JPS6210998A - Plane-typed speaker - Google Patents

Abstract

PURPOSE:To increase a voice output by fixing a resonance disc made of hard synthetic resin foam on both side of a film piezoelectric element. CONSTITUTION:Resonance discs 3 made of the hard synthetic resin foam are fixed with being sticked or contacted with pressure on both side of a film piezoelectric element 2. For the resonance disc 3, hard resin foam resin, for example, polystyrene resin foam, hard urethane resin foam, urea resin foam or phenol resin foam and the like can be used and with using highly foamed material, mass is decreased and the transmission characteristic of voice is improved. With inputting a sound signal between the electrode films 6a and 6b of the film piezoelectric element 2, resonance is occurred between both resonance discs 3 and the voice is outputted from the surfaces of the resonance, discs 3 and the resonance discs 3 are resonated in thickness direction and the level of output sound pressure is improved. Thereby, the voice output can be increased.

Description

【発明の詳細な説明】 ［産業上の利用分野〕 本発明は壁等に掛けたり、絵画、ポスター、装飾板等の
裏面に設置することができる平面型スピーカーに係り、
特に圧電膜を使用した薄型で平板構造の平面型スピーカ
ーに関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a flat speaker that can be hung on a wall or installed on the back of a painting, poster, decorative board, etc.
In particular, the present invention relates to a flat speaker with a thin flat structure using a piezoelectric film.

〔従来の技術〕[Conventional technology]

従来の圧電膜を用いたスピーカーは、例えば第４図示の
ように圧電膜４の両面にそれぞれ電極膜６．７を設けて
なる膜状圧電素子２を、湾曲した基材８の外曲面に接着
して構成したものである。In a conventional speaker using a piezoelectric film, for example, as shown in FIG. It was constructed as follows.

この従来のスピーカーは膜状圧電素子２の電極膜６．７
間に音声信号を入力して当該基板８の内曲面を前面とし
て音声を出力するものである。This conventional speaker has an electrode film 6.7 of a film piezoelectric element 2.
An audio signal is input between them and the audio is output using the inner curved surface of the board 8 as the front surface.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかしながら上記スピーカーは平板構造にすると、出力
音圧レベルが極端に低下し、音声出力が小さ過ぎて（殆
ど音声が出ない）実用に供し得ない。そのため湾曲構造
にする必要があるので、設置場所、取付方法に制約を受
け、壁等に掛けたり、絵画、ポスター、装飾板等の裏面
に設置するのに適さないという問題点がある。また、前
面に模様付けしてポスター等に使用する場合、模様が歪
み美観を損するという問題点もある。However, if the above-mentioned speaker has a flat plate structure, the output sound pressure level will be extremely low, and the sound output will be too small (almost no sound will be produced), making it impossible to put it to practical use. Therefore, since it is necessary to have a curved structure, there are restrictions on the installation location and mounting method, and there is a problem that it is not suitable for hanging on a wall or installing on the back of a painting, poster, decorative board, etc. In addition, when the front surface is patterned and used for posters, etc., there is a problem that the pattern is distorted and spoils the aesthetic appearance.

〔発明の概要〕[Summary of the invention]

本発明スピーカーは上記問題点を解決するため第１図示
のように膜状圧電素子２の両面に硬質の合成樹脂発泡体
よりなる共鳴板３を添着してなる構成としたものである
。In order to solve the above-mentioned problems, the speaker of the present invention has a structure in which resonance plates 3 made of hard synthetic resin foam are attached to both sides of a membrane piezoelectric element 2, as shown in the first figure.

このように膜状圧電素子２の両面に共鳴板３を添着する
ことにより、出力音圧レベルを向上させて音声出力を増
大させることができ、平板構造のスピーカーを実用化す
ることができる。By attaching the resonance plates 3 to both sides of the membrane piezoelectric element 2 in this way, the output sound pressure level can be improved and the audio output can be increased, and a speaker with a flat plate structure can be put into practical use.

〔発明の詳細な説明〕[Detailed description of the invention]

第１図は本発明スピーカーの一実施例を示す断面図であ
る。FIG. 1 is a sectional view showing an embodiment of the speaker of the present invention.

まず、その構成を説明する。First, its configuration will be explained.

第１図において、２は圧電膜４の両面にそれぞれ電極膜
（蒸着）　６ａ　、　６ｂを形成してなる膜状圧電素子
である。膜状圧電素子２としては通常、圧電膜一枚で構
成される単層形であるが、電歪効果を向上させる為には
積層型を使用しても良い。In FIG. 1, reference numeral 2 denotes a film-like piezoelectric element formed by forming electrode films (deposited) 6a and 6b on both sides of a piezoelectric film 4, respectively. The film-like piezoelectric element 2 is usually a single-layer type composed of a single piezoelectric film, but a laminated type may be used to improve the electrostrictive effect.

圧電膜４としては、チタン酸・ジルコン酸鉛系。The piezoelectric film 4 is made of titanate/lead zirconate.

チタン酸鉛系、チタン酸バリウム系等の強誘電体からな
るセラミックス圧電膜、ポリ弗化ビニリデン、その共重
合体、ポリシアン系ビニリデン共重合体等の高分子圧電
膜、ポリ弗化ビニリデンもしくはその共重合体、ポリア
セタール樹脂、ナイロン樹脂等の高分子、エポキシ樹脂
等の前記強誘電体との複合化物からなる高分子複合圧電
膜などを用いることができ、特に高分子系のものが好ま
しい。Ceramic piezoelectric films made of ferroelectric materials such as lead titanate and barium titanate, polymer piezoelectric films such as polyvinylidene fluoride and its copolymers, polycyanic vinylidene copolymers, and polyvinylidene fluoride or its copolymers. Polymer composite piezoelectric films made of polymers, polymers such as polyacetal resins, nylon resins, and composites with the ferroelectric materials such as epoxy resins can be used, and polymer-based ones are particularly preferred.

３は硬質の合成樹脂発泡体よりなる共鳴板で、膜状圧電
素子２の両面に接着あるいは圧接することにより添着さ
れている。Reference numeral 3 denotes a sounding plate made of a hard synthetic resin foam, which is attached to both surfaces of the membrane piezoelectric element 2 by adhesion or pressure contact.

共鳴板３としては発泡ポリスチレン樹脂、発泡硬質ウレ
タン樹脂、発泡ウレア樹脂、発泡フェノール樹脂等硬質
の発泡樹脂を用いることができる。As the sounding plate 3, hard foamed resin such as foamed polystyrene resin, foamed hard urethane resin, foamed urea resin, and foamed phenol resin can be used.

独立気泡性の発泡体成形品（第１図参照）や発泡体ブロ
ックを熱線でカットしたもの（第２図参照）は表面にス
キン層を有するので、音声をスキン層表面で反射し定在
波を形成する上で好ましく、特に表面が平滑面となる第
１図示の成形品が好ましい。Closed-cell foam molded products (see Figure 1) and foam blocks cut with hot wire (see Figure 2) have a skin layer on the surface, so sound is reflected on the surface of the skin layer and creates a standing wave. Particularly preferred is the molded product shown in the first figure, which has a smooth surface.

またスキンを有しない連続気泡体あるいは機械的にスラ
イスした発泡体を用いるときは、第３図示のように上下
面に肉薄のポリスチレン、アクリル、ポリカーボネート
等の硬質プラスチック、金属板等肉薄の反射板９を設け
る。In addition, when using open-cell foam or mechanically sliced foam without a skin, thin reflective plates 9 such as thin hard plastics such as polystyrene, acrylic, or polycarbonate, or metal plates are used on the upper and lower surfaces as shown in the third figure. will be established.

共鳴板３として高発泡材料を用いるときは質量が小さく
なり、音声の透過性がよく望ましい。When a highly foamed material is used as the sounding plate 3, the mass is small and sound transparency is desirable.

共鳴板３の厚さｌは、音声周波数をｆ、　、　２／λの
整数倍数をｎ、ヤング率をＥ２発泡体嵩密度をρ。、ポ
アソン比をσとすると、 より計算することができるが、音声の場合、５００■２
〜３０００Ｈｚの範囲から選択した周波数（一般に１０
００■２）で計算した値である。The thickness l of the sounding plate 3 is the audio frequency f, the integer multiple of 2/λ is n, the Young's modulus is E2, the foam bulk density is ρ. , if Poisson's ratio is σ, it can be calculated as follows, but in the case of speech, it is 500■2
Frequency selected from the range ~3000Hz (generally 10
This is the value calculated in 00■2).

次にその作用を説明する。Next, its effect will be explained.

膜状圧電素子２の電極膜６ａ　、　６ｂ間に音声信号を
入力すると、両共鳴板３間で共鳴し、共鳴板３の表面よ
り音声を出力することができる。この場合、共鳴板３は
厚さ方向に共振し出力音圧レベルが向上し、音声出力を
増大させることになる。When an audio signal is input between the electrode films 6a and 6b of the membrane piezoelectric element 2, it resonates between both sounding plates 3, and sound can be output from the surface of the sounding board 3. In this case, the sounding plate 3 resonates in the thickness direction, thereby improving the output sound pressure level and increasing the audio output.

上述のように本発明によれば、膜状圧電素子２の両面に
硬質の合成樹脂発泡体よりなる共鳴板３を添着すること
によりこの共鳴板３を共振させて出力音圧レベルを向上
させることができるから、音声出力の増大を図り平板構
造の平面型スピーカーを実用化することができる。その
ため設置場所、取付方法に制約を受けず、容易に取付け
ることができるので、壁等に掛けたり、絵画、ホスター
。As described above, according to the present invention, by attaching the sounding plates 3 made of hard synthetic resin foam to both sides of the membrane piezoelectric element 2, the sounding plates 3 are caused to resonate, thereby improving the output sound pressure level. Therefore, it is possible to increase the audio output and put a planar speaker with a planar structure into practical use. Therefore, there are no restrictions on the installation location or installation method, and it can be easily installed, so it can be hung on a wall, used as a painting, or as a hoster.

装飾板等の裏面に設けるのに好適である。また前面に模
様付けしてポスター等に使用する場合、模様が歪み美観
を損うこともない。It is suitable for providing on the back side of a decorative board, etc. Furthermore, when the front surface is patterned and used for posters, etc., the pattern will not be distorted and the appearance will not be spoiled.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明スピーカーの一実施例を示す断面図、第
２図及び第３図は本発明における共鳴板の他の例を示す
断面図、第４図は従来スピーカーの一例を示す斜視図で
ある。 ２・・・・・・膜状圧電素子、３・・・・・・共鳴板、
４・・・・・・圧電膜、６ａ　、　６ｂ・・・・・・電
極膜。 浮ｌ目 箕嚇」反 肚・妨噂、系テ 算２０ 笹３しFIG. 1 is a sectional view showing an embodiment of the speaker of the present invention, FIGS. 2 and 3 are sectional views showing other examples of the sounding plate of the invention, and FIG. 4 is a perspective view showing an example of a conventional speaker. It is. 2...Membrane piezoelectric element, 3...Resonance plate,
4... Piezoelectric film, 6a, 6b... Electrode film. Rumors of anger and nuisance, system score: 20, Sasa: 3

Claims (1)

【特許請求の範囲】[Claims] 膜状圧電素子の両面に硬質の合成樹脂発泡体よりなる共
鳴板を添着してなる平面型スピーカー。A flat speaker consisting of a sounding plate made of hard synthetic resin foam attached to both sides of a membrane piezoelectric element.