A MEMS apparatus having a substrate layer, a device layer and an intermediate oxide layer joining them. A slider is formed in the device layer and includes an enlarged end portion. A walled chamber having a hollow interior in which is positioned a microdetonator is formed in the substrate layer beneath the enlarged end portion and is secured to it by the oxide layer. A drive is operable to move the slider, and with it, the walled chamber, from an initial position to a final position. When in the final position an initiator is operable to initiate the microdetonator. |
Citations|
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TRW Inc. | Air bag inflator with mechanism for deactivation of second stage and autoignition | | US6584911 | Apr 26, 2001 | Jul 1, 2003 | TRW Inc. | Initiators for air bag inflators | | US6640719 | Jan 18, 2002 | Nov 4, 2003 | The United States of America as represented by the Secretary of the Army | Fuze explosive train device and method | | US6964231 | Mar 6, 2003 | Nov 15, 2005 | The United States of America as represented by the Secretary of the Army | Miniature MEMS-based electro-mechanical safety and arming device | | US6986307 | Sep 2, 2003 | Jan 17, 2006 | Robert Bosch GmbH | Bridge-type igniter ignition element | | US7051656 | Aug 14, 2003 | May 30, 2006 | Sandia Corporation | Microelectromechanical safing and arming apparatus | | US7383774 | Mar 22, 2006 | Jun 10, 2008 | Sandia Corporation | Microelectromechanical safing and arming apparatus | | US20050183609 | Jan 27, 2004 | | | Micromechanical latching switch | | US20060070547 | Mar 5, 2004 | | | Electronic safety and arming unit | | US20060236887 | Feb 6, 2006 | | | Delay units and methods of making the same |
Claims1. A MEMS microdetonator/initiator apparatus for a MEMS fuze, comprising: - a bottom substrate layer, a top device layer and an intermediate oxide layer joining said top and bottom layers;
- a slider defined in said top device layer with said slider including an enlarged end portion, wherein said slider comprises a portion adjacent said end portion devoid of any underlying said intermediate oxide layer so as to permit movement thereof relative to said bottom substrate layer;
- a slider drive operable to move said slider from an initial position to a final position;
- a walled chamber being defined in said bottom substrate layer where said walled chamber is connected to said enlarged end portion of said slider by said intermediate oxide layer,
- wherein said bottom substrate layer, which is adjacent said walled chamber, is removed to allow movement of said walled chamber, and
- wherein said walled chamber comprises a hollow interior extending to an underside of said enlarged end portion;
- a microdetonator being positioned within said hollow interior of said walled chamber,
- wherein said bottom substrate layer includes a void adjacent said walled chamber to allow movement of said walled chamber into said void when said slider is moved by said drive to said final position; and
- an initiator being positioned so that when said slider is in said final position, said initiator, when supplied with voltage, is operable to initiate said microdetonator.
2. The apparatus according to claim 1, wherein said slider includes a relatively thin portion and an enlarged end portion. 3. The apparatus according to claim 1, wherein said walled chamber comprises four walls. 4. The apparatus according to claim 1, wherein said initiator comprises two initiator arms connected by a relatively thin section of conductor at the ends thereof, and - wherein when said initiator is supplied with voltage said relatively thin section of conductor is heated to a degree sufficient to initiate said microdetonator.
5. The apparatus according to claim 1, further comprising a base layer, said base layer comprises a top surface and a bottom surface, - wherein said bottom substrate layer comprises an undersurface bonded to said top surface.
6. The apparatus according to claim 5, wherein said base layer includes a first cavity formed from said top surface and extends into said base layer, and - wherein said first cavity is positioned below said microdetonator when said slider is in said initial position.
7. The apparatus according to claim 5, wherein said base layer includes a second cavity formed from said bottom surface and extends into said base layer to a depth so as to leave a thin membrane at said top surface, and - wherein said thin membrane is positioned below said void.
8. The apparatus according to claim 4, wherein said slider comprises an enlarged portion, said enlarged end portion includes a slot, and - wherein said two parallel initiator arms are positioned within said slot when said slider is in said final position.
9. The apparatus according to claim 1, wherein said initiator includes a first initiator arm and a second initiator arm with an open gap at ends of said first initiator arm and said second initiator arm, and - wherein said initiator is supplied with a voltage so that a spark is generated at said open gap to initiate said microdetonator.
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