Investigations into the production of achromatic lenses by two-component injection compression molding of transparent plastics

透明塑料二组分注射压缩成型生产消色差透镜的研究

• 批准号: 432469470
• 负责人: Professor Dr.-Ing. Dietmar Drummer
• 金额: --
• 依托单位: Lehrstuhl für Kunststofftechnik (LKT)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/432469470?language=en
• 关键词: Investigations; into; production; achromatic; lenses

Compared to many optical grades of glass, plastics have a high dispersion. This means that the refractive index of the material decreases more strongly with increasing wavelength. As a result, different wavelengths of light (light colors), which are focused by an optical lens, have different focal positions. This leads to image errors and blurred images, which is why imaging optics are usually composed of several combined lenses. In illumination optics, the dispersion is shown by a color veil on the edge of the light cone.By combining two lenses made of materials with different dispersions to form an achromatic lens, this chromatic aberration, can be reduced, resulting in a significant increase in imaging performance. To improve image quality, plastic lens systems are usually assembled from several lenses. This requires the production of several components, exact positioning and further assembly steps.The project therefore focuses on injecting a second component onto a preform with low warpage and shrinkage to produce an achromatic lens from different transparent plastics. Possible plastics for the combination are polycarbonate (PC) and poly(methyl methacrylate) (PMMA). In addition to reducing further processing and assembly steps, two-component injection molding also increases transmission by reducing reflections at the interfaces.From the application of an achromatic lens, the general derivation of a production strategy for low-shrinkage and low-warpage two-component injection compression molding with large contact surfaces is to be carried out in the research project. In addition to optics, this knowledge is relevant for numerous other applications. Nevertheless, the prerequisites for this two-component injection moulding of optical components are particularly challenging. The second component must be injected onto the preform with very little shrinkage, the injection process of the second component should not deform the first component surface and sufficient adhesion of the two plastics over a large surface must be ensured. These points are to be achieved by an adapted injection compression molding process. An adapted compression of the melt in the process by means of embossing should reduce subsequent shrinkage of the injected component as far as possible. The influences of the process parameters on adhesion, shrinkage, the shape of the interface and the refractive index as well as the component properties are systematically investigated.

与许多光学等级的玻璃相比，塑料具有很高的分散体。这意味着材料的折射率随着波长的增加而降低。结果，由光学镜头聚焦的不同波长（浅色）具有不同的焦点位置。这会导致图像错误和模糊图像，这就是为什么成像光学通常由几个组合透镜组成的原因。在照明光学元件中，通过在光锥边缘的颜色面纱显示色散。通过将两种由不同的材料与不同的分散体组合在一起形成可观的晶状体，可以降低这种色差，从而显着增加成像性能。为了提高图像质量，塑料透镜系统通常是从多个镜头组装的。因此，这需要生产几个组件，确切的定位和进一步的组装步骤。因此，该项目着重于将第二个成分注入低经过扭曲和收缩的预形成，以产生来自不同透明塑料的肉眼镜头。组合的可能塑料是聚碳酸酯（PC）和聚甲基丙烯酸甲酯（PMMA）。除了减少进一步的处理和装配步骤外，两组分组的成型还通过减少接口处的反射来增加传播。从应用型晶状体的应用，生产策略的一般推导是在研究项目中使用大型损伤和低破坏两种组件的两组分两种损害压缩模制的一般性造成策略。除了光学外，此知识与许多其他应用程序有关。然而，这种两种组件的光学组件的注射成型的先决条件特别具有挑战性。必须将第二个成分注入预成型，而很少收缩，第二个成分的注入过程不应变形第一个组件表面，并且必须确保两种塑料的足够粘附在大表面上。这些点可以通过改编的注入压缩成型过程来实现。通过压花的过程，在过程中对熔体进行了适应的压缩，应尽可能尽可能地减少注入的成分的收缩。过程参数对粘附，收缩，界面的形状和折射率以及组件特性的影响。