摘要 |
<P>PROBLEM TO BE SOLVED: To provide an LED lighting device, an LED lighting fixture and a lens for the LED lighting device capable of obtaining freedom of optical design for performing highly precise light distribution control, and capable of reducing deterioration or light-distribution characteristics change of resin constructing the lens due to heat radiation of the LED. <P>SOLUTION: The lens arranged at a light emission side of an LED light source having a plurality of LEDs includes an incident surface to which emission light from the LED light source enters and an emission surface from which the emission light is radiated outside. Further, the LED light source and the incident surface of the lens are of non-contact. Moreover, while the lens consists of plastics, 4≤Φ≤7 where Φ(mm) is a maximum size of the lens cross-section perpendicular to the optical axis, 2.8≤LL≤4.5 where LL(mm) is a length of a foot part of the lens in an optical axis direction, and 1.8≤SD≤2.2 where SD(mm) is a minimum distance between the light emission part of the LED light source and the incident surface of the lens in the optical axis direction are satisfied. <P>COPYRIGHT: (C)2012,JPO&INPIT |