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塑料透镜比玻璃透镜重量轻、成本低,但精度略低。日本理光公司已研究出一种新技术,使塑料透镜的精度大大提高。具体方法如下:将加热熔化的塑料树脂用高压注入热模具内,然后把注入孔堵住,使树脂慢慢降温凝固,由于树脂冷凝过程中未受到外力影响,因此其成形的形状和内部的均匀度都高度精确。采用这种技术制成的塑料透镜偏差仅为原来的1/4,而成本为同精度玻璃透镜的30%左右。这种透镜将首先用于办公自动化仪器的领域。
Plastic lenses are lighter, less expensive, but less precise than glass lenses. Ricoh Japan has developed a new technology that greatly improves the accuracy of plastic lenses. The specific method is as follows: the heated molten plastic resin is injected into the hot mold with a high pressure, and then the injection hole is blocked, so that the resin is slowly cooled and solidified. Since the resin is not subjected to external force during condensation, the formed shape and internal uniformity Degree are highly accurate. Plastic lenses made using this technology, the deviation is only the original 1/4, and the cost of the same precision glass lens about 30%. This lens will first be used in the field of office automation equipment.