JP2002044771A - Handset - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a handset capable of detecting the vibration of a vocal cords and achieving improvement of vocal clearness even though the vibration is small. SOLUTION: In the handset, a vibration detecting surface 17 of a case 10 contacted to a throat part is formed with thin-walled flexible plastic and also projections 12a-12d for vibration transmission formed in one body with the surface 17 are pressed to a piezoelectric element 11, furthermore the element 11 is installed into the case 10 in such way that spaces are created at both side of the element 11. Even though the vibration is small, the handset allows a detecting of the vibration to transfer it to the element 11, and also allow precise responses of the element 11 to the vibration transferred through the projections 12a-12d.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handset which is detachably connected to, for example, a portable telephone, and more particularly, to a handset provided with a throat microphone which detects vibration of a vocal cord and converts it into a voice signal. .

[0002]

2. Description of the Related Art A throat microphone detects vibration of a vocal cord through contact with the throat and converts it into a voice signal.
Only an audio signal can be transmitted without being affected by ambient noise or the like. In a conventional microphone of this type, for example, a piezoelectric element is provided by bonding one surface of the piezoelectric element to a circuit board or the like, and a spring is interposed between the case surface that contacts the throat and the piezoelectric element. The vibration of the surface is transmitted to the piezoelectric element via a spring.

[0003]

However, in such a throat microphone, one surface of the piezoelectric element is adhered, and the vibration is transmitted to the piezoelectric element by a spring, so that the vibration of the piezoelectric element is hindered. Not only that, the vocal cords, particularly minute vibrations, are absorbed by the springs, and there is a possibility that clear voice cannot be given when the vibrations of the vocal cords are small.

[0004] The present invention has been made based on the above-described viewpoint, and an object of the present invention is to be able to reliably detect the vibration of a vocal cord even when the vibration is small, and to improve the clarity of voice. To provide a handset.

[0005]

According to the present invention, there is provided a throat microphone which is mounted so as to be in contact with the throat, wherein the throat microphone has a vibration detecting surface which comes into contact with the throat, and at least the vibration detecting surface is provided. The case where the surface side is formed of a soft resin and the vibration detection surface is formed so as to be thin so as to be able to detect minute vibrations of the vocal cords, and the case where the spaces are formed on both sides. And at least one projection for vibration transmission whose free end is pressed against one surface of the piezoelectric element, the projection being formed integrally with the vibration detection surface on the inner surface of the vibration detection surface of the case. The above object is achieved by a handset having the following.

According to such a configuration, the vibration detecting surface of the case which comes into contact with the throat portion is formed of thin soft resin, and the vibration of the vibration detecting surface is directly transmitted to the piezoelectric element by the vibration transmitting projection. Therefore, even if the vibration of the vocal cords is small, the vibration can be reliably transmitted to the piezoelectric element. In addition, since the piezoelectric element is housed in the case so that a space is formed on both sides, the easiness of vibration of the piezoelectric element is improved, and the piezoelectric element accurately responds to the vibration transmitted through the vibration transmitting projection. be able to.

[0007]

FIG. 1 is a plan view showing an embodiment of a handset according to the present invention. In this embodiment, the present invention is applied to a portable telephone.

In FIG. 1, 1 is a mounting arm, 2 is a throat microphone, 3 is an earphone, 4 is an outgoing / incoming switch, 5
Is a module plug. The mounting arm 1 has an elastic C-shape, and can be detachably mounted on the neck of the caller. The throat microphone 2 is attached to one end 1a of the mounting arm 1 such that when the mounting arm 1 is mounted on the neck of the caller, a later-described vibration detection surface 17 of the microphone 2 contacts the throat of the caller. Is provided. Further, one end portion 1a of the mounting arm 1 has a tongue 6 extending in the circumferential direction, so that when the mounting arm 1 is mounted on the neck of the talker, the tongue 6 and the neck of the talker are connected. A gap is formed so that a finger can be put on the space. The other end portion 1b of the mounting arm 1 is formed so as to warp outward, and when the mounting arm 1 is mounted on the neck of the caller,
A gap is formed between the other end portion 1b and the neck of the caller so that a finger can be put on the neck. in this way,
In this example, the mounting arm 1 is mounted on the neck of the caller.
Since a gap is formed on one end side and the other end side where a finger can be put, it is not necessary to select one end side or the other end side when the mounting arm 1 is removed. Becomes extremely easy. The code 7 of the throat microphone 2 and the code 8 of the earphone 3
Is connected to the module plug 5 through the locking by the cord locking portion 9 provided in the module plug 5. The call switch 4
A switch that can put the mobile phone in the receiving state by pressing it when receiving an incoming call, and put it in the outgoing state by pressing when the other party number is set in the mobile phone. Connected to plug 5. The module plug 5 is configured to be detachably connected to a module connector of a mobile phone (not shown).

FIG. 2 is a sectional view showing the configuration of the throat microphone 2 of FIG. 1, FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG. 4 is a sectional view taken along line BB of FIG. In these figures, 10 is a case, 11 is a piezoelectric element, 12a, 12b, 12c, 12d.
Denotes a vibration transmitting projection, and 13 denotes a processing circuit.

The case 10 has a first case member 14 and a second case member 15 in the shape of a circular container.
The piezoelectric element 11 and the processing circuit 13 are stored in a storage chamber 16 formed by the case members 14 and 15. First
At least the second case member 15 of the second case members 14 and 15 is formed of a soft resin such as urethane resin, and the vibration detection surface of the second case member 15 having a closed end surface formed to be thin. 17. As shown in FIG. 1, the case 10 has the first case member 14 side fixed to one end 1a of the mounting arm 1 and the second case member 15 when the mounting arm 1 is mounted on the neck of the talker.
Is in contact with the throat of the caller. The vibration detecting surface 17 has a thickness of 0.4 m in this example.
m so that the second case member 15 can be accurately responded to minute vibration of the throat, that is, minute vibration of the vocal cords, in combination with the fact that the second case member 15 is formed of a soft resin. It has become.

The piezoelectric element 11 has a disk shape, and an upper electrode 11a which is one electrode is a lower electrode 11a which is the other electrode.
It has a larger diameter than b. The upper surface and lower surface of the piezoelectric element 11 are formed by holding the circumferential portion of the large-diameter upper electrode 11 a on the holding surface 15 a formed on the inner surface of the second case member 15. Are housed in the second case member 15 so that a space is formed in the second case member 15. This facilitates the vibration of the piezoelectric element 11 in combination with the fact that the piezoelectric element 11 is held only by the upper electrode 11a. The lead wire 18 of the lower electrode 11b of the piezoelectric element 11 is connected to the piezoelectric element 1 as shown in FIGS.
1 is drawn out to the upper surface side of the piezoelectric element 11 through a lead groove 19a or 19b formed on the inner surface of the second case member 15 so as to communicate the lower surface side and the upper surface side. In this example, since two lead grooves 19a and 19b are formed, the piezoelectric element 11
Can be easily assembled.

The vibration transmitting projections 12a to 12d are formed on the inner surface of the vibration detecting surface 17 so as to be integrally formed with the vibration detecting surface 17, and have a circumference concentric with the center of the vibration detecting surface 17, as shown in FIG. It is provided at an angular interval of 90 degrees above. When the piezoelectric element 11 is placed on the holding surface 15a of the second case member 15, the vibration transmitting projections 12a to 12d
The lower electrode 11b contacts the vibration transmitting projections 12a to 12d, and the circumferential portion of the upper electrode 11a of the piezoelectric element 11 is only slightly (for example, about 0.05 mm) from the holding surface 15a.
It is formed so as to be in a floating state. Thereby, when the circumferential portion of the upper electrode 11a of the piezoelectric element 11 is bonded to the holding surface 15a of the second case member 15 as described later, the free ends of the vibration transmitting projections 12a to 12d The lower electrode 11b is brought into pressure contact with the lower electrode 11b. From the viewpoint of transmitting the vibration of the vibration detection surface 17 more reliably, the vibration transmission protrusions 12a to 12d
It is desirable to form it thinly.

Between the circumferential portion of the upper electrode 11a of the piezoelectric element 11 and the holding surface 15a of the second case member 15,
The vibration transmitting projections 12a to 12d and the lower electrode 11b of the piezoelectric element 11 are bonded with an elastic non-hardening adhesive 20 such as a silicon adhesive. for that reason,
Since the piezoelectric element 11 is held on the holding surface 15a of the second case member 15 via elasticity, the vibration of the piezoelectric element 11 is facilitated, and the vibration transmitting projections 12a to 12a are formed.
Since the contact 12d and the piezoelectric element 11 are always kept in contact with each other without being separated during the transmission of vibration, the vibration of the vibration detection surface 17 can be transmitted to the piezoelectric element 11 more accurately.

The processing circuit 13 is mounted on a surface of the circuit board 21 provided on the open end face side of the first case member 14 facing the piezoelectric element 11, and the lead wire 1 of the piezoelectric element 11
The detection output of the piezoelectric element 11 is input via the reference numerals 8 and 22, and an audio signal is supplied to a portable telephone (not shown) via the cord 7 and the module plug 5. A metal layer 23 such as a copper foil for shielding is formed on the surface of the circuit board 21 opposite to the surface on which the processing circuit 13 is mounted, and shields high frequency noise from the outside. The processing circuit 13 has a circuit configuration as shown in FIG.

FIG. 5 is a circuit diagram showing an example of the processing circuit 13 shown in FIG. 2, and those having the same reference numerals as those in FIGS. 1 and 2 indicate the same components. The processing circuit 13 includes the impedance conversion resistor 3
0, a high frequency component removing circuit 31, a bias circuit 32, an amplifying circuit 33, and a low frequency noise removing circuit 34.

The impedance conversion resistor 30 is inserted in parallel with the piezoelectric element 11, converts the detection output of the piezoelectric element 11 into a low impedance, and converts the detected output into a high frequency component removing circuit 31.
Give to. The high-frequency component removing circuit 31 has a resistor 31 a and a capacitor 31 b, cuts a high-frequency component higher than an audible frequency included in a detection output of the piezoelectric element 11, and supplies the cut-off frequency to an amplifier circuit 33 via a bias circuit 32. The bias circuit 32 includes a DC cut capacitor 32a and bias resistors 32b, 32c, and 32d. The bias circuit 32 prevents a DC voltage from being applied to the piezoelectric element 11 by a bias current. Is set. The amplification circuit 33 includes transistors 33a and 33b, gain adjustment resistors 33c and 33d, and a resistor 33e.
The detection output of the piezoelectric element 11 is amplified, and the output / power supply terminal 5 of the module plug 5 is
a is given an audio signal. The amplifying circuit 33 has an automatic gain adjusting function using the gain adjusting resistors 33c and 33d, so that distortion is not generated in the audio signal even when the detection output level of the piezoelectric element 11 becomes excessive for some reason. And a clear audio signal can be given. Note that the resistor 33e is a resistor related to the bias setting. The low frequency noise removal circuit 34
A first filter including a first capacitor 34a and a resistor 34b, and a second capacitor 34c and a choke 34d.
And a second filter having a second filter for removing low frequency noise from outside. Low frequency noise removal circuit 3
4 has a two-stage filter and uses the choke coil 34d as the second filter, so that the attenuation characteristics for low frequencies are increased, and low-frequency noise can be removed very effectively. .

The earphone 3 is connected to an earphone terminal 5b of the module plug 5, and the transmission / reception switch 4 is connected to a transmission / reception terminal 5c of the module plug 5. The terminal 5d of the module terminal 5 is a ground terminal.

In the handset having such a configuration, the module plug 5 is connected to the module connector of the portable telephone,
The mounting arm 1 is mounted on the neck of the caller such that the throat microphone 2 contacts the throat of the caller, and the earphone 3 is set on the ear of the caller. When the caller utters, the vibration of the vocal cords is generated by the vibration detection surface 17 of the throat microphone 2.
Is detected by the vibration transmitting projection 1
It is transmitted to the piezoelectric element 11 through 2a to 12d. As described in the description of the configuration, since the vibration detecting surface 17 is formed of a thin soft resin, even if the vibration of the vocal cords is small, the vibration detecting surface 17 accurately responds, and the vibration is integrated with the vibration detecting surface 17 for vibration transmission. It is transmitted to the piezoelectric element 11 via the protrusions 12a to 12d. The vibration transmitting projections 12a to 12d are
Since the piezoelectric element 11 is held so as to be extremely easily vibrated, the vibration of the vibration detecting surface 17 is accurately detected and given to the processing circuit 13. . The processing circuit 13 removes high-frequency components above the audible frequency of the detection output of the piezoelectric element 11 and performs automatic gain adjustment on the level of the detection output of the piezoelectric element 11 to remove low-frequency noise. The signal is given to the mobile phone as an audio signal via the mobile phone. Therefore, in the hands-free state, even if the vibration of the vocal cords is small, a clear voice can be transmitted to the other party, and the vibration of the vocal cords is converted into an audio signal, so that it is not affected by ambient noise and the like. .

When the user removes his / her neck from the neck at the end of the call, a gap is formed on one end and the other end of the mounting arm 1 so that a finger can be put on at least one of the gaps. And can be easily removed. That is, when removing the mounting arm 1, it is not necessary to select one end side or the other end side, and the mounting arm 1 can be removed very easily.

In the example described above, four vibration transmitting projections 1 are provided.
Although 2a to 12d are provided, it goes without saying that one may be provided. In the case where a plurality of vibration transmitting projections are provided as in this example, even if the height of the vibration transmitting projections varies due to manufacturing variations, it is more likely that at least one of the projections comes into pressure contact with the piezoelectric element 11, thereby improving the yield. Can be done. Further, in this example, the application to the mobile phone has been described as an example, but the invention is not limited to this, and it is needless to say that the invention can be applied to other communication devices and the like. In addition, the throat microphone 2 and the cord locking portion 9 fixed to the mounting arm 1 are configured to be detachable, and the dimensions are determined according to the case where the mounting arm is damaged or the neck size, use place, mood, etc. of the person using the handset. It may be possible to replace the mounting arm with another mounting arm having a different shape, color and color.

[0021]

As described above, according to the present invention, the vibration detecting surface of the case which comes into contact with the throat is formed of a thin soft resin, and the vibration transmitting surface formed integrally with the vibration detecting surface. The projections are configured to press against the piezoelectric element, and the piezoelectric element is housed in the case so that a space is formed on both sides, so even if the vibration of the vocal cords is small, the vibration can be detected. To the piezoelectric element, and the piezoelectric element can accurately respond to the vibration transmitted through the vibration transmitting projection. Further, since the vibration transmitting projection is formed integrally with the vibration detection surface, it is not necessary to prepare a separate component, and the number of components can be reduced.

Further, since the piezoelectric element is held by an elastic non-hardening adhesive, the piezoelectric element is held in the case via the elasticity, and the easiness of vibration of the piezoelectric element is improved. In addition, the response of the piezoelectric element to transmitted vibration can be improved.

Also, one electrode of the piezoelectric element is made larger than the other electrode, and the piezoelectric element is held on the holding surface of the case via the large electrode, so that the vibration of the piezoelectric element can be reduced. Easiness can be improved.

Further, a processing circuit for processing the detection output of the piezoelectric element includes a high-frequency component removal circuit for removing a high-frequency component of the detection output of the piezoelectric element, an amplification circuit having a gain adjustment resistor, a first capacitor and a resistor. A first filter according to
Since the low-frequency noise removing circuit having the two-stage configuration including the second capacitor and the second filter including the choke coil is included, a clearer audio signal can be provided.

Further, since a metal layer for shielding is formed on the other surface of the circuit board on which the processing circuit is mounted, external high-frequency noise can be effectively prevented.

Furthermore, since the gap is formed at one end and the other end of the mounting arm when the mounting arm is worn on the neck of the talker, one end or the other end is formed when the mounting arm is removed. There is no need to select the side, and the handset can be easily removed.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of an embodiment of a handset according to the present invention.

FIG. 2 is a sectional view showing a configuration of the throat microphone of FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a circuit diagram illustrating an example of a processing circuit of FIG. 2;

[Explanation of symbols]

 Reference Signs List 1 mounting arm 1a one end of mounting arm 1b other end of mounting arm 2 throat microphone 6 tongue 10 case 11 piezoelectric element 11a upper electrode (one electrode) 11b lower electrode (other electrode) 12a, 12b, 12c, 12d Vibration transmitting projection 13 Processing circuit 15a Holding surface 17 Vibration detection surface 20 Adhesive 21 Circuit board 23 Metal layer 31 High frequency component removing circuit 33 Amplifying circuit 33c, 33d Gain adjusting resistor 34 Low frequency noise removing circuit 34a First capacitor 34b Resistance 34c 2nd capacitor 34d choke coil

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04R 1/10 104 H04R 1/10 104Z 5K027 1/46 1/46 3/00 320 3/00 320 17 / 02 17/02 F term (reference) 5D004 CD01 CD07 DD03 FF04 FF06 FF10 5D005 BA06 BA13 BA14 5D017 BF03 5D020 BB07 5K023 AA07 BB06 EE07 EE16 NN06 QQ05 RR08 5K027 AA11 BB03 DD11 HH03 KK07

Claims (6)

[Claims] 1. A throat microphone which is mounted so as to be in contact with a throat portion, wherein the throat microphone has a vibration detection surface which comes into contact with the throat portion, and at least a side of the vibration detection surface is formed of a soft resin. A case in which the vibration detection surface is formed so as to be able to detect a minute vibration of a vocal cord, a piezoelectric element housed in the case such that spaces are formed on both sides, A transmitter / receiver having at least one vibration transmitting projection formed on an inner surface of the vibration detection surface of a case integrally with the vibration detection surface and having a free end pressed against one surface of the piezoelectric element. 2. The method according to claim 1, wherein the case has a holding surface for holding a peripheral portion of the piezoelectric element, and a non-elastic member is provided between the holding surface and the piezoelectric element and between the vibration transmitting member and the piezoelectric element. 2. The handset according to claim 1, wherein the handset is bonded with a hardening adhesive. 3. The transmission device according to claim 2, wherein one electrode of the piezoelectric element is larger than the other electrode, and the piezoelectric element is held on the holding surface via the one electrode. Handset. 4. A processing circuit for receiving a detection output of the piezoelectric element and outputting an audio signal is housed in the case, and the processing circuit removes a high frequency component of the detection output of the piezoelectric element. An elimination circuit; an amplification circuit having a gain adjustment resistor; a first filter including a first capacitor and a resistor;
2. The handset according to claim 1, further comprising a low-frequency noise removing circuit having a two-stage configuration including a capacitor and a second filter including a choke coil. 5. The handset according to claim 4, wherein the processing circuit is mounted on one surface of a circuit board, and a metal layer for shielding is formed on the other surface of the circuit board. 6. The mounting arm, wherein the throat microphone is provided at one end of a substantially C-shaped mounting arm having elasticity, and a tongue is extended at one end of the mounting arm provided with the throat microphone. Is formed between the tongue and the neck of the talker when the wearer is attached to the neck of the talker, and the other end of the mounting arm is formed so as to warp outward. And
2. The handset according to claim 1, wherein a gap is formed between the other end of the mounting arm and the neck of the talker when the wear arm is worn around the neck of the talker.