Patent ID: 7824049

Claim:
An illumination device having a plurality of sealing structures, each of said sealing structures including at least one light-emitting diode mounted on a wiring conductor formed on a substrate, a high refractive index transparent material member sealing said light-emitting diode and a low refractive index transparent material member sealing said high refractive index transparent material member, wherein said high refractive index transparent material member which covers an upper surface of said light-emitting diode has a recess in an upper surface on an opposite side of said substrate and serves to increase a divergence angle of light radiation from said light-emitting diode, and wherein said high refractive index transparent material member is structured so as to satisfy a relation H>(L/2)/tan {(sin −1 (n 2 /n 1 )}, where H represents a thickness of said high refractive index transparent material member measured at a central portion of the upper surface of said light emitting diode to a bottom of the recess, L represents a length of one side of said upper surface of said light emitting diode, n 1 represents a refractive index of said high refractive index transparent material member and n 2 represents a refractive index of said low refractive index transparent material member.