Patent ID: 10859249

Abstract:
A wavelength conversion device for laser light including a laser light source that emits laser light having a predetermined wavelength; a first substrate that is light-transmissive; a second substrate that is light-transmissive; a phosphor layer provided between and in surface contact with the first substrate and the second substrate, the phosphor layer converting a wavelength of the laser light; and a gap-maintaining component located between the first substrate and the second substrate, the gap-maintaining component adjusting a thickness of the phosphor layer by maintaining a uniform distance between the first substrate and the second substrate. Each of the first substrate and the second substrate has a thermal conductivity higher than a thermal conductivity of the phosphor layer. The gap-maintaining component is a plurality of thickness adjustment particles that are light-transmissive and have a shape having a substantially equal diameter, and the shape is one of wire-shaped, ring-shaped, and protruding.