36 results about "Cd recording" patented technology

The invention provides a parameter method and device of stencil-CD, which comprises the following steps: First, setting an initial parameter of stencil-CD; second, testing the stencil-CD method of the relative parameters according to experimental design; finally, selecting the optimum parameter and the relation of stencil-CD quality according to the stencil-CD test results.

In apparatus for recording on a compact disc (1), sub-data strings are recorded so that the main data strings are reproducible by an optical pickup (13) for reproducing the main data strings, and the main data strings are protected from being copied illegally without any adverse effect on reproduction of the pit-and-land main data strings. The sub-data string (ED) is recorded by locally changing the reflectance of the reflection film in the form of irregularities such as pits or marks at a timing which does not affect the position information of the edge.

The invention relates to a method for realizing real-time CD recording in a digital video recorder, comprising the steps of: (1) the establishing process of a data buffer; (2) the process of writing video data files in the buffer: 21) searching for the initialized buffer files in subsection when a certain branch in a path Q needs to start real-time recording, initializing next buffer file and covering the first buffer file when all the buffer files are used up; 22) writing the video and audio data stream compressed in the branch in the data file found in the step 21) according to file serial number; (23) executing the process of reading the video data in CD when the video time reaches T minute and simultaneously, switching from the path Q to the step 21) for continuing the read-in processof buffer data files; and (3) the process of writing video data files in CD. The invention has the beneficial effects of ensuring the fast availability of recorded CD at the end of the whole process as the data is recorded to the CD in the video process.

An optical disk apparatus for recording information of copyright on an optical disk where desired data are recorded by repetition of pits or marks. The apparatus comprises a recording means for recording the copyright information by irradiating a laser beam onto the optical disk in such a manner as to repeatedly form, in a predetermined area of the optical disk, local regions which cause greater changes in the return-light receiving result as compared with the pits or marks. On the optical disk, the existence ratio of the local regions for recording the copyright information is set to be less than 0.3 in the circumferential direction of the disk. In a reproduction mode, the copyright information recorded like a bar code for example can be exactly reproduced with certainty.

An optical disc recording / reproduction apparatus for recording and / or reproducing a data by applying a beam from an optical head unit through a substrate onto / from a recording layer of the optical disc through, wherein the substrate of the optical disc is 0.3 mm or below; the optical head unit comprises: an objective lens for converging an incident beam and emitting the beam toward the optical disc; a forward lens for converging the beam introduced through the objective lens and applying the beam to the optical disc; a lens holder where the objective lens and the forward lens are fixed; and an actuator for driving the objective lens and the forward lens as a unitary block and controlling at least focusing, the objective lens and the forward lens having a total numerical aperture of 0.8 or above.

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.