Hermetically packaged MEMS G-switch
First Claim
1. A hermetically packaged MEMS G-switch, comprising:
- a MEMS structure comprising a bottom substrate layer, a top device layer and an intermediate oxide layer joining said bottom substrate and top device layers;
at least one anchor portion being defined in said top device layer;
a mass disposed in said top device layer, said mass is moveable cut of a plane of said top device layer where said mass includes a conductive pad on a top portion thereof;
at least one spring arm comprising a first end connected to said mass and a second end connected to said anchor portion, a connection of said at least one spring arm to said anchor portion where the connection includes a T shaped arrangement having a torsional spring cross piece connected to said second end of said spring arm to provide for greater flexibility of said mass and said spring arm; and
a cap hermetically sealed to said MEMS structure where the cap includes a conductive pad,wherein said conductive pad of said mass engages said conductive pad of said cap when a predetermined acceleration of a G-switch is attained, andwherein said mass includes a first contact arm and a second contact arm both extending from a back of said mass and parallel to sides of said mass,wherein said first contact arm includes a first contact point and said second contact arm includes a second contact point where each of said first contact point and said second contact point is situated at ends of respective said first contact arm and said second contact arm thereof that extend past an end of said mass, andwherein said first contact point and said second contact point engage said conductive pad of said cap prior to said mass, during closing of said G-switch.
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Accused Products
Abstract
A hermetically packaged G-switch includes a MEMS structure having a bottom substrate layer, a top device layer and an intermediate oxide layer. A mass disposed in the top device layer is connected to one, two or three anchor portions using spring arms. One end of a spring arm is connected to the mass and another end to an anchor portion. The connection to the anchor portion includes a T shaped arrangement, which has a torsional spring cross piece connected to the spring arm. A cap containing a conductive pad is hermetically sealed to the MEMS structure. When a predetermined acceleration is attained, the mass makes electrical contact with the conductive pad to close the G-switch.
18 Citations
11 Claims
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1. A hermetically packaged MEMS G-switch, comprising:
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a MEMS structure comprising a bottom substrate layer, a top device layer and an intermediate oxide layer joining said bottom substrate and top device layers; at least one anchor portion being defined in said top device layer; a mass disposed in said top device layer, said mass is moveable cut of a plane of said top device layer where said mass includes a conductive pad on a top portion thereof; at least one spring arm comprising a first end connected to said mass and a second end connected to said anchor portion, a connection of said at least one spring arm to said anchor portion where the connection includes a T shaped arrangement having a torsional spring cross piece connected to said second end of said spring arm to provide for greater flexibility of said mass and said spring arm; and a cap hermetically sealed to said MEMS structure where the cap includes a conductive pad, wherein said conductive pad of said mass engages said conductive pad of said cap when a predetermined acceleration of a G-switch is attained, and wherein said mass includes a first contact arm and a second contact arm both extending from a back of said mass and parallel to sides of said mass, wherein said first contact arm includes a first contact point and said second contact arm includes a second contact point where each of said first contact point and said second contact point is situated at ends of respective said first contact arm and said second contact arm thereof that extend past an end of said mass, and wherein said first contact point and said second contact point engage said conductive pad of said cap prior to said mass, during closing of said G-switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification