Paster type buzzer

Abstract

The invention relates to the technical field of sound production instruments, and provides a patch type buzzer, which adopts a double-layer circuit board structure, a second circuit board is provided with a conversion element, and the conversion element and an electric appliance element on the second circuit board form a direct current-alternating current conversion circuit for converting direct current into alternating current. When the second circuit board and the first power connection board are stacked up and down, the conversion element is limited on the conversion element receding groove, so that the second circuit board abuts against the first power connection board, and when the buzzer adopts single-frequency sound production, the size of the buzzer can be designed to be smaller, and the buzzer can be more compact. When the volume of the buzzer is the same as that of a buzzer in the prior art, the internal space of the buzzer is relatively increased due to the fact that the second circuit board abuts against the first power connection board, and multi-frequency sound can be made.

Description

Technical Field

[0001] The present invention relates to the technical field of sound - generating devices, and particularly to a patch - type buzzer. Background Art

[0002] A buzzer that converts direct current into alternating current is called an active buzzer. The active buzzer contains an oscillation circuit inside, which can convert constant direct current into a pulsed signal of a certain frequency, thereby achieving an alternating magnetic field and driving the buzzer to vibrate and produce sound.

[0003] To solve the problem of the need to additionally set a conversion module on the device using a buzzer to convert direct current into alternating current, Chinese Patent No. ZL202410202293.5 discloses a new type of electromagnetic buzzer, which is internally provided with a power supply conversion board. The power supply conversion board is provided with a direct - to - alternating conversion circuit for converting direct current into alternating current, so that there is no need to additionally set a conversion module.

[0004] See Figure 6 , the existing patch - type active buzzer includes two circuit boards 22 arranged at an upper - lower interval. An IC chip is arranged between the circuit boards 22. One of the circuit boards 22 is connected to a coil through a bent lead 23. The two circuit boards 22 arranged at a lower interval occupy the internal space of the buzzer, resulting in a relatively high overall height of the buzzer. The other circuit board 22 extends to the outside of the housing through the bent lead 23, and the bent lead 23 also occupies a certain height space of the buzzer.

[0005] However, due to the limitation of the cavity, the existing buzzer can only emit a single - frequency sound. If the buzzer needs to emit multi - frequency sounds, the internal cavity structure of the buzzer needs to be increased, and then the overall height of the buzzer increases.

[0006] Therefore, further improvement is needed. Summary of the Invention

[0007] The present invention provides a patch - type buzzer, which adopts a double - layer circuit board structure. The second circuit board is provided with a conversion element. The conversion element and the electrical components on the second circuit board form a direct - to - alternating conversion circuit for converting direct current into alternating current. The first circuit board is provided with a conversion - element clearance groove corresponding to the conversion element. When the second circuit board and the first circuit board are stacked up and down, the conversion element is limited on the conversion - element clearance groove, so that the second circuit board abuts against the first circuit board. When the buzzer emits a single - frequency sound, the volume of the buzzer can be designed to be smaller. When the volume of the buzzer is the same as that of the existing buzzer, since the second circuit board abuts against the first circuit board, the internal space of the buzzer relatively increases, and multi - frequency sounds can be emitted.

[0008] A patch - type buzzer designed according to this purpose includes a housing, and also includes an electromagnetic buzzer assembly and a double - layer circuit board assembly placed on the housing; The double-layer circuit board assembly includes a first power connection board and a second circuit board arranged in a stacked manner. The first power connection board is electrically connected to the electromagnetic buzzer assembly, and the second circuit board is electrically connected to the first power connection board. A conversion element is provided on the second circuit board. If the surface mount buzzer is an active buzzer, no conversion element is provided on the second circuit board. If the surface mount buzzer is a passive buzzer, a conversion element is provided on the second circuit board. A conversion element clearance groove that penetrates the first power connection board vertically is provided on the first power connection board. The conversion element clearance groove forms a hollowed-out portion of the first power connection board and is used to limit and install the conversion element.

[0009] First pins are provided on both sides of the first power connection board. A first power connection end electrically connected to the electromagnetic buzzer assembly is provided on one side of each first pin; a second power connection end electrically connected to the second circuit board is provided on the other side of each first pin. The conversion element is an IC chip; the overall height of the conversion element is equivalent to the overall height of the first power connection board. The projection of the conversion element in the side view direction completely falls within the projection of the first power connection board. The cavity depth of the conversion element clearance groove is greater than the overall height of the conversion element. The outer surfaces of the first pins and the first power connection board are flush with each other.

[0010] Two second pins that are symmetrically arranged at intervals and are limited within the housing are provided on the second circuit board. A third power connection end electrically connected to the first power connection board is provided on each second pin.

[0011] Two third pins that are symmetrically arranged at intervals and extend outside the housing are provided on the second circuit board. A fourth power connection end for connecting to an external circuit is provided on each third pin; the outer surfaces of the third pins and the second circuit board are flush with each other.

[0012] The outer surfaces of the second pins and the second circuit board are flush with each other.

[0013] The housing is provided with an installation cavity for accommodating and installing the electromagnetic buzzer assembly and the double-layer circuit board assembly. A gap is provided between one end of the electromagnetic buzzer assembly and the installation cavity. By setting the size of this gap, the buzzer outputs a sound of a corresponding frequency.

[0014] The electromagnetic buzzer assembly includes a coil disc, and the lead-out wires at both ends of the coil disc are respectively electrically connected to the first power connection board.

[0015] The electromagnetic buzzer assembly further includes a magnetic ring, and the magnetic ring is sleeved outside the coil disc.

[0016] The electromagnetic buzzer assembly further includes a chassis, and the coil disc and the magnetic ring are supported on the chassis.

[0017] The chassis is provided with positioning posts for positioning the coil disk; a clearance notch is provided on the chassis corresponding to the electrical connection between the coil disk and the first power connection board.

[0018] A face cover for encapsulating the electromagnetic buzzer assembly and the double-layer circuit board assembly is provided at the opening of the housing.

[0019] The beneficial technical effects of the present invention are as follows: The surface-mounted buzzer adopts a double-layer circuit board structure. The second circuit board is provided with a conversion element. The conversion element and the electrical components on the second circuit board form a direct-to-alternating conversion circuit for converting direct current into alternating current. The first power connection board is provided with a conversion element clearance groove corresponding to the conversion element. When the second circuit board and the first power connection board are stacked up and down, the conversion element is limited on the conversion element clearance groove. Therefore, the second circuit board abuts against the first power connection board. When the buzzer emits a single-frequency sound, the volume of the buzzer can be designed to be smaller. When the volume of the buzzer is the same as that of the buzzer in the prior art, due to the second circuit board abutting against the first power connection board, the internal space of the buzzer is relatively increased, and multi-frequency sounds can be emitted.

[0020] The overall height of the first power connection board is greater than the overall height of the conversion element. The conversion element is received in the conversion element clearance groove of the first power connection board, and the double-layer circuit board assembly can be designed to be thinner, further reducing the internal structure height of the buzzer.

[0021] The above structure can be applied to an active buzzer or a passive buzzer. Description of the Drawings

[0022] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0023] Figure 1 It is a three-dimensional structure schematic diagram of a buzzer according to an embodiment of the present invention.

[0024] Figure 2 It is a three-dimensional structure schematic diagram of a buzzer after removing the cover according to an embodiment of the present invention.

[0025] Figure 3 It is an assembly and disassembly structure schematic diagram of a buzzer according to an embodiment of the present invention.

[0026] Figure 4 It is another azimuth assembly and disassembly structure schematic diagram of a buzzer according to an embodiment of the present invention.

[0027] Figure 5 It is an electrical connection structure schematic diagram of a buzzer according to an embodiment of the present invention.

[0028] Figure 6 It is an internal structure schematic diagram of a buzzer in the prior art. Specific Embodiments

[0029] The following will describe the technical solutions in the embodiments of the present invention clearly and completely in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. In order to make the above-mentioned objects, features, and advantages of the present application more obvious and understandable, many specific details are set forth in the following description for a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0030] See Figures 1-4 , a patch buzzer, including a housing 1, and further including an electromagnetic buzzer assembly 2 and a double-layer circuit board assembly 3 disposed on the housing 1; The double-layer circuit board assembly 3 includes a first power connection board 4 and a second circuit board 6 arranged in a stacked manner. The first power connection board 4 is electrically connected to the electromagnetic buzzer assembly 2, and the second circuit board 6 is electrically connected to the first power connection board 4; A conversion element 7 is provided on the second circuit board 6. When the patch buzzer is an active buzzer, the conversion element 7 is not provided on the second circuit board 6, and the patch buzzer is a passive buzzer; A conversion element clearance groove 5 that penetrates the first power connection board 4 up and down is provided on the first power connection board 4. The conversion element clearance groove 5 forms a hollowed-out portion of the first power connection board 4 and is used for limiting and installing the conversion element 7. The second circuit board 6 provided with the conversion element 7 abuts against the first power connection board 4.

[0031] The patch buzzer of the present application adopts a double-layer circuit board structure. Among them, the second circuit board 6 is provided with a conversion element 7. The conversion element 7 and the electrical components on the second circuit board 6 form a direct-to-alternating conversion circuit for converting direct current into alternating current. The first power connection board 4 is provided with a conversion element clearance groove corresponding to the conversion element 7. When the second circuit board 6 and the first power connection board 4 are stacked up and down, the conversion element is limited in the conversion element clearance groove. Therefore, the second circuit board 6 abuts against the first power connection board 5. When the buzzer emits a single-frequency sound, the volume of the buzzer can be designed to be smaller. When the volume of the buzzer is the same as that of the buzzer in the prior art, since the second circuit board abuts against the first power connection board, the internal space of the buzzer is relatively increased, and multi-frequency sounds can be emitted.

[0032] In this embodiment, the conversion element 7 can be fixed on the second circuit board 6 by soldering so that the conversion element 7 forms an electrical connection with the second circuit board 6.

[0033] In this embodiment, the direct-to-alternating conversion circuit for converting direct current into alternating current is a prior art, so no excessive detailed description will be made on the circuit structure here.

[0034] The specific principle is as follows: The principle of converting direct current into alternating current is mainly achieved through a device similar to an inverter. Its basic process includes an oscillation circuit, coil voltage boost, and waveform adjustment. ‌Oscillation circuit‌: Direct current is converted into alternating current through an oscillation circuit. During this process, the direction of the current will keep switching, generating square-wave alternating current. However, this square-wave alternating current cannot be directly used for capacitive and inductive loads because its waveform is not smooth and the voltage mutation is frequent, which may affect the lifespan of electrical appliances.

[0035] ‌Coil voltage boost‌: Through coil voltage boost, the voltage of the obtained alternating current is increased. This step is to ensure that the output alternating current can meet the requirements of different loads.

[0036] ‌Waveform adjustment‌: In order to convert square-wave alternating current into sinusoidal alternating current, more switching operations are needed to make the average value close to the sinusoidal waveform. Finally, a capacitor is added to smooth the waveform. The role of the capacitor is equivalent to a reservoir, which can store and release current smoothly, thus converting square-wave alternating current into sinusoidal alternating current.

[0037] ‌Control chip (conversion element 7)‌: The entire conversion process is controlled by a control chip, which can send out switching signals according to the setting to control the switching actions of electronic switches (such as power MOS transistors or IGBTs). These transistors can quickly respond to the control of electronic signals to achieve high-frequency switching operations.

[0038] Both sides of the first power connection board 4 are provided with first pins 8. One side of each first pin 8 is provided with a first power connection end 9 electrically connected to the electromagnetic buzzer component 2; the other side of each first pin 8 is provided with a second power connection end 10 electrically connected to the second circuit board 6.

[0039] The outer surfaces of the first pins 8 and the first power connection board 4 are flush with each other, canceling the structure with the pins arranged vertically, and further reducing the height of the internal structure of the buzzer.

[0040] The conversion element 7 is an IC chip; the overall height of the conversion element 7 is equivalent to the overall height of the first power connection board 4. The projection of the conversion element 7 in the side view direction completely falls on the projection of the first power connection board 4. The cavity depth of the conversion element clearance groove 5 of the conversion element is greater than the overall height of the conversion element 7 to prevent the IC chip from making direct contact with the first power connection board 4.

[0041] The overall height of the first power connection board 4 is greater than the overall height of the conversion element 7. The conversion element 7 is accommodated in the conversion element clearance groove 5 of the first power connection board 4, and the double-layer circuit board assembly 3 can be designed to be thinner, further reducing the height of the internal structure of the buzzer.

[0042] In this embodiment, the lead wires at both ends of the coil disc 16 are respectively soldered and fixed to the corresponding pins of the first power connection board 4 to form an electrical connection.

[0043] In this embodiment, the first power connection board 4 is only used for electrical connection, and no related electrical components are provided on the first power connection board 4, so the production and manufacturing cost is relatively low.

[0044] Two second pins 11 which are symmetrically arranged at intervals are provided on the second circuit board 6 and are limited within the housing 1, and a third power connection end 12 electrically connected to the first power connection board 4 is provided on each second pin 11.

[0045] The outer surfaces of the second pin 11 and the second circuit board 6 are flush with each other, and the structure of the vertically arranged pin is cancelled, further reducing the internal structure height of the buzzer.

[0046] Two third pins 13 which are symmetrically arranged at intervals and extend outside the housing 1 are provided on the second circuit board 6, and a fourth power connection end 14 for connecting an external circuit is provided on each third pin 13. The outer surfaces of the third pin 13 and the second circuit board 6 are flush with each other, and the structure of the vertically arranged pin is cancelled, further reducing the internal structure height of the buzzer.

[0047] The housing 1 is provided with an installation cavity 15 for accommodating and installing the electromagnetic buzzer assembly 2 and the double-layer circuit board assembly 3. A gap is provided between one end of the electromagnetic buzzer assembly 2 and the installation cavity 15. By setting the size of this gap, the buzzer outputs a sound with a corresponding frequency.

[0048] Since the overall height between the first power connection board 4 and the second circuit board 6 becomes smaller, when the volume of the housing 1 is designed to be relatively smaller than that of the existing buzzer, there is a corresponding interval between the housing 1 and the magnetic ring 17, and a single-frequency sound can be emitted. When the volume of the housing 1 is designed to be the same as that of the existing buzzer, the internal space of the housing 1 becomes relatively larger, and a multi-frequency sound can be emitted.

[0049] The electromagnetic buzzer assembly 2 includes a coil disc 16, and the lead wires at both ends of the coil disc 16 are respectively electrically connected to the first power connection board 4.

[0050] In this embodiment, the coil disc 16 includes a coil skeleton and a plurality of turns of coils wound on the coil skeleton.

[0051] The electromagnetic buzzer assembly 2 further includes a magnetic ring 17, and the magnetic ring 17 is sleeved on the outside of the coil disc 16.

[0052] In this embodiment, the magnetic ring 17 is provided with an annular cavity, and the coil disc 16 is limited within the annular cavity.

[0053] The electromagnetic buzzer assembly 2 further includes a chassis 18, and the coil disc 16 and the magnetic ring 17 are supported on the chassis 18.

[0054] The chassis 18 is provided with positioning posts 19 for positioning the coil disc 16; a clearance notch 20 is provided on the chassis 18 corresponding to the electrical connection between the coil disc 16 and the first power connection board 4.

[0055] In this embodiment, the lead wire of the coil disc 16 and the pin of the first power connection board 4 extend to the clearance notch 20 for soldering connection.

[0056] The positioning skeleton of the coil disc 16 is provided with positioning holes, and the positioning posts 19 are inserted into the positioning holes.

[0057] A face cover 21 for encapsulating the electromagnetic buzzer assembly 2 and the double-layer circuit board assembly 3 is provided at the opening of the housing 1.

[0058] In this embodiment, after the electromagnetic buzzer assembly 2 and the double-layer circuit board assembly 3 are assembled, they can be placed in the mold for manufacturing the housing 1, so that the electromagnetic buzzer assembly 2, the double-layer circuit board assembly and the housing 1 form an inseparable whole through injection molding.

[0059] Alternatively, the housing 1 is independently manufactured through a mold alone, and then the electromagnetic buzzer assembly 2 and the double-layer circuit board assembly 3 are installed in the housing 1.

Claims

1. A patch buzzer, comprising a housing (1), characterized in that: It further includes an electromagnetic buzzer assembly (2) and a double-layer circuit board assembly (3) disposed on the housing (1); The double-layer circuit board assembly (3) includes a first power connection board (4) and a second circuit board (6) arranged in a stacked manner. The first power connection board (4) is electrically connected to the electromagnetic buzzer assembly (2), and the second circuit board (6) is electrically connected to the first power connection board (4); A conversion element (7) for converting a DC drive current into an AC drive current is provided on the second circuit board (6). If the surface-mounted buzzer is an active buzzer, the conversion element (7) is not provided on the second circuit board (6). If the surface-mounted buzzer is a passive buzzer, the conversion element (7) is provided on the second circuit board (6); A conversion element clearance groove (5) is provided on the first power connection board (4). The conversion element clearance groove (5) forms a hollowed-out portion of the first power connection board (4) and is used for limiting and installing the conversion element (7).

2. The patch buzzer according to claim 1, wherein: First pins (8) are provided on both sides of the first power connection board (4). A first power connection terminal (9) electrically connected to the electromagnetic buzzer assembly (2) is provided on one side of each first pin (8); a second power connection terminal (10) electrically connected to the second circuit board (6) is provided on the other side of each first pin (8); The conversion element (7) is an IC chip; the overall height of the conversion element (7) is comparable to the overall height of the first power connection board (4). The projection of the conversion element (7) in the side view direction completely falls on the projection of the first power connection board (4). The cavity depth of the conversion element clearance groove (5) is greater than the overall height of the conversion element (7); The outer surfaces of the first pins (8) and the first power connection board (4) are flush with each other.

3. The patch buzzer according to claim 1, wherein: Two second pins (11) are provided on the second circuit board (6), which are symmetrically arranged at intervals and are limited within the housing (1). A third power connection terminal (12) electrically connected to the first power connection board (4) is provided on each second pin (11); The outer surfaces of the second pins (11) and the second circuit board (6) are flush with each other.

4. The patch buzzer according to claim 1, wherein: Two third pins (13) are provided on the second circuit board (6), which are symmetrically arranged at intervals and extend outside the housing (1). A fourth power connection terminal (14) for connecting an external circuit is provided on each third pin (13); the outer surfaces of the third pins (13) and the second circuit board (6) are flush with each other.

5. The patch buzzer according to claim 1, wherein: The housing (1) is provided with an installation cavity (15) for accommodating and installing the electromagnetic buzzer assembly (2) and the double-layer circuit board assembly (3). There is a gap between one end of the electromagnetic buzzer assembly (2) and the installation cavity (15). By setting the size of this gap, the buzzer outputs a sound with a corresponding frequency.

6. The patch buzzer according to claim 1, wherein: The electromagnetic buzzer assembly (2) includes a coil disk (16), and the lead-out wires at both ends of the coil disk (16) are respectively electrically connected to the first power connection board (4).

7. The patch buzzer according to claim 6, wherein: The electromagnetic buzzer assembly (2) further includes a magnetic ring (17), and the magnetic ring (17) is sleeved outside the coil disk (16).

8. The patch buzzer according to claim 7, wherein: The electromagnetic buzzer assembly (2) further includes a chassis (18), and the coil disk (16) and the magnetic ring (17) are supported on the chassis (18).

9. The patch buzzer according to claim 8, wherein: The chassis (18) is provided with positioning posts (19) for positioning the coil disc (16); a clearance notch (20) is provided on the chassis (18) corresponding to the electrical connection between the coil disc (16) and the first power connection board (4).

10. The patch buzzer according to claim 1, wherein: A face cover (21) for encapsulating the electromagnetic buzzer assembly (2) and the double-layer circuit board assembly (3) is provided at the opening of the housing (1).

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