摘要:
A method of optimizing a writing condition of an optical recording medium, including writing test pattern data with the writing condition on the optical recording medium, comparing an error pattern binary signal detected by reproducing the written test pattern data with a correct pattern binary signal of the test pattern data , and determining an optimum writing condition of the optical recording medium based on a result of the comparison.
摘要:
A method of determining an optimum reproduction condition of marks recorded on an optical recording medium that in which the length of at least one of the marks is smaller than a resolution of a pickup. The method includes obtaining an optimum reproduction condition of a mark having a length which closely approximates the resolution of the pickup, and determining the optimum reproduction condition of the marks using the obtained optimum reproduction condition.
摘要:
A data reproducing method reproducing data recorded in a super resolution information storage medium in a form of marks having magnitudes less than a resolving power of an incident light beam, and an apparatus thereof. The data reproducing method includes irradiating a first beam having a resolving power causing a super resolution phenomenon and a second beam having a resolving power not causing a super resolution phenomenon into different places on the information storage medium, detecting a first reproduction signal based on the first beam and a second reproduction signal based on the second beam, and compensating for and calculating a temporal delay between the first reproduction signal and the second reproduction signal. Therefore, a signal reflected from a peripheral area of a reproduction beam spot other than a super resolution area can be excluded, thereby improving reproduction signal characteristics.
摘要:
In the conventional super-resolution reproduction method, an optical spot size is changed by power of the laser beam applied to an optical disc and accordingly, it is necessary to decide an optimal laser power for super-resolution reproduction for each of the recording pattern sizes. The present invention provides an optical disc formed by a recording layer and a material layer having changing viscosity. When a laser beam is applied for reproducing information recorded in the recording layer, a part of a crystalline thin film of the material layer having changing viscosity is softened. The optical constant of the softened part is changed and a discontinuous plane of the optical constant is generated at the boundary of the softened part so as to form a ring-shaped peculiar region in the optical spot. By this ring-shaped peculiar region, it is possible to reproduce a recording pattern of size smaller than the resolution limit with a signal intensity equivalent to the recording pattern of a greater size.
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:
A simple-structured recording medium without a mask layer and information recording and reproducing methods, which resolve thermal stability related problems arising during reproduction, the recording medium including a high melting point recording layer between first and second dielectric layers. The method of recording information on the recording medium involves irradiating a laser beam onto the recording medium to induce reaction and diffusion in the high melting point recording layer and the first and second dielectric layers. The method of reproducing information recorded on such a super-resolution near-field recording medium by the above method involves generating plasmon using crystalline particles of the high melting point recording layer and the first and second dielectric layers as a scatter source to reproduce information regardless of a diffraction limit of a laser used.
摘要:
A phase change and/or magneto-optical recording method using laser induced reaction and diffraction in a recording layer and a dielectric layer of a recording medium, a recording medium recorded on using the method, and a recording and reproducing apparatus for the recording medium are provided. The phase change recording method involves changing absorption coefficients of optical constants of a recording layer and a dielectric layer of a recording medium by laser induced reaction and diffusion. The magneto-optical recording method involves changing the magnetization direction in a recording layer while the recording layer and a dielectric layer of a recording medium are irradiated with laser to induce reaction and diffusion therein. A recording method based on the physical properties of protruding record marks formed by laser induced reaction and diffusion in a recording layer and a dielectric layer is also provided.