Introduction of resin lens

Resin lens is currently the most common lens. For example, the most popular acetate eyewear at present use CR-39 resin lenses for sunglasses, while metal glasses and titanium eyewear often use CR-39 resin lenses besides nylon lenses. This article mainly introduces the resin lens.What is resin lens? Resin is a hydrocarbon secretion from many plants, especially conifers. It is valued because of its special chemical structure and can be used as latex paint and rubber. It is a mixture of a variety of polymer compounds, so there are different melting points. Resin can be divided into two types: natural resin and synthetic resin. There are many types of resin, which are widely used in light industries and heavy industries. You can often see in daily life. Such as plastic, paint, etc. Resin lens is a kind of lens chemically processed and polished with resin as raw material.What are the advantages of resin lenses?1. Light. The general resin lens is 0.83g/cm³-1.5g/cm³, and the glasses lens is 2.27g/cm³ ~ 5.95g/cm³.2. Strong impact resistance. The resistance of resin lenses is generally 8-10kg/cm2,Its impact resistance is several times that of glass, so it is not easy to break, safe and durable.3. Good light transmission. In the visible light area, the transmittance of the resin lens is similar to that of the glass. In the infrared light area, it is slightly higher than that of the glass. In the ultraviolet area, the transmittance decreases with the decrease of the wavelength starting at 0.4 um, and the light with the wavelength less than 0.3 um is almost absorbed.4. Low cost. Injecting and molding lenses only need to make a precise mold, which can be produced in large quantities, saving processing costs and time.5. Can meet special needs. It is not difficult to make non-spherical lenses with resin, while glass lenses are difficult to do.Why did the resin lens gradually replace the glass lens?1. The surface luster and smoothness of the resin lens are good. As long as the mold is precise, it can even reach the level of glass lenses.2. The dispersion of resin lens is very similar to that of ordinary glass lens.3. The perspective rate of resin lenses is 92%, which is very close to the level of glass lenses.4. The surface reflection of the resin lens is lower than that of ordinary glass lenses, and it is not dazzling. This is due to its high light transmission rate and low refractive index.5. The optical properties of resin lenses are extremely stable. No change in high temperature or low temperature.How is resin lens produced?The resin lens must be processed by strict 12 processes. Material preparation → mold assembly and pouring →First solidification and forming → opening mold → lens cutting edge → lens cleaning → secondary solidification → base lens test → lens hardness → tested after hardened → lens coating → coating layer test. Finally, the packaging. The packaged lens is the resin lens we see.What is the refractive index?The ratio of the sine of the incident angle to the sine of the refraction angle when light is refracted from a vacuum into a medium. Its value is generally between 1.49-1.74. Under the same degree, the higher the refractive index, the thinner the lens. So it is very suitable for making myopia lenses. If anyone who has used glass myopia lenses knows that the previous glasses are very heavy, and the current myopia eyewear can be made very light. The biggest difference is that most of the resin lenses are used now.

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