JPH065298U - Low leakage magnetic flux type speaker - Google Patents
Low leakage magnetic flux type speakerInfo
- Publication number
- JPH065298U JPH065298U JP9375391U JP9375391U JPH065298U JP H065298 U JPH065298 U JP H065298U JP 9375391 U JP9375391 U JP 9375391U JP 9375391 U JP9375391 U JP 9375391U JP H065298 U JPH065298 U JP H065298U
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- Prior art keywords
- magnetic
- frame
- magnetic flux
- magnetic circuit
- leakage
- 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.)
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Abstract
(57)【要約】
【目的】 漏洩磁束を収束し、所望の空間に対して完全
に防磁を図る低漏洩磁束型スピーカを得ること。
【構成】 非磁性体から成るフレームの、主として磁気
回路の近傍を除く側面部に磁性体の薄板、若しくは２枚
の磁性体薄板と非磁性体とから成るサンドイッチ構造の
磁気遮蔽板を配置した構造のスピーカ。
(57) [Abstract] [Purpose] To obtain a low-leakage magnetic flux type speaker that converges leakage magnetic flux and completely shields a desired space. [Structure] A structure in which a magnetic thin plate or a sandwich magnetic shield plate composed of two thin magnetic plates and a non-magnetic substance is arranged on a side surface of a frame made of a non-magnetic substance except mainly near the magnetic circuit. Speaker.
Description
【０００１】[0001]
本考案は、磁気回路からの磁束の漏洩を極力防止し、漏洩磁束が周辺機器に与 える悪影響を除外した低漏洩磁束型スピーカの構造に関する。 The present invention relates to a structure of a low-leakage magnetic flux type speaker in which leakage of magnetic flux from a magnetic circuit is prevented as much as possible and the adverse effect of the leakage magnetic flux on peripheral devices is eliminated.
【０００２】[0002]
従来における低漏洩磁束型スピーカの代表的な構造は、例えば図４に示す如く 、(1) リング状の前プレート11と中心にセンターポール12を突設した後プレート 14との間にリング状の磁石13を挟持させた、周知の構造の外磁型磁気回路の背面 に逆極性のキャンセル磁石15を結合し、磁気回路全体を磁性体シールド16で覆っ た防磁型磁気回路10をフレーム17の前面に取付け、当該フレーム17の周縁部に振 動板18を接着し、この振動板18に前記磁気回路10の磁気空隙に嵌まり込むボイス コイル19を結合してなる構造、(2) 防磁型磁気回路10の前面に取付けられるフレ ーム17が非磁性体からなる構造（図示せず）等が実用化されている。 A typical structure of a conventional low-leakage magnetic flux type speaker is, for example, as shown in FIG. 4, (1) a ring-shaped front plate 11 and a ring-shaped front plate 11 having a center pole 12 protruding from the center thereof. The anti-magnetism type magnetic circuit 10 in which the canceling magnet 15 of the opposite polarity is coupled to the back side of the outer magnet type magnetic circuit of the well-known structure in which the magnet 13 is sandwiched, and the entire magnetic circuit is covered by the magnetic shield 16 is arranged in front of the frame 17. Attached to the periphery of the frame 17, a vibration plate 18 is adhered to the frame 17, and a voice coil 19 that fits into the magnetic gap of the magnetic circuit 10 is connected to the vibration plate 18. A structure (not shown) in which the frame 17 attached to the front surface of the circuit 10 is made of a non-magnetic material has been put into practical use.
【０００３】[0003]
この様な構造を有する従来の低漏洩磁束型スピーカは、前者の構造に於ては磁 性体シールド16端部や前プレート11上面等の磁気回路10から漏洩した磁束がフレ ーム17に誘導されて周辺部空間に広がったり、後者の構造では磁気回路10からの 漏洩と共に磁気空隙からの漏洩も加わって、漏洩磁束密度が高くなるという解決 すべき課題があった。 In the conventional low-leakage magnetic flux type speaker having such a structure, in the former structure, the magnetic flux leaked from the magnetic circuit 10 such as the end of the magnetic shield 16 and the upper surface of the front plate 11 is induced in the frame 17. Therefore, there is a problem to be solved in that the leakage magnetic flux density becomes high due to the leakage of the magnetic circuit 10 and the leakage from the magnetic circuit 10 in the latter structure.
【０００４】 そこで本考案は、一部分が導磁性であるフレームを使用して漏洩磁束を収束し 、所望の空間に対して完全に防磁を図る低漏洩磁束型スピーカを提供することを 目的とする。Therefore, an object of the present invention is to provide a low-leakage magnetic flux type speaker that uses a frame part of which is magnetically conductive to converge the leakage magnetic flux and completely shield the desired space.
【０００５】[0005]
上記目的を達成するための本考案に係る低漏洩磁束型スピーカは、実施例を示 す図１〜図３を用いて説明すると、第１考案は、図１に縦断面を示し、合成樹脂 からなり且つ磁気回路近傍を除く脚部1b、周円部1c等の側面部に磁性体６が埋設 されているフレーム１の下面に磁気回路３が結合されると共に、前記フレーム１ の周縁部に振動板４を接着し、この振動板４に前記磁気回路３の磁気空隙に嵌ま り込むボイスコイル５を結合してなる低漏洩磁束型スピーカである。 A low-leakage magnetic flux type speaker according to the present invention for achieving the above object will be described with reference to FIGS. 1 to 3 showing an embodiment. The first invention shows a longitudinal section in FIG. The magnetic circuit 3 is coupled to the lower surface of the frame 1 in which the magnetic material 6 is embedded in the side surfaces of the leg portion 1b, the circumferential circle portion 1c, etc. except for the vicinity of the magnetic circuit, and the vibration is generated in the peripheral portion of the frame 1. This is a low-leakage magnetic flux type speaker in which a plate 4 is adhered and a voice coil 5 which is fitted into the magnetic gap of the magnetic circuit 3 is connected to the vibrating plate 4.
【０００６】 第２考案は、図２に縦断面を示し、非磁性体からなり且つ磁気回路近傍を除く 脚部1b、周円部1c等の側面部に磁性体薄板６が貼着されているフレーム１の下面 に磁気回路３が結合されると共に、前記フレームの周縁部に振動板４を接着し、 この振動板４に前記磁気回路３の磁気空隙に嵌まり込むボイスコイル５を結合し てなる低漏洩磁束型スピーカである。The second invention shows a vertical cross section in FIG. 2, and a magnetic thin plate 6 is attached to the side surface portion such as the leg portion 1b and the circumferential circle portion 1c which are made of a non-magnetic material and excluding the vicinity of the magnetic circuit. The magnetic circuit 3 is coupled to the lower surface of the frame 1, and the diaphragm 4 is adhered to the peripheral portion of the frame, and the voice coil 5 fitted in the magnetic gap of the magnetic circuit 3 is coupled to the diaphragm 4. It is a low leakage magnetic flux type speaker.
【０００７】 第３考案は、非磁性体からなり且つ磁気回路近傍を除く脚部1b、周円部1c等の 側面部に磁性体薄板６と第２の磁性体薄板８との間に非磁性体７を挟んだ磁気遮 蔽板９が貼着されているフレーム１の下面に磁気回路３が結合されると共に、前 記フレーム１の周縁部に振動板４を接着し、この振動板４に前記磁気回路３の磁 気空隙に嵌まり込むボイスコイル５を結合してなる低漏洩磁束型スピーカである 。The third invention is a non-magnetic material, which is made of a non-magnetic material and is provided between the magnetic thin plate 6 and the second magnetic thin plate 8 on the side surface portion such as the leg portion 1b and the circumferential circle portion 1c except for the vicinity of the magnetic circuit. The magnetic circuit 3 is coupled to the lower surface of the frame 1 to which the magnetic shield 9 sandwiching the body 7 is attached, and the diaphragm 4 is adhered to the peripheral portion of the frame 1 described above. It is a low-leakage magnetic flux type loudspeaker in which a voice coil 5 fitted in a magnetic space of the magnetic circuit 3 is coupled.
【０００８】[0008]
そして、この様な構成の低漏洩磁束型スピーカでは、フレームの磁気回路近傍 が非磁性体であるから磁束を誘導して漏洩磁束として空間に広げ、当該空間の漏 洩磁束密度を高めることはない。 In the low-leakage magnetic flux type speaker having such a configuration, since the vicinity of the magnetic circuit of the frame is a non-magnetic material, the magnetic flux is not induced and spread as a leakage magnetic flux into the space, and the leakage magnetic flux density of the space is not increased. .
【０００９】 又、磁気回路の前面、側面から周囲の空間に漏出した僅かの漏洩磁束は、フレ ーム前方側面に設けられた磁性体２又は磁性体薄板６或いは磁気遮蔽板９に吸収 されて、スピーカ側方空間には存在しなくなる。従って、スピーカ側部近傍に取 付けられているブラウン管等に対し、漏洩磁束に因る画面の色ずれ等の悪影響を 無くすることができる。A small amount of leakage magnetic flux leaked from the front and side surfaces of the magnetic circuit to the surrounding space is absorbed by the magnetic body 2, the magnetic thin plate 6 or the magnetic shield plate 9 provided on the front side surface of the frame. , No longer exists in the space beside the speaker. Therefore, it is possible to eliminate adverse effects such as color shift of the screen due to the leakage magnetic flux on the cathode ray tube and the like mounted near the speaker side portion.
【００１０】[0010]
図１〜図３により、本考案の実施例を詳述すると、図１は本考案の第１考案の 実施例の縦断面を示し、１は合成樹脂からなるフレームで、磁気回路３の近傍を 除く脚部1bと周縁部1cを含む側面部1aに薄板状の磁性体２が埋設されている。磁 性体２は本実施例では鉄板が使用されているが、同じような高導磁率を有する物 質であればどの様な材質であっても良い。磁性体２の埋設はフレーム１の成形時 に一体成形することによって得られる。 An embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3. FIG. 1 shows a longitudinal section of an embodiment of the first invention of the present invention. A thin plate-shaped magnetic body 2 is embedded in the side surface portion 1a including the excluding leg portion 1b and the peripheral edge portion 1c. An iron plate is used for the magnetic body 2 in this embodiment, but any material may be used as long as it has a similar high magnetic permeability. The magnetic body 2 is embedded by being integrally molded when the frame 1 is molded.
【００１１】 フレーム１の下面に、リング状の前プレート3aと中心にセンターポール3cを突 設した後プレート3bとの間にリング状の磁石3dを挟持させた、周知の構造の外磁 型磁気回路の背面に逆極性のキャンセル磁石3eを結合し、磁気回路全体を磁性体 シールド3fで覆って防磁型とした磁気回路３が結合されると共に、前記フレーム １の周縁部に振動板４を接着し、この振動板４に前記磁気回路３の磁気空隙に嵌 まり込むボイスコイル５を結合してなる振動系が組込まれている。An outer magnet type magnet having a well-known structure in which a ring-shaped magnet 3d is sandwiched between a ring-shaped front plate 3a and a rear plate 3b having a center pole 3c protruding from the center on the lower surface of the frame 1. The canceling magnet 3e having the opposite polarity is coupled to the back surface of the circuit, and the magnetic circuit 3 which is magnetically shielded by covering the entire magnetic circuit with the magnetic shield 3f is coupled, and the vibrating plate 4 is bonded to the peripheral portion of the frame 1. An oscillating system, in which a voice coil 5 fitted in a magnetic gap of the magnetic circuit 3 is coupled to the vibrating plate 4, is incorporated.
【００１２】 図２は本考案の第２考案の実施例の要部縦断面を示し、非磁性体からなるフレ ーム１の前記第１実施例と同じ部位に、パーマロイの様な高導磁率を示す物質か ら成る磁性体薄板６が貼着されている。フレーム１の下面に磁気回路３並びに振 動系等は第１実施例と同じである。FIG. 2 is a longitudinal sectional view of an essential part of an embodiment of the second invention of the present invention. In the same portion of the frame 1 made of a non-magnetic material as in the first embodiment, a high magnetic permeability such as permalloy is provided. The magnetic thin plate 6 made of a substance showing is attached. The magnetic circuit 3 and the vibration system on the lower surface of the frame 1 are the same as in the first embodiment.
【００１３】 本第２の実施例では、磁性体薄板６はフレームの脚部に貼着されているが、フ レームの窓部に橋架する様にして設置しても良い。一般にスピーカ近傍に配設さ れている磁気漏洩を最も忌避する物体に近接した側のスピーカの側面に貼着する ことが望ましい。In the second embodiment, the magnetic thin plate 6 is attached to the leg portion of the frame, but it may be installed so as to bridge the window portion of the frame. In general, it is desirable to attach it to the side surface of the speaker, which is located near the speaker and is closest to the object that most repels magnetic leakage.
【００１４】 この第２の実施例は、第１実施例と比較して例えば金属製のダイキャストフレ ームの如く、インサートが不可能なフレームにも適用できるとともに、磁性体薄 板６をフレーム１の最も効果的な位置に接着できるという特徴を有している。Compared to the first embodiment, the second embodiment can be applied to a frame that cannot be inserted, such as a die-cast frame made of metal, and the magnetic thin plate 6 can be used as a frame. It has the feature that it can be bonded to the most effective position of 1.
【００１５】 図３は本考案の第３考案の実施例の要部縦断面を示し、フレーム１の前記第１ 実施例と同じ部位に、パーマロイの様な高導磁率を示す物質からなる磁性体薄板 ６と同じ様な磁性体薄板８及び非磁性材料７とがサンドゥイッチ状に積層された 磁気遮蔽版９が貼着されている。FIG. 3 is a longitudinal sectional view of an essential part of an embodiment of the third invention of the present invention. In the same portion of the frame 1 as that of the first embodiment, a magnetic body made of a substance having a high magnetic permeability such as permalloy. A magnetic shielding plate 9 in which a magnetic thin plate 8 and a non-magnetic material 7 similar to the thin plate 6 are laminated in a sandwich shape is attached.
【００１６】 この第３実施例は、前述の第１実施例ならびに第２実施例と比較して、非磁性 材料７によってフレームから浮いた状態で貼着された磁性体薄板８がシールド板 として作用し、僅かに残っていた漏洩磁束を吸収するので防磁効果は一層完全に なるという特徴を有する。In the third embodiment, as compared with the first and second embodiments described above, the magnetic thin plate 8 adhered by the non-magnetic material 7 while being floated from the frame acts as a shield plate. However, it has a feature that the magnetic flux shielding effect is further perfected because it absorbs a small amount of leakage magnetic flux.
【００１７】 更に上記第３の実施例の変形例として、前記第１の実施例における磁性体を埋 設した部位の表面に、磁性体薄板を貼着しても同一の作用と効果を得ることがで き、本願の技術範囲に属する。Further, as a modified example of the third embodiment, the same action and effect can be obtained even if a magnetic thin plate is attached to the surface of the portion in which the magnetic body is embedded in the first embodiment. However, it belongs to the technical scope of the present application.
【００１８】 以上、本考案に係る低漏洩磁束型スピーカについて代表的と思われる実施例を 基に詳述したが、本考案による低漏洩磁束型スピーカの実施態様は、上記実施例 の構造に限定されるものではなく、例えば、磁性体或いは磁気遮蔽板の貼着位置 等において、図示したフレーム脚部以外にも、窓の部位に橋渡しする如くに接地 してあっても同一の作用、効果を得ることが出来、前記した実用新案登録請求の 範囲に記載の構成要件を具備し、本考案にいう作用を呈し、以下に述べる効果を 有する限りにおいて、適宜改変して実施しうるものである。The low leakage magnetic flux type speaker according to the present invention has been described above in detail based on an example considered to be typical. However, the embodiment of the low leakage magnetic flux type speaker according to the present invention is limited to the structure of the above embodiment. For example, at the position where the magnetic material or the magnetic shield plate is attached, the same action and effect can be obtained even if the grounding is done so as to bridge the window part other than the frame leg part shown in the figure. The present invention can be appropriately modified and implemented as long as it can be obtained, has the constituents described in the above-mentioned utility model registration claim, exhibits the action referred to in the present invention, and has the effects described below.
【００１９】[0019]
本考案に係る低漏洩磁束型スピーカは以下に述べる効果を有する。 フレームの磁気回路近傍が非磁性体であるから磁束を誘導して周辺空間の漏洩磁 束密度を高めることはなく、磁気回路の前面、側面から周囲の空間に漏出した僅 かの漏洩磁束は、フレーム前方側面に設けられた磁性体等に吸収されてスピーカ 側方空間の漏洩磁束密度は低下し、ブラウン管等磁気の影響を受けやすい物体を 画面の色ずれ等の悪影響から保護することが出来る。 The low-leakage magnetic flux type speaker according to the present invention has the following effects. Since the vicinity of the magnetic circuit of the frame is a non-magnetic material, it does not induce the magnetic flux to increase the leakage flux density in the surrounding space, and the slight leakage flux leaked from the front and side surfaces of the magnetic circuit to the surrounding space is The magnetic flux provided on the front side of the frame absorbs the magnetic flux density in the side space of the speaker, which reduces the leakage magnetic flux density of the speaker.
【００２０】 図５に、第１考案の実施例と従来例との各スピーカ近傍の漏洩磁束密度を示す 。いずれも図６に示す様にスピーカ側面から１０ｍｍ離れたスピーカ軸に平行な 軸線上で、スピーカ前面から後方に沿った位置の漏洩磁束密度の変化を示し、実 線は第１考案の実施例、点線は従来例スピーカの測定結果である。スピーか前面 から後方３０ｍｍ程度の範囲の漏洩磁束密度が大きく低下し、３０ｍｍより後方 に隔たった空間でもある程度低くなっていることから、本考案の防磁構造の効果 が明瞭である。FIG. 5 shows the leakage magnetic flux densities in the vicinity of the speakers of the embodiment of the first invention and the conventional example. As shown in FIG. 6, the changes in the leakage magnetic flux density are shown in FIG. 6 along the axis parallel to the speaker axis 10 mm away from the side surface of the speaker. The dotted line is the measurement result of the conventional speaker. The magnetic flux density in the range of about 30 mm behind the front or from the speed is greatly reduced, and it is also reduced to some extent in the space separated from the rear of 30 mm, so that the effect of the magnetic shield structure of the present invention is clear.
【００２１】 更に又、第１実施例のような構成では磁性体と合成樹脂とを一体成形すること により、生産性を高めることができ、防磁性能が優れたスピーカを安価に提供で きるという効果を有するものである。Furthermore, in the configuration as in the first embodiment, the magnetic body and the synthetic resin are integrally molded, so that the productivity can be increased and the speaker having excellent magnetic shielding performance can be provided at a low cost. Is to have.
【図１】本考案第１考案の実施例の断面図。FIG. 1 is a sectional view of an embodiment of the first invention of the present invention.
【図２】第２考案の実施例の要部断面図。FIG. 2 is a sectional view of an essential part of an embodiment of the second invention.
【図３】第３考案の実施例の要部断面図。FIG. 3 is a sectional view of an essential part of an embodiment of a third invention.
【図４】代表的な従来例の断面図。FIG. 4 is a cross-sectional view of a typical conventional example.
【図５】第１考案の実施例と従来例との各スピーカ近傍
の漏洩磁束密度を比較して示すグラフ。FIG. 5 is a graph showing a comparison of leakage magnetic flux densities in the vicinity of each speaker in the example of the first invention and the conventional example.
１ フレーム ２ 磁性体 ３ 磁気回路 ４ 振動板 ５ ボイスコイル ６ 磁性体薄板 ７ 非磁性体 ８ 第２の磁性体薄板 ９ 磁気遮蔽板 1 frame 2 magnetic body 3 magnetic circuit 4 diaphragm 5 voice coil 6 magnetic thin plate 7 non-magnetic body 8 second magnetic thin plate 9 magnetic shield plate
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【手続補正書】[Procedure amendment]
【提出日】平成５年６月３０日[Submission date] June 30, 1993
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】図面の簡単な説明[Name of item to be corrected] Brief description of the drawing
【補正方法】追加[Correction method] Added
【補正内容】[Correction content]
【図６】漏洩磁束密度測定方法の説明図。FIG. 6 is an explanatory diagram of a leakage magnetic flux density measuring method.
Claims (3)
く脚部、周縁部等の側面部に磁性体（２）が埋設されて
いるフレーム（１）の下面に防磁型の磁気回路（３）が
結合されると共に、前記フレーム（１）の周縁部に振動
板（４）を接着し、この振動板（４）に前記磁気回路
（３）の磁気空隙に嵌まり込むボイスコイル（５）を結
合してなる低漏洩磁束型スピーカ。1. A magnetic circuit (3) of a magnetic shield type on the lower surface of a frame (1) which is made of synthetic resin and has a magnetic body (2) embedded in side portions such as legs and peripheral portions except the vicinity of the magnetic circuit. And a vibration coil (4) is adhered to the periphery of the frame (1), and a voice coil (5) fitted in the magnetic gap of the magnetic circuit (3) is attached to the vibration plate (4). A low-leakage magnetic flux type speaker that is connected.
く脚部、周縁部等の側面部に磁性体薄板（６）が貼着さ
れているフレーム（１）の下面に磁気回路（３）が結合
されると共に、前記フレームの周縁部に振動板（４）を
接着し、この振動板（４）に前記磁気回路（３）の磁気
空隙に嵌まり込むボイスコイル（５）を結合してなる低
漏洩磁束型スピーカ。2. A magnetic circuit (3) is formed on the lower surface of a frame (1), which is made of a non-magnetic material and has a magnetic thin plate (6) adhered to side surfaces such as legs and peripheral portions except the vicinity of the magnetic circuit. And a vibration plate (4) is bonded to the peripheral portion of the frame, and a voice coil (5) fitted in the magnetic gap of the magnetic circuit (3) is connected to the vibration plate (4). Low leakage magnetic flux type speaker.
く脚部、周縁部等の側面部に磁性体薄板（６）と第２の
磁性体薄板（８）との間に非磁性体（７）を挟んだ磁気
遮蔽板（９）が貼着されているフレーム（１）の下面に
磁気回路（３）が結合されると共に、前記フレーム
（１）の周縁部に振動板（４）を接着し、この振動板
（４）に前記磁気回路（３）の磁気空隙に嵌まり込むボ
イスコイル（５）を結合してなる低漏洩磁束型スピー
カ。3. A non-magnetic material (6) and a second magnetic material thin plate (8) which are made of a non-magnetic material and are provided on a side surface portion such as a leg portion, a peripheral edge portion and the like excluding the vicinity of the magnetic circuit. The magnetic circuit (3) is coupled to the lower surface of the frame (1) to which the magnetic shield plate (9) sandwiching 7) is adhered, and the diaphragm (4) is attached to the peripheral portion of the frame (1). A low-leakage magnetic flux type loudspeaker in which a voice coil (5) which is adhered and fitted into the magnetic gap of the magnetic circuit (3) is bonded to the diaphragm (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9375391U JPH065298U (en) | 1991-10-18 | 1991-10-18 | Low leakage magnetic flux type speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9375391U JPH065298U (en) | 1991-10-18 | 1991-10-18 | Low leakage magnetic flux type speaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH065298U true JPH065298U (en) | 1994-01-21 |
Family
ID=14091193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9375391U Pending JPH065298U (en) | 1991-10-18 | 1991-10-18 | Low leakage magnetic flux type speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH065298U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5322524U (en) * | 1976-08-04 | 1978-02-25 | ||
| JPS5338822U (en) * | 1976-09-09 | 1978-04-05 | ||
| WO2005089015A1 (en) * | 2004-03-11 | 2005-09-22 | Matsushita Electric Industrial Co., Ltd. | Speaker, module employing it, electronic apparatus and device |
-
1991
- 1991-10-18 JP JP9375391U patent/JPH065298U/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5322524U (en) * | 1976-08-04 | 1978-02-25 | ||
| JPS5338822U (en) * | 1976-09-09 | 1978-04-05 | ||
| WO2005089015A1 (en) * | 2004-03-11 | 2005-09-22 | Matsushita Electric Industrial Co., Ltd. | Speaker, module employing it, electronic apparatus and device |
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