摘要:
Provided is a technique for reproducing information recorded on a holographic recording medium including a reflecting layer and a recording layer. When reproducing, a reproducing reference light is focused on a reflecting surface of the reflecting layer to produce a phase conjugate reproduced light and an ordinary reproduced light, and the phase conjugate reproduced light and the ordinary reproduced light are guided to a sensing surface of an image sensor to produce on the sensing surface a first reproduced image and a second reproduced image smaller than the first reproduced image, respectively. An intensity of the ordinary reproduced light on the sensing surface is higher than an intensity of the phase conjugate reproduced light on the sensing surface. An output of the image sensor corresponding to a non-overlapping portion of the first reproduced image which does not overlap the second reproduced image is utilized for reproducing the information.
摘要:
An optical recording medium has a recording layer recording information as hologram by receiving a beam of light corresponding to the information. The recording layer includes a plurality of recording areas which are physically separated in a direction, the direction is substantially parallel to a surface that the beam of light enters and a boundary area provided between the recording areas to separate the respective recording areas.
摘要:
A phase-change optical recording medium has a first information layer including a phase-change optical recording film arranged in a position close to the light incident side, a second information layer including another phase-change optical-recording film arranged in a position remote from the light incident side and an interlayer separating film arranged between the first information layer and the second information layer, in which at least one of the first information layer and the second information layer includes a noise reduction film in contact with the interlayer separating film. The noise reduction film is formed of SiOx (1≦x≦2) or SiOC.
摘要翻译:相变光记录介质具有包括布置在靠近光入射侧的相变光记录膜的第一信息层,第二信息层,包括布置在远离光入射侧的位置的另一相变光记录膜 光入射侧和布置在第一信息层和第二信息层之间的层间隔离膜,其中第一信息层和第二信息层中的至少一个包括与层间隔离膜接触的降噪膜。 降噪膜由SiOx(1 <= x <= 2)或SiOC形成。
摘要:
There is provided an optical recording medium capable of preventing cross erase and increasing its recording density. The optical recording medium includes: a reflecting film; a first transparent film provided on the reflecting film; a first semitransparent film provided on the first transparent film; a second transparent film provided on the first semitransparent film; a recording film provided on the second transparent film, the recording film being capable of reversibly changing an atomic arrangement; and a third transparent film provided on the recording film. The first semitransparent film has a complex refractive index of n−k satisfying relationships of 0
摘要:
A magnetic recording medium comprising a magnetic recording layer formed on a substrate, in which information is recorded by forming recording cells in recording tracks formed on a surface of the magnetic recording layer, wherein the magnetic recording layer has a structure that magnetic particles are formed in a non-magnetic matrix and ordered particle domains in which magnetic particles are arrayed regularly are formed on a surface thereof, and wherein a size in a track width direction of each ordered particle domain is one fifth or more of a width of the recording track formed on the recording layer.
摘要:
A multilevel phase change optical recording medium comprises first to N-th (N≧2) phase change optical recording layers, wherein an i-th recording layer and a j-th recording layer, which are two recording layers arbitrarily selected from the first to N-th recording layers, meet the conditions of Ti>Tmi and &tgr;wi &tgr;xj, with respect to a particular recording laser beam selected from recording laser beams having different power levels, where T is the maximum temperature of the recording layer in a recording operation, Tm is the melting point of the recording layer, Tx is the crystallizing temperature of the recording layer, &tgr;w is a time required for the recording layer to be cooled down from Tm to Tx after the laser beam irradiation, and &tgr;x is the crystallizing time of the recording layer.
摘要:
Laser light used to make crystal space portions on a recording layer is divided into, and irradiated in, at least two kinds of steps. Thus, the recording layer can be maintained in a temperature zone increasing the crystal nuclei generating frequency and in a temperature zone increasing the crystal growth rate with a good balance between these temperature zones. Therefore, it is possible to remove “fail-to-erase” portions upon making crystal space portions by promotion of crystallization and to improve the overwrite erasability. It is especially effective in a mode for recording on a recording medium in a non-initialized status, i.e., in a mode for recording crystal spaces on an as-depo amorphous-state medium.
摘要:
A phase change recording medium comprises a substrate, an interference layer formed on the substrate and a recording layer formed on the interference layer. In this, the reflectance of the crystalline region in the recording layer is lower than that of amorphous region therein, and the interference layer comprises at least three layers of which the dielectric constant differs from that of the adjacent layers. With that constitution, the optical characteristics and the thermal characteristics of the medium are all optimized.
摘要:
A magnetic element comprises a granular magnetic film which has ferromagnetic fine particles dispersed in a dielectric matrix and does not display superparamagnetism and further possesses a finite coercive force, and a ferromagnetic film. A granular magnetic film and a ferromagnetic film are stacked or arrayed along one surface of a substrate and constitutes a ferromagnetic tunnel junction film. In the ferromagnetic tunnel junction film, the granular magnetic film functions as a barrier. Of the granular magnetic film and the ferromagnetic film, by varying spin direction of one ferromagnetic film through an external magnetic field, a giant magnetoresistance effect is manifested. Such a magnetic element is characterized in that magnetoresistance change rate is large, saturation magnetic field is small, resistance of the element can be controlled to an appropriate value, performance is small in its variation and stable.
摘要:
A phase change optical recording medium includes a phase change optical recording layer which transits between two states of the crystalline state and the amorphous state when irradiated with light, and a heat adjustment layer which is formed adjacent to the phase change optical recording layer and abruptly increases or decreases thermal conductivity with increasing temperature upon irradiation of recording light. This phase change optical recording medium can decrease the size of the recording mark and makes high-density recording possible.