Scanning-projection based stereolithography: Method and structure

Mohammad Mahdi Emami, Farshad Barazandeh, Farrokh Yaghmaie

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Projection-based stereolithography (PSL) is an efficient way for rapid fabrication of 3D structures. However, it is suitable for small parts requiring high resolution. The scanning-based SL (SSL) covers a larger area with a lower resolution. Fabrication time in PSL is intrinsically less than SSL due to exposing an entire image field in a single shot. This study introduces a new scanning-projection based stereolithography (SPSL) to include the advantages of both former methods. SPSL takes advantage of a digital micromirror device (DMD) and a moving stage to combine the projection and scanning methods. The DMD moves continuously over the medium while the projected pattern is continuously updated to allow the fabrication of large layers. After modeling the approach, an experimental setup is assembled to produce real parts. An economical ultra violet light-emitting diode (UV-LED) is used as a light source for curing. Seven 3D models with defined geometry consisted of circular, rectangular, complex and overhanging parts are selected. Five copies of each model are built. The experimental results show that the method is feasible and versatile. The achieved standard deviation is lower than 32 μm.

Original languageEnglish
Pages (from-to)116-124
Number of pages9
JournalSensors and Actuators, A: Physical
Volume218
Early online date12 Aug 2014
DOIs
Publication statusPublished - 1 Oct 2014

Keywords

  • Additive manufacturing
  • DMD
  • Large area exposure
  • Maskless fabrication
  • Micromirror
  • Scanning projection stereolithography

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering

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