WO2017199929A1 - Plate speaker and method for improving frequency response thereof - Google Patents

Plate speaker and method for improving frequency response thereof Download PDF

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Publication number
WO2017199929A1
WO2017199929A1 PCT/JP2017/018267 JP2017018267W WO2017199929A1 WO 2017199929 A1 WO2017199929 A1 WO 2017199929A1 JP 2017018267 W JP2017018267 W JP 2017018267W WO 2017199929 A1 WO2017199929 A1 WO 2017199929A1
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Prior art keywords
region
wiring pattern
diaphragm
flat speaker
cover material
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PCT/JP2017/018267
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French (fr)
Japanese (ja)
Inventor
賢司 河野
慧 武藤
千尋 桑山
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クラリオン株式会社
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Publication of WO2017199929A1 publication Critical patent/WO2017199929A1/en

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    • 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
    • H04R7/04—Plane diaphragms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type

Definitions

  • the present invention relates to a flat speaker that reproduces a sound source by vibrating a diaphragm and a method for improving the frequency characteristics thereof.
  • a flat speaker that reproduces a sound source by vibrating a flat diaphragm is known.
  • the flat speaker generally has a structure in which a flat frame, a permanent magnet plate, a nonwoven fabric sheet, a flat diaphragm, a nonwoven fabric sheet, a permanent magnet plate, and a flat frame are sequentially stacked.
  • the flat diaphragm is an FPC (Flexible Printed Circuits) in which a predetermined pattern (voice coil) is printed and wired. When the voice coil is energized, it opposes the nonwoven fabric sheet with electromagnetic force according to Fleming's left hand rule. It vibrates in the plate thickness direction between a pair of arranged permanent magnet plates.
  • FPC Flexible Printed Circuits
  • a sound wave generated by vibration (that is, a reproduction sound obtained by reproducing a sound source) is radiated to the outside and is listened to by a listener.
  • Japanese Patent No. 3192372 discloses a specific configuration of this type of flat speaker.
  • the flat speaker since the flat speaker does not increase the impedance characteristic in the high range, the sound pressure level does not decrease compared to the cone speaker.
  • the flat speaker is advantageous for reproducing a sound source including a high sound range such as high resolution audio.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for improving frequency characteristics (particularly, sound pressure level in a high frequency range) and a flat speaker having improved frequency characteristics. That is.
  • a flat speaker includes a flat diaphragm on which a wiring pattern constituting a magnetic circuit is formed, and the thickness of the diaphragm varies from region to region.
  • the diaphragm may have a first region having a reference thickness and at least one second region having a thickness smaller than the first region.
  • the diaphragm may have a configuration in which the thickness of the cover material covering the wiring pattern is different for each region.
  • the cover material covers the wiring pattern in the first region, and the second region is an opening, so that the second region does not cover the wiring pattern. It is good.
  • the wiring pattern may be plated in the second region that is not covered with the cover material.
  • the flat speaker according to the embodiment of the present invention may have a shape drawn out from the diaphragm and provided with a lead portion in which a terminal for connecting a wiring pattern and an external circuit is formed.
  • the wiring pattern and the terminal are formed on the common base material of the diaphragm and the lead-out portion, and the wiring pattern covers the opening of the diaphragm on the opposite side of the base material sandwiching the wiring pattern and the terminal.
  • the terminal is not covered with a cover material and is not covered with a cover material.
  • the cover material includes a first cover material having a first thickness that covers the wiring pattern in the first region, and a first thickness that covers the wiring pattern in the second region. It is good also as a structure which has a 2nd cover material with a 2nd thickness thinner than this.
  • the cover material may include a cover part that covers the entire area of the wiring pattern and a sticking part that is pasted on the cover part.
  • the affixing part may be affixed only to the first region.
  • the second region is, for example, a circle or an ellipse having a major axis in a direction orthogonal to the direction in which the wiring pattern extends.
  • the second region is located, for example, in the approximate center of the diaphragm.
  • each of the second regions may be located in the periphery of the diaphragm.
  • the method according to an embodiment of the present invention is a method for improving the frequency characteristics of a flat speaker by forming a flat diaphragm having a wiring pattern constituting a magnetic circuit with a different thickness for each region. is there.
  • a method for improving frequency characteristics (particularly, sound pressure level at high frequencies) and a flat speaker having improved frequency characteristics.
  • FIG. 1 is an external perspective view showing the external appearance of a flat speaker 1 according to an embodiment of the present invention.
  • the flat speaker 1 is a thin speaker having a substantially rectangular parallelepiped shape in appearance.
  • the flat speaker 1 is a full digital speaker that is directly driven by a digital sound source using a digital signal processing technique such as Dnote (registered trademark), and is mounted on an electronic device such as a thin television or headphones.
  • Dnote registered trademark
  • FIG. 2 is an exploded perspective view showing the configuration of the flat speaker 1 according to the embodiment of the present invention.
  • the flat speaker 1 includes a planar diaphragm 10, a pair of permanent magnet plates 20 that are opposed to each other with a predetermined interval across the plane diaphragm 10, and a pair of permanent magnet plates 20.
  • a metal casing front cover 30 and back plate 40 housed and fixedly supported therein, and a non-woven sheet 50 interposed between the flat diaphragm 10 and each permanent magnet plate 20.
  • the planar diaphragm 10 is a substantially rectangular FPC in which a voice coil 10aa made of a meandering copper foil pattern is printed and wired on at least one surface.
  • the base film and coverlay of the planar diaphragm 10 are formed of a flexible insulating resin film such as a polyethylene terephthalate film or an aromatic polyimide film, for example.
  • the flat speaker 1 is configured to be driven by a multi-voice coil, that is, a plurality of voice coils in order to ensure sound pressure and achieve high-quality reproduction while being driven at a low voltage. For this reason, a plurality of voice coils (meandering copper foil patterns) 10aa are printed on the planar diaphragm 1. In the drawing, for convenience, a plurality of voice coils 10aa wired in a meandering shape are shown as one pattern.
  • the permanent magnet plate 20 has a substantially flat plate shape approximately the same size as the planar diaphragm 10, and is formed of, for example, a resin magnet or a rubber magnet containing ferrite or rare earth magnetic powder.
  • the permanent magnet plate 20 is formed with a parallel striped multipole magnetized pattern in which strip-shaped N poles and S poles appear alternately over the entire surface facing the flat diaphragm 10. In the multipolar magnetization patterns of the pair of permanent magnet plates 20, the N poles and the S poles face each other across the planar diaphragm 10 (and the nonwoven fabric sheet 50).
  • the vicinity of each boundary between the N pole and the S pole is called a neutral zone, and adjacent to each other so as to straddle the neutral zone.
  • a magnetic field from the matching N pole to the S pole is formed. That is, a magnetic field is formed along the surface of the planar diaphragm 10.
  • the permanent magnet plate 20 has a plurality of circular sound wave emission holes 20a penetrating the permanent magnet plate 20 at appropriate positions (for example, in a staggered pattern) on each neutral zone.
  • the flat diaphragm 10 has a linear portion of the voice coil 10aa (a linear portion extending in the Y-axis direction in the drawing) corresponding to the neutral zone of each permanent magnet plate 20 (specifically, the straight line of the voice coil 10aa).
  • the positional relationship with the pair of permanent magnet plates 20 is set so that the portion extends in a direction crossing the magnetic field.
  • the front cover 30 is a high permeability metal part such as an iron plate, and has a substantially rectangular parallelepiped shape with one surface opened.
  • a permanent magnet plate 20 is fixed to the inner surface of the front cover 30 by its own magnetic attractive force.
  • the front cover 30 is also provided with similar sound wave emitting holes 30 a at positions corresponding to the sound wave emitting holes 20 a of the permanent magnet plate 20.
  • the permanent magnet plate 20 may be fixed to the inner surface of the front cover 30 with an adhesive in addition to its own magnetic attractive force.
  • the back plate 40 is also a high permeability metal part such as an iron plate, and has a substantially rectangular parallelepiped shape with one surface opened.
  • the permanent magnet plate 20 is also tightly fixed to the inner side surface of the back plate 40 by its own magnetic attraction force. Similar sound wave emission holes 40 a are formed in the back plate 40 at positions corresponding to the sound wave emission holes 20 a of the permanent magnet plate 20.
  • the permanent magnet plate 20 may be fixed to the inner surface of the back plate 40 with an adhesive in addition to its own magnetic attractive force.
  • the front cover 30 is formed with a plurality of locking claws 30b. Further, the back plate 40 is formed with cuts 40b at positions corresponding to the respective locking claws 30b. When the locking claws 30b are locked to the notches 40b, the front cover 30 and the back plate 40 are fixed, and a flat, substantially rectangular parallelepiped metal casing is completed.
  • the planar diaphragm 10 includes a base film 10b, a copper foil pattern (voice coil 10aa and a terminal 10ab described later) formed on the base film 10b, and a coverlay 10c covering the copper foil pattern.
  • the FPC includes a roughly rectangular portion 10A that is a diaphragm main body, and a drawer portion 10B that is led out from the roughly rectangular portion 10A.
  • a meandering wiring pattern (voice coil 10aa) constituting a magnetic circuit is formed on the base film 10b.
  • the roughly rectangular portion 10A is housed in a metal casing formed by the front cover 30 and the back plate 40, and is accommodated at a position between the pair of permanent magnet plates 20 (more precisely, the pair of non-woven sheets 50).
  • the planar diaphragm 10 is substantially restricted from moving in the XY directions (plate surface direction of the planar diaphragm 10) by the inner wall surface of the metal casing.
  • a terminal (copper foil pattern) 10ab is formed on the base film 10b in a state where the terminal (copper foil pattern) 10ab is exposed from the cover lay 10c at the tip of the drawer portion 10B drawn out from the metal casing.
  • the reinforcing film may be affixed on the back side surface of the front-end
  • the voice coil 10aa has an input / output end connected to the terminal 10ab via a lead pattern formed in the lead portion 10B, and is energized from an energization circuit connected to the terminal 10ab.
  • the planar vibration plate 10 When the planar vibration plate 10 is energized to the voice coil 10aa, the Z-axis direction (flat surface) between the pair of permanent magnet plates 20 (more precisely, the pair of non-woven sheets 50) by electromagnetic force according to Fleming's left-hand rule. Vibrates in the thickness direction of the diaphragm 10. Sound waves generated by vibration (that is, reproduced sound obtained by reproducing a sound source) are radiated to the outside from the sound wave emission holes of the permanent magnet plate 20 and the front cover 30 and the sound wave emission holes of the permanent magnet plate 20 and the back plate 40. Listened to by the listener.
  • the flat speaker 1 can reproduce a digital sound source with high sound quality because there is no deterioration in sound quality due to conventional analog conversion or the like.
  • the approximate rectangular portion 10A is reduced in weight by reducing the thickness of a partial region of the approximately rectangular portion 10A with respect to the reference thickness.
  • the roughly rectangular portion 10A is reduced in weight. ing.
  • a frequency characteristic having a high sound pressure level in a high frequency range can be obtained as compared with a configuration in which the generally rectangular portion 10A is not reduced in weight.
  • the opening 10ca since the opening 10ca is formed, the high frequency range components are concentrated and output from around the opening 10ca. Therefore, an effect that the high frequency range stands out from the viewpoint of hearing is obtained.
  • the opening portion 10ca is made smaller, the high frequency range components are concentrated and output from around the opening portion 10ca. Therefore, the high frequency range is more conspicuous, while the larger the opening portion 10ca is formed, the higher sound range components are not concentrated and are dispersed and output. As a result, the spread of sound increases.
  • the voice coil 10aa is not covered with the cover lay 10c and is exposed in the opening 10ca. Therefore, there is a concern about the rust of the voice coil 10aa. Therefore, the voice coil 10aa in the opening 10ca is plated (for example, gold plating) for rust prevention.
  • strength of voice coil 10aa in opening part 10ca is reinforced by having performed said plating process, the rigidity of the substantially rectangular part 10A becomes high compared with the case where it does not perform a plating process.
  • the roughly rectangular portion 10A is likely to finely vibrate, which is advantageous for improving the gain in the high frequency range. That is, as a secondary effect of performing the above plating process, it is possible to obtain frequency characteristics with a higher sound pressure level in a high frequency range.
  • the size of the opening 10ca may be determined in consideration of the balance between the expansion of the high sound range (sound pressure level in the high frequency region) and the feeling of sound spread.
  • 4A and 4B are a front view and a side cross-sectional view (a cross-sectional view taken along the line BB in FIG. 4A) of the flat diaphragm 10M1 according to the first modification of the present invention, respectively. is there.
  • a total of four openings 101ca are formed in the peripheral portion (four corners) of the roughly rectangular portion 10A.
  • the output of the high frequency range component is appropriately dispersed while appropriately suppressing the low rigidity of the substantially rectangular portion 10A.
  • the resonance is further suppressed and a flat frequency characteristic can be obtained.
  • 5 (a) and 5 (b) are respectively a front view and a side sectional view (a CC sectional view of FIG. 5 (a)) of a flat diaphragm 10M2 according to a second modification of the present invention. is there.
  • an opening 101ca is formed at the center of the roughly rectangular portion 10A.
  • the opening 101ca according to the second modification has an elliptical shape having a major axis in a direction orthogonal to the direction in which the voice coil 10aa extends.
  • the number of voice coils 10aa exposed from the cover lay 10c can be reduced (for example, when the opening 101ca is circular or parallel to the direction in which the voice coil 10aa extends). Therefore, the reduction in the rigidity of the substantially rectangular portion 10A due to the formation of the opening 101ca can be suitably suppressed. Therefore, it is possible to obtain frequency characteristics with a higher sound pressure level in the high frequency range.
  • the shape of the opening 101ca is not limited to a circular shape or an elliptical shape, and may be, for example, an I shape, an L shape, a polygonal shape, or the like.
  • FIGS. 6 to 8 illustrate other methods for reducing the weight of the generally rectangular portion 10A.
  • the voice coil 10aa is, in principle, covered with a coverlay 10c having a reference thickness, but only a part of the region (for example, a region corresponding to the opening 101ca in the above-described embodiment). It is covered with another coverlay 10c1 that is thinner.
  • the entire area of the voice coil 10aa is covered with a coverlay 10c2 having a thickness thinner than the reference, and only a part of the area (for example, an area other than the opening 101ca in the above embodiment) is covered.
  • a sheet 10c3 is attached on 10c2 by adhesion or the like.
  • the sheet 10c3 is illustratively made of the same material as the coverlay 10c2.
  • the total thickness of the coverlay 10c2 and the sheet 10c3 is the reference thickness.
  • the entire area of the voice coil 10aa is covered with the coverlay 10c4.
  • the coverlay 10c4 has a reference thickness, but only a part of the region (for example, a region corresponding to the opening 101ca in the above-described embodiment) is thinner than this (indicated by an arrow in FIG. 8). See the region).
  • the thickness of the partial area of the cover lay is formed thinner than the reference, so that the generally rectangular portion 10A is reduced in weight. Therefore, a frequency characteristic with a high sound pressure level in the high frequency range can be obtained. Further, since the cover lay is formed over the entire area of the approximately rectangular portion 10A, the rigidity of the approximately rectangular portion 10A is preferably suppressed, and the plating process on the voice coil 10aa is not required.

Abstract

A plate speaker provided with a flat diaphragm in which is formed a wiring pattern constituting part of a magnetic circuit, wherein the thickness of the diaphragm is differentiated for each area.

Description

平板スピーカ及びその周波数特性を改善させる方法Flat speaker and method for improving frequency characteristics thereof
　本発明は、振動板を振動させることにより音源を再生する平板スピーカ及びその周波数特性を改善させる方法に関する。 The present invention relates to a flat speaker that reproduces a sound source by vibrating a diaphragm and a method for improving the frequency characteristics thereof.
　平面振動板を振動させることにより音源を再生する平板スピーカが知られている。平板スピーカは、概略的には、平板状フレーム、永久磁石板、不織布シート、平面振動板、不織布シート、永久磁石板、平板状フレームを順に重ねた構成となっている。平面振動板は、所定のパターン（ボイスコイル）がプリント配線されたＦＰＣ（Flexible Printed Circuits）であり、ボイスコイルに通電されると、フレミングの左手の法則に従う電磁力により、不織布シートを挟んで対向配置された一対の永久磁石板の間で板厚方向に振動する。振動によって生じた音波（すなわち、音源を再生した再生音）は外部に放射されて、聴取者によって聴取される。例えば特許第３１９２３７２号公報に、この種の平板スピーカの具体的構成が記載されている。 A flat speaker that reproduces a sound source by vibrating a flat diaphragm is known. The flat speaker generally has a structure in which a flat frame, a permanent magnet plate, a nonwoven fabric sheet, a flat diaphragm, a nonwoven fabric sheet, a permanent magnet plate, and a flat frame are sequentially stacked. The flat diaphragm is an FPC (Flexible Printed Circuits) in which a predetermined pattern (voice coil) is printed and wired. When the voice coil is energized, it opposes the nonwoven fabric sheet with electromagnetic force according to Fleming's left hand rule. It vibrates in the plate thickness direction between a pair of arranged permanent magnet plates. A sound wave generated by vibration (that is, a reproduction sound obtained by reproducing a sound source) is radiated to the outside and is listened to by a listener. For example, Japanese Patent No. 3192372 discloses a specific configuration of this type of flat speaker.
　一般的なコーンスピーカは、高域ほどインピーダンス特性が増加するため、高域における音圧レベルの低下が大きい。これに対し、平板スピーカは、高域におけるインピーダンス特性の増加がないため、コーンスピーカと比べて音圧レベルが低下しない。この点において、平板スピーカは、ハイレゾリューションオーディオ等の高音域を含む音源の再生に有利である。 General cone speakers have a large decrease in sound pressure level at high frequencies because impedance characteristics increase at higher frequencies. On the other hand, since the flat speaker does not increase the impedance characteristic in the high range, the sound pressure level does not decrease compared to the cone speaker. In this respect, the flat speaker is advantageous for reproducing a sound source including a high sound range such as high resolution audio.
　しかし、平板スピーカであっても高域における音圧レベルの低下は避けられない。高音域を含む音源に対して高い再生能力を発揮するためには、平板スピーカにおいても、高域における音圧レベルの低下をより一層抑える（高域における音圧レベルを従来よりも改善させる）ことが望まれる。 However, even with flat speakers, a decrease in sound pressure level at high frequencies is inevitable. In order to demonstrate high playback capability for sound sources including high frequencies, even in flat-panel speakers, the reduction of the sound pressure level in the high frequency is further suppressed (the sound pressure level in the high frequency is improved compared to the conventional level). Is desired.
　本発明は上記の事情に鑑みてなされたものであり、その目的とするところは、周波数特性（特に、高域における音圧レベル）を改善させる方法及び改善した周波数特性を持つ平板スピーカを提供することである。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for improving frequency characteristics (particularly, sound pressure level in a high frequency range) and a flat speaker having improved frequency characteristics. That is.
　本発明の一実施形態に係る平板スピーカは、磁気回路を構成する配線パターンが形成された扁平な振動板を備えており、振動板の厚みが領域毎に異なる。 A flat speaker according to an embodiment of the present invention includes a flat diaphragm on which a wiring pattern constituting a magnetic circuit is formed, and the thickness of the diaphragm varies from region to region.
　また、本発明の一実施形態において、振動板は、基準の厚みを持つ第一領域と、第一領域よりも薄い厚みを持つ少なくとも１つの第二領域とを有する構成としてもよい。 In one embodiment of the present invention, the diaphragm may have a first region having a reference thickness and at least one second region having a thickness smaller than the first region.
　また、本発明の一実施形態において、振動板は、配線パターンを被覆するカバー材の厚みが領域毎に異なる構成としてもよい。 In one embodiment of the present invention, the diaphragm may have a configuration in which the thickness of the cover material covering the wiring pattern is different for each region.
　また、本発明の一実施形態において、カバー材は、第一領域で配線パターンを被覆し、第二領域が開口部となっていることにより、該第二領域で配線パターンを被覆していないものとしてもよい。 In one embodiment of the present invention, the cover material covers the wiring pattern in the first region, and the second region is an opening, so that the second region does not cover the wiring pattern. It is good.
　また、本発明の一実施形態において、配線パターンは、カバー材で被覆されていない第二領域でメッキ処理されていてもよい。 In one embodiment of the present invention, the wiring pattern may be plated in the second region that is not covered with the cover material.
　また、本発明の一実施形態に係る平板スピーカは、振動板から引き出された形状を持ち、配線パターンと外部回路とを接続する端子が形成された引き出し部を備えるものとしてもよい。この場合、振動板と引き出し部の共通のベース材上に配線パターンと端子が形成されており、配線パターン及び端子を挟んだベース材の反対側では、振動板の開口部において該配線パターンがカバー材で被覆されていないと共に、引き出し部において該端子がカバー材で被覆されておらず露出している。 In addition, the flat speaker according to the embodiment of the present invention may have a shape drawn out from the diaphragm and provided with a lead portion in which a terminal for connecting a wiring pattern and an external circuit is formed. In this case, the wiring pattern and the terminal are formed on the common base material of the diaphragm and the lead-out portion, and the wiring pattern covers the opening of the diaphragm on the opposite side of the base material sandwiching the wiring pattern and the terminal. The terminal is not covered with a cover material and is not covered with a cover material.
　また、本発明の一実施形態において、カバー材は、第一領域で配線パターンを被覆する第一の厚みを持つ第一のカバー材と、第二領域で配線パターンを被覆する、第一の厚みよりも薄い、第二の厚みを持つ第二のカバー材とを有する構成としてもよい。 In one embodiment of the present invention, the cover material includes a first cover material having a first thickness that covers the wiring pattern in the first region, and a first thickness that covers the wiring pattern in the second region. It is good also as a structure which has a 2nd cover material with a 2nd thickness thinner than this.
　また、本発明の一実施形態において、カバー材は、配線パターンの全域を被覆するカバー部と、カバー部上に貼り付けられた貼付部とを含む構成としてもよい。貼付部は、第一領域だけに貼り付けられたものとしてもよい。 Further, in one embodiment of the present invention, the cover material may include a cover part that covers the entire area of the wiring pattern and a sticking part that is pasted on the cover part. The affixing part may be affixed only to the first region.
　また、本発明の一実施形態において、第二領域は、例えば、円形状又は配線パターンが延びる方向と直交する方向に長軸を持つ楕円形状である。 In one embodiment of the present invention, the second region is, for example, a circle or an ellipse having a major axis in a direction orthogonal to the direction in which the wiring pattern extends.
　また、本発明の一実施形態において、第二領域は、例えば、振動板の略中央に位置する。 Further, in one embodiment of the present invention, the second region is located, for example, in the approximate center of the diaphragm.
　また、本発明の一実施形態において、第二領域は複数あり、第二領域のそれぞれは、振動板の周辺部に位置するものとしてもよい。 Further, in one embodiment of the present invention, there are a plurality of second regions, and each of the second regions may be located in the periphery of the diaphragm.
　また、本発明の一実施形態に係る方法は、磁気回路を構成する配線パターンが形成された扁平な振動板を領域毎に異なる厚みで形成することにより、平板スピーカの周波数特性を改善させる方法である。 The method according to an embodiment of the present invention is a method for improving the frequency characteristics of a flat speaker by forming a flat diaphragm having a wiring pattern constituting a magnetic circuit with a different thickness for each region. is there.
　本発明の一実施形態によれば、周波数特性（特に、高域における音圧レベル）を改善させる方法及び改善した周波数特性を持つ平板スピーカが提供される。 According to an embodiment of the present invention, there is provided a method for improving frequency characteristics (particularly, sound pressure level at high frequencies) and a flat speaker having improved frequency characteristics.
本発明の一実施形態に係る平板スピーカの外観を示す外観斜視図である。It is an external appearance perspective view which shows the external appearance of the flat speaker which concerns on one Embodiment of this invention. 本発明の一実施形態に係る平板スピーカの構成を示す分解斜視図である。It is a disassembled perspective view which shows the structure of the flat speaker which concerns on one Embodiment of this invention. 本発明の一実施形態に係る平板スピーカに備えられる平面振動板の正面図及び側断面図である。It is the front view and sectional side view of the plane diaphragm with which the flat speaker which concerns on one Embodiment of this invention is equipped. 本発明の第一の変形例に係る平板スピーカに備えられる平面振動板の正面図及び側断面図である。It is the front view and side sectional view of a plane diaphragm with which the flat speaker concerning the 1st modification of the present invention is equipped. 本発明の第二の変形例に係る平板スピーカに備えられる平面振動板の正面図及び側断面図である。It is the front view and side sectional drawing of a plane diaphragm with which the flat speaker concerning the 2nd modification of the present invention is equipped. 平面振動板を軽量化する方法について説明する図である。It is a figure explaining the method of reducing the weight of a plane diaphragm. 平面振動板を軽量化する方法について説明する図である。It is a figure explaining the method of reducing the weight of a plane diaphragm. 平面振動板を軽量化する方法について説明する図である。It is a figure explaining the method of reducing the weight of a plane diaphragm.
　以下、本発明の一実施形態に係る平板スピーカについて図面を参照しながら説明する。 Hereinafter, a flat speaker according to an embodiment of the present invention will be described with reference to the drawings.
　図１は、本発明の一実施形態に係る平板スピーカ１の外観を示す外観斜視図である。図１に示されるように、平板スピーカ１は、外観的には扁平の概略直方体状の薄型スピーカである。平板スピーカ１は、Ｄｎｏｔｅ（登録商標）等のデジタル信号処理技術によりデジタル音源で直接駆動されるフルデジタルスピーカであり、例えば、薄型テレビジョンやヘッドフォン等の電子機器に搭載される。 FIG. 1 is an external perspective view showing the external appearance of a flat speaker 1 according to an embodiment of the present invention. As shown in FIG. 1, the flat speaker 1 is a thin speaker having a substantially rectangular parallelepiped shape in appearance. The flat speaker 1 is a full digital speaker that is directly driven by a digital sound source using a digital signal processing technique such as Dnote (registered trademark), and is mounted on an electronic device such as a thin television or headphones.
　図２は、本発明の一実施形態に係る平板スピーカ１の構成を示す分解斜視図である。図２に示されるように、平板スピーカ１は、平面振動板１０、平面振動板１０を挟んで所定の間隔を空けて対向配置された一対の永久磁石板２０、一対の永久磁石板２０を挟んでその内部に収容し固定支持した金属製筐体（前面カバー３０及び背面板４０）、及び平面振動板１０と各永久磁石板２０との間に介在された不織布シート５０を備えている。 FIG. 2 is an exploded perspective view showing the configuration of the flat speaker 1 according to the embodiment of the present invention. As shown in FIG. 2, the flat speaker 1 includes a planar diaphragm 10, a pair of permanent magnet plates 20 that are opposed to each other with a predetermined interval across the plane diaphragm 10, and a pair of permanent magnet plates 20. And a metal casing (front cover 30 and back plate 40) housed and fixedly supported therein, and a non-woven sheet 50 interposed between the flat diaphragm 10 and each permanent magnet plate 20.
　平面振動板１０は、少なくとも一面に、蛇行形状の銅箔パターンからなるボイスコイル１０ａａがプリント配線された概略矩形のＦＰＣである。平面振動板１０のベースフィルム、カバーレイは、例えば、ポリエチレンテレフタレートフィルムや芳香族ポリイミドフィルム等の可撓性を有する絶縁性樹脂フィルムで形成されている。 The planar diaphragm 10 is a substantially rectangular FPC in which a voice coil 10aa made of a meandering copper foil pattern is printed and wired on at least one surface. The base film and coverlay of the planar diaphragm 10 are formed of a flexible insulating resin film such as a polyethylene terephthalate film or an aromatic polyimide film, for example.
　平板スピーカ１は、低電圧駆動でありつつも音圧を確保すると共に高音質な再生を達成するため、マルチボイスコイル、すなわち、複数のボイスコイルで駆動する構成となっている。そのため、平面振動板１には、複数のボイスコイル（蛇行形状の銅箔パターン）１０ａａがプリント配線されている。なお、図面では、便宜上、蛇行形状に配線された複数のボイスコイル１０ａａを１本のパターンで示している。 The flat speaker 1 is configured to be driven by a multi-voice coil, that is, a plurality of voice coils in order to ensure sound pressure and achieve high-quality reproduction while being driven at a low voltage. For this reason, a plurality of voice coils (meandering copper foil patterns) 10aa are printed on the planar diaphragm 1. In the drawing, for convenience, a plurality of voice coils 10aa wired in a meandering shape are shown as one pattern.
　永久磁石板２０は、平面振動板１０と同程度の大きさの概略平板形状を持ち、例えば、フェライトや希土類磁性粉を含んだ樹脂磁石、ゴム磁石等により形成されている。永久磁石板２０は、帯状のＮ極とＳ極とが交互に現れる平行縞状の多極着磁パターンが平面振動板１０との対向面の全面に亘って形成されている。一対の永久磁石板２０の互いの多極着磁パターンは、平面振動板１０（及び不織布シート５０）を挟んで互いのＮ極同士及びＳ極同士が対向する。 The permanent magnet plate 20 has a substantially flat plate shape approximately the same size as the planar diaphragm 10, and is formed of, for example, a resin magnet or a rubber magnet containing ferrite or rare earth magnetic powder. The permanent magnet plate 20 is formed with a parallel striped multipole magnetized pattern in which strip-shaped N poles and S poles appear alternately over the entire surface facing the flat diaphragm 10. In the multipolar magnetization patterns of the pair of permanent magnet plates 20, the N poles and the S poles face each other across the planar diaphragm 10 (and the nonwoven fabric sheet 50).
　多極着磁パターンが形成された永久磁石板２０の多極着磁パターン面では、Ｎ極とＳ極との各境界付近がニュートラルゾーンと呼ばれており、ニュートラルゾーンを跨ぐように、互いに隣り合うＮ極からＳ極に向かう磁界が形成されている。すなわち、平面振動板１０の表面に沿うように磁界が形成されている。 In the multipolar magnetization pattern surface of the permanent magnet plate 20 on which the multipolar magnetization pattern is formed, the vicinity of each boundary between the N pole and the S pole is called a neutral zone, and adjacent to each other so as to straddle the neutral zone. A magnetic field from the matching N pole to the S pole is formed. That is, a magnetic field is formed along the surface of the planar diaphragm 10.
　また、永久磁石板２０は、各ニュートラルゾーン上の適宜の位置（例えば千鳥格子状）に、永久磁石板２０を貫通する円形の音波放出孔２０ａが複数穿設されている。 Also, the permanent magnet plate 20 has a plurality of circular sound wave emission holes 20a penetrating the permanent magnet plate 20 at appropriate positions (for example, in a staggered pattern) on each neutral zone.
　平面振動板１０は、ボイスコイル１０ａａの直線部分（図中、Ｙ軸方向に延伸する直線部分）が各永久磁石板２０のニュートラルゾーンに対応するように（具体的には、ボイスコイル１０ａａの直線部分が磁界を横切る方向に延伸するように）、一対の永久磁石板２０との位置関係が設定されている。 The flat diaphragm 10 has a linear portion of the voice coil 10aa (a linear portion extending in the Y-axis direction in the drawing) corresponding to the neutral zone of each permanent magnet plate 20 (specifically, the straight line of the voice coil 10aa). The positional relationship with the pair of permanent magnet plates 20 is set so that the portion extends in a direction crossing the magnetic field.
　前面カバー３０は、鉄板等の高透磁率の金属部品であり、一面が開口された概略直方体形状を有している。前面カバー３０の内側面には、永久磁石板２０が自身の磁気吸着力により密着固定されている。前面カバー３０にも、永久磁石板２０の各音波放出孔２０ａに対応する位置に同様の音波放出孔３０ａが穿設されている。なお、永久磁石板２０は、自身の磁気吸着力に加えて接着剤により前面カバー３０の内側面に固定されてもよい。 The front cover 30 is a high permeability metal part such as an iron plate, and has a substantially rectangular parallelepiped shape with one surface opened. A permanent magnet plate 20 is fixed to the inner surface of the front cover 30 by its own magnetic attractive force. The front cover 30 is also provided with similar sound wave emitting holes 30 a at positions corresponding to the sound wave emitting holes 20 a of the permanent magnet plate 20. The permanent magnet plate 20 may be fixed to the inner surface of the front cover 30 with an adhesive in addition to its own magnetic attractive force.
　背面板４０も鉄板等の高透磁率の金属部品であり、一面が開口された概略直方体形状を有している。背面板４０の内側面にも、永久磁石板２０が自身の磁気吸着力により密着固定されている。背面板４０にも、永久磁石板２０の各音波放出孔２０ａに対応する位置に同様の音波放出孔４０ａが穿設されている。なお、永久磁石板２０は、自身の磁気吸着力に加えて接着剤により背面板４０の内側面に固定されてもよい。 The back plate 40 is also a high permeability metal part such as an iron plate, and has a substantially rectangular parallelepiped shape with one surface opened. The permanent magnet plate 20 is also tightly fixed to the inner side surface of the back plate 40 by its own magnetic attraction force. Similar sound wave emission holes 40 a are formed in the back plate 40 at positions corresponding to the sound wave emission holes 20 a of the permanent magnet plate 20. The permanent magnet plate 20 may be fixed to the inner surface of the back plate 40 with an adhesive in addition to its own magnetic attractive force.
　前面カバー３０には、複数の係止爪３０ｂが形成されている。また、背面板４０には、各係止爪３０ｂに対応する位置に切り込み４０ｂが形成されている。各係止爪３０ｂが切り込み４０ｂに係止されることにより、前面カバー３０と背面板４０とが固定されて、扁平の概略直方体状の金属製筐体が完成する。 The front cover 30 is formed with a plurality of locking claws 30b. Further, the back plate 40 is formed with cuts 40b at positions corresponding to the respective locking claws 30b. When the locking claws 30b are locked to the notches 40b, the front cover 30 and the back plate 40 are fixed, and a flat, substantially rectangular parallelepiped metal casing is completed.
　図３（ａ）、図３（ｂ）は、それぞれ、本発明の一実施形態に係る平面振動板１０の正面図、側断面図（図３（ａ）のＡ－Ａ断面図）である。図３に示されるように、平面振動板１０は、ベースフィルム１０ｂ、ベースフィルム１０ｂ上に形成された銅箔パターン（ボイスコイル１０ａａ及び後述の端子１０ａｂ）、銅箔パターンを被覆するカバーレイ１０ｃよりなるＦＰＣであり、振動板本体部である概略矩形部１０Ａ、及び概略矩形部１０Ａから引き出された引き出し部１０Ｂを有している。 3 (a) and 3 (b) are a front view and a side sectional view (a sectional view taken along line AA in FIG. 3 (a)), respectively, of the planar diaphragm 10 according to the embodiment of the present invention. As shown in FIG. 3, the planar diaphragm 10 includes a base film 10b, a copper foil pattern (voice coil 10aa and a terminal 10ab described later) formed on the base film 10b, and a coverlay 10c covering the copper foil pattern. The FPC includes a roughly rectangular portion 10A that is a diaphragm main body, and a drawer portion 10B that is led out from the roughly rectangular portion 10A.
　概略矩形部１０Ａには、磁気回路を構成する蛇行形状の配線パターン（ボイスコイル１０ａａ）がベースフィルム１０ｂ上に形成されている。概略矩形部１０Ａは、前面カバー３０と背面板４０とによる金属製筐体内であって、一対の永久磁石板２０（より正確には、一対の不織布シート５０）の間の位置に収容されている。平面振動板１０は、金属製筐体の内壁面によってＸＹ方向（平面振動板１０の板面方向）の移動が実質的に規制されている。 In the roughly rectangular portion 10A, a meandering wiring pattern (voice coil 10aa) constituting a magnetic circuit is formed on the base film 10b. The roughly rectangular portion 10A is housed in a metal casing formed by the front cover 30 and the back plate 40, and is accommodated at a position between the pair of permanent magnet plates 20 (more precisely, the pair of non-woven sheets 50). . The planar diaphragm 10 is substantially restricted from moving in the XY directions (plate surface direction of the planar diaphragm 10) by the inner wall surface of the metal casing.
　金属製筐体から引き出された引き出し部１０Ｂの先端には、端子（銅箔パターン）１０ａｂがカバーレイ１０ｃから露出した状態でベースフィルム１０ｂ上に形成されている。なお、ベースフィルム１０ｂには、引き出し部１０Ｂの先端（端子１０ａｂが形成されている部分）の裏側面に補強フィルムが貼り付けられていてもよい。 A terminal (copper foil pattern) 10ab is formed on the base film 10b in a state where the terminal (copper foil pattern) 10ab is exposed from the cover lay 10c at the tip of the drawer portion 10B drawn out from the metal casing. In addition, the reinforcing film may be affixed on the back side surface of the front-end | tip (part in which terminal 10ab is formed) of the drawer | drawing-out part 10B at the base film 10b.
　ボイスコイル１０ａａは、その入出力端が引き出し部１０Ｂに形成された引き出しパターンを介して端子１０ａｂと接続されており、端子１０ａｂと接続された通電回路より通電される。 The voice coil 10aa has an input / output end connected to the terminal 10ab via a lead pattern formed in the lead portion 10B, and is energized from an energization circuit connected to the terminal 10ab.
　平面振動板１０は、ボイスコイル１０ａａに通電されると、フレミングの左手の法則に従う電磁力により一対の永久磁石板２０（より正確には、一対の不織布シート５０）の間でＺ軸方向（平面振動板１０の板厚方向）に振動する。振動によって生じた音波（すなわち、音源を再生した再生音）は、永久磁石板２０及び前面カバー３０の各音波放出孔並びに永久磁石板２０及び背面板４０の各音波放出孔より外部に放射されて、聴取者によって聴取される。平板スピーカ１では、従来のアナログ変換等に伴う音質の劣化が無いため、デジタル音源を高音質で再生することができる。 When the planar vibration plate 10 is energized to the voice coil 10aa, the Z-axis direction (flat surface) between the pair of permanent magnet plates 20 (more precisely, the pair of non-woven sheets 50) by electromagnetic force according to Fleming's left-hand rule. Vibrates in the thickness direction of the diaphragm 10. Sound waves generated by vibration (that is, reproduced sound obtained by reproducing a sound source) are radiated to the outside from the sound wave emission holes of the permanent magnet plate 20 and the front cover 30 and the sound wave emission holes of the permanent magnet plate 20 and the back plate 40. Listened to by the listener. The flat speaker 1 can reproduce a digital sound source with high sound quality because there is no deterioration in sound quality due to conventional analog conversion or the like.
　本実施形態では、カバーレイ１０ｃの一部の形状を削減してその重量を軽くすることにより、振動板本体部である概略矩形部１０Ａが軽量化されている。言い換えると、概略矩形部１０Ａの一部の領域の厚みを基準の厚みに対して薄くすることにより、概略矩形部１０Ａが軽量化されている。具体的には、図３に示されるように、カバーレイ１０ｃについて概略矩形部１０Ａの中央領域に穴を空ける（円形状の開口部１０ｃａを形成する）ことにより、概略矩形部１０Ａが軽量化されている。概略矩形部１０Ａが軽量化されることにより、概略矩形部１０Ａを振動させるのに必要な電磁力が小さく抑えられて、高域における利得が改善する。 In the present embodiment, by reducing the shape of part of the cover lay 10c and reducing its weight, the generally rectangular portion 10A that is the diaphragm main body is lightened. In other words, the approximate rectangular portion 10A is reduced in weight by reducing the thickness of a partial region of the approximately rectangular portion 10A with respect to the reference thickness. Specifically, as shown in FIG. 3, by making a hole in the central region of the roughly rectangular portion 10A in the coverlay 10c (forming a circular opening 10ca), the roughly rectangular portion 10A is reduced in weight. ing. By reducing the weight of the approximately rectangular portion 10A, the electromagnetic force required to vibrate the approximately rectangular portion 10A is suppressed to be small, and the gain in the high frequency region is improved.
　このように、本実施形態によれば、概略矩形部１０Ａを軽量化しない構成と比べて、高域における音圧レベルが高い周波数特性が得られる。 Thus, according to the present embodiment, a frequency characteristic having a high sound pressure level in a high frequency range can be obtained as compared with a configuration in which the generally rectangular portion 10A is not reduced in weight.
　なお、開口部１０ｃａを形成したことにより、概略矩形部１０Ａの剛性が局所的に変化するため、共振が抑制されて、よりフラットに近い周波数特性が得られる。 In addition, since the rigidity of the substantially rectangular portion 10A is locally changed by forming the opening 10ca, resonance is suppressed and a frequency characteristic closer to flat is obtained.
　また、開口部１０ｃａを形成したことにより、開口部１０ｃａ辺りから高音域成分が集中して出力されるようになる。そのため、聴感上、高音域が際立つという効果が得られる。開口部１０ｃａを小さく形成するほど高音域成分が開口部１０ｃａ辺りから集中して出力されるため、高音域が際立つ一方、開口部１０ｃａを大きく形成するほど高音域成分が集中せず分散して出力されるため、音の広がり感が増加する。 In addition, since the opening 10ca is formed, the high frequency range components are concentrated and output from around the opening 10ca. Therefore, an effect that the high frequency range stands out from the viewpoint of hearing is obtained. As the opening portion 10ca is made smaller, the high frequency range components are concentrated and output from around the opening portion 10ca. Therefore, the high frequency range is more conspicuous, while the larger the opening portion 10ca is formed, the higher sound range components are not concentrated and are dispersed and output. As a result, the spread of sound increases.
　また、開口部１０ｃａを形成したことにより、開口部１０ｃａ内では、ボイスコイル１０ａａがカバーレイ１０ｃによって被覆されておらず露出している。そのため、ボイスコイル１０ａａの錆が懸念される。そこで、開口部１０ｃａ内のボイスコイル１０ａａは、防錆のため、メッキ処理（例えば金メッキ）が施されている。 Further, since the opening 10ca is formed, the voice coil 10aa is not covered with the cover lay 10c and is exposed in the opening 10ca. Therefore, there is a concern about the rust of the voice coil 10aa. Therefore, the voice coil 10aa in the opening 10ca is plated (for example, gold plating) for rust prevention.
　なお、上記のメッキ処理を施したことにより、開口部１０ｃａ内のボイスコイル１０ａａの強度が補強されるため、メッキ処理を施さない場合と比べて、概略矩形部１０Ａ全体の剛性が高くなる。これにより、概略矩形部１０Ａが微細振動しやすくなり、高域における利得の改善に有利となる。すなわち、上記のメッキ処理を施したことによる副次的な効果として、高域における音圧レベルがより一層高い周波数特性を得ることが可能となる。 In addition, since the intensity | strength of voice coil 10aa in opening part 10ca is reinforced by having performed said plating process, the rigidity of the substantially rectangular part 10A becomes high compared with the case where it does not perform a plating process. As a result, the roughly rectangular portion 10A is likely to finely vibrate, which is advantageous for improving the gain in the high frequency range. That is, as a secondary effect of performing the above plating process, it is possible to obtain frequency characteristics with a higher sound pressure level in a high frequency range.
　開口部１０ｃａを大きく形成するほど概略矩形部１０Ａを軽量化できる一方、概略矩形部１０Ａが低剛性化することによる、高域における音圧レベルの低下が懸念される。そこで、開口部１０ｃａの大きさは、高音域の伸び（高域における音圧レベル）と音の広がり感とのバランスを考慮して決定してもよい。 As the opening portion 10ca is formed larger, the weight of the roughly rectangular portion 10A can be reduced. On the other hand, there is a concern that the sound pressure level in the high range is lowered due to the lower rigidity of the roughly rectangular portion 10A. Therefore, the size of the opening 10ca may be determined in consideration of the balance between the expansion of the high sound range (sound pressure level in the high frequency region) and the feeling of sound spread.
　以上が本発明の例示的な実施形態の説明である。本発明の実施形態は、上記に説明したものに限定されず、本発明の技術的思想の範囲において様々な変形が可能である。例えば明細書中に例示的に明示される実施例等又は自明な実施例等を適宜組み合わせた内容も本願の実施形態に含まれる。 This completes the description of the exemplary embodiment of the present invention. Embodiments of the present invention are not limited to those described above, and various modifications are possible within the scope of the technical idea of the present invention. For example, the embodiment of the present application also includes contents appropriately combined with examples and the like clearly shown in the specification or obvious examples.
　なお、以降においては、上記の実施形態に係る平板スピーカ１と同一の又は同様の構成には同一の又は同様の符号を付して説明を適宜簡略又は省略する。 In the following, the same or similar components as those of the flat speaker 1 according to the above embodiment are denoted by the same or similar reference numerals, and the description thereof will be simplified or omitted as appropriate.
　図４（ａ）、図４（ｂ）は、それぞれ、本発明の第一の変形例に係る平面振動板１０Ｍ１の正面図、側断面図（図４（ａ）のＢ－Ｂ断面図）である。 4A and 4B are a front view and a side cross-sectional view (a cross-sectional view taken along the line BB in FIG. 4A) of the flat diaphragm 10M1 according to the first modification of the present invention, respectively. is there.
　図４に示されるように、第一の変形例では、概略矩形部１０Ａの周辺部（四隅）に合計で４つの開口部１０１ｃａが形成されている。第一の変形例によれば、比較的小さい開口部１０１ｃａを複数形成することにより、概略矩形部１０Ａの低剛性化を適度に抑えつつ高音域成分の出力も適度に分散されるため、高音域の伸び（高域における音圧レベル）と音の広がり感とを高いレベルで両立させることができる。また、概略矩形部１０Ａの局所的な剛性の変化が複雑になるため、より一層、共振が抑制されてフラットな周波数特性を得ることが可能となる。 As shown in FIG. 4, in the first modification, a total of four openings 101ca are formed in the peripheral portion (four corners) of the roughly rectangular portion 10A. According to the first modified example, by forming a plurality of relatively small openings 101ca, the output of the high frequency range component is appropriately dispersed while appropriately suppressing the low rigidity of the substantially rectangular portion 10A. Can be achieved at a high level with both the spread of sound (the sound pressure level in the high frequency range) and the sense of sound spread. In addition, since the change in local rigidity of the roughly rectangular portion 10A becomes complicated, the resonance is further suppressed and a flat frequency characteristic can be obtained.
　図５（ａ）、図５（ｂ）は、それぞれ、本発明の第二の変形例に係る平面振動板１０Ｍ２の正面図、側断面図（図５（ａ）のＣ－Ｃ断面図）である。 5 (a) and 5 (b) are respectively a front view and a side sectional view (a CC sectional view of FIG. 5 (a)) of a flat diaphragm 10M2 according to a second modification of the present invention. is there.
　図５に示されるように、第二の変形例では、概略矩形部１０Ａの中央部に開口部１０１ｃａが形成されている。第二の変形例に係る開口部１０１ｃａは、ボイスコイル１０ａａが延びる方向と直交する方向に長軸を持つ楕円形状となっている。このような向きで楕円状の開口部１０１ｃａを形成することにより、カバーレイ１０ｃから露出するボイスコイル１０ａａの本数を（例えば開口部１０１ｃａを円形状とする場合やボイスコイル１０ａａが延びる方向と平行な方向に長軸を持つ楕円形状とする場合と比べて）多くすることができるため、開口部１０１ｃａを形成したことによる略矩形部１０Ａの低剛性化が好適に抑えられる。そのため、高域における音圧レベルがより一層高い周波数特性を得ることが可能となる。 As shown in FIG. 5, in the second modification, an opening 101ca is formed at the center of the roughly rectangular portion 10A. The opening 101ca according to the second modification has an elliptical shape having a major axis in a direction orthogonal to the direction in which the voice coil 10aa extends. By forming the elliptical opening 101ca in such an orientation, the number of voice coils 10aa exposed from the cover lay 10c can be reduced (for example, when the opening 101ca is circular or parallel to the direction in which the voice coil 10aa extends). Therefore, the reduction in the rigidity of the substantially rectangular portion 10A due to the formation of the opening 101ca can be suitably suppressed. Therefore, it is possible to obtain frequency characteristics with a higher sound pressure level in the high frequency range.
　なお、開口部１０１ｃａの形状は、円形状や楕円形状に限らず、例えばＩ字状やＬ字状、多角形状等であってもよい。 Note that the shape of the opening 101ca is not limited to a circular shape or an elliptical shape, and may be, for example, an I shape, an L shape, a polygonal shape, or the like.
　上記の実施形態では、概略矩形部１０Ａを軽量化するため、概略矩形部１０Ａの一部の領域を開口形状としているが、概略矩形部１０Ａを軽量化する方法はこれに限らない。図６～図８に、概略矩形部１０Ａを軽量化する他の方法について例示する。 In the above embodiment, in order to reduce the weight of the approximate rectangular portion 10A, a part of the approximate rectangular portion 10A has an opening shape, but the method of reducing the approximate rectangular portion 10A is not limited thereto. FIGS. 6 to 8 illustrate other methods for reducing the weight of the generally rectangular portion 10A.
　図６の例では、ボイスコイル１０ａａは、原則、基準の厚みを持つカバーレイ１０ｃで被覆されているが、一部の領域（例えば上記の実施形態の開口部１０１ｃａに対応する領域）のみ、これよりも薄い別のカバーレイ１０ｃ１で被覆されている。 In the example of FIG. 6, the voice coil 10aa is, in principle, covered with a coverlay 10c having a reference thickness, but only a part of the region (for example, a region corresponding to the opening 101ca in the above-described embodiment). It is covered with another coverlay 10c1 that is thinner.
　図７の例では、基準よりも薄い厚みを持つカバーレイ１０ｃ２によりボイスコイル１０ａａの全域が被覆されており、一部の領域（例えば上記の実施形態の開口部１０１ｃａ以外の領域）のみ、カバーレイ１０ｃ２上にシート１０ｃ３が接着等で貼り付けられている。シート１０ｃ３は、例示的には、カバーレイ１０ｃ２と同素材である。例えば、カバーレイ１０ｃ２とシート１０ｃ３の合計で基準の厚みとなる。 In the example of FIG. 7, the entire area of the voice coil 10aa is covered with a coverlay 10c2 having a thickness thinner than the reference, and only a part of the area (for example, an area other than the opening 101ca in the above embodiment) is covered. A sheet 10c3 is attached on 10c2 by adhesion or the like. The sheet 10c3 is illustratively made of the same material as the coverlay 10c2. For example, the total thickness of the coverlay 10c2 and the sheet 10c3 is the reference thickness.
　図８の例では、カバーレイ１０ｃ４によりボイスコイル１０ａａの全域が被覆されている。カバーレイ１０ｃ４は、原則、基準の厚みを持つが、一部の領域（例えば上記の実施形態の開口部１０１ｃａに対応する領域）のみ、これよりも薄くなっている（図８中、矢印で指された領域を参照）。 In the example of FIG. 8, the entire area of the voice coil 10aa is covered with the coverlay 10c4. In principle, the coverlay 10c4 has a reference thickness, but only a part of the region (for example, a region corresponding to the opening 101ca in the above-described embodiment) is thinner than this (indicated by an arrow in FIG. 8). See the region).
　図６～図８の何れの例においても、カバーレイの一部の領域の厚みが基準よりも薄く形成されていることにより、概略矩形部１０Ａが軽量化されている。そのため、高域における音圧レベルが高い周波数特性が得られる。また、概略矩形部１０Ａの全域に亘ってカバーレイが形成されているため、概略矩形部１０Ａの低剛性化が好適に抑えられると共にボイスコイル１０ａａへのメッキ処理が不要となる。 In any of the examples in FIGS. 6 to 8, the thickness of the partial area of the cover lay is formed thinner than the reference, so that the generally rectangular portion 10A is reduced in weight. Therefore, a frequency characteristic with a high sound pressure level in the high frequency range can be obtained. Further, since the cover lay is formed over the entire area of the approximately rectangular portion 10A, the rigidity of the approximately rectangular portion 10A is preferably suppressed, and the plating process on the voice coil 10aa is not required.

Claims (22)

  1. 　磁気回路を構成する配線パターンが形成された扁平な振動板
    を備え、
    　前記振動板の厚みが領域毎に異なる、
    平板スピーカ。     It has a flat diaphragm on which a wiring pattern that forms a magnetic circuit is formed,
    The thickness of the diaphragm is different for each region,
    Flat speaker.
  2. 　前記振動板は、
    　　基準の厚みを持つ第一領域と、
    　　前記第一領域よりも薄い厚みを持つ少なくとも１つの第二領域と、
    を有する、
    請求項１に記載の平板スピーカ。     The diaphragm is
    A first region having a reference thickness;
    At least one second region having a thickness less than said first region;
    Having
    The flat speaker according to claim 1.
  3. 　前記振動板は、
    　　前記配線パターンを被覆するカバー材の厚みが領域毎に異なる、
    請求項１又は請求項２に記載の平板スピーカ。     The diaphragm is
    The thickness of the cover material covering the wiring pattern is different for each region,
    The flat speaker according to claim 1 or 2.
  4. 　前記カバー材は、
    　　前記第一領域で前記配線パターンを被覆し、
    　　前記第二領域が開口部となっていることにより、前記第二領域で前記配線パターンを被覆していない、
    請求項２を引用する請求項３に記載の平板スピーカ。     The cover material is
    Covering the wiring pattern with the first region;
    Since the second region is an opening, the wiring pattern is not covered with the second region.
    The flat speaker according to claim 3 quoting claim 2.
  5. 　前記配線パターンは、
    　　前記カバー材で被覆されていない第二領域でメッキ処理されている、
    請求項４に記載の平板スピーカ。     The wiring pattern is
    Plated in the second region not covered with the cover material,
    The flat speaker according to claim 4.
  6. 　前記振動板から引き出された形状を持ち、前記配線パターンと外部回路とを接続する端子が形成された引き出し部
    を備え、
    　前記振動板と前記引き出し部の共通のベース材上に前記配線パターンと前記端子が形成されており、
    　前記配線パターン及び前記端子を挟んだ前記ベース材の反対側では、前記振動板の開口部において前記配線パターンが前記カバー材で被覆されていないと共に、前記引き出し部において前記端子が前記カバー材で被覆されておらず露出している、
    請求項４又は請求項５に記載の平板スピーカ。     Having a shape drawn out from the diaphragm, and having a lead portion in which a terminal for connecting the wiring pattern and an external circuit is formed;
    The wiring pattern and the terminal are formed on a common base material of the diaphragm and the lead portion,
    On the opposite side of the base material across the wiring pattern and the terminal, the wiring pattern is not covered with the cover material in the opening of the diaphragm, and the terminal is covered with the cover material in the lead-out portion. Is not exposed,
    The flat speaker according to claim 4 or 5.
  7. 　前記カバー材は、
    　　前記第一領域で前記配線パターンを被覆する第一の厚みを持つ第一のカバー材と、
    　　前記第二領域で前記配線パターンを被覆する、前記第一の厚みよりも薄い、第二の厚みを持つ第二のカバー材と、
    　を有する、
    請求項２を引用する請求項３に記載の平板スピーカ。     The cover material is
    A first cover material having a first thickness covering the wiring pattern in the first region;
    A second cover material having a second thickness that is thinner than the first thickness and covers the wiring pattern in the second region;
    Having
    The flat speaker according to claim 3 quoting claim 2.
  8. 　前記カバー材は、
    　　前記配線パターンの全域を被覆するカバー部と、
    　　前記カバー部上に貼り付けられた貼付部と、
    　を含み、
    　　前記貼付部は、
    　　　前記第一領域だけに貼り付けられている、
    請求項２を引用する請求項３に記載の平板スピーカ。     The cover material is
    A cover portion covering the entire area of the wiring pattern;
    An affixing part affixed on the cover part;
    Including
    The affixing part is
    Affixed only to the first region,
    The flat speaker according to claim 3 quoting claim 2.
  9. 　前記第二領域は、
    　　円形状又は前記配線パターンが延びる方向と直交する方向に長軸を持つ楕円形状である、
    請求項２を引用する、請求項３から請求項８の何れか一項に記載の平板スピーカ。     The second region is
    A circular shape or an elliptical shape having a major axis in a direction orthogonal to the direction in which the wiring pattern extends,
    The flat speaker according to any one of claims 3 to 8, which is cited from claim 2.
  10. 　前記第二領域は、
    　　前記振動板の略中央に位置する、
    請求項２を引用する、請求項３から請求項９の何れか一項に記載の平板スピーカ。     The second region is
    Located in the approximate center of the diaphragm,
    The flat speaker according to any one of claims 3 to 9, wherein the second aspect is cited.
  11. 　前記第二領域は複数あり、
    　前記第二領域のそれぞれは、前記振動板の周辺部に位置する、
    請求項２を引用する、請求項３から請求項９の何れか一項に記載の平板スピーカ。     There are a plurality of the second regions,
    Each of the second regions is located in the periphery of the diaphragm,
    The flat speaker according to any one of claims 3 to 9, wherein the second aspect is cited.
  12. 　磁気回路を構成する配線パターンが形成された扁平な振動板を領域毎に異なる厚みで形成することにより、平板スピーカの周波数特性を改善させる方法。 A method for improving the frequency characteristics of a flat speaker by forming a flat diaphragm on which a wiring pattern constituting a magnetic circuit is formed with a different thickness for each region.
  13. 　前記振動板を、基準の厚みを持つ第一領域と、前記第一領域よりも薄い厚みを持つ少なくとも１つの第二領域とを有する構成とする、
    請求項１２に記載の平板スピーカの周波数特性を改善させる方法。     The diaphragm is configured to have a first region having a reference thickness and at least one second region having a thickness thinner than the first region.
    The method of improving the frequency characteristic of the flat speaker of Claim 12.
  14. 　前記配線パターンを被覆するカバー材を領域毎に異なる厚みで形成することにより、前記振動板の厚みを領域毎で異ならせる、
    請求項１２又は請求項１３に記載の平板スピーカの周波数特性を改善させる方法。     By forming the cover material covering the wiring pattern with a different thickness for each region, the thickness of the diaphragm is made different for each region,
    The method of improving the frequency characteristic of the flat speaker of Claim 12 or Claim 13.
  15. 　前記カバー材について前記第二領域を開口形状とする、
    請求項１３を引用する請求項１４に記載の平板スピーカの周波数特性を改善させる方法。     About the cover material, the second region has an opening shape.
    15. A method for improving the frequency characteristics of a flat speaker according to claim 14, which refers to claim 13.
  16. 　前記カバー材で被覆されていない第二領域で前記配線パターンをメッキ処理する、
    請求項１５に記載の平板スピーカの周波数特性を改善させる方法。     Plating the wiring pattern in a second region not covered with the cover material;
    The method of improving the frequency characteristic of the flat speaker of Claim 15.
  17. 　前記振動板においてベース材上に形成された前記配線パターンが前記カバー材で被覆され、
    　前記振動板から引き出された形状を持つ引き出し部において前記振動板と共通のベース材上に前記配線パターンと外部回路とを接続する端子が形成され、
    　前記配線パターン及び前記端子を挟んだ前記ベース材の反対側で、前記振動板の開口形状部分において前記配線パターンが前記カバー材で被覆されていないと共に、前記引き出し部において前記端子が前記カバー材で被覆されておらず露出している、
    請求項１５又は請求項１６に記載の平板スピーカの周波数特性を改善させる方法。     The wiring pattern formed on the base material in the diaphragm is covered with the cover material,
    A terminal for connecting the wiring pattern and an external circuit is formed on a base material common to the diaphragm in a drawer portion having a shape drawn from the diaphragm,
    The wiring pattern is not covered with the cover material in the opening shape portion of the diaphragm on the opposite side of the base material across the wiring pattern and the terminal, and the terminal is the cover material in the lead-out portion. Uncovered, exposed,
    The method of improving the frequency characteristic of the flat speaker of Claim 15 or Claim 16.
  18. 　前記カバー材を、前記第一領域で前記配線パターンを被覆する第一の厚みを持つ第一のカバー材と、前記第二領域で前記配線パターンを被覆する前記第一の厚みよりも薄い第二の厚みを持つ第二のカバー材とを有する構成とする、
    請求項１３を引用する請求項１４に記載の平板スピーカの周波数特性を改善させる方法。     The cover material includes a first cover material having a first thickness covering the wiring pattern in the first region, and a second thinner than the first thickness covering the wiring pattern in the second region. And a second cover material having a thickness of
    15. A method for improving the frequency characteristics of a flat speaker according to claim 14, which refers to claim 13.
  19. 　前記カバー材を、前記配線パターンの全域を被覆するカバー部と、前記カバー部上に貼り付けられた貼付部とを含む構成とし、
    　前記貼付部を、前記第一領域だけに貼り付ける、
    請求項１３を引用する請求項１４に記載の平板スピーカの周波数特性を改善させる方法。     The cover material includes a cover portion that covers the entire area of the wiring pattern, and a pasting portion that is pasted on the cover portion.
    Affixing the affixing part only on the first region,
    15. A method for improving the frequency characteristics of a flat speaker according to claim 14, which refers to claim 13.
  20. 　前記第二領域を、円状の領域又は前記配線パターンが延びる方向と直交する方向に長軸を持つ楕円状の領域とする、
    請求項１３を引用する、請求項１４から請求項１９の何れか一項に記載の平板スピーカの周波数特性を改善させる方法。     The second region is a circular region or an elliptical region having a major axis in a direction orthogonal to the direction in which the wiring pattern extends.
    20. A method for improving the frequency characteristics of a flat speaker according to any one of claims 14 to 19 quoting claim 13.
  21. 　前記第二領域を、前記振動板の略中央に位置させる、
    請求項１３を引用する、請求項１４から請求項２０の何れか一項に記載の平板スピーカの周波数特性を改善させる方法。     The second region is positioned substantially in the center of the diaphragm;
    21. A method for improving the frequency characteristics of a flat speaker according to any one of claims 14 to 20 quoting claim 13.
  22. 　前記第二領域は複数あり、
    　前記第二領域のそれぞれを、前記振動板の周辺部に位置させる、
    請求項１３を引用する、請求項１４から請求項２０の何れか一項に記載の平板スピーカの周波数特性を改善させる方法。     There are a plurality of the second regions,
    Each of the second regions is located in the periphery of the diaphragm;
    21. A method for improving the frequency characteristics of a flat speaker according to any one of claims 14 to 20 quoting claim 13.
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JP2001211498A (en) * 2000-01-27 2001-08-03 Matsushita Electric Ind Co Ltd Speaker
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