Electrical connection through a substrate to a microelectromechanical device
First Claim
1. Microelectromechanical system (MEMS) circuitry including an electrical connection through a substrate, said circuitry comprising:
- a substrate comprising first and second mutually opposite surfaces separated by a distance;
an electrical bus disposed on the first surface of the substrate; and
a via arranged to pass through the substrate from the bus to the second surface of the substrate;
wherein the via is at least partly filled with an electrically conductive material, and the via is configured to define an interlock positioned closer to the first surface of the substrate than to the second surface to reduce thermally-induced expansion of the electrically conductive material towards the surface where the electrical bus is disposed, thereby avoiding damage to the bus.
1 Assignment
0 Petitions
Accused Products
Abstract
An electrical through-connection, or via, that passes through a substrate to a bus on a first surface of the substrate. The via may be configured with an interlock such that the electrically conductive core of the via is constrained to thermally expand towards the second surface, away from the bus, thus preventing damage to the bus. The interlock may be a local constriction or enlargement of the via near the first surface of the substrate. The via may be greater in length along the bus than a unit spacing of beams in a parallel microswitch array actuated in unison along the bus. The via may be narrower in width than in length, and may form a trapezoidal geometry that is larger at the second surface of the substrate than at the first surface.
23 Citations
19 Claims
-
1. Microelectromechanical system (MEMS) circuitry including an electrical connection through a substrate, said circuitry comprising:
-
a substrate comprising first and second mutually opposite surfaces separated by a distance; an electrical bus disposed on the first surface of the substrate; and a via arranged to pass through the substrate from the bus to the second surface of the substrate; wherein the via is at least partly filled with an electrically conductive material, and the via is configured to define an interlock positioned closer to the first surface of the substrate than to the second surface to reduce thermally-induced expansion of the electrically conductive material towards the surface where the electrical bus is disposed, thereby avoiding damage to the bus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. Microelectromechanical system (MEMS) switching circuitry including an electrical connection through a substrate, said switching circuitry comprising:
-
a substrate comprising a thickness and first and second mutually opposite surfaces; an electrical bus mounted on the first surface of the substrate; and a via arranged to pass through the substrate from the bus to the second surface of the substrate, the via comprising a trench through the substrate at least partly filled with an electrical conductor; wherein the bus anchors, contacts, or actuates a plurality of microswitch beams in unison along a length of the bus, and the via comprises a longitudinal dimension substantially aligned with the length of the bus. - View Dependent Claims (12, 13, 14, 15, 16)
-
-
17. Microelectromechanical system (MEMS) switching circuitry including an electrical connection through a substrate, said switching circuitry comprising:
-
an electrical bus mounted on a first surface of the substrate; and a via passing through the substrate from the bus to a second surface of the substrate, the via comprising a trench through the substrate at least partly filled with an electrical conductor, the trench and the conductor therein formed with a geometry that blocks the conductor from expanding toward the bus; wherein the bus anchors, actuates, or contacts a plurality of microswitch beams along a length of the bus, and the via comprises a longitudinal dimension substantially aligned with the length of the bus, the longitudinal dimension of the via being greater than a unit spacing of the beams along the length of the bus.
-
-
18. An electrical connection through a substrate comprising:
-
a substrate comprising a first surface and a second surface opposed to the first surface; and a via passing through the substrate from the first surface to the second surface, and configured with an interlock positioned closer to one of the first and second surfaces of the substrate where an electrical bus is disposed such that an electrical conductor disposed within the via is constrained from extruding towards said one of the surfaces where the bus is disposed. - View Dependent Claims (19)
-
Specification