Source: http://www.google.com/patents/US7866263?dq=6377161
Timestamp: 2014-09-02 02:17:17
Document Index: 106618496

Matched Legal Cases: ['art.\n1', 'art.\n3', 'art.\n6', 'art.\n13', 'art.\n16', 'art 2']

Patent US7866263 - Glass-metal feedthrough, a method of fabricating it, and an electro ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA glass-metal feed-through transmits an electrical signal from one face to another face that is opposite. The feed-through includes a glass plug, two metal pins passing through the plug, and a metal part surrounding the plug. The feed-through includes an electrically-conductive link between a first of...http://www.google.com/patents/US7866263?utm_source=gb-gplus-sharePatent US7866263 - Glass-metal feedthrough, a method of fabricating it, and an electro-pyrotechnic initiator including itAdvanced Patent SearchPublication numberUS7866263 B2Publication typeGrantApplication numberUS 12/084,218PCT numberPCT/EP2006/068273Publication dateJan 11, 2011Filing dateNov 9, 2006Priority dateNov 9, 2005Also published asCN101305258A, CN101305258B, EP1946036A1, EP1946036B1, US20090158953, WO2007054530A1Publication number084218, 12084218, PCT/2006/68273, PCT/EP/2006/068273, PCT/EP/2006/68273, PCT/EP/6/068273, PCT/EP/6/68273, PCT/EP2006/068273, PCT/EP2006/68273, PCT/EP2006068273, PCT/EP200668273, PCT/EP6/068273, PCT/EP6/68273, PCT/EP6068273, PCT/EP668273, US 7866263 B2, US 7866263B2, US-B2-7866263, US7866263 B2, US7866263B2InventorsAlain Magne, Adelino Carrol, Gr�gory MinuzzoOriginal AssigneeAutoliv Development AbExport CitationBiBTeX, EndNote, RefManPatent Citations (14), Classifications (10), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetGlass-metal feedthrough, a method of fabricating it, and an electro-pyrotechnic initiator including itUS 7866263 B2Abstract A glass-metal feed-through transmits an electrical signal from one face to another face that is opposite. The feed-through includes a glass plug, two metal pins passing through the plug, and a metal part surrounding the plug. The feed-through includes an electrically-conductive link between a first of the pins and the part. The link includes a brazing preform secured to the first pin and to the part.
1. A glass-metal feed-through for transmitting an electrical signal from one face to another face that is opposite, the feed-through comprising:
two electrically-conductive metal pins for conveying the electrical signal, the pins passing through the glass plug, being secured thereto, and projecting from said two opposite faces of the plug;
an electrically-conductive metal part surrounding the glass plug between the two opposite faces of the plug, the two opposite faces each defining a continuous single planar surface within a perimeter of each face, the glass plug being directly sealed to the metal part; and
an electrically-conductive link directly connecting a first of the two metal pins and the metal part, disposed directly on a first face of the two opposite faces of the plug, the first face being a bottom face, the electrically-conductive link being a brazing preform disposed directly on the bottom face and secured to the first pin and to the metal part, the brazing preform suitable for unconditionally conducting electricity directly between the first pin and the metal part and surrounding only the first pin of the two metal pins.
2. The glass-metal feed-through according to claim 1, wherein the brazing preform is in the form of a washer surrounding the first pin and disposed directly on the first face of the glass plug, the washer directly connecting the first pin to the metal part.
3. The glass-metal feed-through according to claim 1, wherein the brazing preform forms a facing around the first pin directly on the first face.
4. The glass-metal feed-through according to claim 1, wherein the brazing preform has a thickness between approximately 0.3 mm and approximately 0.5 mm.
5. The glass-metal feed-through according to claim 1, wherein the brazing preform is made of a brazing metal or of a brazing metal alloy having a liquidus temperature lying between a liquidus temperature of the glass plug and a maximum sealing temperature of the glass plug in the metal part.
6. The glass-metal feed-through according to claim 1, wherein the brazing preform is made of a brazing metal alloy selected from a group including copper-silver alloys, copper-silver-nickel alloys and combinations thereof.
7. The glass-metal feed-through according to claim 1, wherein the pins are substantially identical.
8. The glass-metal feed-through according to claim 1, wherein the pins have a constant cross section along their lengths.
9. The glass-metal feed-through according to claim 1, wherein the metal part has substantially the same height as the glass plug between the two opposite faces.
10. A method of fabricating a glass-metal feed-through according to claim 1, comprising:
placing the brazing preform around the first pin, the first pin passing through a hole in the brazing preform;
sealing the glass plug in the metal part; and
brazing the brazing preform to the metal part and to the first pin in a single pass through an oven.
an insulating printed circuit plate having a first face on which there is a resistive heater element for heating the pyrotechnic charge, the heater element being covered by the charge, and a second face opposite from the first face; and
a glass-metal feed through, including:
a glass plug having first and second opposite faces, the first and second opposite faces each defining a continuous single planar surface within a perimeter of each face;
two electrically-conductive metal pins for conveying an electrical signal, the pins passing through the glass plug, being secured thereto, and projecting from said two opposite faces of the plug;
an electrically-conductive metal part surrounding the glass plug between the two opposite faces of the plug, the metal part having substantially the same height as the glass plug between the two opposite faces, wherein the cap surrounds the metal part and includes a height greater than the height of the metal part; and
an electrically-conductive link directly connecting a first of the two metal pins and the metal part, disposed directly on a first face of the two opposite faces of the plug, the first face being a bottom face, the electrically-conductive link being a brazing preform disposed directly on the bottom face and secured to the first pin and to the metal part, the brazing preform suitable for unconditionally conducting electricity directly between the first pin and the metal part and surrounding only the first pin of the two metal pins;
wherein the glass-metal feed-through supporting supports the second face of the insulating printed circuit plate on the second face of the plug, opposite from the first face of the plug, and closes off the cap;
wherein the two metal pins are electrically connected to the resistive heater element.
12. The electro-pyrotechnic initiator of claim 11, wherein the brazing perform is in the form of a washer surrounding the first pin and disposed directly on the first face of the glass plug, the washer directly connecting the first pin to the metal part.
13. The electro-pyrotechnic initiator of claim 11, wherein the brazing perform forms a facing around the first pin directly on the first face.
14. The electro-pyrotechnic initiator of claim 11, wherein the brazing perform has a thickness between approximately 0.3 mm and approximately 0.5 mm.
15. The electro-pyrotechnic initiator of claim 11, wherein the brazing perform is made of a brazing metal or of a brazing metal alloy having a liquidus temperature lying between a liquidus temperature of the glass plug and a maximum sealing temperature of the glass plug in the metal part.
16. The electro-pyrotechnic initiator of claim 11, wherein the brazing preform is made of a brazing metal alloy selected from a group including copper-silver alloys, copper-silver-nickel alloys and combinations thereof.
17. The electro-pyrotechnic initiator of claim 11, wherein the pins are substantially identical.
18. The electro-pyrotechnic initiator of claim 11, wherein the pins have a constant cross section along their lengths.
19. The glass-metal feed-through according to claim 11, wherein the brazing preform is disposed on the bottom face so as to be raised above the single planar surface.
CROSS-REFERENCE TO RELATED APPLICATIONS This application is a 371 National Stage of International Application No. PCT/EP2006/068273, filed Nov. 9, 2006 and published in English as WO 2007/054530 A1 on May 18, 2007. This application claims the benefit of French Patent Application 05 11404, filed Nov. 9, 2005. The disclosures of the above applications are incorporated herein by reference.
a glass plug; two electrically-conductive metal pins for conveying the electrical signal, the pins passing through the glass plug, being secured thereto, and projecting from said two opposite faces of the plug; and an electrically-conductive metal part surrounding the glass plug between the two opposite faces of the plug; the feed-through being characterized in that it further comprises:
electrically-conductive link means between a first of the two metal pins and the metal part, disposed on the bottom, first face of the plug; and the electrically-conductive link means being constituted by a brazing preform secured to the first pin and to the metal part and suitable for conducting electricity between the first pin and the metal part. The invention presents the advantage of better reproducibility, in particular because of the coaxial first pin being brazed directly to the metal part. The invention avoids the need for an intermediate cover piece provided with a coating and that is accurately complementary in shape to the glass plug as is required in above-mentioned document U.S. Pat. No. 6,755,670, thereby simplifying the provision of the connection between the coaxial first pin and the metal part.
a cap containing a pyrotechnic charge; an insulating printed circuit plate having a first face on which there is a resistive heater element for heating the pyrotechnic charge, the heater element being covered by the charge, and a second face opposite from the first face; the initiator being characterized in that it includes:
a glass-metal feed-through as described above, that supports the second face of the insulating printed circuit plate on the second face of the plug, opposite from the first face of the plug, and that closes of the cap; the two metal pins being electrically connected to the resistive heater element. In a third aspect, the invention provides a method of fabricating a glass-metal feed-through as described above, characterized in that:
As shown in FIG. 4, when the assembled feedthrough 1 is mounted in an electro-pyrotechnic initiator 100, the top second face 32 is the face that faces towards the pyrotechnic charge 22, 23 for igniting the initiator, while the bottom first face 31 is the face that should face to the outside. The pyrotechnic charge 22, 23 is enclosed between the top, second face 32 and a metal cap 6 clamped around the outside face 25 of the metal part 2. The feedthrough 1 thus closes the open end of the cap 6 and is secured thereto. The bottom first face 31 of the feedthrough 1 and the bottom portion of the cap 6 may optionally be enclosed in overmolding (e.g. of plastics material). The overmolding enables the igniter to be fitted to the generator.
On its top second face 32, the plug 3 is provided with an electrically insulating plate 15 that has the two top ends 4 a and 5 a of the pins 4 and 5 passing therethrough. The top, first face 18 of the plate 15 carries a printed circuit including a resistive heater element 21 which is connected by printed conductor tracks to the two ends 4 a and 5 a of the two pins 4 and 5 that project beyond the face 18. The top surface 24 of the resistive heater element 21 is in contact with and covered by the priming pyrotechnic charge 22 which is itself covered by the ignition pyrotechnic charge 23. Opposite from the top, first face 18, the bottom, second face 19 of the insulating plate 15 lies against the top second face 32 of the feedthrough 1.
The two bottom ends 4 b and 5 b of the pins 4 and 5 that are remote from their first ends 4 a and 5 a facing towards the pyrotechnic charge 22, 23 are for electrical connection with the outside, enabling an electrical signal to be sent to heat the element 21, thereby igniting the pyrotechnic charges 22 and 23.
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