US EPA

2945249 

Journal Article 

Concepts for 3D print productivity systems with advanced DLP photoheads 

Jacobsen, A; Jorgensen, T; Tafjord, O; Kirkhorn, E 

2015 

Unk 

Proceedings of SPIE
ISSN: 0277-786X
EISSN: 1996-756X 

Proceedings of SPIE 

9376 

10.1117/12.2084962 

WOS:000353896200002 

Direct Imaging with DLP r Photoheads is becoming an established technology in productivity systems for PCB Lithography and similar applications. Scrolling technology is used to expose large areas and is enabling highest levels of productivity and efficiency, while maintaining full flexibility of direct imaging concepts. Specific features such as SPX (subpixelation) and PPC (pixel power control) technologies have further enhanced resolution of printed structures, as well as precision and uniformity of the exposure across the entire field. 3D print systems with photosensitive resins can conceptually be seen as an extension of 2D Direct Imaging systems into the third dimension. The scrolling technique then allows to enlarge the build area by freely multiplying the photohead's static build area with native pixel pitch in both, x and y dimensions. In addition, SPX technology in 3D print systems would enable 2 different advanced options. Either it offers improved (reduced) edge roughness of structures, by fine pitching the native pixel pitch. Or a larger native pixel pitch can be chosen, still providing the same fine pitched edge roughness and surface finish as a native system with proportionally smaller build area. 

DLP photohead; direct imaging; 3D print; additive manufacturing; PCB lithography; subpixelation; multiplexing; pixel power control