US Patent 7028547 Body motion detector

A movement detecting device comprises a container (10), at least a first vibrator (16) which vibrates in accordance with a physical movement in a first direction (X), and a second vibrator (17) which vibrates about a second direction (Z), the first and second vibrators mounted in the container. The vibrations of the first and second vibrators are converted into an electric signal, and a value of the converted signal is shown on a display.