Abstract:
An optical information storage medium includes information on recording layers that have the same reproduction channel characteristics or different reproduction channel characteristics, and a recording/reproducing method for the optical information storage medium. Formal recording layer information is recorded in a reproduction-only zone, and effective recording layer information is recorded in a recordable zone of the area other than a user data area. The formal recording layer information is reproduced using a differential signal channel or a sum channel, and the effective recording layer information is reproduced using the sum channel. The optical information storage medium addresses the case that all of recording layers cannot satisfy the formal recording layer information due to errors occurring during the manufacture of a storage medium. Thus, the disc defective proportion can be reduced, and loss of user data due to application of inaccurate recording layer information can be prevented.
Abstract:
A recording apparatus to record a mark on a recording medium includes an aberration detecting part and an optical power controller. The aberration detecting part detects an aberration signal corresponding to the amount of an aberration contained in a light beam radiated onto a recording surface of the recording medium by using an optical pickup system which includes a light source and an objective lens. The light source emits a light beam having a power to record the mark on the recording medium. The objective lens condenses the light beam to focus the light beam as an optical spot on the recording surface of the recording medium. The optical power controller controls the power output from the light source according to the detected aberration signal, so as to have the light source output an optical power to record the mark, in which a deformation due to the aberration is compensated for, on the recording medium. Accordingly, even though the aberration occurs, a proper mark in which the deformation due to the aberration is compensated for can be recorded by increasing the recording power of the light source in proportion to the amount of the aberration to compensate for the aberration. As a result, the mark showing a good signal characteristic can be recorded on the recording medium without an additional aberration compensating device.
Abstract:
A high density optical disk including a multi-layer film having at least one recording layer and a light transmission layer deposited on a substrate, with information capable of being recorded/reproduced by a light beam input from an upper portion of the light transmission layer, where a composition of the recording layer is Gex-sby-Tez, and has a composition ratio of 3nullxnull8, 65nullynull80 and xnullynullznull100. Thus, the wavelength of a laser diode adopted in an pickup becomes shorter and, as the NA of an objective lens becomes high, each layer forming a multi-layer film has a range of the thickness and composition ratio to satisfy an optical feature suitable therefore.
Abstract translation:一种高密度光盘,包括具有至少一个记录层的多层膜和沉积在基板上的光透射层,具有能够通过从光透射层的上部输入的光束进行记录/再现的信息, 其中记录层的组成是Gex-sby-Tez,并且组成比为3 <= x <= 8,65 <= y <= 80,x + y + z = 100。 因此,拾取器中采用的激光二极管的波长变短,并且随着物镜的NA变高,形成多层膜的每个层的厚度和组成比的范围都满足因此适合的光学特征 。
Abstract:
A method of recording data on a compact disc is provided includes modulating the data of 1 byte to p-channel bits, recording the modulated data when a minimum mark length is greater than 0.5 nullm and smaller than 1.0 nullm, p/q is greater than 4.5 and smaller than 8 when the minimum mark length corresponds to q-channel bits, and a format efficiency is greater than 0.6 and smaller than 1.0. Thus, data can be recorded on an existing compact disc at a higher density.
Abstract:
A high-density information storage medium includes a center hole, a clamping area, and a data area for recording user data, wherein when a wavelength of light radiated to record and/or reproduce information is null, and when a numerical aperture of an objective lens to form a light spot of a predetermined size on a recording surface is NA, a ratio of nullnull/NAnull to a track pitch is 1.45 or less. The high-density information storage medium has favorable noise characteristics and a large serve margin while having a desired amount of a storage capacity.
Abstract:
A compact high-density optical disc capable of securing recording/reproducing characteristics and high-density recording capacity. The high-density optical disc has a whole diameter of 80 mm or less to 28 mm, a whole thickness in a range of 0.3-0.7 mm, and a position where data starts being recorded in a range of 27-45 mm of the diameter. Thus, an existing disc drive can be used, the size of the high-density optical disc can be reduced, and high-density recording capacity can be secured.
Abstract:
An optical recording medium on which a header signal having multi-modulated header information is recorded, an apparatus and method of recording the header signal, and an apparatus and method of reproducing header information from the header signal of the optical recording medium which includes a wobbled track on which user data is recorded, and a header area in which a header signal having multi-modulated header information is recorded. Accordingly, the optical recording medium increases the recording density of header information, thereby providing a wider user data area.
Abstract:
A high-density optical recording medium and method of recording data on the optical recording medium. The optical recording medium includes a plurality of data recording/reproducing surfaces having reflectances for light passing through a pit area, a land/groove area, and a land/groove area on which data are recorded, of a data recording/reproducing surface included between a light source for emitting light and a recording/reproducing surface selected from the plurality of data recording/reproducing surfaces, the reflectances satisfy the expressions r1nullr2nullr3 and null(r1-r3)/r3nullnull0.2, where r1, r2 and r3 are the reflectances of the pit area, the land/groove area and the land groove area on which data are recorded, respectively.
Abstract:
A cartridge for an information recording medium includes a cartridge case, an opening cover, detachably mounted to a rear side opening of the cartridge case, for enabling the information recording medium to be withdrawn or inserted with respect to the cartridge case, and a holding unit for preventing movement of the information recording medium by supporting the information recording medium when the information recording medium is received and/or withdrawn into/from the cartridge case. The holding unit includes a pair of elastic pressure parts, elastically formed on the opening cover, for elastically supporting the information recording medium to prevent movement of the information recording medium when the opening cover is not attached to the cartridge case, and a release unit for releasing the pair of elastic pressure parts when the opening cover is attached to the cartridge case so that the information recording medium is rotatable in the cartridge case.
Abstract:
A method of and apparatus for recording data on an optical recording medium form a mark or a space by using a recording waveform having an erase pattern containing a multi-pulse. The method and the apparatus prevent distortion of the mark or the space and improve a mark shape such that a recording/reproducing characteristic of the optical recording medium is improved.