Microsystem switches
First Claim
1. A microsystem switch comprising:
- a support defining a recess;
a flexible bridge mounted on the support and bridging the recess, the bridge being shaped so as to hold selectively a concave stable state, in which the bridge bulges into the recess, and a convex stable state in which the bridge bulges out of the recess;
an actuator for effecting flexing of the bridge out of each of the stable states into the other of the stable states; and
a switching element mounted on the bridge such that movement of the bridge between the stable states moves the switching element between an on position and an off position;
wherein the bridge comprises a flexible membrane and wherein the actuator comprises a pair of bimorph actuation layers, each bimorph actuation layer extending over a respective portion of the bridge to form therewith a bimorph structure such that differential expansion in the bimorph structure on activation of the bimorph actuation layer exerts a force causing flexing of the bridge out of one stable state into the other stable state, the arrangement being such that activation of one of said layers causes flexing of the bridge out of the convex stable state into the concave stable state, and activation of the other layer causes flexing of the bridge out of the concave stable state into the convex stable state.
1 Assignment
0 Petitions
Accused Products
Abstract
A microsystem switch (1, 20, 25, 30, 33) has a support (2) defining a recess (3), and a flexible bridge (6) is mounted on the support (2) bridging the recess (3). The bridge (6) is shaped so as to hold selectively a concave stable state, in which the bridge bulges into the recess (3), and a convex stable state in which the bridge bulges out of the recess (3). The switch includes an actuator (8, 9; 26, 27) for effecting flexing of the bridge (6) between the stable states, and a switching element (7, 31, 34) is mounted on the bridge (6) such that movement of the bridge between the stable states moves the switching element between an on position and an off position. According to another design, a microsystem switch (40, 55) has a support (41) defining a recess (42), and an elongate torsion member (44) is mounted on the support (41) bridging the recess (42). A flexible bridge (43, 56) is mounted on the support (41) bridging the recess (42) in a direction substantially perpendicular to the torsion member (44). The bridge (43, 56) is connected to the torsion member (44) at the cross-point thereof so that a first section of the bridge extends between the cross-point and one side of the recess (42) and a second section of the bridge extends between the cross-point and the opposite side of the recess (42). The bridge (43, 56) is shaped so as to hold selectively a first stable state, in which the first section of the bridge bulges into the recess and the second section of the bridge bulges out of the recess, and a second stable state in which this configuration is reversed. A switching element (45) is mounted at the cross-point of the bridge (43, 56) and torsion member (44), and an actuator (46a, 46b; 58a, 58b) is again provided for effecting flexing of the bridge (43, 56) between the stable states. Here, movement of the bridge (43, 56) between the stable states effects twisting of the torsion member (44) and rotation of the switching element (45) between an on position and an off position. Switching devices incorporating these switches, and switching apparatus comprising arrays of such switching devices, are also provided.
11 Citations
25 Claims
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1. A microsystem switch comprising:
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a support defining a recess; a flexible bridge mounted on the support and bridging the recess, the bridge being shaped so as to hold selectively a concave stable state, in which the bridge bulges into the recess, and a convex stable state in which the bridge bulges out of the recess; an actuator for effecting flexing of the bridge out of each of the stable states into the other of the stable states; and a switching element mounted on the bridge such that movement of the bridge between the stable states moves the switching element between an on position and an off position; wherein the bridge comprises a flexible membrane and wherein the actuator comprises a pair of bimorph actuation layers, each bimorph actuation layer extending over a respective portion of the bridge to form therewith a bimorph structure such that differential expansion in the bimorph structure on activation of the bimorph actuation layer exerts a force causing flexing of the bridge out of one stable state into the other stable state, the arrangement being such that activation of one of said layers causes flexing of the bridge out of the convex stable state into the concave stable state, and activation of the other layer causes flexing of the bridge out of the concave stable state into the convex stable state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A microsystem switch comprising:
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a support (41) defining a recess; an elongate torsion member mounted on the support and bridging the recess; a flexible bridge mounted on the support and bridging the recess in a direction substantially perpendicular to the torsion member, the bridge being connected to the torsion member at the cross-point thereof so that a first section of the bridge extends between the cross-point and one side of the recess and a second section of the bridge extends between the cross-point and the opposite side of the recess, wherein the bridge is shaped so as to hold selectively a first stable state, in which the first section of the bridge bulges into the recess and the second section of the bridge bulges out of the recess, and a second stable state in which the first section of the bridge bulges out of the recess and the second section of the bridge bulges into the recess; an actuator for effecting flexing of the bridge out of each of the stable states into the other of the stable states; and a switching element mounted at the cross-point of the bridge and torsion member; wherein movement of the bridge between the stable states effects twisting of the torsion member and rotation of the switching element between an on position and an off position. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification