Lens, the lens is also called the center of the lens, which is the center of the drawing after being mounted, and is suitable for being clamped in the frame of the lens, so it is called the center of the lens. Its form can be horizontal or vertical, and it is a simple and convenient installation style.
Lens: A piece of glass or other transparent materials with one or more curved surfaces, through which things can be observed to make things appear clear, larger or smaller.
According to different materials, lenses can be divided into the following four types:
Resin lens, special lens, space lens, glass lens, main classification, glass lens
Glass lenses are more scratch-resistant than lenses of other materials, but their weight is relatively heavy, and their refractive index is relatively high: ordinary lenses are 1.523, ultra-thin lenses are: 1.72 or more, up to 2.0.
The main raw material of glass lenses is optical glass. Its refractive index is higher than that of resin lenses, so under the same power, glass lenses are thinner than resin lenses. The light transmittance and mechanochemical properties of glass lenses are relatively good, with constant refractive index and stable physical and chemical properties. The colorless lens is called the optical white support (white film), and the pink film in the colored film is called the Croxel lens (red film). Croxel lenses can absorb ultraviolet light and have a slight absorption effect on strong light.
The glass sheet has superior 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 is fragile and the material is heavy. Resin lenses
Resin is a kind of hydrocarbon (hydrocarbon) secretions from a variety of essences, especially coniferous essences. Because F has a special chemical structure and can be used as a latex paint and glue, it was rebuilt. It is a mixture of multiple polymer compounds, so it has different melting points. Resins can be divided into two types: natural resins and synthetic resins. There are many types 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, resin glasses, coatings, etc. Resin lens is a lens that is chemically processed and polished with resin as the raw material.