Patent ID: 7838320

Claim:
A method for manufacturing a semiconductor physical quantity sensor having a fixed portion, a movable portion and a first output terminal, wherein the fixed portion includes a fixed electrode and a fixed wiring, the movable portion includes a movable electrode facing the fixed electrode, the first output terminal is disposed on the fixed wiring, and the sensor detects a physical quantity based on a capacitance between the movable electrode and the fixed electrode, the method comprising: forming a metal layer on a semiconductor layer; forming a resist on the metal layer; patterning the resist to have a first opening for the fixed portion and to have a first side etching hole, wherein the first side etching hole is arranged in a region of the resist surrounded with the first opening of the resist; anisotropically etching the metal layer exposed via the first opening and the first side etching hole; anisotropically etching the semiconductor layer exposed via the first opening so that the fixed portion is formed in the semiconductor layer; and side etching the metal layer from the first opening and the first side etching hole as a starting point so that the output terminal is formed on a part of the fixed wiring, and a first metal member is formed on another part of the fixed wiring in such a manner that the first metal member is electrically separated from the first output terminal.