Patents by Inventor Katuhiko Nisitani

Katuhiko Nisitani 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).

  • Semiconductor light emitting device having strong directivity of light emission
    Patent number: 5457328
    Abstract: A semiconductor light emitting device has an emittive layer formed on a semiconductor substrate, the emittive layer which emits light by being activated with an electric current. Between the substrate and the emittive layer, a reflective layer is formed. In addition, an electrode, which has an aperture for transmitting light emission to the outside of this device, is provided on the emittive layer. In such a structure, at least either one of the reflective layer or the emittive layer is selectively formed right under the aperture formed in the electrode and has the same area as that of the aperture. According to this structure, the emitted light generated laterally from this device is so suppressed that the directivity of light emission is greatly improved in this device.
    Type: Grant
    Filed: June 20, 1994
    Date of Patent: October 10, 1995
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Sumio Ishimatsu, Katuhiko Nisitani