Midrange micro speaker

Abstract

The utility model discloses a medium high sound micro loudspeaker, including: a magnetic return structure has a lower magnetic member, a magnet and an upper magnetic member, the lower magnetic member has a bottom plate part and a enclosing wall part, and the enclosing wall part and the magnet, the upper magnetic member form a magnetic gap, the magnet circumference symmetry has the pressure relief gap of forming, and the bottom plate part is formed with the pressure relief hole that communicates the pressure relief gap and outside, and the pressure relief hole is attached with the air permeable mesh cloth, a support is sealed and is combined in the enclosing wall part of the lower magnetic member, a diaphragm, and the circumference edge is combined in the support, and a voice coil is combined in the diaphragm and is located in the magnetic gap. By this, to provide a medium high sound micro loudspeaker, and has the effect of moving part low frequency energy to medium high frequency by the internal pressure of increasing when the loudspeaker is driven.

Description

Technical Field

[0001] This utility model relates to a mid-to-high frequency miniature loudspeaker, and more particularly to a design that uses the increased internal air pressure when the loudspeaker is activated to transfer some of the low-frequency energy to the mid-to-high frequency range. Background Technology

[0002] Miniature loudspeakers are loudspeakers used in thin electronic products. Their main characteristics are ultra-thin design, with a height of less than 10mm and low output power (usually less than 2W). Their internal structure is designed to maximize the housing of the magnetic return structure, resulting in a compact internal design with little extra space. Therefore, conventional miniature loudspeakers have limited options for improving the sound quality and volume of mid-high frequencies. They can usually only achieve this by adjusting the material and weight of the diaphragm, such as increasing the rigidity of the diaphragm, choosing a diaphragm with lower density, or changing the elasticity of the diaphragm suspension. However, these conventional methods have limited effect on improving the mid-high frequency performance.

[0003] Furthermore, conventional miniature loudspeakers intentionally leave vents after the magnetic return structure and bracket are combined to balance the pressure difference generated inside and outside the loudspeaker when it is operating, so as to avoid polarization distortion when the loudspeaker vibrates at low frequencies. However, this sacrifices the performance of mid and high frequencies.

[0004] Therefore, there is an urgent need to design a mid-to-high frequency miniature loudspeaker to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this invention is to provide a mid-to-high frequency miniature loudspeaker that has the effect of transferring some of the low-frequency energy to the mid-to-high frequency range by means of the increased internal air pressure when the loudspeaker is in operation.

[0006] To achieve the above objectives, the specific technical solution of this utility model for a mid-high frequency miniature loudspeaker is as follows:

[0007] A mid-high frequency miniature loudspeaker includes: a magnetic return structure having a lower magnetic conductor, a magnet, and an upper magnetic conductor; the lower magnetic conductor has a base plate and a surrounding wall, with a magnetic gap formed between the surrounding wall, the magnet, and the upper magnetic conductor; the magnet has symmetrically formed pressure relief notches around its periphery, and the base plate has formed pressure relief holes communicating with the pressure relief notches and the outside, with a breathable mesh attached to the pressure relief holes; a bracket sealed to the surrounding wall of the lower magnetic conductor; a diaphragm with its outer periphery attached to the bracket; and a voice coil attached to the diaphragm and located within the magnetic gap.

[0008] In addition, the breathable mesh fabric has an adhesive layer, which is formed with a hollowed-out area to match the pressure relief hole; the breathable mesh fabric is made of 300-500 mesh. A sealing compound is provided at the joint between the bracket and the wall. The voice coil is a lightweight voice coil wound with copper-clad aluminum wire. The pressure relief notch is a pair of semi-circular notches. The pressure relief notch connects to the magnetic gap. At the overlap of the upper magnetic conductor and the pressure relief notch of the magnet, a pressure relief notch does not need to be provided simultaneously. Attached Figure Description

[0009] Figure 1 This is a top view of the structural appearance of this utility model;

[0010] Figure 2 This is a structural appearance drawing of the present invention viewed from below.

[0011] Figure 3 This is a cross-sectional view of the structure of this utility model;

[0012] Figure 4 This is an exploded view of the structure of this utility model;

[0013] Figure 5 This is an exploded view of the structural parts of this utility model;

[0014] Explanation of markings in the diagram:

[0015] 111: Base Plate

[0016] 112: Perimeter Wall

[0017] 113: Pressure relief hole

[0018] 12: Magnet

[0019] 121: Pressure relief gap

[0020] 13: Upper magnetic conductor

[0021] 14: Magnetic gap

[0022] 15: Breathable mesh fabric

[0023] 151: Adhesive layer

[0024] 152: Excavated Area

[0025] 20: Bracket

[0026] 21: Sealing colloid

[0027] 30: Diaphragm

[0028] 40: Voice Coil Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0031] First, please refer to Figures 1-5 As shown, this novel structure includes: a magnetic return structure 10, comprising a lower magnetic conductor 11, a magnet 12, and an upper magnetic conductor 13. The lower magnetic conductor 11 has a base plate portion 111 and a surrounding wall portion 112. A magnetic gap 14 is formed between the surrounding wall portion 112, the magnet 12, and the upper magnetic conductor 13. The magnet 12 has symmetrically formed pressure relief notches 121 around its periphery, which connect to the magnetic gap 14. The pressure relief notches 121 are a pair of semi-circular pressure relief notches (semi-circular holes can reduce damage to the magnet to avoid sacrificing magnetic force). The base plate portion 111 has formed pressure relief holes 113 connecting the pressure relief notches 121 to the outside. Furthermore, a breathable mesh 15 is attached to the pressure relief hole 113. The breathable mesh 15 has an adhesive layer 151, and the adhesive layer 151 is formed with a hollow area 152 in conjunction with the pressure relief hole 113. The breathable mesh 113 is made of 300~500 mesh. A bracket 20 is sealed to the enclosure portion 112 of the lower magnetic conductor 11. A sealing colloid 21 is provided at the joint between the bracket 20 and the enclosure portion 112. A diaphragm 30 is attached to the bracket 20 at its outer periphery. A voice coil 40 is attached to the diaphragm 30 and located in the magnetic gap 14. The voice coil 40 can be a lightweight voice coil wound with copper-clad aluminum wire.

[0032] Based on this configuration, in order to further improve the mid- and high-frequency sound quality and volume of the miniature loudspeaker, this new invention modifies the design of the support 20 by changing the internal structure of the loudspeaker without altering the volume of the magnetic return structure 10 (i.e., without sacrificing the original magnetic force), making the interior of the loudspeaker a fully sealed cavity structure. The increased internal air pressure during loudspeaker operation transfers some low-frequency energy to the mid- and high-frequency ranges, improving the mid- and high-frequency sound quality and volume. Furthermore, a pressure relief channel is provided on the magnetic return structure 10. The design of (pressure relief notch 121, pressure relief hole 113 and breathable mesh 15) properly balances the internal and external air pressure of the speaker, avoiding the pressure difference between the inside and outside of the speaker caused by the environment, which would lead to mid- and high-frequency distortion of the speaker; wherein, at the overlap of the pressure relief notch 121 of the upper magnetic guide 13 and the magnet 12, the pressure relief notch does not need to be set at the same time, thereby maintaining the integrity of the upper magnetic guide 13 and ensuring that the upper magnetic guide 13 adjacent to the magnetic gap 14 has uniform magnetic force, thus avoiding speaker distortion.

[0033] Therefore, this utility model has the following characteristics:

[0034] 1. The bracket 20 and the magnetic return structure 10 are sealed together (without an airtight structure).

[0035] This allows a sealed chamber to be formed inside the speaker. When the speaker is in operation, the internal air pressure will be greater than the external air pressure, forming an air spring to suppress the diaphragm displacement by 30°, causing the vibration energy to shift from low frequencies to mid and high frequencies, thus improving the performance of mid and high frequencies.

[0036] II. The magnetic return structure 10 is equipped with pressure relief channels (pressure relief notch 121, pressure relief hole 113, and breathable mesh 15).

[0037] 1. Since the rear acoustic chamber is directly formed inside the loudspeaker, it may cause the diaphragm 30 to bulge outward under pressure in environments with significant pressure differences, such as high altitudes, resulting in speaker distortion. Therefore, the rear acoustic chamber must have an appropriate pressure relief channel to balance the pressure difference caused by the environment. In addition, the pressure relief channel can also prevent turbulent airflow from accumulating improperly in the magnetic gap 14 after entering it. Appropriately guiding some of the airflow to the outside of the loudspeaker can prevent the voice coil 40 from operating without interference.

[0038] 2. The pressure relief channel also has the advantage of heat dissipation. Since the amplitude of the speaker is small at high frequencies, when the power is high, more waste heat is easily accumulated on the voice coil 40 under electromagnetic action, which affects the performance of the voice coil 40 and the magnet 12. Through the pressure relief channel, the waste heat can be discharged to the outside of the speaker by convection.

[0039] 3. Excessive gas leakage will sacrifice power handling and mid-high frequency performance. The amount of gas leakage is controlled by using the breathable mesh 15 at the pressure relief channel opening, and the amount of gas entering and leaving can be appropriately adjusted by controlling the mesh size of the breathable mesh 15.

[0040] III. The voice coil 40 is a lightweight voice coil wound with copper-clad aluminum wire.

[0041] Since the weight of the voice coil 40 directly affects the volume output of the speaker, especially the volume of the mid and high frequencies, when the low-frequency energy of the speaker is shifted to the mid and high frequencies, the relatively low-frequency energy is smaller, and the amplitude of the voice coil 40 becomes smaller. Therefore, the voice coil 40 does not need to use high-tensile copper alloy wire. Instead, the voice coil 40 is made of copper-clad aluminum wire (CCAW), with pure aluminum or aluminum alloy as the core and pure copper as the outer layer, in order to reduce the weight of the voice coil and further improve the performance of the mid and high frequencies.

[0042] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A mid-high micro speaker characterized in that, Including: A magnetic return structure has a lower magnetic conductor, a magnet and an upper magnetic conductor. The lower magnetic conductor has a base plate and a wall portion. A magnetic gap is formed between the wall portion, the magnet and the upper magnetic conductor. The magnet has symmetrical pressure relief notches formed around its periphery. The base plate has pressure relief holes that connect the pressure relief notches to the outside. A breathable mesh is attached to the pressure relief holes. A bracket, sealed and connected to the enclosure portion of the lower magnetic conductor; A diaphragm, with its outer periphery attached to the support; as well as A voice coil is attached to the diaphragm and located within the magnetic gap.

2. The mid-high micro speaker of claim 1, wherein, The breathable mesh fabric has an adhesive layer, which is formed with a hollowed-out area in conjunction with the pressure relief hole.

3. The mid-high audio micro speaker of claim 2, wherein, The breathable mesh fabric uses a mesh size of 300-500.

4. The mid-high audio micro speaker of claim 1, wherein, The joint between the bracket and the wall has a sealing compound.

5. The mid-high audio micro speaker of claim 1, wherein, The voice coil is a lightweight voice coil wound with copper-clad aluminum wire.

6. The mid-high audio micro speaker of claim 1, wherein, The pressure relief gap is a pair of semi-circular pressure relief gaps.

7. The mid-high audio micro speaker of claim 1, wherein, The pressure relief notch connects to the magnetic gap.

8. The mid-high audio micro speaker of claim 1, wherein, At the point where the upper magnetic conductor and the magnet overlap, the pressure relief notch does not need to be set synchronously.

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