A Study of Two-Stage Micro Injection Compression Molding Process for Diffractive Optical Lens

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This research aimed to develop a novel two-stage micro injection compression molding (μ-ICM) process for fabrication of plastic diffractive optic elements (DOE). The DOE was designed with the spherical coefficients and the Fresnel lens. A piezo actuator was installed inside the mold plate for activating the mold insert for the second compression motion for micro ICM of the DOE lens. The first experiment proceeded to find the operation window of Fresnel lens and then compare the product weight of flat spherical lens by injection molding (IM), injection compression molding (ICM) and μ-ICM. The second experiment was to investigate the effectiveness of micro compression activated by the piezo actuator by the transfer ratio of grooves (TRG) of the DOE lens with spherical lens and Fresnel lens. Results showed that the μ-ICM of the DOE can obtain the highest TRG than that of IM and conventional ICM processes. Therefore, results of this research can be explored to related aspheric optical elements with micro features, such as fine lens used in the zoom lens of camera.

Info:

Periodical:

Key Engineering Materials (Volumes 364-366)

Edited by:

Guo Fan JIN, Wing Bun LEE, Chi Fai CHEUNG and Suet TO

Pages:

1211-1214

Citation:

C. C. A. Chen and S. C. Kao, "A Study of Two-Stage Micro Injection Compression Molding Process for Diffractive Optical Lens ", Key Engineering Materials, Vols. 364-366, pp. 1211-1214, 2008

Online since:

December 2007

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$38.00

[1] C-C.A. Chen, Yung-Kun Chen and Shian-Wen Chang, Mold Filling in Injection Molding of Thin Plate with Double-Side Micro Grooves,: paper submitted to the International Polymer Processing (2006).

[2] K. Shen, S.Y. Yang, W.Y. Wu, H.M. Jian and C-C.A. Chen, Study on Numerical Simulation and Experiment of Lightguide Plate in Injection Molding,: Journal of Reinforced Plastics and Composites Vol. 23 No. 11 (2004), p.1187.

DOI: https://doi.org/10.1177/0731684404037040

[3] C. Yan, M. Nakao, T. Go, K. Matsumoto, Y. Hatamura, Injection molding for microstructures controlling mold-core extrusion and cavity heat-flux,: Microsystem Technologies No. 9 (2003), p.188.

DOI: https://doi.org/10.1007/s00542-002-0262-y

[4] Kiyohito Gotoh and Hiromi Ichioka, Injection Compression Molding Method for Optically Molded Products, U. S. Patent 6705725 (2004).

[5] Y. Takaki and H. Nakanuma, Improvement of multiple imaging system used for natural 3D display which generates high-density directional images,: Proceedings of SPIE 5243 (2003), p.42.

DOI: https://doi.org/10.1117/12.530123

[6] S.W. Min, S. Jung, J.H. Park, B. Lee, Study for wide-viewing integral photography using an aspheric Fresnel-lens array,: Optical Engineering 41(10) (2002), p.2572.

DOI: https://doi.org/10.1117/1.1499974