CN108111946B - Vibration sound production structure and terminal - Google Patents

Abstract

The invention discloses a vibration sounding structure which comprises a shell, a first fixing edge, a second fixing edge, a vibration plate, a coupling gasket and a piezoelectric speaker, wherein the first fixing edge and the second fixing edge are respectively coated at two opposite ends of the shell, the first fixing edge and the second fixing edge respectively comprise a first folding edge and a second folding edge which are arranged in a bending mode, the first folding edge and the second folding edge are arranged oppositely and extend towards each other, the vibration plate is connected with the first folding edge and the second folding edge, a gap is formed between the vibration plate and the shell, the coupling gasket is arranged in the gap, and the piezoelectric speaker is attached to an area where the shell and the coupling gasket are connected, so that the vibration energy is transmitted to the vibration plate through the coupling gasket and the effect of generating sound waves is achieved. The vibration sounding structure provided by the invention can transmit the vibration energy of the piezoelectric loudspeaker to the vibration plate through the coupling gasket, can generate high-efficiency sound waves through the vibration of the vibration plate, and can improve the sensitivity.

Description

Vibration sounding structure and terminal

technical field

The present invention relates to the technical field of electronic products, and in particular, to a vibration sounding structure and a terminal.

Background technique

A loudspeaker is an electro-mechanical-sound transducer, which is an important element in audio equipment. Speakers are widely used in people's daily life, bringing a lot of convenience. In the fields of electronic products such as automobiles, radio, TV, speakers, mobile phones, MP4, and computers, the application of speakers can be seen almost everywhere. There are many types of speakers, which can be divided into electric type (ie moving coil type), electrostatic type (ie capacitive type), electromagnetic type (ie reed type), piezoelectric type and so on according to their energy conversion principle; Divided into woofers, mid-range speakers, and tweeters, among which moving coil speakers are the most widely used. Because of its small, thin and light characteristics, piezoelectric speakers have extremely bright prospects and futures under the current trend of device miniaturization.

At present, the basic principle of the vibration and sound part of most piezoelectric speakers is: the electrodes are connected to alternating current, and due to the inverse piezoelectric effect, the piezoelectric ceramic sheet vibrates, causing the metal diaphragm to bend and deform, thereby generating vibration, which in turn pushes the air to vibrate. Generates sound pressure and makes sound.

Compared with traditional dynamic speakers, piezoelectric speakers have the following advantages:

1. There is no need for magnets in the piezoelectric speaker structure, so there will be no magnetic field that interferes and affects the surrounding circuits, and will not absorb dust particles from the surrounding space.

2. The thickness of the piezoelectric speaker is ultra-thin. Compared with the moving coil speaker, the piezoelectric speaker can be installed in a flatter space, which makes it extremely competitive in today's market;

3. Piezoelectric speakers are lightweight, generally less than 1g in weight, 50%-80% lighter than traditional dynamic speakers;

4. The power consumption of piezoelectric speakers is low, generally less than 15mW, which is 1/5-1/2 of the power consumption of moving coil speakers, which greatly prolongs the battery life of the device;

5. The acoustic design of the piezoelectric speaker is simple, requiring little space on the back, and even no cavity for raising the sound pressure level, which is necessary for dynamic speakers.

Although piezoelectric speakers have the above advantages, the first-order resonance frequency of piezoelectric speakers (the frequency corresponding to a peak of the frequency response curve) is generally high, the low-frequency characteristics are slightly worse, and the low-frequency bandwidth is narrow, that is, the bass reproduction effect is poor. In addition, the sound pressure frequency response curve of the existing piezoelectric speaker generally has relatively severe fluctuations in the intermediate frequency band, resulting in high harmonic distortion, poor sound quality, and low sensitivity.

SUMMARY OF THE INVENTION

In view of this, the present invention is aimed at the deficiencies in the prior art, and its main purpose is to provide a vibration sounding structure and a terminal with good bass reproduction effect, good sound quality and high sensitivity.

In order to achieve the above object, on the one hand, the present invention provides a vibration sound-emitting structure, the vibration-sounding structure comprises:

A shell, a first fixed edge, a second fixed edge, a vibration plate, a coupling pad and a piezoelectric speaker, the first fixed edge and the second fixed edge are respectively covered on opposite ends of the shell, so The first fixed edge and the second fixed edge respectively include a first folded edge and a second folded edge arranged by bending, the first folded edge and the second folded edge are oppositely arranged and extend toward each other, and the first folded edge There is a gap between the edge and the second folded edge and the shell, the vibration plate is connected to the first folded edge and the second folded edge, and there is a gap between the vibration plate and the shell, The coupling gasket is arranged in the gap between the vibration plate and the casing to be pressed between the casing and the vibration plate, and the piezoelectric speaker is arranged inside the casing, The piezoelectric speaker is attached to the area of the casing connected with the coupling pad, so as to achieve the effect of transmitting vibration energy to the vibration plate through the coupling pad and generating sound waves.

Wherein, the volume of the piezoelectric speaker is larger than the volume of the coupling pad, and the piezoelectric speaker covers the contact area between the coupling pad and the housing.

Wherein, the first folded edge and the second folded edge are both S-shaped or wave-shaped.

Wherein, the vibration plate is integrally formed with the first folded edge and the second folded edge.

Wherein, the vibration plate is bonded to the first folding edge and the second folding edge.

Wherein, the coupling pad is adhered to the vibration plate, and is in pressing contact with the casing.

Wherein, the coupling pad is bonded to the center of the vibration plate.

Wherein, the material of the coupling gasket is silica gel, rubber or foam.

Wherein, the first fixed edge and the second fixed edge are bonded to opposite ends of the casing.

Wherein, the first fixed side and the second fixed side are both concave shaped strips.

Wherein, the first folded edge and the second folded edge extend along the width direction of the casing.

On the other hand, an embodiment of the present invention further provides a terminal, where the terminal includes a terminal body and the above-mentioned vibration-sounding structure, and the vibration-sounding structure is electrically connected to the terminal body.

In the vibration sounding structure provided by the present invention, the two ends of the casing are covered by the first fixed edge and the second fixed edge, and the first fixed edge and the second fixed edge are provided with the first folding edge and The second folded edge, and then the vibration plate is connected to the first folded edge and the second folded edge, so that there can be a gap between the vibration plate and the shell, so as to ensure sufficient vibration space and balance the vibration, and then connect the coupling pad The sheet is placed in the gap, and then the piezoelectric speaker is attached to the area where the shell and the coupling pad are connected, and the vibration energy of the piezoelectric speaker is transmitted to the vibration plate through the coupling pad, so that the vibration plate can be forced to vibrate Generates sound waves, which in turn make sounds. By adopting the above method, the bass reproduction effect of the piezoelectric speaker can be enhanced, the sound quality is better and the sensitivity is also high.

Description of drawings

In order to illustrate the structural features and effects of the present invention more clearly, the following detailed description will be given in conjunction with the accompanying drawings and specific embodiments.

FIG. 1 is a schematic structural diagram of a vibration-sounding structure provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Referring to FIG. 1 , a terminal provided by the present invention includes a terminal main body (not marked in the figure) and a vibration sounding structure 100 , and the vibration sounding structure 100 is electrically connected to the terminal main body.

In this embodiment, the terminal may be an intelligent terminal device such as a mobile phone and a tablet computer. In this embodiment, the terminal is a mobile phone as an example for description.

The terminal body may include a main board, a touch screen assembly, a display screen assembly, a battery, etc., and the touch screen assembly, the display screen assembly and the battery are all electrically connected to the main board.

The vibration-sounding structure 100 is electrically connected to the main board. The vibration-sounding structure 100 includes a casing 10 , a first fixed side 20 , a second fixed side 30 , a vibration plate 40 , a coupling pad 50 and a piezoelectric speaker 60 . The first fixing edge 20 and the second fixing edge 30 are respectively covered on opposite ends of the casing 10 . The first fixed edge 20 and the second fixed edge 30 respectively include a first folded edge 21 and a second folded edge 31 arranged by bending, and the first folded edge 21 and the second folded edge 31 are oppositely arranged and extend toward each other. . The vibration plate 40 is connected to the first folding edge 20 and the second folding edge 30 , and there is a gap 41 between the vibration plate 40 and the casing 10 . The coupling pad 50 is arranged in the gap 41 , and the piezoelectric speaker 60 is attached to the area where the casing 10 and the coupling pad 50 are connected, so as to realize the The vibration energy is transmitted to the vibration plate 40 and produces the effect of sound waves.

In the vibration sounding structure 100 provided by the embodiment of the present invention, the first fixed side 20 and the second fixed side 30 are covered on both ends of the casing 10, and the first fixed side 20 and the second fixed side 30 are respectively provided with bending Set the first folded edge 21 and the second folded edge 31, then set the vibration plate 40 to connect the first folded edge 21 and the second folded edge 31, and then set the coupling gasket 50 on the vibration plate 40 to connect the piezoelectric speaker. 60 is arranged inside the housing 10, and the vibration energy of the piezoelectric speaker 60 is transmitted to the vibration plate 40 through the coupling gasket 50, and the sound wave is generated by the vibration of the vibration plate 40. Since the vibration plate 40 is an efficient vibration, The sound conversion structure can make the final output sound good quality and high sensitivity. In addition, the first folded edge 21 and the second folded edge 31 are used, so that both sides of the vibration plate 40 can have sufficient vibration space, and can balance the vibration and improve the sound quality.

Specifically, the casing 10 may be a mobile phone casing, such as a mobile phone rear casing. The material of the casing 10 may be metal or plastic.

The first fixing edge 20 covers one end of the casing 10 . In this embodiment, the first fixing edge 20 is a concave-shaped strip, and the concave portion of the first fixing edge 20 is covered and attached to one end of the casing 10 . Specifically, the first fixing edge 20 is bonded to one end of the casing 10 . Preferably, in order to facilitate fixing, the first fixing edge 20 is adhered to one end of the housing 10 by glue or double-sided tape, so as to prevent the first fixing edge 20 from being separated from the housing 10 .

Further, the material of the first fixed edge 20 may be a polymer material such as silica gel, rubber, bakelite, ethylene glycol dicarboxylate (PEN), polyether ketone fiber (PEEK), etc., so as to facilitate molding.

In this embodiment, the first folded edge 21 extends from one end of the first fixed edge 20 , and the first folded edge 21 is an S-shaped or wavy shape, so as to enable the vibration The two sides of the board 40 can have sufficient vibration space, and can balance the vibration and improve the audio quality. Specifically, the first folded edge 21 can be integrally formed on the first fixed edge 20, or the first folded edge 21 can also be adhered to the first fixed edge 20, so as to be integrated with the first fixed edge 20. The effect that the first fixed side 20 is not separated is described. In addition, in order to ensure sufficient vibration space, the first folded edge 21 extends along the width direction of the housing 10, and there is a gap between the first folded edge 21 and the housing 10, so as to facilitate subsequent The gap 41 can be formed between the vibration plate 40 and the casing 10 .

The second fixing edge 30 covers the other end of the casing 10 . In this embodiment, since the structure of the second fixing edge 30 is the same as the structure of the first fixing edge 20 , the specific structure can be referred to the description of the structure of the first fixing edge 20 above, so it is omitted here. The structure of the second fixing edge 30 will be described.

The second folded edge 31 and the first folded edge 21 are arranged opposite to each other and extend toward each other, that is, the second folded edge 31 also extends along the width direction of the casing 10 and is opposite to the first folded edge 21 . The sides 21 are arranged facing each other. In this embodiment, since the structure of the second folded edge 31 is the same as that of the first folded edge 21 , the specific structure can refer to the structure description of the first folded edge 21 above, so it is omitted here. The structure of the second folding edge 31 will be described.

The vibration plate 40 is connected to the first folding edge 21 and the second folding edge 31 . In this embodiment, the vibration plate 40 is a square plate, and the vibration plate 40 is integrally formed with the first folded edge 21 and the second folded edge 31 , thereby reducing installation. It can be understood that, in another embodiment, the vibration plate 40 may also be bonded to the first folded edge 21 and the second folded edge 31 . Specifically, the vibration plate 40 can be adhered to the first folded edge 21 and the second folded edge 31 by using glue, double-sided tape, etc., so as to form the gap 41 with the casing 10 . Meanwhile, connecting the vibration plate 40 to the first folded edge 21 and the second folded edge 31 enables the vibration plate 40 to have enough vibration space when vibrating, thereby improving the sound quality.

Further, the material of the vibration plate 40 is the same as the material of the first fixed edge 20 and the second fixed edge 30, that is, the material of the vibration plate 40 can be made of silica gel, rubber, bakelite, ethylene glycol diformate Ester fiber (PEN), polyether ketone fiber (PEEK) and other polymer materials.

The coupling pad 50 is bonded to the vibration plate 40 and is in pressing contact with the housing 10 . In this embodiment, the coupling gasket 50 is bonded to the center of the vibration plate 40, and preferably, the coupling gasket 50 can be bonded to the vibration plate 40 through glue or double-sided tape. in the center to prevent the coupling pad 50 from being separated from the vibration plate 40, or during the vibration process of the vibration plate 40, the coupling pad 50 is displaced, resulting in an unsatisfactory vibration energy transfer effect. question. The coupling pad 50 is connected between the vibration plate 40 and the casing 10 , so that the vibration energy emitted by the casing 10 can be transmitted to the vibration plate 40 and passed through the vibration plate 40 . The vibration emits sound waves.

Further, the material of the coupling gasket 50 may be silica gel, rubber or foam, so as to transmit vibration energy and ensure the transmission effect.

The piezoelectric speaker 60 is arranged inside the casing 10 . In this embodiment, the piezoelectric speaker 60 may be a piezoelectric ceramic sheet, and the volume of the piezoelectric speaker 60 is larger than that of the coupling pad 50 , so that the piezoelectric speaker 60 can cover the coupling The contact area between the spacer 50 and the housing 10 enables the coupling spacer 50 to always be located within the vibration energy range of the piezoelectric speaker 60, so that the coupling spacer 50 can transmit the vibration energy to the on the vibrating plate 40. Preferably, the piezoelectric speaker 60 can be glued to the center of the housing 10 to prevent displacement of the piezoelectric speaker 60 .

By arranging the piezoelectric speaker 60 inside the casing 10 , then pressing the coupling gasket 50 between the casing 10 and the vibration plate 40 , and connecting the vibration plate 40 The first folded edge 21 and the second folded edge 31 allow the gap 41 to exist between the vibration plate 40 and the housing 10 , and then the piezoelectric speaker 60 can be connected to the piezoelectric speaker 60 through the coupling gasket 50 . The vibration energy is transmitted to the vibration plate 40, and the vibration energy can be converted into high-efficiency vibration sound waves through the vibration plate 40, so that the sound sensitivity of the vibration sound generating structure 100 is high, and the sound quality effect is good.

In the vibration sounding structure provided by the present invention, the two ends of the casing are covered by the first fixed edge and the second fixed edge, and the first fixed edge and the second fixed edge are provided with the first folding edge and The second folded edge, and then the vibration plate is connected to the first folded edge and the second folded edge, so that there can be a gap between the vibration plate and the shell, so as to ensure sufficient vibration space and balance the vibration, and then connect the coupling pad The sheet is placed in the gap, and then the piezoelectric speaker is attached to the area where the shell and the coupling pad are connected, and the vibration energy of the piezoelectric speaker is transmitted to the vibration plate through the coupling pad, so that the vibration plate can be forced to vibrate Generates sound waves, which in turn make sounds. By adopting the above method, the bass reproduction effect of the piezoelectric speaker can be enhanced, the sound quality is better and the sensitivity is also high.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made, and these improvements and modifications may also be regarded as It is the protection scope of the present invention.

Claims (12)

1. a kind of vibration sounding structure, which is characterized in that the vibration sounding structure includes shell, the first fixed edge, second solid Deckle, oscillating plate, coupling pad and piezoelectric speaker, first fixed edge and the second fixed edge are respectively coated by described The both ends that shell is oppositely arranged, first fixed edge include the first flanging of bending setting, and second fixed edge includes curved The second flanging of setting is rolled over, first flanging and the second flanging are oppositely arranged and mutually direction extends, and described first There is gap, the oscillating plate connects first flanging and second between flanging and second flanging and the shell Flanging, and there is gap between the oscillating plate and the shell, the coupling pad is set to the oscillating plate and the shell It is pressed between the shell and the oscillating plate in gap between body, the piezoelectric speaker is disposed in the housing Portion, the piezoelectric speaker fit in the region of the shell connecting with the coupling pad, pass through the coupling to realize Gasket is closed vibrational energy is transferred on the oscillating plate and generates the effect of sound wave.

2. vibration sounding structure according to claim 1, which is characterized in that the volume of the piezoelectric speaker is greater than described The volume of coupling pad, the piezoelectric speaker cover the contact area of the coupling pad Yu the shell.

3. vibration sounding structure according to claim 1, which is characterized in that first flanging and the second flanging are Bend the S-shaped or waveform of setting.

4. vibration sounding structure according to claim 1, which is characterized in that the oscillating plate and first flanging and Second flanging is integrally formed.

5. vibration sounding structure according to claim 1, which is characterized in that the oscillating plate and first flanging and Second flanging bonding.

6. vibration sounding structure according to claim 1, which is characterized in that the coupling pad is adhered to the oscillating plate On, and contacted with shell extruding.

7. vibration sounding structure according to claim 6, which is characterized in that the coupling pad is adhered to the oscillating plate Center.

8. vibration sounding structure described in any one according to claim 1~7, which is characterized in that the material of the coupling pad Matter is silica gel, rubber or foam.

9. vibration sounding structure according to claim 1, which is characterized in that first fixed edge and the second fixed edge It is adhered on the both ends of the shell being oppositely arranged.

10. vibration sounding structure according to claim 1, which is characterized in that first fixed edge and the second fixation While being concave shape batten.

11. vibration sounding structure according to claim 1, which is characterized in that first flanging and second folding The width direction of shell described in edge extends.

12. a kind of terminal, which is characterized in that the terminal includes terminal body and such as claim 1~11 any one institute The vibration sounding structure stated, the vibration sounding structure are electrically connected with the terminal body.