Optocoupler with Surface Functional Coating Layer

摘要

An optocoupler comprises an optically reflective compound 30 comprising silicone and inner and outer surfaces. A molding compound 28 surrounds and encapsulates at leastportions of the outer surfaces of the optically reflective compound 30 to form an enclosure. A surface functional layer is provided on the optically reflective compound 30 to promote adhesion and increase breakdown voltages between inner walls of the enclosure and the outer surfaces of the optically reflective compound 30. An optically transmissive compound 48 may be disposed within the reflective compound. The outer walls of the reflective compound may be covalently bonded to the inner walls of the molding compound. The surface functional layer is formed using a plasma radiation process.