| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light guide body which is constituted so as to widely diffuse an emitted light range to the front face of the light guide body and to raise a rendering effect by effectively utilizing point light even while using an LED having a defect that it performs the point light. <P>SOLUTION: The light guide body includes: a protrusive reflection region 21 which is separately arranged opposite to the LED 31 and has a reflection surface which reflects emitted light from the LED 31 in the outer diameter direction; an incident side wall 22 which is projected on the outer diameter side of the protrusive reflection region 21 so as to surround the protrusive reflection region 21 and has a light transmission surface at its inner periphery; a diffusion inner reflection region 23 A with a plurality of inner reflection regions 23a arranged like approximately concentric circles on the outer diameter side of the incident side wall 22 and arranged like a step in the diameter direction; and an emission region 24 which is arranged opposite to the protrusive reflection region 21 and the diffusion inner reflection region 23 A, the emitted light reflected on the protrusive reflection region 21 penetrates the incident side wall 22, is diffused, reflected on each inner reflection surface 23a, and output forward from the emission region 24. <P>COPYRIGHT: (C)2012,JPO&INPIT |
