JPH053800B2 - - Google Patents
Info
- Publication number
- JPH053800B2 JPH053800B2 JP58152086A JP15208683A JPH053800B2 JP H053800 B2 JPH053800 B2 JP H053800B2 JP 58152086 A JP58152086 A JP 58152086A JP 15208683 A JP15208683 A JP 15208683A JP H053800 B2 JPH053800 B2 JP H053800B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric element
- cabinet
- speaker device
- spacer
- cabinet body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 125000006850 spacer group Chemical group 0.000 claims description 15
- 238000005452 bending Methods 0.000 description 6
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005520 electrodynamics Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明はラジオ、ラジオ付きカセツトテープレ
コーダ等の音響機器用のスピーカ装置に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a speaker device for audio equipment such as a radio or a cassette tape recorder with a radio.
従来例の構成とその問題点
近年、ラジオ、ラジオ付きカセツトテープレコ
ーダ等の音響機器は、非常に小形コンパクト化さ
れてきている。その中にあつて、小形化を阻害す
る一つの要因として、スピーカ形状があげられ
る。現状のスピーカはコーン形状振動板と磁気回
路より構成された動電型スピーカが主流であり、
セツト部品の中でも最も大きなものの１つとなつ
てきている。この問題を解決するためセツトを構
成するキヤビネツトの一部に圧電素子を直接取り
付けてキヤビネツトを振動板として利用する再生
方式が考えられた。以下に従来のこの方式のスピ
ーカについて説明する。Conventional configurations and their problems In recent years, audio equipment such as radios and cassette tape recorders with radios have become extremely small and compact. Among these, one factor that hinders miniaturization is the shape of the speaker. The current mainstream of speakers is electrodynamic speakers, which are composed of a cone-shaped diaphragm and a magnetic circuit.
It has become one of the largest set parts. In order to solve this problem, a regeneration method was devised in which a piezoelectric element was directly attached to a part of the cabinet constituting the set and the cabinet was used as a diaphragm. A conventional speaker of this type will be explained below.
第１図、第２図は従来のスピーカ装置を備えた
ラジオセツトであり、第１図は外観図、第２図は
構造断面図を示す。同図において、１はセツトを
構成するキヤビネツト本体、３はダイアル部、４
は各種電気部品６を配置する基板であり、圧電素
子２はキヤビネツト本体１に直接強固に接着され
ている。５は圧電素子２に電気信号を送るための
リード線である。 1 and 2 show a radio set equipped with a conventional speaker device, with FIG. 1 showing an external view and FIG. 2 showing a structural sectional view. In the figure, 1 is the main body of the cabinet that constitutes the set, 3 is the dial part, and 4 is the main body of the cabinet.
is a board on which various electrical components 6 are arranged, and the piezoelectric element 2 is directly and firmly bonded to the cabinet body 1. 5 is a lead wire for sending an electric signal to the piezoelectric element 2.
以上のように構成された従来方式のスピーカ装
置について、以下その動作を説明する。 The operation of the conventional speaker device configured as described above will be described below.
上記構成のスピーカ装置は、セツトのキヤビネ
ツト本体に圧電素子を直接取り付け、この圧電素
子によりキヤビネツト本体を振動させて音の再生
を図るものである。即ち、リード線５を介して圧
電素子２に電気信号を印加すると、圧電素子２に
屈曲振動を伴なう駆動力が生じ、この駆動力によ
りキヤビネツト本体が振動する。キヤビネツト本
体１はセツトの外形形状を構成する部品であるた
め振動面積が広く、圧電素子２からの駆動力を効
率よく音響出力に変換することが出来るものであ
る。また上記圧電素子は従来の動電型スピーカに
比べて大幅に薄形となり、セツトの小形コンパク
ト化が実現できるものであつた。 In the speaker device having the above structure, a piezoelectric element is directly attached to the set's cabinet body, and the piezoelectric element vibrates the cabinet body to reproduce sound. That is, when an electric signal is applied to the piezoelectric element 2 via the lead wire 5, a driving force is generated in the piezoelectric element 2 accompanied by bending vibration, and this driving force causes the cabinet body to vibrate. Since the cabinet body 1 is a component that constitutes the external shape of the set, it has a wide vibration area and can efficiently convert the driving force from the piezoelectric element 2 into acoustic output. Furthermore, the piezoelectric element is significantly thinner than conventional electrodynamic speakers, making it possible to make the set smaller and more compact.
しかしながら、上記のような構成では、圧電素
子２の片側全面をキヤビネツト本体１に接着する
ため、キヤビネツト本体１に駆動力を与える圧電
素子２の屈曲振動が抑えられ、特に振幅が大とな
る低音域では著しい音圧レベルの低下が生じて低
音の不足した非常に再生帯域の狭いスピーカ装置
となつていた。 However, in the above configuration, since one entire surface of the piezoelectric element 2 is bonded to the cabinet body 1, the bending vibration of the piezoelectric element 2 that provides the driving force to the cabinet body 1 is suppressed, especially in the low frequency range where the amplitude is large. However, the sound pressure level was significantly lowered, resulting in a speaker device with a very narrow reproduction band and lacking in bass.
発明の目的
本発明は上記従来の問題点を解消するもので、
きわめて簡易な構成で、従来の再生帯域より広い
低音域まで再生できるキヤビネツト本体直接駆動
方式のスピーカ装置を提供することを目的とす
る。Purpose of the invention The present invention solves the above-mentioned conventional problems.
It is an object of the present invention to provide a speaker device of a direct drive type with a cabinet main body, which has an extremely simple configuration and can reproduce a bass range wider than a conventional reproduction band.
発明の構成
本発明はキヤビネツト本体と、圧電素子との間
を圧電素子の中央部に設けた連結用のスペーサに
より結合固着したスピーカ装置であり、圧電素子
の中央部のみをキヤビネツトと結合固着するた
め、その周辺部は自由端となつて低音域における
屈曲振動が容易となり、振動部となるキヤビネツ
ト本体への駆動力が大となつて、低音域の再生が
可能となるものである。Structure of the Invention The present invention is a speaker device in which a cabinet body and a piezoelectric element are connected and fixed together by a connecting spacer provided at the center of the piezoelectric element, and only the center part of the piezoelectric element is connected and fixed to the cabinet. The peripheral portion becomes a free end, facilitating bending vibration in the low frequency range, and the driving force to the main body of the cabinet, which serves as the vibrating portion, becomes large, making it possible to reproduce the low frequency range.
実施例の説明
第３図は本発明の第１の実施例におけるスピー
カ装置をラジオセツトに組み込んだ構造断面図を
示すものである。同図において第１図、第２図で
示した従来例と同一構成部品には同一番号を付し
てある。第３図において、圧電素子２はキヤビネ
ツト本体１との間に間隙ｄを保つて保持する。圧
電素子とキヤビネツトとの結合部の詳細を第４図
に示す。第４図において圧電素子は金属性の中間
電極１０の上下両面に圧電素子１１，１２を接着
したバイモルフ形であり、圧電素子１１とキヤビ
ネツト本体１との間は圧電素子の中央部に設けた
金属または高分子等の高剛性材料より成るスペー
サ７によつてギヤツプｄを保つて強固に固着保持
する。ここで、圧電素子の振動モードを第７図に
示す。第７図において、は第１次共振における
振動モードで、振動板上に生じる節円は１つであ
る。は第２次共振における振動モードで節円は
２つである。は第３次共振における振動モード
で節円は３つである。振動素子に生じる共振は周
波数が高くなるに従つて高次なものとなり、その
振動モードにより発生する節円の数も増えてく
る。従来の方式では圧電素子の片側全面をキヤビ
ネツトに固着するため上記の振動モードは抑制さ
れてしまうものであつた。本発明においては圧電
素子の中央部を固着支持するため、圧電素子の屈
曲振動は容易なものとなる。またスピーカ装置と
しての再生帯域と圧電素子の共振周波数との関係
を見るならば、高域限界周波数は圧電素子の第３
次以上の共振周波数となつているのが一般的であ
る。従つて、圧電素子を支持するスペーサ７の外
径は第７図の振動モード図からも明らかなよう
に、出来るだけ小さい方が望ましい。しかし接着
強度を考えるときある程度の大きさが必要であ
り、高域限界を第３次とすればその振動モードか
らスペーサの外径は振動板外径の1/5以下に選ぶ
必要がある。DESCRIPTION OF EMBODIMENTS FIG. 3 shows a structural sectional view of a speaker device according to a first embodiment of the present invention incorporated into a radio set. In the figure, the same components as those of the conventional example shown in FIGS. 1 and 2 are given the same numbers. In FIG. 3, the piezoelectric element 2 is held with a gap d between it and the cabinet body 1. FIG. 4 shows details of the connection between the piezoelectric element and the cabinet. In FIG. 4, the piezoelectric element is a bimorph type in which piezoelectric elements 11 and 12 are bonded to the upper and lower surfaces of a metal intermediate electrode 10, and a metal layer provided in the center of the piezoelectric element is located between the piezoelectric element 11 and the cabinet body 1. Alternatively, the gap d is maintained and firmly fixed by a spacer 7 made of a highly rigid material such as a polymer. Here, the vibration mode of the piezoelectric element is shown in FIG. In FIG. 7, is the vibration mode in the first resonance, and there is one nodal circle generated on the diaphragm. is the vibration mode in the second resonance, and there are two nodal circles. is the vibration mode in the third resonance, and there are three nodal circles. As the frequency becomes higher, the resonance generated in the vibrating element becomes higher-order, and the number of nodal circles generated by the vibration mode also increases. In the conventional method, the entire surface of one side of the piezoelectric element is fixed to the cabinet, so that the above-mentioned vibration mode is suppressed. In the present invention, since the center portion of the piezoelectric element is firmly supported, bending vibration of the piezoelectric element becomes easy. Also, if we look at the relationship between the reproduction band as a speaker device and the resonant frequency of the piezoelectric element, the high-frequency limit frequency is the 3rd frequency of the piezoelectric element.
Generally, the resonance frequency is equal to or higher than the following. Therefore, as is clear from the vibration mode diagram in FIG. 7, it is desirable that the outer diameter of the spacer 7 supporting the piezoelectric element be as small as possible. However, when considering adhesive strength, a certain size is required, and if the high frequency limit is set to third order, the outer diameter of the spacer needs to be selected to be 1/5 or less of the outer diameter of the diaphragm based on the vibration mode.
以上のように構成された本実施例のスピーカ装
置について、以下その動作を説明する。 The operation of the speaker device of this embodiment configured as described above will be described below.
リード線５を介して圧電素子１１，１２及び中
間電極１０に電気信号を印加すると、屈曲振動を
伴なう駆動力が生じ、この駆動力によりスペーサ
７を介してキヤビネツト本体１が振動する。この
振動が音響出力となつて空気中に放射されるもの
である。 When an electric signal is applied to the piezoelectric elements 11, 12 and the intermediate electrode 10 via the lead wires 5, a driving force accompanied by bending vibration is generated, and this driving force causes the cabinet body 1 to vibrate via the spacer 7. This vibration becomes acoustic output and is radiated into the air.
以上のように本実施例によれば、圧電素子の中
央をスペーサにより支持し、キヤビネツト本体と
結合固着するため、圧電素子の周辺は自由端とな
り、従来方式のように振動モードが抑制されるこ
とがないものである。そのため、低音域からの再
生が可能となり、広帯域なスピーカ装置が実現で
きる。 As described above, according to this embodiment, the center of the piezoelectric element is supported by a spacer and is fixedly connected to the cabinet body, so the periphery of the piezoelectric element becomes a free end, and the vibration mode is suppressed unlike the conventional method. There is no such thing. Therefore, it is possible to reproduce from the low frequency range, and a wideband speaker device can be realized.
次に本発明の第２の実施例について図面を参照
しながら説明する。 Next, a second embodiment of the present invention will be described with reference to the drawings.
第５図は本発明の第２の実施例を示すスピーカ
装置の圧電素子とキヤビネツト取付け部の詳細図
である。 FIG. 5 is a detailed view of a piezoelectric element and a cabinet mounting portion of a speaker device showing a second embodiment of the present invention.
同図において、１１，１２は圧電素子、１０は
中間電極、１１はキヤビネツト本体、５はリード
線で、これらは第４図の構成と同様である。第４
図と異なるのは、スペーサ８をコーン状に成型し
た点である。 In the figure, 11 and 12 are piezoelectric elements, 10 is an intermediate electrode, 11 is a cabinet body, and 5 is a lead wire, which are similar to the structure shown in FIG. 4. Fourth
The difference from the figure is that the spacer 8 is molded into a cone shape.
上記のように構成された第２の実施例によれ
ば、圧電素子側のスペーサ径は小さく、キヤビネ
ツトとの接合径は大きく取ることができるため、
圧電素子の振動モードを抑制することなくスペー
サとキヤビネツト間の接着強度を上げることが可
能となり、圧電素子をより安定に保持することが
できる。 According to the second embodiment configured as described above, the spacer diameter on the piezoelectric element side is small, and the joining diameter with the cabinet can be made large.
It becomes possible to increase the adhesive strength between the spacer and the cabinet without suppressing the vibration mode of the piezoelectric element, and the piezoelectric element can be held more stably.
第６図は本発明の第３の実施例を示す。 FIG. 6 shows a third embodiment of the invention.
同図において、１１，１２は圧電素子、１０は
中間電極、１はキヤビネツト本体、５はリード線
で、これらは上記実施例の構成と同様である。こ
の実施例ではスペーサ９をキヤビネツト本体１と
一体とした点である。 In the figure, 11 and 12 are piezoelectric elements, 10 is an intermediate electrode, 1 is a cabinet body, and 5 is a lead wire, which are the same as those in the above embodiment. In this embodiment, the spacer 9 is integrated with the cabinet body 1.
上記のような構成とすれば、圧電素子とキヤビ
ネツト間のスペーサ部品が不要となり、接着も圧
電素子とスペーサ間のみとなる。 With the above configuration, there is no need for a spacer component between the piezoelectric element and the cabinet, and bonding is only required between the piezoelectric element and the spacer.
上記実施例においては圧電素子２の形状は円形
としたが、角形としてもよい。 In the above embodiment, the shape of the piezoelectric element 2 is circular, but it may be square.
発明の効果
キヤビネツト内に内蔵した圧電素子の中央部を
一端で固着支持し、間隔を保つて他端で前記キヤ
ビネツト内面の一部と結合固着したスペーサを設
けて前記圧電素子の外周を自由端となるようにし
たことにより、圧電素子の振動モードが抑制され
ることなく屈曲振動が容易になるため、きわめて
簡単な構成で従来のキヤビネツト直接駆動型スピ
ーカの再生帯域より広い低音域からの再生を可能
にした、薄型で広帯域のスピーカ装置を実現でき
るものである。Effects of the Invention The center part of the piezoelectric element housed in the cabinet is fixedly supported at one end, and a spacer is provided which is fixedly connected to a part of the inner surface of the cabinet at the other end while maintaining a distance, so that the outer periphery of the piezoelectric element is set as a free end. As a result, the vibration mode of the piezoelectric element is not suppressed and bending vibration is facilitated, making it possible to reproduce a bass range wider than the reproduction band of conventional cabinet-direct-drive speakers with an extremely simple configuration. This makes it possible to realize a thin, wide-band speaker device.
第１図は従来のスピーカ装置を塔載したラジオ
セツトの外観図、第２図は同セツトの構造断面
図、第３図は本発明の第１の実施例のスピーカ装
置を塔載したラジオセツトの構造断面図、第４図
は同スピーカ装置の取り付け部の詳細図、第５図
は本発明の第２の実施例におけるスピーカ装置の
取り付け部の詳細図、第６図は本発明の第３の実
施例の詳細図、第７図は圧電素子の振動モード図
である。
１……キヤビネツト本体、２……圧電素子、
７，８，９……スペーサ、５……リード線、１
１，１２……圧電素子、１０……中間電極。
FIG. 1 is an external view of a radio set equipped with a conventional speaker device, FIG. 2 is a structural cross-sectional view of the same set, and FIG. 3 is a radio set equipped with a speaker device according to the first embodiment of the present invention. FIG. 4 is a detailed view of the mounting portion of the speaker device according to the second embodiment of the present invention, FIG. 5 is a detailed view of the mounting portion of the speaker device according to the second embodiment of the present invention, and FIG. FIG. 7 is a detailed view of the embodiment, and FIG. 7 is a vibration mode diagram of the piezoelectric element. 1... Cabinet body, 2... Piezoelectric element,
7, 8, 9... Spacer, 5... Lead wire, 1
1, 12... piezoelectric element, 10... intermediate electrode.
Claims (1)
カ装置であつて、一端で前記圧電素子の中央部を
固着支持し、間隔を保つて他端で前記キヤビネツ
ト内面の一部と結合固着し、少なくとも前記圧電
素子との固着支持面が前記圧電素子の外径の1/5
以下となるスペーサを設けて前記圧電素子の外周
を自由端となるようになし、前記圧電素子によつ
てキヤビネツトを振動させることを特徴とするス
ピーカ装置。1 A speaker device having a piezoelectric element built into the cabinet, wherein one end firmly supports the center part of the piezoelectric element, and the other end is fixedly connected to a part of the inner surface of the cabinet while maintaining a distance, and at least the piezoelectric element The fixed support surface of the piezoelectric element is 1/5 of the outer diameter of the piezoelectric element.
A speaker device characterized in that a spacer as described below is provided so that the outer periphery of the piezoelectric element becomes a free end, and the piezoelectric element vibrates a cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15208683A JPS6044000A (en) | 1983-08-20 | 1983-08-20 | Loudspeaker device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15208683A JPS6044000A (en) | 1983-08-20 | 1983-08-20 | Loudspeaker device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6044000A JPS6044000A (en) | 1985-03-08 |
| JPH053800B2 true JPH053800B2 (en) | 1993-01-18 |
Family
ID=15532737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15208683A Granted JPS6044000A (en) | 1983-08-20 | 1983-08-20 | Loudspeaker device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6044000A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6324343B2 (en) * | 2015-04-08 | 2018-05-16 | キヤノン株式会社 | Imaging apparatus and camera |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53136386A (en) * | 1977-04-30 | 1978-11-28 | Matsushita Electric Works Ltd | Microphone for blood pressure hemodynamometer |
| JPS55147900A (en) * | 1979-05-08 | 1980-11-18 | Kuwata Momoyo | Ultra-thin speaker |
| JPS5734698B2 (en) * | 1976-11-12 | 1982-07-24 | ||
| JPS58105700A (en) * | 1981-12-18 | 1983-06-23 | Matsushita Electric Ind Co Ltd | Piezo-electric type loudspeaker |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55175198U (en) * | 1979-06-05 | 1980-12-16 | ||
| JPS6024056Y2 (en) * | 1980-07-29 | 1985-07-17 | 三洋電機株式会社 | piezoelectric speaker |
| JPS57119997U (en) * | 1981-01-20 | 1982-07-26 | ||
| JPS6024051Y2 (en) * | 1981-02-26 | 1985-07-17 | オンキヨー株式会社 | piezoelectric vibrator |
-
1983
- 1983-08-20 JP JP15208683A patent/JPS6044000A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5734698B2 (en) * | 1976-11-12 | 1982-07-24 | ||
| JPS53136386A (en) * | 1977-04-30 | 1978-11-28 | Matsushita Electric Works Ltd | Microphone for blood pressure hemodynamometer |
| JPS55147900A (en) * | 1979-05-08 | 1980-11-18 | Kuwata Momoyo | Ultra-thin speaker |
| JPS58105700A (en) * | 1981-12-18 | 1983-06-23 | Matsushita Electric Ind Co Ltd | Piezo-electric type loudspeaker |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6044000A (en) | 1985-03-08 |
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