Process and method for producing lens with multi-prescription by one mould

Abstract

The invention relates to a process and a method for producing lens with multi-prescription by one mould. The process comprises that: a male mould core and a female mould core are matched to form the lens with certain degrees; the male mould core or the female mould core is fixed; another mould core is replaced to change the degree of the lens; a reduction formula is as follows: DS=100/f, f=n*r1*r2/(n-1)*(n*(r2-r1)+(n-1)*d). f is foci of the lens; n is refractive index; d is the central thickness of the lens; r1 and r2 are surface curvature radius of two surfaces of the lens; DS is degree; G blend is equal to n/r; n is refractive index; r is curvature radius; and DS is equal to the difference of G front blend (convex) and G rear blend (concave). Through calculation of the formula, a positive number is obtained, namely short sight; a negative number is obtained, namely presbyopia; under the condition of uniform diameter, when the female mould core is fixed, the male mould core is changed; the needed lens specification also can be produced; and the process and the method can reduce the cost and greatly improve the productivity simultaneously.

Description

Technical field: [0001] The invention belongs to the lens processing industry and relates to a lens processing method, in particular to a production process and method of one mold with multiple configurations. Background technique: [0002] In the processing technology of PC lenses, the power of the lens is realized by the mold core, including a male mold core and a female mold core. The combination of the two can produce a lens with a degree. The current situation of the existing PC lens market and industry is , only one degree of lens can be produced on the same mold base, that is, a male mold and a female mold are combined to produce a lens of one degree. The specification of the lens is a new specification (that is, the degree) at intervals of 25 degrees. , taking myopia as an example, from plain light to 600 degrees of myopia, there are a total of 225 degrees, each degree needs to be formed by two mold cores, the number of mold cores must be at least 1800, not only the ...

AI Technical Summary

Problems solved by technology

[0002] In the processing technology of PC lenses, the power of the lens is realized by the mold core, including a male mold core and a female mold core. The combination of the two can produce a lens with a degree. The current situation of the existing PC lens market and industry is , only one degree of lens can be produced on the same mold base, that is, a male mold and a female mold are combined to produce a lens of one degree. The specification of the lens is a new specification (that is, the degree) at intervals of 25 degrees. , taking myopia as an example, from plain light to 600 degrees of myopia, there are a total of 225 degrees, each degree needs to be formed by two mold cores, the number of mold cores must be at least 1800, not only the cost is high, but also if you need to change the degree, The male mold and the female mold must be replaced together, which is time-consuming, labor-intensive and low in productivity

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