Patent ID: 7687375

Claim:
A lamination device manufacturing method for manufacturing a lamination device using a reinforced wafer, in which the reinforced wafer is sectioned into a plurality of areas by streets arranged on a front surface in a lattice pattern and includes a device area formed with devices in the areas thus sectioned and an outer circumferential redundant area surrounding the device area, an area of an rear surface corresponding to the device area is ground so that the device area may be formed to have a predetermined thickness and an area corresponding to the outer circumferential redundant area may be left to form an annular reinforced portion, the method comprising: a wafer lamination step in which an underlying wafer having a diameter slightly smaller than an inside diameter of the annular reinforced portion of the reinforced wafer and formed on a front surface with a plurality of streets and of devices corresponding respectively to a plurality of streets and of devices formed in the device area of the reinforced wafer is prepared, and a rear surface of the reinforced wafer corresponding to the device area is faced to and joined to the front surface of the underlying wafer with corresponding streets aligned with each other, thus forming a lamination wafer; an electrode connection step in which a via-hole is formed at a position where an electrode is formed in each of the devices of the reinforced wafer constituting part of the lamination wafer, so as to reach a corresponding electrode formed in each of the devices of the underlying wafer, and the via-hole is filled with a conductive material to connect the electrodes; and a division step in which after the electrode connection step is executed, the lamination wafer is cut along the streets and divided into individual lamination devices.