CN-122002199-A - Special electret sensor for heart lung sound and assembling method thereof

Abstract

The invention relates to a heart-lung sound special electret sensor and an assembly method thereof. The special heart-lung sound electret sensor comprises a shell, an upper cover, an electret capacitor and a PCB assembly, wherein the electret capacitor is electrically connected with the PCB assembly, the electret capacitor comprises a vibrating diaphragm, a back electrode plate and an insulating ring, a first counterweight adjusting piece is arranged on one side, away from the insulating ring, of the vibrating diaphragm, a second counterweight adjusting piece is arranged on one side, away from the vibrating diaphragm, of the first counterweight adjusting piece, a first frequency adjusting hole is formed in the first counterweight adjusting piece, a second frequency adjusting hole is formed in the second counterweight adjusting piece, the electret capacitor is used for generating changed heart-lung sound electric signals through vibration of the vibrating diaphragm, the PCB assembly is used for amplifying the heart-lung sound electric signals, and the amplified heart-lung sound electric signals are provided for an external circuit to be used for disease diagnosis. The special heart lung sound electret sensor can adjust the resonant frequency and the output sensitivity according to the requirements of application scenes, and has remarkable technical advantages in the heart lung sound detection field.

Inventors

• LU HAOHUA
• LIN YUTING

Assignees

• 深圳市奥多格科技有限公司

Dates

Publication Date

20260508

Application Date

20241104

Claims (10)

1. 1. The special heart-lung sound electret sensor is characterized by comprising a shell, an upper cover arranged on one side of the shell, an electret capacitor arranged on the other side of the shell and a PCB assembly arranged between the upper cover and the electret capacitor, wherein the electret capacitor is electrically connected with the PCB assembly; the electret capacitor comprises a vibrating diaphragm, a back polar plate and an insulating ring arranged between the vibrating diaphragm and the back polar plate; a first weight adjusting piece is fixedly arranged on one side, away from the insulating ring, of the vibrating diaphragm, a second weight adjusting piece is fixedly arranged on one side, away from the vibrating diaphragm, of the first weight adjusting piece, and the first weight adjusting piece and the second weight adjusting piece are made of different materials; The first weight adjusting piece is provided with a plurality of first frequency adjusting holes, and the second weight adjusting piece is provided with a plurality of second frequency adjusting holes; the electret capacitor is used for generating a changed cardiopulmonary acoustic signal through vibration of the vibrating diaphragm, the PCB assembly is used for amplifying the cardiopulmonary acoustic signal and providing the amplified cardiopulmonary acoustic signal to an external circuit for disease diagnosis.
2. 2. The heart lung sound specialty electret sensor of claim 1, wherein the first frequency adjustment hole is aligned with the second frequency adjustment hole and the area of the first frequency adjustment hole is smaller than the area of the second frequency adjustment hole.
3. 3. The special heart-lung sound electret sensor according to claim 1 or 2, wherein the diaphragm is circular, and the edge of the diaphragm is fixedly connected with a diaphragm positioning ring.
4. 4. The heart lung sound special electret sensor according to claim 3, wherein an annular supporting wall is formed at one side edge of the housing in the axial direction of the housing; the annular supporting wall is provided with a first copper ring, and the vibrating diaphragm positioning ring is abutted to the first copper ring.
5. 5. The special heart lung sound electret sensor of claim 4, wherein a second copper ring is arranged between the upper cover and the PCB assembly, and the second copper ring is used for supporting the upper cover.
6. 6. The special heart lung sound electret sensor of claim 5, wherein the back plate is fixedly connected with the PCB assembly, and a third frequency adjusting hole is formed in the back plate.
7. 7. The special heart lung sound electret sensor according to claim 6, wherein the upper cover is provided with a wiring through hole and a tuning hole, and the PCB assembly is used for connecting the external circuit through the wiring through hole; The external circuit is also used for supplying power to the PCB assembly through the wiring through hole, and the tuning hole is used for attaching tuning fiber cloth.
8. 8. The special heart lung sound electret sensor of claim 7, wherein the PCB assembly is provided with a field effect tube; the grid electrode of the field effect tube is connected with the back electrode plate, the drain electrode of the field effect tube is connected with the first wiring terminal of the external circuit, the source electrode of the field effect tube is connected with the second wiring terminal of the external circuit, and the vibrating diaphragm is connected with the third wiring terminal of the external circuit.
9. 9. The special heart lung sound electret sensor of claim 8, wherein the field effect tube is a junction field effect tube.
10. 10. A method of assembling a heart lung sound specialty electret sensor as claimed in any one of claims 1 to 9 comprising: Determining an application scene of the heart-lung sound special electret sensor; Determining the resonant frequency of the heart-lung sound special electret sensor according to the application scene; plugging at least one second frequency adjusting hole in the second counterweight adjusting plate according to the resonant frequency; And assembling the second counterweight adjusting piece, the first counterweight adjusting piece, the vibrating diaphragm, the insulating ring, the back plate, the shell, the upper cover and the PCB assembly after the plugging operation into the heart lung sound special electret sensor.

Description

Special electret sensor for heart lung sound and assembling method thereof Technical Field The invention relates to the technical field of sensors, in particular to a heart-lung sound special electret sensor and an assembly method thereof. Background With the continuous development of technology, vibration sensors play a vital role in many application fields, such as voice transmission, medical health monitoring, industrial equipment monitoring, etc. In particular, in the fields of voice transmission, heart-lung sound detection and the like, higher requirements are put on the capturing precision and quality of signals. The problem of balancing the design of conventional vibration sensors between sensitivity and noise has always plagued industry professionals. The increased sensitivity of vibration sensors is often accompanied by increased background noise, which results in a reduced signal-to-noise ratio, such that the sensor is not capable of providing a high quality signal output in practical applications. Conversely, when noise is reduced to improve the signal-to-noise ratio, the sensitivity is often insufficient, and the required weak signal cannot be effectively captured. In speech transmission applications, the sensor needs to accurately capture various subtle sound variations, especially in human voice interactions, the sensitivity of the vibration sensor directly affects the accuracy of the speech recognition system. In the medical field, heart lung sound detection has extremely high requirements on weak and complex physiological signals, and the sensitivity and the signal to noise ratio of the sensor directly influence the accuracy of disease diagnosis. Therefore, the inability to achieve a balance between high sensitivity and low noise is a technical challenge in current vibration sensors. Disclosure of Invention Based on this, it is necessary to provide a heart-lung sound special electret sensor and an assembling method thereof, aiming at the problem that the balance of high sensitivity and low noise cannot be realized and the technical problem to be solved urgently of the current vibration sensor. A heart-lung sound special electret sensor comprises a shell, an upper cover arranged on one side of the shell, an electret capacitor arranged on the other side of the shell and a PCB assembly arranged between the upper cover and the electret capacitor, wherein the electret capacitor is electrically connected with the PCB assembly; the electret capacitor comprises a vibrating diaphragm, a back polar plate and an insulating ring arranged between the vibrating diaphragm and the back polar plate; a first weight adjusting piece is fixedly arranged on one side, away from the insulating ring, of the vibrating diaphragm, a second weight adjusting piece is fixedly arranged on one side, away from the vibrating diaphragm, of the first weight adjusting piece, and the first weight adjusting piece and the second weight adjusting piece are made of different materials; The first weight adjusting piece is provided with a plurality of first frequency adjusting holes, and the second weight adjusting piece is provided with a plurality of second frequency adjusting holes; the electret capacitor is used for generating a changed cardiopulmonary acoustic signal through vibration of the vibrating diaphragm, the PCB assembly is used for amplifying the cardiopulmonary acoustic signal and providing the amplified cardiopulmonary acoustic signal to an external circuit for disease diagnosis. When the special heart-lung sound electret sensor works, the vibrating diaphragm can vibrate under the action of the heart-lung sound mechanical vibration signal, so that the electret capacitor generates a changed heart-lung sound electric signal, the back plate can transmit the changed heart-lung sound electric signal to the PCB assembly, the PCB assembly can amplify the heart-lung sound electric signal, and an external circuit can diagnose diseases according to the amplified heart-lung sound electric signal. In the related art, vibration of the vibrating diaphragm is extremely easy to be interfered by high-frequency noise, the vibrating diaphragm can be subjected to weight adjustment through the first weight adjusting piece and the second weight adjusting piece to block the influence of the high-frequency interference on the vibrating diaphragm, further, the first frequency adjusting piece and the second frequency adjusting piece can be used for enabling sound signals to pass through so as to enable the vibrating diaphragm to vibrate, further, if only a single weight adjusting piece is arranged on the vibrating diaphragm, when the weight meets the requirement, the hole depth of the frequency adjusting piece possibly does not meet the requirement, when the hole depth of the frequency adjusting piece meets the requirement, the weight possibly does not meet the requirement, the first weight adjusting piece and the second weight adjusting piece a