Patent ID: 8419233

Claim:
A lampshade structure for LED lamps, comprising: at least one light-diffusing bowl structure located on top of the lampshade, each of the light-diffusing bowl structure further having thereof an exterior curve wall and an interior curve wall, the exterior curve wall having a curvature radius Re and a curvature center Ce, the interior curve wall having a curvature radius Ri and a curvature center Ci, both the Ce and the Ci being located exteriorly to the lampshade structure; a lower end, located oppositely to said at least one diffusing bowl structure; an interior space for accommodating at least one LED close to the lower end; and a sidewall, connecting said at least one light-diffusing bowl structure and the lower end in a manner of encircling the interior space; wherein said sidewall further has a surface structure formed as a plurality of piling rings, each of the piling rings having a semi-circle cross section.