JP2947248B2 - Electric-mechanical-acoustic converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric-mechanical-acoustic converter used for generating a ringing sound or a ringing vibration of a portable terminal such as a portable telephone, a pager, and a PHS (Personal Handy Phone Set). is there.

[0002]

2. Description of the Related Art Conventionally, mobile phones, pagers, PHSs
(Personal Handy Phone Set) and other mobile terminal devices,
An electric-mechanical-acoustic transducer is installed in the body,
It has been used as a means for selectively generating a bell sound or vibration by connecting an electric signal generator to notify an incoming call.

A conventional electric-mechanical-acoustic converter is shown in FIGS.
This will be described with reference to FIG. FIG. 10 is a block circuit diagram of the concept of a conventional electro-mechanical-acoustic converter, FIG. 11 is a side sectional view of an electro-mechanical-acoustic converter which is the main part thereof, and FIG. FIG. 13 is an electrical impedance frequency characteristic diagram of the acoustic transducer, and FIG. 13 is a perspective view of a mobile phone equipped with the same device.

[0004] First, a description will be given of an electro-mechanical-acoustic transducer which is a main part. Reference numeral 1 denotes a support member having openings at both ends, and 2 denotes a support member via a suspension 3.
A movable portion comprising a yoke 2a, a magnet 2b, and a plate 2c mounted on one of the openings, and a voice coil 5 inserted into a magnetic gap 2d of the movable portion 2 and the other of the support members 1. The diaphragm is attached to the opening of the above.

[0005] The operation of the electro-mechanical-acoustic transducer will be described.
The mass and the stiffness of the suspension 3 constitute a mechanical resonance system, and have a unique resonance frequency. Also,
The diaphragm 4 to which the voice coil 5 is coupled also has a unique resonance frequency generated by its own stiffness and mass.

When an electric signal is applied to the voice coil 5, an action / reaction force is generated between the voice coil 5 and the movable portion 2. When the electric signal matches the inherent resonance frequency of the movable section 2, the movable section 2 vibrates greatly and transmits the vibration force to the support member 1 via the suspension 3. Further, when the electric signal matches the inherent resonance frequency of the diaphragm 4 to which the voice coil 5 is coupled, the diaphragm 4 is greatly vibrated, and a buzzer sound is generated.

As shown in the electric impedance frequency characteristic diagram of FIG. 12, the natural resonance frequency f01 of the movable section 2 is 1
It is around 00Hz, and the natural resonance frequency f01 of the diaphragm 4 is 2KHz
Since it is different from before and after, the following convenience can be obtained by generating the respective resonant frequencies.

That is, as shown in FIGS. 10 and 13, an electro-mechanical-sound device A incorporated in a mobile phone 6 sends a signal of a predetermined frequency to an electric signal generator 7 in accordance with an instruction from the main body of the mobile phone 6. The electric signal is input to the electric-mechanical-acoustic converter A, the diaphragm 4 is vibrated to generate sound, the movable part 2 is vibrated, and the mobile phone 6 is vibrated to use the vibration. To notify the person of the incoming call.

If either the movable part 2 or the natural resonance frequency of the diaphragm 4 is selected as the signal of the predetermined frequency, resonance occurs at one of them and a large vibration or sound is obtained. If you do that, you can get something with great vibration and sound.

The above-mentioned conventional electric-mechanical-acoustic converter
Although A has been described as being vibrated and pronounced, there are some which only vibrate or produce sound, and the same applies to the electro-mechanical-acoustic converter in the following embodiments of the invention.

[0011]

As apparent from the above description, in order to generate a large sound or vibration in the electric-mechanical-acoustic converter A, the resonance frequency matching the inherent frequency is set to the electric signal generator 7. The natural frequency changes due to changes in the environmental conditions such as the ambient temperature of the electro-mechanical-acoustic transducer A, and the oscillation frequency of the electric signal generator 7 changes slightly, And the output of the vibration decreases or becomes unstable.

The present invention solves the above problems and provides an electro-mechanical-acoustic converter capable of obtaining a stable oscillation output.

[0013]

Means for Solving the Problems In order to solve the above problems, the electro-mechanical-acoustic converter of the present invention comprises at least
It has two different mechanical resonance systems , and vibrates and sounds input signals.
Electric-mechanical that can be converted to any of
And the acoustic conversion means, before Symbol electrical - mechanical - before the acoustic transducer means
A signal in a frequency band including at least one of the resonance frequencies of the mechanical resonance system,
Signal supply means for supplying as an input signal, and the electric machine
Electric impedance using mechanical-acoustic conversion means as circuit elements
The dance element Z1 is directly connected to the electric impedance element Z1.
Connected to the column and substantially the same as the electric impedance element Z1.
An electrical impedance element Z2 having the same temperature characteristic,
Parallel with the series circuit of the electric impedance elements Z1 and Z2
Where each is an electrical impedance element connected in series
And the input from the signal supply means is
The contacts of the electric impedance elements Z1 and Z3 and the electric
Applied to the contacts of the impedance elements Z2 and Z4.
Output from the contacts of Z1, Z2 and the contacts of Z3, Z4
Output bridge circuit and differential connected to the output contact
And an electro-mechanical-acoustic converter.
The resonance frequency of the mechanical resonance system according to the output of the
One of these frequencies is detected and the signal is
And frequency detecting means for supplying to said signal supply means, said electrostatic
Inserted in any position of a closed loop composed of gas-mechanical-acoustic conversion means, signal supply means, and frequency detection means
Signal switching means, and the signal switching means
When the loop is closed, it is supplied from the signal supply means.
Input signal causes the electro-mechanical-acoustic conversion means to
And a predetermined frequency signal is detected by the frequency detecting means in accordance with the output, and the signal is supplied to the signal supplying means.
By supplying, prior Symbol electro - mechanical - acoustic transducer means
Is driven at a predetermined resonance frequency, so that a fluctuation in the resonance frequency is always detected by the frequency detection means, and an extremely stable oscillation output can be efficiently obtained.

Further, electrical of the present invention - mechanical - acoustic transducer comprises an upper Symbol electro - mechanical - outside the closed loop of the acoustic converter
Side, the input signal of the amplifying means as the signal supply means.
Te, before Symbol electro - mechanical - since the electrical signal of a frequency band including the <br/> resonance frequency of the mechanical resonance system of the acoustic transducer means coupled oscillating means for oscillating, constantly frequency detects the variation of the resonant frequency <br An extremely stable oscillation output detected by the output means can be efficiently obtained.

Further, electrical of the present invention - mechanical - acoustic transducer comprises at least two different has mechanical resonance system, also can be converted to either the first or the second electrical signal the vibrations and sound
An electro-mechanical-acoustic conversion means configured as described above,
Oscillates before Symbol first electrical signal of the frequency band including the resonance frequency of the mechanical resonance system, a first oscillating means for outputting prior SL electric over mechanical chromatography acoustic transducer means, said first electrical signal and before Symbol oscillates a second electrical signal, prior Symbol electro - mechanical - acoustic transducer hands
A second oscillating means for outputting a stage, before Symbol electro - mechanical - frequency detecting means for detecting the output level of the acoustic transducer means, before
Comparing means for comparing the output level with the reference level;
When the level is equal to or higher than the reference level, prior Symbol detected before Symbol electrical oscillating frequency - mechanical - consists of a control means for controlling the pre-Symbol second oscillation means so as to output the sound converting means Therefore, the resonance frequency can be found very easily, and the operation at the resonance frequency can be performed very easily and quickly.

The electro-mechanical-acoustic converter of the present invention has at least two different mechanical resonance systems , and is configured to be able to convert an electric signal into both vibration and sound.
Electro - mechanical - acoustic conversion means, said oscillating electrical signal of a frequency band including the resonance frequency of the mechanical resonance system, before Symbol electro - mechanical - an oscillating means for outputting a pre-Symbol electrical signal into an acoustic conversion means, before a frequency detecting unit that detect the frequency with a preset output level of the acoustic conversion means, - serial electro - mechanical
Time before Symbol electricity by division - machines - co acoustic conversion means
Constituted by a control means for controlling the vibration system before Symbol oscillation means so as to oscillate in the previous SL oscillating means the detected frequency as a resonant frequency oscillation before Symbol frequency detection means of the frequency band of the frequency signal including a resonance frequency of the Therefore , the oscillation means can be reduced to one, and the deviation of the resonance frequency due to an environmental change or the like can be constantly monitored and corrected to maintain a stable resonance state. Further, the frequency detecting means for detecting a resonance frequency in the bridge circuit prior Symbol electrical prior SL-bridge circuit - to cancel the change by using a circuit element having a substantially equal resistance temperature characteristics and the resistance temperature characteristics of the acoustic transducer means - mechanical Therefore, a stable resonance state can be maintained.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a block circuit diagram of a main part of a portable terminal using an electro-mechanical-acoustic converter according to Embodiment 1 of the present invention. According to FIG. 1, reference numeral 10 denotes an oscillator, 11 denotes an amplifier which is an amplifying means to which the output of the oscillator 10 is input, and 12 denotes a conventional electro-mechanical-acoustic converter which is an electro-mechanical-acoustic converting means. Electricity with the same configuration as A
A mechanical-acoustic transducer 13 is a frequency detector that detects an output of the electric-mechanical-acoustic transducer 12 at the time of resonance and outputs the output to the amplifier 11, and includes an operational amplifier 14 and a bridge circuit 15. Z2, Z3, Z4 are the load impedances of the circuit elements constituting the bridge, Z1 is the electrical impedance of the voice coil of the electro-mechanical-acoustic transducer 12, and Z1, Z2, Z3, Z4 Bridge circuit 15
, And for a frequency signal other than the resonance frequency, the output voltage E2 is set to a balanced state in which the output voltage E2 becomes a small output (preferably 0) with respect to the input voltage E1. Note that the oscillator
10 oscillates a frequency in a frequency band including at least one of the natural frequencies of the electro-mechanical-acoustic transducer 12 (for example, f01 or f02 described in FIG. 12 of the related art). A signal source may be used, and its output voltage level is controlled to an oscillation output that does not substantially generate sound or vibration by driving the electro-mechanical-acoustic converter 12 even when amplified by the amplifier 11. .

Next, the operation will be described. When a signal C from the outside, which will be described later, is generated, the switch SW1 which is normally in the OFF state is turned on by the signal C. SW1 is O
N, the output signal of the oscillator 10 is sent to the amplifier 11,
This output signal is amplified and output by the amplifier 11, and
It is input to the electrical-mechanical-acoustic converter 12. The oscillation output from the oscillator 10 amplified by the amplifier 11 causes the resonance point f01
Alternatively, when the frequency component at f02 is input to the electro-mechanical-acoustic converter 12, the electrical impedance Z1 of the electro-mechanical-acoustic converter 12 sharply increases, and the balance of the bridge circuit 15 at this resonance frequency is lost, and the operational amplifier The output from 14 increases and this output is input to amplifier 11. This change is detected by the frequency detector 13 and further amplified by feeding it back to the amplifier 11, and by repeating this, one or both of the vibration and / or sound generation by the electro-mechanical-acoustic transducer 12 are self-excited It is what is done.

In the above-described embodiment, when the above-mentioned natural frequency of the electric-mechanical-acoustic transducer 12 fluctuates due to a change in the environment in which the electric-mechanical-acoustic transducer 12 is placed,
Although the output for driving the electro-mechanical-acoustic transducer 12 is reduced and vibration and oscillation are suppressed, since the oscillation from the oscillator 10 continues, the frequency detector 13 detects the resonance point again. And an electro-mechanical-acoustic transducer at a new resonance point
Twelve vibrations and pronunciations will be self-excited.

Here, the bridge circuit 15 constituting the frequency detector 13 for detecting the resonance frequency of the electric-mechanical-acoustic transducer 12 will be described in more detail.

[0022] In the bridge circuit 15 constituted by the impedance Z1, Z2, Z3, Z4, the input voltage E1 is applied to the junction point B between the bonding points G and Z 2 and Z4 between Z1 and Z 3. The output voltage E2 is taken from the junction point D between the bonding points C and Z 3 and Z4 between Z1 and Z 2. The relationship between the input voltage E1 and the output voltage E2 at this time is expressed by the following equation.

E2 = ｛[Z1 / (Z1 + Z2)]-[Z
3 / (Z3 + Z4)]｝ E1 Here, if Z1 / Z2 = Z3 / Z4, the bridge circuit 15 is in a balanced state, and the level of the output voltage E2 is zero. If Z2, Z3 and Z4 are, for example, fixed resistors,
The impedance value has a constant resistance value in all frequency bands without having frequency characteristics. Meanwhile, electricity-machinery-
The electric impedance Z1 of the acoustic transducer 12 increases at the resonance frequency (see FIG. 12). Therefore, for example, the bridge circuit 15 is set to a value close to the DC resistance value of the voice coil 5 described in FIG. If the equilibrium state is maintained, the value of Z1 becomes large at the resonance point of the electro-mechanical-acoustic converter 12 at which the electric impedance greatly increases, and the equilibrium condition of the bridge circuit 15 is not satisfied. That is, the bridge circuit 15 detects the resonance frequency of the electro-mechanical-acoustic converter 12. For example, when the DC resistance of the voice coil 5 is 8Ω, Z2 = 0.5Ω and Z3 = 8000.
Ω, Z4 = 500Ω, resistance value of Z1 / Z2 = Z3
/ Z4 is set to satisfy the equilibrium condition. Note that Z2 connected in series to the electro-mechanical-acoustic transducer 12
In order to reduce the power loss due to this element, Z2 is made smaller than Z1, that is, the impedance ratio, Z
It is desirable that the resistance value of 1 / Z2 or Z3 / Z4 be 10 or more. Similarly, the series connection of Z3 and Z4, which is connected in parallel to the series connection of Z1 and Z2, is 800 times 1000 times larger than Z1 = 8Ω as shown in the above numerical value.
Assuming that 0Ω, that is, Z3 >> Z1, most of the input current flows to the electro-mechanical-acoustic converter 12, and large power is obtained by frequency detection, which is a circuit operation that is not directly related to the main purpose of vibration and sound generation. It is desirable to prevent losses from occurring.

The electric impedance Z1 of the electro-mechanical-acoustic converter 12 is the electric impedance of the voice coil. The material of the coil usually used for this type of electro-mechanical-acoustic converter 12 is copper or aluminum. is there. When the temperature of the environment in which the electro-mechanical-acoustic transducer 12 is used changes to a low temperature or a high temperature, the resistance value of the copper or aluminum coil changes as the temperature changes.
The bridge circuit 15 constituting the frequency detector 13 keeps Z1, Z2, Z3 and Z4 in an equilibrium state in the initial setting of the circuit, but when the temperature of the use environment changes from the temperature in the initial setting, the resistance value of Z1 Change, the balance condition of the bridge circuit 15 is broken, and the operation of the frequency detector 13 becomes unstable. To prevent this, the impedance ratio, Z
It is sufficient that the resistance values / Z2 and Z3 / Z4 of 1 do not change due to a temperature change. If Z3 and Z4 are selected as those having a small temperature change as the fixed resistance as described above, Z3 / Z4
Does not change significantly. Further, if the same material is used for the resistors, the rate of change of the resistance value with the temperature change is equal, so that the ratio of Z3 / Z4 can be made substantially constant with respect to the temperature change. Similarly, if an element having the same temperature characteristic as that of the coil of the electro-mechanical-acoustic transducer 12 is used as Z2, it is possible to make the ratio of the resistance value of Z1 / Z2 constant regardless of the temperature. Become. The element used as Z2 for this purpose is a temperature-sensitive resistor having the same temperature characteristics as the coil (copper or aluminum or the like) of the electro-mechanical-acoustic converter 12, or a high frequency in which the inductance component can be ignored in an audio band of 20 kHz or less. Coil for use.

With the above configuration, the electro-mechanical-acoustic converter 12 is always stable even when the temperature of the use environment changes.
It becomes an electro-mechanical-acoustic converter that can produce sound and vibration.

(Embodiment 2) FIG. 2 is a block circuit diagram of a main part of a portable terminal using an electro-mechanical-acoustic converter according to Embodiment 2 of the present invention. According to the figure, 37 is an antenna, 36 is a received signal processing unit, 38 is a receiver which is a small speaker, 10 is an oscillator, 11 is an amplifier which is an amplifying means to which an output of the oscillator 10 is input, and 12 is an amplifier. Is a conventional electric-mechanical-acoustic transducer A, which is an electric-mechanical-acoustic converter
An electro-mechanical-acoustic transducer 13 has the same configuration as that of the first embodiment. Reference numeral 13 denotes a frequency detector that detects an output of the electro-mechanical-acoustic converter 12 at resonance and outputs the output to the amplifier 11.
As the constituent circuit elements described above, a bridge circuit including a temperature-sensitive resistor having a temperature characteristic substantially equal to the temperature characteristic of the resistance of the voice coil of the electro-mechanical-acoustic converter 12 is included. Note that the oscillator 10 oscillates a frequency in a frequency band including at least one of the natural frequencies of the electro-mechanical-acoustic transducer 12 (the natural frequency has been described in the related art and will not be described). However, even if the output voltage level is amplified by the amplifier 11, the electric-mechanical-acoustic converter 12
And the oscillation output is controlled to such an extent that no substantial sound or vibration is generated.

Next, the operation will be described. Antenna 37
Receives an incoming signal transmitted from a transmitter of a mobile phone. The incoming signal includes a received signal indicating an incoming call and a received sound signal that is a voice of a sender.
This incoming signal is signal-processed in the received signal processing unit 36, and first, a signal C is generated in response to the received signal for notifying the receiver of the incoming call. When the receiver knows the incoming call and puts the mobile phone into a receivable state, the reception signal processing unit 36 stops the signal C, and enters a state in which the reception sound signal is transmitted to the receiver 38, and the receiver 38 generates the reception sound. When the signal C is generated,
The signal SW normally turns off the switch SW1 due to the signal C.
N. When SW1 is turned on, the output signal of the oscillator 10 is sent to the amplifier 11, and this output signal is amplified and output by the amplifier 11, and is input to the electro-mechanical-acoustic converter 12.

At this time, at the natural frequency (f01 or f02) of the electric-mechanical-acoustic transducer 12, the electric impedance sharply increases due to the resonance phenomenon. This change is detected by the frequency detector 13 and further amplified by feeding it back to the amplifier 11. As a result, as described above, the output of the electro-mechanical-acoustic converter 12 is self-excited, and vibration and sound generation occur.

A limiter 16 limits the input from the frequency detector 13 to the amplifier 11 to keep the input voltage of the electro-mechanical-acoustic converter 12 constant. However, the limiter 16 is not necessarily provided. May be.

As described above, the electro-mechanical-acoustic converter of the above-described embodiment always oscillates the signal in the frequency band including the resonance frequency, which is the natural frequency of the electro-mechanical-acoustic converter, with the oscillator, and the amplifier. And self-excited by electric-mechanical-
In addition to causing the acoustic transducer to vibrate or produce sound, the fluctuation of the resonance frequency of the electro-mechanical-acoustic transducer is always detected by the frequency detector in response to changes in the operating environment conditions including temperature changes, and this is further detected. An extremely stable oscillation output can be efficiently obtained by tracking.

(Embodiment 3) Embodiment 3 of the present invention will be described with reference to the block circuit diagram of FIG. In the description, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. That is, the difference between the first embodiment and the first embodiment lies in the elimination of the oscillator described above.
An electric circuit including the amplifier 11 and the frequency detector 13 uses noise such as thermal noise in its own circuit instead of the oscillator. As in the first embodiment, the frequency detector 13 is formed of a bridge circuit having a temperature-sensitive resistor in its circuit element.

Noise such as thermal noise is composed of frequency components of a wide range of band frequencies, and is generally lower in level than signal components. SW1 becomes O by signal C
N, this noise is amplified by the amplifier 11,
It is input to the electrical-mechanical-acoustic converter 12. Frequency detector
The resonance frequency is detected at 13 and self-excitedly amplified as described in the first embodiment, thereby causing the electro-mechanical-acoustic converter 12 to vibrate or generate sound. As a result, the oscillator can be eliminated to contribute to simplification of the device, and the size can be reduced. Further, a stable output can be obtained with respect to a temperature change.

(Embodiment 4) Embodiment 4 of the present invention will be described with reference to the block circuit diagram of FIG. In the description, only differences from the third embodiment will be described.

The difference from the third embodiment is that a low-pass filter 19 and a high-pass filter 20 are connected to an amplifier 11 and a frequency detector 13.
The switch SW2, which can be operated by the user as needed, can be selected and applied to the apparatus. As in the first embodiment, the frequency detector 13 is formed of a bridge circuit having a temperature-sensitive resistor in its circuit element.

The electro-mechanical-acoustic transducer 12 has at least two
Low frequency natural resonance frequency f0
1 generates vibration, and generates sound at a high-frequency natural resonance frequency f02. When vibration occurs, the switch SW2 is turned on by the selection signal D corresponding to the state of a selection switch (not shown) that can be operated by the user as necessary, the high-frequency f02 is cut by the low-pass filter 19, and the low-frequency Pass f01. When a sound is generated, the switch SW2 is turned to the a side by the signal D, the low frequency f01 is cut by the high pass filter 20, and the high frequency f02 is passed. Normally, when only vibration or sound is generated, the switch SW2 may be set to either A or B. Intermittent vibration or sound can also be generated by turning on / off the switch SW1 using the signal C as a repetitive pulse of a predetermined cycle. On the other hand, switch SW
If the switch SW2 is alternately switched to the side A and the side A while the switch 1 is in the ON state, vibration and sound can be generated alternately in a time-division manner. Note that only one of the low-pass filter 19 and the high-pass filter 20 may pass two natural resonance frequencies to simultaneously generate vibration and sound.

Further, it has three or more natural resonance frequencies,
When a natural resonance frequency surrounded by the other two resonance points is used, a bandpass filter may be used instead of the two filters 19 and 20 in FIG.

With the above arrangement, self-sustained pulsation outside the target is prevented, and when used in a mobile phone, vibration and sound can be selected very easily. Further, a stable output can be obtained with respect to a temperature change.

(Fifth Embodiment) A fifth embodiment of the present invention will be described with reference to the block circuit diagram of FIG. The main difference between the present embodiment and the fourth embodiment is that a limiter 21 is inserted on the output side of the frequency detector 13. As in the first embodiment, the frequency detector 13 is formed of a bridge circuit having a temperature-sensitive resistor in its circuit element.

With the above configuration, the output level of the frequency detector 13 is limited and the amplifier 11 or the electro-mechanical-acoustic converter 12
To prevent excessive input due to self-excited oscillation to the power supply.

(Embodiment 6) Embodiment 6 of the present invention will be described with reference to the block circuit diagram of FIG. The main difference between the present embodiment and the third embodiment is that the switch SW
3 is provided between the signal processing unit 36 and the receiver 38.
As in the first embodiment, the frequency detector 13 is formed of a bridge circuit having a temperature-sensitive resistor in its circuit element.

Normally, the reception sound, which is the voice of the sender, is reproduced by the receiver 38 with the portable telephone kept in touch. Therefore, the sound pressure reproduced from the receiver 38 is low, and the receiver sound cannot be heard when the mobile phone is separated from the ear. Further, since the sound pressure level reproduced by the receiver 38 may cause damage to the ear, it is legally restricted to increase the sound pressure level more than necessary. Therefore, a switch SW3 is provided in front of the receiver 38, the switch SW1 is turned off, the output from the frequency detector 13 is cut off, and the reception signal output from the signal processing unit 36 is input to the amplifier 11 by the switch SW3. If the signal is amplified at 11 and reproduced by the electric-mechanical-acoustic converter 12, the received sound can be heard even when the user is away from the mobile phone. Also, the signal to be reproduced is not only the reception sound,
It may be a music signal or a message message. Further, vibration may be generated by the electric-mechanical-acoustic converter 12. Further, the reproduction of the reception sound may be performed not only when the reception sound is received but also when a conversation is exchanged between the sender and the receiver.

(Embodiment 7) Embodiment 7 of the present invention will be described with reference to the block circuit diagram of FIG. The main difference between the present embodiment and the sixth embodiment is that the switch SW
That is, the output of No. 3 is provided after the amplifier 11. in this case,
The received sound sent from the signal processing unit 36 to the switch SW3 is
The sound is amplified to a sound pressure level necessary for reproduction by the electric-mechanical-acoustic converter 12. As a result, it is not necessary to adjust the amplification factor of the amplifier 11 or the like.

(Eighth Embodiment) An eighth embodiment of the present invention will be described with reference to the block circuit diagram of FIG. In the figure, 12 is an electro-mechanical-acoustic converter, 25 is a first oscillator that outputs a low level in a frequency band including the resonance frequency of the electro-mechanical-acoustic converter 12, and 26 is A second oscillator controlled by the control unit 32 described below, 2
7 inputs the input to the electro-mechanical-acoustic transducer 12 to a first oscillator 25
And a switch for switching the second oscillator 26, 28 is a frequency detector for detecting the resonance frequency of the electro-mechanical-acoustic transducer 12, 29 is the output voltage of the frequency detector 28 and a preset reference potential A voltage comparison circuit 32 detects a potential difference between the first oscillator 25 and the switch 27 in response to the signal C described in the first embodiment. The frequency detector 28 is similar to the first embodiment,
The circuit element comprises a bridge circuit having a temperature-sensitive resistor.

The operation of the electric-mechanical-acoustic converter configured as described above will be described. First, when the switch 27 is set to the first transmitter 25 side according to an instruction of the control unit 32, the first
Oscillator 25 is oscillated. The oscillation is performed by sweeping a frequency band including the resonance frequency of the electro-mechanical-acoustic transducer 12. The sweep signal is detected by the frequency detector. At the same time, the voltage comparison circuit 29 compares the potential difference between the output voltage of the frequency detector 28 and the reference potential. When the potential difference becomes equal to or higher than the reference potential, the switch 27 is switched to the second oscillator 26 to oscillate the second oscillator 26, and the electro-mechanical-acoustic converter 1
2 and the electric-mechanical-acoustic converter 12 is operated at the oscillation frequency at this time.

Next, the switch 27 is switched to the first oscillator 25 side. The frequency of the sweep signal at that time is higher than the first oscillation frequency. As described above, the sweep signal is detected by the frequency detector 28. At the same time, the voltage comparison circuit 29 compares the potential difference between the output voltage of the frequency detector 28 and the reference potential. When the potential difference exceeds the reference potential, the switch 27 is switched to the second oscillator
Is oscillated and output to the electric-mechanical-acoustic converter 12, and the electric-mechanical-acoustic converter 12 is operated again at the oscillation frequency at this time.

The above operation is repeated. In this way,
The output of the natural resonance frequency by the second oscillator 26 is electric-mechanical-
The electric-mechanical-acoustic transducer 12 is input to the acoustic transducer 12
Is caused to vibrate or sound, so that the resonance frequency can be found very easily, and the operation at this resonance frequency can be performed very easily and quickly as compared with those of the first to sixth embodiments. Is what you can do.

When it is confirmed by the voltage comparison circuit 29 that the resonance point has shifted due to a change in the environment and the potential difference level has decreased, the control unit 32 drives the switch 27 again, and
By switching to the first oscillator 25 and starting from the above-described detection of the initial resonance frequency, it is possible to cope with environmental changes.

(Embodiment 9) Embodiment 9 of the present invention will be described with reference to the block circuit diagram of FIG. In the description, the same parts as in the eighth embodiment will be omitted from description. The difference from the seventh embodiment is that only the oscillation unit 31 is used as the oscillation unit. First, the resonance frequency is detected by the frequency detector 28, and the detection result is notified to the control unit 32 through the voltage comparison circuit 29. Next, the control unit 32 instructs the oscillation unit 31 on the resonance frequency. The oscillating unit 31 oscillates at this resonance frequency so that the electro-mechanical-acoustic converter 12 is sufficiently driven (vibrated and / or sounds). The frequency detector 28 comprises a bridge circuit having a temperature-sensitive resistor in its circuit element, as in the first embodiment.

The detection of the resonance frequency due to a change in the environment and the subsequent oscillation of the resonance frequency are the same as in the operation of the seventh embodiment and will not be described.

With the above configuration, one oscillation means can be reduced, and an electric-mechanical-acoustic converter having a simple circuit configuration can be provided.

Further, by instructing the two resonance frequencies in time division from the control unit 32 to the oscillation unit 31, the oscillation unit 31 can oscillate at the two resonance frequencies in time division. As a result, vibration and sound can be alternately generated from the electric-mechanical-acoustic converter 12. As a result, the number of oscillating means can be reduced to one, and the deviation of the resonance frequency due to an environmental change or the like can be constantly monitored and corrected to maintain a stable resonance state.

Note that the electric-mechanical-acoustic converter described in the seventh and eighth embodiments is an electric-mechanical-acoustic converter 12.
It is also possible to integrate as a microcomputer except for.

Further, in the present embodiment, the electro-mechanical-acoustic transducer is of a conductive type using a magnetic force generated in a voice coil inserted into a magnetic field, but a transducer of a piezoelectric type, an electromagnetic type, etc. The same effect can be obtained by the method.

[0054]

As described above, in the configuration of the electro-mechanical-acoustic converter of the present invention, the fluctuation of the resonance frequency is always detected by the detecting means, and the change in the use environment including the temperature change is prevented.
An extremely stable oscillation output can be efficiently obtained.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of a main part of a portable terminal using an electro-mechanical-acoustic converter according to a first embodiment of the present invention.

FIG. 2 is a block circuit diagram of a main part of a portable terminal using the electro-mechanical-acoustic converter according to the second embodiment of the present invention.

FIG. 3 is a block circuit diagram according to a third embodiment;

FIG. 4 is a block circuit diagram according to a fourth embodiment;

FIG. 5 is a block circuit diagram according to a fifth embodiment;

FIG. 6 is a block circuit diagram according to a sixth embodiment;

FIG. 7 is a block circuit diagram according to a seventh embodiment;

FIG. 8 is a block circuit diagram according to an eighth embodiment.

FIG. 9 is a block circuit diagram according to a ninth embodiment;

FIG. 10 is a block circuit diagram of a conventional electric-mechanical-acoustic converter.

FIG. 11 is a side sectional view of an electric-mechanical-acoustic transducer which is a main part of the same.

FIG. 12 is a diagram showing the same frequency characteristics.

FIG. 13 is a perspective view of a mobile phone equipped with the electric-mechanical-acoustic converter.

[Explanation of symbols]

 Reference Signs List 10 oscillator 11 amplifier 12 electromechanical-acoustic converter 13 frequency detector 16, 21 limiter 19 low-pass filter 20 high-pass filter 25 first oscillator 26 second oscillator 28 frequency detector 31 oscillating unit 32 control unit

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Koichi Kuze 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. Issued on the 25th, PP569-570, (Bridge method) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04R 3/00-3/14 H04R 9/00-9/18 B06B 1/00-3 / 04

Claims (15)

(57) [Claims] 1. A having at least two different mechanical resonance system, so that it can be converted to any of the vibration and the sound input signal
Electrical configured - mechanical - acoustic conversion means, before Symbol electro - mechanical - the frequency band of the signal including at least one of the resonance frequency of the mechanical resonance system of acoustic transducer means, before
Supplied as the input signal of the electric-mechanical-acoustic conversion means
Signal supply means to be used, and the electric-mechanical-acoustic conversion means are used as circuit elements.
Electric impedance element Z1, the electric impedance
The electrical impedance element connected in series with the element Z1;
Electric impedance element having substantially the same temperature characteristics as Z1
Child Z2, series connection of the electric impedance elements Z1 and Z2
Electrical impedances connected in series with the circuit, each connected in series
A pair of dancer elements Z3 and Z4,
Are connected to the electric impedance elements Z1 and Z3.
Point and the contact point between the electric impedance elements Z2 and Z4.
The output is the contact of Z1, Z2 and the contact of Z3, Z4.
Connected to a bridge circuit extracted from a point and the output contact
The electric machine
The mechanical resonance system is shared according to the output of the mechanical-acoustic conversion means.
Detecting a signal of any one of the vibration frequencies,
Frequency detection means for supplying the signal to the signal supply means, and inserted into any position of a closed loop constituted by the electro-mechanical-acoustic conversion means, signal supply means, and frequency detection means
Signal switching means, when the closed loop is closed by the signal switching means,
According to the input signal supplied from the signal supply unit,
The electric-mechanical-acoustic conversion means is initially driven and outputs
In response, a predetermined frequency signal by the front Symbol frequency detecting means
Detected and supplied to the signal supply means,
Before SL electro - mechanical - acoustic transducer means driving at a predetermined resonance frequency
An electro-mechanical-acoustic converter characterized by being operated . 2. Z2, Z constituting said bridge circuit
3, electrical of claim 1, wherein configured electrical impedance Z4 is the circuit element including a resistance component - mechanical - acoustic converter. 3. The electric-mechanical device according to claim 2, wherein at least the electric impedance Z2 connected in series with the electric impedance of the electric-mechanical-acoustic conversion means is a temperature-sensitive resistance element whose resistance value changes with ambient temperature. Sound conversion device. 4. A resistance-temperature characteristic of the temperature sensitive resistive element is the <br/> electro - mechanical - electrical nearly matched claim 3, wherein the resistance-temperature characteristic of the acoustic transducer means - mechanical - acoustic converter. 5. The signal supply means according to claim 1 , wherein:
2. The electro-mechanical-acoustic converter according to claim 1 , wherein the electro-mechanical-acoustic converter is an amplifying means for amplifying the input signal of the electronic device. Wherein said amplifying means, the noise originating <br/> producing an electrical circuit system including at least one of the previous SL amplifying means and before Symbol frequency detection means, amplifying an input signal of said amplifying means
The electrical-mechanical-acoustic converter according to claim 5 . As 7. input signal of said amplifying means, before Symbol electro - mechanical - oscillation means for oscillating an electric signal in the frequency band including the resonance frequency of the mechanical resonance system of acoustic transducer means, before
The electro-mechanical-acoustic converter according to claim 5, wherein the electro-mechanical-acoustic converter is connected to the outside of the closed loop . Wherein said frequency detection means, at least one of the mechanical resonance system to immediately Bei a low pass filter or a high pass filter or a band pass filter passes the resonance frequency of claim 1 according electro - mechanical - acoustic converter. 9. Before SL electrical of claim 6 or 7, wherein the insertion of the limiter for limiting the output of the previous SL-frequency detection means to the output side of the frequency detecting means - mechanical - acoustic converter. 10. A antenna for receiving an incoming signal, the received signal processing means for outputting an electric signal before Symbol incoming signal to the signal processing by the electric signal into a vibration and sound
Claim 1, 8 or 9, wherein the electro - mechanical - portable terminal composed of the acoustic transducer <br/>. 11. reception signal and an antenna for receiving an incoming signal, a reception signal processing means for pre-Symbol incoming signal a signal processing and outputs the reception signals and electrical signals, before Symbol electrical signal
10. The method according to claim 1, 8 or 9 for converting into vibration and sound.
Mounting the electro - mechanical - portable terminal composed of the acoustic converter
A is, before Symbol electro - mechanical - acoustic transducer is the reception signal
A portable terminal having a function of reproducing a number . 12. It has at least two different mechanical resonance systems, and converts the first or second electric signal into vibration and sound .
Constructed electrically as to a possible transformation - mechanical - acoustic transducer
Means, a first oscillation means that oscillates a pre Symbol first electrical signal of the frequency band, and outputs before Symbol electric over mechanical chromatography acoustic transducer means <br/> including a resonance frequency of the mechanical resonance system, the a first electrical signal and the prior SL second electrical signal oscillates,
Detecting the output level of the acoustic transducer means - before Symbol electro - mechanical - a second oscillating means for outputting the acoustic transducer means, before Symbol electro - mechanical
And frequency detection means according to claim 1, comparison means and, when the output level becomes equal to or higher than the reference level, before Symbol electrical oscillating pre Symbol detected frequency for comparing the output level and the reference level - machinery - electrical and a control means for controlling the pre-Symbol second oscillation means so as to output the sound converting means <br/> - mechanical - acoustic converter. 13. It has at least two different mechanical resonance systems , and can convert an electric signal into both vibration and sound .
Uni configured electrical - mechanical - oscillated acoustic converting means, the electric signal <br/> No. of frequency band including the resonance frequency of the mechanical resonance system, before Symbol electro - mechanical - before Symbol electrical signal into an acoustic conversion means and oscillating means for outputting, prior Symbol electro - mechanical - frequency detecting means of claim 1, wherein it detects the frequency with a preset output level of the acoustic transducer means, when pre-Symbol electricity by division - mechanical - acoustic Machine for conversion means
Constituted by a control means for controlling the vibration system before Symbol oscillation means so as to oscillate in the previous SL oscillating means the detected frequency as a resonant frequency oscillation before Symbol frequency detection means of the frequency band of the frequency signal including a resonance frequency of the Electrical-mechanical-acoustic converters. 14. The oscillating means, before Symbol electro - be swept from the high-frequency or high-frequency frequency band including the resonance frequency of the mechanical resonance system of the acoustic transducer means from low frequency to a low frequency - machinery
Claim 1 which is possible to output the electric signal that was configurable
3. The electric-mechanical-acoustic converter according to 3 . 15. The electric machine as claimed in claim 15, wherein the first oscillating means comprises:
Frequency including resonance frequency of mechanical resonance system of machine-acoustic conversion means
Switch several bands from low frequency to high frequency or high frequency to low frequency.
Construction and capable of outputting a first electrical signal-loop
An electro-mechanical-acoustic converter according to claim 12 .