Selection of high-quality polarzied glass substrates. Do you know that the differences in the performance of polarized paint, lining and the bonding method of optical lenses cause great differences in the production processes of polarzied lenses, the degree of the optical effect realized and the physical performance of lenses. Currently, the major manufacturing methods of polarzied lenses include:
|Method of Production||Descriptions||Merits||Demerits
|Impact molding method||Increase the thickness of the polarized film from several percents of a millimeter to 0.7-1.5mm, which is then punched with molds into lenses of various bendings. ||Simple method, low cost||Owing to the limitations of materials and processes, there exist defects in surface flatness, bending stability, purity of materials and optical nature.
|Sandwich method||Hold polarized film between a plain lens and a correcting lens; use glue to bond the three into a polarized lens of optical grade.||It can correct ametropia, achieve stable optical performance, ensure evenness of lenses and greatly enhance purity. ||The lens is thick and easy to stratify; cannot be exposed to blazing sun for long, which will cause sudden change of temperature; is unsuitable for pored and suspender frames; has harsh requirements for the bending type and shape of frames.
|Film casting method||Hold the polarized film between a gelatineous plain lens and a gelatineous refractive lens; use a mold to press it into polarized lens; wait for the mixture to solidify before demolding and annealing. ||The features good durability, high production efficiency and low cost. ||Stability is influenced by changes in the gelatineous materials during production. It is hard to control luminosity in workshop processing, thus causing difficulty to secondary processing.
|Injection method||A polarized lens is not molded at one go. A mold is used first to shape the polarized film and refractive lens; wait for it to solidify before positioning; then, inject lense materials into the space between the polarizing film and the mold; wait for it to solidify to form a polarized lens. ||High production efficiency, low cost, good optical stability and satisfactory durability of lenses. ||This method can bend the polarized film directly for use, or increase its thickness before bending, or put liquid lens materials directly into production, or use gelatineous lens materials in production, or implement solidification at a high temperature or a relatively low temperature. The differences in these methods cause great differences in purity, performance stability of polarized film, imaging distortion degree of lenses, scratch-resistance and quality.
|Amalgamation method||This method requires the bendings of both the lens and the polarized film to be made in a very even and accurate way, tally with each other and be very thin. A special technology is used to fuse the polarized film into the front surface of the lens; then, apply liquid lens material to the front surface of the lens to form an even outer layer as a protective layer. ||The lens material is relatively even, pure and difficult to stratify, with stable optical performance, good durability, fitness for pored frames, small central thickness and high product quality.||High requirements and production costs.
Even if the same processing method is used, the rate of accepted products will be different for the manufacturers with different levels of operation.
Sunphey applies precise positioning and advanced technology to the secondary processing of polarzied lenses. The secondary processing of polarzied lenses for sunglasses is an important link. Polarzied lenses have positioning requirements for polarzied axis. Only after astigmia and astigmia axis are determined is it possible to start the secondary processing of polarzied lenses, which needs hardening and coating treatment. Polarzied film is sensitive to temperature. A temperature that is too high will cause creases in the polarzied film and changes to the performance of polarzation.
Quality coating and the technology for transparency enhancement and low reflection coating of quality lenses. The reflection of external light will form reflected images on the front and the back of polarzied lenses, which will affect the appearance and clarity of the mirror surface. The polarized lenses of Sunphey use unique coating technology to provide clear vision, ensure a beautiful effect and significantly reduce reflection. This can improve visual comfort in extreme light conditions, such as on high mountains or beaches, in the snow, a park, shopping or sports. A special coating makes this possible.
We have a professional team of optical technology to do what you have not thought of for you. Polarzied lens is a special lens for sunglasses and has gradually become a mainstream of the industry. However, the common standard of the sunglass industry does not involve the measurement of polarization characteristics. Many practitioners of the industry do not know much about the technical indicators for measuring polarzied lenses, thus causing the chaos of polarzied lens industry.