WO2023243379A1 - 音響信号出力装置 - Google Patents

音響信号出力装置 Download PDF

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Publication number
WO2023243379A1
WO2023243379A1 PCT/JP2023/019888 JP2023019888W WO2023243379A1 WO 2023243379 A1 WO2023243379 A1 WO 2023243379A1 JP 2023019888 W JP2023019888 W JP 2023019888W WO 2023243379 A1 WO2023243379 A1 WO 2023243379A1
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WO
WIPO (PCT)
Prior art keywords
acoustic signal
sound
sound hole
output device
region
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.)
Ceased
Application number
PCT/JP2023/019888
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
達也 加古
大将 千葉
潤 岩瀬
広明 佐藤
和則 小林
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.)
Ntt Sonority Inc
NTT Inc
Original Assignee
Ntt Sonority Inc
Nippon Telegraph and Telephone Corp
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 Ntt Sonority Inc, Nippon Telegraph and Telephone Corp filed Critical Ntt Sonority Inc
Priority to CN202380046498.2A priority Critical patent/CN119366198A/zh
Priority to JP2024528663A priority patent/JP7794971B2/ja
Priority to KR1020247040868A priority patent/KR102918138B1/ko
Priority to EP23823676.4A priority patent/EP4543038A1/en
Priority to US18/873,418 priority patent/US20250168557A1/en
Publication of WO2023243379A1 publication Critical patent/WO2023243379A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17821—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the input signals only
    • G10K11/17827—Desired external signals, e.g. pass-through audio such as music or speech
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers
    • H04R1/347—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers for obtaining a phase-shift between the front and back acoustic wave
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17885—General system configurations additionally using a desired external signal, e.g. pass-through audio such as music or speech
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1008—Earpieces of the supra-aural or circum-aural type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1058—Manufacture or assembly
    • H04R1/1075—Mountings of transducers in earphones or headphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/105—Earpiece supports, e.g. ear hooks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/11—Aspects relating to vents, e.g. shape, orientation, acoustic properties in ear tips of hearing devices to prevent occlusion

Definitions

  • the present invention relates to an acoustic signal output device, and particularly to an acoustic signal output device that does not seal the ear canal.
  • open-ear earphones and headphones have the problem of large sound leakage to the surroundings. Such a problem is not limited to open-ear earphones or headphones, but is a problem common to audio signal output devices that do not seal the ear canal.
  • the present invention has been made in view of these points, and it is an object of the present invention to provide an acoustic signal output device that does not seal the ear canal and can suppress sound leakage to the surroundings.
  • the present invention includes a single or plural first sound holes that emit a first acoustic signal to the outside, and a single or plurality of second sound holes that emit a second acoustic signal to the outside.
  • An acoustic signal output device is provided having a structure provided therein.
  • the first sound hole is arranged at an eccentric position shifted in a first direction from the central axis of the structure, and the sound pressure level of the second acoustic signal emitted from the second sound hole into the first space is set. is lower than the sound pressure level of the second acoustic signal emitted from the second sound hole into the second space.
  • the first space is a space located in a first direction with respect to the first sound hole
  • the second space is a space located in a second direction with respect to the first sound hole.
  • the second direction includes a component in the opposite direction to the first direction.
  • the amount of attenuation of the first acoustic signal at the second point with respect to the first point is at least a predetermined value smaller than the attenuation rate at the first point.
  • the attenuation amount due to air propagation of the acoustic signal at the second point is designed to be greater than or equal to a predetermined value, which is larger than the attenuation amount due to air propagation at the second point.
  • FIG. 1 is a perspective view illustrating the configuration of an acoustic signal output device according to an embodiment.
  • FIG. 2A is a transparent plan view illustrating the configuration of the acoustic signal output device according to the embodiment.
  • FIG. 2B is a transparent front view illustrating the configuration of the acoustic signal output device according to the embodiment.
  • FIG. 3A is a 2BA-2BA end view of FIG. 2B.
  • FIG. 3B is a 2A-2A end view of FIG. 2A.
  • FIGS. 4A and 4B are conceptual diagrams illustrating the arrangement of sound holes.
  • FIG. 5 is a diagram illustrating a usage state of the acoustic signal output device of the embodiment.
  • FIG. 5 is a diagram illustrating a usage state of the acoustic signal output device of the embodiment.
  • FIG. 6A is a diagram illustrating a usage state of the acoustic signal output device of the embodiment.
  • FIG. 6B is a diagram illustrating conditions for observing the acoustic signal emitted from the acoustic signal output device of the embodiment.
  • FIG. 7 is a diagram illustrating the acoustic signal output device of the embodiment placed on a flat surface.
  • FIG. 8A is a front view for illustrating the arrangement of sound holes.
  • 8B and 8C are front views for illustrating the arrangement of sound holes.
  • 9A and 9B are conceptual diagrams illustrating the arrangement of sound holes.
  • FIGS. 10A and 10B are conceptual diagrams illustrating the arrangement of sound holes.
  • FIG. 11A is a 2BA-2BA end view of FIG. 2B.
  • FIG. 11B is a 2A-2A end view of FIG. 2A.
  • FIG. 12A is a 2BA-2BA end view of FIG. 2B.
  • FIG. 12B is a conceptual diagram illustrating a drive system for the acoustic signal output device according to the embodiment.
  • FIG. 13 is a graph illustrating an equal-loudness curve (ISO 226:2003 Acoustics - Normal equal-loudness-level contours).
  • FIG. 14A is a graph illustrating the relationship between the volume of the internal space of the housing and the resonant frequency.
  • FIG. 14B is a graph illustrating the sound pressure level when using an LPF (low-pass filter) (with LPF) and when not using LPF (without LPF).
  • LPF low-pass filter
  • FIG. 15 is a diagram illustrating a configuration for mounting the acoustic signal output device of the embodiment on the auricle.
  • FIG. 16 is a diagram illustrating a configuration in which the acoustic signal output device of the embodiment is provided on the temple of glasses.
  • FIG. 16A is a front view of the acoustic signal output device of the embodiment.
  • FIG. 16B is an enlarged transparent view of FIG. 16A.
  • FIG. 16C is an enlarged rear view of the acoustic signal output device of the embodiment.
  • FIG. 17 is a front view for illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 18A is a perspective view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 18B is a plan view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 19 is a plan view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 20A is a plan view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 20B is a right side view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 20C is a front view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 20D is a rear view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 20E is a front view illustrating a usage state of a modified example of the acoustic signal output device of the embodiment.
  • FIG. 21A is a perspective view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 21B is a perspective view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 21C is a perspective view illustrating a usage state of a modified example of the acoustic signal output device of the embodiment.
  • FIG. 22A is a front view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 22B is a rear view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 23A is a front view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 23B is a rear view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 23C is a front view illustrating a usage state of a modified example of the acoustic signal output device of the embodiment.
  • FIG. 24A is a plan view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 24B is a right side view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 24C is a front view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 24A is a plan view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 24B is a right side view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 24C is
  • FIG. 24D is a rear view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 24E is a front view illustrating a usage state of a modified example of the acoustic signal output device of the embodiment.
  • FIG. 25A is a plan view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 25B is a front view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 25C is a rear view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 25D is a front view illustrating a usage state of a modified example of the acoustic signal output device of the embodiment.
  • FIG. 26A is a plan view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 26B is a front view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 26C is a rear view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 26D is a front view illustrating a usage state of a modified example of the acoustic signal output device of the embodiment.
  • FIG. 27A is a left side view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 27B is a front view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 27C is a front view illustrating a usage state of a modified example of the acoustic signal output device of the embodiment.
  • FIG. 28A is a plan view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 28B is a right side view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 28C is a front view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 28D is a rear view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 28E is a front view illustrating a usage state of a modified example of the acoustic signal output device of the embodiment.
  • FIG. 28A is a plan view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 28B is a right side view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 29A is a conceptual diagram illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 29B is a perspective view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 30A is a front view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 30B is a left side view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 30C is a right side view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 31A is a front view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 31B is a left side view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 31C is a right side view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 32A is a front view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 32B is a rear view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 33 is a conceptual diagram illustrating a modification of the acoustic signal output device of the embodiment.
  • 34A and 34B are perspective views for illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 35 is a perspective view illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 36 is a diagram illustrating a state in which a modified example of the acoustic signal output device of the embodiment is mounted.
  • 37A and 37B are perspective views for illustrating a modification of the acoustic signal output device of the embodiment.
  • FIG. 38 is a diagram illustrating a state in which a modified example of the acoustic signal output device of the embodiment is mounted.
  • 39A and 39B are perspective views for illustrating a modification of the acoustic signal output device of the embodiment.
  • 40A to 40C are partially enlarged views illustrating a modification of the acoustic signal output device of the embodiment.
  • the audio signal output device 10 of this embodiment is an audio listening device (for example, open-ear earphones, headphones, etc.) that is worn without sealing the user's ear canal.
  • an audio listening device for example, open-ear earphones, headphones, etc.
  • a driver unit 11 that outputs the converted image
  • a housing 12 that houses the driver unit 11
  • a support part 13 structural part
  • the driver unit (speaker driver unit) 11 emits (sounds) an acoustic signal AC1 (first acoustic signal) based on the input output signal to one side (direction D1), and emits an opposite phase signal ( This is a device (a device with a speaker function) that emits an acoustic signal AC2 (second acoustic signal), which is an approximation signal of a phase-inverted signal) or an anti-phase signal, to the other side (direction D2 side).
  • the acoustic signal emitted from the driver unit 11 to one side is called an acoustic signal AC1 (first acoustic signal)
  • the acoustic signal emitted from the driver unit 11 to the other side is called an acoustic signal AC1 (first acoustic signal).
  • This will be referred to as acoustic signal AC2 (second acoustic signal).
  • the acoustic signal AC1 is a signal for the user to listen to sound
  • the acoustic signal AC2 is a signal for suppressing sound leakage to the surroundings.
  • the driver unit 11 includes a diaphragm 113 that emits an acoustic signal AC1 in the D1 direction from one surface 113a by vibration, and emits an acoustic signal AC2 in the D2 direction from the other surface 113b by this vibration (Fig. 2B).
  • the diaphragm 113 vibrates based on the input output signal, so that the acoustic signal AC1 is emitted from one side surface 111 to the D1 direction side, and an opposite phase signal of the acoustic signal AC1 or The acoustic signal AC2, which is an approximation signal of the opposite phase signal, is emitted from the other side 112 in the direction D2.
  • the acoustic signal AC2 is emitted secondary to the emission of the acoustic signal AC1.
  • the D2 direction (the other side) is, for example, the opposite direction to the D1 direction (one side), but the D2 direction does not have to be strictly the opposite direction to the D1 direction, and if the D2 direction is different from the D1 direction, good.
  • the relationship between one side (D1 direction) and the other side (D2 direction) depends on the type and shape of the driver unit 11.
  • the acoustic signal AC2 may be strictly an antiphase signal of the acoustic signal AC1, or the acoustic signal AC2 may be an approximation signal of the antiphase signal of the acoustic signal AC1.
  • the approximate signal of the anti-phase signal of the acoustic signal AC1 may be a signal obtained by (1) shifting the phase of the anti-phase signal of the acoustic signal AC1, or (2) an anti-phase signal of the acoustic signal AC1.
  • It may be a signal obtained by changing the amplitude (amplification or attenuation) of (3) the acoustic signal AC1, or it may be a signal obtained by shifting the phase of the opposite phase signal of the acoustic signal AC1 and further changing the amplitude. good.
  • the phase difference between the anti-phase signal of the acoustic signal AC1 and its approximate signal is ⁇ 1 (rad) or less. Examples of ⁇ 1 are ⁇ /36, ⁇ /12, ⁇ /6, ⁇ /3, etc. Further, it is desirable that the ratio of the amplitude of the approximate signal to the amplitude of the anti-phase signal of the acoustic signal AC1 is ⁇ 2 or less.
  • Examples of ⁇ 2 are 0.1, 0.5, 1.0, 2.0, etc.
  • the amplitude of the sum signal obtained by adding the acoustic signal AC1 and the acoustic signal AC2 emitted from the driver unit 11 may be smaller than the amplitude of the acoustic signal AC1.
  • Ae ⁇ j ⁇ t be the sine wave of each frequency included in the acoustic signal AC1 emitted from the driver unit 11
  • ⁇ 2 Ae ⁇ j be the sine wave of each frequency included in the acoustic signal AC2 emitted from the driver unit 11. (- ⁇ t+ ⁇ 1 ).
  • t time
  • ⁇ angular frequency
  • a (A>0) amplitude
  • j imaginary unit
  • e Napier's number
  • ⁇ 1 represents the phase difference (rad) between the anti-phase signal of the acoustic signal AC1 and the acoustic signal AC2
  • ⁇ 2 ( ⁇ 2 >0) is the amplitude ratio between the anti-phase signal of the acoustic signal AC1 and the acoustic signal AC2.
  • the acoustic signal AC2 emitted from the driver unit 11 can be approximated to the opposite phase signal of the acoustic signal AC1 with an accuracy that satisfies 0 ⁇ 2 ⁇ 2cos ⁇ 1 .
  • the phase difference ⁇ 1 (rad ) should be less than ⁇ /3.
  • the amplitude of the anti-phase signal of the acoustic signal AC1 and the acoustic signal AC2 is This means that the ratio ⁇ 2 should be less than 2.
  • the driver unit 11 include a dynamic type, a balanced armature type, a hybrid type of a dynamic type and a balanced armature type, and a condenser type. Furthermore, there are no limitations on the shapes of the driver unit 11 and the diaphragm 113.
  • the outer shape of the driver unit 11 is a substantially cylindrical shape with both end surfaces, and the diaphragm 113 is a substantially disc shape, but this does not limit the present invention. isn't it.
  • the outer shape of the driver unit 11 may be a rectangular parallelepiped shape, or the diaphragm 113 may be a dome shape, a horn shape, or the like.
  • examples of the acoustic signal are sounds such as music, voice, sound effects, and environmental sounds.
  • the housing 12 is a hollow member having a wall portion on the outside, and houses the driver unit 11 inside.
  • the driver unit 11 is fixed to an end inside the housing 12 on the D1 direction side.
  • this does not limit the invention.
  • the shape of the housing 12 may be rotationally symmetrical (line symmetrical) or substantially rotationally symmetrical about the axis A1 extending along the D1 direction.
  • the axis A1 is an axis that passes through the central region of the housing 12 and extends in the D1 direction.
  • the casing 12 includes a wall 121 disposed on one side (D1 direction side) of the driver unit 11, a wall 122 disposed on the other side (D2 direction side) of the driver unit 11, and a wall 121 disposed on the other side (D2 direction side) of the driver unit 11. and a wall portion 123 (side surface) that surrounds the space sandwiched between the wall portion 122 and the wall portion 122 around the axis A1 passing through the wall portion 121 and the wall portion 122 (FIGS. 2B and 3B).
  • the housing 12 has a substantially cylindrical shape with both end surfaces.
  • the casing 12 may have a substantially dome shape with a wall at the end, a hollow substantially cubic shape, or any other three-dimensional shape.
  • the housing 12 may be made of a rigid body such as synthetic resin or metal, or may be made of an elastic body such as rubber.
  • the wall of the housing 12 includes a sound hole 121a (first sound hole) that emits (leads out) the acoustic signal AC1 (first acoustic signal) emitted from the driver unit 11 to the outside, and a sound hole 121a (first sound hole) that emits (leads out) the acoustic signal AC1 (first acoustic signal) emitted from the driver unit 11.
  • a sound hole 123a (second sound hole) that emits (leads out) the acoustic signal AC2 (second sound signal) to the outside is provided.
  • the sound hole 121a and the sound hole 123a are, for example, through holes penetrating the wall of the housing 12, but this does not limit the present invention.
  • the sound hole 121a and the sound hole 123a do not need to be through holes, as long as the acoustic signal AC1 and the acoustic signal AC2 can be respectively emitted to the outside.
  • the sound hole 121a (first sound hole) of the present embodiment is a region AR1 (a first region ) (Fig. 2B, Fig. 3B).
  • the sound hole 121a of this embodiment is arranged at an eccentric position shifted from the axis A1 (the central axis of the structure) in the B1 direction (first direction), and opens in the D1 direction.
  • the B1 direction is a specific radial direction centered on the axis A1.
  • an example is shown in which the shape of the edge of the open end of the sound hole 121a is elliptical (the open end is elliptical).
  • this does not limit the invention.
  • the shape of the edge of the sound hole 121a may be a circle, a square, a triangle, or other shapes.
  • the end portions of the sound holes 121a may have a mesh shape.
  • the end portion of the sound hole 121a may be constituted by a plurality of holes.
  • an example will be shown in which one sound hole 121a is provided in the area AR1 (first area) of the wall portion 121 of the housing 12.
  • this does not limit the invention.
  • two or more sound holes 121a may be provided in the area AR1 (first area) of the wall portion 121 of the housing 12.
  • the sound hole 123a (second sound hole) of the present embodiment is arranged between the area AR1 of the wall 121 of the housing 12 and the D2 direction side of the driver unit 11 (the other side from which the acoustic signal AC2 is emitted). It is provided in a region AR3 of the wall portion 123 that is in contact with a region AR between the region AR2 of the wall portion 122 and the region AR2. That is, if the center of the housing 12 is used as a reference and the direction between the D1 direction and the direction opposite to the D1 direction is the D12 direction (FIG. 3B), the sound hole 123a (second sound hole) is located at the D12 direction of the housing 12. It is installed on the direction side.
  • the casing 12 includes a wall 121 disposed on one side (D1 direction side) of the driver unit 11, a wall 122 disposed on the other side (D2 direction side) of the driver unit 11, and a wall 121 disposed on the other side (D2 direction side) of the driver unit 11. and a wall portion 123 (side surface) surrounding the space sandwiched between the wall portion 121 and the wall portion 122 around the axis A1 along the emission direction (D1 direction) of the acoustic signal AC1 passing through the wall portion 121 and the wall portion 122.
  • the sound hole 123a (second sound hole) is provided in the wall portion 123 (side surface).
  • the sound holes 123a (second sound holes) of this embodiment are arranged biased towards the B2 direction (second direction).
  • the B2 direction (second direction) is a direction including a component in the opposite direction to the B1 direction (first direction).
  • the sound hole 123a (second sound hole) is not provided on the B1 direction (first direction) side of the axis A1.
  • the sound holes 123a (second sound holes) facing the space SP1 (first space) are The total area of the opening ends is smaller than the total area of the opening ends of the sound holes 123a (second sound holes) facing the space SP2 (second space).
  • the sound pressure level of the acoustic signal AC2 (second acoustic signal) emitted from the sound hole 123a (second sound hole) into the space SP1 (first space) is lower than the sound pressure level from the sound hole 123a (second sound hole) to the space SP1 (first space).
  • the sound pressure level is lower than the sound pressure level of the acoustic signal AC2 (second acoustic signal) emitted to SP2 (second space).
  • the space SP1 is a space located on the B1 direction (first direction) side with respect to the sound hole 121a (first sound hole)
  • the space SP2 second space is a space located on the B1 direction (first direction) side with respect to the sound hole 121a (first sound hole).
  • This is a space located on the B2 direction (second direction) side with respect to the (first sound hole). That is, for example, the farther from the position of the sound hole 121a on the housing 12, the more sound holes 123a are arranged, and the closer to the position of the sound hole 121a on the housing 12, the fewer the sound holes 123a are arranged. It is preferable to design.
  • the support portion 13 is a convex portion provided on the outer surface of the wall portion 121 on the D1 side of the housing 12.
  • the support part 13 is provided with an open end 131b of the sound hole 121a, and the acoustic signal AC1 emitted from the sound hole 121a is emitted to the outside from the open end 131b.
  • the open end 131b is a through hole, and emits the acoustic signal AC1 emitted from the sound hole 121a to the outside.
  • the outer surface region 130 is a region on the outer surface side surrounding the open end 131b of the sound hole 121a (first sound hole), and is, for example, an annular region located on the outer surface side of the support portion 13 in the D1 direction.
  • the outer surface region 130 includes a region 131 (first region) and a region 132 (second region) that protrudes from the region 131 (first region), and contains sound emitted from the sound hole 121a (first sound hole). It is configured to have a shape that guides the signal AC1 (first acoustic signal) to the region 131 (first region) side.
  • the region 131 (first region) in this example is arranged on the B1 direction (first direction) side of the region 132 (second region), and the outer surface region 130 receives the acoustic signal AC1 emitted from the sound hole 121a. Guide it in the B1 direction.
  • the open end 131b of the sound hole 121a (first sound hole) faces the space SP surrounded by the region 132 (second region), and the region 131 (first region) side of the space SP is the space SP surrounded by the region 132 (second region). It is open to the outer periphery of SP (outward in the B1 direction).
  • the region 132 is a convex region whose surface 132a protrudes outward (in the D1 direction) from the surface 131a of the region 131, and the region 131 (the first region ) side (B1 direction side).
  • the region 131 is more depressed than the region 132, and the region 132 is curved so as to partially surround the opening end 131b of the region 131.
  • the region 131 in this example is arranged on the B1 direction (first direction) side of the opening end 131b of the sound hole 121a, and the region 132 is arranged in the radial direction of 360 degrees around the opening end 131b.
  • the region 132 has a chevron shape having a maximum portion at one or more locations.
  • the surface 132a of the region 132 in this example is connected to the surface 131a of the region 131 via the slope portion 132c of the region 132. That is, the inclined portion 132c in this example has a tapered shape that widens from the surface 131a to the surface 132a.
  • the acoustic signal AC1 emitted from the sound hole 121a can be efficiently guided to the external auditory canal side of the user who is placed on the area 131 side (B1 direction side) when the acoustic signal output device 10 is worn.
  • the opening end 131b side of the region 132 does not have to have a tapered shape.
  • the open end of the sound hole 123a (second sound hole) faces a space outside the space SP surrounded by the region 132 (second region). More specifically, the opening end of the sound hole 123a (second sound hole) of this embodiment faces the space outside the space surrounded by the outer surface area 130.
  • the sound holes 123a (second sound holes) are arranged biased towards the B2 direction (second direction). Due to these, the acoustic signal AC2 emitted from the sound hole 123a is less likely to reach the user's external auditory canal side than the acoustic signal AC1 emitted from the sound hole 121a.
  • the illustrated shape of the support portion 13 is an example and does not limit the present invention.
  • the surface 132a of the region 132 projects in the D1 direction more than the surface 131a of the region 131
  • the surface 131a of the region 131 and the surface 132a of the region 132 may have a convex shape or a concave shape. It may have an uneven shape, it may have an uneven shape, or it may have a flat shape. However, when the surface 132a of the region 132 has a curved convex shape, the fit when worn is better.
  • the support portion 13 may be made of a rigid body such as synthetic resin, or may be made of an elastic body such as rubber or urethane. However, if the region 132 is made of an elastic body, the fit when worn is better.
  • the mounting state of the acoustic signal output device 10 will be illustrated with reference to FIG.
  • the acoustic signal output device 10 of this embodiment is attached to the auricle 1010 (body) so that the support section 13 side faces the auricle 1010 side of the user 1000.
  • the region 132 (second region) of the support section 13 is attached to either of the auricles 1010 (body).
  • the opening end 131b of the sound hole 121a (first sound hole) and the region 131 (first region) of the support part 13 do not contact at least a part of the auricle 1010 (body).
  • Region 131 (first region) is arranged on the external auditory canal 1011 side.
  • the region 132 is placed above the auricle 1010, and the surface 132a of the region 132 contacts the upper portion of the auricle 1010 (for example, the triangular fossa or the navicular fossa). Supported. This can prevent the sound hole 121a from coming into contact with any part of the auricle 1010 of the user 1000 and being blocked.
  • the region 131 comes into contact with the auricle 1010 and acts as a support, it provides a high sense of stability when worn.
  • the region 131 when the region 131 has a convex shape, the region 131 fits into the concave shape of the auricle 1010 and acts as a support, increasing the sense of stability when worn. This effect is higher when the region 131 is an elastic body than when it is a rigid body.
  • the region 131 When the acoustic signal output device 10 is worn, for example, the region 131 is placed below the region 132 (on the side of the external auditory canal 1011).
  • the outer surface area 130 of the support part 13 transmits the acoustic signal AC1 (first acoustic signal) emitted from the sound hole 121a (first sound hole) to the area 131 (first area) side (B1 direction side). It is structured in a shape that guides the user.
  • the acoustic signal AC1 emitted from the sound hole 121a is guided to the external auditory canal 1011 side (lower side of the auricle 1010) and emitted. Since the region 132 supported by the auricle 1010 protrudes more than the region 131, the open end 131b and at least a portion of the region 131 do not contact the auricle 1010. Preferably, open end 131b and region 131 do not contact auricle 1010. Furthermore, the support portion 13 does not block the external auditory canal 1011. Thereby, the acoustic signal AC1 emitted from the sound hole 121a efficiently reaches the external auditory canal 1011.
  • the inclined portion 132c of the support portion 13 has a tapered shape that widens from the surface 131a to the surface 132a, the acoustic signal AC1 emitted from the sound hole 121a reaches the ear canal 1011 more efficiently.
  • the B2 direction side of the open end 131b of the sound hole 121a is surrounded by the area 132, leakage of the acoustic signal AC1 emitted from the sound hole 121a toward the B2 direction side (sound leakage) can be suppressed.
  • the sound pressure level of the acoustic signal AC1 (first acoustic signal) emitted from the external auditory canal 1011 to the external auditory canal 1011 side is higher than the sound pressure level of the acoustic signal AC1 (first acoustic signal) emitted from the external auditory canal 1011 to the external auditory canal 1011 side.
  • the open end of the sound hole 123a (second sound hole) of this embodiment faces the space outside the space SP surrounded by the region 132 (second region). Further, the sound hole 123a (second sound hole) is arranged biased toward the B2 direction (second direction) side. As a result, the acoustic signal AC2 emitted from the sound hole 123a is less likely to reach the ear canal 1011 side of the user 1000 than the acoustic signal AC1 emitted from the sound hole 121a. Furthermore, this acoustic signal AC2 has the function of canceling out the acoustic signal AC1 leaked to the outside and suppressing sound leakage. This will be explained using FIGS. 6A and 6B. In the example of FIG.
  • one acoustic signal output device 10 is attached to each of the pinna 1010 of the right ear and the pinna 1020 of the left ear of the user 1000.
  • An arbitrary attachment mechanism is used to attach the acoustic signal output device 10 to the ear.
  • the D1 direction side of each acoustic signal output device 10 is directed toward the user 1000 side.
  • the output signal output from the playback device 100 is input to the driver unit 11 of each audio signal output device 10, and the driver unit 11 emits the audio signal AC1 in the direction D1 and the audio signal AC2 in the other direction. .
  • An acoustic signal AC1 is emitted from the sound hole 121a, and the emitted acoustic signal AC1 enters the external auditory canal 1011 of the right ear and left ear, and is heard by the user 1000.
  • an acoustic signal AC2 which is an antiphase signal of the acoustic signal AC1 or an approximation signal of the antiphase signal, is emitted.
  • a part of this acoustic signal AC2 cancels out a part (sound leakage component) of the acoustic signal AC1 emitted from the sound hole 121a.
  • the acoustic signal AC1 (first acoustic signal) is emitted from the sound hole 121a (first sound hole)
  • the acoustic signal AC2 (second acoustic signal) is emitted from the sound hole 123a (second sound hole).
  • the attenuation rate ⁇ 11 of the acoustic signal AC1 (first acoustic signal) at position P2 (second point) with reference to position P1 (first point) can be made equal to or less than a predetermined value ⁇ th ;
  • the attenuation amount ⁇ 12 of the acoustic signal AC1 (first acoustic signal) at the position P2 (second point) with respect to the position P1 (first point) may be set to be greater than or equal to a predetermined value ⁇ th .
  • the position P1 (first point) is a predetermined point where the acoustic signal AC1 (first acoustic signal) emitted from the sound hole 121a (first sound hole) reaches.
  • position P2 (second point) is a predetermined point that is farther from the acoustic signal output device 10 than position P1 (first point).
  • the positions P1 and P2 may be any points, but for example, the positions P1 and P2 are positions in a direction other than the B1 direction of the acoustic signal output device 10, such as the B2 direction or the D2 position of the acoustic signal output device 10.
  • the predetermined value ⁇ th is a value ( low value).
  • the predetermined value ⁇ th is larger than the attenuation amount ⁇ 22 of an arbitrary or specific acoustic signal (sound) due to air propagation at position P2 (second point) based on position P1 (first point).
  • the acoustic signal output device 10 of the present embodiment is designed such that the attenuation rate ⁇ 11 is equal to or less than a predetermined value ⁇ th smaller than the attenuation rate ⁇ 21 , or the attenuation amount ⁇ 12 is It is designed to be equal to or greater than a predetermined value ⁇ th which is larger than the attenuation amount ⁇ 22 .
  • the acoustic signal AC1 is propagated through the air from the position P1 to the position P2, and is attenuated due to this air propagation and the acoustic signal AC2.
  • the attenuation factor ⁇ 11 is the magnitude AMP 2 (AC1) of the acoustic signal AC1 at the position P2, which is attenuated due to air propagation and the acoustic signal AC2, with respect to the magnitude AMP 1 (AC1) of the acoustic signal AC1 at the position P1.
  • ) is the ratio (AMP 2 (AC1)/AMP 1 (AC1)).
  • the attenuation amount ⁇ 12 is the difference (
  • Attenuation rate ⁇ 21 is the acoustic signal at position P2 that is attenuated due to air propagation (attenuated not due to acoustic signal AC2) with respect to the magnitude AMP 1 (AC ar ) of acoustic signal AC ar at position P1.
  • This is the ratio (AMP 2 (AC ar ) /AMP 1 (AC ar )) of the magnitude of AC ar AMP 2 (AC ar ).
  • the attenuation amount ⁇ 22 is the difference (
  • the magnitude of the acoustic signal include the sound pressure of the acoustic signal or the energy of the acoustic signal.
  • the "sound leakage component" refers to, for example, an area other than the user 1000 wearing the acoustic signal output device 10 in the acoustic signal AC1 emitted from the sound hole 121a (for example, the area where the user 1000 wearing the acoustic signal output device 10 This refers to ingredients that are likely to reach humans (other than 1,000 people).
  • sound leakage component means a component of the acoustic signal AC1 that propagates in a direction other than the D1 direction.
  • the direct wave of the acoustic signal AC1 is mainly emitted from the sound hole 121a
  • the direct wave of the second acoustic signal is mainly emitted from the second sound hole.
  • a part of the direct wave (sound leakage component) of the acoustic signal AC1 emitted from the sound hole 121a is canceled out by interfering with at least a part of the direct wave of the acoustic signal AC2 emitted from the sound hole 123a.
  • this is not a limitation of the present invention, and this cancellation can also occur with other than direct waves.
  • the sound leakage component which is at least one of the direct wave and reflected wave of the acoustic signal AC1 emitted from the sound hole 121a, is canceled by at least one of the direct wave and reflected wave of the acoustic signal AC2 emitted from the sound hole 123a.
  • sound leakage can be suppressed.
  • the sound hole 123a (second sound hole) is arranged biased toward the B2 direction (second direction), the acoustic signal AC2 emitted from the sound hole 123a is difficult to reach the ear canal 1011 side. Therefore, on the ear canal 1011 side, the acoustic signal AC1 is difficult to be canceled out by the acoustic signal AC2. That is, since the sound hole 123a is far from the ear canal 1011, the acoustic signal AC2 emitted from the sound hole 123a is difficult to cancel out the acoustic signal AC1 emitted from the sound hole 121a to the ear canal 1011 side.
  • the acoustic signal AC2 can suppress the sound leakage of the acoustic signal AC1 leaked to other than the external auditory canal 1011 side without significantly suppressing the acoustic signal AC1 emitted to the external auditory canal 1011 side.
  • the distance from the ear canal 1011 to the sound hole 121a is 2 cm or more and 3 cm or less, and the distance from the sound hole 121a to the sound hole 123a is 2 cm or more. is desirable. However, this does not limit the invention.
  • ⁇ Abandoned state> As illustrated in FIG. 7, a state in which the acoustic signal output device 10 is left on a flat surface 1100 such as a desk will be described.
  • the support portion 13 side is arranged on a plane 1100.
  • the region 132 protrudes more than the region 131, the opening end 131b of the sound hole 121a and at least a portion of the region 131 do not contact the plane 1100. Therefore, the acoustic signal AC1 emitted from the open end 131b of the sound hole 121a and the acoustic signal AC2 emitted from the sound hole 123a cancel each other out as described above, thereby suppressing sound leakage.
  • the position and size of the region 132 and the shape of the surface 132a of the region 132 are adjusted so that the opening end 131b of the sound hole 121a and at least a part of the region 131 do not come into contact with the plane 1100.
  • the angle etc. are set.
  • Such an effect can also be obtained when the housing 12 side is placed on the plane 1100. That is, no matter what direction the acoustic signal output device 10 of this embodiment is placed on the plane 1100, the acoustic signal AC1 emitted from the open end 131b of the sound hole 121a and the acoustic signal emitted from the sound hole 123a AC2 cancel each other out as described above, and sound leakage can be suppressed.
  • the shape, size, and arrangement of the sound hole 121a and the sound hole 123a are not limited to those exemplified in the first embodiment.
  • one sound hole 121a is provided in the area AR1 of the housing 12, and the open end 131b of the one sound hole 121a is provided in the support portion 13.
  • a plurality of sound holes 121a may be provided in the region AR1 of the casing 12, and an open end 131b of the plurality of sound holes 121a may be provided in the support portion 13.
  • the plurality of sound holes 121a and the open ends 131b may be eccentrically shifted from the axis A1 in the B1 direction.
  • the sound holes 123a of the same shape and size are arranged on the same circumference of the wall portion 123 of the housing 12.
  • the sound hole 123a It can be of any shape and size. That is, it is sufficient that the sound pressure level of the acoustic signal AC2 emitted from the sound hole 123a into the space SP1 is lower than the sound pressure level of the acoustic signal AC2 emitted from the sound hole 123a into the space SP2.
  • the space SP1 is a space located on the B1 direction side with respect to the sound hole 121a
  • the space SP2 is a space located on the B2 direction side with respect to the sound hole 121a.
  • a plurality of sound holes 123a may be provided with different sizes, or as illustrated in FIG. 8C, a plurality of sound holes 123a (second sound holes) may be provided with different shapes. A second sound hole) may be provided, or the plurality of sound holes 123a may not be arranged on the same circumference.
  • the sound hole 123a may also be provided on the B1 direction side of the axis A1.
  • the opening area of the sound holes 123a arranged on the B1 direction side of the axis A1 is smaller than the opening area of the sound holes 123a arranged biased towards the B2 direction side, or the axis A1
  • the opening area per unit area (that is, the density of the opening area) of the sound holes 123a arranged in the B1 direction is larger than the opening area per unit area of the sound holes 123a arranged biased toward the B2 direction. The smaller the better.
  • the total area of the open ends of the sound holes 123a facing the space SP1 becomes smaller than the total area of the open ends of the sound holes 123a facing the space SP2, and the sound is emitted from the sound holes 123a into the space SP1.
  • the sound pressure level of the acoustic signal AC2 emitted from the sound hole 123a is lower than the sound pressure level of the acoustic signal AC2 emitted from the sound hole 123a into the space SP2.
  • the opening area of the opening end of the sound hole 123a whose distance from the opening end 131b of the sound hole 121a is ⁇ 1 is the same as that of the opening end of the sound hole 123a whose distance from the opening end 131b of the sound hole 121a is ⁇ 2 . It may be designed to be smaller than the opening area. However, ⁇ 1 ⁇ 2 .
  • the sound hole 123a may be configured such that the closer the distance from the opening end 131b of the sound hole 121a is, the smaller the opening area of the opening end becomes.
  • the sound pressure level of the acoustic signal AC2 emitted therefrom is on the B2 direction side. It is sufficient that the sound pressure level is lower than the sound pressure level of the acoustic signal AC2 emitted from the unevenly arranged sound holes 123a.
  • the acoustic signal AC2 emitted from the driver unit 11 has directivity, so that the sound pressure level of the acoustic signal AC2 emitted from the sound hole 123a disposed on the B1 direction side of the axis A1 is
  • the sound pressure level may be lower than the sound pressure level of the acoustic signal AC2 emitted from the sound hole 123a, which is biased toward the direction.
  • a plurality of driver units 11 having different output powers are housed inside the housing 12, so that the sound pressure level of the acoustic signal AC2 emitted from the sound hole 123a disposed on the B1 direction side of the axis A1 is adjusted.
  • the sound pressure level may be lower than the sound pressure level of the acoustic signal AC2 emitted from the sound hole 123a, which is biased toward the B2 direction.
  • a material that attenuates the acoustic signal may be placed in the opening of the sound hole 123a provided on the B1 direction side of the axis A1, or a material for attenuating the acoustic signal may be placed in the opening of the sound hole 123a provided on the B1 direction side of the axis A1.
  • the portion may have a shape such as a mesh structure that attenuates the acoustic signal.
  • a plurality of sound holes 123a are provided in the housing 12, and among the open ends of the sound holes 123a (second sound holes), the opening facing the space SP1 (first space)
  • the sound pressure level of the acoustic signal AC2 (second acoustic signal) emitted from the end is emitted from the open end facing the space SP2 (second space) among the open ends of the sound hole 123a (second sound hole). It is sufficient that the sound pressure level is lower than the sound pressure level of the acoustic signal AC2 (second acoustic signal).
  • the sound pressure level of the acoustic signal AC2 emitted from the open end of the sound hole 123a whose distance from the open end 131b of the sound hole 121a is ⁇ 1 is the same as that of the sound whose distance from the open end 131b of the sound hole 121a is ⁇ 2 .
  • the sound pressure level may be designed to be lower than the sound pressure level of the acoustic signal AC2 emitted from the open end of the hole 123a.
  • ⁇ 1 ⁇ 2 .
  • the sound hole 123a may be designed such that the closer the distance from the opening end 131b of the sound hole 121a is, the lower the sound pressure level of the emitted acoustic signal AC2 becomes.
  • the case 12 is provided with a plurality of sound holes 123a, but the case 12 may be provided with one sound hole 123a.
  • the open end of the sound hole 123a be as far away from the sound hole 121a as possible.
  • the sound hole 123a is provided such that the distance between the open end of the sound hole 123a and the sound hole 121a is maximum.
  • the acoustic signal output device 10 illustrated in the first embodiment emits the acoustic signal AC2 from the sound hole 123a to offset the acoustic signal AC1 released from the sound hole 121a and leaked to the outside, thereby suppressing sound leakage. ing.
  • This is based on the fact that ideally the acoustic signal AC2 is in opposite phase to the acoustic signal AC1.
  • the propagation path of the acoustic signal AC1 and the propagation path of the acoustic signal AC2 are different, a phase difference occurs between the acoustic signal AC1 and the acoustic signal AC2. There are cases where the phase is not opposite to that of the signal AC1.
  • the acoustic signal AC2 does not cancel out the acoustic signal AC1, and on the contrary, the acoustic signal AC2 is also perceived as a sound leakage component.
  • the sound leakage of the acoustic signal AC1 can be suppressed by the acoustic signal AC2 when the frequency of the acoustic signals AC1 and AC2 is up to about 3 kHz, and in the frequency band higher than that, the acoustic signal AC2 also becomes a sound leakage component. Put it away.
  • the human ear is sensitive to the 3kHz-6kHz band, and in this band, even if the sound is quiet compared to other bands, it is perceived as loud.
  • Such human auditory characteristics are expressed as an equal loudness curve.
  • This equal loudness curve connects the sound pressure levels at which sounds of various frequencies perceptually sound the same loudness.
  • FIG. 13 shows equal loudness curves. The horizontal axis in FIG. 13 represents frequency [Hz], and the vertical axis represents sound pressure level [dB]. As shown in FIG. 13, the equal loudness curve reaches a minimum near 4kHz, indicating that the human hearing sensitivity is high at this frequency. Therefore, it is desirable to lower the sound pressure level of the acoustic signal AC2 in the 3kHz-6kHz band where human hearing sensitivity is high.
  • the acoustic signal AC2 emitted from the driver unit 11 is emitted to the area AR, which is the internal space of the housing 12 (enclosure), and is further emitted to the outside from the sound hole 123a.
  • the sound pressure level of the acoustic signal AC2 reaches a maximum at the resonance frequency of the AR. Therefore, in order to suppress sound leakage on the high frequency side, it is desirable to set this resonant frequency to a range above the range where human auditory sensitivity is high (for example, 6 kHz or above).
  • FIG. 14A illustrates the relationship between the volume of the region AR and the acoustic signal AC2 emitted to the outside from the sound hole 123a. As illustrated in FIG.
  • the acoustic signal output device 20 of this embodiment includes a driver unit 11, a casing 12 (structural part) housing the driver unit 11 inside, and a support part 13 ( structural part).
  • the housing 12 (structural part) has one or more sound holes 121a (first sound holes) that emit the sound signal AC1 (first sound signal) to the outside, and the sound hole 121a (first sound hole) that emits the sound signal AC1 (first sound signal) to the outside. a hollow part from which the second acoustic signal) is emitted; and one or more sound holes 123a (second sound hole).
  • the resonant frequency of this hollow part is designed to be a predetermined frequency or higher (e.g., a band with high human auditory sensitivity, e.g., 6 kHz or higher), and a frequency band component including the predetermined frequency (e.g., Designed so that acoustic signal AC2 (second acoustic signal) with suppressed band components to which human auditory sensitivity is high (for example, band components of 3 kHz to 6 kHz) is emitted to the outside from sound hole 123a (second sound hole). be done.
  • acoustic signal AC2 second acoustic signal
  • band components for example, band components of 3 kHz to 6 kHz
  • An example of such a design is shown below.
  • the housing 12 (structural part) of the acoustic signal output device 20 may have an internal hollow part 241 disposed in the region AR (internal space) of the hollow part 220.
  • the internal space ISP of the internal hollow part 241 is spatially partitioned from the area AR (internal space) of the hollow part 220 located outside the internal hollow part 241 . That is, the internal hollow part 241 is a hollow member having a wall part 242 on the outside, and the internal space ISP is spatially partitioned off from the area AR by the wall part 242.
  • the internal hollow portion 241 may have any shape as long as it has such an internal space ISP. There is also no limitation on the material forming the wall portion 242.
  • the wall portion 242 may be made of a rigid body such as synthetic resin or metal, or may be made of an elastic body such as rubber. Moreover, the internal space ISP of the internal hollow part 241 only needs to be spatially partitioned from the area AR, and may or may not be completely sealed. The internal space ISP may be filled with air or other gas, or may be further provided with a substance such as an elastic body. However, it is desirable that the material placed in the internal space ISP be softer than the wall portion 242.
  • the bottom surface portion 242a of the wall portion 242 of the internal hollow portion 241 in this example is fixed to the area AR2 inside the hollow portion 220.
  • any region of the wall portion 242 of the internal hollow portion 241 may be fixed to any region inside the hollow portion 220.
  • the volume of the area AR can be reduced and the resonance frequency of the hollow part 220 can be reduced. Can be made high. Therefore, by appropriately designing the volume of the internal hollow part 241, the resonant frequency of the hollow part 220 can be made to be higher than the band in which human auditory sensitivity is high (for example, 6 kHz or higher).
  • the internal hollow part 241 has a high degree of freedom in design, and the shape and size of the internal hollow part 241 can be set so that the volume of the region AR is sufficiently small.
  • the air in the internal space ISP of the internal hollow part 241 acts as a damper to reduce the vibration of the hollow part 220, so that the acoustic signal AC2 (second acoustic It is possible to suppress the high frequency band components of the signal).
  • the cushioning material 25 is arranged between the bottom part 242a (outside) of the internal hollow part 241 and the area AR2 (inside) of the hollow part 220, and the buffer material 25 is arranged between the bottom part 242a (outside) of the internal hollow part 241 ) may be fixed to the area AR2 (inside) of the hollow portion 220 via the cushioning material 25.
  • the buffer material 25 is arranged on the bottom surface 242a of the internal hollow part 241, but the buffer material 25 is arranged between the other wall part 242 of the internal hollow part 241 and the inside of the hollow part 220.
  • the other wall portion 242 of the internal hollow portion 241 may be fixed inside the hollow portion 220 via the cushioning material 25.
  • the cushioning material 25 is softer than the wall portion 122 of the housing 12 and the wall portion 242 of the internal hollow portion 241, and thereby can further reduce the vibration of the hollow portion 220. Thereby, the high frequency band components of the acoustic signal AC2 emitted to the outside from the sound hole 123a can be suppressed.
  • the material for the cushioning material 25 are paper, urethane, rubber, etc.
  • double-sided tape made of paper may be used as the cushioning material 25.
  • a solid member whose inside is filled may be used instead of the internal hollow portion 241.
  • the electronic member 26 for driving the driver unit 11 may be accommodated in the internal space ISP of the internal hollow part 241.
  • the internal space of the internal space ISP that functions as a damper can be used as a space for arranging the electronic component 26, and the casing 12 can be made smaller.
  • the electronic member 26 are a wiring cable, an electronic component, an electronic board, and the like. Considering the function as a damper, it is desirable that the electronic member 26 is made of a softer material than the wall portion 242, such as a wiring cable.
  • the cushioning material 25 is arranged between the bottom part 242a (outside) of the internal hollow part 241 and the area AR2 (inside) of the hollow part 220, and the bottom part of the internal hollow part 241 is
  • the portion 242a (outside) may be fixed to the region AR2 (inside) of the hollow portion 220 via the cushioning material 25.
  • the driver unit 11 further includes a frequency band component (for example, a frequency range in which human hearing sensitivity is high, such as 6kHz) that includes the predetermined frequency described above (for example, a band in which human hearing sensitivity is high; for example, 6 kHz).
  • the acoustic signal AC2 second acoustic signal
  • high band components for example, band components of 3 kHz to 6 kHz
  • the region AR internal space
  • an LPF (low pass filter) section 200 may be provided between the reproduction device 100 that outputs an output signal for driving the driver unit 11 and the driver unit 11.
  • This low-pass filter suppresses (attenuates or flattens) frequency band components including the above-mentioned predetermined frequency (for example, a band in which human auditory sensitivity is high). For example, assume that the cutoff frequency of this low-pass filter is 3kHz.
  • the output signal output from the reproducing device 100 is input to the LPF section 200, and the LPF section 200 outputs a low-pass output signal in which the high frequency side of this output signal is attenuated.
  • the low-pass output signal is input to the driver unit 11, and the driver unit 11 drives based on the low-pass output signal.
  • the driver unit 11 transmits frequency band components (for example, band components to which human hearing sensitivity is high; for example, 3kHz to 6kHz) including the above-mentioned predetermined frequency (for example, a band to which human hearing sensitivity is high; for example, 6kHz).
  • the acoustic signal AC2 (second acoustic signal) with suppressed band components) is emitted to the region AR (internal space) of the hollow portion 220.
  • the acoustic signal AC2 (second acoustic signal) emitted to the region AR (internal space) of the hollow portion 220 is further emitted to the outside from the sound hole 123a.
  • the LPF section 200 may be realized by electronic components such as a coil and a capacitor, or may be realized by digital processing.
  • a power source for driving the LPF section 200 is not required.
  • the acoustic signal output device 20 may be a wired type that does not require a power source.
  • the LPF section 200 may be provided outside the casing 12 or may be provided in the casing 12 itself.
  • the driver unit 11 includes a frequency band component (for example, a band component to which human hearing sensitivity is high; for example, a band to which human hearing sensitivity is high; for example, a band to which human hearing sensitivity is high; for example, 6 kHz)).
  • a frequency band component for example, a band component to which human hearing sensitivity is high; for example, a band to which human hearing sensitivity is high; for example, 6 kHz.
  • a switching unit 210 may be further provided to switch whether or not to emit the acoustic signal AC2 (second acoustic signal) to the area AR (internal space) of the hollow portion 220.
  • the switching unit 210 switches whether or not to use the LPF unit 200 of Design Example 4.
  • the low-pass output signal via the LPF section 200 is input to the driver unit 11, and the driver unit 11 operates based on this low-pass output signal. drive.
  • the LPF section 200 is switched not to be used, the output signal output from the playback device 100 is directly input to the driver unit 11, and the driver unit 11 is driven based on this output signal.
  • the user can emit acoustic signals AC1 and AC2 that suppress the frequency band components mentioned above in environments where it is necessary to be concerned about sound leakage, and reduce the sound in the high frequency range.
  • the above-mentioned frequency band components for example, band components to which human hearing is sensitive; for example, 3kHz to 6kHz band components
  • the switching unit 210 may be provided outside the casing 12 or may be provided in the casing 12 itself.
  • the high frequency side component (including the above-mentioned predetermined frequency) of the acoustic signal AC2 (second acoustic signal) emitted from the driver unit 11 is frequency band components) may be suppressed.
  • the diaphragm of the driver unit 11 is a dynamic type having a paper cone
  • the high frequency reproduction limit frequency fh of the paper cone is the upper limit of the range (e.g., 3kHz-6kHz band component) for which human auditory sensitivity is high (e.g.,
  • the stiffness sh of the cone paper neck can be designed so that the stiffness sh is 6kHz or around 6kHz.
  • M is the mass of the vibration system including the paper cone. That is, the softer the material of the diaphragm of the driver unit 11, the lower the high frequency reproduction limit frequency fh can be.
  • driver unit 11 and the LPF section 200 of Design Example 4 may be combined.
  • FIG. 14B illustrates sound pressure levels when using the LPF section 200 (with LPF) and when not using the LPF section 200 (without LPF). As illustrated in FIG. 14B, it can be seen that by using the LPF section 200, the sound pressure level in a band where human auditory sensitivity is high (for example, a band component of 3 kHz to 6 kHz) can be suppressed, and sound leakage can be reduced.
  • a band where human auditory sensitivity is high for example, a band component of 3 kHz to 6 kHz
  • one end 311 of a curved rod-shaped ear hook 310 is fixed to the outside of the housing 12.
  • the acoustic signal output device 10 (20) can be attached as shown in FIG.
  • one end 311 of the ear hook portion 310 is fixed not to the area 131 (first area) side but to the area 132 (second area) side.
  • the acoustic signal AC1 (first acoustic signal) emitted to the region 131 side is emitted to the ear canal 1011 without being blocked by the ear hook portion 310.
  • the acoustic signal output device 30 illustrated in FIGS. 16A to 16C is one in which the support portion 13 of the above-described acoustic signal output device 10 (20) is integrated into a temple 33 of a pair of glasses.
  • the region 131 (first region) of the support portion 13 is arranged on the ear hook portion 33a side (B1 direction side) of the temple 33 attached to the auricle 1020, and is more protruding than the region 131 (first region).
  • the area 132 (second area) is arranged on the lens 34 side (B2 direction side).
  • the region 132 (second region) protrudes inside the temple 33 in the direction (D1 direction), and as described above, the acoustic signal AC1 (first acoustic signal) emitted from the sound hole 121a (first sound hole). It is configured to have a shape that guides it toward the region 131 (first region) side (B1 direction side).
  • the region 132 (second region) of the support portion 13 is supported by contacting any part of the head (body), and the open end 131b of the sound hole 121a (first sound hole)
  • the region 131 (first region) of the support portion 13 is arranged on the ear canal 1011 side without contacting at least a part of the head (body).
  • the acoustic signal AC1 emitted from the sound hole 121a is guided to the external auditory canal 1021 side (lower side of the auricle 1020) and emitted.
  • the acoustic signal output device 3100 of wearing method 3 includes a structure section 2112 including a housing and a support section, and a structure section 2112 that is attached to an intermediate portion 1023 of an auricle 1020 while holding the structure section 2112. It has a mounting part 2122 configured as follows. Note that the intermediate portion 1023 is an intermediate portion between the upper portion 1022 (on the helix side) and the lower portion 1024 (on the earlobe side) of the auricle 1020.
  • the structural part 2112 is the casing 12 and the support part 13 exemplified in the first embodiment, its modification, or the second embodiment.
  • the acoustic signal output device 4100 of wearing method 4 includes a structure section 2112 including a housing and a support section, and a structure section 2112 that holds the structure section 2112 and is a part of the auricle 1020. and a mounting portion 2224 configured to be mounted to the upper portion 1022.
  • the acoustic signal output device 4100' of wearing method 5 includes a structure section 2112 including a housing and a support section, and an auricle 1020 that holds the structure section 2112 and is a part of the auricle 1020. It has an attachment part 2224 configured to be attached to the upper part 1022 of the ear, and an attachment part 4421 configured to contact the concha cavity 1025 of the auricle 1020.
  • the acoustic signal output device 4200 illustrated in FIG. 19 includes a structural portion 2112, a columnar mounting portion 4210 configured to hold the structural portion 2112 and be placed at the base of the auricle 1020 when worn. It has an arc-shaped attachment part 4220 that is held at both ends of the part 4210 and is attached to a region from the back side of the upper part 1022 to the lower part 1024 of the auricle 1020.
  • the acoustic signal output device 5110 of wearing method 7 illustrated in FIGS. 20A to 20E includes a structural part 5111 that emits an acoustic signal, and a structural part 5111 that is held and hooked to the back side of the upper part 1022 of the auricle 1020 when worn. It has a mounting part 5112 of the type shown in FIG.
  • the structural part 5112 is the casing 12 and the support part 13 exemplified in the first embodiment, its modification, or the second embodiment.
  • the mounting part 5112 is a bent rod-shaped member, and the structural part 5111 is attached to one end of the mounting part 5112 so as to be rotatable in the R5 direction.
  • the auricle 1020 is sandwiched between the structural part 5111 and the mounting part 5112, thereby fixing the acoustic signal output device 5110 to the auricle 1020. Further, since the structural portion 5111 is rotatable in the R5 direction with respect to one end of the mounting portion 5112, the mounting position and the position of the sound hole can be adjusted in accordance with the size and shape of each auricle 1020.
  • the acoustic signal output device 5120 of wearing method 8 illustrated in FIGS. 21A to 21C includes a structural part 5121 that emits an acoustic signal, and a structural part 5121 that is held and hooked to the back side of the upper part 1022 of the auricle 1020 when worn. It has a mounting part 5122 of the type shown in FIG.
  • the structural part 5121 is the casing 12 and the support part 13 exemplified in the first embodiment, its modification, or the second embodiment. Unlike mounting method 7, the structure part 5121 is not rotatable to the mounting part 5122.
  • the auricle 1020 is sandwiched between the structural part 5121 and the mounting part 5122, thereby fixing the acoustic signal output device 5120 to the auricle 1020.
  • Acoustic signal output devices 5130 and 5140 of wearing method 9 illustrated in FIGS. 22A and 22B each have structural parts 5131 and 5141 that emit acoustic signals, and hold structural parts 5131 and 5141, and when worn, they are attached to the auricle 1020. It has mounting portions 5132 and 5142 of a type that can be hooked onto the back side of the upper portion 1022 of the device.
  • the structural parts 5131 and 5141 are the casing 12 and the support part 13 exemplified in the first embodiment, its modification, or the second embodiment.
  • the acoustic signal output device 5140 illustrated in FIG. 22B is provided with a mounting portion 5143 configured to contact the concha cavity 1025 of the auricle 1020 when worn. This allows for more stable mounting.
  • the acoustic signal output device 5150 illustrated in FIGS. 23A, 23B, and 23C includes a structural portion 5151 that emits an acoustic signal, and a structure that holds the structural portion 5151 and is hooked to the back side of the upper portion 1022 of the auricle 1020 when worn.
  • the structural part 5151 is the casing 12 and the support part 13 exemplified in the first embodiment, its modification, or the second embodiment.
  • the auricle 1020 is sandwiched between the structural portion 5151 and the mounting portions 5152 and 5153, thereby fixing the acoustic signal output device 5150 to the auricle 1020.
  • the acoustic signal output device 5160 illustrated in FIGS. 24A to 24E is configured to include a structural portion 5161 that emits an acoustic signal, and a structure that holds the structural portion 5161 and is placed at the base of the auricle 1020 when worn.
  • the structural part 5161 is the housing 12 and the support part 13 exemplified in the first embodiment, its modification, or the second embodiment.
  • the auricle 1020 is sandwiched between the structural section 5161, the mounting section 5164, and the mounting sections 5152, 5153, thereby fixing the acoustic signal output device 5160 to the auricle 1020.
  • the acoustic signal output devices 5170 and 5180 illustrated in FIGS. 25A to 25D and 26A to 26D respectively include structural parts 5171 and 5181 that emit acoustic signals, and the back side of the intermediate portion 1023 of the auricle 102 when worn.
  • column-shaped mounting parts 5172, 5182 configured to be arranged in a curved strip-shaped support part 5173, one end of which holds the structural parts 5171, 5181, and the other end of which holds the mounting parts 5172, 5182. , 5183.
  • the structural parts 5171 and 5181 are the casing 12 and the support part 13 exemplified in the first embodiment, its modification, or the second embodiment.
  • the auricle 1020 is sandwiched between the structural parts 5171 and 5181 and the mounting parts 5172 and 5182, thereby fixing the acoustic signal output devices 5170 and 5180 to the auricle 1020.
  • the acoustic signal output device 5190 illustrated in FIGS. 27A to 27C includes a structural portion 5191 that emits an acoustic signal, and a rod-shaped structure configured to hold the structural portion 5191 and be placed on the back side of the auricle 102 when worn. It has a mounting part 5192.
  • the structural part 5191 is the housing 12 and the support part 13 exemplified in the first embodiment, its modification, or the second embodiment.
  • the mounting portion 5192 holds the structure portion 5191 at one end of the side that is disposed on the lower portion 1024 side of the auricle 1020 when worn.
  • the auricle 1020 is sandwiched between the structural portion 5191 and the mounting portion 5192, thereby fixing the acoustic signal output device 5190 to the auricle 1020.
  • the acoustic signal output device 5200 illustrated in FIGS. 28A to 28E includes a structural part 5201 that emits an acoustic signal, and an annular mounting part 5202 that holds the structural part 5021.
  • the structural part 5201 is the casing 12 and the support part 13 exemplified in the first embodiment, its modification, or the second embodiment.
  • the auricle 1020 When worn, the auricle 1020 is inserted into the annular attachment part 5202, and the attachment part 5202 is arranged on the back side of the upper part 1022, middle part 1023, and lower part 1024 of the auricle 1020. At this time, the auricle 1020 is sandwiched between the structural part 5201 and the mounting part 5202, thereby fixing the acoustic signal output device 5200 to the auricle 1020.
  • the structural part 5251 may be fixed to a rod-shaped mounting part 5352 that is curved in a shape to be mounted on the back of the head and the auricle 1020 of the user 1000.
  • the structural part 5251 is the casing 12 and the support part 13 exemplified in the first embodiment, its modification, or the second embodiment.
  • This attachment part 5352 is attached to the back of the head of the user 1000 and the auricle 1020, and the housing 12 and the support part 13 are arranged as described above.
  • the acoustic signal output device 5600 illustrated in FIG. 29B includes the aforementioned driver unit 11 (not shown), a substantially spherical casing 5612 (structural part) that accommodates the driver unit 11 inside, and an auricle when worn.
  • the mounting portion 5601 has a substantially spherical shape and is disposed in a substantially spherical shape, and a curved portion 5602 is an elastic body that connects the housing 5612 and the mounting portion 5601.
  • the housing 5612 includes a sound hole 121a (first sound hole) that emits (leads out) the acoustic signal AC1 (first acoustic signal) emitted from the driver unit 11 to the outside, and a sound hole 121a (first sound hole) that emits (leads out) the acoustic signal AC1 (first acoustic signal) emitted from the driver unit 11.
  • a sound hole 123a (second sound hole) that emits (leads out) AC2 (second acoustic signal) to the outside is provided.
  • the space may be designed such that the farther the distance from the sound hole 121a is, the higher the sound pressure level of the acoustic signal AC2 emitted to the outside from the sound hole 123a.
  • the housing 5312 is placed on the front side of the auricle (the side where the ear canal is not present) with the sound hole 121a facing toward the ear canal, and the mounting portion 5601 is placed on the back side of the auricle (the side where the ear canal does not exist). ), and the auricle is sandwiched between the housing 5312 and the mounting portion 5601.
  • an acoustic signal output device of a type that is partially mounted inside the ear canal but does not completely seal the ear canal is exemplified.
  • the acoustic signal output device 5300 of this example includes the driver unit 11 described above, a casing 5312 (structural part) that accommodates the driver unit 11 inside, and a It has a support part 5313 (structural part) arranged in the ear canal of a person.
  • the housing 5312 is a hollow member having a wall portion on the outside, and houses the driver unit 11 inside.
  • the driver unit 11 is fixed to the end of the housing 5312 on the D1 direction side.
  • the shape of the housing 5312 is also not limited.
  • the wall of the housing 5312 includes a sound hole 121a (first sound hole) that emits (leads out) the acoustic signal AC1 (first acoustic signal) emitted from the driver unit 11 to the outside, and a sound hole 121a (first sound hole) that emits (leads out) the acoustic signal AC1 (first acoustic signal) emitted from the driver unit 11.
  • a sound hole 123a (second sound hole) that emits (leads out) the acoustic signal AC2 (second sound signal) to the outside is provided.
  • the sound hole 121a (first sound hole) in this example is located in a region AR1 (first region) of a wall portion disposed on one side of the driver unit 11 (the side in the D1 direction, which is the side from which the acoustic signal AC1 is emitted). It is provided.
  • the sound hole 121a in this example is arranged at an eccentric position shifted from the axis A1 (the central axis of the structure) in the B1 direction (first direction), and opens in the D1 direction.
  • the axis A1 is an axis extending in the D1 direction through the central region of the housing 5312
  • the B1 direction is a specific radial direction centered on the axis A1.
  • the edge of the open end of the sound hole 121a has an elliptical shape (the open end is elliptical).
  • the shape of the edge of the sound hole 121a may be a circle, a square, a triangle, or other shapes.
  • the end portions of the sound holes 121a may have a mesh shape.
  • the end portion of the sound hole 121a may be constituted by a plurality of holes.
  • one sound hole 121a is provided in the area AR1 (first area) of the wall portion of the housing 5312.
  • two or more sound holes 121a may be provided in the area AR1 (first area) of the wall of the housing 5312.
  • the sound hole 123a (second sound hole) in this example is located between a region AR1 of the wall of the housing 5312 and a wall disposed on the D2 direction side of the driver unit 11 (the other side from which the acoustic signal AC2 is emitted). It is provided in a region AR3 of the wall portion 123 that is in contact with a region between the region AR2 and the region AR2 of the wall portion 123. Further, the sound hole 123a (second sound hole) in this example is arranged biased toward the B2 direction (second direction) side.
  • the B2 direction (second direction) is a direction including a component in the opposite direction to the B1 direction (first direction).
  • the support portion 5313 is a convex portion provided on the outer surface of the wall portion of the housing 5312 in the D1 direction. At least a portion of the outer surface area of the support portion 5313 has a convex shape.
  • the outer surface area of the support portion 5313 is an area on the outer surface side surrounding the open end 131b of the sound hole 121a (first sound hole).
  • the outer surface region of the support portion 5313 includes a region 53131 (first region) and a region 53132 (second region) protruding from the region 53131 (first region).
  • the outer surface area of the support part 5313 is configured in a shape that guides the acoustic signal AC1 (first acoustic signal) emitted from the sound hole 121a (first sound hole) toward the area 53131 (first area). Good too.
  • the support portion 5313 including the region 53131 and the region 53132 in this example is provided on the B1 direction side, and the support portion 5313 is not provided in the region 5314 on the B2 direction side including the opposite direction component.
  • ⁇ Installed state> The difference from the first embodiment is that when the acoustic signal output device 5300 is worn, the tip of the housing 5312 on the support portion 5313 side is inserted into the user's ear canal.
  • a region 5314 on the B2 direction side where the support portion 5313 is not provided comes into contact with the inside of the external auditory canal.
  • the region 53132 (second region) of the support portion also contacts the inside of this external auditory canal.
  • the region 53131 (first region) of the support portion does not contact the inside of the external auditory canal.
  • a gap is created between the region 53131 and the inside of the external auditory canal, so that the external auditory canal is not sealed. Therefore, there is an advantage that the user can easily hear external sounds.
  • a part of the acoustic signal AC1 emitted from the open end 131b of the sound hole 121a is emitted to the outside from the gap between the region 53131 and the inside of the ear canal.
  • the acoustic signal AC1 emitted to the outside in this way is perceived as sound leakage, but as explained in the first embodiment, this acoustic signal AC1 is canceled out by the acoustic signal AC2 emitted from the sound hole 123a, and this This suppresses sound leakage.
  • the acoustic signal AC2 emitted from the sound hole 123a enters the inside of the external auditory canal through the gap between the region 53131 and the inside of the external auditory canal. It's hard to do. Therefore, the acoustic signal AC1 is not canceled out much in the ear canal, and the user can hear the acoustic signal AC1 with sufficient sound quality.
  • a battery case for storing and charging the acoustic signal output device 5300 may be prepared. In this case, the design may be made according to the convex shape provided on the support part.
  • the convex shape when the acoustic signal output device 5300 is stored in the battery case, only the area where the convex shape is contacted may be designed to be deeper than the area where the other areas of the support part are contacted.
  • the convex shape When the convex shape is made of a material whose shape can be changed, the convex shape holds the acoustic signal output device 5300 in the battery case when the acoustic signal output device 5300 is stored in the battery case. For example, it may be designed to be smaller than the size including the convex shape by a predetermined size.
  • Example 4-2 a support portion 5313 is provided on the B1 direction side of the outer surface of the wall portion on the D1 side of the housing 5312, and a support portion is provided in an area 5314 on the B2 direction side that includes the opposite direction component. (Fig. 30A). However, this region 5314 may be provided with a protruding region surrounding the open end 131b of the sound hole 121a. The protruding region surrounding the open end 131b is, for example, an annular convex region surrounding the B2 direction side of the open end 131b.
  • the acoustic signal output device 5300 when the acoustic signal output device 5300 is attached, most or the entire annular convex region surrounding the B2 direction side of the open end 131b contacts the inside of the external auditory canal, and the sound emitted from the open end 131b of the sound hole 121a is suppressed. It is desirable that the signal AC1 does not leak in the B2 direction as much as possible.
  • a sound hole is provided on the outer surface of the wall on the D1 side of the housing 5312, as in the acoustic signal output device 5400 illustrated in FIGS. 31A to 31C.
  • 53123b (for example, a through hole) may be provided.
  • the sound hole 53123b takes in external sound into the ear canal and emits the acoustic signal AC1 emitted inside the housing 5312 to the outside.
  • the sound hole 53123b in this example is provided on the B1 direction side, and no sound hole 53123b is provided in the region 5314 on the B2 direction side that includes a component in the opposite direction.
  • the distal end portion of the casing 5312 When the distal end portion of the casing 5312 is inserted into the external auditory canal when the acoustic signal output device 5400 is worn, the distal end portion of the casing 5312 comes into contact with the inside of the external auditory canal. Further, the sound hole 53123b is arranged on the outside of the external auditory canal, so that the external auditory canal is not sealed. Therefore, there is an advantage that the user can easily hear external sounds. On the other hand, a part of the acoustic signal AC1 emitted from the open end 131b of the sound hole 121a is emitted to the outside from the sound hole 53123b.
  • the acoustic signal AC1 emitted to the outside in this way is perceived as sound leakage, but as explained in the first embodiment, this acoustic signal AC1 is canceled out by the acoustic signal AC2 emitted from the sound hole 123a, and this This suppresses sound leakage. Further, since the sound hole 123a in this example is arranged biased toward the B2 direction side, the acoustic signal AC2 emitted from the sound hole 123a is difficult to enter the inside of the external auditory canal through the sound hole 53123b. Therefore, the acoustic signal AC1 is not canceled out much in the ear canal, and the user can hear the acoustic signal AC1 with sufficient sound quality.
  • the acoustic signal output device 5500 of this example includes the driver unit 11 described above and a housing 5512 (structural portion) that houses the driver unit 11 therein.
  • the housing 5512 includes an insertion portion 5512a that is inserted into the external auditory canal when worn, and an external placement portion 5512b that is placed in any part of the auricle.
  • the insertion portion 5512a is provided with a through hole 55121 that passes through the insertion portion 5512a. As a result, even when the insertion portion 5512a is inserted into the external auditory canal, the external auditory canal is opened to the outside through the through hole 55121 and is not sealed.
  • the external shape of the inserting portion 5512a in FIGS. 32A and 32B is a donut shape with a through hole 55121
  • the external shape of the inserting portion 5512a may be a prismatic shape with a through hole 55121 (for example, a prismatic shape with a through hole 55121). shape, triangular prism shape, etc.).
  • One or more sound holes 121a are provided on one side of the insertion portion 5512a (the side inserted into the external auditory canal when worn: the D1 direction side).
  • one or more sound holes 123a are provided on the other side (D2 direction side) of the insertion portion 5512a.
  • the sound hole 121a emits the acoustic signal AC1 emitted from the driver unit 11 to the outside
  • the sound hole 123a emits the acoustic signal AC2 emitted from the driver unit 11 to the outside.
  • the space may be designed so that the farther the distance from the sound hole 121a is, the higher the sound pressure level of the acoustic signal AC2 emitted to the outside from the sound hole 123a.
  • the insertion portion 5512a of the housing 5512 is inserted into the external auditory canal, and the external placement portion 5512b is placed in any part of the auricle.
  • the external auditory canal is not sealed by the through hole 55121 of the insertion portion 5512a. Therefore, there is an advantage that the user can easily hear external sounds.
  • a part of the acoustic signal AC1 emitted from the open end 131b of the sound hole 121a is emitted to the outside from the through hole 55121.
  • the acoustic signal AC1 emitted to the outside in this way is perceived as sound leakage, but as explained in the first embodiment, this acoustic signal AC1 is canceled out by the acoustic signal AC2 emitted from the sound hole 123a, and this This suppresses sound leakage.
  • Example 4-5 Any of Examples 4-1 to 4-4 may be combined with Design Examples 1 to 6 of the second embodiment. That is, in any of Examples 4-1 to 4-4, the resonant frequency of the hollow part of the housings 5312 and 5512 is equal to or higher than a predetermined frequency (for example, equal to or higher than a band where human auditory sensitivity is high; for example, equal to or higher than 6 kHz).
  • the acoustic signal AC2 (second acoustic signal) is designed to The sound may be designed to be emitted to the outside from the sound hole 123a (second sound hole).
  • the structural part 5781 may be fixed to a rod-shaped mounting part 5782 that is curved into a shape that is worn on the shoulder or neck of the user 1000.
  • the structural portion 5781 is, for example, one of the acoustic signal output devices 5300, 5400, and 5500 of Examples 4-1 to 4-5.
  • an acoustic signal output device having a housing (structure) having a substantially cylindrical shape with both end surfaces.
  • the housing of the acoustic signal output device may have another shape.
  • This embodiment exemplifies an acoustic signal output device that is integrated with eyeglasses (glasses), and the components of the eyeglasses function as a housing (structural part).
  • FIGS. 34A to 36 illustrate an acoustic signal output device 6100 integrated with glasses.
  • the acoustic signal output device 6100 of this embodiment is in the shape of glasses, and includes temples 6111 and 1221, front cells 6112 and 6122, and a front frame 6131.
  • One ends of the temples 6111 and 6121 are attached to both edges of the front frame 6131, and the other ends of the temples 6111 and 6121 are connected to one ends of the front cells 6112 and 6122.
  • the insides of the temples 6111 and 6121 (structural parts) are hollow, and each accommodates the driver unit 11. That is, the temples 6111 and 6121 (structural parts) also serve as the casing.
  • the driver unit 11 emits the acoustic signal AC1 from the surface 111 on one side and the acoustic signal AC2 from the surface 112 on the other side.
  • the audio signal AC1 is a signal for the user 1000 to listen to audio.
  • the acoustic signal AC2 is an antiphase signal of the acoustic signal AC1 or an approximation signal of the antiphase signal, and is a signal for suppressing sound leakage to the surroundings.
  • the temples 6111 and 1221 are each provided with a sound hole 121a (first sound hole) for emitting the acoustic signal AC1 emitted from the inside of the temple 6111 and 1221 from the one side surface 111 of the driver unit 11 to the outside.
  • a sound hole 121a (first sound hole) for emitting the acoustic signal AC1 emitted from the inside of the temple 6111 and 1221 from the one side surface 111 of the driver unit 11 to the outside.
  • one sound hole 121a is provided on each of the lower surfaces 6111d and 6121d of the temples 6111 and 1221, respectively.
  • Lower surfaces 6111d and 6121d of the temples 6111 and 1221 are connected to lower surfaces 6112d and 6122d of the previous cells 6112 and 6122, respectively.
  • the lower surfaces 6111d and 6121d of the temples 6111 and 1221 are surfaces arranged on the lower side when the user 1000 wears the acoustic signal output device 6100. Further, the lower surfaces 6112d and 6122d of the first cells 6112 and 6122 are surfaces that are supported by the auricles of both ears of the user 1000 (for example, contact surface).
  • each of the temples 6111 and 1221 is provided with a plurality of sound holes 123a.
  • one sound hole 123a is provided on each side surface 6111b and top surface 6111a of the temple 6111. That is, in this example, two sound holes 123a are provided in the temple 6111.
  • one sound hole 123a is provided on each side surface 6121b and top surface 6121a of the temple 6121.
  • the temple 6121 is provided with two sound holes 123a.
  • the upper surfaces 6111a and 6121a of the temples 6111 and 1221 are surfaces arranged on the upper side when the user 1000 wears the acoustic signal output device 6100. That is, the upper surfaces 6111a and 6121a are surfaces disposed on the opposite sides of the lower surfaces 6111d and 6121d, respectively.
  • the lower surfaces 6112d and 6122d of the first cells 6112 and 6122 are surfaces that are supported by the auricles of both ears of the user 1000 (for example, contact surface).
  • the side surface 6111b of the temple 6111 and the side surface 6121b of the temple 6121 are surfaces facing outward when the user 1000 wears the acoustic signal output device 6100 (FIG. 36). That is, when the user 1000 wears the acoustic signal output device 6100, the side surface 6111c of the temple 6111 and the side surface 6121c of the temple 6121 face inward (to the user 1000 side), and the side surface 6111b and the side surface located on the opposite side to the side surface 6111c A side surface 6121b located opposite to 6121c faces outside of the user 1000.
  • one of the sound holes 123a provided in the temple 6121 is placed in one ear of the user 1000 (for example, The sound pressure of the acoustic signal AC2 emitted from the sound hole 123a on the side closer to the external auditory canal 1021 (the sound hole 123a whose distance from the external auditory canal 1021 is dis1; for example, the sound hole 123a provided in the side surface 6121b) of the left ear)
  • the sound hole 123a on the far side from the external auditory canal 1021 of the one ear of the user 1000 the sound hole 123a whose distance from the external auditory canal 1021 is dis2.
  • the sound hole provided on the upper surface 6121a The sound pressure of the acoustic signal AC2 emitted from the hole 123a) is lower than that of the acoustic signal AC2.
  • the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a closest to the external auditory canal 1021 of one ear of the user 1000 is The sound pressure is lower than that of the acoustic signal AC2 emitted from the other sound holes 123a.
  • one of the sound holes 123a provided in the temple 6111 is located near the external auditory canal of the other ear (for example, the right ear) of the user 1000.
  • the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a on the side is lower than the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a on the side far from the external auditory canal of the other ear of the user 1000. It is configured.
  • the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a closest to the external auditory canal of the other ear of the user 1000 is set in the temple 6111.
  • the sound pressure of the sound signal AC2 is configured to be lower than the sound pressure of the sound signal AC2 emitted from the other sound holes 123a.
  • the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a may be adjusted by adjusting the opening area, shape, depth, etc. of the sound hole 123a, or by adjusting the sound absorbing material attached to the sound hole 123a.
  • the adjustment may be made by adjusting the path or distance from the driver unit 11 to the sound hole 123a, or by emitting acoustic signals AC2 generated by a plurality of driver units 11 with different outputs from a plurality of sound holes 123a. or may be adjusted by other methods.
  • the acoustic signal AC2 emitted from the sound hole 123a close to the external auditory canal cancels out a part of the acoustic signal AC1 in the external auditory canal, and it is possible to prevent the sound quality heard by the user 1000 from deteriorating.
  • a plurality of sound holes 123a are provided in each of the temples 6111 and 1221, sound leakage of the sound signal AC1 can be sufficiently suppressed by the sound signal AC2 emitted from the sound holes 123a.
  • the distance between the upper surface 6111a and the lower surface 6111d in the region 6111e of the temple 6111 on the side of the previous cell 6112 is the same as the distance between the upper surface 6111a and the lower surface 6111d in the region 6111f that is closer to the previous cell 6112 than the region 6111e.
  • the temple 6111 is formed in a tapered shape from the region 6111e to the region 6111f, for example.
  • the sound hole 121a of this embodiment is arranged between the region 6111e and the region 6111f of the lower surface 6111d.
  • the region 6111e protrudes in the direction of the lower surface 6111d (direction D1) than the region 6111f (first region), and absorbs the acoustic signal AC1 (first region) emitted from the sound hole 121a (first sound hole). 1 acoustic signal) to the region 6111f (first region) side (B1 direction side).
  • the distance between the upper surface 6121a and the lower surface 6121d in the region 6121e of the temple 6121 on the side of the previous cell 6122 is the same as the distance between the upper surface 6121a and the lower surface 6121d in the region 6121f, which is closer to the previous cell 6122 than the region 6121e. greater than the interval.
  • the temple 6121 is formed in a tapered shape from the region 6121e to the region 6121f, for example.
  • the sound hole 121a of this embodiment is arranged between the region 6121e and the region 6121f of the lower surface 6121d. That is, the region 6121e (second region) protrudes in the direction of the lower surface 6121d (direction D1) than the region 6121f (first region), and receives the acoustic signal AC1 (first region) emitted from the sound hole 121a (first sound hole). 1 acoustic signal) to the region 6121f (first region) side (B1 direction side).
  • the acoustic signal AC1 emitted from each sound hole 121a is guided to the external auditory canal side.
  • the sound hole 123a facing in a direction close to the axial direction of the ear canal of the user 1000 The sound pressure of the acoustic signal AC2 emitted from the ear canal may be lower than the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a facing away from the axial direction of the ear canal.
  • the sound hole facing in a certain direction is, for example, a sound hole opening in that direction, a sound hole in the axial direction of the direction, a sound hole having an opening surface perpendicular to the direction, and the like.
  • one sound hole 121a is provided on each of the lower surfaces 6111d and 6121d of the temples 6111 and 1221, and one sound hole 123a is provided on each of the lower surfaces 6111d and 6121d of the temples 6111 and 1221,
  • One sound hole 123a may be provided on each of the side surfaces 6111b and 6121b.
  • one of the user's 1000 ears (for example, the left ear) out of the sound holes 123a provided in the temple 6121 Sound hole 123a facing in a direction close to the axial direction of the external auditory canal 1021 (sound hole 123a facing in a direction where the angle with the axial direction of the external auditory canal 1021 is ⁇ 1.
  • the sound hole 123a provided on the lower surface 6111d The sound pressure of the acoustic signal AC2 emitted from the sound hole 123a faces in a direction away from the axial direction of the external auditory canal 1021 (the sound hole 123a faces in a direction where the angle made with the axial direction of the external auditory canal 1021 is ⁇ 2) However, ⁇ 2> ⁇ 1.
  • the sound pressure is configured to be lower than the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a provided in the side surface 6121b.
  • the acoustic signal output device 6200 FIG.
  • the sound hole facing the direction closest to the axial direction of the external auditory canal 1021 is configured to be lower than the sound pressure of the acoustic signal AC2 emitted from the other sound holes 123a.
  • the distances between the external auditory canal 1021 and each sound hole 123a provided in the temple 6121 may or may not be the same.
  • the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a facing in a direction close to the axial direction of the external auditory canal is the same as the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a facing in a direction away from the axial direction of the external auditory canal. It is designed to be lower than the pressure.
  • the sound is emitted from the sound hole 123a provided in the temple 6111 that faces the direction closest to the axial direction of the ear canal.
  • the sound pressure of the acoustic signal AC2 is configured to be lower than the sound pressure of the acoustic signal AC2 emitted from the other sound holes 123a.
  • the distances between the external auditory canal and each sound hole 123a provided in the temple 6111 may or may not be the same. The rest is the same as the fifth embodiment.
  • the number of sound holes 121a (first sound hole) and sound holes 123a (second sound hole), and their positions and orientations are not limited to the fifth embodiment or its first modification.
  • at least one of the sound holes 121a and 123a may be placed on the front cell 6112 and 6122, or on the other surface of the temple 6111 and 6121. good.
  • At least one of the sound holes 121a, 123a may be installed in an area close to the front frame 6131 of the temples 6111, 6121, or may be installed in an area close to the front cells 6112, 6122, or may be installed in the front frame 6131. may be done.
  • At least one of the temples 6111 and 6121, the front cells 6112 and 6122, and the front frame 6131 is arranged so that the acoustic signal AC1 is emitted from the sound hole 121a and the acoustic signal AC is emitted from the sound hole 123a.
  • It is configured to be hollow, and the driver unit 11 is housed inside. Further, it is desirable that the sound hole 123a is not provided in the area closest to the user's 1000 external auditory canal when the user 1000 wears the acoustic signal output device.
  • the sound hole located closest to the ear canal when the user 1000 wears the sound signal output device is not the sound hole 123a
  • the sound hole 121a is the sound hole 121a.
  • the sound hole that faces the direction closest to the axial direction of the external auditory canal when the user 1000 wears the sound signal output device is the sound hole 123a. It is preferable that the sound hole 121a be used instead of the sound hole 121a.
  • the acoustic signal when the user 1000 wears the acoustic signal output device among the sound holes 123a provided in the acoustic signal output device, the acoustic signal is emitted from the sound hole 123a located closest to the ear canal. It is desirable that the sound pressure of AC2 is smaller than the sound pressure of the acoustic signal AC2 emitted from the other sound holes 123a.
  • the sound hole 123a facing the direction closest to the axial direction of the external auditory canal emits the sound signal AC2. It is desirable that the sound pressure is smaller than the sound pressure of the acoustic signal AC2 emitted from the other sound holes 123a.
  • the acoustic signal output device 6400 of this embodiment includes temples 6111 and 1221, front cells 6112 and 6122, and a front frame 6131.
  • One ends of the temples 6111 and 6121 are attached to both edges of the front frame 6131, and the other ends of the temples 6111 and 6121 are connected to one ends of the front cells 6112 and 6122.
  • the insides of the temples 6111 and 6121 are hollow, and each accommodates the driver unit 11.
  • each of the temples 6111 and 1221 has a sound hole 121a (a first sound hole).
  • the temples 6111 and 1221 are each provided with a sound hole 123a (second sound hole) for emitting the acoustic signal AC2 emitted from the inside of the temple 6111 and 1221 from the other side surface 112 of the driver unit 11 to the outside.
  • a sound hole 123a (second sound hole) for emitting the acoustic signal AC2 emitted from the inside of the temple 6111 and 1221 from the other side surface 112 of the driver unit 11 to the outside.
  • one sound hole 123a is provided on each side surface 6111b, 6121b of the temples 6111, 1221.
  • the temples 6111 and 1221 may be provided with a plurality of sound holes 123a, as illustrated in the fifth embodiment and its modifications.
  • the temples 6111 and 1221 each have movable parts 6415 and 6425 for changing the opening area of at least one sound hole 123a.
  • the movable parts 6415 and 6425 may have any mechanical configuration as long as the opening area of the sound hole 123a can be changed.
  • a configuration in which the opening area of the sound hole 123a is changed by sliding the movable parts 6415 and 6425 is illustrated.
  • the movable parts 6415, 6425 are movable in the D5 direction with respect to the temples 6111, 1221, and the sound hole The opening area of 123a can be changed. That is, as illustrated in FIG.
  • the opening area of the sound hole 123a can be maximized. As illustrated in FIG. 40B, the opening area of the sound hole 123a can be reduced by the movable parts 6415, 6425 covering a part of the sound hole 123a. Furthermore, the sound hole 123a may be closed by the movable parts 6415, 6425 completely covering the sound hole 123a as shown in FIG. 40C.
  • the opening area of at least one sound hole 123a variable, the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a can be changed, and the sound pressure of the acoustic signal AC2 emitted from the sound hole 121a can be changed.
  • the degree to which AC1 is offset can be controlled. In an environment where there is no need to suppress sound leakage of the acoustic signal AC1, all sound holes 123a may be closed.
  • the configuration may be such that the user 1000 can manually move the movable parts 6415, 6425, or the configuration may be such that the movable parts 6415, 6425 can be moved by power from a motor or the like.
  • the relative positions of the movable parts 6415 and 6425 with respect to the sound hole 123a may be able to be changed continuously or may be changed discretely.
  • the sound hole 123a may be designed so that the opening area and shape of the sound hole 123a can be set to a plurality of predetermined sizes and shapes. . Thereby, it is possible to achieve a sound leakage suppression effect that is optimized in advance according to the environment.
  • the movable parts 6415, 6425 may move in any direction.
  • the movable parts 6415 and 6425 may move in the D5 direction (horizontal direction in FIG. 40A, etc.), a direction perpendicular thereto (vertical direction in FIG. 40A, etc.), or a combination thereof (for example, in FIG. 40A, etc.). It may also move in diagonal directions such as
  • the movable parts 6415, 6425 not only move in a one-dimensional direction (for example, the D5 direction in FIGS. 40A to 40C), but also move in a two-dimensional direction (for example, along the plane including the opening of the sound hole 123a (for example, the side surface 6121b)).
  • the degree and direction of sound leakage of the acoustic signal AC1 caused by the acoustic signal AC2 emitted from the sound hole 123a can be controlled in detail.
  • a plurality of movable parts 6415, 6425 that can move in different directions with respect to one sound hole 123a are provided, and it is possible to cover the sound hole 123a with these plurality of movable parts 6415, 6425. It's okay. Thereby, the degree of freedom in the opening shape and opening position of the sound hole 123a is further improved, and the degree and direction of sound leakage of the acoustic signal AC1 can be controlled in more detail.
  • a plurality of sound holes 123a may be provided in each of the temples 6111 and 1221, and movable parts 6415 and 6425 may be provided to change the opening area of the sound holes 123a.
  • One or more sound holes 123a may be provided in the front cells 6112, 6122 and the front frame 6131, and movable parts 6415, 6425 may be provided to change the opening areas of these sound holes 123a.
  • any one of the plurality of sound holes 123a (for example, the sound holes 123a provided on the top surfaces 6111a and 6121a and the sound holes 123a provided on the side surfaces 6111b and 6121b) that open in different directions.
  • the directivity of the acoustic signal AC2 emitted from these sound holes 123a may be changed. That is, the opening direction of the sound hole 123a may be changed by the movable parts 6415 and 6425.
  • a movable part that changes the opening area and shape of the sound hole 123a may be provided.
  • a movable part in the shape of a shutter diaphragm may be provided, or a movable part in other shapes may be provided.
  • the present invention is not limited to the above-described embodiments.
  • the casing 12 and the support section 13 are separate bodies, but the casing 12 and the support section 13 may be configured integrally.
  • the sound hole 123a may not be provided in the housing 12. Even in such a case, when the housing 12 and the support section 13 (structural section) are attached to the auricle 1010 of the user 1000, the region 132 (second region) of the support section 13 is attached to the auricle 1010 (body).
  • the opening end 131b of the sound hole 121a (first sound hole) and the region 131 (first region) of the support part 13 contact at least a part of the auricle 1010 (body).
  • the region 131 (first region) is arranged on the external auditory canal 1011 side. At this time, the region 131 comes into contact with the auricle 1010 and acts as a support, providing a high sense of stability when worn.
  • the support portion 13 may not be provided.
  • the driver unit 11 was housed inside the housing 12.
  • the driver unit 11 may be arranged outside the housing 12, and the acoustic signals AC1 and AC2 emitted from the driver unit 11 may be introduced into the housing 12 through a waveguide.
  • An acoustic signal output device having a structure provided with one or more first sound holes that emit a first acoustic signal to the outside and one or more second sound holes that emit a second acoustic signal to the outside;
  • the first sound hole is arranged at an eccentric position shifted in a first direction from the central axis of the structure,
  • the sound pressure level of the second acoustic signal emitted from the second sound hole into the first space is lower than the sound pressure level of the second acoustic signal emitted from the second sound hole into the second space
  • the first space is a space located on the first direction side with respect to the first sound hole
  • the second space is a space located on a second direction side with respect to the first sound hole
  • the second direction includes a component in a direction opposite to the first direction
  • an attenuation rate of the first acoustic signal at a second point farther from the acoustic signal output device than the first point It is designed to be less than or equal to a predetermined value that is smaller than the attenuation rate due to air propagation of the acoustic signal at the second point with respect to the first point, or
  • the amount of attenuation of the first acoustic signal at the second point with respect to the first point is It is designed to be at least a predetermined value that is larger than the amount of attenuation due to air propagation of the acoustic signal at the second point based on the first point. Sound signal output device.
  • the acoustic signal output device according to item 11, The total area of the opening ends of the second sound holes facing the first space is smaller than the total area of the opening ends of the second sound holes facing the second space. .
  • a plurality of the second sound holes are provided in the structure, The sound pressure level of the second acoustic signal emitted from the opening end facing the first space among the opening ends of the second sound hole is such that the sound pressure level of the second acoustic signal emitted from the opening end facing the first space is an acoustic signal output device, the sound pressure level being lower than the sound pressure level of the second acoustic signal emitted from the open end facing the.
  • the acoustic signal output device At least a part of the outer surface area surrounding the opening end of the first sound hole has a convex shape,
  • the outer surface region includes a first region and a second region protruding from the first region, and is configured to have a shape that guides the first acoustic signal emitted from the first sound hole toward the first region.
  • acoustic signal output device acoustic signal output device.
  • the opening end of the first sound hole faces a space surrounded by the second region, The first region side of the space surrounded by the second region is open to the outer periphery of the space surrounded by the second region.
  • the acoustic signal output device is an acoustic signal output device, wherein the first region is disposed on the first direction side of the second region.
  • the acoustic signal output device is configured as follows.
  • One or more first sound holes that emit a first sound signal to the outside are provided, and at least a part of an outer surface area surrounding an open end of the first sound hole has a structure having a convex shape;
  • the outer surface region includes a first region and a second region protruding from the first region, and is configured in a shape that guides the first acoustic signal emitted from the first sound hole toward the first region.
  • An acoustic signal output device is provided.
  • the acoustic signal output device according to any one of items 21 to 23,
  • the structure further includes one or more second sound holes that emit a second acoustic signal to the outside, The opening end of the second sound hole faces a space outside the space surrounded by the second region, When the first acoustic signal is emitted from the first sound hole and the second acoustic signal is emitted from the second sound hole, a predetermined first point at which the first sound signal reaches is a reference.
  • an attenuation rate of the first acoustic signal at a second point farther from the acoustic signal output device than the first point It is designed to be less than or equal to a predetermined value that is smaller than the attenuation rate due to air propagation of the acoustic signal at the second point with respect to the first point, or The amount of attenuation of the first acoustic signal at the second point with respect to the first point is An acoustic signal output device designed to have at least a predetermined value that is larger than an amount of attenuation due to air propagation of an acoustic signal at the second point with respect to the first point.
  • One or more first sound holes are provided for emitting a first acoustic signal to the outside, and the structure includes an outer surface area surrounding an open end of the first sound hole; When the structure is attached to the body, a portion of the outer surface area is supported in contact with any part of the body; At least a part of the opening end of the first sound hole does not come into contact with the body, configured to have a shape that guides the first acoustic signal emitted from the first sound hole toward the external auditory canal; Sound signal output device.
  • the acoustic signal output device When the structure is attached to the body, Designed so that the sound pressure level of the first acoustic signal emitted from the structure to the ear canal side is higher than the sound pressure level of the first acoustic signal emitted from the structure to a place other than the ear canal side.
  • An acoustic signal output device When the structure is attached to the body, Designed so that the sound pressure level of the first acoustic signal emitted from the structure to the ear canal side is higher than the sound pressure level of the first acoustic signal emitted from the structure to a place other than the ear canal side.
  • the acoustic signal output device according to item 25 or 26,
  • the structure further includes one or more second sound holes that emit a second acoustic signal to the outside, When the first acoustic signal is emitted from the first sound hole and the second acoustic signal is emitted from the second sound hole, a predetermined first point at which the first sound signal reaches is a reference.
  • an attenuation rate of the first acoustic signal at a second point farther from the acoustic signal output device than the first point It is designed to be less than or equal to a predetermined value that is smaller than the attenuation rate due to air propagation of the acoustic signal at the second point with respect to the first point, or The amount of attenuation of the first acoustic signal at the second point with respect to the first point is An acoustic signal output device designed to have at least a predetermined value that is larger than an amount of attenuation due to air propagation of an acoustic signal at the second point with respect to the first point.
  • the second acoustic signal is designed such that the resonant frequency of the hollow portion is equal to or higher than a predetermined frequency, and the second acoustic signal in which frequency band components including the predetermined frequency are suppressed is emitted to the outside from the second sound hole.
  • Designed acoustic signal output device is designed such that the resonant frequency of the hollow portion is equal to or higher than a predetermined frequency, and the second acoustic signal in which frequency band components including the predetermined frequency are suppressed is emitted to the outside from the second sound hole.
  • the acoustic signal output device includes an internal hollow part disposed in the internal space of the hollow part, An acoustic signal output device, wherein an internal space of the internal hollow part is spatially partitioned from an internal space of the hollow part located outside the internal hollow part.
  • the acoustic signal output device according to item 32, further comprising an electronic member for driving a driver unit that emits at least one of the first acoustic signal and the second acoustic signal, An acoustic signal output device, wherein at least a portion of the electronic member is housed in an internal space of the internal hollow part.
  • the acoustic signal output device according to item 32, further comprising a buffer material disposed between the outside of the internal hollow part and the inside of the hollow part, An acoustic signal output device, wherein the outside of the internal hollow part is fixed to the inside of the hollow part via the cushioning material.
  • the acoustic signal output device according to item 31, The acoustic signal output device further includes a driver unit that emits the second acoustic signal in which frequency band components including the predetermined frequency are suppressed into the internal space of the hollow portion.
  • the acoustic signal output device Either the driver unit emits the second acoustic signal in which the frequency band component including the predetermined frequency is suppressed, into the internal space of the hollow part, or the driver unit emits the second acoustic signal in which the frequency band component including the predetermined frequency is not suppressed. 2.
  • the acoustic signal output device further includes a switching unit that switches between emitting the two acoustic signals into the internal space of the hollow portion.
  • an attenuation rate of the first acoustic signal at a second point farther from the acoustic signal output device than the first point It is designed to be less than or equal to a predetermined value that is smaller than the attenuation rate due to air propagation of the acoustic signal at the second point with respect to the first point, or The amount of attenuation of the first acoustic signal at the second point with respect to the first point is An acoustic signal output device designed to have at least a predetermined value that is larger than an amount of attenuation due to air propagation of an acoustic signal at the second point with respect to the first point.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Multimedia (AREA)
  • Otolaryngology (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
PCT/JP2023/019888 2022-06-14 2023-05-29 音響信号出力装置 Ceased WO2023243379A1 (ja)

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CN202380046498.2A CN119366198A (zh) 2022-06-14 2023-05-29 音响信号输出装置
JP2024528663A JP7794971B2 (ja) 2022-06-14 2023-05-29 音響信号出力装置
KR1020247040868A KR102918138B1 (ko) 2022-06-14 2023-05-29 음향 신호 출력 장치
EP23823676.4A EP4543038A1 (en) 2022-06-14 2023-05-29 Acoustic signal output device
US18/873,418 US20250168557A1 (en) 2022-06-14 2023-05-29 Acoustic signal output device

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CN119366198A (zh) 2025-01-24
KR20250007654A (ko) 2025-01-14
KR102918138B1 (ko) 2026-01-27

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