Radiation Beam Modified Or Controlling (e.g., Photosensitve, Optical Track) Patents (Class 369/284)
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Publication number: 20080159120Abstract: A controller of an optical disk device includes: a first sub-controller, a second sub-controller and a third sub-controller. The first sub-controller includes serially connected a first lead-lag filter and a first low pass filter. The second sub-controller includes a second lead-lag filter and a second low pass filter that are serially connected. The third sub-controller includes serially connected a second lead-lag filter, a third low pass filter, and an fourth lead-lag filter.Type: ApplicationFiled: December 20, 2007Publication date: July 3, 2008Inventor: Yu-Cheng Ko
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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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Publication number: 20080123479Abstract: An apparatus for recording/reproducing holographic data which can record holographic data in a data storage medium and can reproduce recorded data includes a light source emitting a laser beam, a lens unit focusing the laser beam emitted from the light source by classifying the laser beam into a reference beam passing through a first area and a signal beam passing through a second area and having a first lens focusing the signal beam to a first focus and a second lens focusing the reference beam to a second focus, and a driving unit driving the first lens to vary the first focus in a depth direction of the data storage medium.Type: ApplicationFiled: May 17, 2007Publication date: May 29, 2008Applicant: Samsung Electronics Co., Ltd.Inventor: Ji-deog Kim
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Patent number: 7378220Abstract: An optical information recording medium includes a substrate having disposed thereon a recording layer that is recordable by irradiating the recording layer with a laser having a wavelength of 450 nm or less. The recording layer contains a specific phthalocyanine derivative. An optical information recording method uses the medium.Type: GrantFiled: June 27, 2002Date of Patent: May 27, 2008Assignee: FUJIFILM CorporationInventor: Naoki Saito
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Patent number: 7358031Abstract: A multilayer optical information recording medium includes optical information recording layers, and dielectric multilayer reflecting layers provided under the optical information recording layers respectively. Each of the dielectric multilayer reflecting layers includes: a laminate of low refractive index films and high refractive index films; and a variable refractive index film exhibiting change of refractive index induced by laser beam irradiation. Each of the dielectric multilayer reflecting layers is provided so that reflectance of a portion used for reading/writing information by condensed laser beam irradiation is high while transmittance of the other portion is high. It is possible to reduce intensity of laser beam to be irradiated to the medium.Type: GrantFiled: March 19, 2004Date of Patent: April 15, 2008Assignee: Hitachi, Ltd.Inventors: Hiroki Yamamoto, Takashi Naito, Toshimichi Shintani
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Patent number: 7359306Abstract: Provided is a holographic recording medium including a recording layer in which information is to be holographically recorded, and a light-shielding layer which faces a main surface of the recording layer. The transmittance of the light-shielding layer for a recording light is increased on increasing intensity of the recording light. Alternatively, the light-shielding layer selectively transmits the recording light.Type: GrantFiled: February 9, 2004Date of Patent: April 15, 2008Assignee: Kabushiki Kaisha ToshibaInventors: Kazuki Matsumoto, Katsutaro Ichihara, Akiko Hirao, Hideyuki Nishizawa
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Patent number: 7352686Abstract: A data storage device comprises a first substrate and a second substrate, wherein at least the first substrate has defined thereon a plurality of pits and lands covered by a reflective material; and a bonding layer between the first and second substrates including a reactive agent that interferes with the passage of light in response to predetermined stimulus. In another embodiment, an optically-readable storage media, comprises a substrate having encoded data stored thereon, a reactive agent that, in response to predetermined stimulus, interferes with the passage of light of a predetermined frequency range, and a second reactive agent that, in response to predetermined stimulus, degrades the readability of the encoded data.Type: GrantFiled: June 5, 2006Date of Patent: April 1, 2008Assignee: Flexplay Technologies, Inc.Inventors: Robert F. Thompson, Yannis Bakos, Joseph W. Paulus, Arthur R. LeBlanc, III
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Patent number: 7348124Abstract: A high-density readable only optical disk with a large storage capacity includes a substrate with pits, and one or more mask layers with a super resolution near field structure, which are made of a mixture of a dielectric material and metal particles. The optical disk can be obtained without decreasing the wavelength of a laser diode or increasing the numerical aperture of an objective lens.Type: GrantFiled: September 29, 2003Date of Patent: March 25, 2008Assignee: Samsung Electronics Co., Ltd.Inventors: In-oh Hwang, In-sik Park
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Patent number: 7348125Abstract: Disclosed is an optical information recording medium comprising a substrate having provided thereon a recording layer capable of recording information by laser beam irradiation, wherein the recording layer contains at least one compound represented by the following general formula (I): The symbols in the formula (I) are defined in the specification. Also disclosed is a method for recording optical information using the optical information recording medium.Type: GrantFiled: July 25, 2002Date of Patent: March 25, 2008Assignee: FUJIFILM CorporationInventors: Shinnichi Morishima, Michihiro Shibata
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Publication number: 20080031116Abstract: A recording method of an information recording medium includes: (a) storing management information; (b) reading out the management information; and (c) recording. The information recording medium has two recording layers. A first recording layer is placed nearer to a source of a laser and a recording direction thereof is from the inner side to the outer side of the information recording medium. A recording direction of a second recording layer is from the outer side to the inner side. In the (a) storing, management information indicating a recording status of the information recording medium is recorded in a management information area of the information recording medium. In (b) reading out, the management information is read out from the management information area. In (c) recording, recording processing is performed by skipping a part of an area based on the management information.Type: ApplicationFiled: August 2, 2007Publication date: February 7, 2008Inventors: Masatsugu Ogawa, Yutaka Yamanaka, Shuichi Ohkubo
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Patent number: 7328447Abstract: An optical recording medium having a plural number of recording layers includes a n-th recording layer (23) (n?1), made up by a substrate (20) and a semi-reflective layer (21) carried by the substrate (20) and adapted for partially reflecting and partially transmitting the incident light, a (n+1)th recording layer (28), made up by another substrate (25) and a reflecting layer (26) carried by the substrate (25) and adapted for reflecting the incident light, and a light condensing layer (24) for condensing the light incident via the n-th recording layer (23) on the (n+1)th recording layer (28).Type: GrantFiled: April 28, 2003Date of Patent: February 5, 2008Assignee: Sony CorporationInventors: Tetsujiro Kondo, Norifumi Yoshiwara
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Patent number: 7298682Abstract: It is an object of the present invention to provide an information recording method for recording information in a data rewritable type optical recording medium having a plurality of information recording layers, which can form recording marks having good shapes. In the information recording method according to the present invention, information is recorded in an optical recording medium 10 having at least a stacked L0 layer 20 and L1 layer 30 by projecting a laser beam whose power is modulated thereonto via a light incidence plane 13a. When information is recorded, ?/NA is set to be equal to or shorter than 700 nm, where ? is the wavelength of the laser beam and NA is the numerical aperture of an objective lens for converging the laser beam, and a pulse width Ttop0 of a top pulse of the laser beam when information is to be recorded in the L0 layer 20 is set to be shorter than a pulse width Ttop1 of a top pulse of the laser beam when information is to be recorded in the L1 layer 30.Type: GrantFiled: February 14, 2003Date of Patent: November 20, 2007Assignee: TDK CorporationInventors: Hideaki Miura, Tatsuya Kato, Tetsuro Mizushima
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Publication number: 20070253318Abstract: An optical recording medium includes a substrate having phase pits, a reflective layer that reflects a light beam emitted to the substrate and the phase pits, and a reflectivity reducing layer that reduces the reflectivity of the reflective layer on a light-incident side of the reflective layer. A dielectric layer is formed as the reflectivity reducing layer so that a refractive index varies. In another variation, a metal layer is used as the reflectivity reducing layer, which is formed of a metal film with a higher refractive index than that of the reflective layer.Type: ApplicationFiled: July 28, 2006Publication date: November 1, 2007Inventors: Tetsuo Hosokawa, Akio Okamuro
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Patent number: 7276274Abstract: An optical recording medium includes a substrate, a light transmission layer and a plurality of recording layers between the substrate and the light transmission layer and capable of recording data in the plurality of recording layers and reproducing data recorded in the plurality of recording layers by projecting a laser beam via the light transmission layer onto the plurality of recording layers, at least one recording layer other than a farthest recording layer from the light transmission layer among the plurality of recording layers including a first recording film containing Si as a primary component and a second recording film located in the vicinity of the first recording film and containing Cu as a primary component. In the thus constituted optical recording medium, it is possible to record data in a farthest recording layer from the light transmission layer and reproduce data from the farthest recording layer in a desired manner.Type: GrantFiled: July 3, 2003Date of Patent: October 2, 2007Assignee: TDK CorporationInventors: Hiroyasu Inoue, Hironori Kakiuchi, Masaki Aoshima, Koji Mishima
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Publication number: 20070202441Abstract: The present invention relates to an optical storage medium using nanoparticles, and more specifically to a multi-layer optical storage medium. According to the invention, the optical storage medium has two or more storage layers with nanoparticles, each storage layer being made of a dielectric material, wherein the dielectric materials of at least two storage layers have a different dielectric permittivity.Type: ApplicationFiled: February 20, 2007Publication date: August 30, 2007Inventor: Nicolas Richard
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Patent number: 7263057Abstract: Hardness of a resin substrate of an optical disc is selected to be greater than hardness of a cover layer of the optical disc, at least when information is recorded on the optical disc. A laser beam is transmitted to an organic dye layer of the optical disc through the cover layer and a protection layer when information is recorded on the optical disc. The organic dye layer is sandwiched by the protection layer and a reflection layer. The substrate has grooves on its surface, and information is recorded between the grooves. The organic dye is heated and expands upon information recording, but a stress generated by the deforming organic dye layer is mainly transferred toward the cover layer. Deformation of the reflection layer and crosswrite upon information recording can be prevented. Therefore, the optical disc can record information between the grooves at a high density.Type: GrantFiled: September 22, 2005Date of Patent: August 28, 2007Assignee: Pioneer CorporationInventor: Takanobu Higuchi
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Patent number: 7247417Abstract: The present invention provides an optical recording medium that includes a recording layer composed mainly of an organic compound and can utilize blue-violet semiconductor laser light (390 to 420 nm in wavelength) as recording/reproducing laser light. The present invention also provides an optical recording/reproducing method using the optical recording medium. The optical recording medium 1 comprises at least a supporting substrate 2; a recording layer 3 on the supporting substrate 2, the recording layer 3 containing an organic compound as a major component; and a light-transmitting layer 5 on the recording layer 3, the light-transmitting layer 5 being capable of transmitting laser light with a wavelength of 390 to 420 nm for recording and reproducing information.Type: GrantFiled: September 9, 2003Date of Patent: July 24, 2007Assignee: TDK CorporationInventors: Narutoshi Fukuzawa, Takashi Horai, Hiroshi Take
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Patent number: 7241555Abstract: The present invention provides an optical information recording medium including a substrate; and a recording layer provided onto the substrate, to which information can be recorded and from which the information can be replayed by irradiating the medium with a laser having a short wavelength, specifically a highly versatile semiconductor laser having a wavelength near 405 nm, wherein the recording layer includes a specific compound, and the recording medium has superior recording properties. An information recording method capable of recording information at high density using a laser having a short wavelength is also provided.Type: GrantFiled: August 5, 2003Date of Patent: July 10, 2007Assignee: Fujifilm CorporationInventors: Tetsuya Watanabe, Masaki Okazaki
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Patent number: 7226637Abstract: An information layer for an optical information storage medium is formed in a centrifuge. A photopolymerizable composition is applied to a solid base having a relief pattern, and a flexible, transparent film layer is applied on top of the composition. The three are spun in a centrifuge to cause a thin, even distribution of the photopolymerizable composition, which is photopolymerized. The resulting replica is separated from the relief pattern and has a fluorescent material applied thereto. Alternatively, the replica has a non-fluorescent material applied thereto, and the non-fluorescent material is made fluorescent through diffusion. Multiple information layers thus formed can be glued together to form a multilayer optical information storage medium.Type: GrantFiled: January 18, 2001Date of Patent: June 5, 2007Assignee: D Data Inc.Inventors: Galina Dorozhkina, Irina Kiryusheva, Eugene Levich, Alexey Lezhnev, Dmitry Pebalk
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Patent number: 7223520Abstract: The present disclosure relates to a limited play optical storage media and a method for limiting access to data thereon. This storage media includes a first substrate; a reflective layer; a data storage layer disposed between said first substrate and said reflective layer; a reactive layer comprising at least one reactive material disposed on said at least one reflective layer; an optically transparent second substrate disposed between the reactive layer and a laser incident surface of the optical storage media; and an oxygen permeable barrier layer disposed between the reactive layer and a laser incident surface of the optical storage media, said reactive layer having an initial percent reflectivity of about 50% or greater and a percent reflectivity of about 45% or less after exposure to oxygen.Type: GrantFiled: September 8, 2003Date of Patent: May 29, 2007Assignee: General Electric CompanyInventors: Daniel Robert Olson, Marc Brian Wisnudel, Marc Schaepkens, Robert Franklin Thompson
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Patent number: 7223521Abstract: Squarylium-metal chelate compounds as recording materials for optical recording media, and optical recording media using these compounds, which have excellent recording properties, light resistance and storage stability. The squarylium-metal chelate compound is represented by following Structural Formulas (1) and (2): In the formula (1), M represents a metal atom capable of coordinating; “a”, “b” and “c” each represents a squarylium dye ligand of formula (2), where “a” is different from “b”; and “c” may be the same as or different from “a” or “b”; and “m” represents 0 or 1. In the formula (2), R1 and R2 are the same or different and each represents an alkyl group, aralkyl group, aryl group or heterocyclic group, each of which may be substituted; and X represents an aryl group which may be substituted, a heterocyclic group which may be substituted, or Z3=CH—, wherein Z3 represents a heterocyclic group which may be substituted.Type: GrantFiled: February 11, 2004Date of Patent: May 29, 2007Assignees: Ricoh Company, Ltd., Kyowa Hakko Kogyo Co., Ltd., Kyowa Yuka Co., Ltd.Inventors: Tohru Yashiro, Tomomi Ishimi, Tatsuo Mikami, Ikuo Shimizu, Motoharu Kinugasa, Hiroshi Toyoda
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Patent number: 7223505Abstract: A method for forming micropatterns includes forming a thin film consisting of a single layer or of plural layers on a substrate, irradiating an energy beam to the thin film to elevate the temperature of a region to a predetermined temperature or higher to thereby modify the region of the thin film, and patterning the thin film at least in such a manner to leave over the modified region.Type: GrantFiled: February 8, 2005Date of Patent: May 29, 2007Assignee: Sharp Kabushiki KaishaInventors: Junji Hirokane, Michinobu Mieda, Go Mori
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Patent number: 7215352Abstract: System and method are devised to produce an optical recording medium suitable for identification and management. A recording layer formed in the optical recording medium is irradiated with writing light by a pickup. A visible image pattern suitable for identification, management or the like is formed on the optical recording medium by generating changes in optical characteristics of a portion irradiated with light and a portion not irradiated with light in the recording layer.Type: GrantFiled: April 8, 2005Date of Patent: May 8, 2007Assignee: Pioneer CorporationInventors: Keiichi Onodera, Hiroyuki Kurashina, Takeshi Takahashi
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Patent number: 7177261Abstract: Methods and apparatus are provided for making an optically readable storage media in which the reading beam passes through a bonding layer configured with a reactive material that transforms from an optically transparent state to an optically opaque state after exposure to a predefined stimulus, thereby inhibiting access to the data encoded on the optically readable storage media. The method includes steps of synthesizing a blocked dye combining the blocked dye with a carrier material curing the resultant combination deblocking the dye to produce a reduced dye in the resultant bonding layer exposing the optically readable storage media with the reactive material in its bonding layer to a predetermined stimulus. In a further aspect of the present invention methods and apparatus are provided for making an optically readable storage media wherein the reading light passes through the bonding layer and the data encoded information is encoded on the L1 substrate.Type: GrantFiled: June 5, 2002Date of Patent: February 13, 2007Assignee: Flexplay Technologies, Inc.Inventors: Robert F. Thompson, Yannis Bakos, Joe Paulus, Arthur R. LeBlanc, III
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Patent number: 7166417Abstract: When manufacturing a recording medium, a material layer 12 formed on a substrate 11 that composes the recording medium is exposed to a laser beam in accordance with a recording pattern. The material layer 12 has a predetermined reflectivity for the laser beam 13 so as to produce return light for the laser beam 13. By detecting this return light, the focusing of the laser beam on the material layer is adjusted. By doing so, a laser beam can be easily and accurately focused on a material layer during a process in which a laser beam is shone, in accordance with a recording pattern, onto a material layer formed on a recording medium or a production plate used when manufacturing a recording medium.Type: GrantFiled: February 28, 2001Date of Patent: January 23, 2007Assignee: Sony CorporationInventor: Koichiro Kishima
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Patent number: 7157163Abstract: The present invention provides a magnetic recording medium comprising a magnetic layer with excellent surface smoothness, which comprises a thin film magnetic layer of thickness in a range from 0.03 to 0.30 ?m that is ideal for short wavelength recording, and displays superior electromagnetic conversion characteristics. The magnetic recording medium comprises a magnetic layer containing at least a ferromagnetic powder and a binder resin on one surface of a non-magnetic support, wherein the thickness of the magnetic layer is within a range from 0.03 to 0.30 ?m, and the number of concavities with a depth of 30 nm or greater in the surface of the magnetic layer is 5 per 1 cm2 of surface area or less. Preferably, the value of the average depth Rv6 of the surface of the magnetic layer, as measured by a contact type surface roughness meter, is 12 nm or less.Type: GrantFiled: April 14, 2004Date of Patent: January 2, 2007Assignee: TDK CorporationInventors: Naoto Yajima, Takayoshi Kuwajima, Akihiko Seki, Hiroyuki Yamada, Kenichi Kitamura
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Patent number: 7110544Abstract: Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical disk. When playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.Type: GrantFiled: February 4, 2002Date of Patent: September 19, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
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Patent number: 7099264Abstract: The invention discloses a flat-plate lens to be built in an optical recording medium for improving the image-forming characteristics of the recording medium. The flat-plate lens of the invention comprises a layered thin film having a periodical structure in the direction of thickness thereof corresponding to a wavelength slightly longer than the wavelength of the light used for recording and retrieving information into and from the recording medium. The thin film of a periodical structure is formed by alternate lamination of pluralities of layers two materials having different refractive indices such as a combination of MgF2 and ZnS. When the thin film having such a periodical structure is formed with good uniformity allover the surface, the image-forming performance on the recording layer can be uniform irrespective of the position on the flat-plate lens.Type: GrantFiled: May 21, 2003Date of Patent: August 29, 2006Assignee: National Institute of Advanced Industrial Science and TechnologyInventors: Toshio Fukaya, Junji Tominaga
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Patent number: 7058001Abstract: A recording medium comprises a substrate and a recording layer overlaid on the substrate. The recording layer comprises a material, which has properties such that, when recording light having a predetermined wavelength ?1 is irradiated to the material, the material is capable of being caused to change into a fluorescent material and such that, when excitation light having a wavelength ?2 is then irradiated to the thus formed fluorescent material, the fluorescent material is capable of being caused to produce fluorescence. The wavelength ?1 of the recording light and the wavelength ?2 of the excitation light may be identical or different. The substrate may be constituted of a material having properties such that, when the excitation light is irradiated to the material, the material does not produce fluorescence having a wavelength identical with the wavelength of the fluorescence produced by the fluorescent material.Type: GrantFiled: February 27, 2001Date of Patent: June 6, 2006Assignee: Fuji Photo Film Co., Ltd.Inventors: Yoshio Inagaki, Masayuki Naya
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Patent number: 7027386Abstract: This invention relates to a read-only near-field optical disk using a zinc-oxide (ZnO) nano-structured thin film as the localized near-field optical interaction layer. This read-only near-field optical disk is a multi-layered body at least comprising; (a) a transparent substrate with pre-recorded pits or marks; (b) a reflection thin film; (c) a zinc-oxide (ZnO) nano-structured thin film which is capable of causing localized near-field optical interactions; (d) a first and a second protective and spacer layers formed above or below the localized near-field optical interaction layer, which are also made of transparent dielectric material. Ultrahigh density near-field optical readout can be achieved by localized near-field optical interaction between the zinc-oxide (ZnO) nano-structured thin film and the reflection layer on pre-recorded structure.Type: GrantFiled: December 30, 2002Date of Patent: April 11, 2006Assignee: National Taiwan UniversityInventors: Din-Ping Tsai, Yu-Hsuan Lin, Hsun-Hao Chang
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Patent number: 7022460Abstract: 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: GrantFiled: September 27, 2001Date of Patent: April 4, 2006Assignee: Bayer AktiengesellschaftInventors: Horst Berneth, Thomas Bieringer, Rainer Hagen, Serguei Kostromine
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Patent number: 6985373Abstract: An element for steering electromagnetic beams. The element includes a phase change material in combination with dielectric and other layers in a multilayer optical stack. The phase change material that is reversibly transformable between two or more structural states, where different structural states differ with respect to refractive index and/or extinction coefficient. The structural state of the phase change material establishes a phase angle state for the element that dictates the direction of propagation of an output beam produced from an incident electromagnetic beam. Depending on the structural state, the element adopts one of two principal phase angle states and a binary beam steering capability is achieved in which an incident electromagnetic beam can be redirected in either of two directions. In a preferred embodiment, the output beam is a reflected beam and the element includes a phase change material sandwiched between two dielectric materials and supported by a metal layer.Type: GrantFiled: July 27, 2004Date of Patent: January 10, 2006Assignee: Energy Conversion Devices, Inc.Inventor: David Tsu
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Patent number: 6965556Abstract: In an optical information medium having an information bearing surface having projections and depressions and/or capable of forming recorded marks, a functional layer is added. The information borne on the information bearing surface can be read by using reading light of a wavelength longer than 4NA·PL wherein PL is the minimum size of the projections and depressions or the recorded marks and NA is the numerical aperture of a reading optical system, setting the power of the reading light within such a range that the functional layer does not change its complex index of refraction, and irradiating the reading light to the information bearing surface constructed by the functional layer or to the information bearing surface through the functional layer or to the functional layer through the information bearing surface. The medium enables reading at a high resolution beyond the diffraction limit.Type: GrantFiled: July 3, 2000Date of Patent: November 15, 2005Assignee: TDK CorporationInventors: Takashi Kikukawa, Hajime Utsunomiya, Hiroshi Shingai, Tatsuya Kato
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Patent number: 6961302Abstract: A method and structure for intensifying track seeking signals from an optical disk, in particular, a recordable digital versatile disk (DVD-R). With the addition of an optical correction layer between a dye material layer and a reflection layer inside the DVD-R, track-seeking signals of the optical disk are intensified and recording quality of the optical disk is improved. The optical correction layer is a transparent or semi-transparent layer made from inorganic materials. The optical correction layer is formed over the dye material layer in a sputtering process.Type: GrantFiled: November 8, 2002Date of Patent: November 1, 2005Assignee: Ritek CorporationInventors: Shyh-yeu Wang, Biing-Hwang Lin, Chun-Ying Lin
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Patent number: 6921624Abstract: Disclosed is an optical recording medium comprising a recording layer. The recording layer contains: a charge generation material generating an electron and a hole by light irradiation; a charge transport material transporting one of the electron and the hole; a charge trap which traps the transported one of the electron and the hole to separate the electron and the hole; and a non-linear optical material which changes optical properties of the recording layer in accordance with electric field formed by the electron and the hole being separated from each other. The non-linear optical material has an asymmetrical carbon atom and a cyclic group. Or, it is a cyclic-group-containing constituent having: an inversion symmetric pi-electron system; at least one of an electron donating group and an electron accepting group which are bonded to the inversion symmetric ?-electron system; and an asymmetrical carbon atom.Type: GrantFiled: September 9, 2002Date of Patent: July 26, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Akiko Hirao, Kazuki Matsumoto, Takayuki Tsukamoto, Hideyuki Nishizawa
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Patent number: 6901044Abstract: An optical information medium (20) for erasable recording by means of a laser-light beam (10) is provided. A substrate (1) holds a stack (2) of layers with a phase-change recording layer (5) between a first dielectric layer (4) and a second dielectric layer (6). A light-absorptive layer (7) is present proximate the recording layer (5) and is made of a compound of the formula QRx, in which Q is the element Si, Ge, Ti, Zr, Hf, Nb or Ta, R is the element O or N, and 0<x?2.5, in order to achieve that 0.8<Ac/Aa<1.50, in which Ac and Aa are the respective quantities of laser-light absorbed in the recording layer (5) in the crystalline state and the amorphous state at a laser-light wavelength selected from a range of 350-450 nm. Thus high data rates and low data jitters are achieved at this short wavelength range by tuning x to an optimal value during manufacture of the optical information medium.Type: GrantFiled: December 4, 2001Date of Patent: May 31, 2005Assignee: Koninklijke Philips Electronics N.V.Inventors: Johannes Cornelis Norbertus Rijpers, Guo-Fu Zhou
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Patent number: 6882460Abstract: An element for reflecting, transmitting, focusing, defocusing or wavefront correction of electromagnetic radiation in the terahertz frequency range. The elements include a grid of conductive strips including active regions comprising a chalcogenide phase change material. The chalcogenide material can be in an amorphous, crystalline or partially crystalline state. The dispersive characteristics of the grid (e.g. impedance, admittance, capacitance, inductance) influence one or more of the reflection, transmission, state of focusing or wavefront characteristics of incident electromagnetic radiation through the action of a stored phase taper formed by establishing a crystallinity gradient over a series of active chalcogenide regions or domains in one or more directions of the element.Type: GrantFiled: September 25, 2003Date of Patent: April 19, 2005Assignee: Energy Conversion Devices, Inc.Inventors: David Tsu, Robert O. Miller
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Patent number: 6862685Abstract: Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical disk. When playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.Type: GrantFiled: February 4, 2002Date of Patent: March 1, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro Moriya
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Patent number: 6842419Abstract: An optical information recording medium includes a substrate, first information recording layer, and second information recording layer. The first information recording layer includes a recording film, first dielectric film whose complex index has a real part n1, second dielectric film whose complex index has a real part n2, and third dielectric film whose complex index has a real part n3. Relationships n1>n2 and n3>n2 are satisfied.Type: GrantFiled: March 22, 2002Date of Patent: January 11, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Naomasa Nakamura, Sumio Ashida, Keiichiro Yusu, Katsutaro Ichihara, Noritake Oomachi
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Patent number: 6839316Abstract: System and methods are described for inhibiting the readability of an optical media due to changes in a pseudo-reflective material that composes the optical media after the optical media has been exposed to air for a predetermined time. An optical media includes a data encoded component. At least a fraction of the data encoded component transforms from a substantially optically reflective state to a substantially optically non-reflective state as at-least-in-part a function of time from an initializing event. The systems and methods provide advantages because of low cost, limited content lifetime, avoidance of rental returns and minimum changes to existing manufacturing processes.Type: GrantFiled: January 2, 2003Date of Patent: January 4, 2005Assignee: Flexplay Technologies, Inc.Inventors: Yannis Bakos, Erik Brynjolfsson, Adam Heller, Ephraim Heller
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Publication number: 20040268378Abstract: An optical recording medium having a plural number of recording layers includes a n-th recording layer (23) (n≧1), made up by a substrate (20) and a semi-reflective layer (21) carried by the substrate (20) and adapted for partially reflecting and partially transmitting the incident light, a (n+1)th recording layer (28), made up by another substrate (25) and a reflecting layer (26) carried by the substrate (25) and adapted for reflecting the incident light, and a light condensing layer (24) for condensing the light incident via the n-th recording layer (23) on the (n+1)th recording layer (28).Type: ApplicationFiled: August 12, 2004Publication date: December 30, 2004Inventors: Tetsujiro Kondo, Norifumi Yoshiwara
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Publication number: 20040246884Abstract: The present invention provides a method for manufacturing an optical recording medium by forming a light-transmitting layer employing a photo-curable resin, yet affording superior mechanical properties. The present invention also provides an apparatus for manufacturing an optical recording medium suitable for use in the above-mentioned method. A method for manufacturing an optical recording medium (1) having, on a supporting substrate (2), at least one recording layer (5) and a light-transmitting layer (7) on the recording layer (5), comprising the steps of providing an energy ray-curable resin layer on the recording layer (5), and irradiating the resin layer with an energy ray at least twice to form the light-transmitting layer (7).Type: ApplicationFiled: March 9, 2004Publication date: December 9, 2004Inventors: Tsuyoshi Komaki, Mamoru Usami
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Patent number: 6821708Abstract: This invention provides a data storage media comprising at least a cyanine-TCNQ complex dye having the structural formula: wherein Q and Q′ denote aromatic or polyaromatic, R1 and R2 are selected from the group consisting of alkyl, arylester, alkoxy, alkylthio, and alkoxythio etc., n represents an integer of 0, 1, 2, and 3, TCNQ-m represents 7,7′,8,8′-tetracyanoquinodimethane or its derivatives, and m is an integer of 1 or 2. The data storage media comprising the cyanine-TCNQ complex dye includes a reflection optical recording media and a non-reflection fluorescent optical recording media suiting the requirement.Type: GrantFiled: February 28, 2003Date of Patent: November 23, 2004Assignees: Industrial Technology Research Institute, National Tsing Hua UniversityInventors: Wen-Yih Liao, Ming-Chia Lee, Chien-Liang Huang, Chuen-Fuw Yan, Tzuan-Ren Jeng, Andrew Teh Hu, Chung-Chun Lee
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Publication number: 20040219455Abstract: An ultra high-density recordable optical data recording media that which adds a near-field electromagnetic field enhancement layer between a substrate and a recording layer, by using the resonance enhancement effect produced between the near-field electromagnetic field enhancement layer and the recording layer to read very small recording marks (less than 100 nm) and increase the carrier to noise ratio and the recording density of the disks.Type: ApplicationFiled: September 4, 2003Publication date: November 4, 2004Inventors: Mei-Rurng Tseng, Wei-Chih Hsu, Song-Yeu Tsai, Min-Jen Deng
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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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Publication number: 20040214107Abstract: The present invention provides an optical recording medium including a recording layer 2 and an optical reflection layer 3 formed on a substrate 1. The recording layer 2 contains at least one particular polymethine pigment selected from polymethine pigments having 1 to 4 carbons in the methine main chain, so as to obtain a sufficient recording sensitivity for a red wavelength range of light.Type: ApplicationFiled: March 4, 2004Publication date: October 28, 2004Inventors: Shinichiro Tamura, Mitsuaki Oyamada
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Patent number: 6806451Abstract: A multi-layer imaging medium has a layer that absorbs radiation at a wavelength used by an optical auto-focus system. Spurious reflections are suppressed. The layer transmits radiation at a wavelength used to image the medium. The layer may function as a support layer for the medium. Thermal imaging media may be made according to the invention.Type: GrantFiled: September 18, 2002Date of Patent: October 19, 2004Assignee: Creo Inc.Inventor: Tangyu Wang
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Publication number: 20040197705Abstract: A cyanine compound of formula (I), an optical filter containing the cyanine compound, and an optical recording material containing the cyanine compound which is used to form an optical recording layer of an optical recording medium: 1Type: ApplicationFiled: March 30, 2004Publication date: October 7, 2004Applicant: ASAHI DENKA CO., LTD.Inventors: Masaaki Shimizu, Koichi Shigeno, Toru Yano
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Patent number: RE38979Abstract: An optical information recording medium is here disclosed which comprises a transparent substrate, a recording layer comprising an organic dyestuff on which information can be written by a laser beam, a reflective layer and a protective layer formed in this order on the substrate, the aforesaid optical information recording medium being characterized by containing a pit-edge control agent for the formation of recording pits, particularly a dyestuff thermal decomposition accelerator in the recording layer. By the addition of the pit-edge control agent, deviation properties and jitter properties can be remarkably improved, whereby a CD-R medium having a low error rate and good recording properties can be provided. In consequence, stable compatibility with a commercial CD player can be secured.Type: GrantFiled: March 1, 2001Date of Patent: February 14, 2006Assignee: Mitsui Chemicals, Inc.Inventors: Tadashi Koike, Hideki Umehara, Yuji Inatomi, Takeshi Tsuda, Sumio Hirose
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Patent number: RE40330Abstract: The present invention provides an optical disk 9 with a duplication preventing function, reproducing system 47 for the optical disk 9, optical disk reproducing method, method of fabricating an optical disk original record, and illegal program operation stopping method. An area in which a CP signal 24 is recorded is made after a signal having a constant pattern in the optical disk, the CP signal 24 being produced such that the center of an eye pattern is shifted from the center of the amplitude. In the reproducing system, CP signal arrangement information 25 or a CP preceding signal 26 is detected, before an offset voltage is applied to a threshold value to be used in demodulating an RF signal into a digital signal so that the threshold value varies, thus normally reproducing the signal in which center of the eye patter is shifted from the center of the amplitude. The reproducing system has a function whereby the reproduction is stopped when a predetermined offset signal is not reproduced.Type: GrantFiled: December 28, 1994Date of Patent: May 20, 2008Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Fumiaki Ueno, Mitsuaki Oshima