Patents by Inventor Urara Ichihara
Urara Ichihara has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7498103Abstract: Disclosed is a holographic recording medium and methods of manufacturing the holographic recording medium. The example of the medium has a recording layer containing a three dimensionally cross-linked polymer matrix including an epoxy resin, a radically polymerizable monomer, and a photo radical polymerization initiator. The radically polymerizable monomer comprises both N-vinylcarbazole (VC) and N-vinylpyrrolidone (VP) or N-vinylcarbazole alone. The weight ratio of N-vinylcarbazole (VC) to the sum of N-vinylcarbazole (VC) and N-vinylpyrrolidone (VP), i.e., (VC/(VC+VP)), is not smaller than 0.75 and not larger than 1.0.Type: GrantFiled: May 16, 2005Date of Patent: March 3, 2009Assignee: Kabushiki Kaisha ToshibaInventors: Rumiko Hayase, Akiko Hirao, Kazuki Matsumoto, Takayuki Tsukamoto, Urara Ichihara, legal representative, Katsutaro Ichihara
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Patent number: 7494747Abstract: Disclosed is a holographic optical recording medium, comprising a recording layer containing a three dimensionally cross-linked polymer matrix, a radically polymerizable compound, and a photo radical polymerization initiator, the three dimensionally cross-linked polymer matrix comprising a cured material of a reaction product between a diglycidyl ether and an amine, the diglycidyl ether being selected from the group consisting of 1,6-hexanediol diglycidyl ether and diethylene glycol diglycidyl ether.Type: GrantFiled: November 12, 2004Date of Patent: February 24, 2009Assignee: Kabushiki Kaisha ToshibaInventors: Rumiko Hayase, Akiko Hirao, Kazuki Matsumoto, Takayuki Tsukamoto, Urara Ichihara, legal representative, Katsutaro Ichihara
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Publication number: 20080138718Abstract: Disclosed is a holographic optical recording medium comprising a recording layer having a skeleton structure represented by following general formula (A): where R1 denotes an atomic group selected from the group consisting of a linear or branched alkylene group having 1 to 10 carbon atoms and an arylene group having 1 to 10 carbon atoms, it being possible for a halogen atom or an alkoxy group to be substituted in R1, and each of p and q is 0 or 1.Type: ApplicationFiled: January 25, 2008Publication date: June 12, 2008Inventors: Rumiko Hayase, Akiko Hirao, Kazuki Matsumoto, Takayuki Tsukamoto, Urara Ichihara
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Patent number: 7357969Abstract: A phase-change optical recording medium has a first information layer including a phase-change optical recording film arranged in a position close to the light incident side, a second information layer including another phase-change optical recording film arranged in a position remote from the light incident side and an interlayer separating film arranged between the first information layer and the second information layer, in which at least one of the first information layer and the second information layer includes a noise reduction film in contact with the interlayer separating film. The noise reduction film is formed of SiOx (1?x?2) or SiOC.Type: GrantFiled: October 29, 2004Date of Patent: April 15, 2008Assignee: Kabushiki Kaisha ToshibaInventors: Tsukasa Nakai, Sumio Ashida, Keiichiro Yusu, Takayuki Tsukamoto, Noritake Oomachi, Naomasa Nakamura, Urara Ichihara, legal representative, Katsutaro Ichihara
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Patent number: 7291375Abstract: A phase-change optical recording medium has a phase-change recording film to which recording and erasure can be reversibly performed by irradiation with light, and at least one dielectric film formed of a SiOC film containing Si, O and C, and having a carbon concentration within a range of between 0.1 and 30 atomic %.Type: GrantFiled: June 16, 2006Date of Patent: November 6, 2007Assignee: Kabushiki Kaisha ToshibaInventors: Tsukasa Nakai, Sumio Ashida, Keiichiro Yusu, Takayuki Tsukamoto, Noritake Oomachi, Naomasa Nakamura, Urara Ichihara, legal representative, Katsutaro Ichihara, deceased
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Publication number: 20070253051Abstract: A conductive thin film has first and second surfaces and at least one opening extending through from the first surface to the second surface. At least on one of the first and second surfaces, first and second periodic surface patterns having different period lengths are provided. The period length of the second periodic surface pattern is substantially equal to an odd integral multiple of a half of the period length of the first periodic surface pattern. With this, surface plasmon polaritons excited by the first periodic surface pattern undergo odd-order Bragg reflection by the second periodic surface pattern. As a result, the intensity of the light falling on the first surface and transmitted to the second surface through the opening is increased with high efficiency.Type: ApplicationFiled: September 17, 2004Publication date: November 1, 2007Inventors: Kunihiko Ishihara, Genichi Hatakoshi, Keishi Ohashi, Katsutaro Ichihara, Urara Ichihara
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Patent number: 7270916Abstract: Disclosed is a recording medium comprising a recording layer including a photo-acid generating agent that generates an acid upon irradiation with an actinic radiation and a polymer having a polymerizable substituent group bonded to a main chain of the polymer via a functional group that cleaves in the presence of the acid.Type: GrantFiled: June 17, 2004Date of Patent: September 18, 2007Assignee: Kabushiki Kaisha ToshibaInventors: Naoko Kihara, Urara Ichihara, legal representative, Akiko Hirao, Kazuki Matsumoto, Hideyuki Nishizawa, Katsutaro Ichihara, deceased
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Patent number: 7254106Abstract: A method for storing holographic data in a medium having a reflection layer and a recording layer comprises: recording, rotating and repeating. An interference pattern is recorded at a recording position of the recording layer of the medium in a stationary state. The interference pattern is formed by an interference between an object beam and a reference beam which are irradiated into the recording layer from an opposite side of the reflection layer. The medium is rotated so as to shift the recording position by a distance of n×Sh where n is a positive integer and Sh is a predetermined recording shift amount. The recording and the rotating are repeated alternately.Type: GrantFiled: September 1, 2004Date of Patent: August 7, 2007Assignee: Kabushiki Kaisha ToshibaInventors: Urara Ichihara, legal representative, Kazuki Matsumoto, Akiko Hirao, Rumiko Hayase, Katsutaro Ichihara, deceased
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Patent number: 7214416Abstract: 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: October 26, 2004Date of Patent: May 8, 2007Assignee: Kabushiki Kaisha ToshibaInventors: Tsukasa Nakai, Sumio Ashida, Keiichiro Yusu, Takayuki Tsukamoto, Noritake Oomachi, Naomasa Nakamura, Katsutaro Ichihara, Deceased, Urara Ichihara, Legal Representative
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Publication number: 20060275577Abstract: 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: ApplicationFiled: August 14, 2006Publication date: December 7, 2006Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tsukasa Nakai, Sumio Ashida, Keiichiro Yusu, Takayuki Tsukamoto, Noritake Oomachi, Naomasa Nakamura, Katsutaro Ichihara, Urara Ichihara
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Patent number: 7132147Abstract: A phase-change optical recording medium has a phase-change recording film to which recording and erasure can be reversibly performed by irradiation with light, and at least one dielectric film formed of a SiOC film containing Si, O and C, and having a carbon concentration within a range of between 0.1 and 30 atomic %.Type: GrantFiled: June 29, 2004Date of Patent: November 7, 2006Assignee: Kabushiki Kaisha ToshibaInventors: Tsukasa Nakai, Sumio Ashida, Keiichiro Yusu, Takayuki Tsukamoto, Noritake Oomachi, Naomasa Nakamura, Urara Ichihara, legal representative, Katsutaro Ichihara, deceased
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Publication number: 20060014081Abstract: Disclosed is a holographic recording medium and methods of manufacturing the holographic recording medium. The example of the medium has a recording layer containing a three dimensionally cross-linked polymer matrix including an epoxy resin, a radically polymerizable monomer, and a photo radical polymerization initiator. The radically polymerizable monomer comprises both N-vinylcarbazole (VC) and N-vinylpyrrolidone (VP) or N-vinylcarbazole alone. The weight ratio of N-vinylcarbazole (VC) to the sum of N-vinylcarbazole (VC) and N-vinylpyrrolidone (VP), i.e., (VC/(VC+VP)), is not smaller than 0.75 and not larger than 1.0.Type: ApplicationFiled: May 16, 2005Publication date: January 19, 2006Inventors: Rumiko Hayase, Akiko Hirao, Kazuki Matsumoto, Takayuki Tsukamoto, Katsutaro Ichihara, Urara Ichihara
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Publication number: 20050196679Abstract: Disclosed is a holographic optical recording medium, comprising a recording layer containing a three dimensionally cross-linked polymer matrix, a radically polymerizable compound, and a photo radical polymerization initiator, the three dimensionally cross-linked polymer matrix comprising a cured material of a reaction product between a diglycidyl ether and an amine, the diglycidyl ether being selected from the group consisting of 1,6-hexanediol diglycidyl ether and diethylene glycol diglycidyl ether.Type: ApplicationFiled: November 12, 2004Publication date: September 8, 2005Inventors: Rumiko Hayase, Akiko Hirao, Kazuki Matsumoto, Takayuki Tsukamoto, Katsutaro Ichihara, Urara Ichihara
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Publication number: 20050195722Abstract: Provided is a technique for reproducing information recorded on a holographic recording medium including a reflecting layer and a recording layer. When reproducing, a reproducing reference light is focused on a reflecting surface of the reflecting layer to produce a phase conjugate reproduced light and an ordinary reproduced light, and the phase conjugate reproduced light and the ordinary reproduced light are guided to a sensing surface of an image sensor to produce on the sensing surface a first reproduced image and a second reproduced image smaller than the first reproduced image, respectively. An intensity of the ordinary reproduced light on the sensing surface is higher than an intensity of the phase conjugate reproduced light on the sensing surface. An output of the image sensor corresponding to a non-overlapping portion of the first reproduced image which does not overlap the second reproduced image is utilized for reproducing the information.Type: ApplicationFiled: February 25, 2005Publication date: September 8, 2005Inventors: Takayuki Tsukamoto, Kazuki Matsumoto, Rumiko Hayase, Akiko Hirao, Katsutaro Ichihara, Urara Ichihara
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Publication number: 20050112499Abstract: 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: ApplicationFiled: October 26, 2004Publication date: May 26, 2005Inventors: Tsukasa Nakai, Sumio Ashida, Keiichiro Yusu, Takayuki Tsukamoto, Noritake Oomachi, Naomasa Nakamura, Urara Ichihara
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Publication number: 20050106353Abstract: A phase-change optical recording medium has a first information layer including a phase-change optical recording film arranged in a position close to the light incident side, a second information layer including another phase-change optical-recording film arranged in a position remote from the light incident side and an interlayer separating film arranged between the first information layer and the second information layer, in which at least one of the first information layer and the second information layer includes a noise reduction film in contact with the interlayer separating film. The noise reduction film is formed of SiOx (1?x?2) or SiOC.Type: ApplicationFiled: October 29, 2004Publication date: May 19, 2005Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tsukasa Nakai, Sumio Ashida, Keiichiro Yusu, Takayuki Tsukamoto, Noritake Oomachi, Naomasa Nakamura, Katsutaro Ichihara, Urara Ichihara
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Publication number: 20050088947Abstract: A method for storing holographic data in a medium having a reflection layer and a recording layer comprises: recording, rotating and repeating. An interference pattern is recorded at a recording position of the recording layer of the medium in a stationary state. The interference pattern is formed by an interference between an object beam and a reference beam which are irradiated into the recording layer from an opposite side of the reflection layer. The medium is rotated so as to shift the recording position by a distance of n×Sh where n is a positive integer and Sh is a predetermined recording shift amount. The recording and the rotating are repeated alternately.Type: ApplicationFiled: September 1, 2004Publication date: April 28, 2005Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Katsutaro Ichihara, Urara Ichihara, Kazuki Matsumoto, Akiko Hirao, Rumiko Hayase
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Publication number: 20050025035Abstract: A phase-change optical recording medium has a phase-change recording film to which recording and erasure can be reversibly performed by irradiation with light, and at least one dielectric film formed of a SiOC film containing Si, O and C, and having a carbon concentration within a range of between 0.1 and 30 atomic %.Type: ApplicationFiled: June 29, 2004Publication date: February 3, 2005Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tsukasa Nakai, Sumio Ashida, Keiichiro Yusu, Takayuki Tsukamoto, Noritake Oomachi, Naomasa Nakamura, Urara Ichihara
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Publication number: 20050026079Abstract: Disclosed is a recording medium comprising a recording layer including a photo-acid generating agent that generates an acid upon irradiation with an actinic radiation and a polymer having a polymerizable substituent group bonded to a main chain of the polymer via a functional group that cleaves in the presence of the acid.Type: ApplicationFiled: June 17, 2004Publication date: February 3, 2005Inventors: Naoko Kihara, Katsutaro Ichihara, Akiko Hirao, Kazuki Matsumoto, Hideyuki Nishizawa, Urara Ichihara
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Publication number: 20050002311Abstract: A hologram recording medium has a transparent substrate having an incidence surface, on which a write beam and a reference beam are made incident, and a servo surface opposite to the incidence surface, the servo surface including a header section and a data section, a reflecting layer formed on the servo surface of the transparent substrate, and a hologram recording layer provided on the incidence surface of the transparent substrate, the servo surface having intermittent tracking grooves in the data section except for recording positions, and a width of the tracking grooves being set at a value to less than an e?2 diameter of the reference beam.Type: ApplicationFiled: April 30, 2004Publication date: January 6, 2005Inventors: Katsutaro Ichihara, Urara Ichihara, Akiko Hirao, Kazuki Matsumoto