Patents by Inventor Takamasa Tamura
Takamasa Tamura 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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Publication number: 20210226199Abstract: A nonaqueous electrolyte secondary battery according to an embodiment includes a spirally wound electrode body in which a positive electrode and a negative electrode are spirally wound with a separator interposed therebetween. The negative electrode includes a negative electrode current collector, a first negative electrode mixture layer disposed on a first surface of the negative electrode current collector, and a second negative electrode mixture layer disposed on a second surface of the negative electrode current collector. The first surface and the second surface face outward and inward of the electrode body, respectively. At least the first negative electrode mixture layer includes a Si active material. The content of the Si active material in terms of Si in the second negative electrode mixture layer is lower than the content of the Si active material in terms of Si in the first negative electrode mixture layer.Type: ApplicationFiled: April 26, 2019Publication date: July 22, 2021Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Takamasa Tamura, Nobuhiro Sakitani, Takaharu Morikawa
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Publication number: 20210218019Abstract: A nonaqueous electrolyte secondary battery according to an embodiment includes a negative electrode including a negative electrode current collector, a first negative electrode mixture layer disposed on a first surface of the negative electrode current collector, and a second negative electrode mixture layer disposed on a second surface of the negative electrode current collector. The first surface and the second surface face outward and inward of the electrode body, respectively. The first negative electrode mixture layer includes a Si active material. The content of the Si active material in terms of Si is lower in a portion of the first negative electrode mixture layer which faces the negative electrode current collector in a thickness direction of the first negative electrode mixture layer, than in a portion of the first negative electrode mixture layer which faces the surface of the first negative electrode mixture layer in the thickness direction.Type: ApplicationFiled: April 26, 2019Publication date: July 15, 2021Applicant: Panasonic Intellectual Property Management Co., Ltd.Inventors: Takamasa Tamura, Nobuhiro Sakitani, Takaharu Morikawa
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Patent number: 9310528Abstract: A method for manufacturing a lens which includes raised portions arranged on a surface of the lens with a pitch smaller than or equal to a predetermined pitch, and is configured to reduce reflection of light having a wavelength longer than or equal to the predetermined pitch includes preparing a molding die in which recessed portions corresponding to the raised portions are formed, filling a molten resin material into a cavity of the molding die via a gate, and curing the resin material in the molding die. The molding die includes a peripheral region in a periphery of the gate, and an adjacent region adjacent to the peripheral region. First recessed portions in the peripheral region are deeper than second recessed portions in the adjacent region.Type: GrantFiled: September 18, 2013Date of Patent: April 12, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Jun Murata, Takamasa Tamura
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Patent number: 9285509Abstract: A lens is obtained by injection molding. The lens includes a plurality of projections arranged on a surface at a pitch smaller than or equal to a predetermined value to reduce reflection of light with a wavelength equal to or greater than the pitch, and a gate mark formed on an outer periphery of the optical element in the injection molding. A peripheral portion of the surface includes a first region whose circumferential position corresponds to the gate mark, and a second region being adjacent to the first region. A pitch of first projections in the first region is greater than a pitch of second projections in the second region.Type: GrantFiled: April 23, 2014Date of Patent: March 15, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Jun Murata, Takamasa Tamura
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Patent number: 9279916Abstract: A lens is obtained by injection molding. The lens includes a plurality of projections arranged on a surface at a pitch smaller than or equal to a predetermined value to reduce reflection of light with a wavelength equal to or greater than the pitch, and a gate mark formed on an outer periphery of the optical element in the injection molding. A peripheral portion of the surface includes a first region whose circumferential position corresponds to the gate mark, and a second region being adjacent to the first region. Axes of first projections in the first region are inclined more outward than axes of second projections in the second region.Type: GrantFiled: April 23, 2014Date of Patent: March 8, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Jun Murata, Takamasa Tamura
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Patent number: 9268067Abstract: A lens includes a plurality of raised portions and recessed portions in an arrangement, and includes an antireflection structure. The antireflection structure includes an area where a height of each of the raised portions is relatively low and a depth of each of the recessed portions is relatively shallow, and an area where a height of each of the raised portions is relatively high and a depth of each of the recessed portions is relatively deep. In the area where the height of each of the raised portions is relatively low and the depth of each of the recessed portions is relatively shallow, first and second flat surfaces are respectively provided at a top portion of the raised portion and a bottom portion of the recessed portion.Type: GrantFiled: February 12, 2013Date of Patent: February 23, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Takamasa Tamura, Kazuhiro Yamada
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Patent number: 9164200Abstract: A lens includes a first optical surface including an optical axis X, and a first cut end surface at an outer circumference of the first optical surface. The first optical surface has a first SWS configured to reduce reflection of light. The first cut end surface has a second SWS configured to reduce reflection of light. A reflectance of the second SWS with respect to light having a predetermined wavelength is higher than the reflectance of the first SWS with respect to the light having the predetermined wavelength.Type: GrantFiled: September 18, 2013Date of Patent: October 20, 2015Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Takamasa Tamura, Jun Murata
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Publication number: 20140320968Abstract: A lens is obtained by injection molding. The lens includes a plurality of projections arranged on a surface at a pitch smaller than or equal to a predetermined value to reduce reflection of light with a wavelength equal to or greater than the pitch, and a gate mark formed on an outer periphery of the optical element in the injection molding. A peripheral portion of the surface includes a first region whose circumferential position corresponds to the gate mark, and a second region being adjacent to the first region. A pitch of first projections in the first region is greater than a pitch of second projections in the second region.Type: ApplicationFiled: April 23, 2014Publication date: October 30, 2014Applicant: PANASONIC CORPORATIONInventors: Jun MURATA, Takamasa TAMURA
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Publication number: 20140254019Abstract: A lens is obtained by injection molding. The lens includes a plurality of projections arranged on a surface at a pitch smaller than or equal to a predetermined value to reduce reflection of light with a wavelength equal to or greater than the pitch, and a gate mark formed on an outer periphery of the optical element in the injection molding. A peripheral portion of the surface includes a first region whose circumferential position corresponds to the gate mark, and a second region being adjacent to the first region. Axes of first projections in the first region are inclined more outward than axes of second projections in the second region.Type: ApplicationFiled: April 23, 2014Publication date: September 11, 2014Applicant: PANASONIC CORPORATIONInventors: Jun MURATA, Takamasa TAMURA
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Publication number: 20140240840Abstract: An optical member of the present technique is an optical member that has an anti-reflective structure being optimum for use with an optical system such as an imaging device. The optical member includes: a first face and a second face opposing to each other; a first microstructure part formed at the first face, and including a plurality of unit structures arranged in the first microstructure part; and a second microstructure part formed at the second face, and including a plurality of unit structures arranged in the second microstructure part. The pitch of the unit structures forming the first microstructure part and the pitch of the unit structures forming the second microstructure part are different from each other.Type: ApplicationFiled: February 19, 2014Publication date: August 28, 2014Applicant: PANASONIC CORPORATIONInventor: Takamasa TAMURA
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Publication number: 20140063610Abstract: A method for manufacturing a lens which includes raised portions arranged on a surface of the lens with a pitch smaller than or equal to a predetermined pitch, and is configured to reduce reflection of light having a wavelength longer than or equal to the predetermined pitch includes preparing a molding die in which recessed portions corresponding to the raised portions are formed, filling a molten resin material into a cavity of the molding die via a gate, and curing the resin material in the molding die. The molding die includes a peripheral region in a periphery of the gate, and an adjacent region adjacent to the peripheral region. First recessed portions in the peripheral region are deeper than second recessed portions in the adjacent region.Type: ApplicationFiled: September 18, 2013Publication date: March 6, 2014Applicant: PANASONIC CORPORATIONInventors: Jun MURATA, Takamasa TAMURA
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Publication number: 20140016187Abstract: A lens includes a first optical surface, and a first cut end surface outside the first optical surface. The first optical surface has a SWS configured to reduce reflection of light. The first cut end surface has a SWS configured to reduce reflection of light and a reflection surface configured to reflect light having a predetermined wavelength.Type: ApplicationFiled: September 17, 2013Publication date: January 16, 2014Applicant: PANASONIC CORPORATIONInventors: Jun MURATA, Takamasa TAMURA
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Publication number: 20140016189Abstract: A lens includes a first optical surface including an optical axis X, and a first cut end surface at an outer circumference of the first optical surface. The first optical surface has a first SWS configured to reduce reflection of light. The first cut end surface has a second SWS configured to reduce reflection of light. A reflectance of the second SWS with respect to light having a predetermined wavelength is higher than the reflectance of the first SWS with respect to the light having the predetermined wavelength.Type: ApplicationFiled: September 18, 2013Publication date: January 16, 2014Applicant: PANASONIC CORPORATIONInventors: Takamasa TAMURA, Jun MURATA
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Patent number: 8529075Abstract: An antireflection structure having a high antireflection effect is provided. An antireflection structure (50) reduces reflection of light having a wavelength equal to or larger than a predetermined wavelength, and absorbs the light whose reflection is reduced. The antireflection structure (50) includes a base structure portion (7) which is configured to have a plurality of structural units (70) arranged on a reference plane, and each having a tilted surface (71) so that an angle between the first side surface (71) and a reference plane (51) is a predetermined angle, and a plurality of fine concave/convex portions (8, 8, . . . ) which are formed on a surface of the base structure portion (7), and arranged within a cycle equal to or smaller than the predetermined wavelength.Type: GrantFiled: September 3, 2008Date of Patent: September 10, 2013Assignee: Panasonic CorporationInventors: Kazuhiro Yamada, Takamasa Tamura, Yasuhiro Tanaka
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Patent number: 8259394Abstract: A diffusing plate is formed so as to have a surface having a larger surface roughness than a predetermined wavelength and having an aperiodic roughness shape. A plurality of fine concave/convex portions are formed on the surface so as to be arranged within a cycle equal to and smaller than a predetermined wavelength.Type: GrantFiled: April 15, 2011Date of Patent: September 4, 2012Assignee: Panasonic CorporationInventors: Kazuhiro Yamada, Takamasa Tamura, Motonobu Yoshikawa, Hiroshi Yamaguchi, Kazuhiko Ishimaru
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Publication number: 20110299169Abstract: A diffusing plate has a surface including a plurality of fine concave/convex portions regularly arranged within a cycle equal to or smaller than a predetermined wavelength. The surface has a larger surface roughness than the predetermined wavelength. An average value for an angle between a normal vector of the tangent plane of a roughness shape of the surface and a normal vector of a reference plane of the surface is 5 degrees or more.Type: ApplicationFiled: August 15, 2011Publication date: December 8, 2011Applicant: Panasonic CorporationInventors: Kazuhiro YAMADA, Takamasa TAMURA, Motonobu YOSHIKAWA, Hiroshi YAMAGUCHI, Kazuhiko ISHIMARU
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Patent number: 8023190Abstract: A diffusing plate has a surface including a plurality of fine concave/convex portions regularly arranged within a cycle equal to or smaller than a predetermined wavelength. The surface has a larger surface roughness than the predetermined wavelength. An average value for an angle between a normal vector of the tangent plane of a roughness shape of the surface and a normal vector of a reference plane of the surface is 5 degrees or more.Type: GrantFiled: May 15, 2007Date of Patent: September 20, 2011Assignee: Panasonic CorporationInventors: Kazuhiro Yamada, Takamasa Tamura, Motonobu Yoshikawa, Hiroshi Yamaguchi, Kazuhiko Ishimaru
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Publication number: 20110188123Abstract: A diffusing plate is formed so as to have a surface having a larger surface roughness than a predetermined wavelength and having an aperiodic roughness shape. A plurality of fine concave/convex portions are formed on the surface so as to be arranged within a cycle equal to and smaller than a predetermined wavelength.Type: ApplicationFiled: April 15, 2011Publication date: August 4, 2011Applicant: PANASONIC CORPORATIONInventors: Kazuhiro YAMADA, Takamasa TAMURA, Motonobu YOSHIKAWA, Hiroshi YAMAGUCHI, Kazuhiko ISHIMARU
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Patent number: 7957064Abstract: A diffusing plate is formed so as to have a surface having a larger surface roughness than a predetermined wavelength and having an aperiodic roughness shape. A plurality of fine concave/convex portions are formed on the surface so as to be regularly arranged within a cycle equal to and smaller than a predetermined wavelength.Type: GrantFiled: May 15, 2007Date of Patent: June 7, 2011Assignee: Panasonic CorporationInventors: Kazuhiro Yamada, Takamasa Tamura, Motonobu Yoshikawa, Hiroshi Yamaguchi, Kazuhiko Ishimaru
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Publication number: 20100271706Abstract: The present disclosure relates to an optical member in which an antireflection concave-convex structure for suppressing reflection of light is provided on its surface, and an optical system, an optical unit and an optical device each including the optical member. The present disclosure provides an optical member in which the generation of reflection light and diffraction light is sufficiently suppressed and which can be fabricated in a simple manner. A antireflection concave-convex structure (15) for suppressing reflection of light, formed of filiform convex portions (16) regularly arranged, is provided on an interior surface (1a) of a lens tube (1). The antireflection concave-convex structure (15) is configured so that an angle between a normal vector of an incident plane of the light whose reflection is to be suppressed and a vector connecting respective apexes of adjacent two of the structure units at the incident surface is 60 degrees or less.Type: ApplicationFiled: June 20, 2007Publication date: October 28, 2010Applicant: PANASONIC CORPORATIONInventors: Kazuhiro Yamada, Yasuhiro Tanaka, Michihiro Yamagata, Makoto Umetani, Takamasa Tamura, Motonobu Yoshikawa, Hiroshi Yamaguchi, Masaaki Sunohara