Skip to content
6CCVD Research

Micro-embossing of micro-structures in RSA-501 as mold inserts for the replication of micro-lens arrays

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2022-12-01
JournalResults in Engineering
AuthorsJ. Kober, Daniel Alexandre RolĆ³n, Florian Hƶlzel, Stefan KĆ¼hne, Dirk Oberschmidt
InstitutionsTechnische UniversitƤt Berlin, Leibniz Institute of Surface Engineering
Citations4

Abstract

Section titled ā€œAbstractā€

The production of mold inserts for the replication of micro-lens arrays through micro-embossing could be an alternative process route compared to diamond turning or milling in order to reduce time and costs. The rapidly solidified aluminum alloy RSA-501 is expected to form micro-structures with low surface roughness because of its ultra-fine grain structure. In micro-embossing challenges like elastic spring back effect, pile-ups, and forming accuracy depend on the material behavior. Therefore, RSA-501 was further characterized and the influence of polishing or flycutting on the material behavior was investigated. To further understand the grain and microstructure samples were sectioned along their cross and longitudinal directions. The grain structure of RSA-501 was oriented along the extrusion direction and the mean grain sizes were <1.00 Ī¼m. Furthermore, RSA-501 was micro-embossed to investigate the influence of the material behavior and surface preparation on the forming of micro-structures. The induced surface integrity through flycutting was not deep enough to influence the forming of micro-structures. Therefore, the workpiece surface can be prepared either by polishing or flycutting. When micro-embossing RSA-501, cross and longitudinal sections can be used. However, it is recommended to process the cross section because of its isotropic grain structure. It was shown that the curvature radius of micro-embossed concave structures differs from the tool radius. This is due to the elastic spring back effect. Since the embossed structure remains spherical, the spring back effect can be compensated by adjusting the tool radius.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

References

Section titled ā€œReferencesā€
  1. 2006 - Micro-optical artificial compound eyes [Crossref]
  2. 2018 - Fabrication of microlens array and its application: a review [Crossref]
  3. 1989 - Variations in the structure and design of compound eyes
  4. 1996 - Light field rendering [Crossref]
  5. 2011 - Diamond milling or turning for the fabrication of micro lens arrays: comparing different diamond machining technologies
  6. 2021 - Microlenses arrays: fabrication, materials, and applications [Crossref]
  7. 2012 - Replication of precise polymeric microlens arrays combining ultra-precision diamond ball-end milling and micro injection molding [Crossref]
  8. 2011 - Freeform manufacturing of a microoptical lens array on a steep curved substrate by use of a voice coil fast tool servo [Crossref]
  9. 2020 - Technological investigation for production of metallic micro-optics employing embossing process

Reads Similar to This

CVD Encapsulation of Laser-Graphitized Electrodes in Diamond Electro-Optical Devices Fiber-Coupled Diamond Micro-Waveguides toward an Efficient Quantum Interface for Spin Defect Centers Application of mesh-free and finite element methods in modelling nano-scale material removal from copper substrates - A computational approach