Piezoelectric laminate motion sensing apparatus and method

A portable device having a sensor apparatus for sensing free-fall motion comprising:

• the said portable device
• a one-dimensional sensor structure functioning as said sensor apparatus having high low-frequency sensitivity to detect the gravity change as said portable device starts to free-fall;
• a piezoelectric laminate distributed on said one-dimensional sensor structure;
• a pair of electrodes disposed on said piezoelectric laminate;
• a frequency selector, coupled to said electrodes and piezoelectric laminate and having frequency selectivity to selecting the signal generated as a result of said free-fall signals;
• an electrical circuit, coupled to said frequency selector, for processing electrical signals from said frequency selector;
• and
• an activating device, coupled to said electrical circuit, for activation in response to the electrical signals.
• a protection mechanism, driven by said activating device, for protecting said portable device from damage.