Piezo-electricity generation device

A signal generator, including a piezo-electricity generation device having a rectifying means for rectifying an AC voltage generated by free-vibration of at least one piezo-electric plate and an accumulating means for accumulating therein an electric charge outputted through said rectifying means, comprising:

• means, powered only by the piezo-electricity generation device, for setting a prespecified time period and releasing the electric charge accumulated in the accumulating means when the accumulated electric charge exceeds a preset voltage for the prespecified time period;
• and
• a signal output means, powered only by the piezo-electricity generation device, for receiving substantially all of the electric charge accumulated in said accumulating means after the accumulated electric charge exceeds the present voltage for the prespecified time period and applying only the received charge to generate a signal.

A signal generator, including a piezo-electric generation device having a rectifying means for rectifying voltage generated by free-vibration of at least one piezo-electric plate and an accumulation means for accumulating therein an electric charge outputted through said rectifying means, located on a small animal for transmitting a signal to determine the location and identity of the small animal, comprising:

• a voltage setting means, powered only by the piezo-electricity generation device, for setting a prespecified voltage and generating a signal when the electric charge accumulated in the accumulating means exceeds the prespecified voltage;
• and
• a signal output means, powered only by the piezo-electricity generation device, for receiving substantially all of the electric charge accumulated in said accumulating means when an output voltage of said accumulating means exceeds the prespecified voltage set by said voltage setting means and applying only the received charge to generate the signal.