White LED lighting device, and optical lens

摘要

Disclosed are a white LED lighting device and an optical lens used in it. The white LED lighting device comprises a white LED and an optical lens. The white LED includes: a LED chip which emits blue light; and a fluorescent material which is excited by emission light of the LED chip and converts a wavelength into fluorescence of a complementary color of blue. The optical lens is formed with a scattering light guide which is given uniform scattering power in terms of a volume. The scattering light guide includes scattering particles for the scattering efficiency in a short wavelength range of light to be higher than that in a long wavelength range of light.

主权项

1. A white LED lighting device comprising a white LED and an optical lens arranged such that respective optical axes substantially match, wherein:
the white LED includes: a LED chip which emits light having a peak wavelength in a wavelength range of blue; and a fluorescent material which is excited by emission light of the LED chip and converts a wavelength into fluorescence of a color tone of yellow or greenish yellow which is a complementary color of blue; the optical lens has: a light incident portion which allows the emission light to be incident from the white LED; and a light radiating portion which emits light to an outside, and is formed with a scattering guide which is given uniform scattering power in terms of a volume; and the scattering light guide includes scattering particles most of which have a predetermined particle diameter for the scattering efficiency upon the scattering power in a short wavelength range of light to be higher than that in a long wavelength range of light; wherein the light incident portion has a concave shape on a side of the white LED; and a convex lens is disposed in an upper surface of the concave shape, and a tapered surface is formed on a side surface of the concave shape to widen toward the white LED.