WO2021131705A1 - Haut-parleur et véhicule - Google Patents

Haut-parleur et véhicule Download PDF

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Publication number
WO2021131705A1
WO2021131705A1 PCT/JP2020/045865 JP2020045865W WO2021131705A1 WO 2021131705 A1 WO2021131705 A1 WO 2021131705A1 JP 2020045865 W JP2020045865 W JP 2020045865W WO 2021131705 A1 WO2021131705 A1 WO 2021131705A1
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WO
WIPO (PCT)
Prior art keywords
sound
speaker
acoustic member
opening
emitting surface
Prior art date
Application number
PCT/JP2020/045865
Other languages
English (en)
Japanese (ja)
Inventor
潤弥 松岡
Original Assignee
ヤマハ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ヤマハ株式会社 filed Critical ヤマハ株式会社
Publication of WO2021131705A1 publication Critical patent/WO2021131705A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00—Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/02—Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones

Definitions

  • the present invention relates to a speaker and a vehicle.
  • Patent Document 1 discloses a sounding unit that emits sound by vibrating a diaphragm housed in a housing.
  • the housing has a case body provided in front of the diaphragm.
  • a space is formed between the case main body and the diaphragm, and the case main body is provided with a plurality of openings.
  • the space and the opening constitute a Helmholtz resonator.
  • the sound pressure of the fundamental frequency in the sound emitted from the diaphragm is increased by the Helmholtz resonator.
  • in-vehicle speakers are arranged inside a panel such as an instrument panel or a head console.
  • the speaker may be covered with a panel from a design point of view or the like.
  • the panel becomes an obstacle that hinders the propagation of the sound from the speaker, and the high-frequency sound from the speaker is attenuated.
  • the unit described in Patent Document 1 cannot suitably enhance the high-frequency sound. Therefore, the unit described in Patent Document 1 has a problem that it becomes difficult to hear the sound from the speaker when it is used for in-vehicle use or the like.
  • an object of the present invention is to make it easier to hear the sound from the speaker even in an environment where there is an obstacle at a position facing the front of the speaker.
  • the speaker according to a preferred embodiment of the present invention is based on a vibrating plate having a sound emitting surface for emitting sound and an audio signal indicating sound limited to a predetermined frequency band.
  • An acoustic member having a driving unit for driving a vibrating plate and at least one opening, and arranged so as to form a space forming a Helmholtz resonator together with the at least one opening between the sound emitting surface and the sound emitting surface.
  • the Helmholtz resonator enhances the components within the predetermined frequency band among the frequency components of the sound from the sound emitting surface, and attenuates the components exceeding the predetermined frequency band.
  • the speaker includes a sound emitting unit including a cone-shaped diaphragm having a sound emitting surface for emitting sound, and the sound emitting unit in a state where the sound emitting surface is exposed to an external space.
  • a sound emitting unit including a cone-shaped diaphragm having a sound emitting surface for emitting sound, and the sound emitting unit in a state where the sound emitting surface is exposed to an external space.
  • the vehicle according to a preferred embodiment of the present invention has a speaker according to any of the above-mentioned aspects.
  • FIG. 5 is a cross-sectional view taken along the line A1-A1 in FIG. It is a top view of the acoustic member in 2nd Embodiment.
  • FIG. 7 is a cross-sectional view taken along the line A2-A2 in FIG. It is a conceptual diagram for demonstrating the case where a speaker is installed in a space separated from a listening space by a shield. It is a figure for demonstrating the case where a speaker is installed in a vehicle.
  • FIG. 1 is a perspective view schematically showing the appearance of the speaker 10 according to the first embodiment.
  • FIG. 2 is a cross-sectional view of the speaker 10 according to the first embodiment.
  • X-axis X1 direction
  • Y1 direction the direction opposite to the X1 direction
  • Y2 direction the direction opposite to the Y1 direction
  • Z1 direction the direction opposite to the Z1 direction
  • Z2 direction the direction opposite to the Z1 direction
  • the Z-axis is an axis along the vibration direction of the diaphragm 21, which will be described later. Further, viewing from the Z1 direction or the Z2 direction is referred to as "planar view”.
  • the speaker 10 is, for example, an in-vehicle speaker arranged inside an instrument panel of a vehicle such as an automobile or a panel such as a head console.
  • the speaker 10 is driven by an audio signal input from an external device such as an amplifier (not shown) to emit sound based on the audio signal.
  • the voice signal is a signal indicating voice limited to a predetermined frequency band.
  • the predetermined frequency band is, for example, a band generally used for voice communication, and specifically, is in the range of 0.3 KHz or more and 3.4 KHz or less.
  • the use of the speaker 10 is not limited to in-vehicle use, and may be used for other purposes. Further, the speaker 10 is suitable when it is installed in a space separated from the listening space by a shield.
  • the speaker 10 is a speaker assembly having a sound emitting unit 20, a cabinet 30, and an acoustic member 40.
  • the sound emitting unit 20 has a diaphragm 21, a drive unit 22, and a frame 23, and is a structure in which these are unitized.
  • the diaphragm 21 is a vibrating body made of a sheet material.
  • the sheet material is obtained, for example, by curing or solidifying the fiber base material in a state of being impregnated with the resin material.
  • the resin material include acrylic resin, polyurethane, melamine resin, modified rubber resin, phenol resin and the like.
  • 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, and nylon. Examples thereof include fibers, polyester fibers, acrylic fibers, polypropylene fibers, polyethylene fibers, cotton fibers, hemp fibers and cellulose fibers.
  • the diaphragm 21 has a sound emitting surface 21a that emits sound.
  • the diaphragm 21 is arranged so as to vibrate in the direction along the Z axis, and the sound emitting surface 21a is a surface of both sides of the diaphragm 21 facing the Z1 direction.
  • the diaphragm 21 of this embodiment is a cone type. Therefore, it can be said that the sound emitting surface 21a is the inner wall surface of the diaphragm 21.
  • the shape of the diaphragm 21 is not limited to the cone shape, and may be, for example, a dome shape or the like.
  • the drive unit 22 is a mechanism that drives the diaphragm 21 based on the input audio signal.
  • the drive unit 22 has, for example, a coil fixed to the diaphragm 21 and a permanent magnet that generates a magnetic field acting on the coil.
  • the coil vibrates the diaphragm 21 by the interaction of magnetic force with the permanent magnet when an electric audio signal is input. Due to this vibration, a sound based on the sound signal is emitted from the sound emitting surface 21a.
  • the drive unit 22 may drive the diaphragm 21 based on an audio signal, and is not limited to a configuration having a coil and a permanent magnet, and is arbitrary.
  • the frame 23 is a structure that supports the diaphragm 21 and the drive unit 22.
  • the frame 23 is made of, for example, iron or a metal material or a resin material.
  • the diaphragm 21 and the drive unit 22 are appropriately fixed to the frame 23 with screws, adhesives, or the like.
  • the shape of the frame 23 is not limited to the shape shown in FIG. 2, and is arbitrary as long as it can support the diaphragm 21 and the drive unit 22.
  • the cabinet 30 is a box body to which the sound emitting unit 20 and the acoustic member 40 are attached.
  • the cabinet 30 is made of, for example, a resin material or a metal material.
  • the cabinet 30 is roughly a hollow rectangular parallelepiped having a space S0.
  • the cabinet 30 includes side plates 31X1 and 31X2 arranged along the X axis, side plates 31Y1 and 31Y2 arranged along the Y axis, and top plates 31Z1 and bottom plates 31Z2 arranged along the Z axis.
  • Each of the side plates 31X1 and 31X2 is a flat plate-shaped member perpendicular to the X axis.
  • Each of the side plates 31Y1 and 31Y2 is a flat plate-shaped member perpendicular to the Y axis.
  • Each of the top plate 31Z1 and the bottom plate 31Z2 is a flat plate-shaped member perpendicular to the Z axis.
  • the sound emitting unit 20 and the acoustic member 40 are attached to the top plate 31Z1.
  • each of the sound emitting unit 20 and the acoustic member 40 is fixed to the top plate 31Z1 by fitting, screwing, adhesive, or the like.
  • the sound emitting unit 20 is arranged between the top plate 31Z1 and the bottom plate 31Z2. Therefore, the sound emitting unit 20 is arranged in the space S0 of the cabinet 30.
  • the top plate 31Z1 is provided with an opening 32 for exposing the sound emitting surface 21a of the diaphragm 21 to the external space.
  • the acoustic member 40 is a member that is arranged so as to form a space S1 with the sound emitting surface 21a of the diaphragm 21 and has an opening 41.
  • the acoustic member 40 of the present embodiment has a plate shape and is arranged along a plane perpendicular to the Z axis, as will be described in detail later.
  • the space S1 and the opening 41 constitute a Helmholtz resonator.
  • the Helmholtz resonator enhances the frequency components of the sound from the sound emitting surface 21a within a predetermined frequency band of the audio signal, and attenuates the components exceeding the predetermined frequency band.
  • FIG. 3 is a diagram conceptually showing a typical Helmholtz resonator 50.
  • the Helmholtz resonator 50 has a container 51 and a tube 52 connected to the container 51.
  • the air in the container 51 and the pipe 52 constitutes a vibration system in which the air in the pipe 52 is the mass and the air in the container 51 is a spring. Therefore, the Helmholtz resonator 50 increases the sound pressure at the resonance frequency of this vibration system. Further, the Helmholtz resonator 50 lowers the sound pressure in a band higher than a predetermined value from the resonance frequency of this vibration system.
  • the resonance frequency f 0 of the Helmholtz resonator 50 is expressed by the following equation (1). It is represented by.
  • the resonance frequency f 0 of the Helmholtz resonator 50 can be adjusted according to the volume V, the cross-sectional area s, and the length l. Specifically, the smaller the volume V or length l, or the larger the cross-sectional area s, the larger the resonance frequency f 0 .
  • the space S1 corresponds to the space inside the container 51 described above.
  • the opening 41 of the acoustic member 40 corresponds to the above-mentioned pipe 52. Therefore, the length of the opening 41 along the Z axis corresponds to the above-mentioned length l. Therefore, the desired resonance frequency f 0 can be adjusted according to the cross-sectional area or length of the opening 41. Further, the resonance frequency f 0 can be selected by preparing a plurality of acoustic members 40 having different cross-sectional areas or lengths of the openings 41 and exchanging the acoustic members 40 attached to the cabinet 30.
  • FIG. 4 is a graph showing the frequency characteristics of the sound from the speaker 10.
  • the characteristics of the speaker 10 having the acoustic member 40 are shown by a solid line, and the characteristics when the acoustic member 40 is omitted from the speaker 10 are shown by a broken line.
  • FIG. 4 shows a case where the frequency band of the audio signal is in the range of 0.3 KHz or more and 3.4 KHz or less.
  • the resonance frequency f 0 of the Helmholtz resonator described above is near the upper limit of the frequency band of the audio signal.
  • the components in the frequency band of the audio signal are enhanced and the components exceeding the frequency band of the audio signal are attenuated as compared with the case where the acoustic member 40 is not used.
  • the resonance frequency f 0 is a frequency exceeding the frequency band of the audio signal, but the frequency is not limited to this, and the resonance frequency f 0 may be a frequency within the frequency band of the audio signal. However, from the viewpoint that the S / N ratio can be easily and effectively increased , it is preferable that the resonance frequency f 0 is a frequency higher than the center frequency in the frequency band of the audio signal.
  • FIG. 5 of the acoustic member 40 is a plan view of the acoustic member 40 according to the first embodiment.
  • FIG. 6 is a cross-sectional view taken along the line A1-A1 in FIG.
  • the acoustic member 40 has a substantially circular outer shape in a plan view.
  • four protrusions 42 are provided on the outer circumference of the acoustic member 40. Therefore, by fitting the shape of the opening 32 of the cabinet 30 to the outer periphery of the acoustic member 40, it is possible to prevent the acoustic member 40 from being displaced with respect to the cabinet 30 in the circumferential direction.
  • the shape, position, number, and the like of the protrusions 42 are not limited to the example shown in FIG. 5, and are arbitrary. Further, the protrusion 42 may be provided as needed, or may be omitted.
  • the acoustic member 40 has a plate shape as described above, and has an opening 41 penetrating in the thickness direction.
  • the number of openings 41 included in the acoustic member 40 is one.
  • the opening 41 of the acoustic member 40 has a circular shape including the central PC of the sound emitting surface 21a in a plan view.
  • the plan view shape of the opening 41 is not limited to a circle, and may be, for example, a polygon such as a triangle, a quadrangle, a pentagon or a hexagon, or a slit shape, a star shape or an ellipse shape.
  • the thickness of the acoustic member 40 includes a first portion 43 having a constant thickness and a second portion 44 thicker than the first portion 43.
  • the first portion 43 is an annular portion along the outer circumference of the acoustic member 40.
  • the thickness of the first portion 43 is constant at the thickness t1.
  • a convex portion 45 extending along the circumferential direction of the acoustic member 40 is provided on the surface of the first portion 43 facing the Z2 direction.
  • the convex portion 45 comes into contact with the wall surface of the opening 32 of the cabinet 30. Therefore, the misalignment of the acoustic member 40 with respect to the cabinet 30 is prevented.
  • the convex portion 45 may be provided as needed or may be omitted.
  • the second part 44 is a part inside the first part 43 of the acoustic member 40.
  • the thickness of the second portion 44 changes from the thickness t1 to the thickness t2 from the outside to the inside in the radial direction of the acoustic member 40.
  • the thickness of the second portion 44 changes continuously from the outside to the inside in the radial direction of the acoustic member 40.
  • the thickness of the second portion 44 may change stepwise from the outside to the inside in the radial direction of the acoustic member 40.
  • the second portion 44 is provided with an opening 41. Therefore, the length l of the opening 41 is equal to the thickness t2 of the second portion 44.
  • the width of the opening 41 increases from the center of the opening 41 toward the Z1 direction and the Z2 direction. Therefore, the loss of sound in the opening 41 is reduced as compared with the case where the width of the opening 41 is constant.
  • the width of the opening 41 may be constant.
  • the speaker 10 has a diaphragm 21, a drive unit 22, and an acoustic member 40.
  • the diaphragm 21 has a sound emitting surface 21a that emits sound.
  • the drive unit 22 drives the diaphragm 21 based on an audio signal indicating a voice limited to a predetermined frequency band.
  • the acoustic member 40 has one opening 41, and is arranged so as to form a space S1 constituting the Helmholtz resonator together with the one opening 41 with the sound emitting surface 21a.
  • the Helmholtz resonator enhances the frequency components of the sound from the sound emitting surface 21a within the predetermined frequency band, and attenuates the components exceeding the predetermined frequency band.
  • the components within the predetermined frequency band of the audio signal are enhanced. Therefore, even in an environment where there is an obstacle in front of the speaker 10, it is possible to reduce the volume decrease in the predetermined frequency band. Moreover, among the frequency components of the sound from the sound emitting surface 21a, the components exceeding a predetermined frequency band of the audio signal are attenuated. Therefore, the sound generated by the harmonic distortion of the speaker 10 can be reduced. From the above, since the S / N ratio is improved, it is possible to make it easier to hear the sound from the speaker 10 even in an environment where there is an obstacle in front of the speaker 10.
  • the speaker 10 has a sound emitting unit 20, a cabinet 30, and a plate-shaped acoustic member 40.
  • the sound emitting unit 20 includes a cone-shaped diaphragm 21 having a sound emitting surface 21a for emitting sound.
  • the sound emitting unit 20 is attached to the cabinet 30 with the sound emitting surface 21a exposed to the external space.
  • the acoustic member 40 is attached to the cabinet 30 in a state where the space S1 constituting the Helmholtz resonator is arranged between the sound emitting surface 21a and the sound emitting surface 21a together with one opening 41.
  • the diaphragm 21 of the present embodiment is a cone type. Therefore, the acoustic member 40 can be configured by using a plate-shaped member or the like. Therefore, it is not necessary for the acoustic member 40 to have a complicated shape or to separately prepare a member such as a spacer for securing the required size of the space S1. Further, the size of the speaker 10 can be reduced.
  • the acoustic member 40 of this embodiment is a plate-shaped lid member. Therefore, as compared with the case where the shape of the acoustic member 40 is a complicated shape such as a box shape, the manufacturing and mounting of the acoustic member 40 can be facilitated.
  • the thickness of the acoustic member 40 increases toward the opening 41. Therefore, the neck length l of the Helmholtz resonator can be lengthened by utilizing the plate thickness of the acoustic member 40. As a result, the acoustic member 40 can be easily manufactured. Further, since the thickness of the outer peripheral portion of the acoustic member 40 used for attachment is reduced, the configuration relating to the attachment of the acoustic member 40 is simplified.
  • the opening 41 is one opening including the central PC of the diaphragm 21 when viewed from the direction in which the acoustic member 40 and the diaphragm 21 overlap (Z1 direction or Z2 direction). Therefore, it is easy to increase the cross-sectional area of the openings 41 as compared with the case where the acoustic member 40 is provided with a plurality of openings. Therefore, there is an advantage that the resonance frequency f 0 of the Helmholtz resonator can be easily increased.
  • FIG. 7 is a plan view of the acoustic member 40A in the second embodiment.
  • FIG. 8 is a cross-sectional view taken along the line A2-A2 in FIG.
  • the acoustic member 40A is the same as the acoustic member 40A of the first embodiment described above, except that it has a plurality of openings 41A instead of one opening 41 and the thickness is different.
  • the acoustic member 40A has a plurality of openings 41A.
  • the plurality of openings 41A form a Helmholtz resonator together with the space S1 between the acoustic member 40A and the sound emitting surface 21a described above.
  • the total cross-sectional area of the plurality of openings 41A corresponds to the above-mentioned cross-sectional area s.
  • each opening 41A is regularly arranged in a staggered pattern. Further, each opening 41A has a circular shape in a plan view.
  • the arrangement of the plurality of openings 41A may be another regular arrangement such as a matrix, or may be random. However, when the arrangement of the plurality of openings 41A is regular, the design of the acoustic member 40A is easier than when the arrangement of the plurality of openings 41A is random.
  • the plan view shape of each opening 41A is not limited to a circle, and may be, for example, a polygon such as a triangle, a quadrangle, a pentagon or a hexagon, or a slit shape, a star shape or an ellipse shape.
  • the number of openings 41A is not limited to the number shown in FIG. 7, and is arbitrary. Further, the sizes of the plurality of openings 41A may be different from each other.
  • recesses 46 and 47 are provided on the surface of the acoustic member 40A facing the Z2 direction. Therefore, the volume of the space S1 can be increased as compared with the case where the recesses 46 and 47 are omitted. Further, the length of each opening 41A along the Z axis can be reduced.
  • the width W1 of the recess 46 is larger than the width W2 of the recess 47.
  • the wall portion 45A surrounding the concave portion 46 prevents the acoustic member 40 from being displaced with respect to the cabinet 30 as in the case of the convex portion 45 described above.
  • each opening 41A can be sized so that a finger or the like cannot enter. Therefore, it is possible to reduce damage to the diaphragm 21 when the acoustic member 40A is installed.
  • FIG. 9 is a conceptual diagram for explaining a case where the speaker 10 is installed in the listening space S2 and the space S3 separated by the shield 200.
  • the listening space S2 is a space in which the user U exists.
  • Space S3 is a space in which the speaker 10 is installed.
  • the shield 200 is a structure that separates the listening space S2 and the space S3. In the example shown in FIG. 9, the shield 200 has a shape surrounding the space S3. Further, the shield 200 is provided with a plurality of holes 201.
  • the sound from the speaker 10 is transmitted from the space S3 to the listening space S2 through each hole 201.
  • the shield 200 it may not be possible to arrange the hole 201 in front of the speaker 10. Even in this case, since the sound pressure is adjusted by the Helmholtz resonator in the speaker 10 as described above, the user U can easily hear the sound from the speaker 10.
  • FIG. 10 is a diagram for explaining a case where the speaker 10 is installed in the vehicle 100.
  • FIG. 10 shows a case where the speaker 10 is installed inside the instrument panel 101 of the vehicle 100.
  • the vehicle 100 having the speaker 10 in this way, even if the speaker 10 is arranged inside the instrument panel 101, the sound from the speaker 10 can be easily heard. Therefore, since the degree of freedom in designing the instrument panel 101 is increased, it is possible to provide the vehicle 100 having excellent design.
  • the acoustic member 40 or 40A has a plate shape is exemplified, but the present invention is not limited to this example.
  • the acoustic member may be in the shape of a tray.
  • the acoustic member 40 or 40A is separate from the cabinet 30, but the present invention is not limited to this, and the acoustic member 40 or 40A may be integrated with the cabinet 30.
  • the speaker drives the vibrating plate based on a vibrating plate having a sound emitting surface for emitting sound and an audio signal indicating sound limited to a predetermined frequency band.
  • a driving unit and an acoustic member having at least one opening and arranged so as to form a space forming a Helmholtz resonator together with the at least one opening between the sound emitting surface and the sound emitting surface. Then, the Helmholtz resonator enhances the frequency component of the sound from the sound emitting surface within the predetermined frequency band and attenuates the component exceeding the predetermined frequency band.
  • the components within the predetermined frequency band of the audio signal are enhanced. Therefore, even in an environment where there is an obstacle in front of the speaker, it is possible to reduce the volume decrease in the predetermined frequency band. Moreover, among the frequency components of the sound from the sound emitting surface, the components exceeding a predetermined frequency band of the audio signal are attenuated. Therefore, it is possible to reduce the sound generated by the harmonic distortion of the speaker. From the above, since the S / N ratio is improved, it is possible to make it easier to hear the sound from the speaker even in an environment where there is an obstacle in front of the speaker.
  • the diaphragm is a cone type.
  • the acoustic member can be configured by using a member such as a plate. Therefore, it is not necessary for the acoustic member to have a complicated shape or to separately prepare a member such as a spacer for securing the required size of the space. In addition, the size of the speaker can be reduced.
  • the acoustic member is a plate-shaped lid member. According to the above aspects, the manufacturing and mounting of the acoustic member becomes easier than in the case where the shape of the acoustic member is a complicated shape such as a box shape.
  • the thickness of the acoustic member increases toward at least one opening.
  • the neck length of the Helmholtz resonator can be increased by utilizing the plate thickness of the acoustic member.
  • the manufacturing of the acoustic member becomes easy.
  • the thickness of the outer peripheral portion of the acoustic member used for attachment can be reduced, and as a result, the configuration related to the attachment of the acoustic member is simplified.
  • the at least one opening includes the center of the diaphragm when viewed from the direction in which the acoustic member and the diaphragm overlap. It is one opening. According to the above aspect, it is easy to increase the cross-sectional area of the openings as compared with the case where the number of openings is a plurality. Therefore, there is an advantage that the resonance frequency of the Helmholtz resonator can be easily increased.
  • the at least one opening is a plurality of openings.
  • the opening can be sized so that a finger or the like cannot enter. Therefore, damage to the diaphragm at the time of installation of the acoustic member can be reduced.
  • the speaker according to a preferred embodiment (seventh aspect) of the present invention includes a sound emitting unit including a cone-shaped diaphragm having a sound emitting surface for emitting sound, and the sound emitting surface in a state of being exposed to an external space. It has a cabinet to which the sound emitting unit is mounted and a plate-shaped acoustic member having at least one opening and being attached to the cabinet, the acoustic member having a Helmholtz resonator together with the at least one opening. It is arranged so as to form a space to be formed between the sound emitting surface and the sound emitting surface.
  • the Helmholtz resonator enhances the frequency component of the sound from the sound emitting surface within a predetermined frequency band of the audio signal, and attenuates the component exceeding the predetermined frequency band. be able to. Therefore, since the S / N ratio is improved as in the first aspect described above, it is possible to easily hear the sound from the speaker even in an environment where there is an obstacle in front of the speaker.
  • the resonance frequency of the Helmholtz resonator is in the range of 2 KHz or more and 5 KHz or less. According to the above aspect, since the S / N ratio is improved, the sound from the speaker becomes easier to hear.
  • the vehicle according to the preferred aspect (9th aspect) of the present invention has the speaker of any of the above-mentioned aspects. According to the above aspect, even if the speaker is arranged inside the panel such as the instrument panel or the head console, the sound from the speaker can be easily heard. Therefore, it is possible to provide a vehicle having excellent design.
  • the speaker is installed in a space separated from the listening space by a shield. According to the above aspect, since the sound from the speaker is attenuated by the shield and then heard in the listening space, the effect obtained by applying the present invention is remarkable.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

Un haut-parleur comprend : une plaque vibrante ayant une surface d'émission de son qui émet un son ; une unité d'entraînement qui entraîne la plaque vibrante sur la base d'un signal audio indiquant un audio limité à une bande de fréquence prescrite ; et un élément acoustique qui a au moins une partie d'ouverture et est positionné de façon à former, conjointement avec la surface d'émission de son, un espace constituant un résonateur de Helmholtz conjointement avec ladite au moins une partie d'ouverture. Le résonateur de Helmholtz améliore les composants qui, parmi les composantes de fréquence du son provenant de la surface d'émission de son, se trouvent à l'intérieur de ladite bande de fréquence prescrite, et atténue les composants dépassant ladite bande de fréquence prescrite.
PCT/JP2020/045865 2019-12-25 2020-12-09 Haut-parleur et véhicule WO2021131705A1 (fr)

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JP2019-234223 2019-12-25
JP2019234223A JP2021103844A (ja) 2019-12-25 2019-12-25 スピーカーおよび車両

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024072790A1 (fr) * 2022-09-28 2024-04-04 SimpliSafe, Inc. Dispositif de haut-parleur
WO2024072534A1 (fr) * 2022-09-28 2024-04-04 SimpliSafe, Inc. Dispositif de haut-parleur

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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