Infra-red LEDs for sensing applications

June 03, 2013 // By Graham Prophet
Everlight (Taiwan) has introduced three 850nm HIR (highefficiency infrared) LEDs with a high output power and narrow viewing angles which make them suitable for intelligent touch panels and proximity sensors.

Two of them are top view SMD LEDs suited for proximity sensor applications. The HIR89-01C has a viewing angle of 30° and achieves a very high radiant intensity 55mW/sr at 70mA. The HIR91-01C/L297 with a 40° viewing angle reaches an intensity of 40mW/sr at 70mA. Wide viewing angles with high output power rarely occur with most proximity sensors, making the HIR89 and HIR91 ideal for all proximity sensor applications such as smart phones as well as optical touch panels.

For side-view touch applications smaller than 80 inches, Everlight’s HIR83-01B in a slim SMD package features a radiant intensity of 5mW/sr at 20mA and a viewing angle of 100°(X)/40°(Y). The asymmetric viewing angle is especially suitable for touch panel applications.