Patents by Inventor Makota Hasegawa

Makota Hasegawa 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).

  • Optically anisotropic material, optical element and optical information writing/reading device
    Patent number: 8293134
    Abstract: An optically anisotropic material having a good durability against light is provided. Further, an optical element having a good durability against light and an optical information writing/reading device employing such an element are provided. The optically anisotropic material is obtainable by polymerizing a polymerizable liquid crystal composition containing at least 5 mol % of at least one type of polymerizable compound represented by a general formula CH2?CR1—COO—K-Cy-Cy-L-OCO—CR2?CH2. A phase difference plate 4 produced by employing the optically anisotropic material has a good durability against light, and accordingly, the phase difference plate 4 can realize an optical heat device suitable for large capacity writing/reading by employing a blue laser as a light source 1.
    Type: Grant
    Filed: December 28, 2010
    Date of Patent: October 23, 2012
    Assignee: Asahi Glass Company, Limited
    Inventors: Satoshi Okada, Hiroshi Kumai, Makota Hasegawa
  • OPTICALLY ANISOTROPIC MATERIAL, OPTICAL ELEMENT AND OPTICAL INFORMATION WRITING/READING DEVICE
    Publication number: 20110089372
    Abstract: An optically anisotropic material having a good durability against light is provided. Further, an optical element having a good durability against light and an optical information writing/reading device employing such an element are provided. The optically anisotropic material is obtainable by polymerizing a polymerizable liquid crystal composition containing at least 5 mol % of at least one type of polymerizable compound represented by a general formula CH2?CR1—COO—K-Cy-Cy-L-OCO—CR2?CH2. A phase difference plate 4 produced by employing the optically anisotropic material has a good durability against light, and accordingly, the phase difference plate 4 can realize an optical heat device suitable for large capacity writing/reading by employing a blue laser as a light source 1.
    Type: Application
    Filed: December 28, 2010
    Publication date: April 21, 2011
    Applicant: ASAHI GLASS COMPANY, LIMITED
    Inventors: Satoshi OKADA, Hiroshi Kumai, Makota Hasegawa