Speaker with an illuminated diaphragm

Abstract

This provides a cost-effective method for using light guides in different magnetic assemblies of speakers with illuminated diaphragms. [Solution] The audio speaker 100 comprises a diaphragm 150 and a drive unit 105. The drive unit 105 comprises a magnet 110 and a first pole piece 120 and a second pole piece 130 having a through hole 125, the first pole piece 120 and the second pole piece 130 generating a magnetic field in the air gap 161 between the first pole piece 120 and the second pole piece 130 on which the diaphragm 150 is positioned. The audio speaker 100 further includes a light source 185 configured to emit light and a light guide 200 that guides the light emitted by the light source 185 through the through hole 125 to the diaphragm 150 in the direction of the main sound emission direction.

Description

Technical Field

[0001] This application relates to a speaker, and more particularly to a speaker configured to emit light.

Background Art

[0002] An audio speaker (also called a loudspeaker, an audio loudspeaker, or simply a speaker) may include generating and emitting acoustic sound waves using a movable diaphragm driven by a voice coil. This technology is widely adopted in various applications such as home entertainment systems, public address systems, and vehicle audio systems. However, as the demand for visually appealing audio devices increases, there is a growing need to integrate lighting into audio speakers 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 a light guide to distribute light from a remote light source to the speaker, for example, illuminating the diaphragm. However, several problems may occur with this approach. For example, the light guide may be a source of rattling noise and may negatively affect the overall acoustic performance of the speaker. In addition, the light guide may increase the cost and complexity of speaker assembly and disassembly. Furthermore, since repeatedly heating the light source used to illuminate the speaker shortens the life of the light source, it is necessary to place the light source at a position where heating of the light source is necessarily avoided.

[0004] Therefore, it is necessary to provide a cost-effective method for using light guides in different magnetic assemblies, ensuring that acoustic performance is not negatively affected, rattling noises do not occur, and the lifespan of the light source is not affected by speaker operation. The goal is to design an easy-to-install mounting option that at least partially overcomes the above problems by being sustainable and easily disassemblable, without limiting the efficiency or ability of the light guide to effectively mix colors. [Overview of the project] [Means for solving the problem]

[0005] This need is met by the features of the independent patent claim. Further aspects are described in the dependent claims.

[0006] One aspect of the present disclosure relates to a speaker configured to emit sound in a principal sound emission direction, the speaker comprising a diaphragm, a drive unit including a magnet for generating a magnetic field, a first pole piece having a through hole positioned to contact a magnet on a first surface of the magnet, and a second pole piece positioned to contact a magnet on a second surface of the magnet opposite the first surface. The first and second pole pieces are configured to generate a magnetic field in the gap between the first and second pole pieces on which the diaphragm is positioned. The speaker further comprises a light source configured to emit light. The speaker includes a light guide configured to guide light emitted by the light source through a through hole to a movable diaphragm in the principal sound emission direction. The light guide comprises an elongated first section having a longitudinal axis parallel to the principal sound emission direction, and a second section extending substantially perpendicular to the elongated first section, the light guide being configured to guide light through the elongated first section to the second section, where the light is guided toward the movable diaphragm. The elongated first section comprises a first connecting element and a second connecting element that provide an interference fit between the light guide and the first pole piece.

[0007] The speaker's effect is that the light guide can be attached to the first pole piece in an effective manner, and this interlocking fit is achieved solely by the elongated first section, the first connecting element, and the second connecting element connecting to the first pole piece, without affecting the performance of the magnet and, consequently, the performance of the speaker. The absence of additional fastening means such as screws or adhesives makes assembly and disassembly easy and allows for precise positioning of the drive unit, in this case the light guide, relative to the first pole piece.

[0008] Furthermore, the light source is positioned within the speaker where it is not heated by the heat generated by the voice coil, as the light guide helps increase the distance between the voice coil and the light source when the light guide directs light towards the movable diaphragm through the through-hole in the drive unit. Thus, it is possible to place the light source on one side of the drive unit and the coil, which is contained within the magnetic field, on the other side of the drive unit.

[0009] It should be understood that the features described above and those described below can be used not only in the given combinations, but also in other combinations or individually without departing from the scope of the present invention. The features of the above embodiments and the embodiments described below may be combined with each other in other embodiments unless otherwise explicitly stated. The present invention provides, for example, the following items: (Item 1) A speaker (100, 300) configured to emit sound in the direction of the main sound emission, -Movable diaphragm (150, 350), - A drive unit - A magnet that generates a magnetic field, - A first pole piece having a through hole positioned on the first surface of the magnet so as to contact the magnet, - comprising a second pole piece positioned to contact the magnet on the second surface of the magnet opposite to the first surface, wherein the first and second pole pieces are configured to generate a magnetic field in the gap between the first and second pole pieces on which the diaphragm is positioned, The aforementioned drive unit, - 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 principal sound emission direction, the light guide comprising an elongated first section having a longitudinal axis parallel to the principal sound emission direction, and a second section extending substantially perpendicular to the elongated first section, the light guide configured to guide the light through the elongated first section to the second section, which guides the light in the direction of the movable diaphragm, the elongated first section comprising a first connecting element and a second connecting element to provide an interference fit between the light guide and the first pole piece, The aforementioned speakers (100, 300). (Item 2) The speaker according to the above item, wherein the through hole comprises a receiving portion extending in a direction parallel to the main sound emission direction hole, and the receiving portion comprises a first end that cooperates with the first connecting element for interference fitting in the direction of the main sound emission direction, and a second end that cooperates with the second connecting element. (Item 3) The speaker according to any one of the above items, wherein the diameter of the receiving portion is substantially constant in a direction perpendicular to the longitudinal axis. (Item 4) The speaker according to any one of the above items, wherein the elongated first section of the light guide comprises an inlet portion configured to receive the light emitted by the light source, following the direction of the principal sound emission; a connecting portion comprising a first connecting element and a second connecting element; and a further portion by which the elongated first section is connected to the second section. (Item 5) The speaker according to any one of the above items, wherein the outlet portion has a trapezoidal shape in which the diameter of the elongated first section perpendicular to the direction of principal sound emission increases toward the second section. (Item 6) The speaker according to any one of the above items, wherein the connecting portion has a substantially cylindrical shape and the cylindrical axis is parallel to the direction of principal sound emission. (Item 7) The speaker according to any one of the above items, wherein the first connecting element has a projection that extends perpendicularly from the elongated first section perpendicular to the longitudinal axis and cooperates with the first end of the through hole, and the second connecting element has a second projection that extends perpendicularly from the light guide perpendicular to the longitudinal axis and cooperates with the second end of the through hole. (Item 8) The speaker according to any one of the above items, wherein the first pole piece is formed in the through hole to include, following the direction of principal sound emission, a first conical portion, a connecting portion thereafter, and a second conical portion thereafter, wherein the diameter of the first conical portion increases in the direction opposite to the direction of principal sound emission, and the diameter of the second conical portion increases in the direction of principal sound emission. (Item 9) The speaker according to any one of the above items, wherein the connecting portion has a cylindrical shape, and the longitudinal axis of the connecting portion extends parallel to the direction of principal sound emission. (Item 10) The speaker according to any one of the above items, further comprising a cap connected to the diaphragm, wherein the light guide is designed to guide the light emitted by the light source to the cap. (Item 11) The speaker according to any one of the above items, wherein the second section of the light guide is designed not to include any connections to the drive unit. (Item 12) The speaker described in any one of the above items, wherein the magnet is a ferrite magnet. (Item 13) - A circuit board, wherein the circuit board to which the light source is connected, - A fixing element provided on the first pole piece, the fixing element which fixes and connects the circuit board to the first pole piece, A speaker as described in any one of the above items, further comprising the features described above. (Summary) This application relates to a speaker configured to emit sound in the direction of principal sound emission, comprising: a movable diaphragm; a drive unit comprising: a magnet for generating a magnetic field; a first pole piece having a through hole arranged to contact the magnet on a first surface of the magnet; and a second pole piece arranged to contact the magnet on a second surface of the magnet opposite the first surface, wherein the first and second pole pieces are configured to generate a magnetic field in the air gap between the first and second pole pieces on which the diaphragm is positioned. The speaker includes a light source configured to emit light, and a light guide configured to guide the light emitted by the light source through a through-hole to a movable diaphragm in the direction of principal sound emission, the light guide comprising an elongated first section having a longitudinal axis parallel to the direction of principal sound emission, and a second section extending substantially perpendicular to the elongated first section, the light guide configured to guide light through the elongated first section to the second section, which guides the light toward the movable diaphragm, the elongated first section comprising a first connection element and a second connection element to provide an interference fit between the light guide and a first pole piece.

[0010] By examining the embodiments and drawings for carrying out the invention described below, other devices, systems, methods, features, and advantages of the present invention will be apparent or will become apparent to those skilled in the art. Specifically, the features and effects of this application will become apparent by reading the embodiments for carrying out the invention described below in conjunction with the accompanying drawings, in which similar reference numerals refer to similar elements. [Brief explanation of the drawing]

[0011] [Figure 1]A schematic cross-sectional view of an audio speaker illuminated by a light source incorporating the features of the present invention is shown. [Figure 2] It is a more detailed view of different sections highlighted in FIG. 1. [Figure 3] It is a more detailed view of different sections highlighted in FIG. 1. [Figure 4] It is a more detailed view of different sections highlighted in FIG. 1. [Figure 5] A schematic exploded view of an audio speaker illuminated by the light source shown in FIG. 1 is shown. [Figure 6] A schematic cross-sectional view of a light guide and the optical path within the light guide is shown. [Figure 7] A schematic top view of the light guide is shown. [Figure 8] A cross-sectional view of the light guide taken along section A-A shown in FIG. 7 and further details of the connection elements in the light guide used to obtain an interference fit with one of the pole pieces are shown. [Figure 9] Another schematic cross-sectional view of an audio speaker illuminated by a light source incorporating the features of the present invention is shown.

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present 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 construed in a limiting sense. The scope of the present invention is not intended to be limited to the embodiments or drawings described below, and the embodiments or drawings are for illustrative purposes only.

[0013] The drawings should be regarded as schematic representations, and the elements shown in the drawings are not necessarily shown to scale. Rather, the various elements are represented so that their functions and general purposes are apparent to those skilled in the art. Any connection or coupling between the functional blocks, devices, components of the physical units or functional units shown in the drawings and described below may also be implemented by an indirect connection or coupling.

[0014] In this specification, the term "audio speaker" should be interpreted as meaning a device capable of generating and emitting acoustic waves by operating a movable diaphragm in the direction of principal sound emission. Thus, the audio speaker according to this disclosure comprises a movable diaphragm and a drive, such as a voice coil, arranged to actuate the movable diaphragm. During operation of the audio speaker, the voice coil receives a suitable input signal and operates to generate acoustic waves according to the input signal by moving or vibrating the movable diaphragm in response to the received input signal.

[0015] Referring to Figure 1, an audio speaker 100 is shown, which includes a drive unit 105, a diaphragm 150, and a protective cap 158 (also called a dust cap) connected to the diaphragm 150. The drive unit 105 comprises a magnet 110, a first pole piece 120, and a second pole piece 130. The magnetic field generated by the magnet is aligned through the pole pieces 120 and 130 in the air gap 161, generating a substantially homogeneous magnetic field in the air gap 161. When a fluctuating current is applied to the windings of the voice coil 165, the voice coil is positioned in the air gap such that it moves axially, parallel to the principal sound emission direction 60 shown in Figure 1, due to the changing magnetic field induced by the voice coil. The voice coil 165 is connected to the movable diaphragm 150 using a support 160, so that the diaphragm moves with the voice coil to generate and emit acoustic waves from the speaker 100, and the elastic waves or sound are emitted in the principal sound emission direction 60 in Figure 1. Thus, the principal sound emission direction is parallel to the central axis 50 of the speaker and directed away from the loudspeaker 100. The movement of the voice coil is guided by the spider 140. The diaphragm 150 is further connected to the frame 155 of the speaker 100. In the illustrated embodiment, the speaker is a mid-range speaker emitting sound waves in the frequency range of about 200 to about 5000 Hz. However, of course, the techniques discussed above and below can be applied to any other frequency range, which may be a woofer or tweeter, as will be described later in relation to Figure 9.

[0016] The speaker further comprises a circuit board 180 having at least one light source 185. The circuit board 180 is connected to one of the pole pieces, in this specification the first pole piece 120, and a fixing element 190 which can be implemented as tape or any other element, thereby allowing the circuit board to be mounted on the underside of the drive unit 105. A closing element 170, such as a bracket, forms an end face on the underside of the speaker 100. In this context, the bottom or side and the internal top are considered with respect to the sound emission direction 60, the top or front is the side of the speaker 100 visible to the user, where sound waves are emitted in the direction of the principal sound emission direction, and the bottom is the opposite or rear side of the speaker 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.

[0017] See also Figures 2 and 4, the light emitted by the light source 185 passes through the light-receiving surface 204 and enters the light guide 200, and is guided substantially parallel to the direction of principal sound emission before being deflected through the light guide 200 to exit the light guide at the light outlet 205.

[0018] Referring particularly to Figure 4, light exiting the light guide at the exit surface passes through the transparent side 157 of the cap 158, while the rest of the cap is covered with opaque material 159. The cap moves with the diaphragm relative to the light guide and therefore to the light exit 205. As the transparent side 157 moves relative to the light guide, an opening window is defined, through which light emitted from the light guide can directly strike the front surface 152 of the diaphragm 150 by passing through the portion of the transparent side provided. 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 position of the light exit 205. Furthermore, as seen in Figure 4, air can move freely from the top of the light guide to the bottom of the light guide as the diaphragm 150 and cap 158 move.

[0019] In this specification, the term "light source" should be interpreted as meaning a device configured to produce light, i.e., electromagnetic waves, preferably within the wavelength range visible to the human eye. However, it is not excluded that a light source may produce electromagnetic waves of wavelengths outside the visible range, such as infrared (IR) or ultraviolet (UV). A light source may be, or include, one or more light-emitting diodes (LEDs), lasers, laser-activated remote phosphor (LARP) light sources, or any other suitable type of light source. A light source may include a combination of white and color LEDs, such as RGB LEDs, red, green, and blue LEDs, or white LEDs, and the light guide may also act as a color mixer of light, where different colors of light emitted by different LEDs are mixed before leaving the light guide.

[0020] In this specification, the light guide 200 should be interpreted as meaning a component or element configured to guide light from one position to another. The light guide may be, or may include, a waveguide, an optical fiber having a core and cladding layer, one or more reflective elements, and / or any other suitable optical element. For example, the light guide 200 may be made of a plastic material such as PMMA, PMMI, or polycarbonate PC.

[0021] As shown in Figure 1, the light guide 200 is positioned to guide the light emitted from the light source 185 to the front surface 152 of the diaphragm 150, while the light source 185 is positioned away from the diaphragm. The light guide interconnects the light source 185 and the front surface 152 of the diaphragm 150.

[0022] Referring to Figure 6, the light guide 200 will be described in more detail. The light guide includes an elongated first section 220, whose longitudinal axis is parallel to the principal sound emission direction 60 and parallel to the principal axis of the speaker 100. Furthermore, the light guide includes a second section 230 to which light is reflected toward the light outlet 205. The second section 230 includes a prism 235, which is provided to change the direction of the optical path from a direction substantially parallel to the principal sound emission direction to a direction perpendicular to the principal sound emission direction or the central axis 50. The prism 235 has a reflective surface configured to redirect the optical path. The entire light guide may be made of a translucent material but has internal reflective surfaces so that total internal reflection (TIR) ​​occurs within the light guide. All sides may be implemented as reflective surfaces that reflect light striking the surface at angles smaller than a given angle, such as 20° to 30°. This ensures that most of the light guided through the light guide exits the light guide at the light exit 205.

[0023] The elongated first section 220 comprises an inlet portion 240 and a connecting portion thereafter to which the light guide is connected to the drive unit, and in particular here comprising a first pole piece 120 as shown in Figure 1. Following the connecting portion 250, the elongated first section 220 comprises a further portion 260 and thereafter a second section 230 of the light guide to which light is reflected, so that the light is reflected in the direction of the light outlet 205.

[0024] Referring to Figures 2, 3, 6, and 8, the 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 projection 251 projecting perpendicular to the longitudinal axis of the connecting portion from the outer surface of the connecting portion 250. The first projection provides a support structure for the edge of a through hole 125 provided in the first pole piece 120. The through hole 125 includes a receiving portion 126 having a cylindrical shape with a constant diameter. The outer diameter of the projection of the first connecting element 251 is larger than the inner diameter of the receiving portion 126. The through hole 125 further 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 projection 251 may abut the edge of the through hole 125 in the transition between the V-shaped portion 127 and the receiving portion 126. The light guide further comprises a second projection 252 that can abut the tip of the through-hole 125, at the edge 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 pushed through the receiving portion until the first projection is positioned at the edge or transition of the receiving portion and the V-shaped portion 127. Generally, an edge can be understood as the boundary or edge between two surfaces. In this context, an edge refers to the transition point where the conical shape intersects with the cylindrical portion of the receiving portion. An interference fit can be understood as a tight fit between two parts in which one part is slightly larger than the other and requires some force to assemble and disassemble.

[0025] The interference fit is achieved by the cooperation of the first projection 251 of the light guide 200 with one end of the receiving portion of the through hole and, consequently, with a portion of the first pole piece 120. Furthermore, the interference fit is achieved by the cooperation of the second projection 252 with the upper edge of the receiving portion of the through hole. Thus, the first and second projections are the only elements that provide the interference fit between the light guide 200 and the first pole piece 120, and in particular, the interference fit with the through hole provided in the pole piece.

[0026] Figure 7 is a top view of the light guide 200, and Figure 8 is a cross-sectional view along line AA in Figure 7. Figure 8 shows details C and B, which illustrate the projections 251 and 252, in further detail. The second projection 252 is formed by the transition between the connecting portion 250 and a further portion 260. Hereinafter, as an example, it is assumed that the diameter of the through-hole 125 of the magnet is 4.1 mm at the receiving portion 126. It should be understood that this distance is merely an example, and other sizes having similar relationships to each other may be used in larger or smaller applications. The following embodiments are embodiments that help illustrate the dimensional relationships between the through-hole, the connecting portion of the light guide, and the projections. The diameter of the connecting portion may be 4.06 mm, which is smaller than the diameter of the through-hole of 4.1 mm, and the second projection 252 has a diameter that is clearly larger than the diameter of the through-hole, as shown in detail c of Figure 8. The first projection 251 extends radially by, for example, 0.13 mm. The length of each of the first projections 251 in the longitudinal direction may be in the range of 0.5 to 3 mm, for example, it may be 1 mm. Below the first projections 251, the diameter may 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, and the entrance portion 240 is pushed through the through hole 125 until the first projections 251 abut against the lower edge of the pole piece 120. The second projection 252 is positioned to abut at the transition of the through hole where the receiving portion 126 transitions into the V-shaped portion 128.

[0027] The first and second projections may be formed integrally with the light guide and are therefore made of the same material, such as PMMA, PMMI, or PC. The projection 251 may be sized so that it can deform without being damaged when the light guide is inserted into the through hole.

[0028] As a result, press-fit or interlocking fit can be achieved. In particular, the interlocking fit provided by the projections 251 and 252 may be a press-fit that can be assembled by cold pressing. As a result, reliable and secure fixing and precise positioning of the light guide 200 in the through hole can be achieved, thereby avoiding rattling noise and not limiting the sufficiency or the ability of the light guide to effectively mix colors. Furthermore, this design is sustainable and can be easily disassembled without damaging the material of the light guide or drive unit.

[0029] The arrangement of the speaker's different components can also be inferred from the exploded view shown in Figure 5. In the exploded view, the protective cap 158 is shown, followed by the diaphragm 150, and then the spider 140, which guides the movement of the diaphragm 150. Further included are the voice coil 165, light guide 200, and a drive unit including the pole piece 130, magnet 110, and pole piece 120. The circuit board 180 is connected to the pole piece 120 using connecting elements 190 which can be mounted as double-sided tape, and the bracket 170 closes the speaker from the rear.

[0030] Figure 9 shows a further embodiment of speaker 300, which is similar to speaker 100 described above in relation to Figures 1-5. Speaker 300 is a woofer configured to emit sound waves in a frequency range such as between 20 and 2000 Hz. The speaker comprises 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. A cap 500 is also provided. A light guide 400 having a light outlet 405 is provided, and the light guide may correspond to light guide 200, although other dimensions may be used for light guide 400. The light guide 400 is connected to the first pole piece 320 in the same manner as described in relation to Figures 1-8 to obtain an interlocking fit of the light guide to the first pole piece 320. However, larger gaps can be provided between the drive unit and the spider, and between the light guide 400 and the upper surface of the cap 500, thereby allowing for greater displacement of the diaphragm 350 relative to the drive unit, ensuring that the movement of the diaphragm is not affected by the presence of the light guide. The gap between the drive unit and the spider 340 is larger than in the embodiments described in relation to Figures 1-8, because this may result in greater displacement of the diaphragm. The gap between the drive unit and the spider may be in the range of 14-20 mm, preferably 16-17 mm. Similarly, the gap between the light guide and the cap 500 increases as the cap moves together with the diaphragm 350. The gap may be in the same range, namely 14-20 mm, preferably 17-18 mm, and therefore slightly larger than the gap between the drive unit and the spider.

[0031] Aspects of the present invention can be described by the following clauses.

[0032] 1. A speaker configured to emit sound in the direction of principal sound emission, comprising: a movable diaphragm; a drive unit comprising: a magnet for generating a magnetic field; a first pole piece having a through hole disposed to contact the magnet on a first surface of the magnet; and a second pole piece disposed to contact the magnet on a second surface of the magnet opposite to the first surface, wherein the first and second pole pieces are configured to generate a magnetic field in the air gap between the first and second pole pieces on which the diaphragm is positioned. The speaker includes a light source configured to emit light, and a light guide configured to guide the light emitted by the light source through a through-hole to the movable diaphragm in the direction of the principal sound emission, wherein the light guide comprises an elongated first section having a longitudinal axis parallel to the principal sound emission direction, and a second section extending substantially perpendicular to the elongated first section, wherein the light guide is configured to guide the light through the elongated first section to the second section, which guides the light in the direction of the movable diaphragm, and the elongated first section comprises a first connecting element and a second connecting element to provide an interference fit between the light guide and the first pole piece.

[0033] 2. The speaker according to Clause 1, wherein the through-hole comprises a receiving portion extending in a direction parallel to the main sound emission direction hole, the receiving portion comprising, in the direction of the main sound emission direction, a first end cooperating with the first connecting element for interference fitting and a second end cooperating with the second connecting element.

[0034] 3. The speaker according to Clause 2, wherein the diameter of the receiving portion is substantially constant in a direction perpendicular to the longitudinal axis.

[0035] 4. The speaker according to any of the preceding clauses, wherein the elongated first section of the light guide comprises an inlet portion configured to receive the light emitted by the light source, following the direction of principal sound emission; a connecting portion comprising a first connecting element and a second connecting element; and a further portion wherein the elongated first section is thereby connected to the second section.

[0036] 5. The speaker according to Clause 4, wherein the outlet portion has a trapezoidal shape in which the diameter of the elongated first section perpendicular to the direction of principal sound emission increases toward the second section.

[0037] 6. The speaker according to clause 4 or 5, wherein the connecting portion has a substantially cylindrical shape and the cylindrical axis is parallel to the direction of principal sound emission.

[0038] 7. The speaker according to any of the preceding clauses, wherein the first connecting element has a projection extending perpendicularly from the elongated first section perpendicular to the longitudinal axis and cooperating with the first end of the through hole, and the second connecting element has a second projection extending perpendicularly from the light guide perpendicular to the longitudinal axis and cooperating with the second end of the through hole.

[0039] 8. The speaker according to any one of the clauses 2 to 7, wherein the first pole piece is formed in the through hole to include, following the direction of principal sound emission, a first conical portion, a connecting portion thereafter, and a second conical portion thereafter, wherein the diameter of the first conical portion increases in the direction opposite to the direction of principal sound emission, and the diameter of the second conical portion increases in the direction of principal sound emission.

[0040] 9. The speaker according to any one of the clauses 4 to 8, wherein the connecting portion has a cylindrical shape, and the longitudinal axis of the connecting portion extends parallel to the direction of principal sound emission.

[0041] 10. The speaker according to any of the preceding clauses, further comprising a cap connected to the diaphragm, wherein the light guide is designed to guide the light emitted by the light source to the cap.

[0042] 11. The speaker described in any of the preceding clauses, wherein the second section of the light guide is designed not to include any connections to the drive unit.

[0043] 12. The speaker described in any of the preceding clauses, wherein the magnet is a ferrite magnet.

[0044] 13. A speaker according to any of the preceding clauses, further comprising a circuit board to which the light source is connected, and a fixing element provided on the first pole piece for fixing and connecting the circuit board to the first pole piece.

[0045] In summary, the audio speaker 100 described above provides an effective way to illuminate the front of the diaphragm 150. Furthermore, a compact volume is achieved, and effective connection of the light speaker to other components, particularly the light guide 200, is possible. This speaker can also withstand the demanding requirements of an automobile.

Claims

1. A speaker (100, 300) configured to emit sound in the direction of the main sound emission, - Movable diaphragm (150, 350) and - A drive unit - A magnet that generates a magnetic field, - A first pole piece having a through hole positioned on the first surface of the magnet so as to contact the magnet, - comprising a second pole piece positioned to contact the magnet on the second surface of the magnet opposite to the first surface, wherein the first and second pole pieces are configured to generate a magnetic field in the air gap between the first and second pole pieces on which the diaphragm is positioned, The aforementioned drive unit, - 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 principal sound emission direction, wherein the light guide comprises an elongated first section having a longitudinal axis parallel to the principal sound emission direction, and a second section extending substantially perpendicular to the elongated first section, wherein the light guide is configured to guide the light through the elongated first section to the second section, which guides the light in the direction of the movable diaphragm, and the elongated first section comprises a first connecting element and a second connecting element to provide an interference fit between the light guide and the first pole piece. The aforementioned speaker (100, 300).

2. The speaker according to claim 1, wherein the through hole comprises a receiving portion extending in a direction parallel to the main sound emission direction hole, and the receiving portion comprises a first end that cooperates with the first connecting element for interference fitting in the direction of the main sound emission direction and a second end that cooperates with the second connecting element.

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

4. The speaker according to claim 1, wherein the elongated first section of the light guide comprises an inlet portion configured to receive the light emitted by the light source, following the direction of the main sound emission; a connecting portion comprising a first connecting element and a second connecting element; and a further portion wherein the elongated first section is thereby connected to the second section.

5. The speaker according to claim 4, wherein the outlet portion has a trapezoidal shape in which the diameter of the elongated first section perpendicular to the direction of main sound emission increases toward the second section.

6. The speaker according to claim 4 or 5, wherein the connecting portion has a substantially cylindrical shape and the cylindrical axis is parallel to the direction of principal sound emission.

7. The speaker according to claim 1, wherein the first connecting element extends perpendicularly from the elongated first section perpendicular to the longitudinal axis and comprises a projection that cooperates with the first end of the through hole, and the second connecting element extends perpendicularly from the light guide perpendicular to the longitudinal axis and comprises a second projection that cooperates with the second end of the through hole.

8. The speaker according to claim 2, wherein the first pole piece is formed such that, in the through hole, following the direction of principal sound emission, it comprises a first conical portion, a connecting portion thereafter, and a second conical portion thereafter, wherein the diameter of the first conical portion increases in the direction opposite to the direction of principal sound emission, and the diameter of the second conical portion increases in the direction of principal sound emission.

9. The speaker according to claim 4, wherein the connecting portion has a cylindrical shape, and the longitudinal axis of the connecting portion extends parallel to the direction of principal sound emission.

10. The speaker according to claim 1, further comprising a cap connected to the diaphragm, wherein the light guide is designed to guide the light emitted by the light source to the cap.

11. The speaker according to claim 1, wherein the second section of the light guide is designed not to include any connections to the drive unit.

12. The speaker according to claim 1, wherein the magnet is a ferrite magnet.

13. - A circuit board to which the light source is connected, - A fixing element provided on the first pole piece, the fixing element which fixes and connects the circuit board to the first pole piece, The speaker according to claim 1, further comprising the following:

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