Pop-up loudspeaker based on piezoelectric effect

Abstract

The invention belongs to the technical field of loudspeakers, and particularly relates to a piezoelectric effect-based pop-up loudspeaker, which comprises a sound cavity support with a built-in sound production inner core, the sound production inner core divides the interior of the sound cavity support into a front sound cavity and a rear sound cavity, and the bottom of the front sound cavity is provided with a plurality of sound outlet holes; the sound cavity support is arranged in the side end of the equipment shell in a sliding mode, two sliding blocks are symmetrically arranged at the rear end of the sound cavity support in a sliding mode, the rear ends of the sliding blocks are bonded to one end of the piezoelectric actuator, and the other end of the piezoelectric actuator is embedded and fixed to an electrode base of the equipment shell. The piezoelectric actuator comprises a passive layer and a piezoelectric layer which are bonded into a whole; voltage is applied to the electrode holder in the thickness direction of the piezoelectric layer, and the piezoelectric layer generates length deformation and is in a bent state under the limitation of the passive layer; the piezoelectric actuator is used for driving the sliding block to push out or tighten the sound cavity support. Therefore, the hole-free design of the equipment shell is realized, the appearance is optimized, the assembly difficulty is reduced, and the use experience of a user is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of loudspeakers, and in particular relates to a pop-up loudspeaker based on piezoelectric effect. Background Art

[0002] With the improvement of people's living standards and the development of technological capabilities, smart electronic devices represented by smartphones have gradually become necessities for daily work and life. With their popularization and in-depth use, their application scenarios have gradually expanded, and users have also put forward higher demands on such products, such as the hole-free integrated design of sound equipment and enhanced external speaker effects, which have introduced new opportunities and challenges for the design optimization of smart products and the improvement of technical capabilities.

[0003] Under the existing solution, a speaker is installed inside the sound-emitting device, and a hole is opened on the surface to emit sound to achieve an external speaker effect. This type of design with holes opened on the surface has the following defects:

[0004] 1. Affect the appearance of the product and is not conducive to appearance optimization;

[0005] 2. The sound output channel is simple, with poor waterproof and dustproof capabilities, easily clogged by dust or become ineffective due to water ingress, and many after-sales problems;

[0006] 3. The open speaker design has high requirements for the production and assembly environment and has a great impact on the yield rate, pass rate, etc.

[0007] After improvement, the design of some sound output equipment systems is as follows Figure 1 As shown in the figure, the sound core is built into the sound cavity bracket, the sound cavity is sealed and pressed and fixed on the end surface of the device shell, and a sound outlet is set at one end of the device shell. The micro speaker includes a sound core and a sound cavity bracket. The sound core divides the interior of the sound cavity bracket into a front sound cavity and a rear sound cavity, as shown in the figure. Figure 2 After receiving the electrical signal, the micro speaker pushes the air in the front cavity and radiates the sound field at the sound outlet to achieve the external sound effect. This type of side sound structure greatly improves the problems of the sound system under the existing solution that affect product appearance, after-sales complaints, and production and assembly difficulties, but there are still the following defects that affect the user experience:

[0008] 1. The sound outlet needs to be opened on the surface of the device shell, which is not conducive to the hole-free design of the sound device and affects the appearance;

[0009] 2. It is not conducive to the waterproof and dustproof design of micro speakers, and increases the difficulty of design stacking and assembly;

[0010] 3. Space for the sound channel needs to be reserved in the device housing, which affects the device layout in the length direction of the sound device and reduces the stacking space;

[0011] 4. Compared with the front sound, the side sound will affect the external sound effect, such as volume, distortion, etc., because the sound output channel is lengthened.

[0012] Based on this, the present invention designs a pop-up speaker solution based on the piezoelectric effect, which can be applied to various devices such as smart phones and tablets to enhance the user experience. Summary of the invention

[0013] The present invention provides a pop-up speaker based on piezoelectric effect, comprising a sound cavity support with a built-in sound core, the sound core divides the interior of the sound cavity support into a front sound cavity and a rear sound cavity, and the bottom of the front sound cavity is provided with a plurality of sound outlet holes; the sound cavity support is slidably placed in the edge of a device shell, and the rear end of the sound cavity support is symmetrically slidably provided with two sliders, the rear end of the slider is bonded to one end of a piezoelectric actuator, and the other end of the piezoelectric actuator is embedded in an electrode seat fixed to the device shell; the piezoelectric actuator comprises a passive layer and a piezoelectric layer bonded as one; the electrode seat applies voltage along the thickness direction of the piezoelectric layer, the piezoelectric layer produces length deformation and presents a bending state under the restriction of the passive layer; the piezoelectric actuator is used to drive the slider to push out or tighten the sound cavity support.

[0014] Furthermore, a T-shaped slide groove is provided at the rear end of the sound cavity bracket, the sliding block is embedded in the T-shaped slide groove, and the sliding block matches the T-shaped slide groove.

[0015] Furthermore, the passive layer is made of plastic.

[0016] Furthermore, the material of the piezoelectric layer is a 1-3 type piezoelectric composite material.

[0017] Furthermore, both sides of the front end of the sound cavity bracket are integrally provided with plug-shaped bosses that are slidably embedded in the device housing.

[0018] Furthermore, the sound cavity support is located at a corner of the device housing, and the outer contour surface of the sound cavity support matches the shape of the device housing.

[0019] Furthermore, the plug-shaped boss on the right side of the sound cavity bracket is close to the corner of the device housing and is symmetrically trident-shaped.

[0020] Furthermore, the plug-shaped boss on the left side of the sound cavity bracket is in a symmetrical double-fork shape.

[0021] Furthermore, the direction in which the sound cavity bracket is embedded in the device housing is parallel to the length direction of the device housing.

[0022] Furthermore, two symmetrical spring dampers are fixedly provided at the rear end of the sound cavity bracket, one end of the spring damper is in contact with the device housing; the two spring dampers are located between the two sliders; the spring damper is used to stably pop out the sound cavity bracket.

[0023] The beneficial effects brought by the present invention are as follows:

[0024] 1. The outer surface of the sound device can be made hole-free, which is conducive to waterproof and dustproof design and saves stacking space;

[0025] 2. Improve the external sound effect by using the speaker to emit positive sound and expand the back cavity;

[0026] 3. Using piezoelectric actuators to provide driving force can simplify the design and improve system reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram showing the sound output structure of a traditional micro speaker.

[0028] Figure 2 Schematic diagram showing the sound cavity layout of a traditional micro speaker.

[0029] Figure 3 A schematic diagram of the structure of a pop-up speaker based on piezoelectric effect provided by the present invention is shown.

[0030] Figure 4 express Figure 3 Schematic diagram of the explosion structure.

[0031] Figure 5 express Figure 3 Schematic diagram of the external structure of the midrange cavity bracket.

[0032] Figure 6 Indicates the device housing and Figure 5 Schematic diagram of the sliding groove matching the plug-shaped boss in the middle.

[0033] Figure 7 A diagram showing the present invention being retracted into the device housing.

[0034] Figure 8 express Figure 7 AA cross-section diagram of .

[0035] Fig. 9 express Figure 3 Schematic diagram of the structural principle of the medium-pressure electric actuator.

[0036] Fig.10 A state diagram showing the housing of an ejection device of the present invention.

[0037] Fig.11 express Fig.10 Position diagram of the sound hole on the midrange cavity bracket.

[0038] In the figure, 1 is a sound cavity bracket; 2 is a slider; 3 is a piezoelectric actuator; 4 is an electrode holder; 5 is a spring damper; 11 is a sound core; 12 is a front sound cavity; 13 is a rear sound cavity; 14 is a sound outlet; 15 is a plug-shaped boss; 31 is a passive layer; and 32 is a piezoelectric layer. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Example

[0041] like Figures 3 to 11 As shown, the present invention provides a pop-up speaker based on piezoelectric effect, hereinafter referred to as the speaker, comprising a sound cavity bracket 1 with a built-in sound core 11, the sound core 11 divides the interior of the sound cavity bracket 1 into a front sound cavity 12 and a rear sound cavity 13, and a plurality of sound outlet holes 14 are arranged at the bottom of the front sound cavity 12; the sound cavity bracket 1 is slidably placed in the edge of the device housing, and the rear end of the sound cavity bracket 1 is symmetrically slidably provided with two sliders 2, the rear end of the slider 2 is bonded to one end of a piezoelectric actuator 3, and the other end of the piezoelectric actuator 3 is embedded in an electrode holder 4 fixed to the device housing; as shown Fig. 9 As shown, the piezoelectric actuator 3 includes a passive layer 31 and a piezoelectric layer 32 bonded together; the electrode seat 4 applies voltage along the thickness direction of the piezoelectric layer 32, and the piezoelectric layer 32 produces length deformation and presents a bending state under the restriction of the passive layer 31; the piezoelectric actuator 3 is used to drive the slider 2 to push out or tighten the sound cavity bracket 1.

[0042] Specifically, a T-shaped groove is provided at the rear end of the sound cavity bracket 1, and the slider 2 is embedded in the T-shaped groove. The slider 2 matches the T-shaped groove so that the slider 2 can drive the sound cavity bracket 1 to move. That is, when the piezoelectric actuator 3 produces positive and reverse bending, the slider 2 will move in the T-shaped groove to transmit the driving force.

[0043] After receiving the alternating electrical signal, the sound core 11 can drive the diaphragm on it to vibrate, push the air in the front sound cavity 12, and radiate the sound field at the sound outlet 14. The sound core 11 is generally bonded to the corresponding overlapping bosses in the sound cavity bracket 1 by glue; and the rear sound cavity 13 is the cavity surrounded by the non-diaphragm surface of the sound core 11 and the sound cavity bracket 1. Generally, the larger the rear sound cavity 13, the better the acoustic effect of the speaker. The details will not be repeated. At the same time, a number of sound outlet holes 14 are set at the bottom of the front sound cavity 12 to enable the speaker to emit sound and expand the rear sound cavity 13, thereby improving the external sound effect and enhancing the user experience.

[0044] The passive layer 31 is a soft material without electrodes, such as plastic PC, PP, etc.; the piezoelectric layer 32 is made of existing piezoelectric materials, that is, a type of functional material with piezoelectric effect. The piezoelectric effect refers to the effect that a material generates an electrical signal under pressure; or the phenomenon that a material undergoes mechanical deformation under the action of an electric field, which will not be described in detail. The passive layer 21 and the piezoelectric material layer 22 can be bonded by glue to form a piezoelectric actuator 3. The material of the piezoelectric layer 32 is preferably a 1-3 type piezoelectric composite material.

[0045] One end of the piezoelectric actuator 3 is preferably fixed in the electrode holder 4 by glue. When voltage is applied to both ends of the piezoelectric actuator 3 in the thickness direction through the electrode holder 4, deformation can be generated and actuating force can be provided due to the inverse piezoelectric effect.

[0046] As an embodiment of the present invention, both sides of the front end of the sound cavity bracket 1 are integrally provided with plug-shaped bosses 15 slidably embedded in the device housing to ensure the stability of the movement of the sound cavity bracket 1.

[0047] When in use, the sound cavity bracket 1 can be set at a corner of the device housing, and the outer contour surface of the sound cavity bracket 1 matches the shape of the device housing, thereby improving the overall appearance and enhancing the user experience.

[0048] Specifically, Figure 4 and Figure 5 As shown, the plug-shaped boss 15 on the right side of the sound cavity bracket 1 is close to the corner of the device housing and is symmetrically trident-shaped; the plug-shaped boss 15 on the left side of the sound cavity bracket 1 is symmetrically bifurcated; accordingly, as Figure 6 As shown, the device housing is provided with a matching sliding groove, which will not be described in detail. This further improves the installation position accuracy of the sound cavity bracket 1 and ensures that the piezoelectric actuator 3 stably drives the sound cavity bracket 1 to move linearly. The sound cavity bracket 1 is embedded as a whole, and the plug-shaped boss 15 is designed to cooperate with the device housing, such as Figure 4 As shown, when the speaker is not in use, the outer surface of the device housing is free of holes.

[0049] In the usage scenario, the direction in which the sound cavity bracket 1 is embedded in the device casing is parallel to the length direction of the device casing, that is, the sound cavity bracket 1 is embedded in the device casing from the wide side end of the device casing.

[0050] As an embodiment of the present invention, two symmetrical spring dampers 5 are fixedly provided at the rear end of the sound cavity bracket 1, and one end of the spring damper 5 is abutted against the device housing; the two spring dampers 5 are located between the two sliders 2; the spring damper 5 can further ensure the stable pop-up action of the sound cavity bracket 1, ensure a smooth pop-up process, and assist in the overall recovery of the speaker.

[0051] The spring damper 5 here is a compression spring, and one end of the spring damper 5 is bonded and fixed on the sound cavity bracket 1, which will not be described in detail.

[0052] Working principle of the present invention:

[0053] During use, the piezoelectric actuator 3 will continue to receive the gradually increasing electrical signal and deform, the slider 2 will slide to generate a positive driving force, and with the help of the spring damper 5, the sound cavity bracket 1 will pop out. Fig.10 and Fig.11 As shown, the piezoelectric actuator 3 is used to support the sound cavity bracket 1 to achieve positioning and expose the sound outlet 14. At the same time, the sound-emitting core 11 receives the audio electrical signal, pushes the air in the front sound cavity 12, and radiates the sound field to achieve the external sound effect. Since there is no need to design the sound outlet channel of the front sound cavity 12 at the edge of the device casing, the internal stacking space of the whole machine can be saved for the expansion of the rear sound cavity 13. At the same time, the speaker sound output scheme is a positive sound output, which will be beneficial to improve the acoustic performance of the speaker. After use, the piezoelectric actuator 3 receives the gradually attenuated electrical signal, and the slider 2 slides to generate a reverse driving force, assisted by the action of the spring damper 5, to smoothly recover the sound cavity bracket 1. Figure 7 As shown, the sound receiving cavity bracket 1 is received inside the device housing.

[0054] The structure of the present invention can be used to eject and store the speaker of the sound-emitting device, realize a hole-free design on the surface of the sound-emitting device, improve the speaker performance, and optimize the stacking space. The present invention can also be applied to sound-emitting devices such as multifunctional cabinets.

[0055] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A pop-up speaker based on piezoelectric effect, comprising a sound cavity support (1) with a built-in sound core (11), wherein the sound core (11) divides the interior of the sound cavity support (1) into a front sound cavity (12) and a rear sound cavity (13), characterized in that: The bottom of the front sound cavity (12) is provided with a plurality of sound outlet holes (14); the sound cavity support (1) is slidably placed in the edge of the device housing, and the rear end of the sound cavity support (1) is symmetrically slidably provided with two sliders (2), the rear end of the slider (2) is bonded to one end of the piezoelectric actuator (3), and the other end of the piezoelectric actuator (3) is embedded in the electrode seat (4) fixed on the device housing; the piezoelectric actuator (3) includes a passive layer (31) and a piezoelectric layer (32) bonded together; the electrode seat (4) applies voltage along the thickness direction of the piezoelectric layer (32), and the piezoelectric layer (32) produces length deformation and presents a bending state under the restriction of the passive layer (31); the piezoelectric actuator (3) is used to drive the slider (2) to push out or tighten the sound cavity support (1).

2. The pop-up speaker based on piezoelectric effect according to claim 1, characterized in that: A T-shaped slide groove is provided at the rear end of the sound cavity support (1), and the sliding block (2) is embedded in the T-shaped slide groove, and the sliding block (2) matches the T-shaped slide groove.

3. The pop-up speaker based on piezoelectric effect according to claim 2, characterized in that: The passive layer (31) is made of plastic.

4. The pop-up speaker based on piezoelectric effect according to claim 3, characterized in that: The material of the piezoelectric layer (32) is a 1-3 type piezoelectric composite material.

5. The pop-up speaker based on piezoelectric effect according to any one of claims 1 to 4, characterized in that: Both sides of the front end of the sound cavity support (1) are integrally provided with plug-shaped bosses (15) which are slidably embedded in the device housing.

6. The pop-up speaker based on piezoelectric effect according to claim 5, characterized in that: The sound cavity support (1) is located at a corner of the device housing, and the outer contour curved surface of the sound cavity support (1) matches the shape of the device housing.

7. The pop-up speaker based on piezoelectric effect according to claim 6, characterized in that: The plug-shaped boss (15) on the right side of the sound cavity bracket (1) is close to the corner of the device housing and is in a symmetrical trident shape.

8. The pop-up speaker based on piezoelectric effect according to claim 7, characterized in that: The plug-shaped boss (15) on the left side of the sound cavity support (1) is in a symmetrical double-fork shape.

9. The pop-up speaker based on piezoelectric effect according to claim 8, characterized in that: The direction in which the sound cavity bracket (1) is embedded in the device housing is parallel to the length direction of the device housing.

10. The pop-up speaker based on piezoelectric effect according to claim 9, characterized in that: Two symmetrical spring dampers (5) are fixedly arranged at the rear end of the sound cavity bracket (1), and one end of the spring damper (5) is in contact with the device housing; the two spring dampers (5) are located between the two sliders (2); and the spring dampers (5) are used to stably pop out the sound cavity bracket (1).

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