JPS5948600B2 - piezoelectric speaker - Google Patents
piezoelectric speakerInfo
- Publication number
- JPS5948600B2 JPS5948600B2 JP17442580A JP17442580A JPS5948600B2 JP S5948600 B2 JPS5948600 B2 JP S5948600B2 JP 17442580 A JP17442580 A JP 17442580A JP 17442580 A JP17442580 A JP 17442580A JP S5948600 B2 JPS5948600 B2 JP S5948600B2
- Authority
- JP
- Japan
- Prior art keywords
- vibrator
- piezoelectric
- piezoelectric speaker
- plate
- speaker
- 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
- 239000002184 metal Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005452 bending Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- NKZSPGSOXYXWQA-UHFFFAOYSA-N dioxido(oxo)titanium;lead(2+) Chemical compound [Pb+2].[O-][Ti]([O-])=O NKZSPGSOXYXWQA-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 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
Description
【発明の詳細な説明】
この発明は、片持ち構成とした圧電バイモルフ振動子を
駆動源とする圧電スピーカに係り、実用的な音域幅にお
ける周波数特性の平坦化を図った圧電スピーカに関する
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric speaker using a cantilevered piezoelectric bimorph vibrator as a driving source, and more particularly, to a piezoelectric speaker whose frequency characteristics are flattened in a practical range width.
圧電スピーカは、近年、メロディ−１合成音声等の発音
用電子回路がＩＣ化されるにともない、薄形化、低消費
電力化が可能な発音体として、その実用化が切望されて
いる。In recent years, as electronic circuits for producing sounds such as melody-1 synthesized voices have been integrated into ICs, piezoelectric speakers have been desired to be put to practical use as sounding bodies that can be made thinner and have lower power consumption.
圧電スピーカの一般的な機構は、金属板に圧電板を複合
した圧電振動子の一方端を固定し、他方の先端に振動板
を結合し、振動子の屈曲振動を振動板のピストン運動に
変換して音響出力を得るものである。The general mechanism of a piezoelectric speaker is to fix one end of a piezoelectric vibrator, which is a composite of a piezoelectric plate on a metal plate, and connect a diaphragm to the other end, converting the bending vibration of the vibrator into piston motion of the diaphragm. to obtain acoustic output.
しかし、上記の片持ち構成の振動子を駆動源とする場合
、振動損失の少ない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鋭い山谷を生じることが知ら
れており、また低域の再生能力が劣るものであった。However, when using the above-mentioned cantilevered vibrator as a drive source, it is known that the frequency characteristics of the acoustic output are not flat and have sharp peaks and valleys because mechanical resonance with low vibration loss is used. The regeneration ability of the area was poor.
これに対して、出願人は特願昭５５−１５２６１８にお
いて、振動子の幅方向の寸法を広げて、長さ方向の屈曲
振動ばかりでなく、幅方向における振動を利用して、低
域の出力を向上させ再生音の周波数特性を平坦化した圧
電スピーカを提案した。On the other hand, in Japanese Patent Application No. 55-152618, the applicant widened the width dimension of the vibrator to utilize not only the bending vibration in the length direction but also the vibration in the width direction, thereby producing low-frequency output. We have proposed a piezoelectric speaker that improves the frequency characteristics of reproduced sound and flattens the frequency characteristics of the reproduced sound.
この発明は、広帯域かつ平坦な周波数特性を有する圧電
スピーカを目的とするものであり、上記した圧電振動子
を改良し、さらに周波数特性の平坦化を図ったものであ
る。The present invention aims at a piezoelectric speaker having a wide band and flat frequency characteristics, and is an improvement of the piezoelectric vibrator described above, and further flattens the frequency characteristics.
すなわち、この発明は、片持ち構成の圧電振動子の長さ
寸法（７）と幅寸法（５）との関係をＷ／ｎ＝０．７５
〜３とし、長さ方向の中心軸に対して圧電振動子の形状
を非対称形となした振動子を駆動源とする圧電スピーカ
である。That is, in the present invention, the relationship between the length dimension (7) and the width dimension (5) of a piezoelectric vibrator having a cantilevered structure is determined as W/n=0.75.
This is a piezoelectric speaker whose drive source is a piezoelectric vibrator whose shape is asymmetrical with respect to the central axis in the longitudinal direction.
換言すれば、この発明は、圧電振動子の形状を長さ方向
の中心軸に対して非対称とする点を要旨とする。In other words, the gist of the present invention is to make the shape of the piezoelectric vibrator asymmetrical with respect to the central axis in the longitudinal direction.
次に、この発明を具体的な１例をもって説明すると、第
１図に示す如く、ここでは振動子１の金属板２ははゾ卓
球のラケット状であり、円形の圧電板３をその中央に複
合し、金属板２の幅の狭い側を支持台４に固定し、幅の
広い側を振動先端部とし、さらにその一部を切欠き振動
子の形状を長さ方向の中心軸に対して非対称に構成して
いる。Next, to explain this invention using a specific example, as shown in FIG. The narrow side of the metal plate 2 is fixed to the support base 4, the wide side is used as the vibrating tip, and a part of it is cut out so that the shape of the vibrator is adjusted relative to the central axis in the longitudinal direction. It is structured asymmetrically.
このように振動子を非対称に構成することにより、対称
形のときに縮退されていた振動モードを分離させ、共振
点を増加させることができ、振動子１の先端に振動板５
を結合したスピーカにおいて、周波数特性が実質的に平
坦化されるのである。By configuring the vibrator asymmetrically in this way, it is possible to separate the vibration modes that were degenerated in the case of a symmetrical type and increase the number of resonance points.
In a speaker that combines the two, the frequency characteristics are substantially flattened.
すなわち、上記の効果は、非対称モードを発生させるこ
とにより得られているため、振動子の金属板部の形状を
長さ方向の中心軸に対して非対称とする手段の他に第１
図に示す如く、上記のラケット状の金属板２ａへ接着す
る圧電板３の複合位置を中心軸に対してずらし、非対称
としても同等の効果が得られる。That is, since the above effect is obtained by generating an asymmetric mode, in addition to making the shape of the metal plate part of the vibrator asymmetric with respect to the central axis in the longitudinal direction, the first method is used.
As shown in the figure, the same effect can be obtained even if the composite position of the piezoelectric plate 3 bonded to the racket-shaped metal plate 2a is shifted with respect to the central axis to be asymmetrical.
さらに圧電板３の形状を中心軸に対して非対称としても
同等である。Furthermore, the same result can be achieved even if the shape of the piezoelectric plate 3 is asymmetrical with respect to the central axis.
この発明における振動子の非対称化による共振点の分離
は、対称形とした場合に生じていた共振点近傍に分離さ
せるものであり、一般的な従来の矩形の振動子の如く元
来共振点が大きく離れているような場合にはその効果は
十分に発揮されない。The separation of the resonance point by making the vibrator asymmetric in this invention is to separate the resonance point in the vicinity of the resonance point that would have occurred if the vibrator was made symmetrical, and the resonance point was originally separated as in a general conventional rectangular vibrator. If they are far apart, the effect will not be fully demonstrated.
ところが、固定側に対して振動先端側の幅を広くとり、
幅方向における振動を積極的に利用した振動子において
、特に振動子の幅寸法（５）を長さ寸法（Ａ）で除した
寸法比（Ｗ／ｌｊ ）を０．７５〜３とし、その再生帯
域内に共振点をふやした振動子では、非対称化により共
振点の分離の効果は特に著しく有効になる。However, by making the vibrating tip side wider than the fixed side,
In a vibrator that actively utilizes vibration in the width direction, the dimension ratio (W/lj), which is the width dimension (5) of the vibrator divided by its length dimension (A), is set to 0.75 to 3, and its regeneration is In a vibrator in which the number of resonance points is increased within the band, the effect of separating the resonance points becomes particularly effective due to the asymmetry.
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.
実施例では、発明による効果を明確にするため、上記の
幅を広げた振動子を用いて比較した。In the example, in order to clarify the effects of the invention, a comparison was made using a vibrator with the above-mentioned wider width.
すなわち上述の卓球のラケット状の振動子とした。In other words, the above-mentioned table tennis racket-shaped vibrator was used.
金属板には０．１５１１Ｌ１１Ｌのリン青銅板を使用し
、幅２４酊固定部幅１０１１！−固定部を除く有効長を
１３１ｍのラケット状に成形し、その片面にジルコン、
チタン酸鉛系磁器からなる直径１４ｕ、厚さ０．１５闘
の圧電板を接着して比較の振動子を製作した。The metal plate is a phosphor bronze plate of 0.1511L and 11L, and the width of the fixed part is 1011mm! - Molded into a racket shape with an effective length of 131m excluding the fixed part, with zircon on one side.
A comparative vibrator was manufactured by bonding a piezoelectric plate made of lead titanate porcelain with a diameter of 14 μm and a thickness of 0.15 μm.
次に、この比較の振動子と同一の振動子を製作し第１図
のａ図に示す如く、幅方向に７酊、長さ方向に５ｍｍの
寸法でその角を切り落し、長さ方向の中心軸に対して非
対象となし、この発明による振動子とした。Next, a vibrator identical to this comparative vibrator was manufactured, and its corners were cut off by 7 mm in the width direction and 5 mm in the length direction, as shown in Figure 1a. The vibrator according to the present invention was made asymmetrical with respect to the axis.
振動板には厚さ７５μｍのポリイミドフィルムを成形し
た直径３Ｑｉｉのコーン形振動板を用い、上記２種の振
動子先端部と振動板の中心点を接着結合し、合成樹脂製
のフレームに組み込み、振動子の固定部と振動板の周端
のそれぞれをフレームに接着し圧電スピーカに組み立て
た。For the diaphragm, a cone-shaped diaphragm with a diameter of 3 Qii made of a polyimide film with a thickness of 75 μm was used, and the tips of the two types of oscillators and the center point of the diaphragm were adhesively bonded, and the diaphragm was assembled into a synthetic resin frame. The fixing part of the vibrator and the peripheral edge of the diaphragm were each glued to the frame and assembled into a piezoelectric speaker.
次にこの圧電スピーカのアドミッタンスと実効値ＩＶの
電圧を印加した際の軸上１０ｃｍでの音圧レベルを測定
した。Next, the admittance of this piezoelectric speaker and the sound pressure level at 10 cm on the axis when a voltage of effective value IV was applied were measured.
アドミッタンスは第２図に示し、曲線Ａは本発明の場合
、曲線Ｂは比較例の場合である。The admittance is shown in FIG. 2, where curve A is for the present invention and curve B is for the comparative example.
両凸線から明らかな如く、振動子を非対称としたことに
より曲線Ａのａ部分に単軸対称の振動モードが生じてい
ることがわかる。As is clear from the biconvex lines, it can be seen that by making the vibrator asymmetrical, a uniaxially symmetrical vibration mode is generated in the a portion of the curve A.
すなわち、対称形とした比較例では周波数特性を第３図
に示す如く、その音圧値に大きな山谷を生じているのに
対して、単軸対称の振動モードを有する非対称形の本発
明の場合は、第４図に示す如く、周波数特性が著しく平
坦化されていることがわかる。In other words, in the comparative example with a symmetrical type, large peaks and troughs occur in the sound pressure value as shown in the frequency characteristics of the frequency characteristics as shown in Fig. 3, whereas in the case of the present invention with an asymmetric type having a uniaxially symmetrical vibration mode. As shown in FIG. 4, it can be seen that the frequency characteristics are significantly flattened.
以上詳述したように、この発明による非対称とした振動
子を駆動源とするスピーカは、従来のスピーカに比較し
て低域の再生能力が向上し、広帯域化され、さらに周波
数特性の平坦化を実現しており、実用的なスピーカとし
てすぐれた特性を示している。As detailed above, the speaker using an asymmetrical vibrator as a drive source according to the present invention has improved low-frequency reproduction ability, a wider band, and a flattened frequency response compared to conventional speakers. It has been realized and shows excellent characteristics as a practical speaker.
第１図はこの発明による圧電振動子を示す平面図、第２
図は実施例における圧電スピーカの周波数とアドミッタ
ンスとの関係を示す図表、第３図と第４図は実施例にお
ける圧電スピーカの周波数特性を示す図表で、第３図は
比較例、第４図はこの発明の場合を示す。
図中、１，１ａ・・・・・・振動子、２，２ａ・・・・
・・金属板、３・・・・・・圧電板、４・・・・・・支
持台、５・・・・・・振動板。FIG. 1 is a plan view showing a piezoelectric vibrator according to the present invention, and FIG.
The figure is a chart showing the relationship between the frequency and admittance of the piezoelectric speaker in the example, Figures 3 and 4 are charts showing the frequency characteristics of the piezoelectric speaker in the example, Figure 3 is a comparative example, and Figure 4 is a chart showing the frequency characteristics of the piezoelectric speaker in the example. A case of this invention will be shown. In the figure, 1, 1a... vibrator, 2, 2a...
...Metal plate, 3...Piezoelectric plate, 4...Support stand, 5...Vibration plate.
Claims (1)
成からなり、圧電振動子の巾方向寸法Ｗを実効長さ寸法
（７）で除した寸法比をη＝０．７５〜３とし、長さ方
向の中心軸に対して圧電振動子の形状を非対称となし、
振動先端側に振動板を結合した圧電スピーカ。1 It consists of a structure in which a piezoelectric plate is combined with a metal plate and one end of the plate is fixed, and the size ratio of the width direction dimension W of the piezoelectric vibrator divided by the effective length dimension (7) is set as η = 0.75 to 3. , the shape of the piezoelectric vibrator is asymmetrical with respect to the central axis in the length direction,
A piezoelectric speaker with a diaphragm connected to the vibrating tip.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17442580A JPS5948600B2 (en) | 1980-12-09 | 1980-12-09 | 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 |
|---|---|---|---|
| JP17442580A JPS5948600B2 (en) | 1980-12-09 | 1980-12-09 | piezoelectric speaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5797299A JPS5797299A (en) | 1982-06-16 |
| JPS5948600B2 true JPS5948600B2 (en) | 1984-11-27 |
Family
ID=15978315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17442580A Expired JPS5948600B2 (en) | 1980-10-29 | 1980-12-09 | piezoelectric speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5948600B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003158794A (en) * | 2001-11-20 | 2003-05-30 | Taiyo Yuden Co Ltd | Piezoelectric acoustic unit |
| WO2022259745A1 (en) * | 2021-06-10 | 2022-12-15 | ローム株式会社 | Transducer and method for manufacturing same |
-
1980
- 1980-12-09 JP JP17442580A patent/JPS5948600B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5797299A (en) | 1982-06-16 |
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