CN220830539U - Horn and projector - Google Patents

Abstract

The utility model discloses a loudspeaker, which comprises a support, a vibrating diaphragm, magnetic steel, a magnetic shield, a voice coil and a magnetic shield, wherein the vibrating diaphragm is arranged on the support, the voice coil is arranged on the vibrating diaphragm, the magnetic steel is at least partially arranged in the magnetic shield, and the magnetic steel and the magnetic shield are used for forming a magnetic field which interacts with current in the voice coil to enable the voice coil to move; the magnetic shielding cover is fixed on the magnetic cover or the bracket, the magnetic shielding cover is provided with a containing cavity, and the magnetic steel and the magnetic cover are integrally arranged in the containing cavity. The utility model also discloses a projector comprising the loudspeaker. The loudspeaker and the projector provided by the utility model can effectively shield the leakage of the magnetic field, and are beneficial to compact design of the projector.

Description

Horn and projector

Technical Field

The utility model relates to the technical field of loudspeaker equipment, in particular to a loudspeaker and a projector.

Background

In an electronic device with a sound box, if the loudspeaker is far away from other magnetic driving components of the device, the loudspeaker is not easy to cause interference, and the situation of magnetic field leakage of the loudspeaker is not required to be shielded relatively strictly. However, if the horn is located relatively close to other magnetic driving components, the magnetic field of the horn tends to interfere with the operation of the magnetic driving components, resulting in affecting the proper operation of the device.

The foregoing background is only for the purpose of facilitating an understanding of the principles and concepts of the utility model and is not necessarily in the prior art to the present application and is not intended to be used as an admission that such background is not entitled to antedate such novelty and creativity by virtue of prior utility model or that it is already disclosed at the date of filing of this application.

Disclosure of utility model

In order to solve the technical problems, the utility model provides a loudspeaker and a projector, which can effectively shield the leakage of a magnetic field and are beneficial to compact design of the projector.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

In a first aspect, the utility model discloses a loudspeaker, which comprises a bracket, a vibrating diaphragm, magnetic steel, a magnetic shield, a voice coil and a magnetic shield, wherein the vibrating diaphragm is arranged on the bracket, the voice coil is arranged on the vibrating diaphragm, the magnetic steel is at least partially arranged in the magnetic shield, and the magnetic steel and the magnetic shield are used for forming a magnetic field which interacts with current in the voice coil to enable the voice coil to move; the magnetic shielding cover is fixed on the magnetic cover or the bracket, the magnetic shielding cover is provided with a containing cavity, and the magnetic steel and the magnetic cover are integrally arranged in the containing cavity.

Further, a vent is provided on the bracket, the vent is wrapped in the magnetic shield, a gap exists between the magnetic shield and the bracket, and the vent is communicated with the outside through the gap.

Further, the horn also includes a buffer; wherein the buffer is connected between the magnetic shield and the magnetic shield, and/or the buffer is connected between the magnetic shield and the bracket.

Further, the loudspeaker further comprises a fastener, an assembly hole is formed in one side, away from the magnetic steel, of the magnetic shield, a through hole is formed in the bottom of the accommodating cavity, the fastener penetrates through the through hole and is fixed to the assembly hole, the magnetic shield is fixed to the magnetic shield, and the fastener is a magnetic shield.

Further, the hole wall of the through hole extends towards the assembly hole, and the fastening piece abuts against the hole wall.

Further, a groove is formed in one side, away from the magnetic steel, of the magnetic cover, and the hole wall of the through hole is at least partially located in the groove.

Further, the magnetic shielding cover is propped against the magnetic cover through the end part of the hole wall of the through hole, and the rest cavity walls of the accommodating cavity are spaced from the magnetic cover and the bracket.

Further, a groove is formed in one side, away from the magnetic steel, of the magnetic cover, an annular boss is formed at the bottom of the accommodating cavity, extends into the groove, and abuts against the groove through a buffer piece.

In a second aspect, the utility model discloses a projector, which comprises a housing and the loudspeaker in the first aspect, wherein the loudspeaker is arranged in the housing.

Further, the projector further comprises a light machine color wheel assembly, one side of the loudspeaker, provided with the magnetic shielding cover, faces the light machine color wheel assembly, the light machine color wheel assembly is arranged in the shell, and the distance between the magnetic steel in the loudspeaker and the color wheel motor in the light machine color wheel assembly is within 20 mm.

Compared with the prior art, the utility model has the beneficial effects that: according to the loudspeaker provided by the utility model, the magnetic steel and the magnetic cover which are matched to form the magnetic field are integrally arranged in the accommodating cavity of the magnetic shielding cover, so that the magnetic field can be effectively shielded from leakage, and magnetic interference is not easy to be caused to other magnetic driving parts even if the loudspeaker is close to the magnetic driving parts; therefore, the distance between the loudspeaker and a device driven by magnetic force in the projector is relatively short, the operation of the magnetic driving component is not disturbed, and the compact design of the projector is facilitated.

In a further aspect, the utility model further includes, but is not limited to, the following advantages:

(1) The air port is arranged on the support, the air port can be communicated with the outside to ensure the original effect of the air port, and the air port is wrapped in the magnetic shielding cover to prevent magnetic leakage at the air port.

(2) The magnetic shield is provided with a through hole, and the magnetic shield is connected with the magnetic shield through the fastening piece of the magnetic shield in an assembling way, so that the magnetic shield and the magnetic shield can be tightly connected, and the magnetic leakage can be effectively prevented; further, the through holes formed in the magnetic shielding cover extend towards the assembly holes, so that the contact area between the fastening pieces and the walls of the through holes can be increased, the fastening pieces can provide more radial supporting force for the magnetic shielding cover, the magnetic shielding cover is prevented from shaking in the radial direction, and the structural stability is improved; furthermore, a groove is formed in one side, away from the magnetic steel, of the magnetic cover, so that the hole wall of the through hole is at least partially positioned in the groove, and the whole thickness of the loudspeaker is favorably compressed.

(3) The magnetic shield is characterized in that one side, deviating from the magnetic steel, of the magnetic shield is provided with a groove, an annular boss is formed at the bottom of the accommodating cavity of the magnetic shield, the annular boss can extend into the groove, the whole thickness of the compression loudspeaker can be facilitated, and the magnetic shield can be effectively prevented from being inclined along any direction.

Drawings

FIG. 1 is a schematic view of a horn according to a preferred embodiment of the present utility model;

FIG. 2 is a schematic diagram of an exploded construction of the horn of FIG. 1;

FIG. 3 is a schematic view of the internal structure of the magnetic shield of the horn of FIG. 1;

FIG. 4 is a schematic cross-sectional view of the horn of FIG. 1;

fig. 5 is a schematic view showing the structure of a projector according to a preferred embodiment of the present utility model;

fig. 6 is an enlarged schematic view at a in fig. 5.

Detailed Description

The following describes embodiments of the present utility model in detail. It should be emphasized that the following description is merely exemplary in nature and is in no way intended to limit the scope of the utility model or its applications.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. In addition, the connection may be for both the fixing action and the circuit/signal communication action.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing embodiments of the utility model and to simplify the description by referring to the figures, rather than to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present utility model, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

As shown in fig. 1, the preferred embodiment of the present utility model discloses a loudspeaker 100, and in combination with fig. 4, the loudspeaker 100 comprises a support 10, a diaphragm 20, a magnetic steel 30, a magnetic shield 40, a voice coil 50 and a magnetic shield 60, wherein the diaphragm 20 is arranged on the support 10, the voice coil 50 is arranged on the diaphragm 20, the magnetic steel 30 is at least partially arranged in the magnetic shield 40, the magnetic shield 40 is used for preventing the magnetic field of the magnetic steel 30 from leaking outwards, and meanwhile, the magnetic steel 30 and the magnetic shield 40 are also used for forming a magnetic field which interacts with the current in the voice coil 50 to enable the voice coil 50 to move; washer 31 is sleeved on magnetic steel 30, magnetic shield 40 adopts U-shaped iron, and voice coil 50 is electrically connected with terminal 51; the voice coil 50 is sleeved on the periphery of the magnetic steel 30, and the terminal 51 is connected with the circuit board through a wire, so that the magnetic field generated by the voice coil 50 can be controlled through the magnitude and the frequency of current, and the voice coil 50 can further move on the periphery of the magnetic steel 30; the movement of the voice coil 50 can drive the vibrating diaphragm 20 to move, and then the vibrating diaphragm 20 is relied on to drive the gas vibrator to realize outward sound production. The magnetic shielding cover 60 is fixed on the magnetic cover 40 or the bracket 10, the magnetic shielding cover 60 is in a cover structure, the thicknesses of the magnetic shielding cover 60 are consistent, the magnetic shielding cover 60 is provided with a containing cavity 61, the magnetic steel 30 and the magnetic cover 40 are integrally arranged in the containing cavity 61, namely, the magnetic steel 30 and the magnetic cover 40 are both arranged in the containing cavity 61 and do not exceed the containing cavity 61, so that a magnetic field formed by the magnetic steel 30 and the magnetic cover 40 can be effectively restrained in the containing cavity 61 of the magnetic shielding cover 60, and the magnetic field is prevented from leaking. The opening shape of the magnetic shield 60 is fitted to the bracket 10 and extends along the surface of the bracket 10.

Specifically, the magnetic shield cover 60 completely encloses the magnetic shield cover 40 from one side of the magnetic shield cover 40, and further completely encloses the magnetic steel 30 from the side, so that both the magnetic steel 30 and the magnetic shield cover 40 are completely located in the accommodating chamber 61 formed by the magnetic shield cover 60.

The bracket 10 is provided with a vent, and part of the vent in some embodiments is wrapped in the magnetic shielding cover 60, so that magnetic leakage at the vent can be prevented; and a gap exists between the magnetic shield 60 and the bracket 10 so that the vent can communicate with the outside through the gap to ensure the circulation of air flow to ensure the original function of the vent. Specifically, in the embodiment, with reference to fig. 2 and 4, an upper vent 11 and a lower vent 12 are provided on the support 10, the upper vent 11 is close to the diaphragm 20 relative to the lower vent 12 to realize the inner and outer circulation of air flow, and the air flow is led into the diaphragm 20 to provide air flow to help the vibration thereof, and meanwhile, heat in the horn 100 can be led out along with the air to assist in heat dissipation; however, the upper vent 11 and the lower vent 12 may be opened, which may cause the magnetic field to easily leak out from the vents; thus, the magnetic shield 60 is made to cover the lower vent 12 of the bracket 10 from the side in the present embodiment to reduce the leakage of the magnetic field. After shielding, the lower vent 12 may also have a communication space with the outside, for example, the magnetic shield 60 is spaced from the bracket 10 with a slight gap therebetween so that the outside air can be conducted to the lower vent 12 through the gap to enter the inside of the horn 100. However, in some embodiments the lower vent 12 need not be present and only the upper vent 11 may be present.

The horn 100 in this embodiment also includes a buffer 70; the bumper 70 is connected between the magnetic shield 60 and the magnetic shield 40, and/or between the magnetic shield 60 and the bracket 10 such that the magnetic shield 60 is spaced apart from the bracket 10, the magnetic shield 40, or most of the adjacent spaces. By providing the magnetic shield 60 at a distance from the bracket 10 and the magnetic shield 40, the high-frequency collision between the bracket 10, the magnetic shield 40 and the magnetic shield 60 due to fine and high-frequency vibration generated in the horn 100 during operation is avoided as much as possible, thereby avoiding noise and affecting sound quality. In some embodiments, the bumpers 70 may bond the magnetic shield 40 and the magnetic shield 60, respectively, such that the magnetic shield 60 may be secured to the magnetic shield 40. The buffer member 70 may be a common elastic shock absorbing member such as foam, silica gel pad, etc. In addition, the buffer members 70 in some embodiments are annular or are plural in number and are positioned rotationally symmetrically with respect to the magnetic shield 40, so that the magnetic shield 60 is further prevented from colliding with the magnetic shield 40 or the bracket 10 in any direction. Further, the buffer member 70 may be disposed in the accommodating cavity 61 near the opening to be connected with the magnetic shield 40, so that the magnetic shield 60 and the magnetic shield 40 can be effectively prevented from colliding. In some embodiments, the magnetic shield 60 has a stepped structure such that the outer surface of the magnetic shield 60 and the cavity wall portion of the accommodating cavity 61 form a stepped surface, and the buffer member 70 is provided on the stepped surface in the accommodating cavity 61 to be abutted against the magnetic shield 40 or the bracket 10, so that the buffer member 70 can be efficiently damped in the axial direction of the horn 100.

The loudspeaker in this embodiment further includes a fastener 80, where the magnetic shield 40 has an assembly hole 41 formed on a side facing away from the magnetic steel 30, a through hole 62 is formed at the bottom of the accommodating cavity 61, and the fastener 80 passes through the through hole 62 and is fixed to the assembly hole 41 to fix the magnetic shield 60 to the magnetic shield 40, and the fastener 80 is a magnetic shield (for example, the fastener 80 is made of a nickel-iron alloy material). The magnetic shield 60 is provided with the through hole 62, and the magnetic field generated by the magnetic steel leaks from the through hole 62, so that the fastener 80 is made of a magnetic shielding material in the embodiment, and the magnetic shield 60 after being perforated and assembled can still effectively prevent the magnetic leakage at the back of the loudspeaker.

Referring to fig. 4, to further increase the contact area of the fastener 80 and the through hole 62, the hole wall of the through hole 62 in some embodiments is extended toward the fitting hole 41, and the fastener 80 abuts against the extended hole wall of the through hole 62, thereby increasing the mounting stability of the magnetic shield 60, making the magnetic shield 60 less prone to rattle. For example, as shown in fig. 4, the hole wall of the through hole 62 is folded and extended toward the fitting hole 41 to form a folded hole wall, and the peripheral side of the fastener 80 abuts against the folded hole wall. Further, a groove 42 is formed on a side of the magnetic shield 40 away from the magnetic steel 30, and a hole wall of the through hole 62 is at least partially located in the groove 42 and does not protrude from an end surface of the magnetic shield 60, so that the thickness of the horn is reduced.

With continued reference to fig. 4, to further reduce collisions, the magnetic shield 60 in some embodiments may be abutted against the magnetic shield 40 by the ends of the walls of the through holes 62, with the remaining cavity walls of the receiving cavity 61 being spaced from the magnetic shield 40 and the bracket 10, i.e., the remaining structure of the magnetic shield 60 being spaced from the magnetic shield 40 and the bracket 10. By this arrangement, only one hard contact (i.e., the hole wall end of the through hole 62) is made between the magnetic shield 60 and the magnetic shield 40, and the rest is spaced (the buffer 70 may be provided at a part of the space to realize soft contact support), so that the collision at the time of vibration is reduced. Referring to fig. 3, an annular boss 63 is formed at the bottom of the receiving chamber 61, the annular boss 63 extends into the groove 42, and the annular boss 63 abuts against the groove 42 through a buffer member 70. By the arrangement of this structure, the effect of compressing the horn thickness can also be played, and the magnetic shield 60 can be effectively prevented from being skewed in any direction by the support of the annular boss 63.

In a specific embodiment, the magnetic shield 60 is spaced from the bracket 10 and the magnetic shield 40, and the magnetic shield 60 and the magnetic shield 40 are fixed by only one screw (i.e. the fastener 80), and other parts are abutted by a small amount of foam (i.e. the buffer 70), so that the magnetic shield 60 can be effectively prevented from falling off, and collision between the magnetic shield 60 and the magnetic shield 40 can be avoided. For example, a through hole 62 is formed in the middle of the top of the magnetic shield 60, a screw hole (i.e., an assembly hole 41) is formed in the bottom of the magnetic shield 40, and after the magnetic shield 60 is covered on the magnetic shield 40, the magnetic shield 60 is fixed by passing a screw through the through hole 62 and screwing in the screw hole; as shown in fig. 4, the top of the magnetic shield 40 is provided with ring-shaped foam to be abutted against the magnetic shield 60, so that the magnetic shield 60 is prevented from being skewed to collide with the bracket 10 or the magnetic shield 40. If the magnetic shield 60 collides with the magnetic shield 40 or the bracket 10, noise is generated to affect sound quality, so that it is necessary to reduce hard contact points between the magnetic shield 60 and other elements as much as possible (in this example, hard contact fixation is achieved by only one screw, and soft contact can be achieved by foam at other positions). Foam (i.e., cushioning material 70) may be provided near the magnetic shield 60 and the holder 10, and the foam may be looped around the holder 10. The position of the foam provided on the bracket 10 is closer to the outer edge of the magnetic shield 60 than the foam provided on the top of the magnetic shield 40, thereby supporting the magnetic shield 60 from a more peripheral position, and better preventing the magnetic shield 60 from being skewed with respect to the magnetic shield 40 to collide. Referring to fig. 2 and 3, the top of the magnetic shield 40 is formed with a groove 42, and the through hole 62 formed in the magnetic shield 60 extends into the groove 42, so that the through hole 62 extends toward the direction of the screw hole, and thus the wall surface of the through hole 62 has a larger contact surface with the screw, so that the screw is better matched with the screw, the screw can provide more radial supporting force for the magnetic shield 60, the magnetic shield 60 is prevented from shaking in the radial direction, and the structural stability is improved. At the same time, the screws are located in the grooves 42, which reduces the thickness of the horn as much as possible, contributing to miniaturization. The groove 42 is internally provided with annular foam, and the edge of the foam props against the wall of the groove 42, so that the foam is not easy to slide transversely, and the accommodating cavity 61 of the magnetic shielding cover 60 protrudes into the groove 42 to form an annular boss 63 to prop against the foam, as shown in fig. 4.

In another embodiment, to avoid direct contact between the magnetic shield 60 and the magnetic shield 40, a through hole may be formed in the axial direction of the silica gel pad by using a h-shaped silica gel pad, the through hole 62 of the magnetic shield 60 is clamped at the waist indent of the h-shaped silica gel pad, one end face of the h-shaped silica gel pad abuts against the magnetic shield 40, and a screw passes through the through hole of the silica gel pad to be locked in the threaded hole of the magnetic shield 40, and at this time, the magnetic shield 60 and the magnetic shield 40 are connected only by the silica gel pad.

In addition to the above embodiment, the magnetic shield 60 and the magnetic shield 40 are fixedly connected by matching the through holes penetrating the top of the magnetic shield 60 with the threaded holes at the bottom of the magnetic shield 40, and may be fixed on the bracket 10 at the opening edge of the magnetic shield 60 by means of screws and/or gluing, and the magnetic shield 40 is also separately fixed on the bracket 10.

In another embodiment, the magnetic shield 60 and the magnetic shield 40 may be fixed by gluing instead of screws, for example, by bonding with foam or directly with glue; wherein the magnetic shield cover 60 and the magnetic shield cover 40 are fixed by adopting an adhesive mode, preferably only a small area between the magnetic shield cover 60 and the magnetic shield 40 is glued, and other areas still have gaps, so that collision can be avoided. In a more preferred embodiment, the bonding regions are symmetrical, for example, bonding in a ring-like region, so that the stress is uniform and the occurrence of skew in the magnetic shield 60 is avoided.

The loudspeaker of the preferred embodiment of the utility model can be used in products with high requirements on magnetic interference, such as televisions, projectors and the like.

As shown in fig. 5, another preferred embodiment of the present utility model discloses a projector, which includes a speaker 100, a color wheel assembly 200 of a light engine, a sound cavity bottom shell 300, a light source 400 and a lens 500 in the preferred embodiment, wherein the color wheel assembly 200 of the light engine is used for generating the light source 400 and modulating the light beam, and then projecting the light beam onto a target projection surface such as a curtain through the lens 500; as shown in fig. 6, the color wheel assembly 200 includes a light source, a housing 210, a color wheel motor 220, a fluorescent sheet/diffusion sheet 230, wherein the light source, the color wheel motor 220 and the fluorescent sheet/diffusion sheet 230 are disposed in the housing, and a light beam generated by the light source can reach the fluorescent sheet/diffusion sheet 230, and the color wheel motor 220 is connected to and used for driving the fluorescent sheet/diffusion sheet 230 to rotate, wherein some devices that need to be driven by magnetic force, such as the fluorescent sheet/diffusion sheet 230 or the color wheel motor 220, are sensitive to magnetic field interference, and a slight magnetic field interference easily causes degradation of image quality of a projection image.

Compared with the prior art, the exposed magnetic field of the general loudspeaker is easy to interfere with the rotation of the color wheel motor 220 in the optical-mechanical color wheel assembly 200, and the distance D is generally set to be more than 20 mm. Because the loudspeaker provided in the above preferred embodiment can effectively shield the magnetic field from leaking, so that the loudspeaker 100 can be disposed at a position close to the optical engine color wheel assembly 200, in this embodiment, the side of the loudspeaker 100 provided with the magnetic shielding cover 60 faces the optical engine color wheel assembly 200, and the distance D between the magnetic steel 30 in the loudspeaker 100 and the color wheel motor 220 of the optical engine color wheel assembly 200 is within 20mm, thereby helping the projector to realize compact design with small size. More specifically, in some embodiments, a hall sensor is disposed in the color wheel motor 220, and the distance D is the minimum distance between the magnetic steel 30 and the hall sensor. In addition to the color wheel assembly, the horn 100 may be disposed in a position similar to other magnetic driving elements in the projector, such as a focusing motor and a spatial light modulator, and the distance between the magnetic steel 30 in the horn 100 and the focusing motor or the spatial light modulator is within 20 mm.

The background section of the present utility model may contain background information about the problem or environment of the present utility model rather than the prior art described by others. Accordingly, inclusion in the background section is not an admission of prior art by the applicant.

The foregoing is a further detailed description of the utility model in connection with specific/preferred embodiments, and it is not intended that the utility model be limited to such description. It will be apparent to those skilled in the art that several alternatives or modifications can be made to the described embodiments without departing from the spirit of the utility model, and these alternatives or modifications should be considered to be within the scope of the utility model. In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "preferred embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction. Although embodiments of the present utility model and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope as defined by the appended claims.

Claims (10)

1. The loudspeaker is characterized by comprising a support, a vibrating diaphragm, magnetic steel, a magnetic shield, a voice coil and a magnetic shield, wherein the vibrating diaphragm is arranged on the support, the voice coil is arranged on the vibrating diaphragm, the magnetic steel is at least partially arranged in the magnetic shield, and the magnetic steel and the magnetic shield are used for forming a magnetic field which interacts with current in the voice coil to enable the voice coil to move; the magnetic shielding cover is fixed on the magnetic cover or the bracket, the magnetic shielding cover is provided with a containing cavity, and the magnetic steel and the magnetic cover are integrally arranged in the containing cavity.

2. The horn of claim 1, wherein a vent is provided on the support, the vent being enclosed within the magnetic shield with a gap between the magnetic shield and the support, the vent communicating with the outside through the gap.

3. The horn of claim 1, further comprising a bumper; wherein the buffer is connected between the magnetic shield and the magnetic shield, and/or the buffer is connected between the magnetic shield and the bracket.

4. The horn of claim 1, further comprising a fastener, wherein an assembly hole is formed in a side of the magnetic shield facing away from the magnetic steel, a through hole is formed in a bottom of the accommodating chamber, and the fastener passes through the through hole and is fixed to the assembly hole to fix the magnetic shield to the magnetic shield, and the fastener is a magnetic shield.

5. The horn of claim 4, wherein the walls of the through holes extend toward the mounting holes, the fasteners abutting the walls.

6. The horn of claim 5, wherein a recess is provided in a side of the magnetic shield facing away from the magnetic steel, and a wall of the through hole is at least partially located in the recess.

7. The horn of claim 5, wherein the magnetic shield is abutted against the magnetic shield by an end of a wall of the through hole, the remaining structure of the magnetic shield being spaced from the magnetic shield and the bracket.

8. The loudspeaker of claim 1, wherein a groove is formed in one side of the magnetic shield, which faces away from the magnetic steel, an annular boss is formed at the bottom of the accommodating cavity, the annular boss extends into the groove, and the annular boss abuts against the groove through a buffer piece.

9. A projector comprising a housing and the horn of any one of claims 1 to 8, the horn being disposed within the housing.

10. The projector of claim 9, further comprising a bare engine color wheel assembly disposed within the housing, wherein a side of the horn on which the magnetic shield is disposed faces the bare engine color wheel assembly, and wherein a spacing between the magnetic steel and a color wheel motor in the bare engine color wheel assembly is within 20 mm.