BIDIRECTIONAL LIGHT TRANSMITTING DEVICE

摘要

PROBLEM TO BE SOLVED: To solve such a problem that it is difficult to make a light transmitting device small in size because a light sending and a receiving device are mutually separated and use tow optical fibers. SOLUTION: An LED 7 of LD and a light receiving IC 12 are mounted in a base substrate 16 having a through-hole electrode 17. A convex lens 9a right above LED 7 or LD is sealed with a translucent sealing resin 9 so that a concave lens 9b is located right above IC 12. After the sealing resin 9 is divided into a light emitting device 20 and a light receiving device 21 by dicing so as to be divided half, and the whole face of the sealing resin 9 excluding lenses 9a and 9b is covered with an optical intervention preventing protection membrane 18, both devices 20 and 31 are combined with the divided faces facing each other and jointed and fixed with an adhesive 22. It helps to provide a one-core two-way light transmitting device which can be miniaturized and is surface-mountable and at a low cost.