Invention Grant
US06309568B1 Process method optical thermoplastic urethane resin lens and the lens
失效
光学热塑性聚氨酯树脂透镜和透镜的工艺方法
- Patent Title: Process method optical thermoplastic urethane resin lens and the lens
- Patent Title (中): 光学热塑性聚氨酯树脂透镜和透镜的工艺方法
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Application No.: US09402756Application Date: 1999-10-27
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Publication No.: US06309568B1Publication Date: 2001-10-30
- Inventor: Zhou Yang , Zhenya Zhu , Yin-Nian Lin , Tadashi Kobayashi , Yuyoshi Saito
- Applicant: Zhou Yang , Zhenya Zhu , Yin-Nian Lin , Tadashi Kobayashi , Yuyoshi Saito
- Priority: JP9-103483 19970421
- Main IPC: B29D1100
- IPC: B29D1100
Abstract:
A method of continuously fabricating a lens excellent in various optical characteristics and having no nonuniformity in the characteristics over a total of the lens and a lens fabricated by the method. A first step for forming thiourethane prepolymer and a second step for making thiourethane prepolymer react with at least one urethane forming monomer are carried out in an extruder or in a reactor having an extruding device at a succeeding step, extruded thermoplastic thiourethane-urethane copolymer for optical use is elongated in a sheet-like shape, a lens precursor is formed by punching out the copolymer elongated in a sheet-like shape and the lens precursor is pressed such that a predetermined curved face is provided at least on one face of the lens precursor.
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