Search International and National Patent Collections
|1. (WO2017057051) DIFFUSION LENS, LIGHT EMITTING APPARATUS, AND INJECTION MOLDING MOLD FOR DIFFUSION LENS|
|Applicants:||IP LABO CORPORATION
|Title:||DIFFUSION LENS, LIGHT EMITTING APPARATUS, AND INJECTION MOLDING MOLD FOR DIFFUSION LENS|
[Problem] To provide a diffusion lens that has a high degree of freedom for designing a surface shape, that can be easily designed and molded, and that is capable of reducing variation in luminance. [Solution] A lens (4) according to the present invention has a circular shape in a plan view, wherein an obverse surface (6) and a reverse surface (8) are each formed to be substantially symmetrical with respect to the center axis X passing through the center of the circular shape, a recessed incident part (9), on which a light from an LED (2) placed such that an optical axis matches the center axis X is incident, is provided in the central portion of the reverse surface (8), and the reverse surface (8) is formed into a tapered shape inclined upward at a predetermined angle when viewed from the incident part (9) side.