JPS6349994Y2 - - Google Patents
Info
- Publication number
- JPS6349994Y2 JPS6349994Y2 JP1821883U JP1821883U JPS6349994Y2 JP S6349994 Y2 JPS6349994 Y2 JP S6349994Y2 JP 1821883 U JP1821883 U JP 1821883U JP 1821883 U JP1821883 U JP 1821883U JP S6349994 Y2 JPS6349994 Y2 JP S6349994Y2
- Authority
- JP
- Japan
- Prior art keywords
- diameter end
- diaphragm
- disc
- truncated cone
- shaped diaphragm
- 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
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000005452 bending Methods 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Description
【考案の詳細な説明】
〈産業上の利用分野〉
本考案は円板形振動板を用いた平面スピーカに
関するものである。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a flat speaker using a disc-shaped diaphragm.
〈従来技術〉
従来この種のスピーカの振動板部分は一般に第
１図に示す如く形成されている。即ち第１図にお
いて、１は円板形振動板、２は該振動板１の外周
に設けられたエツジであり、前記円板形振動板１
は該エツジ２を介してフレーム（図示せず）等に
支持されている。３は上記円板形振動板１の裏面
に固定された円錐台形筒体であり、該筒体３の径
小端側にはボイスコイルボビン４が形成されてお
り、該コイルボビン４にボイスコイル５が巻回さ
れている。そして上記ボイスコイル５を磁気回路
の磁気ギヤツプ内に配置するとともに、該コイル
５に電気信号を印加すると振動板１が振動し音波
を放射するものである。<Prior Art> Conventionally, the diaphragm portion of this type of speaker is generally formed as shown in FIG. That is, in FIG. 1, 1 is a disc-shaped diaphragm, and 2 is an edge provided on the outer periphery of the diaphragm 1.
is supported by a frame (not shown) or the like via the edge 2. Reference numeral 3 denotes a truncated conical cylinder fixed to the back surface of the disc-shaped diaphragm 1. A voice coil bobbin 4 is formed on the small diameter end side of the cylinder 3, and a voice coil 5 is mounted on the coil bobbin 4. It is wrapped. The voice coil 5 is placed in a magnetic gap of a magnetic circuit, and when an electric signal is applied to the coil 5, the diaphragm 1 vibrates and emits sound waves.
ここで上記円錐台形筒体３の径大端部の直径が
円板形振動板１の直径に比較して非常に小さい場
合、円板形振動板１の内周部と外周部とが逆相で
分割共振するため、その音圧周波数特性は第４図
の実線に示す如く特定の周波数r1附近において
ピークデイツプが現れる。 Here, if the diameter of the large-diameter end of the truncated conical cylinder 3 is very small compared to the diameter of the disc-shaped diaphragm 1, the inner circumference and the outer circumference of the disc-shaped diaphragm 1 are out of phase. As a result, the sound pressure frequency characteristic exhibits a peak dip near a specific frequency r1 , as shown by the solid line in FIG.
なお、円板形振動板１の曲げ剛性が高く各方向
において等しく（等方性）、且つエツジ２が軽量
で柔い場合には、上記分割共振の節は円板形振動
板１の直径の約68％の円となる。なお第４図にお
ける周波数r2は節円が２つ、r3は節円が３つと
なる振動モードに対応している。 Note that if the bending rigidity of the disc-shaped diaphragm 1 is high and equal in each direction (isotropic), and the edges 2 are lightweight and soft, the above-mentioned split resonance node will be equal to the diameter of the disc-shaped diaphragm 1. Approximately 68% yen. Note that the frequency r 2 in FIG. 4 corresponds to a vibration mode with two nodal circles, and the frequency r 3 corresponds to a vibration mode with three nodal circles.
第１図に示す従来例において、周波数r1にお
ける節円の位置に円錐台形筒体３の径大端部を取
付けた場合、音圧周波数特性における周波数r1
のピークデイツプは第４図に波線で示すように消
失され、平担領域が周波数r2まで拡張される。 In the conventional example shown in FIG. 1, when the large diameter end of the truncated conical cylinder 3 is attached to the position of the nodal circle at the frequency r 1 , the frequency r 1 in the sound pressure frequency characteristic
The peak dip of is eliminated as shown by the dotted line in FIG. 4, and the flat region is extended to frequency r2 .
〈問題点〉
しかしながら、円板形振動板１の曲げ剛性が低
い場合、上記従来例のように節円駆動を行なつて
も、周波数r1でのピークデイツプが消失せずに
残ることがあり、補強リブを追加する等の２次加
工を施こす必要があつた。<Problem> However, if the bending rigidity of the disc-shaped diaphragm 1 is low, even if nodal circular drive is performed as in the conventional example above, the peak dip at frequency r 1 may remain without disappearing. It was necessary to perform secondary processing such as adding reinforcing ribs.
〈目的〉
本考案はこのような点に鑑みなされたものであ
り、曲げ剛性の低い円板形振動板を用いた場合で
も音圧周波数特性上の平担領域を容易に拡張する
ことができる平面スピーカを提供するものであ
る。<Purpose> The present invention was developed in view of these points, and it is a flat surface that can easily expand the flat region of sound pressure frequency characteristics even when using a disc-shaped diaphragm with low bending rigidity. It provides speakers.
〈実施例〉
以下図面に示す実施例に従つて本考案を説明す
る。<Example> The present invention will be described below according to an example shown in the drawings.
第２図に本考案の一実施例を示す。ここで第１
図に示す従来例と同一部分には同一符号を附記し
ている。ここでは特に従来の円錐台形筒体３の代
わりに予めスチレン・アクリル等の発泡樹脂材を
用いて第３図に示すようにその径大端部６ａと径
小端部６ｂの中心軸が互いに偏心した円錐台体６
を形成し、該円錐台体６の径小端部６ｂの中心軸
が円板形振動板１の中心軸と一致するように円錐
台体６の径大端部６ａを振動板１に偏心して取付
けてなるものである。 FIG. 2 shows an embodiment of the present invention. Here the first
The same parts as in the conventional example shown in the figure are given the same reference numerals. Here, in place of the conventional truncated conical cylinder 3, a foamed resin material such as styrene or acrylic is used in advance so that the central axes of the large-diameter end 6a and the small-diameter end 6b are eccentric to each other, as shown in FIG. truncated cone body 6
The large diameter end 6a of the truncated cone body 6 is eccentric to the diaphragm 1 so that the central axis of the small diameter end 6b of the truncated cone body 6 coincides with the central axis of the disc-shaped diaphragm 1. It must be installed.
なお、この場合円錐台体６の径大端部は節円径
（平板形振動板径の68％）と同等が望ましい。ま
た該円錐台体６の偏心度合は比較的任意に選ぶこ
とが可能である。 In this case, it is desirable that the large diameter end of the truncated cone body 6 be equal to the nodal circle diameter (68% of the diameter of the flat diaphragm). Further, the degree of eccentricity of the truncated cone body 6 can be selected relatively arbitrarily.
上記のように形成された平面スピーカでは、円
板形振動板１を駆動している円錐台体６の径大端
が該動板１とは同心円上にはなく振動板１の駆動
円に偏心しているため不要な共振の発生を防止で
きる。その結果この場合の音圧周波数特性は第５
図の実線ａに示す如く、波線ｂに示す従来例と比
較すれば明らかなように、ピークデイツプが消失
され、平担領域が大巾に拡張される。 In the planar speaker formed as described above, the large-diameter end of the truncated cone body 6 that drives the disc-shaped diaphragm 1 is not on a concentric circle with the moving plate 1, but is offset to the driving circle of the diaphragm 1. This prevents unnecessary resonance from occurring. As a result, the sound pressure frequency characteristic in this case is the fifth
As shown by the solid line a in the figure, when compared with the conventional example shown by the wavy line b, the peak dip is eliminated and the flat area is greatly expanded.
〈効果〉
以上のように本考案の平面スピーカによれば、
径大端部と径小端部の中心軸が互いに偏心した発
泡樹脂製の円錐台体を形成し、該円錐台体の小径
端部にボイスコイルボビンを取付け、大径端部を
円板形振動板の裏面に取付けるようにしているた
め、振動板の節円と駆動円とが偏心され不要な共
振が抑えられ、音圧周波数特性の平担領域が大巾
に拡張される。<Effects> As described above, according to the flat speaker of the present invention,
A truncated cone made of foamed resin is formed with the central axes of the large-diameter end and the small-diameter end eccentric to each other, and a voice coil bobbin is attached to the small-diameter end of the truncated cone, and the large-diameter end is used for disk-shaped vibration. Since it is attached to the back surface of the plate, the nodal circle and drive circle of the diaphragm are eccentric, suppressing unnecessary resonance and greatly expanding the flat region of sound pressure frequency characteristics.
さらに本考案の平面スピーカによれば、曲げ剛
性の低い円板形振動板を用いた場合でも平担な音
圧周波数特性を得ることができ、振動板を軽量化
することが可能となり、音圧レベルの向上を図る
ことも可能となる。 Furthermore, according to the planar speaker of the present invention, even when using a disc-shaped diaphragm with low bending rigidity, it is possible to obtain flat sound pressure frequency characteristics, making it possible to reduce the weight of the diaphragm, It is also possible to improve the level.
第１図は従来一般の平面スピーカの要部断面
図、第２図は本考案の一実施例の要部断面図、第
３図ａ，ｂは同実施例に用いられる円錐台体の平
面図及びＸ−X′線断面図、第４図は従来の平面
スピーカの音圧周波数特性を説明するための説明
図、第５図は本考案の一実施例の音圧周波数特性
線図である。
１……円板形振動板、２……エツジ、４……ボ
イスコイルボビン、５……ボイスコイル、６……
円錐台体。
Fig. 1 is a cross-sectional view of a main part of a conventional general flat speaker, Fig. 2 is a cross-sectional view of a main part of an embodiment of the present invention, and Fig. 3 a and b are plan views of a truncated cone body used in the same embodiment. 4 is an explanatory diagram for explaining the sound pressure frequency characteristics of a conventional flat speaker, and FIG. 5 is a sound pressure frequency characteristic diagram of an embodiment of the present invention. 1...Disc-shaped diaphragm, 2...Edge, 4...Voice coil bobbin, 5...Voice coil, 6...
truncated cone.
Claims (1)
発泡樹脂製の円錐台形体を形成し、該円錐台形体
の径小端部にボイスコイルボビンを取付け且つ径
大端部を円板形振動板の裏面に偏心して取付けた
ことを特徴とする平面スピーカ。 A truncated conical body made of foamed resin is formed with the central axes of the large diameter end and the small diameter end eccentric to each other, and a voice coil bobbin is attached to the small diameter end of the truncated conical body, and the large diameter end is shaped like a disk. A flat speaker characterized by being mounted eccentrically on the back of the diaphragm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1821883U JPS59125197U (en) | 1983-02-10 | 1983-02-10 | flat speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1821883U JPS59125197U (en) | 1983-02-10 | 1983-02-10 | flat speaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59125197U JPS59125197U (en) | 1984-08-23 |
| JPS6349994Y2 true JPS6349994Y2 (en) | 1988-12-22 |
Family
ID=30149423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1821883U Granted JPS59125197U (en) | 1983-02-10 | 1983-02-10 | flat speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59125197U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5179543B2 (en) * | 2010-06-23 | 2013-04-10 | 三菱電機株式会社 | Fluid transfer device |
| JP5506960B2 (en) * | 2013-01-09 | 2014-05-28 | 三菱電機株式会社 | Fluid transfer device |
-
1983
- 1983-02-10 JP JP1821883U patent/JPS59125197U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59125197U (en) | 1984-08-23 |
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