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conductive cement for a festoon lamp

IP.com Disclosure Number: IPCOM000008915D
Publication Date: 2002-Jul-24
Document File: 1 page(s) / 9K

Publishing Venue

The IP.com Prior Art Database



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ID 301217


Philips makes an electrical contact for festoon lamp between the wire and the outside of the metallic cap with a lead soldering flux (welding). Cement is used to assembly and seal the cap with glass bulb. For environmental reasons, it would be better to make a 100% green lamp without lead. Furthermore, there are some troubles with the current process because of the poor reliability of the welding (mechanical resistance and influence of the cement degassing). The invention consists in suppressing the welding outside the cap by using conductive cement inside the cap. Thus, the electrical connection is realised by the contact of the wire on the internal side of the cap and by the conductive cement around (see figures below)

Background Invention

A publishing of this invention is wanted.

Disclosed anonymously.

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