High-temperature Glass Lens Molding Solution based on Glassy Carbon

[INQ. NO. 1911E08] eTOM’s mold manufactuing technology, based on bulk glassy carbon, facilitates precision glass molding of high melting-point glass materials such as borosilicate, fused silica, etc., which were dependent on grinding, etching and other manufacturing methods.
Thanks to the technology, it has become possible to save costs for producing various mid-infrared glass materials, which are increasingly used for infrared cameras, sensors for vehicles, home beauty laser applications, etc.
In general, when molding optical glass lenses, the layers that are known as Diamond-like Carbon(DLC), are placed onto the mold surface by utilizing vapor deposited carbon in order to prevent the glass from sticking onto the mold during the molding process at high temperatures.

The use of such carbon-coated layers is restricted at temperatures of over 600 degrees Celsius as they start to get cracks due to the difference of the coefficient of thermal expansion (CTE) between metal or ceramic-based mold materials and coated carbon layers.
However, the glassy carbon mold that is made of pure carbon materials itself can be stably used without cracks under inert gas atmosphere or vacuum conditions even at a temperature of over 600 degrees Celsius, as it does not require a separate carbon-coated layer.

korean-electronics.com | Blog Magazine of korean electronics, brands and Goods