Optical glass refers to glass that can change the trans […]
Optical glass refers to glass that can change the transmission direction of light and can change the relative spectral dispersion of ultraviolet, visible or infrared light. Optical glass in the narrow sense refers to colorless optical glass; optical glassquartz glass products can be used to make lenses, prisms, mirrors and windows in optical instruments.
The difference between optical glass and other glasses is that as an integral part of the optical system, it needs to have optical imaging requirements. Therefore, the quality index of optical glass is quite strict. Compared with ordinary glass, optical glass will produce fringes, which will affect the quality of optical glass and the imaging accuracy. This is mainly due to uneven ingredients, corrosion of refractory materials in the furnace (mainly introduced Al), and agitation during the manufacture of glass products.
Therefore, in order to ensure the quality of optical glass, it is necessary to proceed from these aspects. The raw materials require purity>99%, impurities less than a few hundred thousandths, and the particle size and weighing of the raw materials have high requirements. In addition, the furnaces all use ceramic or platinum as refractory materials, and generally only use pouring, rolling, breaking, and liquid methods for molding, which effectively prevents the glass from being stirred during molding. In addition, the structure of the furnace is also different from that of daily glass furnaces. It is divided into melting tank (feeding), regulating tank (adjusting the melting atmosphere), refining tank (clarification), and homogenizing tank (stirring). The daily output of large furnaces is generally only Only 5 tons.