LENS MEMBER AND LIGHT-EMITTING DEVICE USING SAME

摘要

A lens member is disclosed with thickness reduced and light collection maintained, and a light-emitting device with thickness reduced and light collection maintained. The lens member includes a light-incident side (10a); a light-exit side (10b) that is opposite to the light-incident side (10a), a Fresnel lens (14) arranged on a center axis (AX) that passes through a center of the light-incident side (10a), and a diffraction grating structure (15) arranged around a periphery of the Fresnel lens (14) and having a center through which the center axis (AX) passes. Also, it is disclosed that the Fresnel lens (14) may include a first Fresnel lens (14a) and a second Fresnel lens (14b), the first Fresnel lens includes annular prisms that are divided from a convex lens and having a center through which the center axis (AX) of the light-incident side (10a) passes, and the second Fresnel lens (14b) includes annular prisms that are divided from a TIR lens and arranged around the periphery of the first Fresnel lens (14a), centering around the center axis (AX) of the light-incident side (10a).