Mould for optic lens

Abstract

The invention provides a mould for an optic lens. The mould comprises an upper mould and a lower mould, wherein the end face of the lower mould forms a top surface, the outer edge around the top surface serves as an edge portion, and an inwards-recessed cavity is arranged at the center of the top surface. A runner and a sprue are sequentially arranged on the edge of the cavity towards the edge portion, an edge cutting area is defined by the intersecting edge of the cavity and the runner and the lateral wall of the cavity close to two sides of the runner, and the runner is communicated with the sprue through a communication channel. A step is formed at the intersecting position of the bottom surface of the edge cutting area and the bottom surface of the cavity, and the horizontal height of the bottom surface of the cavity is lower than that of the bottom surface of the edge cutting area at the position of the step. The edge of the original cavity close to the runner is inclined, so that when ejected, one side of the mould is free of extrusion of the lateral wall, labor is saved, and the product is not damaged. The step is arranged at the bottom of the cavity, and the deckle edge and the assembly face of the manufactured lens are not on the same plane, so that uneven stacking is avoided.

Description

technical field [0001] The invention belongs to the field of optical molds, in particular to a mold for making optical lenses. Background technique [0002] The production of aspherical lenses by the practical injection method requires high-precision diamond turning methods to produce high-precision injection mold cores with a surface roughness of 25nm or even smaller, so nickel-plating is often used on the surface of the mold core and then precision is performed with a diamond knife. Processing molds, but although the precision can be more precise, it also solves the problem that diamond knives are easy to petrify, but it is inevitable that when making mold cores, the diamond knives will cause burrs when they are closed, even for existing molds. Kernels are released from the mold at right angles, resulting in difficulty in demoulding. The second is the poor circulation of the poured liquid, and these problems will inevitably lead to an increase in the rate of defective pro...

AI Technical Summary

Problems solved by technology

[0002] The production of aspherical lenses by the practical injection method requires high-precision diamond turning methods to produce high-precision injection mold cores with a surface roughness of 25nm or even smaller. Therefore, nickel-plating is often used on the surface of the mold core and then precision is performed with a diamond knife. Processing molds, but although the precision can be more precise, it also solves the problem that diamond knives are easy to petrify, but it is inevitable that when making mold cores, the diamond knives will cause burrs when they are closed, even for existing molds. Kernels are released from the mold at right angles, resulting in difficulty in demoulding

The second is the poor circulation of the poured liquid, these problems will inevitably lead to an increase in the rate of defective products

Images