Speaker unit and speaker

Abstract

To provide a speaker unit and speaker that can be miniaturized. [Solution] The speaker unit 3 is equipped with a coupler 8 that connects the voice coil 5 and the diaphragm 6. The coupler 8 is connected to the voice coil 5 at its inner part, to the diaphragm 6 at its upper end in the overall height direction on its outer part, and to the damper 7 at its lower end spaced apart from the upper end in the overall height direction on its outer part.

Description

Technical Field

[0001] The present disclosure relates to a speaker unit and a speaker.

Background Art

[0002] A speaker unit includes, for example, a magnetic circuit, a voice coil bobbin around which a voice coil is wound, and a diaphragm attached to the circumferential surface of the voice coil bobbin, as disclosed in Patent Document 1 below.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a speaker unit such as Patent Document 1, it is required to be low in the overall height direction and miniaturized.

[0005] An object of the present disclosure is to provide a speaker unit and a speaker that can be miniaturized.

Means for Solving the Problems

[0006] The speaker unit according to the present disclosure includes a coupler that connects a voice coil and a diaphragm. The coupler is connected to the voice coil at an inner portion, connected to the diaphragm at an upper end portion in the overall height direction at an outer portion, and connected to a damper at a lower end portion spaced apart from the upper end portion in the overall height direction at the outer portion.

[0007] The speaker according to this disclosure comprises the speaker unit described above and an enclosure having the speaker unit, wherein the speaker unit has a frame that supports the outer connection portion of the damper and the outer connection portion of the diaphragm and is connected to the enclosure, and the frame has a ventilation passage that connects the internal and external spaces. [Effects of the Invention]

[0008] The speaker unit and speaker according to this disclosure, using the means described above, enable miniaturization. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view from the top of the speaker. [Figure 2] This is a perspective view of the speaker from the bottom. [Figure 3] This is a cross-sectional view of the speaker at line III-III in Figure 1. [Figure 4] This is a disassembled perspective view of the speaker unit. [Figure 5] This is a magnified view of the area around the speaker unit in Figure 3. [Figure 6] This is an enlarged view of section B in Figure 5, showing the connection relationship between the diaphragm, damper, and coupler. [Modes for carrying out the invention]

[0010] Hereinafter, one embodiment of this disclosure will be described with reference to the drawings.

[0011] Figure 1 is a perspective view of speaker 1 from the top. Figure 2 is a perspective view of speaker 1 from the bottom. Speaker 1 is installed, for example, in the interior of a vehicle. Speaker 1 comprises a speaker unit 3 and an enclosure 2. In the following description of speaker 1, the side on which the speaker unit 3 is provided is referred to as the top of speaker 1, and the opposite side as the bottom. The side on which the speaker control unit 23 of speaker 1 is provided is referred to as the front of speaker 1, and the other opposite side as the rear. The left side when viewing speaker 1 from the front is referred to as the left, and the opposite side as the right. The front / back, left / right, and up / down directions of speaker 1 are defined for the sake of explanation and are not limited to the above directions; they may be interchanged.

[0012] The enclosure 2 is formed in the shape of a hollow box (see Figure 3). The speaker unit 3 is mounted on the top wall 21a of the enclosure 2. The enclosure 2 is equipped with passive radiators 22 on the front, rear, and left and right side walls 21c to 21f.

[0013] Multiple passive radiators 22 are arranged in pairs on the same vibration axes P and Q on the front and rear side walls 21c and 21d of the enclosure 2, and on the left and right side walls 21e and 21f.

[0014] Speaker 1 receives drive power and drive signals from an external source, enabling the speaker unit 3 to emit sound. In addition, speaker 1 in this embodiment is equipped with a speaker control unit 23 on the front side wall 21c for controlling the output level (amplification factor), etc.

[0015] Next, the configuration of the speaker unit 3 will be described, mainly with reference to Figures 3 to 6. As shown in Figure 4, the speaker unit 3 comprises an internal magnetic circuit 4, a voice coil 5, a diaphragm 6, a damper 7, a coupler 8 connecting the voice coil 5 and the diaphragm 6, and a frame 9 that supports the diaphragm 6 and the damper 7 and is connected to the enclosure 2. The speaker unit 3 is formed in a cylindrical shape that is substantially symmetrical around the vibration axis R.

[0016] In the description of this embodiment, the side where the diaphragm 6 of the speaker unit 3 along the vibration axis R direction in FIG. 5 is provided is defined as the upper side, and the other side opposite to that side is defined as the lower side. Also, the direction along the vibration axis R direction is defined as the full height direction D of the speaker unit 3.

[0017] As shown in FIG. 5, the magnetic circuit 4 includes a yoke 41, a back plate 42, a magnet 43, and a top plate 44. The yoke 41, the back plate 42, and the top plate 44 are ferromagnetic materials for forming a magnetic path. The yoke 41 includes a disk-shaped bottom portion 411 and a cylindrical portion 412 that protrudes upward in the full height direction D from the outer portion of the bottom portion 411.

[0018] The back plate 42 and the magnet 43 are formed in a disk shape with substantially the same outer diameter. The back plate 42 is disposed above the bottom portion 411, but the back plate 42 may be integrally formed with the yoke 41. Also, the magnet 43 is disposed above the back plate 42.

[0019] The top plate 44 is formed in a cylindrical shape with substantially the same outer diameter as the back plate 42 and the magnet 43, and has a concave portion 442 at the center. The upper surface of the cylindrical portion 412 of the yoke 41 and the upper surface of the top plate 44 are disposed on substantially the same plane.

[0020] A magnetic gap G is formed between the top plate 44 and the cylindrical portion 412 of the yoke 41.

[0021] A cover 45 is disposed above and around the outer periphery of the top plate 44. The cover 45 includes an upper surface portion 451 that covers the upper end portion of the top plate 44, and an outer peripheral portion 452 that extends cylindrically from the outer peripheral edge of the upper surface portion 451 to cover a part of the outer peripheral surface of the top plate 44 and the outer peripheral surface of the magnet 43.

[0022] The voice coil 5 comprises a bobbin 51 and a coil 52. The bobbin 51 has a larger diameter than the outer diameter of the top plate 44 and a smaller diameter than the inner diameter of the cylindrical portion 412 of the yoke 41. The bobbin 51 is formed in a cylindrical shape, and a wire is wound around its outer surface to form the coil 52. The coil 52 is provided at the end of the bobbin 51 opposite to the diaphragm 6 or its peripheral portion (the lower end in this embodiment).

[0023] The bobbin 51 has a circular ventilation passage 511 that penetrates radially, intersecting the overall height direction D. Multiple ventilation passages 511 are provided in the circumferential direction of the bobbin 51. In this embodiment, the ventilation passages 511 are through-holes provided at equal intervals in the circumferential direction around the vibration axis R.

[0024] The coil 52 is placed in the magnetic gap G together with the bobbin 51. Therefore, the top plate 44 is placed inside the cylinder of the bobbin 51.

[0025] The coil 52 is wired to the outside of the speaker unit 3 via the lug terminals of the coupler 8 and connected to the drive circuit (speaker control unit 23) of the speaker unit 3.

[0026] The voice coil 5 has a disc-shaped cap 53 at the upper end of the bobbin 51. The cap 53 is provided to cover the bobbin 51 in order to prevent foreign matter from entering the inside of the speaker unit 3.

[0027] The cap 53 comprises an insertion portion 531 that is inserted into the bobbin 51 and a cover portion 532 positioned on the upper part of the bobbin 51. The outer circumference of the cover portion 532 is provided in a flange shape so as to protrude from the outer surface of the insertion portion 531 in a plane direction perpendicular to the overall height direction D. The cover portion 532 is fixed in contact with the upper end of the bobbin 51.

[0028] As shown in Figure 6, the diaphragm 6 is connected to the voice coil 5 via a coupler 8 and vibrates in conjunction with the vibration of the voice coil 5. The diaphragm 6 is formed in a substantially annular shape around the vibration axis R on the radially outer side of the voice coil 5. The diaphragm 6 has a body portion 61 provided on the inner circumference and an edge portion 62 provided on the outer circumference of the body portion 61. The body portion 61 is formed in a cone shape overall by an inclined portion 611 that slopes downward toward the speaker unit 3 as it approaches the vibration axis R.

[0029] The body portion 61 has an inner connecting portion 612 (diaphragm inner connecting portion) that connects to the coupler 8. The inner connecting portion 612 extends from the inner peripheral edge of the body portion 61 so as to bend downward toward the damper 7 side and is formed in a short cylindrical shape. The inner surface of the tip side of the inner connecting portion 612 is slightly reduced in diameter so as to protrude toward the vibration axis R side. The opening angle between the inclined portion 611 and the inner connecting portion 612 is set to an obtuse angle in the cross-sectional view in Figure 6.

[0030] The edge portion 62 includes a curved portion 621 that is convex in cross-sectional view and semicircular in shape toward the upper side in the overall height direction D (i.e., opposite to the bending direction of the inner connection portion 612), an inner connection portion 622 that is formed continuously with the inner peripheral edge of the curved portion 621 and connects to the body portion 61, and an outer connection portion 623 that is formed continuously with the outer peripheral edge of the curved portion 621 and connects to the frame 9. The curved portion 621 is flexible and supports the body portion 61 so that it can vibrate in the overall height direction.

[0031] The inner connection portion 622 is inclined downwards toward the vibration axis R side of the speaker unit 3 and is formed along the inclined portion 611. The inner connection portion 622 is connected to the inclined portion 611 from above by adhesive or the like. The outer connection portion 623 is also connected to the frame 9 from above. Therefore, the outer edge side of the diaphragm 6 is supported by the frame 9 via the edge portion 62.

[0032] The damper 7 supports the voice coil 5 via a coupler 8. The damper 7 is formed in the shape of a thin plate ring (see Figure 4). The damper 7 has a corrugated portion 71 formed in a concentric, uneven shape around the vibration axis R, and the corrugated portion 71 is flexible. In this embodiment, the corrugated portion 71 has three protrusions that project upward in the direction of the vibration axis R.

[0033] Furthermore, the damper 7 has an inner connecting portion 72 (damper inner connecting portion) that protrudes radially inward and an outer connecting portion 73 that protrudes radially outward. The inner connecting portion 72 and the outer connecting portion 73 are each formed in a flange shape. The inner connecting portion 72 is connected to the coupler 8.

[0034] The coupler 8 is connected to the voice coil 5 on its inner side. The coupler 8 is also connected to the diaphragm 6 at the upper end in the overall height direction D on its outer side. The coupler 8 is connected to the damper 7 at the lower end of the coupler 8, spaced apart from the upper end in the overall height direction D on its outer side. In other words, the diaphragm 6 and the damper 7 are connected to and positioned spaced apart from the coupler 8 in the overall height direction D.

[0035] The coupler 8 is formed in a substantially cylindrical shape overall (see Figure 4) and has an opening 81 that penetrates in the direction of the vibration axis R. The coupler 8 is also formed in a substantially inverted L shape in cross-section and comprises an annular upper surface portion 82, an inner wall portion 87 extending downward in the overall height direction D from the radially inner end of the upper surface portion 82, and an outer wall portion 83 extending downward in the overall height direction D from the radially outer end of the upper surface portion 82. The inner diameter of the outer wall portion 83 is formed to be larger than the outer diameter of the magnetic circuit 4. The inner diameter of the outer wall portion 83 is formed to slightly widen as it goes downward in the overall height direction D.

[0036] Therefore, the coupler 8 has a space portion 84 formed therein, which is larger in diameter on the lower side than on the upper side. The opening 81 is widened by the space portion 84. When the coupler 8 approaches the magnetic circuit 4 due to the vibration of the voice coil 5, a part of the magnetic circuit 4 (specifically, the cylindrical portion 412 of the yoke 41) is inserted into the space portion 84. At this time, the coupler 8 is positioned overlapping the magnetic circuit 4 in the radial direction. The coupler 8 is provided so as to be able to move back and forth along the overall height direction D between a position above the magnetic circuit 4 in the overall height direction D and a position below the magnetic circuit 4 in the overall height direction D where the magnetic circuit 4 is positioned in the space portion 84. This makes it possible to lower the overall height of the speaker unit 3 and increase the maximum stroke amount of the voice coil 5 and the vibrating components connected to the voice coil 5.

[0037] As shown in Figure 6, the space 84 has an upper space 841 enclosed by an inner wall 87, an outer wall 83, and an upper surface 82, located radially outward from the opening 81. In the coupler 8, the connection part with the inner connection part 612 of the diaphragm 6 is formed in the outer wall 83, and the upper surface 82 is positioned above the inner connection part 612 in the overall height direction D. The upper space 841 is formed above the space 84.

[0038] The inner edge of the upper surface portion 82 of the coupler 8 is formed in a convex arc shape in cross-section, as shown in the enlarged view of section A in Figure 4 and in Figure 6. The inner circumferential surface of the inner wall portion 87 that forms the opening 81 of the coupler 8 is formed as an inclined surface that widens slightly towards the top in the overall height direction D. In addition, rib-shaped connecting protrusions 821 are formed on the inner circumferential surface of the inner wall portion 87, projecting radially inward relative to the inclined surface of the inner circumferential surface. Multiple connecting protrusions 821 are provided at intervals around the vibration axis R.

[0039] The end face 821a of the connecting projection 821 is formed substantially flush with the inner circumferential surface 81a of the opening 81. The coupler 8 is connected to the voice coil 5 by connecting the inner circumferential surface 81a and inner wall portion 87 of the opening 81, including the end face of the connecting projection 821, to the outer circumferential surface of the bobbin 51. The coupler 8 is fixed to the voice coil 5, for example, by adhesive.

[0040] The coupler 8 has a positioning portion 85 on the outer side of the outer wall portion 83 that positions the connection position of the inner connection portion 612 of the diaphragm 6 in the overall height direction D (up and down direction of the vibration axis R) (see enlarged view of portion C in Figure 4). Rib-shaped linear protrusions 852 are formed on the outer circumferential surface of the outer wall portion 83, projecting radially outward from this outer circumferential surface. Multiple linear protrusions 852 are provided at approximately equal intervals in the circumferential direction of the outer wall portion 83. In addition, a stepped portion 851 is formed at the upper end of each linear protrusion 852. The stepped portion 851 abuts against the inner connection portion 612 and acts as a positioning portion 85 that determines the position in the overall height direction D. Since multiple linear protrusions 852 are provided on the outer wall portion 83, the rigidity of the coupler 8 can be increased.

[0041] The upper surface 82 of the coupler 8, like the upper surface of the diaphragm 6, is exposed to the upper surface of the speaker unit 3 and functions as a sound-emitting surface. Similarly, the cap 53 is also exposed to the upper surface of the speaker unit 3 and functions as a sound-emitting surface. Because the upper surface 82 of the coupler 8 is exposed to the upper surface of the speaker unit 3 more than the connection part with the diaphragm 6, the height D of the coupler 8 can be made longer on the sound-emitting surface side (upper side). Therefore, even without making the speaker unit 3 thicker in the overall height direction D, the distance between the upper surface 82 of the coupler 8 and the cylindrical portion 412 of the yoke 41 can be secured, and the coupler 8 can be positioned to allow for large amplitude.

[0042] The coupler 8 has a flange-shaped connecting portion 831 projecting radially outward at the lower end of the outer wall portion 83. In this embodiment, the connecting portion 831 is formed continuously in the circumferential direction. The connecting portion 86 may be provided intermittently in the circumferential direction of the outer wall portion 83.

[0043] The inner connection portion 72 of the damper 7 (inner damper connection portion) is connected to the connection portion 831 by surface contact (i.e., surface-to-surface contact) from below in the overall height direction D, and by adhesive or the like. Since the connection portion 831 is formed continuously with the lower end of the outer wall portion 83 of the coupler 8, a larger area can be secured on the lower surface than on the upper surface. By making surface contact between the inner connection portion 72 of the damper 7 and the lower surface of this connection portion 831 from below in the overall height direction D, a sufficient connection area between the damper 7 and the coupler 8 can be secured even in a small space.

[0044] Furthermore, the coupler 8 is equipped with a ventilation passage 832 that connects the internal and external spaces. The ventilation passage 832 is formed by a circular through-hole that penetrates radially, and multiple such passages are provided at equal intervals around the vibration axis R.

[0045] The outer wall portion 83 of the coupler 8 extends downward, and the height D of the coupler 8 is formed to such an extent that the diaphragm 6 and the damper 7 are separated, so that the voice coil 5 can vibrate stably in a straight line. As shown in Figure 5, the damper 7 is connected to the lower end of the outer wall portion 83, but is provided so as to be able to move back and forth between a position above the magnetic circuit 4 in the overall height D direction and a position below that overlaps with the magnetic circuit 4 in the radial direction intersecting the overall height D direction. This allows for a wide range of motion of the damper 7 while keeping the height D of the coupler 8 low, and enables the diaphragm 6 to be provided with a large amplitude. In this way, by keeping the height D of the coupler 8 low, it is possible to prevent the weight of the vibration system components from increasing excessively and reducing the efficiency of the sound output.

[0046] In Figure 5, the frame 9 is formed in the shape of a closed-bottom circular cup with an opening 96 at the top and the bottom closed in the overall height direction D. The sides of the frame 9 are formed in the shape of a roughly frustoconical cylinder, with the inner diameter narrowing towards the bottom due to multiple stepped sections. The speaker unit 3 is fixed via the frame 9 to the opening 24 formed in the upper wall 21a of the enclosure 2.

[0047] The frame 9 has an upper space 93, a lower space 92, and a magnetic circuit housing 91 inside. The magnetic circuit housing 91, which has a small inner diameter and is formed on the bottom side of the frame 9, houses and fixes each component that makes up the magnetic circuit 4 (yoke 41, back plate 42, magnet 43, top plate 44, and cover 45).

[0048] The lower space 92 and the upper space 93 are separated by a damper 7. The lower space 92 is taller in the vertical direction and has a larger diameter than the magnetic circuit housing 91. The upper space 93 is shorter in the vertical direction and has a larger diameter than the lower space 92.

[0049] Frame 9 has side wall portions 921 in the lower space 92 that widen as they extend upward. Frame 9 also has side wall portions 931 in the upper space 93 that widen as they extend upward.

[0050] The frame 9 has ventilation passages 922 and 932 that connect the internal and external spaces. Multiple ventilation passages 922 are formed at circumferential intervals in the side wall portion 921 of the lower space portion 92 on the lower side of the damper 7. Multiple ventilation passages 922 are provided at equal intervals around the vibration axis R and are formed as substantially rectangular through-holes that penetrate in the radial direction. Multiple ventilation passages 932 are formed at circumferential intervals in the side wall portion 931 of the upper space portion 93 on the lower side of the diaphragm 6, which is on the upper side of the damper 7. Multiple ventilation passages 932 are provided at equal intervals around the vibration axis R and are formed as substantially rectangular through-holes that penetrate in the radial direction. The ventilation passages 932 have larger openings than the ventilation passages 922.

[0051] Between the side wall portion 921 and the side wall portion 931, an annular stepped portion 94 is formed, which is substantially parallel to a plane substantially perpendicular to the vibration axis R. The outer connection portion 73 of the damper 7 is connected to the stepped portion 94, and the frame 9 supports the outer connection portion 73 of the damper 7. The outer connection portion 73 is fixed to the inner surface (upper surface) of the stepped portion 94 by adhesive or the like.

[0052] The frame 9 has a fixed portion 95 at its upper end. The fixed portion 95 is formed in a flange shape that protrudes radially outward from the opening edge of the upper space portion 93. The speaker unit 3 is fixed to the enclosure 2 by having the fixed portion 95 attached to the edge of the opening 24. The speaker unit 3 closes the opening 24 of the enclosure 2, thereby creating a sealed space inside the enclosure 2. The fixed portion 95 has a plurality of through holes 951 that penetrate in the vertical direction. The frame 9 is fixed to the enclosure 2 by fastening screw members inserted through the through holes 951 to screw holes 211 of the enclosure 2.

[0053] The outer connection portion 623 of the diaphragm 6 is connected to the inner portion of the fixed portion 95. The frame 9 supports the outer connection portion 623 of the diaphragm 6 by the fixed portion 95. The diaphragm 6 separates the internal space of the frame 9 (upper space portion 93, lower space portion 92, magnetic circuit housing portion 91) from the external space. The outer connection portion 623 is fixed to the upper surface of the fixed portion 95 by adhesive or the like.

[0054] In the speaker unit 3, the connection point (inner connection point 622) between the body portion 61 and the edge portion 62 of the diaphragm 6 is provided between the inner connection point 72 and the outer connection point 73 of the damper 7 in the radial direction. Although the outer diameter of the damper 7 is larger than the outer diameter of the body portion 61, the circumference of the edge portion 62 and the circumference of the damper 7 are formed to be approximately the same length in the radial direction.

[0055] The coupler 8 is provided so as to be able to move back and forth between the upper space 93 and the lower space 92. As shown in Figure 5, the coupler 8 is provided so as to be able to move back and forth between an upper position above the magnetic circuit 4 in the overall height direction D (position of the coupler 8 shown by the dashed line) and a lower position overlapping the magnetic circuit 4 in the radial direction intersecting the overall height direction D (position of the coupler 8 shown by the double dashed line). When the coupler 8 swings upward, it moves above the diaphragm 6 connected to the coupler 8 in its initial position shown by the solid line. When the coupler 8 swings downward, it moves below the damper 7 connected to the coupler 8 in its initial position shown by the solid line. The coupler 8 may also be configured to move until there is no gap between the top surface 871 of the space 84 and the upper end 412a of the cylindrical part 412, or until it comes into contact with the upper end 412a of the cylindrical part 412.

[0056] As the coupler 8 moves downward from the upper space 93 and enters the lower space 92, the cylindrical portion 412 of the yoke 41 enters the space 84 of the coupler 8 relative to it. At this time, the air in the space 84 of the coupler 8 is pushed out of the ventilation passage 832 into the upper space 93, and also pushed out of the gap between the cylindrical portion 412 and the outer wall portion 83 into the lower space 92. Simultaneously, the air that has flowed into the upper space 93 is pushed out of the ventilation passage 932 to the outside of the frame 9, and the air that has flowed into the lower space 92 is pushed out of the ventilation passage 922 to the outside of the frame 9.

[0057] On the other hand, when the coupler 8 moves from its entry position in the lower space 92 to the upper space 93, the cylindrical portion 412 of the yoke 41 exits the space 84 of the coupler 8. At this time, air is drawn into the space 84 of the coupler from the upper space 93 via the ventilation passage 832, and air is also drawn into the lower space 92 through the gap between the cylindrical portion 412 and the outer wall portion 83. Simultaneously, air is drawn into the upper space 93 from the ventilation passage 932, and air is drawn into the lower space 92 via the ventilation passage 922. In this way, air is ventilated between the two spaces, the upper space 93 and the lower space 92, between the inside and outside of the coupler 8.

[0058] The operation of speaker unit 3 and speaker 1 will now be described. When power is supplied to coil 52 from the drive circuit of speaker unit 3 (speaker control unit 23 or an external drive circuit), current flows through coil 52, and a driving force is generated in the direction of the vibration axis R due to the action of the magnetic field of the magnetic gap G, causing the bobbin 51 to vibrate together with coil 52. As a result, the coupler 8 and diaphragm 6 vibrate, and sound is radiated. The direction of vibration of diaphragm 6 is approximately the same as the overall height direction D of voice coil 5.

[0059] The vibrations of the diaphragm 6 are transmitted to the internal space of the enclosure 2 via the ventilation passage 932. The passive radiator 22 vibrates in response to the air pressure changes transmitted from the diaphragm 6 through the ventilation passage 932 of the frame 9, reinforcing the mid-to-low frequency range.

[0060] Therefore, speaker 1 can emit sound into the surroundings from speaker unit 3 and multiple passive radiators 22, making it possible to configure a small speaker capable of wideband reproduction.

[0061] In this embodiment, a speaker unit 3 equipped with a coupler 8 connecting a voice coil 5 and a diaphragm 6 has been described. In the speaker unit 3, the coupler 8 is connected to the voice coil 5 at its inner part, to the diaphragm 6 at the upper end in the overall height direction D of the outer part, and to the damper 7 at the lower end spaced apart from the upper end in the overall height direction of the outer part.

[0062] In the speaker unit 3, the diaphragm 6 and damper 7 are spaced apart in the overall height direction D and connected to the voice coil 5 via a coupler 8, allowing the voice coil 5 (and the diaphragm 6 connected to it) to vibrate stably in a straight line. Furthermore, since the connection points between the diaphragm 6 and the damper 7 in the coupler 8 are formed at the lower end in the overall height direction D (vibration direction), the radial length of the damper 7 can be ensured relative to the overall outer diameter of the speaker unit 3. Therefore, the amplitude of the diaphragm 6 relative to the outer diameter of the speaker unit 3 can be increased.

[0063] Furthermore, the speaker unit 3 is equipped with a coupler 8, which connects the damper 7 to the voice coil 5. This allows the connection position between the damper 7 and the coupler 8 (the inner connection portion 72 and the connection portion 831) to be moved below the upper end of the magnetic circuit 4 (in this embodiment, the cylindrical portion 412 of the yoke 41). As a result, the speaker unit 3 can increase the amplitude of the diaphragm 6 and the voice coil 5 with respect to the overall height direction D. The speaker unit 3 can achieve one or more of the above effects and be miniaturized in the overall height direction D.

[0064] The speaker unit 3 is equipped with a ventilation passage 832 that connects the internal and external spaces of the coupler 8. When the coupler 8 moves up and down due to vibration, air in the internal space 84 of the coupler 8 enters and exits through the gap between the coupler 8 and other components (for example, in this embodiment, the gap between the coupler 8 and the yoke 41), which may generate wind noise (air noise). In this embodiment, the speaker unit 3 is provided with a ventilation passage 832, which allows air to circulate between the internal and external spaces of the coupler 8 between the upper space 93 and the lower space 92. Therefore, a wide flow path is secured for the entry and exit of air between the internal and external spaces of the coupler 8, improving ventilation efficiency and preventing or reducing the generation of the above-mentioned noise.

[0065] Furthermore, the space 84 has an upper space 841 at its top, and even at the lower position where the cylindrical portion 412 of the yoke 41 enters the space 84, the space of the upper space 841 is maintained. This upper space 841 ensures that the air inside the space 84 is compressible, and prevents increased ventilation resistance when the cylindrical portion 412 moves backward and vents through the gap between the ventilation passage 832 and the yoke 41. Therefore, the diaphragm 6 can vibrate smoothly in a straight line.

[0066] Furthermore, a ventilation passage 511 is provided in the bobbin 51, facilitating ventilation between the internal space of the bobbin 51 and the space 84. The ventilation passage 511 is positioned at a different height in the overall height direction D than the ventilation passage 832 of the coupler 8. This prevents abrupt changes in ventilation resistance during the forward and backward movement of the diaphragm 6, allowing the diaphragm 6 to vibrate smoothly in a straight line.

[0067] The diaphragm 6 has an inner connection portion (inner connection portion 612) that connects to the coupler 8. The coupler 8 also has a positioning portion 85 on its outer side that positions the connection position of the inner connection portion (inner connection portion 612) in the overall height direction D. The speaker unit 3 can connect the diaphragm 6 to the coupler 8 with high precision in the overall height direction D.

[0068] The coupler 8 has a flange-shaped connecting portion 831 that protrudes radially outward. The damper 7 also has an inner damper connecting portion (inner connecting portion 72) that protrudes radially inward, and the inner damper connecting portion (inner connecting portion 72) is connected to the connecting portion 831 by surface contact from below in the overall height direction D. Since the damper 7 extends radially inward to the end side of the coupler 8, the overall radial length of the damper 7 can be increased. Therefore, the circumference of the corrugation portion 71 can be increased, and the amplitude of the diaphragm 6, coupler 8, and voice coil 5 can be increased.

[0069] Furthermore, the speaker unit 3 has a frame 9 connected to the enclosure 2. The frame 9 supports the outer connection portion 73 of the damper 7 and the outer connection portion 623 of the diaphragm 6, and has ventilation passages 922 and 932 that connect the space inside and outside the frame 9. The ventilation passages 922 and 932 improve the ventilation efficiency inside and outside the frame 9, allowing the diaphragm 6 and damper 7 to vibrate smoothly up and down.

[0070] The enclosure 2 includes a passive radiator 22 that vibrates in response to changes in air pressure transmitted from the diaphragm 6 through the air passage 932 of the frame 9. Since the enclosure 2 is equipped with a small speaker unit 3, it can be configured as a small speaker 1 with good bass characteristics.

[0071] Multiple passive radiators 22 are arranged so as to lie on the same vibration axis P and Q. Since the passive radiators 22 lying on the same vibration axis P and Q vibrate in approximately synchronous motion toward or toward the enclosure 2, it is possible to prevent the speaker 1 from moving away from the mounting surface due to the vibration of the passive radiators 22.

[0072] According to the speaker unit 3 and speaker 1 of the above embodiment, miniaturization is possible in the radial direction and the overall height direction D. In particular, although the speaker unit 3 is configured to have a small vibration area of ​​the diaphragm 6 in the radial direction, the inclusion of a coupler 8 enables a large amplitude of the diaphragm 6. As a result, the speaker unit 3 and speaker 1 can reduce air noise while increasing the maximum mechanically permissible amplitude of the diaphragm 6, thereby achieving a sound quality that is sufficient for practical use.

[0073] The embodiments described above can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims and their equivalents.

[0074] For example, in the above embodiment, the coupler 8 is shown to have an outer wall portion 83 formed in a cylindrical shape around the vibration axis R, with a ventilation passage 832 passing through in the radial direction. However, if the outer wall portion 83 is formed inclined to widen as it moves upward or downward in the overall height direction D along the vibration axis R, the ventilation passage 832 may be configured to connect the inner and outer spaces of the coupler 8 and the damper 7, which are separated vertically or diagonally vertically. Furthermore, the shape and position of the ventilation passage 832 can be any configuration as long as it connects the inner and outer spaces of the coupler 8. The ventilation direction of the ventilation passage 832 may be radial, in the direction of the vibration axis R, or in the inclined direction.

[0075] The ventilation passage 832 of the coupler 8 may be a through-hole of a shape other than circular. For example, the ventilation passage 832 may be a through-hole with a slit-shaped opening, or a mesh-like through-hole. If the ventilation passage 832 is a mesh-like through-hole, the outer wall portion 83 may be formed in part (for example, intermittently arranged in the circumferential direction) or entirely from a mesh plate.

[0076] Although the configuration in which the outer wall portion 83 of the coupler 8 is formed along the overall height direction D has been described, the outer wall portion 83 may also be formed with a large incline relative to the overall height direction D. For example, the outer wall portion 83 may be formed with a large incline, curve, or step shape so as it extends downwards toward the speaker unit 3, widening as it goes. In this case, the lower opening 842 of the space portion 84 inside the outer wall portion 83 can be made larger, and the cylindrical portion 412 of the yoke 41 can move back and forth more smoothly toward the space portion 84.

[0077] In the speaker unit 3, the space 84 of the coupler 8 may be formed to extend above the connection point between the diaphragm 6 and the coupler 8 (the inner connection point 612 and the stepped portion 851). In this case, the speaker unit 3 can drive the connection point between the diaphragm 6 and the coupler 8 below the upper end of the structure of the magnetic circuit 4 (yoke 41 in this embodiment). Therefore, the speaker unit 3 can further increase the amplitude of the diaphragm 6 and the voice coil 5 with respect to the overall height direction D.

[0078] Furthermore, although this embodiment describes a configuration in which the positioning portion 85 is formed in a rib shape and the diaphragm 6 is positioned by the stepped portion 851, the positioning portion 85 may be configured with other shapes such as recesses or grooves.

[0079] The configuration of one embodiment described above is extracted and illustrated below. [1] It is equipped with a coupler that connects the voice coil and the diaphragm, The aforementioned coupler is The voice coil is connected to the inner part, The outer portion is connected to the diaphragm at the upper end in the overall height direction, The damper is connected at the lower end of the outer portion, which is spaced apart from the upper end in the overall height direction. Speaker unit. [2] The speaker unit according to [1], wherein the coupler comprises a ventilation passage connecting the interior and exterior spaces. [3] The diaphragm has an inner connection portion that is connected to the coupler, The speaker unit according to [1], wherein the coupler has a positioning portion on its outer side for positioning the connection position of the inner connection portion of the diaphragm in the overall height direction. [4] The coupler has a flange-shaped connecting portion that protrudes outward in the radial direction intersecting the overall height direction, The damper has an inner damper connection portion formed on the radially inward side, The damper inner connection portion is connected to the connection portion by surface contact from the rear in the overall height direction. The speaker unit described in [1]. [5] A speaker unit as described in any one of [1] to [4], and an enclosure having the speaker unit, The speaker unit has a frame that supports the outer connection portion of the damper and the outer connection portion of the diaphragm, and is connected to the enclosure. The frame has a ventilation passage that connects the interior and exterior spaces. Speaker. [6] The speaker according to [5], wherein the enclosure comprises a passive radiator that vibrates in response to changes in air pressure inside the enclosure caused by the vibration of the diaphragm. [7] The speaker described in [6], wherein multiple passive radiators are arranged on the same vibration axis. [Explanation of symbols]

[0080] 1 speaker 2 enclosures 3. Speaker unit 4. Magnetic circuit 5 Voice coil 6 Diaphragm 7 Damper 8 Coupler 9 frames 21a Upper wall 21b Lower wall 21c~21f Side wall 22 Passive radiator 23 Speaker control unit 24 Opening 41 Yoke 42 Backplate 43 Magnet 44 Top plate 45 Cover 51 Bobbin 52 Coil 53 Cap 61 Body section 62 Edge section 71 Corrugated section 72 Inner connection section 73 Outer connection 81 Opening 81a Inner surface 82 Top surface 83 External wall section 84 Space section 85 Positioning section 86 Connection section 87 Inner wall section 91 Magnetic circuit housing section 92 Lower space 93 Upper space 94 Stepped part 95 Fixed part 96 Opening

Claims

1. It is equipped with a coupler that connects the voice coil and the diaphragm, The aforementioned coupler is The voice coil is connected to the inner part, The outer portion is connected to the diaphragm at the upper end in the overall height direction, The damper is connected at the lower end of the outer portion, which is spaced apart from the upper end in the overall height direction. Speaker unit.

2. The speaker unit according to claim 1, wherein the coupler comprises a ventilation passage connecting the internal and external spaces.

3. The diaphragm has an inner connection portion that is connected to the coupler, The speaker unit according to claim 1, wherein the coupler has a positioning portion on its outer side for positioning the connection position of the inner connection portion of the diaphragm in the overall height direction.

4. The coupler has a flange-shaped connecting portion that protrudes outward in the radial direction intersecting the overall height direction, The damper has an inner damper connection portion formed on the radially inward side, The damper inner connection portion is connected to the connection portion by surface contact from the rear in the overall height direction. The speaker unit according to claim 1.

5. A speaker unit according to any one of claims 1 to 4, and an enclosure having the speaker unit, The speaker unit has a frame that supports the outer connection portion of the damper and the outer connection portion of the diaphragm, and is connected to the enclosure. The frame has a ventilation passage that connects the interior and exterior spaces. Speaker.

6. The speaker according to claim 5, wherein the enclosure comprises a passive radiator that vibrates in response to changes in air pressure inside the enclosure caused by the vibration of the diaphragm.

7. The speaker according to claim 6, wherein a plurality of passive radiators are arranged on the same vibration axis.

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