| 摘要 |
PROBLEM TO BE SOLVED: To provide a spotlight that can achieve high fixture efficiency and can obtain an irradiation face with homogeneousness and without unevenness. SOLUTION: At a backside 15a of a Fresnel lens 15, a turtleback pattern 20 having a turtleback 21 with a different curvature radius is installed; at the near center of the Fresnel lens 15, a turtleback 21a with a small curvature radius is arranged; and at the peripheral part of the Fresnel lens 15, a turtleback 21b with a large curvature radius is arranged. Accordingly, enlargement of refraction around the center which makes high the center illuminance of the irradiation face to become like eyeball is prevented. Moreover, ring irregularity due to the Fresnel lens 15 is reduced, and the irradiation face with homogeneousness and without unevenness is available. COPYRIGHT: (C)2009,JPO&INPIT
|
