Driving circuit, electro-mechanical-acoustic transducer, and portable terminal apparatus

A driving circuit for driving a vibrator having a mechanical vibration system which resonates at a resonance frequency, wherein:

• the driving circuit outputs to the vibrator at least two signals of different frequencies which are included in a frequency range including the resonance frequency;
• and
• the vibrator has a function of converting an electric signal into at least one of a sound and a vibration;
• the at least two signals include a first signal and a second signal;
• the driving circuit outputs to the vibrator a synthesized signal obtained by adding together the first signal and the second signal;
• and
• wherein the synthesized signal is a sine wave signal which is obtained by synthesizing together a plurality of groups of frequency signals, each group including a first pair of adjacent frequency signals and a second pair of adjacent frequency signals, the first pair of adjacent frequency signals being synthesized together in reverse phase, and the second pair of adjacent frequency signals being synthesized together in phase.

A driving circuit for driving a vibrator having a mechanical vibration system having predetermined vibration force vs frequency characteristics, wherein:

• the mechanical vibration system has different vibration force vs frequency characteristics for an increasing frequency sweep and for a decreasing frequency sweep within a predetermined frequency range;
• the predetermined frequency range is defined between a lower limit frequency which represents a lowest frequency in the predetermined frequency range and an upper limit frequency which represents a highest frequency in the predetermined frequency range;
• the driving circuit outputs to the vibrator a first signal having a frequency within the frequency range and a second signal having a frequency which is lower than the lower limit frequency;
• the second signal is output to the vibrator concurrently with or prior to the first signal;
• the vibrator has a function of converting an electric signal into at least one of a sound and a vibration;
• and
• the first and second signals, having frequencies near the resonance frequency that are different from one another, produce the vibration of the vibrator.

A driving circuit for driving a vibrator having a mechanical vibration system having predetermined vibration force vs frequency characteristics, wherein:

• the mechanical vibration system has different vibration force vs frequency characteristics for an increasing frequency sweep and for a decreasing frequency sweep within a predetermined frequency range;
• the predetermined frequency range is defined between a lower limit frequency which represents a lowest frequency in the predetermined frequency range and an upper limit frequency which represents a highest frequency in the predetermined frequency range;
• the driving circuit outputs to the vibrator a first signal having a frequency within the frequency range and a second signal having a frequency which is lower than the lower limit frequency;
• the second signal is output to the vibrator concurrently with or prior to the first signal;
• the vibrator has a function of converting an electric signal into at least one of a sound and a vibration;
• the first signal includes a swept frequency signal whose frequency continuously varies over time;
• the first signal has a first turning frequency at which the frequency of the first signal stops increasing and starts decreasing and a second turning frequency at which the frequency of the first signal stops decreasing and starts increasing;
• the first turning frequency is lower than the upper limit frequency;
• and
• the second turning frequency is higher than the lower limit frequency.

A driving circuit for driving a vibrator having a mechanical vibration system having predetermined vibration force vs frequency characteristics, wherein:

• the mechanical vibration system has different vibration force vs frequency characteristics for an increasing frequency sweep and for a decreasing frequency sweep within a predetermined frequency range;
• the predetermined frequency range is defined between a lower limit frequency which represents a lowest frequency in the predetermined frequency range and an upper limit frequency which represents a highest frequency in the predetermined frequency range;
• the driving circuit outputs to the vibrator a first signal having a frequency within the frequency range and a second signal having a frequency which is lower than the lower limit frequency;
• the second signal is output to the vibrator concurrently with or prior to the first signal;
• the vibrator has a function of converting an electric signal into at least one of a sound and a vibration;
• the driving circuit outputs to the vibrator a synthesized signal obtained by adding together the first signal and the second signal while shifting a phase of the first signal and a phase of the second signal from each other;
• and
• the synthesized signal is a sine wave signal which is obtained by synthesizing together a plurality of groups of frequency signals, each group including a first pair of adjacent frequency signals and a second pair of adjacent frequency signals, the first pair of adjacent frequency signals being synthesized together in reverse phase, and the second pair of adjacent frequency signals being synthesized together in phase.

An electro-mechanical-acoustic transducer, comprising:

• a vibrator having a mechanical vibration system which resonates at a resonance frequency;
• and
• a driving circuit for driving the vibrator, wherein:
• the driving circuit outputs to the vibrator a plurality of signals of different frequencies which are included in a frequency range including the resonance frequency, and
• at least two of the plurality of signals, having frequencies near the resonance frequency that are different from one another, are output concurrently to produce the vibration of the vibrator.

An electro-mechanical-acoustic transducer, comprising:

• a vibrator having a mechanical vibration system having predetermined vibration force vs frequency characteristics;
• and
• a driving circuit for driving the vibrator, wherein:
• the mechanical vibration system has different vibration force vs frequency characteristics for an increasing frequency sweep and for a decreasing frequency sweep within a predetermined frequency range;
• the predetermined frequency range is defined between a lower limit frequency which represents a lowest frequency in the predetermined frequency range and an upper limit frequency which represents a highest frequency in the predetermined frequency range;
• the driving circuit outputs to the vibrator a first signal having a frequency within the frequency range and a second signal having a frequency which is lower than the lower limit frequency;
• and
• the second signal is output to the vibrator concurrently with the first signal;
• and
• the first and second signals, having frequencies near the resonance frequency that are different from one another, produce the vibration of the vibrator.

A portable terminal apparatus, comprising:

• a vibrator having a mechanical vibration system which resonates at a resonance frequency;
• an antenna for receiving an incoming call signal;
• a reception signal processing section for processing the incoming call signal so as to output an electric signal to the vibrator;
• and
• a driving circuit for driving the vibrator, wherein:
• the driving circuit outputs to the vibrator a plurality of signals of different frequencies which are included in a frequency range including the resonance frequency, and
• at least two of the plurality of signals, having frequencies near the resonance frequency that are different from one another, are output concurrently to produce the vibration of the vibrator.

A portable terminal apparatus, comprising:

• a vibrator having a mechanical vibration system having predetermined vibration force vs frequency characteristics;
• an antenna for receiving an incoming call signal;
• a reception signal processing section for processing the incoming call signal so as to output an electric signal to the vibrator;
• and
• a driving circuit for driving the vibrator, wherein;
• the mechanical vibration system has different vibration force vs frequency characteristics for an increasing frequency sweep and for a decreasing frequency sweep within a predetermined frequency range;
• the predetermined frequency range is defined between a lower limit frequency which represents a lowest frequency in the predetermined frequency range and an upper limit frequency which represents a highest frequency in the predetermined frequency range;
• the driving circuit outputs to the vibrator a first signal having a frequency within the frequency range and a second signal having a frequency which is lower than the lower limit frequency;
• and
• the second signal is output to the vibrator concurrently with the first signal;
• and
• the first and second signals, having frequencies near the resonance frequency that are different from one another, produce the vibration of the vibrator.

An electro-mechanical-acoustic transducer, comprising:

• a vibrator having a mechanical vibration system which resonates at a resonance frequency;
• and
• a driving circuit for driving the vibrator, wherein:
• the driving circuit outputs to the vibrator at least two signals of different frequencies which are included in a frequency range including the resonance frequency;
• the at least two signals include a first signal and a second signal;
• the driving circuit outputs to the vibrator a synthesized signal obtained by adding together the first signal and the second signal;
• and
• the synthesized signal is a sine wave signal which is obtained by synthesizing together a plurality of groups of frequency signals, each group including a first pair of adjacent frequency signals and a second pair of adjacent frequency signals, the first pair of adjacent frequency signals being synthesized together in reverse phase, and the second pair of adjacent frequency signals being synthesized together in phase.

An electro-mechanical-acoustic transducer, comprising:

• a vibrator having a mechanical vibration system having predetermined vibration force vs frequency characteristics;
• and
• a driving circuit for driving the vibrator, wherein:
• the mechanical vibration system has different vibration force vs frequency characteristics for an increasing frequency sweep and for a decreasing frequency sweep within a predetermined frequency range;
• the predetermined frequency range is defined between a lower limit frequency which represents a lowest frequency in the predetermined frequency range and an upper limit frequency which represents a highest frequency in the predetermined frequency range;
• the driving circuit outputs to the vibrator a first signal having a frequency within the frequency range and a second signal having a frequency which is lower than the lower limit frequency;
• the second signal is output to the vibrator concurrently with or prior to the first signal;
• the first signal includes a swept frequency signal whose frequency continuously varies over time;
• the first signal has a first turning frequency at which the frequency of the first signal stops increasing and starts decreasing and a second turning frequency at which the frequency of the first signal stops decreasing and starts increasing;
• the first turning frequency is lower than the upper limit frequency;
• and
• the second turning frequency is higher than the lower limit frequency.

An electro-mechanical-acoustic transducer, comprising;

• a vibrator having a mechanical vibration system having predetermined vibration force vs frequency characteristics;
• and
• a driving circuit for driving the vibrator, wherein:
• the mechanical vibration system has different vibration force vs frequency characteristics for an increasing frequency sweep and for a decreasing frequency sweep within a predetermined frequency range;
• the predetermined frequency range is defined between a lower limit frequency which represents a lowest frequency in the predetermined frequency range and an upper limit frequency which represents a highest frequency in the predetermined frequency range;
• the driving circuit outputs to the vibrator a first signal having a frequency within the frequency range and a second signal having a frequency which is lower than the lower limit frequency;
• the second signal is output to the vibrator concurrently with or prior to the first signal;
• the driving circuit outputs to the vibrator a synthesized signal obtained by adding together the first signal and the second signal while shifting a phase of the first signal and a phase of the second signal from each other;
• and
• the synthesized signal is a sine wave signal which is obtained by synthesizing together a plurality of groups of frequency signals, each group including a first pair of adjacent frequency signals and a second pair of adjacent frequency signals, the first pair of adjacent frequency signals being synthesized together in reverse phase, and the second pair of adjacent frequency signals being synthesized together in phase.

A portable terminal apparatus, comprising:

• a vibrator having a mechanical vibration system which resonates at a resonance frequency;
• an antenna for receiving an incoming call signal;
• a reception signal processing section for processing the incoming call signal so as to output an electric signal to the vibrator;
• and
• a driving circuit for driving the vibrator, wherein:
• the driving circuit outputs to the vibrator at least two signals of different frequencies which are included in a frequency range including the resonance frequency;
• the at least two signals include a first signal and a second signal;
• the driving circuit outputs to the vibrator a synthesized signal obtained by adding together the first signal and the second signal;
• and
• the synthesized signal is a sine wave signal which is obtained by synthesizing together a plurality of groups of frequency signals, each group including a first pair of adjacent frequency signals and a second pair of adjacent frequency signals, the first pair of adjacent frequency signals being synthesized together in reverse phase, and the second pair of adjacent frequency signals being synthesized together in phase.

A portable terminal apparatus, comprising:

• a vibrator having a mechanical vibration system having predetermined vibration force vs frequency characteristics;
• an antenna for receiving an incoming call signal;
• a reception signal processing section for processing the incoming call signal so as to output an electric signal to the vibrator;
• and
• a driving circuit for driving, the vibrator, wherein:
• the mechanical vibration system has different vibration force vs frequency characteristics for an increasing frequency sweep and, for a decreasing frequency sweep within a predetermined frequency range;
• the predetermined frequency range is defined between a lower limit frequency which represents a lowest frequency in the predetermined frequency range and an upper limit frequency which represents a highest frequency in the predetermined frequency range;
• the driving circuit outputs to the vibrator a first signal having a frequency within the frequency range and a second signal having a frequency which is lower than the lower limit frequency;
• the second signal is output to the vibrator concurrently with or prior to the first signal;
• the first signal includes a swept frequency signal whose frequency continuously varies over time;
• the first signal has a first turning frequency at which the frequency of the first signal stops increasing and starts decreasing and a second turning frequency at which the frequency of the first signal stops decreasing and starts increasing;
• the first turning frequency is lower than the upper limit frequency;
• and
• the second turning frequency is higher than the lower limit frequency.

A portable terminal apparatus, comprising:

• a vibrator having a mechanical vibration system having predetermined vibration force vs frequency characteristics;
• an antenna for receiving an incoming call signal;
• a reception signal processing section for processing the incoming call signal so as to output an electric signal to the vibrator;
• and
• a driving circuit for driving the vibrator, wherein:
• the mechanical vibration system has different vibration force vs frequency characteristics for an increasing frequency sweep and for a decreasing frequency sweep within a predetermined frequency range;
• the predetermined frequency range is defined between a lower limit frequency which represents a lowest frequency in the predetermined frequency range and an upper limit frequency which represents a highest frequency in the predetermined frequency range;
• the driving circuit outputs to the vibrator a first signal having a frequency within the frequency range and a second signal having a frequency which is lower than the lower limit frequency;
• the second signal is output to the vibrator concurrently with or prior to the first signal;
• the driving circuit outputs to the vibrator a synthesized signal obtained by adding together the first signal and the second signal while shifting a phase of the first signal and a phase of the second signal from each other;
• and
• the synthesized signal is a sine wave signal which is obtained by synthesizing together a plurality of groups of frequency signals, each group including a first pair of adjacent frequency signals and a second pair of adjacent frequency signals, the first pair of adjacent frequency signals being synthesized together in reverse phase, and the second pair of adjacent frequency signals being synthesized together in phase.