| 摘要 |
PURPOSE:To eliminate the need to optical axis adjustment between a condenser lens and a light guide and to reduce Fresnel loss by forming the condenser lens on and end surface of the light guide in one body for the optical coupling structure between the planar type light guide and a light source. CONSTITUTION:The light guide 2 is formed on a substrate 3, and the condenser lens 4 for guiding projection light 5 from the light source 1 in the light guide 2 is formed integrally on the end surface of the light guide 2. This lens 4 can be formed by a dip method. Namely, the end-surface side edge of the light guide 2 on the substrate 3 is dipped in a liquid lens material which is transparent and has high viscosity normally, and the substrate 3 is lifted vertically; and the lens material is set at time in a drop shape at the edge, thus forming the lens 4. |
