What material is used for the optical lens? A lens is an optical element made of a transparent material whose surface is a part of a spherical surface. The lens is composed of several lenses, which are the plastic and glass lenses currently used by Runzhihui Lens. ) Two types, glass lenses are more expensive than plastic. Generally, the lens structures used for cameras are: 1P, 2P, 1G1P, 1G2P, 2G2P, 4G, etc. The more lenses, the higher the cost. Good-quality products generally use glass lenses, and their imaging effects are better than plastic lenses. Let's talk about optical lenses below.

Optical glass has high transparency, purity, colorlessness, uniform texture, and good refractive power, so it is the main raw material for lens production. Due to the difference in chemical composition and refractive index, optical glass has:

1. Flint glass-lead oxide is added to the glass composition to increase the refractive index (1.8804).

3. Lanthanum crown glass-as the species discovered, it has the excellent characteristics of high refractive index and low dispersion rate, which provides conditions for the creation of large-aperture advanced lenses.

Plastic lens usually refers to a lens molded with a transparent plastic material PMMA (commonly known as acrylic), but also a transparent PC material. Disadvantages of plastic and glass comparison:

1. Poor temperature characteristics: Compared with glass, plastics are susceptible to environmental influences on optical characteristics. Because once the heat-resistant temperature is low and the thermal expansion coefficient is large, the optical components will be deformed and affect the optical characteristics. The accuracy is lower than that of glass: plastic has high unevenness due to the material characteristics, and is prone to shrinkage and deformation, which makes the accuracy difficult to control.

2. Poor scratch resistance: The mechanical strength of plastic is low, and the hardness of the material is not as hard as glass, so the scratch resistance is poor.

3. Compared with optical glass, there are fewer types of materials: since the development of optical glass has been for a long time, plastic lenses have fewer types of materials and lower refractive index, about 1.5 to 1.6. Among them, the distribution is narrower.

5. The size is limited: the accuracy of plastic lens injection molding above ∮100mm is insufficient, and there will be molding problems. It can also be said that the larger the size, the more difficult it is to control the accuracy.

Compared with glass, plastic lenses have many disadvantages, but they need to be targeted at certain industries. Plastic materials are low in price and large in output. For specific functions and advantages, please consult Runzhihui Optical Lens Customer Service.