JP4195582B2 - Microphone, mobile phone having a microphone, and desk phone - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a microphone for inputting voice information and converting it into an electric signal, a mobile phone having a microphone, and a desk phone.
[0002]
[Prior art]
As shown in FIG. 11, the conventional general microphone includes, as basic elements, a microphone body 11, a microphone circuit board 26 on which the microphone circuit 21 is mounted, a cable 31, a case 43 that covers the outer periphery, and the microphone body 11. The front case 41 is made of a mesh material covering the opening.
[0003]
In the conventional microphone, the front case 41 as the opening is directed to the sound source in order to pick up information such as sound. The microphone body 11 receives the air vibration propagating from the sound source via the mesh-like front case 41. Thereafter, the microphone body 11 converts air vibration into electric vibration. Then, the microphone circuit 21 connected to the microphone main body 11 performs processing such as impedance conversion, and transmits it to a predetermined device (not shown) via the cable 31 to be connected. The microphone detects and transmits the signal of the sound source through such a series of processes.
[0004]
[Problems to be solved by the invention]
However, the conventional microphone converts and detects all the air vibrations reaching the microphone main body 11 into an electric signal, and cannot separate and select a signal to be picked up and a signal not to be picked up. For this reason, when the microphone is dropped during use or when the microphone collides with an object, the microphone picks up a very large impact sound (noise) and emits a large impact sound from the connected speaker. In addition, if a hand slips while a call is being made using a mobile phone, or the mobile phone is dropped, or if the mobile phone collides with an object, a large impact sound (noise) will be transmitted to the other party. Discomfort to the other party.
[0005]
Furthermore, recent mobile phones that have been reduced in size and weight have a very high microphone sensitivity because the user's mouth is separated from the microphone portion of the mobile phone. Therefore, for example, when talking while walking, the mobile phone and the head near the ear come into contact, and the rubbing sound is picked up by the microphone unit and transmitted to the communication partner. Further, when the mobile phone is squeezed strongly, the case of the mobile phone main body is distorted and emits a squeaking sound and the like, and the squeaking sound is picked up by the microphone unit and transmitted to the communication partner. Similarly, in a desk phone used at home or in the office, a loud impact sound is transmitted to the communication partner by dropping the handset or dropping the phone together with the telephone call. Gives discomfort.
A prior art aiming to solve this problem is disclosed in, for example, Japanese Patent Laid-Open No. 59-40798. In the prior art described in this publication, a vibration sensor attached to the microphone main body detects external vibration and performs suppression corresponding to the magnitude of the output signal of the microphone main body.
However, in this prior art, a vibration sensor is attached to the microphone body, the microphone body is held via a case and a vibration damper, and the vibration sensor output is reduced to a noise via an AC-DC converter. Because it is configured to change the output level of the microphone body corresponding to the noise level, the impact of the damper will be affected by the impact detection, the vibration sensor installation position will be fixed, and the noise reduction including the AC-DC converter There is a problem that the apparatus is complicated and expensive.
[0006]
The present invention has been made to solve such problems, and a microphone, a mobile phone, and a desk phone that block an impact sound even when an impact is applied and do not cause discomfort to a communication partner or an audience. The purpose is to provide.
[0007]
[Means for Solving the Problems]
A microphone according to the present invention is a microphone that inputs audio information and converts it into an electric signal, and converts the input audio information into an electric signal. The Conversion means for outputting (for example, the microphone main body 11 and the microphone circuit 21 in the embodiment of the present invention), a case for housing the conversion means, and a case spaced apart from the conversion means and disposed in the case, Via vibration transmission member A fixed vibration sensor and an output blocking means for inputting a signal output from the conversion means and blocking the output of the input signal based on the vibration detected by the vibration sensor (for example, the output blocking circuit in the present embodiment) 23). Furthermore, the vibration transmission member includes a bush formed of a metal material and disposed in contact with the case, and a circuit board on which the output blocking means is mounted. With such a configuration, even when an impact is applied to the microphone when the microphone is dropped, transmission and transmission of the impact sound are effectively blocked, and the user is not uncomfortable.
[0008]
Here, it is preferable that the output shut-off means shuts off the output of the input signal when the vibration detected by the vibration sensor is equal to or greater than a predetermined value.
[0009]
It is desirable that the vibration sensor is attached at a position where the impact force applied to the case body is directly transmitted. Thereby, the impact sound generated by the impact force applied to the case body can be effectively blocked. In particular, squeak noise generated in the case body can be effectively blocked.
The vibration sensor in a preferred embodiment is configured using a piezoelectric element.
[0010]
The piezoelectric element may be configured so that one end is a free end, the other end is fixed, and vibration is detected based on a signal generated in an electrode provided in the piezoelectric element. With this configuration, vibration applied to the microphone can be accurately detected with a simple configuration.
[0011]
And an element substrate having a wiring pattern; and a conductive member that contacts the first surface at the other end of the piezoelectric element and fixes the piezoelectric element to the element substrate. Vibration is detected on the basis of a signal acquired from the first surface via the support member and the wiring pattern on the element substrate and a signal acquired from the second surface opposite to the first surface. It is better to With such a configuration, since the mechanical structure and the electrical configuration are performed simultaneously, the configuration can be simplified and the cost can be reduced.
[0012]
The vibration sensor includes one end fixed, a weight at the other end, a conductive elastic member, and an electrode material provided to face the elastic member, and in a steady state, the elastic member It is preferable that the electrode member is separated and the elastic member and the electrode member are electrically connected in a state where an impact is applied to detect vibration. With such a configuration, the vibration sensor can be configured more easily and at a low price.
[0013]
The above-described microphone is typically used in a mobile phone or a desk phone.
[0014]
A mobile phone according to the present invention is disposed in a case that covers an outer periphery, a microphone that is disposed in the case, converts input voice information into an electrical signal, and is output, and is separated from the microphone. The case Via vibration transmission member A fixed vibration sensor; and an output blocking unit configured to input a signal output from the microphone and block an output of the input signal based on the vibration detected by the vibration sensor. Furthermore, the vibration transmission member includes a bush formed of a metal material and disposed in contact with the case, and a circuit board on which the output blocking means is mounted. With such a configuration, it is possible to block squeaking noise and sliding noise.
[0015]
A desk phone according to the present invention is a desk phone having a handset, and the handset is a case, a microphone that converts input audio information into an electric signal and outputs the signal, and a case spaced apart from the microphone. Placed in the body, said Via a vibration transmission member A fixed vibration sensor; and an output blocking unit configured to input a signal output from the microphone and block an output of the input signal based on the vibration detected by the vibration sensor. Furthermore, the vibration transmission member includes a bush formed of a metal material and disposed in contact with the housing, and a circuit board on which the output blocking means is mounted. With such a configuration, even when an impact is applied to the handset when the handset is dropped, the generation of impact sound can be effectively blocked.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 of the Invention
The present invention can be applied to microphones for various purposes such as microphones for picking up voices of familiar karaoke and mobile phones, and microphones for recording and broadcasting conferences and events. In Embodiment 1 of the present invention, an example applied to a microphone for karaoke will be described in detail with reference to the drawings.
[0017]
An example of a microphone 10 with an output cutoff device according to an embodiment of the present invention is shown in the block diagram of FIG. 1 and the structural diagram of FIG.
[0018]
As shown in FIGS. 1 and 2, the microphone 10 with an output cutoff device of the present invention includes a microphone body 11, a circuit board 26 on which a microphone circuit unit 21 and an output cutoff device 22 are mounted, a cable 31, and a front case 41. And a case stopper 42, a case main body 43, a bush 44, and the like. The output shut-off device 22 is attached to the case main body 43 via the circuit board 26 and the bush 44, and is attached to a position where the impact force applied to the case main body 43 is directly transmitted. Note that, unlike the vibration damper, the bush is made of a material having high hardness such as aluminum or brass. As shown in FIG. 1, the output signal of the microphone body 11 is input to the microphone circuit unit 21. The output signal of the microphone circuit 21 is input to the output cutoff device 22. The output signal of the output shut-off device 22 is output to an external device via the cable 31.
[0019]
The structure and function of each part will be described in detail below.
First, the microphone body 11 will be described.
The microphone main body 11 employs, for example, an electret condenser microphone, and ensures high sensitivity characteristics.
[0020]
This electret condenser microphone is highly sensitive and inexpensive as a sensor that changes air vibration into electric vibration, and is widely used for audio.
[0021]
The microphone body 11 is covered with a front case 41 as shown in FIG. The front case 11 is made of a mesh-like material or a mesh-shaped member through which air vibrations can pass freely, and protects the precise pick-up portion from the intrusion and collision of dust and foreign matter. The function of the microphone main body 11 is to receive the air vibration that has passed through the front case 41, convert the air vibration into an electric signal, and output it to the output terminals 11A and 11B.
[0022]
Further, the output of the microphone main body 11 appearing at the output terminals 11A and 11B is transmitted to the connected microphone circuit 21.
[0023]
Next, the microphone circuit 21 will be described.
As shown in FIGS. 1 and 2, the microphone circuit 21 is connected to the output terminals 11 </ b> A and 11 </ b> B of the microphone body 11. The microphone circuit 21 receives a signal detected by the microphone body 11, performs processing such as impedance conversion and amplification, and transmits the signal to the connected output cutoff device 22 via its output terminal.
[0024]
By the operation of the microphone circuit 21, the output signal is transmitted to the output cutoff device 22 and the like as a microphone signal that is not easily affected by an electrical disturbance.
[0025]
Next, the output cutoff device 22 will be described.
As shown in FIG. 2, the output cutoff device 22 includes a vibration sensor 24 and an output cutoff circuit 23. The output shut-off device 22 inputs a microphone signal from the microphone circuit 21 as shown in FIGS. In a normal state, the microphone signal input to the output cutoff device 22 is output as it is. On the other hand, if the user accidentally drops the microphone 10 or causes an object to collide with the microphone 10, the microphone 10 may receive an impact.
[0026]
In this case, the output blocking device 22 operates to block the influence of the impact on the signal terminal 31A of the cable 31 to be connected.
[0027]
Hereinafter, the configuration and operation will be described in detail.
First, the configuration of the vibration sensor 24 will be described.
As shown in FIG. 3, the vibration sensor 24 includes a piezoelectric element 51 made of a piezoelectric ceramic material such as PZT. Electrodes are formed on both surfaces 51A and 51B of the piezoelectric element 51. One end of the piezoelectric element 51 can be freely moved by an external force, and the other end is fixed to the element substrate via a support member 52. The support member 52 is a member for supporting the piezoelectric element 51 and is made of, for example, a conductive material such as copper. One electrode 51 A of the piezoelectric element 51 and the gate of the field effect transistor 54 are electrically connected by a wire 53. The source of the field effect transistor 54 is connected to the support member 52 through the circuit pattern of the element substrate 55.
[0028]
Since the support member 52 is made of a conductive material, the source of the field effect transistor 54 and the electrode 51B of the piezoelectric element 51 are electrically connected. Since the support member 52 in such a configuration has a mechanical and spatial position holding function and an electrical connection function, the configuration can be simplified. The element substrate 55 fixes components such as the piezoelectric element 51, the support member 52, the wire 53, and the field effect transistor 54. The entire element substrate 55 is electromagnetically covered with shield cases 56A and 56B.
[0029]
Next, the operation of the vibration sensor 24 will be described.
For example, when the microphone 10 with the output shut-off device is dropped and the floor and the case main body 43 collide violently, an impact force accompanying the collision is generated at the collision portion of the case main body 43. This impact force propagates through the case body 43 and is transmitted to the circuit board 26 via the bush 44 that is in close contact with the case body 43.
[0030]
Since the output blocking device 22 described above is configured on the circuit board 26, the impact force transmitted to the circuit board 26 is further transmitted from the circuit board 26 to the vibration sensor 24 of the output blocking device 22.
[0031]
That is, the impact force is transmitted to the shield case 56 </ b> A that covers the outer periphery of the vibration sensor 24, is further transmitted to the closely-contacted element substrate 55, and is transmitted to the piezoelectric element 51 through the element substrate 55 and the support member 52.
[0032]
Since the piezoelectric element 51 is fixed to the element substrate 55 at the position of the support member 52, the piezoelectric element 51 receives an impact force from the fixing portion of the support member 52, and causes vibration corresponding to the impact force in the direction indicated by an arrow A in FIG. At this time, the piezoelectric element 51 generates a signal corresponding to the vibration between the electrode surfaces 51A and 51B. A signal generated on the electrode surface 51A is transmitted to the gate of the field effect transistor 54 through the connected wire 53. The signal generated on the electrode surface 51B is transmitted to the source of the field effect transistor 54 via the circuit pattern of the element substrate 55.
[0033]
The field effect transistor 54 performs impedance conversion, amplification and the like on the transmitted signal and outputs it to its output terminal. This output is transmitted to the output cutoff circuit 23 to be connected as an output signal of the vibration sensor 24 via the signal line of the cable 57 to be connected. At this time, since the entire vibration sensor 24 is shielded electromagnetically, it is difficult to be influenced by surrounding electrical noise and the like, and a high-quality detection signal can be obtained.
[0034]
Next, the configuration of the output cutoff circuit 23 and the operation during normal operation will be described.
As shown in the circuit diagram of FIG. 4, the output cutoff circuit 23 includes, for example, an amplification unit 23B and an output cutoff unit 23C. In FIG. 4, reference numeral 23 </ b> A is a sensor unit for the vibration sensor 24.
[0035]
The amplifying unit 23B includes a connection capacitor C1, bias resistors R3 and R4, a transistor Tr1, an emitter resistor R5 of Tr1, and a collector resistor R6 of Tr1. The function of the amplifying unit 23B is to receive the output signal of the vibration sensor 24, amplify it to a predetermined magnitude, and transmit it to the output blocking unit 23C via the capacitor C2.
[0036]
The output cut-off unit 23C includes a connection capacitor C2, bias resistors R7 and R8, a transistor Tr2, a resistor R9 connected to the collector of Tr2, a capacitor C3, a resistor R10, and the other end of the resistor R10 at its base. It comprises a transistor Tr3 to be connected and a resistor R11 connected to the collector of Tr3. The emitter of the transistor Tr2 is grounded, and the emitter of the transistor Tr3 is grounded via a resistor R12.
[0037]
When considering the gain and signal polarity of the transistor Tr3, the output terminal 23H may be connected to the emitter of the transistor Tr3 as shown in the circuit diagram of FIG.
[0038]
Now, the steady state operation of the output cutoff circuit 23 will be described with reference to FIG.
In a quiet state where no impact is received, that is, in a steady state, the vibration sensor 24 outputs a signal corresponding to the steady state, the steady output is received by the amplifying unit 23B, amplified to a predetermined magnitude, and passed through the capacitor C2. This is transmitted to the output cutoff unit 23C. At this time, the transistor Tr2 of the output cut-off unit 23C is in a cutoff condition even with a signal obtained by combining the bias conditions by the bias resistors R7 and R8 and the signal from the vibration sensor 24 transmitted through the capacitor C2, and does not operate. Therefore, the transistor Tr3 is in an operating state under the conditions set by the resistors R9 and R10, the resistor R12 connected to the emitter, and the resistor R11 connected to the collector, and the signal applied to the terminal 23D is the transistor Tr3. After appearing at the output terminal 23E after amplification by. Here, the terminal 23D is connected to the microphone circuit 21, and a microphone signal appears at the terminal 23E.
[0039]
Next, a case where a shocking force such as dropping is applied to the microphone will be described with reference to FIG.
[0040]
As described above, when an impact force such as a drop is applied to the microphone, a signal corresponding to the impact force is transmitted from the vibration sensor 24 to the amplification unit 23B via the cable 57. The signal transmitted to the amplifying unit 23B is transmitted to the transistor Tr1 through the capacitor C1, obtains a predetermined amplification, and is transmitted to the output cutoff unit 23C through the capacitor C2. When the signal transmitted at this time is much larger than the signal at the steady state, the transistor Tr2 reaches the operating point and is turned on. That is, at the same time as the collector part of Tr2 is turned on, a current flows, causing a voltage drop. That is, the charge charged in the capacitor C3 flows all at once, and the voltage drops. With this voltage drop, the base potential of the transistor Tr3 also drops, so that the transistor Tr3 becomes inoperable and the signal applied to the terminal 23D does not appear at the terminal 23E. Therefore, a signal with large noise picked up by the microphone main body 11 having the same cause as that detected by the vibration sensor 24 does not appear at the output end 23E due to the operation of the output blocking unit 23C. By this operation, abnormally large noise is blocked without being transmitted to the connected device.
[0041]
When the shocking force passes, the vibration sensor 24 returns to the steady state and outputs the steady state described above. This output signal enters the connected amplifying unit 23B, undergoes predetermined amplification, and is further applied to the output blocking unit 23C. However, as described above, the signal from the vibration sensor 24 in the steady state is small and the transistor Tr2 cannot be turned on, so that the transistor Tr2 returns to a non-operational state. However, the capacitor C3 discharges its charge while Tr2 is ON. Simultaneously with the turning off of the transistor Tr2, the capacitor C3 starts to be charged through the resistor R9 and gradually increases its potential. As the capacitor C3 is charged, the base potential of the transistor Tr3 gradually rises, and eventually the transistor Tr3 enters an operating state, and the microphone signal at the terminal 23D gradually recovers through the transistor Tr3 and appears at the terminal 23E. Return to size.
Thus, a steady operation is performed as if there was nothing.
[0042]
The above-described example shows a configuration in which the piezoelectric element 51 shown in FIG. When the vibration sensor 24 is configured more simply and at a low price, the spring method shown in FIG. 6 is also possible. In this case, the output cutoff circuit connected to the spring-type vibration sensor 24 has the circuit configuration shown in FIG.
[0043]
First, the configuration of the spring-type vibration sensor 60 will be described.
The spring-type vibration sensor 60 includes a spring material 61, an electrode material 62, a spacer 63, a cover 64, a signal line 65A, and a signal line 65B. The spring material 61 is fixed at one end and attached with a weight 61A at the other end, and has a configuration that can freely vibrate. The spring material 61 is made of a highly rigid and highly conductive material such as phosphor bronze. The electrode material 62 is disposed close to the spring material 61 and is made of a highly rigid and highly conductive material. The spacer 63 is made of a material that steadily supports the spring material 61 and the electrode material 62 at a predetermined distance and is electrically insulated. The cover 64 is provided for securing the movable space of the spring material 61 and protecting the mechanical components. The signal line 65 </ b> A is electrically connected to the spring material 61. The signal line 65B is electrically connected to the electrode material 62.
[0044]
Next, the operation of the spring-type vibration sensor 60 will be described.
When a shocking force such as dropping is applied to the vibration sensor 60 having the structure shown in FIG. 6, the spring material 61 swings in response to the shock. In particular, when the impact force is large, the tip 61B of the weight 61A at the free end of the spring material 61 contacts the electrode material 62. That is, by this contact, the signal line 65A and the signal line 65B are electrically connected. In other words, in a steady state, the signal line 65A and the signal line 65B are open, and when the impact force is applied, the signal line 65A and the signal line 65B function as a switch by an impact force that is brought into conduction.
[0045]
Next, the output blocking unit 71 of the output blocking device 22 using such a spring type vibration sensor 60 will be described. The output cutoff unit 71 of the output cutoff device 22 using the spring type vibration sensor 60 has a configuration in which the spring type vibration sensor 60 is inserted into the portion Tr2 in FIG.
When an impact force such as dropping is applied, an impact detection signal from the spring vibration sensor 60 is applied to the terminals 71A and 71B. Then, since the vibration sensor 60 becomes conductive due to the impact force, the terminal 71A is in the same state as when directly grounded to the ground terminal 71G. Accordingly, the electric charge charged in the capacitor C3 flows to the ground all at once, and the voltage at the terminal 71A drops. Along with this voltage drop, the base potential of the transistor Tr3 also drops, so that the transistor Tr3 becomes inoperable and the signal applied from the terminal 71C is not output to the terminal 71D. Therefore, a large signal picked up by the microphone main body 11 due to the same factor as detected by the vibration sensor 60 does not appear at the output end 71D due to the operation of the output blocking unit 71. Thus, similarly to the vibration sensor 24 using the piezoelectric element 51, the output blocking device 22 operates and can block abnormal noise from being transmitted to the connected device.
[0046]
Embodiment 2 of the Invention
Embodiment 2 of the invention relates to a mobile phone. Details will be described below.
[0047]
Recent mobile phones employ a highly sensitive microphone as well as being smaller and lighter. When the mobile phone is dropped or an object is collided with the mobile phone due to the downsizing and the high sensitivity of the microphone, a sound corresponding to the impact is transmitted to the communication partner, It gives an uncomfortable feeling. Therefore, in the second embodiment of the present invention, this problem is solved by providing, for example, the output cutoff device 22 including the vibration sensor 24 and the output cutoff circuit 23 shown in FIG. 3 on the signal board of the mobile phone. It has been solved.
[0048]
On the other hand, in the case of a mobile phone, the connection state between the exterior case and the substrate that is building the communication function is not necessarily high in rigidity, so the above-mentioned “squeaking noise” or the “sliding noise” of the phone while walking In some cases, it is difficult to obtain a sufficient effect.
[0049]
Therefore, an embodiment of a mobile phone to which the present invention is applied for improving “squeaking noise” and “sliding sound” will be described with reference to a plan view and a cross-sectional view shown in FIG.
[0050]
As shown in FIG. 8, the mobile phone 101 has a front case 111, on which a liquid crystal display panel 112, operation buttons 113, a receiver opening 114, and the like are arranged. The mobile phone 101 includes a circuit board 121. The circuit board 121 includes components such as a receiver 122 for receiving a voice, a microphone main body 123 for transmitting a voice, and a microphone circuit thereof. It contains the components that make up all functions. Further, the mobile phone 101 includes a back case 131, a battery 132, and a battery case 133 for storing and fixing the battery 132 in the back case 131. Furthermore, the cellular phone 101 is provided with an output cutoff device that includes a vibration sensor 142 and an output cutoff circuit.
[0051]
Here, the vibration sensor 142 is fixed to the front case 111 as shown in the cross-sectional view of FIG. In particular, the vibration sensor 142 is fixed inside the front case 111, that is, on the circuit board 121 side and in the vicinity of the microphone opening 123. By being fixed in such a position, the vibration sensor 142 can easily detect the impact force received by the front case 111.
[0052]
Next, the operation of the mobile phone 101 according to the embodiment of the present invention will be described. If a user strongly squeezes the cellular phone 101 during a call using the cellular phone 101, the small and lightweight cellular phone 101 is distorted, and between the front case 111 and the back case 131 or between the front case 111 and the circuit. Deviation occurs between the substrates 121, and a creaking sound is generated due to the deviation.
[0053]
A part of the creaking sound generated in the mobile phone 101 diverges in the air as a rubbing sound, and a part thereof propagates in the front case 111 and propagates to nearby components. The microphone main body 123 disposed in the vicinity of the microphone opening 123A of the front case 111 directly transmits sound emitted from the front case 111 into the air, and particularly when the front case 111 and the microphone main body 123 are in contact with each other. Received and detected as sound. At the same time, since the cellular phone 101 has the vibration sensor 142 fixed in the vicinity of the microphone opening 123A inside the front case 111, the vibration sensor 142 effectively detects the vibration caused by the squeak noise and is connected. To the output cutoff circuit. Similar to the output cutoff circuit 23 described above, the output cutoff circuit operates so as not to send the output of the microphone main body 123 to a signal circuit (not shown) connected when a signal having a predetermined magnitude or larger is input.
[0054]
With this operation, the mobile phone 101 according to the second embodiment of the present invention can block the transmission of “squeaking noise” to the communication partner.
[0055]
In the above, the “squeaking noise” that strongly grasps the mobile phone has been described, but in the case of sliding sound, the output blocking device of the present invention operates in the same way to prevent the sliding sound from being transmitted to the communication partner. it can.
[0056]
Further, as the vibration sensor used in the mobile phone according to the second embodiment of the present invention, either the configuration using the piezoelectric element shown in FIG. 3 or the spring type configuration shown in FIG. 6 can be used. It can be used properly in consideration of the shape of the telephone 101, expected accuracy, reliability, and the like.
[0057]
Embodiment 3 of the Invention
Embodiment 3 of the present invention relates to a desk phone that is used stationary on a desk in a general home or office. Hereinafter, this will be described in detail with reference to FIG.
[0058]
A desk phone according to the third embodiment of the present invention has the output cutoff device described in detail in the first embodiment of the present invention. FIG. 9 shows a partial cross-sectional view of a handset provided in the desk phone. A handset 151 in this desk phone includes a receiver unit 152, a microphone body 153, a vibration sensor 155, and an output shut-off device. The receiver unit 152 is provided at one end of the handset 151 and converts the received signal into sound. The microphone main body 153 is provided on the end opposite to the receiver unit 152. The vibration sensor 155 is disposed in the vicinity of the microphone body 153. The output cutoff device has a vibration sensor 155 and an output cutoff circuit (not shown).
[0059]
The operation of the output shut-off device will be described.
When a user drops the handset with an output shutoff device of the present invention during a call due to some event or hits an object, the impact is released into the air as an impact sound from the place where the handset 151 is generated. . Alternatively, a shock wave is propagated through a member such as a case of the handset 151 and directly transmitted to the microphone main body 153. Alternatively, the impact sound propagates through the air and is transmitted as a sound from the microphone opening 153A to the microphone body 153. Due to such an event, the microphone main body 153 detects noise due to the impact. This impact is detected by a vibration sensor 155 installed in the vicinity of the microphone main body 153 and transmitted to an output cutoff circuit to be connected. Since the operations of the microphone main body 153 and the output cutoff device are the same as the relationship between the microphone main body and the output cutoff device of each device described above, the following description is omitted.
[0060]
By using the handset with an output shut-off device shown in the third embodiment of the present invention, even if the handset is dropped, the impact sound is cut off by the operation of the output shut-off device. There is an effect that can be eliminated.
[0061]
Other Embodiments of the Invention
The vibration sensor shown in FIG. 3 includes one piezoelectric element. However, the present invention is not limited to this, and a plurality of piezoelectric elements may be provided as shown in FIG. As shown in FIG. 10, this vibration sensor is provided with a piezoelectric element 510 and a piezoelectric element 511. A conductive support member 520 is provided between the piezoelectric element 510 and the piezoelectric element 511. In addition, the piezoelectric element 511 is fixed to the element substrate 55 via the support member 521.
[0062]
By providing a plurality of piezoelectric elements in this way, the output of the vibration sensor can be increased. In FIG. 10, two piezoelectric elements are provided. However, the present invention is not limited to this, and three or more piezoelectric elements may be provided.
[0063]
【The invention's effect】
According to the present invention, it is possible to provide a microphone, a mobile phone, and a desk phone that can block the generation of an impact sound even when an impact is applied.
[Brief description of the drawings]
FIG. 1 is a block diagram of a microphone according to the present invention.
FIG. 2 is a cross-sectional view showing the structure of the microphone of the present invention.
FIG. 3 is a cross-sectional view showing the structure of the vibration sensor of the present invention.
FIG. 4 is a circuit diagram showing a configuration of an output cutoff circuit of the present invention.
FIG. 5 is a circuit diagram showing a configuration of an output cutoff circuit of the present invention.
6 is a cross-sectional view showing a structure of a spring-type vibration sensor of the present invention. FIG.
FIG. 7 is a circuit diagram showing a configuration of an output cutoff circuit of the present invention.
FIG. 8 is a cross-sectional view showing a mobile phone with an output cutoff device.
FIG. 9 is a cross-sectional view showing the handset of the present invention.
FIG. 10 is a cross-sectional view showing the structure of the vibration sensor of the present invention.
FIG. 11 is a cross-sectional view of a conventional microphone.
[Explanation of symbols]
10: Microphone with output cutoff device of the present invention
11: Microphone body
11A, 11B: Output terminal
21: Microphone circuit section
22: Output shut-off device
23: Output cutoff circuit
23A: Sensor unit
23B: Amplification part
23C: Output shut-off section
23D: Terminal (input terminal)
23E: Terminal (output terminal)
23F: Terminal (power supply)
23G: Terminal (ground)
23H: Terminal (output terminal)
24: Vibration sensor
26: Circuit board
31: Cable
31A, 31B: Signal terminals
41: Front case
42: Case stop
43: Case body
44: Bush
51: Piezoelectric element
51A, 51B: Electrode surface
51C: Free end
52: Support member
53: Wire rod
54: Electrolytic effect transistor
55: Element substrate
56A, 56B: Shield case
57: Cable
61: Spring material
61A: Weight
62: Electrode material
63: Spacer
64: Cover
65A: signal line (signal),
65B: signal line (ground)
71: Output shut-off section
71A: Terminal (signal)
71B: Terminal (ground)
71C: Input terminal
71D: Output terminal
71E: Terminal (power supply)
71G: Terminal (ground)
101: Mobile phone
111: Front case
112: Liquid crystal panel
113: Operation button
114: Receiver opening
121: Circuit board
122: Receiver
123: Microphone body
123A: Microphone opening
131: Back case
132: battery
133: Battery case
142: Vibration sensor
151: Handset
152: Receiver section
153: Microphone body
153A: Microphone opening
155: Vibration sensor
155A: Vibration sensor cable

Claims (6)

A microphone that inputs audio information and converts it into an electrical signal,
Converting means for converting into an electric signal audio information is input,
A case for accommodating the conversion means;
A vibration sensor disposed in the case apart from the conversion means and fixed to the case via a vibration transmission member ;
An output blocking means for inputting a signal output from the conversion means and blocking the output of the input signal based on the vibration detected by the vibration sensor ;
The microphone includes a bush formed of a metal material and disposed in contact with the case, and a circuit board on which the output blocking means is mounted . A microphone that inputs audio information and converts it into an electrical signal,
Conversion means for converting the input audio information into an electrical signal and outputting the electrical signal;
A case for accommodating the conversion means;
A vibration sensor disposed in the case apart from the conversion means and fixed to the case directly or via a vibration transmission member;
An output blocking means for inputting a signal output from the conversion means and blocking the output of the input signal based on the vibration detected by the vibration sensor;
The vibration sensor has one end fixed and a weight at the other end, and includes a conductive elastic member and an electrode material provided to face the elastic member. In a steady state, the vibration sensor and the elastic member The microphone is characterized in that, in a state where the electrode material is separated and an impact is applied, vibration is detected by electrically connecting the elastic member and the electrode material . A mobile phone comprising the microphone according to claim 1 . A desk phone comprising the microphone according to claim 1 . A case covering the outer periphery,
A microphone that is arranged in the case and converts the input voice information into an electrical signal and outputs the electrical signal;
A vibration sensor disposed in the case apart from the microphone and fixed to the case via a vibration transmission member ;
An output blocking means for inputting a signal output from the microphone and blocking the output of the input signal based on the vibration detected by the vibration sensor ;
The vibration transmitting member includes a bush formed of a metal material and disposed in contact with the case, and a circuit board on which the output blocking means is mounted . A desk phone having a handset,
The handset
A housing,
A microphone that is arranged in the housing and converts the input audio information into an electrical signal and outputs the electrical signal;
A vibration sensor disposed in the housing apart from the microphone and fixed to the housing via a vibration transmitting member ;
An output blocking means for inputting a signal output from the microphone and blocking the output of the input signal based on the vibration detected by the vibration sensor ;
The desk phone , wherein the vibration transmission member includes a bush formed of a metal material and disposed in contact with the housing, and a circuit board on which the output blocking means is mounted .

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