Investigation on Formation Mechanism of Molding Glass Using On-Line Observation of Temperature Gradient

• Main Authors: Bo-Ching Wu, 吳柏慶
• Other Authors: Jeng-Ywan Jeng
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/01508850253080048951

碩士 === 國立臺灣科技大學 === 機械工程系 === 98 === Aspheric lens is one of the most important components of camera and of camera phone, now it is in high demand and pursues higher image quality each year. Therefore supplier can not provide enough aspherical lenses by traditional glass molding technology. The molding glass technology has advantage in high resolution, high stability and mass production, and so on. Presently, supplier in Taiwan all has ability to provide mass production of aspheric lenses, but they do not realize further variations of preform during processing of glass molding. Cause Researchers analyze lens defects by results. Hence, this research observes glass molding process from preform to lens by observation system. There are different variations of preform by temperature gradient, surface energy, glass property, heat transfer, and so on. Multi-heating method combines the infrared heater to maintain environment temperature with the hot air generator that was employed to heat the preform directly in this research. The method not only improves unbalance flow but also resists Devitrification, surface defects and bubbles in lens, and thus the formability and optical character of lens are not affected by multi-heating method, and also decrease mold temperature and heating time, and increase the life of mold and coating. Temperature difference between the mold and preform, which formability, was further discussed in this research.