Patents by Inventor Nobuhiko Takeshita

Nobuhiko Takeshita 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: 11114356
    Abstract: The present invention provides a glass substrate in which in a step of sticking a glass substrate and a silicon-containing substrate to each other, bubbles hardly intrude therebetween. The present invention relates to a glass substrate for forming a laminated substrate by lamination with a silicon-containing substrate, having a warpage of 2 ?m to 300 ?m, and an inclination angle due to the warpage of 0.0004° to 0.12°.
    Type: Grant
    Filed: August 29, 2019
    Date of Patent: September 7, 2021
    Assignee: AGC Inc.
    Inventors: Yu Hanawa, Shigeki Sawamura, Shuhei Nomura, Kazutaka Ono, Nobuhiko Takeshita, Keisuke Hanashima
  • Publication number: 20210163341
    Abstract: A glass substrate for a high-frequency device, which contains, in terms of mole percent on the basis of oxides: 40 to 75% of SiO2; 0 to 15% of Al2O3; 13 to 23% of B2O3; 2.5 to 11% of MgO; and 0 to 13% of CaO, and having a total content of alkali metal oxides in the range of 0.001-5%, where at least one main surface of the glass substrate has a surface roughness of 1.5 um or less in terms of arithmetic average roughness Ra. and the glass substrate has a dielectric dissipation factor at 35 GHz of 0.007 or less.
    Type: Application
    Filed: February 12, 2021
    Publication date: June 3, 2021
    Applicant: AGC Inc.
    Inventors: Kazutaka ONO, Shuhei NOMURA, Nobutaka KIDERA, Nobuhiko TAKESHITA
  • Patent number: 10974987
    Abstract: The present invention relates to a glass substrate for a high-frequency device, which includes SiO2 as a main component, the glass substrate having a total content of alkali metal oxides in the range of 0.001-5% in terms of mole percent on the basis of oxides, the alkali metal oxides having a molar ratio represented by Na2O/(Na2O+K2O) in the range of 0.01-0.99, and the glass substrate having a total content of Al2O3 and B2O3 in the range of 1-40% in terms of mole percent on the basis of oxides and having a molar ratio represented by Al2O3/(Al2O3+B2O3) in the range of 0-0.45, in which at least one main surface of the glass substrate has a surface roughness of 1.5 nm or less in terms of arithmetic average roughness Ra, and the glass substrate has a dielectric dissipation factor at 35 GHz of 0.007 or less.
    Type: Grant
    Filed: March 12, 2019
    Date of Patent: April 13, 2021
    Assignee: AGC Inc.
    Inventors: Kazutaka Ono, Shuhei Nomura, Nobutaka Kidera, Nobuhiko Takeshita
  • Publication number: 20200131077
    Abstract: An optical material for a light guide plate has a refractive index of 1.70 or more, a thickness of 1.1 mm or less, and a waviness of a surface of less than 50×10?4 degrees. The optical material may have the waviness of from 1.0×10?4 to 10×10?4 degrees. The optical material may contain glass.
    Type: Application
    Filed: September 25, 2019
    Publication date: April 30, 2020
    Applicant: AGC INC.
    Inventors: Nobuhiko TAKESHITA, Yusuke ARITA, Akio SUGURO
  • Publication number: 20200123043
    Abstract: A glass substrate for a high-frequency device, which contains SiO2 as a main component, the glass substrate having a total content of alkali metal oxides in the range of 0.001-5% in terms of mole percent on the basis of oxides, the alkali metal oxides having a molar ratio represented by Na2O/(Na2O+K2O) in the range of 0.01-0.99, and the glass substrate having a total content of alkaline earth metal oxides in the range of 0.1-13% in terms of mole percent on the basis of oxides, wherein at least one main surface of the glass substrate has a surface roughness of 1.5 nm or less in terms of arithmetic average roughness Ra, and the glass substrate has a dielectric dissipation factor at 35 GHz of 0.007 or less.
    Type: Application
    Filed: December 19, 2019
    Publication date: April 23, 2020
    Applicant: AGC Inc.
    Inventors: Kazutaka ONO, Shuhei NOMURA, Nobutaka KIDERA, Nobuhiko TAKESHITA
  • Patent number: 10515864
    Abstract: The present invention provides a glass substrate in which in a step of sticking a glass substrate and a silicon-containing substrate to each other, bubbles hardly intrude therebetween. The present invention relates to a glass substrate for forming a laminated substrate by lamination with a silicon-containing substrate, having a warpage of 2 ?m to 300 ?m, and an inclination angle due to the warpage of 0.0004° to 0.12°.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: December 24, 2019
    Assignee: AGC Inc.
    Inventors: Yu Hanawa, Shigeki Sawamura, Shuhei Nomura, Kazutaka Ono, Nobuhiko Takeshita, Keisuke Hanashima
  • Publication number: 20190385920
    Abstract: The present invention provides a glass substrate in which in a step of sticking a glass substrate and a silicon-containing substrate to each other, bubbles hardly intrude therebetween. The present invention relates to a glass substrate for forming a laminated substrate by lamination with a silicon-containing substrate, having a warpage of 2 ?m to 300 ?m, and an inclination angle due to the warpage of 0.0004° to 0.12°.
    Type: Application
    Filed: August 29, 2019
    Publication date: December 19, 2019
    Applicant: AGC Inc.
    Inventors: Yu Hanawa, Shigeki Sawamura, Shuhei Nomura, Kazutaka Ono, Nobuhiko Takeshita, Keisuke Hanashima
  • Publication number: 20190210911
    Abstract: The present invention relates to a glass substrate for a high-frequency device, which includes SiO2 as a main component, the glass substrate having a total content of alkali metal oxides in the range of 0.001-5% in terms of mole percent on the basis of oxides, the alkali metal oxides having a molar ratio represented by Na2O/(Na2O+K2O) in the range of 0.01-0.99, and the glass substrate having a total content of Al2O3 and B2O3 in the range of 1-40% in terms of mole percent on the basis of oxides and having a molar ratio represented by Al2O3/(Al2O3+B2O3) in the range of 0-0.45, in which at least one main surface of the glass substrate has a surface roughness of 1.5 nm or less in terms of arithmetic average roughness Ra, and the glass substrate has a dielectric dissipation factor at 35 GHz of 0.007 or less.
    Type: Application
    Filed: March 12, 2019
    Publication date: July 11, 2019
    Applicant: AGC Inc.
    Inventors: Kazutaka ONO, Shuhei Nomura, Nobutaka Kidera, Nobuhiko Takeshita
  • Publication number: 20180151408
    Abstract: A glass substrate is laminated with a substrate containing silicon to thereby form a laminated substrate. The glass substrate has a concave surface and a convex surface and has one or more marks that distinguish between the concave surface and the convex surface.
    Type: Application
    Filed: January 23, 2018
    Publication date: May 31, 2018
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Yu Hanawa, Shuhei Nomura, Kazutaka Ono, Nobuhiko Takeshita, Keisuke Hanashima
  • Publication number: 20180082914
    Abstract: The present invention provides a glass substrate in which in a step of sticking a glass substrate and a silicon-containing substrate to each other, bubbles hardly intrude therebetween. The present invention relates to a glass substrate for forming a laminated substrate by lamination with a silicon-containing substrate, having a warpage of 2 ?m to 300 ?m, and an inclination angle due to the warpage of 0.0004° to 0.12°.
    Type: Application
    Filed: November 27, 2017
    Publication date: March 22, 2018
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Yu HANAWA, Shigeki SAWAMURA, Shuhei NOMURA, Kazutaka ONO, Nobuhiko TAKESHITA, Keisuke HANASHIMA
  • Publication number: 20160236975
    Abstract: A cover glass for a pen input device has a haze value of less than 1%, and a Martens hardness within a range from 2000 N/mm2 to 4000 N/mm2. When a moving member receiving a load of 150 gf (1.47 N) is moved in one direction, at 10 mm/sec, at room temperature, on the surface of the cover glass, a coefficient of kinetic friction ?k of a kinetic frictional force Fk (N) exerted by the cover glass surface within a region where an approximately linear relationship is established between the kinetic frictional force Fk (N) and the time is 0.14˜0.50, and a standard deviation ? (N) of the kinetic frictional force Fk (N) is no more than 0.03. The moving member is a pen that includes a pen tip made of polyacetal resin with a Rockwell hardness of M90 and having a radius of curvature of 700 ?m.
    Type: Application
    Filed: April 25, 2016
    Publication date: August 18, 2016
    Applicant: Asahi Glass Company, Limited
    Inventors: Naoki SUGIMOTO, Takashi SHIBUYA, Keisuke HANASHIMA, Osamu HOMMA, Katsumi SUZUKI, Kiyohisa NAKAMURA, Nobuhiko TAKESHITA
  • Patent number: 8039064
    Abstract: A compound having a good durability against light and capable of producing desired liquid crystallinity after polymerization, and a polymerizable liquid crystal composition containing such a compound, are provided. Further, an optical element having a good durability against light, and an optical information writing/reading device employing such an element, are provided. A compound represented by CH2?CR1—COO—R2-Cy-Ph-R3—OCO—CR4?CH2. R1 and R4 are each preferably a hydrogen atom. R3 is preferably a C1-6 alkylene group wherein an oxygen atom is present or not present at an end of the group to be bonded to a cyclic group, and wherein some or all of hydrogen atoms bonded to carbon atoms in the group may be substituted by fluorine atoms; or an alkylene group wherein an oxygen atom is present at an end of the group to be bonded to a cyclic group.
    Type: Grant
    Filed: November 23, 2010
    Date of Patent: October 18, 2011
    Assignee: Asahi Glass Company, Limited
    Inventors: Nobuhiko Takeshita, Teppei Konishi, Hiroshi Kumai
  • Patent number: 7986606
    Abstract: An optical head device having a broadband phase plate of transforming at least three linearly polarized light beams having different wavelengths into circularly polarized light beams, is obtained. A broadband phase plate comprising two phase plates 9A and 9B laminated with e.g. an adhesive agent so that their optical axes are crossed, wherein provided that wavelengths of linearly polarized incident light beams are ?1, ?2 and ?3 (?1<?2<?3), at least one or both of the two phase plates has such a phase difference characteristics that a ratio R(?1)/R(?3) and a ratio R(?2)/R(?3) between retardation values of the wavelengths are smaller than 1 and R(?1)/R(?3) is smaller than R(?2)/R(?3), is integrated in the optical head device.
    Type: Grant
    Filed: March 14, 2007
    Date of Patent: July 26, 2011
    Assignee: Asahi Glass Company, Limited
    Inventors: Nobuhiko Takeshita, Tomoki Gunjima, Kara Yoshida
  • Publication number: 20110063966
    Abstract: A compound having a good durability against light and capable of producing desired liquid crystallinity after polymerization, and a polymerizable liquid crystal composition containing such a compound, are provided. Further, an optical element having a good durability against light, and an optical information writing/reading device employing such an element, are provided. A compound represented by CH2?CR1—COO—R2-Cy-Ph-R3—OCO—CR4?CH2. R1 and R4 are each preferably a hydrogen atom. R3 is preferably a C1-6 alkylene group wherein an oxygen atom is present or not present at an end of the group to be bonded to a cyclic group, and wherein some or all of hydrogen atoms bonded to carbon atoms in the group may be substituted by fluorine atoms; or an alkylene group wherein an oxygen atom is present at an end of the group to be bonded to a cyclic group.
    Type: Application
    Filed: November 23, 2010
    Publication date: March 17, 2011
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Nobuhiko TAKESHITA, Teppei Konishi, Hiroshi Kumai
  • Patent number: 7534370
    Abstract: To provide optical elements such as a phase plate suitably used in a broadband range and a polarizing diffraction element excellent in diffraction efficiency, a polymerizable liquid crystal composition to be used for them, and an optical head device using them.
    Type: Grant
    Filed: October 15, 2007
    Date of Patent: May 19, 2009
    Assignee: Asahi Glass Company, Limited
    Inventors: Kara Yoshida, Tomoki Gunjima, Nobuhiko Takeshita, Yuzuru Tanabe, Hiroki Hotaka, Hiromasa Sato
  • Publication number: 20080048149
    Abstract: To provide optical elements such as a phase plate suitably used in a broadband range and a polarizing diffraction element excellent in diffraction efficiency, a polymerizable liquid crystal composition to be used for them, and an optical head device using them.
    Type: Application
    Filed: October 15, 2007
    Publication date: February 28, 2008
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Kara YOSHIDA, Tomoki GUNJIMA, Nobuhiko TAKESHITA, Yuzuru TANABE, Hiroki HOTAKA, Hiromasa SATO
  • Publication number: 20070159932
    Abstract: An optical head device having a broadband phase plate of transforming at least three linearly polarized light beams having different wavelengths into circularly polarized light beams, is obtained. A broadband phase plate comprising two phase plates 9A and 9B laminated with e.g. an adhesive agent so that their optical axes are crossed, wherein provided that wavelengths of linearly polarized incident light beams are ?1, ?2 and ?3 (?1<?2<?3), at least one or both of the two phase plates has such a phase difference characteristics that a ratio R(?1)/R(?3) and a ratio R(?2)/R(?3) between retardation values of the wavelengths are smaller than 1 and R(?1)/R(?3) is smaller than R(?2)/R(?3), is integrated in the optical head device.
    Type: Application
    Filed: March 14, 2007
    Publication date: July 12, 2007
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Nobuhiko Takeshita, Tomoki Gunjima, Kara Yoshida