Patent ID: 7241966
Filing Date: 2007-07-10
Classification: H01L,H03H

Abstract:
1. A method for fabricating wafer level packages, the method comprising the following steps of: (a) preparing a device wafer having a micro-drive unit arranged in a plurality of package areas, respectively and an enclosed metal strip arranged along a periphery of the package area spaced from the drive unit; (b) preparing a lid wafer made of a transparent material and having an enclosed metal strip formed thereon matching the metal strip on the device wafer; (c) mounting the device wafer on a support member with the metal strip facing upward, and mounting the transparent lid wafer on the device wafer with the metal strip of the lid wafer butting on the metal strip of the device wafer; (d) illuminating a laser beam from a laser source onto an entire area of at least one of the package areas through the lid wafer to weld the metal strips together so as to seal an internal space defined by the metal strips between the wafers, wherein the laser beam has a size larger than that of the at least one of the package areas; and (e) cutting a resultant structure along an outer periphery of a resultant welded metal strip, wherein the illumination step (d) comprises illuminating the laser beam for about 0.01 to 10 seconds so as to weld the metal strips together without thermal effect on the drive unit.