Protective Layer Patents (Class 428/64.6)
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Patent number: 8075974Abstract: An optical recording medium having first protective layer, recording layer, second protective layer, and reflective layer, wherein the recording layer contains a phase-change material represented by Formula (1?1), Formula (1-2), or Formula (1-3); the second protective layer contains one selected from zinc oxides, indium oxides, tin oxides, mixtures thereof, and materials Formula (2), and materials Formula (3). Formula (1?1): In?iSb?iX1?i(X1: Ge, Te, Zn, Mn, or mixture thereof, 0.10??1?0.25, 0.65??1?0.80, and 0.04??1?0.15) Formula (1-2): Ga?2Sb?2SnY2Ges2X2?2 (X2: Te, Zn, Mn, In, or mixture thereof, 0.04??2?0.09, 0.56?62?0.79, 0.05??2<0.30, 0.03??2?0.19, and 0??2?0.09) Formula (1-3): Mn?3Sb?3SnY3Ge?3X3?3 (X3: Te, In, Zn, Bi, or mixture thereof, 0.04??3?0.09, 0.56?63?0.79, 0.05??3?0.29, 0.03??3?0.23, and 0??3?0.09) Formula (2): ZnO—Al—Y [(100??4?64):?4:?4] (Y: Mn, Ge, Ti, or mixture thereof, 0.5??4?10.0, and 0?B4?25.Type: GrantFiled: March 2, 2007Date of Patent: December 13, 2011Assignee: Ricoh Company, Ltd.Inventors: Hiroshi Deguchi, Eiko Hibino, Hiroko Ohkura, Kazunori Ito, Hajime Yuzurihara, Hiroyuki Iwasa
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Patent number: 8034426Abstract: A two-layered optical recording medium which includes a first substrate, a first information layer, a second information layer, and a second substrate formed in this order as viewed from the light beam irradiation side, the first information layer includes a first lower dielectric layer, a first recording layer, a first upper dielectric layer, a first reflective layer, and an inorganic dielectric layer formed in this order as viewed from the light beam irradiation side; the second information layer includes a second lower dielectric layer, a second recording layer, a second upper dielectric layer, and a second reflective layer formed in this order as viewed from the light beam irradiation side; and the first reflective layer is made of Cu with a content of 99.8% by mass to 95.0% by mass and one or more metals selected from Ta, Nb, Zr, Ni, Cr, Ge, Au, and Mo.Type: GrantFiled: March 16, 2006Date of Patent: October 11, 2011Assignee: Ricoh Company, Ltd.Inventors: Masaru Shinkai, Michiaki Shinotsuka, Hiroyoshi Sekiguchi, Masaki Kato
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Patent number: 8012559Abstract: An optical information recording medium having the same recording volume as that of DVD-ROM is obtained which shows excellent characteristics at recording linear velocities within a range of twice linear velocity of DVD (about 8.2 m/s) to five times liner velocity of DVD (about 20.5 m/s) and excellent archival stability, by a construction including a transparent substrate, a recording layer which is formed on the substrate directly or with another layer interposed therebetween and can change in phase reversibly by a laser beam irradiation, wherein the composition of the recording layer is within a region bounded by composition points A(41.2, 7.4, 51.4), B(39.8, 10.5, 49.7), C(28.5, 21.7, 9.8), and D(30.6, 15.8, 53.6) in a triangular coordinate graph represented with a coordinate of (Ge, Sb—Bi, Te) and a Bi content in the recording layer is 4 atom % and more and less than 13 atom %.Type: GrantFiled: August 30, 2007Date of Patent: September 6, 2011Assignee: Panasonic CorporationInventors: Hideo Kusada, Tomiharu Hosaka, Noboru Yamada
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Patent number: 8007982Abstract: An optical information recording medium, which is made of a resin provided with photoreactivity containing organometal compound, has a recording layer on which, after a photoreaction are brought about when predetermined initialization light is irradiated to the medium and then the resin is hardened, at a time of recording information, a recording mark is formed when predetermined recording light is condensed to the medium, and a temperature of the medium near a focal point of the recording light is increased and the organometal compound is transubstantiated, and at a time of reproducing information, the information is reproduced based on returned light according to predetermined reading light being irradiated.Type: GrantFiled: November 15, 2007Date of Patent: August 30, 2011Assignee: Sony CorporationInventors: Hiroshi Uchiyama, Hisayuki Yamatsu, Norihiro Tanabe
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Patent number: 8007887Abstract: An optical information recording medium that can simultaneously achieve both a high transmittance and high signal quality of an information layer, improve the reliability of long-term conservation, and reduce the manufacturing cost, and a manufacturing method thereof are provided. In an optical information recording medium including at least one information layer on a substrate, at least one of the information layers has a recording layer and a dielectric layer, the recording layer contains Te, O, and M (M is one or a plurality of elements selected from Au, Pd, and Pt) as major components, the dielectric layer has a thermal conductivity of 0.01 W/K·cm or more, and the dielectric layer has an extinction coefficient of 0 through 1.0 inclusive.Type: GrantFiled: October 30, 2006Date of Patent: August 30, 2011Assignee: Panasonic CorporationInventors: Haruhiko Habuta, Morio Tomiyama, Hideki Kitaura
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Patent number: 7993720Abstract: An information recording medium of the present invention includes recording layers 19 and 26 whose phase can change by an optical or an electrical system so as to be detectable, and interface layers 18, 20, 25 and 27, which are in contact with the recording layers 19 and 26, to serve as oxide layers. The recording layer 19 contains a Ge—Bi—Te-M material represented by a formula: Ge?Bi?Te?M100-?-?-? (atom %), where M denotes at least one element selected from Al, Ga, In and Mn, and ?, ? and ? satisfy 25???60, 0<??18, 35???55, and 82??+?+?<100. The interface layers 18, 20, 25 and 27 contain at least one oxide of the element M contained in the recording layers 19 and 26.Type: GrantFiled: December 18, 2006Date of Patent: August 9, 2011Assignee: Panasonic CorporationInventors: Yoshitaka Sakaue, Rie Kojima, Takashi Nishihara
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Patent number: 7960006Abstract: A next-generation optical recording medium has two or more information layers which include a translucent information layer. The translucent information layer has a recording film and an interface layer, provided adjacent to the recording film on the side of the light incident surface. The recording film is made of a phase change material having SbxTeyGez elements and elemental ratios. Y satisfies 5?y?15 and z satisfies 5?z?15. When In having an elemental ratio of a is further added and x+y+z+a=100 holds, a satisfies 4?a?15. The interface layer comprises of ZrO2—Cr2O3 film thickness of which is in a range of from 2 nm to 10 nm. When ZrO2:Cr2O3?C:D (mol %), the compositional ratios ZrO2 and Cr2O3 in the ZrO2—Cr2O3 film, holds, the C satisfies 20?C?90, and the D satisfies 10?D?80, and the C and the D satisfy C+D=100. The ZrO2 is stabilized ZrO2 which contains Y2O3, when ZrO2:Y2O3=(100?X):X (mol %), the compositional ratios ZrO2 and Y2O3 in the stabilized ZrO2, holds, the X satisfies 2?X?10.Type: GrantFiled: January 22, 2008Date of Patent: June 14, 2011Assignee: TDK CorporationInventors: Hiroshi Shingai, Tatsuya Kato, Masanori Kosuda, Hiroshi Takasaki, Hideki Hirata, Hajime Utsunomiya
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Patent number: 7947353Abstract: In each of at least two information layers (1, 2) which constitute a information recording medium having a plurality of information layers on its one side, the compositions of the recording layer (7) and the dielectric layers (6, 8) adjacent to the recording layer (7) in one information layer (1) are common to the compositions of the corresponding layers (12, 11, 13) in the other information layer, so that the recording layers (7, 12) and the dielectric layers (6, 11) and (8, 13) in the two information layers (1, 2) can be formed in common sputtering film-forming chambers without the replacement of targets, which makes it possible to produce a multi-layer single-sided recording medium with a decreased time loss in the production process.Type: GrantFiled: July 6, 2006Date of Patent: May 24, 2011Assignee: Panasonic CorporationInventors: Yoshitaka Sakaue, Takashi Nishihara, Rie Kojima, Akio Tsuchino
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Patent number: 7943223Abstract: An optical recording medium is provided which includes two or more information layers in which an Sb-based eutectic material is used as the material for a recording film of a translucent information layer. There is also provided a recording film material for the optical recording medium. The translucent information layer is configured to include a recording film formed of a phase change material SbxGeyInz containing Sb, Ge, and In in an atomic ratio of x:y:z, where 5?y?15 and 4?z?15 are satisfied. The recording film further includes Te in an atomic ratio of a, provided that x+y+z+a=100 and 4?a?15 are satisfied. An interface layer formed of a ZrO2—Cr2O3 film having a thickness of 2 nm or more and 10 nm or less is provided on the laser beam incident side of the recording film. When the compositional ratio of the ZrO2—Cr2O3 film is given by ZrO2:Cr2O3=B:C (mol %), 20?B?90, 10?C?80, and B+C=100 are satisfied.Type: GrantFiled: March 13, 2008Date of Patent: May 17, 2011Assignee: TDK CorporationInventors: Hiroshi Shingai, Tatsuya Kato, Masanori Kosuda, Hiroshi Takasaki, Hideki Hirata, Jajime Utsunomiya
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Patent number: 7910191Abstract: A method for manufacturing an optical recording medium includes forming a light-transmitting cover layer over an information layer by depositing a predetermined volume of a liquid resin on the information layer. The method may further include forming a disc rib over an outer periphery of the information bearing side of the substrate, to stop flow of the deposited resin beyond the outer disc periphery. An optical recording medium formed through such a method includes a disc rib delimiting an outer diameter of the light-transmitting cover layer.Type: GrantFiled: March 6, 2007Date of Patent: March 22, 2011Assignee: Cinram International Inc.Inventors: William R. Mueller, Ed Pickutoski
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Patent number: 7897231Abstract: The present invention provides an information recording medium with high reliability and excellent repeated rewriting performance even when no interface layer is formed and a method for manufacturing the same. Accordingly, the information recording medium for carrying out recording and/or reproducing by light irradiation or electric energy application has a material layer containing at least one element selected from a group GM consisting of Sn and Ga, at least one element selected from a group GL consisting of Ta and Y, and oxygen.Type: GrantFiled: March 24, 2006Date of Patent: March 1, 2011Assignee: Panasonic CorporationInventors: Yukako Doi, Rie Kojima, Noboru Yamada
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Patent number: 7892620Abstract: There is provided a dielectric material containing no sulfur (S), and there is provided an information recording medium that affords high signal quality and excellent recording sensitivity and repeated rewrite characteristics, even though no interface layer is provided between a reflective layer and a dielectric layer. To this end, the present invention is an information recording medium that is equipped with at least a recording layer and undergoes phase change when the recording layer is irradiated with a laser beam or when current is applied, comprising an oxide-fluoride dielectric layer that includes indium (In), an element M1 (where M1 is at least one element selected from among Zr, Hf, Y, Ti, Nb, Ta, Cr, Ga, and Si), oxygen (O), an element M2 (where M2 is at least one element selected from among La, Ce, Pr, Nd, Gd, Tb, Dy, Ho, Er, Yb, Mg, Ca, and Sr), and fluorine (F).Type: GrantFiled: November 1, 2006Date of Patent: February 22, 2011Assignee: Panasonic CorporationInventors: Akio Tsuchino, Takashi Nishihara, Rie Kojima
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Patent number: 7864656Abstract: An optical storage medium has a substrate and a cover layer that allows light to pass therethrough in recording or reproduction. Provided between the substrate and the cover layer are at least a reflective film, a first dielectric film, a recording film, and a second dielectric film formed in this order from the substrate side. Provided further between the second dielectric film and the cover layer is a damp-proof film that is at least partially an amorphous film and contains at least an indium oxide.Type: GrantFiled: May 2, 2008Date of Patent: January 4, 2011Assignee: Victor Company of Japan, Ltd.Inventors: Hiroshi Tabata, Ukou Sumoto
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Patent number: 7858166Abstract: According to one embodiment, in a phase change optical disk which has a substrate and a multi-layered including an interference film, phase change recording film, interface film, and reflecting film, and in which information is reversibly recorded in or erased from the recording film by using light, an element (e.g., Ge or Te) forming the phase change recording film has segregation or a concentration distribution in the thickness direction of the recording film from a portion in contact with the phase change recording film.Type: GrantFiled: January 31, 2007Date of Patent: December 28, 2010Assignee: Kabushiki Kaisha ToshibaInventors: Tsukasa Nakai, Noritake Oomachi, Sumio Ashida, Naomasa Nakamura, Keiichiro Yusu, Yasuhiro Satoh
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Patent number: 7858290Abstract: An information recording medium includes a substrate and an information layer formed on the substrate. The information layer includes a recording layer whose phase can be changed between a crystalline phase and an amorphous phase by irradiation with a laser beam or application of electric energy; a Cr-containing layer including at least Cr and O, arranged in contact with a first surface of the recording layer; and a Ga-containing layer including at least Ga and O, arranged in contact with a second surface of the recording layer.Type: GrantFiled: September 29, 2004Date of Patent: December 28, 2010Assignee: Panasonic CorporationInventors: Takashi Nishihara, Yukako Doi, Rie Kojima, Noboru Yamada
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Patent number: 7846525Abstract: An information recording medium with high recording sensitivity, superior repeat overwriting capability and favorable signal storage stability during information recording is offered. For this purpose, an information recording medium comprises one or more information layers that include a phase-change recording layer, wherein at least one of the information layers includes, a Cr-containing layer containing Cr and O that contact with one side of a surface of the recording layer, and an In-containing layer containing In and O that contact with the other side of the surface of the recording layer.Type: GrantFiled: April 20, 2006Date of Patent: December 7, 2010Assignee: Panasonic CorporationInventors: Akio Tsuchino, Takashi Nishihara, Rie Kojima
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Patent number: 7803443Abstract: A phase change optical disk includes a first dielectric film, a recording film, a second dielectric film and a reflecting film which are consecutively formed on a substrate. The second dielectric film includes therein a zinc sulfide at a rate of 10 to 40 mol % and a tantalum oxide at a rate of 20 to 50 mol %, for preventing sulfuration of Ag in the reflecting film.Type: GrantFiled: November 1, 2006Date of Patent: September 28, 2010Assignee: NEC CorporationInventors: Shuichi Ohkubo, Eiji Kariyada
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Patent number: 7803445Abstract: The main object of the present invention is to provide an optical recording medium with no need to use a control subject substance of the PRTR law, capable of using for an optical recording device with a blue laser, and giving consideration to the environmental aspect. To attain the object, the present invention provides an optical recording medium comprising: a reflective layer containing an aluminum composition as the main component including both aluminum or an aluminum alloy and a metal oxide of a metal other than aluminum; and a dielectric protective layer, formed in contact with the reflective layer, containing a niobium composition as the main component including both silicon dioxide or titanium dioxide and a niobium nitrided oxide.Type: GrantFiled: February 8, 2006Date of Patent: September 28, 2010Assignee: Pioneer CorporationInventor: Yasuo Hosoda
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Patent number: 7767284Abstract: The object of the present invention is to provide an optical recording medium which comprises a substrate, and a first information layer and a second information layer disposed on the substrate, and an intermediate layer disposed between the first information layer and the second information layer, wherein any one of recording and reproducing is performed in the first information layer and the second information layer by irradiating a laser beam from the first information layer side, the second information layer comprises a protective layer, a second dye layer which comprises an organic dye, an oxidized layer, and a reflective layer in this order from the laser beam irradiation side, and the oxidized layer comprises an oxide which is a material constituting the reflective layer.Type: GrantFiled: April 25, 2005Date of Patent: August 3, 2010Assignee: Ricoh Company, Ltd.Inventors: Michiaki Shinotsuka, Masaru Shinkai, Hiroyuki Iwasa, Tatsuo Mikami, Yuki Nakamura, Tohru Yashiro
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Patent number: 7767285Abstract: A phase-change optical recording medium has a recording film that brings about reversible phase-change between a crystalline phase and an amorphous phase upon irradiation with light and an interface film formed in contact with at least one surface of the recording film and comprising hafnium (Hf), silicon (Si), oxygen (O) and carbon (C).Type: GrantFiled: February 22, 2007Date of Patent: August 3, 2010Assignee: Kabushiki Kaisha ToshibaInventors: Tsukasa Nakai, Sumio Ashida, Keiichiro Yusu, Takayuki Tsukamoto, Noritake Oomachi, Naomasa Nakamura, Katsutaro Ichihara
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Publication number: 20100189950Abstract: The optical storage medium according to the invention uses a mask layer as a super resolution near field structure, which comprises a doped semiconductor material. The semiconductor material is n-doped particularly such that the reflectivity of the semiconductor material is increased, when irradiated with a laser beam. As a semiconductor material advantageously an indium alloy and as a doping material selenium or tellurium can be used. For the manufacturing of a respective optical storage medium a sputtering method for depositing the doped semiconductor material as the mask layer can be used, wherein the dopant is included already in the semiconductor sputtering target.Type: ApplicationFiled: October 11, 2007Publication date: July 29, 2010Inventors: Christophe Fery, Larisa von Riewet, Gael Pilard, Stephan Knappmann
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Patent number: 7736715Abstract: In a single-sided, recordable/rewritable phase change optical recording medium having one or more layers, an interface layer adjacent to a phase change optical recording film contains at least Zr (zirconium), O (oxygen), and N (nitrogen), and further contains one or both of Y (yttrium) and Nb (niobium).Type: GrantFiled: June 8, 2006Date of Patent: June 15, 2010Assignee: Kabushiki Kaisha ToshibaInventors: Tsukasa Nakai, Noritake Oomachi, Sumio Ashida, Naomasa Nakamura, Keiichiro Yusu, Yasuhiro Satoh
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Patent number: 7727610Abstract: Compositions for protective films for optical disc are provided. Compositions for protective films, particularly compositions for protective films for optical discs having low viscosity and low shrinkage without compromising scratch resistance even when a dilution solvent is not used. The compositions for protective films for optical discs include a composition for protective films containing a UV-curable acrylic radical-based resin as the main component including a multifunctional acrylic monomer, a multifunctional acrylic oligomer and a bifunctional acrylic monomer containing repeating units including at least one of an ethoxy and propoxy group as starting materials for the acrylic radical-based resin; and a photoinitiator.Type: GrantFiled: October 17, 2006Date of Patent: June 1, 2010Assignees: Sony Corporation, Sony Chemical & Information Device CorporationInventor: Kiichiro Oguni
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Publication number: 20100112269Abstract: An optical recording medium is provided. The optical recording medium includes a first recording layer and a second recording layer. The second recording layer includes a compound in the form of (CuXM(1-X))YO(1-Y), where M is one of Sn, Si, Zn, Al, Mg, Ge, Sb or Te, and X is approximately 0.5 to 1, and Y is approximately 0.001 to 0.1.Type: ApplicationFiled: June 11, 2009Publication date: May 6, 2010Inventor: Kwanglyul LEE
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Patent number: 7704582Abstract: The optical recording medium according to one embodiment of the present invention includes a substrate, a reflective layer located on the upper side of the substrate and reflecting an incident laser beam, and an information recording layer located on the reflective layer. The information recording layer includes a first recording layer containing a compound in the form of AXB1-X (0.8?X?0.9), wherein A is Ag and B is Sb and Te, and a second recording layer containing at least one element selected from the group consisting of Si, Sn, Sb and Ge. The laser beam is irradiated on the first recording layer prior to the second recording layer. Therefore, the optical recording medium of the present invention may provide high recording density and transmittance velocity suitable for BLU-RAY DISC system.Type: GrantFiled: December 19, 2005Date of Patent: April 27, 2010Assignee: LG Electronics Inc.Inventor: Kwang Lyul Lee
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Patent number: 7682677Abstract: An information recording medium with high recording sensitivity and superior repeat overwriting capability. The information recording medium (15) comprising at least recording layer (104) recording and/or reproducing information through irradiation with a laser beam or application of an electric current, and second dielectric layer (106) on substrate (14), wherein the second dielectric layer (106) comprises M1 (provided that M1 is at least one element selected from Sc, Y, La, Gd, Dy and Yb) and O.Type: GrantFiled: September 6, 2005Date of Patent: March 23, 2010Assignee: Panasonic CorporationInventors: Takashi Nishihara, Akio Tsuchino, Rie Kojima, Noboru Yamada
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Patent number: 7645499Abstract: The optical information recording medium of the present invention includes a plurality of information layers provided on a substrate and an optical separating layer provided between information layer adjacent to each other, and information is recorded or reproduced by irradiation of a laser beam. When an information layer that is provided closest to a laser beam incident side of the plurality of information layers is taken as a first information layer and an optical separating layer provided in contact with the first information layer is taken as a first optical separating layer, then the first information layer comprises a recording layer, a transmittance adjusting layer that adjusts a transmittance of the first information layer, and a low refractive index layer provided between the transmittance adjusting layer and the first optical separating layer.Type: GrantFiled: October 9, 2003Date of Patent: January 12, 2010Assignee: Panasonic CorporationInventors: Haruhiko Habuta, Ken'ichi Nagata, Yoshitaka Sakaue, Hideo Kusada
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Publication number: 20090317581Abstract: An optical information recording medium having the same recording volume as that of DVD-ROM is obtained which shows excellent characteristics at recording linear velocities within a range of twice linear velocity of DVD (about 8.2 m/s) to five times liner velocity of DVD (about 20.5 m/s) and excellent archival stability, by a construction including a transparent substrate, a recording layer which is formed on the substrate directly or with another layer interposed therebetween and can change in phase reversibly by a laser beam irradiation, wherein the composition of the recording layer is within a region bounded by composition points A(41.2, 7.4, 51.4), B(39.8, 10.5, 49.7), C(28.5, 21.7, 9.8), and D(30.6, 15.8, 53.6) in a triangular coordinate graph represented with a coordinate of (Ge, Sb—Bi, Te) and a Bi content in the recording layer is 4 atom % and more and less than 13 atom %.Type: ApplicationFiled: August 30, 2007Publication date: December 24, 2009Inventors: Hideo Kusada, Tomiharu Hosaka, Noboru Yamada
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Patent number: 7632352Abstract: Provided is a spin coating apparatus having a ring-shaped or polygonal auxiliary member for use in manufacture of a coated substrate via spin coating, wherein the auxiliary member is positioned adjacent to the side of a substrate for coating, within a range of a spaced distance of 0.03 to 0.8 mm and a range of a height deviation of less than 0.1 mm, upon mounting the substrate. When a surface of a substrate for coating is spin coated with a coating agent using the apparatus of the present invention, it is possible to eliminate or effectively reduce a ski-jump phenomenon at end portions of a coated substrate occurring when spin coating is performed, thereby resulting in uniform coating of a coating solution on the substrate, and it is also possible to effectively decrease contamination of the substrate for coating due to inflow or stay of the remaining coating agent.Type: GrantFiled: December 9, 2005Date of Patent: December 15, 2009Assignee: LG Chem, Ltd.Inventors: Tae-sik Kang, Seongkeun Lee, Youngjun Hong
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Patent number: 7611823Abstract: Image formation via photoinduced fluorescence changes in a polymeric medium with two-photon fluorescence readout of a multi-layer structure. Fluorophore-containing polymers, possessing one or more basic functional groups, underwent protonation in the presence of a photoinduced acid generator upon exposure to a broad-band UV light source or fast-pulsed red to near-IR laser irradiation. Solution studies demonstrated formation of monoprotonated and diprotonated species upon irradiation, each resulting in distinctly different absorption and fluorescence properties. The fluorescence of the original, neutral, fluorophore was reduced upon monoprotonation leading to a concomitant increase in fluorescence at longer wavelengths due to the monoprotonated form, the basis for multichannel data readout.Type: GrantFiled: November 10, 2005Date of Patent: November 3, 2009Assignee: University of Central Florida Research Foundation, Inc.Inventor: Kevin D. Belfield
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Patent number: 7566523Abstract: Optical information-recording media comprise a first transparent substrate through which a laser beam enters, a first information-recording layer deposited on the first transparent substrate, a first reflection film formed on the first information-recording layer, an intermediate layer deposited on the first reflection film, a second information-recording layer formed on the intermediate layer, a second reflection film deposited on the second information-recording layer, and a second substrate provided on the second reflection film. The recording film of each of the first and second information-recording layers has a main composition represented by (GeTe)xSb2?yInyTe3, and its composition ratio is within ranges of 0.04?y<2 and 4?x?8.Type: GrantFiled: February 19, 2004Date of Patent: July 28, 2009Assignee: NEC CorporationInventor: Shuichi Ohkubo
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Patent number: 7510753Abstract: A Phase-change optical recording media includes a recording film that causes reversible phase-change between a crystalline phase and an amorphous phase on irradiation with light, and an interface film formed in contact with at least one surface of the recording film and containing Hf (hafnium), O (oxygen) and N (nitrogen).Type: GrantFiled: September 27, 2005Date of Patent: March 31, 2009Assignee: Kabushiki Kaisha ToshibaInventors: Tsukasa Nakai, Sumio Ashida, Keiichiro Yusu, Noritake Oomachi, Naomasa Nakamura
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Publication number: 20090075015Abstract: An optical disc having machine-readable, information encoding features includes a coating comprising a tellurapyrylium dye irreversibly bleachable by light. The dye, once bleached, is operative to change the index of refraction of the dye to inhibit reading of the information encoding features.Type: ApplicationFiled: July 18, 2008Publication date: March 19, 2009Inventors: Michael R. Detty, Lief C. Larson
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Patent number: 7491436Abstract: An optical information recording medium comprising a substrate, recording layer and reflecting layer, characterized in that a layer containing a mixture of carbide and oxide is disposed over a surface of the reflecting layer which faces to the recording layer. The carbide is a carbide of at least one metal selected from Ti, Zr, V, Nb, Ta, Cr, Mo and W, and the oxide is an oxide of at least one metal selected from Ti, Zr, V, Nb, Ta, Cr, Mo and W.Type: GrantFiled: October 11, 2005Date of Patent: February 17, 2009Assignee: Ricoh Company, Ltd.Inventors: Masaru Shinkai, Michiaki Shinotsuka, Hiroyuki Iwasa
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Patent number: 7485355Abstract: An optical information recording medium includes the first to the n-th information layers (where n is an integer not less than 3) arranged in this order from a laser beam incident side. Each information layer includes a recording layer containing Te, O and M, where M denotes at least one element selected from the group consisting of Al, Si, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ru, Rh, Pd, Ag, In, Sn, Sb, Hf, Ta, W, Re, Os, Ir, Pt, Au and Bi. Concentrations of oxygen atoms contained in the first to the n-th recording layers, namely C(1) to C(n?1), satisfy the following relationships: C(1)?C(2)? . . . ?C(n?2)?C(n?1), and C(1)?C(n?1). When two information layers are included, the oxygen atom concentration of the first information layer is made larger than that of the second information layer.Type: GrantFiled: September 30, 2003Date of Patent: February 3, 2009Assignee: Panasonic CorporationInventors: Hideki Kitaura, Noboru Yamada
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Patent number: 7485356Abstract: An optical recording medium includes an information layer having a recording film. The recording film contains Sb of 79 atomic % to 95 atomic % and Ge of 5 atomic % to 21 atomic % as main components, and is formed of a phase change material which does not contain the elements in the sixteenth group of the periodic table.Type: GrantFiled: July 15, 2005Date of Patent: February 3, 2009Assignee: TDK CorporationInventors: Hiroshi Shingai, Hiroshi Chihara, Hideki Hirata, Hideaki Miura
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Publication number: 20090029091Abstract: An optical recording medium having first protective layer, recording layer, second protective layer, and reflective layer, wherein the recording layer contains a phase-change material represented by Formula (1?1), Formula (1-2), or Formula (1-3); the second protective layer contains one selected from zinc oxides, indium oxides, tin oxides, mixtures thereof, and materials Formula (2), and materials Formula (3). Formula (1?1): In?iSb?iX1?i(X1: Ge, Te, Zn, Mn, or mixture thereof, 0.10??1?0.25, 0.65??1?0.80, and 0.04??1?0.15) Formula (1-2): Ga?2Sb?2SnY2Ges2X2?2 (X2: Te, Zn, Mn, In, or mixture thereof, 0.04??2?0.09, 0.56?62?0.79, 0.05??2<0.30, 0.03??2?0.19, and 0??2?0.09) Formula (1-3): Mn?3Sb?3SnY3Ge?3X3?3 (X3: Te, In, Zn, Bi, or mixture thereof, 0.04??3?0.09, 0.56?63?0.79, 0.05??3?0.29, 0.03??3?0.23, and 0??3?0.09) Formula (2): ZnO—Al—Y [(100??4?64):?4:?4] (Y: Mn, Ge, Ti, or mixture thereof, 0.5??4?10.0, and 0?B4?25.Type: ApplicationFiled: March 2, 2007Publication date: January 29, 2009Inventors: Hiroshi Deguchi, Eiko Hibino, Hiroko Ohkura, Kazunori Ito, Hajime Yuzurihara, Hiroyuki Iwasa
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Patent number: 7482109Abstract: A phase change optical recording medium includes at least a supporting substrate and a recording layer essentially consisting of AgInSbTe alloy compositions implementing recording and readout steps utilizing changes in reflectivity. The recording medium is characterized by the relation v0?0.7 vWH, where the critical relative velocity of phase change, v0, defined by the value of v, at which the differential coefficient, ?dR(v)/dv, reaches a maximum, when the recording medium moves against an optical unit during the recording steps at a relative velocity, v, ranging from minimum and maximum relative velocities warranted for the recording medium, vWL and vWH, respectively. When the reflectivity is measured with varying erase power PE at the linear relative scanning velocity v0, the reflectivity of the recording layer as a function of erase power, R(PE), preferably has a minimum. The recording layer has an activation energy of deterioration equal to or greater than 1.Type: GrantFiled: January 31, 2002Date of Patent: January 27, 2009Assignee: Ricoh Company, Ltd.Inventors: Masaki Katoh, Yuki Nakamura, Katsuyuki Yamada
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Patent number: 7449225Abstract: An information recording medium of the present invention includes a substrate and an information layer arranged on the substrate. The information layer includes a recording layer that is changed in phase reversibly between a crystalline phase and an amorphous phase by at least one of optical means and electrical means, and at least one crystalline nucleation layer that contains at least one element selected from Bi and Te and at least one element (M1) selected from Sc, Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Yb, and Lu and is provided in contact with the recording layer.Type: GrantFiled: September 12, 2003Date of Patent: November 11, 2008Assignee: Panasonic CorporationInventors: Takashi Nishihara, Rie Kojima, Noboru Yamada, Takeshi Sakaguchi
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Patent number: 7442424Abstract: A super-resolution information storage medium having recording marks or pits that are smaller than the resolution limit of a beam incident from an information recording and/or reproducing apparatus, and the information recording and/or reproducing apparatus. The information storage medium includes a substrate and at least one super-resolution reproduction layer containing a super-resolution material and a high melting point material with a melting point higher than that of the super-resolution material formed on the substrate. The high melting point material suppresses movement of the super-resolution material in a melted phase so as to prevent signal degradation caused by repeated reproduction.Type: GrantFiled: May 3, 2005Date of Patent: October 28, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: In-oh Hwang, Myong-do Ro, Joo-ho Kim, Hyun-ki Kim, Nak-hyun Kim, Chang-min Park
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Patent number: 7438965Abstract: It is an object of the present invention to provide a phase-change information recording medium, and the like, which is easy to perform initial crystallization, exhibits good recording sensitivity at a linear velocity as high as 10 double speeds or more with as much capacity as DVD-ROM, is capable of overwrite recording and has good storage reliability. For this purpose, the phase-change information recording medium comprises a substrate and at least a first protective layer, a phase-change recording layer, a second protective layer, and a reflective layer disposed on the substrate in one of this sequence and reverse sequence wherein the phase-change recording layer comprises a composition expressed by Sn?Sb?Ga?Ge?Te??X? (In this regard, X represents at lease one element selected from Ag, Zn, In and Cu. ?, ?, ?, ?, ? and ? represent composition ratio (atomic percent) of each element and are expressed as 5???25, 40???91, 2???20, 2???20, 0???10, 0???10 and ?+?+?+?+?+?=100).Type: GrantFiled: October 4, 2005Date of Patent: October 21, 2008Assignee: Ricoh Company, Ltd.Inventors: Hiroko Ohkura, Kazunori Ito, Hiroshi Deguchi, Masaki Kato, Mikiko Abe, Hiroyoshi Sekiguchi, Makoto Harigaya, Masaru Shinkai
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Patent number: 7431973Abstract: A recording medium has at least a recording layer on a transparent substrate. The recording layer has at least a first phase-changeable film and a second phase-changeable film in that order, starting on the side closest to the transparent substrate. The first phase-changeable film and the second phase-changeable film each contains at least 10 atom % and no more than 50 atom % germanium and at least 45 atom % and no more than 60 atom % tellurium. Also at least one of the phase-changeable films contains bismuth.Type: GrantFiled: February 17, 2005Date of Patent: October 7, 2008Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hideki Kitaura, Noboru Yamada, Rie Kojima
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Patent number: 7422838Abstract: A phase-change optical recording medium is disclosed including a supporting substrate and the following contiguous layers formed on the supporting substrate in the order recited such as a first dielectric layer, a recording layer, a second dielectric layer, a metal/alloy layer, and an ultraviolet light curing resinous layer. The recording layer is characterized by its uppermost recrystallization linear velocity ranging from about 5.0 m/sec to about 10.0 m/sec, which can be utilized in read/write/erase operations for the recording medium at linear velocities higher than the quad-speed as well.Type: GrantFiled: May 11, 2000Date of Patent: September 9, 2008Assignee: Ricoh Company, Ltd.Inventors: Katsuyuki Yamada, Yuki Nakamura, Tatsuo Mikami, Eiji Noda, Kayo Katoh
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Patent number: 7407697Abstract: An information recording medium is provided that has high recording sensitivity for recording information and superior repeated rewriting performance. The information recording medium has at least a recording layer that is changeable between a crystalline phase and an amorphous phase by applying a laser beam or electric current and a dielectric layer. The dielectric layer contains at least C, Si, Sn and O. Alternatively, the information recording medium includes at least two information layers with at least one of the information layer including at least a recording layer that is changeable between a crystalline phase and an amorphous phase by applying a laser beam or electric current and a dielectric layer. The dielectric layer contains at least C, Si, Sn and O.Type: GrantFiled: March 7, 2005Date of Patent: August 5, 2008Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Takashi Nishihara, Yukako Doi, Rie Kojima, Noboru Yamada
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Patent number: 7393574Abstract: In an information recording medium, a Bi—Ge—Te material is adopted as a phase-change recording layer material. A C—Ta—O material is used for at least any one of first and second boundary layers which are in contact with a recording layer.Type: GrantFiled: April 4, 2005Date of Patent: July 1, 2008Assignee: Hitachi Maxwell, Ltd.Inventors: Tamotsu Fuchioka, Makoto Iimura, Makoto Miyamoto, Yoshihiro Ikari
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Patent number: 7384723Abstract: An optical information recording medium including a substrate having successively disposed thereon a recording layer, an interlayer, a pressure sensitive adhesive layer and a cover film in which information is recordable and reproducible by irradiating laser light and the pressure sensitive adhesive layer contains a polymer having a glass transition temperature Tg of 0° C. or lower, as well as a method for producing an optical information recording medium including adhering a cover layer to a surface of a recording layer so that a pressure sensitive adhesive layer is abutted on the surface of the recording layer, and an optical information recording medium produced by the method.Type: GrantFiled: January 22, 2003Date of Patent: June 10, 2008Assignee: FUJIFILM CorporationInventors: Takeshi Kakuta, Toshio Ishida, Takako Ozawa
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Patent number: 7384678Abstract: To provide an optical recording medium and the like that is adapted to higher density and higher speed recording of 8 times or more than that of DVD (about 28 m/sec or more) and that exhibits superior repeating and reservation properties. An optical recording medium is provided that comprises a substrate, and a recording layer, wherein at least one of recording, reproducing, erasing, and rewriting of information is carried out by means of reversible phase changes at marks on the recording layer, the reversible phase changes at marks are induced between crystalline and amorphous states by laser irradiation, the length of the respective marks is 0.4 ?m or less in the traveling direction of the laser irradiation, and the recording layer has a composition expressed by the formula: In?Sb?, wherein ? and ? are atomic percent of the respective elements; 0.73??/(?+?)?0.Type: GrantFiled: May 10, 2006Date of Patent: June 10, 2008Assignee: Ricoh Company, Ltd.Inventors: Hiroshi Miura, Kazunori Ito, Makoto Harigaya, Eiko Hibino, Masaru Shinkai, Hiroko Ohkura
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Patent number: 7371448Abstract: This invention discloses a novel rewritable phase-change recording medium for optical data storage, which is based on the GaSbTe ternary alloy system. The designed compositions reside on the Sb7Te3—GaSb and Sb2Te3—GaSb pseudo-binary tielines, and the claimed region can be expressed by the formula (SbxTe100-x)1-z(GaySb100-y)z, 35?x?80, 40?y?50, 0.05?z?0.9. The crystallized phase of the GaSbTe films is a single phase after laser annealing, and the crystal structure is hexagonal with continuous variation in lattice constants. The lattice parameters, a is from 4.255 ? to 4.313 ? and c is from 11.200 ? to 11.657 ?, corresponding to the c/a ratio 2.60 to 2.73. The crystallization kinetics shows increased crystallization temperature (181 to 327° C.) and activation energy (2.8 to 6.5 eV) with increasing GaSb content.Type: GrantFiled: December 17, 2004Date of Patent: May 13, 2008Assignee: National Tsing Hua UniversityInventors: Tsung Shune Chin, Chien Ming Lee
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Patent number: 7368223Abstract: A multi-stack optical data storage medium for rewritable recording by a focused laser-light beam, the medium having a substrate with deposited on aside thereof: a first recording stack comprising a phase-change type recording layer at least one further recording stack comprising a phase-change type recording layer, a transparent spacer layer adjacent each further recording stack. The further recording stack is sufficiently transmissive to ensure proper sensitivity for reading and recording in the first recording stack. For this purpose, at least one indium tin oxide layer is present in at least one of the further recording stacks. The indium tin oxide layer further ensures proper cooling behavior of the recording layer of the further recording stack in order to obtain sufficient recording performance in the farther recording stack.Type: GrantFiled: May 27, 2002Date of Patent: May 6, 2008Assignee: Koninklijke Philips Electronics N.V.Inventors: Erwin Rinaldo Meinders, Hermanus Johannes Borg, Guo-Fu Zhou, Johannes Cornelis Norbertus Rijpers
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Patent number: RE42222Abstract: Phase-change type, reversible optical information recording medium, being possible for recording, reproducing, erasing, and rewriting of information, by use of a laser beam. This invention, consists of recording thin film of ternary elements, for example, containing Ge, Te, Sb/or Bi or quaternary elements containing the fourth element of Se with which a part of Te is replaced, which is established on such surface—flat substrates as glass or plastics. In this case, the component ratio of Te and Se is selected not to be excess for other elements, such as Ge, Sb/or Bi so as to be fixed as stable compounds of stoichiometric compositions of GeTe, Sb2Te3/or Bi2Te3, or GeSe, Sb2Se3/Bi2Se3 when crystallized. Strictly speaking, a concentration of each component is selected to have proper ratio of the number of atoms each other so as to represent whole composition as the sum of each component. By this treatment, it is possible to have high crystallization speed and long cyclability of recording/erasing.Type: GrantFiled: March 14, 2003Date of Patent: March 15, 2011Assignee: Matsushita Electronic Industrial Co., Ltd.Inventors: Norboru Yamada, Kunio Kimura, Masatoshi Takao, Susumu Sanai