JPH1013983A - Acoustic lens unit - Google Patents
Acoustic lens unitInfo
- Publication number
- JPH1013983A JPH1013983A JP8165672A JP16567296A JPH1013983A JP H1013983 A JPH1013983 A JP H1013983A JP 8165672 A JP8165672 A JP 8165672A JP 16567296 A JP16567296 A JP 16567296A JP H1013983 A JPH1013983 A JP H1013983A
- Authority
- JP
- Japan
- Prior art keywords
- acoustic lens
- speaker
- lens unit
- lens device
- cloth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は各種音響機器に使用
されるスピーカの指向性を改善し、屋外での使用を可能
とする防水性のある音響レンズ装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof acoustic lens device which improves the directivity of a speaker used for various kinds of audio equipment and which can be used outdoors.
【０００２】[0002]
【従来の技術】従来、この種のスピーカにおいては、指
向性の鋭い周波数帯域では間接音成分が不足して音質を
損ない、また聴取位置によっても音質が大きく変化す
る。2. Description of the Related Art Conventionally, in this type of loudspeaker, indirect frequency components are insufficient in a frequency band having a sharp directivity to impair the sound quality, and the sound quality greatly changes depending on a listening position.
【０００３】図３は、従来の音響レンズ装置の断面図で
あり、同図によると、小孔６を穿孔した複数枚の中心孔
径の異なる円板状透孔板７をスピーカ３の前面に取り付
けた固定枠８の内辺に弾性体９を介してスピーカ開口側
から順次中心孔径が大きくなるように多層に配置して構
成していた。このような従来技術においては中心部ほど
音導が短くなるように形成し、板間が形成する音導の長
さ分だけ音の伝搬が遅れるのを利用して等位相の波面を
円弧状になるようにすることにより指向性を広げるもの
であった。FIG. 3 is a cross-sectional view of a conventional acoustic lens device. According to FIG. 3, a plurality of disc-shaped through-hole plates 7 each having a small hole 6 and having a different center hole diameter are attached to the front of the speaker 3. The fixed frame 8 is arranged in multiple layers on the inner side of the fixed frame 8 via an elastic body 9 so that the center hole diameter increases sequentially from the speaker opening side. In such prior art, the sound guide is formed so as to be shorter toward the center, and the wavefront having the same phase is formed into an arc shape using the delay of sound propagation by the length of the sound guide formed between the plates. By doing so, the directivity was expanded.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら上記の従
来の構成では、位相分布の制御は行えるものの音圧の強
度分布はほとんどかわらないため、拡散効果が少なくさ
らに部品点数が多く組み立てやすさやコストの面で不利
であるという課題を有していた。また、多孔質の孔から
雨水が直接スピーカ３のコーン紙に当たるため屋外での
使用は不可能であった。However, in the above-mentioned conventional structure, the phase distribution can be controlled, but the intensity distribution of the sound pressure hardly changes, so that the diffusion effect is small, the number of parts is large, and the ease of assembly and cost are low. Had the problem of being disadvantageous. Further, since rainwater directly hits the cone paper of the speaker 3 from the porous hole, it cannot be used outdoors.
【０００５】本発明はこのような従来の課題を解決する
ものであり、拡散効果が大きくしかも、安価に手軽にス
ピーカに取り付けられるという音響性能、量産性等に優
れ、さらに屋外での使用を可能とした音響レンズ装置を
提供することを目的とするものである。The present invention solves the above-mentioned conventional problems, has a large diffusion effect, and is excellent in acoustic performance and mass productivity such that it can be easily attached to a speaker at low cost, and can be used outdoors. It is an object of the present invention to provide an acoustic lens device as described above.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
に本発明の音響レンズ装置は、スピーカの円錐形状のコ
ーン紙の前面に、ナイロンやポリエステル等の合成繊維
の表面に多孔質フッ素系樹脂フィルムを張り付けた積層
多孔質フィルムからなる布を中央部を丸形状に穿孔し、
中央部の穿孔面積の小さい順に積層したものである。In order to solve the above-mentioned problems, an acoustic lens device according to the present invention comprises a speaker made of a porous fluorocarbon resin and a synthetic fiber such as nylon or polyester on the front surface of a cone-shaped cone paper. Perforate the center of the cloth made of the laminated porous film with the film attached in a round shape,
The layers are stacked in ascending order of the perforated area at the center.
【０００７】この構成によって、コーン紙を１次音源と
した時、音響レンズ装置の中央部が２次音源となり音源
の実効面積を小さくし、音源の強度分布制御も簡単に行
うと同時に指向性を広く拡散できる。また、この開口部
の中心より外側に向かい多孔質層が層密となるため中心
部の位相をその外側より進めることができる位相制御を
行うことにより球面波となり、さらに指向性を広げるこ
とができるものである。また多孔質フッ素系樹脂フィル
ムは、空気の透過は可能であるが、水滴の直径より孔径
が小さいためまた毛細管現象が起きないため水滴の流入
はない。したがってコーン紙全体に雨水がかからないた
め防水性が増し屋外での使用を可能とするものである。With this configuration, when cone paper is used as the primary sound source, the central part of the acoustic lens device becomes the secondary sound source, the effective area of the sound source is reduced, the intensity distribution of the sound source is easily controlled, and the directivity is improved. Can spread widely. In addition, since the porous layer facing the outside of the center of the opening becomes denser, the phase of the center part can be advanced from the outside so that a spherical wave is obtained by performing phase control, and the directivity can be further expanded. Things. The porous fluororesin film allows air to permeate, but does not allow water droplets to flow because the pore diameter is smaller than the diameter of the water droplets and no capillary phenomenon occurs. Therefore, since the rainwater does not cover the entire cone paper, the waterproofness is increased, and the cone paper can be used outdoors.
【０００８】[0008]
【発明の実施の形態】本発明の請求項１記載の発明は、
スピーカの円錐形状のコーン紙の前面に、ナイロンやポ
リエステル等の合成繊維の表面に多孔質フッ素系樹脂フ
ィルムを張り付けた布を中央部を丸形状に穿孔し、この
中央部の穿孔面積の小さい順に積層して取り付けたもの
であり、音響レンズ装置の中央部が２次音源となり、音
源の実効面積を小さくして、音源の強度分布制御を行う
とともに指向性を広く拡散できるものである。また、多
孔質フッ素系樹脂フィルムの使用によって雨水の浸入を
防止して防水性を向上し、屋外での使用を可能とするも
のである。BEST MODE FOR CARRYING OUT THE INVENTION
On the front of the speaker cone-shaped cone paper, perforate a cloth in which a porous fluororesin film is adhered to the surface of synthetic fiber such as nylon or polyester at the center in a round shape, and in the order of small perforation area at the center. The acoustic lens device is mounted in a stacked manner, and the central portion of the acoustic lens device serves as a secondary sound source. The effective area of the sound source can be reduced, the intensity distribution of the sound source can be controlled, and the directivity can be widely diffused. In addition, the use of a porous fluororesin film prevents rainwater from entering and improves waterproofness, thereby enabling use outdoors.
【０００９】請求項２に記載の発明は、中央部分を穿孔
した布の多孔質フッ素系樹脂フィルムを張り付けた反対
の面に熱再活性接着剤を塗布して積層し、熱プレスにて
一体構造にしたものであり、一体構造を極めて容易に形
成できるものである。According to a second aspect of the present invention, a heat-reactive adhesive is applied and laminated on the opposite surface of the cloth having a perforated central portion to which the porous fluororesin film is attached, and is integrally formed by hot pressing. The integrated structure can be formed very easily.
【００１０】以下、本発明の一実施の形態を図１（ａ）
〜図２（ｃ）により説明する。図１（ａ）は音響レンズ
装置の要部である積層多孔質フィルムからなる布の分解
斜視図であり、図１（ｂ）は音響レンズ装置の分解斜視
図であり、図２（ａ）〜（ｃ）は出力音圧周波数特性図
である。Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. FIG. 1A is an exploded perspective view of a cloth made of a laminated porous film, which is a main part of the acoustic lens device, and FIG. 1B is an exploded perspective view of the acoustic lens device, and FIGS. (C) is an output sound pressure frequency characteristic diagram.
【００１１】積層多孔質フィルムからなる布５は、図１
（ａ）のごとくナイロンやポリエステル等の合成繊維１
の表面に多孔質フッ素系樹脂フィルム２を張り付けて剛
性を維持して形成されている。また、合成繊維１の多孔
質フッ素系樹脂フィルム２を張り付けた反対面には熱再
活性接着剤を塗布している。The cloth 5 made of a laminated porous film is shown in FIG.
As shown in (a), synthetic fiber 1 such as nylon or polyester
A porous fluororesin film 2 is adhered to the surface of the substrate to maintain rigidity. Further, a heat-reactive adhesive is applied to the opposite surface of the synthetic fiber 1 on which the porous fluororesin film 2 is adhered.
【００１２】５ａ〜５ｅはこの積層多孔質フィルムから
なる布５の中心部の穿孔面積の異なるものであり、小さ
い順に積層される。Reference numerals 5a to 5e denote holes having different perforation areas at the center of the cloth 5 made of the laminated porous film, and are laminated in ascending order.
【００１３】積層にあたっては、スピーカ３の円錐形状
のコーン紙４の前面に積層し、熱プレスによって極めて
容易に一体化して音響レンズを形成するものである。In the lamination, the acoustic lens is formed by laminating on the front surface of the cone-shaped cone paper 4 of the speaker 3 and extremely easily integrating them by hot pressing.
【００１４】上記構成とすることにより音源の位相分布
制御、すなわち中心部の位相をその外側より進められ、
また音圧の強度分布の制御、すなわち中心部の強度をそ
の外側より高めることを効率よく行うことができる。ま
た多孔質フッ素系樹脂フィルム２は、空気の透過は可能
であるが水滴の直径より孔径が小さいため、また毛細管
現象が起きないため水滴の流入はない。したがってコー
ン紙全体に雨水がかからないため防水性が増し屋外での
使用を可能とするものである。With the above configuration, the phase distribution of the sound source can be controlled, that is, the phase at the center can be advanced from the outside.
Further, it is possible to efficiently control the intensity distribution of the sound pressure, that is, to increase the intensity of the central portion from the outside thereof. The porous fluorine-based resin film 2 allows air to permeate, but has a smaller hole diameter than the diameter of a water droplet, and does not cause a capillary phenomenon. Therefore, since the rainwater does not cover the entire cone paper, the waterproofness is increased, and the cone paper can be used outdoors.
【００１５】図２は、従来技術との比較を示すスピーカ
の出力音圧周波数特性図であり、図２（ａ）は、音響レ
ンズ装置を用いないもの、図２（ｂ）は、従来の音響レ
ンズ装置を用いたもの、図２（ｃ）は本実施の形態の音
響レンズ装置を用いたものを示し、各図中０°，３０
°，４５°は指向性を表わし、測定点が音響レンズ装置
の中心軸に対し、０°，３０°，４５°であることを示
している。FIGS. 2A and 2B are graphs showing the output sound pressure frequency characteristics of a loudspeaker showing a comparison with the prior art. FIG. 2A shows a case where no acoustic lens device is used, and FIG. FIG. 2C shows a lens using the lens device, and FIG. 2C shows a lens using the acoustic lens device of the present embodiment.
° and 45 ° represent directivity, and indicate that the measurement points are 0 °, 30 °, and 45 ° with respect to the center axis of the acoustic lens device.
【００１６】以上の図２（ａ），（ｂ），（ｃ）から明
らかなように本実施の形態の音響レンズ装置において
は、１０ＫＨｚ（特に２ＫＨｚ〜１０ＫＨｚ）までの周
波数での各測定点における出力音圧レベルのばらつきが
小さく、安定していることが確認された。As apparent from FIGS. 2A, 2B and 2C, in the acoustic lens device according to the present embodiment, the frequency at each measurement point at 10 KHz (particularly 2 KHz to 10 KHz) is measured. It was confirmed that the variation in the output sound pressure level was small and stable.
【００１７】[0017]
【発明の効果】本発明は以上のように、スピーカの円錐
形状のコーン紙の前面にナイロンやポリエステル等の合
成繊維の表面に多孔質フッ素系樹脂フィルムを張り付け
た布を中央部を丸形状に穿孔し、中央部の穿孔面積の小
さい順に積層して音響レンズ装置を簡単に装着すること
により安価に、音源の強度分布制御及び位相制御が行え
効率良くスピーカの指向性を拡散することができるとと
もに、また多孔質フッ素系樹脂フィルムは、空気の透過
は可能であるが水滴の直径より孔径が小さいため、また
毛細管現象が起きないため水滴の流入がなく、コーン紙
全体に雨水がかからないため防水性が増し、屋外での使
用を可能とするものである。As described above, according to the present invention, a cloth in which a porous fluororesin film is adhered to the surface of a synthetic fiber such as nylon or polyester on the front surface of a cone-shaped cone paper of a speaker is formed into a circular shape at the center. By perforating and stacking the acoustic lens device in the order of small perforation area in the center, the sound source intensity distribution control and phase control can be performed at low cost, and the directivity of the speaker can be efficiently diffused. In addition, the porous fluororesin film allows air to permeate, but the pore size is smaller than the diameter of water droplets, and there is no inflow of water droplets because there is no capillary phenomenon, and the entire cone paper is not exposed to rainwater, so it is waterproof. , And can be used outdoors.
【図１】（ａ）本発明の一実施の形態の音響レンズ装置
の要部である積層多孔質フィルムからなる布の分解斜視
図 （ｂ）同音響レンズ装置の分解斜視図FIG. 1A is an exploded perspective view of a cloth made of a laminated porous film which is a main part of an acoustic lens device according to an embodiment of the present invention. FIG. 1B is an exploded perspective view of the acoustic lens device.
【図２】（ａ）コーン形フルレンジスピーカ単独の場合
の出力音圧周波数特性図 （ｂ）従来の音響レンズ装置をつけたスピーカの出力音
圧周波数特性図 （ｃ）本発明の一実施形態の音響レンズ装置をつけたス
ピーカの出力音圧周波数特性図FIG. 2A is a diagram showing an output sound pressure frequency characteristic when a cone type full-range speaker is used alone. FIG. 2B is a diagram showing an output sound pressure frequency characteristic of a speaker provided with a conventional acoustic lens device. FIG. 2C is an embodiment of the present invention. Output sound pressure frequency characteristic diagram of speaker with acoustic lens device
【図３】従来の音響レンズ装置の断面図FIG. 3 is a cross-sectional view of a conventional acoustic lens device.
１ 合成繊維 ２ 多孔質フッ素系樹脂フィルム ３ スピーカ ４ コーン紙 ５，５ａ〜５ｅ（積層多孔質フィルムからなる）布 DESCRIPTION OF SYMBOLS 1 Synthetic fiber 2 Porous fluororesin film 3 Speaker 4 Cone paper 5,5a-5e (comprising a laminated porous film) cloth
Claims (2)
に、ナイロンやポリエステル等の合成繊維の表面に多孔
質フッ素系樹脂フィルムを張り付けた布を中央部を丸形
状に穿孔し、この中央部の穿孔面積の小さい順に積層し
て取り付けた音響レンズ装置。1. A speaker in which a porous fluororesin film is adhered to the surface of a synthetic fiber such as nylon or polyester on a front surface of a cone-shaped cone paper of a speaker, a center portion of which is pierced into a circular shape at a center portion thereof. An acoustic lens device that is stacked and mounted in ascending order of hole area.
樹脂フィルムを張り付けた反対の面に熱再活性接着剤を
塗布して積層し熱プレスにて一体構造にした請求項１記
載の音響レンズ装置。2. The sound according to claim 1, wherein a heat-reactive adhesive is applied to the opposite surface of the cloth having a perforated central portion to which the porous fluororesin film is attached, laminated, and integrated by a hot press. Lens device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8165672A JPH1013983A (en) | 1996-06-26 | 1996-06-26 | Acoustic lens unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8165672A JPH1013983A (en) | 1996-06-26 | 1996-06-26 | Acoustic lens unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1013983A true JPH1013983A (en) | 1998-01-16 |
Family
ID=15816842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8165672A Pending JPH1013983A (en) | 1996-06-26 | 1996-06-26 | Acoustic lens unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1013983A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4883735B1 (en) * | 2011-07-13 | 2012-02-22 | 儀夫 西岡 | Method for manufacturing diffuser for speaker system |
| ITVR20130147A1 (en) * | 2013-06-19 | 2014-12-20 | Angelo Camesasca | ACOUSTIC LENS |
| CN104505088A (en) * | 2015-01-08 | 2015-04-08 | 江苏大学 | Acoustic wave focusing device based on intrinsic displacement mode |
-
1996
- 1996-06-26 JP JP8165672A patent/JPH1013983A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4883735B1 (en) * | 2011-07-13 | 2012-02-22 | 儀夫 西岡 | Method for manufacturing diffuser for speaker system |
| ITVR20130147A1 (en) * | 2013-06-19 | 2014-12-20 | Angelo Camesasca | ACOUSTIC LENS |
| EP2838083A3 (en) * | 2013-06-19 | 2015-02-25 | Angelo Camesasca | Acoustic lens and acoustic diffuser comprising said acoustic lens |
| CN104505088A (en) * | 2015-01-08 | 2015-04-08 | 江苏大学 | Acoustic wave focusing device based on intrinsic displacement mode |
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