Patent ID: 7504275
Filing Date: 2009-03-17
Classification: H02N

Abstract:
1. A method for forming a SDA-based micro motor comprising the steps of: a. depositing a first layer of silicon nitride insulator material on or over an ultra low resistivity silicon substrate, the silicon nitride insulator having a little tensile stress and a low friction coefficient; b. photolithographically patterning the layer of low stress nitride insulating material to form at least one electrical contact window of the low resistivity silicon substrate; c. depositing the second layer of material on or above the nitride deposited silicon substrate, which is an in-situ doped polysilicon material having a very low stress; d. photolithographically patterning the 1 e. depositing the third layer of material on or above the substrate, which is a phosphosilicate (PSG) material having a low stress gradient and acts as a sacrificial layer of the structural layer of the SDA micro motor; f. photolithographically patterning the 1 g. depositing the fourth layer on or over the 1 h. photolithographically patterning the 2 i. depositing the fifth layer of material on or over the rib and a portion of the 1 j. photolithographically patterning the 2 k. photolithographically patterning the 1 l. depositing the sixth layer of material on or over a portion of the rib and a portion of the 2 m. photolithographically patterning the 3 n. depositing the seventh layer of material on or over the 3 o. photolithographically patterning the chromium and gold metal layers to define the biasing and ground pads of the SDA micro motor; p. under-cut etching the 1