Patents by Inventor Toshimasa Tamura

Toshimasa Tamura 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).

  • External resonator type of variable-wavelength semiconductor laser light source
    Patent number: 5982794
    Abstract: An external resonator type variable-wavelength LD light source which can compensate errors of a change in an oscillation wavelength caused by a change in an LD driving current, a change in the oscillation wavelength caused by a change in a temperature of an entire light source unit, a difference between set and actual wavelengths caused by mechanical factors to thereby ensure a wavelength reproducibility of 0.001 nm even when the LD driving current or operational temperature varies.
    Type: Grant
    Filed: December 17, 1997
    Date of Patent: November 9, 1999
    Assignee: Ando Electric Co., Ltd.
    Inventor: Toshimasa Tamura