The Effect of Optical Lens Surface Roughness to Injection Conditions
| Autor: | Hsin-Wei Chen, 陳信瑋 |
|---|---|
| Rok vydání: | 2007 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 95 The plastic lens has light and advantage produced in a large amount, so the plastic optics lens is more and more important in the optical system. But plastic lens is having the form error that is shrinkage and scattering result from bad surface roughness after injecting. These will make effect quality of lens. As to surface roughness bed, the reflection of enter light separate to mirror reflection and scatter, however scatter will reduce luminous flux of image, decrease the contrast of the picture and resolution ratio of the optical system, so good surface roughness can reduce scatter and improve image quality of lens. Therefore, this study is by changing various injection conditions, such as melt temperature, mold temperature, packing pressure, packing time and injection speed. Then we use the Form Talysurf and white light interferometer to measure the surface roughness and to probe into injection conditions. Its result shows, use higher mold temperature, obviously improve the roughness of the lens surface, especially under mold temperature 90℃, reduce the roughness to Ra 9.5nm, close to Ra 8.5nm of the mold. So, by changing injection conditions can improve the roughness of lens, reduce the scatter, and get high image quality, it can be the base of injection of the lens. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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