Uniform Texture Patents (Class 428/848.3)
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Patent number: 10629338Abstract: Described embodiments include a system, method, and apparatus. The apparatus includes a magnetic substrate at least partially covered by a first negative-permittivity layer comprising a first plasmonic outer surface. The apparatus includes a plasmonic nanoparticle having a magnetic element at least partially covered by a second negative-permittivity layer comprising a second plasmonic outer surface. The apparatus includes a dielectric-filled gap between the first plasmonic outer surface and the second outer surface. The first plasmonic outer surface, the dielectric-filled gap, and the second plasmonic outer surface are configured to support one or more mutually coupled plasmonic excitations.Type: GrantFiled: March 1, 2017Date of Patent: April 21, 2020Assignee: Elwha LLCInventors: Gleb M. Akselrod, Roderick A. Hyde, Muriel Y. Ishikawa, Jordin T. Kare, Maiken H. Mikkelsen, Tony S. Pan, David R. Smith, Clarence T. Tegreene, Yaroslav A. Urzhumov, Charles Whitmer, Lowell L. Wood, Jr., Victoria Y. H. Wood
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Patent number: 8986859Abstract: It is an object to provide a magnetic disk substrate highly reliable to prevent the occurrence of crash failure even if a magnetic disk is rotated at high speed, and suitable for a hard disk that starts and stops by the load/unload method, and a magnetic disk using such a substrate. The representative structure of a magnetic disk substrate is a disk-shaped glass substrate 10 having a generally flat main surface 11, an end face 12, a chamfered face 13 formed between the main surface 11 and the end face 12, and an offset portion, at the periphery of the main surface 11, raised or lowered with respect to a flat surface, other than the periphery, of the main surface 11, and characterized in that the magnitude of the offset portion is approximately uniform over the entire circumference of the glass substrate 10.Type: GrantFiled: July 9, 2012Date of Patent: March 24, 2015Assignees: Hoya Corporation, Hoya Glass Disk (Thailand) Ltd.Inventors: Toshio Takizawa, Kraisorn Phandon, Kenichi Nishimori
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Patent number: 8241768Abstract: It is an object to provide a magnetic disk substrate highly reliable to prevent the occurrence of crash failure even if a magnetic disk is rotated at high speed, and suitable for a hard disk that starts and stops by the load/unload method, and a magnetic disk using such a substrate. The representative structure of a magnetic disk substrate according to this invention is a disk-shaped glass substrate 10 having a generally flat main surface 11, an end face 12, a chamfered face 13 formed between the main surface 11 and the end face 12, and an offset portion, at the periphery of the main surface 11, raised or lowered with respect to a flat surface, other than the periphery, of the main surface 11, and characterized in that the magnitude of the offset portion is approximately uniform over the entire circumference of the glass substrate 10.Type: GrantFiled: February 19, 2008Date of Patent: August 14, 2012Assignees: Hoya Corporation, Hoya Glass Disk (thailand) Ltd.Inventors: Toshio Takizawa, Kraisom Phandon, Kenichi Nishimori
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Publication number: 20120140357Abstract: In one embodiment, a method for forming a magnetic recording medium includes forming a protective layer above reading regions of a patterned magnetic recording layer and separating regions between the recording regions, wherein the protective layer forms on sides of the recording regions and partially fills the separating regions, and forming a filler layer on the protective layer, wherein the filler layer completely fills the separating regions, wherein the filler layer has an uneven upper surface. In another embodiment, a medium includes a patterned magnetic recording layer, a protective layer above the patterned magnetic recording layer and on sides of the patterned magnetic recording layer, and a filler layer positioned between the patterned magnetic recording layer in separating regions, wherein DLC of the filler layer is a lower density than DLC of the protective layer. Other systems and methods are described according to more embodiments.Type: ApplicationFiled: December 6, 2010Publication date: June 7, 2012Applicant: Hitachi Global Storage Technologies Netherlands B. V.Inventors: Hiroshi Yakushiji, Toshinori Ono, Tatsuya Hinoue
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Patent number: 8124258Abstract: There is provided a glass substrate for a magnetic disk in which a maximum height of bumps forming a roughness pattern at a period of smaller than 2 ?m is 6 nm or lower in an annular area having a width of 30 ?m on a main surface on which a magnetic recording area is formed, a number of bumps having a height of 3 nm or higher in a unit area having a circular arc length of 30 ?m within the annular area is one or less, and a difference in arithmetic average roughness between unit areas within the annular area is 0.2 nm or smaller.Type: GrantFiled: May 29, 2009Date of Patent: February 28, 2012Assignee: The Furukawa Electric Co., Ltd.Inventors: Shinpei Todo, Yasuhiro Naka
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Substrate for magnetic recording medium, magnetic recording medium, and magnetic recording apparatus
Patent number: 8059368Abstract: It is possible to improve the recording and reproducing S/N ratio, the reproduction signal intensity, and the degree of high density recording. There are provided a plurality of recording tracks formed on a substrate, each recording track being formed of a magnetic material, and non-recording sections formed on the substrate, each non-recording section separating adjacent recording tracks, each recording track including a plurality of recording sections and connecting sections for connecting the recording sections adjacent thereto in a track longitudinal direction, and each connecting section having a cross-sectional area in a track width direction that is smaller than a cross-sectional area in a track width direction of adjacent recording sections.Type: GrantFiled: June 2, 2010Date of Patent: November 15, 2011Assignee: Kabushiki Kaisha ToshibaInventors: Kaori Kimura, Masatoshi Sakurai, Akira Kikitsu, Yoshiyuki Kamata, Satoshi Shirotori, Hiroyuki Hieda -
Patent number: 7887939Abstract: An information recording medium comprises a substrate, a second recording layer, a second light transmitting layer, a first recording layer for recording different information from that to be recorded in the second recording layer, and a first light transmitting layer. The second recording layer is formed with a continuous second microscopic pattern of grooves. The first recording layer is formed with a continuous first microscopic pattern of grooves that is different from the second microscopic pattern. Both sidewalls of raised portions of the first and second microscopic patterns are formed with wobbling so as to be parallel with each other. Auxiliary information and a reference clock is recorded on these sidewalls alternately and continuously.Type: GrantFiled: March 12, 2010Date of Patent: February 15, 2011Assignee: Victor Company of Japan, LimitedInventors: Tetsuya Kondo, Kenji Oishi
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Patent number: 7709111Abstract: An information recording medium comprises a substrate, a second recording layer, a second light transmitting layer, a first recording layer for recording different information from that to be recorded in the second recording layer, and a first light transmitting layer. The second recording layer is formed with a continuous second microscopic pattern of grooves. The first recording layer is formed with a continuous first microscopic pattern of grooves that is different from the second microscopic pattern. Both sidewalls of raised portions of the first and second microscopic patterns are formed with wobbling so as to be parallel with each other. Auxiliary information and a reference clock is recorded on these sidewalls alternately and continuously.Type: GrantFiled: June 18, 2009Date of Patent: May 4, 2010Assignee: Victor Company of Japan, LimitedInventors: Tetsuya Kondo, Kenji Oishi
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Patent number: 7709110Abstract: An information recording medium comprises a substrate, a second recording layer, a second light transmitting layer, a first recording layer for recording different information from that to be recorded in the second recording layer, and a first light transmitting layer. The second recording layer is formed with a continuous second microscopic pattern of grooves. The first recording layer is formed with a continuous first microscopic pattern of grooves that is different from the second microscopic pattern. Both sidewalls of raised portions of the first and second microscopic patterns are formed with wobbling so as to be parallel with each other. Auxiliary information and a reference clock is recorded on these sidewalls alternately and continuously.Type: GrantFiled: May 4, 2009Date of Patent: May 4, 2010Assignee: Victor Company of Japan, LimitedInventors: Tetsuya Kondo, Kenji Oishi
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Patent number: 7709108Abstract: An information recording medium comprises a substrate, a second recording layer, a second light transmitting layer, a first recording layer for recording different information from that to be recorded in the second recording layer, and a first light transmitting layer. The second recording layer is formed with a continuous second microscopic pattern of grooves. The first recording layer is formed with a continuous first microscopic pattern of grooves that is different from the second microscopic pattern. Both sidewalls of raised portions of the first and second microscopic patterns are formed with wobbling so as to be parallel with each other. Auxiliary information and a reference clock is recorded on these sidewalls alternately and continuously.Type: GrantFiled: May 4, 2009Date of Patent: May 4, 2010Assignee: Victor Company of Japan, LimitedInventors: Tetsuya Kondo, Kenji Oishi
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Patent number: 7709109Abstract: An information recording medium comprises a substrate, a second recording layer, a second light transmitting layer, a first recording layer for recording different information from that to be recorded in the second recording layer, and a first light transmitting layer. The second recording layer is formed with a continuous second microscopic pattern of grooves. The first recording layer is formed with a continuous first microscopic pattern of grooves that is different from the second microscopic pattern. Both sidewalls of raised portions of the first and second microscopic patterns are formed with wobbling so as to be parallel with each other. Auxiliary information and a reference clock is recorded on these sidewalls alternately and continuously.Type: GrantFiled: May 4, 2009Date of Patent: May 4, 2010Assignee: Victor Company of Japan, LimitedInventors: Tetsuya Kondo, Kenji Oishi
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Patent number: 7709112Abstract: An information recording medium comprises a substrate, a second recording layer, a second light transmitting layer, a first recording layer for recording different information from that to be recorded in the second recording layer, and a first light transmitting layer. The second recording layer is formed with a continuous second microscopic pattern of grooves. The first recording layer is formed with a continuous first microscopic pattern of grooves that is different from the second microscopic pattern. Both sidewalls of raised portions of the first and second microscopic patterns are formed with wobbling so as to be parallel with each other. Auxiliary information and a reference clock is recorded on these sidewalls alternately and continuously.Type: GrantFiled: June 18, 2009Date of Patent: May 4, 2010Assignee: Victor Company of Japan, LimitedInventors: Tetsuya Kondo, Kenji Oishi
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Patent number: 7709107Abstract: An information recording medium comprises a substrate, a second recording layer, a second light transmitting layer, a first recording layer for recording different information from that to be recorded in the second recording layer, and a first light transmitting layer. The second recording layer is formed with a continuous second microscopic pattern of grooves. The first recording layer is formed with a continuous first microscopic pattern of grooves that is different from the second microscopic pattern. Both sidewalls of raised portions of the first and second microscopic patterns are formed with wobbling so as to be parallel with each other. Auxiliary information and a reference clock is recorded on these sidewalls alternately and continuously.Type: GrantFiled: May 4, 2009Date of Patent: May 4, 2010Assignee: Victor Company of Japan, LimitedInventors: Tetsuya Kondo, Kenji Oishi
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Publication number: 20090214897Abstract: A magnetic storage apparatus is provided with a perpendicular magnetic recording medium having a soft magnetic underlayer and a recording layer, and a magnetic head having a medium opposing surface. The soft magnetic underlayer has axes of easy magnetization oriented along a circumferential direction. A return yoke part of a recording element in the head includes return side yokes arranged in a radial direction of a main magnetic pole part on the medium opposing surface, whereby a magnetic flux of a recording magnetic field flows in the radial direction within the soft magnetic underlayer.Type: ApplicationFiled: May 4, 2009Publication date: August 27, 2009Applicant: FUJITSU LIMITEDInventor: Kenji Sato
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Patent number: 7563521Abstract: An information recording medium comprises a substrate, a second recording layer, a second light transmitting layer, a first recording layer for recording different information from that to be recorded in the second recording layer, and a first light transmitting layer. The second recording layer is formed with a continuous second microscopic pattern of grooves. The first recording layer is formed with a continuous first microscopic pattern of grooves that is different from the second microscopic pattern. Both sidewalls of raised portions of the first and second microscopic patterns are formed with wobbling so as to be parallel with each other. Auxiliary information and a reference clock is recorded on these sidewalls alternately and continuously.Type: GrantFiled: October 13, 2005Date of Patent: July 21, 2009Assignee: Victor Company of Japan, LimitedInventors: Tetsuya Kondo, Kenji Oishi
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Patent number: 7544428Abstract: An information recording medium comprises a substrate, a second recording layer, a second light transmitting layer, a first recording layer for recording different information from that to be recorded in the second recording layer, and a first light transmitting layer. The second recording layer is formed with a continuous second microscopic pattern of grooves. The first recording layer is formed with a continuous first microscopic pattern of grooves that is different from the second microscopic pattern. Both sidewalls of raised portions of the first and second microscopic patterns are formed with wobbling so as to be parallel with each other. Auxiliary information and a reference clock is recorded on these sidewalls alternately and continuously.Type: GrantFiled: October 13, 2005Date of Patent: June 9, 2009Assignee: Victor Company of Japan, LimitedInventors: Tetsuya Kondo, Kenji Oishi
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Patent number: 7465383Abstract: A master information carrier for magnetic transfer includes a master substrate made of metal, including an embossed pattern corresponding to information to be transferred. The master substrate is produced by laminating a metal disk with a predetermined thickness on an original disk, on which an embossed pattern is formed, by electroforming, peeling off the metal disk and die-cutting a disk in a desired size. An outer diameter of the metal disk is at least 1.7 times longer than an outer diameter of the die-cut master substrate. When the metal disk is peeled off from the original disk, deformation due to the forces acting from the side of the outer circumference is reduced. The flatness of the metal disk is ensured and the transfer qualities are improved. Further, a step of removing distortion of the metal disk, caused at the time of peeling off the metal disk, may also be provided.Type: GrantFiled: April 12, 2005Date of Patent: December 16, 2008Assignee: FUJIFILM CorporationInventors: Kazuhiro Niitsuma, Masakazu Nishikawa, Tadashi Yasunaga
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Patent number: 7220447Abstract: A process for producing a magnetic recording medium, which process comprises a texturing step for forming texture grooves having a line density of 7,500 lines/mm or more on the surface of a non-metallic substrate, and a step for forming an orientation-determining film, a non-magnetic undercoat layer, and a magnetic layer on the non-metallic substrate.Type: GrantFiled: September 30, 2004Date of Patent: May 22, 2007Assignee: Showa Denko K.K.Inventors: Masato Fukushima, Ryuji Sakaguchi, Yukihisa Matsumura
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Patent number: 7179551Abstract: A storage media comprises: a substrate comprising a plastic resin portion, wherein to plastic resin portion comprises poly(arylene ether) and a styrene material selected from the group consisting of polystyrene, styrenic copolymer(s), and reaction products and combinations comprising at least one of the foregoing styrene material(s), and a data layer on the substrate. The data layer can be at least partly read from, written to, or a combination thereof by an energy field. Additionally, when the energy field contacts the storage media, the energy field is incident upon the data layer before it could be incident upon the substrate.Type: GrantFiled: March 11, 2002Date of Patent: February 20, 2007Assignee: General Electric CompanyInventors: Thomas Paul Feist, Kevin Hsingtao Dai, Glen David Merfeld
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Patent number: 7138193Abstract: An information storage medium with an array of laterally magnetized dots, as well as a process for producing this medium is disclosed. Each dot (2) contains at least one magnetic domain formed by a thin layer (4) of at least a magnetic material laterally covering this flat material and deposited at oblique incidence relative to the normal (z) to the plane (6) of the array. The invention applies in particular to computer hard drives.Type: GrantFiled: July 2, 2002Date of Patent: November 21, 2006Assignee: Commissariat A l'Energie AtomiqueInventors: Bernard Rodmacq, Stéphane Landis, Bernard Dieny
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Patent number: 7067207Abstract: A magnetic recording medium includes a non-magnetic substrate; a soft magnetic layer which is formed on the non-magnetic substrate and which includes projected parts arranged on the surface thereof and recessed parts surrounding each of the projected part; and a ferromagnetic layer which is formed on the soft magnetic layer and which includes projected parts and recessed parts reflecting the projected parts and the recessed parts of the soft magnetic layer. Further the magnetic recording medium includes recording areas which have perpendicular magnetic anisotropy and ferromagnetism, and which are formed of the projected parts of the ferromagnetic layer and separated magnetically from their surroundings.Type: GrantFiled: November 7, 2003Date of Patent: June 27, 2006Assignee: Kabushiki Kaisha ToshibaInventors: Yoshiyuki Kamata, Masatoshi Sakurai, Akira Kikitsu
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Patent number: 7052786Abstract: A magnetic disk having a low surface microwaviness at a scale of about 200 microns and higher, and a high surface roughness at a scale of less than about a length of a pad of a slider for writing to the disk.Type: GrantFiled: January 14, 2004Date of Patent: May 30, 2006Assignee: Hitachi Global StorageTechnologies Netherlands B.V.Inventors: Donald Ray Gillis, Remmelt Pit, Vedantham Raman, Reinhard F. Wolter
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Patent number: 6982127Abstract: An information recording medium comprises a substrate, a second recording layer, a second light transmitting layer, a first recording layer for recording different information from that to be recorded in the second recording layer, and a first light transmitting layer. The second recording layer is formed with a continuous second microscopic pattern of grooves. The first recording layer is formed with a continuous first microscopic pattern of grooves that is different from the second microscopic pattern. Both sidewalls of raised portions of the first and second microscopic patterns are formed with wobbling so as to be parallel with each other. Auxiliary information and a reference clock is recorded on these sidewalls alternately and continuously.Type: GrantFiled: June 4, 2003Date of Patent: January 3, 2006Assignee: Victor Company of Japan, Ltd.Inventors: Tetsuya Kondo, Kenji Oishi