According to different materials, lenses can be divided into the following four types:
Resin lenses, special lenses, space lenses and glass lenses.
Main classification
Glass lens
Glass lenses are more scratch-resistant than lenses made of other materials, but they are heavier and have higher refractive index: ordinary lenses 1.523, ultra-thin lenses 1.72 or more, and the highest can reach 2.0.
The main raw material of glass lens is optical glass. Its refractive index is higher than that of resin lens, so glass lens is thinner than resin lens at the same degree. Glass lens has good light transmittance and mechanical and chemical properties, constant refractive index and stable physical and chemical properties. A lens without color is called an optical white disk (white disk), and a pink disk in a colored disk is called a Croce lens (red disk). Croxair lenses can absorb ultraviolet rays and slightly absorb strong light.
The glass plate has excellent optical properties, is not easy to scratch, and has a high refractive index. The higher the refractive index, the thinner the lens. However, the glass plate is fragile and the material is biased.
Resin lens
Resin is a kind of hydrocarbon secretion from many plants, especially conifers. Because of its special chemical structure, it can also be used as latex paint and adhesive, so it is paid attention to. It is a mixture of various polymer compounds, so it has different melting points. Resin can be divided into natural resin and synthetic resin. There are many kinds of resins, which are widely used in people's light industry and heavy industry, and can often be seen in daily life, such as plastics, plexiglass, paint and so on. Resin lens is a lens made of resin through chemical processing, synthesis and polishing.
Question 2: What's the difference between lenses made of different materials? According to the different materials, it can be divided into the following four types: resin lenses, special lenses, space lenses and glass lenses.
1, glass lens
Glass lenses are more scratch-resistant than lenses made of other materials, but they are heavier and have higher refractive index: ordinary lenses 1.523, ultra-thin lenses 1.72 or more, and the highest can reach 2.0.
The main raw material of glass lens is optical glass. Its refractive index is higher than that of resin lens, so glass lens is thinner than resin lens at the same degree. Glass lens has good light transmittance and mechanical and chemical properties, constant refractive index and stable physical and chemical properties. A lens without color is called an optical white disk (white disk), and a pink disk in a colored disk is called a Croce lens (red disk). Croxair lenses can absorb ultraviolet rays and slightly absorb strong light.
The glass plate has excellent optical properties, is not easy to scratch, and has a high refractive index. The higher the refractive index, the thinner the lens. However, the glass plate is fragile and the material is biased.
2. Resin lenses
Resin is a kind of hydrocarbon secretion from many plants, especially conifers. Because of its special chemical structure, it can also be used as latex paint and adhesive, so it is paid attention to. It is a mixture of various polymer compounds, so it has different melting points. Resin can be divided into natural resin and synthetic resin. There are many kinds of resins, which are widely used in people's light industry and heavy industry, and can often be seen in daily life, such as plastics, plexiglass, paint and so on. Resin lens is a lens made of resin through chemical processing, synthesis and polishing.
Advantages of resin lens
Resin lenses are optical lenses made of resin. There are many kinds of materials, and compared with glass lenses, it has its unique advantages:
1, light. Generally, the resin lens is 0.83- 1.5 and the optical glass is 2.27-5.95.
2. Strong impact resistance. The impact resistance of resin lens is generally 8 ~ 10 kg/cm2, which is several times that of glass, and it is not easy to break, safe and durable.
3. Good light transmission. In the visible region, the transmittance of resin lens is similar to that of glass; Infrared region, slightly higher than glass; In the ultraviolet region, the transmittance decreases with the decrease of wavelength from 0.4um, and the light with wavelength less than 0.3um is almost completely absorbed.
4. Low cost. Injection molded lenses can be mass-produced only by manufacturing a precise mold, which saves processing cost and time.
5, can meet special needs. For example, aspherical lenses are not difficult to make, and glass lenses are difficult to make.
Resin lens defect
Disadvantages are: the surface wear resistance and chemical resistance are worse than glass, the surface is easy to scratch, and the water absorption is greater than glass. These shortcomings can be improved by coating. Fatal disadvantages are high thermal expansion coefficient, poor thermal conductivity, low softening temperature and easy deformation, which affects optical properties.
3. Space movies
Space lens (PC lens) is the most resistant lens in the world at present, and its resistance is 10 times that of ordinary resin lens and 60 times that of glass lens. It is extremely tough, even used in bulletproof glass, and it is also the lightest material used in lenses at present.
Disadvantages: extremely low Abbe number and poor visual quality; The surface hardness is very small and it is not wear-resistant.
4. Special lens
1907 Owen Aves put forward the concept of progressive multifocal lens for the first time, which marked the birth of a new concept of special lens vision correction.
The design of this special lens is inspired by the shape of the elephant's nose. People make the curvature of the front surface of the lens increase from top to bottom, which can make its refractive power change accordingly, that is, from the far area above the lens, the refractive power gradually increases continuously until the near area at the bottom of the lens reaches the required near refractive power.
Whether it is glass lens or resin lens, plus multi-layer coating treatment will make glasses feel more comfortable to wear. The principle is to coat the lens surface with coating substances with different refractive indexes, such as magnesium fluoride or timely, so that the reflection residual light interferes with each other, which can reduce the reflection. In addition, the refractive index of the lens can reach more than 1.604, which is brighter and clearer than that of the general material 1.525.
Question 3: What is the material of resin lens? Plexiglass (acrylic acid, PMMA, polymethyl methacrylate CR-39 (polypropylene-based diethylene glycol carbonate) PC board (polyvinyl carbonate) PS (styrene)
Question 4: What is the material of sunglasses lenses? 1, plastic lens
Uv400 resin lens
This is a material that many sunglasses brands like to use. Lightweight and unbreakable is its most obvious feature. The anti-ultraviolet function of plastic lens without any treatment is obviously better than that of glass lens, and the color treatment of plastic lens is simpler. The disadvantages of plastic lenses are poor wear resistance, easy to scratch, easy to deform when the lens is hit, so care should be taken.
At present, there are mainly three kinds of plastic lenses, namely resin lenses, PC lenses and acrylic lenses.
2. Glass lens
Glass lens
We often come into contact with glass lenses. The most outstanding advantage of glass lens is that its optical performance is very stable, which is the consistent advantage of glass lens, and it is also true for frame glasses. In addition, glass lenses are not easily deformed and will not be affected by the pressure of the frame. The disadvantage of glass lens is that it is easy to break and hurt the eyes. At present, the newly developed reinforced glass lens is much more outstanding than ordinary glass lens, and it can be regarded as a kind of safety lens.
3. Polarizing lens
Polarizing lens
This is a lens for polarized sunglasses, which uses the polarization principle of light to block glare from all directions outside the lens, making the line of sight clearer and safer when driving.
4. Color-changing lenses
Decolorization lens
Compared with the photosensitive lens, the color of the lens will change correspondingly because of the change of light, so that the eyes can adapt to different environments. Under strong light, the color of the color-changing lens will deepen, and when pressed, the color of the lens will automatically become lighter. This kind of lens has been applied to myopia sunglasses, and this kind of color-changing lens is also considered as the most convenient and beautiful myopia sunglasses, which is more popular than clip-on sunglasses.
Question 5: What is the material of the lens? Glass, resin and pc are commonly used lens materials. Glass has the best wear resistance, but it is heavy and fragile, while resin is light and unbreakable, with good light transmittance and stronger anti-ultraviolet ability. Pc is a bit expensive, not fragile, but not wear-resistant. The latter two kinds of wear resistance mainly depend on the coating level of manufacturers, and generally only those of large manufacturers are more durable. In addition, there are many online, indicating that there are also kinds on the mirror.
Question 6: How to tell what material glasses lenses are made of? At present, resin is light and glass is heavy, which is the simplest.
Question 7: What is the material of Ray-Ban's glasses? The material of Ray-Ban sunglasses is roughly as follows:
1, AC lens: the lowest cost, the material is brittle, there may be brittle chips when broken, and the optical index stability is average;
2. PC lens: The cost is a little higher than AC, and it is a kind of safety lens called "bulletproof glass". In fact, there is no chip cracking, and the optical index stability is also average;
3.CR39 lens: the cost is higher than the first two, the optical index is stable and the definition is good;
4, glass lens: high definition, excellent optical index, strong wear resistance, heavy weight, easy to crack;
5. Nylon lens: the clarity is second only to glass lens, and other optical indicators are the best.
Brand glasses can be divided into two categories. One is professional sunglasses brands, such as Ray-Ban and oakley. The lenses of these products have some patents or special processes or designs at least when they were first founded. The overall design of glasses is also unique and comfortable, and the lens materials are constantly optimized with the continuous upgrading of technology. The other is the derivative brands of well-known brands, mainly clothing, jewelry and automobile brands. They may pay more attention to styling design, but the material of lenses is not as good as color.
The reasons for the high price are, on the one hand, brand value (or authorized commission) and, on the other hand, long channels, in which all links share risks and benefits.
The quality of the so-called A-goods imitations on the market really varies greatly, which is not what Taobao stores claim. (Respect originality, this answer is taken from Zhang Weizhong)
Question 8: What is the material of glasses lens? It used to be glass, but now it is mostly resin.
Satisfied, please adopt.