JP2019134393A - Speaker device - Google Patents

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JP2019134393A
JP2019134393A JP2018031333A JP2018031333A JP2019134393A JP 2019134393 A JP2019134393 A JP 2019134393A JP 2018031333 A JP2018031333 A JP 2018031333A JP 2018031333 A JP2018031333 A JP 2018031333A JP 2019134393 A JP2019134393 A JP 2019134393A
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speaker
diaphragm
curved
short
jig
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JP6767001B2 (en
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正 早出
Tadashi Hayade
正 早出
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正 早出
Tadashi Hayade
正 早出
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Abstract

To provide a method of manufacturing a speaker device that generates excellent musical sounds by vibrating a back of a diaphragm to which stress is applied by bending a rectangular plate with one electromagnetic drive unit, and a speaker manufactured by the same.SOLUTION: In a speaker device having a diaphragm to which a bending stress is applied, with a short side of a rectangular plate being curved so that a compression side is a front, and the short side being inserted into a chordal side of the plurality of fixing members, a center part of both ends of a long side is fixed to a speaker housing with a jig. Further, the diaphragm has a structure in which the back portion of the diaphragm is directly connected by a vibration device by a driving rod.SELECTED DRAWING: Figure 1

Description

本発明は、薄板木材を曲げて応力が付加された軽量振動板の背部を電磁ドライバで振動させ、楽音を発するスピーカの製造方法、ならびにこの製造方法により製造されたスピーカに関するものである。  The present invention relates to a method of manufacturing a speaker that emits a musical sound by bending the back of a lightweight diaphragm to which a stress is applied by bending a thin plate wood with an electromagnetic driver, and a speaker manufactured by this manufacturing method.
平板を曲げた振動板を有するスピーカには種々のものが存在するが、例えば特願2004−120517のようにハニカム構造板をムービングコイルで振動させるものや、同じくハニカム板を圧電振動子で振動させる特許第5888294などがあるが、湾曲させるための加圧機構が複雑となったり、発する音響の周波数帯域が狭く、広域においてフラットで豊かな音響を発することが困難とされている。一方、特開2000−354294の木材平面板を曲げて多数のリブで湾曲を固着し、複数のムービングコイルで振動させて、優れた楽音を発するハイエンドのスピーカが存在するが、多数のリブで構成する振動板の構造が精緻かつ複雑なため、製造コストがかかり、極めて高価な製品となっている。  There are various types of speakers having a diaphragm with a bent plate. For example, as in Japanese Patent Application No. 2004-120517, a honeycomb structure plate is vibrated with a moving coil, or a honeycomb plate is vibrated with a piezoelectric vibrator. There are patents 5888294 and the like, but the pressurizing mechanism for bending is complicated, the frequency band of sound to be emitted is narrow, and it is difficult to emit flat and rich sound in a wide area. On the other hand, there is a high-end speaker that emits excellent music by bending a wood flat plate disclosed in Japanese Patent Application Laid-Open No. 2000-354294 and fixing it with a large number of ribs and vibrating with a plurality of moving coils. Since the structure of the vibrating plate is elaborate and complicated, the manufacturing cost is high and the product is extremely expensive.
またスピーカの振動板や筐体にバイオリンやギターなどの弦楽器に使われるドイツトウヒや楓、ローズウッドなどの木材を使用するものは、材料が高価となったり、入手が困難なため量産には適さない。  In addition, materials that use wood such as German spruce, firewood, or rosewood, which are used for string instruments such as violins and guitars, are suitable for mass production because the materials are expensive and difficult to obtain. Absent.
特開2004−120517JP 2004-120517 A 特開2000−354294JP 2000-354294 A 特許第5888294号Patent No. 5888294
発明が解決しようとする課題Problems to be solved by the invention
これらの平面ハニカム板を曲げたスピーカの一部では、平面を曲げて湾曲形状とするのにスプリングなど複雑な加圧機構とするため、使用期間中に、振動板に歪が発生したり、加圧量が変化することにより、内部応力が変化し、音質が安定しないという課題があった。  Some of the speakers with these planar honeycomb plates bent use a complicated pressurizing mechanism such as a spring to bend the plane into a curved shape. When the amount of pressure changes, the internal stress changes and the sound quality is not stable.
一方、平板を湾曲させ、多数のリブを組み合わせて接着剤で固着させた振動板を複数のムービングコイルで駆動させるスピーカにおいては、耐久性や剛性の維持は確保されとともに、低音から高音まで豊かで優れた音響性能が得られるが、多数のリブを組み合わせて固着させる製造工程が複雑なため、極めてコスト高となる課題があった。  On the other hand, in a loudspeaker that is driven by multiple moving coils with a diaphragm that has a curved plate and a combination of a number of ribs and is fixed with adhesive, durability and rigidity are maintained, and it is rich from bass to treble. Although excellent acoustic performance can be obtained, there is a problem that the cost is extremely high because the manufacturing process for combining and fixing a large number of ribs is complicated.
課題を解決するための手段Means for solving the problem
本発明は上記のことを鑑み提案されたもので、その目的とするところは、薄くて軽量の湾曲した木製振動板の短辺を複数個の固定部材の弦状側面に挿入し、曲げ応力が付加された曲面の振動板を保持しつつ、さらに振動板の長辺両端辺に設けた、2本の切込み溝を有する中央部を治具により筐体に固定した後、振動板の背部中央を電磁振動ドライバーユニットと直結した駆動棒により振動を伝え、応答性が良く、かつ繊細で明瞭な音質を持つスピーカを、入手しやすい木材を使って、安価に製造する方法ならびにその製造方法により製造されたスピーカを提供することにある。  The present invention has been proposed in view of the above, and an object of the present invention is to insert a short side of a thin and light curved wooden diaphragm into the chordal side surfaces of a plurality of fixing members, so that bending stress is reduced. While holding the added curved diaphragm, the center part with two cut grooves provided on both ends of the longer side of the diaphragm is fixed to the housing with a jig, and then the center of the back part of the diaphragm is fixed. Produced by a low-cost method of manufacturing loudspeakers with good responsiveness, delicate and clear sound quality using easily available wood, and the manufacturing method. It is to provide a speaker.
スピーカの振動板は、一般に知られているようにE/ρ式で示されるように、密度ρが小さく、すなわち軽くて、剛性Eが高いことが望ましい。平面スピーカの振動板の材料として、一般的には比重が非常に小さく、軟らかく加工のし易いバルサー材が使用されている。  As is generally known, the diaphragm of the speaker desirably has a low density ρ, that is, it is light and has a high rigidity E, as shown by the E / ρ formula. As a material for a diaphragm of a flat speaker, a balser material that has a very small specific gravity and is easy to process is generally used.
本発明では、木材として汎用材の中から、比重が比較的小さく、曲げ弾性率の大きな檜や杉、また千年の年代にわたり地中で埋もれて緻密化した古木である神代杉を振動板として選択した。  In the present invention, wood and cedar having a relatively small specific gravity and a large flexural modulus were selected as the wood from the general-purpose wood as a wood, and Kamishiro cedar, which is an old tree that has been buried in the ground over the millennia, as a diaphragm. .
さらにこれらの緻密質の薄板を曲げて、圧縮側が外向きになるよう曲げて、振動板の表面の緻密化を図ると同時に、湾曲により応力を付加された振動板とした。  Further, these dense thin plates were bent so that the compression side faced outward, thereby densifying the surface of the diaphragm, and at the same time, a diaphragm to which stress was applied by bending was obtained.
また湾曲した長方形の長辺両端を筐体に固定する構造として、固定部分を湾曲の中心部とし、かつ固定部分の両端に各2本の切込み溝を設け、固定により振動板全体の振動が妨げられない構造とした。この構造により振動板は治具固定部を除く振動板全体が電磁ドライバの振動により、バランスよく共振する構造とした。  In addition, both ends of the long side of the curved rectangle are fixed to the housing. The fixed part is the central part of the curve, and two cut grooves are provided at both ends of the fixed part. The structure was not possible. With this structure, the entire diaphragm excluding the jig fixing part is configured to resonate in a well-balanced manner by the vibration of the electromagnetic driver.
以下、図面に沿って本発明のスピーカ製造方法により製造されるスピーカの1実施例について説明する。  Hereinafter, an embodiment of a speaker manufactured by the speaker manufacturing method of the present invention will be described with reference to the drawings.
図1は本発明の一実施例の要部構成を示す。図1において符号1で示すものは80mm×300mmの振動板である。この振動板1は、厚み1mmから1.5mmの矩形の薄板で構成され、湾曲させて応力が付加された状態で、図3に示すように、固定部材3A、3B、3Cの弦状側面に挿入し、弦状側面と接着剤で固着させる。  FIG. 1 shows the configuration of the main part of one embodiment of the present invention. In FIG. 1, what is indicated by reference numeral 1 is a diaphragm of 80 mm × 300 mm. The diaphragm 1 is formed of a rectangular thin plate having a thickness of 1 mm to 1.5 mm, and is curved and applied with stress to the chordal side surfaces of the fixing members 3A, 3B, and 3C as shown in FIG. Insert and fix with string side and adhesive.
また図2に示すように湾曲した振動板の長辺両端中央部を治具4によってスピーカ筐体2に固定する。好ましくは長辺両端中央部に各2本の切込み溝7を設け、その中央の穴8を治具4によってスピーカ筐体2に固定する。  Further, as shown in FIG. 2, the center part of both ends of the long side of the curved diaphragm is fixed to the speaker housing 2 by the jig 4. Preferably, two cut grooves 7 are provided at the center of both ends of the long side, and a hole 8 at the center is fixed to the speaker housing 2 by the jig 4.
この2本の切込み溝7の形状は、幅1〜3mm、間隔ピッチを10〜30mm、長さ30〜70mmとする。溝を設けずに振動板を筐体に固定する方法より、溝を設けた構造の方がより音質に繊細さがあり、軟らかい音質となった。図2では幅2mm、間隔ビッチを20mm、長さを50mmとした。  The two cut grooves 7 have a width of 1 to 3 mm, an interval pitch of 10 to 30 mm, and a length of 30 to 70 mm. Compared to the method of fixing the diaphragm to the housing without providing a groove, the structure provided with the groove has a finer sound quality and a softer sound quality. In FIG. 2, the width is 2 mm, the interval bitch is 20 mm, and the length is 50 mm.
なお治具で固定する際、筐体と振動板の間に木製スペーサ9を挿入し、筐体と振動板が直接接触しないようにした方がより好ましい。  When fixing with a jig, it is more preferable to insert a wooden spacer 9 between the casing and the diaphragm so that the casing and the diaphragm are not in direct contact.
振動板の短辺サイズを幅80mmの一定にして、長辺を270mmと300mmのサイズを選択して音質を比較したところ、周波数特性がフラットで滑らかなことやエコーが少ない点から、振動板の長辺サイズは短辺サイズの4倍以上が好ましい。  When the short side size of the diaphragm was fixed to 80 mm in width, and the long sides were selected to be 270 mm and 300 mm in size, the sound quality was compared. From the point that the frequency characteristics are flat and smooth and there are few echoes, The long side size is preferably at least four times the short side size.
図4はスピーカの上部から見た断面図である。  FIG. 4 is a cross-sectional view seen from the top of the speaker.
図5はスピーカ筐体の側面板を外し、内部構造が見えるようにした斜視図である。スピーカ音は湾曲した振動板の前面から発せられるが、振動板の振動によって生じた背圧を逃がすために開口部9が設けられている。  FIG. 5 is a perspective view in which the side plate of the speaker housing is removed so that the internal structure can be seen. The speaker sound is emitted from the front surface of the curved diaphragm, and an opening 9 is provided to relieve the back pressure generated by the vibration of the diaphragm.
また振動板の裏面から発生した音は筐体と振動板外周の狭い空間を通り、振動板前面からの音を打ち消さないように調整させつつ、スピーカ前面から出る構造とする。  Further, the sound generated from the rear surface of the diaphragm passes through a narrow space between the casing and the outer periphery of the diaphragm, and is adjusted so as not to cancel the sound from the front surface of the diaphragm, and is emitted from the front surface of the speaker.
図6はスピーカ装置の正面図である。  FIG. 6 is a front view of the speaker device.
表1に振動板に使用する木材の種類を変えたときの音質測定の結果を示す。  Table 1 shows the results of sound quality measurement when the type of wood used for the diaphragm is changed.
板材は比重が0.3〜0.5、曲げ弾性率が70000〜100000Kgf/cm2程度のものが好ましい。杉や檜はバイオリンやギターなどの弦楽器に使われるドイツトウヒやローズウッド、楓に比較して、入手しやすい身近な木材である。杉や檜は比重が0.4程度と比較的小さく、曲げ弾性率は75000〜90000Kgf/cm2と木目に沿って大きいため、本発明の振動板に用いると、演奏に用いられた楽器をきめ細かく再現する優れた音質を示した。また、特に神代杉においては、地中での長期の経年変化により、新材に比べて吸湿性が低下し、緻密質となっているため、弦楽器を忠実に再現する優れた音響特性が得られた。  The plate material preferably has a specific gravity of 0.3 to 0.5 and a flexural modulus of about 70,000 to 100,000 Kgf / cm 2. Cedar and camellia are familiar woods that are easier to obtain than German spruce, rosewood, and camellia, which are used for strings such as violins and guitars. Cedar and persimmon have a relatively small specific gravity of about 0.4 and a flexural modulus of 75000-90000 Kgf / cm2, which is large along the grain. When used in the diaphragm of the present invention, the musical instrument used for the performance is reproduced finely. Showed excellent sound quality. Also, especially in Kojiro cedar, due to the long-term secular change in the ground, the hygroscopicity is reduced compared to the new material and it has become dense, so excellent acoustic characteristics that faithfully reproduce stringed instruments were obtained. .
図7は本発明スピーカと高音域を担うツィータ10と低音域をカバーするウーハ12と本発明スピーカ11A、Bと組み合わせたシステム構成図である。  FIG. 7 is a system configuration diagram combining the speaker of the present invention, the tweeter 10 responsible for the high frequency range, the woofer 12 covering the low frequency range, and the speakers 11A and 11B of the present invention.
表1で示すように、木製振動板の木材の種類により音質が変わるので、異なる材質のスピーカ11Aと11Bのように本スピーカを2台並べて、スイッチにより切り替えることにより、ピアノや弦楽器や打楽器など演奏に用いる楽器の種類やオーケストラ編成に合わせた音響効果を選択することが出来る。  As shown in Table 1, the sound quality changes depending on the wood type of the wooden diaphragm, so two speakers such as speakers 11A and 11B of different materials are arranged side by side and switched by a switch to play piano, stringed instruments, percussion instruments, etc. Sound effects can be selected according to the type of instrument used for the orchestra and the orchestra organization.
発明の効果Effect of the invention
以上に説明した本発明のスピーカの周波数特性を代表的なオーディオ用ダイナミックスピーカ装置ならびに既存の木製湾曲振動板を用いたオーディオ用スピーカ装置と比較した結果を図8に示す。  FIG. 8 shows a result of comparing the frequency characteristics of the speaker of the present invention described above with a typical audio dynamic speaker device and an audio speaker device using an existing wooden curved diaphragm.
図8においてダイナミックタイプに比べて本発明スピーカは中高音域の立ち上がりが優れている。また既存の木製湾曲振動板スピーカと比較すると同じく中高音域の音の落ち込みが小さい結果を示した。  In FIG. 8, the loudspeaker of the present invention is superior in the mid-high range compared to the dynamic type. Compared with the existing wooden curved diaphragm speaker, the result showed that the sound drop in the mid-high range was small.
実際に耳で試聴した音質評価の比較を表2に示す。  Table 2 shows a comparison of sound quality evaluations actually heard by ear.
表2は本発明のスピーカの総合的な音質をダイナミックタイプならびに湾曲振動板のオーディオスピーカと比較したものである。本発明のスピーカから再生される音は演奏に使われる楽器の特徴を再現し易いこと、また湾曲効果により音が前方に向かって出る感じがあること、さらに残響が少ないなどの特徴を有することが判明した。  Table 2 compares the overall sound quality of the speaker of the present invention with that of a dynamic type and a curved diaphragm audio speaker. The sound reproduced from the speaker of the present invention can easily reproduce the characteristics of the musical instrument used for performance, has a feeling that the sound is emitted forward due to the bending effect, and has characteristics such as less reverberation. found.
以上の説明で明らかなように、本発明は、身近な汎用の木材や古木などの木材を使用した振動板を湾曲させて、長辺両端中央部を木製筐体に取り付け、その背部をドライバの駆動を振動板の背面に直結させるというシンプル構造から、高級オーディオ用スピーカと同等以上の音響品質を再生するスピーカ装置を安価に製造できる方法ならびにその製造方法で製造されたスピーカを提供するものである。  As is apparent from the above description, the present invention curves a diaphragm using familiar general-purpose wood or old wood, and attaches the middle part of both long sides to a wooden casing, and the back part of the driver is The present invention provides a method for inexpensively manufacturing a speaker device that reproduces an acoustic quality equivalent to or higher than that of a high-quality audio speaker from a simple structure in which the drive is directly coupled to the back surface of the diaphragm, and a speaker manufactured by the manufacturing method. .
本発明の一実施例のスピーカの振動板全体の構造を示す。The structure of the whole diaphragm of the speaker of one Example of this invention is shown. 同スピーカの振動板の取付工程を示す。The attachment process of the diaphragm of the speaker is shown. 同スピーカの振動板と固定部材を示す。The diaphragm and fixing member of the speaker are shown. 同スピーカの上面から見た断面図を示す。Sectional drawing seen from the upper surface of the speaker is shown. 同スピーカの側面板を外した斜視図であるIt is the perspective view which removed the side plate of the speaker 同スピーカの正面図を示す。A front view of the speaker is shown. 異なる木材の振動板を用いた同スピーカ2台と、ツィータとウーハにより、システムを構成した図を示す。The figure which comprised the system by the two speakers which used the diaphragm of a different timber, tweeter, and woofer is shown. 同スピーカとタイプの異なるオーディオ用スピーカと周波数特性を比較したグラフを示す。The graph which compared the frequency characteristic with the speaker for audios of a different type from the same speaker is shown.
1 振動板
2 筐体
3 固定部材
4 固定治具
5 ドライバ
6 駆動棒
7 切込み溝
8 取付穴
9 スペーサ
10 ツィータ
11 本発明スピーカ
12 ウーハ
DESCRIPTION OF SYMBOLS 1 Diaphragm 2 Case 3 Fixing member 4 Fixing jig 5 Driver 6 Drive rod 7 Cut groove 8 Mounting hole 9 Spacer 10 Tweeter 11 Invention speaker 12 Woofer

Claims (5)

  1. 長方形の板材の短辺が圧縮側が前部になるよう湾曲され、短辺側面が複数個の固定部材の弦状側面に挿入されて、曲げ応力が付加された曲面の振動板を有するスピーカ装置であって、振動板の長辺の両端辺の中央部分が治具によって匡体に固定された振動板を有するスピーカ装置。  A speaker device having a curved diaphragm in which a short side of a rectangular plate material is curved so that the compression side is the front side, and a short side surface is inserted into a chordal side surface of a plurality of fixing members to which bending stress is applied. A speaker device having a diaphragm in which center portions of both ends of a long side of the diaphragm are fixed to a housing by a jig.
  2. 長辺の両端辺の中央部分の治具固定部分の両端に切込み溝を有する請求項1に記載のスピーカ装置。  The speaker device according to claim 1, wherein the speaker device has cut grooves at both ends of a jig fixing portion at a central portion of both ends of the long side.
  3. 該振動板の背部が、振動装置と駆動棒により直結した構造を有する請求項1または2に記載のスピーカ装置。  The speaker device according to claim 1, wherein a back portion of the diaphragm has a structure in which the vibration device and the driving rod are directly connected.
  4. 振動装置が電磁ドライバ又は圧電素子であることを特徴とする請求項3に記載のスピーカ装置。  The speaker device according to claim 3, wherein the vibration device is an electromagnetic driver or a piezoelectric element.
  5. 振動板の板材が神代杉、杉、檜のいずれかであることを特徴とする請求項1〜4いずれかに記載のスピーカ装置。  The speaker device according to any one of claims 1 to 4, wherein a plate material of the diaphragm is any one of Kamishiro cedar, cedar and cocoon.
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