US20110158448A1 - Speakerbox - Google Patents

Speakerbox Download PDF

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Publication number
US20110158448A1
US20110158448A1 US13/040,596 US201113040596A US2011158448A1 US 20110158448 A1 US20110158448 A1 US 20110158448A1 US 201113040596 A US201113040596 A US 201113040596A US 2011158448 A1 US2011158448 A1 US 2011158448A1
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US
United States
Prior art keywords
hermetically sealed
communications unit
air
flexible container
gas
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.)
Abandoned
Application number
US13/040,596
Inventor
Fredrik M. Stenmark
Carl STÂHL
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SnapTrack Inc
Original Assignee
Sony Ericsson Mobile Communications AB
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Filing date
Publication date
Application filed by Sony Ericsson Mobile Communications AB filed Critical Sony Ericsson Mobile Communications AB
Priority to US13/040,596 priority Critical patent/US20110158448A1/en
Publication of US20110158448A1 publication Critical patent/US20110158448A1/en
Assigned to SONY MOBILE COMMUNICATIONS AB reassignment SONY MOBILE COMMUNICATIONS AB CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SONY ERICSSON MOBILE COMMUNICATIONS AB
Assigned to SNAPTRACK, INC. reassignment SNAPTRACK, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Sony Mobile Communications Inc.
Assigned to SONY MOBILE COMMUNICATIONS AB reassignment SONY MOBILE COMMUNICATIONS AB CORRECTIVE ASSIGNMENT TO CORRECT THE EXECUTION DATE PREVIOUSLY RECORDED AT REEL: 036868 FRAME: 0084. ASSIGNOR(S) HEREBY CONFIRMS THE CHANGE OF NAME. Assignors: SONY ERICSSON MOBILE COMMUNICATIONS AB
Assigned to Sony Mobile Communications Inc. reassignment Sony Mobile Communications Inc. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SONY MOBILE COMMUNICATIONS AB
Assigned to SONY ERICSSON MOBILE COMMUNICATIONS AB reassignment SONY ERICSSON MOBILE COMMUNICATIONS AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STAHL, CARL, STENMARK, FREDRIK M.
Assigned to SONY MOBILE COMMUNICATIONS AB reassignment SONY MOBILE COMMUNICATIONS AB CORRECTIVE ASSIGNMENT TO CORRECT THE EXECUTION DATE PREVIOUSLY RECORDED AT REEL: 036868 FRAME: 0084. ASSIGNOR(S) HEREBY CONFIRMS THE CHANGE OF NAME. Assignors: SONY ERICSSON MOBILE COMMUNICATIONS AB
Abandoned legal-status Critical Current

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2803Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means for loudspeaker transducers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/02Constructional features of telephone sets
    • H04M1/03Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets
    • H04M1/035Improving the acoustic characteristics by means of constructional features of the housing, e.g. ribs, walls, resonating chambers or cavities
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2876Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding
    • H04R1/288Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding for loudspeaker transducers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10General applications
    • H04R2499/11Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/4957Sound device making

Definitions

  • the present invention relates to an electro-acoustic communications unit and a portable electronic device including an electro-acoustic communications unit.
  • a portable electronic device for instance of the cellular phone type, is normally provided with electro-acoustic elements such as speakers and microphones in order to produce and receive sound.
  • a speaker box or back volume behind the membrane of the speaker For a speaker, there is a speaker box or back volume behind the membrane of the speaker. For a cellular phone, this volume is normally decided by air gaps provided between different components and elements of the phone. This means that the back volume cannot readily be designed for the best audio performance as in, for instance, hifi equipment.
  • the membrane can provide larger strokes/excursions for proving higher sound volumes, especially when playing music.
  • the invention is thus directed towards providing an electro-acoustic communications unit which can be used for providing larger strokes or a more stiff suspension of acoustic signal emitting elements of the electro-acoustic communications unit.
  • aspects of the invention provide an improved electro-acoustic communications unit, and especially one which can be used for providing larger strokes or a more stiff suspension of an acoustic signal emitting element of the unit.
  • an electro-acoustic communications unit for mounting in a cellular phone, comprises an acoustic driver, which when operated emits acoustic waves in two directions, and a hermetically sealed container attached to the acoustic driver and comprising a gas other than air, which gas transports acoustic waves generated by the acoustic driver.
  • a second aspect of the invention is directed towards an electro-acoustic communications unit including the features of the first aspect, wherein the hermetically sealed container has at least one flexible wall, the shape of which will be determined at least partly by elements in the interior of a portable electronic device where the unit is to be mounted.
  • a third aspect of the invention is directed towards the electro-acoustic communications unit including the features of the first aspect, wherein the acoustic driver comprises an acoustic signal generating element that is attached to the container.
  • a fourth aspect of the invention is directed towards the electro-acoustic communications unit including the features of the first aspect, wherein a part of the container is an acoustic signal generating element of the acoustic driver.
  • a fifth aspect of the invention is directed towards the electro-acoustic communications unit including the features of the first aspect, further comprising an absorbent covering the entire hermetically sealed container, except for parts connected to or being part of the acoustic driver.
  • a sixth aspect of the invention is directed towards the electro-acoustic communications unit including the features of the first aspect, wherein the gas is lighter than air.
  • a seventh aspect of the invention is directed towards the electro-acoustic communications unit including the features of the sixth aspect, wherein the gas is helium.
  • An eight aspect of the invention is directed towards the electro-acoustic communications unit including the features of the first aspect, wherein the gas is heavier than air.
  • a ninth aspect of the invention is directed towards the electro-acoustic communications unit including the features of the first aspect, wherein the container is made of rubber.
  • a portable electronic device that includes an improved electro-acoustic communications unit, and especially one which can be used for providing larger strokes or a more stiff suspension of an acoustic signal emitting element of the unit.
  • a portable electronic device that comprises an electro-acoustic communications unit.
  • the portable electronic device comprises an acoustic driver, which when operated emits acoustic waves in two directions, and a hermetically sealed container attached to the acoustic driver and comprising a gas other than air, where the gas transports acoustic waves generated by the acoustic driver.
  • An eleventh aspect of the invention is directed towards the portable communication device including the features of the tenth aspect, wherein the hermetically sealed container has at least one flexible wall, the shape of which is determined at least partly by elements in the interior of the portable electronic device.
  • a twelfth aspect of the invention is directed towards the portable communication device including the features of the tenth aspect, wherein the acoustic driver comprises an acoustic signal generating element that is attached to the container.
  • a thirteenth aspect of the invention is directed towards the portable communication device including the features of the tenth aspect, wherein a part of the container is an acoustic signal generating element of the acoustic driver.
  • a fourteenth aspect of the invention is directed towards the portable communication device including the features of the tenth aspect, further comprising an absorbent covering the entire hermetically sealed container, except for parts connected to or being part of the acoustic driver.
  • a fifteenth aspect of the invention is directed towards the portable communication device including the features of the fourteenth aspect, wherein the gas is lighter than air.
  • a sixteenth aspect of the invention is directed towards the portable communication device including the features of the fifteenth aspect, wherein the gas is helium.
  • a seventeenth aspect of the invention is directed towards the portable communication device including the features of the tenth aspect, wherein the gas is heavier than air.
  • An eighteenth aspect of the invention is directed towards the portable communication device including the features of the tenth aspect, wherein the container is made of rubber.
  • a nineteenth aspect of the invention is directed towards the portable communication device including the features of the tenth aspect, wherein the device is a portable communication device.
  • a twentieth aspect of the invention is directed towards the portable communication device including the features of the nineteenth aspect, wherein the device is a cellular phone.
  • aspects of the invention enable the provision of larger strokes or a more stiff suspension of acoustic signal emitting elements of the electro-acoustic communications unit.
  • the invention according to the second and eleventh aspects furthermore allows the unit to use the available mounting volume provided in a portable electronic device in an effective way.
  • the absorbent according to the fifth and fourteenth aspects furthermore allows the volume occupied by the unit to be better defined and thus the strokes of the acoustic driver may be better controlled as compared to using no absorbent.
  • FIG. 1 shows a front-view of a portable electronic device according to the present invention
  • FIG. 2 shows a side-view of the phone in FIG. 1 and comprising an electro-acoustic communications unit according to a first embodiment of the present invention
  • FIG. 3 schematically shows the electro-acoustic communications unit according to the first embodiment of the present invention
  • FIG. 4 schematically shows the electro-acoustic communications unit according to a second embodiment of the present invention.
  • FIG. 5 schematically shows the electro-acoustic communications unit according to a third embodiment of the present invention.
  • the present invention relates to an electro-acoustic communications unit and a portable electronic device including such an electro-acoustic communications unit.
  • FIG. 1 shows a front view of a portable electronic device in the form of a cellular phone 10 .
  • the phone 10 has a casing 12 where a keypad 14 , a display 16 and a sound opening 18 is provided. Beneath the opening 18 within the casing 12 , an electro-acoustic communications unit according to the invention is provided.
  • the portable electronic device 10 is, according to a preferred variation of the present invention, a cellular phone. It should however be realized that the present invention is not limited to cellular phones, but may be provided in other portable communication devices and portable electronic devices like lap top computers, palm top computers, organizers, cordless phones or gaming machines.
  • FIG. 2 shows a cross-sectional side view of the phone of FIG. 1 . It should here be noted that many elements of the phone 10 have been omitted in order to concentrate on the teachings of the present invention.
  • FIG. 2 there is shown the keypad 14 on the casing 12 of the phone 10 and the display 16 just underneath it (shown as a dashed box). Above the display 16 , the sound opening 18 is provided. Just underneath this opening 18 , there is provided an electro-acoustic communications unit 20 according to the invention. This unit is referred to herein as a speakerbox package. There is here also a circuit board 21 provided underneath the electro-acoustic communications unit 20 , the keypad 14 and the display 16 , but within the casing 12 .
  • the electro-acoustic communications unit according to the first embodiment of the present invention is schematically shown in FIG. 3 .
  • the unit 20 is provided with an acoustic driver in the form of an ordinary electromagnetic loudspeaker 22 , the back side of which is directly attached to a hermetically sealed container 24 having an elastic, deformable and flexible wall. The container may therefore be stretched and deformed.
  • the speaker 22 has an acoustic signal generating element in the form of a membrane 23 (shown as a dashed ellipse).
  • the container is made of an elastic material, such as rubber, and is non-permeable for gas.
  • One side of the membrane 23 of the speaker 22 is here directly attached to this rubber container 24 , while the other side faces the sound opening of the casing.
  • an enclosing volume V is indicated with a dashed box.
  • the enclosing volume V is in reality made up of the elements of the phone that surround the electro-acoustic communications unit 20 , like parts of the casing, the circuit board, components on the circuit board, the display, an antenna, an antenna connector, etc.
  • the container 24 furthermore contains a gas P 1 which is different than the gas P 2 surrounding the container.
  • the surrounding gas P 2 is here air. Because of the non-permeable nature of the container wall, the gas P 1 cannot escape from the container 24 .
  • the elastic wall adapts to the volume V.
  • the shape of the wall is thus determined by this volume V.
  • the container 24 thus adapts in shape to the surrounding area where it is mounted in order to as effectively as possible provide a back volume for the speaker 22 .
  • the gas P 1 of the speaker may be lighter than air, preferably helium.
  • the membrane of the speaker emits sound into the air from the front side.
  • the back side emits sound into the helium filled back volume defined by the container 24 .
  • This gas that is “softer” and less dense than air, gives a good balance to the speaker and also ensures larger strokes for the membrane 23 , and thus the possibility of providing a higher sound volume.
  • the gas P 1 may be also be heavier than air P 2 .
  • the gas P 1 provides a stiffer suspension of the speaker element, which lowers distortion that occurs at the resonance frequency of the speaker 22 . It also balances the speaker better so that rocking mode distortion phenomena are less likely to occur.
  • FIG. 4 there is schematically shown a second embodiment of the electro-acoustic communications unit 20 according to the invention.
  • the container 24 is connected to the front side of the speaker 22 .
  • the speaker is supposed to have its back side facing outwards towards the casing and its front side facing inwards into the phone.
  • a speaker operates equally well on both sides.
  • the container wall is furthermore also a part of the membrane of the speaker, which means that a part of the container wall actually is a membrane of the speaker. This has the advantage of allowing a simpler manufacturing of the electro-acoustic communications unit 20 because the speaker membrane 23 and the container 24 may be provided in one piece of the same material.
  • FIG. 5 schematically shows a third embodiment of the electro-acoustic communications unit 20 according to the present invention.
  • an absorbent 26 which may be a porous fiber material, such as, for example, Rockwool, which acoustically acts as a spring.
  • the material 26 may cover the entire container 24 except for the parts connected to the speaker 22 . This material holds the container 24 in the place that has been reserved for it.
  • the absorbent 26 also allows the back volume to be better defined and thus the strokes of the speaker 22 may be controlled better than without it.

Abstract

An electro-acoustic communications unit (20) may include an acoustic driver (22) which, when operated, emits acoustic waves in two directions. A hermetically sealed container (24) attached to the acoustic driver may include a gas other than air. The gas may transport acoustic waves generated by the acoustic driver.

Description

    RELATED APPLICATIONS
  • This application is a continuation of U.S. patent application Ser. No. 11/399,518, filed Apr. 7, 2006, which claims priority under 35 U.S.C. §119 based on U.S. Provisional Application Ser. No. 60/740,655, filed Nov. 30, 2005, the disclosures of both of which are incorporated herein by reference.
  • TECHNICAL FIELD OF THE INVENTION
  • The present invention relates to an electro-acoustic communications unit and a portable electronic device including an electro-acoustic communications unit.
  • DESCRIPTION OF RELATED ART
  • A portable electronic device, for instance of the cellular phone type, is normally provided with electro-acoustic elements such as speakers and microphones in order to produce and receive sound.
  • For a speaker, there is a speaker box or back volume behind the membrane of the speaker. For a cellular phone, this volume is normally decided by air gaps provided between different components and elements of the phone. This means that the back volume cannot readily be designed for the best audio performance as in, for instance, hifi equipment.
  • In the field of hifi equipment, there have been investigations concerning the use of helium instead of air in such a back volume. The reason that this is done is to avoid resonance caused by the speaker box.
  • However, it may for some applications be desirable to have a speaker, where the membrane can provide larger strokes/excursions for proving higher sound volumes, especially when playing music. For some applications it may be desirable to provide a more stiff suspension of the speaker element in the phone. This may be desirable if distortion problems are to be avoided as the loudspeaker membrane and suspension would be better balanced, thus lowering the chance for rocking mode distortion phenomenon.
  • There is thus a need for providing an improved electro-acoustic communications unit that solves at least some of the above mentioned problems.
  • SUMMARY OF THE INVENTION
  • The invention is thus directed towards providing an electro-acoustic communications unit which can be used for providing larger strokes or a more stiff suspension of acoustic signal emitting elements of the electro-acoustic communications unit.
  • This may be achieved through using an acoustic driver, which when operated emits acoustic waves in two directions, to which a hermetically sealed container comprising a gas is attached, where the gas transports acoustic waves generated by the acoustic driver.
  • Aspects of the invention provide an improved electro-acoustic communications unit, and especially one which can be used for providing larger strokes or a more stiff suspension of an acoustic signal emitting element of the unit.
  • According to a first aspect of the invention, an electro-acoustic communications unit for mounting in a cellular phone, comprises an acoustic driver, which when operated emits acoustic waves in two directions, and a hermetically sealed container attached to the acoustic driver and comprising a gas other than air, which gas transports acoustic waves generated by the acoustic driver.
  • A second aspect of the invention is directed towards an electro-acoustic communications unit including the features of the first aspect, wherein the hermetically sealed container has at least one flexible wall, the shape of which will be determined at least partly by elements in the interior of a portable electronic device where the unit is to be mounted.
  • A third aspect of the invention is directed towards the electro-acoustic communications unit including the features of the first aspect, wherein the acoustic driver comprises an acoustic signal generating element that is attached to the container.
  • A fourth aspect of the invention is directed towards the electro-acoustic communications unit including the features of the first aspect, wherein a part of the container is an acoustic signal generating element of the acoustic driver.
  • A fifth aspect of the invention is directed towards the electro-acoustic communications unit including the features of the first aspect, further comprising an absorbent covering the entire hermetically sealed container, except for parts connected to or being part of the acoustic driver.
  • A sixth aspect of the invention is directed towards the electro-acoustic communications unit including the features of the first aspect, wherein the gas is lighter than air.
  • A seventh aspect of the invention is directed towards the electro-acoustic communications unit including the features of the sixth aspect, wherein the gas is helium.
  • An eight aspect of the invention is directed towards the electro-acoustic communications unit including the features of the first aspect, wherein the gas is heavier than air.
  • A ninth aspect of the invention is directed towards the electro-acoustic communications unit including the features of the first aspect, wherein the container is made of rubber.
  • Other aspects of the invention provide a portable electronic device that includes an improved electro-acoustic communications unit, and especially one which can be used for providing larger strokes or a more stiff suspension of an acoustic signal emitting element of the unit.
  • According to a tenth aspect of the invention, a portable electronic device that comprises an electro-acoustic communications unit is provided. The portable electronic device comprises an acoustic driver, which when operated emits acoustic waves in two directions, and a hermetically sealed container attached to the acoustic driver and comprising a gas other than air, where the gas transports acoustic waves generated by the acoustic driver.
  • An eleventh aspect of the invention is directed towards the portable communication device including the features of the tenth aspect, wherein the hermetically sealed container has at least one flexible wall, the shape of which is determined at least partly by elements in the interior of the portable electronic device.
  • A twelfth aspect of the invention is directed towards the portable communication device including the features of the tenth aspect, wherein the acoustic driver comprises an acoustic signal generating element that is attached to the container.
  • A thirteenth aspect of the invention is directed towards the portable communication device including the features of the tenth aspect, wherein a part of the container is an acoustic signal generating element of the acoustic driver.
  • A fourteenth aspect of the invention is directed towards the portable communication device including the features of the tenth aspect, further comprising an absorbent covering the entire hermetically sealed container, except for parts connected to or being part of the acoustic driver.
  • A fifteenth aspect of the invention is directed towards the portable communication device including the features of the fourteenth aspect, wherein the gas is lighter than air.
  • A sixteenth aspect of the invention is directed towards the portable communication device including the features of the fifteenth aspect, wherein the gas is helium.
  • A seventeenth aspect of the invention is directed towards the portable communication device including the features of the tenth aspect, wherein the gas is heavier than air.
  • An eighteenth aspect of the invention is directed towards the portable communication device including the features of the tenth aspect, wherein the container is made of rubber.
  • A nineteenth aspect of the invention is directed towards the portable communication device including the features of the tenth aspect, wherein the device is a portable communication device.
  • A twentieth aspect of the invention is directed towards the portable communication device including the features of the nineteenth aspect, wherein the device is a cellular phone.
  • The present invention has a number of advantages. For example, aspects of the invention enable the provision of larger strokes or a more stiff suspension of acoustic signal emitting elements of the electro-acoustic communications unit. The invention according to the second and eleventh aspects furthermore allows the unit to use the available mounting volume provided in a portable electronic device in an effective way. The absorbent according to the fifth and fourteenth aspects furthermore allows the volume occupied by the unit to be better defined and thus the strokes of the acoustic driver may be better controlled as compared to using no absorbent.
  • It should be emphasized that the term “comprises/comprising” when used in this specification is taken to specify the presence of stated features, integers, steps or components, but does not preclude the presence or addition of one or more other features, integers, steps components or groups thereof.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The present invention will be more clearly understood from the following description of the present invention, read in conjunction with the attached drawings, where
  • FIG. 1 shows a front-view of a portable electronic device according to the present invention,
  • FIG. 2 shows a side-view of the phone in FIG. 1 and comprising an electro-acoustic communications unit according to a first embodiment of the present invention,
  • FIG. 3 schematically shows the electro-acoustic communications unit according to the first embodiment of the present invention,
  • FIG. 4 schematically shows the electro-acoustic communications unit according to a second embodiment of the present invention, and
  • FIG. 5 schematically shows the electro-acoustic communications unit according to a third embodiment of the present invention.
  • DETAILED DESCRIPTION OF THE EMBODIMENTS
  • The present invention relates to an electro-acoustic communications unit and a portable electronic device including such an electro-acoustic communications unit.
  • FIG. 1 shows a front view of a portable electronic device in the form of a cellular phone 10. The phone 10 has a casing 12 where a keypad 14, a display 16 and a sound opening 18 is provided. Beneath the opening 18 within the casing 12, an electro-acoustic communications unit according to the invention is provided. The portable electronic device 10 is, according to a preferred variation of the present invention, a cellular phone. It should however be realized that the present invention is not limited to cellular phones, but may be provided in other portable communication devices and portable electronic devices like lap top computers, palm top computers, organizers, cordless phones or gaming machines.
  • FIG. 2 shows a cross-sectional side view of the phone of FIG. 1. It should here be noted that many elements of the phone 10 have been omitted in order to concentrate on the teachings of the present invention.
  • In FIG. 2 there is shown the keypad 14 on the casing 12 of the phone 10 and the display 16 just underneath it (shown as a dashed box). Above the display 16, the sound opening 18 is provided. Just underneath this opening 18, there is provided an electro-acoustic communications unit 20 according to the invention. This unit is referred to herein as a speakerbox package. There is here also a circuit board 21 provided underneath the electro-acoustic communications unit 20, the keypad 14 and the display 16, but within the casing 12.
  • The electro-acoustic communications unit according to the first embodiment of the present invention is schematically shown in FIG. 3. The unit 20 is provided with an acoustic driver in the form of an ordinary electromagnetic loudspeaker 22, the back side of which is directly attached to a hermetically sealed container 24 having an elastic, deformable and flexible wall. The container may therefore be stretched and deformed. The speaker 22 has an acoustic signal generating element in the form of a membrane 23 (shown as a dashed ellipse). The container is made of an elastic material, such as rubber, and is non-permeable for gas. One side of the membrane 23 of the speaker 22 is here directly attached to this rubber container 24, while the other side faces the sound opening of the casing. For illustrative purposes, an enclosing volume V is indicated with a dashed box. The enclosing volume V is in reality made up of the elements of the phone that surround the electro-acoustic communications unit 20, like parts of the casing, the circuit board, components on the circuit board, the display, an antenna, an antenna connector, etc.
  • The container 24 furthermore contains a gas P1 which is different than the gas P2 surrounding the container. The surrounding gas P2 is here air. Because of the non-permeable nature of the container wall, the gas P1 cannot escape from the container 24.
  • When the electro-acoustic communications unit 20 according to this first embodiment is mounted into the phone, the elastic wall adapts to the volume V. The shape of the wall is thus determined by this volume V. The container 24 thus adapts in shape to the surrounding area where it is mounted in order to as effectively as possible provide a back volume for the speaker 22.
  • The gas P1 of the speaker may be lighter than air, preferably helium. When the speaker 22 is operated, the membrane of the speaker emits sound into the air from the front side. However, the back side emits sound into the helium filled back volume defined by the container 24. This gas, that is “softer” and less dense than air, gives a good balance to the speaker and also ensures larger strokes for the membrane 23, and thus the possibility of providing a higher sound volume.
  • The gas P1 may be also be heavier than air P2. In this case, the gas P1 provides a stiffer suspension of the speaker element, which lowers distortion that occurs at the resonance frequency of the speaker 22. It also balances the speaker better so that rocking mode distortion phenomena are less likely to occur.
  • In FIG. 4, there is schematically shown a second embodiment of the electro-acoustic communications unit 20 according to the invention. Here the container 24 is connected to the front side of the speaker 22. In this embodiment the speaker is supposed to have its back side facing outwards towards the casing and its front side facing inwards into the phone. As is well known within the field, a speaker operates equally well on both sides. In this embodiment the container wall is furthermore also a part of the membrane of the speaker, which means that a part of the container wall actually is a membrane of the speaker. This has the advantage of allowing a simpler manufacturing of the electro-acoustic communications unit 20 because the speaker membrane 23 and the container 24 may be provided in one piece of the same material.
  • FIG. 5 schematically shows a third embodiment of the electro-acoustic communications unit 20 according to the present invention. In this embodiment, which has the same relationship between speaker 22 and container 24 as the first embodiment, there is furthermore provided an absorbent 26, which may be a porous fiber material, such as, for example, Rockwool, which acoustically acts as a spring. The material 26 may cover the entire container 24 except for the parts connected to the speaker 22. This material holds the container 24 in the place that has been reserved for it. The absorbent 26 also allows the back volume to be better defined and thus the strokes of the speaker 22 may be controlled better than without it.
  • It is emphasized that this invention can be varied in many more ways, than the ones described above. It is for instance possible to equip the container with more walls and also provide these walls as rigid walls. The container need not be made of rubber but can be made of a suitable plastic material instead. Hence the present invention is only to be limited by the following claims.

Claims (20)

1. A method comprising:
forming a hermetically sealed, flexible container comprising a gas, other than air;
attaching a first side of a membrane, of a speaker, to the hermetically sealed, flexible container; and
positioning the first side of the membrane adjacent to an opening, formed in a casing of a portable electronic device, where positioning the first side of the membrane adjacent to the opening causes the hermetically sealed, flexible container to comprise a shape that is at least partially determined by elements of the portable electronic device that are positioned within the casing, and
where the shape enables the hermitically sealed, flexible container to provide a back volume for the speaker.
2. The method of claim 1, where, when forming the hermetically sealed, flexible container, the method further comprises:
substantially covering, except for portions connected to the speaker, the hermetically sealed, flexible container with an absorbent.
3. The method of claim 2, further comprising:
retaining, by the absorbent, the hermetically sealed, flexible container in a position adjacent to the opening.
4. The method of claim 1, where forming the hermetically sealed, flexible container further comprises:
forming the membrane to be integral with the hermetically sealed, flexible container.
5. The method of claim 1, where the gas other than air comprises a density that is greater than a density of air.
6. The method of claim 1, where the gas other than air comprises a density that is less than a density of air.
7. The method of claim 1, where the gas other than air comprises helium.
8. A communications unit for mounting in a portable electronic device, the communications unit comprising:
a hermetically sealed, flexible container directly attached to an acoustic driver and comprising a gas, other than air, to transport acoustic waves, generated during operation of the acoustic driver, in a first direction to modify the operation of the acoustic driver.
9. The communications unit of claim 8, where the hermetically sealed, flexible container comprises:
a container wall, integral to the hermetically sealed, flexible container, that comprises at least a portion of the acoustic driver.
10. The communications unit of claim 8, further comprising:
an absorbent to acoustically act as a spring, where the absorbent substantially covers the hermetically sealed, flexible container.
11. The communications unit of claim 10, where the absorbent comprises a porous fiber material.
12. The communications unit of claim 8, where the gas other than air comprises a density that is greater than a density of air.
13. The communications unit of claim 8, where the gas other than air comprises a density that is less than a density of air.
14. A communications unit for mounting in a portable electronic device, the communications unit comprising:
a hermetically sealed, flexible container, directly attached to an acoustic driver that emits waves in two directions, the hermetically sealed, flexible container comprising:
a gas, other than air, that transports acoustic waves generated by the acoustic driver, where the acoustic driver comprises a membrane, where the hermetically sealed container attaches directly to the membrane.
15. The communications unit of claim 14, where the hermetically sealed, flexible container comprises:
a container wall, integral to the hermetically sealed, flexible container, that comprises at least a portion of the acoustic driver.
16. The communications unit of claim 14, further comprising:
an absorbent to acoustically act as a spring, where the absorbent substantially covers the hermetically sealed, flexible container.
17. The communications unit of claim 16, where the absorbent comprises a porous fiber material.
18. The communications unit of claim 14, where the gas other than air comprises a density that is greater than a density of air.
19. The communications unit of claim 14, where the gas other than air comprises a density that is less than a density of air.
20. The communications unit of claim 14, where the gas other than air comprises helium.
US13/040,596 2005-11-30 2011-03-04 Speakerbox Abandoned US20110158448A1 (en)

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US11/399,518 US7925035B2 (en) 2005-11-30 2006-04-07 Speakerbox
US13/040,596 US20110158448A1 (en) 2005-11-30 2011-03-04 Speakerbox

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CN (1) CN101317498B (en)
AT (1) ATE491311T1 (en)
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WO (1) WO2007062937A1 (en)

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US7925035B2 (en) 2011-04-12
EP1955573B1 (en) 2010-12-08
ATE491311T1 (en) 2010-12-15
DE602006018783D1 (en) 2011-01-20
US20070123313A1 (en) 2007-05-31
CN101317498B (en) 2012-04-18
WO2007062937A1 (en) 2007-06-07
EP1955573A1 (en) 2008-08-13
CN101317498A (en) 2008-12-03

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