Metallized film-over-foam contacts
View Patent ↗A metallized film-over-foam contact suitable for circuit grounding of surface mount technology devices generally includes a silicone foam resilient core member, a solderable electrically conductive layer, and an adhesive bonding the solderable electrically conductive layer to the resilient core member. The adhesive has no more than a maximum of 900 parts per million chlorine, no more than a maximum of 900 parts per million bromine, and no more than a maximum of 1,500 parts per million total halogens.
1. A metallized film-over-foam contact for circuit grounding of surface mount technology devices, the contact comprising:
a resilient core member;
a solderable electrically conductive layer including a metallized film; and
an adhesive bonding the solderable electrically conductive layer to the resilient core member, the adhesive having no more than a maximum of 900 parts per million chlorine, no more than a maximum of 900 parts per million bromine, and no more than a maximum of 1,500 parts per million total halogens;
whereby the contact includes a plate positioned between the contact and a solder pad, wherein the plate and the solder pad are coupled with the contact via solder paste, whereby the plate operates to provide a rigid structure to the contact and separate the contact from the solder pad.
2. The contact of claim 1 , wherein the contact has a flame rating of V-0 under Underwriter's Laboratories (UL) Standard No. 94.
3. The contact of claim 1 , wherein the contact has a flame rating of V-1, V-2, or HB under Underwriter's Laboratories (UL) Standard No. 94.
4. The contact of claim 1 , wherein the solderable electrically conductive layer includes a metallized polyimide film.
5. The contact of claim 1 , wherein the contact has no more than a maximum of 900 parts per million chlorine, no more than a maximum of 900 parts per million bromine, and no more than a maximum of 1,500 parts per million total halogens.
6. The contact of claim 1 , wherein the contact is able to withstand solder reflow conditions and temperatures and maintain operational structural integrity following a solder reflow operation.
7. A halogen-free metallized film-over-foam contact for circuit grounding of surface mount technology devices, the contact comprising:
a resilient core member;
a metal composition film surrounding at least part of the resilient core member and that is solderable; and
an adhesive bonding the metal composition film to the resilient core member;
wherein the resilient core member, the metal composition film, and the adhesive combined have no more than a maximum of 900 parts per million chlorine, no more than a maximum of 900 parts per million bromine, and no more than a maximum of 1,500 parts per million total halogens such that the contact is halogen free; and
wherein the contact has a flame rating of V-0 under Underwriter's Laboratories (UL) Standard No. 94;
whereby the contact includes a plate positioned between the contact and a solder pad, wherein the plate and the solder pad are coupled with the contact via solder paste, whereby the plate operates to provide a rigid structure to the contact and separate the contact from the solder pad.
8. The contact of claim 7 , wherein the metal composition film includes a metallized polyimide film.
9. The contact of claim 7 , wherein the contact is able to withstand solder reflow conditions and temperatures and maintain operational structural integrity following a solder reflow operation.
10. A method of installing a flame retardant, halogen free metallized film-over-foam contact to a surface of a printed circuit board, the contact including a resilient core and a metallized film surrounding at least part of the resilient core, the method comprising soldering the metallized film of the halogen free contact to a surface of a printed circuit board via a plate and a solder pad where the plate is positioned between the contact and the solder pad; and coupling the solder pad with the contact via solder paste whereby the plate is configured to provide a rigid structure to the contact and separate the contact from the solder pad, whereby an electrical pathway is established from the printed circuit board to the contact through the metallized film, wherein the contact has no more than a maximum of 900 parts per million chlorine, no more than a maximum of 900 parts per million bromine, and no more than a maximum of 1,500 parts per million total halogens.
11. The method of claim 10 , further comprising placing the contact using a surface mount technology machine onto a ground trace of the printed circuit board, wherein the ground trace is pre-screened with the solder paste.
12. The method of claim 11 , further comprising performing a solder reflow operation while the contact is on the solder paste to thereby solder the contact to the ground trace of the printed circuit board.
13. The method of claim 10 , wherein the contact has a flame rating of V-0 under Underwriter's Laboratories (UL) Standard No. 94.
14. The method of claim 10 , wherein the contact has a flame rating of V-1, V-2, or HB under Underwriter's Laboratories (UL) Standard No. 94.
15. The method of claim 10 , wherein the contact is able to withstand solder reflow conditions and temperatures and maintain operational structural integrity following a solder reflow operation.
16. The contact of claim 1 , wherein:
the resilient core member comprises silicone foam;
the solderable electrically conductive layer includes a metallized polyimide film;
the contact has no more than a maximum of 900 parts per million chlorine, no more than a maximum of 900 parts per million bromine, and no more than a maximum of 1,500 parts per million total halogens; and
the contact has a flame rating of V-0 under Underwriter's Laboratories (UL) Standard No. 94.
17. The contact of claim 16 , wherein the contact is able to withstand solder reflow conditions and temperatures up to at least about 280 degrees Celsius and maintain operational structural integrity following a solder reflow operation.
18. The contact of claim 7 , wherein:
the resilient core member comprises silicone foam;
the metal composition film includes a metallized polyimide film; and
the contact is able to withstand solder reflow conditions and temperatures up to at least about 280 degrees Celsius and maintain operational structural integrity following a solder reflow operation.
19. The contact of claim 18 , wherein the silicone foam has a density of about 15 pounds per cubic foot or more.
20. The method of claim 10 , wherein:
the resilient core comprises silicone foam;
the metallized film includes a metallized polyimide film; and
the contact has a flame rating of V-0 under Underwriter's Laboratories (UL) Standard No. 94.