摘要:
An optical recording medium has a mask layer 4, an intermediate dielectric layer 5, a recording layer 6, and a reflective layer 8 on a transparent substrate 2. The recording layer 6 contains a recording material which changes its crystallographic structure upon exposure to recording light for recording information. The mask layer 4 contains a mask material which increases its light transmittance when melted and has a complex refractive index (n.sub.0 -ik.sub.0), of which the real part n.sub.0 drops by 1.0 or less and the imaginary part k.sub.0 drops by 0.25-1.0 when the mask material converts from a crystalline state to an amorphous or microcrystalline state. Signals can be reproduced from the medium with high C/N without resorting to reading light of shorter wavelength or an optical pickup objective lens having a larger numerical aperture and even when the linear velocity of the medium relative to recording and reproducing light is low.
摘要:
In a phase change type of optical recording medium including on a substrate a lower dielectric layer, a recording layer, a first upper dielectric layer contiguous to said recording layer, a second upper dielectric layer and a reflective layer, the recording layer comprises a recording material containing an element A that represents silver and/or gold, an element B that represents antimony and/or bismuth, an element C that represents tellurium and/or selenium, an element indium, and an element M that represents at least one element selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, manganese, tungsten and molybdenum, with the atomic ratio of the elements in said recording material having the following formula:{(A.sub.a B.sub.b C.sub.1-a-b).sub.x (In.sub.0.5 C.sub.0.5).sub.y B.sub.1-x-y }.sub.1-z M.sub.zwherein 0.10.ltoreq.a.ltoreq.0.40, 0.10.ltoreq.b.ltoreq.0.40, 0.20.ltoreq.x.ltoreq.0.80, 0.01.ltoreq.y.ltoreq.0.60, and 0.001.ltoreq.z.ltoreq.0.20. The first upper dielectric layer contains at least one compound selected from the group consisting of aluminum nitride, silicone nitride and aluminum oxide. The second upper dielectric layer is made up of a material that has a thermal conductivity lower than that of said first upper dielectric layer.
摘要:
A phase change type optical recording medium has a recording layer of a recording material containing elements A, B, and C wherein A is Ag and/or Au, B is Sb and/or Bi, and C is Te and/or Se. Information is recorded by directing a light beam to the recording layer to form recorded marks therein such that the recorded marks are amorphous or microcrystalline while an unrecorded portion of the recording layer remains crystalline, and the A concentration of the unrecorded portion is at least 0.5 atom % higher than the A concentration of the recorded marks. C/N and modulation factor are improved and such improvements are kept even after hot humid storage.
摘要翻译:相变型光学记录介质具有记录材料的记录层,其中A,B和C元素A,B和C中的A是Ag和/或Au,B是Sb和/或Bi,C是Te和/或Se。 通过将光束引导到记录层以在其中形成记录标记来记录信息,使得记录的标记是非晶或微晶的,而记录层的未记录部分保持结晶,并且未记录部分的A浓度为至少0.5原子 高于记录标记的A浓度%。 C / N和调制因子得到改善,即使在潮湿潮湿储存之后也能保持这样的改善。
摘要:
An optical recording medium includes a recording layer which contains as major components an element (A) selected from Ag, Au, Cu and Pt, an element (B) selected from Ti, Zr, Hf, V, Nb, Ta, Mn, W and Mo, and an element (C) selected from Te, Se and S. The medium features high performance and versatile use.
摘要:
In an optical recording medium comprising a recording layer on a substrate, the recording layer contains a recording material which consists essentially of A, B, C, MI, and MII wherein A is Ag and/or Au, B is In, C is Te and/or Se, MI is Sb and/or Bi, and MII is at least one element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mn, W and Mo, the atomic ratio of the respective elements being represented by the formula:[(A.sub.a B.sub.b C.sub.1-a-b).sub.x MI.sub.1-x ].sub.1-y MII.sub.ywherein 0.01.ltoreq.a
摘要:
An optical recording medium is prepared by forming on a substrate a phase change recording layer comprising elements A, B, C and optional D wherein A is silver and/or gold, B is antimony and/or bismuth, C is tellurium and/or selenium, D is indium or a mixture of indium and aluminum and/or phosphorus. Formation of the recording layer is carried out by the step of sputtering an A--C base metal and the step of sputtering a B base metal optionally containing D in this successive order or reverse order; or by the step of sputtering an A--C base metal, the step of sputtering a B base metal, and the step of sputtering a D base metal in this successive order or reverse order. Since the resulting recording layer is already crystallized, the method eliminates a need for extra initialization.
摘要:
An optical recording medium comprising a phase change recording layer and a dielectric layer on a substrate is improved in reliability during storage at elevated temperature when the recording layer has a composition of the following formula.[{(Ag,Au).sub.a (Sb,Bi).sub.b (Te,Se).sub.c }.sub.1-d (In,Al,P).sub.d ].sub.1-e M.sub.eLetters a to e are: 0
摘要:
An optical information medium has on a substrate (2) with information-carrying pits (21), a light transmittance control layer (3) including a lower dielectric layer (31), a mask layer (32) and an upper dielectric layer (33). The mask layer has an original state before irradiation of reading light. Upon irradiation of a reading light beam to define a beam spot, the mask layer undergoes a crystal-to-crystal transition in a region (H) of the beam spot depending on the intensity distribution of the beam spot. Multiple reflection condition changes in the transition portion so that the beam spot contributing to read-out is limited to the transition or transition-free region (H or L). The transition temperature is in the range of 200.degree. to 450.degree. C. The mask layer returns to the original state after passage of the beam spot. The invention is also applicable to an optical recording medium having a recording layer above or below the transmittance control layer.
摘要:
An optical recording medium includes on the surface of a substrate a recording thin film, a thin film of dielectric material and a reflecting thin film in this order, characterized in that said recording thin film contains Ag, M and O or Fe, M and N, wherein M is at least one member selected from the group consisting of Ni, Ti, Co and Cu. The optical recording medium further includes between the substrate and the recording thin film and on the substrate a surface layer having a glass transition point lower than that of the substrate.
摘要:
A current sensor includes first to fourth magneto-resistive elements each having a resistance value; and a compensation current line applying a compensation magnetic field to the magneto-resistive elements. A bridge circuit is formed by the magneto-resistive elements. Resistance values of the first and third magneto-resistive elements change together in one increasing/decreasing direction. Resistance values of the second and fourth magneto-resistive elements change together in the other increasing/decreasing direction. The compensation current is generated by a potential difference between the first and second junctions in response to application of voltage between the third and fourth junctions. The compensation current line includes first to fourth line portions. Each line portion extends in the same direction as the extending direction of the magneto-resistive elements, overlaps the corresponding magneto-resistive elements, and. The current-to-be-detected is detected based on the compensation current.