Method and apparatus for illuminating a spot inside of a tunnel

Details Method and apparatus for illuminating a spot inside of a tunnel Method and apparatus for illuminating a spot inside of a tunnel

1984-06-01

1986-02-25

Wintercorn, Richard A.

350 961, G02B 1700, G02B 514

Patent

active

045726132

ABSTRACT:
A method for illuminating a spot inside a tunnel of a highway by the use of a solar ray collecting device which is to be used to focus a solar ray and guide it into an optical conductor. The solar ray transmitted through the optical conductor would illuminate an entrance portion of the tunnel and a light-emitting portion of the optical conductor would disperse so as to gradually weaken the illumination inside the tunnel in accordance with an increase of distance between the entrance portion and a spot to be illuminated in an inner space of said tunnel.

REFERENCES:
patent: 4297000 (1981-10-01), Fries
patent: 4302069 (1981-11-01), Niemi
patent: 4411490 (1983-10-01), Daniel

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