Patent ID: 6735373
Filing Date: 2004-05-11
Classification: G02B

Abstract:
A plane light source unit comprising:a plane light pipe including upper and lower surfaces and an incidence side surface which is one of side surfaces between said upper and lower surfaces; and a linear light pipe including a light supply surface and having a refractive index higher than that of said plane light pipe; and at least one point light source being disposed on said linear light pipe, wherein light incident from said at least one point light source is converted into light of a linear light source by said linear light pipe, and wherein said linear light pipe is disposed so as to make said light supply surface face said incidence side surface of said plane light pipe, and light of said linear light source exiting from said light supply surface so as to be incident on said incidence side surface is converted into light of a plane light source by means of said plane light pipe.