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Ticona Vectra® Withstands Lead-Free Soldering
LED packaging with lenses.
Florence, KY — Injection molded LED packages for high-brightness lighting applications must withstand temperatures above 260°C during lead-free soldering and be produced in fine detail with great precision. To do this with the millions of LED open-cavity packages it produces each year, Spectrum Plastics turned to the Vectra® S series liquid crystal polymers (LCP) from Ticona., The high-flow of Vectra S grades produces LED packages having complex geometries and tight tolerances in packages with typical outline dimensions of 2 to 7mm square. These resins also withstand temperatures well above 300°C, undergo minimal dimensional change in molding and end use, and have negligible outgassing so their volatiles do not fog lenses or degrade contacts.

Spectrum Plastics fabricates LED packages in a continuous molding process using its proprietary reel-to-reel technology, which overmolds open cavities onto strips of lead frames in a multi-station line using multi-cavity tools. The customer then populates the cavities with die that serve as the light source, wire bonds the unit, adds a lens (also molded by Spectrum), and stamps the completed package out of the strip.

Spectrum molds the lenses from an optical grade of silicone rubber that withstands reflow soldering. In a process it innovated, it overmolds lenses on metal rings on a stainless steel strip. The ring supports the lens when the customer assembles it to the LCP cavities. The use of lead-frame molding principles provides for a high-volume, automated process that minimizes part handling and enhances quality.

For more information, contact: Ticona (a business of Celanese Corporation), 8040 Dixie Highway, Florence, Kentucky 41042 800-833-4882 or 859-372-3244 fax: 859-372-3125 Web: http://www.ticona.com

 

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