摘要:
[Object] To enable stable void recording to be performed with lower power than in a case where a conventional void (hole) recording method is adopted. [Solving Means] Provided is an optical recording medium including a recording layer in which a plurality of boundary surfaces of resin layers are formed, and intervals of the boundary surfaces are set to be equal to or smaller than a focal depth of recording light. A recording sensitivity of hole marks is enhanced at the boundary surfaces of the resin layers. Therefore, by providing the recording layer in which the boundary surfaces are provided at intervals equal to or smaller than the focal depth of recording light as described above, that is, the recording layer is practically filled with the boundary surfaces, the hole mark recording sensitivity of the recording layer can be enhanced as a whole. Accordingly, it becomes possible to suppress laser power requisite for recording to be smaller than that of the conventional art and solve the problems of the conventional void recording method. As a result, realizability of a large-capacity recording medium as a bulk-type recording medium can be additionally enhanced.
摘要:
The present invention makes it possible to use an optical pickup in common with conventional optical disks. In a three-dimensional mark recording layer (111v) of a voluminal medium (100v), information is recorded by forming a three-dimensional record mark (RM) in the vicinity of the focus (Fb) of a blue light beam (Lb) according to the blue light beam (Lb) that is concentrated and has a light intensity equal to or larger than a predetermined intensity. The information is reproduced from the three-dimensional mark recording layer (111v) on the basis of a reproducing blue light beam (Lbr) deriving from irradiation of the blue light beam (Lb). A servo layer (114v) of the voluminal medium (100v) reflects at least part of the red light beam (Lr) which is irradiated in order to square the position of the blue light beam (Lb) in the three-dimensional mark recording layer (111v) with an arbitrary target mark position and whose wavelength is different from that of the blue light beam (Lb). The servo layer (114v) is separated by approximately 0.6 mm in the light-axis (Lx) direction of the red light beam (Lr) from the incident surface (100vA) to which the red light beam (Lr) is routed.
摘要:
The invention concerns an irreversible optical recording medium (1), comprising at least one active layer (4) having a rear surface (4b) and a front surface (4a) designed to receive at least one writing optical radiation (7). The writing optical radiation (7) enables, through a layer (3) forming a gas source arranged on the rear surface (4b) of the active layer, local formation, in said active layer (4) of gas bubbles forming writing marks. The layer (3) forming the gas source has, moreover, a thickness not more than 100 nm, so as to limit the height of the bubbles formed in the active layer (4) and hence so as to improve the monitoring of the track during reading operations. Preferably, the layer (3) forming the gas source is made of carbon-doped hydrogenated silicon oxide.
摘要:
An optical information recording medium includes a recording layer provided on a cured resin on which a recording mark is formed by the temperature rise around a focal point caused by absorbing a predetermined recording beam converged for recording of information according to the wavelength of the recording beam and from which the information is reproduced, when a predetermined reading beam is emitted for reproducing of the information, based on the optically-modulated reading beam, wherein the recording layer includes an activated recording area that has been activated as a result of being exposed to an activating beam whose light intensity is at a predetermined light intensity level.
摘要:
A substrate is deformed into a raised shape by irradiating an optical disc recording medium with a laser beam at a prescribed laser power. As the substrate is deformed into the raised shape, a reflecting film laminated on the substrate is also deformed into the raised shape, and a reproduction signal level equivalent to that of a land portion can be obtained at a pit portion by the embodiment of the raised deformation. A reproduction signal level equivalent to that of the pit portion can be obtained at the land. At this time, since the raised deformation embodiment can be controlled by the power of the laser beam applied, the pit can be made into land and the land can be made into pit by setting the laser power. Thus, recording data can be rewritten in the optical disc recording medium wherein data is recorded by the combination of the pits and lands formed on the substrate.
摘要:
A write-once optical disc which uses a short-wavelength laser (wavelength = 600 nm or less) allows BCA information recording even using a long-wavelength laser (wavelength falling within a range from 600 nm to 800 nm). To this end, a groove is cut in advance on a BCA part on a molded substrate of the optical disc to store a dye. In this way, the sensitivity of the dye in the BCA increases, to allow a laser having a wavelength (a wavelength falling within the range from 600 nm to 800 nm) other than the wavelength (e.g., 405 nm) corresponding to information recording of the dye to record a barcode pattern on the BCA.
摘要:
An optical recording disc capable of recording/reproducing data constituted of a recording mark array including recording marks and blank areas even when the length of the recording marks or the length of the blank area between adjacent recording marks is shorter than a resolution limit, capable of increasing the recording capacity greatly, and capable of enhancing C/N ratio of a reproduction signal. The optical recording disc comprises a substrate (2), a third dielectric layer (3), a light absorption layer (4), a second dielectric layer (5), a decomposition reactive layer (6) principally containing a platinum oxide, a first dielectric layer (7), and a light transmitting layer (8), characterized in that the second dielectric layer (5) has a thickness of 20-100 nm, the platinum oxide in the decomposition reactive layer (6) is decomposed into platinum and oxygen when the decomposition reactive layer (6) is irradiated with a laser beam (20) through the light transmitting layer (8), cavities are formed by oxygen gas thus produced, and a recording mark is formed on the decomposition reactive layer (6) by fine platinum particles deposited in the cavities.
摘要:
An optical recording medium is provided in which interlayer crosstalk is low and in which stable and high-quality recording characteristics can be obtained. To this end, an optical recording medium comprises a first recording part which includes a first recording layer and a first light reflecting layer and which is disposed on a side closer to a light receiving surface, and a second recording part which includes a second recording layer and a second light reflecting layer and which is disposed on a side farther from the light receiving surface, the first recording part and the second recording part being stacked, wherein the thickness (e.g., 60 to 150 nm) of the second light reflecting layer is larger than the thickness (e.g., 15 to 35 nm) of the first light reflecting layer.
摘要:
A recording mark train is formed in an optical recording medium including a noble metal oxide layer by decomposing a noble metal oxide and deforming the noble metal oxide layer. Noble metal particles are irreversibly deposit in the noble metal oxide layer formed with the recording mark train and a laser beam for reproducing data is irradiated onto the thus deposited noble metal particles, thereby reading the recording mark train. The recording mark train includes at least one recording mark having a length shorter than 0.37 lambda / NA wherein lambda is the wavelength of the laser beam and NA is an optical system for irradiating the laser beam. According to the present invention, in the case of recording and reproducing a recording mark having a size smaller than the resolution limit or a recording mark having a size equal to or larger than the resolution limit but close to the resolution limit in this manner, a high reproduction output can be obtained and a high reproduction durability can be achieved for each of the all recording marks in the recording mark train.