Loudspeaker with illuminated diaphragm

Abstract

The present application relates to a loudspeaker comprising: a movable diaphragm; and a driving unit including a magnet, first and second pole pieces, the first pole piece including a through hole contacting the magnet on a first surface of the magnet, the second pole piece contacting the magnet on a second surface of the magnet, the first and second pole pieces being configured to generate a magnetic field in an air gap therebetween, the diaphragm being located in the air gap. The speaker includes a light source and a light guide configured to guide light emitted by the light source through the through hole in a direction of the primary sound emission direction to the movable diaphragm, the light guide including an elongated first section having a longitudinal axis parallel to the primary sound emission direction and a second section extending substantially perpendicular to the elongated first section, the light guide is configured to guide light through a first section to a second section in which the light is guided in the direction of the movable diaphragm, where the first section includes a first connection element and a second connection element to provide an interference fit between the light guide and the first pole piece.

Description

Technical Field

[0001] This application relates to a loudspeaker, and more specifically, to a loudspeaker configured to emit light. Background Technology

[0002] Audio loudspeakers (also known as megaphones, audio amplifiers, or simply loudspeakers) involve using a movable diaphragm driven by a voice coil to generate and emit sound waves. This technology is widely used in a variety of applications, including home entertainment systems, public address systems, and in-vehicle audio systems. However, with the increasing demand for visually appealing audio equipment, there is a growing need to integrate lighting into audio loudspeakers without compromising their performance or increasing their size.

[0003] Despite these challenges, various solutions have been proposed to address the need for illuminated audio speakers. One such solution involves using light guides to distribute light from a remote light source to the speaker, for example, to illuminate the diaphragm. However, this approach can introduce several problems. For instance, the light guide can be a source of rattling noise, which can negatively impact the overall acoustic performance of the speaker. Additionally, light guides increase the cost and complexity of assembling and disassembling the speaker. Furthermore, it is essential to ensure that the light source is located in a position that prevents it from being heated, as repeated heating of the light source used to illuminate the speaker reduces its lifespan.

[0004] Therefore, there is a need for a cost-effective way to use light guides in different magnet components, ensuring that acoustic performance is not negatively affected, no rattling noise is generated, and that operating the speaker does not affect the lifespan of the light source. The aim is to design an easy-to-install mounting option that does not limit the efficiency of the light guide or its ability to effectively mix colors, while also being sustainable and easy to disassemble, thereby at least partially overcoming the aforementioned problems. Summary of the Invention

[0005] The features of the independent claims satisfy this requirement. Dependent claims, however, describe other aspects.

[0006] One aspect of this disclosure relates to a loudspeaker configured to emit sound in a main sound emission direction, wherein the loudspeaker includes: a diaphragm; a driving unit including a magnet generating a magnetic field, a first pole piece and a second pole piece, the first pole piece including a through-hole and arranged to contact the magnet on a first surface of the magnet, and the second pole piece arranged to contact the magnet on a second surface of the magnet opposite to the first surface. The first and second pole pieces are configured to generate a magnetic field in an air gap between the first and second pole pieces, the diaphragm being located in the air gap. The loudspeaker also includes a light source configured to emit light. The loudspeaker includes a light guide configured to guide light emitted by the light source through the through-hole in the main sound emission direction to a movable diaphragm. The light guide includes an elongated first segment having a longitudinal axis parallel to the main sound emission direction, and includes a second segment extending substantially perpendicular to the elongated first segment, wherein the light guide is configured to guide light through the elongated first segment to the second segment, in which the light is guided in the direction of the movable diaphragm. The elongated first segment includes a first connecting element and a second connecting element to provide an interference fit between the light guide and the first electrode.

[0007] The advantage of this loudspeaker is that the light guide can be efficiently mounted to the first pole piece, and this interference fit is achieved only through the elongated first section and the first and second connecting elements connected to the first pole piece, without affecting the performance of the magnet and therefore the performance of the loudspeaker. No additional fixing devices such as screws or adhesives are used, thus allowing for easy assembly and disassembly, as well as precise positioning of the light guide relative to the drive unit (here, the first pole piece).

[0008] Furthermore, the light source is positioned within the speaker where it will not be heated by the heat generated by the voice coil. This is because the light guide helps increase the distance between the voice coil and the light source as it guides the light through the through-hole of the driver unit in the direction of the movable diaphragm. Therefore, the light source can be arranged on one side of the driver unit, and the voice coil, contained in the magnetic field, can be arranged on the other side of the driver unit.

[0009] It should be understood that, without departing from the scope of the invention, the above-described features, as well as those to be explained below, can be used not only in the indicated combinations, but also in other combinations or individually. Unless otherwise expressly stated, the features of the above aspects and the embodiments described below can be combined with each other in other embodiments. Attached Figure Description

[0010] Other devices, systems, methods, features, and advantages of the present invention will be or will become apparent to those skilled in the art after studying the following detailed description and accompanying drawings. Specifically, the features and effects of this application will become apparent from the following detailed description, which is read in conjunction with the accompanying drawings, in which the same reference numerals denote the same elements.

[0011] Figure 1 A schematic cross-sectional view of an audio speaker illuminated by a light source, incorporating features of the present invention, is shown.

[0012] Figures 2 to 4 yes Figure 1 A more detailed view of the different sections highlighted in the image.

[0013] Figure 5 It shows the use of Figure 1 A schematic exploded view of an audio speaker illuminated by a light source, as shown.

[0014] Figure 6 A schematic cross-sectional view of the light guide and the optical path within it is shown.

[0015] Figure 7 A schematic top view of the light guide is shown.

[0016] Figure 8 Showing cross Figure 7 The cross-sectional view of the light guide AA shown, and further details of the connecting element at the light guide for obtaining an interference fit with one of the electrodes.

[0017] Figure 9 Another schematic cross-sectional view of an audio speaker illuminated by a light source, incorporating features of the present invention, is shown. Detailed Implementation

[0018] In the following description, embodiments of the invention will be described in detail with reference to the accompanying drawings. It should be understood that the following description of the embodiments should not be considered limiting. The scope of the invention is not intended to be limited by the embodiments or drawings described below, which are for illustrative purposes only.

[0019] The accompanying drawings should be considered schematic representations, and the elements shown in the drawings are not necessarily shown to scale. Rather, the individual elements are represented in such a manner that their function and overall purpose will be apparent to those skilled in the art. Any connections or couplings between functional blocks, devices, or components of the physical or functional units shown in the drawings and described below may also be implemented through indirect connections or couplings.

[0020] In this context, the term "audio loudspeaker" should be interpreted as meaning a device capable of generating and emitting sound waves by actuating a movable diaphragm in the main sound emission direction. Therefore, an audio loudspeaker according to this disclosure includes a movable diaphragm and a driver, such as a voice coil, arranged to actuate the movable diaphragm. During operation of the audio loudspeaker, the voice coil receives an appropriate input signal and operates in response to the received input signal, causing the voice coil to move or vibrate the movable diaphragm, thereby generating sound waves according to the input signal.

[0021] refer to Figure 1 An audio loudspeaker 100 is shown, comprising a driver unit 105, a diaphragm 150, and a protective cap 158 (also referred to as a dust cap) connected to the diaphragm 150. The driver unit 105 includes a magnet 110, a first pole piece 120, and a second pole piece 130. The magnetic field generated by the magnet is aligned in an air gap 161 via the pole pieces 120 and 130, thereby generating a substantially uniform magnetic field in the air gap 161. A voice coil 165 is arranged in the air gap such that when a changing current is applied to the winding of the voice coil 165, the change in the changing magnetic field induced by the voice coil causes the voice coil to... Figure 1 The main sound emission direction 60 shown is moved in an axial direction parallel to the direction of sound emission. The voice coil 165 is connected to the movable diaphragm 150 by a support 160, such that the diaphragm is arranged to move together with the voice coil to generate and emit sound waves from the loudspeaker 100, wherein the sound waves or sound... Figure 1 The sound is emitted in the main sound emission direction 60. The main sound emission direction is therefore parallel to the central axis 50 of the speaker and points away from the speaker 100. The movement of the voice coil is guided by the spider 140. The diaphragm 150 is also connected to the frame 155 of the speaker 100. In the illustrated embodiment, the speaker is a midrange speaker that emits sound waves in the frequency range between approximately 200 Hz and approximately 5000 Hz. However, it should be understood that the techniques discussed above and below can also be applied to any other frequency range, whether as combined later. Figure 9 Is it a woofer or a tweeter?

[0022] The loudspeaker also includes a circuit board 180, which includes at least one light source 185. The circuit board 180 is connected to one of the pole pieces (here, the first pole piece 120), wherein a fixing element 190 may be implemented as tape or any other element through which the circuit board can be attached to the underside of the drive unit 105. A closing element 170, such as a bracket, forms an end face at the underside of the loudspeaker 100. In this context, the lower surface or lower side and the upper surface or inner side are considered relative to the sound emission direction 60, wherein the upper side or front side is the side of the loudspeaker 100 visible to the user, and wherein sound waves are emitted in the direction of the main sound emission direction, wherein the lower side is the opposite or rear side of the loudspeaker 100. Light generated by the light source 185 is guided through a light guide 200, and the light exits the light guide at a light outlet 205.

[0023] Also refer to Figure 2 and Figure 4 The light emitted by the light source 185 enters the light guide 200 through the light receiving surface 204 and is guided through the light guide 200 substantially parallel to the main sound emission direction, and then deviates to leave the light guide at the light exit 205.

[0024] Special Reference Figure 4 Light exiting the light guide at the exit surface passes through the transparent side surface 157 of the cap 158, while the remainder of the cap is covered by an opaque material 159. The cap moves with the diaphragm relative to the light guide and therefore relative to the light exit 205. As the transparent side surface 157 moves relative to the light guide, it defines an opening window that provides a portion of the transparent side surface through which light emitted from the light guide can directly reach the front surface 152 of the diaphragm 150. The size of this opening window changes with the movement of the diaphragm and also depends on the position of the lower edge of the opaque material 159 relative to the light exit 205. Furthermore, as... Figure 4 As can be seen, when the diaphragm 150 and the cap 158 move, air can move freely from the top of the light guide to the bottom of the light guide.

[0025] In this context, the term "light source" should be interpreted as meaning a device configured to generate light (i.e., electromagnetic waves) preferably within the wavelength range visible to the human eye. However, it is not excluded that a light source can generate light outside the visible light range, such as infrared (IR) or ultraviolet (UV) light. A light source can be or includes one or more light-emitting diodes (LEDs), lasers, laser-excited remote phosphor (LARP) light sources, or any other suitable type of light source. The light source may include a combination of white LEDs and colored LEDs, such as RGB LEDs (red, green, and blue LEDs) or white LEDs, and the light guide also operates as a color mixer, wherein the different colors of light emitted by different LEDs are mixed before they leave the light guide.

[0026] In this context, light guide 200 should be interpreted as a component or element configured to guide light from one location to another. A light guide may or can include a waveguide, an optical fiber with a core and cladding, one or more reflective elements, and / or any other suitable optical element. By way of example, light guide 200 may be made of plastic materials such as PMMA, PMMI, or polycarbonate PC.

[0027] like Figure 1 As shown, the light guide 200 is arranged to guide light emitted from the light source 185 to the front surface 152 of the diaphragm 150, and the light source 185 is positioned at a certain distance from the diaphragm. The light guide interconnects the light source 185 and the front surface 152 of the diaphragm 150.

[0028] refer to Figure 6 The light guide 200 is explained in more detail. The light guide includes an elongated first segment 220 having a longitudinal axis parallel to the main sound emission direction 60 and parallel to the main axis of the speaker 100. Furthermore, the light guide includes a second segment 230 in which light is reflected toward the light exit 205. The second segment 230 includes a prism 235 provided to change the direction of the light path from substantially parallel to the main sound emission direction to perpendicular to the main sound emission direction or the intermediate axis 50. The prism 235 has a reflective surface configured to achieve the redirection of the light path. The entire light guide may be made of a light-transparent material but has internal reflective surfaces, such that total internal reflection (TIR) ​​is generated in the light guide. All side surfaces may be implemented as reflective surfaces that reflect light arriving at the surface at an angle less than a defined angle (such as 20 to 30 degrees). This helps ensure that the majority of the light guided through the light guide exits the light guide at the light exit 205.

[0029] The elongated first segment 220 includes an entrance portion 240, followed by a connecting portion through which the light guide is connected to the drive unit (specifically, as shown here). Figure 1 (The first electrode 120 is shown). After the connecting portion 250, the elongated first section 220 includes another portion 260, which is followed by a second section 230 of the light guide, in which light is reflected in the direction of the light outlet 205.

[0030] refer to Figure 2 , Figure 3 , Figure 6 and Figure 8The connecting portion 250 has a cylindrical shape with a constant diameter in a direction perpendicular to the main axis. The connecting portion includes a first connecting element, which is implemented as a first protrusion 251 projecting from the outer surface of the connecting portion 250 perpendicular to the longitudinal axis of the connecting portion. The first protrusion provides a support structure for the edge of a through-hole 125 disposed in the first electrode 120. The through-hole 125 includes a receiving portion 126 having a cylindrical shape with a constant diameter. The outer diameter of the protrusion of the first connecting element 251 is larger than the inner diameter of the receiving portion 126. The through-hole 125 also includes a V-shaped portion 127 at its lower end facing the light source 185, which opens in the direction of the light source 185. The protrusion 251 may abut against the edge of the through-hole 125 at the transition between the V-shaped portion 127 and the receiving portion 126. The light guide also includes a second protrusion 252 that abuts against the leading edge of the through-hole 125, where the receiving portion 126 ends and another V-shaped portion 128 of the through-hole begins. The light guide 200 can be inserted through the V-shaped portion 128 and pressed through the receiving portion until the first protrusion is located at the edge or transition between the receiving portion and the V-shaped portion 127. Generally, an edge can be understood as a boundary or division between two surfaces. In this context, an edge refers to the transition point where the conical shape meets the cylindrical portion of the receiving portion. An interference fit can be understood as a tight fit between two parts, one of which is slightly larger than the other, requiring some force to assemble and disassemble.

[0031] An interference fit is achieved by the first protrusion 251 of the light guide 200 cooperating with one end of the receiving portion of the through hole and thus with a portion of the first electrode 120. Furthermore, an interference fit is achieved by the second protrusion 252 cooperating with the upper edge of the receiving portion of the through hole. Therefore, the first and second protrusions are the only elements providing the interference fit between the light guide 200 and the first electrode 120 (specifically, the through hole disposed in the electrode).

[0032] Figure 7 This is a top view of the Fiber Optic 200, and Figure 8 It is across Figure 7 A cross-sectional view of line AA. Figure 8Details C and B, showing protrusions 251 and 252 in more detail, are also shown. The second protrusion 252 is formed by the transition between connecting portion 250 and another portion 260. In the following, as an example, it is assumed that the diameter of the through-hole 125 of the magnet at the receiving portion 126 is 4.1 mm. It should be understood that this distance is merely an example, and other sizes with similar relationships to each other can be used in larger or smaller applications. The following example is an illustrative example showing the dimensional relationship between the through-hole, the connecting portion of the light guide, and the protrusion. The diameter of the connecting portion can be 4.06 mm, which is therefore smaller than the diameter of the through-hole (4.1 mm), wherein the second protrusion 252 has a significantly larger diameter than the diameter of the through-hole, such as... Figure 8 As shown in detail c. The first protrusion 251 extends radially, for example, 0.13 mm. The length of each of the first protrusions 251 in the longitudinal direction can be in the range of 0.5 mm to 3 mm, for example, 1 mm. The diameter below the first protrusion 251 can be 4.2 mm, which is larger than the 4.06 mm of the connecting portion and also larger than the diameter of the through hole. The light guide 200 can be inserted into the through hole from the front, wherein the entrance portion 240 is pushed through the through hole 125 until the first protrusion 251 abuts against the lower edge of the electrode 120. The second protrusion 252 is positioned such that it abuts against the transition between the receiving portion 126 and the V-shaped portion 128 of the through hole.

[0033] The first and second protrusions can be integrally formed with the light guide and are therefore made of the same material, such as PMMA, PMMI, or PC. The dimensions of the protrusion 251 can be set such that the protrusion can deform without being damaged when the light guide is inserted into the through-hole.

[0034] Therefore, either a press fit or an interference fit can be achieved. Specifically, the interference fit provided by protrusions 251 and 252 can be a press fit that can be assembled using cold pressing. This allows for reliable and secure fixation and precise positioning of the light guide 200 within the through-hole, avoiding rattling noises and not limiting the light guide's full potential or its ability to effectively mix colors. Furthermore, the design is sustainable and can be easily disassembled without damaging the materials of the light guide or drive unit.

[0035] The arrangement of the different components of the loudspeaker can also be seen from... Figure 5 This is derived from the exploded view shown. In this exploded view, a protective cap 158 is shown, followed by a diaphragm 150, and then a spider 140 that guides the movement of the diaphragm 150. Also shown are a voice coil 165, a light guide 200, and a drive unit including pole pieces 130, a magnet 110, and pole pieces 120. A circuit board 180 is connected to pole piece 120 using a connecting element 190, which can be implemented as double-sided tape, and a bracket 170 closes the speaker from the rear.

[0036] Figure 9 This shows a combination similar to the one above. Figures 1 to 5 Another embodiment of the loudspeaker 300 of the loudspeaker 100 under discussion. The loudspeaker 300 is a woofer configured to emit sound waves in a frequency range such as between 20 Hz and 2000 Hz. The loudspeaker includes a drive unit having a first pole piece 320, a second pole piece 330, and a magnet 310. A diaphragm 350 is connected to a voice coil 360 via a support 365 and its movement is guided by a spider 340. Additionally, a cap 500 is provided. A light guide 400 with a light outlet 405 is provided, and this light guide may correspond to light guide 200, but other sizes may be used for light guide 400. The light guide 400 is configured to be combined with... Figures 1 to 8 The same manner discussed is used to connect to the first electrode to achieve an interference fit between the light guide and the first electrode 320. However, larger gaps can be provided between the drive unit and the spider, and between the upper surface of the light guide 400 and the cap 500, to allow for greater offset of the diaphragm 350 relative to the drive unit, ensuring that the movement of the diaphragm is unaffected by the presence of the light guide. Figures 1 to 8 Compared to the illustrated embodiment, the gap between the drive unit and the spider 340 is larger, thereby allowing for greater diaphragm offset. The gap between the drive unit and the spider can be in the range of 14 mm to 20 mm, preferably in the range of 16 mm to 17 mm. Similarly, when the cap moves together with the diaphragm 350, the gap between the light guide and the cap 500 is larger. This gap can be in the same range, i.e., between 14 mm and 20 mm, preferably between 17 mm and 18 mm, and is therefore slightly larger than the gap between the drive unit and the spider.

[0037] Various aspects of the present invention may be described by the following terms:

[0038] 1. A loudspeaker configured to emit sound in a main sound emission direction, the loudspeaker comprising: a movable diaphragm; a driving unit including a magnet for generating a magnetic field, a first pole piece, and a second pole piece, the first pole piece including a through hole disposed on a first surface of the magnet to contact the magnet, the second pole piece being disposed on a second surface of the magnet opposite to the first surface to contact the magnet, wherein the first pole piece and the second pole piece are configured to generate a magnetic field in an air gap between the first pole piece and the second pole piece, the diaphragm being located in the air gap. The loudspeaker includes a light source and a light guide. The light source is configured to emit light, and the light guide is configured to guide the light emitted by the light source through the through-hole to the movable diaphragm in the direction of the main sound emission direction. The light guide includes an elongated first segment having a longitudinal axis parallel to the main sound emission direction and a second segment extending substantially perpendicular to the elongated first segment. The light guide is configured to guide the light through the elongated first segment to the second segment, in which the light is guided in the direction of the movable diaphragm. The elongated first segment includes a first connecting element and a second connecting element to provide an interference fit between the light guide and the first electrode.

[0039] 2. The loudspeaker as described in Clause 1, wherein the through-hole includes a receiving portion extending in a direction parallel to the main sound emission direction hole, wherein the receiving portion includes a first end cooperating with the first connecting element and a second end cooperating with the second connecting element in the direction of the main sound emission direction.

[0040] 3. The loudspeaker as described in Clause 2, wherein the diameter of the receiving portion in the direction perpendicular to the longitudinal axis is substantially constant.

[0041] 4. The loudspeaker as described in any of the preceding clauses, wherein the elongated first segment of the light guide includes an inlet portion, a connecting portion, and another portion along the main sound emission direction, the inlet portion being configured to receive light emitted by the light source, the connecting portion including a first connecting element and a second connecting element, and the elongated first segment being connected to the second segment via the other portion.

[0042] 5. The loudspeaker as described in Clause 4, wherein the outlet portion has a trapezoidal shape, wherein the diameter of the elongated first segment perpendicular to the main sound emission direction increases toward the second segment.

[0043] 6. The loudspeaker as described in Clause 4 or 5, wherein the connecting portion has a substantially cylindrical shape having a cylindrical axis parallel to the main sound emission direction.

[0044] 7. The loudspeaker as described in any of the preceding clauses, wherein the first connecting element includes a protrusion extending from the elongated first segment in a direction perpendicular to the longitudinal axis and cooperating with a first end of the through-hole, and the second connecting element includes a second protrusion extending from the light guide in a direction perpendicular to the longitudinal axis and cooperating with a second end of the through-hole.

[0045] 8. The loudspeaker of any one of clauses 2 to 7, wherein the first pole piece is formed such that at the through-hole, it includes a first tapered portion along the main sound emission direction, followed by the connecting portion, and then a second tapered portion, wherein the diameter of the first tapered portion increases in a direction opposite to the main sound emission direction, and the diameter of the second tapered portion increases in the direction of the main sound emission direction.

[0046] 9. The loudspeaker of any one of Clauses 4 to 8, wherein the connecting portion has a cylindrical shape, and wherein the longitudinal axis of the connecting portion extends parallel to the main sound emission direction.

[0047] 10. The loudspeaker as described in any of the preceding clauses further includes a cap connected to the diaphragm, wherein the light guide is designed to guide the light emitted by the light source to the cap.

[0048] 11. The loudspeaker as described in any of the preceding clauses, wherein the second segment of the light guide is designed such that it does not include any connection to the drive unit.

[0049] 12. The loudspeaker as described in any of the preceding clauses, wherein the magnet is a ferrite magnet.

[0050] 13. The loudspeaker as described in any of the preceding clauses further includes: a circuit board, and the light source is connected to the circuit board; a fixing element disposed at the first electrode, the fixing element fixing the circuit board to the first electrode.

[0051] In summary, the audio speaker 100 discussed above provides an efficient means of illuminating the front surface of the diaphragm 150. Furthermore, a compact size is achieved, and in particular, efficient connection of the light guide 200 to other components of the speaker is realized. The speaker is also capable of withstanding demanding automotive requirements.

Claims

1. A loudspeaker (100, 300) configured to emit sound in a main sound emission direction, the loudspeaker comprising: - Movable diaphragm (150, 350); - A drive unit, the drive unit comprising: - A magnet that generates a magnetic field. - A first pole piece, the first pole piece including a through hole arranged to contact the magnet on a first surface of the magnet. - A second pole piece, the second pole piece being arranged to contact the magnet on a second surface of the magnet opposite to the first surface, wherein the first pole piece and the second pole piece are configured to generate a magnetic field in an air gap between the first pole piece and the second pole piece, and the diaphragm is located in the air gap; - A light source configured to emit light; - A light guide configured to guide light emitted by the light source through the through-hole to the movable diaphragm in the direction of the main sound emission direction, the light guide including an elongated first segment having a longitudinal axis parallel to the main sound emission direction and a second segment extending substantially perpendicular to the elongated first segment, the light guide being configured to guide the light through the elongated first segment to the second segment, in which the light is guided in the direction of the movable diaphragm, wherein the elongated first segment includes a first connecting element and a second connecting element to provide an interference fit between the light guide and the first electrode.

2. The loudspeaker of claim 1, wherein the through-hole includes a receiving portion extending in a direction parallel to the main sound emission direction hole, wherein the receiving portion includes a first end cooperating with the first connecting element and a second end cooperating with the second connecting element in the direction of the main sound emission direction.

3. The loudspeaker of claim 2, wherein the diameter of the receiving portion in the direction perpendicular to the longitudinal axis is substantially constant.

4. The loudspeaker of any of the preceding claims, wherein the elongated first segment of the light guide includes an inlet portion, a connecting portion, and another portion along the main sound emission direction, the inlet portion being configured to receive light emitted by the light source, the connecting portion including a first connecting element and a second connecting element, and the elongated first segment being connected to the second segment via the other portion.

5. The loudspeaker of claim 4, wherein the outlet portion has a trapezoidal shape, wherein the diameter of the elongated first segment perpendicular to the main sound emission direction increases toward the second segment.

6. The loudspeaker of claim 4 or 5, wherein the connecting portion has a substantially cylindrical shape, the substantially cylindrical shape having a cylindrical axis parallel to the main sound emission direction.

7. The loudspeaker of any of the preceding claims, wherein the first connecting element includes a protrusion extending from the elongated first segment in a direction perpendicular to the longitudinal axis and cooperating with a first end of the through-hole, and the second connecting element includes a second protrusion extending from the light guide in a direction perpendicular to the longitudinal axis and cooperating with a second end of the through-hole.

8. The loudspeaker of any one of claims 2 to 7, wherein the first pole piece is formed such that at the through-hole, it includes a first tapered portion along the main sound emission direction, followed by the connecting portion, and then a second tapered portion, wherein the diameter of the first tapered portion increases in a direction opposite to the main sound emission direction, and the diameter of the second tapered portion increases in the direction of the main sound emission direction.

9. The loudspeaker as claimed in any one of claims 4 to 8, wherein the connecting portion has a cylindrical shape, and wherein the longitudinal axis of the connecting portion extends parallel to the main sound emission direction.

10. The loudspeaker of any of the preceding claims, further comprising a cap connected to the diaphragm, wherein the light guide is configured to guide the light emitted by the light source to the cap.

11. The loudspeaker as claimed in any of the preceding claims, wherein the second segment of the light guide is designed such that it does not include any connection to the drive unit.

12. The loudspeaker as claimed in any of the preceding claims, wherein the magnet is a ferrite magnet.

13. The loudspeaker as claimed in any of the preceding claims, further comprising: - A circuit board, and the light source is connected to the circuit board; - A fixing element disposed at the first electrode, the fixing element fixingly connecting the circuit board to the first electrode.

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