Patents by Inventor Daiju TAKAMIZU

Daiju TAKAMIZU 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: 11437783
    Abstract: A surface-emitting semiconductor laser includes a first-conductivity-type layer, an active layer, and a second-conductivity-type layer. The active layer and the second-conductivity-type layer are electrically connected in a current constriction layer through an opening. The surface-emitting semiconductor laser further includes an insulating layer that has translucency with respect to an emission wavelength of the active layer, a first electrode electrically connected to the first-conductivity-type layer, and a second electrode electrically connected to the second-conductivity-type layer.
    Type: Grant
    Filed: October 29, 2018
    Date of Patent: September 6, 2022
    Assignee: ROHM CO., LTD.
    Inventors: Masashi Yamamoto, Yuji Tsuji, Daiju Takamizu, Minoru Murayama
  • Publication number: 20220271507
    Abstract: A surface emitting laser device includes: a first semiconductor layer of a first conductive type; a second semiconductor layer including a first light reflecting layer of the first conductive type, a light generating layer, and a second light reflecting layer of a second conductive type, which are laminated in this order from a first semiconductor layer side; a laser diode structure partitioned in a plateau shape including a top surface by a removal portion in which the second semiconductor layer is dug down, and configured to emit a laser beam to the first semiconductor layer side; a first insulating layer formed inside the laser diode structure; and a second insulating layer covering the top surface.
    Type: Application
    Filed: January 21, 2022
    Publication date: August 25, 2022
    Applicant: ROHM CO., LTD.
    Inventor: Daiju TAKAMIZU
  • Publication number: 20210075192
    Abstract: A surface-emitting semiconductor laser includes a semiconductor laminated structure that includes a first-conductivity-type layer, an active layer, and a second-conductivity-type layer and in which light generated in the active layer is extracted as laser light from a side of the second-conductivity-type layer while resonating along a lamination direction of these layers, a current constriction layer in which the active layer and the second-conductivity-type layer are electrically connected together through an opening, an insulating layer that has translucency with respect to an emission wavelength of the active layer, a first electrode electrically connected to the first-conductivity-type layer, and a second electrode electrically connected to the second-conductivity-type layer, and, in the surface-emitting semiconductor laser, a part of the insulating layer is exposed from the second electrode, and the insulating layer exposed from the second electrode includes a first portion that has a first thickness and
    Type: Application
    Filed: October 29, 2018
    Publication date: March 11, 2021
    Applicant: ROHM CO., LTD.
    Inventors: Masashi YAMAMOTO, Yuji TSUJI, Daiju TAKAMIZU, Minoru MURAYAMA
  • Patent number: 10224692
    Abstract: A surface emitting laser element includes a first distribution Bragg reflector (DBR) layer having a first conductivity type; a second DBR layer having a second conductivity type opposite to the first conductivity type; an active layer located between the first DBR layer and the second DBR layer; an insulating layer formed over the second DBR layer; and a surface conductive layer formed over the insulating layer. In the surface emitting laser element, a first opening, which exposes the insulating layer and overlaps with the active layer when viewed in a thickness direction of the first DBR layer, is formed in the surface conductive layer, and the first opening extends when viewed in the thickness direction.
    Type: Grant
    Filed: December 5, 2017
    Date of Patent: March 5, 2019
    Assignee: Rohm Co., Ltd.
    Inventors: Dai Onishi, Masashi Yamamoto, Daiju Takamizu
  • Publication number: 20180198255
    Abstract: A surface emitting laser element includes a first distribution Bragg reflector (DBR) layer having a first conductivity type; a second DBR layer having a second conductivity type opposite to the first conductivity type; an active layer located between the first DBR layer and the second DBR layer; an insulating layer formed over the second DBR layer; and a surface conductive layer formed over the insulating layer. In the surface emitting laser element, a first opening, which exposes the insulating layer and overlaps with the active layer when viewed in a thickness direction of the first DBR layer, is formed in the surface conductive layer, and the first opening extends when viewed in the thickness direction.
    Type: Application
    Filed: December 5, 2017
    Publication date: July 12, 2018
    Inventors: Dai ONISHI, Masashi YAMAMOTO, Daiju TAKAMIZU