layer. A reaction temperature at which recording of the recording layer is performed, is higher than a super resolution temperature at which the super resolution aperture is formed. Accordingly, the degradation of the reproducing signal can be prevented remarkably improving the number of times information can be reproduced.
摘要:
A super-resolution information storage medium and a method and apparatus for recording and/or reproducing data to and/or from the same, the super-resolution information storage medium designed to allow reproduction of information recording marks smaller than a resolution limit of an incident beam and includes a substrate, a recording layer formed on the substrate and having recording marks formed due to thermal decomposition at a portion on which the incident beam is focused, and a super-resolution layer formed on the recording layer using a material having a melting point lower than the thermal decomposition temperature of the recording layer. The super-resolution information storage medium has a super-resolution layer made of a material having a melting point lower than the thermal decomposition temperature of the recording layer so that the recording layer is not adversely affected due to repeated irradiation with a readout beam, thereby providing improved readout performance.