Geometrical Accuracy and Optical Performance of Injection Moulded and Injection-compression Moulded Plastic Parts

Michaeli, Walter; Hessner, Sebastian; Klaiber, Fritz; Forster, Jan

doi:10.1016/j.cirp.2007.05.130

Cited by 47 publications

(24 citation statements)

References 3 publications

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“…Therefore, micro injection-compression molding (lICM) will be used to reduce shrinkage and improve surface quality of the microlenses (Young 2005;Ito et al 2009;Wu et al 2006;Michaeli et al 2007) and to simulate the injection-compression molding process (Chen et al 2000). Furthermore, the optical and mechanical properties will be characterized and predicted to produce high quality microlens arrays (Huang et al 2008;Fan et al 2004).…”

Section: Characterization Of Injection Molded Microlens Arraysmentioning

confidence: 99%

Replication of precise polymeric microlens arrays combining ultra-precision diamond ball-end milling and micro injection molding

et al. 2012

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A simple and novel combination of ultra-precision diamond ball-end milling and micro injection molding technique is described to produce precise microlens arrays out of polycarbonate (PC), polymethylmethacrylate (PMMA) as well as polystyrene (PS). The microlens arrays consist of 100 lenses in a 10 9 10 array with a lens radius of 273 lm, a lens diameter of 300 lm and a lens depth of 45 lm. Pitch between the lenses is fixed at 800 lm. The injection molding parameters were optimized to get precise microlens geometries with low surface roughness. The results show a precise diamond milled mold insert and injection molded microlens arrays with minor deviations in radius and surface roughness of the microlenses, particularly for microlens arrays out of PMMA.

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Section: Characterization Of Injection Molded Microlens Arraysmentioning

confidence: 99%

Replication of precise polymeric microlens arrays combining ultra-precision diamond ball-end milling and micro injection molding

et al. 2012

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“…micro gears); (b) overall dimensions in the macro range, weight in the order of grams, tolerance requirements that are effectively expressed in terms of micrometers down to nanometres (e.g. lenses [14]) and/or areas with micro features having critical dimensions in the micro-and nanometre range (e.g. digital versatile discs).…”

Section: Case Descriptionmentioning

confidence: 99%

Applications of dimensional micro metrology to the product and process quality control in manufacturing of precision polymer micro components

2009

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“…A more detailed description of the process and requirements for the molding tool can be found elsewhere [10,11]. To fabricate high-quality polymer optics by injection (compression) molding, understanding and control of the process is mandatory, since even small variations, deviations or defects affect significantly the quality of the optical part [12].…”

Section: Introductionmentioning

confidence: 99%

Influences on the Fabrication of Diffractive Optical Elements by Injection Compression Molding

Roeder¹,

Schilling²,

Hera³

et al. 2018

JMMP

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Abstract:Polymer optics are widely used in various applications, replacing traditional glass lenses. The ability to create free-form and micro-structured optics, as well as fast replication, gives them major advantages over traditional glass lenses. However, the fabrication of complex optical components requires full process control and understanding of influencing factors on the quality of the polymer optical parts. In this work, a curved diffractive optical element (DOE) is fabricated using injection compression molding. Different gate designs were evaluated and the movement of the compression stamper was optimized to obtain good filling behavior. The process stability was analyzed and improved by controlling the melt temperature precisely. Finally, the molding parameters were optimized, focusing on the mold temperature, melt temperature and compression force. Curved diffractive optical elements were replicated with feature sizes of 1.6 µm. The experiments showed that all aspects of the molding process have to be controlled perfectly to produce complex polymer optics. High mold temperatures and compression force are necessary to replicate micro-structured features. The work presents a broad investigation and description of the fabrication process and their influences.

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Geometrical Accuracy and Optical Performance of Injection Moulded and Injection-compression Moulded Plastic Parts

Cited by 47 publications

References 3 publications

Replication of precise polymeric microlens arrays combining ultra-precision diamond ball-end milling and micro injection molding

Replication of precise polymeric microlens arrays combining ultra-precision diamond ball-end milling and micro injection molding

Applications of dimensional micro metrology to the product and process quality control in manufacturing of precision polymer micro components

Influences on the Fabrication of Diffractive Optical Elements by Injection Compression Molding

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