JP3071017U - Ceramic piezoelectric microphone - Google Patents

Abstract

(57) [Problem] To provide a ceramic piezoelectric microphone. SOLUTION: The ceramic piezoelectric microphone of the present invention has a lower lid and an upper lid, and a single accommodating space is generated inside after the both are combined, and the signal line drawn from the extending portion of the lower lid into the accommodating space. After being passed through one board, a ceramic piezoelectric piece is connected to another circuit board and connected to another side of the circuit board, a high-density foam is provided between the ceramic piezoelectric piece and a fixed portion on the inner surface of the upper lid, and the upper lid is provided. When the ratio between the diameter of the surface and the contact thickness formed by the upper lid is larger than 0.15, the sound wave generated by the contact between the lid surface and the skin of the throat reaches the ceramic piezoelectric piece from the foam and is directly converted into a signal and output. In addition, most background noise other than the user's voice is attenuated and eliminated.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a type of ceramic piezoelectric microphone, and more particularly, to a structure of a throat microphone that can accurately propagate.

[0002]

[Prior art]

 As shown in FIG. 4, a well-known skin contact piezoelectric microphone includes a front lid 61 and a rear lid 62. The front edge of the front lid 61 is relatively thin, and a convex point 63 is provided inside. After the combination of the front lid 61 and the rear lid 62, one closed space 64 is generated therein, and a locking end 65 is formed at the edge of the rear lid 62, and the metal conductive piece 66 is placed therebetween. A PC plate 67 is provided above the metal conductive piece 66, and the PC plate 67 is used as a welding point of an electrode or used for adding an amplifier element circuit. A piezoelectric metal piece 68 and a lower ceramic piezoelectric piece 69 are in contact with each other, and a signal metal conductive piece 71 and a spring 72 (shown as a leaf spring in the figure) are provided below the upper ceramic piezoelectric piece 68 in tight contact with each other. The large end is located in the convex point 63 on the front edge of the front lid 21 The relatively small end slightly presses the signal metal conductive piece 71, the metal conductive piece 66 is provided with the negative signal electrode contact 73, and is connected to the negative electrode of the PC board 67 at the signal electrode welding point 75. A positive electrode signal electrode welding point 74 is provided on the conductive piece 71 and connected to a positive electrode signal electrode contact 76 of the PC board 67. The positive and negative signal electrode welding points of the PC board 67 are further connected to the signal feed wire 77 by welding. As a result, the front edge of the front lid 61 generates sound signals with the ceramic elements of the signal metal conductive piece 71, the lower ceramic piezoelectric piece 69, and the upper ceramic piezoelectric piece 68, and the PC board 67 further conducts to the signal feed line 77. To generate a relatively large output sound signal, isolate background sound, and effectively generate feedback sound. It is set to its features to prevent. The ceramic piezoelectric element and its metal conductive piece are provided in two pieces or one piece or two or more pieces. The decrease or increase in the number of elements is modified by the output unit voltage and sound quality, but does not affect the basic characteristics. .

[0003] However, the known structure described above has some disadvantages. That is, in actual use, it is possible to generate metallic noise, and it is not possible to achieve the same level of sound integrity and signal fidelity as a general microphone, and therefore further. Improvement was sought.

[0004]

[Problems to be solved by the invention]

 An object of the present invention is to provide a kind of ceramic piezoelectric microphone. The sound collection and conduction method uses a high-density foam material. The characteristic that improves the sound distortion created by imperfections in the high-frequency resonance response of the sound collector and thereby makes the output signal of the piezoelectric microphone closer to the original sound is the size of the airtight chamber between the high-density foams. Irrespective of the corresponding audio response frequency, by controlling the volume of the airtight chamber contained in the foam and further combining the calculation of the audio transmission distance, a faithful propagation of the audio broadcast can be achieved. Can be effectively controlled. For example, warship telecommunications tubes use air-conducting sound and can combine a cavity and tube diameter design to transmit one small sound over tens or hundreds of kilometers. In addition, the design of the anechoic chamber required for acoustic testing is based on the same principle, except that the purpose of the anechoic chamber is to absorb all sound reflections, while the present invention is based on the idea that each part of the sound It collects, resets, and enhances high and low pitches, and aims to complete partial sound quality.

[0005]

[Means for Solving the Problems]

 The invention according to claim 1 has a lower lid and an upper lid, and when the two are combined, one housing space is generated inside, and the signal line drawn from the extension of the lower lid is passed through the one board into the housing space. After that, a ceramic piezoelectric piece is connected to one circuit board and another side of the circuit board is connected, and a high-density foam is provided between the ceramic piezoelectric piece and a fixed portion on the inner surface of the upper lid, and the lid surface and the throat skin The sound wave generated by the contact is transmitted from the foam to the ceramic piezoelectric piece and directly converted into a signal, which is output, and attenuated and eliminated most background noise other than the user's voice. According to a second aspect of the present invention, there is provided the ceramic piezoelectric microphone according to the first aspect, wherein a ratio between a diameter of a surface of the upper lid and a contact thickness formed by the upper lid is larger than 0.15. The invention according to claim 3 is characterized in that a metal or non-metallic substance is mixed and added to the high-density foam sandwiched between the ceramic piezoelectric piece and the upper lid to compose a sound wave transmission medium. The described ceramic piezoelectric microphone is used.

[0006]

[Embodiment of the invention]

 The ceramic piezoelectric microphone of the present invention has a lower lid and an upper lid, and after the two are combined, a single accommodation space is created inside, and the signal line drawn from the extension of the lower lid into the accommodation space is on one substrate. After passing through, a ceramic piezoelectric piece is connected to one circuit board and to the other side of the circuit board, a high-density foam is provided between the ceramic piezoelectric piece and the fixed part on the inner surface of the upper lid, and the surface of the upper lid is When the ratio between the diameter and the contact thickness formed by the upper lid is larger than 0.15, the sound waves generated by the contact between the lid surface and the skin of the throat reach the ceramic piezoelectric piece from the foam and are directly converted to signals and output. In addition, most background noise other than the user's voice is attenuated and eliminated.

[0007]

【Example】

 1 to 3 show the ceramic piezoelectric microphone of the present invention, which has a lower lid 1 and an upper lid 2, which are combined with each other to form one accommodating space 3 therein. In the above, after the signal line 4 is drawn into one extending portion 11 of the lower cover 1 and penetrates one substrate 5, it is connected to one substrate 6, and between the upper lid 2 and the lower lid 1 beside the signal line 4. One end of one ring frame 9 is connected to one side, one ceramic piezoelectric piece 7 is connected to another side of the substrate 6, and one high-density foam is formed between the ceramic piezoelectric piece 7 and the fixed portion 21 on the inner surface of the upper lid 2. When the ratio between the diameter 20 of the surface of the upper lid 2 and the contact thickness 22 formed by the upper lid 2 is larger than 0.15, sound waves generated by the skin contact between the surface of the upper lid 2 and the throat 10 are foamed. It is transmitted to the ceramic piezoelectric piece 7 through the body and directly Output is converted into a signal, all of the background noise of the majority of non-voice user attenuated eliminated.

The present invention achieves a soft propagation system by the high-density foam 8, operates air vibration in the foam, generates good sound wave transmission, reduces loss of sound wave intensity, and And the sound quality can be more completely preserved. In addition, as shown in FIG. 3, by combining the ring frame 4 and the earphone 3 with the microphone 30 of the present invention, the present invention can be implemented in a mobile phone or other electronic equipment. Further, as shown in FIG. 2, the electric circuit of the present invention converts the sound wave 50 into an electronic signal by the ceramic piezoelectric piece 7 which is sensitive and transmits the electric signal through the resistance matching and waveform processing circuit 51, and then the sound wave amplification circuit 52 outputs the sound signal. Generates power input and audio frequency output effects. The biggest feature of the sound after it is processed by the conductive and sensitive conversion device is that it attenuates other background noise outside the user's voice and generates feedback, in addition to the functions that the microphone originally has. There are many things. One ratio value is provided in the above description, but its purpose is to prevent crushing noise caused by imperfect contact surface when used by thin type users, or to be used by relatively fat people The purpose is to prevent incomplete voice response due to the cover sometimes being covered. Therefore, the best use condition can be obtained by making appropriate settings. This ratio is the result of the ratio between the sound collection area and the sound propagation distance obtained after calculation. The high-density foam sandwiched between the ceramic piezoelectric piece and the upper lid forms a sound transmission medium by mixing and adding other metallic or non-metallic substances. In this way, the sound quality or characteristics of the output unit can be modified, but the basic characteristics are not affected.

The above is a description of preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, but to modify or modify details that can be made based on the present invention, and to achieve the same effects as the present invention. Any achievable design matter falls within the scope of the present invention.

[0010]

[Effect of the invention]

 The ceramic piezoelectric microphone of the present invention has a lower lid and an upper lid, and after the two are combined, a single accommodation space is created inside, and the signal line drawn from the extension of the lower lid into the accommodation space is on one substrate. After passing, the ceramic piezoelectric piece is connected to one circuit board and the other side of the circuit board, and a high-density foam is provided between the ceramic piezoelectric piece and the fixed part on the inner surface of the upper lid, and the surface of the upper lid is When the ratio between the diameter and the contact thickness formed by the upper lid is larger than 0.15, the sound waves generated by the contact between the lid surface and the skin of the throat reach the ceramic piezoelectric piece from the foam and are directly converted to signals and output. The feature of the present invention is that it attenuates and eliminates most background noises other than the user's voice. The present invention has practicality, novelty, and industrial value.

[Brief description of the drawings]

FIG. 1 is a sectional view of the present invention.

FIG. 2 is an electric circuit diagram of the present invention.

FIG. 3 is a perspective view of the embodiment of the present invention.

FIG. 4 is a sectional view of a known technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Lower lid 11 Extension part 2 Upper lid 20 Diameter 21 Fixed part 22 Contact thickness 3 Housing space 4 Signal line 5 Substrate 6 Circuit board 7 Ceramic piezoelectric piece 8 High-density foam 9 Ring frame 10 Throat part 30 Microphone 31 Earphone 50 Sound wave 51 Waveform processing circuit 52 Audio frequency amplifying circuit 61 Front cover 62 Back cover 63 Convex point 64 Enclosed space 65 Locking end 66 Metal conductive piece 67 PC board 68 Upper ceramic piezoelectric piece 69 Lower ceramic piezoelectric piece 71 Signal metal conductive piece 72 Spring 73 Minus Pole welding point 74 Positive pole welding point 75 Negative pole contact 76 Positive pole contact 77 Feed wire

Claims (3)

[Utility model registration claims] 1. After the lower lid and the upper lid are provided, one housing space is generated inside after the two are combined, and the signal line drawn from the extending portion of the lower lid is passed through the one board into the housing space. The ceramic piezoelectric piece is connected to one circuit board and the other side of the circuit board is connected to the ceramic piezoelectric piece, and a high-density foam is provided between the ceramic piezoelectric piece and the fixed portion on the inner surface of the upper lid, and the contact between the lid surface and the throat skin A piezoelectric ceramic microphone is characterized in that sound waves generated by the device are directly converted into a signal from a foam to a ceramic piezoelectric piece and output, so that most background noise other than a user's voice is attenuated and eliminated. 2. The ceramic piezoelectric microphone according to claim 1, wherein a ratio of a diameter of a surface of the upper lid to a contact thickness formed by the upper lid is larger than 0.15. 3. The sound transmission medium according to claim 1, wherein a metal or a non-metal material is mixed and added to the high-density foam sandwiched between the ceramic piezoelectric piece and the upper lid. Ceramic piezoelectric microphone.