| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lens 340 controlling directionality of light, with high productivity and capable of forming it at low cost. <P>SOLUTION: The lens 340 is provided with an emission surface 342 having a light-incident concave part 341 for taking in light from LEDs 321 and an emission concave part 343 of which a part near the center is depressed in concave, and emitting light taken in from the light-incident concave part 341, and a reflective surface 344 connecting between the light-incident concave part 341 and the emission surface 342 and reflecting the light taken in from the light-incident concave part 341 to the emission surface 342 side so as to have intensity distributions Pr, Pl which are to be the maximum light intensity of angles shifted to a direction moving away from a direction parallel to an optical axis L of the LED 321. The light reaching the reflective surface 344 from the LEDs 321 is reflected to a direction moving away from the optical axis L, so that the light going to the emission concave part 343 among the light reflected at the reflective surface 344 is reduced, thereby the diameter of the emission concave part 343 can be made larger. <P>COPYRIGHT: (C)2011,JPO&INPIT |
