Wafer level optical lens substrate and fabrication method thereof
A wafer level optical lens substrate including a substrate and at least one lens is provided. The substrate has at least one through hole and at least one flange, wherein each flange is located on a side wall in each through hole. Each lens located in each through hole is embedded with each flange. A method of fabricating a wafer level optical lens substrate and a wafer level optical lens module are also provided respectively.
1. A wafer level optical lens substrate, comprising:
a substrate, having at least one through hole and at least one flange, wherein each flange is located on a side wall in each through hole; and
at least one lens, each located within each through hole and embedded with each flange, and a thickness of each lens being less than a thickness of the substrate.
2. The wafer level optical lens substrate as claimed in claim 1 , wherein the substrate has a first surface and the first surface has at least one alignment hole disposed thereon.
3. The wafer level optical lens substrate as claimed in claim 2 , wherein the substrate has a second surface opposite to the first surface, and the second surface has an alignment protrusion disposed thereon and arranged oppositely to each alignment hole.
4. The wafer level optical lens substrate as claimed in claim 1 , wherein the substrate has a first surface and the first surface has at least one alignment protrusion disposed thereon.
5. The wafer level optical lens substrate as claimed in claim 1 , wherein a shape of the flange located on each side wall is a cuboid.
6. The wafer level optical lens substrate as claimed in claim 1 , wherein a shape of the flange located on each side wall is a trigonal prism.
7. The wafer level optical lens substrate as claimed in claim 6 , wherein the trigonal prism has a first inclined plane and a second inclined plane connected to the first inclined plane.
8. The wafer level optical lens substrate as claimed in claim 1 , wherein a material of the substrate is a light-shielding material or a light-absorbing material.
9. The wafer level optical lens substrate as claimed in claim 8 , wherein the light-shielding material is a black colloid.
10. The wafer level optical lens substrate as claimed in claim 1 , wherein the lens is a convex lens or a concave lens.
11. A method of fabricating a wafer level optical lens substrate, comprising:
providing a substrate;
forming at least one through hole on the substrate and forming a flange on a side wall in each through hole; and
forming a lens on the flange in each through hole and embedding the lens with the flange.
12. The method of fabricating the wafer level optical lens substrate as claimed in claim 11 , wherein the through hole and the flange located on the side wall are formed by a computer numerical control technique, a punching process, or a laser scriber technique.
13. The method of fabricating the wafer level optical lens substrate as claimed in claim 11 , wherein a method of forming the lens on the flange in each through hole and embedding the lens with the flange comprises:
leaning a tenon mold on the flange;
injecting a transparent material into the tenon mold;
curing the transparent material to form the lens; and
removing the tenon mold.
14. The method of fabricating the wafer level optical lens substrate as claimed in claim 11 , the substrate having a first surface and a second surface opposite to the first surface, and the method further comprising:
forming at least one alignment hole on the first surface; and
forming an alignment protrusion opposite to each alignment hole on the second surface.