Paster type buzzer

Abstract

The utility model 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] This utility model relates to the technical field of sound-producing devices, specifically to a patch-type buzzer. Background Technology

[0002] A buzzer that converts direct current (DC) to alternating current (AC) is called an active buzzer. An active buzzer contains an oscillation circuit that converts constant DC current into pulse signals of a certain frequency, thereby achieving an alternating magnetic field and causing the buzzer to vibrate and produce sound.

[0003] To address the need for an additional conversion module to convert DC to AC in devices using buzzers, Chinese Patent No. ZL202410202293.5 discloses a novel electromagnetic buzzer with a built-in power conversion board. This power conversion board has a DC-AC conversion circuit for converting DC to AC, thus eliminating the need for an additional conversion module.

[0004] See Figure 6 Existing surface-mount active buzzers include two circuit boards 22 spaced vertically apart, with an IC chip located between the circuit boards 22. One of the circuit boards 22 is connected to a coil via bent pins 23. The two lower-spaced circuit boards 22 occupy internal space in the buzzer, resulting in a relatively high overall height. The other circuit board 22 extends to the outside of the housing via bent pins 23, which also occupy a certain amount of height space in the buzzer.

[0005] However, due to the limitations of the cavity, existing buzzers can only produce single-frequency sounds. If a buzzer needs to produce multi-frequency sounds, the internal cavity structure of the buzzer needs to be increased, which increases the overall height of the buzzer.

[0006] Therefore, further improvements are needed. Utility Model Content

[0007] This invention proposes a surface-mount buzzer with a double-layer circuit board structure. The second circuit board has a conversion element, which, together with electrical components on the second circuit board, forms a DC-AC conversion circuit for converting DC power to AC power. The first terminal board has a corresponding slot for the conversion element. When the second circuit board and the first terminal board are stacked, the conversion element is confined in the slot, so the second circuit board abuts against the first terminal board. When the buzzer uses single-frequency sound emission, the buzzer volume can be designed to be smaller. When the buzzer has the same volume as buzzers in the prior art, the internal space of the buzzer is relatively increased because the second circuit board abuts against the first terminal board, allowing it to emit multi-frequency sounds.

[0008] A surface-mount buzzer designed for this purpose includes a housing, and also includes an electromagnetic buzzer assembly and a double-layer circuit board assembly disposed on the housing.

[0009] The double-layer circuit board assembly includes a first power board and a second circuit board arranged in a stacked manner. The first power board is electrically connected to the electromagnetic buzzer component, and the second circuit board is electrically connected to the first power board.

[0010] The second circuit board has a conversion element, and the surface mount buzzer is an active buzzer; the second circuit board does not have a conversion element, and the surface mount buzzer is a passive buzzer.

[0011] The first junction board is provided with a conversion element clearance groove that runs vertically through the first junction board. The conversion element clearance groove forms a hollow part of the first junction board and is used to limit the installation of the conversion element.

[0012] The first power board has first pins on both sides, and each first pin has a first power terminal on one side that is electrically connected to the electromagnetic buzzer component; each first pin has a second power terminal on the other side that is electrically connected to the second circuit board.

[0013] The conversion element is an IC chip; the overall height of the conversion element is equivalent to the overall height of the first power board, the projection of the conversion element in the side view direction falls completely on the projection of the first power board, and the depth of the cavity of the conversion element's clearance slot is greater than the overall height of the conversion element.

[0014] The outer surfaces of the first pin and the first junction box are flush.

[0015] The second circuit board has two symmetrically spaced second pins that are confined within the housing. Each second pin has a third power terminal that is electrically connected to the first power board.

[0016] The second circuit board has two symmetrically spaced third pins that extend out of the housing. Each third pin has a fourth power terminal for connecting to an external circuit. The third pins are flush with the outer surface of the second circuit board.

[0017] The second pin and the outer surface of the second circuit board are flush.

[0018] The housing has a mounting cavity for accommodating the electromagnetic buzzer assembly and the double-layer circuit board assembly. There is a gap between one end of the electromagnetic buzzer assembly and the mounting cavity. By setting the size of this gap, the buzzer can output a sound of a corresponding frequency.

[0019] The electromagnetic buzzer assembly includes a coil disk, with leads at both ends of the coil disk electrically connected to the first contact plate.

[0020] The electromagnetic buzzer assembly also includes a magnetic ring, which is sleeved on the outside of the coil disk.

[0021] The electromagnetic buzzer assembly also includes a chassis, on which the coil disk and magnetic ring are supported.

[0022] The chassis is provided with a positioning post for positioning the coil disc; the chassis is provided with a clearance notch at the electrical connection point between the coil disc and the first electrical contact plate.

[0023] The housing opening is provided with a cover for encapsulating the electromagnetic buzzer assembly and the double-layer circuit board assembly.

[0024] The beneficial technical effects of this utility model are as follows:

[0025] The surface-mount buzzer adopts a double-layer circuit board structure. The second circuit board has a conversion element, which, together with the electrical components on the second circuit board, forms a DC-AC conversion circuit to convert DC power into AC power. The first terminal board has a corresponding slot for the conversion element. When the second circuit board and the first terminal board are stacked on top of each other, the conversion element is limited in the slot, so the second circuit board abuts against the first terminal board. When the buzzer uses single-frequency sound, the buzzer can be designed to be smaller. When the buzzer has the same volume as the buzzer in the prior art, the internal space of the buzzer is relatively increased because the second circuit board abuts against the first terminal board, and it can emit multi-frequency sounds.

[0026] The overall height of the first junction board is greater than the overall height of the conversion element. The conversion element is housed in the conversion element clearance slot of the first junction board. The double-layer circuit board assembly can be designed to be thinner, further reducing the internal structural height of the buzzer.

[0027] The above structure can be applied to both active and passive buzzers. Attached Figure Description

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0029] Figure 1 This is a three-dimensional structural diagram of a buzzer according to an embodiment of the present invention.

[0030] Figure 2 This is a three-dimensional structural diagram of a buzzer after the cover is removed, according to an embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram showing the assembly and disassembly structure of a buzzer according to an embodiment of the present invention.

[0032] Figure 4 This is a schematic diagram showing the exploded assembly structure of a buzzer according to another embodiment of the present invention.

[0033] Figure 5 This is a schematic diagram of the electrical connection structure of a buzzer according to an embodiment of the present invention.

[0034] Figure 6 This is a schematic diagram of the internal structure of a buzzer in the prior art. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. In order to make the above-mentioned objects, features and advantages of the present application more apparent and understandable, many specific details are set forth in the following description in order to provide 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 spirit of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0036] See Figures 1-4 A surface mount buzzer includes a housing 1, and also includes an electromagnetic buzzer assembly 2 and a double-layer circuit board assembly 3 disposed on the housing 1;

[0037] The double-layer circuit board assembly 3 includes a first power receiving board 4 and a second circuit board 6 arranged in a stacked manner. The first power receiving board 4 is electrically connected to the electromagnetic buzzer assembly 2, and the second circuit board 6 is electrically connected to the first power receiving board 4.

[0038] The second circuit board 6 is provided with a conversion element 7, and the surface mount buzzer is an active buzzer; the second circuit board 6 is not provided with a conversion element 7, and the surface mount buzzer is a passive buzzer.

[0039] The first power supply plate 4 is provided with a conversion element clearance groove 5 that runs vertically through the first power supply plate 4. The conversion element clearance groove 5 forms a hollow part of the first power supply plate 4 and is used to limit the installation of the conversion element 7. The second circuit board 6, which is provided with the conversion element 7, abuts against the first power supply plate 4.

[0040] The surface-mount buzzer of this application adopts a double-layer circuit board structure. 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 DC-AC conversion circuit for converting DC power into AC power. The first power board 4 is provided with a conversion element clearance slot corresponding to the conversion element 7. When the second circuit board 6 and the first power board 4 are stacked on top of each other, the conversion element is limited on the conversion element clearance slot. Therefore, the second circuit board 6 abuts against the first power board 5. When the buzzer uses single-frequency sound emission, the buzzer volume can be designed to be smaller. When the buzzer has the same volume as the buzzer in the prior art, the internal space of the buzzer is relatively increased because the second circuit board abuts against the first power board, and it can emit multi-frequency sounds.

[0041] In this embodiment, the conversion element 7 can be fixed to the second circuit board 6 by soldering so that the conversion element 7 and the second circuit board 6 form an electrical connection.

[0042] In this embodiment, the DC-AC conversion circuit is existing technology, so its circuit structure will not be described in detail here.

[0043] The specific principle is as follows:

[0044] The principle of converting direct current (DC) to alternating current (AC) is mainly achieved through something similar to an inverter. Its basic process includes an oscillating circuit, coil boosting, and waveform adjustment.

[0045] Oscillating Circuit: Direct current (DC) is converted into alternating current (AC) through an oscillating circuit. During this process, the direction of the current constantly changes, generating a square-wave AC. However, this square-wave AC cannot be directly used with capacitive and inductive loads because its waveform is not smooth, and voltage fluctuations are frequent, which may affect the lifespan of the electrical appliance.

[0046] Coil boosting: By boosting the voltage of the AC power through a coil, the voltage of the AC power is increased. This step is to ensure that the output AC power can meet the needs of different loads.

[0047] Waveform Adjustment: To convert square wave AC to sinusoidal AC, more switching cycles are needed to bring the average value closer to a sinusoidal waveform. Finally, a capacitor is added to smooth the waveform. The capacitor acts like a reservoir, storing and smoothly releasing current, thus transforming the square wave AC into sinusoidal AC.

[0048] Control chip (conversion element 7): The entire conversion process is controlled by the control chip, which can issue switching signals according to the settings to control the switching action of electronic switches (such as power MOSFETs or IGBTs). These transistors can respond quickly to the control of electronic signals to realize high-frequency switching operation.

[0049] The first power board 4 has a first pin 8 on both sides. Each first pin 8 has a first power terminal 9 on one side that is electrically connected to the electromagnetic buzzer component 2. Each first pin 8 has a second power terminal 10 on the other side that is electrically connected to the second circuit board 6.

[0050] The outer surfaces of the first pin 8 and the first power board 4 are flush, eliminating the vertical pin arrangement and further reducing the height of the internal structure of the buzzer.

[0051] 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 board 4, and the projection of the conversion element 7 in the side view direction falls completely on the projection of the first power board 4. The cavity depth of the conversion element clearance slot 5 is greater than the overall height of the conversion element 7 to avoid direct contact between the IC chip and the first power board 4.

[0052] The overall height of the first power board 4 is greater than the overall height of the conversion element 7. The conversion element 7 is housed in the conversion element clearance slot 5 of the first power board 4. The double-layer circuit board assembly 3 can be designed to be thinner, further reducing the internal structural height of the buzzer.

[0053] In this embodiment, the leads at both ends of the coil disk 16 are soldered to the corresponding pins of the first electrical board 4 to form an electrical connection.

[0054] In this embodiment, the first power board 4 is only used for electrical connection. No related electrical components are installed on the first power board 4, resulting in lower manufacturing costs.

[0055] The second circuit board 6 is provided with two second pins 11 that are symmetrically spaced and confined within the housing 1. Each second pin 11 is provided with a third power terminal 12 that is electrically connected to the first power board 4.

[0056] The second pin 11 and the outer surface of the second circuit board 6 are flush, eliminating the vertical pin arrangement and further reducing the height of the internal structure of the buzzer.

[0057] The second circuit board 6 has two symmetrically spaced third pins 13 that extend out of the outer side of the housing 1. Each third pin 13 has a fourth power terminal 14 for connecting to external circuits. The third pins 13 and the outer surface of the second circuit board 6 are flush, eliminating the vertical pin arrangement structure and further reducing the height of the internal structure of the buzzer.

[0058] The housing 1 is provided with a mounting cavity 15 for accommodating and mounting 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 mounting cavity 15. By setting the size of the gap, the buzzer can output a sound of a corresponding frequency.

[0059] Because the overall height between the first power board 4 and the second circuit board 6 is reduced, the volume of the housing 1 is relatively smaller than that of existing buzzers. The housing 1 and the magnetic ring 17 are spaced accordingly, allowing for the emission of a single-frequency sound. Conversely, when the volume of the housing 1 is designed to be the same as that of existing buzzers, the internal space of the housing 1 is relatively larger, allowing for the emission of multi-frequency sounds.

[0060] The electromagnetic buzzer assembly 2 includes a coil disk 16, with leads at both ends of the coil disk 16 electrically connected to the first power board 4.

[0061] In this embodiment, the coil disk 16 includes a coil frame and a plurality of turns of coil wound on the coil frame.

[0062] The electromagnetic buzzer assembly 2 also includes a magnetic ring 17, which is sleeved on the outside of the coil disk 16.

[0063] In this embodiment, the magnetic ring 17 is provided with an annular cavity, and the coil disk 16 is limited within the annular cavity.

[0064] The electromagnetic buzzer assembly 2 also includes a chassis 18, on which the coil disk 16 and the magnetic ring 17 are supported.

[0065] The chassis 18 is provided with a positioning post 19 for positioning the coil disk 16; the chassis 18 is provided with a clearance notch 20 at the electrical connection point between the coil disk 16 and the first electrical contact plate 4.

[0066] In this embodiment, the lead wires of the coil disk 16 and the pins of the first contact plate 4 extend to the clearance notch 20 for solder connection.

[0067] The positioning frame of the coil disk 16 is provided with positioning holes, and the positioning pin 19 is inserted into the positioning holes.

[0068] The housing 1 has a cover 21 at the opening for encapsulating the electromagnetic buzzer assembly 2 and the double-layer circuit board assembly 3.

[0069] In this embodiment, after the electromagnetic buzzer assembly 2 and the double-layer circuit board assembly 3 are assembled, they can be placed in a mold used to manufacture the housing 1, so that the electromagnetic buzzer assembly 2, the double-layer circuit board assembly and the housing 1 are formed into an inseparable whole through injection molding.

[0070] Alternatively, the housing 1 can be manufactured independently using a mold, and then the electromagnetic buzzer assembly 2 and the double-layer circuit board assembly 3 can be installed inside the housing 1.

Claims

1. A patch buzzer, comprising a housing (1), characterized in that: It also includes an electromagnetic buzzer assembly (2) and a double-layer circuit board assembly (3) placed on the housing (1). The double-layer circuit board assembly (3) includes a first power board (4) and a second circuit board (6) arranged in a stacked manner. The first power board (4) is electrically connected to the electromagnetic buzzer assembly (2), and the second circuit board (6) is electrically connected to the first power board (4). The second circuit board (6) is provided with a conversion element (7) for converting DC drive current into AC drive current. The surface mount buzzer is an active buzzer. The second circuit board (6) is not provided with a conversion element (7). The surface mount buzzer is a passive buzzer. The first electrical contact plate (4) is provided with a conversion element clearance groove (5), which forms a hollow part of the first electrical contact plate (4) and is used to limit the installation of the conversion element (7).

2. The patch-type buzzer according to claim 1, characterized in that: The first power board (4) has first pins (8) on both sides. Each first pin (8) has a first power terminal (9) on one side that is electrically connected to the electromagnetic buzzer assembly (2); and a second power terminal (10) on the other side that is electrically connected to the second circuit board (6). 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 board (4), the projection of the conversion element (7) in the side view direction falls completely on the projection of the first power board (4), and the depth of the cavity of the conversion element clearance slot (5) is greater than the overall height of the conversion element (7). The outer surfaces of the first pin (8) and the first terminal board (4) are flush.

3. The patch-type buzzer according to claim 1, characterized in that: The second circuit board (6) is provided with two second pins (11) that are symmetrically spaced and confined within the housing (1). Each second pin (11) is provided with a third terminal (12) that is electrically connected to the first power board (4). The second pin (11) and the second circuit board (6) are flush with each other on their outer surfaces.

4. The patch-type buzzer according to claim 1, characterized in that: The second circuit board (6) is provided with two symmetrically spaced third pins (13) that extend out of the outer side of the housing (1). Each third pin (13) is provided with a fourth power terminal (14) for connecting to an external circuit. The outer surfaces of the third pins (13) and the second circuit board (6) are flush.

5. The patch-type buzzer according to claim 1, characterized in that: The housing (1) is provided with a mounting cavity (15) for accommodating 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 mounting cavity (15). By setting the size of the gap, the buzzer outputs a sound of a corresponding frequency.

6. The patch-type buzzer according to claim 1, characterized in that: The electromagnetic buzzer assembly (2) includes a coil disk (16), and the leads at both ends of the coil disk (16) are electrically connected to the first power board (4).

7. The patch-type buzzer according to claim 6, characterized in that: The electromagnetic buzzer assembly (2) also includes a magnetic ring (17), which is sleeved on the outside of the coil disk (16).

8. The patch buzzer according to claim 7, characterized in that: The electromagnetic buzzer assembly (2) also includes a chassis (18), on which a coil disk (16) and a magnetic ring (17) are supported.

9. The patch buzzer according to claim 8, characterized in that: The chassis (18) is provided with a positioning post (19) for positioning the coil disc (16); the chassis (18) is provided with a clearance notch (20) at the electrical connection between the coil disc (16) and the first electrical contact plate (4).

10. The patch buzzer according to claim 1, characterized in that: The housing (1) has a cover (21) at the opening for encapsulating the electromagnetic buzzer assembly (2) and the double-layer circuit board assembly (3).

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