Patent ID: 6883934
Filing Date: 2005-04-26
Classification: G02B,G02F

Abstract:
1. An illumination device comprising: a light source device which emits light; and a light guide having a light receiving plane which receives light from the light source device and a light exiting plane which exits the light; wherein the light source device comprises a light emitting device and a lens which is provided on a light emitting portion of the light emitting device and facing the light guide so as to condense the light emitted from the light emitting device on the light guide; wherein the lens has a property that provides directivity of exiting light in one direction that is higher than directivity of exiting light in a direction perpendicular to the one direction, the one direction being set to a height direction of the light guide, and the perpendicular direction being set to a width direction of the light guide, the lens having a constant cross-section along a first axis thereof and a varying cross-section along a second axis thereof, the second axis being perpendicular to the first axis.