Patents by Inventor Hideaki Yamanaka
Hideaki Yamanaka 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: 8719674Abstract: A communication apparatus realizes an FEC function. In the communication apparatus, a T_FEC-pattern comparing unit calculates a code distance between a pattern of an input FEC frame falling in a certain detection window and the pre-defined T_FEC pattern for each of the detection windows one after another. Moreover, a code-distance comparing unit compares the code distances with each other to detect a code for boundary identification T_FEC between an IEEE802.3 frame and a FEC parity. Finally, a boundary-signal generating unit generates, based on the detected code for boundary identification T_FEC, a T_FEC boundary signal that indicates a detection position of the T_FEC in the input FEC frame.Type: GrantFiled: June 26, 2006Date of Patent: May 6, 2014Assignee: Mitsubishi Electric CorporationInventors: Koji Takahashi, Seiji Kozaki, Hideaki Yamanaka
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Patent number: 7670131Abstract: The invention provides an imprinting jig for transferring a pattern onto a thermoplastic sheet. The imprinting jig is provided with: a first die having a surface with a pattern; a die holder for supporting the first die; an elastic member placed between the first die and the die holder; and a second die opposing to the first die. The thermoplastic sheet is placed on the surface with the pattern of the first die. The imprinting jig optionally includes an adhesion reducing means between the elastic member and the first die or between the elastic member and the die holder.Type: GrantFiled: March 12, 2008Date of Patent: March 2, 2010Assignee: Hitachi Maxell, Ltd.Inventors: Hiroyuki Kishi, Hideaki Yamanaka
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Publication number: 20090254793Abstract: A communication apparatus realizes an FEC function. In the communication apparatus, a T_FEC-pattern comparing unit calculates a code distance between a pattern of an input FEC frame falling in a certain detection window and the pre-defined T_FEC pattern for each of the detection windows one after another. Moreover, a code-distance comparing unit compares the code distances with each other to detect a code for boundary identification T_FEC between an IEEE802.3 frame and a FEC parity. Finally, a boundary-signal generating unit generates, based on the detected code for boundary identification T_FEC, a T_FEC boundary signal that indicates a detection position of the T_FEC in the input FEC frame.Type: ApplicationFiled: June 26, 2006Publication date: October 8, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Koji Takahashi, Seiji Kozaki, Hideaki Yamanaka
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Publication number: 20080247550Abstract: In a PON system, clocks of an optical network unit and an optical line terminal are synchronized. An optical network unit generates a new encryption key and transmits it to an optical line terminal. The optical network unit transmits a notification that includes an encryption key changing time to the optical line terminal. Finally, the optical network unit and the optical line terminal change previously held encryption keys to the new encryption key at the encryption key changing time.Type: ApplicationFiled: May 14, 2004Publication date: October 9, 2008Inventors: Seiji Kozaki, Ken Murakami, Hiroyuki Tanaka, Yoshifumi Hotta, Hideaki Yamanaka
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Publication number: 20080241307Abstract: The invention provides an imprinting jig for transferring a pattern onto a thermoplastic sheet. The imprinting jig is provided with: a first die having a surface with a pattern; a die holder for supporting the first die; an elastic member placed between the first die and the die holder; and a second die opposing to the first die. The thermoplastic sheet is placed on the surface with the pattern of the first die. The imprinting jig optionally includes an adhesion reducing means between the elastic member and the first die or between the elastic member and the die holder.Type: ApplicationFiled: March 12, 2008Publication date: October 2, 2008Applicant: HITACHI MAXELL, LTD.Inventors: Hiroyuki Kishi, Hideaki Yamanaka
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Patent number: 7348077Abstract: A magnetic recording medium based on the perpendicular magnetic recording system includes a substrate; a back layer which is formed on the substrate and which is formed of a soft magnetic material; an in-plane magnetized layer which is formed on the back layer and which has in-plane magnetization; and a recording layer which is formed on the in-plane magnetized layer and which has perpendicular magnetization, wherein the in-plane magnetized layer has a coercivity in an in-plane direction larger than a magnetic field generated by residual magnetization in a perpendicular direction of the recording layer. The influence on the reproduction output, caused by the mirror image effect of the soft magnetic back layer is reduced in wide range recording densities, thereby improving the resolution by decreasing the difference between the reproduction outputs of the magnetic recording medium at the low recording density and at the high recording density.Type: GrantFiled: September 1, 2004Date of Patent: March 25, 2008Assignee: Hitachi Maxwell LtdInventors: Enji Fujita, Hideaki Yamanaka, Tsuyoshi Onuma, Satoshi Matsunuma, Akira Yano, Tetsunori Koda, Katsusuke Shimazaki
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Publication number: 20070130578Abstract: In order to reduce local deflection mainly caused by static electricity generated on a flexible disk which is capable of optical recording and reproducing and is mounted on an attitude control plate, and to perform stable focusing in the optical recording and reproducing, according to the present invention, a spacer is incorporated into the attitude control plate having a penetrating vents for air inflow, the flexible disk capable of the optical recording and reproducing is mounted to rotate integrally to generate a stable air flow in a gap secured between the flexible disk and the attitude control plate so as to equilibrate a force due to the air flow and gravity and a centrifugal force of the flexible disk, and electrostatic repulsion, so that a stably balanced state of the flexible disk is maintained.Type: ApplicationFiled: June 7, 2006Publication date: June 7, 2007Inventors: Hiroshi Ido, Manabu Tani, Hideaki Yamanaka, Yoshiaki Inamura
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Patent number: 7226674Abstract: A magnetic recording medium based on the perpendicular magnetic recording system has a substrate which is formed of a non-magnetic material, a soft magnetic back layer which is formed of a soft magnetic material and which is formed on the substrate, an underlayer which is formed on the soft magnetic back layer, and a recording layer which is formed of an alloy magnetic material which is mainly composed of CoPtCr and contains an oxide, and which is formed on the underlayer. The recording layer is formed of two or more magnetic layers having different oxide contents, and the layer, which is included in the two or more magnetic layers for constructing the recording layer and which is provided on a side nearest to the underlayer, has the highest oxide content in the recording layer. The magnetic recording medium has more excellent magnetic characteristics with less medium noise.Type: GrantFiled: January 28, 2004Date of Patent: June 5, 2007Assignee: Hitachi Maxell, Ltd.Inventors: Tetsunori Koda, Hideaki Yamanaka, Enji Fujita, Satoshi Matsunuma
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Patent number: 7154715Abstract: A magnetic transducing element in which a ferromagnetic tunneling junction film, including first and second ferromagnetic layers and an insulating layer are enclosed between the ferromagnetic layers, and a nonmagnetic metal thin film is inserted between the second ferromagnetic layer and the insulating layer, is formed on a substrate.Type: GrantFiled: September 26, 2002Date of Patent: December 26, 2006Assignee: Western Digital (Fremont), Inc.Inventors: Hideaki Yamanaka, Kesami Saito, Koki Takanashi, Hiroyasu Fujimori
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Patent number: 7076563Abstract: An optical network unit of each consumer is connected to an optical line terminator of a network operator through a subscriber line formed of an optical fiber. When a particular consumer desires to download digital content from a content retailer to the particular consumer through a network of the network operator, the particular consumer requests a bandwidth reservation of a resource reservation server of the network operator, so that a transmission condition composed of a bandwidth and a time zone is reserved in cases where the downloading of the digital content at the transmission condition is possible. Thereafter, the bandwidth reservation is sent to a downward bandwidth managing unit, and the digital content is downloaded from the content retailer to the particular consumer through the network of the network operator at the transmission condition according to the bandwidth reservation under control of the downward bandwidth managing unit.Type: GrantFiled: October 17, 2000Date of Patent: July 11, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hideaki Yamanaka, Teruhiko Moriyama, Katsuaki Kikuchi
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Patent number: 7072861Abstract: In cases where a consumer desires to receive digital content from a digital content retailer through a network, information designating the digital content and a digital content transmission condition such as a transfer rate and a transmission time-zone are sent to the digital content retailer through the network. The digital content retailer reserves the transfer rate and the transmission time-zone in the network and downloads the digital content to the consumer through the network at the digital content transmission condition according to the reservation. After the downloading of the digital content is completed, the consumer pays a charge for the digital content itself and a transmission charge corresponding to the digital content transmission condition to a credit company, the credit company pays the charges to the digital content retailer, and the digital content retailer pays the transmission charge to a network operator managing the network.Type: GrantFiled: October 20, 2000Date of Patent: July 4, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hideaki Yamanaka, Teruhiko Moriyama, Katsuaki Kikuchi
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Patent number: 6866948Abstract: A magnetic recording medium based on the perpendicular recording system, which has high coercivity and low medium noise, is provided by using an underlayer which has a thin film thickness and which makes it possible to improve the orientation of a recording layer. The magnetic recording medium based on the perpendicular recording system has the recording layer which is formed of a CoPtCr alloy magnetic film containing oxygen. The magnetic recording medium has such a structure that an adhesive layer 2, a soft magnetic back layer 3, the underlayer 4, the recording layer 5, and a protective layer 6 are successively stacked on a substrate 1. A CoCrRu film, which has a film thickness of 5 nm to 20 nm, is used as the underlayer for the recording layer formed of the CoPtCr alloy magnetic film containing oxygen. Thus, it is possible to improve the crystalline orientation of the recording layer with the underlayer having the thin film thickness.Type: GrantFiled: September 22, 2003Date of Patent: March 15, 2005Assignee: Hitachi Maxell, Ltd.Inventors: Tetsunori Koda, Hideaki Yamanaka, Enji Fujita, Satoshi Matsunuma
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Patent number: 6863998Abstract: A magnetic recording medium 100 comprises, on a substrate 1, a first orientation control layer 2, a second orientation control layer 4, a soft magnetic layer 6, a non-magnetic layer 8, a recording layer 12, and a carbon protective layer 14. The recording layer 12 is formed of an FePt ordered alloy phase which exhibits ferromagnetism and an FePt3 ordered alloy phase which exhibits paramagnetism. Accordingly, the magnetic coupling force, which acts between those of the FePt ordered alloy phase, is broken by the paramagnetic FePt3 ordered alloy phase. The magnetic interaction between those of the FePt ordered alloy phase is reduced, and thus the noise is reduced. Further, the high density recording can be performed, and the medium is excellent in thermal stability, because the FePt ordered alloy having high crystalline magnetic anisotropy is used for the recording layer 12.Type: GrantFiled: December 2, 2002Date of Patent: March 8, 2005Assignee: Hitachi Maxell, Ltd.Inventors: Tetsunori Koda, Nobuyuki Inaba, Hideaki Yamanaka, Enji Fujita, Satoshi Matsunuma
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Publication number: 20050048321Abstract: A magnetic recording medium based on the perpendicular magnetic recording system includes a substrate; a back layer which is formed on the substrate and which is formed of a soft magnetic material; an in-plane magnetized layer which is formed on the back layer and which has in-plane magnetization; and a recording layer which is formed on the in-plane magnetized layer and which has perpendicular magnetization, wherein the in-plane magnetized layer has a coercivity in an in-plane direction larger than a magnetic field generated by residual magnetization in a perpendicular direction of the recording layer. The influence on the reproduction output, caused by the mirror image effect of the soft magnetic back layer is reduced in wide range recording densities, thereby improving the resolution by decreasing the difference between the reproduction outputs of the magnetic recording medium at the low recording density and at the high recording density.Type: ApplicationFiled: September 1, 2004Publication date: March 3, 2005Applicant: HITACHI MAXELL, LTD.Inventors: Enji Fujita, Hideaki Yamanaka, Tsuyoshi Onuma, Satoshi Matsunuma, Akira Yano, Tetsunori Koda, Katsusuke Shimazaki
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Patent number: 6846583Abstract: A magnetic recording medium comprises a magnetic recording layer 63 which is formed by using an ordered alloy containing B on a substrate 1 containing an amorphous component. A part of B in the ordered alloy is segregated in a grain boundary, and thus the magnetic interaction, which acts between magnetic grains, can be reduced. Accordingly, it is possible to form fine and minute magnetic domains in the magnetic recording layer 63, and it is possible to reduce the medium noise as well. The temperature, at which the substrate is heated during the film formation of the magnetic recording layer 63, can be suppressed to be low, because the ordering temperature for the ordered alloy containing B is lower than those of ordered alloys not containing B. Therefore, it is possible to use a substrate made of glass which is suitable for the mass production. The magnetic recording layer 63 is also excellent in thermal stability because of the use of the ordered alloy having high magnetic anisotropy.Type: GrantFiled: February 3, 2003Date of Patent: January 25, 2005Assignee: Hitachi Maxell, Ltd.Inventors: Nobuyuki Inaba, Tetsunori Kouda, Hideaki Yamanaka, Satoshi Matsunuma, Enji Fujita
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Publication number: 20040241500Abstract: The object of the present invention is to provide an artificial lattice multilayer film medium having both the excellent signal-noise ratio (S/N) and the high coercive force and demagnetization resistance by reconciling the reduction of transition noise and the high magnetic anisotropy, and a magnetic storage device having a high S/N and a high demagnetization resistance even at a high areal recording density by using the artificial lattice multilayer film medium. The magnetic recording medium of the present invention is a magnetic recording medium comprising at least a soft magnetic layer, a seed layer and a recording layer having a multilayer film structure comprising alternately laminated Co and Pd, these layers being successively laminated on a nonmagnetic substrate, where the recording layer comprises an aggregate of fcc crystal grains, the average value of (111) interplanar spacing of the fcc crystals is not more than 2.Type: ApplicationFiled: April 22, 2004Publication date: December 2, 2004Inventors: Akira Yano, Hideaki Yamanaka, Tsuyoshi Onuma, Satoshi Matsunuma
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Publication number: 20040185308Abstract: A magnetic recording medium based on the perpendicular magnetic recording system has a substrate which is formed of a non-magnetic material, a soft magnetic back layer which is formed of a soft magnetic material and which is formed on the substrate, an underlayer which is formed on the soft magnetic back layer, and a recording layer which is formed of an alloy magnetic material which is mainly composed of CoPtCr and contains an oxide, and which is formed on the underlayer. The recording layer is formed of two or more magnetic layers having different oxide contents, and the layer, which is included in the two or more magnetic layers for constructing the recording layer and which is provided on a side nearest to the underlayer, has the highest oxide content in the recording layer. The magnetic recording medium has more excellent magnetic characteristics with less medium noise.Type: ApplicationFiled: January 28, 2004Publication date: September 23, 2004Applicant: HITACHI MAXELL, LTD.Inventors: Tetsunori Koda, Hideaki Yamanaka, Enji Fujita, Satoshi Matunuma
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Publication number: 20040067390Abstract: A magnetic recording medium based on the perpendicular recording system, which has high coercivity and low medium noise, is provided by using an underlayer which has a thin film thickness and which makes it possible to improve the orientation of a recording layer. The magnetic recording medium based on the perpendicular recording system has the recording layer which is formed of a CoPtCr alloy magnetic film containing oxygen. The magnetic recording medium has such a structure that an adhesive layer 2, a soft magnetic back layer 3, the underlayer 4, the recording layer 5, and a protective layer 6 are successively stacked on a substrate 1. A CoCrRu film, which has a film thickness of 5 nm to 20 nm, is used as the underlayer for the recording layer formed of the CoPtCr alloy magnetic film containing oxygen. Thus, it is possible to improve the crystalline orientation of the recording layer with the underlayer having the thin film thickness.Type: ApplicationFiled: September 22, 2003Publication date: April 8, 2004Applicant: HITACHI MAXELL, LTDInventors: Tetsunori Koda, Hideaki Yamanaka, Enji Fujita, Satoshi Matsunuma
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Publication number: 20030215675Abstract: A magnetic recording medium comprises a magnetic recording layer 63 which is formed by using an ordered alloy containing B on a substrate 1 containing an amorphous component. A part of B in the ordered alloy is segregated in a grain boundary, and thus the magnetic interaction, which acts between magnetic grains, can be reduced. Accordingly, it is possible to form fine and minute magnetic domains in the magnetic recording layer 63, and it is possible to reduce the medium noise as well. The temperature, at which the substrate is heated during the film formation of the magnetic recording layer 63, can be suppressed to be low, because the ordering temperature for the ordered alloy containing B is lower than those of ordered alloys not containing B. Therefore, it is possible to use a substrate made of glass which is suitable for the mass production. The magnetic recording layer 63 is also excellent in thermal stability because of the use of the ordered alloy having high magnetic anisotropy.Type: ApplicationFiled: February 3, 2003Publication date: November 20, 2003Applicant: Hitachi Maxell, Ltd.Inventors: Nobuyuki Inaba, Tetsunori Kouda, Hideaki Yamanaka, Satoshi Matsunuma, Enji Fujita
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Patent number: 6597548Abstract: A magnetic transducing element in which a ferromagnetic tunneling junction film, including first and second ferromagnetic layers and an insulating layer are enclosed between the ferromagnetic layers, and a nonmagnetic metal thin film is inserted between the second ferromagnetic layer and the insulating layer, is formed on a substrate.Type: GrantFiled: June 4, 1999Date of Patent: July 22, 2003Assignee: Read-Rite SMI CorporationInventors: Hideaki Yamanaka, Kesami Saito, Koki Takanashi, Hiroyasu Fujimori