Patent ID: 8055319
Filing Date: 2011-11-08
Classification: A61B

Abstract:
1. An earphone comprising: a speaker for outputting a sound wave; an optical circuit having a light source, disposed circumferentially around the speaker, configured to generate and output a first light, the first light being output towards a living body to produce a second light reflected from the living body, the optical circuit generating a living body signal that is obtained by detecting and photoelectrically converting the second light into an electric signal, and the optical circuit further having a light guide member for guiding the first and second lights; and a sensor strip, disposed circumferentially around the optical circuit, configured to output the first light from the optical circuit towards the living body, and outputting the second light reflected from the living body to the optical circuit; wherein the sensor strip includes at least one light extracting member and at least one light coupling member, each disposed alongside the light guide member, the light extracting member outputting the first light from the light guide member through contact with the light guide member and the light coupling member coupling the second light to the light guide member through contact with the light guide member.