There are many types of optical lenses and the difference between cleaning before and after coating

by:Crylight     2021-05-28

At present, my country’s optical lens industry is still dominated by the production of traditional optical glass. Some new materials need to be imported from abroad, which cannot fully meet the needs of my country’s high-tech development. In terms of optical lenses, my country urgently needs to conduct technical research and technology. Innovative work, that is, to develop new types of optical lenses, to study advanced manufacturing processes and testing technologies, and to form my country's industrialized scale production as soon as possible.

   generally refers to lanthanide optical glass, environmentally friendly optical glass, low melting point and phosphate optical glass, etc., which have emerged with the development of modern optics, optoelectronics and information technology Optical lenses used in optoelectronic digital products and information products with high technical content, difficult production, and superior optical optical lens performance generally refer to lanthanum series optical glass, environmental protection series optical glass, low melting point and phosphate optical glass, etc.

   Today’s world is in an era of rapid development of the optoelectronic information industry. At the same time, new materials such as lanthanide optical glass, environmentally friendly optical glass, low melting point and phosphate optical glass, etc. The advanced production technology contained in it has played a positive role in promoting the optimization and upgrading of China's optical lens industry, improving process technology and product quality, improving environmental quality, and catching up with the world's advanced level. It is of great significance to the development of China's optical lens industry. .

   At present, there are dozens of types of optical lenses: colorless optical glass lens design glass and colored optical glass, infrared optical lens, optical crystal, optical quartz glass, artificial Optical quartz crystals, glass-ceramics, optical plastics, optical fibers, aviation plexiglass, opal diffuse glass and related liquid materials, etc. Among them, optical glass is most used in imaging elements.

   The quality of plastic lenses can meet the quality requirements of glass lenses in many places. Especially in the glasses industry, there is a trend to replace them. However, due to its low refractive index and scattering High, non-uniformity and other restrictions on use, so its use range is not as wide as optical glass.

   K9 optical lens, K9 (H-K9L, N-laser lens BK7) is the most commonly used optical material, from visible to near infrared (350-2000nm) has excellent Transmittance is widely used in telescopes, lasers and other fields. H-K9L (N-BK7) is the most commonly used optical lens for preparing high-quality optical components. When the extra advantages of UV fused silica (good transmittance and low thermal expansion coefficient in the UV band) are not required, generally Will choose H-K9L.

   The cleaning of optical glass is divided into cleaning before coating and cleaning after coating. Optical glass cleaning agent before coating.

  1 High-power laser lens group, cleaning before coating of optical glass

   The primary pollutant of cleaning before coating is the core Oil (also called edging oil, core-seeking is also called core-setting and core-taking, which refers to the process selected in order to obtain a regular radius and core accuracy), fingerprints, dust, etc. Because the coating process has extremely strict requirements on the cleanliness of the lens, the selection of cleaning agents is very important. While thinking about the cleaning ability of a certain cleaning agent, we must also think about its corrosiveness and other questions.

  2, cleaning after optical glass coating

   usually includes cleaning before inking, cleaning before joining and cleaning before assembling, Among them, cleaning before bonding (bonding refers to the bonding of two lenses with photosensitive glue into a regular shape, and the mirror can meet the needs that cannot be processed at one time, or a process that produces a relatively special curvature and light transmittance) is the most demanding severe. The pollutants to be cleaned before joining are mainly a mixture of dust, fingerprints, etc. The cleaning is not difficult, but there are very high requirements for the cleanliness of the lens surface, and the cleaning method is the same as the previous two cleaning techniques.

  Because the contrast of the coating layer is simple, it is damaged by strong alkaline. After coating, strong alkaline cleaning agent cannot be used. A special cleaning agent for optical glass after coating is required. This cleaning agent is not The damaged film layer has strong detergency and can keep the film layer intact. Therefore, after optical glass coating, it is usually recommended to use professional optical glass cleaning agent after coating.

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