Patents by Inventor Hiroki Takazawa

Hiroki Takazawa 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: 8785339
    Abstract: An optical glass comprising, by mass %, 12 to 40% of SiO2, 15% or more but less than 42% of Nb2O5, 2% or more but less than 18% of TiO2, (provided that Nb2O5/TiO2 is over 0.6), 0.1 to 20% of Li2O, 0.1 to 15% of Na2O, and 0.1 to 25% of K2O, and having an Abbe's number ?d of 20 to 30, a ?Pg,F of 0.016 or less and a liquidus temperature of 1,200° C. or lower.
    Type: Grant
    Filed: June 4, 2013
    Date of Patent: July 22, 2014
    Assignee: Hoya Corporation
    Inventors: Xuelu Zou, Yoshio Nojima, Hiroki Takazawa
  • Patent number: 8647996
    Abstract: The present invention relates to an optical glass, a preform for precision press molding, methods for manufacturing the same, and an image pickup device. The optical glass of the present invention not only has a high refractive index, a high dispersion property, and good precision press moldability, but also has good stability with respect to devitrification when reheated (referred to as “devitrification stability upon reheating”), and is an optical glass with a good partial dispersion ratio (Pg, F).
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: February 11, 2014
    Assignee: Hoya Corporation
    Inventor: Hiroki Takazawa
  • Patent number: 8575047
    Abstract: The present invention relates to an optical glass with a high refractive index and good precision press moldability, and a preform for precision press molding and an optical element that are comprised of the optical glass. The present invention further relates to a method of manufacturing an optical element, a lens unit being equipped with an optical element and an image pickup device being equipped with a lens unit.
    Type: Grant
    Filed: August 13, 2012
    Date of Patent: November 5, 2013
    Assignee: Hoya Corporation
    Inventors: Yasuhiro Fujiwara, Shuhei Mikami, Hiroki Takazawa
  • Publication number: 20130270493
    Abstract: An optical glass comprising, by mass %, 12 to 40% of SiO2, 15% or more but less than 42% of Nb2O5, 2% or more but less than 18% of TiO2, (provided that Nb2O5/TiO2 is over 0.6), 0.1 to 20% of Li2O, 0.1 to 15% of Na2O, and 0.1 to 25% of K2O, and having an Abbe's number ?d of 20 to 30, a ?Pg,F of 0.016 or less and a liquidus temperature of 1,200° C. or lower.
    Type: Application
    Filed: June 4, 2013
    Publication date: October 17, 2013
    Inventors: Xuelu ZOU, Yoshio NOJIMA, Hiroki TAKAZAWA
  • Patent number: 8476178
    Abstract: An optical glass comprising, by mass %, 12 to 40% of SiO2, 15% or more but less than 42% of Nb2O5, 2% or more but less than 18% of TiO2, (provided that Nb2O5/TiO2 is over 0.6), 0.1 to 20% of Li2O, 0.1 to 15% of Na2O, and 0.1 to 25% of K2O, and having an Abbe's number ?d of 20 to 30, a ?Pg,F of 0.016 or less and a liquidus temperature of 1,200° C. or lower.
    Type: Grant
    Filed: January 22, 2009
    Date of Patent: July 2, 2013
    Assignee: Hoya Corporation
    Inventors: Xuelu Zou, Yoshio Nojima, Hiroki Takazawa
  • Patent number: 8431504
    Abstract: An optical glass that is an oxide glass and comprises, by cationic %, 20 to 40% of a total of Si4+ and B3+, 15 to 40% of a total of Nb5+, Ti4+, W6+ and Zr4+, 0.2 to 20% of a total of Zn2+, Ba2+, Sr2+ and Ca2+, and 15 to 55% of a total of Li+, Na+ and K+, the cationic ratio of the content of B3+ to the total content of B3+ and Si4+ being 0.01-0.5, the cationic ratio of the content of Zr4+ to the total content of Nb5+, Ti4+, W6+ and Zr4+ being 0.05 or less, the molar ratio of the total content of Zn2+ and Ba2+ to the total content of Zn2+, Ba2+, Sr2+ and Ca2+ being 0.8-1, the optical glass having a refractive index nd of 1.815 or more and an Abbe's number ?d of 29 or less.
    Type: Grant
    Filed: July 23, 2010
    Date of Patent: April 30, 2013
    Assignee: Hoya Corporation
    Inventor: Hiroki Takazawa
  • Publication number: 20120309605
    Abstract: The present invention relates to an optical glass with a high refractive index and good precision press moldability, and a preform for precision press molding and an optical element that are comprised of the optical glass. The present invention further relates to a method of manufacturing an optical element, a lens unit being equipped with an optical element and an image pickup device being equipped with a lens unit.
    Type: Application
    Filed: August 13, 2012
    Publication date: December 6, 2012
    Applicant: HOYA CORPORATION
    Inventors: Yasuhiro FUJIWARA, Shuhei MIKAMI, Hiroki TAKAZAWA
  • Patent number: 8288299
    Abstract: The present invention relates to an optical glass with a high refractive index and good precision press moldability, and a preform for precision press molding and an optical element that are comprised of the optical glass. The present invention further relates to a method of manufacturing an optical element, a lens unit being equipped with an optical element and an image pickup device being equipped with a lens unit.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: October 16, 2012
    Assignee: Hoya Corporation
    Inventors: Yasuhiro Fujiwara, Shuhei Mikami, Hiroki Takazawa
  • Publication number: 20110245063
    Abstract: The present invention relates to an optical glass, a preform for precision press molding, methods for manufacturing the same, and an image pickup device. The optical glass of the present invention not only has a high refractive index, a high dispersion property, and good precision press moldability, but also has good stability with respect to devitrification when reheated (referred to as “devitrification stability upon reheating”), and is an optical glass with a good partial dispersion ratio (Pg, F).
    Type: Application
    Filed: March 28, 2011
    Publication date: October 6, 2011
    Applicant: HOYA CORPORATION
    Inventor: Hiroki TAKAZAWA
  • Publication number: 20110143907
    Abstract: The present invention relates to an optical glass with a high refractive index and good precision press moldability, and a preform for precision press molding and an optical element that are comprised of the optical glass. The present invention further relates to a method of manufacturing an optical element, a lens unit being equipped with an optical element and an image pickup device being equipped with a lens unit.
    Type: Application
    Filed: February 3, 2010
    Publication date: June 16, 2011
    Applicant: HOYA CORPORATION
    Inventors: Yasuhiro Fujiwara, Shuhei Mikami, Hiroki Takazawa
  • Publication number: 20110034315
    Abstract: An optical glass that is an oxide glass and comprises, by cationic %, 20 to 40% of a total of Si4+ and B3+, 15 to 40% of a total of Nb5+, Ti4+, W6+ and Zr4+, 0.2 to 20% of a total of Zn2+, Ba2+, Sr2+ and Ca2+, and 15 to 55% of a total of Li+, Na+ and K+, the cationic ratio of the content of B3+ to the total content of B3+ and Si4+ being 0.01-0.5, the cationic ratio of the content of Zr4+ to the total content of Nb5+, Ti4+, W6+ and Zr4+ being 0.05 or less, the molar ratio of the total content of Zn2+ and Ba2+ to the total content of Zn2+, Ba2+, Sr2+ and Ca2+ being 0.8-1, the optical glass having a refractive index nd of 1.815 or more and an Abbe's number ?d of 29 or less.
    Type: Application
    Filed: July 23, 2010
    Publication date: February 10, 2011
    Applicant: HOYA CORPORATION
    Inventor: Hiroki Takazawa
  • Publication number: 20100317507
    Abstract: An optical glass comprising, by mass %, 12 to 40% of SiO2, 15% or more but less than 42% of Nb2O5, 2% or more but less than 18% of TiO2, (provided that Nb2O5/TiO2 is over 0.6), 0.1 to 20% of Li2O, 0.1 to 15% of Na2O, and 0.1 to 25% of K2O, and having an Abbe's number ?d of 20 to 30, a ?Pg,F of 0.016 or less and a liquidus temperature of 1,200° C. or lower.
    Type: Application
    Filed: January 22, 2009
    Publication date: December 16, 2010
    Applicant: HOYA CORPORATION
    Inventors: Xuelu Zou, Yoshio Nojima, Hiroki Takazawa