Haptic devices having multiple operational modes including at least one resonant mode

A method of outputting haptic effects from an electronic device, the method comprising:

• applying a drive signal at a predetermined drive frequency to at least one electro-mechanical transducer of a plurality of electro-mechanical transducers coupled to a base in a housing, wherein each electro-mechanical transducer comprises an electro-mechanical device coupled to the base, and wherein each electro-mechanical transducer is configured to operate at a respective resonant mode;
• and
• outputting a haptic effect from the at least one electro-mechanical transducer,
• wherein each electro-mechanical device of the plurality further comprises a piezoelectric bar having a mass coupled thereto, the mass of each electro-mechanical device located a predetermined distance from the base.

An electronic device comprising:

• a housing;
• a base coupled to the housing;
• and
• an electro-mechanical transducer coupled to the base, the electro-mechanical transducer configured to operate in a resonant mode and output a haptic effect upon receiving a drive signal at a predetermined drive frequency, wherein the electro-mechanical transducer comprises a piezoelectric bar and a mass coupled to the piezoelectric bar.

An electronic device comprising:

• a housing;
• a base coupled to the housing;
• and
• an electro-mechanical transducer coupled to the base, the electro-mechanical transducer configured to operate in a resonant mode and output a haptic effect upon receiving a drive signal at a predetermined drive frequency,
• wherein the electro-mechanical transducer further comprises a plurality of spaced apart electro-mechanical devices coupled thereto in a serial fashion between a first end proximal to the base and a second end distal to the base.