| 摘要 |
PROBLEM TO BE SOLVED: To linearly change a width measurement of bright stripes formed on an emission face of a light guide lens.SOLUTION: In an LED lighting device 100 in which, by light irradiated from an LED light source 1, transmitting an incident face 2a and an emission face 2b of a light guide lens 2, transmitting an incident part 3a of a light guide lens 3, internally reflected by a reflection part 3c of the light guide lens 3, internally reflected by prism cuts 3b1a of a reflection face 3b1 of an emission part 3b of the light guide lens 3, and transmitting an emission face 3b2 of the emission part 3b of the light guide lens 3, bright stripes BB extending almost in parallel with an X axis direction are formed on the emission face 3b2, when the emission face 3b2 is viewed from an observation position VP opposed to the emission face 3b2 of the light guide lens 3, a width measurement WBB of a Y-axis direction of the bright stripes BB formed on the emission face 3b2 is linearly changed in accordance with relative movement in the X-axis direction of the light guide lens 3 against an LED light source 1 and a light guide lens 2. |
