LIGHTING STRUCTURE, LIGHTING METHOD, AND PORTABLE COMPUTER

摘要

PROBLEM TO BE SOLVED: To provide a lighting structure suitable for keyboard light of a portable computer.

SOLUTION: A light guide body 11 has an emission surface containing a position Q5 formed at a tip part. The position Q5 on the emission surface is protruded by a distance L1 from a surface 205 of a wall. A light beam 106 progressing on a light axis is incident in a radiation surface at the position Q5. A tangent of the position Q5 is parallel to the surface 205 of the wall 201. An incident angle of the light beam 106 to the position Q5 is to be set nearly at a critical angle. The light beam irradiated from a light source 23 is refracted with a refracting angle from a maximum refracting angle to a predetermined range as the beam is incident into and transmitted through an emission surface. Therefore, a place from a position near the surface of a wall of an irradiated surface 203 to a position separated by a distance L2 can be illuminated.

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