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2007亚洲显示国际会议

作者： Han-Chung Hsu Hsiao-Fang Lin Lea-Ming Lu James T.Wang Institute of Opto-Mechatronics Engineering National Central University.Jhongli TaiwanChina Department of Mechanical Engineering National Central University.Jhongli TaiwanChina Pou Yuen Technology 3C Product Pou Chen GroupChang HwaTaiwanChina

The optical design of optical prism with aspheric lens for fingerprint identification is researched.We propose a new structure for optical prism of fingerprint identification,which has an asymmetrical aspheric lens on the output plane.It is numerically shown under point approximate model that the optical properties of such prism are better than one of optical prism with aspheric lens.When the fingerprint range is 16(2)mm,the results show that the image contrast of our proposed prism is above 0.5 and the minimum image contrast for optical prism with aspheric lens is only 0.2.

关键词： aspheric lens Fingerprint Identification Asymmetrical aspheric lens Point Approximate Model Image Contrast

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Study on Injection Moulding of High Precision aspheric Plastic lens

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厦门大学学报（自然科学版） 2002年第S1期41卷 132-页

作者： TO Suet LEE Wing-bun Advanced Manufacturing Technology Research Centre Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityAdvanced Manufacturing Technology Research Centre Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic University Hong Kong ChinaHong Kong China

With the rapid development of information and multi me dia technologies, the demand for the optical plastic aspheric elements used in o pto-electronic devices, camera, optical disc and projector lens etc. has been i ncreased rapidly in the recent years. The key technologies of fabrication of asp heric plastic lens are the design and manufacturing moulds, selection of proper injection moulding equipment, and optimization of injection moulding parameters etc. In this paper, the effect of injection pressure, moulding temperature, cool ing time and injection speed on the surface profile of the lenses during injecti on and holding process is investigated. Surface quality of plastic lenses is mea sured by Talysurf Texture Measuring System. The experimental results showed that the injection pressure and moulding temperature are important parameters compar ing to cooling time and injection speed. A bit change of injection pressure or m oulding temperature will affect the property of the surface profile. Either incr easing injection pressure or mould temperature can achieve less shrinkage. Other wise, a lower injection pressure will produce more shrinkage, more air traps and a lower mould temperature results greater warp and higher shrinkage. The dynami c process of injection for optical plastic lenses is simulated by 3D Moldflow pl astic Insight software (MPI). The MPI will help us to optimize injection mouldin g parameters.

关键词： injection moulding aspheric lens optical compon ent optimization

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Profile error compensation in precision grinding of ellipsoid optical surface

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Chinese Journal of Aeronautics 2021年第4期34卷 115-123页

作者： Shimeng YU Jiahao ZHU Peng YAO Chuanzhen HUANG Center for Advanced Jet Engineering Technologies(CaJET) School of Mechanical EngineeringShandong UniversityJinan 250061China Key Laboratory of High Efficiency and Clean Mechanical Manufacture Shandong UniversityMinistry of EducationJinan 250061China

Optical glass elements with the ellipsoidal surface are used in many critical aerospace instruments,such as satellites,telescope and cameras.Their optical performance is mainly affected by profile accuracy and surface quality.In this paper,a rectangular ellipsoid surface is precisely ground on a BK7 optical glass blank by grating scanning grinding path with a three-axis CNC precision surface grinder.A profile error compensation procedure for ellipsoidal grinding is proposed based on the error analysis about the primary error sources in the XY and YZ projection planes during the grinding process.The mathematical prediction models of the wheel arc profile error,the measurement and wear error of the grinding wheel radiuses are established.By applying the proposed error compensation procedure,the profile accuracy of the ellipsoidal surface was improved from 4 lm to 2 lm in the XY plane,and improved from 15 lm to 5 lm in the YZ plane.

关键词： aspheric lens Ellipsoid surface Error compensation Grinding wheel truing Precision grinding

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