JPH05103393A - Magnetic circuit for loudspeaker - Google Patents
Magnetic circuit for loudspeakerInfo
- Publication number
- JPH05103393A JPH05103393A JP25891291A JP25891291A JPH05103393A JP H05103393 A JPH05103393 A JP H05103393A JP 25891291 A JP25891291 A JP 25891291A JP 25891291 A JP25891291 A JP 25891291A JP H05103393 A JPH05103393 A JP H05103393A
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- magnetic circuit
- magnetic
- speaker
- plate
- 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.)
- Pending
Links
Landscapes
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は動電形スピーカ用磁気回
路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic circuit for an electrodynamic speaker.
【０００２】[0002]
【従来の技術】近年、スピーカ市場では小型スピーカの
占める割合が大きなものとなっており、それに伴うスピ
ーカ用磁気回路の小型軽量化の要求が高まっている。現
在用いられているスピーカ用磁気回路は内磁型または外
磁型が一般的であるが、いずれの方式でも加工や着磁の
容易さからその表面が平板状の磁石が用いられている。2. Description of the Related Art In recent years, a small speaker occupies a large proportion in the speaker market, and accordingly, a demand for smaller and lighter magnetic circuit for a speaker is increasing. The magnetic circuit for a speaker currently used is generally an inner magnet type or an outer magnet type, but in any of these methods, a magnet having a flat plate surface is used because of its ease of processing and magnetization.
【０００３】以下に従来のスピーカ用磁気回路について
図面を参照しながら説明する。図４に示すように、スピ
ーカ磁気回路はセンターポール１、アンダープレート
２、ヨーク３、センターポール１と磁気ギャップをなす
トッププレート４、磁石５などで構成されている。そし
てセンターポール１とアンダープレート２とで平板状の
磁石５を挟み込む構成としている。A conventional speaker magnetic circuit will be described below with reference to the drawings. As shown in FIG. 4, the speaker magnetic circuit includes a center pole 1, an under plate 2, a yoke 3, a top plate 4 forming a magnetic gap with the center pole 1, a magnet 5, and the like. The center pole 1 and the under plate 2 sandwich the flat magnet 5.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら上記従来
の構成ではセンターポール１とアンダープレート２とで
平板状の磁石５を挟み込む構造のため、磁気ギャップ内
に十分な磁束密度を得るには磁石がかなり大きな断面積
を必要とし、その外径は大きなものとなる。その結果、
磁気回路全体の大きさと重量が大きくなり小型軽量化の
スピーカ実現することが困難であるという問題点を有し
ていた。However, in the above-mentioned conventional structure, since the flat pole-shaped magnet 5 is sandwiched between the center pole 1 and the under plate 2, the magnet is considerably large in order to obtain a sufficient magnetic flux density in the magnetic gap. It requires a large cross-sectional area and its outer diameter is large. as a result,
There is a problem in that it is difficult to realize a compact and lightweight speaker because the size and weight of the entire magnetic circuit increases.
【０００５】本発明は上記従来の問題点を解決するもの
で、磁石の外径を大きくすることなく、磁石とセンター
ポールやアンダープレートとの接合面積を増大させるこ
とで磁気回路に十分な磁束を供給し、磁気ギャップに必
要な磁束密度が得られるような小型軽量のスピーカ用磁
気回路を提供することを目的とする。The present invention solves the above-mentioned problems of the prior art. By increasing the joint area between the magnet and the center pole or the under plate without increasing the outer diameter of the magnet, a sufficient magnetic flux is generated in the magnetic circuit. It is an object of the present invention to provide a small and lightweight magnetic circuit for a speaker that supplies the magnetic flux density required for a magnetic gap.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に本発明のスピーカ用磁気回路は、磁石とセンターポー
ルおよび磁石とアンダープレートとの接合面を凹面また
は凸面あるいは凹凸面である構造として、磁石の外径を
大きくすることなく等価的に磁石とセンターポールやア
ンダープレートとの接合面積を増大させるような構成を
有している。In order to achieve the above object, the speaker magnetic circuit of the present invention has a structure in which the joint surface between the magnet and the center pole and the magnet and the under plate is a concave surface, a convex surface or an uneven surface. The structure is such that the joint area between the magnet and the center pole or the under plate is equivalently increased without increasing the outer diameter of the magnet.
【０００７】[0007]
【作用】本発明は上記した構成により、磁石の外径を大
きくすることなく、磁石とセンターポールやアンダープ
レートとの大きな接合面積をもつスピーカ用磁気回路を
提供し、小径の磁石にもかかわらず十分な磁束密度が得
られている。The present invention provides a speaker magnetic circuit having a large joint area between the magnet and the center pole or the under plate without increasing the outer diameter of the magnet by the above-described structure, and despite the small diameter of the magnet. Sufficient magnetic flux density is obtained.
【０００８】[0008]
【実施例】（実施例１）以下本発明の一実施例につい
て、図面を参照しながら説明する。(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.
【０００９】図１に示すように、センターポール６、ア
ンダープレート７、ヨーク８、センターポール６と磁気
ギャップをつくっているトッププレート９、磁石１０な
どでスピーカ用磁気回路はできている。As shown in FIG. 1, a magnetic circuit for a speaker is made up of a center pole 6, an under plate 7, a yoke 8, a top plate 9 forming a magnetic gap with the center pole 6, a magnet 10 and the like.
【００１０】以上のように、構成されたスピーカ用磁気
回路において、磁石１０を球面状とすることで磁石の外
径を拡大することなく、磁石１０とセンターポール６お
よびアンダープレート７との接合面積を拡大でき、磁気
回路に十分な磁束を供給し、磁気ギャップに必要な磁束
密度を得ることができ、磁気回路を小型軽量化できる。
また、磁石の磁化方向と着磁方向を磁石１０の球面の径
方向とすることで、より大きな磁束密度を得ることがで
きる。In the speaker magnetic circuit configured as described above, by making the magnet 10 spherical, the joint area between the magnet 10 and the center pole 6 and the under plate 7 can be achieved without increasing the outer diameter of the magnet. Can be expanded, a sufficient magnetic flux can be supplied to the magnetic circuit, the magnetic flux density required for the magnetic gap can be obtained, and the magnetic circuit can be reduced in size and weight.
Further, by setting the magnetizing direction and the magnetizing direction of the magnet to the radial direction of the spherical surface of the magnet 10, a larger magnetic flux density can be obtained.
【００１１】（実施例２）以下本発明の第２の実施例に
ついて図面を参照しながら説明する。(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.
【００１２】図２に示すように、第１の実施例と大きく
異なるのは、センターポール６と磁石１０の接合面およ
び磁石１０とアンダープレート７との接合面が円錐形あ
るいは角錐形をとる構造となっていることである。第２
の実施例も第１の実施例と同様に磁気回路を小型軽量化
できる。なお、磁石１０が円錐形の場合は、その磁化方
向と着磁方向を円錐面の法線方向とすることで、また角
錐形の場合は、その磁化方向と着磁方向を角錐面の法線
方向とすることでより大きな磁束密度が得られる。As shown in FIG. 2, the main difference from the first embodiment is that the joint surface between the center pole 6 and the magnet 10 and the joint surface between the magnet 10 and the under plate 7 are conical or pyramidal. That is. Second
In this embodiment, as in the first embodiment, the magnetic circuit can be reduced in size and weight. When the magnet 10 has a conical shape, the magnetization direction and the magnetization direction are set to the normal direction of the conical surface, and when the magnet 10 has a pyramid shape, the magnetization direction and the magnetization direction are set to the normal line of the pyramid surface. A larger magnetic flux density can be obtained by setting the direction.
【００１３】（実施例３）以下本発明の第３の実施例に
ついて図面を参照しながら説明する。(Embodiment 3) A third embodiment of the present invention will be described below with reference to the drawings.
【００１４】図３に示すように、第１および第２の実施
例と大きく異なるのは、センターポール６と磁石１０の
接合面および磁石１０とアンダープレート７との接合面
が波形をとる構造となっていることである。第３の実施
例も第１および第２の実施例と同様に磁気回路を小型軽
量化できる。なお、磁石１０の着磁方向を、波形を構成
している各面の法線方向とすることでより大きな磁束密
度が得られる。As shown in FIG. 3, the major difference from the first and second embodiments is that the joint surface between the center pole 6 and the magnet 10 and the joint surface between the magnet 10 and the under plate 7 are wavy. It has become. Also in the third embodiment, the magnetic circuit can be reduced in size and weight similarly to the first and second embodiments. It should be noted that a larger magnetic flux density can be obtained by setting the magnetizing direction of the magnet 10 to the normal direction of each surface forming the waveform.
【００１５】[0015]
【発明の効果】以上の実施例から明らかなように、本発
明は磁石とセンターポールおよびアンダープレートとの
接合面を凹凸面とすることにより、磁気回路の外径を拡
大することなく磁石の接合面積を拡大し、小型ながら磁
気ギャップ内に十分な磁束密度を得ることができる磁気
回路を提供するものであり、従来の平板状磁石を用いた
磁気回路では磁気ギャップ内に十分な磁束密度を得よう
とすると、磁石の外径を非常に大きくしなければならな
いという問題を解決できるもので、従来の磁気回路では
得られない小型で軽量な優れたスピーカ用磁気回路を実
現できるものである。As is apparent from the above embodiments, the present invention makes the joining surface of the magnet, the center pole and the under plate a concavo-convex surface to join the magnet without enlarging the outer diameter of the magnetic circuit. It provides a magnetic circuit that expands the area and can obtain a sufficient magnetic flux density in the magnetic gap in a small size.The magnetic circuit using the conventional flat magnet can obtain a sufficient magnetic flux density in the magnetic gap. In this case, the problem that the outer diameter of the magnet has to be made extremely large can be solved, and a small and lightweight excellent magnetic circuit for a speaker that cannot be obtained by a conventional magnetic circuit can be realized.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の第１の実施例のスピーカ用磁気回路の
断面図FIG. 1 is a sectional view of a magnetic circuit for a speaker according to a first embodiment of the present invention.
【図２】同第２の実施例のスピーカ用磁気回路の断面図FIG. 2 is a sectional view of a magnetic circuit for a speaker of the second embodiment.
【図３】同第３の実施例のスピーカ用磁気回路の断面図FIG. 3 is a sectional view of a magnetic circuit for a speaker according to the third embodiment.
【図４】従来のスピーカ用磁気回路の断面図FIG. 4 is a sectional view of a conventional magnetic circuit for a speaker.
６ センターポール ７ アンダープレート ８ ヨーク ９ トッププレート １０ 磁石 6 Center pole 7 Under plate 8 Yoke 9 Top plate 10 Magnet
Claims (6)
凹凸面のいずれかの形状をした構造を有するスピーカ用
磁気回路。1. A joint surface between a magnet and a plate is a concave surface, a convex surface,
A magnetic circuit for a speaker having a structure having an uneven surface.
構造を有する請求項１記載のスピーカ用磁気回路。2. The magnetic circuit for a loudspeaker according to claim 1, wherein the joint surface between the magnet and the plate has a spherical shape.
た構造を有する請求項１記載のスピーカ用磁気回路。3. A magnetic circuit for a speaker according to claim 1, wherein the joint surface between the magnet and the plate has a conical surface shape.
た構造を有する請求項１記載のスピーカ用磁気回路。4. The magnetic circuit for a speaker according to claim 1, wherein the joining surface between the magnet and the plate has a pyramidal surface structure.
構造を有する請求項１記載のスピーカ用磁気回路。5. The magnetic circuit for a speaker according to claim 1, wherein the joining surface between the magnet and the plate has a wavy structure.
石とプレートとの接合面の接面の法線方向になるように
配されたスピーカ用磁気回路。6. A magnetic circuit for a speaker arranged so that a magnetizing direction and a magnetizing direction of a magnet are in a direction normal to a contact surface of a bonding surface between the magnet and the plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25891291A JPH05103393A (en) | 1991-10-07 | 1991-10-07 | Magnetic circuit for loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25891291A JPH05103393A (en) | 1991-10-07 | 1991-10-07 | Magnetic circuit for loudspeaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05103393A true JPH05103393A (en) | 1993-04-23 |
Family
ID=17326760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25891291A Pending JPH05103393A (en) | 1991-10-07 | 1991-10-07 | Magnetic circuit for loudspeaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05103393A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003061337A1 (en) * | 2002-01-16 | 2003-07-24 | Matsushita Electric Industrial Co., Ltd. | Magnetic circuit for loudspeaker and loudspeaker comprising it |
-
1991
- 1991-10-07 JP JP25891291A patent/JPH05103393A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003061337A1 (en) * | 2002-01-16 | 2003-07-24 | Matsushita Electric Industrial Co., Ltd. | Magnetic circuit for loudspeaker and loudspeaker comprising it |
| US7149322B2 (en) | 2002-01-16 | 2006-12-12 | Matsushita Electric Industrial Co., Ltd. | Magnetic circuit for loudspeaker and loudspeaker comprising it |
| CN100353812C (en) * | 2002-01-16 | 2007-12-05 | 松下电器产业株式会社 | Magnetic circuit for loudspeaker and loudspeaker comprising it |
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