Syarifah Nur Hasanah, Syed Kamarudin and Lee, Helen and Ismayuzri, Ishak and Ahmad Rosli, Abdul Manaf and Ahmad Shahir, Jamaludin and Mohd Ali Hanafiah, Shaharudin and Mohd Zairulnizam, Mohd Zawawi (2021) Rapid Direct Continuous Method for Hot Embossing of Glass Microlens Array Combined with CO2 Laser Irradiation and External Preheating/Cooling. In: Recent Trends in Manufacturing and Materials Towards Industry 4.0: Selected Articles from iM3F 2020, Malaysia , 6 August 2020 , Virtually hosted by Universiti Malaysia Pahang. pp. 669-675.. ISBN 978-981-15-9505-9
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Abstract
Hot embossing of glass micro structures requires long thermal cycle, generally takes no less than 15 min due to the isothermal heating, pressing and cooling performed inside a closed vacuum chamber. In this paper, a new hot embossing procedure was presented. First, the glass was preheated slightly below its glass transition temperature at the heating station. Then, a thin layer of the glass surface was further raised to high temperature temporarily through CO2 laser irradiation. The glass was then quickly transferred to the embossing station for pattern transfer, demolding and followed by external cooling. This method accelerated the filling of glass material into the microlens array mold cavities and outperforms the conventional method in terms of overall cycle time reduction, lower mold working temperature and embossing pressure. Microlens array with diameter of 135 µm, sag height of 18.5 µm and pitch of 200 µm were faithfully embossed onto the K-PG375 optical glass time in a time scale of about ~3 s. Optical evaluation of the glass MLA was also performed using charge couple device (CCD) camera which showed uniform spot intensity.
| Item Type: | Conference or Workshop Item (Lecture) |
|---|---|
| Additional Information: | Lecture Notes in Mechanical Engineering, Indexed by Scopus |
| Uncontrolled Keywords: | CO2 laser, Micro lens array, Hot embossing, Optical glass |
| Subjects: | T Technology > TS Manufactures |
| Faculty/Division: | Institute of Postgraduate Studies Faculty of Manufacturing and Mechatronic Engineering Technology |
| Depositing User: | Noorul Farina Arifin |
| Date Deposited: | 13 Feb 2023 03:26 |
| Last Modified: | 13 Feb 2023 03:26 |
| URI: | http://umpir.ump.edu.my/id/eprint/36989 |
| Download Statistic: | View Download Statistics |
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