Patent ID: 8641238

Claim:
A light source module, comprising: a circuit board; a lens disposed on a surface of the circuit board, wherein the lens is in the form of a cylinder, and comprises: a side surface; an upper surface having a first recessed portion, wherein the first recessed portion comprises: a flat surface located on the upper surface, wherein the flat surface defines a mounting region on the surface of the circuit board, and the mounting region is an orthogonal projection of the flat surface onto the surface of the board; and a curved side surface surrounding the flat surface and stretching to the flat surface from the side surface to the flat surface to form the first recessed portion to form the first recessed portion; a lower surface in conjunction with the circuit board, wherein the lower surface has a second recessed portion, and the second recess portion defines a recessed space and comprises: a curved surface opposite to the flat surface, wherein the curved surface is a convex surface; and a sidewall portion surrounding the recessed space, wherein the sidewall portion has an inner surface and the inner surface is concaved; at least one light emitting diode (LED) chip disposed on the mounting region of the circuit board to enable light emitted by the at least one LED chip to be uniformly scattered out of the lens by the lens; and a lamp screen covering the lens for protecting the lens and diffusing the light passing through the lens, thereby enabling the light module to have a light emission angle of more than 300 degrees.