TWM597025U - Electroacoustic element structure suitable for being mounted on PCB - Google Patents

Abstract

The present invention provides an electroacoustic component structure suitable for installation on a PCB, which includes a shell seat in which the plurality of sound generating components are installed, and a base on which the at least two conductive terminals are installed is placed in a reflow furnace in advance. The at least two conductive terminals can be adhered to at least two contacts on the PCB to be electrically connected to each other, wherein a connection portion is formed at one end of the shell base, a pair of connection portions are formed at one end of the base, the shell base and the base can be The outside of the reflow furnace is integrated with each other via the connecting portion and the butting portion, so that the at least two conductive terminals are electrically connected to at least one of the plurality of sound-emitting components, so that Separate and assemble electro-acoustic components inside and outside of the reflow furnace to avoid affecting the electrical characteristics of the electro-acoustic components due to the high temperature baking effect of the reflow furnace.

Description

Electroacoustic component structure suitable for installation on PCB

The present invention relates to the structure and installation technology of electroacoustic components, in particular to an electroacoustic component structure suitable for installation on a PCB.

The electroacoustic components generally referred to include piezoelectric buzzer, magnetic buzzer, dynamic speaker and the like. Among them, the piezoelectric buzzer uses the piezoelectric effect of piezoelectric ceramics to drive the vibrating membrane to generate vibration and sound, and the electromagnetic buzzer uses electromagnetic to drive the metal vibrating membrane to generate vibration and generate sound during energization and non-energization. However, the moving coil horn uses the magnetic field effect generated by the energization of the coil to drive the diaphragm to vibrate and then sound. Therefore, the electro-acoustic components are generally assembled on the PCB and emit sound through the driving of the conductive loop provided by the circuit layer of the PCB.

It is well known that when assembling electronic components such as ICs and electroacoustic components on a PCB, they generally rely on surface mount technology (SMT), first printing solder paste on the surface of the circuit layer of the PCB, and then sucking the electronic components with the aid of a suction cup such as an automatic arm. Insert the PCB on the PCB, and then use a reflow oven (such as: IR oven) to solder the electronic components and solder paste that have been inserted on the PCB surface, so that the electronic components can be firmly adhered to the circuit layer surface of the PCB. In order to conduct the conductive circuit of each electronic component on the PCB.

The electroacoustic components in the above electronic components are usually composed of a sound assembly necessary for assembling in a housing. The electroacoustic element is, for example, a piezoelectric buzzer as an example, and the sound-generating component to be mounted in the housing includes a piezoelectric buzzer (piezoelectric ceramic element), a diaphragm (diaphragm), and a circuit board (circuit board) and conductive terminals, etc. These sound-generating components must withstand The reflow oven is baked at a high temperature of about 245°C. In this high temperature environment, in addition to testing the temperature resistance characteristics of the shell material, it will also affect the sound components such as piezoelectric buzzers, diaphragms, circuit boards, etc. Electrical characteristics.

Faced with this problem, today's industry can only use materials that are more able to withstand the high temperature of the above reflow soldering furnace to make the casing and sound-emitting components of the electro-acoustic element, but it increases the production cost of the electro-acoustic element improve.

The purpose of this new model is to minimize the effects of high-temperature baking of reflow ovens on the housing of electroacoustic components and their built-in sound-producing components to maintain the electrical characteristics of these components.

To this end, a preferred embodiment of the present invention aims to provide an electroacoustic element structure suitable for mounting on a PCB, including the shell base and the base; a cavity is formed inside the shell base for mounting the multiple Sound-generating components, and the base on which the at least two conductive terminals are installed is placed in a reflow oven in advance, so that the at least two conductive terminals and at least two contacts on the PCB can be adhered to each other to be electrically connected; wherein, A connecting portion is formed at one end of the shell base, and a mating portion for coupling the connecting portion is formed at one end of the base, the shell base and the base can be outside the reflow furnace through the connecting portion and the butting portion Are integrated with each other, so that the at least two conductive terminals are electrically connected to at least one of the plurality of sound-emitting components.

In a further implementation, the shell base includes a base body and a set of seat covers provided on the base body, and the cavity is formed in the base body. With such an implementation, it is easier to install the sound-generating component in the housing.

In a further implementation, the at least two conductive terminals are respectively bent into a J-shaped body and exposed on two opposite end surfaces of the base, so as to be electrically connected to at least one of the contacts on the PCB and the plurality of sound-emitting components.

In the implementation of the above structure, the electroacoustic element may be one of a piezoelectric buzzer, an electromagnetic buzzer, and a moving coil horn. In addition, only the base needs to be made of heat-resistant plastic, and both the base and the sound-emitting component can be excluded from being made of heat-resistant plastic.

According to the above technical means, the overall effectiveness of the new model can be improved by maintaining the electrical characteristics of the electro-acoustic components that are adhesively mounted on the PCB, including the piezoelectric buzzer, vibrating membrane and circuit board among the electro-acoustic components The electrical characteristics of other components; in addition, the new model can also be used to eliminate the use of temperature-resistant materials to make the shell of the electroacoustic device (including the seat body and the cover), the piezoelectric buzzer, the diaphragm and the circuit board And other components, thus reducing the production cost of the electroacoustic element.

In addition, the relevant technical details on which the new model can be implemented will be described in subsequent embodiments and drawings.

10, 60, 70

11, 61, 71

11a, 61a, 71a

11b, 61b, 71b seat cover

111‧‧‧ chamber

112‧‧‧First opening

113‧‧‧ Connection

114‧‧‧sound hole

115‧‧‧Fixed board

116‧‧‧Second opening

117‧‧‧Limit post

118‧‧‧ Sponge

12, 62, 72 ‧‧‧ base

12a‧‧‧Outer end

12b‧‧‧End wall

12c‧‧‧Inner end

121‧‧‧ Docking Department

122‧‧‧Notch

20‧‧‧Sounding component

21‧‧‧ Piezoelectric buzzer

22, 22a, 22b

23, 23a, 23b ‧‧‧ circuit board

231, 311, 321‧‧‧ line terminal

24‧‧‧coil

25‧‧‧ magnetic pole

26、261‧‧‧Magnet

27‧‧‧ Printed Circuit Electrode

281‧‧‧Polarized coil

282‧‧‧ voice coil

30, 31, 32 ‧‧‧ conductive terminals

40‧‧‧PCB

41‧‧‧Contact

50‧‧‧Reflow oven

Steps from S1 to S3‧‧‧ Examples

Figure 1 is a step program diagram of the new installation method.

2a to 2e are schematic diagrams of the operations of the installation method of FIG. 1 respectively.

FIG. 3 is an exploded perspective view of the first structural embodiment of the present invention, illustrating an implementation manner in which a piezoelectric buzzer is used as an electroacoustic element.

4 is an exploded perspective view of the base of FIG. 3 from another perspective.

FIG. 5 is a schematic perspective view of the components in FIG. 3 after being assembled.

6 is an enlarged cross-sectional view of FIG. 5.

7 is a cross-sectional view of the second structural embodiment of the present invention, illustrating the implementation of the electromagnetic buzzer as an electroacoustic element.

FIG. 8 is a cross-sectional view of the third structural embodiment of the present invention, illustrating an implementation manner in which a moving coil horn is used as an electroacoustic element.

Please refer to FIG. 1 to illustrate that the structure of the electro-acoustic element suitable for installation on the PCB provided by the present invention can be easily implemented through a method suitable for mounting the electro-acoustic element on the PCB. The method includes sequentially performing the following steps S1 to S3:

Step S1: Separate the housing of the electroacoustic component

Please refer to FIG. 2a to illustrate that the plastic injection molding technology is used to pre-construct the housing 10 of the electroacoustic element, which can be independent in advance and can be integrated into one. A shell seat 11 and a base 12. Wherein, the housing base 11 is pre-installed with a plurality of sound-generating components 20 that are susceptible to the electrical characteristics affected by high temperature, the plurality of sound-generating components 20 includes at least one circuit board 23, and the base 12 is pre-installed with at least two conductive Terminal 30. The base 12 is made of heat-resistant plastic in the implementation, and the housing 11 and the sound-emitting assembly 20 are made of heat-resistant plastic in the implementation. The heat-resistant plastic refers to a plastic that can withstand baking at a high temperature of about 245°C in a reflow oven.

Step S2: Adhering the base and the PCB

Please refer to FIG. 2b and FIG. 2c in order to illustrate that solder paste is printed on the contact 41 of the PCB 40, and then the base 12 is captured and placed on the PCB 40 by using, for example, an automatic arm (as shown in FIG. 2b), The conductive terminals 30 on the base 12 are brought into contact with the contacts 41 on the PCB 40, and then the PCB 40 is moved into a reflow furnace 50 (as shown in FIG. 2c). The baking at high temperature melts the solder paste, so that the conductive terminals 30 on the base 12 and the contacts 41 on the PCB 40 can be adhered to each other and electrically connected.

Step S3: Combining the housing and the base

Please refer to FIG. 2d and FIG. 2e in order to illustrate that the PCB 40 with the base 12 adhered is taken out of the reflow oven 50, so that the PCB 40 with the base 12 adhered is away from the high temperature in the reflow oven 50 and can be used at normal temperature. Or at room temperature, the housing 11 is captured by, for example, an automatic arm, and the housing 11 is pressed or screwed onto the base 12 that has been adhered to the PCB 40 (as shown in FIG. 2d), and when When the housing 11 and the base 12 are integrated into one body, the conductive terminals 30 on the base 12 can be electrically connected to the two circuit terminals 231 on the circuit board 23 in the housing 11 to form an electrical connection An integrated electroacoustic element on the PCB 40 (as shown in Figure 2e). In this way, it is possible to prevent the housing base 11 and the plurality of sound emitting components 20 installed in the housing base 11 from being subjected to high temperature intrusion in the reflow furnace 50.

On the other hand, please refer to FIG. 3 to FIG. 6 to disclose the first structural embodiment of the present invention using a piezoelectric buzzer as an electroacoustic element, illustrating that the structure of the piezoelectric buzzer includes the above-mentioned shell The base 11, the base 12 and a plurality of sound generating components 20. among them:

A cavity 111 for mounting the plurality of sound generating components 20 is formed in the shell base 11, and a connecting portion 113 is formed on the shell wall at one end of the shell base 11. In this embodiment, the sound-generating component 20 includes a well-known piezoelectric buzzer 21 made of piezoelectric ceramics, a vibrating membrane 22, a circuit board 23, etc.; wherein, the vibrating membrane 22 is made to reciprocate The shape of the cone is circular, and the peripheral edge of the diaphragm 22 is fixed to the wall surface of the chamber 111. The central basin area of the piezoelectric buzzer 21 is attached to the diaphragm 22, and the piezoelectric buzzer 21 is electrically connected to the The circuit board 23 is further externally connected to the power supply end, so as to use the piezoelectric effect of the piezoelectric buzzer 21 to drive the vibrating membrane 22 to vibrate and sound.

In order to consider the convenience of assembling the sound-emitting assembly 20 in the housing 11, the housing 11 may be implemented as a seat 11 a and a set of seat covers 11 b provided on the seat 11 a; wherein, the chamber 111 is formed in the seat In the body 11a, the chamber 111 has a fixing plate 115. The fixing plate 115 can be fixed in the seat body 11a by press-fitting, or integrally formed by the wall surface of the chamber 111 of the seat body 11a, so as to use the cavity A fixing plate 115 in the chamber 111 is used to fix the circuit board 23; both ends of the seat 11a form a first opening 112 and a second opening 116 respectively, and the connecting portion 113 may be singular or plural, and A ring-shaped or spaced-open form is formed on the seat 11a around the first opening 112; the second opening 116 of the seat 11a communicates with the chamber 111, and the seat cover 11b is assembled by, for example, pressing Located in the second opening 116, the diaphragm 23 is disposed between the seat body 11a and the seat cover 11b and sits in the chamber 111; the seat cover 11b is formed with at least one sound-permeable hole 114, the piezoelectric honeycomb The sound emitted when the sounding piece 21 vibrates is transmitted to the outside through the sound-transmitting hole 114.

In addition, the base 12 is formed in a disk cover shape that can cover one end of the housing 11, and an end surface of the base 12 is formed with a docking portion 121 for coupling the connection portion 113. Wherein, the connecting portion 113 and the butting portion 121 can be implemented as a combination of a locking rib and a locking groove with male and female snapping capabilities, or as a coupling with a relatively locked thread.

When the connecting portion 113 and the docking portion 121 are implemented as a combination of the locking ribs and the locking grooves of the male and female snaps as shown in FIGS. 3 to 5, the above-mentioned automatic arm for capturing the housing 11 only needs to perform alignment Press the buckle action, you can combine the shell 11 with the buckle On the base 12 of the PCB 40; when the connection portion 113 and the docking portion 121 are implemented in a combined form of screwing relative locking (common screw connection technology application, it is not shown), the above is used to extract the housing 11 The robotic arm only needs to perform an alignment rotation action to press-fit the housing 11 to the base 12 of the PCB 40. In terms of the control technology of the automatic arm at the present stage, the above two combination methods can make the housing 11 allow the conductive terminal 30 and the line terminal 231 to be accurately aligned with the positive and negative directions and stable Sexual connection.

Furthermore, at least one notch 122 is formed in the docking portion 121. When the housing 11 and the base 12 are integrated into one body, the connecting portion 113 can be pushed through the notch 122 with a tool, so that the connecting portion 113 and the docking portion 121 can no longer maintain the combined state, and thus the housing 11 can be separated from the base 12.

Furthermore, the two conductive terminals 30 are set on the base 12, and the two conductive terminals 30 can be bent from a metal sheet to form a J-shaped body, so that each of the conductive terminals 30 can be sequentially transferred from the base The outer end surface 12a and the end wall 12b of the 12 extend to the inner end surface 12c of the base 12 and are buckled and fixed on the base 12, so that the two ends of the conductive terminal 30 can be exposed on the two opposite end surfaces of the base 12 (outside On the end surface 12a and the inner end surface 12c), so that the two ends of the conductive terminal 30 can be electrically connected to the circuit terminal 231 of the circuit board 23 and the contact 41 on the PCB 40, respectively. According to this, when the PCB 40 is energized, an excitation voltage can be output to the piezoelectric buzzer 21 through the circuit board 23 in the piezoelectric buzzer (ie, the electroacoustic element), so that it is attached to the flexible diaphragm The buzzer 21 in the heart area of 22 generates a vibration frequency and then makes a sound.

The two circuit terminals 231 on the circuit board 23 may be made of elastic elements such as spiral compression springs, and the two circuit terminals 231 have positive and negative directions. When the housing 11 and the base 12 are integrated into one body, the two circuit terminals 231 can be in close contact with the two conductive terminals 30 on the base 12 according to the needs of the positive and negative conductive paths to maintain the two Electrical connection.

Please refer to FIG. 3 and FIG. 6 again. A limit post 117 is formed on the seat cover 11b. The limit post 117 extends from the seat cover 11b into the seat body 11a (that is, in the chamber 111) to limit vibration The amplitude of the membrane 22. There is a fixed on the fixing plate 115 Sponge 118. The sponge 118 can be regarded as an accessory of the sound-generating component 20, and is disposed in the housing 11 together with the sound-generating component 20, so as to be protected from the high temperature interference of the reflow soldering furnace. The piezoelectric buzzer 21 is located Between the limit post 117 and the sponge 118. Thereby, the piezoelectric buzzer 21 can maintain the stability of the stable vibration frequency due to the restraint of the sponge 118 and the limit post 117 when vibrating.

Please continue to refer to FIG. 7 to reveal the second structural embodiment of the present invention that uses an electromagnetic buzzer as an electroacoustic element, illustrating the structure of the electromagnetic buzzer and the maximum of the first piezoelectric buzzer described above The difference is that the multiple sound-emitting components 20 installed in the housing 61 of the housing 60 are replaced by the well-known circuit board 23a electrically connecting the coil 24 and the corresponding magnetic pole 25, magnet 26 and diaphragm 22a. , And the second line terminal 311 is made of elastic elements other than the helical compression spring. In detail, the second line terminal 311 is formed by bending the conductive terminal 30 on the base 12 into a tilted arm shape so as to be When the base 61 and the base 62 are integrated into one body, the two circuit terminals 311 can be electrically connected to the positive and negative contacts on the circuit board 23a according to their positive and negative directions. In addition, the internal structure of the housing 61 formed by the combination of the seat body 61a and the seat cover 61b will be matched accordingly to install the above-mentioned sound-emitting assembly 20, so that the electromagnetic buzzer can use the coil 24 during energization and non-energization The vibration between the magnetic pole 25 and the magnet 26 causes the diaphragm 22a to vibrate and sound. Except for this, the remaining structure and installation method of this embodiment are almost the same as those of the first embodiment. In particular, this embodiment is completely suitable for applying the above-mentioned method of the present invention to perform the steps of installing electroacoustic components on a PCB.

Please continue to refer to FIG. 8 to reveal the third structural embodiment of the present invention that uses a moving coil horn as an electroacoustic element, illustrating the biggest difference between the structure of the moving coil horn and the first piezoelectric buzzer described above , A plurality of sound-generating components 20 installed in the housing 71 of the housing 70 are replaced by a well-known electrical connection between the printed circuit electrode 27, the polarizing coil 281, and the sound coil 282, and the corresponding magnet 261, The diaphragm 22b and the like are replaced. Among them, the printed circuit electrode 27 is used to replace the circuit board of the first and second embodiments described above, and the two circuit terminals 321 are changed from the conductive terminals 32 on the base 72 to be bent into a tilted arm shape so as to be When the base 71 and the base 72 are integrated into one body, the two line terminals 321 can be electrically connected to the printed circuit electrode 27. this In addition, the internal structure of the housing 71 formed by the combination of the seat body 71a and the seat cover 71b will be matched accordingly to install the above sound-emitting assembly 20, so that the moving coil horn can use the printed circuit electrode 27 to excite the polarized coil 281 and The sound coil 282 generates a magnetic field effect to drive the diaphragm 22b to vibrate and sound. Except for this, the remaining structure and installation method of this embodiment are almost the same as those of the first embodiment. In particular, this embodiment is completely suitable for applying the above-mentioned method of the present invention to perform the steps of mounting electroacoustic components on a PCB.

The above examples merely express the preferred embodiments of the present invention, but they should not be construed as limiting the scope of the patent of the present invention. Therefore, this new model shall be subject to the content of the claims defined in the scope of patent application.

10‧‧‧Housing

11‧‧‧Shell

11a‧‧‧Body

11b‧‧‧seat cover

111‧‧‧ chamber

112‧‧‧First opening

113‧‧‧ Connection

114‧‧‧sound hole

115‧‧‧Fixed board

116‧‧‧Second opening

117‧‧‧Limit post

118‧‧‧ Sponge

12‧‧‧Dock

12a‧‧‧Outer end

12b‧‧‧End wall

121‧‧‧ Docking Department

122‧‧‧Notch

20‧‧‧Sounding component

21‧‧‧ Piezoelectric buzzer

22‧‧‧Vibrating membrane

23‧‧‧ circuit board

231‧‧‧Line terminal

30‧‧‧Conductive terminal

Claims (10)

An electroacoustic component structure suitable for installation on a PCB, including: A shell seat, a cavity is formed inside, and a plurality of sound-producing components are installed in the cavity; A base, installed with at least two conductive terminals, the at least two conductive terminals can be adhered to and electrically connected to at least two contacts on the PCB; Wherein, one end of the shell base is formed with a connecting portion, and one end of the base is formed with a mating portion for coupling the connecting portion, and the mating portion is integrated with each other via the connecting portion to make the at least two conductive The terminal is electrically connected to at least one of the plurality of sound emitting components. The electroacoustic element structure suitable for mounting on a PCB as described in claim 1, wherein the shell base includes a base and a set of seat covers provided on the base, and the cavity is formed in the base. The electroacoustic element structure suitable for being mounted on a PCB according to claim 1, wherein the at least two conductive terminals are respectively bent into a J-shaped body and exposed on two opposite end surfaces of the base. The electroacoustic element structure suitable for mounting on a PCB as described in any one of claims 1 to 3, wherein the electroacoustic element is a piezoelectric buzzer. The electroacoustic element structure suitable for being mounted on a PCB according to claim 4, wherein the plurality of sound-emitting components installed in the housing includes a circuit board having elastic contacts for the at least two conductive terminals When at least two circuit terminals are integrated into the housing and the base, the circuit board in the housing is electrically connected to the conductive terminals on the base via the circuit terminals. The electroacoustic element structure suitable for mounting on a PCB as described in any one of claims 1 to 3, wherein the electroacoustic element is an electromagnetic buzzer. The electroacoustic element structure suitable for mounting on a PCB as described in claim 6, wherein the plurality of sound-emitting components installed in the housing includes a circuit board, and the conductive terminals on the base are bent to form an oblique arm warp At least two circuit terminals in a raised form, when the shell base and the base are integrated into one, the circuit board in the shell base is lifted through the base The line terminal is electrically connected to the conductive terminal. The electroacoustic element structure suitable for mounting on a PCB as described in any one of claims 1 to 3, wherein the electroacoustic element is a moving coil horn. The electroacoustic element structure suitable for being mounted on a PCB as described in claim 8, wherein the plurality of sound emitting components installed in the housing includes a printed circuit electrode, and the conductive terminals on the base are bent to form oblique arms When at least two circuit terminals in a raised shape are integrated into the housing and the base, the printed circuit electrodes in the housing are electrically connected to the conductive terminals via the circuit terminals raised on the base. The electroacoustic element structure suitable for mounting on a PCB as described in claim 1, wherein the base is made of heat-resistant plastic, and the housing and the sound-emitting component are excluded from being made of heat-resistant plastic.

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