Method of manufacturing color contact lens

Abstract

A method of manufacturing color contact lens includes the steps of providing a rubber pad having a pressure bearing surface and filling C / M / Y / B coloring agents in a first inkjet printer; causing the first inkjet printer to jet the C / M / Y / B coloring agents on the pressure bearing surface of the rubber pad to form a color image layer; transferring the color image layer from the rubber pad onto an inner surface of a concave mold; injecting a lens material into the concave mold; pressing a convex mold against the concave mold to form a lens layer on the color image layer; and curing the color image layer and the lens layer to form a color contact lens. With the method, the color image layer can be formed using the inkjet printer without an increased thickness, enabling mass production of relatively thin color contact lenses at shortened time and lowered defect rate.

Description

technical field [0001] The invention relates to a method for manufacturing a contact lens, in particular to a method for producing a contact lens with a color image. Background technique [0002] Contact lenses are lenses worn on the cornea of ​​the eye to correct vision or protect the eyes. With the change of the times and the gradual maturity of technology, in addition to the function of correcting vision, users can modify the color of the eyes by wearing colored contact lenses, so that the eyes appear enlarged and the effect of modifying the color of the eyes is achieved. [0003] see figure 1 and figure 2 Shown, be the manufacture method for colored contact lens on the market at present, comprise the following steps: apply a coloring agent 10 on a metal template 11 with etching pattern 111 and form a pattern layer 12; Describe pattern layer 12 Pad printing onto the surface of a convex mold 13; injecting a lens material 14 into a concave mold 15; pressing the convex m...

AI Technical Summary

Problems solved by technology

[0004] Although the existing manufacturing methods for colored contact lenses can shorten the processing time for manufacturing colored contact lenses, the colored lens 16 can only present a single color after molding. color patterns, it is necessary to carry out a pad printing step for each color pattern, the more relative color patterns, the more required metal templates 11, and then increase the production cost, therefore, it is a kind of printing process for producers Huge burden

[0005] In addition, each pad printing step will gradually increase the image thickness of the colored lens 16. Therefore, the more complex the color pattern of the colored lens 16 is, the thicker the image thickness of the colored lens 16 will be. When the user wears the tinted glasses, the glasses will cause serious discomfort to the eyes because the image thickness of the tinted lens 16 is too thick, which will deteriorate the oxygen permeability of the tinted lens 16

[0006] Furthermore, currently, the etching pattern on the surface of the metal template 11 is etched using ferric chloride solution and nitric acid solution. During the etching process, nitrogen monoxide and nitrogen dioxide will be produced, and the oxidation Nitrogen and nitrogen dioxide not only cause serious pollution to the living environment, but also cause serious harm to the human body

However, after the metal template 11 has been etched, it needs to be developed with a chemical solvent mainly composed of hydrogen peroxide, and hydrogen peroxide also has a certain degree of damage to the skin of the human body, so it has already been banned in European countries.

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