Coaxial loudspeaker

Abstract

The invention provides a coaxial loudspeaker, which comprises a first driver unit and a second driver unit, and the first driver unit and the second driver unit respectively emit sound from the same axis. The first driver unit includes a tapered diaphragm and is configured to mainly output sound in a first frequency range. The second driver unit is configured to mainly output sound of a second frequency range higher than the first frequency range, and at least one moving waveguide and / or fixed waveguide.

Description

Technical Field

[0001] The invention relates to a coaxial loudspeaker. Background Art

[0002] Coaxial speakers, which have a high-frequency driver (tweeter) and a low / mid-frequency driver (woofer) mounted on the same axis, have the advantage of reproducing a wide frequency range in a compact form.

[0003] Waveguides are often used in such loudspeakers that contain a compression driver as a high-frequency driver to guide the high-frequency sound pressure waves in a specific pattern and improve the impedance match between the pressure at the compression driver diaphragm and the outdoor air. A typical waveguide consists of an axisymmetric continuous flare, or of the same flare with two different flare shapes arranged opposite to each other, making the waveguide symmetrical in two dimensions. Typically, these waveguides are designed to achieve a specific directivity pattern in the vertical and horizontal planes, which is related to the axial direction of the loudspeaker.

[0004] Conventional waveguides typically have two symmetries, in the horizontal and vertical planes, which limits the ability to achieve different directivity patterns at the bottom of the coaxial speaker's horizontal axis compared to the top of the coaxial speaker's horizontal axis when the coaxial speaker is raised. Therefore, conventional designs are unable to provide a variety of directivity patterns related to the height position of the speaker.

[0005] Furthermore, existing coaxial speakers with moving waveguides (designed to move in sync with the cone diaphragm of a woofer) may be prone to generating unwanted noise due to the movement of the waveguide. Summary of the invention

[0006] The present invention addresses at least one of these disadvantages.

[0007] Having achieved the above objects, the present invention is defined by the appended claims.

[0008] The coaxial loudspeaker according to the disclosure and the example of the present invention comprises: a first driver unit and a second driver unit, the first driver unit and the second driver unit radiate sound individually and independently from the same axis, the first driver unit comprises a conical diaphragm and is configured to mainly output sound within a first frequency range. The second driver unit is configured to mainly output sound within a second frequency range higher than the first frequency range, the second driver unit comprises: a fixed waveguide configured to guide the sound within the second frequency range radiated by the second driver unit. The fixed waveguide has a mouth located at the outer edge of the fixed waveguide, a throat located at the end, and at least three flared surfaces, the at least three flared surfaces include a first flared surface, a second flared surface and a third flared surface, the at least three flared surfaces extend individually from the throat to the mouth of the fixed waveguide, and the at least three flared surfaces have shapes different from each other.

[0009] A coaxial speaker according to a preferred example of the present disclosure and the present invention includes: a first driver unit and a second driver unit, wherein the first driver unit and the second driver unit radiate sound independently from the same axis.

[0010] The first driver unit includes a cone diaphragm and a voice coil, and is configured to mainly output sound within a first frequency range, the second driver unit is configured to mainly output sound within a second frequency range higher than the first frequency range, the second driver unit includes: a moving waveguide configured to guide the sound within the second frequency range radiated by the second driver unit, the moving waveguide being attached to a main surface of the cone diaphragm or integrated with the main surface so as to move synchronously with the cone diaphragm; a pipe element configured to guide the sound from the second driver unit to the moving waveguide; and a radial gap formed between the pipe element and the voice coil,

[0011] The movable waveguide has an extension portion which is located in the radial gap and can move along the axis in the radial gap.

[0012] In one aspect of the present invention, a coaxial loudspeaker can achieve different directivity patterns at different positions of the horizontal axis when the coaxial loudspeaker is raised, which improves directivity control and overall acoustic performance.

[0013] In another aspect of the present invention, a coaxial speaker can reduce noise associated with a moving waveguide.

[0014] Further advantages of examples of the present invention are described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is described by way of example only and only to aid understanding of the present invention with reference to the accompanying drawings, in which:

[0016] Figure 1 is a cross-sectional view along the axis of the coaxial speaker according to Embodiment 1 of the present invention;

[0017] Figure 1A shows a fixed waveguide having flared surfaces of mutually different shapes;

[0018] Figure 2 This is a variation example of Embodiment 1 of the present invention;

[0019] Figure 3 is another variation example according to embodiment 1 of the present invention;

[0020] Figure 4 is another variation example according to embodiment 1 of the present invention;

[0021] Figure 5 is a cross-sectional view of a coaxial loudspeaker with a fixed waveguide having a flared horn structure according to Embodiment 2 of the present invention;

[0022] Figure 5A is a top view of the fixed waveguide;

[0023] Figure 5B This is a variation example of Embodiment 2 of the present invention;

[0024] Figure 6 is a cross-sectional view of a coaxial loudspeaker according to Embodiment 3 of the present invention;

[0025] Fig. 6A is a variation example of Embodiment 3 of the present invention; and

[0026] Figure 6B This is another variation example of Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0027] Example 1

[0028] In more detail, Figure 1 and Figure 1A A coaxial speaker 100 is shown, which includes a first drive unit and a second drive unit each radiating sound from the same Z-axis.

[0029] The first driver unit includes a cone diaphragm 40 and is configured to primarily output sound within a first frequency range. The first driver unit may also be referred to as a low frequency driver or a woofer. The first driver unit may cover a range from 40 Hz to 2000 Hz.

[0030] The second driver unit is configured to mainly output sound in a second frequency range higher than the first frequency range. The second driver unit may cover a range of 0.5kHz to 20kHz, preferably a range of 1kHz to 20kHz, and more preferably a range of 2kHz to 20kHz.

[0031] The first driver unit may include a magnet 60 and a voice coil 70. The voice coil 70 is connected to the cone diaphragm 40, preferably attached to the radial inner end of the cone diaphragm 40. The voice coil 70 may be made of a copper wire or an aluminum wire wound on a cylindrical coil former. When an electrical audio signal flows through the voice coil 70, it interacts with the permanent magnet 60 to generate a magnetic field, causing the cone diaphragm 40 to move along the Z axis.

[0032] The magnet 60 provides the voice coil 70 with the magnetic field required for operation. The magnet 60 may be a ferrite magnet. Preferably, the magnet 60 is a neodymium magnet. The interaction between the magnetic field generated by the voice coil 70 and the static magnetic field of the magnet 60 causes the voice coil 70 and the attached cone diaphragm 40 to move along the Z axis.

[0033] The coaxial loudspeaker 100 may further include one or more pole pieces. The pole pieces are configured to guide and concentrate the magnetic field of the magnet 60 to effectively interact with the voice coil 70. The one or more pole pieces may include a T-shaped pole piece (also referred to as a T-shaped magnet 80). The T-shaped pole piece 80 has: a flat and radial portion located on the upper side or the lower side of the magnet; and an axial portion extending from the radial inner end of the radial portion along the Z axis. The one or more pole pieces may also include a magnetic conductive plate 50, which is located on the other side of the radial portion of the T-shaped pole piece 80, so that the magnet 60 is interposed between the magnetic conductive plate 50 and the radial portion of the T-shaped pole piece 80.

[0034] The shapes and positions of these additional elements (including magnet 60, voice coil 70, pole pieces 50, 80) are not essential elements to the present invention and thus may be changed or modified as desired.

[0035] The second driver unit 10 may include similar components to the first driver unit to output the second frequency sound, such as a magnet, a voice coil and a diaphragm (not shown). The second driver unit may include a compression driver, in which the radiating diaphragm is larger than the horn throat to increase radiation resistance.

[0036] The coaxial speaker 100 further includes a fixed waveguide 30A. The fixed waveguide 30A is configured to guide the sound within the second frequency range from the second driver unit 10. The fixed waveguide 30A has a mouth 34 located at the outer edge of the fixed waveguide 30A, a throat 36 located at one end, and at least three flared surfaces, the at least three flared surfaces including a first flared surface S1, a second flared surface S2, and a third flared surface S3, extending from the throat 36 to the mouth 34, respectively. Therefore, the fixed waveguide 30A defines a channel for guiding the sound from the second driver unit 10. The flared shape is a shape in which the width or diameter of the channel gradually increases from the throat 36 to the mouth 34. At least three flared surfaces have shapes different from each other.

[0037] like Figure 1 and Figure 1A In the example shown, three adjacent flared surfaces S1, S2 and S3 have different shapes from each other. This arrangement can have different directivity patterns not only on the vertical axis and the horizontal axis, but also between any upward angles in the horizontal plane.

[0038] Preferably, the flared surfaces S1, S2, S3 have different flaring angles relative to the Z axis. Preferably, the flared surfaces S1, S2, S3 are at least partially convex surfaces. In the case where each flared surface is a convex surface, such as Figure 1A As shown, the flare angle is defined as the angle between the Z-axis and a tangent line to the flared surface extending from a point on the Z-axis at the throat 36 .

[0039] Additionally or alternatively, the arc lengths at the outer edges of the mouths 34 of the flared surfaces S1, S2, S3 may be different from each other. Preferably, there is substantially no discontinuity between the outer edges of adjacent flared surfaces S1, S2, S3. In one embodiment, each joint between adjacent flared surfaces S1, S2, S3 may form an edge line, in other words, adjacent surfaces S1, S2, S3 may be connected to each other with a dihedral angle less than 180 degrees. Preferably, the range of the main dihedral angle between the first flared surface S1 and the second flared surface S2 is 80 to 150 degrees, preferably 100 to 140 degrees, and / or the range of the main dihedral angle between the second flared surface S2 and the third flared surface S3 is 70 to 130 degrees, preferably 80 to 120 degrees. This ensures that the surfaces S1, S2, S3 present different sound directivity from each other.

[0040] In a preferred arrangement, the coaxial loudspeaker further comprises two or more radial waveguides 20A. Each radial waveguide 20A extends from the mouth 34 to the outer edge of the cone diaphragm 40 along the radial direction of the cone diaphragm 40. Preferably, the mouth 34 of the fixed waveguide 30A can be butted against the radial waveguide 20A. The surface of the radial waveguide 20A and the flared surfaces S1, S2, S3 of the fixed waveguide 30A can be substantially continuous and uninterrupted.

[0041] The radial waveguide 20A can be preferably attached to the surface of the cone diaphragm 40, which is located on the other side of the magnet, through an adhesive. Alternatively, the radial waveguide 20A can be integrated (integrally formed) with the cone diaphragm 40. This allows the radial waveguide 20A to move synchronously with the cone diaphragm 40.

[0042] Each radial waveguide 20A may extend in a radial direction from the mouth 34 of the fixed waveguide 30A to the outer edge of the cone diaphragm 40. In other words, the tangent line of the radial inner end of the radial waveguide 20A and the tangent line of the radial outer end of the flared surfaces S1, S2, S3 of the fixed waveguide 30A substantially coincide with or are parallel to each other.

[0043] When the cone diaphragm 40 of the first driver unit is stationary, the profile of each radial waveguide 20A can extend substantially continuously from the mouth 34 of the fixed waveguide 30A to the outer edge of the cone diaphragm 40. In other words, the tangent line of the radial inner end of the radial waveguide 20A and the tangent line of the radial outer end of the flared surface S1, S2, S3 of the fixed waveguide 30A are substantially coincident or parallel to each other. Therefore, the radial waveguide 20A can be considered as a "moving" waveguide because the radial waveguide 20A is non-static in use.

[0044] At least one of the radial waveguides 20A has two or more different flared portions. Figure 1 In the embodiment, each radial waveguide 20A includes a first flared portion A and a second flared portion B.

[0045] The surfaces of the first flared portion A and the second flared portion B may have different curved surfaces. The first flared portion A may extend from the first flared surface S1 of the fixed waveguide 30A along a substantially continuous radial direction to the outer edge of the conical diaphragm 40. The second flared portion B may extend from the second flared surface S2 of the fixed waveguide 30A along a substantially continuous radial direction to the outer edge of the conical diaphragm 40. That is to say, the first flared portion A and the second flared portion B correspond to the first flared surface S1 and the second flared surface S2, respectively, wherein the intersection line of the first flared surface S1 and the first flared portion A is L1, and the intersection line of the second flared surface S2 and the second flared portion B is L2. Furthermore, the intersection line of the third flared surface S3 and the conical diaphragm 40 is L3. Preferably, on the common plane of the intersection lines L1 and L2, the angle between the intersection lines L1 and L2 ranges from 70 to 120 degrees. And / or, on the coplane of the intersection lines L2 and L3, the angle between the intersection lines L2 and L3 is 90 to 150 degrees.

[0046] Preferably, the surfaces of the adjacent flared portions (for example, the surfaces of the first flared portion A and the second flared portion B) are discontinuous with each other. The junction between two adjacent flared surfaces of different shapes forms a ridge. This means that there is a boundary between the flared surface of the first flared portion A and the flared surface of the second flared portion B. In other words, the curvature of the adjacent flared portions A and B does not change continuously. Preferably, in one embodiment, the junction between the first flared portion A and the second flared portion B has at least one step or stepped structure. In other words, the thickness of the adjacent flared portions A and B at the junction is different from each other. This may produce more sound reflections. Preferably, the height of the joint surface between the adjacent first flared portion A and the second flared portion B (that is, the step height) gradually increases, at least from the outer edge of the conical diaphragm 40 to the radially innermost and thickest position of the first flared portion A. This may produce more unique sound reflection changes.

[0047] The shape of each radial waveguide 20A in a plan view may be a fan-shaped shape having an outer arc, an inner arc and two radii connecting the two arcs. Preferably, each outer arc of the radial waveguide 20A is adjacent to and aligned with / flush with the outer edge of the cone diaphragm 40 .

[0048] Preferably, each radial waveguide 20A may include or be made of a foamed polypropylene (FPP) material, or a paper material. Such a material is lightweight, and therefore has little adverse effect on the movement of the cone diaphragm 40, and is easy to shape. Each radial waveguide 20A may be attached to the surface of the cone diaphragm 40.

[0049] If the surfaces of the first flared portion A and the second flared portion B are discontinuous with each other and / or the surfaces of the first flared portion A and the second flared portion B have different curved shapes, more reflections are expected. The first flared portion A and the second flared portion B have different surface curvatures, respectively. Preferably, the maximum surface curvature of the first flared portion A is greater than the maximum surface curvature of the second flared portion B. In addition, when viewed along the Z axis, that is, from a top viewpoint, the center angle of the first flared portion A is greater than the center angle of the second flared portion B.

[0050] In addition, the coaxial speaker 100 including the radial waveguide 20A in combination with the fixed waveguide 30A can generate sound waves covering all audio frequency ranges.

[0051] The first modification of Embodiment 1:

[0052] Figure 2 FIG. 1 shows a variation according to Embodiment 1. Specifically, the coaxial speaker 100A has Figure 1 The coaxial speaker 100 has a similar structure and includes a fixed waveguide 30A and two radial waveguides 20A disposed on a cone diaphragm 40 .

[0053] In this variant embodiment, the two radial waveguides 20A are asymmetrical to each other. The central angles of the two radial waveguides 20A may be different from each other, the radial waveguides 20A may have different numbers of flared portions, and / or the flared portions may have different flared surfaces from each other. This arrangement may further shift the directionality of the sound from the on-axis plane.

[0054] Second modification example of Embodiment 1:

[0055] Figure 3 1 shows another variation of the first embodiment. Specifically, the coaxial speaker 100B has Figure 1 The coaxial speaker 100 has a similar structure and includes a fixed waveguide 30A and a radial waveguide 20A arranged on a conical diaphragm 40.

[0056] In this variant embodiment, the coaxial loudspeaker 100B includes more than two radial waveguides 20A. Figure 3 In the embodiment, the coaxial loudspeaker 100B includes four radial waveguides 20A. Preferably, these radial waveguides 20A have mutually different shapes. The central angles of the two radial waveguides 20A may be the same or different, the radial waveguides 20A may have different numbers of flared portions, and / or the flared portions may have mutually different flared surfaces. This arrangement may further shift the directionality of the sound from the on-axis plane.

[0057] The third modification of Embodiment 1:

[0058] Figure 41 shows another variation of the first embodiment. Specifically, the coaxial speaker 100C has Figure 1 The coaxial loudspeaker 100 of the present invention has a similar structure and comprises a fixed waveguide 30A and two radial waveguides 20A. In this variation, the two radial waveguides 20A are connected to each other via one or more coupling members D. The two radial waveguides are thus integrated into one piece.

[0059] In addition, the two identical radial waveguides 20A are symmetrically arranged along the diameter, and each of the two radial waveguides 20A has a first flared portion A and two second flared portions B, wherein the two second flared portions B have the same shape and size and are located on both sides of the first flared portion A and adjacent to the first flared portion A.

[0060] The fixed waveguide 30A has different flared surfaces, and the different flared surfaces include at least two first flared surfaces S1 , four second flared surfaces S2 , and two third flared surfaces S3 .

[0061] Preferably, one or more coupling members D are made of the same material as the radial waveguide 20A. Preferably, the radial waveguide and the coupling member D are both made of foamed polypropylene (FPP). Such an integrally formed waveguide is easy to manufacture and easy to assemble to the cone diaphragm 40.

[0062] Example 2

[0063] Figure 5 Another coaxial speaker 200 according to Embodiment 2 of the present invention is shown.

[0064] The difference between the second embodiment and the first embodiment is that the coaxial speaker 200 includes an isolated or independent fixed waveguide 30B having a flared cone structure. In the second embodiment, the same reference numerals are used for the parts common to the first embodiment, and the description thereof is omitted. In addition, the features different from the first embodiment are mainly described.

[0065] The isolated fixed waveguide 30B has a mouth 34A at the outer edge of the fixed waveguide 30B and a throat 36A at one end. Figure 5A As shown, the isolated fixed waveguide 30B includes at least three different flared surfaces, including a first flared surface S1, a second flared surface S2, and a third flared surface S3. These flared surfaces S1, S2, and S3 have mutually different shapes, similar to the fixed waveguide in Embodiment 1. Each flared surface S1, S2, and S3 extends from the throat 36A to the outer edge of the mouth 34A of the fixed waveguide 30B.

[0066] This arrangement can have different directivity patterns in addition to the vertical and horizontal axes, and can also have different directivity patterns between any upward angles in the horizontal plane.

[0067] Preferably, the height of the mouth 34A of the fixed waveguide 30B is at least greater than half the height of the cone diaphragm 40. More preferably, the height of the mouth 34A of the fixed waveguide 30B is equal to or greater than the height of the cone diaphragm 40. Therefore, a wider dispersion can be achieved.

[0068] like Figure 5A As shown, the throat 36A of the fixed waveguide 30B has a unique shape in horizontal cross section and constitutes a slit aperture AP, which is preferably symmetrical in only one plane along the Z axis. In one embodiment, in a cross section along a plane perpendicular to the Z axis, the shape of the slit aperture AP may be approximately fan-shaped or teardrop-shaped. This asymmetry produces different directivity patterns at different elevation angles from the horizontal plane, and mostly affects the high frequency range.

[0069] like Figure 5A As further shown, the horizontal cross-sectional shape of the fixed waveguide 30B is symmetrical only in one plane, symmetrical in the vertical direction but asymmetrical in the left-right direction.

[0070] Preferably, the junction between two adjacent flared surfaces of different shapes is formed by a smooth surface. In other words, the curvatures of the adjacent flared surfaces change continuously.

[0071] The lower end of the fixed waveguide 30B may be connected to a pole piece of the first driver unit, for example attached to a T-iron 80 .

[0072] Preferably, the mouth 34A of the fixed waveguide 30B has a flared surface design extending from the throat 36A of the fixed waveguide 30B along the main surface of the cone diaphragm 40 while maintaining a certain gap from the main surface of the cone diaphragm 40. In other words, there is a space between the cone diaphragm 40 and the fixed waveguide 30B.

[0073] Since the shape of the fixed waveguide 30B is unique and does not have two symmetric planes, this embodiment can achieve different directional patterns on the vertical axis and the horizontal axis through the integrated fixed waveguide, and can also achieve different directional patterns between any upward angles in the horizontal plane.

[0074] Preferably, the fixed waveguide 30B has an integral structure. The unique 3D shape of the fixed waveguide 30B is symmetrical only in one plane, which can have different directivity patterns in the horizontal plane and the vertical plane at different upward positions relative to the horizontal axis. The shape of the fixed waveguide 30B can be a flared shape with a narrow entrance and a wide exit, similar to a horn shape.

[0075] The throat 36A of the fixed waveguide 30B forms a small slit aperture AP that is symmetrical in only one plane. This asymmetry produces different directivity patterns at different upward angles relative to the horizontal plane, and mostly affects the high frequency range.

[0076] The fixed waveguide 30B includes at least three different shaped flared surfaces S1, S2, S3. When the coaxial loudspeaker 200 is raised relative to the horizontal plane, the combination of the three different shaped flared surfaces S1, S2, S3 achieves two different horizontal directivities and mostly affects the mid-range frequencies, preferably in the range of 500-2000 Hz.

[0077] The combination of these three differently shaped flared surfaces within the integral fixed waveguide 30B forms a unique design with only one plane of symmetry, ensuring different horizontal directivities across the frequency range when the loudspeaker is tilted relative to the horizontal.

[0078] The first modification example of Embodiment 2:

[0079] Figure 5B FIG. 2 shows a variation according to Embodiment 2. Specifically, the coaxial speaker 200A has Figure 5 The coaxial speaker 200 has a similar structure.

[0080] In this variant embodiment, the isolated fixed waveguide 30B has a mouth 34A at its outer edge and a throat 36A at one end. Figure 5B As shown, the isolated fixed waveguide 30B includes at least three different flared surfaces, including a first flared surface S1, a second flared surface S2, and a third flared surface S3. Each flared surface S1, S2, S3 extends from the throat 36A to the outer edge of the mouth 34A of the fixed waveguide 30B. Preferably, the outer edges of the flared surfaces S1, S2, S3 are located in the same plane. Figure 5 Unlike the embodiment of the present invention, at least a portion of the throat 36A is located within the inner diameter of a pole piece (e.g., a T-shaped iron 80), and the thickness of the fixed waveguide 30B decreases from the throat 36A to the mouth 34A, which provides a strong structure of the fixed waveguide 30B. The fixed waveguide 30B can be fixed to the pole piece (e.g., a T-shaped iron 80) by adhesive or ultrasonic bonding, or the fixed waveguide 30B can be molded on the pole piece by injection molding as a mold insert.

[0081] Example 3

[0082] Figure 6It is another coaxial loudspeaker 300 of embodiment 3 of the present invention. Embodiment 3 is different from embodiment 1 in that the coaxial loudspeaker 300 includes a movable waveguide 20B instead of a radial waveguide 20A, and includes a tube element 90 instead of a fixed waveguide 30A. In embodiment 3, the same figure marks are marked on the same parts as in embodiment 1, and the description is omitted. In addition, most of the descriptions are features that are different from embodiment 1. Preferably, the tube element 90 is an aluminum tube. Preferably, the overall wall thickness of the tube element 90 is uniform. The tube element 90 can be arranged above the T-iron 80 so that the tube element 90 defines another channel for guiding the sound from the second driver unit 10. It should be noted that a radial gap is generated between the voice coil 70 and the tube element 90.

[0083] The moving waveguide 20B has a main body 24A (mouth) which is attached to or integrated with the surface of the cone diaphragm 40, and an extension 26A (throat) which is a portion away from the main surface of the cone diaphragm 40. The extension 26A is located in the radial gap. For example, at least a portion of the extension 26A is located between the voice coil 70 and the tube element 90, so that the extension 26A can move along the Z axis in the radial gap. In other words, the extension 26A can move up and down in the radial gap, and the moving waveguide 20B can move synchronously with the cone diaphragm 40. The extension 26A guides the movement of the cone diaphragm 40 along the Z axis, suppressing unnecessary diaphragm movement and noise caused by the diaphragm that becomes heavier due to the moving waveguide 20B. The extension 26A can also be used as a stopper for the cone diaphragm 40, which is particularly helpful for carrying the speaker and can reduce or prevent damage to the diaphragm during transportation. The moving waveguide 20B, together with the tube element 90, can help guide and transmit the sound from the second driver unit 10. In addition, the coaxial speaker 300 includes the moving waveguide 20B and is combined with the pipe element 90 to generate sound waves covering the entire audio frequency range.

[0084] The moving waveguide 20B may have a flared horn structure, the outer edge of the main body portion 24A of which generally extends from the extension portion 26A of the moving waveguide 20B in a substantially continuous radial direction, and is attached to or integrated with the surface of the cone diaphragm 40. The moving waveguide 20B is arranged to move synchronously with the cone diaphragm 40. The flared horn structure is a conical cylinder with a narrow inlet and a wide outlet, and is shaped like a horn.

[0085] In the present embodiment 3, the extension 26A of the moving waveguide 20B is located in the gap between the pipe element 90 and the voice coil 70. The pipe element 90 functions similarly to the fixed waveguide, and is used to propagate high frequency sound from the second driver unit 10 to the moving waveguide 20B.

[0086] Preferably, the main body portion 24A of the moving waveguide 20B includes at least three flared surfaces of different shapes, each of which extends from the extension portion 26A to the outer edge of the main body portion 24A. Therefore, these three flared surfaces of different shapes are combined in the one-piece body of the moving waveguide 20B to form a unique design with only one symmetry plane, and ensure that different horizontal orientations are maintained over the entire frequency range when it is raised relative to the horizontal plane.

[0087] Preferably, the moving waveguide 20B is made of a paper material, such as a pulp material. Additionally or alternatively, the thickness of the moving waveguide 20B may be 1 mm or less. This makes the speaker lightweight and compact. The moving waveguide 20B may be attached by gluing, which is usually used to attach a dust cover.

[0088] Alternatively, the moving waveguide 20B may include or be made of a foamed polypropylene (FPP) material, or a paper material. This makes the speaker light and strong.

[0089] The first modification of Embodiment 3:

[0090] Fig. 6A FIG. 2 shows a variation according to Embodiment 3. Specifically, the coaxial speaker 300A has Figure 6 The coaxial speaker 300 has a similar structure.

[0091] In this variation, at least two moving waveguides 20B are arranged with each other. The two moving waveguides 20B are connected with each other through one or more coupling members D. Therefore, the two moving waveguides are integrated into one. Preferably, the height of the main body 24A of the moving waveguide 20B is at least greater than half the height of the cone diaphragm 40. The moving waveguide 20B is arranged to surround the mouth 92 of the pipe element 90, and the joint between the pipe element 90 and the moving waveguide 20B has at least one step structure 91 generated by the thickness of the pipe element 90. This will generate more sound reflections.

[0092] Preferably, one or more couplings are made of the same material as the moving waveguide 20B. Preferably, the moving waveguide and the coupling D are both made of foamed polypropylene (FPP). Such an integrated waveguide is easy to manufacture and easy to assemble onto the conical diaphragm 40. Preferably, at least one moving waveguide 20B has at least one recessed structure on the side facing the conical diaphragm 40, which reduces the weight of the moving waveguide 20B without affecting the expected acoustic properties. Preferably, each moving waveguide 20B has two or more recessed structures on the side facing the conical diaphragm 40, for example, a first recessed structure 201 and a second recessed structure 202. More preferably, the two or more recessed structures 201, 202 in each moving waveguide 20B are adjacent to each other in the radial direction of the conical diaphragm 40. More preferably, the recessed volume of the first recessed structure 201 arranged radially outward is larger than the recessed volume of the second recessed structure 202 arranged radially inward. The volume and position of the recessed structures 201 and 202 can be designed to ensure a balanced weight distribution between the two or more mobile waveguides 20B, thereby ensuring a uniform weight distribution of the conical diaphragm 40 including the mobile waveguide 20B. It is worth noting that the surfaces of the first recessed structure 201 and the second recessed structure 202 do not contact the surface of the conical diaphragm 40.

[0093] Second modification example of Embodiment 3:

[0094] Figure 6B 2 shows another variation according to Embodiment 3. Specifically, the coaxial speaker 300B has Figure 6 The coaxial speaker 300 has a similar structure.

[0095] In this variation, the tube element 90 can be inserted into and positioned within the shaft portion of the T-iron 80. Therefore, the extension portion 26A of the movable waveguide 20B (e.g., the lower portion of the movable waveguide 20B) is located in the gap between the tube element 90 and the shaft portion of the T-iron 80. The tube element 90 functions similarly to a fixed waveguide for transmitting high-frequency sound from the second driver unit 10 to the movable waveguide 20B. The extension portion 26A can also be used as a stopper for the conical diaphragm 40, which is particularly helpful in transporting the loudspeaker and can reduce or prevent damage to the diaphragm during transportation. Similar Fig. 6A In the embodiment of the present invention, the surface of the movable waveguide 20B facing the conical diaphragm 40 has at least one concave structure 203. As described above, the movable waveguide 20B may have two or more concave structures adjacent to each other in the radial direction of the conical diaphragm 40. It is worth noting that the surface of the concave structure 203 does not contact the surface of the conical diaphragm 40. Preferably, the pipe element 90 also has a radially extending structure (disk-shaped structure) 90A, which is used to fix the pipe element 90 to the T-shaped iron 80.

[0096] The above is a detailed introduction to the coaxial loudspeaker provided in the embodiment of the present application. For those skilled in the art, according to the idea of ​​the embodiment of the present application, there will be some changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as a limitation on the present application. All equivalent modifications or changes made according to the spirit and technical ideas of the present application should still be covered by the claims of the present application.

Claims

1. A coaxial speaker, comprising a first driver unit and a second driver unit, wherein the first driver unit and the second driver unit radiate sound independently from the same axis. The first driver unit includes a cone diaphragm and is configured to primarily output sound within a first frequency range; The second driver unit is configured to mainly output sound in a second frequency range higher than the first frequency range, and the second driver unit includes: a fixed waveguide configured to guide sound within the second frequency range radiated by the second driver unit; The fixed waveguide has a mouth located at the outer edge of the fixed waveguide, a throat located at the end, and at least three flared surfaces, the at least three flared surfaces include a first flared surface, a second flared surface and a third flared surface, and the at least three flared surfaces extend from the throat to the mouth of the fixed waveguide, respectively. The at least three flared surfaces have shapes different from each other.

2. The coaxial loudspeaker according to claim 1, further comprising two or more radial waveguides, wherein: The two or more radial waveguides extend from the mouth of the fixed waveguide to the outer edge of the conical diaphragm along the radial direction respectively and have a flared surface.

3. The coaxial speaker according to claim 2, wherein: The radial waveguides are attached to, or integrated with, a major surface of the conical diaphragm.

4. The coaxial speaker according to claim 2, wherein: Each of the radial waveguides includes more than two flared portions, wherein the more than two flared portions include a first flared portion and a second flared portion. Surfaces of adjacent flared portions are discontinuous with each other, and at least one step structure is formed at a junction between adjacent flared portions.

5. The coaxial loudspeaker according to claim 1, wherein: The joints between the adjacent flared surfaces form a ridge line, or the joints between the adjacent flared surfaces form a smooth surface.

6. The coaxial loudspeaker according to claim 5, wherein: The dihedral angle at the junction between the first flared surface and the second flared surface is in the range of 80 to 150 degrees, and / or the dihedral angle at the junction between the second flared surface and the third flared surface is in the range of 70 to 130 degrees.

7. The coaxial loudspeaker according to claim 4, wherein: The first flared surface and the first flared portion are connected to each other at a first intersection line, the second flared surface and the second flared portion are connected to each other at a second intersection line, and the third flared surface and the third flared portion are connected to each other at a third intersection line. Wherein, on the common plane of the first intersection line and the second intersection line, the angle between the first intersection line and the second intersection line is in the range of 70 to 120 degrees, and / or on the common plane of the second intersection line and the third intersection line, the angle between the second intersection line and the third intersection line is in the range of 90 to 150 degrees.

8. The coaxial loudspeaker according to claim 4, wherein: The first flared portion and the second flared portion have different surface curvatures respectively, and the maximum surface curvature of the first flared portion is greater than the maximum surface curvature of the second flared portion.

9. The coaxial loudspeaker according to claim 8, wherein: A step is formed between the first flared portion and the second flared portion, and the height of the step gradually increases from at least the outer edge of the conical diaphragm to the radially innermost and thickest position of the first flared portion.

10. The coaxial loudspeaker according to claim 1, wherein: The fixed waveguide has a flared horn structure. The fixed waveguides protrude from the main surface of the conical diaphragm, The height of the mouth of the fixed waveguide is at least greater than half of the height of the conical diaphragm, and the fixed waveguide has a symmetrical cross-section only in a plane along the axis.

11. The coaxial loudspeaker according to claim 10, wherein: The flared horn structure comprises a throat with a slit aperture, the slit aperture is symmetrical only in one plane along the axis, and the shape of the slit aperture is approximately fan-shaped or tear-drop-shaped.

12. The coaxial loudspeaker according to claim 11, wherein: The throat is fixed to a pole piece of the first driver unit, the throat being at least partially disposed radially inwardly of an axial portion of the pole piece of the first driver unit.

13. The coaxial loudspeaker according to claim 10, wherein: The flared horn structure has a throat, and at least a portion of the throat of the fixed waveguide is disposed within an inner diameter of the pole piece.

14. The coaxial loudspeaker according to claim 10, wherein: The outer edges of the first flared surface, the second flared surface and the third flared surface are located in the same plane.

15. The coaxial loudspeaker according to claim 2, wherein: The radial waveguide is at least partially made of a foamed polypropylene (FPP) material or a paper material.

16. A coaxial speaker comprising a first driver unit and a second driver unit, wherein the first driver unit and the second driver unit radiate sound independently from the same axis. The first driver unit includes a cone diaphragm and a voice coil, and is configured to mainly output sound within a first frequency range, and the second driver unit is configured to mainly output sound within a second frequency range higher than the first frequency range, and the second driver unit includes: a moving waveguide configured to guide the sound within the second frequency range radiated by the second driver unit, the moving waveguide being attached to a main surface of the cone diaphragm or integrated with the main surface so as to move synchronously with the cone diaphragm; as well as a tube element configured to guide sound from the second driver unit to the moving waveguide, a radial gap being formed between the tube element and the voice coil, The movable waveguide has an extension portion which is located in the radial gap and can move along the axis in the radial gap.

17. The coaxial loudspeaker according to claim 16, wherein: The movable waveguide has at least one concave structure on a side facing the conical diaphragm, and a surface of the concave structure is separated from a surface of the conical diaphragm.

18. The coaxial loudspeaker according to claim 17, wherein: The movable waveguide has more than two recessed structures on the side facing the conical diaphragm, and the two or more recessed structures include a first recessed structure and a second recessed structure. The first recessed structure and the second recessed structure are adjacent to each other along the radial direction of the conical diaphragm, and the recessed volume of the first recessed structure arranged radially outward is larger than the recessed volume of the second recessed structure arranged radially inward.

19. The coaxial loudspeaker according to claim 16, wherein: The tube element also has radially extending structure secured to the pole piece.

20. The coaxial loudspeaker according to claim 16, wherein: The moving waveguide is at least partially made of foamed polypropylene (FPP) material or paper material.

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