| 摘要 |
A semiconductor physical quantity sensor includes a substrate, a beam-structure movable portion and a fixed portion. The beam-structure movable portion is suspended by four anchors formed of polycrystalline films. A rectangular mass is suspended between beams. Movable electrodes project from both sides of the mass. First fixed electrodes and second fixed electrodes are fixedly provided on the surface of the substrate. The substrate has a laminated structure, wherein an oxide film, attaching film, insulating films, conductive film and insulating film are laminated on the substrate. An anchor formed from the conductive film is electrically connected to the attaching film. An electrode pad made of an aluminum film is provided the above the anchor. Because this structure enables the potential of the attaching film to be fixed, parasitic capacitance can be decreased.
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