Optical glass lens molding technology

Optical glass lens molding technology is a high-precision optical element processing technology. It puts the softened glass into a high-precision mold, and under the condition of heating, pressure and oxygen-free, it can be directly molded at one time to achieve use. Required optical parts. This technology has been successfully developed in the mid-1980s and has a history of more than ten years. It has now become one of the most advanced optical parts manufacturing technology methods in the world, and has entered the production and practical stage in many countries. The popularization and application of this technology is a major revolution in the processing of optical glass parts in the optical industry. Since this technology can directly press and form precise aspheric optical parts, it has since created an era in which aspheric glass optical parts can be widely used in optical instruments. Therefore, it also brings new changes and developments to the optical system design of optoelectronic instruments, which not only reduces the size of optical instruments, reduces weight, saves materials, reduces the workload of optical parts coating and workpiece assembly, and reduces costs. , But also improved the performance of optical instruments and improved the quality of optical imaging.

The optical glass molding method for manufacturing optical parts has the following advantages: ① It does not require the traditional rough grinding, fine grinding, polishing, edging centering and other processes, so that the parts can achieve higher dimensional accuracy, surface accuracy and surface roughness. ②It can save a lot of production equipment, tooling accessories, workshop area and skilled technical workers, so that a small workshop can have high productivity; ③It can easily and economically realize the mass production of precision aspheric optical parts; Precisely controlling the process parameters such as temperature and pressure in the molding process can ensure the dimensional accuracy and repeatability of the molded optical parts; ⑤ Small aspheric lens array can be molded; ⑥ Optical parts and installation reference parts can be made into a whole .

At present, mass-produced molded aspheric optical parts have a diameter of 2-50mm, with a diameter tolerance of ±0.01mm; a thickness of 0.4-25mm, with a thickness tolerance of ±0.01mm; a radius of curvature of up to 5mm; and a surface accuracy of 1.5λ, The surface roughness meets the US military standard of 80-50; the refractive index can be controlled to ±5×10-4mm, and the refraction uniformity can be controlled to <5×10-6mm; the birefringence is less than 0.01λ/cm.

Now, well-known companies and manufacturers that have mastered this advanced glass optical component manufacturing technology in the world include Kodak and Corning in the United States, Ohara, Hoya, Olympus, and Panasonic in Japan, Zeiss in Germany, and Philly in the Netherlands. Pu company and so on.

　　Glass optical parts molding technology is a comprehensive technology that requires the design of a dedicated molding machine, the use of high-quality molds and the selection of reasonable process parameters. The molding method, glass types and blanks, mold materials and mold making are all key technologies in glass molding.