EP4224882A1 - Vehicle sound emitter - Google Patents

Vehicle sound emitter Download PDF

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Publication number
EP4224882A1
EP4224882A1 EP21875555.1A EP21875555A EP4224882A1 EP 4224882 A1 EP4224882 A1 EP 4224882A1 EP 21875555 A EP21875555 A EP 21875555A EP 4224882 A1 EP4224882 A1 EP 4224882A1
Authority
EP
European Patent Office
Prior art keywords
ports
diaphragm
vehicle sound
portions
case
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP21875555.1A
Other languages
German (de)
English (en)
French (fr)
Inventor
Shuya OZEKI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Foster Electric Co Ltd
Original Assignee
Foster Electric Co Ltd
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 Foster Electric Co Ltd filed Critical Foster Electric Co Ltd
Publication of EP4224882A1 publication Critical patent/EP4224882A1/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2838—Enclosures comprising vibrating or resonating arrangements of the bandpass type
    • H04R1/2846—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
    • H04R1/2849—Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers
    • 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
    • H04R1/023—Screens for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles

Definitions

  • the present invention relates to a vehicle sound-generator.
  • JP-A Japanese Patent Application Laid-Open ( JP-A) No. H9-327082 discloses an in-vehicle speaker device in which a grill (protector) is attached to a front opening of a speaker box.
  • the grill of the speaker device includes ribs extending in a substantially horizontal direction and shielding portions integrally formed with the ribs.
  • the shape of the sound emitting holes of the grill as seen in a front view is, for example, longer in the horizontal direction at vertical direction central regions than regions at vertical direction ends, and the plural sound emitting holes do not have the same resonance frequency as each other, and therefore, there is room for improvement in terms of ensuring acoustic performance.
  • Japanese Patent No. 6337669 has a complicated structure, which may lead to an increase in the size of the device.
  • the present disclosure provides a vehicle sound-generator that can ensure acoustic performance with a compact configuration while preventing or effectively suppressing direct water exposure to the diaphragm of the speaker.
  • a vehicle sound-generator includes: a speaker that causes a diaphragm to vibrate and generates a sound; a case portion that houses the speaker and forms a rear chamber at a rear side with respect to the diaphragm, the case portion being separated from the diaphragm to a front side with respect to the diaphragm and being formed with an opening therethrough; and a protector that is attached to the opening and that, together with the case portion, forms a front chamber at the front side with respect to the diaphragm, plural ports, each of which forms a flow channel for gas inside and outside the front chamber, being formed at the protector.
  • Shielding portions are formed at each of the plural ports, the shielding portions shielding, as seen in a front view from in front of the ports, an area that overlaps with each flow channel of the ports at the front chamber, and the plural ports having the same resonance frequency as each other.
  • the speaker causes the diaphragm to vibrate and generates a sound.
  • the rear chamber is formed by the case portion at the rear side with respect to the diaphragm
  • the front chamber is formed by the case portion and the protector at the front side with respect to the diaphragm.
  • the protector is formed with plural ports, each of which forms a flow channel for gas inside and outside the front chamber, at the front side with respect to the diaphragm.
  • Shielding portions are formed at each of plural ports, the shielding portions shielding, as seen in a front view from in front of the ports, an area that overlaps with each flow channel of the ports at the front chamber. Therefore, the shielding portions can prevent or effectively suppress water that is traveling in a straight line, from the front side of the ports toward the front chamber side, from directly entering into the front chamber.
  • the plural ports have the same resonance frequency as each other. As a result, since the target frequency band can be specified and the acoustic performance can be adjusted, the sound pressure level in the target frequency band can be reliably increased. In addition, since the structure is such that the acoustic performance is ensured by using the front chamber and the ports, an increase in size of the vehicle sound-generator can be suppressed.
  • a vehicle sound-generator according to a second aspect of the present disclosure is the vehicle sound-generator according to the first aspect, wherein a shape of each of the plural ports is the same or the ports are symmetrical with respect to a virtual line through a center of the protector in a front-rear direction.
  • a vehicle sound-generator is the vehicle sound-generator according to the first aspect or the second aspect, wherein each of the plural ports includes: a flat plate portion that is disposed at the protector so as to face the diaphragm; an inner rib portion that protrudes from the flat plate portion toward a diaphragm side and forms a part of the flow channel: and an outer component portion that protrudes from the flat plate portion toward a side opposite from the diaphragm side and forms a part of the flow channel.
  • each of the ports since each of the ports includes an inner rib portion and an outer component portion, the length of the flow channel of each of the ports is ensured while the amount of protrusion to outside of the ports is suppressed. As a result, desired acoustic performance can be obtained while further suppressing an increase in the size of the vehicle sound generator.
  • a vehicle sound-generator according to a fourth aspect of the present disclosure is the vehicle sound-generator according to the third aspect, wherein: outer component portions of the plural ports respectively include L-shaped bent wall portions; and the shielding portions are formed at the bent wall portions.
  • the shielding portions are formed at the bent wall portions of the outer component portions at the front side of the ports, water that is traveling in a straight line, from the front side of the ports toward the front chamber side, can be more effectively suppressed from directly entering into the front chamber.
  • a vehicle sound-generator according to a fifth aspect of the present disclosure is the vehicle sound-generator according to any one the first aspect to the fourth aspect, wherein, at openings at both ends of the respective ports, chamfered portions which are R-shaped from an opening end towards a port inner side are formed.
  • a vehicle sound-generator is the vehicle sound-generator according to any one the first aspect to the fifth aspect, wherein: the ports respectively include at least one bent portion between one end and another end of the flow channel; and R-shaped curved surface portions are formed at at least one corner portion of bent portions at a flow channel inner surface of the respective ports.
  • a vehicle sound-generator according to a seventh aspect of the present disclosure is the vehicle sound-generator according to the sixth aspect, wherein the curved surface portions are formed only at corner portions that are concave among the corner portions.
  • a vehicle sound-generator according to an eighth aspect of the present disclosure is the vehicle sound-generator according to any one the first aspect to the seventh aspect, wherein an orientation of each of the openings at both ends of all of the ports is aligned with a sound emission direction of the diaphragm.
  • a vehicle sound-generator is the vehicle sound-generator according to any one the first aspect to the eighth aspect, wherein: the case portion includes a first case portion that, together with the protector, forms the front chamber, and includes a second case portion that is joined to the first case portion and that, together with a part of the first case portion, forms the rear chamber; and the first case portion and a frame portion that supports the speaker are integrally formed to constitute a frame with a case.
  • the frame portion and the first case portion are integrally formed, and therefore, it is possible to prevent the occurrence of a situation such as water entering from a gap between the frame portion and the first case.
  • a vehicle sound-generator is the vehicle sound-generator according to the ninth aspect, wherein: at the frame with a case, a connector portion is formed at the first case portion; and a terminal is insert-molded at the connector portion, one end of the terminal being exposed from the connector portion, and another end of the terminal being exposed from the frame portion and being connected to the speaker.
  • the terminal is insert-molded in the frame with a case, one end of the terminal is exposed at the connector portion formed at the first case portion, and the other end of the terminal is exposed from the frame portion and connected to the speaker. Since this eliminates the need for wiring holes, it is possible to prevent the occurrence of a situation such as water entering from wiring holes.
  • the vehicle sound-generator of the present disclosure has the excellent effect of achieving a compact configuration that can ensure acoustic performance while preventing or effectively suppressing the diaphragm of the speaker from being directly exposed to water.
  • Fig. 1 illustrates a perspective view of a vehicle sound-generator 10 according to an exemplary embodiment of the present disclosure. Further, Fig. 2 shows a perspective view of a state along line 2-2 in Fig. 1 .
  • the vehicle sound-generator 10 is attached to the front/rear of an electric vehicle (for example, an electric automobile, a hybrid vehicle or the like), and automatically generates a sound to inform pedestrians and the like that the electric vehicle is approaching when the electric vehicle is traveling at low speed.
  • an electric vehicle for example, an electric automobile, a hybrid vehicle or the like
  • the vehicle sound-generator 10 includes a speaker 20 that causes a diaphragm 22 to vibrate and generates sound, and a case portion 30 that houses the speaker 20.
  • a rear chamber 14 is formed at a rear side with respect to the diaphragm 22 of the case portion 30.
  • a through opening 32A is formed with being separated from the diaphragm 22 to a front side at the case portion 30.
  • a protector 40 is attached to the opening 32A of the case portion 30.
  • the protector 40 is disposed so as to cover the opening 32A of the case portion 30 and forms, together with the case portion 30, a front chamber 12 at the front side with respect to the diaphragm 22.
  • the protector 40 is formed with a flat plate portion 42 that is disposed facing the diaphragm 22, and with plural ports 50 that form flow channels A for gas inside and outside of the front chamber 12. Note that the ports 50 are elements that can be understood as sound emitting holes.
  • the diaphragm 22 of the speaker 20 is formed in an annular shape as seen in a front view, and a front side of the diaphragm 22 is curved in a concave shape.
  • resin materials such as polyetherimide (PEI), polyimide (PI), and polycarbonate (PC) can be used, and also, for example, metal materials such as aluminum alloys, and paper making materials such as pulp fibers can be used.
  • a diameter (an outer diameter) of the diaphragm 22 is, as an example, 80 mm.
  • the edge 23 is formed in an annular shape as seen in a front view, and is joined to a shelf portion 24A of a frame portion 24 over the entire circumference.
  • the frame portion 24 is a component that supports the speaker 20.
  • the frame portion 24 includes an annular bottom wall portion 24B disposed at the rear side of the diaphragm 22, and a connecting portion 24C that connects an outer periphery of the bottom wall portion 24B and an inner periphery of the shelf portion 24A.
  • the connecting portion 24C includes an intermediate shelf portion 24C 1 that is connected to the outer periphery of the bottom wall portion 24B via a stepped portion, and connecting wall portions 24C2 that connect an outer periphery of the intermediate shelf portion 24C1 and the inner periphery of the shelf portion 24A.
  • the connecting wall portions 24C2 are provided so as to be spaced apart in a circumferential direction of the frame portion 24 (see Fig. 5 ).
  • the voice coil 25 includes a bobbin 25A, which is a film made to be in a cylindrical shape, and the electric wire coil 25B that is formed by winding an electric wire around an outer periphery of the bobbin 25A.
  • the bobbin 25A extends through the opening of the bottom wall portion 24B of the frame portion 24, and one end of the bobbin 25A is disposed near the center cap 21 and connected to an inner periphery of the diaphragm 22.
  • a damper 26 is arranged at an outer peripheral side of an intermediate portion in a cylinder axis direction of the bobbin 25A.
  • the damper 26 is a flexible thin plate member formed in an annular shape as seen in a front view and has a wave-like corrugated plate portion.
  • An inner periphery of the damper 26 is joined to the outer periphery of the bobbin 25A.
  • An outer periphery of the damper 26 is joined to the intermediate shelf portion 24C1 of the frame portion 24.
  • the voice coil 25 is connected to the frame portion 24 via the diaphragm 22 and the edge 23, and is connected to the frame portion 24 via the damper 26, such that the voice coil 25 is supported in a state in which the voice coil 25 can vibrate along the cylinder axis direction of the bobbin 25A.
  • a pole portion 27A of a yoke 27 is inserted from a side opposite from a center cap 21 side.
  • the yoke 27 is made from a ferromagnetic material.
  • the yoke 27 includes a plate portion 27B that projects out from an end of the pole portion 27A which is opposite from the center cap 21 side.
  • the magnet 28 is formed in an annular shape, is disposed adjacent to an outer peripheral side of the pole portion 27A of the yoke 27 with a space therebetween, and is disposed on the plate portion 27B.
  • the plate 29 is formed in an annular shape from a ferromagnetic material, is disposed adjacent to an outer peripheral side of the bobbin 25A with a space therebetween, and is disposed between the bottom wall portion 24B of the frame portion 24 and the magnet 28.
  • the case portion 30 that houses the speaker 20 includes a first case portion 32 that, together with the protector 40, forms the front chamber 12, and a second case portion 34 that is joined to the first case portion 32 and that, together with a part of the first case portion 32, forms the rear chamber 14.
  • first case portion 32 may be referred to as an upper case portion
  • second case portion 34 may be referred to as a lower case portion.
  • the second case portion 34 includes a bottom wall portion 34A and a peripheral wall portion 34B that is installed upright from an outer peripheral end portion of the bottom wall portion 34A.
  • a projecting-out portion 34C that projects out like a flange is formed at an open end side of the peripheral wall portion 34B.
  • a ventilation hole 34H is formed through the projecting-out portion 34C.
  • the ventilation hole 34H is covered with a material for air pressure control (for example, Gore-Tex (registered trademark)).
  • the material for air pressure control is waterproof and breathable, and suppresses volumetric expansion of the rear chamber 14. By suppressing volumetric expansion of the rear chamber 14, the diaphragm 22 is prevented from being damaged.
  • a groove shaped insertion receiving portion 34D into which a rear-side end portion 32B of the first case portion 32 (an end portion at an opposite side from the above-described opening 32A) is inserted, is formed over the entire circumference at a projecting out direction end portion of the projecting-out portion 34C of the second case portion 34.
  • an engagement protrusion 34E (see the right side of Fig. 2 ) is formed at a part of an outer wall portion of the insertion receiving portion 34D, and an engagement portion 32C that engages the engagement protrusion 34E is formed at a rear side portion of the first case portion 32.
  • Fig. 5 illustrates a perspective view of the frame 38 with a case.
  • a terminal placement wall portion 24D that is contiguous with a rear surface of the shelf portion 24A of the frame portion 24 is formed.
  • Terminals T1 and T2 are insert-molded in the frame 38 with a case. One end T1A and one end T2A of the terminals T1 and T2 are exposed at the connector portion 32D.
  • Another end T1B and another end T2B of the terminals T1 and T2 are exposed from the terminal placement wall portion 24D of the frame portion 24 and connected to the speaker 20 (see Fig. 2 ). That is, the other ends T1B and T2B of the terminals T1 and T2 are connected to a portion of an electric wire (not shown) extending from the electric wire coil 25B of the voice coil 25 of the speaker 20 illustrated in Fig. 2 .
  • Fig. 3 illustrates a front view of the protector 40
  • Fig. 4 illustrates an enlarged cross-sectional view of part of the protector 40 illustrated in Fig. 2 .
  • the protector 40 is formed in a substantially circular shape as seen in a front view, and is formed with a number of ribs.
  • a total of ten ports 50 are formed at the protector 40.
  • the shape of each of these ten ports 50 is the same, and the ports 50 are symmetrical with respect to a virtual line PL passing through the center of the protector 40 in the front-rear direction as shown in Fig. 4 , and these ten ports 50 have the same resonance frequency as each other.
  • the ports 50 have a narrow long hole shape from the point of view of preventing foreign matter such as pebbles from entering.
  • a specific size (opening area and flow channel length) of the ports 50 is appropriately set in accordance with a frequency band in which the sound pressure level is desired to be increased (in other words, a target frequency band).
  • a frequency band in which the sound pressure level is desired to be increased in other words, a target frequency band.
  • the target frequency band is 300 Hz to 1 kHz.
  • each port 50 is arranged with the same direction as a longitudinal direction.
  • a longitudinal direction of the ports 50 is defined as a first direction (the direction of the arrow X in the drawings), and as seen in a front view of the protector 40, a direction perpendicular to the longitudinal direction of the ports 50 is a second direction (the direction of the arrow Y in the drawings).
  • the plural ports 50 are formed so as to be symmetrical with respect to a first virtual center line CL1 that indicates a central position of the protector 40 in the first direction (the direction of the arrow X). Further, the plural ports 50 are formed so as to be symmetrical with respect to a second virtual center line CL2 that indicates a central position of the protector 40 in the second direction (the direction of the arrow Y). Two ports 50 are arranged in series in the first direction (the direction of the arrow X) at an intermediate portion of the protector 40 in the second direction (the direction of the arrow Y), and four ports 50 are arranged in series in the second direction (the direction of the arrow Y). In addition, one port 50 is formed at a central portion in the first direction (the direction of the arrow X) at each of the portions of the protector 40 at both end sides in the second direction (the direction of the arrow Y).
  • each of the openings 50A and 50B at both ends of all of the ports 50 illustrated in Fig. 4 is aligned with a sound emission direction (the same direction as the direction of the arrow FR) of the diaphragm 22 (see Fig. 2 ).
  • R-shaped chamfered portions R1 and R2 are formed at the openings 50A and 50B at both ends of the ports 50 and extend from the opening ends toward an inner side of the port.
  • the ports 50 are formed through the flat plate portion 42 of the protector 40, and each of the ports 50 includes an inner rib portion 52 formed at a front chamber 12 side with respect to the flat plate portion 42, a penetrating portion 54 that penetrates through the flat plate portion 42, and an outer component portion 56 formed at an outer side with respect to the flat plate portion 42.
  • the inner rib portion 52, the penetrating portion 54, and the outer component portion 56 form a part of the flow channel A, respectively. Further, at least one bent portion is formed between one end and another end of the flow channel A in each of the ports 50.
  • the inner rib portion 52 is formed in a rectangular tubular shape protruding from the flat plate portion 42 toward the diaphragm 22 (see Fig. 2 ) in a direction perpendicular to a direction of the surface of the flat plate portion 42.
  • the penetrating portion 54 is formed so as to extend the flow channel at an inner rib portion 52 side.
  • the outer component portion 56 is formed so that the flow channel becomes L-shaped. Specifically, as illustrated in the partially enlarged view of Fig.
  • the outer component portion 56 includes: a bent wall portion 56A that stands upright from a portion overlapping with one side wall portion 52A of the inner rib portion 52 at the flat plate portion 42 as seen in a front view, and that is bent in a reverse L shape so as to cover the penetrating portion 54; and an upright rib portion 56B that stands upright from a portion at an opposite side from a penetrating portion 54 side as seen in a front view, with respect to another side wall portion 52B of the inner rib portion 52.
  • an L-shaped bent portion is formed by the bent wall portion 56A, and an inverted L-shaped bent portion is formed by 58B, that is a portion of the flat plate portion 42, and the upright rib portion 56B, which face the bent wall portion 56A.
  • shielding portions 58A and 58B are formed at an area that overlaps with the flow channel A of the port 50 and that faces the front chamber 12, and the shielding portions 58A and 58B partially shield the port 50.
  • a length of the shielding portions 58A and 58B in the second direction (the direction of the arrow Y) and a length of each of the openings 50A and 50B at both ends of each of the ports 50 in the second direction (the direction of the arrow Y) are set to be of an equal length.
  • the amount of protrusion of the upright rib portion 56B from the flat plate portion 42 and the amount of protrusion of the bent wall portion 56A from the flat plate portion 42 are set to be an equal amount of protrusion.
  • R-shaped curved surface portions R3 and R4 are formed only at concave corner portions C2 and C4 among corner portions C 1, C2, C3, and C4 (hereinafter abbreviated to "corner portions C 1 to C4") at a flow channel inner surface of each of the ports 50. Note that among the corner portions C1 to C4, the convex corner portions C1 and C3 are right-angled corners.
  • the ports 50 of the present embodiment as described above have a structure that can be understood as a labyrinthine structure, and are set to a shape that can be easily molded with upper and lower molds.
  • the bobbin 25A causes the diaphragm 22 to vibrate by electromagnetic induction and generate sound.
  • the rear chamber 14 is formed by the case portion 30 at the rear side with respect to the diaphragm 22, and the front chamber 12 is formed by the case portion 30 and the protector 40 at the front side with respect to the diaphragm 22.
  • the protector 40 is formed with the plural ports 50, which form flow channels A for gas inside and outside the front chamber 12, at the front side with respect to the diaphragm 22.
  • shielding portions 58A and 58B are formed which shield an area that partly overlaps with the flow channel A at the front chamber 12. Therefore, the shielding portions 58A and 58B can prevent or effectively suppress water that is traveling in a straight line, from the front side of the ports 50 toward the front chamber 12 side, from directly entering into the front chamber 12. Further, as illustrated in Fig.
  • each of the ports 50 is provided with shielding portions 58A and 58B to form a flow channel A that is bent like a crank, even if high-pressure water were to enter into the ports 50, the water would zigzag through the ports 50, and as a result, the water pressure would be reduced. Therefore, even if high-pressure water enters the ports 50, damage to the diaphragm 22 can be greatly reduced.
  • the plural ports 50 have the same resonance frequency as each other.
  • the target frequency band can be specified and the acoustic performance can be adjusted, the sound pressure level of the target frequency band can be reliably increased.
  • the plural ports 50 have the same shape as each other, the design is easy.
  • the structure a Kelton-type enclosure structure ensures acoustic performance using the front chamber 12 and the ports 50, it is possible to suppress an increase in the size of the vehicle sound-generator 10.
  • Fig. 6 illustrates a curve that outlines the frequency-sound pressure level characteristics for the vehicle sound-generator 10 and for a comparative example.
  • the comparative example is a vehicle sound-generator without a protector (40) and without a front chamber (12).
  • the solid-line indicates the results of the vehicle sound-generator 10 of the present exemplary embodiment, and the alternate long and two short dashes line indicates the results of the comparative example.
  • the sound pressure level in the predetermined frequency band (300 Hz to 1 kHz) is not sufficiently increased.
  • the sound pressure level in the predetermined frequency band (300 Hz to 1 kHz) is raised to near the desired sound pressure level RL, indicating band-pass frequency characteristics.
  • each of the ports 50 includes the inner rib portion 52 that protrudes from the flat plate portion 42 toward the diaphragm 22 side (see Fig. 2 ) and forms a part of the flow channel A. Therefore, the length of the flow channel of each of the ports 50 is ensured while the amount of protrusion to outside of the ports 50 is suppressed. As a result, desired acoustic performance can be obtained while further suppressing an increase in the size of the vehicle sound-generator 10.
  • R-shaped chamfered portions R1 and R2 are formed at the openings 50A and 50B at both ends of each of the ports 50 and extend from the opening ends toward an inner side of the port, and R-shaped curved surface portions R3 and R4 are formed at predetermined corner portions C2 and C4 at the flow channel inner surface of each of the ports 50.
  • the above-described curved surface portions R3 and R4 are formed only at the concave corner portions C2 and C4 among the corner portions C1 to C4. Therefore, in a case in which high-pressure water enters obliquely from the openings 50B at the front side of the ports 50 so as to pass through the vicinity of the convex corners C1 and C3, it is easy to suppress the high-pressure water entering because the convex corners C1 and C3 are not curved surface portions (chamfered portions).
  • each of the openings 50A and 50B at both ends of all of the ports 50 is aligned with a sound emission direction (the same direction as the direction of the arrow FR) of the diaphragm 22 (see Fig. 2 ). Therefore, it is possible to increase the sound pressure level of the frequency band with high directivity.
  • the diaphragm 22 of the speaker 20 is prevented or effectively suppressed from being directly exposed to water, and acoustic performance can be ensured by a compact configuration.
  • the frame portion 24 and the first case portion 32 are integrally formed, and therefore, it is possible to prevent the occurrence of a situation such as water entering from a gap between the frame portion 24 and the first case 32.
  • terminals T1 and T2 illustrated in Fig. 5 are insert-molded in the frame 38 with a case, the one end T1A and the one end T2A of the terminals T1 and T2 are exposed at the connector portion 32D formed at the first case 32, and the other end T1B and the other end T2B of the terminals T1 and T2 are exposed from the frame portion 24 and connected to the speaker 20 (see Fig. 2 ). Since this eliminates the need for wiring holes, it is possible to prevent the occurrence of a situation such as water entering from wiring holes. In addition, wiring work can be eliminated.
  • the target frequency band is 300 Hz to 1 kHz
  • the target frequency band can be appropriately set within the range (160 Hz to 5 kHz) specified by the international standard (UN-R138).
  • the target frequency band of 300 Hz to 1 kHz for example, the size of the ports 50 and the like illustrated in Fig. 2 and the like is changed.
  • the opening area of the ports 50 is increased or the flow channel length of the flow channels A of the ports 50 is shortened.
  • the opening area of the ports 50 is reduced or the flow channel length of the flow channels A is lengthened.
  • the volume of the rear chamber 14 illustrated in Fig. 2 is increased. Further, in a case of increasing the lower limit frequency of the target frequency band (for example, in a case of setting the target frequency band to 400 Hz to 1 kHz), the volume of the rear chamber 14 is reduced.
  • the number of ports 50 is ten, the number of ports may also be set as appropriate. Note that in a case in which the number of ports is increased, air-blow noise can be reduced because the amount of air flowing through each port is reduced by the increased number of ports.
  • each of the plural ports 50 is substantially the same shape, as a modified example, a configuration in which the shape of each of the plural ports (50) is not the same but the plural ports (50) have the same resonance frequency as each other may also be adopted.
  • each of the ports 50 illustrated in Fig. 4 and the like includes the inner rib portion 52, as a modified example, a configuration in which each of the ports does not include an inner rib portion (52) may also be adopted.
  • each of the ports 50 includes the upright rib portion 56B at the outer component portion 56
  • a configuration in which each of the ports does not include an upright rib portion (56B) may also be adopted.
  • the amount of protrusion of the upright rib portion 56B from the flat plate portion 42 matches the amount of protrusion of the bent wall portion 56A from the flat plate portion 42
  • a configuration in which the amount of protrusion of an upright rib portion (56B) from a flat plate portion (42) does not match the amount of protrusion of a bent wall portion (56A) from a flat plate portion (42) may also be adopted.
  • R-shaped chamfered portions R1 and R2 are formed at the openings 50A and 50B at both ends of each of the ports 50, as a modified example, a configuration in which chamfered portions (R1 and R2) are not formed at one or both of the openings (50A, 50B) at ends of each of the ports (50) may also be adopted.
  • a configuration in which an R-shaped curved surface portion is formed only at one corner portion among the corner portions (C1 to C4) at a flow channel inner surface of a port (50) may also be adopted.
  • a configuration in which an R-shaped curved surface portion is formed at all of the corner portions (C1 to C4) may also be adopted.
  • a configuration in which an R-shaped curved surface portion is not formed at any of the corners portion (C1 to C4) may also be adopted.
  • the orientations of the openings 50A and 50B at both ends of all the ports 50 are aligned with the sound emission direction of the diaphragm 22 (see Fig. 2 ), for example, a configuration in which the orientations of openings (50A and 50B) at both ends of some of the ports (50) are not aligned with the sound emission direction of a diaphragm (22) may also be adopted.
  • terminals T1 and T2 are insert-molded in the frame 38 with a case, a configuration in which terminals are arranged by forming wiring holes through a frame (38) with a case can also be adopted.

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
EP21875555.1A 2020-09-29 2021-09-27 Vehicle sound emitter Pending EP4224882A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020163761 2020-09-29
PCT/JP2021/035469 WO2022071253A1 (ja) 2020-09-29 2021-09-27 車両用発音器

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JPS6232694U (ja) * 1985-08-12 1987-02-26
JPH09327082A (ja) 1996-06-07 1997-12-16 Matsushita Electric Ind Co Ltd スピーカ装置
JPH11155181A (ja) * 1997-11-21 1999-06-08 Matsushita Electric Ind Co Ltd 浴室用スピーカー取付装置
JP2012191382A (ja) * 2011-03-10 2012-10-04 Casio Comput Co Ltd 防水振動板および音響装置
JP6337669B2 (ja) 2014-07-23 2018-06-06 アンデン株式会社 車両用発音器
JP7126763B2 (ja) * 2018-12-10 2022-08-29 アルパイン株式会社 スピーカ

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