How do optical lens manufacturers make optical lenses? (5)
(3) Stained resin materials: optical lens manufacturers now use a technology that is soaked in the solution. Machine of the pigment of hot water, the commonly used dyes have red, green, yellow, blue, gray, and brown, according to the requirements can be arbitrary adjustable dye, the color depth can also control of the entire lens can be dyed into a kind of color, can also be dyed the color of the gradual change, such as upper lens dark, gradually slow down light, commonly known as the double color or color.
(4) photochromic resin material: first. Hypochromic resin lenses have been around since 1986, but not until 1990. It was only when sub-transI-tion lenses were marketed that they really began to gain popularity. Photochromic effect. The effect is obtained by adding a light-sensitive mixture into the material. Under the action of ultraviolet radiation at a special band, the structure of the light-sensitive material changes when the optical lens manufacturers uses it, which changes the absorption capacity of the material. These mixtures are combined in two main ways: they are mixed with liquid monomers before polymerization, or they are absorbed into the material after polymerization (the latter method is used for the Transition lenses). Photochromic resin lenses use several photochromic substances to give these different chromotropic effects in later manufacturing. Combined, this allows the lens to change color not only rapidly, but also endlessly. It's all temperature controlled.
(5) A new type of photochromic resin lens was released on the market in 1993. Thermoplastic materials (POLYCARBONATE, PC) such as PMMA were first developed in the 1950s. It was used in the manufacture of lenses, but it was soon replaced by CR-39 due to the shortcomings of easy deformation and poor wear resistance. Today, however, the development of polycarbonate has brought thermoplastic materials back into the lens field. In fact, polycarbonate is not a new material, it was discovered about 1995, optical lens manufacturers in the real field of optometry use only in recent years, after several years of development and many improvements, especially in the CD industry, its optical quality has been comparable with other lens materials. Polycarbonate is a thermoplastic polymer with linear amorphous structure, which has many optical advantages: excellent impact resistance (more than 10 times that of CR-39), high refractive index (ne=1.591,nd=1.586), non. Usually light (specific gravity = 1.20g/ cc), violet resistance. Outside line (385nm), high temperature resistance (softening point is 140 °C/280 °F). Polycarbonate materials can also be systematically coated. It has a lower Abbe number (Ve=31,Vd=30). In the aspect of dyeing, optical lens manufacturers because the polycarbonate material itself is not easy to color, so most of the color absorption through the dyeable anti-wear film.
