Japan produces low-melting optical glass with a refractive index of 2.0

by:Crylight     2021-04-30

   Sumita Optical Glass of Japan has developed an optical glass with a refractive index of up to 2.01 a few days ago, and has begun to provide samples, mainly for mobile phone camera modules. Its characteristic is that it not only achieves the industry's highest level of refractive index   , but also has a lower molding temperature than the products sold in the past. It not only extends the mold life used for mold molding, but also shortens the production time. Experts said that the size of the refractive index depends on the heat treatment after the lens is formed. The specifications other than the refractive index of this glass are as follows: the glass transition point (GlassTransitionPoint) is 478℃, the glass softening point (GlassYieldPoint) is 519℃, and the linear expansion coefficient (LinearExpansionPoint is 2×50%). , Does not contain arsenic (As) and lead (Pb). Although the specifications are not the final result, the possibility of substantial changes during delivery 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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