Inertial sensor and electrical or electronic device

An electrical or electronic device comprising:

• an inertial sensor that measures an angular velocity or an acceleration caused by the motion of the electrical or electronic device,
• wherein,
• the inertial sensor includes (a) an oscillator that is supported by an elastic supporting member such that the oscillator is floating relative to a base and the oscillator is displaceable along a single axis, and (b) a displacement detection unit that detects a displacement of the oscillator,
• an oscillation of the oscillator is a simple harmonic motion along a Z axis,
• an X axis, a Y axis, and the Z axis of a rectangular coordinate system, serving as reference axes of an oscillation coordinate system for the oscillator, are shifted to provide an x axis, a y axis, and a z axis, serving as reference axes of a new oscillation coordinate system,
• position coordinates of the oscillator of the x, y, and z axes are determined at least two points during one period of the oscillator,
• a difference vector (Δx, Δy, Δz) is calculated on the basis of the position coordinates of the x, y, and z axes determined at the two points, and
• an angular velocity or an acceleration is obtained using the difference vector.