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Proceedings Paper

Design considerations and manufacturing limitations of Insert Precision Glass Molding (IPGM)
Author(s): Alan Symmons; Bryan Auz
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Paper Abstract

Precision glass molding (PGM) directly into metallic structures is a process similar to the plastic injection molding process of insert molding, however fundamental differences exist due to the processing temperatures, nature of materials and manufacturing requirements. Despite some limitations, insert precision glass molding (IPGM) extends many benefits to the product designer. IPGM occurs at the glass transition temperature of the glass therefore materials must be matched by their thermal properties so that undue stress is not exerted on the glass during processing or significant inherent stress left in the part after processing. Either of these conditions could lead to cracking, birefringence or failures due to thermal cycling during operation. This paper will discuss the techniques and specific design considerations that must be taken into account when designing for IPGM. Design aspects such as interface diameters, wall thicknesses, aspect ratios and material properties will be analyzed. The optical and mechanical performance and properties of the glass and holder assembly will also be reviewed, including strength of the assembly, quality of the sealing interface (hermeticity), optical to mechanical alignment and impact on optical quality. The review includes both chalcogenide and traditional oxide based moldable glasses.

Paper Details

Date Published: 19 October 2012
PDF: 22 pages
Proc. SPIE 8489, Polymer Optics and Molded Glass Optics: Design, Fabrication, and Materials II, 84890H (19 October 2012); doi: 10.1117/12.932253
Show Author Affiliations
Alan Symmons, LightPath Technologies, Inc. (United States)
Bryan Auz, LightPath Technologies, Inc. (United States)


Published in SPIE Proceedings Vol. 8489:
Polymer Optics and Molded Glass Optics: Design, Fabrication, and Materials II
David H. Krevor; William S. Beich; Michael P. Schaub; Stefan M. Bäumer, Editor(s)

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