JP2005130156A - Sound reproducing device - Google Patents

Sound reproducing device Download PDF

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JP2005130156A
JP2005130156A JP2003362795A JP2003362795A JP2005130156A JP 2005130156 A JP2005130156 A JP 2005130156A JP 2003362795 A JP2003362795 A JP 2003362795A JP 2003362795 A JP2003362795 A JP 2003362795A JP 2005130156 A JP2005130156 A JP 2005130156A
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speaker
sound
piezoelectric
housing
enclosure
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JP4148097B2 (en )
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Shinji Hashimoto
Takashi Maruyama
Rei Yoshida
隆 丸山
玲 吉田
伸次 橋本
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Victor Co Of Japan Ltd
日本ビクター株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a sound reproducing device incorporating a piezoelectric speaker as a sound output means.
SOLUTION: A portable MD reproducing device 30 is a sound reproducing device for reading out, reproducing, and outputting digital audio data recorded in an MD 1 and is provided with a piezoelectric speaker 17 as a sound output means. The piezoelectric speaker 17 has; a cover-like speaker enclosure 2 which is provided with sound emission holes 3 in a principal surface 2a and has an end surface 2b in the open side opposed to the principal surface, attached and fixed to an enclosure 19 of the portable MD reproducing device 20 by a fixing means K1; a diaphragm 7 which has a spacer 6 having a vibration absorbing property, arranged in an outer peripheral part 5 thereof so that the outer peripheral part 5 is attached and fixed in the speaker enclosure 2 a prescribed gap apart from the principal surface 2a; a piezoelectric element 10 which has a thin film electrode formed on a principal surface thereof and is fixed to both surfaces of the diaphragm; and a connection means K2 for conductive connection from the thin film electrode 8 of the piezoelectric element 10 to an output circuit 21 in the enclosure 19.
COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、コンパクト・ディスク(略してCDと称される。)、ミニ・ディスク(略してMDと称される。)或いはDVDオーディオ等のディスク記録媒体に記録されたデジタル・オーディオ・データを読み出し、再生し、出力する音響再生装置に関し、特に、携帯型の音響再生装置の音響出力手段に関する。 The present invention is a compact disk (for short referred to as CD.), A mini disk (for short referred to as MD.) Or reading the digital audio data recorded on the disk recording medium such as a DVD audio It reproduces relates sound reproducing apparatus which outputs, in particular, to sound output means of the portable audio reproduction device.

従来よりCDやMD等を再生する携帯型の音響再生装置(再生専用装置及び記録再生装置を含む。)が商品化されているが、これら携帯型の音響再生装置はその筺体の容積の小さいこと及び駆動源として電池を用いていることからダイナミック・スピーカを筺体に内蔵させることが困難であり、再生・増幅された音声を専ら音響出力手段としてのイヤホン或いはヘッドホンで聴く方式が採用されている。 Conventionally (including playback-only device and a recording and reproducing apparatus.) The portable audio reproduction device for reproducing the CD or MD, etc. but have been commercialized, that these portable audio playback apparatus of small volume of the housing and is a dynamic speaker from the fact that by using a battery as the drive source is difficult to incorporate in the housing, a method of listening to audio played and amplified exclusively with earphones or headphones as the sound output means is employed.

また、上記携帯型の音響再生装置の中には、配備された外部出力端子にアンプとダイナミック・スピーカを別途接続して、屋内で据え置きのCD/MDステレオコンポとしても利用することができるタイプもある。 Further, in the portable audio playback device, separately connect the amplifier and dynamic speaker deployed external output terminal, even types that can be utilized as a stationary of CD / MD stereo components indoors is there.

一方、種々の家庭電化製品において、単音乃至単純な複数音階のお知らせブザーとして汎用されているスピーカに圧電形スピーカ(主としてチタンジルコン酸鉛(PZT)等の強誘電体セラミックス等を圧電材を振動源とするスピーカ。)がある。 On the other hand, in a variety of household appliances, vibration source piezoelectric material ferroelectric ceramics such as piezoelectric type speaker to the speaker, which is widely used as BEEP single tone or a simple multiple scale (mainly lead zirconate titanate (PZT) there is a speaker.) to.

上記圧電形スピーカは、一般に主面に銀ペースト等を塗布して薄膜電極が形成された圧電材からなる薄い圧電素子が直径20mm程度の薄い円板形状の真鍮等の振動板の中央に貼着され、前記薄膜電極からリード線が導出された圧電要素をプラスチック等のスピーカ筺体に収納した構造であり、前記圧電要素の厚さは1mm以下と非常に薄く、小型、低消費電力、低コストに特徴を有する。 The piezoelectric type speaker, generally attached at the center of the diaphragm of the brass of the thin disc-shaped thin piezoelectric elements silver paste or the like by coating a piezoelectric material thin film electrode was formed of about 20mm diameter on the major surface is a structure that houses the speaker housing such as plastic piezoelectric element lead is derived from the thin film electrode, the thickness of the piezoelectric element is 1mm or less and a very thin, compact, low power consumption, low cost having the features. しかし、音楽を再生対象とする音響再生装置のスピーカとしては、可聴域の周波数特性が悪く出力も小さいので、前述のように家庭電化製品のブザーや電話機のスピーカ程度に適用範囲が限られていた。 However, as the speaker sound reproducing apparatus for music reproduced, since the audible range of the frequency characteristic is bad output is small, the application range has been limited to about a speaker of the buzzer and phone home appliances as described above .

最近では、上記圧電形スピーカの小型・薄型、低消費電力等の特徴を生かして、デスクトップ型或いはラップトップ型のパーソナルコンピュータに内蔵されるスピーカとしての適用が為され始めている。 Recently, the above piezoelectric type speaker compact and thin, taking advantage of the features such as low power consumption, the application of a speaker built in the desktop or laptop personal computers have begun been made.

この点、下記[特許文献1]には、コンピュータ等の可撓性を有するポリマーのハウジング(シェル)に圧電スピーカの振動板を直接に取り付けて、振動板と共にハウジング自身を機械的に振動させて音を出すようにした構成の圧電形スピーカを音響出力手段とする技術が記載されている。 In this respect, the following [Patent Document 1], the diaphragm of the piezoelectric speaker directly attached to the polymer housing having a flexible, such as a computer (Shell), and mechanically vibrate the housing itself with the diaphragm technology of the acoustic output means of the piezoelectric type speaker having the configuration as produce sound is described.

特表2002−507849号公報 JP-T 2002-507849 JP

最近では、上記圧電形スピーカの周波数特性の改善が進み、音響再生装置における簡易の音響出力手段のスピーカとして適用が可能になってきている。 Recently, improvement of the frequency characteristics of the piezoelectric type speaker advances, it has become possible to apply as a speaker for a simple sound output means in the sound reproduction apparatus.

CDやMD或いはDVDオーディオ等のディスク記録媒体に記録されたデジタル・オーディオ・データを読み出し、再生し、出力する携帯型の音響再生装置において、イヤホンやヘッドホン以外の音響出力手段として、装置内蔵のスピーカを備えることはユーザーにとってディスク記録媒体の再生確認等の際に便利であることは疑いないが、再生中にディスク記録媒体の読み出し手段である光ピックアップ部に極力振動を与えないようにすることが特に重要となる。 It reads the digital audio data recorded on the disk recording medium such as a CD or MD, or DVD audio, the portable audio reproducing apparatus which reproduces and outputs, as the sound output means other than earphones or headphones, device embedded speaker undoubtedly be provided with is useful during reproduction confirmation of the disk recording medium to the user, but is possible not give as much as possible vibration to the optical pickup unit is a reading unit of a disk recording medium during playback In particular, it is important.

この点、仮に携帯型の小さな音響再生装置の筺体にダイナミック・スピーカを備え付けるとスピーカの振動が筺体から光ピックアップに伝わってしまうので問題があり、また、前述のようにスピーカの占有容積、消費電力の点でも採用が難しかった。 In this regard, there are if a problem since the outfitting dynamic speaker vibration of the speaker will be transmitted to the optical pickup from the housing to the housing of the portable small audio reproduction device, also occupies the volume of the speaker as described above, power consumption adopted in terms of it was difficult.

また、前記[特許文献1]の圧電形スピーカの振動を筺体に積極的に伝達させて筺体自身をも振動させてスピーカとして利用する技術は、ラップトップ型コンピュータ等の比較的大きな電子機器に対しては採用可能であるが、ディスク記録媒体を再生し、出力する小さな携帯型の音響再生装置に対しては振動の影響を回避する観点から採用できない。 Moreover, the use technology as the vibration of the piezoelectric type speaker also vibrates the housing itself actively is transmitted to the housing speaker [Patent Document 1], compared relatively large electronic devices such as laptop computers It can be employed Te, but reproduces the disk recording medium, can not be employed from the viewpoint of avoiding the influence of vibration for small portable audio reproduction device for outputting.

本発明は上記事情に鑑みてなされたものであり、特に、ディスク記録媒体に記録されたデジタル・オーディオ・データを読み出し、再生し、出力する携帯型の音響再生装置における音響出力手段として、圧電形スピーカを備えた音響再生装置を提供することを課題とする。 The present invention has been made in view of the above circumstances, in particular, reads the digital audio data recorded on the disk recording medium, as the sound output means in the portable audio reproducing apparatus which reproduces and outputs, Piezoelectric to provide a sound reproducing apparatus having a speaker and an object.

本発明は、上記課題を達成するために、ディスク記録媒体1に記録されたデジタル・オーディオ・データを読み出し、再生し、筺体19に取り付けられた圧電形スピーカ17から出力する音響再生装置30であって、前記圧電形スピーカ17は、主面2aに放音孔3を備えるとともに前記主面2aに対向する開放側の端面2bが前記音響再生装置30の筺体19に固定手段K1によって接着固定された蓋状のスピーカ筺体2と、外周部分5が振動吸収特性を有するスペーサ6を介して前記スピーカ筺体2の内部に前記主面2aから所定間隔離して接着固定された振動板7と、薄膜電極8が主面に形成されるとともに前記振動板7の片面又は両面に固着された圧電材9からなる圧電素子10と、前記圧電素子10の前記薄膜電極8から前記音響 The present invention, in order to achieve the above object, reads the digital audio data recorded on the disk recording medium 1, and reproduction, sound reproduction device 30 outputs from the piezoelectric type speaker 17 attached to the housing 19 met Te, the piezoelectric type speaker 17, the end surface 2b of the open side opposite to the main surface 2a provided with a sound outlet 3 on the main surface 2a is adhered and fixed by fixing means K1 to the housing 19 of the sound reproducing device 30 a lid-shaped loudspeaker housing 2, a diaphragm 7 is adhered and fixed from the inside to the main surface 2a of the via spacers 6 loudspeaker housing 2 by a predetermined distance apart with a vibration absorption characteristic peripheral portion 5, the thin-film electrode 8 the acoustic but the piezoelectric element 10 composed of a piezoelectric material 9 which is fixed to one or both sides of the diaphragm 7 is formed in a main surface, from the thin film electrode 8 of the piezoelectric element 10 生装置30の筺体19内の出力回路21に導電接続する接続手段K2と、を有する圧電形スピーカ17であることを特徴とする音響再生装置30を提供する。 To provide an acoustic reproduction apparatus 30 which is a piezoelectric type speaker 17 having a connection means K2 conductively connected to the output circuit 21 in the housing 19 of the raw device 30.

本発明に係る音響再生装置は、上記のように構成されているため、 Since sound reproducing apparatus according to the present invention, which is constructed as described above,
(1)圧電形スピーカの振動板の振動が音響再生装置の筺体とスピーカの筺体との間に介されたスペーサに吸収されて音響再生装置の筺体に直接伝わらず、ディスク記録媒体の光ピックアップ部に圧電形スピーカの振動の影響を与えないので、音飛びの生じない安定した再生ができる。 (1) Vibration of the diaphragm of the piezoelectric type speaker is absorbed by the spacer interposed between the casing of the housing and the speaker of the sound reproduction device is not transmitted directly to the housing of the sound reproducing apparatus, the optical pickup of the disk recording medium does not affect the vibration of the piezoelectric-type speaker in, it does not cause sound skipping it is stable reproduction.
(2)サイズアップが殆ど無しに低コストでスピーカを音響出力手段として内蔵するディスク記録媒体に記録されたデジタル・オーディオ・データを読み出し、再生し、出力する携帯型の音響再生装置が実現する。 (2) reads out the digital audio data recorded on the disk recording medium having a built-in speaker as the sound output means in size up cost without almost reproduced, portable audio reproducing apparatus is realized to be output.

本発明に係る音響再生装置の最良の実施の形態につき、適用が想定される携帯型MD再生装置を例に図面に基づいて説明する。 Per the preferred embodiment of the sound reproducing apparatus according to the present invention will be described with reference to the drawings a portable MD reproducing apparatus applied is assumed as an example.

図1は、本発明に係る携帯型MD再生装置の圧電形スピーカを取り付けた構造を説明するための模式断面図である。 Figure 1 is a schematic cross-sectional view for explaining a portable MD structure fitted with piezoelectric type speaker reproducing apparatus according to the present invention. 図2は、本発明に係る圧電形スピーカの取り付け構造を説明するための拡大模式断面図である。 Figure 2 is an enlarged schematic cross-sectional view for explaining the mounting structure of the piezoelectric type speaker according to the present invention. 図3は、本発明に係る携帯型MD再生装置の外観例を示す斜視図である。 Figure 3 is a perspective view showing an external appearance of a portable MD reproducing apparatus according to the present invention.

図1又は図2又は図3において、本発明に係る携帯型MD再生装置30は、ディスク記録媒体(MD)1に記録されたデジタル・オーディオ・データを光ピックアップ部Pで読み出し、再生し、出力する音響再生装置であって、特に、主面2aに放音孔3を備えるとともに前記主面2aに対向する開放側の端面2bが前記携帯型MD再生装置30の筺体19に固定手段K1によって接着固定された蓋状のスピーカ筺体2と、外周部分5が振動吸収特性を有するスペーサ6を介して前記スピーカ筺体2の内部に前記主面2aから所定間隔離して接着固定された振動板7と、薄膜電極8が主面に形成されるとともに前記振動板7の両面(又は片面)に固着された圧電材9からなる圧電素子10と、前記圧電素子10の前記薄膜電極8から前記携帯 1 or FIG. 2 or FIG. 3, the portable MD reproducing apparatus 30 according to the present invention reads the digital audio data recorded on the disc recording medium (MD) 1 by the optical pickup unit P, and reproduced, the output acoustic a reproducing apparatus, in particular, bonded by fixing means K1 end face 2b of the open side opposite to the main surface 2a within the housing 19 of the portable MD player 30 provided with a sound outlet 3 on the principal surface 2a of a fixed lid-like speaker housing 2, a diaphragm 7 is adhered and fixed from the inside to the main surface 2a of the via spacers 6 loudspeaker housing 2 by a predetermined distance apart with a vibration absorption characteristic peripheral portion 5, a piezoelectric element 10 in which a thin film electrode 8 is made of a piezoelectric material 9 which is fixed on both sides (or one side) of the diaphragm 7 is formed in a main surface, said portable from the thin film electrode 8 of the piezoelectric element 10 MD再生装置30の筺体19内の出力回路21に導電接続する接続手段K2と、を有する圧電形スピーカ17を音響出力手段として備えることを特徴とする。 And connecting means K2 conductively connected to the output circuit 21 in the housing 19 of the MD reproducing apparatus 30, a piezoelectric type speaker 17 having, characterized in that it comprises a sound output means.

この携帯型MD再生装置30では、圧電素子10を固着した振動板7を直接に携帯型MD再生装置30の筺体19に取り付けるのではなく、スピーカ筺体2に振動吸収特性を有するスペーサ6を介して取り付け、このスピーカ筺体2が上記携帯型MD再生装置30の筺体19に取り付けられている2ハウジング構成なので、光ピックアップ部Pに圧電スピーカ17の振動を直接伝えず、振動/音圧を抑制した音響再生装置を実現しているのである。 In the portable MD player 30, rather than attached to the housing 19 of the portable MD player 30 with the diaphragm 7 which is fixed to the piezoelectric element 10 directly, via a spacer 6 having a vibration absorbing property to the speaker housing 2 mounting, sound the speaker housing 2 since two housing structure mounted to the housing 19 of the portable MD player 30, which does not convey the vibrations of the piezoelectric speaker 17 directly to the optical pickup unit P, and suppress vibration / sound pressure with each other to realize a reproducing apparatus. 以下、各部材を説明する。 Below, an explanation will be given of members.

上記スピーカ筺体2は、プラスチック製若しくはアルミ等の金属製であり、高さ2〜3mm程度の薄い蓋状のシェルとなっていて、図3に示されるように携帯型MD再生装置30の筺体19の外表面に固定手段K1で固定されている。 The speaker housing 2 is made of a metal such as plastic or aluminum, it has become a high 2~3mm about a thin lid-like shell, casing 19 of the portable MD player 30 as shown in FIG. 3 are fixed by fixing means K1 to the outer surface. この固定手段K1は例えば強力な接着力を有する両面接着テープや合成樹脂接着剤である。 The fixing means K1 is double-sided adhesive tape or a synthetic resin adhesive having a strong adhesive strength, for example.

上記スペーサ6は、厚さ0.5〜1.5mm、幅2mm程度で振動板7の直径に合わせたリング形状であり、所謂スポンジ形態の多孔質ゴムからなり、振動吸収特性を有するものである。 The spacer 6 has a thickness of 0.5 to 1.5 mm, a ring shape matching the diameter of the diaphragm 7 at a width of about 2 mm, a porous rubber so-called sponge form, and has a vibration absorbing characteristics . このスペーサ6の厚さは動板7と筺体19との間を所定間隔離して振動板7の振動空間を確保するとともに振動を筺体19に伝えないのに必要十分な厚さとする。 The thickness of the spacer 6 requires thick enough not to transmit the vibrations to the housing 19 while securing the vibration space of the vibration plate 7 between the in isolation between predetermined and rotation plate 7 and the housing 19.

上記振動板7は、直径20〜30mm、厚さ0.02〜0.1mm程度の円形の銅板、リン青銅板、ステンレス板或いはアルミ板等である。 The diaphragm 7 has a diameter 20 to 30 mm, thickness 0.02~0.1mm approximately circular copper plate, phosphor bronze plate, a stainless plate or an aluminum plate or the like.

上記圧電材9は、一枚又は積層成形された円盤状のチタンジルコン酸鉛(PZT)等の強誘電体セラミックスであり、上記薄膜電極8は、例えば銀ペーストを前記圧電材(一枚又は積層された複数枚)の各主面に塗布形成したものである。 The piezoelectric material 9 is a ferroelectric ceramic such single or multilayer molded disk-shaped lead zirconate titanate (PZT), the thin film electrode 8, for example, a silver paste the piezoelectric material (single or multilayer by a plurality a) is obtained by coating formed on each principal surface of the. 上記圧電素子10を固着した振動板7からなる圧電要素は、振動板7が直径23mmの円板状の場合で厚さ0.7mm程度と非常に薄いものである。 The piezoelectric element comprising a piezoelectric element 10 from the diaphragm 7 which is fixed, the vibration plate 7 is very thin and thickness 0.7mm approximately in the case of a disc having a diameter of 23 mm.

上記接続手段K2は、例えば図2に示されるように、前記薄膜電極8から振動板7の径方向に導出された各リード線14がターミナル端子15に接続され、携帯型MD再生装置30の筺体19内の出力回路21からイヤホン22との出力切替スイッチSWを介して接続されているターミナル端子16と導通するように構成されている。 Said connecting means K2, as shown for example in FIG. 2, the lead wires 14 led out in the radial direction of the diaphragm 7 from the thin film electrode 8 is connected to the terminal pin 15, the portable MD player 30 housing is configured to conduct the terminal pin 16 from the output circuit 21 in 19 are connected via the output switch SW of the earphone 22.

なお、上記構造に加えて、図1、図2の携帯型MD再生装置30では、振動板7の音響再生装置側にアルミ等の金属製或いはプラスチック製のカバー12が設けられており、これも振動板7の外周部にスペーサ6と同様のスペーサ6′を介して所定距離離して配設されている。 In addition to the above structure, FIG. 1, the portable MD player 30 of FIG. 2, a metal or plastic cover 12 such as aluminum is provided on the sound reproducing apparatus side of the diaphragm 7, which is also It is disposed apart a predetermined distance through the same spacer 6 'and the spacer 6 to the outer peripheral portion of the diaphragm 7.

上記カバー12には、中央に放音孔13が設けられているものの、概ね振動板7の振動による音圧を音響再生装置側に直接放出しないようにする音圧調整手段の作用を有しており、配設することが望ましい。 To the cover 12, although the sound emission hole 13 in the center is provided, generally has the effect of sound pressure adjusting means for the sound pressure due to the vibration of the vibration plate 7 so as not to release directly to the sound reproducing apparatus cage, it is desirable to dispose.

上記構造の携帯型MD再生装置30は、音響出力手段として薄くて小さい圧電形スピーカ17を内蔵していることから、付加価値の高い製品であるにもかかわらず、コストや容積の増加は従来品と比べて殆どなく、ダイナミック・スピーカで問題となる漏洩磁束もないという特長を有する。 Portable MD reproducing apparatus of the structure 30, thin and small piezoelectric type speaker 17 since it is built, despite the high value-added products, an increase in cost and volume of conventional products as the sound output means have the advantage that almost no no leakage flux which is a problem in the dynamic speaker compared with.

念のために付言すれば、以上の説明は携帯型MD再生装置であったが、これ以外のディスク記録媒体の音響再生装置、例えば携帯型CD再生装置や携帯型DVDオーディオ再生装置等も本発明の音響再生装置の射程内であることは勿論である。 As mentioned in addition to the just in case, above description was the portable MD player, an audio reproducing device other than this disc recording medium, for example, portable CD player, a portable DVD audio reproducing device also present invention it is of course within the range of the sound reproduction apparatus.

本発明に係る音響再生装置の模式断面図である。 It is a schematic cross-sectional view of a sound reproducing apparatus according to the present invention. 本発明に係る音響再生装置における圧電形スピーカの取り付け構造を示す拡大断面図である。 It is an enlarged sectional view showing a mounting structure of a piezoelectric type speaker in the audio reproducing apparatus according to the present invention. 本発明に係る携帯型のMD再生装置の斜視図である。 It is a perspective view of a portable MD reproducing apparatus according to the present invention.

符号の説明 DESCRIPTION OF SYMBOLS

1 ディスク記録媒体(MD) 1 disk recording medium (MD)
2 スピーカ筺体 2a 主面 2b 開放側端面 3、13 放音孔 5 振動板の外周部分 6、6′ スペーサ 7 振動板 8 薄膜電極 9 圧電材 10 圧電素子 12 カバー 14 リード線15、16 ターミナル端子 17 圧電形スピーカ 19 筺体 21 出力回路 22 イヤホン 30 携帯型MD再生装置 K1 固定手段 K2 接続手段 SW 出力切替スイッチ 2 speaker housing 2a major surface 2b open end surface 3,13 sound emission hole 5 diaphragm outer circumferential portion 6,6 'spacer 7 diaphragm 8 thin-film electrode 9 piezoelectric member 10 piezoelectric element 12 cover 14 leads 15, 16 Terminal pin 17 piezoelectric speakers 19 housing 21 output circuit 22 earphone 30 portable MD player K1 fixing means K2 connecting means SW output switch

Claims (1)

  1. ディスク記録媒体に記録されたデジタル・オーディオ・データを読み出し、再生し、筺体に取り付けられた圧電形スピーカから出力する音響再生装置であって、 Reads the digital audio data recorded on the disk recording medium, and reproduction, a sound reproducing apparatus to be output from the piezoelectric type speaker attached to the housing,
    前記圧電形スピーカは、主面に放音孔を備えるとともに前記主面に対向する開放側の端面が前記音響再生装置の筺体に固定手段によって接着固定された蓋状のスピーカ筺体と、外周部分が振動吸収特性を有するスペーサを介して前記スピーカ筺体の内部に前記主面から所定間隔離して接着固定された振動板と、薄膜電極が主面に形成されるとともに前記振動板の片面又は両面に固着された圧電材からなる圧電素子と、前記圧電素子の前記薄膜電極から前記音響再生装置の筺体内の出力回路に導電接続する接続手段と、を有する圧電形スピーカであることを特徴とする音響再生装置。 The piezoelectric type speaker, a lid-shaped speaker enclosure is adhered and fixed end surface of the open side by fixing means to the housing of the sound reproducing apparatus opposite to said main surface provided with a sound output hole in the main surface, the peripheral portion secured to one or both surfaces of the diaphragm and the vibration plate which is adhered and fixed to a predetermined distance apart from the main surface into the interior of the speaker housing via a spacer having a vibration absorbing property, together with the thin film electrode is formed on the main surface sound reproduction, wherein the piezoelectric element made of a piezoelectric material which is, to be a piezoelectric type speaker having a connection means for electrically connected to an output circuit within the enclosure of the acoustic reproducing apparatus from the thin film electrode of said piezoelectric element apparatus.

JP2003362795A 2003-10-23 2003-10-23 Sound reproducing apparatus Expired - Fee Related JP4148097B2 (en)

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WO2008056800A1 (en) 2006-11-09 2008-05-15 Nec Corporation Piezoelectric speaker and electronic apparatus with piezoelectric speaker
JP2009289160A (en) * 2008-05-30 2009-12-10 Toshiba Corp Electronic apparatus
US7869206B2 (en) 2008-09-05 2011-01-11 Apple Inc. Handheld computing device
US8250724B2 (en) 2008-09-05 2012-08-28 Apple Inc. Method for handheld computer device
US8391010B2 (en) 2010-08-19 2013-03-05 Apple Inc. Internal frame optimized for stiffness and heat transfer
US8427379B2 (en) 2010-08-19 2013-04-23 Apple Inc. Modular material antenna assembly
US8477492B2 (en) 2010-08-19 2013-07-02 Apple Inc. Formed PCB
US8515113B2 (en) 2010-08-19 2013-08-20 Apple Inc. Composite microphone boot to optimize sealing and mechanical properties
US8634204B2 (en) 2010-08-19 2014-01-21 Apple Inc. Compact folded configuration for integrated circuit packaging
US9287627B2 (en) 2011-08-31 2016-03-15 Apple Inc. Customizable antenna feed structure
US9406999B2 (en) 2011-09-23 2016-08-02 Apple Inc. Methods for manufacturing customized antenna structures
US9602914B2 (en) 2010-08-27 2017-03-21 Apple Inc. Porting audio using a connector in a small form factor electronic device

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008056800A1 (en) 2006-11-09 2008-05-15 Nec Corporation Piezoelectric speaker and electronic apparatus with piezoelectric speaker
CN101536546B (en) 2006-11-09 2012-10-03 日本电气株式会社 Piezoelectric speaker and electronic apparatus with piezoelectric speaker
US8116487B2 (en) 2006-11-09 2012-02-14 Nec Corporation Piezoelectric speaker and electronic apparatus with piezoelectric speaker
JP4551949B2 (en) * 2008-05-30 2010-09-29 株式会社東芝 Electronics
US7916889B2 (en) 2008-05-30 2011-03-29 Kabushiki Kaisha Toshiba Electronic apparatus
JP2009289160A (en) * 2008-05-30 2009-12-10 Toshiba Corp Electronic apparatus
US8488833B2 (en) 2008-05-30 2013-07-16 Kabushiki Kaisha Toshiba Electronic apparatus
US7869206B2 (en) 2008-09-05 2011-01-11 Apple Inc. Handheld computing device
US8250724B2 (en) 2008-09-05 2012-08-28 Apple Inc. Method for handheld computer device
US8427379B2 (en) 2010-08-19 2013-04-23 Apple Inc. Modular material antenna assembly
US8477492B2 (en) 2010-08-19 2013-07-02 Apple Inc. Formed PCB
US8391010B2 (en) 2010-08-19 2013-03-05 Apple Inc. Internal frame optimized for stiffness and heat transfer
US8515113B2 (en) 2010-08-19 2013-08-20 Apple Inc. Composite microphone boot to optimize sealing and mechanical properties
US8634204B2 (en) 2010-08-19 2014-01-21 Apple Inc. Compact folded configuration for integrated circuit packaging
US9049801B2 (en) 2010-08-19 2015-06-02 Apple Inc. Internal frame optimized for stiffness and heat transfer
US9602914B2 (en) 2010-08-27 2017-03-21 Apple Inc. Porting audio using a connector in a small form factor electronic device
US9287627B2 (en) 2011-08-31 2016-03-15 Apple Inc. Customizable antenna feed structure
US9406999B2 (en) 2011-09-23 2016-08-02 Apple Inc. Methods for manufacturing customized antenna structures

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