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: The invention relates to an Ag-based alloy sputtering target including at least one element selected from the group consisting of Ti, V, W, Nb, Zr, Ta, Cr, Mo, Mn, Fe, Co, Ni, Cu, Al, and Si in a total amount of 1 to 15% by weight, in which the Ag-based alloy sputtering target has an arithmetic mean roughness (Ra) of 2 ?m or more and a maximum height (Rz) of 20 ?m or more at a sputtering surface thereof.

Abstract: The present invention provides an Ag-based alloy reflective film or semi-transmissive reflective film of an optical information recording medium having high reflectivity and excellent in the wet heat resistance and the light fastness. The invention relates to a reflective film or a semi-transmissive reflective film of an optical information recording medium comprising an Ag-based alloy comprising Hf in an amount of 0.05 to 0.8 atomic %.

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: An optical information recording medium of the present invention is a read-only optical information recording medium in which at least one reflective film formed of an Al-based alloy and at least one light transmission layer are successively laminated on a substrate. The arithmetical mean roughness of the reflective film is 0.5 nm or less, and the thickness of the reflective film is 25 nm or more. The optical information recording medium of the present invention is the read-only optical information recording medium including the reflective film which has a high reflectivity and low jitter, preferably has excellent durability, and is used particularly appropriately in an optical disc using a blue laser such as BD-ROM or HD DVD-ROM.

Abstract: Disclosed are optical information recording layers to create recording marks upon irradiation with a laser beam, in which the recording layers are composed of: an indium alloy containing 0.1 to 15 atomic percent of one or more rare-earth elements; an indium alloy containing 0.1 to 50 atomic percent of one element selected from the group consisting of palladium (Pd), cobalt (Co), platinum (Pt), and vanadium (V); an indium alloy containing 6 to 50 atomic percent of nickel (Ni); or an indium alloy containing 0.1 or more and less than 50 atomic percent of gold (Au). Also disclosed are information storage media provided with the recording layers, and sputtering targets for the deposition of the recording layers, which have the alloy compositions.

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: A silver alloy reflective film is used in an optical information recording medium and contains silver as a main component, a total of 0.01 to 3 atomic percent of at least one of Bi and Sb, and a total of 3 to 42 atomic percent of at least one of Cu, Ge, Mg, and Zn. The silver alloy reflective film preferably further contains 0.1 to 3 atomic percent of yttrium. An optical information recording medium includes the silver alloy reflective film. A sputtering target for depositing the silver alloy reflective film contains silver as a main component, 0.01 to 3 atomic percent of Sb (or 0.03 to 10 atomic percent of Bi), and a total of 3 to 42 atomic percent of at least one of Cu, Ge, Mg, and Zn.

Abstract: There is provided a read-only optical information recording medium including a reflective film which has high reflectivity, and is superior in environment resistance at the time of being kept in a high-temperature, high humidity environment as well as light resistance at the time of being kept in a high-intensity light irradiation environment and repeating reproduction durability against a repeating reproduction test. In a read-only optical information recording medium in which at least one reflective film and at least one light transmissive layer are laminated in order on a substrate, the reflective film is made of a Ag-base alloy including 0.01 to 1.0 at % of Bi and 0.1 to 13.0 at % of Cu.

Abstract: A silver alloy reflective film is used in an optical information recording medium and contains Ag as a main component, a total of 1 to 10 atomic percent of at least one selected from Nd, Gd, Y, Sm, La, and Ce, and a total of 2 to 10 atomic percent of at least one selected from Li, Mg, Al, Zn, Cu, Pt, Au, Pd, Ru, and Rh. The reflective film preferably further contains 0.01 to 3 atomic percent of at least one of Bi and Sb and/or 2 to 10 atomic percent of at least one selected from In, Sn, and Pb. An optical information recording medium includes the silver alloy reflective film. A silver alloy sputtering target has the same composition as the silver alloy reflective film.

Abstract: A silver alloy reflective film is used in an optical information recording medium and contains silver as a main component, a total of 1 to 10 atomic percent of at least one rare-earth element, and a total of 1 to 15 atomic percent of at least one selected from In, Sn, Al, and Mg, in which the total content of the at least one rare-earth element and the at least one selected from In, Sn, Al, and Mg is 5 atomic percent or more. The silver alloy reflective film preferably further contains 0.01 to 3 atomic percent of at least one of Bi and Sb. A silver alloy sputtering target has the same composition as the silver alloy reflective film.

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: 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: A silver alloy reflective film contains X1 as a component and has an enriched layer located in a region within 2 nm deep from the surface of the reflective film, in which the component X1 is enriched in the enriched layer at a higher concentration than the average concentration of X1 in the whole of the reflective film, wherein X1 is at least one alloying element selected from the group consisting of Bi, Si, Ge, Pb, Zn, Cd, Hg, Al, Ga, In, Tl, Sn, As, and Sb. The reflective film has stable and excellent basic properties as reflective films, such as initial reflectivity and durability, and satisfies further requirements, such as laser marking suitability. An optical information recording medium includes the reflective film and is excellent.

Abstract: A silver alloy reflective film is used in an optical information recording medium and contains silver as a main component, a total of 0.01 to 3 atomic percent of at least one of Bi and Sb, and a total of 3 to 42 atomic percent of at least one of Cu, Ge, Mg, and Zn. The silver alloy reflective film preferably further contains 0.1 to 3 atomic percent of yttrium. An optical information recording medium includes the silver alloy reflective film. A sputtering target for depositing the silver alloy reflective film contains silver as a main component, 0.01 to 3 atomic percent of Sb (or 0.03 to 10 atomic percent of Bi), and a total of 3 to 42 atomic percent of at least one of Cu, Ge, Mg, and Zn.

Abstract: The invention relates to an Ag-based alloy sputtering target including at least one element selected from the group consisting of Ti, V, W, Nb, Zr, Ta, Cr, Mo, Mn, Fe, Co, Ni, Cu, Al, and Si in a total amount of 1 to 15% by weight, in which the Ag-based alloy sputtering target has an arithmetic mean roughness (Ra) of 2 ?m or more and a maximum height (Rz) of 20 ?m or more at a sputtering surface thereof.

Abstract: A sputtering target made of an Ag base alloy containing 0.6 to 10.5 atomic % Ta and 2 to 13 atomic % Cu, is characterized in that: when the sputtering surface of the sputtering target is image-analyzed, (1) the ratio of the total area of Ta particles having a circle equivalent diameter of from 10 ?m or more to 50 ?m or less, to the total area of all Ta particles, is 60% or more, and the average distance between the centers of gravity of Ta particles is from 10 ?m or more to 50 ?m or less; and (2) the ratio of the total area of Cu particles having a circle equivalent diameter of from 10 ?m or more to 50 ?m or less, to the total area of all Cu particles, is 70% or more, and the average distance between the centers of gravity is from 60 ?m or more to 120 ?m or less.

Abstract: Provided is a recording layer for optical information storage media, which not only excels in initial reflectivity and creativity of recording marks, but also extremely excels in durability under high temperature and high humidity conditions, and which can be adequately applied to next-generation optical discs using blue-violet laser. The recording layer for optical information storage media is a recording layer to create recording marks upon irradiation with a laser beam. This recording layer is composed of a tin-based alloy containing a total of 1.0 atomic percent or more and 15 atomic percent or less of at least one selected from neodymium (Nd), gadolinium (Gd), and lanthanum (La).

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 silver alloy reflective film is used in an optical information recording medium and contains silver as a main component, a total of 0.01 to 3 atomic percent of at least one of Bi and Sb, and a total of 3 to 42 atomic percent of at least one of Cu, Ge, Mg, and Zn. The silver alloy reflective film preferably further contains 0.1 to 3 atomic percent of yttrium. An optical information recording medium includes the silver alloy reflective film. A sputtering target for depositing the silver alloy reflective film contains silver as a main component, 0.01 to 3 atomic percent of Sb (or 0.03 to 10 atomic percent of Bi), and a total of 3 to 42 atomic percent of at least one of Cu, Ge, Mg, and Zn.