| 摘要 |
<p>PURPOSE:To enable to concentrate the optical transfer efficiency in a desired extent and to produce an optical coupler by a method wherein titanium oxide is kneaded in a silicone resin, which is used as a light-reflecting resin, in relation to the respective transfer efficiency of the optical semiconductors and the concentration of titanium oxide in the resin is made higher in such a way as to contain more a light-transmitting resin than that of the surface side. CONSTITUTION:A light-emitting optical semiconductor 1 and a light-receiving optical semiconductor 2 are placed on mutually adjacent lead wires 3 and 3 and an optical coupler is constituted by covering the optical semiconductors 1 and 2 with a light-transmitting resin 4 and a light-reflecting resin 5. The light-reflecting resin 5 has been made to knead titanium oxide of 5-30wt% in the silicone resin, which is used as the light-reflecting resin, in relation to the respective transfer efficiency of the abovementioned semiconductors 1 and 2 and the concentration thereof on the light-transmitting resin 4 side has been made higher than that of the surface side thereof. For example, the kneading amount of titanium oxide is selected between 5-30wt% according to the characteristics of the light-receiving element at a time before or just after the light-transmitting resin 4 is or was adhered, and after being dropped, the light- reflecting resin 5 is left intact for a prescribed time under normal temperatures or at moderate high temperatures, at which the resin viscosity is increased, and is made to cure after titanium oxide settled down.</p> |
