Abstract: An optical disk read only memory having an information recording surface with a concave-convex pattern formed on the basis of a first signal and a reflective film covering the surface. The disc medium includes: an additional information recording section formed on a recording track of a first data string; and a second data string including a mark of removing or reducing the reflective film. The modulation methods of the first and the second data strings are identical, and Lh(n)>Lp1(n) and Wh(n)>(Wp1(n)+Wp2(n))/2 are satisfied, where a reference clock cycle is T, a data length is nT, a length and a width of the mark are Lh(n) and Wh(n), a length and a width of a base of the pit are Lp1(n), and Wp1(n), a length and a width of a top face of the pit is Lp2(n) exceeding Lp1(n), and Wp2(n) exceeding Wp1(n).

Abstract: An optical information recording medium includes a read-only information recording portion, and a BCA (Burst Cutting Area) portion formed by laser marking. A reflective film on an information recording surface of the read-only information recording portion and a reflective film on the BCA portion are formed of the same material. The reflective film includes Ag as a main component, and at least one of Nd and Gd, and at least one of Sn and In as components; the reflective film including at least one of Nd and Gd of 0.1 atom % or more and 3.0 atom % or less in total and at least one of Sn and In of 3 atom % or more and 12 atom % or less in total. Recorded information is reproduced from the information recording surface of the read-only information recording portion and a BCA signal is reproduced from the BCA portion, using blue-violet laser reproducing light.

Abstract: The invention relates to an Ag alloy reflective film for an optical information recording medium, including Ag as a main component, at least one kind of Nd, Gd, Y and Sm in a total amount of more than 0.1 atomic percent and not more than 3.0 atomic percent and at least one kind of W, Mo, V, Zr, Nb and Cr in a total amount of 3.0 to 10.0 atomic percent; an Ag alloy reflective film for an optical information recording medium, including Ag as a main component, at least one kind of Nd, Gd, Y and Sm in a total amount of more than 0.1 atomic percent and not more than 3.0 atomic percent and at least one kind of Ti and Ta in a total amount of 5.0 to 10.0 atomic percent; an optical information recording medium including the Ag alloy reflective film; and an Ag alloy sputtering target having a composition same as that of the Ag alloy reflective film.

Abstract: Auxiliary digital data is sold and bought. A process for selling auxiliary digital data is performed with respect to a process for cancelling a limitation of use of the digital data. A process for buying the auxiliary digital data is performed. A process for receiving a selling request and a buying request is performed, and selling and buying transactions are concluded. The process of selling, the process of buying, and the process of selling and buying are each performed by transmitting and receiving data through a communication network.

Abstract: An information signal area on an information signal recording surface is provided as pits on a mirror in accordance with modulated information data, and is covered with a metal alloy reflective film. Sections that do not include pits corresponding to the information data are provided in the information signal area, and portions of the metal alloy reflective film on the sections are formed as perforated marks corresponding to the information data. In this case, the reproduction signal amplification level of a prepit signal and the reproduction signal amplitude level of a perforated mark signal can be obtained as substantially equal values by adjusting the depth and width of pits and/or adjusting the width and length of perforated marks. Hence, waveform distortion due to a waveform equalization circuit and variations in binary signals due to displacement of the slice level are reduced so that signals can be stably and reliably detected with the same reading apparatus.

Abstract: The invention provides an optical information recording medium which is compatible with Blu-ray for recording a BCA signal by laser marking, in which the optical information recording medium has superior reading properties and is improved in recording properties and reliability in a BCA portion. A reflective film 7 includes Ag as a main component, and Nd, Gd, and Bi, in which Nd, Gd and Bi are effective for long-tem storage stability and inhibition of corrosion, and an addition of a small amount of Gd is effective for enhancing absorption of laser marking light. Accordingly, the invention can provide a highly-reliable optical information recording medium that exhibits a superior reading property of an information recording portion and a BCA portion, and that simultaneously exhibits a superior recording property of the BCA portion by selection of the composition at recording a BCA signal by laser marking.

Abstract: An optical-disc manufacturing method including the steps of: fabricating a pre-exposure disc master by forming, on a substrate, a heat accumulation layer having a thickness of 17% or less of a recording-laser wavelength and forming an inorganic resist layer; performing exposure of a recording-signal pattern having pits and spaces with respect to the inorganic resist layer of the disc master, by performing recording-laser light irradiation; fabricating a disc master having a pit-array shape having pits and spaces, by performing development processing after the exposure; manufacturing a stamper to which the pit-array shape is transferred, by using the disc master having the pit-array shape; and manufacturing an optical disc having a predetermined layer structure including a recording layer to which the pit-array shape of the stamper is transferred and in which a silver or silver-alloy reflective film is formed on the pit-array shape.

Abstract: A pirated optical recording medium may be determined which is produced by physically transferring a shape of pits and lands formed on a substrate of an optical recording medium. The optical recording medium is provided with excellent weatherability and long-term storage reliability. A reflective film formed of an Ag alloy film of Ag100-x-yXxCuy, where X is at least one element among Ti, W, Ta, V, Mo, Nb and Zr, is formed on a substrate on which main data is recorded with a combination of pits and lands. A mark may be formed so that a reproduction signal level in the recorded mark of auxiliary data write once recorded on the reflective film is increased, and a reproduction signal level is decreased in an optical recording medium prepared by physically transferring the surface shape of the pits and lands of the substrate. A pirated optical recording medium may be determined in this manner.

Abstract: An optical disk read only memory having an information recording surface with a concave-convex pattern formed on the basis of a first signal and a reflective film covering the surface. The disc medium includes: an additional information recording section formed on a recording track of a first data string; and a second data string including a mark of removing or reducing the reflective film. The modulation methods of the first and the second data strings are identical, and Lh(n)>Lp1(n) and Wh(n)>(Wp1(n)+Wp2(n))/2 are satisfied, where a reference clock cycle is T, a data length is nT, a length and a width of the mark are Lh(n) and Wh(n), a length and a width of a base of the pit are Lp1(n), and Wp1(n), a length and a width of a top face of the pit is Lp2(n) exceeding Lp1(n), and Wp2(n) exceeding Wp1(n).

Abstract: In a manufacturing method of a magneto-optical recording medium formed by laminating a plurality of magnetic layers, there is provided a manufacturing method whereby at least two of the magnetic layers can be properly and individually formed by sputtering the same target means in the same vacuum vessel under different conditions at the time of a sputtering process in accordance with an element composition ratio and/or magnetic characteristics of each layer.

Abstract: At the stage where disc substrates are to be manufactured in mass production by using a stamper, a section where pits/lands are not formed is formed in advance as an additional information recording section among recording tracks formed by a recording data sequence of pits/lands. A metal alloy reflection film is coated on the information recording surface including such an additional information recording section 10. Then, thereafter, additional information is recorded in the additional information recording section 10 by forming hole marks 6 by erasing or decreasing a partial area of the metal alloy reflection film. The additional information is recorded in a partial area of recording tracks in the information recording area (the area where information is recorded by a recording data sequence of pits/lands, the area including a content area and a management area such as a lead-in).

Abstract: An optical information recording medium includes a read-only information recording portion, and a BCA (Burst Cutting Area) portion formed by laser marking. A reflective film on an information recording surface of the read-only information recording portion and a reflective film on the BCA portion are formed of the same material. The reflective film includes Ag as a main component, and at least one of Nd and Gd, and at least one of Sn and In as components; the reflective film including at least one of Nd and Gd of 0.1 atom % or more and 3.0 atom % or less in total and at least one of Sn and In of 3 atom % or more and 12 atom % or less in total. Recorded information is reproduced from the information recording surface of the read-only information recording portion and a BCA signal is reproduced from the BCA portion, using blue-violet laser reproducing light.

Abstract: A method for manufacturing a magneto-optical recording medium in which reading of recorded information is performed through domain wall displacement in a reproduction layer is provided, in which magnetic separation of groove side-wall portions is performed more reliably; as a result a magneto-optical recording medium with satisfactory recording and reproduction characteristics can be provided.

Abstract: A method for manufacturing a magneto-optical recording medium in which reading of recorded information is performed through domain wall displacement in a reproduction layer is provided, in which magnetic separation of groove side-wall portions is performed more reliably; as a result a magneto-optical recording medium with satisfactory recording and reproduction characteristics can be provided.

Abstract: Auxiliary digital data is sold and bought. A process for selling auxiliary digital data is performed with respect to a process for cancelling a limitation of use of the digital data. A process for buying the auxiliary digital data is performed. A process for receiving a selling request and a buying request is performed, and selling and buying transactions are concluded. The process of selling, the process of buying, and the process of selling and buying are each performed by transmitting and receiving data through a communication network.

Abstract: In a manufacturing method of a magneto-optical recording medium formed by laminating a plurality of magnetic layers, there is provided a manufacturing method whereby at least two of the magnetic layers can be properly and individually formed by sputtering the same target means in the same vacuum vessel under different conditions at the time of a sputtering process in accordance with an element composition ratio and/or magnetic characteristics of each layer.

Abstract: The invention relates to an Ag alloy reflective film for an optical information recording medium, including Ag as a main component, at least one kind of Nd, Gd, Y and Sm in a total amount of more than 0.1 atomic percent and not more than 3.0 atomic percent and at least one kind of W, Mo, V, Zr, Nb and Cr in a total amount of 3.0 to 10.0 atomic percent; an Ag alloy reflective film for an optical information recording medium, including Ag as a main component, at least one kind of Nd, Gd, Y and Sm in a total amount of more than 0.1 atomic percent and not more than 3.0 atomic percent and at least one kind of Ti and Ta in a total amount of 5.0 to 10.0 atomic percent; an optical information recording medium including the Ag alloy reflective film; and an Ag alloy sputtering target having a composition same as that of the Ag alloy reflective film.

Abstract: An optical recording medium is provided. The optical recording medium includes at least a reflective film and a cover layer on a substrate; main data by a combination of pit and land are recorded on the substrate; a write-once recording is made to be possible on the reflective film by irradiating a laser light; sub-data are recorded by a mark that is formed by the irradiation of laser light for the write-once recording with respect to the reflective film; a reproducing signal level at portion where said mark is formed increases for the land of specified length; the mark by which the reproduced level decreases at the portion where the mark is formed is formed for an optical disc recording medium manufactured by physical copy; the reflective film is composed of an Ag-alloy film of Ag100?xXx(0<x<100); and the X is selected from Ti, W, Ta, V, Mo, Nb and Zr.

Abstract: A laser beam from an LD 11 is irradiated onto a magnetooptic disk 33 by a predetermined power for a heat treatment. After the heat treatment, the laser beam of a power smaller than the power upon heat treatment is irradiated to the heat-treated area. Reflection light of the laser beam of the small power enters photodetectors 24 and 26 and reflection light amounts of a P wave and an S wave are detected, respectively. A differential detecting circuit 27 detects a level of a magnetooptic signal corresponding to the heat-treated area on the basis of the reflection light amounts of the P wave and the S wave. A controller 28 determines whether or not the magnetooptic signal level detected by the differential detecting circuit 28 lies within a permissible range. If it is out of the range, the power of the laser beam to execute the heat treatment is adjusted and the process of a magnetooptic disk is stopped or a message showing such a fact is displayed, or the like.

Abstract: An optical recording medium in which deposition of impurities or damage to a surface of the medium illuminated by the light for signal recording and/or reproduction is to be prevented from occurring. An amine salt compound of perfluoropolyether having terminal carboxylic groups, represented by the chemical formulas (1) and/or (2): Rf—COO?N+HR1R2R3??(formula 1) R1R2R3N+H?CO—Rf—COO?N+HR1R2R3??(formula 2) where Rf denotes a perfluoropolyether group and R1, R2 and R3 denote hydrogen or a hydrocarbon group, is held on the surface side illuminated by light.