Patent ID: 6950598

Claim:
A light emitting head which receives light from a incident light origin and propagates and focuses the light to an exiting light destination, comprising: a first structure section comprising, a first well propagating section which consists of a first low extinction material with attenuation of light substantially low to a negligible extent, the first well propagating section being located along an optical axis from the incident light origin to the exiting light destination, a second well propagating section which consists of a second low extinction material with attenuation of light substantially low to a negligible extent, and whose refractive index is larger than that of the first well propagating section in a bulk material, a pair of the second well propagating sections sandwiching the first well propagating section therebetween in at least one axis-intersecting direction intersecting the optical axis, and a poor propagating section which consists of a material with any propagating characteristics, which may be non-propagative, poorer than that of the second well propagating section in a bulk material, a pair of the poor propagating sections further sandwiching the first and second well propagating sections therebetween from the outside of the second well propagating section in the axis-intersecting direction, and a second structure section being located on one of two sides sandwiching the first structure section in the axis-intersecting direction, the second structure section concentrating light on the first structure section within the range from the incident light origin to the exiting light destination.