Lens, optical imaging lens set and method for forming a lens

A method for forming a lens, comprising the following steps:

• a) providing a substrate, the substrate including a ring-shaped recess;
• b) filling an opaque material in the ring-shaped recess;
• c) providing at least one stamping head which has at least one top portion, the stamping head contacting the opaque material and the opaque material being attached on the top portion;
• d) making the stamping head with the opaque material contact a lens body, and printing the opaque material on the lens body, wherein the lens body includes an optical effective part and an extending part, the optical effective part is the region that allows light to pass through, the extending part is a ring-shaped structure surrounding the periphery region of the optical effective part, the extending part has at least one annular surface, and the opaque material is printed on one of the annular surfaces of the extending part;
• and
• e) removing the stamping head, and cooling the opaque material down to form a solid opaque layer.

A method for forming a lens, at least comprising the following steps:

• a) providing a jig comprising a first plate, the first plate comprising at least one recess disposed on the top surface of the first plate, and at least one arc-shaped hole disposed on the inner surface of the recess, wherein the arc-shaped holes are arranged in a ring-shape, and extend through the first plate;
• b) putting a lens body into the recess, the lens body including an optical effective part and an extending part, wherein the optical effective part is the region that allows light to pass through, and the extending part is a ring-shaped structure, surrounding the periphery region of the optical effective part, and the extending part has an annular surface, the position of the extending part corresponding to the position of the arc-shaped hole of the first plate;
• and
• c) using an evaporation method to either vaporize a liquid opaque material into a gaseous opaque steam or sublimate a solid opaque material into the gaseous opaque steam, the gaseous opaque steam attaching on the lens body through the arc-shaped hole, and the gaseous opaque steam cooling down to forma solid opaque layer.