Refractive index 2.0, low melting point optical glass comes out in Japan

by:Crylight     2021-05-01

   Japan's Sumita Optical Glass has recently developed an optical glass 'K-PSFn2' with a refractive index of up to 2.001, and has begun to provide samples. Mainly for mobile phone camera modules. Its characteristic is that it not only achieves the highest level of refractive index in the industry, but also has a lower molding temperature than products sold in the past. Not only can the life of the mold used for mold forming be extended, but also the production time can be shortened. In addition, the size of the refractive index depends on the heat treatment after the lens is formed.   The specifications other than the refractive index are as follows: the glass transition point (Glass Transition Point) is 478°C, and the glass softening point (Glass Yield Point) is 519°C. The Abbe number representing the difficulty of color difference is 20.7. The linear expansion coefficient (Linear Expansion Coefficient) is 92×10-7. The proportion reached 5.49. Does not contain arsenic (As) and lead (Pb). Although the specifications are not the final result, the possibility of substantial changes during mass production is very low.   Lens materials with a refractive index of 2.0, and Murata's ceramic material 'LUMICERA'. The lens forming technology using this material is said to have been successfully developed by Casio Computer and has reached a practical level. However, this material requires a higher cost grinding process in lens forming compared to mold forming.

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