Electro-acoustic transducer with double diaphragm structure, sound generation module unit and electronic device

Abstract

This utility model relates to an electroacoustic transducer with a double-diaphragm structure, a sound-generating module unit, and electronic equipment. This application provides an electroacoustic transducer with a double-diaphragm structure, belonging to the field of electroacoustic technology. The transducer has a first diaphragm and a second diaphragm located at its upper and lower ends, and a first driving element and a second driving element physically connected to the first and second diaphragms respectively. The first and second driving elements are immersed in a static magnetic field generated by at least one magnet. A circuit is also included, configured to transmit current to the first and second driving elements. This structure can effectively reduce the size of the transducer while achieving corresponding frequency response sound quality.

Description

Technical Field

[0001] This utility model relates to an electroacoustic transducer (loudspeaker), and more particularly to the structural features of a double diaphragm. Background Technology

[0002] Electronic devices include one or more electroacoustic transducers for emitting sound. Due to the requirements of miniaturization and lightweight design, some electronic devices are configured with electroacoustic transducers that function as “miniature speakers.” These include headphones, headsets, in-ear headphones, sound-emitting module units, or other similar compact electronic devices. Utility Model Content

[0003] The main purpose of this invention is to reduce the size of the electroacoustic transducer and improve its fidelity.

[0004] According to this utility model, an electroacoustic transducer with a double-diaphragm structure is proposed. The electroacoustic transducer has a first diaphragm and a second diaphragm located at the upper and lower ends, and a first driving element and a second driving element physically connected to the first diaphragm and the second diaphragm, respectively.

[0005] Wherein, the first driving element and the second driving element are immersed in a static magnetic field, which is generated by at least one magnet; and

[0006] A circuit configured to transmit current to the first driving element and the second driving element.

[0007] Preferred,

[0008] The first driving element includes multiple conductive filament layers and a fixing substrate for fixing the conductive filament layers;

[0009] The second driving element includes multiple conductive filament layers and a fixing substrate for fixing the conductive filament layers.

[0010] Preferably, the electroacoustic transducer further includes a magnetic conductive element I, an annular magnetic conductive element II, and a circular magnetic conductive element II. The magnetic conductive element I has a groove structure, and a magnetic conductive platform is formed by extending outward from the top of the groove wall. A vent hole is formed on the magnetic conductive platform.

[0011] The annular magnetic conductive element II is sleeved on the outside of the groove of the magnetic conductive element I, and the annular magnetic conductive element II and the wall of the groove form a gap space for accommodating the first driving element.

[0012] The circular magnetic conductor II is housed in the groove of the magnetic conductor I, and the circular magnetic conductor II and the wall of the groove form a gap space for accommodating the second driving element.

[0013] The first magnet is sleeved outside the groove of the magnetic conductor I and is located between the magnetic conductor I and the annular magnetic conductor II. The second magnet is housed in the groove of the magnetic conductor I and is located between the circular magnetic conductor II and the magnetic conductor I.

[0014] Preferably, the annular magnetic conductor II is flush with the bottom of the groove, and the circular magnetic conductor II is flush with the magnetic platform.

[0015] Preferably, the materials of the magnetic conductive element I, the annular magnetic conductive element II, and the circular magnetic conductive element II are selected from one or more of iron, cobalt, nickel, and their alloys.

[0016] Preferably, the groove has a circular cross-section, and both the first driving element and the second driving element have circular cross-sections.

[0017] Preferably, the cross-section of the groove is racetrack shaped, and the cross-sections of the first driving element and the second driving element are racetrack shaped.

[0018] On the other hand, this application proposes a sound-generating module unit, which includes a housing and a support member for supporting the electroacoustic transducer. The support member and the first diaphragm define an acoustic cavity, and the support member and the second diaphragm define another acoustic cavity.

[0019] On the other hand, this application also proposes an electronic device, including the aforementioned sound-generating module unit, and further including a processor, a memory, and associated circuitry.

[0020] The present invention employs an electroacoustic transducer with a double diaphragm structure, which can effectively reduce the size of the transducer while obtaining the corresponding frequency division sound quality. Attached Figure Description

[0021] Referring to the accompanying drawings, the drawings used in the following description of the embodiments or prior art will be briefly introduced. Obviously, the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0022] Figure 1 A cross-sectional schematic diagram of an electroacoustic transducer is shown;

[0023] Figure 2 A cross-sectional schematic diagram of an electroacoustic transducer with a double diaphragm structure is shown.

[0024] Figure 3 It shows Figure 2 Cross-sectional schematic diagram of the central magnetic conductor I;

[0025] Figure 4 A schematic diagram of a frontal projection cross-section of an electroacoustic transducer with a double diaphragm structure is shown.

[0026] Figure 5 A cross-sectional schematic diagram of the sound-generating module unit of an electroacoustic transducer with a double diaphragm structure is shown.

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the described embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0030] The publicly disclosed electroacoustic transducer is constructed to improve structural stability and audio fidelity, as follows: Figure 1 The structural features shown Figure 1 A cross-sectional view of an electroacoustic transducer 10 is shown, the transducer 10 having a diaphragm 12 physically connected to a drive element 11.

[0031] The driving element 11 may include one or more winding components formed by conductive filaments (also referred to as "voice coils"). To improve the structural strength and coaxial stability of the windings, the driving element 11 is constructed as a composite structure, providing a fixed base for the windings formed by conductive filaments. One end of the driving element 11 is connected to the inner surface of the diaphragm 12, and the other end of the driving element 11 is located in the gap between the magnet 13 and / or the magnetic conductors I 14 and II 15. The magnet 13, the magnetic conductors I 14, and the magnetic conductors II 15 generate a static magnetic field. The driving element 11 is located within this static magnetic field. When a changing current (intensity and direction) flows through the coil and generates an induced magnetic field, the induced magnetic field from the coil interacts with the static magnetic field, generating a force that causes the driving element 11 and the diaphragm 12 connected to the driving element 11 to vibrate. When the changing current causes the diaphragm 12 to vibrate at an audible frequency, sound is emitted.

[0032] The electroacoustic transducer 10 has a fixing member 16 for connecting the diaphragm 12 to the magnet 13 or a magnetic conductor ( Figure 1The magnetic conductive component II 15 is fixed together. The diaphragm 12 is lightweight and flexible, and is also known as a diaphragm or paper basin. It typically has an inverse parabolic, linear, parabolic, or elliptical structure, such as... Figure 1 As shown, it has arc 121 and arc 122, wherein the radius of curvature of arc 121 is greater than the radius of curvature of arc 122.

[0033] The magnetic conductive components, including magnetic conductive component I 14 and magnetic conductive component II 15, are used to concentrate the magnetic field of magnet 13 into the gap for the movement of driving element 14, forming a uniform magnetic circuit. For example... Figure 1 The yellow and blue magnetic poles form a gap that allows the drive element 14 to move, and provide a stable static magnetic field within the gap.

[0034] See now Figure 2 , Figure 2 A cross-sectional view of an improved electroacoustic transducer is shown. The electroacoustic transducer 20 has a first diaphragm 22a and a second diaphragm 22b located at its upper and lower ends. Figure 1 The same as the electroacoustic transducer 10, Figure 2 The electroacoustic transducer 20 shown may include a first driving element 21a and a second driving element 21b, which are physically connected to the first diaphragm 22a and the second diaphragm 22b, respectively. The driving elements 21a and 21b may have voice coils immersed in a static magnetic field. Both diaphragms are fixed to the magnetic conductor via fixing members 26. Specifically, the first diaphragm 22a is fixed to the magnetic conductor I 25a via fixing member 26, and the second diaphragm 22b is fixed to the magnetic conductor I 24 via another fixing member 26. Thus, an electroacoustic transducer with a double-diaphragm structure is formed. This structure can effectively reduce the size of the transducer and obtain corresponding crossover sound quality.

[0035] The magnetic conductor I 24 is constructed with a groove structure and a "T"-shaped vertical cross-section. The horizontal cross-section of the groove can be circular, oval, racetrack, or other shapes. Correspondingly, the driving element can be circular, oval, racetrack, or other shapes. In other embodiments, when viewed from above (or below) in a plan view, the cross-sectional shape of the driving element is similar to the cross-sectional shape of the groove in the magnetic conductor I 24. For oval or racetrack-shaped structures, which have a major axis and a minor axis, this structure can increase the size of the driving element to obtain greater power handling capacity and better sound quality.

[0036] The following explanation uses the circular cross-section of the groove in the magnetic conductive component I 24 as an example. (See [link]). Figure 3The groove of the magnetic conductive component I 24 has a vertical height h, and therefore has a groove bottom 241, a groove top 242 and a groove wall 243. A magnetic conductive platform 244 is formed extending outward from the groove top 242. A vent hole 245 is constructed on the magnetic conductive platform 244 along the circumference of the groove.

[0037] Combination Figure 2 and Figure 3 The first magnet 23a is sleeved on the outside of the groove of the magnetic conductor I 24 and forms a gap space with the groove wall 243 to accommodate the first driving element 21a. Similarly, the second magnet 23b is accommodated in the groove of the magnetic conductor I 24 and forms a gap space with the groove wall 243 to accommodate the second driving element 21b.

[0038] The magnetic induction intensity of the first magnet 23a and the second magnet 23b is weakened to a certain extent. In order to reduce the intensity of the weakening, an annular magnetic guide II 25a is provided at the outer end of the first magnet 23a near the first driving element 21a. The annular magnetic guide II 25a is also sleeved on the outside of the groove of the magnetic guide I 24, and forms a gap space with the groove wall 243 to accommodate the first driving element 21a. Similarly, a circular magnetic guide II 25b is provided at the outer end of the second magnet 23b near the second driving element 21a. The circular magnetic guide II 25b is correspondingly accommodated in the groove of the magnetic guide I 24, and forms a gap space with the groove wall 243 to accommodate the second driving element 21b.

[0039] For example, the annular magnetic conductor II 25a is flush with the bottom 241 of the groove of the magnetic conductor I 24, and the circular magnetic conductor II 25b is flush with the top 242 of the groove or the magnetic platform 244 of the magnetic conductor I 24.

[0040] Magnetic conductive components, including magnetic conductive component I 24, annular magnetic conductive component II 25a, and circular magnetic conductive component II 25b, are made of materials with magnetic properties, such as iron, cobalt, nickel, and their alloys, including steel. Their purpose is to create a strong static magnetic field in the gap space, such as... Figure 4 As shown.

[0041] The first diaphragm 22a and the second diaphragm 22b form raised arcs with different radii of curvature. In some embodiments, multiple grooves, channels, conduits, holes, and other structures are formed on the surfaces of the first diaphragm 22a and the second diaphragm 22b, such as... Figure 2 As shown, a balance hole 22b1 is formed on the surface of the second diaphragm 22b to balance the air pressure inside the transducer.

[0042] See Figure 5The electroacoustic transducer 20 is positioned within an acoustic enclosure or a supporting sound-generating module unit, which can be a standalone device used independently or in combination. It can also be used in smaller, portable devices, including headphones or wearable devices.

[0043] In some embodiments, Figure 5 The sound-generating module unit includes a housing 31 that houses the electroacoustic transducer 20. The housing can be made of metal or rigid organic material to improve its structural strength and service life. Inside the housing 31, a support member 32 is provided to support the electroacoustic transducer 20 and defines the internal acoustic channel area and channel passage. Specifically, the support member 32 and the first diaphragm 22a define an acoustic cavity (as shown by the thick arrow), which outputs sound; the support member 32 and the second diaphragm 22b define an acoustic cavity (as shown by the dashed arrow). The two acoustic cavities emit sound from the top and bottom to avoid sound wave interference.

[0044] And, although not in Figures 1-4 As shown, the electroacoustic transducer 20 and / or the sound-generating module unit also includes other circuits or electrical components 41 (e.g., capacitors, inductors, frequency dividers, and / or amplifiers) to regulate and / or drive electrical signals to flow through the drive units (first drive unit and second drive unit).

[0045] An electronic device having the aforementioned electroacoustic transducer 20 or sound-emitting module unit generally includes a processor, a memory, and associated circuitry. The memory stores instructions, for example, that, when executed by the processor, cause the electroacoustic transducer 20 in the electronic device to emit sound within a selected frequency range.

[0046] For example, it also includes communication connectors for establishing communication with another signal source or processor to enable remote control.

Claims

1. An electroacoustic transducer with a double-diaphragm structure, characterized in that, The electroacoustic transducer has a first diaphragm and a second diaphragm located at its upper and lower ends, and a first driving element and a second driving element physically connected to the first diaphragm and the second diaphragm, respectively. Wherein, the first driving element and the second driving element are immersed in a static magnetic field, which is generated by at least one magnet; and A circuit configured to transmit current to the first driving element and the second driving element.

2. The electroacoustic transducer according to claim 1, characterized in that, The first driving element includes multiple conductive filament layers and a fixing substrate for fixing the conductive filament layers; The second driving element includes multiple conductive filament layers and a fixing substrate for fixing the conductive filament layers.

3. The electroacoustic transducer according to claim 1, characterized in that, The electroacoustic transducer also includes a magnetic conductive element I, an annular magnetic conductive element II, and a circular magnetic conductive element II. The magnetic conductive element I has a groove structure, and a magnetic conductive platform is formed by extending outward from the top of the groove wall. A vent hole is constructed on the magnetic conductive platform. The annular magnetic conductive element II is sleeved on the outside of the groove of the magnetic conductive element I, and the annular magnetic conductive element II and the wall of the groove form a gap space for accommodating the first driving element. The circular magnetic conductor II is housed in the groove of the magnetic conductor I, and the circular magnetic conductor II and the wall of the groove form a gap space for accommodating the second driving element. The first magnet is sleeved outside the groove of the magnetic conductor I and is located between the magnetic conductor I and the annular magnetic conductor II. The second magnet is housed in the groove of the magnetic conductor I and is located between the circular magnetic conductor II and the magnetic conductor I.

4. The electroacoustic transducer according to claim 3, characterized in that, The annular magnetic conductor II is flush with the bottom of the groove, and the circular magnetic conductor II is flush with the magnetic platform.

5. The electroacoustic transducer according to claim 3, characterized in that, The materials of the magnetic conductive component I, the annular magnetic conductive component II, and the circular magnetic conductive component II are selected from one or more of iron, cobalt, nickel, and their alloys.

6. The electroacoustic transducer according to claim 3, characterized in that, The groove has a circular cross-section, and the first driving element and the second driving element also have circular cross-sections.

7. The electroacoustic transducer according to claim 3, characterized in that, The groove has a racetrack-shaped cross-section, and the first and second driving elements also have racetrack-shaped cross-sections.

8. A sound-generating module unit, characterized in that, The sound-generating module unit includes a housing, and a support member is disposed inside the housing to support the electroacoustic transducer as described in any one of claims 1-7. The support member and the first diaphragm define an acoustic cavity, and the support member and the second diaphragm define another acoustic cavity.

9. An electronic device, characterized in that, The device includes the sound-generating module unit as described in claim 8, and further includes a processor, a memory, and associated circuitry.

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