JP3892388B2

JP3892388B2 - Portable electronic device equipped with diaphragm type speaker

Info

Publication number: JP3892388B2
Application number: JP2002324132A
Authority: JP
Inventors: 隆史伊東; 光一野口; 賢司上野; 優一橋本
Original assignee: Namiki Precision Jewel Co Ltd; Seiko Instruments Inc; Adamant Namiki Precision Jewel Co Ltd
Current assignee: Namiki Precision Jewel Co Ltd; Seiko Instruments Inc; Adamant Namiki Precision Jewel Co Ltd
Priority date: 2002-11-07
Filing date: 2002-11-07
Publication date: 2007-03-14
Anticipated expiration: 2022-11-07
Also published as: AU2003277545A1; AU2003277545A8; WO2004043113A1; JP2004159181A

Description

【０００１】
【発明の属する技術分野】
本発明は、腕時計型携帯電話機などの携帯型電子機器に備えられているダイヤフラム型スピーカの防水構造に関する。
【０００２】
【従来の技術】
携帯電話などの小型の携帯型電子機器、特に腕に装着して携帯する腕時計型携帯電話機などの携帯型電子機器は、雨の中での使用や手洗いなどで水に接する機会が多いので、防水構造を採用することが要求されている。防水性能のない、或いは防水性能の低い携帯機器では容易に水が機器内に侵入し、これが故障の原因となるからである。
【０００３】
ところで、ダイヤフラム型スピーカを備える一般的な電子機器では、機器筐体に形成されたスピーカ収納室の開口は蓋部材で塞がれているが、完全密封型ではない。前記蓋部材には大径のスピーカ取付穴と小径の貫通孔が形成されている。前記スピーカは、前記スピーカ取付穴をスピーカ振動板で塞いで、前記蓋部材に固定されている。前記小径の貫通孔を通して、前記スピーカ収納室は常に外気の圧力に保たれている。しかし、このような不完全な密封構造では、防水性能が低く、容易に水が機器内に侵入し、これが故障の原因となる。
【０００４】
そこで、完全密封型の防水構造のダイヤフラム型スピーカが開発された。この従来の完全密封型の防水構造のスピーカは、前記小径の貫通孔を設けないで、外気の圧力と内部の圧力に応じて容積が変化する圧力調整室を前記スピーカ収納室内に設けたものである。前記圧力調整室は、例えばスピーカ振動板よりも薄くて柔軟なゴム製チューブである。このような完全密封型で圧力調整室を設ける構造は複雑で、携帯機器の一部分などの限られた空間内にこれを収めることが困難である。従って、大きな容積のスピーカ収納室を形成できない小型の携帯型電子機器には採用できないという問題がある（例えば、特許文献１参照。）。
【０００５】
また、樹脂製の変形膜を防水膜とする完全密封型の防水構造のスピーカもすでに開示されている。この完全密封型の防水構造のスピーカにおいて、スピーカ収納室の開口は前記変形膜で液密にして塞がれている。圧電スピーカは、前記変形膜の裏側、即ち内側防水領域の面に接着されている（例えば、特許文献２参照。）。
【０００６】
また、スピーカ収納室の開口を防水膜で塞ぐと共に、前記スピーカ収納室内に前記防水膜の変形を規制する通気性を有する保護部材を設けた完全密封型の防水構造のスピーカも開示されている。しかしながら、このような防水膜を用いた完全密封型の防水構造のスピーカは、防水膜の存在が音響性能の劣化を招くという問題がある（例えば、特許文献３参照。）。
【０００７】
【特許文献１】
特開平１１−３３１９６７号公報
【特許文献２】
特開２００１−３６９８２号公報
【特許文献３】
特開２００１−１２８２７２号公報
【０００８】
【発明が解決しようとする課題】
本発明が解決しようとする課題は、音響性能を劣化させないで日常生活環境で高い防水性能を維持するダイヤフラム型スピーカを備えた携帯型電子機器を提供することである。
【０００９】
【課題を解決するための手段】
上記課題を解決するために、防水性の波型ダイヤフラムのスピーカ振動板とボイスコイルと磁気回路構成部材とを備えたダイヤフラム型スピーカを機器筐体に形成されたスピーカ収納室に収納した携帯型電子機器において、前記スピーカ振動板を防水膜として機能するようにして蓋部材で蓋をした完全密閉型のスピーカ収納室を形成したこと、及び前記磁気回路構成部材を軸方向に移動可能にしてスピーカ筐体に保持することによって前記スピーカ振動板を圧力調整膜としても機能するようにした。
【００１０】
即ち、上記課題を解決するダイヤフラム型スピーカを備えた携帯型電子機器は、波型ダイヤフラムのスピーカ振動板を備えたダイヤフラム型スピーカを機器筐体に形成されたスピーカ収納室に収納し且つ前記スピーカ収納室を前記スピーカ振動板を防水膜として機能するようにして蓋部材で蓋をした完全密閉型とした携帯型電子機器である。
そして、前記ダイヤフラム型スピーカは、円筒状スピーカ筐体と、前記円筒状スピーカ筐体の上側開口に外周縁が固着されて概ね外側に膨らんだ波型の防水性の樹脂製ダイヤフラムのスピーカ振動板と、前記スピーカ振動板の裏面に取付けられた同心円筒状ボイスコイルと、前記ボイスコイルに対向して配置されて前記ボイスコイルの磁路を形成すると共に水圧がかかったときに前記スピーカ振動板が着座する着座面として機能する磁気回路構成部材と、前記磁気回路構成部材を軸方向に移動可能にして前記円筒状スピーカ筐体に保持するバネ部材とから構成されたものである。
【００１１】
上記ダイヤフラム型スピーカを備えた携帯型電子機器において、前記磁気回路構成部材の着座面は、高い水圧がかかった場合に前記樹脂製スピーカ振動板の裏面が着座する平坦面である。
【００１２】
上記ダイヤフラム型スピーカを備えた携帯型電子機器において、前記樹脂製スピーカ振動板は前記蓋部材に形成された円筒状開口部に可とう性を有する防水性接着剤で接着されている。
【００１３】
上記ダイヤフラム型スピーカを備えた携帯型電子機器において、前記磁気回路構成部材は前記円筒状スピーカ筐体に３個の板バネによって三点保持されている。
【００１４】
上記ダイヤフラム型スピーカを備えた携帯型電子機器において、前記機器筐体の一部をカバーする蓋部材は複数の放音口が形成され、且つ、前記円筒状スピーカ筐体の上側開口に対応した裏面が中央部の水平な平坦面と周縁部の傾斜面とから構成されている。
【００１５】
上記ダイヤフラム型スピーカを備えた携帯型電子機器において、前記ダイヤフラム型スピーカは、前記スピーカ収納室の底面に環状の緩衝部材を介して載置されている。
【００１６】
【発明の実施の形態】
図１は、本発明の防水型のダイヤフラム型スピーカ１０が適用された腕時計型携帯電話器の断面図である。図１において、腕時計型携帯電話器の機器筐体は、電子回路を含む機能部が収納された本体ケース部、ダイヤフラム型スピーカ１０が収納された１２時側バンド部、マイクロホン１１が収納された６時側バンド部、前記本体ケース部と前記１２時側バンド部を連結する１２時側ヒンジ７、及び、前記本体ケース部と前記６時側バンド部を連結する６時側ヒンジ８とで構成されたものである。
【００１７】
前記本体ケース部は胴部本体１とその裏蓋４とから構成され、前記１２時側バンド部は１２時側バンド本体２とその裏蓋５とから構成され、更に、前記６時側バンド部は６時側バンド本体３とその裏蓋６とから構成されている。前記胴部本体１には液晶パネル等の表示窓１２が設けられている。６時側バンド本体３には操作ボタン９が設けられている。
【００１８】
マイクロホン１１が収納されたマイクロホン収納室は、６時側バンド本体３に形成された所定の形状と大きさの開口部を有する収納室である。６時側バンドの裏蓋６には、マイクロホン１１の受音口Ｑが形成されている。
【００１９】
スピーカ収納室２０は、１２時側バンド本体２に形成された有底円筒室を裏蓋５で塞いで形成されている。ダイヤフラム型スピーカ１０が収納されるスピーカ収納室の唯一の開口は、前記有底円筒室の開口である。１２時側バンドの裏蓋５には、スピーカの放音口Ｐが形成されている。
【００２０】
図２〜図４に示す第１実施形態のスピーカの防水構造において、ダイヤフラム型スピーカ１０は動電型スピーカであって、上部環状段部２１ａと下部環状段部２１ｂと環状底部２１ｃが内周面に形成された円筒状スピーカ筐体２１と、円筒状スピーカ筐体２１の上部環状段部２１ａに外周端部が固着された防水性の樹脂製スピーカ振動板２２と、スピーカ振動板２２の裏面に固着された同心円筒状のボイスコイル２３と、音声信号電流が入力されるボイスコイル２３と磁気的に結合する磁気回路構成部材２４と、磁気回路構成部材２４を円筒状スピーカ筐体２１の下部環状段部２１ｂに保持する板バネ２５とで構成されている。
【００２１】
防水性の樹脂製スピーカ振動板２２は、同心円の複数の凹凸を有し且つ概ね外側に膨らんだ防水性の波型ダイヤフラムである。即ち、樹脂製スピーカ振動板２２において、ボイスコイル２３の取付位置と外周端との間の面は表側に湾曲し、且つボイスコイル２３の取付位置と中心部との間の面も表側に湾曲し、結果として中央部の面は内側に凹んでいる。従って、波型樹脂製スピーカ振動板２２は、中心を通る縦断面の端から端までの間に複数の凹凸が存在する。なお、この実施形態において、小型の携帯型電子機器に用いるダイヤフラム型スピーカのスピーカ振動板は、厚さ３８μmのポリイミド膜で形成した。
もちろん、この振動板の材質及び厚さはこれに限るものではなく、防水性及び可撓性を有するものであれば、適用可能である。
【００２２】
ブロックで示されている磁気回路構成部材２４は、図示しない永久磁石が組み込まれた円盤状磁性部材で、例えば磁性体のヨークに円盤状の永久磁石が固着されて構成されている。磁気回路構成部材２４には、同心円筒状のボイスコイル２３が近接して出入りする環状溝２４ａが形成されている。また、磁気回路構成部材２４の外周面の上部には環状突出部２４ｂが形成されている。磁気回路構成部材２４は、環状突出部２４ｂと円筒状スピーカ筐体２１の下部環状段部２１ｂとの間に配置された板バネ２５によって、軸方向に移動可能にして円筒状スピーカ筐体２１に保持されている。
【００２３】
本発明において、磁気回路構成部材２４は、音声信号電流が入力されたボイスコイル２３と磁気的に結合して樹脂製スピーカ振動板２２を振動させる電気音響変換部材の一つであるが、後述する如く、樹脂製スピーカ振動板２２が水圧を受けて内側に膨らんだときの保護部材として機能するものである。
【００２４】
ダイヤフラム型スピーカ１０は、１２時側バンド本体２に形成された有底円筒室のスピーカ収納室２０に収納されている。そして、ダイヤフラム型スピーカ１０は、円筒状スピーカ筐体２１の上下端部を１２時側バンドの裏蓋５とクッション２６が固着された１２時側バンド本体２とで挟持して機器筐体に固定されている。即ち、ダイヤフラム型スピーカ１０は、その円筒状スピーカ筐体２１の環状底部２１ｃをクッション２６上に当接するようにしてスピーカ収納室２０に収納され、且つ、その円筒状スピーカ筐体２１の上端部を１２時側バンドの裏蓋５で押えられている。裏蓋５には、ダイヤフラム型スピーカ１０のスピーカ振動板２２より少し小さい径の１個の放音口５ａが形成されている。
【００２５】
１２時側バンドの裏蓋５は１２時側バンド本体２に嵌合して固着されているが、１２時側バンドの裏蓋５は円筒状スピーカ筐体２１とも嵌合している。即ち、１２時側バンドの裏蓋５には、スピーカ収納室２０の嵌合用の内側円環状突起５ｂと外側円環状突起５ｃが形成されている。これらの円環状突起５ｂと５ｃの間に円筒状スピーカ筐体２１の上端部が嵌合している。内側円環状突起５ｂと外側円環状突起５ｃと円筒状スピーカ筐体２１の上端部の嵌合面には、接着剤Ｒが充填されている。また、樹脂製スピーカ振動板２２の表面の外周部と１２時側バンドの裏蓋５の開口５ａの内周面が接する円環状部にも接着剤Ｒが塗布されている。
【００２６】
このようにして、ダイヤフラム型スピーカ１０は機器筐体である１２時側バンドに収納されて固定され、且つ、１２時側バンド本体２に形成されたスピーカ収納室２０の開口は液密に封止されている。なお図示されていないが、上記接着材Ｒで防水シールされた部分以外にも、１２時側バンド本体２と裏蓋５との係合部分には必要な防水シールが施されている。従って、スピーカ収納室２０は完全に密封されており、１２時側バンドに収納されて固定されたダイヤフラム型スピーカ１０は完全密封型の防水構造のスピーカである。
【００２７】
クッション２６は、スピーカ収納室２０の底面２０ｂに接着剤等で固着された円環状の緩衝部材で、シリコン系のゴム等で製造されている。クッション２６は、水圧がかかったときにスピーカ１０が１２時側バンドの裏蓋５から剥離しないように作用する緩衝部材である。即ち、水圧がかかったときにはスピーカ１０が押し下げられて円筒状スピーカ筐体２１が１２時側バンド裏蓋５の外側円環状突出部５ｃの内周面から剥離させるような下向きの力が加わるが、クッション２６はこれに抗して上向きの力を円筒状スピーカ筐体２１に加える。このようなクッション２６の作用によって、水圧がかかってもスピーカ１０は１２時側バンドの裏蓋５から剥離することはない。
【００２８】
クッション２６は、上述の如く、円環状に形成されている。これは、小型の携帯型電子機器の機器筐体に形成されたスピーカ収納室２０の狭い内部空間において、背面音響空間２７の容積を出来るだけ大きくし、所定の音響性能を確保するためである。
【００２９】
磁気回路構成部材２４を円筒状スピーカ筐体２１の下部環状段部２１ｂに保持する板バネ２５は、図３に平面図で示す如く、リング状の外側板バネ２５ａ、リング状の内側板バネ２５ｂ、リング状の接続用板バネ２５ｃとから構成された三点保持型板バネである。リング状の内側板バネ２５ｂはリング状の外側板バネ２５ａよりも高くなっており、従ってこれらを接続するリング状の接続用板バネ２５ｃは傾斜している。図２、図４、図５及び図６に示す板バネ２５の断面図は、図３のＡ−Ａ’で切断して示した断面図である。
【００３０】
なお、磁気回路構成部材２４を軸方向に移動可能にして円筒状スピーカ筐体２１に保持するバネ部材は、三点保持型板バネ２５に限定されるものではなく、２個以上で複数点保持できればよい。例えば普通のコイルバネを利用することもできる。この場合、前記コイルバネの内径部分に磁気回路構成部材２４を嵌め込んで、磁気回路構成部材２４を移動可能にして円筒状スピーカ筐体２１に保持する。
【００３１】
上述の如く構成した本発明の第１実施形態において、水圧がかかった状態では、波型スピーカ振動板２２は変形し磁気回路構成部材２４の上面に当接するようになる。さらに高い水圧がかかった状態では、波型スピーカ振動板２２にかかった水圧により、板バネ２５が圧縮される方向に磁気回路構成部材２４が移動する。磁気回路構成部材２４の移動量は円筒状スピーカ筐体２１に設けられた度当たり位置である環状底部２１ｃの上面までである。即ち、磁気回路構成部材２４は波型スピーカ振動板２２が着座した状態で、図２に示す位置から図４に示す位置まで移動する。換言すれば、完全密閉されたスピーカ収納室２０の内部容積は、水圧がかかっていない状態の図２に示す大きさから、高い水圧がかかって磁気回路構成部材２４の最大移動量が規制された状態の図４に示す大きさまで圧縮される。
【００３２】
この圧縮された容積によりスピーカ収納室２０の内部圧力は上昇し、波型スピーカ振動板２２にかかった水圧とバランスをとる。従って、波型スピーカ振動板２２は変形するのみであって、材料が伸びて塑性変形することはない。
【００３３】
これ以上の高水圧では、磁気回路構成部材２４の壁が存在しない部分、即ち波型スピーカ振動板２２が磁気回路構成部材２４に着座していない外周部分が水圧に耐える状態となるが、波型スピーカ振動板２２の変形によりスピーカ収納室２０の内部圧力も上昇するので、波型スピーカ振動板２２の表面と裏面にかかる圧力の差は低減されている。従って、適切な材料と形状を採用することにより、使用範囲においては、波型スピーカ振動板２２が磁気回路構成部材２４に着座していない外周部分が塑性変形することはない。このように、防水性の波型スピーカ振動板２２が防水膜と圧力調整膜とスピーカ振動板の三役を同時に機能する構成で、比較的高い水圧にも耐えられるようになった。
【００３４】
要するに、磁気回路構成部材２４はスピーカとして動作する際にはバネ２５により固定されているが、波型スピーカ振動板２２に水圧がかかった状態ではスピーカ振動板２２の変形を支え且つ波型スピーカ振動板２２の塑性変形を防止する保護部材として機能する。その結果、保護部材として機能する磁気回路構成部材２４に支えられて変形する波型スピーカ振動板２２は、防水膜として機能すると共に、圧力調整膜として機能するのである。
【００３５】
水圧が取り除かれると、磁気回路構成部材２４はバネ２５の弾性により元の位置に移動し、波型スピーカ振動板２２は元の形状に復元する。従って、スピーカの音響性能が損なわれることはない。
【００３６】
次に、図５と図６に示す第２実施形態の防水構造は、上述の第１実施形態の防水構造において、スピーカ振動板の高温環境化での塑性変形の防止手段を設けたものである。即ち、上述の第１実施形態の防水構造において、スピーカ収納室２０が形成された１２時側バンド本体２をカバーする裏蓋５は、スピーカ振動板２２よりも少し小さい径の１個の放音口Ｐが形成された蓋部材である。これに対して、第２実施形態の防水構造においては、スピーカ収納室２０が形成された１２時側バンド本体２をカバーする裏蓋５は、スピーカ振動板２２よりも非常に小さい径の複数個の放音口Ｐが形成された蓋部材である。しかも、裏蓋５において、複数個の放音口Ｐが形成された部分の裏面は、水平な平坦面の中央部５ｂと傾斜面の周縁部５ｃとから構成されている。
【００３７】
このような構成により、高温環境下でスピーカ収納室２０の内部の空気が体積膨張すると、波型スピーカ振動板２２は図５の状態から更に膨らみ、遂には図６の状態になる。複数個の放音口Ｐが形成された蓋部材５の裏面と波型スピーカ振動板２２の表面との間隔は、使用温度範囲において波型スピーカ振動板２２が最大限膨らむ状態を考慮して定められている。従って、高温環境下で膨らんだ波型スピーカ振動板２２は、複数個の放音口Ｐが形成された蓋部材５の裏面が壁となりそれ以上の膨らみは阻止される。このようにして、高温環境下でスピーカ収納室２０の内部の空気体積の膨張とそれに伴う圧力上昇があっても、波型スピーカ振動板２２は変形するのみで、塑性変形することはない。
【００３８】
高温環境下から常温に戻ったときは、波型スピーカ振動板２２は元の形状に直ちに復元するから、スピーカ性能が損なわれることがない。
【００３９】
【発明の効果】
本発明により、音響性能を劣化させないで日常生活環境で高い防水性能を維持するダイヤフラム型スピーカを備えた携帯型電子機器を提供することができた。しかも、本発明にかかるダイヤフラム型スピーカを備えた携帯型電子機器において、その防水構造のスピーカは波型スピーカ振動板を防水膜と圧力調整膜としても機能させるように構成したものであるから、構造が比較的簡単で且つ低コストの防水構造のスピーカである。従って、特に小型の携帯型電子機器に適した防水構造のスピーカを実現できた。
【図面の簡単な説明】
【図１】本発明が適用された腕時計型携帯電話機の一実施例の断面図である。
【図２】第１実施形態のダイヤフラム型スピーカを備えた腕時計型携帯電話機の主要部の断面図である。
【図３】ダイヤフラム型スピーカのスピーカ振動板を保持する板バネの一実施例の平面図である。
【図４】高い水圧がかかった場合の第１実施形態のダイヤフラム型スピーカを備えた腕時計型携帯電話機の主要部の断面図である。
【図５】第２実施形態のダイヤフラム型スピーカを備えた腕時計型携帯電話機の主要部の断面図である。
【図６】高い水圧がかかった場合の第２実施形態のダイヤフラム型スピーカを備えた腕時計型携帯電話機の主要部の断面図である。
【符号の説明】
１胴部本体
２１２時側バンド本体
３６時側バンド本体
４胴部の裏蓋
５１２時側バンドの裏蓋
５ａ開口
５ｂ嵌合用の内側円環状突起
５ｃ嵌合用の外側円環状突起
６６時側バンドの裏蓋
７胴部と１２時側バンドを接続するヒンジ
８胴部と６時側バンドを接続するヒンジ
９スイッチ
１０スピーカ
１１マイクロホン
１２表示窓
２０スピーカ収納室
２０ａスピーカ収納室の円筒状開口
２０ｂスピーカ収納室の底面
２１円筒状スピーカ筐体
２１ａ上部環状段部
２１ｂ下部環状段部
２１ｃ環状底部
２２スピーカ振動板
２３ボイスコイル
２４磁気回路構成部材
２４ａ環状溝
２４ｂ環状突起
２５板バネ
２５ａリング状の外側板バネ
２５ｂリング状の内側板バネ
２５ｃリング状の接続用板バネ
２６クッション
２７背面音響空間
Ｐ放音口
Ｑ受音口
Ｒ接着剤[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waterproof structure for a diaphragm type speaker provided in a portable electronic device such as a wristwatch type cellular phone.
[0002]
[Prior art]
Small portable electronic devices such as mobile phones, especially portable electronic devices such as wristwatch-type mobile phones that are worn on the wrist, are often used in the rain or come in contact with water due to hand washing. It is required to adopt a structure. This is because in a portable device having no waterproof performance or low waterproof performance, water easily enters the device, which causes a failure.
[0003]
By the way, in a general electronic device including a diaphragm type speaker, the opening of the speaker storage chamber formed in the device housing is closed by a lid member, but is not completely sealed. The lid member is formed with a large-diameter speaker mounting hole and a small-diameter through hole. The speaker is fixed to the lid member by closing the speaker mounting hole with a speaker diaphragm. Through the small-diameter through hole, the speaker storage chamber is always kept at the pressure of the outside air. However, such an imperfect sealing structure has a low waterproof performance, and water easily enters the device, which causes a failure.
[0004]
Therefore, a completely sealed, waterproof diaphragm type speaker has been developed. This conventional completely sealed speaker with a waterproof structure is provided with a pressure adjusting chamber in the speaker housing chamber whose volume changes according to the pressure of the outside air and the internal pressure without providing the small-diameter through hole. is there. The pressure adjusting chamber is, for example, a rubber tube that is thinner and more flexible than the speaker diaphragm. Such a completely sealed structure in which the pressure adjusting chamber is provided is complicated, and it is difficult to fit it in a limited space such as a part of a portable device. Therefore, there is a problem that it cannot be adopted for a small portable electronic device that cannot form a large volume speaker storage chamber (see, for example, Patent Document 1).
[0005]
In addition, a completely sealed waterproof speaker using a resin deformation membrane as a waterproof membrane has already been disclosed. In this completely sealed waterproof speaker, the opening of the speaker storage chamber is liquid-tightly closed with the deformation film. The piezoelectric speaker is bonded to the back side of the deformable membrane, that is, the surface of the inner waterproof region (see, for example, Patent Document 2).
[0006]
There is also disclosed a completely sealed waterproof speaker in which the opening of the speaker storage chamber is closed with a waterproof film and a breathable protective member for restricting deformation of the waterproof film is provided in the speaker storage chamber. However, a completely sealed waterproof speaker using such a waterproof membrane has a problem that the presence of the waterproof membrane causes deterioration in acoustic performance (see, for example, Patent Document 3).
[0007]
[Patent Document 1]
JP-A-11-331967 [Patent Document 2]
JP 2001-36982 A [Patent Document 3]
Japanese Patent Laid-Open No. 2001-128272
[Problems to be solved by the invention]
The problem to be solved by the present invention is to provide a portable electronic device including a diaphragm type speaker that maintains high waterproof performance in a daily life environment without deteriorating acoustic performance.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, a portable electronic device in which a diaphragm type speaker including a speaker diaphragm of a waterproof wave type diaphragm, a voice coil, and a magnetic circuit constituent member is stored in a speaker storage chamber formed in a device casing. in equipment, the loudspeaker diaphragm that so as to function as a waterproofing membrane to form a fully enclosed speaker housing chamber capped with a lid member, and the speaker enclosure to allow moving the magnetic circuit constituting members in the axial direction The speaker diaphragm is made to function as a pressure adjusting film by being held on the body.
[0010]
That is, a portable electronic device provided with a diaphragm type speaker that solves the above problem stores a diaphragm type speaker provided with a speaker diaphragm of a wave type diaphragm in a speaker storage chamber formed in a device casing, and the speaker storage unit. This is a portable electronic device in which the chamber is a completely sealed type that is covered with a lid member so that the speaker diaphragm functions as a waterproof film.
The diaphragm-type speaker includes a cylindrical speaker housing, and a corrugated waterproof resin-diaphragm speaker diaphragm in which an outer peripheral edge is fixed to the upper opening of the cylindrical speaker housing and swells to the outside. A concentric cylindrical voice coil attached to the back surface of the speaker diaphragm; and a concentric cylindrical voice coil disposed opposite the voice coil to form a magnetic path of the voice coil and seat the speaker diaphragm when water pressure is applied A magnetic circuit component that functions as a seating surface, and a spring member that is movable in the axial direction and is held by the cylindrical speaker housing.
[0011]
In the portable electronic device including the diaphragm type speaker, the seating surface of the magnetic circuit constituent member is a flat surface on which the back surface of the resin speaker diaphragm is seated when high water pressure is applied.
[0012]
In the portable electronic device including the diaphragm type speaker, the resin speaker diaphragm is bonded to a cylindrical opening formed in the lid member with a flexible waterproof adhesive.
[0013]
In the portable electronic device including the diaphragm type speaker, the magnetic circuit constituent member is held at three points by the three leaf springs in the cylindrical speaker case.
[0014]
In the portable electronic device including the diaphragm type speaker, the cover member that covers a part of the device case has a plurality of sound emission ports and a back surface corresponding to the upper opening of the cylindrical speaker case. Is composed of a horizontal flat surface at the center and an inclined surface at the periphery.
[0015]
In the portable electronic device including the diaphragm type speaker, the diaphragm type speaker is placed on the bottom surface of the speaker storage chamber via an annular buffer member.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view of a wristwatch type mobile phone to which a waterproof diaphragm type speaker 10 of the present invention is applied. In FIG. 1, the device casing of the wristwatch type mobile phone is a main body case portion in which a functional portion including an electronic circuit is accommodated, a 12 o'clock side band portion in which a diaphragm type speaker 10 is accommodated, and a microphone 11 in which a microphone 11 is accommodated. It is composed of an hour band part, a 12 o'clock side hinge 7 that connects the main body case part and the 12 o'clock side band part, and a 6 o'clock side hinge 8 that connects the main body case part and the 6 o'clock side band part. It is a thing.
[0017]
The main body case part is composed of a body part main body 1 and a back cover 4 thereof, the 12 o'clock side band part is composed of a 12 o'clock side band main body 2 and its back cover 5, and the 6 o'clock side band part Consists of a 6 o'clock side band body 3 and its back cover 6. The trunk body 1 is provided with a display window 12 such as a liquid crystal panel. An operation button 9 is provided on the 6 o'clock side band body 3.
[0018]
The microphone storage chamber in which the microphone 11 is stored is a storage chamber having an opening having a predetermined shape and size formed in the 6 o'clock side band body 3. A sound receiving port Q of the microphone 11 is formed on the back cover 6 of the 6 o'clock side band.
[0019]
The speaker storage chamber 20 is formed by closing a bottomed cylindrical chamber formed in the 12:00 side band body 2 with a back cover 5. The only opening of the speaker storage chamber in which the diaphragm type speaker 10 is stored is the opening of the bottomed cylindrical chamber. A speaker sound outlet P is formed in the back cover 5 of the 12 o'clock side band.
[0020]
In the waterproof structure of the speaker of the first embodiment shown in FIGS. 2 to 4, the diaphragm type speaker 10 is an electrodynamic type speaker, and the upper annular step portion 21a, the lower annular step portion 21b, and the annular bottom portion 21c are inner peripheral surfaces. A cylindrical speaker casing 21 formed on the outer periphery, a waterproof resin speaker diaphragm 22 having an outer peripheral end fixed to the upper annular step portion 21 a of the cylindrical speaker casing 21, and a back surface of the speaker diaphragm 22. A fixed concentric cylindrical voice coil 23, a magnetic circuit component member 24 that is magnetically coupled to the voice coil 23 to which an audio signal current is input, and a magnetic circuit component member 24 are arranged in a lower annular shape of the cylindrical speaker housing 21. It is comprised with the leaf | plate spring 25 hold | maintained at the step part 21b.
[0021]
The waterproof resin speaker diaphragm 22 is a waterproof corrugated diaphragm having a plurality of concentric concavities and convexities and generally bulging outward. That is, in the resin speaker diaphragm 22, the surface between the mounting position of the voice coil 23 and the outer peripheral end is curved to the front side, and the surface between the mounting position of the voice coil 23 and the central portion is also curved to the front side. As a result, the central surface is recessed inward. Therefore, the corrugated resin speaker diaphragm 22 has a plurality of irregularities between the ends of the longitudinal section passing through the center. In this embodiment, the speaker diaphragm of a diaphragm type speaker used for a small portable electronic device is formed of a polyimide film having a thickness of 38 μm.
Of course, the material and thickness of the diaphragm are not limited to this, and any material having waterproofness and flexibility can be applied.
[0022]
The magnetic circuit constituting member 24 shown by a block is a disk-shaped magnetic member in which a permanent magnet (not shown) is incorporated. For example, the disk-shaped permanent magnet is fixed to a magnetic yoke. The magnetic circuit component member 24 is formed with an annular groove 24a through which the concentric cylindrical voice coil 23 comes in and out. Further, an annular protrusion 24 b is formed at the upper part of the outer peripheral surface of the magnetic circuit component member 24. The magnetic circuit component member 24 is movable in the axial direction by a leaf spring 25 disposed between the annular projecting portion 24b and the lower annular step portion 21b of the cylindrical speaker housing 21, and is attached to the cylindrical speaker housing 21. Is retained.
[0023]
In the present invention, the magnetic circuit component member 24 is one of electroacoustic conversion members that are magnetically coupled to the voice coil 23 to which the audio signal current is input and vibrate the resin speaker diaphragm 22, which will be described later. Thus, the resin speaker diaphragm 22 functions as a protective member when it is swollen inward by receiving water pressure.
[0024]
The diaphragm type speaker 10 is stored in a speaker storage chamber 20 of a bottomed cylindrical chamber formed in the 12:00 side band body 2. The diaphragm type speaker 10 is fixed to the device case by holding the upper and lower ends of the cylindrical speaker case 21 between the back cover 5 of the 12 o'clock side band and the 12 o'clock side band body 2 to which the cushion 26 is fixed. Has been. That is, the diaphragm type speaker 10 is housed in the speaker housing chamber 20 so that the annular bottom portion 21c of the cylindrical speaker housing 21 abuts on the cushion 26, and the upper end portion of the cylindrical speaker housing 21 is It is held by the back cover 5 of the 12 o'clock side band. The back cover 5 is formed with one sound emission port 5 a having a diameter slightly smaller than the speaker diaphragm 22 of the diaphragm type speaker 10.
[0025]
The back cover 5 of the 12 o'clock side band is fitted and fixed to the 12 o'clock side band body 2, but the back cover 5 of the 12 o'clock side band is also fitted to the cylindrical speaker housing 21. That is, the back cover 5 of the 12 o'clock side band is formed with an inner annular protrusion 5b and an outer annular protrusion 5c for fitting into the speaker storage chamber 20. The upper end portion of the cylindrical speaker casing 21 is fitted between the annular projections 5b and 5c. Adhesive R is filled in the fitting surfaces of the inner annular protrusion 5 b, the outer annular protrusion 5 c, and the upper end portion of the cylindrical speaker housing 21. The adhesive R is also applied to an annular portion where the outer peripheral portion of the surface of the resin speaker diaphragm 22 and the inner peripheral surface of the opening 5a of the back cover 5 of the 12:00 band are in contact.
[0026]
In this way, the diaphragm type speaker 10 is housed and fixed in the 12 o'clock side band which is a device housing, and the opening of the speaker housing chamber 20 formed in the 12 o'clock side band body 2 is liquid-tightly sealed. Has been. Although not shown in the drawing, a necessary waterproof seal is applied to the engaging portion between the 12 o'clock side band body 2 and the back cover 5 in addition to the waterproof seal portion with the adhesive R. Therefore, the speaker storage chamber 20 is completely sealed, and the diaphragm type speaker 10 stored and fixed in the 12 o'clock side band is a completely sealed waterproof speaker.
[0027]
The cushion 26 is an annular buffer member fixed to the bottom surface 20b of the speaker storage chamber 20 with an adhesive or the like, and is made of silicon rubber or the like. The cushion 26 is a buffer member that acts so that the speaker 10 does not peel from the back cover 5 of the 12 o'clock side band when water pressure is applied. That is, when water pressure is applied, the speaker 10 is pushed down, and a downward force is applied so that the cylindrical speaker housing 21 is peeled off from the inner peripheral surface of the outer annular protrusion 5c of the 12 o'clock side band back cover 5, The cushion 26 resists this and applies an upward force to the cylindrical speaker housing 21. By such an action of the cushion 26, the speaker 10 does not peel off from the back cover 5 of the 12 o'clock side band even when water pressure is applied.
[0028]
The cushion 26 is formed in an annular shape as described above. This is because the volume of the back acoustic space 27 is increased as much as possible in a narrow internal space of the speaker storage chamber 20 formed in the device casing of a small portable electronic device, and predetermined acoustic performance is ensured.
[0029]
As shown in a plan view in FIG. 3, the leaf spring 25 that holds the magnetic circuit component member 24 on the lower annular step portion 21b of the cylindrical speaker housing 21 is a ring-shaped outer leaf spring 25a and a ring-shaped inner leaf spring 25b. , A three-point holding plate spring composed of a ring-shaped connecting plate spring 25c. The ring-shaped inner leaf spring 25b is higher than the ring-shaped outer leaf spring 25a. Therefore, the ring-shaped connection leaf spring 25c connecting them is inclined. The cross-sectional views of the leaf spring 25 shown in FIGS. 2, 4, 5, and 6 are cross-sectional views taken along line AA ′ of FIG.
[0030]
Note that the spring member that holds the magnetic circuit component member 24 in the axial direction so as to be movable in the axial direction is not limited to the three-point holding type plate spring 25, and two or more spring members are held at a plurality of points. I can do it. For example, an ordinary coil spring can be used. In this case, the magnetic circuit constituent member 24 is fitted into the inner diameter portion of the coil spring so that the magnetic circuit constituent member 24 can be moved and held in the cylindrical speaker casing 21.
[0031]
In the first embodiment of the present invention configured as described above, the corrugated speaker diaphragm 22 is deformed and comes into contact with the upper surface of the magnetic circuit component member 24 when water pressure is applied. In a state where a higher water pressure is applied, the magnetic circuit component member 24 moves in the direction in which the leaf spring 25 is compressed by the water pressure applied to the wave type speaker diaphragm 22. The amount of movement of the magnetic circuit constituent member 24 is up to the upper surface of the annular bottom 21c, which is a contact position provided in the cylindrical speaker housing 21. That is, the magnetic circuit component member 24 moves from the position shown in FIG. 2 to the position shown in FIG. 4 with the wave speaker diaphragm 22 seated. In other words, from the size shown in FIG. 2 in a state where the water pressure is not applied, the internal volume of the speaker storage chamber 20 that is completely sealed is subjected to a high water pressure and the maximum movement amount of the magnetic circuit component member 24 is regulated. The state is compressed to the size shown in FIG.
[0032]
Due to this compressed volume, the internal pressure of the speaker storage chamber 20 rises and balances with the water pressure applied to the corrugated speaker diaphragm 22. Therefore, the wave type speaker diaphragm 22 only deforms, and the material does not stretch and plastically deform.
[0033]
At a higher water pressure than this, the portion of the magnetic circuit component member 24 where the wall does not exist, that is, the outer peripheral portion where the wave type speaker diaphragm 22 is not seated on the magnetic circuit component member 24 is in a state that can withstand the water pressure. Since the internal pressure of the speaker storage chamber 20 increases due to the deformation of the speaker diaphragm 22, the difference in pressure applied to the front and back surfaces of the wave speaker diaphragm 22 is reduced. Therefore, by adopting an appropriate material and shape, the outer peripheral portion where the wave type speaker diaphragm 22 is not seated on the magnetic circuit component member 24 is not plastically deformed in the usage range. Thus, the waterproof wave type speaker diaphragm 22 can withstand a relatively high water pressure with a configuration in which the three functions of the waterproof film, the pressure adjusting film, and the speaker diaphragm function simultaneously.
[0034]
In short, the magnetic circuit component member 24 is fixed by the spring 25 when operating as a speaker, but supports the deformation of the speaker diaphragm 22 and the wave speaker vibration when water pressure is applied to the wave speaker diaphragm 22. It functions as a protective member that prevents plastic deformation of the plate 22. As a result, the wave type speaker diaphragm 22 that is supported and deformed by the magnetic circuit constituent member 24 functioning as a protective member functions as a waterproof film and also functions as a pressure adjusting film.
[0035]
When the water pressure is removed, the magnetic circuit component member 24 is moved to the original position by the elasticity of the spring 25, and the wave speaker diaphragm 22 is restored to the original shape. Therefore, the acoustic performance of the speaker is not impaired.
[0036]
Next, the waterproof structure of the second embodiment shown in FIGS. 5 and 6 is the same as the waterproof structure of the first embodiment described above, but is provided with a means for preventing plastic deformation in a high temperature environment of the speaker diaphragm. . That is, in the waterproof structure of the first embodiment described above, the back cover 5 that covers the 12 o'clock side band main body 2 in which the speaker storage chamber 20 is formed has one sound emission having a slightly smaller diameter than the speaker diaphragm 22. It is a lid member in which a mouth P is formed. On the other hand, in the waterproof structure of the second embodiment, the back cover 5 that covers the 12 o'clock side band body 2 in which the speaker storage chamber 20 is formed has a plurality of diameters that are much smaller than the speaker diaphragm 22. This is a lid member in which a sound emission port P is formed. In addition, the back surface of the portion of the back cover 5 where the plurality of sound emission ports P are formed is composed of a central portion 5b of a horizontal flat surface and a peripheral portion 5c of an inclined surface.
[0037]
With such a configuration, when the air inside the speaker storage chamber 20 undergoes volume expansion under a high temperature environment, the corrugated speaker diaphragm 22 further swells from the state of FIG. 5 and finally becomes the state of FIG. The distance between the back surface of the lid member 5 on which the plurality of sound emission ports P are formed and the front surface of the corrugated speaker diaphragm 22 is determined in consideration of the state where the corrugated speaker diaphragm 22 expands to the maximum in the operating temperature range. It has been. Therefore, the corrugated speaker diaphragm 22 swelled in a high temperature environment is prevented from further bulging because the back surface of the lid member 5 on which the plurality of sound emission ports P are formed becomes a wall. In this way, even if there is an expansion of the air volume inside the speaker storage chamber 20 and a pressure increase associated therewith in a high temperature environment, the wave type speaker diaphragm 22 is only deformed and not plastically deformed.
[0038]
When the temperature returns from the high temperature environment to room temperature, the corrugated speaker diaphragm 22 is immediately restored to its original shape, so that the speaker performance is not impaired.
[0039]
【The invention's effect】
According to the present invention, it is possible to provide a portable electronic device including a diaphragm type speaker that maintains high waterproof performance in an everyday life environment without deteriorating acoustic performance. Moreover, in the portable electronic device provided with the diaphragm type speaker according to the present invention, the waterproof speaker is configured to function the wave type speaker diaphragm also as a waterproof film and a pressure adjusting film. Is a relatively simple and low cost waterproof speaker. Accordingly, a waterproof speaker suitable for a particularly small portable electronic device can be realized.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embodiment of a wristwatch type mobile phone to which the present invention is applied.
FIG. 2 is a cross-sectional view of a main part of a wristwatch type mobile phone provided with the diaphragm type speaker of the first embodiment.
FIG. 3 is a plan view of an embodiment of a leaf spring that holds a speaker diaphragm of a diaphragm type speaker.
FIG. 4 is a cross-sectional view of a main part of a wristwatch type mobile phone including the diaphragm type speaker according to the first embodiment when high water pressure is applied.
FIG. 5 is a cross-sectional view of a main part of a wristwatch type mobile phone including a diaphragm type speaker according to a second embodiment.
FIG. 6 is a cross-sectional view of a main part of a wristwatch type mobile phone provided with a diaphragm type speaker according to a second embodiment when high water pressure is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Body part main body 2 12 o'clock side band main body 3 6 o'clock side band main body 4 Body part back cover 5 12 o'clock side band back cover 5a Opening 5b Inner annular protrusion 5c for fitting Outer annular protrusion 6 6 for fitting Back cover of hour side band 7 Hinge connecting the body and 12 o'clock side band 8 Hinge connecting the body and 6 o'clock side band 9 Switch 10 Speaker 11 Microphone 12 Display window 20 Speaker storage chamber 20a Cylindrical shape of the speaker storage chamber Opening 20b Bottom surface 21 of speaker storage chamber Cylindrical speaker housing 21a Upper annular step 21b Lower annular step 21c Annular bottom 22 Speaker diaphragm 23 Voice coil 24 Magnetic circuit component 24a Annular groove 24b Annular protrusion 25 Plate spring 25a Ring shape Outer leaf spring 25b Ring-like inner leaf spring 25c Ring-like leaf spring 26 for connection 26 Cushion 27 Back acoustic space P Sound outlet Q Sound ports R adhesive

Claims

In a portable electronic device in which a diaphragm type speaker including a speaker diaphragm of a wave type diaphragm, a voice coil, and a magnetic circuit constituent member is housed in a speaker housing chamber formed in a device housing, the speaker diaphragm is used as a waterproof film to the formation of the fully enclosed speaker housing chamber capped with a lid member so as to function, and the speaker diaphragm by holding the speaker enclosure to allow moving the magnetic circuit constituting members in the axial direction A portable electronic device having a diaphragm type speaker characterized by functioning also as a pressure adjusting film.

A diaphragm type speaker having a wave diaphragm diaphragm is housed in a speaker housing chamber formed in a device housing, and the speaker housing chamber is covered with a lid member so that the speaker diaphragm functions as a waterproof film. In a completely sealed portable electronic device,
The diaphragm type speaker includes a cylindrical speaker case, a speaker diaphragm of a wave-type waterproof resin diaphragm having an outer peripheral edge fixed to an upper opening of the cylindrical speaker case and bulging substantially outward, and the speaker A concentric cylindrical voice coil attached to the back surface of the diaphragm, and a seating surface disposed opposite to the voice coil to form a magnetic path of the voice coil and to seat the speaker diaphragm when water pressure is applied A diaphragm type speaker comprising: a magnetic circuit constituent member that functions as a magnetic member; and a spring member that is movable in the axial direction and is held in the cylindrical speaker casing. Portable electronic device equipped.

3. The portable electronic device with a diaphragm type speaker according to claim 2, wherein the seating surface of the magnetic circuit component member is a flat surface on which the back surface of the resin speaker diaphragm is seated when high water pressure is applied. machine.

3. The portable electronic device having a diaphragm type speaker according to claim 2, wherein the cylindrical speaker case is bonded to a lid member of the speaker storage chamber with a waterproof adhesive.

3. The portable electronic device having a diaphragm type speaker according to claim 2, wherein the magnetic circuit component member is held at a plurality of points by a plurality of leaf springs in the cylindrical speaker casing.

The opening of the speaker storage chamber is a cover member in which a plurality of sound emission ports are formed, and the center part of the back surface is covered with a cover member that is a flat surface and the peripheral edge portion is an inclined surface. A portable electronic device comprising the diaphragm type speaker according to claim 2.

7. The portable electronic device having a diaphragm type speaker according to claim 6, wherein the cover member is formed integrally with a part of the device casing.

3. The portable electronic device with a diaphragm type speaker according to claim 2, wherein the diaphragm type speaker is placed on a bottom surface of the speaker storage chamber via an annular buffer member.