JP7528658B2 - Speaker system - Google Patents

Description

This disclosure relates to a speaker system.

Some speakers have a non-magnetic elastic material such as rubber between the magnetic circuit and the iron frame (see, for example, Patent Document 1). Some speakers have an inner box and an outer box, and a coil-shaped spring member is placed between the inner box and the outer box (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 58-28491 Patent No. 6424963 specification

The vibrations of the speaker may be transmitted to the component to which the speaker frame is attached via the speaker frame. This may cause the component to resonate or generate abnormal noise due to chatter. This disclosure provides a speaker system that can suppress the transmission of vibrations to the speaker frame.

The speaker system of the present disclosure includes a magnetic circuit that generates a magnetic field, a voice coil that is displaceable relative to the magnetic circuit in response to an input electrical signal, a diaphragm connected to the voice coil, and a speaker frame that is connected to and holds the magnetic circuit and the diaphragm, and a spring-like member is used to connect the magnetic circuit and the speaker frame.

"Connected" includes both direct and indirect connection. "Directly connected" includes two components in contact and a state that can be considered equivalent to two components in contact. An example of a state that can be considered equivalent to two components in contact is a state in which the two components are fixed together with an adhesive. "Indirectly connected" means that another component is placed between the two components.

FIG. 1 is a front view of a speaker system according to a first embodiment. 1 is a cross-sectional view of a speaker system according to a first embodiment. FIG. FIG. 11 is a cross-sectional view of a speaker system according to a second embodiment. 1 is an exploded perspective view showing a vehicle door equipped with a speaker system according to an embodiment;

The first embodiment of the present disclosure will be described below with reference to the drawings. Note that the dimensions and scale of each part in the drawings are appropriately different from the actual ones. Furthermore, the embodiment described below is a preferred specific example of the present invention. For this reason, various technically preferable limitations are imposed on this embodiment. However, the scope of the present disclosure is not limited to these forms unless otherwise specified in the following description to the effect that the present disclosure is limited.

Figure 1 is a front view of the speaker system according to the first embodiment. Figure 2 is a cross-sectional view of the speaker system according to the first embodiment. The speaker system 1 shown in Figures 1 and 2 is used as an in-vehicle speaker system mounted on a vehicle such as an automobile, for example, as shown in Figure 5. The speaker system 1 may be attached to a door of the vehicle via a door trim, for example. The use of the speaker system 1 is not limited to in-vehicle use, and may be for other purposes. The object to which the speaker system 1 is attached is not limited to the door trim. The object to which the speaker system 1 is attached has an opening formed opposite the diaphragm 2. For example, a flange portion of a speaker frame 4 described later is fixed to a peripheral portion surrounding the opening, and the speaker system 1 is fixed to the object to which it is attached.

In FIG. 2, a portion of the speaker system 1 is shown in cross section. This cross section is taken along the axis O of the speaker system 1. The axis O is a line segment that is parallel to the vibration direction of the diaphragm 2, which will be described later, and passes through the center of the diaphragm 2. The direction that intersects with the axis O is the radial direction Y of the speaker. In the direction of the axis O, the side on which the diaphragm 2 is arranged is the front side, and the opposite side is the rear side. The axis O of the speaker is the axis O of the magnetic circuit 5, which will be described later.

The speaker system 1 is a structure that has a diaphragm 2, a drive unit 3, and a speaker frame 4, and these are unitized.

The diaphragm 2 is a vibrating body made of a sheet material that emits sound by vibration. The sheet material is obtained, for example, by impregnating a fiber base material with a resin material and then curing or solidifying the resin material. Examples of the resin material include acrylic resin, polyurethane, melamine resin, modified rubber resin, and phenolic resin. Examples of the fiber base material include carbon fiber, aramid fiber, glass fiber, ceramic fiber, silica fiber, metal fiber, potassium titanate fiber, zirconia fiber, polyacrylate fiber, polyphenylene sulfide fiber, vinylon fiber, rayon fiber, nylon fiber, polyester fiber, acrylic fiber, polypropylene fiber, polyethylene fiber, cotton fiber, hemp fiber, and cellulose fiber.

The diaphragm 2 vibrates in a direction along the axis O. The diaphragm 2 is cone-shaped. Note that the shape of the diaphragm 2 is not limited to a cone shape and may be, for example, a dome shape.

The driving unit 3 is a mechanism that drives the diaphragm 2 based on an input electrical signal. The driving unit 3 includes a magnetic circuit 5 that generates a magnetic field and a voice coil 6 that is connected to the diaphragm 2.

The magnetic circuit 5 includes a magnet 10, a yoke 11, and a center pole 12. The magnet 10 is disk-shaped. The thickness direction of the magnet 10 is along the axis O. The yoke 11 and the center pole 12 are made of a magnetic material.

The yoke 11 includes a disk portion 13 and a cylindrical portion 14. The thickness direction of the disk portion 13 is along the direction of the axis O. The disk portion 13 is disposed on the rear side of the magnet 10. The cylindrical portion 14 protrudes from the disk portion 13 to the front side. The cylindrical portion 14 is formed around the axis O. The opening on the rear side of the cylindrical portion 14 is closed by the disk portion 13. When viewed from the direction of the axis O, the magnet 10 is disposed within the cylindrical portion 14. The cylindrical portion 14 is formed to the front side of the magnet 10 in the direction of the axis O.

The center pole 12 is cylindrical and is arranged on the front side of the magnet 10. The center pole 12 is arranged on the axis O. In the direction of the axis O, the center pole 12 is arranged within the cylindrical portion 14 of the yoke 11.

The magnetic flux generated by the magnet 10 passes through the yoke 11 and the center pole 12. The magnetic flux passing through the magnetic circuit 5 creates a magnetic field around the magnetic circuit 5. The voice coil 6 is placed within the magnetic field generated by the magnetic circuit 5.

The speaker system 1 includes a bobbin 15 around which the voice coil 6 is wound. The bobbin 15 includes a cylindrical portion 16 and a center cap 17. The center cap 17 closes the opening on the front side of the cylindrical portion 16. The cross-sectional shape of the center cap 17 along the axis O is an arc shape. The center cap 17 bulges so as to protrude toward the front side. The center cap 17 protrudes toward the front side in the direction of the axis O beyond the first end face 5a of the magnetic circuit 5. In the direction of the axis O, the first end face 5a of the magnetic circuit 5 is disposed on the front side, and the second end face 5b is disposed on the rear side.

The voice coil 6 is wound around the outer circumferential surface of the cylindrical portion 16 of the bobbin 15. The voice coil 6 is fixed to the bobbin 15 and can move together with the bobbin 15. The voice coil 6 is connected to the diaphragm 2 via the bobbin 15.

The diaphragm 2 is formed around the center cap 17 when viewed from the direction of the axis O. The inner circumference 2a of the diaphragm 2 is connected to the outer circumference of the center cap 17.

The speaker system 1 has an elastic edge portion 18. The edge portion 18 is ring-shaped and is provided along the outer periphery 2b of the diaphragm 2. The outer periphery 2b of the diaphragm 2 is connected to the edge portion 18. The diaphragm 2 is connected to the speaker frame 4 via the edge portion 18.

The voice coil 6 is displaceable relative to the magnetic circuit 5. A gap is formed between the magnetic circuit 5 and the voice coil 6 in the axial O direction and the radial Y direction.

The magnetic circuit 5 has a flange portion 19 that protrudes in the radial direction Y. The flange portion 19 protrudes from the cylindrical portion 14. The yoke 11 includes the flange portion 19. The yoke 11 is formed around the entire circumference of the magnetic circuit 5 in the circumferential direction. In a cross section along the axis O direction, the flange portion 19 is plate-shaped.

The speaker frame 4 holds the diaphragm 2 and the magnetic circuit 5. The speaker frame 4 is made of iron, metal material, or resin material. The shape of the speaker frame 4 is not limited to the shape shown in FIG. 2 and can be any shape as long as it can hold the diaphragm 2 and the magnetic circuit 5.

The speaker frame 4 comprises a first frame 20 and a second frame 21. In the direction of the axis O, the first frame 20 is disposed on the front side of the second frame 21. The first frame 20 has a cone portion 22 that houses the diaphragm 2, and an extension portion 23 that houses part of the magnetic circuit 5. The inner diameter of the cone portion 22 increases from the rear side toward the front side. In the direction of the axis O, the length of the cone portion 22 is roughly the same as the length of the diaphragm 2.

The speaker frame 4 includes a diaphragm housing section 24 that houses the diaphragm 2, and a magnetic circuit housing section 25 that houses the magnetic circuit 5. The diaphragm housing section 24 is formed by the cone portion 22 of the first frame 20. The diaphragm housing section 24 covers the diaphragm 2 from the outside in the radial direction Y.

The magnetic circuit housing 25 is composed of an extension 23 of the first frame 20 and a second frame 21. In the axial O direction, the front side of the magnetic circuit 5 is housed in the extension 23, and the back side of the magnetic circuit 5 is housed in the second frame 21. The magnetic circuit housing 25 covers the magnetic circuit 5 from the outside in the radial direction Y. In the axial O direction, the length of the extension 23 and the length of the second frame 21 are roughly the same. The inner diameter of the magnetic circuit housing 25 is larger than the outer diameter of the magnetic circuit 5. As viewed from the axial O direction, the magnetic circuit 5 is disposed inside the magnetic circuit housing 25. The inner diameter of the magnetic circuit housing 25 is the inner diameter of the portion where the stopper portion 40 described later is not formed. The outer diameter of the magnetic circuit 5 is the outer diameter of the portion where the flange portion 19 is not formed. In the radial direction Y, a gap is formed between the speaker frame 4 and the magnetic circuit 5.

The first frame 20 and the second frame 21 are connected using flanges 26 and 27. The flange 26 is formed at the end on the rear side of the first frame 20. The flange 27 is formed at the end on the front side of the second frame 21. The flanges 26 and 27 are connected using screws. The first frame 20 and the second frame 21 may be connected in other configurations.

Here, the speaker system 1 includes a spring-like member 30 that connects the magnetic circuit 5 to the speaker frame 4. The spring-like member 30 includes a first leaf spring 31 and a second leaf spring 32. The first leaf spring 31 and the second leaf spring 32 are arranged spaced apart in the direction of the axis O. The first leaf spring 31 is connected to the first end face 5a of the magnetic circuit 5 and the speaker frame 4. The second leaf spring 32 is connected to the second end face 5b of the magnetic circuit 5 and the speaker frame 4. The plate thickness direction of the first leaf spring 31 is parallel to the direction of the axis O. The plate thickness direction of the second leaf spring 32 is parallel to the direction of the axis O.

Figure 3 is a front view of the leaf spring. As shown in Figure 3, the first leaf spring 31 and the second leaf spring 32 have the same configuration. The first leaf springs 31 and 32 may have different configurations. Below, the first leaf spring 31 will be described, and a description of the second leaf spring 32 will be omitted.

The first leaf spring 31 includes a first ring portion 33, a second ring portion 34, and a connecting portion 35. The first ring portion 33 is disposed on the inner peripheral side, and the second ring portion 34 is disposed on the outer peripheral side. The connecting portion 35 of the first leaf spring 31 is disposed between the first ring portion 33 and the second ring portion 34 in the radial direction Y, and connects the first ring portion 33 and the second ring portion 34. The first leaf spring 31 has four connecting portions 35. The number of connecting portions 35 is not limited to four, and may be three, or five or more.

The connecting portion 35 includes a first portion 35a having an arc shape, a second portion 35b protruding from the first portion 35a toward the first ring portion 33, and a third portion 35c extending from the first portion 35a toward the second ring portion 34. The first portion 35a has a predetermined length in the circumferential direction of the first ring portion 33. Gaps are formed between adjacent connecting portions 35 in the circumferential direction. In the radial direction R, gaps are formed between the first portion 35a and the first ring portion 33, and between the first portion 35a and the second ring portion 34.

The first ring portion 33 of the first leaf spring 31 is joined to the first end face 5a of the magnetic circuit 5, and the second ring portion 34 is joined to the speaker frame 4. The second ring portion 34 is joined to the first end face 25a of the magnetic circuit housing portion 25. The first end face 25a of the magnetic circuit housing portion 25 is the front end face of the extension portion 23 of the first frame 20. The first leaf spring 31 may be screwed to the speaker frame 4 or may be glued. The first leaf spring 31 may also be joined to the speaker frame 4 by other methods.

The first ring portion 33 of the second leaf spring 32 is joined to the second end face 5b of the magnetic circuit 5, and the second ring portion 34 is joined to the speaker frame 4. The second ring portion 34 is joined to the second end face 25b of the magnetic circuit housing portion 25. The second end face 25b of the magnetic circuit housing portion 25 is the end face on the rear side of the second frame 29. The second leaf spring 32 may be screwed to the speaker frame 4 or may be glued. The second leaf spring 32 may be joined to the speaker frame 4 by other methods.

The amount of displacement of the first ring portion 33 relative to the second ring portion 34 in the axial O direction is greater than the amount of displacement of the first ring portion 33 relative to the second ring portion 34 in the radial Y direction. The first ring portion 33 is more easily displaced in the axial O direction relative to the second ring portion 34 than in the radial Y direction. The elastic modulus of the first leaf spring 31 parallel to the axial O is smaller than the elastic modulus in the radial Y direction. The radial Y direction is perpendicular to the axial O direction.

As shown in FIG. 2, the speaker system 1 has a stopper portion 40 that suppresses movement of the magnetic circuit 5 along the axis O. The stopper portion 40 includes a first stopper 41 and a second stopper 42. The first stopper 41 and the second stopper 42 protrude radially inward from the speaker frame 4. In a cross section along the axis O, the first stopper 41 and the second stopper 42 are plate-shaped. The plate thickness direction of the first stopper 41 and the second stopper 42 is along the axis O. In the axis O direction, a gap is formed between the first stopper 41 and the second stopper 42 into which the flange portion 19 of the magnetic circuit 5 is inserted.

The first stopper 41 is disposed on the front side of the flange portion 19 of the magnetic circuit 5 in the direction of the axis O. The first stopper 41 is formed around the entire circumference of the speaker frame 4 in the circumferential direction. The first stopper 41 is formed in the radial direction Y up to a position where it overlaps with the flange portion 19 of the magnetic circuit 5.

The first stopper 41 and the flange portion 19 face each other in the direction of the axis O and can abut against each other. The first stopper 41 can abut against the abutment surface 19a on the front side of the flange portion 19. Abutment includes cases where they can come into direct contact and cases where they can come into indirect contact. Cases where they can come into indirect contact include cases where they can come into indirect contact via another member. When the damper 43 described below is disposed between the first stopper 41 and the flange portion 19, the first stopper 41 and the flange portion 19 come into indirect contact with each other.

The second stopper 42 is disposed on the rear side of the flange portion 19 of the magnetic circuit 5 in the direction of the axis O. The second stopper 42 is formed around the entire circumference of the speaker frame 4 in the circumferential direction. The second stopper 42 is formed in the radial direction Y up to a position where it overlaps with the flange portion 19 of the magnetic circuit 5.

The second stopper 42 and the flange portion 19 face each other in the direction of the axis O and can abut against each other. The second stopper 42 can abut against the abutment surface 19b on the rear side of the flange portion 19.

The speaker system 1 includes a damper 43 disposed between the stopper portion 40 and the flange portion 19. The damper 43 is a cushioning material that attenuates impact. The damper 43 may be an elastic body. The damper 43 is ring-shaped. In a cross section along the axis O direction, the damper 43 is plate-shaped. The dampers 43 are provided on both sides of the flange portion 19 in the axis O direction.

In the speaker system 1 according to this embodiment, the voice coil 6 can be displaced relative to the magnetic circuit 5 in response to an input electrical signal. When the diaphragm 2 vibrates in response to the input electrical signal, a repulsive force is generated between the voice coil 6 and the magnetic circuit 5. In response to the electrical signal, the magnetic circuit 5 vibrates (oscillates) at a longer period (lower frequency) than the diaphragm 2. In the speaker system 1, the elastic modulus of the spring-like member 30 is specified so that the oscillation of the magnetic circuit 5 does not adversely affect the sound produced by the speaker system 1.

Specifically, it is preferable that the displacement of the magnetic circuit 5 relative to the speaker frame 4 is smaller than the displacement of the voice coil 6 relative to the speaker frame 4. In the speaker system 1, at least one of the weight ratio between the magnetic circuit 5 and the voice coil 6 or the elastic modulus of the spring-like member 30 in the direction of the axis O is specified. This allows the speaker system 1 to make the displacement of the magnetic circuit 5 relative to the speaker frame 4 smaller than the displacement of the voice coil 6 relative to the speaker frame 4.

In the speaker system 1, the magnetic circuit 5 is connected to the speaker frame 4 via the spring-like member 30. With the speaker system 1, even if the magnetic circuit 5 vibrates, the transmission of vibration to the speaker frame 4 is suppressed. This suppresses the transmission of vibration from the speaker frame 4 to the component to which the speaker frame 4 is attached. As a result, the component to which the speaker frame 4 is attached is prevented from resonating and from generating abnormal noise due to chatter.

In the speaker system 1, a first leaf spring 31 and a second leaf spring 32 are provided on both end faces of the magnetic circuit 5 in the direction of the axis O. The magnetic circuit 5 is supported by the first leaf spring 31 and the second leaf spring 32 from both sides in the direction of the axis O, so that the inclination of the magnetic circuit 5 with respect to the direction of the axis O is suppressed.

The speaker system 1 includes a first leaf spring 31 and a second leaf spring 32, whose thickness directions are parallel to the axis O direction. The displacement of the first leaf spring 31 and the second leaf spring 32 in the radial direction R is smaller than the displacement in the axis O direction. The displacement of the first ring portion 33 in the radial direction R is smaller than the displacement in the axis O direction. This makes it possible to make the positional deviation of the magnetic circuit 5 in the radial direction R smaller than the positional deviation in the axis O direction.

The speaker system 1 includes a stopper portion 40, which can suppress movement of the magnetic circuit 5 in the direction of the axis O. When the magnetic circuit 5 moves to the front side, the first stopper 41 suppresses movement of the flange portion 19. When the magnetic circuit 5 moves to the rear side, the second stopper 42 suppresses movement of the flange portion 19.

The speaker system 1 includes a damper 43, which suppresses the impact of the flange portion 19 on the stopper portion 40. The vibration of the magnetic circuit 5 is effectively damped. The transmission of force due to contact between the stopper portion 40 and the flange portion 19 is suppressed, improving reliability.

The speaker system 1 has an elastic edge portion 18. The diaphragm 2 is connected to the speaker frame 4 via the edge portion 18. The speaker system 1 prevents vibrations from the diaphragm 2 from being transmitted to the speaker frame 4. In the speaker system 1, even if the diaphragm 2 and the magnetic circuit 5 vibrate, the transmission of vibrations to the speaker frame 4 is prevented, and therefore the transmission of vibrations from the speaker frame 4 to the attachment site is prevented.

Next, a speaker system 51 according to a second embodiment will be described with reference to FIG. 4. FIG. 4 is a cross-sectional view of the speaker system according to the second embodiment. The speaker system 51 according to the second embodiment differs from the speaker system 1 according to the first embodiment in that the configuration of the magnetic circuit 55 is different. In the description of the second embodiment, the same description as in the first embodiment will be omitted.

The magnetic circuit 55 includes a magnet 60, a yoke 61, and a top plate 62. The yoke 61 and the top plate 62 are made of a magnetic material. The magnet 60 is ring-shaped. The magnet 60 is formed around the axis O. The magnet 60 has a flange portion 69 that protrudes in the radial direction Y. The movement of the flange portion 69 in the direction of the axis O is restricted by the stopper portion 40.

The yoke 61 includes a disk portion 63 and a cylindrical portion 64. The thickness direction of the disk portion 63 is along the axis O direction. The cylindrical portion 64 protrudes from the disk portion 63 to the front side. The disk portion 63 closes the opening on the rear side of the magnet 60.

The top plate 62 is ring-shaped and is disposed in front of the magnet 60. When viewed from the direction of axis O, the cylindrical portion 64 of the yoke 61 is disposed at the center of the magnet 60 and the top plate 62.

The magnetic flux generated by the magnet 60 passes through the yoke 61 and the top plate 62. The magnetic flux passing through the magnetic circuit 55 creates a magnetic field around the magnetic circuit 55. The voice coil 6 is placed within the magnetic field generated by the magnetic circuit 55.

The magnetic circuit 55 is supported by the speaker frame 4 via a first leaf spring 31 and a second leaf spring 32. The first leaf spring 31 is connected to a first end surface 55a of the magnetic circuit 55 and the speaker frame 4. The second leaf spring 32 is connected to a second end surface 55b of the magnetic circuit 55 and the speaker frame 4.

The speaker system 51 according to the second embodiment has the same effect as the speaker system 1 according to the first embodiment.

Next, a vehicle door equipped with a speaker system 1 will be described. FIG. 5 is an exploded perspective view showing a vehicle door equipped with a speaker system according to an embodiment. As shown in FIG. 5, the vehicle door 101 includes a first panel 102, which is called an outer panel and is in contact with the outside, a second panel 103, which is called a door trim and is provided on the vehicle compartment side of the vehicle door 101 as an interior material, a third panel 104, which is called an inner panel and is provided between the first panel 102 and the second panel 103, and a speaker system 1 attached to the second panel 103. The first panel 102 and the third panel 104 are generally made of steel plates, and the front, rear and lower outer edge portions of the panels are joined to each other. The first panel 102 and the third panel 104 may also be made of an aluminum alloy or a carbon material. The second panel 103 is generally made of a synthetic resin molded plate. However, in this disclosure, the constituent materials of these panels 102, 103, and 104 are not limited to those mentioned above. A frame 107 is provided on the top of the first panel 102 and the third panel 104, housing the window glass 106 so that it can move up and down.

The third panel 104 is provided with an opening 104a for accommodating the speaker system 1, and multiple openings 104b for accommodating a motor, door lock actuator, etc. (not shown) for moving the window glass 106 up and down. In this embodiment, at least some of these openings 104b are not blocked by a motor, door lock actuator, etc. (not shown), and no dedicated member is provided for blocking the openings 104b.

The second panel 103 is attached to the third panel 104 by removably fixing the outer edge of the second panel 103 to the third panel 104 with connecting members 109X and 109Y. A groove-shaped packing attachment portion is provided along the outer edge of the second panel 103, and a packing 110 is fitted into the packing attachment portion, and this packing 110 maintains the airtightness of the space between the second panel 103 and the third panel 104. This space communicates with the space formed between the first panel 202 and the third panel 104 through at least some openings provided in the third panel 104.

The speaker system 1 is attached to the second panel 103 via a mounting member 114. The mounting member 114 is annular and has a screw hole 114a for mounting the speaker system 1 and a hole 114b for passing a screw 115 for mounting the mounting member 114 to the second panel 103. The mounting member 114 is attached to the speaker system 1 by passing a screw 116 through a hole 4c provided in the flange 4b of the speaker frame 4 and screwing it into a screw hole 114a provided in the mounting member 114. The speaker system 1 is attached to the second panel 103 by passing a screw 115 through the hole 114b of the mounting member 114 and screwing the screw 115 into a screw hole 103b provided in the second panel 103. In the area of the second panel 103 where the speaker system 1 is attached, a plurality of holes 103c are provided for emitting the sound generated by the speaker system 1 into the vehicle cabin.

The above-mentioned examples merely show representative forms of the present disclosure, and the present disclosure is not limited to the above-mentioned examples, and various modifications and additions are possible without departing from the gist of the present disclosure.

In the above embodiment, the speaker frame 4 is configured to include a magnetic circuit housing 25, but the speaker frame 4 may be configured not to include a magnetic circuit housing 25. The speaker system 1 may be configured to include a support portion extending from the diaphragm housing 24 to the rear side, and a stopper portion 40 may be provided on this support portion. A plurality of such support portions are provided in the circumferential direction of the speaker system 1.

In the above-described embodiment, the magnetic circuit 5 is supported by the spring-like members 30 from both sides in the direction of the axis O, but the spring-like members 30 may be provided on only one of the front side and the back side of the magnetic circuit 5. The spring-like members 30 are not limited to the first leaf spring 31 or the second leaf spring 32, and may be other leaf springs. For example, the leaf springs may be disc springs. The spring-like members 30 are not limited to leaf springs, and may be other elastic bodies.

In the above embodiment, the spring-like member 30 is disposed on the first end face 5a and the second end face 5b, which are the end faces of the magnetic circuit 5 in the axial O direction, but the spring-like member 30 may be connected to other faces of the magnetic circuit 5. The spring-like member 30 may be connected to the outer peripheral surface of the magnetic circuit 5.

The speaker system is not limited to a configuration including a spring-like member 30 whose elastic modulus in a direction parallel to the axis O is smaller than that in a direction perpendicular to the axis O, and the elastic modulus in a direction parallel to the axis O may be the same as or larger than that in a direction perpendicular to the axis O.

In the above embodiment, the speaker system 1 has an edge portion 18, and the diaphragm 2 is connected to the speaker frame 4 via the edge portion 18, but the diaphragm 2 may also be connected to the speaker frame 4 via another member.

In the above embodiment, the speaker frame 4 is configured to include a stopper portion 40, but the speaker frame 4 may be configured not to include a stopper portion 40. The stopper portion 40 is not limited to being provided on both sides of the flange portion 19, and may be provided on either the front side or the back side of the flange portion 19.

In the above embodiment, the magnetic circuit 5 includes a flange portion 19, but the magnetic circuit 5 may not include the flange portion 19.

1, 51...speaker system, 2...diaphragm, 2b...outer circumference of diaphragm, 4...speaker frame, 5, 55...magnetic circuit, 6...voice coil, 18...edge portion, 19...flange portion, 19a, 19b...contact surface, 25...magnetic circuit housing portion, 30...spring-like member, 31...first leaf spring, 32...second leaf spring, 40...stopper portion, 43...damper, O...axis of magnetic circuit, Y...radial direction.

Claims (8)

A magnetic circuit that generates a magnetic field;
a voice coil that is displaceable relative to the magnetic circuit in response to an input electric signal;
A diaphragm connected to the voice coil;
a speaker frame that is connected to and holds the magnetic circuit and the diaphragm;
A speaker system comprising:
A speaker system using a spring-like member for the connection between the magnetic circuit and the speaker frame ,
the spring-like member has a smaller elastic modulus in a direction parallel to the axis of the magnetic circuit than in a direction perpendicular to the axis of the magnetic circuit;
At least one of a weight ratio between the magnetic circuit and the voice coil or an axial elastic modulus of the spring-like member in the magnetic circuit is defined so that a displacement of the magnetic circuit with respect to the speaker frame is smaller than a displacement of the voice coil with respect to the speaker frame.
Speaker system . A magnetic circuit that generates a magnetic field;
a voice coil that is displaceable relative to the magnetic circuit in response to an input electric signal;
A diaphragm connected to the voice coil;
a speaker frame that is connected to and holds the magnetic circuit and the diaphragm;
A speaker system comprising:
A speaker system using a spring-like member for the connection between the magnetic circuit and the speaker frame ,
The speaker frame has a stopper portion that suppresses movement of the magnetic circuit in the axial direction.
Speaker system . The vibration plate has an elastic edge portion provided along an outer periphery thereof,
The diaphragm is connected to the speaker frame via the edge portion.
3. A speaker system according to claim 1 or 2 . The spring-like member includes a first leaf spring,
4. The speaker system according to claim 1 , wherein a thickness direction of the first leaf spring is parallel to an axial direction of the magnetic circuit. the spring-like member includes the first leaf spring and a second leaf spring disposed spaced apart from the first leaf spring in the axial direction,
5. The speaker system according to claim 4 , wherein the first leaf spring and the second leaf spring are provided on both end surfaces of the magnetic circuit in the axial direction. The speaker frame includes a magnetic circuit housing portion that is continuous with the magnetic circuit in an axial direction and covers the magnetic circuit from a radially outer side that intersects with the axial direction.
6. The speaker system according to claim 1, The magnetic circuit includes a flange portion that protrudes outward in a radial direction intersecting with the axial direction,
The stopper portion includes a contact surface that is capable of contacting the flange portion in the axial direction.
3. The speaker system according to claim 2 . The speaker system according to claim 7 , further comprising a damper disposed between the stopper portion and the flange portion in the axial direction.

Images