What is an optical lens?

Optical lens: The glass originally used to make lenses is a pimple on ordinary window glass or wine bottle, which is similar in shape to "Crown", hence the name Crown Glass or Crown Brand Glass. At that time, the glass was extremely uneven and foamed. In addition to Crown glass, there is another kind of flint glass with more lead. ?

Optical glass is made of high-purity oxides such as silicon, boron, sodium, potassium, zinc, lead, magnesium, calcium and barium. Mixing according to a specific formula, melting in a platinum crucible at high temperature, uniformly stirring with ultrasonic waves, and removing bubbles; Then slowly cool for a long time to avoid the internal stress of the glass brick. The cooled glass block must be measured by optical instruments to check whether the purity, transparency, uniformity, refractive index and dispersion rate meet the specifications. The qualified glass block is heated and forged into an optical lens blank.

Extended data:

/kloc-around 0/790, the Frenchman Pierre Louis Junard discovered that mixing glass paste can make glass have uniform texture. Ernst Abbe and Otto Short of Zeiss founded Schott Glaswerke AG in Jena, Germany in 1884, and developed dozens of optical glasses in a few years, among which the invention of high refractive index barium crown glass is one of the important achievements of Schott Glaswerke AG.

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