阅读说明：本技术 一种汽车仪表用讯响器及其制作方法 (Signal sounder for automobile instrument and manufacturing method thereof ) 是由 王平 张峰磊 鲍晨凯 李红元 吴逸飞 于 2021-06-17 设计创作，主要内容包括：本发明涉及发声器件技术领域,尤其涉及一种汽车仪表用讯响器及其制作方法,包括：盆架,盆架沿其厚度方向具有台阶腔；磁罩,与盆架一体注塑成型；磁铁,固定在磁罩底部,用于提供磁场；印刷线圈,包括呈管状的固定基材和低温打印在固定基材上的线路；主线圈,绕制在印刷线圈上；音膜,与主线圈的一端固定连接,并且边缘固定在盆架边缘；焊片,固定在盆架的底面,用于主线圈和印刷线圈的连接；其中,印刷线圈的内径大于磁铁的外径,印刷线圈和主线圈通电时,主线圈及印刷线圈带动音膜的振动。本发明通过在主线圈内部增加一低温打印制成的印刷线圈,从而在有限的空间内进一步提升了线圈的匝数,以此来提高讯响器在同等体积下的声压。(The invention relates to the technical field of sounding devices, in particular to a buzzer for an automobile instrument and a manufacturing method thereof, wherein the sounding device comprises: the basin stand is provided with a step cavity along the thickness direction; the magnetic cover and the basin frame are integrally formed by injection molding; the magnet is fixed at the bottom of the magnetic cover and used for providing a magnetic field; the printed coil comprises a tubular fixed base material and a circuit printed on the fixed base material at a low temperature; the main coil is wound on the printed coil; the sound film is fixedly connected with one end of the main coil, and the edge of the sound film is fixed at the edge of the basin stand; the soldering lug is fixed on the bottom surface of the basin frame and used for connecting the main coil with the printing coil; the inner diameter of the printing coil is larger than the outer diameter of the magnet, and when the printing coil and the main coil are electrified, the main coil and the printing coil drive the sound film to vibrate. According to the invention, the printed coil made by low-temperature printing is added in the main coil, so that the number of turns of the coil is further increased in a limited space, and the sound pressure of the buzzer under the same volume is increased.)

1. A signal sounder for automobile instruments is characterized by comprising:

the pot frame is provided with a step cavity along the thickness direction;

the magnetic cover and the basin frame are integrally formed in an injection molding mode;

the magnet is fixed at the bottom of the magnetic cover and used for providing a magnetic field;

the printed coil comprises a tubular fixed base material and a circuit printed on the fixed base material at a low temperature;

the main coil is wound on the printed coil;

the sound film is fixedly connected with one end of the main coil, and the edge of the sound film is fixed at the edge of the basin stand;

the soldering lug is fixed on the bottom surface of the basin frame and used for connecting the main coil with the printing coil;

the inner diameter of the printing coil is larger than the outer diameter of the magnet, and when the printing coil and the main coil are electrified, the main coil and the printing coil reciprocate in the thickness direction of the magnet to drive the sound film to vibrate.

2. The beeper for automobile instrument as claimed in claim 1, wherein the fixing substrate is made of PI film.

3. The annunciator of claim 2, wherein the circuit printed on the fixed substrate is fixed on a light heat-resistant substrate.

4. The annunciator of claim 3, wherein the lightweight heat-resistant substrate is kraft paper.

5. The sounder for automobile instruments according to claim 1, wherein the lines are printed on an inner wall and/or an outer wall of the fixing substrate.

6. The sounder for automobile instruments according to claim 3, wherein the wiring is printed on an inner wall or an outer wall of the fixed base material in a unidirectional spiral winding manner.

7. The buzzer for automobile instruments as claimed in claim 1, wherein the step cavity is further provided with a vent hole on the bottom surface.

8. The buzzer for automobile instruments according to claim 7, characterized in that a damping mesh cloth covering the vent hole is further fixed on the bottom surface of the step cavity.

9. The sounder for automotive instruments according to claim 1, wherein the top surface of the magnet further comprises pole pieces for magnetically guiding the positive pole of the magnet into the magnetic gap.

10. A method for manufacturing a buzzer for a vehicle instrument as claimed in any one of claims 1 to 9, comprising the steps of:

integrally injection molding the basin stand and the magnetic cover;

fixing the magnet in the middle of the bottom of the magnetic shield;

fixing the pole piece on the upper surface of the magnet;

pasting damping mesh on the bottom surface of the basin stand;

fixing the soldering lug on the basin frame;

printing a printed coil and fixing the printed coil on a light heat-resistant base material;

winding the main coil on the printed coil, and fixing one end of the main coil on the sound film;

connecting the main coil and the printed coil on the soldering lug connection point;

the sound film is fixed on the basin frame.

Technical Field

The invention relates to the technical field of sound production devices, in particular to a buzzer for an automobile instrument and a manufacturing method thereof.

Background

The buzzer is used for alarming of the instrument, the working principle of the buzzer is similar to that of a moving-coil loudspeaker, and the buzzer comprises a magnet, a coil and a vibrating diaphragm, wherein a variable current passes through the coil to generate a variable magnetic field, and the vibrating diaphragm vibrates under the action of the variable current and the magnetic field of the magnet so as to make a sound; because the automobile instruments tend to be miniaturized more and more, how to improve the sound effect of the sounder becomes a problem to be solved urgently at present;

in the related art, the sound effect of the buzzer is improved by adopting materials for improving the vibrating diaphragm, but the materials with good sound effect are expensive, and are not beneficial to batch production and popularization; or, the power is increased by increasing the number of turns of the coil, but the volume of the coil is increased by increasing the number of turns of the coil or increasing the diameter of the coil, which is contrary to the trend of miniaturization.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: provides a buzzer for automobile instruments and a manufacturing method thereof, which improves the sound effect of the buzzer.

In order to achieve the purpose, the invention adopts the technical scheme that:

in one aspect, a buzzer for a vehicle instrument is provided, comprising:

the pot frame is provided with a step cavity along the thickness direction;

the magnetic cover and the basin frame are integrally formed in an injection molding mode;

the magnet is fixed at the bottom of the magnetic cover and used for providing a magnetic field;

the printed coil comprises a tubular fixed base material and a circuit printed on the fixed base material at a low temperature;

the main coil is wound on the printed coil;

the sound film is fixedly connected with one end of the main coil, and the edge of the sound film is fixed at the edge of the basin stand;

the soldering lug is fixed on the bottom surface of the basin frame and used for connecting the main coil with the printing coil;

the inner diameter of the printing coil is larger than the outer diameter of the magnet, and when the printing coil and the main coil are electrified, the main coil and the printing coil reciprocate in the thickness direction of the magnet to drive the sound film to vibrate.

Furthermore, the fixed substrate is made of a PI film.

Further, the wiring printed on the fixed base material is fixed on the light heat-resistant base material.

Further, the light heat-resistant substrate is kraft paper.

Further, the lines are printed on the inner and/or outer wall of the fixed substrate.

Further, the wiring is spirally wound printed in a single direction on the inner wall or the outer wall of the fixed substrate.

Further, the bottom surface of the step cavity is also provided with a vent hole.

Furthermore, a damping mesh cloth covering the vent holes is fixed on the bottom surface of the step cavity.

Further, the top surface of the magnet is also provided with a pole piece which is used for magnetically guiding the positive pole of the magnet into the magnetic gap.

The invention also provides a manufacturing method of the buzzer for the automobile instrument, which comprises the following steps of:

integrally injection molding the basin stand and the magnetic cover;

fixing the magnet in the middle of the bottom of the magnetic shield;

fixing the pole piece on the upper surface of the magnet;

pasting damping mesh on the bottom surface of the basin stand;

fixing the soldering lug on the basin frame;

printing a printed coil and fixing the printed coil on a light heat-resistant base material;

winding the main coil on the printed coil, and fixing one end of the main coil on the sound film;

connecting the main coil and the printed coil on the soldering lug connection point;

the sound film is fixed on the basin frame.

The invention has the beneficial effects that: according to the invention, the printed coil made by low-temperature printing is added in the main coil, so that the number of turns of the coil is further increased in a limited space, the BL value of a product is increased, and the sound pressure of the buzzer under the same volume is increased.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is an exploded view of a buzzer for a vehicle instrument according to an embodiment of the present invention;

FIG. 2 is a flow chart of a method for manufacturing a buzzer for a vehicle instrument according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The buzzer for the automobile instrument as shown in fig. 1 comprises a basin frame 3, a magnetic cover 4, a magnet 5, a printed coil 7, a main coil 8, a sound film 9 and a soldering terminal 1, wherein:

the basin frame 3 is provided with a step cavity along the thickness direction, the basin frame 3 plays a role in supporting all parts and is formed by injection molding through a mold, and the step cavity is used for fixing the sound film 9 and providing a space for the vibration of the sound film 9;

the magnetic shield 4 and the basin frame 3 are integrally formed by injection, the magnetic shield 4 is of a barrel type structure, and the processing efficiency and the precision are improved by the mode of the integral injection with the basin frame 3.

The magnet 5 is fixed at the bottom of the magnetic cover 4 and used for providing a magnetic field; during specific fixing, the magnet 5 can be fixed at the bottom of the magnetic cover 4 by adopting structural adhesive; the magnet 5 is used for providing a magnetic field required by the movement of the coil;

the printed coil 7 comprises a tubular fixed substrate and a circuit printed on the fixed substrate at a low temperature; the low-temperature printing is to make the conductive line raw material into a liquid shape, print the liquid shape into a preset shape by a printer, and then irradiate and form the circuit raw material by a cold light source, so that the thickness of the printed coil 7 can be very thin by the low-temperature printing, and the sound pressure is improved on the basis of not influencing the volume of the main coil 8.

The main coil 8 is wound on the printed coil 7, the main coil 8 is a conventional enameled wire and is wound on the printed coil 7 through a winding machine, the winding method is the same as the conventional winding method, but the enameled wire is directly wound on the printed coil 7 for fixation, the original mold demoulding process is omitted, and the processing efficiency is improved;

the sound film 9 is fixedly connected with one end of the main coil 8, and the edge of the sound film is fixed on the edge of the basin stand 3; after the main coil 8 is wound, the main coil is adhered to the middle position of the bottom of the sound film 9 through glue;

the soldering lug 1 is fixed on the bottom surface of the basin frame 3 and is used for connecting the main coil 8 and the printing coil 7; the soldering lug 1 is fixed on the frame 3 in a hot pressing mode during specific fixing, is connected with the printed coil 7 and the lead of the main coil 8, and is used for connecting the coil with the outside;

the inner diameter of the printed coil 7 is larger than the outer diameter of the magnet 5, and when the printed coil 7 and the main coil 8 are electrified, the main coil 8 and the printed coil 7 reciprocate in the thickness direction of the magnet 5 to drive the sound film 9 to vibrate.

In the above embodiment, the printed coil 7 printed at a low temperature is added in the main coil 8, so that the number of turns of the coil is further increased in a limited space, and the BL value of a product is increased, thereby increasing the sound pressure of the buzzer at the same volume.

On the basis of the above embodiments, in the embodiments of the present invention, the fixed substrate is made of a PI film, and it should be noted that, because the requirement of low-temperature printing on the film is low, a thinner and lighter material may be used, for example, a TPU material may be used to further reduce the weight of the fixed substrate; in addition, since it is light and thin, in order to fix its shape, after the wiring is printed on a fixed substrate, the wiring printed on the fixed substrate is fixed on a light heat-resistant substrate, which may be a heat-resistant, light, low-cost material such as kraft paper.

In the embodiment of the invention, the circuit is printed on the inner wall or the outer wall of the fixed substrate, and can also be simultaneously fixed on the inner wall and the outer wall so as to improve the number of turns of the coil and further improve the sound pressure in the same volume; meanwhile, in order to improve the efficiency of the coil, in the embodiment of the invention, the circuit is spirally wound and printed on the inner wall or the outer wall of the fixed substrate in a single direction.

Referring to fig. 1, in the embodiment of the present invention, the bottom surface of the step cavity further has a vent hole. The vent holes are hole positions arranged on the bottom surface of the step cavity and used for air circulation when the sound film 9 vibrates, and in order to realize adjustment of vibration of the sound film 9, in the embodiment of the invention, the bottom surface of the step cavity is also fixedly provided with damping mesh cloth 2 covering the vent holes. The damping screen cloth 2 can achieve the effect of adjusting the damping of the inner cavity of the product by changing the density of the damping screen cloth, and can also play a role in preventing dust and even water.

In a preferred embodiment of the invention, the top surface of the magnet 5 also has pole pieces 6, the pole pieces 6 being used to magnetically guide the positive pole of the magnet 5 into the magnetic gap. Through the arrangement of the pole piece 6, the magnetic field distribution in the product can be optimized, so that the stress effect of the sound film 9 during vibration is further improved.

The embodiment of the invention also provides a manufacturing method of the buzzer for the automobile instrument as shown in fig. 2, which comprises the following steps:

s10: the basin stand 3 and the magnetic cover 4 are integrally molded by injection; the processing efficiency of the product is improved through integral injection molding;

s20: fixing the magnet 5 at the middle position of the bottom of the magnetic cover 4; the specific fixing mode is mentioned above, and is not described herein again;

s30: fixing the pole piece 6 on the upper surface of the magnet 5; it should be noted here that the outer diameter of the pole piece 6 is not larger than the outer diameter of the magnet 5, so as to ensure the continuity of the sound membrane 9 when vibrating;

s40: the damping mesh cloth 2 is stuck on the bottom surface of the basin stand 3;

s50: fixing the soldering lug 1 on the basin frame 3;

s60: printing a printed coil 7 and fixing the printed coil on a light heat-resistant base material;

s70: winding a main coil 8 on the printed coil 7, and fixing one end of the main coil 8 on a sound film 9;

s80: connecting wires for connecting the main coil 8 and the printing coil 7 are arranged on the connecting points of the soldering lug 1;

s90: the sound film 9 is fixed on the basin frame 3.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.