Patents by Inventor Shigeru Takizawa

Shigeru Takizawa 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: 8641937
    Abstract: A method for producing a mold for molding a lens wherein the upper surface of a glass material to be molded is molded by a thermal sag method using a continuous heating furnace. A mold having a curvature distribution on the molding surface is used, the highest temperature direction from the geometric center of the molding surface to the highest temperature point in the furnace is determined in one or more regions by measuring the temperature at a plurality of measuring points on the molding surface and the mold is rotated during the forming of the mold in which an eyeglass lens is subsequently molded.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: February 4, 2014
    Assignee: Hoya Corporation
    Inventors: Noriaki Taguchi, Shigeru Takizawa
  • Patent number: 8162719
    Abstract: The optical surface of a lens (21) held and rotated by the rotating shaft (12) of a lathe is cut or ground into an aspherical surface from a direction perpendicular to the axis of the rotating shaft (12) and the axial direction of the rotating shaft (12) while a processing locus (t) which is concentric or spiral about the rotating shaft (12) as the center is formed. In processing, the lens (21) is arranged in a grinding region (20) at a position spaced apart from the turning center (Zo) of the processing locus (t).
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: April 24, 2012
    Assignee: Hoya Corporation
    Inventors: Keigo Hasegawa, Yoshihiro Kikuchi, Shigeru Takizawa
  • Publication number: 20120086138
    Abstract: An aspect of the present invention relates to a method of manufacturing a formed article forming an upper surface of a forming material comprised of a thermosoftening substance into a desired shape by heating the forming material in a state where the forming material is positioned on a forming surface of a forming mold to a temperature permitting deformation of the forming material to bring a lower surface of the forming material into tight contact with the forming surface. The heating is conducted by positioning the forming mold, on which the forming material has been positioned, beneath heat source(s) radiating radiant heat in a state where a plate-shaped member the outermost surface of which is comprised of a metal material is positioned above the upper surface of the forming material.
    Type: Application
    Filed: June 23, 2010
    Publication date: April 12, 2012
    Applicant: Hoya Corporation
    Inventors: Noriaki Taguchi, Shigeru Takizawa
  • Publication number: 20110304064
    Abstract: The present invention relates to a method of manufacturing a lens casting mold by introducing a forming mold, with a forming surface on which is positioned a glass material being formed, into a continuous heating furnace and conducting thermal treatment while conveying the forming mold to form an upper surface of the glass material being formed into a shape of a molding surface for forming a surface comprising a progressive surface.
    Type: Application
    Filed: November 25, 2008
    Publication date: December 15, 2011
    Applicant: Hoya Corporation
    Inventors: Noriaki Taguchi, Shigeru Takizawa, Hidetaka Shimizu
  • Publication number: 20110163466
    Abstract: The present invention relates to a method of manufacturing a lens casting mold in which an upper surface of a glass material being formed is formed into a shape of a molding surface for forming a surface comprising a progressive surface or a progressive element by using a continuous heating furnace. As the forming mold, a forming mold having a curvature distribution on the forming surface is utilized. In one aspect, a temperature of the continuous heating furnace is controlled so that the continuous heating furnace comprises a temperature rising region having a temperature distribution such that the temperature rises in a conveyance direction of the forming mold, and a separation distance between the forming surface of the forming mold and a lower surface of the glass material being formed is specified in two or more spots before introduction to the continuous heating furnace.
    Type: Application
    Filed: February 26, 2010
    Publication date: July 7, 2011
    Applicant: HOYA CORPORATION
    Inventors: Noriaki Taguchi, Shigeru Takizawa
  • Publication number: 20110127685
    Abstract: An aspect of the present invention relates to a method of manufacturing a lens casting mold by introducing a forming mold, with a forming surface on which a glass material being formed is positioned, into a continuous heating furnace and conducting thermal treatment while conveying the forming mold in the furnace to form an upper surface of the glass material being formed by bring a lower surface of the glass material being formed into tight contact with the forming surface.
    Type: Application
    Filed: February 26, 2010
    Publication date: June 2, 2011
    Applicant: HOYA CORPORATION
    Inventors: Noriaki Taguchi, Shigeru Takizawa
  • Patent number: 7861626
    Abstract: A lens surface cutting method for a spectacle lens includes the steps of calculating the mean curvature of a lens surface (5) to be machined, calculating a helical machining path (4) that matches the mean curvature, and cutting the lens surface (5) to be machined by a cutting means. The helical machining path (4) calculated by the helical machining path calculating step is a path in which helix spacings P (=P1, P2, . . . Pn) on the lens surface (5) to be machined are equidistant and a helix spacing d (=d1, d2, . . . dn) on an X-Y projection plane 100 increases continuously from a lens outer periphery toward a center. The cutting means cuts the lens surface (5) to be machined from the outer periphery toward the center along the helical machining path (4). Thus, a spectacle lens having a lens surface with a surface accuracy that is almost uniform throughout an entire surface can be obtained.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: January 4, 2011
    Assignee: Hoya Corporation
    Inventors: Hideo Toriumi, Shigeru Takizawa
  • Publication number: 20100239776
    Abstract: The present invention relates to a method of manufacturing a plastic lens comprising a cured film on at least one of a pair of opposing surfaces of a plastic lens substrate. The method of manufacturing a plastic lens of the present invention comprises heating the plastic lens substrate to a temperature greater than or equal to a glass transition temperature of the substrate; coating a photocurable composition on at least one of a pair of opposing surfaces of the lens substrate following the heating; forming a cured film by irradiating the photocurable composition that has been coated on the substrate with light to cure at least a portion of the composition; and conducting a heat treatment of the plastic lens on which the cured film has been formed at a temperature, the temperature being lower than the glass transition temperature of the substrate but greater than or equal to a glass transition temperature of the cured film.
    Type: Application
    Filed: July 18, 2008
    Publication date: September 23, 2010
    Applicant: HOYA CORPORATION
    Inventors: Eiichi Yajima, Kazunori Mikami, Takamitsu Hirose, Takeshi Imizu, Eisaku Kuroyama, Shigeru Takizawa
  • Publication number: 20100112907
    Abstract: The optical surface of a lens (21) held and rotated by the rotating shaft (12) of a lathe is cut or ground into an aspherical surface from a direction perpendicular to the axis of the rotating shaft (12) and the axial direction of the rotating shaft (12) while a processing locus (t) which is concentric or spiral about the rotating shaft (12) as the center is formed. In processing, the lens (21) is arranged in a grinding region (20) at a position spaced apart from the turning center (Zo) of the processing locus (t).
    Type: Application
    Filed: March 27, 2008
    Publication date: May 6, 2010
    Applicant: HOYA COPORATION
    Inventors: Keigo Hasegawa, Yoshihiro Kikuchi, Shigeru Takizawa
  • Publication number: 20090047874
    Abstract: A lens surface cutting method for a spectacle lens includes the steps of calculating the mean curvature of a lens surface (5) to be machined, calculating a helical machining path (4) that matches the mean curvature, and cutting the lens surface (5) to be machined by a cutting means. The helical machining path (4) calculated by the helical machining path calculating step is a path in which helix spacings P (=P1, P2, . . . Pn) on the lens surface (5) to be machined are equidistant and a helix spacing d (=d1, d2, . . . dn) on an X-Y projection plane 100 increases continuously from a lens outer periphery toward a center. The cutting means cuts the lens surface (5) to be machined from the outer periphery toward the center along the helical machining path (4). Thus, a spectacle lens having a lens surface with a surface accuracy that is almost uniform throughout an entire surface can be obtained.
    Type: Application
    Filed: December 20, 2006
    Publication date: February 19, 2009
    Inventors: Hideo Toriumi, Shigeru Takizawa