JP2008286945A

JP2008286945A - Sound source device

Info

Publication number: JP2008286945A
Application number: JP2007130826A
Authority: JP
Inventors: Hiroharu Yamato; 弘治大和; Kiwamu Shibata; 究柴田; Hirohisa Okuno; 裕寿奥野; Yoshitake Shimada; 佳武島田
Original assignee: Panasonic Electric Works Co Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 2007-05-16
Filing date: 2007-05-16
Publication date: 2008-11-27

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound source device capable of suppressing degradation in sound pressure. <P>SOLUTION: The sound source device comprises a vibration block 1 for generating sound through vibrating; a case 2, in which the vibration block 1 is accommodated so that a sound hole 21 for passing the sound generated by the vibration block 1 is passed through from the inside to the outside; and a cover 3 connected to the case 2 which covers at least a part where the sound hole 21 is provided on an outer face of the case 2 with a gap 30 between them. A sound hole 31, which opens to the gap 30 and to the outside, is passed through in a cover 3, and a waterproof sheet 4 for blocking passing of water by closing the sound hole 31 of the cover 3 is stuck and fixed. The sound hole 31 of the cover 3 is larger than the sound hole 21 of the case 2, and a gap is provided between the waterproof sheet 4 and the outer face of the case 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、音源装置に関するものである。 The present invention relates to a sound source device.

従来から、音源装置として、音穴が内外に貫設されたケースに音源を収納したものが提供されている。 2. Description of the Related Art Conventionally, a sound source device in which a sound source is stored in a case having a sound hole penetrating inside and outside has been provided.

この種の音源装置において、音穴から水が浸入すると、共振周波数の変動による音圧の低下が発生し、また故障の原因ともなり得るため、従来は、防水性を確保するために、音穴を閉塞する防水シートをケースの内面に固着していた（例えば、特許文献１参照）。
特開平６−８６３９６号公報 In this type of sound source device, if water enters from the sound hole, a decrease in sound pressure due to fluctuations in the resonance frequency may occur, and it may also cause a failure. Conventionally, in order to ensure waterproofness, The waterproof sheet which closes up was fixed to the inner surface of the case (for example, refer patent document 1).
JP-A-6-86396

しかし、上記従来構成では、音穴と防水シートとで構成される凹部内に溜まった水による音圧の低下が発生しやすかった。 However, in the above-described conventional configuration, the sound pressure is likely to decrease due to the water accumulated in the recess formed by the sound hole and the waterproof sheet.

本発明は、上記事由に鑑みて為されたものであり、その目的は、音圧の低下が抑制される音源装置を提供することにある。 The present invention has been made in view of the above reasons, and an object thereof is to provide a sound source device in which a decrease in sound pressure is suppressed.

本発明は、音源と、音源の音を通す音穴が内外に貫設されて音源を収納したケースと、ケースに結合し、ケースの外面において少なくとも音穴が設けられた部位を間に隙間を空けて覆うカバーとを備え、カバーには、前記隙間の内外にそれぞれ開口した音穴が貫設され、カバーにおいてケースに対向する面には、カバーの音穴を閉塞して水の通過を阻止する防水シートが固着されていて、カバーの音穴はケースの音穴よりも大きく、且つ、防水シートとケースの外面との間には隙間が設けられていることを特徴とする。 The present invention provides a gap between a sound source and a case in which a sound hole through which the sound of the sound source is passed penetrates inside and outside and accommodates the sound source, and a portion that is coupled to the case and at least the sound hole is provided on the outer surface of the case. The cover is provided with a cover to be opened, and sound holes that are opened inside and outside of the gap are provided in the cover, and the surface of the cover that faces the case is closed to prevent the passage of water. The waterproof sheet is fixed, the sound hole of the cover is larger than the sound hole of the case, and a gap is provided between the waterproof sheet and the outer surface of the case.

本発明によれば、カバーや防水シートを設けない場合に比べて防水性が向上する。また、カバーの音穴はケースの音穴よりも大きく、防水シートとケースの外面との間に隙間が設けられているので、防水シートをケースの内面に固着してカバーを設けない場合や、防水シートがケースの外面に密着する場合に比べ、音穴と防水シートとによって構成される凹部内の水滴による音圧の低下が抑制される。 According to the present invention, the waterproof property is improved as compared with the case where no cover or waterproof sheet is provided. Also, the sound hole of the cover is larger than the sound hole of the case, and there is a gap between the waterproof sheet and the outer surface of the case, so when the waterproof sheet is fixed to the inner surface of the case and the cover is not provided, Compared with the case where the waterproof sheet is in close contact with the outer surface of the case, a decrease in sound pressure due to water droplets in the concave portion formed by the sound hole and the waterproof sheet is suppressed.

以下、本発明を実施するための最良の形態について、図面を参照しながら説明する。 The best mode for carrying out the present invention will be described below with reference to the drawings.

本実施形態は、図１に示すように、音源としての振動ブロック１と、振動ブロック１が発生させた音を通す音穴２１が内外に貫設されて振動ブロック１を収納したケース２と、ケース２に結合しケース２の外面において音穴２１が開口した部位（図１における上面）を間に隙間３０を空けて覆うカバー３とを備える。ケース２及びカバー３は、それぞれ例えばＡＢＳ（acrylonitrile butadiene styrene）樹脂やＰＣ（polycarbonate）樹脂などの合成樹脂からなる。 As shown in FIG. 1, the present embodiment includes a vibration block 1 as a sound source, a case 2 in which a sound hole 21 through which sound generated by the vibration block 1 passes is housed inside and outside, and the vibration block 1 is accommodated, A cover 3 is provided which covers the portion (the upper surface in FIG. 1) which is coupled to the case 2 and where the sound hole 21 is opened on the outer surface of the case 2 with a gap 30 therebetween. The case 2 and the cover 3 are made of a synthetic resin such as ABS (acrylonitrile butadiene styrene) resin or PC (polycarbonate) resin.

振動ブロック１は、例えば黄銅製の円板形状の振動板１１と、振動板１１の一面に固着された圧電素子１２とからなり、圧電素子１２に電圧が加えられることにより振動して音を発生させる周知の圧電ブザーである。 The vibration block 1 includes a disc-shaped vibration plate 11 made of, for example, brass, and a piezoelectric element 12 fixed to one surface of the vibration plate 11, and vibrates and generates sound when voltage is applied to the piezoelectric element 12. This is a known piezoelectric buzzer.

ケース２の内面には、外径が振動板１１よりも僅かに小さい円筒形状の支持部２２が内側へ突設されており、振動板１は、厚さ方向を支持部２２の軸方向に向けて、圧電素子１２が固着された面の反対面の周縁部を支持部２２の下端に固着されている。支持部２２に囲まれる空間の共振周波数と振動板１１の共振周波数とは揃えられており、音穴２１はケース２の内側（図１の下側）から見て支持部２２に囲まれる範囲の中心に位置している。 A cylindrical support portion 22 having an outer diameter slightly smaller than that of the diaphragm 11 is projected inwardly on the inner surface of the case 2, and the diaphragm 1 has a thickness direction in an axial direction of the support portion 22. Thus, the periphery of the surface opposite to the surface to which the piezoelectric element 12 is fixed is fixed to the lower end of the support portion 22. The resonance frequency of the space surrounded by the support portion 22 and the resonance frequency of the diaphragm 11 are aligned, and the sound hole 21 is in a range surrounded by the support portion 22 when viewed from the inside of the case 2 (lower side in FIG. 1). Located in the center.

カバー３において、ケース２の音穴２１の貫通方向（図１の上方向）から見てケース２の音穴２１に重なる部位を含む範囲には、ケース２との間の隙間の内外を連通させる音穴３１が貫設されている。つまり、カバー３の音穴３１はケース２の音穴２１よりも大きい。 In the cover 3, the inside and outside of the gap between the case 2 and the case 2 are communicated with a range including a portion overlapping the sound hole 21 of the case 2 when viewed from the penetration direction of the sound hole 21 of the case 2 (upward direction in FIG. 1). A sound hole 31 is provided therethrough. That is, the sound hole 31 of the cover 3 is larger than the sound hole 21 of the case 2.

さらに、カバー３の内面（図１での下面）には、カバー３の音穴３１を閉塞して水の浸入を防止する防水シート４が固着されている。防水シート４としては、例えばゴアテックス（登録商標）を用いることができる。また、固着の手段としては、例えば接着剤による接着を用いることができる。カバー３とケース２との間の隙間３０は、ケース２の外面と防水シート４との間に隙間が空く程度に大きくしてある。 Further, a waterproof sheet 4 that closes the sound hole 31 of the cover 3 and prevents water from entering is fixed to the inner surface of the cover 3 (lower surface in FIG. 1). For example, Gore-Tex (registered trademark) can be used as the waterproof sheet 4. Further, as a means for fixing, for example, adhesion by an adhesive can be used. The gap 30 between the cover 3 and the case 2 is large enough to leave a gap between the outer surface of the case 2 and the waterproof sheet 4.

ここで、図２に示すように防水シート４がケース２の外面に密着する場合、外側（図２での上側）から見てケース２の音穴２１に重なる位置に水滴Ｄが生じた場合、水滴Ｄによる音圧の低下が著しい。これに対し、本実施形態では、防水シート４とケース２の外面との間に隙間が空いており、且つ、カバー３の音穴３１はケース２の音穴２１よりも大きいので、図３に矢印Ａで示すように、音が水滴Ｄを避けて伝播する経路が存在することにより、音圧の低下が抑制される。 Here, when the waterproof sheet 4 is in close contact with the outer surface of the case 2 as shown in FIG. 2, when a water droplet D is generated at a position overlapping the sound hole 21 of the case 2 when viewed from the outside (upper side in FIG. 2), The sound pressure drop due to water droplets D is remarkable. On the other hand, in the present embodiment, there is a gap between the waterproof sheet 4 and the outer surface of the case 2 and the sound hole 31 of the cover 3 is larger than the sound hole 21 of the case 2. As indicated by the arrow A, the presence of a path through which the sound propagates away from the water droplets D suppresses a decrease in sound pressure.

また、従来例のようにカバー３を設けず防水シート４をケース２の内面に固着してケース２の音穴２１を閉塞する場合に比べ、カバー３の音穴３１がケース２の音穴２１よりも大きいことにより、防水シート４と音穴２１，３１とで構成される凹部の全体に水が行き渡りにくくなるから、音圧の低下が発生しにくい。 Further, as compared to the case where the cover 3 is not provided and the waterproof sheet 4 is fixed to the inner surface of the case 2 and the sound hole 21 of the case 2 is closed as in the conventional example, the sound hole 31 of the cover 3 is the sound hole 21 of the case 2. Since it becomes difficult for water to spread over the whole recessed part comprised by the waterproof sheet 4 and the sound holes 21 and 31, it is hard to generate | occur | produce the fall of a sound pressure.

本発明の実施形態の要部を示す断面図である。It is sectional drawing which shows the principal part of embodiment of this invention. 同上の比較例を示す断面図である。It is sectional drawing which shows the comparative example same as the above. 同上の効果を示す説明図である。It is explanatory drawing which shows an effect same as the above.

Explanation of symbols

１振動ブロック
２ケース
３カバー
４防水シート
２１，３１音穴
３０隙間 DESCRIPTION OF SYMBOLS 1 Vibration block 2 Case 3 Cover 4 Waterproof sheet 21,31 Sound hole 30 Clearance

Claims

Sound source,
A case that houses the sound source with sound holes that pass through the sound source inside and outside,
A cover that is coupled to the case and covers at least a portion provided with a sound hole on the outer surface of the case with a gap therebetween;
The cover has sound holes opened inside and outside the gap, and a waterproof sheet that blocks the sound holes of the cover and prevents the passage of water is fixed to the surface of the cover that faces the case. ,
A sound source device, wherein the sound hole of the cover is larger than the sound hole of the case, and a gap is provided between the waterproof sheet and the outer surface of the case.