TWI815401B - Process for manufacture of resin lenses - Google Patents

Abstract

The present invention relates to a process for manufacture of resin lenses, comprising steps of drying plural plastic particles, adding a blue ray absorber, a red toner, a blue toner and an orange toner into the dried plastic particle for further evenly stirring as a mixture, pouring the mixture into an injection molding machine to obtain a lens blank, cleansing, hardening and finally drying surfaces of the lens blank to obtain a final resin lens that can effectively block a large amount of blue and green rays as well as has a significantly increased contrast ratio of colors red and yellow.

Description

Preparation method of resin lenses (2)

The present invention relates to a method for preparing a resin lens, in particular to a method for preparing a resin lens in which the molded lens can block a large amount of blue light and green light and significantly improve the contrast of yellow and red.

Most ultraviolet light with wavelengths below 290nm will be blocked by the ozone layer, and most of ultraviolet light B (280~315nm) and ultraviolet light A (315~400nm) will also be blocked by crystal (light yellow), but There is still a very small amount of ultraviolet light A and B that will reach the retina and cause damage to the eyes, such as retinal pigment epithelial cell death and macular degeneration. In addition, although the crystalline lens can absorb part of the blue light in the visible light, there is still a large amount of blue light that will reach the retina. The retina, especially blue light with a wavelength of 415~445 in visible light, is the main cause of damage to the retina of the eye. It may cause the death of retinal pigment epithelial cells and macular degeneration.

The main purpose of the present invention is to provide a method for preparing a resin lens, which mainly adds blue light absorber, red toner, blue toner, and orange toner to PC plastic particles, the main component of the resin lens; so that the molded lens It can block blue light, green light and significantly improve the contrast of yellow and red.

The purpose and effect of the present invention are achieved by the following technology: a method for preparing resin lenses, which includes the following steps: Step 1: Dry PC plastic particles at 115°C for 2 hours; Step 2: Dry PC plastic particles Add blue light absorber, red toner, blue toner, orange toner, and stir them evenly to form injection molding raw materials; among them, the addition amount of each component is 0.055g of blue light absorber, 0.31g for every 10Kg of PC plastic particles. g of red toner, 0.03g of blue toner, and 0.118g of orange toner; Step 3: Add the injection molding raw materials to the injection molding machine to injection mold the preliminary lens embryo; Step 4: Clean the surface of the preliminary lens embryo: Step 5: The preliminary lens embryo that has completed the cleaning process undergoes surface hardening treatment; Step 6: The preliminary lens embryo after surface hardening treatment is further dried; Step 7: After the preliminary lens embryo is dried, it can block part of the blue light and green light, and make it A resin lens with significantly improved contrast between yellow and red; among them, the resin lens has a minimum transmittance of 31.63% for light in the 475nm~650nm band, and a transmittance of 0% for light in the 280nm~315nm band. 315nm~380nm band The light transmittance is 0%, and the average transmittance of light in the 380nm~500nm band is 20.78%.

The method for preparing a resin lens as described above, wherein the surface cleaning in step 4 is performed by using pure water plus detergent and pure water to alternately clean with ultrasonic vibration, and the temperature is set at 45~68°C.

The method for preparing a resin lens as described above, wherein the hardening treatment in step 5 involves leaching the primary embryo of the lens with a strengthening liquid. The liquid temperature of the strengthening liquid is controlled at 18~22°C for 1~3 minutes, and then Pre-drying, temperature 60~85℃.

The method for preparing a resin lens as described above, wherein the drying temperature in step 6 is 95~120°C.

The advantage of the present invention is that the resin lens of the present invention can uniformly mix the blue light absorber, red toner, blue toner, orange toner and PC plastic particles through the ratio of the above components and sufficient stirring. After the lens is formed, the average blocking rate of blue light and green light in the 380nm~500nm band is nearly 80%, achieving the purpose of anti-blue light and green light, so that the eyes are well protected; in addition, through red toner and blue toner , the addition of orange toner significantly improves the contrast between yellow and red in the finished molded resin lens.

Figure 1: Flow chart of the preparation method of the resin lens of the present invention

The second figure: the light transmittance curve of the resin lens of the present invention

The third figure: the color space chromaticity diagram of the resin lens of the present invention

In order to have a more complete and clear disclosure of the technical content, the purpose of the invention and the effects achieved by the present invention, they are described in detail below, and please refer to the disclosed drawings and figure numbers: Please refer to the first Figure is a flow chart of the preparation method of the resin lens of the present invention.

The preparation method of the resin lens of the present invention includes the following steps:

Step 1: Dry PC plastic particles at 115°C for 2 hours;

Step 2: Add blue light absorber, red toner, blue toner, and orange toner to the dried PC plastic particles, and stir them evenly to form injection molding raw materials; the amount of each component added is per 10Kg of PC plastic particles. Add 0.055g of blue light absorber, 0.31g of red toner, 0.03g of blue toner, and 0.118g of orange toner.

Step 3: Add the injection molding raw materials to the injection molding machine to injection mold the preliminary lens embryo;

Step 4: Clean the surface of the lens embryo;

Step 5: Surface harden the lens embryo that has completed the cleaning process;

Step 6: The surface-hardened lens embryo is further dried;

Step 7: After drying the preliminary lens embryo, a resin lens can be obtained that can block part of the blue light and green light, and significantly improve the contrast of yellow and red (see the third picture); among them, the resin lens has a good response to the wavelength of 475nm~650nm. The minimum transmittance of light is 31.63%, the transmittance of light in the 280nm~315nm band is 0%, the transmittance of light in the 315nm~380nm band is 0%, and the transmittance of light in the 380nm~500nm band is 0%. The average light transmittance is 20.78% (see the second picture).

Among them, in a preferred embodiment of the preparation method of the resin lens of the present invention, the surface cleaning method of the lens embryo in step 4 is: adding pure water with detergent and pure water, and then cleaning it alternately with ultrasonic vibration. , pure water plus detergent, the temperature of pure water is set at 45~68℃.

Among them, in a preferred embodiment of the preparation method of the resin lens of the present invention, the technique for surface hardening the lens preliminary embryo in step 5 is: leaching the lens preliminary embryo with a strengthening liquid, and controlling the liquid temperature of the strengthening liquid at 18~22℃, the time is 1~3 minutes, and then pre-dried at the temperature of 60~85℃.

Among them, in a preferred embodiment of the resin lens preparation method of the present invention, the drying temperature in step 6 is: 95~120°C.

Table 1 below shows the light transmittance in each wavelength band of the resin lenses produced by the preparation method of the present invention. In addition, the second figure shows the light transmittance curve of the resin lens produced by the preparation method of the present invention, and the third figure reveals the color space chromaticity of the resin lens produced by the preparation method of the present invention. Figure.

<Table 1>

It can be seen from Table 1 and the second and third figures that the resin lens of the present invention has a minimum transmittance of 31.63% for light in the 475nm~650nm band, and 0% for light in the 280nm~315nm band. The transmittance of light in the 315nm~380nm band is 0%, and the average transmittance of light in the 380nm~500nm band is 20.78%. It has excellent performance in blocking green light and blue light, and the average blocking rate is close to 80 % (see the second picture), while significantly improving the contrast of yellow and red (see the third picture).

The above examples are only some of the embodiments of the present invention and are not intended to limit the present invention. Any slight changes and modifications based on the creative spirit and characteristics of the present invention should also be included in the scope of this patent.

To sum up, the embodiments of the present invention can indeed achieve the expected effects, and the specific technical means disclosed have not only not been seen in similar products, but have also not been disclosed before the application, and they are fully in compliance with the patent law. According to the regulations and requirements, if you submit an application for an invention patent in accordance with the law, it will be very convenient for you to be reviewed and granted a patent.

Claims (4)

A method for preparing resin lenses, which includes the following steps: Step 1: Dry PC plastic particles at 115°C for 2 hours; Step 2: Add blue light absorber, red toner, and blue toner to the dried PC plastic particles. , orange toner, and stir it evenly to form an injection molding raw material; wherein, the addition amount of each component is 0.055g of the blue light absorber, 0.31g of the red toner, 0.03 g of the blue toner and 0.118g of the orange toner. Step 3: Add the injection molding raw materials to the injection molding machine to injection mold the lens embryo; Step 4: Clean the surface of the lens embryo; Step 5: Surface harden the lens embryo that has completed the cleaning process; Step 6: After surface hardening The preliminary lens embryo is further dried; Step 7: After the preliminary lens embryo is dried, a resin lens can be obtained that can block part of the blue light and green light, and significantly improve the contrast of yellow and red; among them, the resin lens is sensitive to 380nm~500nm The average rejection rate of blue light and green light in the wavelength band is close to 80%. The method for preparing a resin lens as described in claim 1, wherein the surface cleaning in step 4 is performed by using pure water plus detergent and pure water to alternately clean with ultrasonic vibration, and the temperature is set at 45~68°C. The method for preparing a resin lens as described in claim 1 or 2, wherein the hardening treatment in step 5 involves leaching the primary embryo of the lens with a strengthening liquid, the liquid temperature of the strengthening liquid is controlled at 18~22°C, and the time is 1~ 3 minutes, then pre-dry at a temperature of 60~85°C. The method for preparing a resin lens according to claim 3, wherein the drying temperature in step 6 is 95~120°C.

Images