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An Investigation of Form Errors Predicted Model for Injection Moulded Aspheric VCD Lens

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Abstract:

The aspheric VCD lens is hard to fabricate by injection moulding due to its small volume and high precision requirement. The processing conditions have critical effects on the quality of the moulded lenses. An optic lens needs precisely controlled surface contours, so determination of the processing conditions for lens moulding becomes very complicated. This study’s purpose is to investigate experimentally some effects of the moulding conditions on the form errors of injection moulded lens. An aspheric VCD lens was moulded using polymethyl methacrylate. Different combinations of moulding conditions were used focusing on moulding process parameters of the ram speed, the mould temperature, the melt temperature and the packing pressure, The predicted model of form errors was formulated by orthogonal and regression analysis. Finally, the predicted model is proven to be valid based on the residual diagnostic plots.

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Periodical:

Key Engineering Materials (Volumes 364-366)

Pages:

123-127

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.364-366.123

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Online since:

December 2007

Authors:

Suet To, Bing Yan Jiang, Can Weng, Wing Bun Lee

Keywords:

Aspheric VCD Lens, Form Error, Injection Molding, Regression Model

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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