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Methods and apparatus to increase sound quality of piezoelectric devices
| Details |
Inventors: Woodard, Stanley E.; Fox, Robert L.; Bryant, Robert G.;
Assignee: Woodard; Stanley E. (Hampton, VA)
Primary Examiner: Lee; Benjamin C.
Assistant Examiner:
Attorney, Agent or Firm:
A piezoelectric transducer comprises a piezoelectric component, an acoustic member attached to one of the surfaces of the piezoelectric component and a dampening material of low elastic modulus attached to one or both surfaces of the piezoelectric transducer. The piezoelectric component may comprise either an unimorph or a bimorph structure including a piezoceramic wafer made of lead zirconate titanate and a layer of dampening material sandwiched between the piezoelectric component and the acoustic member. The acoustic member comprises a surrounding wall portion and an end portion which form an acoustic chamber when the member is mounted on a surface of the piezoelectrie component. The end portion has an orifice to form a passageway from the chamber through the end portion to the outside of the member. |
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DETAILED DESCRIPTION Accordingly, an object and advantage of the present invention is to provide a vibrating piezoelectric transducer for a personal communication device that is easily manufactured, requires a small amount of power to operate, and provides the desired amount of vibration for transmitting vibrational and acoustic signals.
According to the present invention, the foregoing and other objects and advantages are attained by providing a personal communication device comprising a housing, a receiver component, a processor and a multi-functional piezoelectric transducer.
The receiver component is mounted within the housing and receives signals transmitted to the device.
The processor is also mounted within the housing and is operatively coupled to the receiver component.
The processor processes signals received by the receiver component and sends electrical signals to the multi-functional piezoelectric transducer.
The piezoelectric transducer is also mounted within the housing and is electrically connected to the processor.
The piezoelectric transducer produces mechanical vibrations in response to the electrical signals transmitted by the processor.
These mechanical vibrations, which are over a broad range of frequencies, are of a force sufficient to generate a tactile alert at a predetermined first frequency, to generate an audible alert at frequencies within a second predetermined range, and to generate audible sound over the audible frequency range.
These vibrations also produce a substantially flat audio response over the audible frequency range.
In an alternate embodiment, the personal communication device further comprises an audible alerting component, such as a speaker.
The audible alerting component is operatively connected to the processor or to the control switch and is located within the housing.
The audible alerting component vibrates at frequencies within a predetermined range so as to produce an audible, alerting sound to a user of the device.
Under this embodiment, the multi-functional piezoelectric transducer still has the capability of producing an audible alert
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Ring Tones 
