Patent ID: 8359758

Claim:
A three-dimensional inclination angle calculation circuit, comprising: X-axis, Y-axis, and Z-axis vibration sensors configured to provide X-axis, Y-axis, and Z-axis electrostatic capacitances according to three-dimensional positions of a measured plane with respect to a reference plane, respectively; X-axis, Y-axis, and Z-axis position value acquisition units configured to acquire X-axis, Y-axis, and Z-axis position values corresponding to the X-axis, Y-axis, and Z-axis electrostatic capacitances, respectively; and an inclination angle calculation unit configured to calculate an inclination angle of the measured plane with respect to the reference plane based on the X-axis, Y-axis, and Z-axis position values, wherein each of the X-axis, Y-axis, and Z-axis position value acquisition units comprises: an ROIC (read-out IC) configured to generate a signal having a signal value corresponding to the electrostatic capacitance acquired by the corresponding vibration sensor, wherein the ROIC includes an SCA (switched capacitor amplifier) having a negative terminal to which two electrostatic capacitances obtained by the corresponding vibration sensor are connected parallel to each other and to which a capacitance for feedback of an output signal thereof and a reset switch are connected parallel to each other and a positive terminal connected to a ground; and a low pass filter configured to filter a high frequency component of the signal generated by the ROIC to acquire the position value.