Having Read-write Layer Of 100 Percent Organic Or Organometallic Composition Or Mixtures Thereof Patents (Class 430/270.14)
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Patent number: 6835432Abstract: An optical disc comprises a first base plate having a surface in which a recess is formed and a multi-layer structure disposed over the surface. The multi-layer structure includes a reflection layer, a recording layer, and a transparent member. The reflection layer is disposed on the surface of the first base plate. The recording layer is formed on the reflection layer for substantially filling an inside of the recess. The transparent member is disposed for covering the recording layer, and is capable of transmitting writing/reading radiation.Type: GrantFiled: September 25, 2001Date of Patent: December 28, 2004Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Shinya Abe, Kazuhiro Hayashi
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Patent number: 6815030Abstract: An optical information recording medium achieving stable recording and reading characteristics and having good storage stability including light resistance and heat resistance by preventing colorants contained in a recording layer therein from being decomposed, and also an optical information recording medium that can be individually differentiated from others by outward appearance. The optical information recording medium includes a substrate having successively disposed thereon at least a light-reflective layer, a recording layer on which information is recorded by laser light of a wavelength no longer than 500 nm, and a cover layer containing a UV absorbent that blocks out light of a wavelength no longer than 400 nm and/or a dye that blocks out light of a wavelength no shorter than 500 nm. A second substrate may be disposed opposite to a side of the optical information recording medium that is irradiated with light and may be colored.Type: GrantFiled: June 3, 2002Date of Patent: November 9, 2004Assignee: Fuji Photo Film Co., Ltd.Inventors: Toshio Ishida, Takeshi Kakuta, Shinichi Kato
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Patent number: 6815033Abstract: An optical recording medium comprising a substrate and a recording layer on which recording and readout of information can be carried out by laser.Type: GrantFiled: December 6, 2002Date of Patent: November 9, 2004Assignee: Mitsubishi Chemical CorporationInventors: Takashi Miyazawa, Shuichi Maeda, Yasuhiro Kameyama
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Patent number: 6815031Abstract: The invention discloses new indolestyryl compounds and their uses for a high-density optical recording medium. The invention uses the new indolestyryl compounds to form the recording layer of a high-density recording medium. The new indolestyryl compounds are easy to prepare and purify, so they are cheaper when comparing to the compounds generally used in high-density optical recording media. The indolestyryl compounds have a maximum absorption for light wavelengths in the range of 500 nanometers to 700 nanometers. The indolestyryl compounds also have high sensitivity and chemical stability toward light and heat. Using the new indolestyryl compounds to form high-density optical recording media can match up with the short-wavelength laser beam for high-density optical recording media and have the advantage of a stable quality.Type: GrantFiled: September 13, 2002Date of Patent: November 9, 2004Assignee: Industrial Technology Research InstituteInventors: Chien-Liang Huang, Shin-Shin Wang, Wen-Yih Liao, Hui-Ping Tsai, Chuen-Fuw Yan, Chii-Chang Lai, Tzuan-Ren Jeng, Jong-Lieh Yang, Ming-Chia Lee
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Publication number: 20040214106Abstract: An optical recording material for binary, multibit or volume data storage is described. The optical recording material comprises: (a) at least one dyestuff selected from polymeric azo dyestuffs and oligomeric azo dyestuffs, the dyestuff changing its spatial arrangement upon irradiation with polarized electromagnetic radiation; and (b) optionally at least one grouping having form anisotropy.Type: ApplicationFiled: September 27, 2001Publication date: October 28, 2004Inventors: Horst Berneth, Thomas Bieringer, Rainer Hagen, Serguei Kostromine
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Patent number: 6808782Abstract: An optical information recording medium including a substrate having a groove that has a track pitch of 200 to 400 nm and a depth of 10 to 150 nm, the substrate having successively disposed thereon a light-reflective layer, a recording layer and a cover layer, wherein information is recordable and reproducible by irradiating a laser beam having a wavelength of 500 nm or less from a side of the medium disposed with the cover layer, and the light-reflective layer contains aluminum or an aluminum alloy.Type: GrantFiled: March 7, 2003Date of Patent: October 26, 2004Assignee: Fuji Photo Film Co., Ltd.Inventors: Yoshihisa Usami, Toshio Ishida
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Patent number: 6808778Abstract: An optical recording medium is provided with a recording layer and a reflecting film on an optically transparent substrate. The principal component of the recording layer is a dye. Virtual recording cells are assumed within grooves on the recording layer and recording marks with five different levels or more of increasing size are formed on each of the virtual recording cells by modulating the irradiation time of the laser beam in five levels or more in correspondence to the information to be recorded. The reflectance of the virtual recording cells modulates in many levels and the reflection level of the reading laser beam during regeneration is changed in five levels or more. The optically transparent substrate is made of a plastic with a glass transition point (Tg) of 160° C. or less. The reflecting film is a metal with a coefficient of thermal conductivity of 300 k/W·m−1·K−1 or more and a film thickness of 50 nm or more.Type: GrantFiled: July 3, 2001Date of Patent: October 26, 2004Assignee: TDK CorporationInventors: Hiroyuki Arioka, Hideki Sunohara
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Patent number: 6800347Abstract: A high-density optical information recording medium comprising, on a substrate, a recording layer capable of recording information by irradiation of a laser beam at a wavelength of from 380 to 500 nm, wherein the recording layer contains a compound represented by the following general formula (I): where R1 to R6 each represents, independently, a substituent, M represents a metal atom, and n represents an integer of 1 or greater.Type: GrantFiled: March 10, 2003Date of Patent: October 5, 2004Assignee: Fuji Photo Film Co., Ltd.Inventors: Toshio Ishida, Naoki Saito
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Patent number: 6761952Abstract: This invention provides imin complex dyes for a high-density optical disc recording medium having the following formula (I): wherein Y constitutes oxygen atom, sulfate atom, carbon atom with substitutes (C—R5) or nitrogen atom with substitutes (N—R6); R1 constitutes alkyl group having carbon number one to eighteen with or without substitutes or ether group, p-alkyl benzyl group with or without substitutes; R2, R3, R5, R6, R7 can be same or different groups; and X constitutes halogen atom, ClO4−, BF4−, PF6−, SbF6−, TCNQ−, TCNE−, naphthalenesulfonic acid or organometallic complex.x. The bis-styryl dyes whose spectra maximum absorption in visible light range of wavelength of 300 nm˜800 nm can be used as a high density optical disc recording medium.Type: GrantFiled: June 9, 2003Date of Patent: July 13, 2004Assignee: Industrial Technology Research InstituteInventors: Ming-Chia Lee, Wen-Yih Liao, Chien-Liang Huang, Chuen-Fuw Yan, Tzuan-Ren Jeng, Ching-Yu Hsieh, Shin-Shin Wang, Hui-Ping Tsai, Chii-Chang Lai, Jie-Hwa Ma, Jong-Lieh Yang
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Patent number: 6743567Abstract: The present invention relates to a polymer for data storage that is sensitive to a light source, a data storage media coated by the same, and a data storage device and method using the data storage media. In particular, the present invention relates to a polymer for data storage comprising two of the functional group of disperse red 1, which is a photoresponsive organic dye, bonded to a branched chain per every repeat unit, a data storage media coated by the same, a reversible and optical data storage device containing a thin film, and a data storage method using the device.Type: GrantFiled: April 12, 2001Date of Patent: June 1, 2004Assignee: LG Electronics Inc.Inventors: Yang Kyoo Han, Bong Cheol Kim, Bong Soo Ko, Jin Hong Kim, Hai Sub Na, Ki Myung Hong
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Patent number: 6743494Abstract: In addition to a cationic dye and at least one substance which functions as a quenching agent, the inventive recording medium contains a stabiliser in order to increase the stability of the optical data storage device, which has a recording layer consisting of such a recording medium. The stabiliser is a phenol with one or more hydroxy groups, which is advantageously present in the recording medium in the form of a phenolate ion and which forms part of the anions for the dye cations. In addition, the recording medium can also contain an anionic, metallo-organic thiolene complex, which replaces a usual quencher and forms another part of the anions for the dye cations.Type: GrantFiled: February 4, 2002Date of Patent: June 1, 2004Assignee: Interaxia AGInventors: Atanas Zafirov, Slavtcho Rakovski, Jana Bakardjieva-Eneva
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Patent number: 6737143Abstract: An optical recording medium having a substrate and at least a recording layer disposed on the substrate, the recording layer comprising at least one squarylium metal chelate compound which comprises a squarylium compound and a metal; and at least one azo metal chelate compound which comprises another metal and an azo compound expressed by the following formula (A-I): where A and B each independently expresses a residue forming one of a) a heterocyclic ring which may comprise a substituent and b) aromatic ring which may comprise a substituent, by combination with corresponding carbon atoms respectively bonded to A or B, and X expresses an active-hydrogen-containing substituent group. An optical recording method, and optical recording device using the same optical recording medium.Type: GrantFiled: June 11, 2002Date of Patent: May 18, 2004Assignee: Ricoh Company Ltd.Inventors: Soh Noguchi, Tsutomu Sato, Tatsuya Tomura, Yasunobu Ueno, Ikuo Shimizu, Motoharu Kinugasa, Hiroshi Toyoda, Shiho Yamada
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Publication number: 20040072100Abstract: Disclosed is an optical recording medium, comprising a polymer alloy forming a phase-separated domain structure of a coating object, and a volatile substance interacting with the polymer alloy. The volatile substance in a vapor state is deposited on the surface of specific phase-separated domain, and dispersedly infiltrated into the phase-separated domain. The phase-separated domain and the volatile substance chemically interact with each other. The optical recording medium is operable to perform optical recording by utilizing change in the transmittance, reflectance, refractive index or surface potential thereof in response to irradiation of ultraviolet light, visible light, or infrared light from outside. The present invention can provide an optical recording medium suitable for high-density recording in a wide wavelength range.Type: ApplicationFiled: September 4, 2003Publication date: April 15, 2004Inventors: Toshiko Mizokuro, Takashi Hiraga, Noritaka Yamamoto, Hiroyuki Mochizuki, Shin Horiuchi, Norio Tanaka
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Patent number: 6713147Abstract: An information-recording medium comprising a substrate having thereon a recording layer capable of recording information with laser light, said recording layer containing: at least one compound selected from the group consisting of compounds represented by the following general formulae (I-1), (I-2), (I-3) and (I-4); and an organic dye other than said compounds. The symbols in the above formulae are defined in the specification.Type: GrantFiled: February 20, 2002Date of Patent: March 30, 2004Assignee: Fuji Photo Film Co., Ltd.Inventors: Shinnichi Morishima, Michihiro Shibata
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Publication number: 20040042379Abstract: The invention refers to an optical storage medium from which information can be read out and/or into which information can be recorded with a light beam (6), said optical storage medium comprising one or more base members (1) bearing on the side of the base members (1) on which the light beam (6) is incident, one or more information storage layers (3), at least one light-transmissive cover film (5) and one or more light-transmissive adhesive layers (4) bonding said cover films (5) to each other, to the surface (2) of the base members (1) on which the light beam (6) is incident and/or to one or more information storage layers (3), at least one of said adhesive layers being obtained by applying a curable liquid precursor of said adhesive with subsequent curing, said cover films (5) exhibiting a vertical birefringence of less than 0.001 at 20° C. at least at the wavelength or wavelength spectrum, respectively, of said light beam (6).Type: ApplicationFiled: March 27, 2003Publication date: March 4, 2004Inventor: Wolfgang G Schoeppel
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Publication number: 20040043326Abstract: An optical information recording medium has a recording layer composed essentially of an oxonol compound of the following formula: 1Type: ApplicationFiled: June 6, 2003Publication date: March 4, 2004Applicant: FUJI PHOTO FILM CO. , LTD.Inventors: Naoki Saito, Koji Wariishi, Michihiro Shibata
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Patent number: 6699556Abstract: An optical information recording medium having, on a substrate, a recording layer capable of recording information by irradiation with laser rays. The recording layer includes a 1,2,3-triazole compound that is not a condensate with 1,3-dimethylbarbituric acid. Also, an information recording method in which such an optical information recording medium is irradiated with a laser having a wavelength of 550 nm or less to record information.Type: GrantFiled: September 26, 2001Date of Patent: March 2, 2004Assignee: Fuji Photo Film Co., Ltd.Inventor: Naoki Saito
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Patent number: 6699557Abstract: An optical recording medium (10) is adapted such that information is recorded by forming recording marks on a recording layer (12) that covers grooves (16) of an optical transparent substrate (14). In the recording layer (16), contiguously defined along a feed direction S of irradiation are virtual recording cells (40) which have a given unit length in the feed direction S of irradiation along the groove 16 and a given unit width in the direction orthogonal thereto. In addition, the groove width W is set so that 0.20×(&lgr;/NA)<W<0.50×(&lgr;/NA), where &lgr; is the wavelength of a laser beam to be irradiated with and NA is the numerical aperture of the objective lens for the laser beam in a irradiation optical system. The irradiation time is set in five stages or more to radiate the laser beam, thereby making it possible to record information in multi-levels.Type: GrantFiled: March 28, 2002Date of Patent: March 2, 2004Assignee: TDK CorporationInventors: Hiroyuki Arioka, Syuji Tsukamoto, Takashi Horai, Shirou Ootsuki
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Publication number: 20040038146Abstract: An optical recording material which when exposed to actinic radiation produces a change in optical properties in the exposed regions, thereby providing a pattern of intelligence for storing and retrieving information, the recording material having: a) a polymer containing a covalently bound reactant moiety which is capable of undergoing a chemical transformation upon a one electron oxidation, thus causing the change in optical properties in the exposed regions; and b) a sensitizer capable of absorbing actinic radiation to cause an initial one electron oxidation of the reactant.Type: ApplicationFiled: August 19, 2002Publication date: February 26, 2004Applicant: Eastman Kodak CompanyInventors: Douglas R. Robello, Samir Y. Farid, Joseph P. Dinnicenzo, Jason G. Gillmore
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Publication number: 20040022165Abstract: The present invention is directed to a three-dimensional memory apparatus for storing information in a volume comprising of an active medium. The active medium is capable of changing from a first to a second isomeric form as a response to radiation of a light beam having an energy substantially equal to a first threshold energy. The concentration ratio between a first and a second isomeric form in any given volume portion represents a data unit. The active medium in the memory apparatus comprises of diarylalkene derivatives, triene derivatives, polyene derivatives or a mixture thereof. The invention is further directed to means for reading the data units from the isomeric states of the active medium in different portions of said active medium where the two isomeric forms have a substantially different absorption coefficient for absorbing energy of a second threshold energy. Reading may also be carried out by measuring the scattering pattern of the two isomeric forms.Type: ApplicationFiled: June 12, 2003Publication date: February 5, 2004Inventor: Ortal Alpert
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Patent number: 6682799Abstract: A dye-in-polymer composition for in fluorescent WORM discs comprises about 0.1 to 10% by weight of a fluorescent dye capable of absorbing laser radiation and transforming the absorbed light into heat; about 10 to 80% by weight of nitrocellulose and a film forming polymer. The dye containing solution is applied to substrate of an optical reading medium by a spin, roller or dip coating. The method utilizes a focused laser beam for scanning the recording layer.Type: GrantFiled: April 20, 2001Date of Patent: January 27, 2004Assignee: Valdas Ltd. (A British Virgin Island Corp.)Inventors: Mark Alperovich, Irene Zuhl, Eugene Levich, Arkady Khaikin
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Publication number: 20040013976Abstract: The present invention relates to an active energy ray curable composition for coating optical disc, comprising a urethane (meth)acrylate compound having at least one amide group in the molecule, an ethylenically unsaturated compound other than the urethane (meth)acrylate compound and a photopolymerization initiator; and an optical disc having a cured coating layer obtained by curing the composition.Type: ApplicationFiled: May 30, 2003Publication date: January 22, 2004Inventors: Juichi Fujimoto, Kouji Hayama, Seiji Nushi, Hiroshi Fukushima
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Patent number: 6673411Abstract: A recordable optical recording medium comprising a recording layer containing an organic dye which can absorb a laser beam and a metal reflective layer directly or via another layer on a transparent supporting substrate having a pre-groove and a pre-pit, wherein the organic dye has a refractive index nk of 2.2 or more at a reproduction wavelength &lgr;2; in relation to the reproduction wavelength &lgr;2, the depths of the pre-groove and the pre-pit on the substrates are more than &lgr;2/4; and the following equations are satisfied: 0.25r≦wg≦0.38r; 0.25≦wp/wg≦0.Type: GrantFiled: June 24, 2002Date of Patent: January 6, 2004Assignee: Mitsui Chemicals, Inc.Inventors: Akihiro Koide, Yuji Inatomi, Tadashi Koike
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Publication number: 20040002008Abstract: Holographic data storage media having a sandwiched construction are described in which a holographic recording material is sandwiched between two substrates. A variety of different formulations of the holographic recording material are also described. By improving the formulation of the photosensitive material, holographic media can be improved.Type: ApplicationFiled: June 27, 2002Publication date: January 1, 2004Applicant: Imation Corp.Inventors: Ramon F. Hegel, Stanley C. Busman
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Publication number: 20030235783Abstract: A method for fabricating an optical recording medium is provided. A dye layer is formed on a molded substrate by spin-coating. A reflection layer is formed on the dye layer by sputtering so that the optical disc has enough reflection rate.Type: ApplicationFiled: October 3, 2002Publication date: December 25, 2003Inventors: Wen-Dar Liu, Nae-Jen Wang, Wan-Chun Chen, Biing-Hwang Lin, Hui-Jen Chen, Hsin-Te Kuo
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Patent number: 6660867Abstract: An object of the present invention is to provide a material having spectroscopic properties, light resistance, solubility and thermal decomposition properties suitable for recording for DVD-R. More specifically, the present invention provides squarylium compounds in a state of a metal complex represented by the general formula (I): wherein, R1 and R2 are the same or different, and represent an alkyl group optionally having a substituent, an aralkyl group optionally;,having a substituent, an aryl group optionally having a substituent, or a heterocyclic group optionally having a substituent; Q represents a metal atom with a coordination ability; q represents 2 or 3; and A represents an aryl group optionally having a substituent, a heterocyclic group optionally having a substituent, or Y═CH— wherein Y represents an aryl group optionally having a substituent or a heterocyclic group optionally having a substituent.Type: GrantFiled: November 27, 2002Date of Patent: December 9, 2003Assignees: Kyowa Hakko Kogyo Co., Ltd., Kyowa Yuka Co., Ltd., Ricoh Company, Ltd.Inventors: Ikuo Shimizu, Hiroshi Toyoda, Motoharu Kinugasa, Shiho Yamada, Soh Noguchi, Tsutomu Satoh, Tatsuya Tomura
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Publication number: 20030224250Abstract: A novel liquid photoreactive asymmetric acrylate compound containing sulfur, aromatic moieties, and optionally bromine, and having high dynamic range sensitivity is disclosed. The acrylate compound is a monomer for a photoimageable system. In one embodiment, when about 2-8% by weight of the acrylate compound is dissolved in a two-component urethane matrix system and incorporated in an optical article formed by reacting the two-component urethane matrix system, the optical article shows a sensitivity of about 4 or more and a shrinkage during the formation of the optical article of about 0.05% versus a sensitivity of 2.26 and a shrinkage of 0.13% when tribromophenyl acrylate, a commercial monomer, was used.Type: ApplicationFiled: May 29, 2003Publication date: December 4, 2003Inventors: Songvit Setthachayanon, Xuan T. Phan, Mark David Michaels, Benjamin C. Ihas
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Publication number: 20030224293Abstract: An optical recording medium comprising a substrate having formed thereon a thin film comprising an organic compound dye that can form pits when irradiated with a semiconductor laser beam and a compound represented by formula (I) as a recording layer: 1Type: ApplicationFiled: February 19, 2003Publication date: December 4, 2003Applicant: ASAHI DENKA KOGYO KABUSHIKI KAISHAInventors: Keiji Oya, Atsurou Tomita, Toru Yano
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Patent number: 6645594Abstract: The present invention provides organic compounds which improve the light resistance of organic dye compounds without substantially deteriorating their preferable light properties when applied to them, and have satisfactory solubility in organic solvents and compatibility with organic dye compounds.Type: GrantFiled: February 8, 2001Date of Patent: November 11, 2003Assignee: Kabushiki Kaisha Hayashibara Seibutsu Kagaku KenkyujoInventors: Kentaro Yano, Katsumi Orita, Toshio Kawata, Shigeo Yasui
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Publication number: 20030207206Abstract: A limited play optical storage medium for data is provided that comprises a first optically transparent substrate; a reflective layer; a data layer disposed between said first substrate and said reflective layer; a second substrate; and a reactive layer comprising a carrier and a reactive material wherein the reactive layer and reflective layer are disposed between said first substrate and said second substrate.Type: ApplicationFiled: March 10, 2003Publication date: November 6, 2003Applicant: General Electric CompanyInventors: Daniel Robert Olson, Marc Brian Wisnudel, Eelco M.S. van Hamersveld
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Publication number: 20030202458Abstract: The invention discloses new benzoindole styryl compounds and its use for a high-density optical recording medium. The invention uses the dyes of the new benzoindole styryl compounds to form the recording layer of high-density recording media. The new benzoindole styryl compounds are easy to prepare and purify, so they are cheaper when comparing to the compounds generally used in high-density optical recording media. The benzoindole styryl compounds has a maximum absorption for the light wavelength in the range of 500 nanometers to 700 nanometers. The benzoindole styryl compounds also have high sensitivity and chemical stability for light and heat. Using the new benzoindole styryl compounds to form a high-density optical recording medium can match up with the short-wavelength laser beam for high-density optical recording media and have the advantage of a stable quality.Type: ApplicationFiled: September 13, 2002Publication date: October 30, 2003Inventors: Shin-Shin Wang, Wen-Yih Liao, Chii-Chang Lai, Chien-Liang Huang, Hui-Ping Tsai, Chuen-Fuw Yan, Jong-Lieh Yang, Tzuan-Ren Jeng, Ming-Chia Lee
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Publication number: 20030198892Abstract: A limited play optical storage medium for data is provided which comprises a first optically transparent substrate; a reflective layer; a data layer disposed between said substrate and said reflective layer; a reactive layer that optionally comprises a polyhydroxy compound, at least one carrier, and at least one reactive material; and a second substrate wherein the second substrate is optionally a light-absorbing layer with the proviso that the storage medium includes a reactive layer with a polyhydroxy compound, a light-absorbing layer, or a combination thereof.Type: ApplicationFiled: March 18, 2003Publication date: October 23, 2003Applicant: General Electric CompanyInventors: Karin Ann Ezbiansky, Daniel Robert Olson, Philippe Schottland, Larry Takiff, Verghese Thomas, Marc Brian Wisnudel
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Publication number: 20030190552Abstract: The present invention provides an optical recording medium containing a phthalocyanine compound in its recording layer and, particularly, a CD-R in which the color of the disk as viewed from the substrate side disappears apparently as if the colorant-containing recording layer were not present Disclosed is an optical recording medium produced by laminating a recording layer, a reflecting layer and a protective layer on the transparent substrate, the recording layer comprising a phthalocyanine compound and a reddish colorant.Type: ApplicationFiled: March 31, 2003Publication date: October 9, 2003Applicant: TOYO INK MANUFACTURING CO., LTD.Inventors: Tetsuya Kaneko, Kazuhiro Ishikawa, Makoto Sakamoto
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Publication number: 20030183959Abstract: The invention relates to block copolymers for optical data storage.Type: ApplicationFiled: April 8, 2003Publication date: October 2, 2003Inventors: Horst Berneth, Thomas Bieringer, Rainer Hagen, Serguei Kostromine, Hans-Werner Schmidt, Axel Muller, Stephan Zilker, Carsten Frenz, Thomas Breiner
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Patent number: 6627288Abstract: A recordable optical recording medium of this invention capable of good recording and reproduction with a laser at wavelengths of 300 to 500 nm and/or 500 to 700 nm comprises at least one porphycene compounds optionally chelated with a metal in its recording layer.Type: GrantFiled: August 2, 2001Date of Patent: September 30, 2003Assignees: Mitsui Chemicals, Inc., Yamamoto Chemicals, Inc.Inventors: Akira Ogiso, Shinobu Inoue, Hisashi Tsukahara, Taizo Nishimoto, Tsutami Misawa, Tadashi Koike
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Publication number: 20030179277Abstract: A data carrier (1) with a storage layer (2) which has a dye that can be changed by exposure to light is used for the storage of microimages by means of a write beam of a writing device.Type: ApplicationFiled: May 9, 2003Publication date: September 25, 2003Inventors: Stefan Stadler, Jorn Leiber
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Publication number: 20030175618Abstract: An ultraviolet curable composition is prepared by using a maleimide compound itself having a photopolymerization initiating function, as a main component, in combination with various acrylate compounds as a subsidiary component, and a light transmitting layer is formed from the ultraviolet curable composition. In an information storage medium comprising at least a reflection film, an information storage layer and a light transmitting layer made of the ultraviolet curable composition formed on a substrate, when using laser light having an emission wavelength of 370 to 430 nm as an irradiation light source, recording or playback of information is conducted at high storage density.Type: ApplicationFiled: March 19, 2003Publication date: September 18, 2003Inventors: Koichi Fujii, Kazuo Murakami
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Patent number: 6599605Abstract: An object of the present invention is to provide novel squarylium compounds having the spectroscopic properties, light resistance, solubility and thermal decomposition properties suitable for a recording material for DVD-R, and optical recording media using the same. More particularly, the present invention provides novel squarylium compounds represented by the general formula (I). In addition, the present invention provides optical recording media having a recording layer containing said squarylium compound.Type: GrantFiled: November 28, 2001Date of Patent: July 29, 2003Assignees: Kyowa Hakko Kogyo Co., Ltd., Kyowa Yuka Co., Ltd., Ricoh Company, Ltd.Inventors: Ikuo Shimizu, Hiroshi Toyoda, Motoharu Kinugasa, Shiho Yamada, Masanori Ikuta, Kenji Mutoh, Tsutomu Satoh, Tatsuya Tomura
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Patent number: 6596364Abstract: Squarylium compounds having spectroscopic properties, light resistance, solubility and thermal decomposition properties suitable for a recording material for DVD-R represented by the general formula (I), having pyrazole and indoline skeletons in the molecule and optical recording media having a recording layer comprising an asymmetric squarylium compound of formula (I).Type: GrantFiled: December 5, 2001Date of Patent: July 22, 2003Assignees: Kyowa Hakko Kogyo Co., Ltd., Kyowa Yuka Co., Ltd., Ricoh Company, Ltd.Inventors: Ikuo Shimizu, Hiroshi Toyoda, Motoharu Kinugasa, Shiho Yamada, Masanori Ikuta, Kenji Mutoh, Tsutomu Satoh, Tatsuya Tomura
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Publication number: 20030113664Abstract: Polymeric material suitable for the preparation of optical recording media for binary and/or multibit and/or volume data storage is disclosed. The molecular structure of the material contains a main chain and side chains.Type: ApplicationFiled: September 23, 2002Publication date: June 19, 2003Inventors: Horst Berneth, Thomas Bieringer, Rainer Hagen, Serguei Kostromine
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Patent number: 6576321Abstract: An optical recording medium comprising a recording and a metal reflective layers on a transparent substrate having a groove, wherein the recording layer comprises an azaporphyrin metal complex dye with 1 to 4 meso-nitrogen atoms as a main component; recording and/or reproduction can be conducted using laser beams with wavelengths of &lgr;1 and &lgr;2 which is shorter than &lgr;1; a refractive index n of the recording layer is 2.0 or more at &lgr;1 and 1.8 or more at &lgr;2 as well as an attenuation coefficient k of the layer is 0.04 to 0.20 at &lgr;1 and 0.30 or less at &lgr;2; and the groove has a pitch of 0.70 to 0.85 &mgr;m, a half-value width of 0.20 to 0.Type: GrantFiled: September 19, 2001Date of Patent: June 10, 2003Assignee: Mitsui Chemicals, Inc.Inventors: Norihiko Mihara, Tadashi Koike
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Publication number: 20030103443Abstract: An optical information recording medium including a substrate having succesively disposed thereon a recording layer and a cover layer, wherein information is recorded and reproduced by irradiating a laser beam having a wavelength of 380 to 500 nm through a lens having a numerical aperture NA of at least 0.7 and the recording layer contains an organic substance and has an attenuation coefficient k of more than 0.3.Type: ApplicationFiled: November 27, 2002Publication date: June 5, 2003Applicant: FUJI PHOTO FILM CO., LTD.Inventors: Toshio Ishida, Takeshi Kakuta, Shinji Saito
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Patent number: 6572947Abstract: To provide a high density optical recording medium, capable of realizing the complete compatibility with a phase change recording medium with respect to an optical pickup or a drive device, using a short wavelength light for achieving a high recording density. The present invention provides an optical recording medium configuration for directly reading out the change of the reflectance without using the phase modulation method. An optical recording medium according to the present invention is an optical recording medium having a recording film of a single layer or multiple layer structure on a substrate (1), wherein the recording film is mainly made of an organic substance material layer (2) for absorbing and decomposing a laser beam, and generating the refractive index change as well as the reflectance of the optical recording medium with respect to a reproduction laser beam of a 380 nm to 450 nm wavelength is 15% to 25% before the decomposition, and 0% to 10% after the decomposition.Type: GrantFiled: March 23, 2001Date of Patent: June 3, 2003Assignee: Sony CorporationInventors: Yuichi Sabi, Hidetoshi Watanabe, Masanobu Yamamoto
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Patent number: 6565939Abstract: A heat mode optical information-recording medium comprising a substrate having thereon a recording layer on which information can be recorded by laser irradiation, wherein said recording layer contains a cyanine dye compound represented by the following general formula (I): wherein DYE+ represents a monovalent cyanine dye cation; n represents an integer of 1 or more; R5 and R6 each independently represents a substituent group; R7 and R8 each independently represents an alkyl group, an alkenyl group, an alkynyl group, an aralkyl group, an aryl group or a heterocyclic group; R5 and R6, R5 and R7, R6 and R8 or R7 and R8 may be connected to each other to form a ring; and r and s each independently represents an integer of from 0 to 4 and when r or s is 2 or more, a plurality of R5 groups and a plurality of R6 groups may, respectively, be the same or different from each other.Type: GrantFiled: April 3, 2001Date of Patent: May 20, 2003Assignee: Fuji Photo Film Co., Ltd.Inventors: Yoshio Inagaki, Naoki Saito
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Patent number: 6558768Abstract: An optical recording medium has a substrate and a recording layer formed thereon, the recording layer containing at least one squarylium compound and one azo metal chelate compound including an azo moiety of formula (I-1) or (I-2) and a metal: wherein A, B, A′, and X are the same as those previously defined in the specification. Writing and reading steps are performed by the application of a semiconductor laser beam with a wavelength in a range from 600 to 720 nm.Type: GrantFiled: March 2, 2001Date of Patent: May 6, 2003Assignees: Ricoh Company, Ltd., Kyowa Hakko Kogyo Co., Ltd., Kyowa Yuka Co., Ltd.Inventors: Soh Noguchi, Tsutomu Satoh, Tatsuya Tomura, Noboru Sasa, Yasunobu Ueno, Yasuhiro Higashi, Ikuo Shimizu, Hiroshi Toyoda, Motoharu Kinugasa, Shiho Yamada, Masanori Ikuta, Kenji Mutoh
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Patent number: 6551682Abstract: There is provided a metal-containing azo compound suitably used for an recording layer of an optical medium, which is represented by at least one of the following general formulae: wherein M(II) is a bivalent metal, X1 and X2 are each a residue that forms a monocyclic or polycyclic aromatic ring, Y1 and Y2 are each a residue that forms a nitrogen-containing aromatic heterocycle, and one residue is different from the other in at least one of a combination of X1 and X2, and a combination of Y1 and Y2; and there is also provided an optical recording medium of which recording layer comprises said metal-containing azo compound.Type: GrantFiled: September 14, 2001Date of Patent: April 22, 2003Assignees: Matsushita Electric Industrial Co., Ltd., Yamada Chemical Co., Ltd.Inventors: Yoshihiro Tosaki, Tomiharu Hosaka, Toshiaki Kunieda, Masatoshi Taniguchi, Noriko Kobayashi, Tomoyuki Hase
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Patent number: 6541092Abstract: An optical information storage medium having small jitter value and high recording sensitivity. The optical information storage medium has a transparent pregrooved substrate having thereon a dye recording layer, in which information can be recorded by irradiation with a laser, and a light-reflective layer on the dye recording layer, which is made of a metal. The dye recording layer contains a dye A, which has a maximum absorption wavelength in a 400 to 700 nm range, and a dye B, which has a maximum absorption wavelength 3 to 50 nm longer than that of the dye A. A sensitivity ratio Q between the dye A and the dye B, which is represented by the following equation, is from 0.20 to 0.55: Q=(PA−PB)/PA where PA represents optimum recording power for the dye A and PB represents optimum recording power for the dye B.Type: GrantFiled: August 17, 2001Date of Patent: April 1, 2003Assignee: Fuji Photo Film Co., Ltd.Inventors: Michihiro Shibata, Shinichi Morishima
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Publication number: 20030049549Abstract: The present invention relates to a method by which items of digital information can be stored repeatedly by light induction in a two-dimensional medium and erased again, the items of information being optically readable.Type: ApplicationFiled: August 15, 2002Publication date: March 13, 2003Inventors: Rainer Hagen, Thomas Bieringer, Serguei Kostromine, Horst Berneth
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Patent number: 6521317Abstract: The present invention enables to realize a high recording density while suppressing the wobble signal jitter component to a sufficiently low value for practical use, thereby enabling to perform information recording/reproducing in a stable manner. The recording track has a track pitch set to 1.3 micrometers or below and the recording layer is formed by a recording material containing a dye having a characteristic appropriate to suppress the wobble signal jitter component to a low value.Type: GrantFiled: February 9, 2001Date of Patent: February 18, 2003Assignee: Sony CorporationInventors: Toshihiro Akimori, Sohmei Endoh, Manabu Satoh
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Patent number: 6503593Abstract: Optical disc, e.g., CD-R, DVD, DVD-R, comprising a polymer substrate and a radiation-cured coating provided by curing a radiation-curable coating composition having a pH greater than or equal to 3 and comprising at least one acrylate monomer, and advantageously diacrylate monomers and oligomers and monomers having acrylate functionalities of from 1 to at least 3, wherein the optical disc exhibits jitter of no greater than about 35 ns after being subjected to an environment having a temperature of at least 80° C. and a relative humidity of at least 85% for a period of at least 96 hours.Type: GrantFiled: April 10, 2001Date of Patent: January 7, 2003Assignee: DSM N.V.Inventors: Christopher F. Tronche, Chau T. Ha