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    • 5. 发明专利
    • DE102005033440A1
    • 2006-03-16
    • DE102005033440
    • 2005-07-18
    • DENSO CORP
    • TANAKA HIROAKITOMISAKA MANABU
    • G01L9/06G01L19/06
    • A pressure sensor includes a semiconductor substrate having a diaphragm in which an electrical circuit including a gauge resistance is formed, an insulation film provided on a surface of the semiconductor substrate, an Al film provided on the insulation film and electrically connected to the electrical circuit through a conductor hole of the insulation film, an Au film provided on the Al film through a Ti film, a first protective film which covers the Al film and has an opening portion from which a portion of the Au film is exposed. In the pressure sensor, a second protective film made of polyimideamide or polyimide covers at least the surface of the Au film exposed from the first protective film, and a vicinity of the opening portion of the first protective film. Therefore, corrosion resistance of the Al film can be prevented while the pressure sensor has a reduced component number.