High pitch loudspeaker

Abstract

The utility model discloses a high pitch loudspeaker. The high pitch loudspeaker comprises a support and a vibrating diaphragm, the vibrating diaphragm comprises a globe-roof film and an elastic edge surrounding the globe-roof film, the globe-roof film is composed of a diamond film, the middle of the diamond film arches upwards, and the diamond film is hung on the support through the elastic edge. The sensitivity of the high-pitch loudspeaker is further improved, the bandwidth is wide, the distortion is further reduced, and the sound quality is good.

Description

Technical Field

[0001] This utility model relates to a tweeter, and more particularly to a vehicle-mounted tweeter. Background Technology

[0002] The tweeter is a crucial component of an in-vehicle audio system, responsible for reproducing high-frequency sound. The diaphragm plays a vital role in the tweeter's sound performance. Traditional diaphragms include metal diaphragms (such as aluminum, beryllium, and lithium-magnesium alloy diaphragms) and ceramic diaphragms. However, with increasingly demanding requirements for tweeter sensitivity and distortion, traditional diaphragms are no longer sufficient for design needs. There is a need to find a new tweeter diaphragm that can further improve tweeter sensitivity, further reduce distortion, and achieve better sound quality.

[0003] The information disclosed in the background section is only intended to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0004] This invention provides a tweeter with improved sensitivity, wider bandwidth, lower distortion, and better sound quality.

[0005] The first aspect of this utility model provides a tweeter, including a bracket and a diaphragm, the diaphragm including a dome diaphragm and an elastic edge surrounding the dome diaphragm, the dome diaphragm being composed of a diamond film arched upward in the middle, the diamond film being suspended on the bracket by the elastic edge.

[0006] In a preferred embodiment, the dome diaphragm is arc-shaped in a cross-section along the vibration axis of the tweeter.

[0007] In a more preferred embodiment, the diamond film is hemispherical in shape.

[0008] In a preferred embodiment, the diamond film is a thin film with a thickness of 0.01 to 0.25 mm formed by carbon atom deposition. More preferably, the thickness of the diamond film is 0.02 to 0.15 mm, and even more preferably, 0.035 to 0.08 mm.

[0009] In a preferred embodiment, the dome film is a single-layer diamond film with a thickness of 0.035–0.08 mm.

[0010] In a preferred embodiment, the elastic edge includes an annular arched portion and a suspended edge, the suspended edge being fixed to the bracket, the arched portion having an outer edge, an inner edge, and a central portion located between the outer edge and the inner edge and arching upwards, the outer edge of the arched portion being connected to the suspended edge, and the inner edge of the arched portion being connected to the dome membrane.

[0011] In a more preferred embodiment, the shape of the arch is arc-shaped in a cross-section along the vibration axis of the tweeter.

[0012] In a further preferred embodiment, a voice coil is connected to the outer edge of the dome diaphragm or the inner edge of the arch, the voice coil extending downward from the diaphragm and inserted into the magnetic gap of the magnetic circuit.

[0013] In a further preferred embodiment, the bracket has a cylindrical portion surrounding the periphery of the magnetic circuit and a connecting flange connected to the top end of the cylindrical portion. The magnetic circuit is disposed in the cylindrical portion and fixed to the connecting flange. The suspension edge is fixed to the upper surface of the connecting flange. A threading groove for the lead wire of the voice coil to pass through is provided on the upper surface of the connecting flange.

[0014] In a further preferred embodiment, the tweeter includes a soundproof cover, the outer edge of which is connected to the bracket and covers the outside of the diaphragm. The soundproof cover includes a plurality of intersecting connecting strips that enclose a plurality of sound-permeable holes for airflow.

[0015] The present invention adopts the above solution and has the following advantages compared with the prior art:

[0016] The tweeter of this invention uses a diaphragm with a dome diaphragm. The dome diaphragm is a pure diamond diaphragm. This diaphragm has high hardness, high thermal conductivity, high sound velocity and good insulation, which makes the tweeter more sensitive, wider bandwidth, lower distortion and better sound quality. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an exploded view of a tweeter according to an embodiment of the present invention.

[0019] Figure 2 This is a structural diagram of a basin stand according to an embodiment of the present utility model.

[0020] Figure 3 This is a top view of a tweeter according to an embodiment of the present invention.

[0021] Figure 4 for Figure 3 Sectional view along the AA direction.

[0022] Figure 5 This is a cross-sectional view of a diaphragm according to an embodiment of the present invention.

[0023] Figure 6 This is a cross-sectional view of the diaphragm for comparison.

[0024] Figure 7 The image shows the XRF plot of the diaphragm as a comparison.

[0025] Figure 8 The image shows the XRF analysis results of the diaphragm as a comparison.

[0026] Figure 9 The frequency response curves of the tweeters in the embodiments and comparative examples are shown.

[0027] Figure 10 The distortion curves of the tweeters in the embodiments and comparative examples are shown.

[0028] In the above attached figures,

[0029] 1. Support; 11. Body; 12. Connecting flange; 121. Wire groove; 2. Diaphragm; 21. Dome diaphragm; 22. Elastic edge; 221. Arched part; 222. Suspension edge; 3. Voice coil; 4. Magnetic circuit; 40. Magnetic gap; 41. U-shaped iron; 42. Magnet; 43. Front plate; 5. Resonator cover; 51. Connecting strip; 52. Sound transmission hole;

[0030] 2', Diaphragm; 21', Dome film; 211', Aluminum substrate; 212', Oxide layer; 213', Carbon layer. Detailed Implementation

[0031] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] In this article, "inner" and "outer" are defined with reference to the speaker, with the position closer to the speaker considered "inner" and vice versa. The directional terms "upper," "lower," and "horizontal" are intended to help those skilled in the art understand the structure of the tweeter and are not used to limit the state of the tweeter after it is installed in the usage scenario. For example, a tweeter can be installed on a horizontal, inclined, or vertical surface of a vehicle.

[0033] Figures 1 to 5 The diagrams are drawn to scale. To keep the instructions concise, the proportions of each component are not listed individually. However, the proportions and positions of each component should be considered part of the contents of this instruction manual.

[0034] Example

[0035] Reference Figures 1 to 5 As shown, this embodiment provides a tweeter, specifically a vehicle-mounted tweeter, for installation inside a vehicle to radiate high-frequency sound into the passenger compartment, with a frequency range of 2–20 kHz. The tweeter includes a bracket 1, a diaphragm 2, a voice coil 3, a magnetic circuit 4, and a sound enclosure 5. The bracket 1 and the sound enclosure 5 together constitute the tweeter's outer shell or frame, providing sufficient strength to support and protect internal components such as the diaphragm 2, voice coil 3, and magnetic circuit 4. The bracket 1 and sound enclosure 5 are integrally molded from plastic, for example, the sound enclosure 5 is injection molded from PC (polycarbonate). The diaphragm 2 and magnetic circuit 4 are fixedly mounted on the bracket 1. The voice coil 3 is connected to the diaphragm 2, and one end of the voice coil 3 is movably inserted into the magnetic gap 40 of the magnetic circuit 4 along its centerline. When the voice coil 3 is energized and receives an audio source signal, it vibrates reciprocally along its centerline (i.e., the speaker's vibration axis) under the drive of the magnetic field of the magnetic circuit 4, thereby causing the diaphragm 2 to vibrate reciprocally and produce sound. The center line of the voice coil 3 extends vertically, and this center line is also the vibration axis of the diaphragm 2 and other vibration systems. A closed air gap cavity is formed between the support 1, the diaphragm 2, and the magnetic circuit 4. Ideally, this air gap cavity is not connected to the outside atmosphere.

[0036] Combination Figure 1 , Figure 4 and Figure 5 As shown, the diaphragm 2 includes a dome diaphragm 21 and an elastic edge 22 surrounding the dome diaphragm 21. The dome diaphragm 21 is composed of a diamond film that arches upward from the center, and the diamond film is suspended from the bracket 1 by the elastic edge 22. In a cross-section along the vibration axis of the tweeter (e.g., Figure 4In the cross-section shown, the dome film 21 has an arc shape. Further, the diamond film can be hemispherical. The diamond film is a thin film with a thickness of 0.01–0.25 mm, preferably 0.035–0.08 mm, formed by carbon atom deposition. Specifically, in this embodiment, the dome film 21 is a single-layer diamond film with a thickness of 0.05 ± 0.005 mm. The diamond film is a thin film formed by carbon atom deposition. The dome film is formed by depositing hydrogen and methane onto the spherical surface of a blank in a vacuum chamber using plasma-enhanced chemical vapor deposition. How to obtain the diamond film is not the focus of this invention; diamond films prepared by known plasma-enhanced chemical vapor deposition or other CVD methods can be used. This diaphragm 2 has advantages such as high hardness, high thermal conductivity, high sound velocity, and good insulation.

[0037] The elastic edge 22 is a resilient rubber component, and is heat-pressed to fix its shape after being bonded to the dome diaphragm 21. The elastic edge 22 includes an annular arched portion 221 and a suspension edge 222, the suspension edge 222 being fixed to the bracket 1. The arched portion 221 has an outer edge, an inner edge, and a central portion located between the outer edge and the inner edge, the central portion extending upward from the outer edge and the inner edge. The outer edge of the arched portion 221 and the suspension edge 222 are connected and integrally formed. The inner edge of the arched portion 221 is connected to the dome diaphragm 21, specifically by adhesive bonding. In a cross-section along the vibration axis of the tweeter, the shape of the arched portion 221 is arc-shaped.

[0038] A voice coil 3 is connected to the outer edge of the dome diaphragm 21 or the inner edge of the arch 221. The voice coil 3 extends downward from the diaphragm 2 and is inserted into the magnetic gap 40 of the magnetic circuit 4. Specifically, in this embodiment, the upper end of the voice coil 3 is bonded to the outer edge of the dome diaphragm 21.

[0039] like Figure 2 As shown, the bracket 1 has a cylindrical portion 11 surrounding the magnetic circuit 4 and a connecting flange 12 connected to the top of the cylindrical portion 11. The magnetic circuit 4 is disposed in the cylindrical portion 11, and the upper end of the magnetic circuit 4 is fixed to the connecting flange 12. The suspension edge 222 is fixed to the upper surface of the connecting flange 12. A wire groove 121 for the lead wire of the voice coil 3 to pass through is provided on the upper surface of the connecting flange 12. Specifically, the magnetic circuit 4 includes a U-shaped iron 41, a magnet 42, and a front plate 43. The magnet 42 and the front plate 43 are disposed in the U-shaped iron 41, and a magnetic gap 40 is formed between the outer surfaces of the U-shaped iron 41 and the magnet 42 / front plate 43. The dome diaphragm 21 is disposed entirely on the front plate 43, and the elastic edge 22 is located directly above the connecting flange 12. The U-shaped iron 41 has an upward-facing opening, and the upper surface of the U-shaped iron 41 surrounding the opening is fixed to the lower surface of the connecting flange 12, for example, by adhesive.

[0040] like Figure 3As shown, the outer edge of the speaker enclosure 5 is connected to the bracket 1 and covers the outside of the diaphragm 2. The speaker enclosure 5 includes multiple intersecting connecting strips 51, which enclose multiple sound-permeable holes 52 for airflow to allow airflow so that the diaphragm 2 can radiate sound outward.

[0041] Comparative Example

[0042] A comparative example provides a tweeter, differing from the tweeter in the embodiment only in the structure of the diaphragm 2', specifically the structure of a dome diaphragm 21'. The structure of the elastic edge and its connection method with the dome diaphragm are the same as in Embodiment 1. Figure 6 As shown, the dome film 21' includes an aluminum substrate 211', an oxide layer 212' (specifically, an aluminum oxide layer formed after oxidation of the aluminum substrate 211') on the surface of the aluminum substrate 211', and a carbon layer 213' on the oxide layer 212'. The total thickness of the dome film 21' is comparable to that of Example 1. Figure 7 and Figure 8 As shown, the overall carbon content of the diaphragm 2' is approximately 80%.

[0043] Performance Comparison

[0044] Sound effects tests were conducted on the tweeters of both the embodiment and the comparative example, with the same specifications and test conditions. Figure 9 The frequency response curves of the two tweeters are shown. It can be seen that compared with the comparative example, the tweeter of the embodiment has a wider high-frequency output extension (higher sound pressure in the 22K-40KHz frequency range; less harmonic distortion; and more transparent and better sound reproduction). Figure 10 The distortion curves of two tweeters are shown. It can be seen that, compared with the comparative example, the tweeter of the embodiment has lower high-frequency distortion in the 2K-4K frequency range.

[0045] The tweeter in this embodiment uses a diaphragm 2 with a dome diaphragm 21. The dome diaphragm 21 is a pure diamond diaphragm. The diaphragm 2 has high hardness, high thermal conductivity, high sound velocity, large elastic modulus and good insulation, which makes the tweeter more sensitive, wider bandwidth, lower distortion and better sound quality. The tweeter has a stable frequency response curve, low distortion, good sound quality, good off-axis response and wide directivity.

[0046] As indicated in this specification and claims, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0047] It can be further understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar.

[0048] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0049] The above embodiments are only for illustrating the technical concept and features of this utility model, and are preferred embodiments. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly, and they cannot be used to limit the protection scope of this utility model.

Claims

1. A tweeter, comprising a support and a diaphragm, characterized in that, The diaphragm includes a dome membrane and an elastic edge surrounding the dome membrane. The dome membrane is composed of a diamond film that arches upward from the center, and the diamond film is suspended from the support by the elastic edge.

2. The tweeter according to claim 1, characterized in that, In a cross-section along the vibration axis of the tweeter, the dome diaphragm has an arc shape.

3. The tweeter according to claim 2, characterized in that, The diamond film is hemispherical in shape.

4. The tweeter according to claim 1, characterized in that, The diamond film is a thin film with a thickness of 0.01 to 0.25 mm formed by carbon atom deposition.

5. The tweeter according to claim 1, characterized in that, The dome film is a single-layer diamond film with a thickness of 0.035–0.08 mm.

6. The tweeter according to any one of claims 1 to 5, characterized in that, The elastic edge includes an annular arched portion and a suspended edge, the suspended edge being fixed to the bracket. The arched portion has an outer edge, an inner edge, and a central portion that arches upward between the outer edge and the inner edge. The outer edge of the arched portion is connected to the suspended edge, and the inner edge of the arched portion is connected to the dome membrane.

7. The tweeter according to claim 6, characterized in that, In a cross-section along the vibration axis of the tweeter, the shape of the arch is arc-shaped.

8. The tweeter according to claim 7, characterized in that, A voice coil is connected to the outer edge of the dome diaphragm or the inner edge of the arched portion, and the voice coil extends downward from the diaphragm and is inserted into the magnetic gap of the magnetic circuit.

9. The tweeter according to claim 8, characterized in that, The bracket has a cylindrical part surrounding the periphery of the magnetic circuit and a connecting flange connected to the top of the cylindrical part. The magnetic circuit is disposed in the cylindrical part and fixed to the connecting flange. The suspension edge is fixed to the upper surface of the connecting flange. A wire groove is provided on the upper surface of the connecting flange for the lead wire of the voice coil to pass through.

10. The tweeter according to claim 9, characterized in that, The tweeter includes a soundproof cover, the outer edge of which is connected to the bracket and covers the outside of the diaphragm. The soundproof cover includes multiple intersecting connecting strips, which enclose multiple sound-permeable holes for airflow.

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