Study on optical freeform surface manufacturing of progressive addition lens based on fast tool servo

3rd International Conference on Advances in Energy, Environment and Chemical Engineering

能源学;生态环境科学;化学工业

Cai, Hongbin^1 ; Xu, Junlong^1 ; Xiao, Jianguo^2 ; Zhang, Yunfei^1 ; Shi, Guoquan^3

College of Electro-Mechanical Engineering, Changchun University of Science and Technology, Changchun

130000, China^1

Yunnan Kiro-CH Photonics CO. LTD., Kunming

650000, China^2

Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou

215000, China^3

关键词: Free-form surface;    Intermediate zone;    Interpolation error;    Interpolation method;    Matlab simulations;    Optical freeform surfaces;    Progressive addition lens;    State of the art;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/69/1/012130/pdf
DOI  :  10.1088/1755-1315/69/1/012130

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Progressive addition lens (PAL) is currently the state-of-the-art in multifocal correction visual for freeform lens. The PAL is used to correct presbyopia by the distributing optical powers of the three zones, which are far zone, near zone and intermediate zone. As the dioptre of progressive zone varies continuously, the lenses realize simultaneously far view and near view by a pair of glasses. Because the PAL is a freeform surface with a variable radius of curvature, complex shape, processing difficulties, low efficiency, big fluctuation of interpolation error and so on. In this paper, the design surface is discretized by the constant angle method and compensates the path of the diamond tool nose radius with AKIMA interpolation method, which can identify the machine tool of the tool locus, and exploitable fast tool servo technology controls the diamond tools movement and path. MATLAB simulation results show that this method is generally more approximate to the ideal trajectory, which is not only to ensure that surface profile accuracy, but also meet the requirements of the processing efficiency and better control the surface profile.