| 摘要 |
PROBLEM TO BE SOLVED: To provide a maximum laying coefficient, extremely uniform spot size and luminance, an optimum distance from a light-receiving element, and good lens quality, by causing an intermediate layer or a spacer layer to have a predetermined thickness so that the focal length of a convex, that is, a microlens, becomes closer to the position of an opto-electronic element. SOLUTION: A board 12 is formed on which an opto-electronic element 14 including a light-receiving element and a light-emitting element is mounted. An optical transmissive layer, that is, an intermediate layer 16, made of a transmissive polymer or a dielectric material as a selected material containing glass covers the board 12 and the opto-electronic element 14. The outer surface is provided on the lateral part and the top part of the intermediate layer 16, and has a ridge-shaped pattern having a protruding portion and a sunk portion. A group of microlens elements 18 are not in contact with one another and are arranged at a close distance from one another. The thickness of the optical transmissive layer 16 is selected, and the spot size S of a transmitted light is predetermined so that the transmitted light falls on the opto- electronic element 14, and so that the spot size diameter ds of the transmitted light becomes smaller than the diameter dp of the photosensitive element. |
