TRANSMISSION TYPE OPTICAL ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide a transmission type optical element capable of reducing the cost of a lens.SOLUTION: In a lens unit 13 superposedly arranged on an LED 14 and having an incidence surface 15B curved in a convex shape with respect to an emission surface 15A, a thickness thinning part 30 is provided at a portion below a surface V connecting a light emission point Q to be a center of a light emitting part of the LED 14 and a boundary part 32 of an effective incidence surface 15B1 effective for optical control among the incidence surface 15B, and is subjected to resin molding.