Patents by Inventor Hiroaki Nemoto
Hiroaki Nemoto 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).
-
Patent number: 6773826Abstract: A perpendicular magnetic recording medium and a magnetic storage apparatus, which show an excellent S/N ratio and are suitable for ultra high density magnetic recording, are provided. In the perpendicular magnetic recording medium having a recording layer composed of at least two layers of a main recording layer formed above a substrate and a thermally-stabilizing layer formed on the main recording layer, the thermally-stabilizing layer being formed closer to a surface of the medium than the main recording layer, alloy containing Co and Cr as a main component, which shows a low noise property, is used as the main recording layer, amorphous alloy containing rare earth metals and 3d transition metals as a main component, which is excellent in thermal stability, is used as the thermally-stabilizing layer, and a cap layer formed of alloy containing Co and Cr as a main component is formed on a surface of the thermally-stabilizing layer.Type: GrantFiled: February 19, 2002Date of Patent: August 10, 2004Assignee: Hitachi, Ltd.Inventors: Hiroyuki Nakagawa, Hiroaki Nemoto, Yuzuru Hosoe
-
Publication number: 20040146747Abstract: Co/Pd or Co/Pt superlattice is provided to enable magnetic recording devices to sustain good recording/readback performances across a wide range of temperatures. Such a superlattice medium includes a substrate and a magnetic layer formed on the substrate and the magnetic layer comprises multilayer superlattice films of ferromagnetic metal layers which contain Co and paramagnetic metal layers which consist of Pd and/or Pt, wherein the ferromagnetic metal layers further contain a paramagnetic element and the thickness of the paramagnetic metal layers is 0.8 nm or less. When a magnetic torque loop of the perpendicular magnetic recording medium is measured with a torque magnetometer, the polarity of a value of loop components with translational symmetry of 90 degrees should be opposite to the polarity of a value of loop components with translational symmetry of 180 degrees.Type: ApplicationFiled: July 10, 2003Publication date: July 29, 2004Applicant: Hitachi, Ltd.Inventors: Hiroaki Nemoto, Ikuko Takekuma, Yuzuru Hosoe, Hiroyuki Nakagawa, Masukazu Igarashi
-
Publication number: 20040064934Abstract: Magnetic heads capable of recording and reading with high sensitivity and resolution are provided by minimizing the outflow of magnetic fluxes from a flux guide to magnetic shields while using a flux guide structure for an MR element. In the magnetic head, magnetic shields exposed on a surface opposite a magnetic recording medium (air bearing surface) and a flux guide exposed between the magnetic heads via a non-magnetic layer are provided, and magnetic heads via a non-magnetic layer are provided, and magnetic fluxes are guided by the flux guide to a magnetoresistive (MR) element formed in a position not exposed on the air bearing surface. The height of the magnetic shields in a direction perpendicular to the air bearing surface is less than the distance from the air bearing surface to the MR element, and the lengthwise direction of the magnetic shields is in parallel to the air bearing surface in the vicinity of the position in which the flux guide is formed.Type: ApplicationFiled: October 7, 2003Publication date: April 8, 2004Applicant: Hitachi, Ltd.Inventor: Hiroaki Nemoto
-
Publication number: 20040038083Abstract: A perpendicular magnetic recording medium includes an intermediate film formed of a plurality of layers between a soft magnetic film and a perpendicular magnetization film. The intermediate film includes at least two layers, i.e., an oxygen-containing layer, or a nonmetallic element-containing layer containing nitrogen, silicon or carbon, and a metallic layer formed on a surface side of the oxygen-containing layer or the nonmetallic element-containing layer. The metallic layer includes a plurality of isolated island-shaped structures. Crystal grains of the perpendicular magnetization film are formed so as to correspond to the isolated island-shaped structures. As a result, a high recording density is obtained.Type: ApplicationFiled: February 25, 2003Publication date: February 26, 2004Applicant: Hitachi, Ltd.Inventors: Yoshiyuki Hirayama, Hiroyuki Nakagawa, Hiroaki Nemoto, Ichiro Tamai, Ikuko Takekuma
-
Patent number: 6683823Abstract: A method for reproducing information on a recording medium includes irradiating electromagnetic energy or light to the recording medium from one side with respect to the recording medium, applying a recording magnetic field to an electromagnetic energy or light irradiated position on the recording medium from the one side of irradiating electromagnetic energy or light, and detecting magnetic leakage flux emerging from the recording medium from the one side of irradiating electromagnetic energy or light.Type: GrantFiled: December 17, 2002Date of Patent: January 27, 2004Assignee: Hitachi, Ltd.Inventors: Hideki Saga, Hiroaki Nemoto, Hirofumi Sukeda, Masahiko Takahashi, Kimio Nakamura, Yohji Maruyama, Hiroshi Ide, Takehiko Hamaguchi
-
Patent number: 6665152Abstract: Magnetic heads capable of recording and reading with high sensitivity and resolution are provided by minimizing the outflow of magnetic fluxes from a flux guide to magnetic shields while using a flux guide structure for an MR element. In the magnetic head, magnetic shields exposed on a surface opposite a magnetic recording medium (air bearing surface) and a flux guide exposed between the magnetic heads via a non-magnetic layer are provided, and magnetic fluxes are guided by the flux guide to a magnetoresistive (MR) element formed in a position not exposed on the air bearing surface. The height of the magnetic shields in a direction perpendicular to the air bearing surface is less than the distance from the air bearing surface to the MR element, and the lengthwise direction of the magnetic shields is in parallel to the air bearing surface in the vicinity of the position in which the flux guide is formed.Type: GrantFiled: August 3, 2001Date of Patent: December 16, 2003Assignee: Hitachi, Ltd.Inventor: Hiroaki Nemoto
-
Publication number: 20030162041Abstract: A perpendicular magnetic recording medium, which has a low level of recording noise and sufficiently large perpendicular magnetic anisotropy energy relative to demagnetizing field energy, includes a substrate and a multi-layered magnetic film. The multi-layered magnetic film is composed of ferromagnetic metal layers of Co alloy containing at least Cr and non-magnetic metal layers of Pd alloy, each one layer of which are laminated alternately on top of one layer of the other. The ferromagnetic metal layers and the non-magnetic metal layers have a thickness of d1 and d2, respectively, with the ratio of d1/d2 being in the range of 1.5 to 4.0. This specific layer structure reduces the magnetic exchange interaction between magnetic particles in the multi-layered magnetic film. Therefore, the perpendicular magnetic recording medium is stable against thermal disturbance and has a low level of recording noise.Type: ApplicationFiled: August 14, 2002Publication date: August 28, 2003Inventors: Hiroaki Nemoto, Hiroyuki Nakagawa, Yuzuru Hosoe
-
Publication number: 20030123333Abstract: A method for reproducing information on a recording medium includes irradiating electromagnetic energy or light to the recording medium from one side with respect to the recording medium, applying a recording magnetic field to an electromagnetic energy or light irradiated position on the recording medium from the one side of irradiating electromagnetic energy or light, and detecting magnetic leakage flux emerging from the recording medium from the one side of irradiating electromagnetic energy or light.Type: ApplicationFiled: December 17, 2002Publication date: July 3, 2003Inventors: Hideki Saga, Hiroaki Nemoto, Hirofumi Sukeda, Masahiko Takahashi, Kimio Nakamura, Yohji Maruyama, Hiroshi Ide, Takehiko Hamaguchi
-
Patent number: 6572963Abstract: A process for forming an inorganic material layer pattern on a substrate. The process includes the steps of transferring an inorganic powder dispersed paste layer supported on a support film to the surface of the substrate to form the inorganic powder dispersed paste layer on the substrate; forming a resist film on the inorganic powder dispersed paste layer transferred to the surface of the substrate; exposing the resist film to light through a mask to form a latent image of a resist pattern; developing the exposed resist film to form the resist pattern; etching exposed portions of the inorganic powder dispersed paste layer to form an inorganic powder dispersed paste layer pattern corresponding to the resist pattern; and baking the pattern to form an inorganic material layer pattern.Type: GrantFiled: October 17, 2001Date of Patent: June 3, 2003Assignee: JSR CorporationInventors: Hideaki Masuko, Tadahiko Udagawa, Hiroaki Nemoto, Nobuo Bessho
-
Patent number: 6560168Abstract: An information recording apparatus using a recording medium which holds information by reversed magnetic domains on a perpendicular magnetic recording film includes an irradiation unit for applying electromagnetic energy or light onto the recording medium, and a magnetic flux detection unit for detecting magnetic leakage flux emerging from the recording medium, the magnetic flux detection unit being disposed on the same side as the irradiation unit with respect to the recording medium. As a result, both side recording of the recording medium can be conducted.Type: GrantFiled: December 12, 2000Date of Patent: May 6, 2003Assignee: Hitachi, Ltd.Inventors: Hideki Saga, Hiroaki Nemoto, Hirofumi Sukeda, Masahiko Takahashi, Kimio Nakamura, Yohji Maruyama, Hiroshi Ide, Takehiko Hamaguchi
-
Publication number: 20030059650Abstract: A perpendicular magnetic recording medium and a magnetic storage apparatus, which show an excellent S/N ratio and are suitable for ultra high density magnetic recording, are provided. In the perpendicular magnetic recording medium having a recording layer composed of at least two layers of a main recording layer formed above a substrate and a thermally-stabilizing layer formed on the main recording layer, the thermally-stabilizing layer being formed closer to a surface of the medium than the main recording layer, alloy containing Co and Cr as a main component, which shows a low noise property, is used as the main recording layer, amorphous alloy containing rare earth metals and 3d transition metals as a main component, which is excellent in thermal stability, is used as the thermally-stabilizing layer, and a cap layer formed of alloy containing Co and Cr as a main component is formed on a surface of the thermally-stabilizing layer.Type: ApplicationFiled: February 19, 2002Publication date: March 27, 2003Inventors: Hiroyuki Nakagawa, Hiroaki Nemoto, Yuzuru Hosoe
-
Publication number: 20030049412Abstract: A process for forming an inorganic material layer pattern on a substrate. The process includes the steps of transferring an inorganic powder dispersed paste layer supported on a support film to the surface of the substrate to form the inorganic powder dispersed paste layer on the substrate; forming a resist film on the inorganic powder dispersed paste layer transferred to the surface of the substrate; exposing the resist film to light through a mask to form a latent image of a resist pattern; developing the exposed resist film to form the resist pattern; etching exposed portions of the inorganic powder dispersed paste layer to form an inorganic powder dispersed paste layer pattern corresponding to the resist pattern; and baking the pattern to form an inorganic material layer pattern.Type: ApplicationFiled: October 23, 2002Publication date: March 13, 2003Applicant: JSR CORPORATIONInventors: Hideaki Masuko, Tadahiko Udagawa, Hiroaki Nemoto, Nobuo Bessho
-
Publication number: 20020141118Abstract: Magnetic heads capable of recording and reading with high sensitivity and resolution are provided by minimizing the outflow of magnetic fluxes from a flux guide to magnetic shields while using a flux guide structure for an MR element. In the magnetic head, magnetic shields exposed on a surface opposite a magnetic recording medium (air bearing surface) and a flux guide exposed between the magnetic heads via a non-magnetic layer are provided, and magnetic fluxes are guided by the flux guide to a magnetoresistive (MR) element formed in a position not exposed on the air bearing surface. The height of the magnetic shields in a direction perpendicular to the air bearing surface is less than the distance from the air bearing surface to the MR element, and the lengthwise direction of the magnetic shields is in parallel to the air bearing surface in the vicinity of the position in which the flux guide is formed.Type: ApplicationFiled: August 3, 2001Publication date: October 3, 2002Applicant: Hitachi, Ltd.Inventor: Hiroaki Nemoto
-
Patent number: 6368774Abstract: A radiation sensitive composition comprising (A), a mixture of an isoindolinone pigment and a yellow organic pigment, (B) an alkali-soluble resin, (C) a polyfunctional monomer and (D) a photopolymerization initiator. The composition is useful for production of an additive or subtractive color filter which is used in a reflection-type color liquid crystal display device.Type: GrantFiled: June 2, 2000Date of Patent: April 9, 2002Assignee: JSR CorporationInventors: Kouichi Sakurai, Hiroaki Nemoto, Atsushi Kumano
-
Publication number: 20020034611Abstract: A process for forming an inorganic material layer pattern on a substrate. The process includes the steps of transferring an inorganic powder dispersed paste layer supported on a support film to the surface of the substrate to form the inorganic powder dispersed paste layer on the substrate; forming a resist film on the inorganic powder dispersed paste layer transferred to the surface of the substrate; exposing the resist film to light through a mask to form a latent image of a resist pattern; developing the exposed resist film to form the resist pattern; etching exposed portions of the inorganic powder dispersed paste layer to form an inorganic powder dispersed paste layer pattern corresponding to the resist pattern; and baking the pattern to form an inorganic material layer pattern.Type: ApplicationFiled: October 17, 2001Publication date: March 21, 2002Applicant: JSR CORPORATION, A JAPANESE CORPORATIONInventors: Hideaki Masuko, Tadahiko Udagawa, Hiroaki Nemoto, Nobuo Bessho
-
Patent number: 6348298Abstract: A radiation sensitive composition comprising (A) a colorant containing a quinacridone pigment, a mixture of an isoindolinone pigment and a yellow organic pigment or a mixture of copper phthalocyanine blue and a green pigment, (B) an alkali-soluble resin, (C) a polyfunctional monomer and (D) a photopolymerization initiator. The composition is useful for production of an additive or subtractive color filter which is used in a reflection-type color liquid crystal display device.Type: GrantFiled: June 2, 2000Date of Patent: February 19, 2002Assignee: JSR CorporationInventors: Kouichi Sakurai, Hiroaki Nemoto, Atsushi Kumano
-
Patent number: 6337028Abstract: A process for forming an inorganic material layer pattern on a substrate. The process includes the steps of transferring an inorganic powder dispersed paste layer supported on a support film to the surface of the substrate to form the inorganic powder dispersed paste layer on the substrate; forming a resist film on the inorganic powder dispersed paste layer transferred to the surface of the substrate; exposing the resist film to light through a mask to form a latent image of a resist pattern; developing the exposed resist film to form the resist pattern; etching exposed portions of the inorganic powder dispersed paste layer to form an inorganic powder dispersed paste layer pattern corresponding to the resist pattern; and baking the pattern to form an inorganic material layer pattern.Type: GrantFiled: November 10, 1998Date of Patent: January 8, 2002Assignee: JSR CorporationInventors: Hideaki Masuko, Tadahiko Udagawa, Hiroaki Nemoto, Nobuo Bessho
-
Patent number: 6299785Abstract: A process for the preparation of an electrode, which comprises: (1) transferring a conductive paste layer supported on a base film to a substrate to form the conductive paste layer on the substrate; (2) forming a resist film on the conductive paste layer transferred to the substrate; (3) exposing the resist film through a mask to form a resist pattern latent image; (4) developing the exposed resist film to form a resist pattern; (5) etching exposed portions of the conductive paste layer to form a conductive paste layer pattern corresponding to the resist pattern; and (6) thermosetting the pattern to form a conductive layer pattern.Type: GrantFiled: April 22, 1999Date of Patent: October 9, 2001Assignee: JSR CorporationInventors: Tsutomu Shimokawa, Hideaki Masuko, Hiroaki Nemoto, Nobuo Bessho
-
Patent number: 6288981Abstract: In an optical recording and magnetic-head reproducing system, the reproduced output is prevented from starting to decrease, upon the length of record bits getting shorter, in the range of the bit length larger than reproducing resolution of a magnetic reproducing head. When data are recorded magneto-optically on a magnetic recording medium, the radius of curvature of arcs constituting the boundary of recorded magnetic domains is made as large as possible so that the shape of the recorded spot may be substantially rectangular. As a result, it becomes possible to improve the efficiency of magnetic reproduction, and high-output as well as high-SN-ratio reproduction at high linear recording density can be achieved.Type: GrantFiled: July 18, 2000Date of Patent: September 11, 2001Assignee: Hitachi, Ltd.Inventors: Kazuetsu Yoshida, Hiroaki Nemoto, Hideki Saga
-
Patent number: 6255034Abstract: A radiation sensitive composition contains (A) a colorant, (B) a binder polymer, (C) a polyfunctional monomer and (D) a carboxyl group-containing monofunctional monomer, an amide group-containing monoethylenically unsaturated monomer, a monoethylenically unsaturated monomer having a cyclic amide group or cyclic imide group or a phenyl group-containing (meth)acrylate, and (E) a photopolymerization initiator. The composition is useful for producing a color filter for use in color liquid crystal display device, color image pick-up elements etc.Type: GrantFiled: September 8, 1998Date of Patent: July 3, 2001Assignee: JSR CorporationInventors: Satoshi Shimada, Tomio Nagatsuka, Hiroaki Nemoto, Atsushi Kumano