EP2369855B1 - Elektronische Vorrichtung mit elektroakustischem Elektretwandler - Google Patents

Elektronische Vorrichtung mit elektroakustischem Elektretwandler Download PDF

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Publication number
EP2369855B1
EP2369855B1 EP11162045.6A EP11162045A EP2369855B1 EP 2369855 B1 EP2369855 B1 EP 2369855B1 EP 11162045 A EP11162045 A EP 11162045A EP 2369855 B1 EP2369855 B1 EP 2369855B1
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EP
European Patent Office
Prior art keywords
electronic device
electro
acoustic transducer
electret
electret diaphragm
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.)
Not-in-force
Application number
EP11162045.6A
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English (en)
French (fr)
Other versions
EP2369855A3 (de
EP2369855A2 (de
Inventor
Yi Tsung Cheng
Fang Ching Lee
Chih Chao Hsieh
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.)
HTC Corp
Original Assignee
HTC Corp
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Filing date
Publication date
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Publication of EP2369855A2 publication Critical patent/EP2369855A2/de
Publication of EP2369855A3 publication Critical patent/EP2369855A3/de
Application granted granted Critical
Publication of EP2369855B1 publication Critical patent/EP2369855B1/de
Not-in-force legal-status Critical Current
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/01—Electrostatic transducers characterised by the use of electrets
    • H04R19/013—Electrostatic transducers characterised by the use of electrets for loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's

Definitions

  • the invention relates to a portable electronic device with an electro-acoustic transducer, and more particularly, to a portable electronic device with an electret electro-acoustic transducer.
  • Loudspeakers are a kind of device to make sound.
  • the principle of making sound for the loudspeakers is to move the diaphragms thereof by electrical signals to push the air.
  • the loudspeakers have been broadly used in electronic devices with the function of making sound, such as mobile phones, personal digital assistants (PDAs) and laptop computers.
  • One of the common loudspeakers is so-called dynamic loudspeaker.
  • the principle of making sound for the dynamic loudspeaker is to drive a current through the voice coil to produce a magnet field. This magnetic field causes the voice coil to react to the magnetic field from a permanent magnet fixed to the frame of the loudspeaker thereby moving the diaphragm attached with the voice coil.
  • the loudspeaker has a considerable thickness because its sound chamber is large.
  • EP 1722 596 A1 discloses an electret condenser microphone includes: a substrate in which an opening is formed; an electret condenser connected to one face of the substrate so as to close the opening and having an acoustic hole and a cavity; a drive circuit element connected to the one face of the substrate; and a case mounted over the substrate so as to cover the electret condenser and the drive circuit element .
  • Electric contact is established at a joint part between the electret condenser and the substrate.
  • the acoustic hole communicates with an external space through the opening.
  • the cavity and an internal region of the case serve as a back air chamber for the electret condenser.
  • US 20041170291 is directed to a mobile device with improved acoustic porting.
  • the mobile device includes a housing that has at least one sound hole, a transducer for converting an electrical signal into an acoustical signal, and a grommet that engages the housing and the transducer to form an interior cavity.
  • a passage acoustically couples the interior cavity with the interior of the housing.
  • the transducer emits sound into the interior cavity. The sound travels from the interior cavity through the passage into the interior of the housing and then to the user's ear via the sound hole(s) in the housing.
  • the passage may be any channel, tube, passageway, or pathway that allows an acoustical signal to travel from the interior cavity to the interior of the housing.;
  • the transducer may also emit sound into the interior of the housing that mixes with the sound traveling from the interior cavity through the passage into the interior of the housing.
  • the portable electronic device of the invention comprises the features of claim 1.
  • the portable electret electro-acoustic transducer of the portable electronic devices has a greatly smaller thickness than the traditional dynamic loudspeakers, and, therefore, the available space inside the electronic device can be increased.
  • the electronic device 100 with an electro-acoustic transducer includes a housing 110 having a plurality of openings 114 penetrating between the inner surface 112 and the outer surface 118 thereof.
  • An electro-acoustic transducer 180 is disposed on the inner surface 112 of the housing 110.
  • the electro-acoustic transducer 180 includes an electret diaphragm 120 positioned on the inner surface 112 of the housing 110.
  • the electret diaphragm 120 includes a film body 122 and an electrode layer 124 formed on the lower surface of the film body 122.
  • the film body 122 is made of dielectric material and has static charges.
  • the film body 122 has a thickness of 7 to 25 ⁇ m and the electrode layer 124 has a thickness of 0.05 to 1 ⁇ m.
  • a conductive plate 140 functioning as an electrode is stacked on the upper surface of the film body 122 and has a plurality of openings 142 corresponding to the openings 114.
  • the conductive plate 140 has a thickness of 0.1 to 1 mm, and an aperture ratio of the openings 142 on the conductive plate 140 is greater than 20%.
  • at least one spacer 150 is disposed between the electret diaphragm 120 and the conductive plate 140 to keep a predetermined distance between the electret diaphragm 120 and the conductive plate 140.
  • the spacer 150 is spaced 5 to 20 mm apart from each other and has a height of 100 to 400 ⁇ m.
  • the film body 122 originally without static charges carried thereon is required to be subjected to a polarizing process.
  • a corona charging process can be used to polarize the film body 122 to generate static charges therein and thereon after the electrode layer 124 is formed on the film body 122.
  • the material suitable for the film body 122 can be fluorinated ethylene propylene (FEP), Polytetrafluoroethene (PTFE), Polyvinylidene Fluoride (PVDF), silicon dioxide (SiO2) or other fluoride polymers.
  • FEP fluorinated ethylene propylene
  • PTFE Polytetrafluoroethene
  • PVDF Polyvinylidene Fluoride
  • SiO2 silicon dioxide
  • the edge of the electret diaphragm 120 is required to be fixed to prevent the electret diaphragm 120 from movement.
  • electro-acoustic transducer 180 of the present embodiment work, electrical signals having the same phase and opposite phase with the original sound signal, i.e. differential signals have to be applied to the conductive plate 140 and electrode layer 124, respectively so that the electret diaphragm 120 is subject to the Coulomb forces from the conductive plate 140 and electrode layer 124 to bring about a push-pull effect.
  • the push-pull effect will cause the electret diaphragm 120 to vibrate in accordance with the electrical signals.
  • the vibration of the electret diaphragm 120 pushes the air to make sounds.
  • the sounds can travel through the openings 114 to the outside of the housing 110 thereby a user can hear the sounds.
  • the upper surface of the conductive plate 140 is spaced a predetermined distance, said more that 1 mm apart from the elements above the conductive plate 140 to prevent the echo from degrading the performance of the electro-acoustic transducer 180.
  • a sound absorbing layer 160 made of, such as glass fiber, sponge or non-woven can be attached to the upper surface of the conductive plate 140 to absorb the sounds traveling through the openings 142.
  • the sound absorbing layer 160 has a thickness of 1 to 5 mm.
  • At least one spacer 170 with a thickness of 30 to 50 ⁇ m and corresponding to the spacer 150 is positioned between the electrode layer 124 and the inner surface 112 of the housing 110 to keep the electrode layer 124 from contact with the housing 110.
  • the spacer 150 can be made of adhesive material, such as double-sided tape to attach the conductive plate 140 and film body 122 together.
  • the electronic device 200 with an electro-acoustic transducer has all the elements of the electronic device 100, that is, the housing 110 and the electret diaphragm 120, conductive plate 140, spacers 150, 170 and sound absorbing layer 160 of the electro-acoustic transducer 180.
  • the electro-acoustic transducer 280 of the electronic device 200 further includes a conductive plate 240 functioning as an electrode that is stacked on the conductive plate 140 and has a plurality of openings 242 corresponding to the openings 142 of the conductive plate 140.
  • the conductive plate 240 has a thickness of 0.1 to 1 mm.
  • An isolation layer 290 made of porous air-permeable membrane has a thickness of 20 to 200 ⁇ m and is disposed between the conductive plates 140 and 240.
  • an electret diaphragm 220 is positioned on the conductive plate 240 and includes a film body 222 and an electrode layer 224 formed on the upper surface of the film body 222, wherein the sound absorbing layer 160 is attached to the electrode layer 224.
  • the film body 222 is made of dielectric material and has static charges.
  • the film body 222 has a thickness of 7 to 25 ⁇ m and the electrode layer 224 has a thickness of 0.05 to 1 ⁇ m.
  • At least one spacer 250 made of, such as adhesive material and corresponding to the spacer 150 is disposed between the electret diaphragm 220 and the conductive plate 240 to keep a predetermined distance between the electret diaphragm 220 and the conductive plate 240.
  • the spacer 250 has a height of 100 to 400 ⁇ m.
  • the film body 222 originally without static charges carried thereon is also required to be polarized in order to generate static charges therein and thereon.
  • the material suitable for the film body 222 can be FEP, PTFE, PVDF, silicon dioxide or other fluoride polymers.
  • the edge of the electret diaphragm 220 is also required to be fixed to prevent the electret diaphragm 220 from movement.
  • a first electrical signal having the same phase with the original sound signal have to be applied to the conductive plate 140 and the electrode layer 224 and a second electrical signal having opposite phase with the original sound signal is applied to the electrode layer 124 and the conductive plate 240.
  • the electret diaphragms 120 and 220 will be subject to the Coulomb forces from the conductive plates 140, 240 and electrode layers 124, 224 to vibrate and make sounds in accordance with the first and second electrical signals.
  • the sounds made by the electret diaphragm 220 can travel through the isolation layer 290 and openings 114 to the outside of the housing 110.
  • the electro-acoustic transducer 280 with double electret diaphragms can make double (3dB) sounds than the electro-acoustic transducer 180 with only a single electret diaphragm.
  • the electronic device 300 with an electro-acoustic transducer includes a housing 110 and an electro-acoustic transducer 380 disposed on the inner surface 112 of the housing 110.
  • the electro-acoustic transducer 380 includes a conductive plate 340 functioning as an electrode disposed on the inner surface 112 of the housing 110.
  • the conductive plate 340 has a plurality of openings 342 corresponding to the openings 114.
  • An electret diaphragm 320 is stacked on the conductive plate 340 and includes a film body 322 and an electrode layer 324 formed on the upper surface of the film body 322.
  • the film body 322 is made of dielectric material and has static charges.
  • the film body 322 has a thickness of 7 to 25 ⁇ m and the electrode layer 324 has a thickness of 0.05 to 1 ⁇ m
  • at least one spacer 350 made of, such as adhesive material is disposed between the electret diaphragm 320 and the conductive plate 340 to keep a predetermined distance between the electret diaphragm 320 and the conductive plate 340.
  • the spacer 350 is spaced 5 to 20 mm apart from each other and has a height of 100 to 400 ⁇ m.
  • at least one spacer 370 made of, such as adhesive material and corresponding to the spacer 350 is positioned between the conductive plate 340 and the inner surface 112 of the housing 110 to keep the conductive plate 340 from contact with the housing 110.
  • the spacer 370 has a thickness of 30 to 50 ⁇ m.
  • a sound absorbing layer 360 is attached to the electrode layer 324 to prevent the echo from degrading the performance of the electro-acoustic transducer 380.
  • the film body 322 originally without static charges carried thereon is also required to be polarized in order to generate static charges therein and thereon.
  • the material suitable for the film body 322 can be FEP, PTFE, PVDF, silicon dioxide or other fluoride polymers.
  • the edge of the electret diaphragm 320 is also required to be fixed to prevent the electret diaphragm 320 from movement.
  • an electrical signal has to be applied to the conductive plate 340 and electrode layer 324 thereby the electret diaphragm 320 can vibrate to make sounds in accordance with the electrical signal.
  • the electronic device 400 with an electro-acoustic transducer is substantially the same as the electronic device 300 of FIG. 4 , where identical reference numerals have been used when designating substantially identically elements that are common to the figures. Any further illustrations of the identical elements are omitted herein. The difference between them is in that the electro-acoustic transducer 480 of the electronic device 400 includes a conductive layer 440 coated on the inner surface 112 of the housing 110 to replace the conductive plate 340 and does not have the spacer 370.
  • an electrical signal has to be applied to the conductive layer 440 and electrode layer 324 thereby the electret diaphragm 320 can vibrate to make sounds in accordance with the electrical signal.
  • the electro-acoustic transducers 180, 280, 380 and 480 of the electronic devices 100, 200, 300 and 400 are disposed on the housing 110 and the housing 110 can be a front cover, side cover or back cover of the electronic devices 100, 200, 300 and 400. It will be appreciated that the electro-acoustic transducers 180, 280, 380 and 480 have to be electrically connected to other elements, such as circuit boards in the electronic devices 100, 200, 300 and 400 in order to work. Referring back to FIGS.
  • the electrical terminals 119a and 119b disposed on the inner surface 112 of the back cover 110 of the electronic device 200 are electrically connected to the conductive plate 240 and electrode layer 224 of the electro-acoustic transducer 280, respectively.
  • the electrical terminals 116a and 116b are respectively brought into electrical contact with the electrical terminals 197a and 197b on the circuit boards 195 of the electronic devices 100, 200, 300 and 400, and the electrical terminals 119a and 119b (shown in FIG.
  • the electrical signals can be applied to the conductive plates 140, 240, 340, conductive layer 440 and electrode layers 124, 224, 324 thereby the electret diaphragms 120, 220, 320 can vibrate to make sounds in accordance with the electrical signals.
  • the spacers of the electro-acoustic transducers can be discrete spacers.
  • the above discrete spacers can be replaced with the sheets formed with a plurality of openings thereon.
  • the electronic devices of the present invention can be portable electronic devices, such as mobile phones, personal digital assistants (PDAs) or laptop computers. Since the electro-acoustic transducers of the electronic devices according to the present invention have a greatly smaller thickness than the traditional dynamic loudspeakers, the available space inside the electronic device can be increased. In addition, the electro-acoustic transducers of the electronic devices according to the present invention can be mounted on the back covers. Therefore, the thickness of the electronic devices can be further reduced and the available space inside the electronic device can also be further increased.
  • the electret surfaces of the electret diaphragms of the electro-acoustic transducers according to the first and second embodiments of the present invention face the insides of the electronic devices, the electret surfaces therefore get rid of the contamination of the dust and moisture to avoid the malfunction of the electret diaphragms.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Telephone Set Structure (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Claims (4)

  1. Tragbare elektronische Vorrichtung, die ein Mobiltelefon, ein persönlicher digitaler Assistent (PDA) oder ein Laptop-Computer ist, umfassend:
    ein Gehäuse (110) mit einer Innenfläche (112), einer Außenfläche (118) und einer Vielzahl von Öffnungen (114), die zwischen der Innenfläche (112) und der Außenfläche (118) davon durchdringend angeordnet sind;
    eine Schaltungsplatine (195); und
    ein elektroakustischer Wandler (480), der auf der Innenfläche (112) des Gehäuses (110) angeordnet ist und elektrisch mit der Schaltungsplatine (195) verbunden ist, umfassend:
    eine leitfähige Schicht (440), die auf der Innenfläche (112) des Gehäuses (110) aufgeschichtet ist;
    eine Elektretmembran (320), die geeignet ist, einen Schall entsprechend einem elektrischen Signal zu erzeugen, wobei die Elektretmembran (320) auf der leitfähigen Schicht (440) aufgebracht ist und einen Filmkörper (322) und eine Elektrodenschicht (324) aufweist, wobei der Filmkörper (322) statische Ladungen trägt und die Elektrodenschicht (324) auf dem Filmkörper (322) ausgebildet ist; und
    wenigstens ein Abstandsstück (350), das zwischen der Elektretmembran (320) und der leitfähigen Schicht (440) angeordnet ist, um einen vorgegebenen Abstand zwischen der Elektretmembran (320) und der leitfähigen Schicht (440) beizubehalten;
    wobei die Vorrichtung ferner umfasst:
    einen ersten elektrischen Anschluss (116a) und einen zweiten elektrischen Anschluss (116b), die auf der Innenfläche (112) des Gehäuses (110) angeordnet sind, um das elektrische Signal an die Elektrodenschicht (324) der Elektretmembran (320) und die leitfähige Schicht (440) respektive elektrisch anzuschließen;
    einen dritten elektrischen Anschluss (197a) und einen vierten elektrischen Anschluss (197b) auf der Schaltungsplatine (195), wobei der erst elektrische Anschluss (116a) und der zweite elektrische Anschluss (116b) respektive elektrisch mit dem dritten elektrischen Anschluss (197a) und dem vierten elektrischen Anschluss (197b) gekoppelt ist, wobei das elektrische Signal an die Elektrodenschicht (324) der Elektretmembran (320) und die leitfähige Schicht (440) angelegt wird.
  2. Tragbare elektronische Vorrichtung nach Anspruch 1, worin der elektroakustische Wandler (480) ferner eine schallabsorbierende Schicht (360) aufweist, die an der Elektrodenschicht (324) der Elektretmembran (320) befestigt ist.
  3. Tragbare elektronische Vorrichtung nach Anspruch 1, worin das wenigstens ein Abstandsteil (350) aus einem Klebematerial hergestellt ist.
  4. Tragbare elektronische Vorrichtung nach Anspruch 1, worin die Elektrodenschicht (324) der Elektretmembran (320) und die leitfähige Schicht (440) elektrisch mit dem elektrischen Signal verbunden sind.
EP11162045.6A 2008-10-31 2009-09-02 Elektronische Vorrichtung mit elektroakustischem Elektretwandler Not-in-force EP2369855B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW097141921A TWI454156B (zh) 2008-10-31 2008-10-31 具有駐電式電聲致動器之電子裝置
EP09169282.2A EP2182737B1 (de) 2008-10-31 2009-09-02 Elektronische Vorrichtung mit elektroakustischem Elektretwandler

Related Parent Applications (3)

Application Number Title Priority Date Filing Date
EP09169282.2A Division-Into EP2182737B1 (de) 2008-10-31 2009-09-02 Elektronische Vorrichtung mit elektroakustischem Elektretwandler
EP09169282.2A Division EP2182737B1 (de) 2008-10-31 2009-09-02 Elektronische Vorrichtung mit elektroakustischem Elektretwandler
EP09169282.2 Division 2009-09-02

Publications (3)

Publication Number Publication Date
EP2369855A2 EP2369855A2 (de) 2011-09-28
EP2369855A3 EP2369855A3 (de) 2012-04-04
EP2369855B1 true EP2369855B1 (de) 2014-05-07

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EP11162045.6A Not-in-force EP2369855B1 (de) 2008-10-31 2009-09-02 Elektronische Vorrichtung mit elektroakustischem Elektretwandler
EP09169282.2A Not-in-force EP2182737B1 (de) 2008-10-31 2009-09-02 Elektronische Vorrichtung mit elektroakustischem Elektretwandler

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EP (2) EP2369855B1 (de)
JP (1) JP5054749B2 (de)
TW (1) TWI454156B (de)

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US8243965B2 (en) * 2008-10-15 2012-08-14 Htc Corporation Electro-acoustic transducer
US8472650B2 (en) 2008-10-15 2013-06-25 Htc Corporation Electro-acoustic transducer
TWI439139B (zh) 2010-06-17 2014-05-21 Htc Corp 電容式電聲轉換系統及其電容式電聲轉換器
DE102013213891A1 (de) * 2013-05-21 2014-11-27 Siemens Medical Instruments Pte. Ltd. Mikrofonanordnung
WO2018213781A1 (en) * 2017-05-18 2018-11-22 The Johns Hopkins University Push-pull electret transducer with controlled restoring force for low frequency microphones and energy harvesting

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Also Published As

Publication number Publication date
JP5054749B2 (ja) 2012-10-24
EP2369855A3 (de) 2012-04-04
EP2182737A1 (de) 2010-05-05
EP2182737B1 (de) 2014-03-05
TWI454156B (zh) 2014-09-21
EP2369855A2 (de) 2011-09-28
JP2010109979A (ja) 2010-05-13
TW201018252A (en) 2010-05-01

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