| 摘要 |
PROBLEM TO BE SOLVED: To suitably illuminate a desired irradiation range.SOLUTION: A lighting appliance 1 comprises an LED 2 which substantially-radially emits light frontward with an optical axis Ax along a fore-and-aft direction as a center, and a light guide lens 3 arranged in front of the LED 2. The light guide lens 3 has: an incident face 31 which is arranged at a portion opposing the LED 2 out of a rear face, and formed into a substantially-semi spherical shape with a position of the LED 2 as a center; a conical protrusion 33 which is protrusively arranged frontward in front of the LED 2 out of a front face with a position on the optical axis Ax as a tip; a front optical face 34 which is arranged at a periphery of the protrusion 33 out of a front face, formed into a hyperboloid shape having a focus point F located in front of the optical axis Ax, and can emit light frontward while internally reflecting light from the incident face 31 to a rear oblique sideway; and a rear reflection face 32 which is arranged at a periphery of the incident face 31 out of a rear face, formed into a free curved face shape having the same focus point F as the front optical face 34, and internally reflects light which is internally reflected at the front optical face 34. |
