JPH02124598A - Manufacture of piezoelectric sounder - Google Patents
Manufacture of piezoelectric sounderInfo
- Publication number
- JPH02124598A JPH02124598A JP63278040A JP27804088A JPH02124598A JP H02124598 A JPH02124598 A JP H02124598A JP 63278040 A JP63278040 A JP 63278040A JP 27804088 A JP27804088 A JP 27804088A JP H02124598 A JPH02124598 A JP H02124598A
- Authority
- JP
- Japan
- Prior art keywords
- diaphragm
- resin case
- fixed
- side wall
- spring terminal
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 229920005989 resin Polymers 0.000 claims abstract description 39
- 239000011347 resin Substances 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 abstract description 6
- 238000000465 moulding Methods 0.000 abstract 2
- 239000000463 material Substances 0.000 description 4
- 239000013464 silicone adhesive Substances 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- HXNZTJULPKRNPR-UHFFFAOYSA-N borinine Chemical compound B1=CC=CC=C1 HXNZTJULPKRNPR-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
- 239000002184 metal Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は圧電サウンダ−の製造方法に関し、特に、圧
電体が固着された振動板を樹脂ケースに取り付けてなる
、圧電サウンダ−の製造方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a piezoelectric sounder, and particularly relates to a method for manufacturing a piezoelectric sounder in which a diaphragm to which a piezoelectric body is fixed is attached to a resin case. .
従来の圧電サウンダ−の例が、たとえば第６図および第
７図に示される。第６図に示す圧電サウンダ−では、樹
脂ケース１の側壁に振動板２がシリコーン接着剤３によ
って固着される。そして、振動板２に固着された圧電体
４には、端子５の先端部がはんだ６によって接続される
。端子５ば熱かしめ部７により、樹脂ケース１に固着さ
れる。Examples of conventional piezoelectric sounders are shown, for example, in FIGS. 6 and 7. In the piezoelectric sounder shown in FIG. 6, a diaphragm 2 is fixed to a side wall of a resin case 1 with a silicone adhesive 3. The tip of the terminal 5 is connected to the piezoelectric body 4 fixed to the diaphragm 2 by solder 6. The terminal 5 is fixed to the resin case 1 by the heat caulking part 7.
第７図に示す圧電サウンダ−では、振動板２は樹脂ケー
ス１の側壁と樹脂カバー８とによって圧接的に支持され
る。この樹脂カバー８は端子５の圧電体４への接触状態
を保持する機能も果たす。In the piezoelectric sounder shown in FIG. 7, the diaphragm 2 is supported by the side wall of the resin case 1 and the resin cover 8 in pressure contact. This resin cover 8 also functions to maintain the contact state of the terminal 5 with the piezoelectric body 4.
〔発明が解決しようとする課題］
第６図の圧電サウンダ−では、シリコーン接着剤３によ
って振動板２を樹脂ケース１に固着するとともに、端子
５を樹脂ケース１に熱かしめしなければならない。さら
に、圧電体４と端子５ははんだ６によって接続しなけれ
ばならない。したがって、第６図に示す圧電サウンダ−
では、その組み立てが煩雑になるという欠点があった。[Problems to be Solved by the Invention] In the piezoelectric sounder shown in FIG. 6, the diaphragm 2 must be fixed to the resin case 1 with a silicone adhesive 3, and the terminals 5 must be heat-stamped to the resin case 1. Furthermore, the piezoelectric body 4 and the terminal 5 must be connected by solder 6. Therefore, the piezoelectric sounder shown in FIG.
However, there was a drawback that the assembly was complicated.
他方、第７図に示す圧電サウンダ−では、シリコーン接
着剤３およびはんだ６を必要としないが、樹脂カバー８
を必要とする。したがって、別の金型が必要となり、コ
ストが上昇するという欠点があった。On the other hand, the piezoelectric sounder shown in FIG. 7 does not require the silicone adhesive 3 and the solder 6, but the resin cover 8
Requires. Therefore, another mold is required, resulting in an increase in cost.
それゆえに、この発明の主たる目的は、簡単に組み立て
られ、コスト低減が期待できる、圧電サウンダ−の製造
方法を提供することである。Therefore, the main object of the present invention is to provide a method of manufacturing a piezoelectric sounder that is easy to assemble and can be expected to reduce costs.
この発明は、ばね端子がインサート成型されるとともに
、側壁の内側に突起が形成された樹脂ケースを準備する
ステップ、圧電体が固着された振動板を準備するステッ
プ、ばね端子の先端部が圧電体に接触するように、その
周縁を樹脂ケースの突起に係止して振動板を仮固定する
ステップ、および振動板の周縁を側壁に熱かしめするス
テップを含む、圧電サウンダ−の製造方法である。This invention includes the steps of preparing a resin case in which a spring terminal is insert-molded and a protrusion formed on the inside of a side wall, preparing a diaphragm to which a piezoelectric material is fixed, and a step in which a tip of the spring terminal is made of a piezoelectric material. This method of manufacturing a piezoelectric sounder includes the steps of temporarily fixing the diaphragm by locking the periphery of the diaphragm to a protrusion of a resin case so as to make contact with the diaphragm, and heat staking the periphery of the diaphragm to a side wall.
ばね端子がインサート成型されるとともに、側壁に突起
が形成された樹脂ケースを得る。そして、圧電体が固着
された振動板を準備し、その振動板の周縁の一部を突起
に係止して、ばね端子の先端部が圧電体に接触するよう
に振動板を樹脂ケースに仮固定する。最後に、側壁の一
部を溶かして熱かしめを行い、突起によって仮固定され
た振動板を樹脂ケースの側壁に固着する。A resin case is obtained in which a spring terminal is insert-molded and a protrusion is formed on a side wall. Then, a diaphragm to which a piezoelectric body is fixed is prepared, a part of the periphery of the diaphragm is locked to a protrusion, and the diaphragm is temporarily placed in a resin case so that the tips of the spring terminals are in contact with the piezoelectric body. Fix it. Finally, a part of the side wall is melted and hot caulked to fix the diaphragm temporarily fixed by the projections to the side wall of the resin case.
この発明によれば、別の樹脂カバーを用いることなく、
端子を圧電体にはんだ付けする工程が省略できるので、
組み立てが簡単になるとともにコストダウンが可能にな
る。しかも、ばね端子は樹脂ケースにインサート成型さ
れるので、従来の熱かしめによる固定方法に比べて、機
械的に安定である。また、振動板は突起に一旦仮固定さ
れた後、熱かしめによって樹脂ケースに固定されるので
、振動板かばね端子に押し上げられて斜めになったまま
固定されるなどの失敗なしに、振動板を樹脂ケースに正
確に固定できる。According to this invention, without using a separate resin cover,
Since the process of soldering the terminal to the piezoelectric body can be omitted,
Assembling becomes easier and costs can be reduced. Moreover, since the spring terminal is insert-molded into the resin case, it is mechanically more stable than the conventional fixing method using heat caulking. In addition, the diaphragm is temporarily fixed to the protrusions and then fixed to the resin case by heat caulking, so there is no need to make mistakes such as the diaphragm being pushed up by the diaphragm or spring terminals and being fixed at an angle. Can be accurately fixed to the resin case.
この発明の上述の目的、その他の目的、特徴および利点
は、図面を参照して行う以下の実施例の詳細な説明から
一層明らかとなろう。The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.
第２図を参照して、この実施例の圧電サウンダ−１０は
、円板形のかつ平面部１２ａと側壁１２ｂとを有する樹
脂ケース１２を含み、この樹脂ケース１２の内側には平
面円形のキャビティ１４が形成される。Referring to FIG. 2, the piezoelectric sounder 10 of this embodiment includes a resin case 12 which is disk-shaped and has a flat portion 12a and a side wall 12b, and inside the resin case 12 is a cavity having a circular plan view. 14 is formed.
ケース１２の平面部１２ａの略中夫には、キャビティ１
４と外部とを連通ずるための空気孔１６が形成される。A cavity 1 is provided approximately at the center of the flat part 12a of the case 12.
An air hole 16 is formed to communicate the air hole 4 with the outside.
空気孔１６は、後述する振動板２２が振動したとき、そ
の振動によって生じる空気の流動を助けるためのもので
ある。The air holes 16 are for assisting the flow of air caused by the vibrations of the diaphragm 22, which will be described later.
樹脂ケース１２の平面部１２ａには、並置された２つの
端子板１８がインサート成型される。各々の端子板１８
の一方端（第２図では左端）から接続端子１８ａが延び
、この接続端子１８ａは樹脂ケース１２の平面部１２ａ
の一方（第２図では左）側面から露出する。Two terminal plates 18 arranged side by side are insert-molded in the flat part 12a of the resin case 12. Each terminal board 18
A connecting terminal 18a extends from one end (the left end in FIG. 2) of the resin case 12, and this connecting terminal 18a
It is exposed from one side (the left side in Figure 2).
また、各々の端子板１８の上面には、ばね端子１８ｂの
一方端が固着される。ばね端子１８ｂの他方端（自由端
）は、キャビティ１４内に突出する。ばね端子１８ｂは
、たとえぼりん青銅のような弾性金属からなり、その弾
性によって、後述する圧電体２４にその先端が圧接接続
される。Further, one end of a spring terminal 18b is fixed to the upper surface of each terminal plate 18. The other end (free end) of the spring terminal 18b projects into the cavity 14. The spring terminal 18b is made of an elastic metal such as borin bronze, and its elasticity allows its tip to be pressure-connected to a piezoelectric body 24, which will be described later.
樹脂ケース１２の平面部１２ａの下面には、上述の端子
板１８の一部を露出させるための露出穴２０が形成され
る。この露出穴２０は、圧電サウンダ−１０を実装する
とき、接続引出端子１８ａを用いないで、リード線（図
示せず）によって接続するためのものである。この場合
には、リード線が露出穴２０を通して端子板１８にはん
だ接続されるので、接続端子１８ａは不要となり、接続
端子１８ａは樹脂ケース１２の外面と面一に切断してお
けばよい。An exposure hole 20 is formed in the lower surface of the flat portion 12a of the resin case 12 to expose a portion of the terminal plate 18 described above. This exposure hole 20 is for connecting with a lead wire (not shown) when mounting the piezoelectric sounder 10 without using the connection pull-out terminal 18a. In this case, since the lead wire is soldered to the terminal plate 18 through the exposure hole 20, the connecting terminal 18a becomes unnecessary, and the connecting terminal 18a can be cut flush with the outer surface of the resin case 12.
樹脂ケース１２の側壁１２ｂには、キャビティ１４を密
閉するように、円板状の振動板２２の周縁が固着される
。振動板２２は、側壁１２ｂの一部を溶融して固めるい
わゆるパ熱かしめ”によって固定される。A peripheral edge of a disc-shaped diaphragm 22 is fixed to the side wall 12b of the resin case 12 so as to seal the cavity 14. The diaphragm 22 is fixed by so-called heat caulking, in which a portion of the side wall 12b is melted and solidified.
振動板２２の下面には、キャビティ１４の直径より若干
率さい直径を有する円板状の圧電体２４が固着される。A disk-shaped piezoelectric body 24 having a diameter slightly larger than the diameter of the cavity 14 is fixed to the lower surface of the diaphragm 22 .
図示しないが、この圧電体２４の下面には、上述のばね
端子１８ｂの先端が圧接接続される２つの電極が形成さ
れ、ばね端子１８ｂを通してそこに電圧が印加される。Although not shown, two electrodes are formed on the lower surface of the piezoelectric body 24 to which the tips of the above-mentioned spring terminals 18b are pressure-connected, and a voltage is applied thereto through the spring terminals 18b.
このような圧電サウンダ−１０は、次のようにして製造
され得る。Such a piezoelectric sounder 10 can be manufactured as follows.
まず、第３図に示すように、平面部１２ａと溶融部２６
を見込んだ大きさの側壁１２ｂとを有する樹脂ケース１
２を端子板１８とともにインサート成型する。このとき
、平面部１２ａには空気孔】６および露出穴２０が形成
されるとともに、側壁１２ｂの内側には段差面２８およ
び突起３０が形成される。段差面２８は、振動板２２を
仮固定する際に、振動板２２の周縁を配置する部分であ
る。突起３０は、その全周に亘って、周縁を段差面２８
に密着させて振動板２２を仮固定するものであり、この
実施例では、第４図に示すように、側壁１２ｂの内側の
対向する２箇所に形成される。First, as shown in FIG.
A resin case 1 having a side wall 12b having a size that allows for
2 is insert molded together with the terminal plate 18. At this time, an air hole 6 and an exposure hole 20 are formed in the plane portion 12a, and a stepped surface 28 and a protrusion 30 are formed inside the side wall 12b. The stepped surface 28 is a portion on which the periphery of the diaphragm 22 is arranged when the diaphragm 22 is temporarily fixed. The protrusion 30 has a stepped surface 28 along its circumferential edge.
The diaphragm 22 is temporarily fixed in close contact with the diaphragm 22, and in this embodiment, as shown in FIG. 4, the diaphragm 22 is formed at two opposing locations inside the side wall 12b.
そして、突起３０と段差面２８との間隔は、仮固定する
際に振動板２２を回動させる関係上、振動板２２の肉厚
より若干大きく設定される。The distance between the protrusion 30 and the step surface 28 is set to be slightly larger than the thickness of the diaphragm 22 because the diaphragm 22 is rotated during temporary fixation.
なお、後述のように、溶融部２６を軟化させなければな
らないので、樹脂ケース１２の材料としては、熱可塑性
樹脂（たとえばＰＢＴあるいはＰＥＴなど）が用いられ
る。Note that, as will be described later, since the melted portion 26 must be softened, a thermoplastic resin (for example, PBT or PET) is used as the material for the resin case 12.
一方、円板状の振動板２２には、第４図に示すように仮
固定の際に突起３０に嵌合される半円状の凹部３２が、
周縁」−で対向する２箇所に形成される。On the other hand, as shown in FIG. 4, the disk-shaped diaphragm 22 has a semicircular recess 32 that is fitted into the protrusion 30 during temporary fixation.
It is formed in two places facing each other at the periphery.
振動板２２を樹脂ケース１２に仮固定するとき、第４図
に示すように、凹部３２を突起３０に嵌め込み、振動板
２２の周縁を樹脂ケース１２の段差面２８上に密着させ
る。その後、周縁を段差面２８に密着させたままで、第
５図に示すように、振動板２２を回動させる。そうする
と、突起３０と段差面２８との間隙には、凹部３２が形
成されていない周縁部が配置され、第１図に示すように
、振動板２２の樹脂ケース１２への仮固定が完了する。When temporarily fixing the diaphragm 22 to the resin case 12, as shown in FIG. Thereafter, the diaphragm 22 is rotated, as shown in FIG. 5, while keeping its peripheral edge in close contact with the stepped surface 28. Then, a peripheral portion in which the recess 32 is not formed is placed in the gap between the protrusion 30 and the stepped surface 28, and as shown in FIG. 1, the temporary fixation of the diaphragm 22 to the resin case 12 is completed.
この仮固定の状態では、ばね端子１８ｂの先端部は所定
の圧力で圧電体２４に当接する。In this temporarily fixed state, the tip of the spring terminal 18b contacts the piezoelectric body 24 with a predetermined pressure.
最後に、溶融部２６（第３図）を加熱し、軟化した溶融
部２６の材料で突起３０を覆い隠すように振動板２２を
固着する。このようにして第２図に示すような圧電ザウ
ンダ−１０が完成する。Finally, the fused portion 26 (FIG. 3) is heated and the diaphragm 22 is fixed so that the softened material of the fused portion 26 covers the protrusion 30. In this way, a piezoelectric sounder 10 as shown in FIG. 2 is completed.
このとき、溶融部２６を軟化させてかつそれが硬化する
まで、振動板２２がばね端子１８ｂのばね圧で浮き上が
らないように押さえを置かなければならないが、突起３
０によって振動板２２を仮固定しているので、そのよう
な煩雑な作業なしに、正確に振動板２２を所定の位置に
固着することができる。At this time, until the molten part 26 is softened and hardened, a presser must be placed so that the diaphragm 22 does not rise due to the spring pressure of the spring terminal 18b, but the protrusion 3
Since the diaphragm 22 is temporarily fixed by the screws 0, the diaphragm 22 can be accurately fixed at a predetermined position without such complicated work.
第１図は第２図に示す圧電サウンダ−を製造する際に振
動板を仮固定した状態を示す断面図解図である。
第２図はこの発明に従って完成された圧電サウンダ−の
−例を示す断面図解図である。
第３図は樹脂ケースに振動板を仮固定する前の状態を示
す断面図解図である。
第４図は樹脂ケースの突起に振動板の凹部を嵌め込んだ
状態を示す上面図である。
第５図は第４図に示す状態から振動板を回動して振動板
を仮固定した状態を示す上面図である。
第６図および第７図はそれぞれ従来の圧電サウンダ−の
−例を示す断面図解図である。
図において、１０は圧電サウンダ−１１２は樹脂ケース
、１２ａは平面部、１２ｂは側壁、１４はキャビティ、
１８は端子板、１８ａは接続端子、１８ｂはばね端子、
２０は露出穴、２２は振動板、２４は圧電体、２６は溶
融部、２８は段差面、３０は突起、３２は凹部を示す。
特許出願人 株式会社 村田製作所
代理人 弁理士 山 １） 義 人
区
ぐ
派
固
Ｕコ
怖
区
法
へ
法FIG. 1 is an illustrative cross-sectional view showing a state in which the diaphragm is temporarily fixed when manufacturing the piezoelectric sounder shown in FIG. 2. FIG. FIG. 2 is an illustrative cross-sectional view showing an example of a piezoelectric sounder completed according to the present invention. FIG. 3 is an illustrative cross-sectional view showing a state before the diaphragm is temporarily fixed to the resin case. FIG. 4 is a top view showing a state in which the concave portion of the diaphragm is fitted into the protrusion of the resin case. FIG. 5 is a top view showing a state in which the diaphragm is temporarily fixed by rotating the diaphragm from the state shown in FIG. 4. FIGS. 6 and 7 are sectional views showing examples of conventional piezoelectric sounders, respectively. In the figure, 10 is a piezoelectric sounder, 112 is a resin case, 12a is a plane part, 12b is a side wall, 14 is a cavity,
18 is a terminal board, 18a is a connection terminal, 18b is a spring terminal,
20 is an exposure hole, 22 is a diaphragm, 24 is a piezoelectric body, 26 is a melted part, 28 is a step surface, 30 is a projection, and 32 is a recess. Patent applicant: Murata Manufacturing Co., Ltd. Representative: Patent attorney Yama 1) Righteous person, law, law, law, law
Claims (1)
に突起が形成された樹脂ケースを準備するステップ、 圧電体が固着された前記振動板を準備するステップ、 前記ばね端子の先端部が前記圧電体に接触するように、
その周縁を前記樹脂ケースの前記突起に係止して前記振
動板を仮固定するステップ、および 前記振動板の周縁を前記側壁に熱かしめするステップを
含む、圧電サウンダーの製造方法。[Claims] A step of preparing a resin case in which a spring terminal is insert-molded and a projection is formed on the inside of the side wall, a step of preparing the diaphragm to which a piezoelectric body is fixed, a tip of the spring terminal. such that the portion contacts the piezoelectric body,
A method for manufacturing a piezoelectric sounder, comprising the steps of temporarily fixing the diaphragm by locking its periphery to the protrusion of the resin case, and heat caulking the periphery of the diaphragm to the side wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63278040A JPH0769704B2 (en) | 1988-11-02 | 1988-11-02 | Piezoelectric sounder manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63278040A JPH0769704B2 (en) | 1988-11-02 | 1988-11-02 | Piezoelectric sounder manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02124598A true JPH02124598A (en) | 1990-05-11 |
| JPH0769704B2 JPH0769704B2 (en) | 1995-07-31 |
Family
ID=17591810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63278040A Expired - Fee Related JPH0769704B2 (en) | 1988-11-02 | 1988-11-02 | Piezoelectric sounder manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0769704B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0264998U (en) * | 1988-11-02 | 1990-05-16 | ||
| JPH0339798U (en) * | 1989-08-28 | 1991-04-17 | ||
| US5391053A (en) * | 1993-11-01 | 1995-02-21 | General Electric Company | Active noise control using noise source having adaptive resonant frequency tuning through variable panel loading |
| US5415522A (en) * | 1993-11-01 | 1995-05-16 | General Electric Company | Active noise control using noise source having adaptive resonant frequency tuning through stress variation |
| US5423658A (en) * | 1993-11-01 | 1995-06-13 | General Electric Company | Active noise control using noise source having adaptive resonant frequency tuning through variable ring loading |
| US5458222A (en) * | 1994-12-05 | 1995-10-17 | General Electric Company | Active vibration control of structures undergoing bending vibrations |
| US5558298A (en) * | 1994-12-05 | 1996-09-24 | General Electric Company | Active noise control of aircraft engine discrete tonal noise |
| US5584447A (en) * | 1994-12-19 | 1996-12-17 | General Electric Company | Noise control using a plate radiator and an acoustic resonator |
| US5590849A (en) * | 1994-12-19 | 1997-01-07 | General Electric Company | Active noise control using an array of plate radiators and acoustic resonators |
| US5618010A (en) * | 1994-12-19 | 1997-04-08 | General Electric Company | Active noise control using a tunable plate radiator |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0264998U (en) * | 1988-11-02 | 1990-05-16 |
-
1988
- 1988-11-02 JP JP63278040A patent/JPH0769704B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0264998U (en) * | 1988-11-02 | 1990-05-16 |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0264998U (en) * | 1988-11-02 | 1990-05-16 | ||
| JPH0339798U (en) * | 1989-08-28 | 1991-04-17 | ||
| US5391053A (en) * | 1993-11-01 | 1995-02-21 | General Electric Company | Active noise control using noise source having adaptive resonant frequency tuning through variable panel loading |
| US5415522A (en) * | 1993-11-01 | 1995-05-16 | General Electric Company | Active noise control using noise source having adaptive resonant frequency tuning through stress variation |
| US5423658A (en) * | 1993-11-01 | 1995-06-13 | General Electric Company | Active noise control using noise source having adaptive resonant frequency tuning through variable ring loading |
| US5458222A (en) * | 1994-12-05 | 1995-10-17 | General Electric Company | Active vibration control of structures undergoing bending vibrations |
| US5558298A (en) * | 1994-12-05 | 1996-09-24 | General Electric Company | Active noise control of aircraft engine discrete tonal noise |
| US5584447A (en) * | 1994-12-19 | 1996-12-17 | General Electric Company | Noise control using a plate radiator and an acoustic resonator |
| US5590849A (en) * | 1994-12-19 | 1997-01-07 | General Electric Company | Active noise control using an array of plate radiators and acoustic resonators |
| US5618010A (en) * | 1994-12-19 | 1997-04-08 | General Electric Company | Active noise control using a tunable plate radiator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0769704B2 (en) | 1995-07-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |