Full-frequency electret loudspeaker

Abstract

The utility model discloses a full-frequency electret loudspeaker which comprises a support, a first magnetic circuit system and a second magnetic circuit system, the first magnetic circuit system and the second magnetic circuit system are assembled in a containing cavity of the support, the second magnetic circuit system is located above the first magnetic circuit system, the full-frequency electret loudspeaker further comprises a magnetic conduction vibrating diaphragm, the magnetic conduction vibrating diaphragm is assembled between the first magnetic circuit system and the second magnetic circuit system, and the magnetic conduction vibrating diaphragm is located above the first magnetic circuit system. The first magnetic circuit system and the second magnetic circuit system are separated; the magnetic conductive vibrating diaphragm comprises a magnetic conductive metal sheet, an elastic dangling edge arranged at the edge of the magnetic conductive metal sheet, and magnetic conductive rings arranged on the upper surface and the lower surface of the elastic dangling edge. According to the full-frequency electret loudspeaker, the elastic dangling edge made of the independently developed PTR elastic material is innovatively added, so that the whole sound production loudspeaker has high-frequency performance, and the vibration amplitude of the magnetic conducting vibrating diaphragm is increased under the action of an alternating electromagnetic field generated by the first magnetic circuit system and the second magnetic circuit system due to the elastic dangling edge made of the PTR elastic material, so that the sound production efficiency is improved. Therefore, the full-band monomer electret loudspeaker with the frequency range of 20 HZ to 40 KHZ is obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of loudspeakers, and more particularly to a full-frequency electret loudspeaker. Background Art

[0002] The speaker is an indispensable component in common headphones. Its function is to convert electrical signals into sound. It is also called a loudspeaker. There are many kinds of speakers on the market, including full-range speakers, high-frequency speakers or moving iron, extremely high frequency moving iron, ultra-high frequency electrostatic and other sound-generating units.

[0003] The magnetic diaphragm in existing electret technology uses a whole magnetic metal sheet and uses the upper and lower magnetic circuit systems to vibrate and produce sound. Currently, the magnetic diaphragm usually uses a whole piece of 0.4-0.7MM magnetic nickel metal as the sound-producing material. Because the entire sound-producing material is metal and the thickness is relatively thick, it can only produce high frequencies. The electret speakers produced by existing technology (Korea BSE) can usually only produce sound units in the high-frequency and ultra-high-frequency (6kHz-20kHz) frequency bands, without low-frequency response, and are often used in combination with full-range speakers.

[0004] What the human ear can appreciate is often the sound produced by full-band speakers. Ordinary people focus on the mid- and low-frequency sounds, and only those who absolutely like to restore music will pursue the musical details brought by ultra-high frequencies.

[0005] The purpose of the utility model is to provide a full-band electret loudspeaker, aiming to solve the technical problem that the electret loudspeaker in the prior art has only high frequencies but no intermediate or low frequencies and cannot be widely used. Utility Model Content

[0006] To achieve the above-mentioned object, the present invention adopts the following technical solution: a full-range electret speaker, comprising: a bracket, a first magnetic circuit system and a second magnetic circuit system, wherein the first magnetic circuit system and the second magnetic circuit system are assembled in a cavity of the bracket, and the second magnetic circuit system is located above the first magnetic circuit system; and further comprising: a magnetically conductive diaphragm, wherein the magnetically conductive diaphragm is assembled between the first magnetic circuit system and the second magnetic circuit system to separate the first magnetic circuit system from the second magnetic circuit system;

[0007] The magnetic conductive diaphragm comprises a magnetic conductive metal sheet, an elastic suspension edge arranged on the edge of the magnetic conductive metal sheet, and magnetic conductive rings arranged on the upper surface and the lower surface of the elastic suspension edge.

[0008] As a preferred solution of the present invention, the elastic suspension edge is arranged in a ring shape, and the magnetic conductive metal sheet is closely attached to the first area of ​​the upper surface or the lower surface of the elastic suspension edge.

[0009] As a preferred solution of the present invention, two magnetic conductive rings are provided, which are respectively assembled on the second areas of the upper surface and the lower surface of the elastic suspension; the second area is located outside the first area.

[0010] As a preferred solution of the present invention, the elastic hanging edge is arranged in a ring shape, and a slot is provided on the inner side of the elastic hanging edge toward the outer side, and the edge of the magnetic conductive metal sheet is inserted into the slot.

[0011] As a preferred solution of the present invention, the thickness of the magnetic conductive metal sheet is 0.4MM-0.7MM.

[0012] As a preferred solution of the present invention, the elastic hanging edge is integrally formed of a PTR material with a hardness of 70°-80°.

[0013] As a preferred solution of the present invention, the magnetic conductive metal sheet and the elastic suspension edge are fixed by glue and / or hot pressing.

[0014] As a preferred solution of the present invention, the first magnetic circuit system and the second magnetic circuit system both include: a magnet and a voice coil, the magnet is arranged in an annular shape, and the voice coil is assembled in the magnet;

[0015] The magnets of the first magnetic circuit system are in close contact with the magnetic ring on the lower side of the magnetic diaphragm, and the magnets of the second magnetic circuit system are in close contact with the magnetic ring on the upper side of the magnetic diaphragm; and there are gaps between the first and second magnetic circuit systems and the magnetic metal sheet.

[0016] As a preferred solution of the present invention, the first magnetic circuit system, the second magnetic circuit system and the magnetic conductive diaphragm are coaxially assembled.

[0017] As a preferred solution of the present invention, a PCB frequency dividing board is provided at the open portion of the top of the bracket, the PCB frequency dividing board is provided with tuning holes, and tuning nets are provided corresponding to the tuning holes.

[0018] It can be seen from the above technical solutions that, compared with the prior art, the present invention has the following beneficial technical effects:

[0019] 1. This full-range electret loudspeaker includes a bracket having an effective space, and a magnetically conductive diaphragm and a first magnetic circuit system and a second magnetic circuit system disposed in the effective space. The first magnetic circuit system and the second magnetic circuit system are spaced apart from each other. The magnetically conductive diaphragm is disposed between the first magnetic circuit system and the second magnetic circuit system and is spaced apart from the first magnetic circuit system and the second magnetic circuit system, respectively. The magnetically conductive diaphragm is configured to vibrate and produce sound under the action of an alternating electromagnetic field generated by the magnetic circuit system.

[0020] 2. This full-range electret speaker innovatively incorporates the elastic suspension of the independently developed PTR elastic material, which not only allows the entire speaker to have high-frequency performance, but also increases the vibration amplitude of the magnetic diaphragm under the action of the alternating electromagnetic field generated by the first and second magnetic circuit systems, thereby obtaining a 20HZ-40KHZ full-band single electret speaker.

[0021] 3. After testing, this full-range electret speaker has determined that two PTR elastic materials with hardness of 70° and 80° are used as the elastic suspension and the magnetic diaphragm is made. The 70° material has better low-frequency dive and full-band performance, while the 80° material has better three-band balance and more detailed performance.

[0022] 4. Changes in the rubber material of the elastic suspension of the magnetic diaphragm and the degree of tension of the elastic suspension will also affect the low-frequency performance of the entire speaker, mainly manifested in the elasticity, dive, speed, etc. of the low frequency, providing a more accurate tuning method for personalized product needs;

[0023] 5. During the production process of this full-range electret speaker, the magnetic diaphragm produces sound in the entire concentric and coaxial magnetic circuit, resulting in a full-band frequency response with lower distortion, a larger sound field, and more transparent high frequencies. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0025] Figure 1 Schematic diagram of the full-range electret loudspeaker of the present invention;

[0026] Figure 2 Schematic cross-section of the full-range electret loudspeaker of the present invention;

[0027] Figure 3 This is an exploded view of the full-range electret loudspeaker of the utility model;

[0028] Figure 4 Schematic diagram of the magnetically conductive diaphragm in the full-range electret loudspeaker of the present invention;

[0029] Figure 5 It is a cross-sectional schematic diagram of the magnetically conductive diaphragm in the full-range electret loudspeaker of the present invention;

[0030] Figure 6 for Figure 2 Enlarged view of point A in the middle. DETAILED DESCRIPTION

[0031] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0032] Full-range electret speakers, see Figure 1-6 As shown, it includes: a bracket 100, a first magnetic circuit system 200, a second magnetic circuit system 300 and a magnetic conductive diaphragm 400.

[0033] like Figure 1 and Figure 3 As shown, the bracket 100 has a bottom plate and side panels, so that an effective space, namely a cavity 101, is formed inside the bracket 100; a PCB frequency divider 500 is provided at the open top of the bracket 100, and the PCB frequency divider 500 is provided with tuning holes 501, and a tuning net 600 is provided corresponding to the tuning holes 501.

[0034] The first magnetic circuit system 200, the second magnetic circuit system 300 and the magnetically conductive diaphragm 400 are assembled in the cavity 101 of the bracket 100, and the second magnetic circuit system 300 is located above the first magnetic circuit system 200. The magnetically conductive diaphragm 400 is assembled between the first magnetic circuit system 200 and the second magnetic circuit system 300 to separate the first magnetic circuit system 200 and the second magnetic circuit system 300; the magnetically conductive diaphragm 400 is used to vibrate and make sound under the action of the alternating electromagnetic field generated by the first magnetic circuit system 200 and the second magnetic circuit system 300.

[0035] Furthermore, if Figure 3-5 As shown, the magnetic diaphragm 400 includes: a magnetic metal sheet 410, an elastic suspension 420 provided on the edge of the magnetic metal sheet 410, and magnetic rings 430 provided on the upper and lower surfaces of the elastic suspension 420;

[0036] In one embodiment, the elastic suspension 420 is arranged in a ring shape, the magnetic metal sheet 410 is close to the first area 421 of the upper surface or lower surface of the elastic suspension 420, and two magnetic rings 430 are provided, which are respectively assembled on the second area 422 of the upper surface and lower surface of the elastic suspension 420; the second area 422 is located on the outside of the first area 421.

[0037] Specifically, if Figure 3 As shown, the elastic hanging edge 420 is defined by dotted lines as a first area 421 and a second area 422;

[0038] like Figure 5 As shown, the magnetic conductive metal sheet 410 is closely attached to the first area 421 of the lower surface of the elastic suspension edge 420;

[0039] Optionally, the magnetic conductive metal sheet 410 may also be in close contact with the first area 421 of the lower surface of the elastic suspension edge 420 ;

[0040] Optionally, the elastic hanging edge 420 is arranged in a ring shape, and a slot is provided on the inner side of the elastic hanging edge 420 toward the outer side, and the edge of the magnetic conductive metal sheet 410 is inserted into the slot.

[0041] Furthermore, the magnetic conductive metal sheet 410 is made of nickel metal, and the thickness of the magnetic conductive metal sheet 410 is 0.4MM-0.7MM;

[0042] The elastic suspension edge 420 is made of a PTR material with a hardness of 70°-80°. The characteristics of the PTR material are:

[0043] 1.PTR material has elasticity closer to rubber, with greater internal loss, which is good for absorbing noise;

[0044] 2.PTR material has elasticity, resilience and shape retention close to rubber, and has the good molding and fitting properties of PU, making it very suitable for the edge material of sound membrane.

[0045] The structural principle of the magnetic diaphragm: the middle is a magnetic metal sheet 410 made of ultra-thin nickel metal, and the edge is an elastic suspension 420 made of an integral PTR material. The elastic suspension 420 is installed with a high-hardness magnetic ring 430. The entire diaphragm is tightened with the magnetic diaphragm as the center using a special fixture. The entire magnetic diaphragm 400 vibrates up and down significantly under the action of the variable electromagnetic field of the upper and lower magnetic circuits, achieving full-band sound performance.

[0046] In the present invention, the elastic suspension 420 made of PTR material is added, so that the vibration amplitude of the magnetic diaphragm is increased under the action of the alternating electromagnetic field generated by the upper and lower magnetic circuit systems, thereby obtaining a 20HZ-40KHZ full-band single electret loudspeaker.

[0047] The full-band performance of this magnetic diaphragm 400 is critically affected by the material properties of the elastic suspension 420 made of PTR material. The thickness and width of the elastic suspension 420 of PTR material are directly related to the full-band performance of the entire electret speaker. After a year of repeated development and testing, two types of PTR elastic materials with hardness of 70° and 80° were determined as the diaphragm material of this speaker. The 70° material has better low-frequency dive and full-band performance, while the 80° material has better three-band balance and more detailed performance.

[0048] Furthermore, the magnetic conductive metal sheet 410 and the elastic hanging edge 420 are fixed by glue and / or hot pressing.

[0049] Furthermore, the first magnetic circuit system 200 and the second magnetic circuit system 300 both include: magnets 210, 310 and voice coils 220, 320, the magnets 210, 310 are arranged in a ring shape, and the voice coils 220, 320 are assembled in the magnets 210, 310;

[0050] The magnet of the first magnetic circuit system 200 is in close contact with the magnetic ring 430 on the lower side of the magnetic diaphragm 400, and the magnet of the second magnetic circuit system 300 is in close contact with the magnetic ring 430 on the upper side of the magnetic diaphragm 400; and there is a gap 102 between the first magnetic circuit system 200, the second magnetic circuit system 300 and the magnetic metal sheet 410.

[0051] Furthermore, the first magnetic circuit system 200, the second magnetic circuit system 300 and the magnetic diaphragm 400 are coaxially assembled; during the production process, the voice coil, magnet, etc. will not directly contact the magnetic metal sheet 410, and the magnetic diaphragm 40 produces sound in the entire concentric and coaxial magnetic circuit, and the resulting full-band frequency response has lower distortion, a larger sound field, and more transparent high frequencies.

[0052] Furthermore, the PCB frequency divider 500 is electrically connected to the voice coils 220 and 320. The PCB frequency divider 500 is used to transmit electrical signals to the voice coils 220 and 320, thereby energizing the voice coils 220 and 320, and causing the first magnetic circuit system 200 and the second magnetic circuit system 300 to generate an alternating electromagnetic field.

[0053] like Figure 2 As shown, the voice coils 220 and 320 correspond to the magnetic metal sheet 410, and there is a gap between the voice coils 220 and 320 and the magnetic metal sheet 410, so that the magnetic metal sheet 410 can vibrate up and down.

[0054] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. Full-range electret speaker, including: A bracket (100), a first magnetic circuit system (200) and a second magnetic circuit system (300), wherein the first magnetic circuit system (200) and the second magnetic circuit system (300) are assembled in a cavity (101) of the bracket (100), and the second magnetic circuit system (300) is located above the first magnetic circuit system (200), and is characterized in that it further includes: a magnetically conductive diaphragm (400), wherein the magnetically conductive diaphragm (400) is assembled between the first magnetic circuit system (200) and the second magnetic circuit system (300), and separates the first magnetic circuit system (200) and the second magnetic circuit system (300); The magnetic conductive diaphragm (400) comprises: a magnetic conductive metal sheet (410), an elastic hanging edge (420) arranged on the edge of the magnetic conductive metal sheet (410), and magnetic conductive rings (430) arranged on the upper surface and the lower surface of the elastic hanging edge (420).

2. The full-range electret loudspeaker according to claim 1, characterized in that: The elastic hanging edge (420) is arranged in an annular shape, and the magnetic conductive metal sheet (410) is closely attached to the first area (421) of the upper surface or the lower surface of the elastic hanging edge (420).

3. The full-range electret loudspeaker according to claim 2, characterized in that: Two magnetic conductive rings (430) are provided, respectively assembled on the second areas (422) of the upper and lower surfaces of the elastic suspension edge (420); the second area (422) is located outside the first area (421).

4. The full-range electret loudspeaker according to claim 1, characterized in that: The elastic hanging edge (420) is arranged in an annular shape, and a slot is provided on the inner side of the elastic hanging edge (420) in an outward direction, and the edge of the magnetic conductive metal sheet (410) is inserted into the slot.

5. The full-range electret loudspeaker according to any one of claims 1 to 4, characterized in that: The thickness of the magnetic conductive metal sheet (410) is 0.4MM-0.7MM.

6. The full-range electret loudspeaker according to claim 5, characterized in that: The elastic hanging edge (420) is integrally formed of a PTR material with a hardness of 70°-80°.

7. The full-range electret loudspeaker according to claim 6, characterized in that: The magnetic conductive metal sheet (410) and the elastic hanging edge (420) are fixed by glue and / or hot pressing.

8. The full-range electret loudspeaker according to claim 1, characterized in that: The first magnetic circuit system (200) and the second magnetic circuit system (300) both comprise: a magnet and a voice coil, the magnet being arranged in a ring shape, and the voice coil being assembled in the magnet; The magnet of the first magnetic circuit system (200) is in close contact with the magnetic ring (430) on the lower side of the magnetic diaphragm (400), and the magnet of the second magnetic circuit system (300) is in close contact with the magnetic ring (430) on the upper side of the magnetic diaphragm (400); and gaps (102) are left between the first magnetic circuit system (200), the second magnetic circuit system (300) and the magnetic metal sheet (410).

9. The full-range electret loudspeaker according to claim 8, characterized in that: The first magnetic circuit system (200), the second magnetic circuit system (300) and the magnetically conductive diaphragm (400) are coaxially assembled.

10. The full-range electret loudspeaker according to claim 9, characterized in that: A PCB frequency dividing board (500) is provided at the open portion of the top of the bracket (100), the PCB frequency dividing board (500) is provided with tuning holes (501), and a tuning net (600) is provided corresponding to the tuning holes (501).

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