| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical wave-guide manufactured inexpensively and easily. SOLUTION: A Fresnel lens structure part 22 is formed in a prescribed position of an upper face 14A of a light-guide medium 14, and an optical wave-guide 10 is constituted by the structure part 22 and a lower face 14B of the medium 14 of its opposed face. A focal point of the Fresnel lens structure part 22 is set to be on the lower face 14B. Since the optical wave-guide 10 is formed in the above constitution only by imparting a form of the structure part 22 on the upper face 14A of the light-guide medium 14, a troublesome and time- consuming process such as thin-film formation by vacuum deposition is not required to allow manufacturing in a short time. An inexpensive optical wave- guide 10 is manufactured easily thereby. |
