Patents by Inventor Fumi Hara
Fumi Hara 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: 8119216Abstract: An optical information recording medium has at least an optical reflective layer, an optical recording layer, an protective layer, and an optical transparency layer formed in that order on the main surface of a disc-shaped substrate. An area in which the protective layer is formed is made wider than an area in which the reflective layer is formed, and made narrower than an area in which the optical transparency layer is formed.Type: GrantFiled: December 11, 2008Date of Patent: February 21, 2012Assignee: Taiyo Yuden Co., Ltd.Inventors: Fumi Hara, Takeshi Otsu, Isao Matsuda, Shingo Katoh, Masashi Satoh
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Patent number: 8025947Abstract: An optical information recording medium has a substrate, and an optical reflection layer, an optical recording layer containing an organic dye, an interlayer, and a cover layer formed in this order on the substrate. The interlayer contains a sputtered Nb2O5—Al2O3-based composite oxide having an Nb2O5 content of more than 50 mol % and less than 60 mol %.Type: GrantFiled: October 1, 2008Date of Patent: September 27, 2011Assignee: Taiyo Yuden Co., LtdInventors: Fumi Hara, Takeshi Otsu, Isao Matsuda, Shingo Katoh, Masashi Satoh
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Patent number: 8018822Abstract: An optical information recording medium includes an optical disk body including a light-transmitting substrate, a recording layer provided on a main surface of the light-transmitting substrate over a region in which pre-grooves are formed and a portion of a region in which dummy grooves are formed, and a reflecting layer provided over the recording layer and a region of the light-transmitting substrate in which the recording layer is not provided; and an ink receiving layer provided on the label surface side of the optical disc body. The dummy grooves provided in at least a portion of the region in which the dye material is not applied have a pitch larger than that of the pre-grooves, are shallower than that of the pre-grooves, or have half-width less than that of the pre-grooves.Type: GrantFiled: October 12, 2007Date of Patent: September 13, 2011Assignee: Taiyo Yuden Co., LtdInventors: Takeshi Otsu, Fumi Hara, Shinichi Kojo, Atsuo Shimizu, Motomitsu Hagiwara
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Patent number: 8014262Abstract: An optical information recording medium includes a substrate having a through-hole provided at the central portion thereof and a guiding groove provided on a surface at the light-incident side; a reflective layer provided on the surface of the substrate having the guiding groove; a recording layer provided on the reflective layer and made of an organic substance containing a dye; and a light-transmissive cover layer provided on the recording layer, wherein the cover layer is made of a curable resin, and a modulus of elasticity of at least a portion of the cover layer facing the recording layer is in the range of about 34 MPa to about 96 MPa at 25° C.Type: GrantFiled: April 16, 2008Date of Patent: September 6, 2011Assignee: Taiyo Yuden Co., Ltd.Inventors: Fumi Hara, Takeshi Otsu, Masashi Satoh, Shingo Katoh, Isao Matsuda
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Patent number: 7981494Abstract: In a write-once optical information recording medium including a substrate, a groove-shaped track such as a guiding groove, and an optical recording layer containing an organic dye material and disposed on the guiding groove, wherein information is recorded by irradiating a short-wavelength laser beam from a surface of the optical recording layer opposite the substrate, and the information can be reproduced by reading a change in the reflected light of a short-wavelength laser beam after the information recording, an unrecorded portion of the optical recording layer has a lower reflectance than a pit portion formed after recording to a portion of the optical recording layer, the optical recording layer has a refractive index n in the range of about 1.2 to about 2.1 before recording and an extinction coefficient k in the range of about 0.01 to about 0.7 before recording, and n+k is in the range of about 1.4 to about 2.1.Type: GrantFiled: March 19, 2008Date of Patent: July 19, 2011Assignee: Taiyo Yuden Co., Ltd.Inventors: Takuo Kodaira, Isao Matsuda, Takeshi Otsu, Fumi Hara
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Patent number: 7867595Abstract: An optical information recording medium is provided having a superior jitter property even when an organic substance is used for a recording layer. The optical information recording medium has a substrate having a penetrating hole in a central portion thereof and a spiral pre-groove provided in one surface of the substrate, a reflection layer provided on the surface of the substrate in which the pre-groove is provided, a recording layer which is provided on the reflection layer and which is composed of an organic substance including a dye, and a light transmissive cover layer provided on the recording layer. In the optical information recording medium, the cover layer has an elastic modulus of 40 MPa or less at 25° C. in an interface region facing the recording layer.Type: GrantFiled: November 14, 2007Date of Patent: January 11, 2011Assignee: Taiyo Yuden Co., Ltd.Inventors: Takeshi Otsu, Akimasa Miyata, Motomitsu Hagiwara, Isao Matsuda, Fumi Hara, Shingo Kato, Takuo Kodaira
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Patent number: 7859982Abstract: An optical information recording medium comprises at least a substrate on which a groove is formed in a recording area, a recording layer comprising an organic dye, and a reflective layer. The recording area has a preformat area and a data area, and the groove in the preformat area is narrower or shallower than that in the data area.Type: GrantFiled: April 25, 2007Date of Patent: December 28, 2010Assignee: Taiyo Yuden, Co., Ltd.Inventors: Isao Matsuda, Toru Fujii, Yoshikazu Takagishi, Fumi Hara
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Patent number: 7830778Abstract: An optical information recording medium having a disk-shaped substrate formed with spiral grooves on one main surface, and having an optical reflection layer formed with grooves at the surface corresponding to the grooves of the substrate for reflecting a laser beam, an optical recording layer, a protective layer, and an optical transparency layer in this order on the main surface thereof. The optical information recording medium has a main information area and a sub-information area to the inner circumferential side thereof, in which the track pitch TrB of the grooves in the sub-information area is about 0.32 ?m or less, and the depth D of the grooves and the half-band width W of the grooves satisfy a relation represented by: W?2D+70, whereby the difference between the reflectivity at the land surface and the reflectivity at the groove surface in the sub-information area can be restricted to less than 30%, thereby preventing occurrence of mis-decipherment for BCA marks.Type: GrantFiled: February 8, 2008Date of Patent: November 9, 2010Assignee: Taiyo Yuden Co., Ltd.Inventors: Isao Matsuda, Fumi Hara, Takeshi Otsu, Motomitsu Hagiwara, Akimasa Miyata
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Publication number: 20100232277Abstract: An object of the present invention is to provide an optical information recording medium suited for high-density and high-speed recording using a recording wavelength of 360 to 450 nm, in particular, around 400 nm (for example, 405 nm) and its recording method. The present invention is based not on a conventional High to Low method but on a Low to High method and, when the reflectance of the pit is higher than that of the non-pit area, the maximum film thickness of the recording layer at the track area where the pits are arranged is in the range from 25 to 60 nm and the maximum film thickness of the recording layer at the area adjacent to the track area is in the range of 5 to 30 nm, a satisfactory push-pull signal can be obtained. Further, the film thickness of the reflecting layer is preferably set in the range from 120 to 180 nm, and groove width of the reflection layer is preferably set in the range from 85 to 150 nm.Type: ApplicationFiled: February 2, 2007Publication date: September 16, 2010Applicant: TAIYO YUDEN CO., LTD.Inventors: Isao Matsuda, Fumi Hara
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Publication number: 20090180374Abstract: An optical information recording medium contains at least an optical reflective layer, an optical recording layer, a protective layer, and an optical transparency layer formed in this order on a main surface of a substrate, and has a main-information area and a sub-information area that contains an optically readable mark. The mark is constituted by removing at least the optical reflective layer in a bar cord pattern and then forming a next layer in the order over the bar cord-patterned layer.Type: ApplicationFiled: December 11, 2008Publication date: July 16, 2009Applicant: Taiyo Yuden Co., Ltd.Inventors: Fumi Hara, Takeshi Otsu, Isao Matsuda, Shingo Katoh, Masashi Satoh, Yutaka Shibata
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Publication number: 20090154332Abstract: An optical information recording medium has at least an optical reflective layer, an optical recording layer, an protective layer, and an optical transparency layer formed in that order on the main surface of a disc-shaped substrate. An area in which the protective layer is formed is made wider than an area in which the reflective layer is formed, and made narrower than an area in which the optical transparency layer is formed.Type: ApplicationFiled: December 11, 2008Publication date: June 18, 2009Applicant: Taiyo Yuden Co., Ltd.Inventors: Fumi Hara, Takeshi Otsu, Isao Matsuda, Shingo Katoh, Masashi Satoh
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Publication number: 20090092783Abstract: An optical information recording medium has a substrate, and an optical reflection layer, an optical recording layer containing an organic dye, an interlayer, and a cover layer formed in this order on the substrate. The interlayer contains a sputtered Nb2O5—Al203-based composite oxide having an Nb2O5 content of more than 50 mol % and less than 60 mol %.Type: ApplicationFiled: October 1, 2008Publication date: April 9, 2009Applicant: TAIYO YUDEN CO., LTD.Inventors: Fumi HARA, Takeshi OTSU, Isao MATSUDA, Shingo KATOH, Masashi SATOH
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Patent number: 7498070Abstract: For improving the humidity resistance reliability and the jitter property of an optical disk, the adhesive layer used for bonding a bonding type optical information recording medium is defined such that the glass transition temperature is 100° C. or higher at 200° C. or lower, the modulus of elasticity at 25 to 80° C. is 1000 MPa or more, the adhesion strength thereof is 4 N or more, the reflective layer is defined such that the hardness is 60 mgf/?m2 or more as the nano indentation hardness, and the dye recording layer is defined such that the water solubility of the dye as light absorption is 0.2 or less.Type: GrantFiled: September 13, 2005Date of Patent: March 3, 2009Assignee: Taiyo Yuden Co., LtdInventors: Sachiko Ishibashi, Fumi Hara, Toru Fujii, Yuji Arai
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Publication number: 20080291811Abstract: An optical information recording medium that has satisfactory main information recording characteristics and in which burst cutting area (BCA) marks can be formed without damaging a protective layer or a light-transmitting layer is provided. In forming the light-reflecting layer by vapor deposition, sputtering, ion-plating, or the like, part of the region is masked so as to make the thickness and/or material of the light-reflecting layer in a main information recording region where main information is recorded different from that of the light-reflecting layer in a BCA equivalent region. As a result, burst cutting of the light-reflecting layer in the BCA equivalent region becomes easier than in the main information recording region.Type: ApplicationFiled: May 20, 2008Publication date: November 27, 2008Applicant: Taiyo Yuden Co., Ltd.Inventors: Fumi Hara, Takeshi Otsu, Isao Matsuda, Shingo Katoh, Masashi Satoh
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Publication number: 20080259762Abstract: An optical information recording medium includes a substrate having a through-hole provided at the central portion thereof and a guiding groove provided on a surface at the light-incident side; a reflective layer provided on the surface of the substrate having the guiding groove; a recording layer provided on the reflective layer and made of an organic substance containing a dye; and a light-transmissive cover layer provided on the recording layer, wherein the cover layer is made of a curable resin, and a modulus of elasticity of at least a portion of the cover layer facing the recording layer is in the range of about 34 MPa to about 96 MPa at 25° C.Type: ApplicationFiled: April 16, 2008Publication date: October 23, 2008Applicant: Taiyo Yuden Co., Ltd.Inventors: Fumi Hara, Takeshi Otsu, Masashi Satoh, Shingo Katoh, Isao Matsuda
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Publication number: 20080260984Abstract: In a write-once optical information recording medium including a substrate, a groove-shaped track such as a guiding groove, and an optical recording layer containing an organic dye material and disposed on the guiding groove, wherein information is recorded by irradiating a short-wavelength laser beam from a surface of the optical recording layer opposite the substrate, and the information can be reproduced by reading a change in the reflected light of a short-wavelength laser beam after the information recording, an unrecorded portion of the optical recording layer has a lower reflectance than a pit portion formed after recording to a portion of the optical recording layer, the optical recording layer has a refractive index n in the range of about 1.2 to about 2.1 before recording and an extinction coefficient k in the range of about 0.01 to about 0.7 before recording, and n+k is in the range of about 1.4 to about 2.1.Type: ApplicationFiled: March 19, 2008Publication date: October 23, 2008Applicant: Taiyo Yuden Co., Ltd.Inventors: Takuo Kodaira, Isao Matsuda, Takeshi Otsu, Fumi Hara
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Publication number: 20080198731Abstract: An optical information recording medium having a disk-shaped substrate formed with spiral grooves on one main surface, and having an optical reflection layer formed with grooves at the surface corresponding to the grooves of the substrate for reflecting a laser beam, an optical recording layer, a protective layer, and an optical transparency layer in this order on the main surface thereof. The optical information recording medium has a main information area and a sub-information area to the inner circumferential side thereof, in which the track pitch TrB of the grooves in the sub-information area is about 0.32 ?m or less, and the depth D of the grooves and the half-band width W of the grooves satisfy a relation represented by: W?2D+70, whereby the difference between the reflectivity at the land surface and the reflectivity at the groove surface in the sub-information area can be restricted to less than 30%, thereby preventing occurrence of mis-decipherment for BCA marks.Type: ApplicationFiled: February 8, 2008Publication date: August 21, 2008Applicant: Taiyo Yuden Co., Ltd.Inventors: Isao Matsuda, Fumi Hara, Takeshi Otsu, Motomitsu Hagiwara, Akimasa Miyata
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Publication number: 20080118698Abstract: An optical information recording medium is provided having a superior jitter property even when an organic substance is used for a recording layer. The optical information recording medium has a substrate having a penetrating hole in a central portion thereof and a spiral pre-groove provided in one surface of the substrate, a reflection layer provided on the surface of the substrate in which the pre-groove is provided, a recording layer which is provided on the reflection layer and which is composed of an organic substance including a dye, and a light transmissive cover layer provided on the recording layer. In the optical information recording medium, the cover layer has an elastic modulus of 40 MPa or less at 25° C. in an interface region facing the recording layer.Type: ApplicationFiled: November 14, 2007Publication date: May 22, 2008Inventors: Takeshi OTSU, Akimasa MIYATA, Motomitsu HAGIWARA, Isao MATSUDA, Fumi HARA, Shingo KATO, Takuo KODAIRA
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Publication number: 20080107007Abstract: An optical information recording medium includes an optical disk body including a light-transmitting substrate, a recording layer provided on a main surface of the light-transmitting substrate over a region in which pre-grooves are formed and a portion of a region in which dummy grooves are formed, and a reflecting layer provided over the recording layer and a region of the light-transmitting substrate in which the recording layer is not provided; and an ink receiving layer provided on the label surface side of the optical disc body. The dummy grooves provided in at least a portion of the region in which the dye material is not applied have a pitch larger than that of the pre-grooves, are shallower than that of the pre-grooves, or have half-width less than that of the pre-grooves.Type: ApplicationFiled: October 12, 2007Publication date: May 8, 2008Applicant: Taiyo Yuden Co., Ltd.Inventors: Takeshi Otsu, Fumi Hara, Shinichi Kojo, Atsuo Shimizu, Motomitsu Hagiwara
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Publication number: 20070258348Abstract: An optical information recording medium comprises at least a substrate on which a groove is formed in a recording area, a recording layer comprising an organic dye, and a reflective layer. The recording area has a preformat area and a data area, and the groove in the preformat area is narrower or shallower than that in the data area.Type: ApplicationFiled: April 25, 2007Publication date: November 8, 2007Applicant: Taiyo Yuden Co., Ltd.Inventors: Isao Matsuda, Toru Fujii, Yoshikazu Takagishi, Fumi Hara