| 摘要 |
PROBLEM TO BE SOLVED: To materialize downsizing and cost down. SOLUTION: One photoelectric transfer element 3 is arranged, with its center in conformity with the bottom of the housing 2 whose reflective face 2a is made as a paraboloid. In addition, a transparent board 5 where the other photoelectric transfer element 4 is mounted is opposed to the other photoelectric transfer element 3, being positioned in front of the housing 2 so that the other photoelectric transfer element 4 may be on the side of the reflective face 2a and that it may conforms to the focus of the reflective face 2a, and transparent resin 6 is charged in the space between the reflective face 2a and the transparent substrate 5; this is such a completely coaxial composite optical element. Hereby, one reflective face will do, and the constitution and the production process become simple, whereby downsizing and cost down become possible. |
