Patents by Inventor Kenji Tanagawa

Kenji Tanagawa 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: 11061258
    Abstract: A mold for a plastic lens that arranges an insert member inside a cavity formed between a pair of halved molds, injects and fills molten raw material resin to mold a plastic lens having a predetermined shape, integrally with the insert member. The insert member is arranged on a molding surface on one of the halved molds, a notch to be engaged with a positioning tab formed at a periphery of the insert member is engraved on one parting surface of the halved mold, overlapping with a gate position. Positioning of the insert member is performed by engaging the positioning tab with the notch. With this configuration, in molding a plastic lens having an insert member by injection molding including insert molding, positioning of the insert member is performed at the gate position without deteriorating the quality of a molded product and without increasing the load of post-processing after molding.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: July 13, 2021
    Assignee: HOYA LENS THAILAND LTD.
    Inventors: Kiyohiro Saito, Takashi Suzuki, Kenji Tanagawa, Kiyonori Sato
  • Patent number: 10525645
    Abstract: In manufacturing a functional plastic lens by loading a functional sheet S having a difference in the accuracy of bending in directions, into a mold 50 and by performing insert molding to integrally mold a lens body with the functional sheet S, a direction in which the accuracy of the bending to the functional sheet S is high is made to be a reference axis A, and the functional sheet S is loaded into the mold 50 to inhibit a filling direction of resin and the reference axis A from being orthogonal to each other. With this arrangement, the functional plastic lens having high quality is provided.
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: January 7, 2020
    Assignee: HOYA LENS THAILAND LTD.
    Inventors: Kiyohiro Saito, Takashi Suzuki, Kiyonori Sato, Kenji Tanagawa
  • Publication number: 20180043645
    Abstract: In manufacturing a functional plastic lens by loading a functional sheet S having a difference in the accuracy of bending in directions, into a mold 50 and by performing insert molding to integrally mold a lens body with the functional sheet S, a direction in which the accuracy of the bending to the functional sheet S is high is made to be a reference axis A, and the functional sheet S is loaded into the mold 50 to inhibit a filling direction of resin and the reference axis A from being orthogonal to each other. With this arrangement, the functional plastic lens having high quality is provided.
    Type: Application
    Filed: March 31, 2016
    Publication date: February 15, 2018
    Applicant: HOYA LENS THAILAND LTD.
    Inventors: Kiyohiro SAITO, Takashi SUZUKI, Kiyonori SATO, Kenji TANAGAWA
  • Publication number: 20170131573
    Abstract: A mold for a plastic lens that arranges an insert member inside a cavity formed between a pair of halved molds, injects and fills molten raw material resin to mold a plastic lens having a predetermined shape, integrally with the insert member. The insert member is arranged on a molding surface on one of the halved molds, a notch to be engaged with a positioning tab formed at a periphery of the insert member is engraved on one parting surface of the halved mold, overlapping with a gate position. Positioning of the insert member is performed by engaging the positioning tab with the notch. With this configuration, in molding a plastic lens having an insert member by injection molding including insert molding, positioning of the insert member is performed at the gate position without deteriorating the quality of a molded product and without increasing the load of post-processing after molding.
    Type: Application
    Filed: March 25, 2015
    Publication date: May 11, 2017
    Applicant: HOYA LENS THAILAND LTD.
    Inventors: Kiyohiro SAITO, Takashi SUZUKI, Kenji TANAGAWA, Kiyonori SATO
  • Patent number: 8506857
    Abstract: An injection compression molding method of a lens is provided, where a toggle link mechanism (65) is actuated to close a molding die (50) and a movable die plate (64) is moved to a position establishing a cavity thickness of greater than a thickness of an article to be molded while the die is closed. After injecting a molten resin into the cavity, the molten resin is sealed in the cavity and the toggle link mechanism (65) is actuated to advance the movable die plate (64) toward a fixed die plate (61), the relative position of a rear die plate (62) and the movable die plate (64) is made constant at a position where extension of a tie bar (63) becomes a predetermined value, and the molten resin is cooled for a predetermined time after completion of pressurizing the resin.
    Type: Grant
    Filed: December 4, 2007
    Date of Patent: August 13, 2013
    Assignee: Hoya Corporation
    Inventors: Tatsuo Nishimoto, Kiyohiro Saito, Kenji Tanagawa, Tetsuya Uchida
  • Publication number: 20080118594
    Abstract: An injection compression molding method of a lens is provided, where a toggle link mechanism (65) is actuated to close a molding die (50) and a movable die plate (64) is moved to a position establishing a cavity thickness of greater than a thickness of an article to be molded while the die is closed. After injecting a molten resin into the cavity, the molten resin is sealed in the cavity and the toggle link mechanism (65) is actuated to advance the movable die plate (64) toward a fixed die plate (61), the relative position of a rear die plate (62) and the movable die plate (64) is made constant at a position where extension of a tie bar (63) becomes a predetermined value, and the molten resin is cooled for a predetermined time after completion of pressurizing the resin.
    Type: Application
    Filed: December 4, 2007
    Publication date: May 22, 2008
    Applicant: HOYA CORPORATION
    Inventors: Tatsuo Nishimoto, Kiyohiro Saito, Kenji Tanagawa, Tetsuya Uchida
  • Publication number: 20080116597
    Abstract: An injection compression molding method of a lens is provided, where a toggle link mechanism (65) is actuated to close a molding die (50) and a movable die plate (64) is moved to a position establishing a cavity thickness of greater than a thickness of an article to be molded while the die is closed. After injecting a molten resin into the cavity, the molten resin is sealed in the cavity and the toggle link mechanism (65) is actuated to advance the movable die plate (64) toward a fixed die plate (61), the relative position of a rear die plate (62) and the movable die plate (64) is made constant at a position where extension of a tie bar (63) becomes a predetermined value, and the molten resin is cooled for a predetermined time after completion of pressurizing the resin.
    Type: Application
    Filed: December 4, 2007
    Publication date: May 22, 2008
    Applicant: HOYA CORPORATION
    Inventors: Tatsuo Nishimoto, Kiyohiro Saito, Kenji Tanagawa, Tetsuya Uchida
  • Publication number: 20080093756
    Abstract: An injection compression molding method of a lens is provided, where a toggle link mechanism (65) is actuated to close a molding die (50) and a movable die plate (64) is moved to a position establishing a cavity thickness of greater than a thickness of an article to be molded while the die is closed. After injecting a molten resin into the cavity, the molten resin is sealed in the cavity and the toggle link mechanism (65) is actuated to advance the movable die plate (64) toward a fixed die plate (61), the relative position of a rear die plate (62) and the movable die plate (64) is made constant at a position where extension of a tie bar (63) becomes a predetermined value, and the molten resin is cooled for a predetermined time after completion of pressurizing the resin.
    Type: Application
    Filed: December 4, 2007
    Publication date: April 24, 2008
    Applicant: HOYA CORPORATION
    Inventors: Tatsuo Nishimoto, Kiyohiro Saito, Kenji Tanagawa, Tetsuya Uchida
  • Patent number: 7326375
    Abstract: An injection compression molding method of a lens is provided, where a toggle link mechanism (65) is actuated to close a molding die (50) and a movable die plate (64) is moved to a position establishing a cavity thickness of greater than a thickness of an article to be molded while the die is closed. After injecting a molten resin into the cavity, the molten resin is sealed in the cavity and the toggle link mechanism (65) is actuated to advance the movable die plate (64) toward a fixed die plate (61), the relative position of a rear die plate (62) and the movable die plate (64) is made constant at a position where extension of a tie bar (63) becomes a predetermined value, and the molten resin is cooled for a predetermined time after completion of pressurizing the resin.
    Type: Grant
    Filed: October 28, 2002
    Date of Patent: February 5, 2008
    Assignee: Hoya Corporation
    Inventors: Tatsuo Nishimoto, Kiyohiro Saito, Kenji Tanagawa, Tetsuya Uchida
  • Publication number: 20030080448
    Abstract: An injection compression molding method of a lens is provided, where a toggle link mechanism (65) is actuated to close a molding die (50) and a movable die plate (64) is moved to a position establishing a cavity thickness of greater than a thickness of an article to be molded while the die is closed. After injecting a molten resin into the cavity, the molten resin is sealed in the cavity and the toggle link mechanism (65) is actuated to advance the movable die plate (64) toward a fixed die plate (61), the relative position of a rear die plate (62) and the movable die plate (64) is made constant at a position where extension of a tie bar (63) becomes a predetermined value, and the molten resin is cooled for a predetermined time after completion of pressurizing the resin.
    Type: Application
    Filed: October 28, 2002
    Publication date: May 1, 2003
    Applicant: HOYA CORPORATION
    Inventors: Tatsuo Nishimoto, Kiyohiro Saito, Kenji Tanagawa, Tetsuya Uchida