JP3542516B2

JP3542516B2 - Speaker and manufacturing method

Info

Publication number: JP3542516B2
Application number: JP06079999A
Authority: JP
Inventors: 純一早川
Original assignee: Kenwood KK
Current assignee: Kenwood KK
Priority date: 1999-03-08
Filing date: 1999-03-08
Publication date: 2004-07-14
Anticipated expiration: 2019-03-08
Also published as: JP2000261874A

Description

【０００１】
【発明の属する技術分野】
この発明は、スピーカに係り、詳しくはスピーカの作動中を発光によって知らせる発光電気素子を装備するスピーカ及びその製造方法に関するものである。
【０００２】
【従来の技術】
従来、スピーカへの入力をモニターするために、発光ダイオード等の発光電気素子にスピーカのボイスコイルへの入力電流の一部を流して、発光させている。また、発光電気素子は、スピーカの外に配置されている。
【０００３】
【発明が解決しようとする課題】
従来のスピーカにおける発光電気素子の取付上の問題点は次のとおりである。（ａ）ユーザへのアピール度（＝認識度）が低い。
（ｂ）発光電気素子の電力は、ボイスコイルの駆動電流の一部を利用しているため、発光電気素子をボイスコイルの給電回路へ接続する配線が必要になる。
【０００４】
なお、本出願人は、特願平１０−３３８９９０号において、発光電気素子を振動板部材の前面に取付けて、発光電気素子が振動板部材と一体に振動して、上述（ａ）の問題に対処することを開示している。しかしながら、特願平１０−３３８９９０号のスピーカは、（ｂ）の問題に全く対処し得ない。また、（ａ）の問題に対処するために、振動板部材を発光電気素子以外に配置することは開示していない。
【０００５】
この発明の目的は、上述の問題点（ａ）及び(ｂ)を同時に克服するスピーカ及び製造方法を提供することである。
【０００６】
【課題を解決するための手段】
この発明のスピーカ(10)は次のものを有している。
後面側の中央部に後方へ突出する筒部(24)をもつ振動板部材(11)
振動板部材(11)の筒部(24)に嵌装されて振動板部材(11)と一体に振動板部材(11)の軸方向へ変位しかつ駆動電流を供給されるボイスコイル(25)
ボイスコイル(25)を含む空間範囲に所定の磁界を生成する磁界生成装置(15,18,19)
ボイスコイル(25)への変動駆動電流の供給に因る誘導起電力を生成される電力生成コイル(32)
ボイスコイル(25)の前面側からボイスコイル(25)の領域内で発光が見えるように配置され電力生成コイル(32)からの電力により発光する発光電気素子(33a,33b)
【０００７】
ボイスコイル(25)は、通常は、筒部(24)の外周側に嵌装されるが、筒部(24)の内周側に嵌装されていてもよいとする。発光電気素子(33a,33b)の発光が振動板部材(11)の前面側からボイスコイル(25)の領域内で見えるようにするためには、発光電気素子(33a,33b)を振動板部材(11)の前面に取付ける場合、及び発光電気素子(33a,33b)を振動板部材(11)より後方に配置して、振動板部材(11)の一部に孔を設けたり、振動板部材(11)の一部又は全部を透明にしたりして、それら孔や透明部を介して発光電気素子(33a,33b)の発光を振動板部材(11)の前面側から見えるようにした場合を含む。なお、発光電気素子(33a,33b)の個数は１個又は複数個である。
【０００８】
ボイスコイル(25)への駆動電流は時間的に変動する結果、磁界生成装置(15,18,19)における磁束密度が変化し、磁界生成装置(15,18,19)には誘導起電力が生成される。これにより、発光電気素子(33a,33b)は、電力生成コイル(32)から電流を供給されて、発光する。また、発光電気素子(33a,33b)の発光は、ボイスコイル(25)の領域内でユーザに見られるので、ユーザの見る発光電気素子(33a,33b)の発光には、ボイスコイル(25)の振動の影響が現れ、ユーザへのアピール度が高まる。そして、発光電気素子(33a,33b)の電力を確保するために、ボイスコイル(25)による電力生成コイル(32)の誘導起電力が利用されるので、ボイスコイル(25)の駆動電流回路への発光電気素子(33a,33b)の接続配線を省略できる。
【０００９】
この発明の０スピーカ(10)によれば、電力生成コイル(32)は筒部(24)の内周側に配置され、円盤状磁性体(20)が電力生成コイル(32)の内周側に存在する。
【００１０】
電力生成コイル(32)の内周側における円盤状磁性体(20)の配置により、電力生成コイル(32)における磁束密度変化が増大し、電力生成コイル(32)の誘起電力が増大する。
【００１１】
この発明のスピーカ(10)によれば、磁界生成装置(15,18,19)は、筒部(24)の内周側に円柱状ヨーク部(17)を含み、円柱状ヨーク部(17)の頂部が円盤状磁性体(20)となっている。
【００１２】
円盤状磁性体(20)は円柱状ヨーク部(17)の一部として形成されているので、円盤状磁性体(20)の製作が容易となり、かつ構造が簡単化される。
【００１３】
この発明のスピーカ(10)によれば、円盤状磁性体(20)となる円柱状ヨーク部(17)の頂部は円柱状ヨーク部(17)の径縮小部(20)とされ、電力生成コイル(32)がボビン(31)の外周に嵌装され、ボビン(31)は、内周側において径縮小部(20)の周部に嵌合している。
【００１４】
ボビン(31)は円柱状ヨーク部(17)の頂部の径縮小部(20)に、例えば円柱状ヨーク部(17)の環状段部に当接するまで、嵌合されるので、スピーカ(10)における電力生成コイル(32)及びボビン(31)の組付け作業が簡単となる。
【００１５】
この発明のスピーカ(10)によれば、ボビン(31)の軸方向両端部は、発光電気素子(33a,33b)における電力生成コイル(32)の巻回部の両端より軸方向へ突出している。
【００１６】
ボビン(31)が電力生成コイル(32)の巻回部両端より軸方向両側はみ出ていることにより、電力生成コイル(32)の巻回部はボビン(31)の軸方向両側の部材への接触を回避され、電力生成コイル(32)の巻回部とその両端側の、例えば円柱状ヨーク部(17)等の導電体との短絡事故が防止される。
【００１７】
この発明のスピーカ(10)によれば、ダストキャップ(12)が、円柱状ヨーク部(17)の頂面を覆うように、振動板部材(11)の前面側中央部に装着され、発光電気素子(33a,33b)は、円柱状ヨーク部(17)の頂部に取付けられてダストキャップ(12)の後ろ側に配置され、発光電気素子(33a,33b)からの光が入射するダストキャップ(12)の部位には通孔部が設けられている。
【００１８】
発光電気素子(33a,33b)は、振動板部材(11)の後方側に配置されているにもかかわらず、ダストキャップ(12)の通孔部を介して振動板部材(11)の前面側から発光が視認可能になる。また、発光電気素子(33a,33b)は、振動板部材(11)に取付けられず、非振動の円柱状ヨーク部(17)に取付けられるので、発光電気素子(33a,33b)の固定は安定化される。なお、発光電気素子(33a,33b)が複数個の場合には、各発光電気素子(33a,33b)からの光の入射するダストキャップ(12)の各部位に通孔部が設けられる。
【００１９】
この発明のスピーカ(10)によれば、通孔部にはレンズ(37)が取付けられている。
【００２０】
通孔部が複数個ある場合には、各通孔部にレンズ(37)が取付けられる。ダストキャップ(12)の通孔部にレンズ(37)が取付けられることにより、発光電気素子(33a,33b)はダストキャップ(12)の後方にあるにもかかわらず、レンズ(37)自体が発光しているように、ユーザに認識され、アピール度が高まる。また、レンズ(37)が取付けられているダストキャップ(12)は振動板部材(11)の一部として振動するので、ユーザには、残像現象によりレンズ(37)の光が、点ではなく、線で見えるようになり，この点からもユーザへのアピール度が増大する。なお、発光電気素子(33a,33b)は、例えば゛発光ダイオード(37)であり、指向性の高い発光ダイオード(37)を使用して、その発光ダイオード(37)の光をレンズ(37)へ指向させると、レンズ(37)における光の明るさが増大して、大変、有利である。
【００２１】
この発明のスピーカ(10)によれば、発光電気素子は、発光色の相互に異なるものを複数個存在し、発光色の異なる発光電気素子同士は、相互に抵抗値の異なる抵抗体を介して電力生成コイル(32)へ接続され、通孔部は、複数個の発光電気素子からの光を共通に入射される寸法とされ、かつレンズを装着されている。
【００２２】
発光電気素子(33a,33b)として例えば発光ダイオード(37)が使用され、各発光ダイオード(37)は、それぞれ異なる抵抗値の抵抗体を介して電力生成コイル(32)へ接続されることにより、電力生成コイル(32)の同一の誘起電力に対して電力生成コイル(32)から供給される電流値に違いが生じる。例えば、電力生成コイル(32)の第１の誘起電力範囲では、赤の発光ダイオード(37)のみに発光に必要な電流が供給されるようにし、第１の誘起電力範囲より上の第２の誘起電力範囲では、赤の発光ダイオード(37)と共に、黄の発光ダイオード(37)にも発光に必要な電流が供給されるようにする。こうして、第１の誘起電力範囲では、赤の発光ダイオード(37)のみが発光して、ユーザは、レンズ(37)が赤く発光しているように認識し、また、第２の誘起電力範囲では、赤及び黄の発光ダイオード(37)が共に発光状態になり、ユーザは、レンズ(37)が赤と黄との合成色である橙色に発光しているように認識する。レンズ(37)の発光色が振動板部材(11)の駆動電流に関係して変化するので、ユーザへのアピール度が高まる。
【００２３】
この発明のスピーカ(10)によれば、ダストキャップ(12)が、円柱状ヨーク部(17)の頂面を覆うように、振動板部材(11)の前面側中央部に装着され、発光電気素子(33a,33b)は、円柱状ヨーク部(17)の頂部に取付けられてダストキャップ(12)の後ろ側に配置され、ダストキャップ(12)は、少なくとも部分的に光透過性材料部から成る。
【００２４】
光透過性材料とは、少なくとも半透明以上の材料を含むものとする。光透過性材料に、文字や絵等を書込んでおき、ダストキャップ(12)の後方における発光電気素子(33a,33b)の発光により光透過性材料の文字や絵が表出し、また、振動板部材(11)の振動効果によりその文字等が適度に震え、印象性が高まる。
【００２５】
この発明のスピーカ(10)によれば、ダストキャップ(12)が、円柱状ヨーク部(17)の頂面を覆うように、振動板部材(11)の前面側中央部に装着され、発光電気素子(33a,33b)は、円柱状ヨーク部(17)の頂部に取付けられてダストキャップ(12)の後ろ側に配置され、ダストキャップ(12)は、少なくとも部分的にハーフミラー部から成る。
【００２６】
ハーフミラー部にも、前述の光透過性材料と同様に、文字や絵等を書込んで、同様な効果を得ることができる。
【００２７】
この発明のスピーカ(10)の製造方法によれば、スピーカ(10)において、一体化品(29)が、外周側に電力生成コイル(32)を嵌装されたボビン(31)と、ボビン(31)のダストキャップ(12)側の端部に載置、固定される基板(29)とを含み、かつ一体化品(29)の基板(29)のダストキャップ(12)側の面に発光電気素子(33a,33b)を取付けられた状態まで、予め製作される。そして、その後、その一体化品(29)を、ボビン(31)が円柱状ヨーク部(17)の径縮小部(20)に嵌合するように、円柱状ヨーク部(17)に組付ける。
【００２８】
発光電気素子(33a,33b)及び電力生成コイル(32)が一体に組み付けられたボビン(31)を予め製作しておき、それを円柱状ヨーク部(17)に組付けるので、製造が能率化される。
【００２９】
【発明の実施の形態】
以下、発明の実施の形態について図面を参照して説明する。
図１はスピーカ10を概略的な縦断面構造図である。振動板部材11は、凹側を前方へ向けかつ円形の中心孔をもつ円錐型振動板部13と、円錐型振動板部13の中心孔を覆うように円錐型振動板部13の前面側から円錐型振動板部13に装着されるダストキャップ12と、円錐型振動板部13の中心孔の縁部に外周を固着されて後方へ突出するボイスコイルボビン24とを有している。ダンパー14は、放射方向外側の端をスピーカボックス内の静止部に固定され、放射方向内側の端をボイスコイルボビン24に固定され、振動板部材11をスピーカ10の中心線方向の中立位置に保持している。ボイスコイル25は、ボイスコイルボビン24の後端部の外周に嵌装、固定されている。ヨーク15は、ボイスコイルボビン24より後方において放射方向へ張り出すバックプレート16と、ボイスコイルボビン24の内周面との間にわずかの間隙を残しつつボイスコイルボビン24の内周側へボイスコイルボビン24と同軸的に挿入されている円柱のボス部17とを有している。環状永久磁石18は、ボス部17に同軸的にボス部17の外側に配置され、両端面においてバックプレート16及びトッププレート19に固着されている。トッププレート19は、バックプレート16の径と等しい径をもち、内周側においてボイスコイル25との接触を回避されつつ、ボス部17と同軸的に配置される。
【００３０】
付属品ユニット29は、基板30、及び一方の開口端部おいて基板30の後面に接着により固定されるボビン31を含む。電力生成コイル32は、ボビン31の外周側に嵌装、固定されている。発光ダイオード33a，33bは、基板30の上に左右対称位置関係で取付けられる。基板30には、また、電流調整用抵抗34も取付けられる。基板30への発光ダイオード33a，33b及び電流調整用抵抗34の固定は半田付けが利用される。付属品ユニット29は、発光ダイオード33a，33b及び電流調整用抵抗34を基板30に取付けられ、かつ電力生成コイル32を外挿、固定されたボビン31を基板30に一体化した状態で、スピーカ10における組付け工程とは別途、予め製作され、スピーカ10の組付け工程では、このような電力生成コイル32、発光ダイオード33a，33b、及び電流調整用抵抗34と共に一体化状態の付属品ユニット29が径縮小部20に組み付けられる。径縮小部20の周部とボビン31の内周部とは、等輪郭、等寸法であり、両者の一方又は両方に接着剤を塗布されてから、ボビン31の内周は径縮小部20の周部に案内されつつ、嵌合され、接着剤により固定状態になる。
【００３１】
スピーカ10の主要部の概略の寸法としては、円錐型振動板部13は、３０ｃｍの低音用であり、ボイスコイル25の内径はφ６５ｍｍ、電力生成コイル32の内径はφ５０ｍｍ、ボイスコイル25と電力生成コイル32との巻数比はほぼ１：１となっている。径縮小部20の頂面の高さは電力生成コイル32から電力が最大限有効に取り出せるように、電力生成コイル32の設置高さとほぼ同じ高さになるように設定されている。さらに、ボビン31の両端は電力生成コイル32の上側および下側より１ｍｍ程、軸方向外側となっており、径縮小部20の頂面が基板30における発光ダイオード33a，33bや電流調整用抵抗34等の部品の半田面や、電力生成コイル32の下部がヨーク15と短絡するのを防いでいる。
【００３２】
図２はダストキャップ12の前面側から見たダストキャップ12におけるレンズ37a，37bの配置を示している。図１及び図２において、レンズ37a，37bは、それぞれ発光ダイオード33a，33bを通りかつスピーカ10の中心線に対して平行な直線がダストキャップ12と交わる位置に穿設されたダストキャップ12の通孔に嵌着される。レンズ37a，37bの位置は、発光ダイオード33a，33bからのスピーカ10の前方へ進んで来た光がダストキャップ12に入射する部位に相当する。
【００３３】
図３はスピーカ10の電気回路図である。ボイスコイル25は、スピーカ10の外のスピーカ駆動アンプ35より駆動電流を供給される。ボイスコイル25及び電力生成コイル32は、変圧器41を構成する位置関係になっており、スピーカ駆動アンプ35からボイスコイル25への駆動電流の供給に伴い、電力生成コイル32に誘起電力が生成される。発光ダイオード33a，33bは、相互に逆向きで並列接続され、この並列接続部、電力生成コイル32、及び電流調整用抵抗34は１個の閉ループ回路を構成する。
【００３４】
スピーカ駆動アンプ35からのボイスコイル25への駆動電流の供給に伴い、ボイスコイル25は、スピーカ10の中心線方向の磁力を受け、ダンパー14に効してスピーカ10の中心線方向へ変位する。スピーカ駆動アンプ35からボイスコイル25への駆動電流は変動するので、振動板部材11は、スピーカ10の中心線方向へ振動し、音を生成する。また、スピーカ駆動アンプ35からボイスコイル25への駆動電流の変動により、ボイスコイル25及び電力生成コイル32は変圧器41の一次及び二次コイルとして作用し、電力生成コイル32には誘起電力が生成される。この誘起電力により発光ダイオード33a，33bは、電流調整用抵抗34を介して電力生成コイル32から電流を供給され、順方向の電流が供給されたとき、点灯状態になる。発光ダイオード33a，33bは、どちらか一方が順方向電流を供給されるので、常時、どちらか一方は点灯状態にある。発光ダイオード33a，33bの光はそれぞれレンズ37a，37bに達し、スピーカ10の前方に存在するユーザからは、あたかも各レンズ37a，37bが自ら発光しているように見える。なお、発光ダイオード33a，33bに指向性の鋭いものを使用すれば、発光ダイオード33a，33bの光りを、ほぼ損失無くレンズ37a，37bへ集めることができる。さらに、レンズ37a，37bはダストキャップ12と一体に振動し、その結果ダストキャップ12に設けられたレンズ37a，37bを通って来る光は、残像現象により、点ではなく、線で見えるようになり、ユーザへの見た目のアピール度が増大する。電力生成コイル32は、電磁誘導により電流を生成するので、スピーカ駆動アンプ35から電力生成コイル32への給電電流の一部を電力生成コイル32へ分配する必要はなく、ボイスコイル25の給電回路への付属品ユニット29からの接続配線は不要となる。したがって、付属品ユニット29は、他の部品とは独立して組み立てて、ヨーク15の径縮小部20に嵌合するだけでよい。
【００３５】
レンズ37a，37bに代わる別の構造として、ダストキャップ12の中央部の十分に大きな窓を形成し、その窓に、それに対応する寸法の大型レンズを装着する。また、異なる発光色の発光ダイオード用いて、各発光ダイオードの発光する電力生成コイル32の起電力レベルを電流調整用の抵抗の値により変えて光らせる。すなわち、発光色の異なる各発光ダイオードを、それぞれ抵抗値の異なる電流調整用抵抗を介して電力生成コイル32へ接続し、第１の起電力レベル範囲では、例えば発光色が赤色の発光ダイオードのみが発光レベル以上の電流を供給され、赤色の発光ダイオードのみが発光するようにし、第１の起電力レベル範囲より上の第２の起電力レベル範囲では、発光色が赤色の発光ダイオードのみならず、発光色が黄色の発光ダイオードにも発光レベル以上の電流が供給され、赤色及び黄色の発光ダイオードが発光するようにする。これにより、第１の起電力レベル範囲では、大型レンズは赤色で光り、第２の起電力レベル範囲では、赤色及び黄色の光の合成色である橙色で大型レンズが光るようにすることができる。
【００３６】
他に、ダストキャップ12を部分的に透明や半透明にして、その透明又は半透明部に文字や絵を表記したり、ダストキャップ12をハーフミラーにして、発光ダイオード33a，33bが発光していないときは、鏡のように見え、発光すると、ダストキャップ12の裏面側の光が見えるような構造を採用することもできる。
【図面の簡単な説明】
【図１】スピーカを概略的な縦断面構造図である。
【図２】ダストキャップの前面側から見たダストキャップにおけるレンズ，の配置を示す図である。
【図３】スピーカの電気回路図である。
【符号の説明】
１０スピーカ
１１振動板部材
１２ダストキャップ
１３円錐型振動板部
１５ヨーク（磁界生成装置）
１７ボス部（円柱状ヨーク部）
１８環状永久磁石（磁界生成装置）
１９トップフレート（磁界生成装置）
２０径縮小部
２４ボイスコイルボビン（筒部）
２５ボイスコイル
２９付属品ユニット（一体化品）
２９付属品ユニット
３１ボビン
３２電力生成コイル
３３ａ，３３ｂ発光ダイオード（発光電気素子）
３７ａ，３７ｂレンズ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a loudspeaker, and more particularly, to a loudspeaker provided with a light-emitting electric element for notifying a speaker during operation by emitting light and a method of manufacturing the loudspeaker.
[0002]
[Prior art]
Conventionally, in order to monitor an input to a speaker, a part of an input current to a voice coil of the speaker is caused to flow through a light emitting electric element such as a light emitting diode to emit light. In addition, the light emitting electric element is arranged outside the speaker.
[0003]
[Problems to be solved by the invention]
The problems in mounting the light emitting electric element in the conventional speaker are as follows. (A) The degree of appeal to the user (= recognition degree) is low.
(B) Since the electric power of the light emitting electric element utilizes a part of the driving current of the voice coil, wiring for connecting the light emitting electric element to the power supply circuit of the voice coil is required.
[0004]
The applicant of the present application has disclosed in Japanese Patent Application No. 10-338990 that the light-emitting electric element is mounted on the front surface of the diaphragm member, and the light-emitting electric element vibrates integrally with the diaphragm member. Disclosure to deal with. However, the loudspeaker of Japanese Patent Application No. 10-338990 cannot address the problem (b) at all. Further, in order to cope with the problem (a), there is no disclosure of disposing the diaphragm member other than the light emitting electric element.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a speaker and a manufacturing method which simultaneously overcome the above problems (a) and (b).
[0006]
[Means for Solving the Problems]
The speaker (10) of the present invention has the following.
Diaphragm member (11) having a cylindrical portion (24) projecting rearward at the center on the rear side
A voice coil (25) that is fitted to the cylindrical portion (24) of the diaphragm member (11), is displaced in the axial direction of the diaphragm member (11) integrally with the diaphragm member (11), and is supplied with a drive current.
A magnetic field generator (15, 18, 19) for generating a predetermined magnetic field in a spatial range including a voice coil (25)
Power generating coil (32) that generates induced electromotive force due to supply of variable driving current to voice coil (25)
Light emitting electric elements (33a, 33b) arranged so that light emission can be seen in the area of the voice coil (25) from the front side of the voice coil (25) and emitting light by power from the power generation coil (32)
[0007]
The voice coil (25) is normally fitted on the outer peripheral side of the cylindrical portion (24), but may be fitted on the inner peripheral side of the cylindrical portion (24). In order to make the light emission of the light emitting electric elements (33a, 33b) visible in the area of the voice coil (25) from the front side of the diaphragm member (11), the light emitting electric elements (33a, 33b) must be When mounting on the front surface of (11), and by disposing the light emitting electric elements (33a, 33b) behind the diaphragm member (11), providing holes in a part of the diaphragm member (11), The case where the light emission of the light emitting electric elements (33a, 33b) is made visible from the front side of the diaphragm member (11) through making the part or the whole of (11) transparent, through these holes or transparent parts. Including. The number of the light emitting electric elements (33a, 33b) is one or more.
[0008]
As a result of the drive current to the voice coil (25) fluctuating with time, the magnetic flux density in the magnetic field generators (15, 18, 19) changes, and the induced electromotive force is applied to the magnetic field generators (15, 18, 19). Generated. As a result, the light emitting electric elements (33a, 33b) are supplied with current from the power generation coil (32) and emit light. In addition, since the light emission of the light-emitting electric elements (33a, 33b) is seen by the user in the area of the voice coil (25), the light emission of the light-emitting electric elements (33a, 33b) seen by the user includes the voice coil (25) The effect of the vibration of the user appears, and the degree of appeal to the user increases. Then, in order to secure the power of the light emitting electric elements (33a, 33b), the induced electromotive force of the power generation coil (32) by the voice coil (25) is used, so that the driving current circuit of the voice coil (25) is used. The connection wiring for the light emitting electric elements (33a, 33b) can be omitted.
[0009]
According to the zero speaker (10) of the present invention, the power generating coil (32) is disposed on the inner peripheral side of the cylindrical portion (24), and the disc-shaped magnetic body (20) is disposed on the inner peripheral side of the power generating coil (32). Exists in
[0010]
Due to the arrangement of the disc-shaped magnetic body (20) on the inner peripheral side of the power generation coil (32), the change in magnetic flux density in the power generation coil (32) increases, and the induced power of the power generation coil (32) increases.
[0011]
According to the speaker (10) of the present invention, the magnetic field generating device (15, 18, 19) includes the cylindrical yoke (17) on the inner peripheral side of the cylindrical portion (24), and the cylindrical yoke (17) Is a disc-shaped magnetic body (20).
[0012]
Since the disk-shaped magnetic body (20) is formed as a part of the columnar yoke (17), the manufacture of the disk-shaped magnetic body (20) is facilitated and the structure is simplified.
[0013]
According to the loudspeaker (10) of the present invention, the top of the cylindrical yoke (17) that becomes the disk-shaped magnetic body (20) is a reduced diameter part (20) of the cylindrical yoke (17), and the power generation coil is formed. (32) is fitted on the outer periphery of the bobbin (31), and the bobbin (31) is fitted on the inner peripheral side of the diameter reducing portion (20).
[0014]
The bobbin (31) is fitted to the reduced diameter portion (20) at the top of the cylindrical yoke portion (17) until the bobbin (31) contacts, for example, the annular step portion of the cylindrical yoke portion (17). The work of assembling the power generating coil (32) and the bobbin (31) in the above is simplified.
[0015]
According to the speaker (10) of the present invention, both ends in the axial direction of the bobbin (31) project in the axial direction from both ends of the winding portion of the power generation coil (32) in the light emitting electric elements (33a, 33b). .
[0016]
Since the bobbin (31) protrudes from both ends in the axial direction from both ends of the winding portion of the power generation coil (32), the winding portion of the power generation coil (32) comes into contact with members on both sides in the axial direction of the bobbin (31). Thus, a short circuit between the wound portion of the power generating coil (32) and a conductor such as the cylindrical yoke portion (17) at both ends thereof is prevented.
[0017]
According to the speaker (10) of the present invention, the dust cap (12) is attached to the front center of the diaphragm member (11) so as to cover the top surface of the cylindrical yoke (17), The elements (33a, 33b) are attached to the top of the cylindrical yoke portion (17) and are arranged behind the dust cap (12), and the dust cap (33a, 33b) receives light from the light-emitting electrical elements (33a, 33b). A through-hole is provided at the part 12).
[0018]
Although the light-emitting electric elements (33a, 33b) are arranged on the rear side of the diaphragm member (11), the front side of the diaphragm member (11) passes through the through hole of the dust cap (12). The light emission becomes visible from. Further, since the light emitting electric elements (33a, 33b) are not attached to the diaphragm member (11), but are attached to the non-vibrating cylindrical yoke (17), the fixing of the light emitting electric elements (33a, 33b) is stable. Be transformed into When there are a plurality of light emitting electric elements (33a, 33b), through holes are provided at respective portions of the dust cap (12) where light from each light emitting electric element (33a, 33b) is incident.
[0019]
According to the speaker (10) of the present invention, the lens (37) is attached to the through hole.
[0020]
When there are a plurality of through holes, a lens (37) is attached to each through hole. By mounting the lens (37) in the through hole of the dust cap (12), the lens (37) itself emits light even though the light emitting electric elements (33a, 33b) are behind the dust cap (12). As a result, the user is recognized and the degree of appeal is increased. Further, since the dust cap (12) to which the lens (37) is attached vibrates as a part of the diaphragm member (11), the light of the lens (37) is not a point due to the afterimage phenomenon, It becomes visible as a line, and the appeal to the user increases from this point. The light-emitting electric elements (33a, 33b) are, for example, light-emitting diodes (37), and a light-emitting diode (37) having high directivity is used, and light from the light-emitting diodes (37) is transmitted to the lens (37). Directing is very advantageous because it increases the brightness of the light at the lens (37).
[0021]
According to the speaker (10) of the present invention, a plurality of light-emitting electric elements having different emission colors are present, and the light-emitting electric elements having different emission colors are connected to each other via a resistor having a different resistance value. The through hole is connected to the power generating coil (32), and the through hole is sized to receive light from a plurality of light emitting electric elements in common, and is fitted with a lens.
[0022]
For example, a light emitting diode (37) is used as the light emitting electric element (33a, 33b), and each light emitting diode (37) is connected to the power generation coil (32) via a resistor having a different resistance value. A difference occurs in the current value supplied from the power generation coil (32) for the same induced power of the power generation coil (32). For example, in the first induced power range of the power generating coil (32), only the red light emitting diode (37) is supplied with a current necessary for light emission, and the second induced power range is higher than the first induced power range. In the induced power range, a current required for light emission is supplied to the yellow light emitting diode (37) as well as the red light emitting diode (37). Thus, in the first induced power range, only the red light emitting diode (37) emits light, the user perceives that the lens (37) is emitting red light, and in the second induced power range, , The red and yellow light emitting diodes (37) are both in a light emitting state, and the user recognizes that the lens (37) emits light in orange, which is a composite color of red and yellow. Since the emission color of the lens (37) changes in relation to the drive current of the diaphragm member (11), the degree of appeal to the user increases.
[0023]
According to the speaker (10) of the present invention, the dust cap (12) is attached to the front center of the diaphragm member (11) so as to cover the top surface of the cylindrical yoke (17), The elements (33a, 33b) are attached to the top of the cylindrical yoke (17) and disposed behind the dust cap (12), and the dust cap (12) is at least partially separated from the light-transmitting material. Become.
[0024]
The light transmitting material includes at least a material that is translucent or more. Characters and pictures are written on the light-transmitting material, and the light-emitting electric elements (33a, 33b) behind the dust cap (12) emit light to expose the characters and pictures of the light-transmitting material, Due to the vibration effect of the plate member (11), the characters and the like are appropriately shaken, and the impression is enhanced.
[0025]
According to the speaker (10) of the present invention, the dust cap (12) is attached to the front center of the diaphragm member (11) so as to cover the top surface of the cylindrical yoke (17), The elements (33a, 33b) are mounted on the top of the cylindrical yoke (17) and arranged behind the dust cap (12), and the dust cap (12) at least partially comprises a half mirror part.
[0026]
Similar effects can be obtained by writing characters, pictures, and the like on the half mirror portion, similarly to the above-described light-transmitting material.
[0027]
According to the method for manufacturing the speaker (10) of the present invention, in the speaker (10), the integrated product (29) includes a bobbin (31) fitted with a power generation coil (32) on the outer peripheral side, and a bobbin (31). A substrate (29) mounted and fixed on the end of the dust cap (12) side of (31), and a light is emitted on the surface of the substrate (29) of the integrated product (29) on the dust cap (12) side. It is manufactured in advance to a state where the electric elements (33a, 33b) are attached. Then, the integrated product (29) is assembled to the cylindrical yoke (17) such that the bobbin (31) fits into the reduced diameter portion (20) of the cylindrical yoke (17).
[0028]
A bobbin (31) in which the light-emitting electric elements (33a, 33b) and the power generation coil (32) are integrally assembled is manufactured in advance, and the bobbin (31) is assembled to the cylindrical yoke (17), so that production is streamlined. Is done.
[0029]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic longitudinal sectional structural view of the speaker 10. The diaphragm member 11 has a conical diaphragm portion 13 with a concave side facing forward and a circular center hole, and a front side of the conical diaphragm portion 13 covering the center hole of the conical diaphragm portion 13. It has a dust cap 12 attached to the conical diaphragm 13 and a voice coil bobbin 24 whose outer periphery is fixed to the edge of the center hole of the conical diaphragm 13 and projects rearward. The damper 14 has a radially outer end fixed to a stationary portion in the speaker box, a radially inner end fixed to the voice coil bobbin 24, and holds the diaphragm member 11 at a neutral position in the center line direction of the speaker 10. ing. The voice coil 25 is fitted and fixed on the outer periphery of the rear end of the voice coil bobbin 24. The yoke 15 is coaxial with the voice coil bobbin 24 on the inner peripheral side of the voice coil bobbin 24 while leaving a slight gap between the back plate 16 projecting radially behind the voice coil bobbin 24 and the inner peripheral surface of the voice coil bobbin 24. And a columnar boss portion 17 that is inserted into the column. The annular permanent magnet 18 is arranged coaxially with the boss 17 outside the boss 17, and is fixed to the back plate 16 and the top plate 19 at both end surfaces. The top plate 19 has a diameter equal to the diameter of the back plate 16, and is arranged coaxially with the boss portion 17 while avoiding contact with the voice coil 25 on the inner peripheral side.
[0030]
The accessory unit 29 includes a substrate 30 and a bobbin 31 fixed to the rear surface of the substrate 30 at one open end by bonding. The power generation coil 32 is fitted and fixed on the outer peripheral side of the bobbin 31. The light emitting diodes 33a and 33b are mounted on the substrate 30 in a symmetrical positional relationship. The current adjusting resistor 34 is also attached to the substrate 30. The light emitting diodes 33a and 33b and the current adjusting resistor 34 are fixed to the substrate 30 by soldering. The accessory unit 29 includes a speaker 10 with the light emitting diodes 33a and 33b and the current adjusting resistor 34 attached to the substrate 30 and the power generation coil 32 extrapolated and the fixed bobbin 31 integrated with the substrate 30. In the assembling step of the speaker 10, the accessory unit 29 integrated with the power generation coil 32, the light emitting diodes 33a and 33b, and the current adjusting resistor 34 is separately provided in addition to the assembling step. It is assembled to the diameter reduction section 20. The peripheral portion of the diameter reducing portion 20 and the inner peripheral portion of the bobbin 31 have the same contour and the same size, and after the adhesive is applied to one or both of them, the inner periphery of the bobbin 31 While being guided by the peripheral portion, they are fitted and fixed by an adhesive.
[0031]
As for the approximate dimensions of the main part of the speaker 10, the conical diaphragm portion 13 is for 30 cm low sound, the inner diameter of the voice coil 25 is φ65 mm, the inner diameter of the power generating coil 32 is φ50 mm, and the The turn ratio with the coil 32 is approximately 1: 1. The height of the top surface of the diameter reducing section 20 is set to be substantially the same as the installation height of the power generation coil 32 so that power can be extracted from the power generation coil 32 as effectively as possible. Further, both ends of the bobbin 31 are axially outside by about 1 mm from the upper side and the lower side of the power generating coil 32, and the top surface of the diameter reducing portion 20 is the light emitting diodes 33a and 33b and the current adjusting resistor 34 on the substrate 30. This prevents the solder surface of the component and the like and the lower part of the power generating coil 32 from being short-circuited to the yoke 15.
[0032]
FIG. 2 shows the arrangement of the lenses 37a and 37b in the dust cap 12 as viewed from the front side of the dust cap 12. 1 and 2, the lenses 37a and 37b pass through the dust cap 12 formed at a position where a straight line passing through the light emitting diodes 33a and 33b and parallel to the center line of the speaker 10 intersects the dust cap 12. Fitted in the hole. The positions of the lenses 37a and 37b correspond to portions where the light from the light emitting diodes 33a and 33b that has traveled forward of the speaker 10 enters the dust cap 12.
[0033]
FIG. 3 is an electric circuit diagram of the speaker 10. The voice coil 25 is supplied with a drive current from a speaker drive amplifier 35 outside the speaker 10. The voice coil 25 and the power generation coil 32 are in a positional relationship forming a transformer 41, and an induced power is generated in the power generation coil 32 as a driving current is supplied from the speaker driving amplifier 35 to the voice coil 25. You. The light emitting diodes 33a and 33b are connected in parallel in opposite directions, and the parallel connection, the power generation coil 32, and the current adjusting resistor 34 constitute one closed loop circuit.
[0034]
With the supply of the drive current from the speaker drive amplifier 35 to the voice coil 25, the voice coil 25 receives the magnetic force in the direction of the center line of the speaker 10 and acts on the damper 14 to be displaced in the direction of the center line of the speaker 10. Since the drive current from the speaker drive amplifier 35 to the voice coil 25 fluctuates, the diaphragm member 11 vibrates in the direction of the center line of the speaker 10 to generate sound. In addition, due to fluctuations in the drive current from the speaker drive amplifier 35 to the voice coil 25, the voice coil 25 and the power generation coil 32 act as primary and secondary coils of the transformer 41, and the power generation coil 32 generates induced power. Is done. The light-emitting diodes 33a and 33b are supplied with current from the power generation coil 32 via the current adjusting resistor 34 by the induced power, and are turned on when a forward current is supplied. Either of the light emitting diodes 33a and 33b is supplied with the forward current, so that one of the light emitting diodes 33a and 33b is always lit. The light of the light emitting diodes 33a and 33b reaches the lenses 37a and 37b, respectively, and from the user existing in front of the speaker 10, it appears as if each of the lenses 37a and 37b is emitting light. If light emitting diodes 33a and 33b having sharp directivity are used, light from the light emitting diodes 33a and 33b can be collected to the lenses 37a and 37b with almost no loss. Further, the lenses 37a and 37b vibrate integrally with the dust cap 12, so that the light passing through the lenses 37a and 37b provided on the dust cap 12 becomes visible as lines, not dots, due to the afterimage phenomenon. Thus, the degree of visual appeal to the user increases. Since the power generation coil 32 generates a current by electromagnetic induction, it is not necessary to distribute a part of the power supply current from the speaker drive amplifier 35 to the power generation coil 32 to the power generation coil 32, and to the power supply circuit of the voice coil 25. The connection wiring from the accessory unit 29 is unnecessary. Therefore, the accessory unit 29 need only be assembled independently of other components and fitted to the reduced diameter portion 20 of the yoke 15.
[0035]
As another structure replacing the lenses 37a and 37b, a sufficiently large window in the center of the dust cap 12 is formed, and a large lens having a size corresponding to the window is attached to the window. In addition, light emitting diodes of different colors are used to emit light by changing the electromotive force level of the power generation coil 32 that emits light from each light emitting diode according to the value of a current adjusting resistor. That is, each light emitting diode having a different emission color is connected to the power generating coil 32 via a current adjusting resistor having a different resistance value. In the first electromotive force level range, for example, only the light emitting diode having a red emission color is used. A current equal to or higher than the light emission level is supplied so that only the red light emitting diode emits light. In the second electromotive force level range above the first electromotive force level range, not only the light emitting diode emitting red light, A current higher than the light emission level is also supplied to the light emitting diode emitting yellow light, so that the red and yellow light emitting diodes emit light. Thus, in the first electromotive force level range, the large lens shines in red, and in the second electromotive force level range, the large lens shines in orange, which is a composite color of red and yellow light. .
[0036]
In addition, the light emitting diodes 33a and 33b emit light when the dust cap 12 is partially transparent or translucent and characters or pictures are written on the transparent or translucent portion, or when the dust cap 12 is a half mirror. When not present, a structure that looks like a mirror and emits light so that light on the back side of the dust cap 12 can be seen may be employed.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional structural view of a speaker.
FIG. 2 is a diagram showing an arrangement of lenses in the dust cap as viewed from the front side of the dust cap.
FIG. 3 is an electric circuit diagram of a speaker.
[Explanation of symbols]
Reference Signs List 10 speaker 11 diaphragm member 12 dust cap 13 conical diaphragm portion 15 yoke (magnetic field generating device)
17 Boss (columnar yoke)
18 annular permanent magnet (magnetic field generator)
19 Top frates (magnetic field generator)
20 Diameter reduction part 24 Voice coil bobbin (tube part)
25 Voice coil 29 Accessory unit (Integrated product)
29 Accessory unit 31 Bobbin 32 Power generation coil 33a, 33b Light emitting diode (light emitting electric element)
37a, 37b lens

Claims

A diaphragm member (11) having a cylindrical portion (24) projecting rearward at a central portion on the rear side,
A voice fitted to the cylindrical portion (24) of the diaphragm member (11) and displaced in the axial direction of the diaphragm member (11) integrally with the diaphragm member (11) and supplied with a drive current. Coil (25),
A magnetic field generator (15, 18, 19) for generating a predetermined magnetic field in a spatial range including the voice coil (25),
A power generating coil (32) for generating an induced electromotive force due to the supply of the variable driving current to the voice coil (25), and a region from the front side of the voice coil (25) to the voice coil (25). It has a light emitting electric element (33a, 33b) arranged so that light emission can be seen and emitting light by electric power from the power generation coil (32),
The power generation coil (32) is disposed on the inner peripheral side of the cylindrical portion (24) , and the disc-shaped magnetic body (20) is present on the inner peripheral side of the power generation coil (32). .

The magnetic field generating device (15, 18, 19) includes a cylindrical yoke portion (17) on the inner peripheral side of the cylindrical portion (24), and the top of the cylindrical yoke portion (17) has the disk-shaped magnetic material. The speaker according to claim 1, wherein (20).

The top of the columnar yoke portion (17), which becomes the disk-shaped magnetic body (20), is a diameter reduction portion (20) of the columnar yoke portion (17), and the power generating coil (32) is formed of a bobbin (31). The speaker according to claim 2 , wherein the bobbin (31) is fitted on an outer periphery, and is fitted on a peripheral portion of the diameter reducing portion (20) on an inner peripheral side.

Both axial ends of the bobbin (31), according to claim 3, characterized in that protrudes in the axial direction from both ends of the winding portion of the light-emitting electrical elements (33a, 33b) said power generation coil in (32) The described speaker.

A dust cap (12) is attached to the front center of the diaphragm member (11) so as to cover the top surface of the cylindrical yoke portion (17), and the light-emitting electric elements (33a, 33b) A portion of the dust cap (12) which is attached to the top of the cylindrical yoke (17) and is disposed behind the dust cap (12), and into which light from the light emitting electric elements (33a, 33b) is incident. The speaker according to any one of claims 1 to 4, wherein a through hole is provided in the speaker.

The speaker according to claim 5, wherein a lens (37) is attached to the through hole.

As the light-emitting electric elements , there are a plurality of light-emitting electric elements having different emission colors, and the light-emitting electric elements having different emission colors are connected to the power generation coil (32) via resistors having mutually different resistance values. 7. The loudspeaker according to claim 6 , wherein the through-hole is dimensioned to receive light from a plurality of light emitting electric elements in common, and is provided with a lens.

A dust cap (12) is attached to the front center of the diaphragm member (11) so as to cover the top surface of the cylindrical yoke portion (17), and the light-emitting electric elements (33a, 33b) The dust cap (12) is attached to the top of the cylindrical yoke (17) and is disposed behind the dust cap (12), and the dust cap (12) is at least partially made of a light-transmitting material. The speaker according to any one of claims 1 to 4 , wherein:

A dust cap (12) is attached to the front center of the diaphragm member (11) so as to cover the top surface of the cylindrical yoke portion (17), and the light-emitting electric elements (33a, 33b) wherein the disposed behind the mounted by the dust cap on the top (12) of the cylindrical yoke portion (17), said dust cap (12) is characterized in that it consists at least partially half mirror unit Item 5. The speaker according to any one of Items 1 to 4 .

The speaker (10) according to any one of claims 5 to 9 , wherein an integrated product (29) includes the bobbin (31) fitted with the power generation coil (32) on an outer peripheral side, and the bobbin (31). 31) a substrate (29) mounted and fixed on the end on the dust cap (12) side, and the integrated product (29) on the substrate (29) side of the dust cap (12). The light emitting electric elements (33a, 33b) are attached to the surface in advance until they are mounted.Then, the integrated product (29) and the bobbin (31) are attached to the cylindrical yoke portion (17). A method for manufacturing a speaker, comprising: assembling the cylindrical yoke portion (17) so as to fit the reduced diameter portion (20).