Patent 7916383 was granted and assigned to NGK Insulators on March, 2011 by the United States Patent and Trademark Office.
A wavelength conversion device includes a supporting body, a wavelength conversion substrate of a Z-plate of a ferroelectric single crystal with a periodic domain inversion structure formed therein and having a thickness “T” of 10 μm or more and 100 μm or less, a buffer layer provided on a bottom face of the wavelength conversion substrate, and an organic resin adhesive layer adhering the supporting body and buffer layer with a thickness of 0.6 μm or more and 2.0 μm or less.