WO2017199175A1 - Structure acoustique utilisant une unité de membrane passive - Google Patents

Structure acoustique utilisant une unité de membrane passive Download PDF

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Publication number
WO2017199175A1
WO2017199175A1 PCT/IB2017/052901 IB2017052901W WO2017199175A1 WO 2017199175 A1 WO2017199175 A1 WO 2017199175A1 IB 2017052901 W IB2017052901 W IB 2017052901W WO 2017199175 A1 WO2017199175 A1 WO 2017199175A1
Authority
WO
WIPO (PCT)
Prior art keywords
passive diaphragm
diaphragm unit
unit
housing
passive
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/IB2017/052901
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English (en)
Inventor
Shihuang Li
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.)
Tgi Technology Pte Ltd
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Tgi Technology Pte Ltd
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Filing date
Publication date
Application filed by Tgi Technology Pte Ltd filed Critical Tgi Technology Pte Ltd
Publication of WO2017199175A1 publication Critical patent/WO2017199175A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • 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
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/283—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm
    • H04R1/2834—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm for 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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
    • H04R2201/029—Manufacturing aspects of enclosures transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms

Definitions

  • This invention relates to an acoustic structure, and more particularly to an acoustic structure using a passive diaphragm unit.
  • the inversion tube or the passive diaphragm unit is often used to reflect the low-frequency radiation wave on the back of the speaker unit and to superimpose the positive phase wave, thereby improving the low-frequency effect. It can be seen that in this structure, both the inverting tube and the passive diaphragm unit are intended to reflect the low-frequency radiation generated by the loudspeaker unit itself. Therefore, the frequency of the emitted low-frequency radiation is determined by the speaker unit. If sensitivity of the speaker unit itself in the low-frequency side is relatively poor, then the overall low-frequency effect of the speaker will not be excellent.
  • the size of the speaker unit must be enlarged in order to improve the overall low-frequency effect of the conventionally designed speaker.
  • the housing volume of the speaker must be increased correspondingly to match size of the speaker unit. Therefore, the improvement of the low-frequency effect leads to the increase of the speaker volume and the increase of the mass. With the modern home simplicity and the need for lightweight mobile devices, the traditional large-volume and heavy speaker is no longer suitable for use in modern living rooms and mobile devices.
  • the main technical problem to be solved by the present invention is to provide an acoustic structure using a passive diaphragm unit, such that the passive diaphragm unit forms an independent low-frequency radiation source, thereby expanding the low-frequency response range of the loudspeaker unit through the passive diaphragm unit so that the sensitivity of the entire acoustic structure in the low-frequency range can be greatly enhanced.
  • the present invention provides an acoustic structure using a passive diaphragm unit comprising a housing, a speaker unit and at least one passive diaphragm unit.
  • the housing as mentioned above has a closely connected aperture with the speaker unit and the passive diaphragm unit, the passive diaphragm unit as stated above and the cavity inside the housing form an air spring, whose resonant frequency is lower than the resonant frequency of the loudspeaker unit.
  • the air spring is driven by the speaker unit to resonate at its resonant frequency.
  • the effective vibration area of the passive diaphragm unit is more than 30% of the surface area of the housing; the surface area of the above-mentioned housing refers to the spherical surface area after the box is made equivalent to a sphere.
  • the effective vibration area of the mentioned passive diaphragm unit accounts for 35% of the surface area of the housing.
  • the effective vibration area of the mentioned passive diaphragm unit accounts for 40% of the surface area of the housing.
  • the ratio of the effective resonant area of at least one passive diaphragm unit to the effective cone area of the loudspeaker unit is greater than or equal to 3.
  • the ratio of the effective resonant areas of at least one passive diaphragm unit to the effective cone surface area of the loudspeaker unit is greater than or equal to 4.
  • the ratio of the effective resonant areas of at least one passive diaphragm unit to the effective cone surface area of the loudspeaker unit is greater than or equal to 6, but smaller or equal to 8.
  • the mentioned housing is a polygonal body, the in between surfaces on the side facing the cavity mentioned above has a rod.
  • the projection of the rod mentioned above in the vertical direction is a circular arc shape.
  • the projection of the rod mentioned above in the vertical direction is a circular arc shape.
  • it further comprises a fairing.
  • the fairing as mentioned above is arranged within the resonator and is arranged in a coaxial relation with the stated passive diaphragm unit. There is a through-hole connected to the passive diaphragm unit at the axis of the indicated fairing, the remaining parts separate the passive diaphragm unit from the mentioned resonator.
  • it further comprises a fairing.
  • the mentioned fairing is connected one-to-one to the stated passive diaphragm unit and covers the surface of the passive diaphragm unit, and the fairing is provided with an infusion hole connecting the resonator and the passive diaphragm unit at a symmetrical position.
  • This invention provides an acoustic structure using a passive diaphragm unit that breaks through the traditional idea, in which the passive diaphragm unit has replaced the inverted phase structure.
  • the resonant frequency of the passive diaphragm unit is independent of the volume of the speaker housing, the effective resonant area of the passive diaphragm unit and the mass of the passive diaphragm unit are increased, making the resonant point of the air spring formed by the passive diaphragm unit and housing lower than the resonant point of the loudspeaker unit.
  • the air spring is driven by the speaker unit to resonate at its resonant frequency, thereby broadening the frequency response range of the loudspeaker, so that the response sensitivity of the entire acoustic structure at the low-frequency side is greatly enhanced.
  • the sensitivity of the low-frequency side is strengthened by the passive diaphragm unit, it is only necessary for the speaker unit to have a good intermediate-frequency and high- frequency sensitivity, and a force capable of driving the air spring to resonate so that the speaker unit can be relatively small.
  • the cost is relatively low, the volume of the housing can also be decreased accordingly.
  • the present invention provides an acoustic structure using a passive diaphragm unit, and since the resonant area of the passive diaphragm unit is large, it is likely to cause resonance unevenness.
  • a fairing is placed coaxially with the passive diaphragm unit.
  • the periphery of the fairing divides the passive diaphragm unit from the resonator, and there is a through-hole at the axis of the fairing.
  • the airflow inside the resonator after being rectified by the through-hole drives the resonance of the passive diaphragm unit. Because the fairing and the diaphragm unit are coaxially placed, the air pressure and distribution of the airflow out of the fairing is more uniform for the passive diaphragm unit, which can effectively avoid the uneven vibration situation of the passive diaphragm unit.
  • This invention provides an acoustic structure with a passive diaphragm unit, and since the resonant area of the passive diaphragm unit is relatively large, it is possible to produce a good bass without requiring a large vibration amplitude of the passive diaphragm unit. As such, it is not necessary to make the thickness of the resonator very thick. Therefore it is very suitable for the applications in the tablets, televisions, mobile phones and other products, on which the thickness of the product is critical.
  • This invention provides an acoustic structure with a passive diaphragm unit, as the passive diaphragm unit is used to expand the low-frequency response range of the loudspeaker unit, the loudspeaker unit only needs to generate the driving force to drive the air spring for resonance, and therefore, it is not necessary to use a large-size loudspeaker unit. It is easier to be designed as a passive speaker, which further enhance the sound quality of the speaker. Besides, the thickness of the passive speaker can be further reduced.
  • This invention provides an acoustic structure with a passive diaphragm unit, and the housing has a polygonal shape. There is a rod between the sides of the housing, through which the positions of the opposite sides are fixed. As a result, the capacity of the resonator is fixed. Throughout the process of using the speaker, because the capacity of the housing is constant, there is no loss of sound, and sound staining is also greatly kept under control.
  • Figure 1 is an external perspective view of the chosen application 1 of the this invention.
  • Figure 2 is a schematic cross-sectional view of the chosen application 1 of the this invention.
  • Figure 3 is a frequency response curve of a conventional passive diaphragm speaker compared to the chosen application 1 of the this invention
  • Figure 4 is an external perspective view of the chosen application 3 of the this invention.
  • Figure 5 is a schematic cross-sectional view of the chosen application 3 of the this invention.
  • an acoustic structure with a passive diaphragm unit includes a housing 1, a speaker unit 2 and two passive diaphragm units 3, wherein the size of the passive diaphragm unit 3 is two 2-inch of the passive diaphragm unit.
  • the size of the speaker unit is 1.5 inch.
  • the ratio of the effective resonant surface area of the two passive diaphragm units 3 to the effective cone surface area of the loudspeaker unit is about 3.5.
  • the housing 1 has a closely connected aperture with the mentioned speaker unit 2 and the passive diaphragm unit 3.
  • the housing 1 is cylindrical, and the speaker unit 2 is mounted on the bottom surface of the housing 1, and two passive diaphragm units 3 are located at the side of the housing 1.
  • the mentioned passive diaphragm unit 3 and the cavity 11 inside the housing form an air spring, whose resonant frequency is lower than the resonant frequency of the speaker unit 2.
  • the size of the speaker unit 2 is minuscule. Most of the surface area of the entire housing is occupied by the passive diaphragm unit. In this application, the surface area of the passive diaphragm unit 3 accounts for 30% of the surface area of the housing. If a larger passive diaphragm unit 3 is selected, this ratio will be further increased to, for example, 35%, 40%, 45%, 60% and etc. This is entirely different from the design of the traditional speaker, where speaker unit 2 occupies the most surface area of the housing.
  • the light-colored curve in Figure 3 is the frequency response curve of the speaker with a conventional passive diaphragm.
  • the ratio of the effective resonant areas of the two passive diaphragm units 3 to the effective cone surface area of the loudspeaker unit is less than 2.
  • the dark-coloured curve is the frequency response curve of the speaker in the present application.
  • the frequency response curve of the two speakers intersect. From this point to the low-frequency direction, the sensitivity of the traditional passive diaphragm speaker decreases very fast, at 90Hz, the sensitivity difference between the two speakers reaches a maximum of about 7db. This is an enormous difference.
  • the traditional passive diaphragm speaker shows another turning point at about 75Hz, where the sensitivity decreases rapidly. In other words, when the frequency is lower than 70Hz, the sensitivity of traditional passive diaphragm speaker is very low, and the bass effect is very limited. The speaker of this application reaches the turning point when it reaches 60 Hz, and it is undoubtedly better in the low-frequency range.
  • the resonant frequency of the air spring can be further reduced by further increasing the weight of the passive diaphragm unit 3, as the size of the passive diaphragm unit 3 is further increased so that a better low-frequency effect can be achieved.
  • This application will not be further elaborated here. Only corresponding adjustments are required based on the above-described structure for further implementation.
  • the fairing 4 is also included in this application.
  • the fairing 4 is located inside the cavity 11 and is coaxially arranged with the passive diaphragm unit 3.
  • a fairing 4 located coaxially with the passive diaphragm unit 3 is designed.
  • the periphery of the fairing 4 separates the passive diaphragm unit 3 from the cavity 11, and the airflow inside the cavity 11 can only be rectified by the through-hole 41 to drive the passive diaphragm unit 3 to resonate.
  • the air pressure and distribution of the airflow from the through-hole 41of the fairing 4 is relatively uniform for the passive diaphragm unit 3, which effectively preventing the vibration of the passive diaphragm unit 3 from becoming uneven.
  • the frequency response in the low-frequency range of the speaker unit 2 is extended by the use of the passive diaphragm unit 3, it is not necessary to use a large-size loudspeaker unit 2. It is easier to be designed as a passive speaker, and the sound quality of the speaker can be further enhanced. The thickness of the passive speaker can be further reduced.
  • the ratio of the effective resonant areas of the two passive diaphragm units 3 to the effective cone surface area of the loudspeaker unit is about 3.5.
  • the ratio can be further increased to such as 4, 6, 8 and etc. With the increase of this ratio, the effect of improving the low frequency becomes more evident.
  • the housing is a polygonal body, and between surfaces on the side facing the cavity mentioned above there is a rod.
  • the projection of the rod mentioned above in the vertical direction is a circular arc shape.
  • the positions of the opposite sides are fixed.
  • the capacity of the resonator is fixed.
  • the capacity of the housing is constant, there is no loss of sound, and sound staining is also greatly kept under control.
  • this application differs from application 1 in that an ultra-thin speaker is designed in the present application. Since the resonant area of the passive diaphragm unit 3 is relatively large, it is possible to produce a good bass without generating a large vibration amplitude by the passive diaphragm unit 3, and it is not necessary to make the thickness of the cavity 11 very thick.
  • the thickness of the housing can be made as small as possible, making it ideal for products such as tablets, televisions, and mobile phones, for which the thickness is critical.
  • the present application is different from application 3 in that in this application, the fairing covers the surface of the mentioned passive diaphragm unit.
  • the fairing is designed with an infusion hole connecting the resonator and the passive diaphragm unit at a symmetrical position.
  • the fairing in application 3 needs a particular distance from the passive diaphragm unit so as to ensure that there is sufficient space for the distribution of airflow after passing the through-hole, thereby driving the passive diaphragm unit to vibrate.
  • this design will occupy part of the resonator thickness, and it is disadvantageous for decreasing the thickness of the housing.
  • the airflow from many infusion holes drives the symmetrical positions of the passive diaphragm unit simultaneously, to ensure that the force applied by the air pressure to the passive diaphragm unit is uniform, and therefore it is not necessary to separate the fairing far from the passive diaphragm unit.
  • the size of the housing can be made thinner.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)

Abstract

La présente invention concerne une structure acoustique pourvue d'une unité de membrane passive comprenant : un boîtier, une unité de haut-parleur et au moins une unité de membrane passive. Le boîtier tel que mentionné ci-dessus a une ouverture reliée étroitement avec l'unité de haut-parleur et l'unité de membrane passive, l'unité de membrane passive telle qu'indiquée ci-dessus et la cavité à l'intérieur du boîtier forment un ressort pneumatique, dont la fréquence de résonance est inférieure à la fréquence de résonance de l'unité de haut-parleur. La cavité dans le boîtier mentionné constitue la cavité de l'unité de haut-parleur et de l'unité de membrane passive. Le rapport de la zone de résonance effective de l'unité de membrane passive sur la zone de cône effective de l'unité de haut-parleur est supérieur ou égal à 3. La présente invention concerne une structure acoustique utilisant une unité de membrane passive, de telle sorte que l'unité de membrane passive forme une source de rayonnement à basse fréquence indépendante, permettant ainsi d'étendre la plage de réponse à basse fréquence de l'unité de haut-parleur à travers l'unité de membrane passive de telle sorte que la sensibilité de la totalité de la structure acoustique dans la plage à basse fréquence peut être considérablement améliorée.
PCT/IB2017/052901 2016-05-18 2017-05-17 Structure acoustique utilisant une unité de membrane passive Ceased WO2017199175A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610331305.XA CN106028213A (zh) 2016-05-18 2016-05-18 一种使用被动振膜单元的声学结构
CN201610331305.X 2016-05-18

Publications (1)

Publication Number Publication Date
WO2017199175A1 true WO2017199175A1 (fr) 2017-11-23

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PCT/IB2017/052901 Ceased WO2017199175A1 (fr) 2016-05-18 2017-05-17 Structure acoustique utilisant une unité de membrane passive

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WO (1) WO2017199175A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109803215B (zh) 2018-12-18 2021-01-22 歌尔股份有限公司 声学装置及电子设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040231911A1 (en) * 2003-04-04 2004-11-25 Welker Andrew C. Outdoor loudspeaker with passive radiator
US20110158459A1 (en) * 2009-12-25 2011-06-30 Foxconn Technology Co., Ltd. Loudspeaker and electronic device incorporating the same
US20120014542A1 (en) * 2010-07-14 2012-01-19 Kabushiki Kaisha Audio-Technica Narrow directional condenser microphone
WO2013100862A2 (fr) * 2011-12-31 2013-07-04 Shihuang Li Haut-parleur à vibration symétrique
WO2013100863A2 (fr) * 2011-12-31 2013-07-04 Shihuang Li Unité de haut-parleur à membrane coaxiale et haut-parleur à membrane coaxiale symétrique

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3911633B2 (ja) * 2002-12-10 2007-05-09 オー・ジー株式会社 スピーカキャビネット
CN201674658U (zh) * 2010-06-09 2010-12-15 黄荣宗 共振扬声器
CN102395091A (zh) * 2011-09-28 2012-03-28 庄志捷 一种具有驱动单元的平面振膜扬声器
CN102572639A (zh) * 2011-12-31 2012-07-11 李世煌 镜像振动式音箱
CN205754838U (zh) * 2016-05-18 2016-11-30 李世煌 使用被动振膜单元的声学结构

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040231911A1 (en) * 2003-04-04 2004-11-25 Welker Andrew C. Outdoor loudspeaker with passive radiator
US20110158459A1 (en) * 2009-12-25 2011-06-30 Foxconn Technology Co., Ltd. Loudspeaker and electronic device incorporating the same
US20120014542A1 (en) * 2010-07-14 2012-01-19 Kabushiki Kaisha Audio-Technica Narrow directional condenser microphone
WO2013100862A2 (fr) * 2011-12-31 2013-07-04 Shihuang Li Haut-parleur à vibration symétrique
WO2013100863A2 (fr) * 2011-12-31 2013-07-04 Shihuang Li Unité de haut-parleur à membrane coaxiale et haut-parleur à membrane coaxiale symétrique

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