JP7455658B2 - speaker - Google Patents

Description

The present invention relates to a speaker that generates sound pressure by vibrating a vibrating sheet having a coil provided on the sheet surface.

Patent Document 1 describes an invention relating to a speaker equipped with a sheet-like diaphragm.
The diaphragm is curved, and a voice coil is formed in the shape of a planar coil by etching at one end of the diaphragm. The magnetic circuit portion has a magnetic gap traversed by the magnetic field. The one end of the diaphragm is inserted into the magnetic gap together with an elastic member made of rubber or the like, and the voice coil is located within the magnetic gap. Further, the other end of the diaphragm is attached to the frame via another elastic member.

In this speaker, a magnetic field that crosses the voice coil in the magnetic circuit section and a current that flows through the voice coil cause a vibration force to act on the voice coil, and this vibration force is transmitted to the curved part of the diaphragm, reducing the sound pressure. Occur.

JP2009-278523A

In the speaker described in Patent Document 1, the rigidity of the diaphragm is relatively high in the part where the voice coil is formed, but the rigidity of the diaphragm is relatively high in the part where the voice coil is formed, that is, the boundary part between the curved part of the diaphragm and the voice coil. Since there is no metal layer, the rigidity is partially reduced at the boundary portion. Therefore, when vibration force is generated in the voice coil, bending or folding tends to occur in the boundary portion, resulting in a problem that the efficiency of transmitting vibrations to the curved portion that generates sound pressure decreases.

The present invention solves the above-mentioned conventional problems, and prevents the sheet rigidity from decreasing at the boundary between the drive section where the voice coil of the vibrating sheet is formed and the main body section that mainly generates sound pressure. The purpose of this invention is to provide a speaker that can prevent such problems.

The present invention provides a speaker that includes a vibrating sheet provided with a main body section that mainly generates sound pressure and a drive section that has a voice coil, and a magnetic field generation section that applies a magnetic field to the voice coil.
The vibrating sheet includes a flexible sheet base material and a metal layer provided on the sheet surface of the sheet base material in at least a portion of the main body portion,
The voice coil is formed by leaving a conductor layer made of the same metal material as the metal layer in a spiral shape on the sheet surface,
At least a part of the conductor layer located at the outermost periphery of the spiral shape and the metal layer provided on the main body are continuous.

In the speaker of the present invention, the voice coil is provided with a driving energizing path whose current direction is in a direction intersecting the vibration direction of the vibrating sheet, and the driving energizing path is located within a magnetic gap of the magnetic field generating section. and
Preferably, the conductor layer located at the outermost periphery is continuous with the metal layer provided on the main body over the entire length in the current direction of the drive current path located on the main body side of the voice coil.

In the speaker of the present invention, for example, the conductor layer constituting the voice coil is formed by etching the metal layer provided continuously with the main body part in the drive part. For example, the metal layer is a copper foil layer.

In the speaker of the present invention, since the metal layer is provided on the main body of the vibrating sheet, the rigidity of the diaphragm can be set slightly higher, and the vibration force generated by the voice coil can be transmitted to a wide range of the main body. can. Moreover, since this metal plate is continuous with the outermost conductor layer of the voice coil, it is possible to prevent the sheet rigidity from partially decreasing at the boundary between the drive section including the voice coil and the main body section. can. Therefore, it is possible to efficiently transmit the vibration force acting on the voice coil to the main body.

A sectional view showing a speaker according to an embodiment of the present invention, An exploded perspective view showing the structure of the first sounding part of the speaker shown in FIG. A front view showing a vibration sheet provided in the speaker shown in FIG. 1, An enlarged front view partially enlarging the vibrating sheet shown in FIG.

In the speaker 1 according to the embodiment of the present invention, the Y1-Y2 direction is the vertical direction, the X1-X2 direction is the horizontal direction, and the Z1-Z2 direction is the vertical direction.
The speaker 1 of the embodiment shown in FIG. 1 is configured by integrating a first sounding section 10 located on the Y1 side and a second sounding section 20 located on the Y2 side. The first sounding section 10 and the second sounding section 20 have a symmetrical shape in the vertical direction (Y1-Y2 direction). The first sounding section 10 and the second sounding section 20 have the same structure, with the first sounding section 10 having a vibrating sheet 11 and the second sounding section 20 having a vibrating sheet 21. The vibrating sheet 11 of the first sounding section 10 and the vibrating sheet 21 of the second sounding section 20 are vibrated at the same frequency. Alternatively, the vibrating sheet 11 and the vibrating sheet 21 are vibrated in different frequency bands. Furthermore, it is also possible to generate stereo sound by vibrating the vibrating sheet 11 and the vibrating sheet 21 with different voice currents.

Below, the structure and operation of the first sounding section 10 will be mainly explained.
As shown in FIG. 2, the first sounding section 10 has a support 12. As shown in FIG. The support body 12 is a support case or a support base. The support body 12 has a bottom wall portion 12a and a vertical wall portion 12b integrally formed. Side wall portions 13, 13 facing each other in the left-right direction (X1-X2 direction) are fixed to the support body 12. A support rib 12c protruding in the Y2 direction is integrally formed on the upper part of the vertical wall portion 12b of the support body 12. The end portion of the bottom wall portion 12a facing the Y2 side is a thick portion 12d, and the end surface of the thick portion 12d facing the Y2 direction is a fixing surface 12e. An opening 12f, which is a circular hole, is formed in the center of the vertical wall 12b of the support 12.

As shown in FIG. 1, the second sounding section 20 is also provided with a support 22. Similar to the support body 12 of the first sounding unit 10, the support body 22 has a bottom wall portion 22a, a vertical wall portion 22b, a support rib 22c, a thick wall portion 22d, a fixing surface 22e, and an opening portion 22f that are integrally formed. ing. Further, side wall portions 23, 23 are fixed to both sides of the support body 22 in the X1-X2 direction. It is preferable that the support body 12 of the first sound generation section 10 and the support body 22 of the second sound generation section 20 are both made of a non-magnetic material.

As shown in FIG. 1, the magnetic field generating unit 30 is provided between the fixed surface 12e formed on the support 12 of the first sound generating unit 10 and the fixed surface 22e formed on the support 22 of the second sound generating unit 20. The magnetic field generating unit 30 has a first opposing yoke 31 and a second opposing yoke 32 formed of a magnetic material. The first opposing yoke 31 is fixed to the fixed surface 12e of the support 12 provided on the first sound generating unit 10, and the second opposing yoke 32 is fixed to the fixed surface 22e of the support 22 provided on the second sound generating unit 20. In the magnetic field generating unit 30, a magnet assembly 33 is located between the first opposing yoke 31 and the second opposing yoke 32. As shown in FIG. 2, the magnet assembly 33 is composed of a lower yoke 34 formed of a magnetic material, a magnet 35 stacked thereon, and an upper yoke 36 formed of a magnetic material located thereon.

As shown in FIG. 2, a pair of spacers 37 are provided between the first opposing yoke 31 and the magnet assembly 33 with an interval in the X1-X2 direction. Spacer 37 is made of nonmagnetic material. The left and right spacers 37 are integrally formed with thin plate portions 37a extending in directions facing each other. Each spacer 37 is fixed to both the first opposing yoke 31 and the magnet assembly 33, and a thin plate portion 37a is interposed between the first opposing yoke 31 and the magnet assembly 33. The first opposing yoke 31 and the magnet assembly 33 are fixed to each other by a pair of spacers 37 . Further, the distance between the first opposing yoke 31 and the magnet assembly 33 is determined by the thickness of the thin plate portion 37a, and as shown in FIG. A magnetic gap G1 is formed.

Similarly, spacers having the same shape as the spacer 37 are provided between the second opposing yoke 32 and the magnet assembly 33 so as to be separated from each other on the X1 side and the X2 side. The second opposing yoke 32 and the magnet assembly 33 are fixed by this spacer. Further, the thin plate portion of the spacer is sandwiched between the second opposing yoke 32 and the magnet assembly 33, and the distance between the second opposing yoke 32 and the magnet assembly 33 is determined. A small magnetic gap G2 is formed between the two opposing yokes 32 and the magnet assembly 33.

As shown in FIGS. 1 and 2, a vibrating sheet 11 is disposed between a side wall 13 on the X1 side and a side wall 13 on the X2 side of the first sound generating section 10. The vibrating sheet 11 has a rectangular shape with the V1-V2 direction being the vertical direction and the longitudinal direction. Further, the vibration direction of the vibrating sheet 11 is the V1-V2 direction. The vibrating sheet 11 is divided into a drive section 11b, a main body section 11a, and a fixed end section 11c from the V2 side toward the V1 direction. The fixed end portion 11c of the vibrating sheet 11 is bonded and fixed to the upper surface of a support rib 12c provided at the Z1 side end portion of the support body 12. The vibrating sheet 11 has a planar shape in a free state, but is curved and deformed mainly in the main body portion 11a so that the vertical direction (V1-V2 direction) is the direction of curvature. This main body portion 11a is the part that mainly generates sound pressure. In the driving section 11b of the vibrating sheet 11, voice coils 40 are provided on both sides of the sheet surface facing the Y1 side and the sheet surface facing the Y2 side, and the driving section 11b and each voice coil 40 are arranged inside the magnetic gap G1. is inserted into.

Inside the magnetic gap G1, a viscous liquid such as magnetorheological fluid or oil is present between the vibrating sheet 11 and the first opposing yoke 31 and between the vibrating sheet 11 and the magnet assembly 33. . Alternatively, a thin foamed resin material or the like may be interposed. Their presence in the magnetic gap G1 prevents the vibrating voice coil 40 from hitting and rubbing against the first opposing yoke 31 and the magnet assembly 33.

3 and 4 show the surface of the vibrating sheet 11 facing the Y1 side. The vibrating sheet 11 has a sheet base material (base film) 15. The sheet base material 15 is a flexible sheet having elasticity, and is basically constructed of a resin sheet made of a synthetic resin material. The sheet base material 15 is made of polyimide resin or PET resin. As the vibration sheet 11, a so-called flexible circuit board (FPC) is used, in which a copper foil layer 16 is laminated as a metal layer on the surface of a sheet base material 15.

As shown in FIGS. 3 and 4, in the main body 11a of the vibrating sheet 11, a metal layer is formed on almost the entire sheet surface, that is, on the sheet surface excluding the edges on the X1 side and the X2 side of the main body 11a. A copper foil layer 16 is provided. By providing the copper foil layer 16, the main body 11a of the vibrating sheet 11 has increased rigidity and appropriate elasticity, and vibrations are transmitted over the entire length of the main body 11a in the V1-V2 direction. It becomes easier. The copper foil layer 16 extends continuously to the sheet surface of the drive section 11b, and the voice coil 40 is formed in the drive section 11b by partially etching the copper foil layer 16.

As shown in FIG. 4 , the voice coil 40 has a planar winding shape in which a conductor layer 41 is wound around the sheet surface of the sheet base material 15 . The conductor layer 41 is formed continuously with the copper foil layer 16 provided on the main body portion 11a. The conductor layer 41 is wound in multiple spirals around an imaginary center line O extending in the Y1-Y2 direction and perpendicular to the sheet surface of the sheet base material 15. As shown in FIGS. 2 and 3, the overall shape of the voice coil 40 includes an upper drive energization path 40a located on the V1 side, which is the side facing the main body 11a, a lower drive energization path 40b located on the V2 side, and It has a left circuit 40c located on the X1 side and a right circuit 40d located on the X2 side.

As shown in FIG. 4, in the upper drive energization path 40a and the lower drive energization path 40b, a plurality of conductor layers 41 etched into narrow width dimensions extend in parallel in the X1-X2 direction. The current direction I in the upper drive energization path 40a and the lower drive energization path 40b is perpendicular to the vibration direction (V1-V2 direction) of the vibrating sheet 11. As shown in FIG. 1, in the magnetic gap G1, the upper drive current path 40a is located between the first opposing yoke 31 and the upper yoke 36, and the lower drive current path 40b is located between the first opposing yoke 31 and the upper yoke 36. It is located between the lower yoke 34 and the lower yoke 34. As shown in FIG. 4, in the left circumferential circuit 40c and the right circumferential circuit 40d, a plurality of circumferential conductor layers 41 that connect the conductor layers 41 of the upper drive energization path 40a and the lower drive energization path 40b have curved portions. It is passing through.

As shown in Figures 3 and 4, a terminal portion 42 is integrally formed with the conductor layer 41a located at the outermost periphery of the lower drive current path 40b, and a terminal portion 43 is integrally formed with the conductor layer 41h located at the innermost periphery of the upper drive current path 40a. One of the terminal portions 42 and 43 is electrically connected to the terminal portion of the voice coil located on the sheet surface on the Y2 side of the vibrating sheet 11, and the voice coil 40 provided on the sheet surface on the Y1 side of the vibrating sheet 11 and the voice coil provided on the sheet surface on the Y2 side are connected in series.

The helical planar winding structure of the voice coil 40 shown in FIG. 4 will be described with the terminal portion 42 as a starting point. The conductor layer 41a located at the outermost periphery closest to V2 in the lower drive energizing path 40b is continuous with the terminal portion 42. The conductor layer 41a extends continuously in the X2 direction at the outermost periphery on the V2 side of the lower drive current path 40b to become a conductor layer 41b. The conductor layer 41b becomes a conductor layer 41c that goes around the outermost circumference of the right circuit 40d. This conductor layer 41c is continuous to the copper foil layer (metal layer) 16 formed on the sheet surface of the main body portion 11a through a substantially triangular continuous region 44 adjacent to the curved portion α2 on the V1 side of the right circumferential circuit 40d. do.

The copper foil layer 16 formed on the main body portion 11a passes through a substantially triangular continuous region 45 adjacent to the curved portion α1 on the V2 side of the left circumferential circuit 40c on the X1 side, and then goes around the outermost circumference of the left circumferential circuit 40c. It is continuous with the conductor layer 41d. This conductor layer 41d is continuous with a conductor layer 41e that extends from the outermost circumference on the V2 side to the second inner side in the lower drive current path 40b, and the conductor layer 41e is a conductor layer 41f located on the X2 side of the lower drive current path 40b. becomes. Furthermore, the conductor layer circulates in a spiral trajectory centered on the center line O, and reaches the terminal portion 43 via a conductor layer 41g that passes through the innermost circumference of the upper drive energizing path 40a and a conductor layer 41h that continues therefrom.

As shown in FIG. 4, the outermost conductor layer 41c of the right circuit 40d and the outermost conductor layer 41d of the left circuit 40c are conductor layers 41a, 41b, 41c, . ..., 41g, 41h form a narrow coil wire with the same width dimension. The conductor layer 41c on the X2 side is continuous with the copper foil layer 16 of the main body portion 11a through a substantially triangular continuous region 44, and the conductor layer 41d on the X1 side is also continuous with the copper foil layer 16 of the main body portion 11a via a substantially triangular continuous region 45. Continuing with layer 16. The copper foil layer 16 that connects the conductor layer 41c and the conductor layer 41d functions as the outermost conductor layer located closest to the V1 side of the upper drive current path 40a. That is, over the entire length of the upper drive current path 40a of the voice coil 40 in the current direction I, the conductor layer located at the outermost periphery of the spiral shape and the copper foil layer 16 provided on the main body portion 11a are formed continuously. Therefore, the conductor layer located at the outermost periphery of the spiral shape is formed integrally with the copper foil layer 16 provided on the main body portion 11a.

Note that the conductor layer 41c located at the outermost periphery of the right circumferential circuit 40d shown in FIG. It may extend to the outermost periphery of the current-carrying path 40a and then continue to the copper foil layer 16 of the main body portion 11a. Similarly, the conductor layer 41d located at the outermost periphery of the left circumferential circuit 40c runs along the curved portion α1 from the left circumferential circuit 40c to the upper drive energizing path 40a without forming a continuous region 45 and with a constant width dimension. The copper foil layer 16 of the main body portion 11a may be continued after extending to the outermost periphery of the main body portion 11a. In this structure, in a part of the total length in the current direction I of the upper drive current path 40a of the voice coil 40, the conductor layer located at the outermost periphery of the spiral shape and the conductor layer provided on the main body portion 11a The copper foil layer 16 is formed continuously and integrally.

As shown in FIGS. 3 and 4, the vibrating sheet 11 provided in the first sounding section 10 has a copper foil layer 16 formed on the main body portion 11a on the sheet surface facing the Y1 side of the sheet base material 15, By etching a portion of this copper foil layer 16, a spiral conductor layer 41 of the voice coil 40 is formed. However, the copper foil layer 16 is not formed on the main body portion 11a on the sheet surface facing the Y2 side of the sheet base material 15, and only the voice coil 40 is formed on the drive portion 11b on this sheet surface. However, when the rigidity of the sheet base material 15 is low, the copper foil layer 16 shown in FIGS. 3 and 4 is formed on both the sheet surface facing the Y1 side and the sheet surface facing the Y2 side of the sheet base material 15. may be formed.

The second sounding section 20 has a symmetrical shape with the first sounding section 10 in the X1-X2 direction. Similar to the vibration sheet 11, the vibration sheet 21 provided in the second sounding section 20 has voice coils 40 formed on both sides of the sheet base material 15, and has voice coils 40 formed on both sides of the sheet base material 15, and has a voice coil 40 on the surface of the sheet base material 15 facing in the Y2 direction. A copper foil layer 16 having the same shape as that shown in FIG. 4 is provided.

Next, the sound generation operation of the speaker 1 will be explained.
A voice current is applied to a pair of series-connected voice coils 40 provided on the Y1 side and Y2 side sheet surfaces of the vibrating sheet 11 shown in FIGS. 3 and 4. Similarly, voice current is also applied to a pair of series voice coils provided on the sheet surface facing the Y1 side and the sheet surface facing the Y2 side of the vibrating sheet 21 of the second sound generating section 20. The vibrating sheet 11 of the first sounding section 10 and the vibrating sheet 21 of the second sounding section 20 are vibrated by the respective voice currents. The details of the operation of the vibrating sheet 11 of the first sounding section 10 will be described below, but the operation of the vibrating sheet 21 of the second sounding section 20 is also the same.

When a voice current is applied to the two voice coils 40 provided on the sheet surface on both sides of the vibrating sheet 11 of the first sound generating section 10 and connected in series, the plurality of thin conductor layers 40 constituting the upper drive current path 40a Currents flow in opposite directions to each other in the I direction between the lower drive current path 40b and the plurality of thin conductor layers 41 constituting the lower drive current path 40b. The voice coil 40 is activated by the electromagnetic force caused by the voice current flowing through the upper drive energization path 40a and the lower drive energization path 40b and the magnetic flux that crosses the upper drive energization path 40a and the lower drive energization path 40b in opposite directions within the magnetic gap G1. A vibration force in the vertical direction (V1-V2 direction) along the seat surface acts on the drive unit 11b having the above-mentioned shape.

The vibration force acting on the voice coil 40 in the V1-V2 direction is transmitted to the curved main body portion 11a of the vibrating sheet 11, and the main body portion 11a is deformed in a undulating manner in the V1-V2 direction. Sound pressure is generated in the Y2 direction. Sound pressure is also generated from the vibrating sheet 11 in the Y1 direction, but as shown in FIG. It is also partitioned by a wall portion 12a and a vertical wall portion 12b. Therefore, the sound pressure applied from the vibrating sheet 11 in the Z1 direction and the Y2 direction and the sound pressure applied to the partitioned space on the Y1 side are less likely to interfere. Further, since the opening 12f is formed in the vertical wall 12b, the space partitioned by the side walls 13, 13, the bottom wall 12a, and the vertical wall 12b is not sealed, and the vibration sheet 11 is sealed. It is possible to avoid the space exerting a large resistance force.

As shown in FIGS. 3 and 4, the main body portion 11a of the vibrating sheet 11 is curved because a copper foil layer 16 is provided on the sheet surface of the sheet base material 15 to increase sheet rigidity. The main body portion 11a has an appropriate elastic force and can vibrate over its entire area. Furthermore, at the boundary between the main body portion 11a and the drive portion 11b of the vibrating sheet 11, the conductor layer located at the outermost periphery of the spiral shape in the upper drive current path 40a of the voice coil 40 is continuously integrated with the copper foil layer 16. has been done. Therefore, the sheet rigidity is high at the boundary between the main body portion 11a and the drive portion 11b, and it is possible to prevent the sheet rigidity from partially decreasing at this boundary as in the conventional case.

Therefore, when vibration force is applied from the voice coil 40 to the drive section 11b in the V1-V2 direction, undesirable bending or folding is less likely to occur at the boundary between the main body section 11a and the drive section 11b, and the voice coil 40 It becomes possible to efficiently transmit the vibration force from the main body portion 11a to the main body portion 11a.

In the embodiment shown in FIG. 4, the outermost conductor layer 41d of the left circuit 40c of the voice coil 40 is continuous with the copper foil layer 16 via a substantially triangular continuous region 45, and the outermost conductor layer 41d of the right circuit 40d is continuous with the copper foil layer 16 through a substantially triangular continuous region 45. The conductor layer 41c is continuous with the copper foil layer 16 via a substantially triangular continuous region 44. Therefore, the rigidity of the boundary between the voice coil 60 and the copper foil layer 16 can be further increased. That is, by providing the continuous regions 44 and 45, the conductor layer 41 of the voice coil 40 and the copper foil layer 16 of the main body portion 11a are continuous and integrally formed over the entire length of the voice coil 40 in the current direction I. becomes possible.

As shown in FIG. 4, continuous regions 44 and 45 are provided between the outermost conductor layer 41c of the right circuit 40d and the outermost conductor layer 41d of the left circuit 40c. The copper foil layer 16 is continuous. That is, the outermost conductor layer of the upper drive current path 40a is continuously integrated with the copper foil layer 16, and a portion of the copper foil layer 16 functions as the outermost conductor layer of the upper drive current path 40a. ing. Therefore, when a voice current is applied to the voice coil 40, a current i also flows through the copper foil layer 16. However, since this current i flows along the edge on the V2 side as the shortest path of the copper foil layer 16, if this edge region is located within the magnetic gap G1, the current i can be made to contribute to magnetic drive. I can do it. Furthermore, since the copper foil layer 16 is not as narrow as the other conductor layers 41, the electrical resistance of the voice coil 40 can be lowered in the portion where the current i flows.

Further, the function and effect of the voice coil 40 provided on the vibrating sheet 21 of the second sounding section 20 are the same as those of the first sounding section 10.

1 Speaker 10 First sounding section 11 Vibration sheet 11a Main body section 11b Drive section 11c Fixed end section 12 Support body 15 Sheet base material 16 Copper foil layer (metal layer)
20 Second sound generating section 21 Vibrating sheet 22 Support body 30 Magnetic field generating section 31 First opposing yoke 32 Second opposing yoke 33 Magnet assembly 34 Lower yoke 35 Magnet 36 Upper yoke 40 Voice coil 40a Upper drive energization path 40b Lower drive energization path 40c Left circuit 40d Right circuit 50 Reinforcement members 51a, 51b Reinforcement fixing section 52 Connection reinforcement section 55 Elastic support members G1, G2 Magnetic gap

Claims (4)

A speaker including a vibrating sheet provided with a main body portion that mainly generates sound pressure and a drive portion having a voice coil, and a magnetic field generation portion that applies a magnetic field to the voice coil,
The vibrating sheet includes a flexible sheet base material and a metal layer provided on the sheet surface of the sheet base material in at least a portion of the main body portion,
The voice coil is formed by leaving a conductor layer made of the same metal material as the metal layer in a spiral shape on the sheet surface,
A speaker characterized in that at least a part of the conductor layer located at the outermost periphery of the spiral shape and the metal layer provided on the main body are continuous. The voice coil is provided with a drive energization path whose current direction is in a direction intersecting the vibration direction of the vibrating sheet, and the drive energization path is located within the magnetic gap of the magnetic field generation section,
2. The conductor layer located at the outermost periphery is continuous with the metal layer provided on the main body over the entire length in the current direction of the drive current path located on the main body side of the voice coil. speaker. 3. The speaker according to claim 1, wherein the conductor layer constituting the voice coil is formed by etching the metal layer provided continuously with the main body part in the drive part. 4. The speaker according to claim 1, wherein the metal layer is a copper foil layer.

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