Patents by Inventor Tomomasa Tanaka

Tomomasa Tanaka 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).

  • Publication number: 20240339813
    Abstract: A surface emitting device includes a semiconductor layer including a first crystal material, a reflection layer formed on the semiconductor layer, including a second crystal material of which a lattice constant or a crystal structure is different from the first crystal material, and having a mesa shape, and a light constriction region that is formed in a portion of the reflection layer and controls optical confinement.
    Type: Application
    Filed: March 9, 2022
    Publication date: October 10, 2024
    Inventors: Mikihiro YOKOZEKI, Hiroshi NAKAJIMA, Daiji KASAHARA, Michinori SHIOMI, Tomomasa WATANABE, Masayuki TANAKA
  • Publication number: 20240313506
    Abstract: A surface emitting device according to an embodiment of the present disclosure includes: a first reflective layer; a first semiconductor layer of a first conductive type, the first semiconductor layer being stacked on the first reflective layer; an active layer stacked on the first semiconductor layer; a second semiconductor layer of a second conductive type that is a conductive type opposite to the first conductive type, the second semiconductor layer being stacked on the active layer; a tunnel junction layer stacked on the second semiconductor layer; a third semiconductor layer of the first conductive type, the third semiconductor layer being stacked on the tunnel junction layer; a second reflective layer stacked on the third semiconductor layer, at a side opposite to a side of the first reflective layer; a dielectric layer formed, through non-selective oxidation, between the second semiconductor layer and the third semiconductor layer or between the third semiconductor layer and the second reflective layer
    Type: Application
    Filed: March 3, 2022
    Publication date: September 19, 2024
    Inventors: Daiji KASAHARA, Hiroshi NAKAJIMA, Michinori SHIOMI, Masayuki TANAKA, Tomomasa WATANABE, Masashi TAKANOHASHI, Mikihiro YOKOZEKI
  • Publication number: 20240305064
    Abstract: To provide a surface-emitting laser that can achieve further reduction of diffraction loss, further improvement of heat dissipation, further improvement of yield, and further improvement of reliability. To provide a surface-emitting laser including a substrate and a vertical resonator structure formed on the substrate, in which the vertical resonator structure includes at least one element selected from the group consisting of In, Ga, Al, N, As, and P, and includes at least an active layer, an upper DBR layer, a lower DBR layer, the upper DBR layer and the lower DBR layer are formed with the active layer interposed therebetween, and the lower DBR layer includes at least one transparent conductive layer that contains a transparent conductive material including a non III-V semiconductor.
    Type: Application
    Filed: January 12, 2022
    Publication date: September 12, 2024
    Inventors: Tomomasa WATANABE, Hiroshi NAKAJIMA, Masayuki TANAKA, Mikihiro YOKOZEKI
  • Patent number: 5092534
    Abstract: A tensioning apparatus for setting and controlling the level of a tension on a wire in a coil winding machine. The apparatus includes a rotatable main tension pulley which applies a tension to the wire, a magnet brake for applying a braking torque to the main pulley, and an auxiliary tension pulley contacting a portion of the wire on the downstream side of the main tension pulley as viewed in the direction of movement of the wire. A rotationally urged tension bar having one end rotatably carrying the auxiliary tension pulley is rotationally urged by a spring in such a direction as to tense the wire, thereby resiliently absorbing a variation in the tension of the wire. The apparatus further comprises a brake force adjusting mechanism for adjusting the effect of the magnet brake, and a back tension adjusting mechanism for adjusting the force of the spring to enable adjustment of the urging force acting on the tension bar.
    Type: Grant
    Filed: November 15, 1990
    Date of Patent: March 3, 1992
    Assignee: Tanaka Seiki Co., Ltd.
    Inventor: Tomomasa Tanaka
  • Patent number: 4576288
    Abstract: In a card sorting machine, cards having coded tooth trains at the lower edges and magnetic pieces at the front edges are placed on a group of select bars. By selectively raising the select bars, the magnetic piece of the selected cards are attracted to a selecting magnet for having the cards moved at first for one pitch in the horizontal direction and then in an oblique upward direction. A card holding magnet is further provided which holds the selected cards at the oblique upward position upon transfer from the selecting magnet.
    Type: Grant
    Filed: April 2, 1984
    Date of Patent: March 18, 1986
    Assignee: Tanaka Seiko Co. Ltd.
    Inventor: Tomomasa Tanaka