JPH01101796A - Speaker - Google Patents

Abstract

PURPOSE:To improve the efficiency of a speaker without incurring increased volume and weight in a speaker drive part by arranging an exciting superconduction coil in a way that magnetic flux crosses the superconduction coil forming a closed loop so as to constitute a magnet. CONSTITUTION:The superconduction coil 11 and the exciting superconduction coil 12 forming a closed loop are arranged concentrically to a center pole 16. At first, the temperature of the speaker drive part is set so that the superconduction coil 11 forming a closed loop is in the normal conduction state and the exciting coil 12 is in the superconduction state. Then a switch 22 is closed to give a current to the exciting superconduction coil 12 to generate a strong magnetic field. Then the speaker drive part is cooled to a temperature at which the superconduction coil 11 forming a closed loop shows the superconduction and then the switch 22 is opened, a permanent current flows through the superconduction coil 11 forming the closed loop thereby forming a strong magnet. Thus, the efficiency of the speaker is improved without incurring the increase in the weight and volume of the speaker drive part.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は音響再生装置に用いることができるスピーカに
関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a speaker that can be used in a sound reproduction device.

従来の技術 従来、スピーカのマグネットはフェライト等の磁性体よ
り構成されている。2. Description of the Related Art Conventionally, speaker magnets are made of a magnetic material such as ferrite.

以下図面を参照しながら上述した従来のスピーカの一例
について説明する。An example of the conventional speaker mentioned above will be described below with reference to the drawings.

第３図は従来のスピーカ駆動部分の断面を示すものであ
る。第３図において、１３はボイスコイル、１５はスピ
ーカコーン、１６はセンタボール、３１はトッププレー
ト、３２はバンクプレート、３３はリング状マグネット
である。FIG. 3 shows a cross section of a conventional speaker driving portion. In FIG. 3, 13 is a voice coil, 15 is a speaker cone, 16 is a center ball, 31 is a top plate, 32 is a bank plate, and 33 is a ring-shaped magnet.

以上のように構成されたスピーカについて、以下その動
作について説明する。The operation of the speaker configured as above will be described below.

まず、マグネット３３には着磁せず第３図に示すように
組み立て、その後、着磁装置によりマグネット３３に着
磁を行なう。この結果、トッププレート３１とセンタボ
ール１６間に磁束が流れ、ボイスコイル１３に電気信号
の電流を流せば、ボイスコイル１３が上下に振動し、ス
ピーカコーン１５から振動音が発生するようになってい
る。First, the magnet 33 is assembled as shown in FIG. 3 without being magnetized, and then the magnet 33 is magnetized by a magnetizing device. As a result, a magnetic flux flows between the top plate 31 and the center ball 16, and when an electric signal current is passed through the voice coil 13, the voice coil 13 vibrates up and down, and vibration sound is generated from the speaker cone 15. There is.

発明が解決しようとする問題点 しかしながら上記のような構成において、電気信号から
音響エネルギへの変換能率向上にはマグネットを大きく
しなければならないため、スピーカ駆動部の重量と体積
の増大化という問題を有していた。Problems to be Solved by the Invention However, in the above configuration, the size of the magnet must be increased in order to improve the conversion efficiency from electrical signals to acoustic energy. had.

本発明は上記問題点に鑑み、スピーカ駆動部の重量と体
積の増大化を招（ことなく上記変換能率向上が可能なス
ピーカを提供するものである。In view of the above problems, the present invention provides a speaker in which the conversion efficiency can be improved without increasing the weight and volume of the speaker drive section.

問題点を解決するための手段 上記問題点を解決するために本発明のスピーカは閉ルー
プをなす超電導コイルと、外部電源より電流が供給でき
、また、超電導を示す臨界温度が前記超電導コイルより
高い温度を示す励磁用超電導コイルとを備え、前記閉ル
ープをなす超電導コイル内を磁束を横切るように前記励
磁用超電導コイルを配置し、超電導を利用したマグネッ
トを構成している。Means for Solving the Problems In order to solve the above problems, the speaker of the present invention includes a superconducting coil forming a closed loop, a current can be supplied from an external power source, and a critical temperature indicating superconductivity is higher than that of the superconducting coil. The superconducting coil for excitation is arranged so as to cross the magnetic flux inside the superconducting coil forming the closed loop, thereby forming a magnet using superconductivity.

作用 本発明は上記した構成によって、閉ループをなす超電導
コイルは常電導状態を、励磁コイルは超電導状態を示す
ようにスピーカ駆動部の温度を設定後、励磁用超電導コ
イルに外部電源より電流を供給し、強力な磁界を発生さ
せる０次に、閉ループをなす超電導コイルが超電導状態
となる温度にスピーカ駆動部を冷却し、励磁用超電導コ
イルの電流を切る。その結果、閉ループをなす超電導コ
イルに磁束の捕獲がなされる。このようにして、閉ルー
プをなす超電導コイルに永久電流を流し、強力な磁界を
発生させ、マグネットの機能を持たせることにより、ス
ピーカ駆動部の重量と体積の増大化を招くことなく、ス
ピーカの能率を向上することができる。According to the above-described configuration, the present invention supplies current from an external power supply to the excitation superconducting coil after setting the temperature of the speaker drive section so that the closed loop superconducting coil is in a normal conductive state and the excitation coil is in a superconducting state. Next, the speaker drive section is cooled to a temperature at which the closed loop superconducting coil becomes superconducting, and the current in the excitation superconducting coil is cut off. As a result, magnetic flux is captured in the superconducting coil forming a closed loop. In this way, a persistent current is passed through the superconducting coil that forms a closed loop, generating a strong magnetic field and giving it the function of a magnet, thereby increasing the efficiency of the speaker without increasing the weight and volume of the speaker drive unit. can be improved.

実施例 以下本発明の一実施例のスピーカについて、図面を参照
しながら説明する。EXAMPLE Hereinafter, a speaker according to an example of the present invention will be described with reference to the drawings.

第１図は、本発明の一実施例におけるスピーカの断面を
示すものである。第１図において、１１は閉ループをな
す超電導コイル、１２は超電導コイル１１より超電導を
示す臨界温度が高い励磁用超電導コイルである。１３は
ボイスコイル、１４はヨーク、１５はスピーカコーン、
１６はセンタボールである。FIG. 1 shows a cross section of a speaker in one embodiment of the present invention. In FIG. 1, 11 is a superconducting coil forming a closed loop, and 12 is an excitation superconducting coil whose critical temperature indicating superconductivity is higher than that of superconducting coil 11. 13 is a voice coil, 14 is a yoke, 15 is a speaker cone,
16 is a center ball.

第２図は超電導コイル１１及び１２の電気的接続を示す
図である。２１は励磁用超電導コイル１２に電流を流す
電源である。２２は励磁用超電導コイル１２に流れる電
流の切断をするスイッチである。FIG. 2 is a diagram showing the electrical connection of superconducting coils 11 and 12. Reference numeral 21 denotes a power source that supplies current to the superconducting coil 12 for excitation. 22 is a switch that cuts off the current flowing through the excitation superconducting coil 12.

以上のように構成されたスピーカについて、以下第１図
、第２回を用いてその動作を説明する。The operation of the speaker configured as described above will be explained below using FIG. 1 and Part 2.

第１図に示すごとく、閉ループをなす超電導コイル１１
と励磁用超電導コイル１２をセンタボール１６に同心円
状に配置する。まず、閉ループをなす超電導コイル１１
が常電導状態を、励磁コイル１２が超電導状態を示すよ
うにスピーカ駆動部の温度を設定する。次に、第２図の
スイッチ２２を閉じ、励磁用超電導コイル１２に電流を
流し、強力な磁界を発生させる。そして、スピーカ駆動
部を閉ループをなす超電導コイル１１が超電導を示す温
度まで冷却する。その後、スイッチ２２を開き、外部電
源２１を取り去る。この結果、閉ループをなす超電導コ
イル１１には永久電流が流れ、強力なマグネットが形成
される。As shown in Fig. 1, a superconducting coil 11 forming a closed loop
The excitation superconducting coil 12 is arranged concentrically around the center ball 16. First, the superconducting coil 11 forming a closed loop
The temperature of the speaker drive unit is set so that the excitation coil 12 is in a normal conducting state and the exciting coil 12 is in a superconducting state. Next, the switch 22 shown in FIG. 2 is closed, and current is passed through the excitation superconducting coil 12 to generate a strong magnetic field. Then, the speaker drive section is cooled to a temperature at which the superconducting coil 11 forming a closed loop exhibits superconductivity. Thereafter, the switch 22 is opened and the external power supply 21 is removed. As a result, a persistent current flows through the superconducting coil 11 forming a closed loop, forming a strong magnet.

発明の効果 以上のように本発明は閉ループをなす超電導コイルと、
外部電源より電流が供給でき、また超電導を示す臨界温
度が前記超電導コイルより高い温度を示す励磁用超電導
コイルとを備え、前記閉ループをなす超電導コイル内を
磁束が横切るように前記励磁用超電導コイルを配置し、
マグネットを構成させることにより、スピーカ駆動部を
重量と体積の増大化を招くことなく、スピーカの能率を
向上させることができる。Effects of the Invention As described above, the present invention provides a closed loop superconducting coil,
An excitation superconducting coil that can be supplied with current from an external power source and has a critical temperature indicating superconductivity higher than that of the superconducting coil, and the excitation superconducting coil is arranged such that a magnetic flux crosses within the superconducting coil forming the closed loop. place,
By configuring the magnet, the efficiency of the speaker can be improved without increasing the weight and volume of the speaker drive section.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の実施例におけるスピーカ駆動部の断面
図、第２図は超電導コイルの電気的接続関係を示す構成
図、第３図は従来のスピーカ駆動部の断面図である。 １１・・・・・・閉ループをなす超電導コイル、１２・
・・・・・超電導コイルより超電導を示す臨界温度が高
い励磁用超電導コイル、１３・・・・・・ボイスコイル
、１４・・・・・・ヨーク、１５・・・・・・スピーカ
コーン、１６・・・・・・センタボール。 代理人の氏名　弁理士　中尾敏男　はか１名！３−−−
ボ（スフ４ル 樽−−−ヨーク ＋５−−−スピー刀コーノ ＋１−−−１ツタ−ｊζ−ル 第　２　図 第３図FIG. 1 is a sectional view of a speaker drive section according to an embodiment of the present invention, FIG. 2 is a configuration diagram showing the electrical connections of superconducting coils, and FIG. 3 is a sectional view of a conventional speaker drive section. 11... Superconducting coil forming a closed loop, 12.
...Excitation superconducting coil whose critical temperature indicating superconductivity is higher than that of the superconducting coil, 13...Voice coil, 14...Yoke, 15...Speaker cone, 16・・・・・・Center ball. Name of agent: Patent attorney Toshio Nakao Haka1 person! 3---
Bo (Suf 4 barrel --- Yoke + 5 --- Speech sword Kono + 1 --- 1 Tsutar - jζ - 2nd figure 3rd figure

Claims (1)

【特許請求の範囲】[Claims] 閉ループをなす超電導コイルと、外部電源より電流が供
給でき、また超電導を示す臨界温度が前記超電導コイル
より高い温度を示す励磁用超電導コイルとを備え、前記
閉ループをなす超電導コイル内を磁束が横切るように前
記励磁用超電導コイルを配置し、マグネットを構成した
ことを特徴とするスピーカ。A superconducting coil forming a closed loop and an excitation superconducting coil to which a current can be supplied from an external power source and whose critical temperature indicating superconductivity is higher than that of the superconducting coil, such that magnetic flux crosses the superconducting coil forming the closed loop. A speaker characterized in that the excitation superconducting coil is arranged to constitute a magnet.