| 摘要 |
PROBLEM TO BE SOLVED: To provide an LED lighting device capable of increasing variations on viewability of reflecting surfaces of reflectors.SOLUTION: An LED lighting device 100 is configured such that the inner reflecting surfaces 2a1, 2b1 of concave reflectors 2a, 2b are formed with a rotational paraboloid and the reflectors 2a, 2b are rotated around a center axis 2' substantially parallel with an optical axis 1a' of the LED light source 1a against the LED light source 1a. A light-emitting surface of the LED light source 1a is arranged on a circle CR passing through focal points 2a1a, 2b1a of the inner reflecting surfaces 2a1, 2b1 of the reflectors 2a, 2b and centering on the center axis 2'. When an outer reflecting surface 2a2 of the reflector 2a relatively rotating around the center axis 2' against the LED light source 1a is viewed from an observation position VP so as to make the inner reflecting surface 2b1 of the reflector 2b move to an outer reflecting surface 2a2 side of the reflector 2a, a portion 2a2a of the outer reflecting surface 2a2 of the reflector 2a is viewed in a shining state at first, and then, a portion 2a2b close to the center axis 2' rather than the portion 2a2a is viewed in a shining state, and further, a portion 2a2c close to the center axis 2' rather than the portion 2a2b is viewed in a shining state. |
