Fiber optic coupler having total internal reflecting surface

Abstract From the Canadian patent

A coupler for light between the termination of an optical fiber and one or more detector or emitter elements in which the optical path between the termination and the detectors and emitters includes one or more focussing surfaces. The coupler is designed as a molded plastic body adapted to precisely position the optical fiber termination and the emitters and detectors so that the optical path between them via the focussing surfaces couples light efficiently. The focussing surfaces are molded into the coupler during manufacture and are preferably angled to the radiation to provide total internal reflection avoiding, reflective coatings. In the case where the focussing surfaces are reflecting …