JPS588000A - Piezoelectric speaker - Google Patents

Abstract

PURPOSE:To obtain a thin speaker where a flat frequency characteristic is obtained and the low band characteristic is improved, by attaching a piezoelectric diaphragm, which oscillates in the bending oscillation mode, to a diaphragm stretched over a frame through an elastic material in the peripheral part. CONSTITUTION:A diaphragm 5 consisting of a polyethylene resin film or a metallic foil is stretched on one face of a ring-shaped frame 4 while tension is applied to the diaphragm 5. A disc-shaped piezoeletric diaphragm 6 where a piezoelectric porcelain plat 6b is stuck to a metallic plate 6a oscillates in the bending oscillation mode. The outside diameter of a ring-shaped elastic material 7 consisting of a foamed resin or the like is made equal to that of the diaphragm 6 approximately, and the elastic material 7 is fixed to the face of the diaphragm 5 in the side of the frame 4 on a circle having the same axis as the frame 4, and the diaphragm 6 is fixed onto the elastic material 7 concentrically approximately. An elastic material 8 consists of rubbe or foamed resin is attached to the center of one face of the diaphragm 6. Thus, the resonance peak is restrained to obtain a flat frequency characteristic, and a thin speaker having the low band characteristic improved is obtained.

Description

[Detailed Description of the Invention] Akira Kiba has developed a new F plate-shaped) ftL as a speaker! I will clarify.

Recently, there has been a strong push to make electronic equipment equipped with speakers, such as radios and voice synthesizers, thinner (lr-).

However, it is difficult to make the electrodynamic speaker thinner, so this ff! i! This is a major obstacle to making child devices thinner. Therefore, a piezoelectric speaker; <,,′−
This piezoelectric type is attracting attention, and one example of this piezoelectric type is v'-+
: Constructed as shown in Figure 1 and sent to CI Figure 1: Mackerel 1^
1, 1 is a diaphragm fixed to the frame 6, and a pressure diaphragm 2 is attached with adhesive to the center of this vibration P1. A characteristic resonance peak occurred, making it difficult to flatten the 5-frequency lifespan.In addition, from the perspective of current piezoelectric technology, it is difficult to reduce the resonance frequency of the piezoelectric element 1 to the low frequency range of the audio frequency range. Area 1jt
However, it was very difficult to improve the low-frequency characteristics of the piezoelectric speaker.

The present invention is based on F-, "C" in view of the conventional technical situation mentioned above.
This was done to reduce the co-coat beak characteristic of the piezoelectric effect as much as possible.
The flat same-wavenumber characteristic can be improved, and the low frequency range r and 〒l'lE can also be improved.

The purpose is to provide speakers.

The embodiments of the present invention will now be described in detail with reference to the drawings.

In Fig. 2, 1-1 is a frame constructed in a circular shape, for example, and on one side of the frame 4, a 414 #r film 5 made of polyethylene resin, control foil, etc. is coated for one length. Filled with power [stretched C10]. A piezoelectric ceramic plate 6b is pasted on the 6I mahjaku plate 6a (=J-shaped circular pressure plate, with a diaphragm.

The lead wire (F!:r shown) is connected to the specified location.
When a signal is applied to the lead net of f, the piezoelectric diaphragm 6 itself becomes 1 m
JIHrf with music swing f + I7 mode! ! +. 7ke rubber.

茫;'f' + p'lC composition such as fat, and annular elastic body, each of which has a diameter approximately equal to the diameter of the front plate of the FE regular shield /, /7'11). , bullet 1 cow i book 7 (d:
It is fixed almost concentrically with 1/-no, 4, and this elastic body 7σ)j- is 11. (approximately concentric) E1 photographing plate 6 is fixed 1t゛fi+
decrease. In the center of one side of this piezoelectric imaging plate 6, there are
"l"fj! +77, I'IN, etc. are attached to the elastic body 8, I'l, te1. Ru. The diaphragm 6 of the Wang Lei type speaker 1/:L, f5if, configured as shown below, bends and vibrates in a state ξ11 supported by the elastic body 7, and this vibration passes through the elastic body 7 to the 4-Yuichi 11 membrane. 5, this vibration 1tl15 also bends and moves in the surrounding state according to Freno 4 [sound waves are generated]. According to this example, 111i song 1 vibration of diaphragm 6 is 1
Limit 9ψ51 (r eight, and f7
] J return rib 11 φ5) bolt 2 J branch 1 no CJm song 1 vibration Δl is called ゛) υ this f lnm, so the resonance peak peculiar to the piezoelectric effect is pi'IC'l\ or flat What is the same wavenumber characteristic? I will be beaten. Ma1'j s prisoner/IJ missing 1
An elastic body 8 is placed on the central part of the amplitude of the Senden diaphragm O which is 1.
11 is suppressed and the low frequency side is extended, resulting in a low frequency of 71f.
I can improve my student life.

One to ii self': R1m f! 1 t"O" C1 piezoelectric 1fii rib IN 6! Well, instead of the metal plate 6pLθ), a curved plate may be used, and instead of the porcelain plate 6b, a piezoelectric thin film may be formed using a metal plate or an insulating plate. Pressure 11 g for 2 sheets of 1 plate, Bimol] 7 may be sufficient, in short, piezoelectric vibration of 1 rotation of bending vibration, 5 should be 1. Soil, elastic body 7 mm pressure Mt, vibration Interpose it between the same side of plate 6 and jl, ", heart trunk 5 (・": yo<, t's J cedar 1 large 11f 1,000 λ,!dechiru・

[Brief explanation of the drawing]

Figure 1! Location map of the ri-side pressure bar 1, 2nd
The figure shows an implementation of a piezoelectric type speaker f91J according to the present invention.
? , is a sectional view showing. 4...Frame, 5...Vibration IP, 6
... Piezoelectric diaphragm, 7 ... Elastic body. ! 1 Aonoda Ganto i Red Iko Corner I Tsuchidacho 1' Tokoro

Claims (1)

[Claims] ! m1111 A piezoelectric speaker characterized in that a piezoelectric moving plate that vibrates in 11 modes is attached to a shooting eye stretched on a frame with an elastic body interposed around the periphery.