CN209880145U

CN209880145U - Active SMD piezoelectric buzzer

Info

Publication number: CN209880145U
Application number: CN201920432605.6U
Authority: CN
Inventors: 周鸣放
Original assignee: Dongcun Electronics Co Ltd Changzhou
Current assignee: Dongcun Electronics Co Ltd Changzhou
Priority date: 2019-04-02
Filing date: 2019-04-02
Publication date: 2019-12-31
Anticipated expiration: 2029-04-02

Abstract

The utility model relates to an active SMD piezoelectric buzzer, which comprises a shell, a piezoelectric ceramic buzzer piece, a spring support, a conductive spring and a driving circuit board, wherein the shell is matched with the driving circuit board to form a working cavity; the spring support is used for fixing the conductive spring; and the two conductive springs are used for realizing the electrical connection between the piezoelectric ceramic buzzer and the driving circuit board. The utility model discloses simple structure, small, sound production performance is superior, the consumption is little and production facility, use extensively.

Description

Active SMD piezoelectric buzzer

Technical Field

The utility model relates to a buzzer specifically discloses an active SMD piezoelectric type buzzer.

Background

At present, the volumes and the installation spaces of various electronic products such as large and small household appliances, office equipment, handheld medical equipment, instruments and meters, personal health products, Internet of things and the like are more and more compact, the automatic assembly technology is more mature, the use amount of the SMD piezoelectric buzzer with the functions of prompting and alarming is more and more large, and the SMD piezoelectric buzzer gradually replaces a common buzzer with pins and welding wires. At present, a passive SMD piezoelectric buzzer with a small volume is still taken as a mainstream, a control element is required to be additionally arranged outside, the occupied space is large, and the sound pressure often cannot meet the actual use requirement; the active SMD piezoelectric buzzer provided by some manufacturers has a large volume, only has positive and negative power pins, needs additional switch elements outside, and has high production cost and low market acceptance rate.

SUMMERY OF THE UTILITY MODEL

The invention of the utility model aims to: in order to solve the problems, the active SMD piezoelectric buzzer is simple in structure, small in size, excellent in sound production performance, low in power consumption, convenient to produce and wide in application.

The utility model discloses a technical scheme be like:

an active SMD piezoelectric buzzer comprises a shell, a piezoelectric ceramic buzzer piece, a spring support, a conductive spring and a driving circuit board, wherein the shell and the driving circuit board are matched to form a working cavity; the spring support is used for fixing the conductive spring; and the two conductive springs are used for realizing the electrical connection between the piezoelectric ceramic buzzer and the driving circuit board.

Further, the housing is rectangular or circular, and correspondingly, the spring holder is rectangular or circular.

Furthermore, a first step and a second step are formed on the inner side of the shell and are respectively used for fixing the piezoelectric ceramic buzzer piece and the spring support.

Furthermore, the drive circuit board adopts a double-sided PCB, the front side of the drive circuit board is pasted with an ASIC chip, the back side of the drive circuit board is distributed with a plurality of external pins, and the external pins are electrically connected with the output end of the front side ASIC chip.

Further, the external pin includes one or two combinations of a control terminal CTRL, a signal input terminal DIN, and a voltage-doubling selection terminal EN, in addition to a power supply positive electrode VCC and a power supply negative electrode VSS.

Furthermore, the conductive spring is a conical spring with different diameters at two ends.

To sum up, owing to adopt above-mentioned technical scheme, the beneficial effects of the utility model are that:

the utility model relates to an active SMD piezoelectric buzzer which has simple structure, convenient large-scale and automatic manufacture and controllable cost; one or two combinations of external functional pins such as a pin control end CTRL, a signal input end DIN, a voltage doubling selection end EN and the like can be directly matched with an I/O port of the single chip microcomputer, so that intermediate control elements are saved, the use cost and the installation space of the whole product are further reduced, various sound production effects can be realized through software of the single chip microcomputer, and larger imagination and development space are brought to engineers.

Drawings

FIG. 1 is a structural split view of the present invention;

FIG. 2 is a top view of the present invention;

fig. 3 is a schematic view of the structure a-a in fig. 2.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in FIGS. 1 to 3, an active SMD piezoelectric buzzer comprises a housing 1, a piezoelectric ceramic buzzer 2, a spring support 3, a conductive spring 4 and a driving circuit board 5,

the shell 1 is matched with the driving circuit board 5 to form a working cavity, and the piezoelectric ceramic buzzer piece 2, the spring support 3 and the conductive spring 4 are arranged in the working cavity; the housing 1 is rectangular, and correspondingly, the spring support 3 is rectangular, and one corner of the rectangular housing is provided with a chamfer of 45 degrees, so that the identification and positioning of the external pin 52 of the buzzer are facilitated.

A first step 11 and a second step 12 are formed on the inner side of the shell 1 and are respectively used for fixing the piezoelectric ceramic buzzer piece 2 and the spring support 3; the piezoelectric ceramic buzzer piece 2 is fixed on the first step 11 by adopting a special glue for a buzzer and forms a sounding cavity with the shell 1; the spring support 3 is fixed on the second step 12 by adopting glue bonding or clamping fit.

The spring support 3 is used for fixing the conductive spring 4; the number of the conductive springs 4 is two, and the conductive springs are conical springs with different diameters at two ends; the small diameter ends of the two conductive springs 4 are respectively and elastically connected with the piezoelectric ceramic buzzer 2 metal substrate and the ceramic substrate, and the large diameter ends are elastically connected with the two output ends of the ASIC chip 51.

The drive circuit board 5 adopts a double-sided PCB board, an ASIC chip 51 (and a plurality of resistance and capacitance elements) is pasted on the front side, a plurality of external pins 52 are distributed on the back side, and the external pins 52 are electrically connected with the output end of the front side ASIC chip 51 through metal hole formation. The surface of the driving circuit board 5 hidden in the working cavity is a front surface, and the exposed surface is a back surface. The external pin 52 comprises a power supply anode VCC, a power supply cathode VSS, one or two combinations of a control terminal CTRL, a signal input terminal DIN and a voltage doubling selection terminal EN, and the functional pins can be connected with an I/O port of the single chip microcomputer to realize intelligent control of dormancy, multiple sound effects and sound pressure.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. An active SMD piezoelectric buzzer, its characterized in that: the piezoelectric ceramic buzzer piece, the spring support, the conductive spring and the driving circuit board are arranged in the working cavity; the spring support is used for fixing the conductive spring; and the two conductive springs are used for realizing the electrical connection between the piezoelectric ceramic buzzer and the driving circuit board.

2. An active SMD piezoelectric buzzer in accordance with claim 1, characterized by: the housing is rectangular or circular and, correspondingly, the spring support is rectangular or circular.

3. An active SMD piezoelectric buzzer in accordance with claim 1, characterized by: and a first step and a second step are formed on the inner side of the shell and are respectively used for fixing the piezoelectric ceramic buzzer piece and the spring support.

4. An active SMD piezoelectric buzzer in accordance with claim 1, characterized by: the drive circuit board adopts a double-sided PCB board, an ASIC chip is pasted on the front side, a plurality of external pins are distributed on the back side, and the external pins are electrically connected with the output end of the front side ASIC chip.

5. An active SMD piezoelectric buzzer in accordance with claim 4, further comprising: the external pin comprises a power supply anode VCC, a power supply cathode VSS, and one or two combinations of a control terminal CTRL, a signal input terminal DIN and a voltage doubling selection terminal EN.

6. An active SMD piezoelectric buzzer in accordance with claim 1, characterized by: the conductive spring is a conical spring with different diameters at two ends.