Patent ID: 7872410

Claim:
A light emitting device, comprising: a light emitting element; a substrate comprising a flat mounting surface for mounting the light emitting element thereon; a sealing part for the light emitting element on the mounting surface of the substrate, the sealing part comprising glass including a phosphor to be excited by light emitted from the light emitting element to radiate a wavelength conversion light, the sealing part being shaped like a rectangular solid wherein a lateral length is defined as a distance between a center of a bottom surface of the sealing part bonded to the mounting surface and a side face perpendicular to the mounting surface, a vertical length is defined as a distance between the mounting surface and a top surface of the sealing part, and at least one of the lateral length is longer than the vertical length; and a transparent member formed on the top surface of the sealing part with a vertical dimension, the transparent member including the phosphor at a concentration higher than the sealing part, wherein the device satisfies the relationship: ( L×a )≦( t 1 ×a+t 2 ×b )≦( L×a )×√{square root over (2)} where L represents the lateral length, t 1 represents the vertical length, a represents the concentration of the phosphor per unit volume in the sealing part, t 2 represents the vertical dimension, and b represents the concentration of the phosphor per unit volume in the transparent member.