Patent ID: 6644824
Filing Date: 2003-11-11
Classification: G02B

Abstract:
A light unit, comprising:a point light source; a columnar light guide that reflects light emitted from said point light source to emit generally band-shaped light; and a rectangular plate-shaped light guide that receives the light emitted from said columnar light guide, through a facet thereof, and reflects and refracts the light received through said facet, using a prism surface thereof having recesses and projections formed thereon and forming a plurality of lineal parallel ridge lines, so that planar light is emitted from a light applied surface thereof which is opposite said prism surface, wherein said point light source is arranged only at an end of a facet of said columnar light guide at which the angle between a direction of a light emitted from said point light source and said ridge lines on said rectangular plate-shaped light guide is acute, such that said ridge lines incline away from said point light source.