WO2012049970A1 - 圧電スピーカ装置 - Google Patents
圧電スピーカ装置 Download PDFInfo
- Publication number
- WO2012049970A1 WO2012049970A1 PCT/JP2011/072198 JP2011072198W WO2012049970A1 WO 2012049970 A1 WO2012049970 A1 WO 2012049970A1 JP 2011072198 W JP2011072198 W JP 2011072198W WO 2012049970 A1 WO2012049970 A1 WO 2012049970A1
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- WIPO (PCT)
- Prior art keywords
- piezoelectric
- detection electrode
- flaw detection
- speaker device
- piezoelectric speaker
- Prior art date
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- 229920000620 organic polymer Polymers 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims description 77
- 239000010410 layer Substances 0.000 claims description 19
- 230000005856 abnormality Effects 0.000 claims description 8
- 239000011241 protective layer Substances 0.000 claims description 8
- 239000002033 PVDF binder Substances 0.000 claims description 5
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 2
- 239000004626 polylactic acid Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract 2
- 206010014357 Electric shock Diseases 0.000 description 9
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 8
- 208000027418 Wounds and injury Diseases 0.000 description 6
- -1 polyethylene terephthalate Polymers 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011787 zinc oxide Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- JVTAAEKCZFNVCJ-REOHCLBHSA-N L-lactic acid Chemical compound C[C@H](O)C(O)=O JVTAAEKCZFNVCJ-REOHCLBHSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 229910003437 indium oxide Inorganic materials 0.000 description 2
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 2
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- 239000011147 inorganic material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229920001432 poly(L-lactide) Polymers 0.000 description 2
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 229920000767 polyaniline Polymers 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 239000011112 polyethylene naphthalate Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920000123 polythiophene Polymers 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009993 protective function Effects 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
- H04R17/005—Piezoelectric transducers; Electrostrictive transducers using a piezoelectric polymer
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements 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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
- H04R2307/023—Diaphragms comprising ceramic-like materials, e.g. pure ceramic, glass, boride, nitride, carbide, mica and carbon materials
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
- H04R2307/025—Diaphragms comprising polymeric materials
Definitions
- the present invention relates to a piezoelectric speaker device, and more particularly to a piezoelectric speaker device including a piezoelectric film made of an organic polymer as a drive source.
- Patent Document 1 Japanese Patent Laid-Open No. 2003-244792
- Patent Document 1 describes a transparent piezoelectric speaker arranged in a curved shape on a display of a mobile phone.
- the piezoelectric speaker includes a flexible piezoelectric film, and transparent driving electrodes for applying a driving signal voltage are formed on both sides of the piezoelectric film, and the piezoelectric film is covered with a protective film.
- This Patent Document 1 also describes an example in which a PVDF (polyvinylidene fluoride) film is used as a piezoelectric film provided in a piezoelectric speaker.
- PVDF polyvinylidene fluoride
- the piezoelectric constant of the organic polymer such as PVDF is relatively small, and d 33 is about 40 pC / N at most. Therefore, in order to produce a practical sound pressure, it is necessary to apply a voltage of several tens to several hundreds of volts.
- an object of the present invention is to provide a piezoelectric speaker device that can solve the above-described problems.
- the present invention includes a piezoelectric film made of an organic polymer, and at least one pair of driving electrodes provided in contact with the piezoelectric film in order to apply a driving voltage for driving the piezoelectric film to the piezoelectric film.
- the present invention is directed to a piezoelectric speaker device including a speaker body.
- the drive electrode described above includes a user-side drive electrode provided on the side of the piezoelectric film that can be touched by the user's hand.
- the piezoelectric speaker device further includes an insulating layer formed on the user-side driving electrode and a flaw detection formed on the insulating layer.
- a detection circuit for detecting whether or not the flaw detection electrode line is in a normal electrical conduction state, and a drive electrode according to the detection result of the detection circuit Drive voltage control means for controlling the drive voltage applied to the capacitor.
- the speaker body further includes a protective layer formed on the insulating layer so as to cover the flaw detection electrode wire.
- the piezoelectric speaker device preferably further includes notification means for notifying the user that an abnormality has occurred in the speaker body when the detection circuit confirms damage to the flaw detection electrode wire.
- notification means include display on a display and output of a warning sound.
- the above-described flaw detection electrode wire has at least portions extending in two different directions on the insulating layer.
- the electrode line for flaw detection has a part extending in at least two different directions
- the electrode line for flaw detection has a part extending in a meander shape, or has a part extending in a spiral shape. This is the case.
- the above-described scratch detection electrode lines include a plurality of scratch detection electrode wires that are electrically independent from each other.
- the drive voltage control means described above reduces the risk of electric shock by lowering the drive voltage applied to the drive electrode when damage to the flaw detection electrode line is confirmed by the detection circuit.
- the drive voltage is lower than 42.4V, more preferably 0V.
- the driving voltage can be lowered before the driving electrode is exposed, so that the user contacts the exposed driving electrode. It is possible to prevent an electric shock accident that may occur.
- the piezoelectric film provided in the speaker body is made of an organic polymer, the driving voltage applied to the piezoelectric film via the driving electrode must be increased to several tens to several hundreds volts. Therefore, the significance of the electric shock accident prevention as described above is great.
- the protective layer not only bears a protective function for the flaw detection electrode line and the insulating layer, Since it also has a protective function for the driving electrode, the driving electrode is more difficult to be exposed and an electric shock accident is less likely to occur.
- the piezoelectric speaker device further includes notifying means for notifying the user of the occurrence of an abnormality, the user can be surely notified of the occurrence of the abnormality.
- the flaw detection electrode line has at least a portion extending in two different directions
- the flaw is detected with respect to a flaw in any one of the two different directions. Since the detection electrode wire can be in a damaged state, it is possible to increase the accuracy of the flaw detection without increasing the number of flaw detection electrode wires.
- FIG. 1 is a block diagram showing a piezoelectric speaker device according to a first embodiment of the present invention. It is a perspective view which shows the external appearance of the speaker main body with which the piezoelectric speaker apparatus shown in FIG. 1 is equipped. It is a figure which expands and shows the cross-section of the speaker main body shown in FIG. It is a top view which shows the distribution state of the electrode line for a flaw detection on the insulating layer shown in FIG.
- FIG. 5 is a view corresponding to FIG. 4, showing a state where a flaw detection electrode line is damaged due to a flaw in the speaker body. It is a figure equivalent to FIG. 4 which shows 2nd Embodiment of this invention. It is a figure equivalent to FIG. 4 which shows the 3rd Embodiment of this invention.
- the speaker body 2 is a thin flat plate as shown in FIG. 2, and the overall thickness is about 0.2 to 1 mm. At the time of use, the speaker body 2 may be a flat surface as shown in FIG.
- the speaker body 2 has a cross-sectional structure as shown in FIG. In FIG. 3, the thickness of each element constituting the speaker body 2 is exaggerated.
- the speaker body 2 includes a piezoelectric film 3 made of an organic polymer.
- a piezoelectric film 3 made of an organic polymer.
- PVDF polyvinylidene fluoride
- PLLA L-type polylactic acid
- the former PVDF is known to exhibit relatively high piezoelectricity among organic polymers exhibiting piezoelectricity.
- PLLA has advantages such as high transparency, carbon neutrality, and biodegradability.
- Driving electrodes 4 and 5 for applying a driving voltage for driving the piezoelectric film 3 are formed on each main surface of the piezoelectric film 3.
- the drive electrodes 4 and 5 are mainly composed of an inorganic material such as indium tin oxide, indium / zinc oxide, or zinc oxide, or polythiophene or polyaniline. It is composed of organic materials.
- the drive electrodes 4 and 5 may be made of a metal such as silver, gold, aluminum, copper, or nickel.
- the vibration part of the piezoelectric speaker is constituted by the piezoelectric film 3 and the drive electrodes 4 and 5.
- the vibration part is not limited to the three-layer structure as shown in FIG. Alternatively, a bimorph structure in which the stretching operations of the two laminated piezoelectric films are reversed to each other may be employed.
- the driving electrode 5 located above in FIG. 3 serves as a user-side driving electrode provided on the side of the piezoelectric film 3 that can be touched by the user's hand. It is.
- An electrically insulating insulating layer 6 is formed on the user side driving electrode 5.
- the insulating layer 6 is made of a transparent and flexible resin when the speaker body 2 is required to be transparent.
- resin which comprises the insulating layer 6, it is comprised from resin which has transparency, such as a polyethylene terephthalate, a polyethylene naphthalate, a polymethyl methacrylate, a polycarbonate, a polypropylene, for example.
- a scratch detection electrode line 7 is formed on the insulating layer 6.
- the flaw detection electrode wire 7 can also be formed using the same material as that of the drive electrodes 4 and 5 described above. That is, when the speaker body 2 is required to be transparent, the flaw detection electrode wire 7 is mainly composed of an inorganic material such as indium tin oxide, indium / zinc oxide, or zinc oxide, or polythiophene or polyaniline. If the speaker body 2 is not particularly required to be transparent, it may be made of a metal such as silver, gold, aluminum, copper, or nickel.
- a protective layer 8 is preferably formed on the insulating layer 6 so as to cover the flaw detection electrode wire 7.
- the protective layer 8 is made of a transparent resin such as polyethylene terephthalate, polyethylene naphthalate, polymethyl methacrylate, polycarbonate, and polypropylene.
- an adhesive or the like is applied to a necessary interface for joining the above-described elements, but such an adhesive is not shown in FIG. However, an adhesive is not necessary when thermocompression bonding or the like is applied for joining the elements.
- the display device When the speaker body 2 is combined with a display device such as a flat panel display, an organic EL display, or electronic paper, the display device is disposed on the lower surface side of the driving electrode 4 in the speaker body 2 according to FIG.
- FIG. 1 is a block diagram showing a speaker device 1 including the above-described speaker body 2 and a circuit for driving and controlling the speaker body 2.
- the control IC 10 is connected to the detection circuit 12 via the signal line 11 and is connected to the amplifier 14 via the signal line 13.
- the detection circuit 12 is for detecting whether or not the above-described scratch detection electrode line 7 (see FIG. 3) is in a normal electrical conduction state, and the scratch detection electrode line 7 through the detection signal line 15. It is connected to the.
- a digital acoustic signal obtained from the sound source is sent to the amplifier 14 through the signal line 13, amplified there, and then the amplified acoustic signal is used as a drive voltage as a signal. It is sent to the drive electrodes 4 and 5 (see FIG. 3) via the line 16, and is applied to the piezoelectric film 3 (see FIG. 3) via these drive electrodes 4 and 5. In this way, the speaker body 2 is driven.
- the control line 17 is for controlling the output of the amplifier 14 by a control signal given from the control IC 10.
- FIG. 4 shows a distribution state of the flaw detection electrode wire 7 on the insulating layer 6 as seen through the protective layer 8.
- the flaw detection electrode line 7 is composed of n linear lines 7-1 to 7-n extending in parallel to each other and arranged at equal intervals in a state of being electrically independent from each other.
- Each of the lines 7-1 to 7-n is connected to the above-described detection signal line 15 through a switching element (not shown) made of a transistor or the like, and is connected to the detection circuit 12 through the detection signal line 15. ing.
- the control IC 10 drives the detection circuit 12 to detect the presence or absence of scratches on the surface of the speaker body 2.
- a scratch 9 as shown in FIG. 5 is generated in the speaker main body 2 due to some external force, for example, the wires 7-5 and 7-6 are damaged, resulting in a disconnection or an increase in resistance.
- the detection circuit 12 detects a disconnection or an increase in resistance on the lines 7-5 and 7-6 in accordance with a criterion set in advance in the control IC 10.
- the control IC 10 as drive voltage control means controls the output of the amplifier 14 through the control line 17 so as to reduce the drive voltage applied to the drive electrodes 4 and 5 (see FIG. 3).
- 42.4V or more is considered dangerous to the human body. Therefore, if the drive voltage is lower than 42.4V, an electric shock accident can be sufficiently prevented be able to. Moreover, if the drive voltage is set to 0V, an electric shock accident can be completely prevented.
- the output of the amplifier 14 may be controlled through the control line 17, or the signal output to the signal line 13 may be cut or the source level may be reduced.
- an abnormality notification means for notifying the user that an abnormality has occurred in the speaker body 2 the user can be notified of the abnormality more reliably.
- Examples of notification by the abnormality notification means include display on a display and output of a warning sound. More specifically, a message such as “Speaker breakage. Speaker drive voltage dropped to avoid danger” is displayed on the display.
- a signal may be sent from the control IC 10 to the IC that controls the image, and the display as described above may be realized on the display. In this case, the control IC 10 itself may be integrated with the IC that controls the image.
- a predetermined number of lines such as two or more are formed.
- a control method may be adopted in which it is determined that a flaw has occurred only when the two are simultaneously in a damaged state. According to this control method, it is possible not to immediately determine that the failure mode has been entered in the case of minor scratches that have no problem in function or the partial disconnection of the scratch detection electrode wire 7 due to changes over time. .
- the formation mode of the flaw detection electrode wire can be variously changed as necessary.
- the flaw detection electrode line 7a shown in FIG. 6 includes a plurality of, for example, four meander-like lines 7a-1 to 7a-4 that are electrically independent from each other.
- the number of lines necessary to cover the same area can be reduced as compared with the flaw detection electrode line 7 shown in FIG. Therefore, the circuit configuration can be simplified.
- the flaw detection electrode line 7 shown in FIG. 4 it may be difficult to detect a flaw that occurs in parallel with the extending direction of the lines 7-1 to 7-n.
- the flaw detection electrode line 7a shown in FIG. 5 since each of the lines 7a-1 to 7a-4 has a portion extending in two different directions, the number of lines can be increased or the arrangement density of the lines can be increased. The accuracy and certainty of flaw detection can be improved without increasing
- the lines 7-1 to 7-n shown in FIG. 4 and the lines 7a-1 to 7a-4 shown in FIG. 6 are both shown in a simplified manner because of problems in illustration. Actually, the lines 7-1 to 7-n and the lines 7a-1 to 7a-4 shown in FIG. 6 are arranged more densely, and the line widths and intervals between them are several hundred ⁇ m to It is on the order of several mm.
- the shape and the number of lines constituting the flaw detection electrode line are not particularly limited. As for the shape of the line, there may be a modification such as a spiral shape.
- FIG. 7 shows a modification example in such a case.
- the flaw detection electrode line 7b shown in FIG. 7 consists of only one line, and is partially meandered and spirally as a whole.
- FIG. 7 is also shown in a simplified manner due to the problem of illustration as in FIG.
- the lines 7b shown in FIG. 7 are actually more densely arranged, and the line widths and intervals between the lines are on the order of several hundred ⁇ m to several mm.
- the number of lines constituting the wound detection electrode line may be merely one.
- the number of lines is one, it is not necessary to switch a plurality of lines with a switching element such as a transistor and connect them to the detection circuit 12, so that the circuit configuration can be greatly simplified.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Multimedia (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
Description
2 スピーカ本体
3 圧電フィルム
4 駆動用電極
5 使用者側駆動用電極
6 絶縁層
7,7a,7b 傷検知用電極線
8 保護層
9 傷
10 制御IC
12 検知回路
14 アンプ
Claims (11)
- 有機高分子からなる圧電フィルムと、前記圧電フィルムを駆動するための駆動電圧を前記圧電フィルムに印加するため、前記圧電フィルムに接するように設けられた、少なくとも1対の駆動用電極とを有する、スピーカ本体を備え、
前記駆動用電極は、前記圧電フィルムにおける、使用者の手に触れ得る側に設けられた使用者側駆動用電極を含み、
前記スピーカ本体は、前記使用者側駆動用電極上に形成された絶縁層と、前記絶縁層上に形成された傷検知用電極線とをさらに有し、
前記傷検知用電極線が正常な電気的導通状態にあるか否かを検知するための検知回路と、
前記検知回路の検知結果に応じて、前記駆動用電極に印加されている前記駆動電圧を制御するための駆動電圧制御手段と
をさらに備える、圧電スピーカ装置。 - 前記スピーカ本体は、前記傷検知用電極線を覆うように前記絶縁層上に形成された保護層をさらに有する、請求項1に記載の圧電スピーカ装置。
- 前記検知回路によって前記傷検知用電極線の損傷が確認されたとき、前記スピーカ本体に異常が発生したことを使用者に知らせるための報知手段をさらに備える、請求項1または2に記載の圧電スピーカ装置。
- 前記傷検知用電極線は、前記絶縁層上で、少なくとも互いに異なる2つの方向に延びる部分を有する、請求項1ないし3のいずれかに記載の圧電スピーカ装置。
- 前記傷検知用電極線は、ミアンダ状に延びる部分を含む、請求項4に記載の圧電スピーカ装置。
- 前記傷検知用電極線は、渦巻状に延びる部分を含む、請求項4または5に記載の圧電スピーカ装置。
- 互いに電気的に独立した複数の前記傷検知用電極線を備える、請求項1ないし6のいずれかに記載の圧電スピーカ装置。
- 前記駆動電圧制御手段は、前記検知回路によって前記傷検知用電極線の損傷が確認されたとき、前記駆動用電極に印加されている前記駆動電圧を42.4Vよりも低くする、請求項1ないし7のいずれかに記載の圧電スピーカ装置。
- 前記駆動電圧制御手段は、前記検知回路によって前記傷検知用電極線の損傷が確認されたとき、前記駆動用電極に印加されている前記駆動電圧を0Vとする、請求項8に記載の圧電スピーカ装置。
- 前記圧電フィルムはポリフッ化ビニリデンからなる、請求項1ないし9のいずれかに記載の圧電スピーカ装置。
- 前記圧電フィルムはポリ乳酸からなる、請求項1ないし9のいずれかに記載の圧電スピーカ装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201180049019.XA CN103155596B (zh) | 2010-10-15 | 2011-09-28 | 压电扬声器装置 |
JP2012538623A JP5348333B2 (ja) | 2010-10-15 | 2011-09-28 | 圧電スピーカ装置 |
US13/859,801 US9197973B2 (en) | 2010-10-15 | 2013-04-10 | Piezoelectric speaker device |
US14/886,160 US9807515B2 (en) | 2010-10-15 | 2015-10-19 | Piezoelectric speaker device |
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JP2010-232158 | 2010-10-15 | ||
JP2010232158 | 2010-10-15 |
Related Child Applications (1)
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US13/859,801 Continuation US9197973B2 (en) | 2010-10-15 | 2013-04-10 | Piezoelectric speaker device |
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WO2012049970A1 true WO2012049970A1 (ja) | 2012-04-19 |
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PCT/JP2011/072198 WO2012049970A1 (ja) | 2010-10-15 | 2011-09-28 | 圧電スピーカ装置 |
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US (2) | US9197973B2 (ja) |
JP (1) | JP5348333B2 (ja) |
CN (1) | CN103155596B (ja) |
WO (1) | WO2012049970A1 (ja) |
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EP2953011B1 (en) * | 2013-02-01 | 2019-04-17 | Murata Manufacturing Co., Ltd. | Display device and multilayered optical film |
CN105189106B (zh) * | 2013-04-10 | 2017-10-27 | 三井化学株式会社 | 叠层体 |
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US20160044421A1 (en) | 2016-02-11 |
US20130223637A1 (en) | 2013-08-29 |
CN103155596B (zh) | 2015-09-09 |
CN103155596A (zh) | 2013-06-12 |
JP5348333B2 (ja) | 2013-11-20 |
US9807515B2 (en) | 2017-10-31 |
US9197973B2 (en) | 2015-11-24 |
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