| 摘要 |
PROBLEM TO BE SOLVED: To lower profile and reduce costs by a method wherein a circuit substrate forming an electric circuit is integrally provided with an optical func tion part such as light condensing reflection, and selective transmission. SOLUTION: A light emitting element 21, a light receiving element 22, and a signal processing chip 20 are fitted on one plane of an infrared rays transmission element. A circuit substrate 1 is provided on the one plane with a circuit pattern 23 for connecting thereto, and is formed by injection molding using a resin such as transparent and insulated polycarbonte, acrylic, sulfone material or the like, called as an MID substrate. A projection 11 is provided with a reflection film 12 on the surface, constituting a reflection mirror 3 as a reverse face mirror. The reflection mirror 12 is formed by plating, vapor, or the like, and, when increasing noise-resistance as collectively having a filter characteristic of selectively reflecting only a predetermined wavelength (infrared lights), the reflection mirror 12 is formed as a high dielectric multilayer film. |
