Method and apparatus for packaging circuit devices
First Claim
Patent Images
1. A method comprising:
- providing a wafer comprising a first side and a second side;
forming an opening through the wafer, the opening extending from the first side to the second side;
oxidizing the wafer;
forming a via in the opening, the forming comprising;
sputtering a first metal material onto the first and second sides and into the opening so as to completely cover surfaces within the opening;
sputtering a second metal material onto the first and second sides into the opening so as to completely cover the first metal material within the opening;
forming a glass material within the opening after the sputtering of the second metal material, the glass material forming a hermetic seal between the first and second sides of the wafer;
forming a first annular flange around the opening on the first side of the wafer, and a second annular flange around the opening on the second side of the wafer, the annular flanges comprising the first and second metal materials;
forming a micro-electro-mechanical system (MEMS) on the first side of the wafer;
forming a lid by creating a recess in a sheet of glass material; and
anodically bonding the lid to the first side of the wafer in order to form a hermetic seal between the lid and wafer, the lid being aligned so that the MEMS and the via is disposed within the recess of the lid;
wherein the bonding the lid to the wafer occurs in an atmosphere of an inert gas so that the MEMS is hermetically sealed under the lid in the inert gas.
5 Assignments
0 Petitions
Accused Products
Abstract
A hermetically sealed package includes a lid (14) hermetically bonded to a wafer or substrate (12), with a chamber therebetween defined by a recess (16) in the lid. A circuit device (26) such as MEMS device is provided within the chamber on the substrate. A plurality of vias (41-46) are provided through the substrate, and each have a structure which facilitates a hermetic seal of a suitable level between opposite sides of the substrate. The vias provide electrical communication from externally of the assembly to the device disposed in the chamber.
21 Citations
11 Claims
-
1. A method comprising:
-
providing a wafer comprising a first side and a second side; forming an opening through the wafer, the opening extending from the first side to the second side; oxidizing the wafer; forming a via in the opening, the forming comprising; sputtering a first metal material onto the first and second sides and into the opening so as to completely cover surfaces within the opening; sputtering a second metal material onto the first and second sides into the opening so as to completely cover the first metal material within the opening; forming a glass material within the opening after the sputtering of the second metal material, the glass material forming a hermetic seal between the first and second sides of the wafer; forming a first annular flange around the opening on the first side of the wafer, and a second annular flange around the opening on the second side of the wafer, the annular flanges comprising the first and second metal materials; forming a micro-electro-mechanical system (MEMS) on the first side of the wafer; forming a lid by creating a recess in a sheet of glass material; and anodically bonding the lid to the first side of the wafer in order to form a hermetic seal between the lid and wafer, the lid being aligned so that the MEMS and the via is disposed within the recess of the lid; wherein the bonding the lid to the wafer occurs in an atmosphere of an inert gas so that the MEMS is hermetically sealed under the lid in the inert gas. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method of forming a via comprising:
-
forming an opening through a wafer; oxidizing the wafer; sputtering a first metal material onto the first and second sides and into the opening so as to completely cover surfaces within the opening; sputtering a second metal material onto the first and second sides into the opening so as to completely cover the first metal material within the opening; forming a glass material within the opening after the sputtering of the second metal material, the glass material forming a hermetic seal between the first and second sides of the wafer; and forming a first annular flange around the opening on the first side of the wafer, and a second annular flange around the opening on the second side of the wafer, the annular flanges comprising the first and second metal materials. - View Dependent Claims (9, 10, 11)
-
Specification