JPH11253880A - Annunciator and wireless communications equipment installed with same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable obtaining sufficient annunciating effect irrespective of irregularity of resonance frequency of a vibrating body in an annunciator equipped with an annunciating unit having a built-in vibrating body to be resonated by receiving the fed drive signal and a signal making circuit for feeding a drive signal to the annunciating unit. SOLUTION: A signal making circuit 5 makes a drive signal D, whose frequency is changed within fixed limits containing resonance frequency of a vibrating body of an annunicating unit 2 to feed it to the annunciating unit 2. There, a change margin of frequency of the drive signal is set corresponding to the irregularity margin of resonance frequency cased by tolerance of items for determining resonance frequency of the vibrating body. And the drive signal has an alternating wave form of a rectangular wave or a sinusoidal wave and the frequency is periodically changed in 1.37-2.98 Hz.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a notifying device which is built in a radio communication device such as a portable telephone, a pager and the like to notify an incoming call.

[0002]

2. Description of the Related Art Conventionally, in a portable telephone, a sound, that is, a sound generator (ringer) for notifying an incoming call by vibration having a frequency in an audible band, and a vibration that can be sensed, for example, a vibration having a frequency of several hundred Hz or less. A built-in vibration generator for notifying of an incoming call is provided, and it is possible to use both depending on the situation. However, in a small device such as a mobile phone, there is almost no space for incorporating both a sound generator and a vibration generator, and there is a problem that the equipment becomes larger due to the provision of both devices.

The applicant has proposed a portable telephone as shown in FIG. 9 (Japanese Patent Application No. 8-161399). The mobile phone has a receiving section (12) for outputting a receiving voice, an operation button (14) such as a numeric keypad, and a transmitting voice on a flat housing (11) on which an antenna (1) is protruded. A notifying unit (2), which includes a transmitting unit (13) to be input and the like, and which can notify an incoming call by both sound and vibration, is mounted at an appropriate position inside the housing (11).

The notification unit (2) is driven at a first frequency in an audible band by a first drive signal to generate a sound wave, and a second frequency lower than the first frequency by a second drive signal. It comprises a second vibrating body driven at (several hundreds of Hz or less) to generate vibration, and a signal generating circuit for generating the first drive signal and the second drive signal. The first and second vibrators are housed in a common casing, and the first vibrator is configured by attaching a coil to the casing via a first diaphragm, while the second vibrator is mounted on the casing. It is configured by attaching a magnet body via two vibrating plates, and a magnetic gap for accommodating the coil of the first vibrating body is formed in the magnet body.

More specifically, as shown in FIG. 2, a first vibrating body (4) for mainly generating a sound wave is provided in a cylindrical casing (21).
And a second vibrating body (3) that is to mainly generate vibration. The casing (21) has a sound emission port (25) at the front opening of the cylindrical main body (22). A ring-shaped front cover member (24) is attached, and a ring-shaped rear cover member (23) is attached to the back opening of the main body (22), so that the whole structure is compact.

The first vibrating body (4) is a circular first vibrator having a peripheral portion sandwiched between a casing body (22) and a front cover member (24).
It is composed of a diaphragm (41) and a coil (42) fixed to the back of the first diaphragm (41). The first vibrator (4) is
It has an audible resonance frequency exceeding 0 Hz. On the other hand, the second vibrating body (3) includes a ring-shaped second vibrating plate (34) having an outer peripheral portion sandwiched between the casing body (22) and the rear cover member (23), and a second vibrating plate (34). ), A permanent magnet (31) magnetized in the axial direction (vertical direction) and fixed to the front surface of the outer yoke (32), and a permanent magnet (31). An inner yoke (33) fixed to the front
The coil (42) of the first vibrating body (4) is vertically movably accommodated in a ring-shaped magnetic gap formed between the facing surface of the inner yoke (2) and the inner yoke (33). The second vibrator (3) is given by
It has a resonance frequency lower than 00 Hz.

FIG. 11 shows a vibration characteristic Cs of the first vibrating body (4).
And the vibration characteristics Cv of the second vibrating body (3), and peaks occur in amplitude at the resonance frequencies Fs and Fv of the vibrating bodies (4) and (3). Therefore, as the sound drive signal and the vibration drive signal, the resonance frequencies Fs and Fv are notified to the notification unit (2).
A large notification effect can be obtained by supplying to the coil (42).

[0008] That is, when performing notification by sound, FIG.
When a sound drive signal Ds having a frequency (for example, about 2 kHz) matching the resonance frequency Fs is supplied to the coil (42) as shown in FIG. As shown, a frequency (for example, 100
(About Hz) is supplied to the coil (42). The sound drive signal Ds is the coil of the notification unit (2)
When supplied to the coil (42), the coil (4) is applied according to Fleming's left-hand rule, based on the relationship between the magnetic field lines radially penetrating the magnetic gap and the circumferential current flowing through the coil (42).
2) generates an axial driving force. Here, since the driving force acts at the frequency of the resonance point, the first vibrator (4) resonates and generates a sound wave. On the other hand, the second vibrating body (3) hardly vibrates because the resonance point is shifted. By the generation of this sound wave, an incoming call is notified audibly.

On the other hand, when the vibration drive signal Dv 'is supplied to the coil (42) of the notification unit (2),
Although an axial driving force is generated in (42), the first vibrating body (3)
Is shifted from the frequency of the driving force,
The vibrating body (3) hardly vibrates, and the second vibrating body (3) having a resonance point at the frequency of the driving force resonates by receiving the reaction force of the driving force, and generates vibration. The occurrence of the vibration informs the user of the incoming call.

[0010]

In the notification unit (2), the diaphragms (41) and (34) and the yokes (32) and (3)
3) and vibrating body (4) such as shape, dimensions, material, etc. of permanent magnet (31)
It is unavoidable that the resonance frequencies of the vibrators (4) and (3) vary due to the tolerance of the parameters for determining the resonance frequency of (3). For example, the thickness of the second diaphragm (34) constituting the second vibrator (3) has a tolerance of 120 μm ± 8 μm, and the resonance frequency Fv when the plate thickness t is 120 μm is 100 Hz. In some cases, since the resonance frequency Fv is proportional to the 1.5th power of the plate thickness t, the variation of the resonance frequency is 100 Hz ± 10 Hz.

FIG. 12 shows a state in which the vibration characteristic a indicated by a solid line deviates from the vibration characteristics b and c indicated by broken lines due to dimensional tolerances and the like. If the vibrating body having the characteristic b is driven, no resonance occurs, and the amplitude of the vibrating body greatly decreases from the peak value Wp at the resonance point to the value W '. In this way, when the notification unit is driven by a drive signal of a constant frequency ignoring the variation of the resonance frequency,
There has been a problem that the amplitude of the vibrator also varies, and a sufficient notification effect cannot be obtained.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a notifying device capable of obtaining a sufficient notifying effect irrespective of a variation in resonance frequency, and a radio communication device including the notifying device.

[0013]

An alarm device according to the present invention comprises:
A vibrating body to be resonated upon receiving the drive signal; and a signal generating circuit for supplying a driving signal to the vibrating body. It is characterized in that a fluctuating drive signal is created and supplied to a vibrating body.

According to the above-described notification device of the present invention, even if the resonance frequency varies due to the dimensional tolerance of the vibrator, the frequency of the drive signal repeatedly varies within a certain range. Resonance occurs when the resonance frequency matches the resonance frequency, and a large amplitude is obtained. Thereafter, when the frequency of the drive signal deviates from the true resonance frequency, resonance does not occur and the amplitude decreases, but when the drive signal again matches the resonance frequency, the amplitude increases. As described above, with the fluctuation of the frequency of the drive signal, the amplitude of the vibrating body repeatedly increases and decreases with the peak at the time of resonance as the peak.

In a specific configuration, the variation width of the frequency of the drive signal corresponds to the variation width of the resonance frequency due to the tolerance of various factors that determine the resonance frequency of the vibrating body. Here, the variation width of the resonance frequency due to the tolerance of the specifications can be obtained experimentally, empirically or theoretically, and by corresponding to the variation width, the variation width of the frequency of the drive signal can be rationally determined. You can decide.

For example, the resonance frequency of the vibrating body is a low frequency that is practically inaudible, specifically, a low frequency of several hundred Hz or less.
It has an amplitude that can be felt. Thereby, a sensible notification effect can be obtained. The drive signal has a pulsed or sinusoidal alternating waveform, and its frequency is preferably in the range of 0.5 to 10 Hz, more preferably in the range of 1.37 to 2.98 Hz, and most preferably in the range of 2.37 Hz.
It fluctuates periodically with a period of 18 Hz. As a result, resonance occurs with a period that is highly effective for the body.

The frequency of the drive signal varies in a triangular wave, a sine wave, or a sawtooth wave. In particular, when the frequency of the drive signal is changed by a sawtooth wave, resonance occurs at a constant period corresponding to the period of the sawtooth wave, and the notification without discomfort is possible. The variation in the frequency of the drive signal is not limited to a continuous one, but may be a stepwise increase or decrease.

A wireless communication device according to the present invention includes the above-described notification device according to the present invention for notifying an incoming call. According to the wireless communication device, a sufficient notification effect can be obtained even if the resonance frequency of the notification device varies, so that the incoming call can be reliably transmitted.

[0019]

According to the annunciation device and the radio communication device having the same according to the present invention, resonance occurs periodically or aperiodically irrespective of the variation of the resonance frequency, and the amplitude of the vibrating body is reduced. Since the amplitude is repeatedly increased and decreased with the amplitude at the time of the resonance as a peak, a large notification effect can be obtained audibly or physically.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a portable telephone shown in FIG. 9 will be specifically described with reference to the drawings. As shown in FIG. 9, a mobile phone according to the present invention has a receiving unit (12) with a built-in speaker, an operation button (10-key, etc.) on the surface of a flat housing (11) provided with an antenna (1). 14),
A transmitting unit (13) with a built-in microphone is provided, and a notification unit (2) for notifying an incoming call by sound or vibration is attached to an appropriate position inside the housing (11).

As shown in FIG. 2, the notification unit (2) is provided in a common casing (21) with a first vibrating body for mainly generating a sound wave.
(4) and a second vibrating body (3) that mainly generates vibration. The casing (21) has a ring-shaped front cover member (24) having a sound emission opening (25) attached to a front opening of the cylindrical main body (22), and a back opening of the main body (22). A ring-shaped rear cover member (23) is attached.

The first vibrator (4) is a circular first vibrator having a peripheral portion sandwiched between the casing body (22) and the front cover member (24).
It is composed of a diaphragm (41) and a coil (42) fixed to the back of the first diaphragm (41). The first vibrator (4) is
It has an audible resonance frequency exceeding 0 Hz. On the other hand, the second vibrating body (3) includes a ring-shaped second vibrating plate (34) having an outer peripheral portion sandwiched between the casing body (22) and the rear cover member (23), and a second vibrating plate (34). ), A permanent magnet (31) magnetized in the axial direction (vertical direction) and fixed to the front surface of the outer yoke (32), and a permanent magnet (31). An inner yoke (33) fixed to the front
The coil (42) of the first vibrating body (4) is vertically movably accommodated in a ring-shaped magnetic gap formed between the facing surface of the inner yoke (2) and the inner yoke (33). The second vibrating body (3) has a frequency band that is practically inaudible, for example, 50 Hz to 30 Hz.
It has a resonance frequency of 0 Hz. The first and second diaphragms (41) and (34) can be formed of a known elastic material such as metal, rubber, and resin. Also, the second diaphragm (34)
In order to obtain a large amount of displacement, a notch or the like is formed as necessary.

FIG. 1 shows a circuit configuration of a main part of a portable telephone provided with the notification unit (2). By operating the operation button (14), the mobile phone can select a calling method based on either the notification of an incoming call by sound or the notification of an incoming call by vibration. The circuit (55) sets the calling method for the control circuit (54). The notification unit (2) has a switch (5
9) Via sound signal creation circuit (57) and vibration signal creation circuit
(5) is connected, and the switching operation of the switch (59) is performed by the control circuit.
(54).

Radio waves transmitted from the base station are transmitted through an antenna.
The signal is always received at a fixed period by (1), and the received signal is subjected to frequency conversion and demodulation by a radio circuit (51), and then supplied to a signal processing circuit (52), where the digital audio signal is received. And the control signal is extracted. The operation of the signal processing circuit (52) is controlled by the control circuit (54). The control signal obtained from the signal processing circuit (52) is supplied to the incoming call detection circuit (53), and the presence or absence of a call to the own station is detected. On the other hand, the audio signal obtained from the signal processing circuit (52) is emitted from the speaker via an audio signal processing circuit (not shown).

The sound signal generation circuit (57) generates a sound drive signal Ds having an audible frequency in order to perform sound notification. On the other hand, the vibration signal generation circuit (5) generates a low-frequency vibration drive signal Dv of several hundreds Hz or less in order to perform notification by sensible vibration, and includes a modulation signal generation circuit (56). It comprises a vibration signal processing circuit (58). Specific configurations of the modulation signal generation circuit (56) and the vibration signal processing circuit (58) will be described later.

The control circuit (54) switches the switch (59) according to the call setting by the operation button (14) when the incoming call detection circuit (53) detects the call to the own station. When notifying the incoming call only by sound, the switch (59) is switched to the sound signal generation circuit (57), and only the sound drive signal is supplied to the notification unit (2). On the other hand, when an incoming call is notified only by vibration, the switch (59) is switched to the vibration signal generation circuit (5) to supply only the vibration drive signal to the notification unit (2).

As shown in FIG. 10A, the sound drive signal Ds generated by the sound signal generation circuit (57) has an audio band of 2 kHz.
A pulse signal having a frequency of z is intermittently formed at a cycle of 16 Hz, and the intermittent pulse generates an audible notification sound called "Plurul ...". The frequency of 2 kHz corresponds to the vibration shown in FIG. It matches the resonance frequency Fv in the characteristic Cs. On the other hand, the vibration drive signal Dv generated by the vibration signal generation circuit (5) is shown in FIG.
As shown in the figure, the frequency is, for example, 100 Hz ± around a frequency of about 100 Hz that the human body easily feels as vibration.
It varies periodically in the range of 10 Hz, and the center frequency 100 Hz matches the resonance frequency Fv in the vibration characteristic Cv shown in FIG.

FIG. 3A shows an example in which the frequency F of the vibration driving signal Dv is changed by a triangular wave.
Is ± ΔF = ± 10 assuming the center frequency Fm = 100 Hz.
Hz, and its fluctuation frequency (1 / Tm) is 0.5.
It is set in the range of 10 Hz to 10 Hz. Here, the frequency variation range ± ΔF is determined according to the variation range of the resonance frequency resulting from the tolerance of the parameters for determining the resonance frequency of the second vibrating body (3).

In this case, if there is no deviation in the resonance frequency of the second vibrating body (3), the frequency F becomes the center frequency F
Resonance occurs when the value coincides with m, and an amplitude curve Wa varying with the amplitude Wp at the resonance point as a peak is obtained as shown by the solid line in FIG. Further, the resonance frequency of the second vibrating body (3) is shifted due to dimensional tolerance of the diaphragm or the like. For example, even if a true resonance point exists at point P in FIG. At the point of passing the point P, resonance occurs, and an amplitude curve Wb fluctuating with the amplitude Wp at the resonance point as a peak is obtained as shown by a broken line in FIG.

As described above, by varying the frequency of the vibration drive signal Dv in the range of Fm ± ΔF, an amplitude that fluctuates with the amplitude Wp at the resonance point as a peak is always obtained regardless of the variation of the resonance frequency. And a sufficient notification effect can be obtained. Further, the fluctuation of the amplitude further increases the perceived notification effect.

On the other hand, at a constant frequency Fm, the second vibrator
In the case of driving (3), if a deviation occurs in the resonance frequency of the second vibrating body (3), no resonance occurs and the second vibrating body (3)
Has a small value W 'greatly reduced from the peak value Wp at the resonance point, as shown by the two-dot chain line in FIG. 3B. Therefore, a sufficient notification effect cannot be obtained.

The frequency of the vibration drive signal Dv can be varied not only by a triangular wave but also by a sine wave or a sawtooth wave. For example, in the case where the frequency is changed by a sawtooth wave as shown in FIG.
Assuming that there is no deviation in the resonance frequency of (3),
As shown by the solid line in (b), an amplitude curve Wa fluctuating with the amplitude Wp at the resonance point as a peak is obtained. Even if there is a shift in the resonance frequency of the second vibrating body (3), FIG. As shown by a broken line, an amplitude curve Wb fluctuating with the amplitude Wp at the resonance point as a peak is obtained. In particular, in this case, the resonance of the second vibrating body (3) occurs at a constant period, so that notification without discomfort is realized.

The frequency of the vibration drive signal Dv is shown in FIG.
As shown in (1), a method of gradually increasing or decreasing stepwise with a minute frequency width can be adopted. In this case, the same effect can be obtained.

In this embodiment, as shown in FIG. 1, the vibration signal generation circuit (5) is composed of a modulation signal generation circuit (56) and a sound signal generation circuit (57). Here, the modulation signal generation circuit
(56) generates a modulation signal Sm for modulating the frequency of the vibration drive signal.
5 (a) and the same waveform as the variation waveform of the frequency of the vibration drive signal shown in FIG. 5 (a). A conventionally well-known signal generation circuit can be used to create such a modulation signal.

On the other hand, the vibration signal processing circuit (58) can be configured as shown in FIG. 7, for example. The vibration signal processing circuit (58) is connected to the output terminal of the charging unit (6) including the capacitance element C and the resistance elements R1 and R2 via the first comparator (61) and the second comparator (62). And a discharge control transistor (64) and a T-flip-flop circuit (65) connected to the output terminal of the RS-flip-flop circuit (63). The modulation signal Sm described above is input to the inverting input terminal of the first comparator (61), and the reference voltage signal Vref is input to the non-inverting input terminal of the second comparator (62).

FIG. 8 shows the operation of the vibration signal processing circuit (58). That is, when the charging unit (6) is supplied with power and charged, the voltage signal Vo output from the charging unit (6) gradually increases, and the magnitude of the signal becomes the level of the modulation signal Sm. , The set signal is supplied from the first comparator (61) to the RS-flip-flop circuit (63), and the output So of the RS-flip-flop circuit (63) is turned on. As a result, the transistor (64)
N, and the discharging of the charging section (6) is started.
Thereafter, when the voltage signal Vo output from the charging unit (6) drops to the level of the reference voltage signal Vref, the second comparator (62) is turned on, and the second comparator (62) outputs RS
The reset signal is supplied to the flip-flop circuit (63), and the output of the RS-flip-flop circuit (63) is turned off. As a result, the transistor (64) is turned off,
The charging of the charging section (6) will be resumed.

In this way, the charging section (6) repeats charging and discharging (FIG. 8 (a)), and the output So of the RS-flip-flop circuit (63) repeats ON / OFF (FIG. 8 (b)). ), In synchronization with the rise of the output So, a T-flip-flop circuit
The output of (65) is switched from ON to OFF and from OFF to ON. As a result, the voltage signal Vo is output from the T-flip-flop circuit (65) as shown in FIG.
, A drive signal Dv that is turned on / off each time the level reaches the threshold level is obtained. Here, when the modulation signal Sm fluctuates, for example, with a triangular wave, the period To of the drive signal Dv also fluctuates with a triangular wave, so that the modulation drive signal Dv as shown in FIG. 4 is obtained.

The variation frequency of the period To of the modulation drive signal Dv,
That is, in order to examine the optimum range of the frequency of the modulation signal Sm, first, an experiment was performed to confirm the notification effect on three subjects (A, B, and C). In the experiment, the above-described wireless communication device (pager) of the present invention was placed on the palm of the subject, the modulation frequency was continuously changed, and the sense of vibration was reported. The declared value was an arbitrary value, which was 100 when vibration was perceived with the highest sensitivity, and 0 when vibration was not felt. Further, in the experiment, a method was employed in which the modulation frequency that would be the vibration sensation 100 was first searched, and then the modulation frequency was gradually changed, and when a change occurred in the vibration sensation, it was appropriately reported. The result is shown in FIG.

FIG. 13 shows that all three subjects had the highest vibration sensation when the modulation frequency was 1.5 to 2.5 Hz.
It can be seen that it decreases as the distance from this range increases. As is apparent from this result, although the amount of decrease in the vibration sensation varies among individuals, the change tendencies coincide, so that FIG. 13 is considered to indicate a basic variation pattern of the perceptual characteristics. .

Next, with respect to ten subjects (a to j), the above-mentioned wireless communication device (pager) of the present invention was placed on the palm of the subject, and the fluctuating frequency was continuously changed. The modulation frequency (optimal modulation frequency) was declared. Table 1 shows the results.

[0041]

[Table 1]

As is clear from this table, since the individual difference of the optimum modulation frequency is small, these average values Ave =
2.177 Hz can be the universal optimum modulation frequency. Further, since the standard deviation SD of the optimum fluctuation frequency in Table 1 is 0.268, the range is three times the standard deviation SD around the average value Ave (Ave ± 3SD), that is, 1.3.
If the modulation frequency is set within the range of 7 to 2.98 Hz,
An extremely high notification effect can be given to almost all users.

The configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims. For example, the present invention provides a notification unit having both functions of a sound generator and a vibration generator as shown in FIG.
The present invention is not limited to (2), and the present invention can be applied to an alarm device having a sound generator and a vibration generator separately. Further, the vibrating body of the notification unit (2) is not limited to the one using the magnetic force as described above, and various known structures can be adopted as long as it uses resonance. For example, a piezoelectric element is used. Those that have done can also be adopted. Furthermore, a signal generation circuit for vibration
(5) may be constituted by a microcomputer, and the modulation drive signal Dv as shown in FIG. 4 may be created by software processing.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a circuit configuration of a mobile phone according to the present invention.

FIG. 2 is an enlarged sectional view of a notification unit.

FIG. 3 is a waveform diagram showing a relationship between a frequency of a drive signal and an amplitude of a vibrating body.

FIG. 4 is a waveform diagram of a drive signal.

FIG. 5 is a waveform chart showing a relationship between a frequency of a drive signal and an amplitude of a vibrating body in another embodiment.

FIG. 6 is a waveform diagram showing a change in the frequency of a drive signal in still another embodiment.

FIG. 7 is a block diagram illustrating a configuration example of a vibration signal processing circuit.

FIG. 8 is a waveform chart showing the operation of the vibration signal processing circuit.

FIG. 9 is a perspective view illustrating an appearance of a mobile phone to which the present invention is applied.

FIG. 10 is a waveform diagram showing a sound drive signal and a vibration drive signal in a conventional mobile phone.

FIG. 11 is a graph showing vibration characteristics of a vibrating body.

FIG. 12 is a diagram illustrating a decrease in amplitude due to a shift in resonance frequency.

FIG. 13 is a graph showing the results of an experiment performed to determine the optimum range of the modulation frequency.

[Explanation of symbols]

 (2) Notification unit (4) First vibrating body (3) Second vibrating body (57) Sound signal generation circuit (5) Vibration signal generation circuit (56) Modulation signal generation circuit (58) Vibration signal processing circuit (6) Charging section (63) RS-flip-flop circuit (65) T-flip-flop circuit

Claims (10)

[Claims] 1. An alarm device comprising: a vibrating body to be resonated upon receiving a drive signal; and a signal generating circuit for supplying a driving signal to the vibrating body, wherein the signal generating circuit determines a resonance frequency of the vibrating body. A notifying device characterized in that a driving signal whose frequency fluctuates within a certain range including the driving signal is generated and supplied to a vibrating body. 2. The alarm device according to claim 1, wherein the variation width of the frequency of the drive signal corresponds to the variation width of the resonance frequency due to a tolerance of specifications for determining the resonance frequency of the vibrating body. 3. The resonance frequency of the vibrating body is a low frequency of several hundred Hz or less, and the vibration of the vibrating body at the resonance frequency is
The notification device according to claim 1, wherein the notification device has an amplitude that can be felt. 4. The notification device according to claim 1, wherein the drive signal has an alternating waveform of a rectangular wave or a sine wave, and the frequency periodically fluctuates at 0.5 to 10 Hz. 5. The driving signal has a frequency of 1.37 to 2.98.
The notification device according to claim 4, wherein the notification device periodically changes in a range of Hz. 6. The notification device according to claim 5, wherein the frequency of the drive signal periodically fluctuates at 2.18 Hz. 7. The notification device according to claim 1, wherein the frequency of the drive signal fluctuates as a triangular wave, a sine wave, or a sawtooth wave having an amplitude in the predetermined range. 8. The notification device according to claim 1, wherein the frequency of the drive signal gradually increases or decreases stepwise within the predetermined range. 9. A vibrating body comprising: a casing; a vibrating plate having a fixed end on an inner peripheral wall of the casing; a magnet body attached to a free end of the vibrating plate; and a coil disposed opposite to the magnet body. The notification device according to any one of claims 1 to 8, further comprising: a driving signal supplied to the coil. 10. A notifying device for notifying an incoming call, the notifying device includes a vibrating body to be resonated upon receiving a driving signal and a signal generating circuit for supplying a driving signal to the vibrating body. In a wireless communication apparatus according to the present invention, the signal creation circuit creates a drive signal whose frequency fluctuates within a certain range including a resonance frequency of the vibrating body, and supplies the driving signal to the vibrating body.