Multifunctional SMD active piezoelectric buzzer

Abstract

The utility model belongs to a sounding component in the electroacoustic field, and particularly relates to a multifunctional SMD active piezoelectric buzzer, which comprises a shell upper cover, a high-temperature-resistant buzzing sheet, a miniature packaged special piezoelectric buzzer driving integrated circuit, two miniature pagoda springs, a metal lead frame and a shell base, the high-temperature-resistant buzzer is characterized in that the high-temperature-resistant buzzer is installed at a step of the shell upper cover and is sealed and fixed through silica gel, a sounding hole is formed in the shell upper cover, a sounding cavity is formed between the high-temperature-resistant buzzer and the shell upper cover, and the metal lead frame and the shell base are integrally formed through die pressing. The metal lead frame and the top of the shell base form a plane, a connecting rib of the metal lead frame extends to the outside of the shell base and is bent downwards to form a product pin, and the device solves the problems that a current multifunctional active SMD piezoelectric buzzer product is single in function, cannot be directly connected and communicated with a single-chip microcomputer and is low in sound pressure.

Description

Technical Field

[0001] The utility model belongs to a sound-generating component in the field of electroacoustics, and specifically discloses a multifunctional SMD active piezoelectric buzzer. Background Art

[0002] SMD piezoelectric buzzer is an electroacoustic component with low driving power consumption and good reliability. It is widely used in various portable home health products, instruments and meters, various office equipment, automotive electronics, digital products, electronic door locks, smart homes, Internet of Things and other fields to play a prompt and warning role.

[0003] At present, the mainstream products on the market are still passive SMD piezoelectric buzzers, which have single functions, cannot directly connect and communicate with the microcontroller, and have low sound pressure. Utility Model Content

[0004] The purpose of the utility model is to provide a multifunctional SMD active piezoelectric buzzer to solve the problems raised in the above background technology. The utility model provides the following technical solutions:

[0005] A multifunctional SMD active piezoelectric buzzer comprises an upper shell cover, a high temperature resistant buzzer sheet, a micro-packaged dedicated piezoelectric buzzer driver integrated circuit, two micro pagoda springs, a metal lead frame and a shell base, wherein the high temperature resistant buzzer sheet is installed at the step of the upper shell cover and is fixed by a silicone seal, a sound hole is provided inside the upper shell cover, and a sound cavity is formed between the high temperature resistant buzzer sheet and the upper shell cover.

[0006] Preferably, the metal lead frame and the shell base are integrally molded, the metal lead frame and the top of the shell base form a plane, and the connecting ribs of the metal lead frame extend to the outside of the shell base and are bent downward to become product pins.

[0007] Preferably, the surface of the metal lead frame is provided with printed solder paste, and the pins of the micro-packaged dedicated piezoelectric buzzer driver integrated circuit and the two micro-pagoda springs are bonded to the printed solder paste on the surface of the metal lead frame, and an electrical connection is formed by heating, melting and curing.

[0008] Preferably, the outer shell upper cover and the outer shell base are bonded by heating and curing glue.

[0009] Preferably, the two micro-pagoda springs are in contact with the two poles of the high temperature resistant buzzer sheet respectively and are electrically connected.

[0010] Preferably, the extended portion of the connecting rib of the metal lead frame is sheared and bent by a die to form an external pin of the buzzer.

[0011] Preferably, the outside of the buzzer is respectively provided with a positive power supply electrode VDD, a negative power supply electrode VSS, an enable terminal EN, and a DIN signal input terminal.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0013] The utility model combines the conventional passive SMD piezoelectric buzzer injection molding process with the precision electronic assembly SMT process, electrically connects the dedicated piezoelectric buzzer driver integrated circuit with the lead frame, and does not require metal welding wire connection and manual assembly, which greatly improves the production efficiency and product integration effect, reduces production costs, and improves product reliability. The output sound pressure of the buzzer is improved through the dedicated integrated circuit, and it can be directly connected to the single-chip computer for communication. Through the software algorithm, various sound effects can be generated to meet the different modern electronic products and personalized needs of customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a structural cross-sectional view of the utility model;

[0016] Figure 2 It is a schematic diagram of a high temperature resistant buzzer sheet of the utility model;

[0017] Figure 3 This is a schematic diagram of the packaging of the multifunctional piezoelectric buzzer driver integrated circuit of the utility model;

[0018] Figure 4 This is a structural diagram of the connection between the multifunctional piezoelectric buzzer driving integrated circuit, the metal pagoda spring and the base plane lead frame of the utility model;

[0019] Figure 5 This is the application electrical schematic diagram of the utility model multifunctional SMD active piezoelectric buzzer;

[0020] In the figure: 1. Shell cover; 2. High temperature resistant buzzer; 3. Micro-packaged dedicated piezoelectric buzzer driver integrated circuit; 4. Micro pagoda spring; 5. Metal lead frame; 6. Shell base. DETAILED DESCRIPTION

[0021] The following is a further non-limiting detailed description of the technical solution of the utility model in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-5 The utility model provides a technical solution: a multifunctional SMD active piezoelectric buzzer, including a housing cover 1, a high temperature resistant buzzer sheet 2, a micro-packaged dedicated piezoelectric buzzer driver integrated circuit 3, two micro-pagoda springs 4, a metal lead frame 5 and a housing base 6;

[0023] The multifunctional active SMD piezoelectric buzzer, the upper cover 1 of the shell is made of LCP material resistant to high temperature of 300 degrees by injection molding, and two steps are formed inside; a layer of anaerobic silica gel is applied on the first step by a glue machine, and then the high temperature resistant buzzer piece 2 is placed on the step for sealing and fixing; a rectangular sounding hole is opened on the top of the upper cover 1 of the shell, and a resonant sounding cavity is formed between the high temperature resistant buzzer piece 2 and the inside of the upper cover 1 of the shell;

[0024] The metal lead frame 5 is made of copper, brass or copper alloy strip with a thickness of 0.1-0.15 mm through an etching process or a stamping process;

[0025] The housing base 6 uses the metal lead frame 5 as an insert and is integrally molded by LCP material. The metal lead frame 5 and the top of the housing base 6 form a plane. The connecting ribs of the metal lead frame 5 extend several millimeters outside the housing base 6 and are bent downward to form product pins.

[0026] The SMT assembly process is used to selectively print solder paste on the metal lead frame 5 on the surface of the housing base 6, and the pins of the micro-packaged dedicated piezoelectric buzzer driver integrated circuit 3 and the bottoms of the two micro-pagoda springs 4 are precisely aligned and bonded to the solder paste part, and then melted and solidified in a reflow oven to form an electrical connection;

[0027] High temperature resistant glue is applied around the second step of the upper cover 1 of the housing, and the housing base 6 is aligned and embedded flat, and then bonded into one piece by heating and curing;

[0028] After the housing cover 1 is bonded to the housing base 6, two metal pagoda springs 4 fixed to the metal lead frame 5 on the surface of the housing base 6 form two drive output pins VO1 and V02 of the electric buzzer driver integrated circuit, and correspond to the two poles of the high temperature resistant buzzer sheet 2 respectively, so as to be in close contact and electrically connected;

[0029] The extended part of the connection rib of the metal lead frame 5 which is molded and embedded in the housing base 6 is cut by a mold to form four external pins, which respectively correspond to the positive power supply VDD, the negative power supply VSS, the enable terminal EN, and the DIN signal input terminal of the buzzer. The four pins are formed into a J-shaped foot by a mold;

[0030] The conventional passive SMD piezoelectric buzzer injection molding process is combined with the precision electronic assembly SMT process, and the dedicated piezoelectric buzzer driver integrated circuit is electrically connected to the lead frame. There is no need for metal welding wire connection and manual assembly, which greatly improves the production efficiency and product integration effect, reduces production costs, and improves product reliability. The output sound pressure of the buzzer is improved through the dedicated integrated circuit, and it can be directly connected to the single-chip computer for communication. Through software algorithms, various sound effects can be generated to meet the different modern electronic products and personalized needs of customers.

[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0032] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit them. Although the utility model is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A multifunctional SMD active piezoelectric buzzer, comprising a housing cover (1), a high temperature resistant buzzer sheet (2), a micro-packaged dedicated piezoelectric buzzer driver integrated circuit (3), two micro pagoda springs (4), a metal lead frame (5) and a housing base (6), characterized in that: The high temperature resistant buzzer (2) is installed on the step of the housing upper cover (1) and is fixed by means of silicone seal. A sound hole is provided inside the housing upper cover (1), and a sound cavity is formed between the high temperature resistant buzzer (2) and the housing upper cover (1).

2. The multifunctional SMD active piezoelectric buzzer according to claim 1, characterized in that: The metal lead frame (5) and the shell base (6) are formed by integral molding, the metal lead frame (5) and the top of the shell base (6) form a plane, and the connecting ribs of the metal lead frame (5) extend to the outside of the shell base (6) and are bent downward to form product pins.

3. The multifunctional SMD active piezoelectric buzzer according to claim 2, characterized in that: The surface of the metal lead frame (5) is provided with printed solder paste, and the pins of the micro-packaged dedicated piezoelectric buzzer driving integrated circuit (3) and the two micro-pagoda springs (4) are bonded to the printed solder paste on the surface of the metal lead frame (5), and an electrical connection is formed by heating, melting and solidifying.

4. The multifunctional SMD active piezoelectric buzzer according to claim 3, characterized in that: The outer shell upper cover (1) and the outer shell base (6) are bonded by heating and curing glue.

5. The multifunctional SMD active piezoelectric buzzer according to claim 4, characterized in that: The two miniature pagoda springs (4) are in contact with the two poles of the high temperature resistant buzzer sheet (2) respectively, and are electrically connected.

6. The multifunctional SMD active piezoelectric buzzer according to claim 5, characterized in that: The extended portion of the connecting rib of the metal lead frame (5) is sheared and bent by a die to form an external pin of the buzzer.

7. The multifunctional SMD active piezoelectric buzzer according to claim 6, characterized in that: The outside of the buzzer is respectively provided with a positive power supply electrode VDD, a negative power supply electrode VSS, an enable terminal EN, and a DIN signal input terminal.

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