Study on an Ultra-precisely Joining Method for Optical Lenses using a Shrink Fitter

光学透镜热缩机超精密连接方法的研究

• 批准号: 12650138
• 负责人: NITTA Isami
• 金额: $ 2.24万
• 依托单位: NIIGATA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650138/
• 关键词: Machine Element; Fixing Element; Shrink Fitter; Optical Lens; Ultra Precision Joining; Laser Spot Size; Form Error; Scanner; レーザー

Optimum Shapes and dimensions of the shrink fitter were obtained using finite element method last year. In the analysis, the physical properties of catalog data for every type of the lens were used. POM was used as the shrink fitter material. In addition, the numerical simulation technique which could consider form error of fitting surfaces of lenses and the housing was developed. It is required that the dimensional accuracy of fitting surface is high, because the shrink fitter method is a shrinkage fit. As a result, the form error of fitting surface is little. Therefore, in the numerical simulation, there was almost no effect of the form error on the contact pressure distribution.The creep tests of polymer materials for shrink fitter, which were started last year, were continued under three kinds of temperature conditions. Four different polymer materials were used. It became that the creep displacement was constant after 500 hours, and further creep displacement was hardly observed.Simpler method of joining the optical lenses was also examined in this fiscal year. The high dimensional accuracy is required in the shrinkage fit. Therefore, the processing cost of the shrink fitter and the housing increases. The processing cost becomes low, if the dimensional tolerance necessary for fitting surfaces can be increased. Then, the periphery of the shrink fitter was turned so that the contact area of fitting surface of the shrink fitter may decrease. As the second method, the housing was cut in one direction, and tightened by the band, after the optical lens and the shrink fitter were inserted in the housing. Those two methods could loosen the dimensional tolerance of the shrink fitter. In addition, it was confirmed that dimensional tolerance of the shrink fitter could be also loosened by positively introducing the form error to the shrink fitter in the numerical simulation.

去年用有限元法得到了收缩滤器的最佳形状和尺寸。在分析中，使用了每种类型透镜的目录数据的物理性质。采用聚甲醛作为收缩滤料。此外，还发展了考虑透镜与壳体拟合面形状误差的数值模拟技术。由于收缩钳制法是一种收缩配合，因此对拟合面尺寸精度要求较高。因此，拟合曲面的形状误差很小。因此，在数值模拟中，形状误差对接触压力分布几乎没有影响。去年开始的收缩滤网用高分子材料蠕变试验在三种温度条件下继续进行。使用了四种不同的高分子材料。500 h后，蠕变位移趋于恒定，几乎没有进一步的蠕变位移。本财政年度还研究了连接光学镜片的更简单方法。缩孔配合要求尺寸精度高。因此，收缩过滤器和外壳的加工成本增加。如果可以增加拟合表面所需的尺寸公差，加工成本就会降低。然后，转动收缩滤器的外围，使收缩滤器的拟合面接触面积减小。第二种方法是将光学透镜和收缩过滤器插入外壳后，沿一个方向切割外壳，并用带拧紧。这两种方法都可以使收缩滤器的尺寸公差变松。此外，数值模拟还证实了在收缩滤器中引入形状误差也可以使收缩滤器的尺寸公差松动。