Light trigger type semiconductor device

摘要

An object of the present invention is to enhance the transmission efficiency of light signals. An output end of a light guide (10) is coupled to a light receiving portion (1a) of a semiconductor substrate (1) with an optical coupling agent (20). Reflection preventing films of silicon dioxide are formed on both the output end and the input end of the light guide (10). Similar reflection preventing films are formed on both surfaces of a light introducing window (42) provided at the input end of the light guide (10), too. The light introducing window (42) is provided to maintain the inside of the device airtight while enabling passage of light signals. Since the reflection preventing films are formed, the transmission efficiency of light signals is high, so that the sensitivity of the device increases.