JPS5856317B2 - piezoelectric vibrator - Google Patents
piezoelectric vibratorInfo
- Publication number
- JPS5856317B2 JPS5856317B2 JP16604480A JP16604480A JPS5856317B2 JP S5856317 B2 JPS5856317 B2 JP S5856317B2 JP 16604480 A JP16604480 A JP 16604480A JP 16604480 A JP16604480 A JP 16604480A JP S5856317 B2 JPS5856317 B2 JP S5856317B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric
- vibrator
- width
- metal plate
- piezoelectric vibrator
- 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 28
- 238000005452 bending Methods 0.000 description 4
- 229910000906 Bronze Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000010974 bronze Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000011496 polyurethane foam Substances 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、圧電スピーカ等の発音体の駆動源に使用す
る圧電振動子の改良に関し、低音域の再生並びに実用的
な周波数域の再生を可能にした圧電振動子に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a piezoelectric vibrator used as a drive source for a sounding body such as a piezoelectric speaker, and relates to a piezoelectric vibrator that is capable of reproducing bass frequencies and practical frequency ranges. .
圧電振動子は、これを駆動源とした圧電スピーカにおい
て薄形化が容易であり、消費電力が非常に少ない等の特
徴を有している。A piezoelectric vibrator has the characteristics that it can be easily made thin in a piezoelectric speaker using the vibrator as a driving source, and consumes very little power.
近年、メロディ−又は合成音声発生用０集積回路が開発
されるにともない圧電スピーカは特に低消費電力０）特
徴から従来のダイナミックスピーカに取って代るもめと
注目されている。In recent years, with the development of integrated circuits for generating melodies or synthesized speech, piezoelectric speakers have attracted attention as a potential replacement for conventional dynamic speakers, particularly due to their low power consumption characteristics.
しかしながら、圧電スピーカは実用的な音域幅特に低音
域の再生が困難であり、その実用化が難しく、一部に高
音用として実用化されたにすぎなかった。However, piezoelectric speakers have difficulty in reproducing a practical sound range, particularly in the bass range, and have been put into practical use only in some cases for high-pitched sounds.
そこでこり発明は、実用的な周波数域め再生を目的とす
る圧電スピーカの駆動源として使用できる圧電振動子を
提供するものである。Therefore, the present invention provides a piezoelectric vibrator that can be used as a drive source for a piezoelectric speaker for the purpose of reproducing a practical frequency range.
この発明による圧電振動子は、片持ち梁構成としたバイ
モルフ圧電振動子の形状を特定し、発音体に構成した場
合の再生周波数を広帯域化させたも０であり、圧電振動
子の振動側幅を固定側のそれよりも実質的に広くとるこ
とを特徴としている。The piezoelectric vibrator according to the present invention specifies the shape of a bimorph piezoelectric vibrator having a cantilever structure, and when configured as a sounding body, the reproduction frequency is widened to 0, and the vibration side width of the piezoelectric vibrator is It is characterized by being substantially wider than that on the fixed side.
かかる構成からなる圧電振動子は、すでに出願人が提案
したものであるが、その後実験研究を続けたところ、圧
電振動子における振動先端部の金属板幅と振動子の有効
長さとの関係を特定することにより、この振動子を圧電
スピーカに組立てた際に、その再生周波数の広帯域化、
特に低域の出力向上が著しく、出力特性も平担化されて
再生音の質的な向上が得られることを知見し、この発明
を完成させたものである。A piezoelectric vibrator with such a configuration had already been proposed by the applicant, but after continued experimental research, the relationship between the width of the metal plate at the vibrating tip of the piezoelectric vibrator and the effective length of the vibrator was determined. By doing this, when this vibrator is assembled into a piezoelectric speaker, the reproduction frequency can be widened,
In particular, the present invention was completed based on the finding that the output in the low range is significantly improved, and the output characteristics are evened out, resulting in a qualitative improvement in the reproduced sound.
すなわち、この発明は、圧電板を複合した金属板Ｑつ一
方端を固定し、他方端を振動先端部とした圧電振動子に
おける振動先端部の金属板幅（ｄ）を、固定側金属板幅
に対して広くとり、かつ上記振動子の有効長さくｌｌ）
に対する寸法比ｄ／Ａの値を２を超え３までの範囲とし
た圧電振動子である。That is, in this invention, the metal plate width (d) of the vibrating tip of a piezoelectric vibrator in which one end is fixed and the other end is a vibrating tip of Q metal plates composed of piezoelectric plates is defined as the width of the metal plate on the fixed side. and the effective length of the above vibrator ll)
This piezoelectric vibrator has a dimension ratio d/A of more than 2 and up to 3.
以下にこの発明を図面に基づいて詳述するが、まず片持
ち梁構成とした圧電振動子として従来の短冊形圧電振動
子１を説明すると、第１図に示すように、短冊形の金属
板２の裏面に圧電板３を貼着し、一方端を例えばスピー
カケースの固定部４に挿入して固定し、他方端を振動先
端部とした構造であり、この振動先端部に振動板５の中
心点を結合して圧電スピーカに組立てる構成である。The present invention will be described in detail below based on the drawings. First, a conventional rectangular piezoelectric vibrator 1 will be explained as a piezoelectric vibrator having a cantilever structure. As shown in FIG. A piezoelectric plate 3 is pasted on the back surface of the diaphragm 2, one end is inserted and fixed into a fixing part 4 of a speaker case, and the other end is a vibrating tip. This is a configuration in which a piezoelectric speaker is assembled by connecting the center points.
図面では振動板５はその周端を発泡ポリウレタン０支持
部材６を介してスピーカケースの支持部７に固定しであ
る。In the drawing, the diaphragm 5 has its peripheral end fixed to a support portion 7 of a speaker case via a polyurethane foam support member 6.
こめ従来の短冊形圧電振動子１を１駆動源とした圧電ス
ピーカは、そり音響出力を測定すると、特に低域におけ
る出力が不足している。A piezoelectric speaker using the conventional rectangular piezoelectric vibrator 1 as one driving source is found to have insufficient output, especially in the low range, when measuring warpage acoustic output.
これに対して、この発明による圧電振動子１１は、第２
図に示すように、矩形の一方端の幅を対向する端の幅に
対して狭めるため、矩形の一方端の両隣辺側から一方端
の直角を含む四辺形で、矩形を切欠いた形状、例えて言
うならば卓球のラケシト状の金属板１２の中央部に圧電
板１３を接着等の手段で複合させ、金属板１２の幅の狭
い側を例えばスピーカケースの固定部１４に挿入して固
定し、金属板１２の幅の広い側を、振動先端部とした構
造である。On the other hand, the piezoelectric vibrator 11 according to the present invention has a second
As shown in the figure, in order to make the width of one end of the rectangle narrower than the width of the opposite end, it is a quadrilateral that includes a right angle at one end from both adjacent sides of one end of the rectangle, and the rectangle is cut out. In other words, a piezoelectric plate 13 is bonded to the center of a table tennis racket-shaped metal plate 12 using adhesive or other means, and the narrow side of the metal plate 12 is inserted into, for example, a fixing part 14 of a speaker case and fixed. , the wider side of the metal plate 12 is the vibrating tip.
この圧電振動子１１の振動先端部に、スピーカケースの
支持部１７に発泡ポリウレタンＯ支持部材１６を介して
その周端を固定した振動板１５の中心点を結合させると
圧電スピーカに組立てることができる。A piezoelectric speaker can be assembled by connecting the center point of a diaphragm 15 whose circumferential end is fixed to the supporting portion 17 of the speaker case via a foamed polyurethane O supporting member 16 to the vibrating tip of the piezoelectric vibrator 11. .
以上のように、振動子の先端側幅を固定側よりも広くと
ったこの発明による圧電振動子１１を駆動源とした圧電
スピーカは、その音響出力を測定すると低域の出力が向
上し、実用的な音域幅において平担な周波数特性が得ら
れる。As described above, the piezoelectric speaker using the piezoelectric vibrator 11 according to the present invention, in which the width on the tip side of the vibrator is wider than that on the fixed side, has an improved low-frequency output when its acoustic output is measured, and is suitable for practical use. A flat frequency response can be obtained over a wide range.
この発明による圧電振動子による効果、特にスピーカの
低音域の出力音圧の向上は、従来の短冊形振動子の場合
は低域の出力を振動子の長さ方向の屈曲振動にのみ依存
しているのに対して、振動子の長さ方向と同時に幅方向
の屈曲振動をも利用しているからである。The effect of the piezoelectric vibrator according to this invention, especially the improvement in the output sound pressure in the low frequency range of the speaker, is that in the case of a conventional rectangular vibrator, the low frequency output depends only on the bending vibration in the longitudinal direction of the vibrator. This is because, on the other hand, bending vibration in the width direction of the vibrator is utilized simultaneously with the length direction of the vibrator.
すなわち、振動子が屈曲共振する時にスピーカの音響出
力が増大するものであるが、従来の短冊形振動子では長
さ方向の第１次層曲共振周波数（ｆｌ）と第２次層曲共
振周波数（ｆ２）以外には共振点がなく、シかもｆｌ
とｆ２ との周波数が大きくはなれているためｆｌ
とｆ２ との間の音響出力が低下している。In other words, the acoustic output of the speaker increases when the vibrator undergoes flexural resonance, but in conventional rectangular vibrators, the first-order laminar resonance frequency (fl) and the second-order laminar resonance frequency in the longitudinal direction increase. There is no resonance point other than (f2), and it may be fl
Since the frequencies of and f2 are far apart, fl
The acoustic power between and f2 is decreasing.
これに対して、この発明の圧電振動子り場合は、上記の
１次げ、）と２次（ｆ２）の屈曲共振周波数の間に振動
子の幅方向における第１次層曲共振周波数（ｆ１′）が
存在し、特に低音域における音響出力が向上して再生音
の広帯域化が達成される。On the other hand, in the case of the piezoelectric vibrator of the present invention, the first layer bending resonance frequency in the width direction of the vibrator (f1 '), the acoustic output is improved, especially in the low frequency range, and a wide band of reproduced sound is achieved.
従って、この発明による振動子の有効長さく７）と振動
子の振動先端部の幅（ｄ）との関係が重要になるが、振
動先端部０幅（ｄ）を有効長さＣ１１）で除した寸法比
ｄ／ｌの値を、０．７５〜３の範囲とすることにより、
上記の幅方向の第１次層曲共振周波数（ｆ、’）を（ｆ
、）と（ｆ２）との間に有効に位置させることができ、
実用的な音域幅全体の音響出力が向上する。Therefore, the relationship between the effective length 7) of the vibrator according to the present invention and the width (d) of the vibrating tip of the vibrator is important, and the zero width (d) of the vibrating tip is divided by the effective length C11). By setting the value of the dimension ratio d/l in the range of 0.75 to 3,
The above first-order layered resonance frequency (f,') in the width direction is defined as (f
, ) and (f2),
Improves acoustic output over the entire practical range width.
さらに、上記寸法比ｄ／７の値を２を超え３までの範囲
に限定すると、同値２以下と比較して出力特性がより平
担化されて広い帯域にわたって出力がより高くなり、再
生音の質的な向上が著しく、再生音の質的な向上が著し
く、実用化にあたって有利となる。Furthermore, if the value of the above dimension ratio d/7 is limited to a range exceeding 2 and up to 3, the output characteristics will be more flattened and the output will be higher over a wide band compared to the same value of 2 or less, and the reproduced sound will be The quality of the reproduced sound is significantly improved, which is advantageous for practical use.
次に、この発明による圧電振動子の他の部分の形状であ
るが、振動子の固定側の金属板幅は任意であり、振動側
の大きさ等から適宜選定すればよい。Next, regarding the shape of other parts of the piezoelectric vibrator according to the present invention, the width of the metal plate on the fixed side of the vibrator is arbitrary, and may be appropriately selected based on the size of the vibrating side, etc.
また圧電板１３はこれまで図示したような金属板１２の
片面に複合させるほか、両面に複合させるのもよく、第
３図のａ図に示すように、圧電板１３を振動子の固定部
１４内の金属板１２部分まで伸ばすこともよく、この場
合は長さ方向の第１久居曲振動勢力が増大する。Furthermore, the piezoelectric plate 13 is not only composited on one side of the metal plate 12 as shown above, but also composited on both sides.As shown in FIG. It may also be extended to the inner metal plate 12 portion, in which case the first Kuikoku vibration force in the length direction increases.
そして、圧電板１３の幅を金属板１２に合せて横方向に
広げて幅方向の屈曲振動勢力を増大させるのもよい。It is also possible to widen the width of the piezoelectric plate 13 laterally to match the width of the metal plate 12 to increase the bending vibration force in the width direction.
またａ図では振動板１５と振動子１１との結合点を黒丸
点で示すように圧電板１３を貼着した金属板１２上とし
ているが、金属板１２の振動先端側を一部突出させて振
動板１５との結合を行なうのもよい。In addition, in Figure a, the connection point between the diaphragm 15 and the vibrator 11 is on the metal plate 12 to which the piezoelectric plate 13 is attached, as shown by the black circle, but the vibrating tip side of the metal plate 12 is partially protruded. It is also advisable to couple it to the diaphragm 15.
また、金属板１２の形状において矩形の切欠いた部分の
形状は、特定されるものでなく適宜選定すればよい。Furthermore, the shape of the rectangular cutout in the shape of the metal plate 12 is not specified and may be selected as appropriate.
例えば、第３図のａ図に示すように金属板１２外形を直
線で構成するほか、同す図、Ｃ図に示すような曲線で外
形を構成しほぼ半円形とした金属板１２でもよく、ｂ図
では圧電板１３も金属板１２に合せた半円形のものを貼
着し、Ｃ図では円形の圧電板１３を用いている。For example, in addition to forming the outer shape of the metal plate 12 with a straight line as shown in Figure 3A, the outer shape of the metal plate 12 may be formed with a curved line and approximately semicircular as shown in Figure C of the same figure. In Figure B, a semicircular piezoelectric plate 13 matching the metal plate 12 is attached, and in Figure C, a circular piezoelectric plate 13 is used.
これまで金属板１２の形状を上記の矩形を切欠いた形状
を例にして説明したが、振動子１１の振動側幅を固定側
めそれより実質的に広くとることを特徴とするこの発明
において、多種の形状が利用でき、例えば楕円形の長手
方向の円周部分に矩形を合せたほぼ楕円形の金属板１２
とするのもよく、楕円形より突出した矩形の部分を固定
側とし、例えば上記した円形の圧電板１３を複合させて
振動子とするのもよい。Up to now, the shape of the metal plate 12 has been explained using the above-mentioned rectangular notch as an example, but in this invention, the width of the vibration side of the vibrator 11 is substantially wider than that of the fixed side. Various shapes can be used, for example, a substantially elliptical metal plate 12 with a rectangle aligned with the longitudinal circumference of the ellipse.
Alternatively, the rectangular portion protruding from the ellipse may be used as the fixed side, and the above-mentioned circular piezoelectric plate 13 may be combined to form a vibrator.
次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。Next, an example according to the present invention will be shown to clarify its effects.
まず第１図に示した従来の短冊形振動子１は、長さ１６
朋、幅８朋、厚さ０．１５ｍｍのりん青銅板からなる金
属板２に、長さ１０ｍｙｔ、幅８ ｍｒｒｔ、厚さ０、
１５ ｍｍ０）ジルコン・チタン酸鉛系圧電磁器板から
なる圧電板３を接着したもＯで、振動子１の固定部分を
３皿としてスピーカケースの固定部４に接着固定し、ス
ピーカケースの支持部７に発泡ポリウレタンシートから
なる支持部材６を介して固定した厚さ５０μｍ１直径３
０關のポリイミドフィルムからなる振動板５の中心点と
振動子１の先端を接着剤で結合し圧電スピーカに仕上げ
た。First, the conventional rectangular vibrator 1 shown in FIG. 1 has a length of 16
A metal plate 2 made of a phosphor bronze plate with a width of 8 mm and a thickness of 0.15 mm has a length of 10 myt, a width of 8 mrrt, a thickness of 0,
15 mm0) A piezoelectric plate 3 made of a zircon-lead titanate-based piezoelectric ceramic plate is glued and fixed to the fixing part 4 of the speaker case with three plates as the fixing part of the vibrator 1, and the support part of the speaker case is fixed to the fixing part 4 of the speaker case. 7 with a thickness of 50 μm and a diameter of 3 fixed via a support member 6 made of a foamed polyurethane sheet.
The center point of the diaphragm 5 made of a 0.5 mm polyimide film and the tip of the vibrator 1 were bonded with adhesive to form a piezoelectric speaker.
これに対して第３図のａ図に示したこの発明による圧電
振動子１１は、長さ１６關、固定側幅１１０ｍｍ５振動
先端部幅２８關、厚さ０．１５ｍｍのりん青銅板からな
る金属板１２に、長さ１０間、幅１５ｍｍ、厚さ０．１
５ ｍｒｒｔＯ）ジルコン・チタン酸鉛系圧電磁器から
なる圧電板１３を接着して圧電振動子（ｄ／Ａ＝２．２
）とした。On the other hand, the piezoelectric vibrator 11 according to the present invention shown in FIG. Plate 12 has a length of 10 mm, a width of 15 mm, and a thickness of 0.1 mm.
5 mrrtO) A piezoelectric vibrator (d/A = 2.2
).
次にスピーカケースと振動板１５には上記の従来例と同
じものを使用し、固定部１４での金属板１２の固定長さ
を３ｍｍとして従来例と同様に振動子の有効長さ１３關
に設定し、圧電スピーカに仕上げた。Next, the speaker case and diaphragm 15 are the same as those in the conventional example, and the length of the metal plate 12 fixed at the fixing part 14 is set to 3 mm, so that the effective length of the vibrator is 13 as in the conventional example. I set it up and made it into a piezoelectric speaker.
さらに、長さ１６間、固定側幅１０７ＩＬ７ＩＬ１振動
先端部幅３６關、厚さ０．１５ｍｍのりん青銅板からな
る金属板１２と、長さ１０ｍｍ１幅２０ｍｍ１厚さ０．
１５ｍｍのジルコン・チタン酸鉛系圧電磁器からなる圧
電板１３とを用いて、ｄｌｌ＝２．８の圧電振動子とし
、同様に圧電スピーカに仕上げた。Furthermore, a metal plate 12 made of a phosphor bronze plate with a length of 16 mm, a width of the fixed side of 107 mm, a width of the vibrating tip of 36 mm, and a thickness of 0.15 mm, and a metal plate 12 of 10 mm in length, 20 mm in width, and 0 mm in thickness.
A piezoelectric vibrator with dll=2.8 was made using a piezoelectric plate 13 made of a 15 mm zircon-lead titanate piezoelectric ceramic, and a piezoelectric speaker was similarly completed.
この３つの圧電スピーカに実効値１■０）正弦波電圧を
加えて、スピーカの軸上１０ｃＩｒＬでの音響出力を測
定し、従来の短冊形振動子を用いた場合を第４図に、こ
の発明による振動子のうちｄ／Ａ２．２の場合を第５図
に示し、ｄｌｌ＝２．８の場合を第６図に示す。An effective value of 1■0) sine wave voltage was applied to these three piezoelectric speakers, and the acoustic output at 10 cIrL on the axis of the speakers was measured. FIG. 5 shows the case of d/A of 2.2, and FIG. 6 shows the case of dll=2.8.
従来例の場合、その周波数特性は、第１次層曲共振（ｆ
ｌ）が約０．９ ＫＨｚ、第２次層曲共振（ｆ２）が約
８ＫＨｚに生じており他に共振点がなくｆｌ とｆ２
との間の音響出力が大きく低下していることが分かる
。In the case of the conventional example, its frequency characteristic is the first-order laminar resonance (f
l) occurs at about 0.9 KHz, and the second layer resonance (f2) occurs at about 8 KHz, and there are no other resonance points, so fl and f2
It can be seen that the acoustic output between the
これに対してこの発明の場合は、ｆｌ とｆ２ との
間に振動子の幅方向０）第１次共振σ、′）、が生じて
おり、特に低域の出力が向上し実用的な広い周波数域に
わたって十分な出力が得られていることが分かる。On the other hand, in the case of this invention, a first-order resonance 0), σ,') in the width direction of the vibrator occurs between fl and f2, which improves the low-frequency output in particular and provides a practical wide It can be seen that sufficient output is obtained across the frequency range.
次に上述したこり発明による実施例と同一寸法、素材で
、金属板１２の振動先端部幅のみ種々変化させて、圧電
振動子を作製して共振周波数の変化を測定した。Next, piezoelectric vibrators were manufactured using the same dimensions and materials as in the embodiment according to the invention described above, but only the width of the vibrating tip of the metal plate 12 was varied, and changes in resonance frequency were measured.
その結果は、横軸に振動子Ｏ先端幅（ｄ）を有効長さで
除したｄｌｌの値をとり、縦軸に共振周波数をとった第
７図のグラフに示している。The results are shown in the graph of FIG. 7, in which the horizontal axis represents the value of dll, which is the width (d) of the tip of the vibrator O divided by the effective length, and the vertical axis represents the resonant frequency.
結果から明らかなようにｄｌｌの値が２を超え３までの
範囲において、幅方向の第１次共振（ｆ、’）が長さ方
向の第１次共振（ｆｌ）と第２次共振（ｆ２）との間に
有効に位置していることがわかる。As is clear from the results, in the range of dll values exceeding 2 and up to 3, the first resonance in the width direction (f,') is the first resonance in the length direction (fl) and the second resonance (f2 ).
以上に詳述したごとくこの発明による圧電振動子は、振
動子の振動先端側の幅を固定側の幅に対して広くとった
ことにより、圧電スピーカに組立てた場合に得られる再
生音は、特に低音域の出力が向上し、出力特性が平担化
してすぐれた周波数特性を示しており、再生音の質的な
向上が得られ実用化に適している。As detailed above, in the piezoelectric vibrator according to the present invention, the width of the vibrating tip side of the vibrator is made wider than the width of the fixed side, so that the reproduced sound obtained when assembled into a piezoelectric speaker is particularly The output in the bass range has been improved, the output characteristics have been flattened, and the frequency characteristics have been excellent, resulting in a qualitative improvement in the reproduced sound, making it suitable for practical use.
第１図は従来の短冊形振動子の側面図と下面図、第２図
はこの発明による圧電振動子の側面図と下面図、第３図
はこの発明による他の実施例を示す下面図、第４図は実
施例における従来スピーカ０周波数と音響出力との関係
を示す図表、第５図、第６図は実施例におけるこの発明
による圧電スピーカの周波数と音響出力との関係を示す
図表、第７図は実施例における振動子のｄ／Ｖと共振周
波数との関係を示す図表である。
図中１・・・・・・短冊形振動子、２，１２・・・・・
・金属板、３．１３・・・・・・圧電板、４，１４・・
・・・・固定部、５゜１５・・・・・・振動板、６，１
６・・・・・・支持部材、７，１７・・・・・・支持部
、１１・・・・・・圧電振動子。1 is a side view and a bottom view of a conventional rectangular vibrator, FIG. 2 is a side view and a bottom view of a piezoelectric vibrator according to the present invention, and FIG. 3 is a bottom view showing another embodiment according to the present invention. FIG. 4 is a chart showing the relationship between the zero frequency and the acoustic output of a conventional speaker in an embodiment, and FIGS. FIG. 7 is a chart showing the relationship between d/V and resonance frequency of the vibrator in the example. In the figure, 1...... rectangular vibrator, 2, 12...
・Metal plate, 3.13...Piezoelectric plate, 4,14...
... Fixed part, 5゜15 ... Vibration plate, 6,1
6... Support member, 7, 17... Support part, 11... Piezoelectric vibrator.
Claims (1)
を振動先端部とした圧電振動子における振動先端部の金
属板幅（ｄ）を、固定側金属板幅に対して広くとり、か
つ上記振動子の有効長さくｌ）に対する寸法比ｄ／７の
値を２を超え３までの範囲とした圧電振動子。1. In a piezoelectric vibrator in which one end of a metal plate composed of a piezoelectric plate is fixed and the other end is a vibrating tip, the metal plate width (d) of the vibrating tip is made wider than the width of the metal plate on the fixed side, and a piezoelectric vibrator in which the value of the dimension ratio d/7 to the effective length (l) of the vibrator is in the range of more than 2 and up to 3.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16604480A JPS5856317B2 (en) | 1980-11-25 | 1980-11-25 | piezoelectric vibrator |
| 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 |
|---|---|---|---|
| JP16604480A JPS5856317B2 (en) | 1980-11-25 | 1980-11-25 | piezoelectric vibrator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5789397A JPS5789397A (en) | 1982-06-03 |
| JPS5856317B2 true JPS5856317B2 (en) | 1983-12-14 |
Family
ID=15823904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16604480A Expired JPS5856317B2 (en) | 1980-10-29 | 1980-11-25 | piezoelectric vibrator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5856317B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6122405A (en) * | 1984-07-10 | 1986-01-31 | Hitachi Ltd | Bias current circuit |
| JPS63253507A (en) * | 1987-04-09 | 1988-10-20 | Matsushita Electric Ind Co Ltd | Magnetic recorder and reproducing device |
-
1980
- 1980-11-25 JP JP16604480A patent/JPS5856317B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6122405A (en) * | 1984-07-10 | 1986-01-31 | Hitachi Ltd | Bias current circuit |
| JPS63253507A (en) * | 1987-04-09 | 1988-10-20 | Matsushita Electric Ind Co Ltd | Magnetic recorder and reproducing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5789397A (en) | 1982-06-03 |
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