JPS5856318B2 - piezoelectric speaker - Google Patents
piezoelectric speakerInfo
- Publication number
- JPS5856318B2 JPS5856318B2 JP17337380A JP17337380A JPS5856318B2 JP S5856318 B2 JPS5856318 B2 JP S5856318B2 JP 17337380 A JP17337380 A JP 17337380A JP 17337380 A JP17337380 A JP 17337380A JP S5856318 B2 JPS5856318 B2 JP S5856318B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric
- vibrator
- vibration
- auxiliary
- vibrating
- 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
Links
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 230000000694 effects Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229910052573 porcelain Inorganic materials 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】
この発明は、圧電振動子を使用した発音体に係り、振動
子の形状を特定し再生周波数特性を改善した圧電スピー
カに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sounding body using a piezoelectric vibrator, and more particularly to a piezoelectric speaker in which the shape of the vibrator is specified and reproduction frequency characteristics are improved.
近年、ラジオ、テープレコーダ等の音響機器が小形化さ
れるにともない、小形のスピーカとして、薄形並びに低
消費電力を特徴とする圧電スピーカが検討されている。In recent years, as audio equipment such as radios and tape recorders have become smaller, piezoelectric speakers, which are thin and feature low power consumption, are being considered as compact speakers.
しかし、圧電スピーカは駆動源たる圧電振動子の機械共
振を利用するため、音響出力の周波数特性が平坦でなく
、いまだ実用化されるにいたっていない。However, since piezoelectric speakers utilize the mechanical resonance of a piezoelectric vibrator as a driving source, the frequency characteristics of the acoustic output are not flat, so they have not yet been put into practical use.
この発明は、上述の点に鑑み、実用化に適した圧電スピ
ーカを提供するもので、片持ち梁構成の圧電振動子にお
いて、その振動先端側に、金属板部分の幅を主振動部の
幅に対し不連続的に狭くして補助振動部とし、ここに振
動板を結合させた構成からなる圧電スピーカである。In view of the above-mentioned points, the present invention provides a piezoelectric speaker suitable for practical use.In a piezoelectric vibrator having a cantilever structure, the width of the metal plate part is set to the width of the main vibrating part on the vibrating tip side of the piezoelectric vibrator. This is a piezoelectric speaker consisting of a auxiliary vibration section that is discontinuously narrowed, and a diaphragm is connected to the auxiliary vibration section.
ここで片持ち梁構成の圧電振動子について従来の代表的
な形状を説明すると、短冊状の金属板にこれと相似形の
圧電板を貼着し、金属板の一方端を固定して他端を振動
先端部とした構成であり、振動先端部に例えばコーン紙
の中心を結合して圧電スピーカに組立てるものである。Here, to explain the conventional typical shape of a piezoelectric vibrator with a cantilever configuration, a piezoelectric plate of a similar shape is attached to a rectangular metal plate, one end of the metal plate is fixed, and the other end is The piezoelectric speaker has a structure in which the vibrating tip is connected to the center of a paper cone, for example, and assembled into a piezoelectric speaker.
次に、この発明による圧電振動子とスピーカについて、
具体的な一例を図面に基づいて説明する。Next, regarding the piezoelectric vibrator and speaker according to the present invention,
A specific example will be explained based on the drawings.
まず、圧電振動子は半円形の円周部分に矩形を接続した
金属板1に、半円形の圧電板2を複合し、接続した矩形
部分を固定側とし、さらに金属板1の振動先端側の直線
部分中央に矩形の金属板を突設して補助振動部3として
いる。First, the piezoelectric vibrator is made by combining a semicircular piezoelectric plate 2 with a metal plate 1 in which a rectangular part is connected to the semicircular circumferential part, and the connected rectangular part is the fixed side, and the vibrating tip side of the metal plate 1 is A rectangular metal plate is provided protruding from the center of the straight line portion to serve as an auxiliary vibration section 3.
スピーカに組立てるには、固定側の矩形部分を例えばス
ピーカケースの支持台4に固着し、例えばコーン形の振
動板5の中心点と補助振動部3とを結合しく結合点は図
中に黒丸点で示す)、振動板5の円周端をスピーカケー
スの開口円周部6に固定して仕上げる。To assemble the speaker, the rectangular part on the fixed side is fixed to, for example, the support base 4 of the speaker case, and the center point of the cone-shaped diaphragm 5 and the auxiliary vibration part 3 are connected. ), the circumferential end of the diaphragm 5 is fixed to the opening circumferential portion 6 of the speaker case.
このように構成することにより、金属板1の半円形部分
が、振動板を圧電的に振動させる駆動源となる主振動部
となり、補助振動部3はこの主振動部に対して幅方向の
寸法を不連続的に狭くすることにより、補助振動子3上
に設けたこの振動子と振動板5との結合点に振動節が移
動してくるのを防ぐ機能を有しており、スピーカに組立
てた際の再生音の周波数特性が平坦化される。With this configuration, the semicircular part of the metal plate 1 becomes the main vibrating part that serves as a drive source for piezoelectrically vibrating the diaphragm, and the auxiliary vibrating part 3 has a widthwise dimension relative to the main vibrating part. By narrowing discontinuously, it has the function of preventing the vibration node from moving to the connection point between this vibrator and the diaphragm 5 provided on the auxiliary vibrator 3. The frequency characteristics of the reproduced sound are flattened.
さらに詳述するために振動子の振動モードを例に説明す
る。For further details, the vibration mode of the vibrator will be explained as an example.
第2図には、上述したこの発明による振動子の形状にお
いて、補助振動部3を除去した半円形の主振動部のみか
らなる比較のための振動子を示している。FIG. 2 shows a vibrator for comparison consisting of only a semicircular main vibrating section with the auxiliary vibrating section 3 removed from the vibrator according to the present invention described above.
上記の振動子を用いた場合、高次の共振の際に、例えば
図中に破線で振動の節位置を示すような振動モード(下
達する実施例において明らかにする如<16KHzの振
動)で励振されたとき、通常振動子の振動側先端部、す
なわちここでは半円形の直線部分上の圧電板2と振動板
5とを結合するが、図中に黒丸点で結合点を示すように
振動節位置上あるいは近くに結合点が位置するため、振
動は振動板5に伝達されず音響出力に鋭い谷を生じる。When the above-mentioned vibrator is used, when high-order resonance occurs, it is excited in a vibration mode (vibration <16 kHz, as will be made clear in the following example), for example, as shown in the figure with the nodal position of vibration indicated by a broken line. When this happens, the piezoelectric plate 2 and the diaphragm 5 on the vibrating side tip of the vibrator, that is, the semicircular straight part in this case are usually connected, but the vibration node is Since the coupling point is located on or near the position, the vibration is not transmitted to the diaphragm 5, resulting in a sharp valley in the acoustic output.
また、共振をはずれた周波数においても、低次モードか
ら高次の振動モードに移行する際に、その接点が結合点
部分に移動するため、上記の場合と同様に音響出力に鋭
い谷を生じる。Furthermore, even at frequencies that are off resonance, when the vibration mode shifts from a low-order mode to a high-order vibration mode, the contact point moves to the coupling point, resulting in a sharp valley in the acoustic output, similar to the case described above.
これに対して、この発明の振動子では、振動板5との結
合点がある振動先端部すなわち補助振動部3の幅方向の
寸法(W2)が、振動子の長さく4)方向に不連続的に
変化しているため、第1図中に第2図と同様の振動モー
ドの振動節位置を破線で示しているが、高次の共振の際
に振動節は補助振動部3に移動することがない。In contrast, in the vibrator of the present invention, the widthwise dimension (W2) of the vibrating tip portion where the connection point with the vibrating plate 5 is located, that is, the auxiliary vibrating portion 3, is discontinuous in the vibrator length direction (4). The vibration node position in the same vibration mode as in Figure 2 is shown with a broken line in Figure 1, but the vibration node moves to the auxiliary vibration part 3 during high-order resonance. Never.
従って振動板5との結合点(図中の黒丸点)には振動節
点が発生しないため、音響出力に谷を生ずることなく、
周波数特性が平坦化されるのである。Therefore, no vibration nodes are generated at the connection point with the diaphragm 5 (black dots in the figure), so there is no valley in the acoustic output.
The frequency characteristics are flattened.
この発明の要旨は、振動子の幅(Wl)方向の寸法を振
動先端側に向って長さく至)方向に不連続的に狭くする
構成により、振動節位置を振動板と振動子との結合点に
移動させないことにある。The gist of this invention is to reduce the vibration node position by coupling the diaphragm and the oscillator by a configuration in which the width (Wl) dimension of the oscillator is discontinuously narrowed in the length direction toward the vibrating tip side. The point is not to move it to a point.
従って振動子の主振動幅(Wl)に対する補助振動部幅
(W2)が重要となり、w2/W1の寸法比カニ/3以
下であることが必要であり、この範囲を超える幅寸法の
補助振動部には上記した節点が生じてしまい、周波数特
性の平坦化の効果が低減する。Therefore, the width of the auxiliary vibration part (W2) with respect to the main vibration width (Wl) of the vibrator is important, and the dimension ratio of w2/W1 must be less than /3, and the width of the auxiliary vibration part exceeds this range. The above-mentioned nodes occur, and the effect of flattening the frequency characteristics is reduced.
また、この発明の効果は上述した如く補助振動部幅を振
動子の長さ方向に不連続的に変化させることによって得
られているため、振動子における主振動部の形状は任意
の形状のものでよい。Furthermore, since the effects of the present invention are obtained by discontinuously changing the width of the auxiliary vibrating part in the length direction of the vibrator as described above, the main vibrating part of the vibrator can have an arbitrary shape. That's fine.
例えば第1図に示した半円形状のものや第3図のa図に
示す六角形のように、固定側幅に対して振動側の主振動
部幅を広くとり、幅方向における最低共振勢力を増大さ
せて低域における音響出力の向上を図った構成とするの
もよい。For example, like the semicircular shape shown in Figure 1 or the hexagonal shape shown in Figure 3 a, the width of the main vibrating part on the vibration side is made wider than the fixed side width, and the minimum resonance force in the width direction is It is also possible to adopt a configuration in which the acoustic output in the low frequency range is improved by increasing the .
また第3図のb図に示すように従来の矩形とした振動子
にこの発明による補助振動部を構成するのもよい。Further, as shown in FIG. 3B, the auxiliary vibration section according to the present invention may be constructed in a conventional rectangular vibrator.
特に、第3図のC図に示すように、主振動部の先端内に
補助振動部3を形成することにより、主振動部の有効長
さを大きく取れるため、スピーカの再生音の下限周波数
を低くすることができる。In particular, as shown in Fig. 3C, by forming the auxiliary vibration section 3 within the tip of the main vibration section, the effective length of the main vibration section can be increased, so that the lower limit frequency of the sound reproduced by the speaker can be increased. It can be lowered.
なお、圧電振動子の基本構成について、上述の圧電板を
金属板の片側にのみ接着したいわゆる非対称形振動子の
ほか両面に接着した対称形振動子であっても同等の効果
が得られることはいうまでもないことである。Regarding the basic structure of the piezoelectric vibrator, it is possible to obtain the same effect with the so-called asymmetric vibrator in which the piezoelectric plate is bonded to only one side of the metal plate, as well as in the symmetrical vibrator in which the piezoelectric plate is bonded to both sides. It goes without saying.
以下にこの発明による実施例を示しその効果を明らかに
する。Examples according to the present invention will be shown below to clarify its effects.
ここでは第1図に示した主振動部が半円形の圧電振動子
の場合を説明する。Here, a case will be explained in which the main vibrating section shown in FIG. 1 is a semicircular piezoelectric vibrator.
金属板1には、機械的Q値の低い厚み0.15mmの鉄
クロム系金属材料を使用し、主振動部の形状を半径13
mmの半円形、補助振動部3を幅2關、長さ3關とし、
支持台4への固定部分を幅]Omm、長さ3mmに成形
し、その上にジルコン・チタン酸鉛系磁器からなる半径
13mmの半円形の圧電板2を接着して圧電振動子に作
製した。For the metal plate 1, an iron-chromium metal material with a thickness of 0.15 mm and a low mechanical Q value is used, and the shape of the main vibration part is set to a radius of 13 mm.
mm semicircle, the auxiliary vibration part 3 has a width of 2 mm and a length of 3 mm,
The part fixed to the support base 4 was formed to have a width of 0 mm and a length of 3 mm, and a semicircular piezoelectric plate 2 with a radius of 13 mm made of zircon-lead titanate porcelain was adhered thereon to produce a piezoelectric vibrator. .
次に振動板5には、厚さ75μmのポリイミドフィルム
を成型した直径25mmのコーン形振動板を使用し、コ
ーン形の中心点を補助振動部に接着し、振動板5の円周
部はスピーカーフレームの開口部6に接着剤で固定して
圧電スピーカに仕上げた。Next, for the diaphragm 5, a cone-shaped diaphragm with a diameter of 25 mm made of a polyimide film with a thickness of 75 μm is used.The center point of the cone shape is glued to the auxiliary vibration part, and the circumferential part of the diaphragm 5 is attached to the speaker. It was fixed to the opening 6 of the frame with adhesive to create a piezoelectric speaker.
次に、比較のために第2図に示すような補助振動部のな
いほぼ半円形の振動子を使用して上記と同様な圧電スピ
ーカに組立てた。Next, for comparison, a substantially semicircular vibrator without an auxiliary vibrating part as shown in FIG. 2 was used and assembled into a piezoelectric speaker similar to the above.
なお作製にあたっては、上記のこの発明による振動子を
用い、その補助振動部を切り落した振動子を使用した。In manufacturing, the above-mentioned vibrator according to the present invention was used, with the auxiliary vibrating part cut off.
以上に示した2種のスピーカに実効値1■の交番電圧を
加えて軸上10Cr/Lにおける音圧レベルを測定した
。An alternating voltage with an effective value of 1 .mu.m was applied to the two types of speakers shown above, and the sound pressure level at an on-axis position of 10 Cr/L was measured.
補助振動部のない比較のための振動子を用いたスピーカ
の周波数特性を第4図に示し、この発明によるスピーカ
の場合を第5図に示す。FIG. 4 shows the frequency characteristics of a speaker using a vibrator for comparison without an auxiliary vibrating section, and FIG. 5 shows the frequency characteristics of a speaker according to the present invention.
第4図から明らかな如く、比較例の場合約8KHz、1
1KHz、16KHzにおいて音圧レベルが大きく落ち
込み、鋭い谷が生じている。As is clear from Figure 4, in the case of the comparative example, the frequency was approximately 8kHz, 1
The sound pressure level drops significantly at 1 KHz and 16 KHz, and a sharp valley appears.
これに対して、主振動部が同等であっても補助振動部を
有するこの発明による振動子を用いた場合には、音圧レ
ベルの落ち込みが発生せず平坦な周波数特性を示してい
る。On the other hand, when a vibrator according to the present invention having an auxiliary vibrating section is used even if the main vibrating section is the same, the sound pressure level does not drop and exhibits flat frequency characteristics.
これは、前述した如く主振動部上の振動節点が振動板と
の結合点すなわち補助振動部に移動できないためである
。This is because, as described above, the vibration node on the main vibration section cannot move to the connection point with the diaphragm, that is, to the auxiliary vibration section.
ちなみに第1図、第2図の破線で示す振動節位置は16
KL!zの振動に対応するものである。By the way, the vibration node position indicated by the broken line in Figures 1 and 2 is 16.
KL! This corresponds to the vibration of z.
以上の実施例からも明らかなように、この発明による圧
電振動子を用いたスピーカは、1つのスピーカユニット
で広帯域の再生が可能であり、実用上程々の用途に使用
できるすぐれた広帯域圧電スピーカである。As is clear from the above embodiments, the speaker using the piezoelectric vibrator according to the present invention is capable of reproducing a wide band with one speaker unit, and is an excellent wide band piezoelectric speaker that can be used for moderate practical purposes. be.
第1図はこの発明による圧電スピーカの縦断面図と振動
子の平面図、第2図は比較のための圧電スピーカの縦断
面図と振動子の平面図、第3図はこの発明による圧電振
動子の他の実施例を示す平面図、第4図は実施例におけ
る比較のための圧電スピーカの周波数特性を示す図表、
第5図は実施例におけるこの発明によるスピーカの周波
数特性を示す図表である。
図中1・・・・・・金属板、2・・・・・・圧電板、3
・・・・・・補助振動部、4・・・・・・支持台、5・
・・・・・振動板、6・・・・・・開口円周部。FIG. 1 is a vertical cross-sectional view of a piezoelectric speaker according to the present invention and a plan view of a vibrator, FIG. 2 is a vertical cross-sectional view of a piezoelectric speaker and a plan view of a vibrator for comparison, and FIG. 3 is a piezoelectric vibration according to the present invention. FIG. 4 is a diagram showing the frequency characteristics of the piezoelectric speaker for comparison in the example;
FIG. 5 is a chart showing the frequency characteristics of a speaker according to the present invention in an example. In the figure 1...Metal plate, 2...Piezoelectric plate, 3
...Auxiliary vibration section, 4...Support stand, 5.
...Diaphragm, 6...Aperture circumference.
Claims (1)
した圧電振動子を駆動源とし、その振動先端側に主振動
部の幅に対して1/3以下の幅寸法の補助振動部を設け
、補助振動部に振動板を結合した圧電スピーカ。1 A piezoelectric vibrator made by combining a piezoelectric plate with a metal plate and fixing one end of the metal plate is used as a drive source, and an auxiliary vibrating part with a width dimension of 1/3 or less of the width of the main vibrating part is provided on the vibrating tip side. A piezoelectric speaker with a diaphragm coupled to the auxiliary vibration part.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17337380A JPS5856318B2 (en) | 1980-12-08 | 1980-12-08 | piezoelectric speaker |
US06/314,873 US4454386A (en) | 1980-10-29 | 1981-10-26 | Piezoelectric transducer for piezoelectric loud speaker |
DE3143027A DE3143027C2 (en) | 1980-10-29 | 1981-10-29 | Piezoelectric converter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17337380A JPS5856318B2 (en) | 1980-12-08 | 1980-12-08 | piezoelectric speaker |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5797298A JPS5797298A (en) | 1982-06-16 |
JPS5856318B2 true JPS5856318B2 (en) | 1983-12-14 |
Family
ID=15959182
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17337380A Expired JPS5856318B2 (en) | 1980-10-29 | 1980-12-08 | piezoelectric speaker |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5856318B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3044158B1 (en) * | 2015-11-19 | 2017-11-17 | Soc Technique Pour L'energie Atomique | ASSEMBLY OF ELECTRIC PENETRATION OF TANK OF A NUCLEAR REACTOR |
-
1980
- 1980-12-08 JP JP17337380A patent/JPS5856318B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5797298A (en) | 1982-06-16 |
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