Optoelectric sensor e.g. for fire alarms, has metallic mirror coating on transparent material which covers LED and light sensors

摘要

A transparent material (4) covers light sensors (6) and LED (1) formed on a substrate (10). A mirror coating (5) is formed on light permeable material, by metallization, over which an opaque layer (9) is deposited. An Independent claim is also included for gas sensor array.