JPH0511694U - Piezo speaker - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a piezoelectric speaker having a configuration capable of simplifying assembly work and preventing generation of annoying noise. A plurality of piezoelectric sounding bodies 11 and a pair of vibrating plates 2 which are arranged to face each other with a spacer 3 interposed between at least outer peripheral edges and which house the piezoelectric sounding bodies 11 in parallel. A piezoelectric speaker 1 comprising: a spacer 3 made of an insulating material, and each of the diaphragms 2 made of an elastic material having an insulating property; While the metal foil 4 having the above is attached, a supporting member 6 made of a conductive material is interposed between the piezoelectric speaker 11 and the metal foil 4 attached to each of the diaphragms 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a piezoelectric speaker including a plurality of piezoelectric sounders.

[0002]

[Prior Art]

 Conventionally, as shown in FIG. 5 and FIG. 6, a piezoelectric speaker 10 of this type is provided with a plurality of piezoelectric sounding bodies 11 and a pair of face-to-face laminated members for accommodating them in an internal space S. There is one that includes the diaphragms 12 and 12 and a speaker terminal print substrate 13 attached to one end thereof. Each of the piezoelectric sounders 11 is vibratably supported by being sandwiched between the support portions 14 extending from the inner surfaces of the vibrating plates 12 facing each other and protruding into the space S. Here, each diaphragm 12 is formed of an elastic material having an insulating property such as styrofoam.

Each of the piezoelectric sounders 11 has a circular piezoelectric ceramic plate 15 having electrodes (not shown) formed on the front and back surfaces thereof, and a large-diameter metal plate 16 attached to the back surface thereof. And each of the surface side electrodes of the piezoelectric ceramic plate 15 and each of the metal plates 16 that compose each piezoelectric speaker 11 and the speaker terminal (not shown) disposed on the speaker terminal printed board 13. ) Are individually connected to each other by means of lead wires 17 ,. The lead wires 17, ... Are fixedly supported by being sandwiched between the inner surfaces of the diaphragms 12, 12 facing each other. Note that reference numerals 18 and 18 in the drawing denote external lead wires that are drawn out from the speaker terminals to the outside.

[0004]

[Problems to be solved by the device]

 By the way, in the piezoelectric speaker 10 as the conventional example, as the number of the piezoelectric sounding bodies 11 increases, the lead wires 17, ... Which are arranged between the respective piezoelectric sounding bodies 11 and the speaker terminal printed circuit board 13. The number of the lead wires 17 increases, and it becomes necessary to wire each lead wire 17 while avoiding the other piezoelectric sounding body 11. Therefore, the wiring work of these lead wires 17, ... Is complicated. There was an inconvenience that the assembly work required a lot of work. In some cases, the lead wires 17, ... Are not firmly fixed and supported by the diaphragms 12, 12. In such a case, the lead wires 17 ,. There was also the inconvenience of causing annoying noise accompanying the noise.

The present invention was devised in view of such inconvenience, and can simplify the assembling work and can prevent the generation of annoying noise. The purpose is to provide a speaker.

[0006]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention is arranged so as to face each other with a plurality of piezoelectric sounding bodies and at least a spacer interposed between the outer peripheral edges thereof, and the piezoelectric sounding bodies are opposed to each other. A piezoelectric speaker comprising a pair of vibrating plates housed in parallel, wherein the spacer is made of an insulating material, and each of the vibrating plates is made of an elastic material having an insulating property, and is opposed to each other. While a conductive metal foil is attached to the inner surface, a supporting member made of a conductive material is interposed between the piezoelectric speaker and the metal foil attached to each of the diaphragms. It is a feature.

[0007]

[Action]

 According to the above configuration, the conductive metal foil attached to the inner surface of the diaphragm, the surface side electrode of the piezoelectric ceramic plate constituting each piezoelectric sounding body, and the metal plate are mutually supported via the supporting member. Therefore, if a lead wire for external extraction is attached to each metal foil at a predetermined position, a piezoelectric speaker can be constructed without using a large number of lead wires.

[0008]

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway perspective view showing a schematic configuration of a piezoelectric speaker according to this embodiment, FIG. 2 is a side sectional view taken along line AA of FIG. 1, and FIG. It is a broken perspective view, and reference numeral 1 in these drawings is a piezoelectric speaker. Since the structure of the piezoelectric speaker itself included in the piezoelectric speaker 1 is the same as that of the conventional example, parts and portions in FIGS. 1 to 3 which are the same as those in FIGS. 5 and 6 are denoted by the same reference numerals. , Detailed description is omitted here.

The piezoelectric speaker 1 is provided with a plurality of piezoelectric sounding bodies 11 formed by bonding a piezoelectric ceramic plate 15 and a metal plate 16 which are both circular in shape, and the piezoelectric sounding bodies 11 are arranged so as to face each other. A pair of vibrating plates 2 and 2 for accommodating them in parallel, and a spacer 3 sandwiched along the outer peripheral edges of the vibrating plates 2 and 2 so as to separate them from each other. Each of the vibrating plates 2 and 2 is formed as a rectangular flat plate made of an elastic material having an insulating property such as styrofoam, and the inner surfaces facing each other are made of copper foil or the like. The metal foil 4 having such conductivity is attached over almost the entire surface. Further, external lead-out wires 18, 18 are attached to the respective ends of the metal foils 4 facing each other by soldering or joining using a conductive adhesive (not shown).

On the other hand, the spacer 3 sandwiched between the vibration plates 2 and 2 is formed in a rectangular frame shape by using an insulating material, and the lead wire 18 for external extraction is formed from the opening 3a formed by the cutout. , 18 are drawn toward the outside. In addition, when the mechanical strength of the piezoelectric speaker 1 is emphasized, as shown in the modified example of FIG. 3, another spacer 5 formed in a cross shape is formed at the substantially central position between the diaphragms 2 and 2. It may be reinforced by interposing.

Further, between the piezoelectric sounding bodies 11 thus accommodated in parallel between the vibration plates 2 and 2 and the metal foil 4 attached on the inner surface of each vibration plate 2, for example, copper is used. A short round bar-shaped support member 6 made of a conductive material such as a carbon or carbon is interposed, and these are joined to each other using a conductive adhesive (not shown). Therefore, in this piezoelectric speaker 1, the metal foil 4 attached on the inner surface of each of the vibrating plates 2 and 2 and the electrodes on the front surface side of the piezoelectric ceramic plate 15 and the metal plate 16 that compose each piezoelectric speaker 11 are provided. Each of them is electrically connected through the support member 6.

By the way, in the above description, the external lead wires 18, 18 are attached to each end of the metal foil 4 attached to the inner surface of each of the diaphragms 2, 2. It is not limited. That is, as in the other embodiment in which only the main part is shown in FIG. 4, the tongue piece 4a is formed at one end of each of the metal foils 4 and 4 attached on the inner surfaces of the diaphragms 2 and 2. Alternatively, the tongues 4a may be pulled out to the end faces of the diaphragms 2 and attached in advance, and the external lead wires 18, 18 may be attached to the respective tongues 4a. When such a configuration is adopted, it is not necessary to form the opening 3a in the spacer 3 sandwiched between the diaphragms 2 and 2, so that the diaphragms spaced apart via the spacer 3 are not necessary. It becomes possible to seal the inside of 2, 2 in a more effective state.

[0014]

[Effect of the device]

 As described above, in the piezoelectric speaker according to the present invention, the surface side electrodes of the piezoelectric ceramic plates and the metal plates constituting each piezoelectric speaker and the lead wire for external extraction are on the inner surface of each diaphragm. It is connected through a conductive metal foil attached to. Therefore, unlike the conventional example, it is not necessary to connect each piezoelectric speaker and the lead wire for external extraction with a large number of lead wires, and it is not necessary to perform complicated wiring work for that, and as a result, the assembly work of the piezoelectric speaker is performed. It is possible to save time and labor, and to simplify the assembling work. Further, since the lead wire is not used, contact between the lead wires and resonance cannot occur, and it is possible to reliably prevent the generation of annoying noise accompanying these.

Furthermore, according to the present invention, since the storage space of the piezoelectric sounding bodies between the diaphragms is significantly increased, it is possible to increase the number of stored piezoelectric sounding bodies, and the storage position of each piezoelectric sounding body can be freely set. There is also an advantage that the placement can be optimized by adjusting.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a schematic configuration of a piezoelectric speaker according to an embodiment.

FIG. 2 is a side sectional view taken along the line AA of FIG.

FIG. 3 is a partially cutaway perspective view showing a schematic configuration of a piezoelectric speaker according to a modification thereof.

FIG. 4 is a partially cutaway perspective view showing a main configuration of a piezoelectric speaker according to another embodiment.

FIG. 5 is a partially cutaway perspective view showing a schematic configuration of a piezoelectric speaker according to a conventional example.

6 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 1 Piezoelectric speaker 2 Vibration plate 3 Spacer 4 Metal foil 6 Supporting member 11 Piezoelectric speaker

Claims (1)

Claims for utility model registration: 1. A plurality of piezoelectric sounding bodies (11), which are arranged to face each other with a spacer (3) interposed at least between outer peripheral edges therebetween, and A piezoelectric speaker (1) comprising a pair of diaphragms (2) for accommodating a piezoelectric speaker (11) in parallel, wherein the spacer (3) is made of an insulating material, and the diaphragm (2). ) Is formed of an elastic material having an insulating property, and a conductive metal foil (4) is attached to the inner surfaces facing each other, while the piezoelectric sounding body (11) and the vibration plates ( A piezoelectric speaker characterized in that a supporting member (6) made of a conductive material is interposed between the metal foil (4) attached to (2) and the metal foil (4).