Patent ID: 7635873

Claim:
A semiconductor light emitting device comprising: a casing having a concave-shaped cavity with an opening and a bottom portion; a semiconductor light emitting element located adjacent the bottom portion of the cavity and having a central light radiation direction directed forward along an optical axis of the light emitting device; and a resin layer located in an interior portion of the cavity, the resin layer containing a wavelength conversion material and being formed in a convex shape in the light radiation direction of the light emitting element, the resin layer including a first layer with a high density of the wavelength conversion material located near a surface of the convex shape and a second layer located adjacent the first layer and including a wavelength conversion material, the second layer having a lower density of wavelength conversion material as compared to a density of wavelength material of the layer, wherein the second layer is located in the light radiation direction of the semiconductor light emitting element and between the first layer and the semiconductor light emitting element in the light radiation direction of the semiconductor light emitting element such that the optical axis of the device extends from the semiconductor light emitting element and intersects both the first layer and second layer, wherein the cavity is composed of a first cavity and a second cavity, the first cavity having a truncated cone-shaped inner peripheral surface that opens outward along the light radiation direction of the light emitting element, the second cavity being positioned above the first cavity and having a substantially circular cylindrically shaped inner peripheral surface that is a continuous extension of the truncated cone-shaped inner peripheral surface and containing a common virtual surface with the first cavity; at least one of the truncated cone-shaped inner peripheral surface and the substantially circular cylindrically shaped inner peripheral surface includes a reflective surface; and the wavelength conversion material within the peripheral portion of the first layer accumulates along the substantially circular cylindrically shaped inner peripheral surface of the second cavity.