JPS6027300A - Piezoelectric oscillator and composite speaker having this piezoelectric oscillator - Google Patents

Abstract

PURPOSE:To obtain a coaxial two-way composite speaker by using a piezoelectric oscillator consisting of a polymer compound piezoelectric material as a diaphragm for a high sound and providing directly this diaphragm on a speaker for a low sound or middle sound. CONSTITUTION:A ceramic particle and the polymer material are mixed and are bound and are formed into a domic shape, thus obtaining the polymer compound piezoelectric material. Electrodes 1a and 1b are provided on upper and lower faces to form a piezoelectric oscillator 1. The peripheral part 1a of this domic piezoelectric oscillator 1 is adhered to the center of the bottom of a diaphragm 12, which is formed into a conical shape, to attach the piezoelectric oscillator 1 to the diaphragm 12. In this case, the audio signal from an audio signal source 15 is applied to a voice coil 9 and the piezoelectric oscillator 1, and a low or middle sound band is reproduced by the diaphragm 12, and the piezoelectric oscillator 1 functions as a diaphragm for high sound and is used as a dustproof cap also.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a piezoelectric vibration T-d3 made of a polymer compound piezoelectric material.
and a composite speaker comprising this piezoelectric vibrator.

(Jou 31 (Technical Lfi)) In order to achieve good sound quality, there is a composite speaker in which the treble part and the middle or low part are divided into separate dedicated sub-nonos.

Among these types of speakers, the Coaxy/Full 2-way speaker is configured with a small-diameter high-pitched speaker installed in the center of the speaker that reproduces low to mid-range sounds. The speaker is installed on a diaphragm of a speaker for reproducing bass to mid-high ranges via a mounting device.

Furthermore, a record-proofing cap A7/f is usually provided at the center of the diaphragm of a speaker.

(Objective of the Invention) The present invention uses a piezoelectric vibrator made of a polymeric compound piezoelectric material as a diaphragm for ^ sound, and is configured to be directly installed in a speaker for C bass or middle and high frequencies, thereby making it look like a single speaker. However, in reality (Makono 7 Kiyal 2 Uni [A-type composite Subi 7J), in this case, the treble speaker is used as a Subi A7 tsupu for bass or mid-range sounds.
f4 configuration, it retains the advantage of the sound source position being the same between the treble and bass speakers as in the conventional coaxial type composite speaker, and still produces high-pitched sounds like the conventional coaxial type composite speaker. Removal of the loudspeaker (J
The object of the present invention is to provide a piezoelectric vibrator made of a piezoelectric material made of a bonded polymer and a composite speaker having the piezoelectric vibrator.

(47/ of the invention) FIGS. 1(a) and 1(b) show an embodiment of a piezoelectric vibrator made of a piezoelectric material made of a polymeric composite according to the present invention.

By the way, the piezoelectric vibrator/J used as a high-frequency speaker
'The conditions that must be met are: molding into any desired shape; 1! '7. There are a variety of existing piezoelectric 14-size types, but those used as speaker vibrators can be roughly divided into piezoelectric ceramic vibrators, polymer piezoelectric films (PV ports, etc.), and J: σ polymers. There are three types of bonded piezoelectric materials. Each of these has advantages and disadvantages, but it is preferable to use a polymer bonded piezoelectric material as a piezoelectric vibrator.

Namely, 15. First, since a piezoelectric ceramic vibrator has a high mechanical Q, it cannot be used as a speaker as it is.Currently, a cone-shaped diaphragm is glued onto a helical vibrator and used as a speaker. In other words, it cannot be used as a dome-shaped molded product (cap).

In addition, since the polymer piezoelectric film imparts piezoelectricity f=J by stretching and crystallizing the film, the piezoelectricity has a directionality i.
f, and cannot be molded into any shape. Even if it were molded, piezoelectricity would not occur. Therefore, it is inappropriate to use it as a vibrator.

On the other hand, a polymer composite piezoelectric material is a material in which piezoelectric ceramic particles are dispersed in a polymer material, and in this sense, the name of the composite material is abbreviated. Since this composite has a polymeric substance as a binder, its mechanical Q is low, and piezoelectricity is not obtained by stretching, so it can be molded into any shape and piezoelectric Therefore, it can be easily molded by methods conventionally used for molding Libra decks, such as injection, compressed air, and vacuum, and is suitable for use as a vibrator.

Therefore, in the present invention, the piezoelectric vibrator 1, for example,
・It is possible to mold it into a frame shape and use it as an extension of an electrodynamic speaker.
2 is Ij L' (this polymer composite electroconductor combines the U nomic particle and the convex molecular material as described ifQ, and is expressed as ,that time,
This embodiment C is formed into a dome shape (A), and electrodes 1a and 1b are provided on the upper surface of the dome (1) to achieve one piezoelectric vibration. , 1b
By applying sound 7jj electric current to (Due to the characteristics of piezoelectric material) electricity L-6 energy is mechanically converted into energy and vibrates, producing 8 waves of light 94 '8I. Note that 1C
is a collar-shaped peripheral portion formed during molding σ), and is formed by applying adhesive 2 to this peripheral portion IC and fixing it to the portion (=j).

Figure 2 shows another embodiment of the piezoelectric vibrator, and in this embodiment j
F electric motor 3 is formed into a flat plate shape.

Also, Figure 3 shows an example in which the piezoelectric actuator 4 is formed in a concave shape!
be,.

Figures 71 (a) and (b) show an embodiment of a speaker using the piezoelectric vibrator 1 described above. A ring-shaped magnet 6 is provided on the upper part of the cone 5, and a plate 7 is provided on the magnet 6, the inner circumferential surface of which is separated from and faces the outer circumference of the tip of the center ball portion 5a. ] A magnetic circuit/J" is constructed.

Reference numeral 8 denotes a voice coil bobbin having a voice coil 9 installed between the magnetic gap formed between the center ball portion 5a and the plate 7. One end of the damper 10 is connected to the frame 11, and the other end of the damper 10 is connected to the frame 11, by which the bobbin 8 is supported so as to be able to vibrate. At the upper end of the voice coil bobbin 8, there is a diaphragm 1 for reproducing a part of the treble range or the low range.
The bottom lJ of 2 is connected. In addition, 13 is Edge,
14 is a gasket.

Thus, a dome-shaped piezoelectric vibrator 1 is attached to the center of the bottom of the conical diaphragm 12 with its peripheral portion 1a glued.
UJ' tj is being done. In this case, the μm signal from the audio signal source 15 is applied to the voice coil 9 and the piezoelectric vibrator '1, respectively, and the low to middle range is reproduced by one or two diaphragms 12, while the piezoelectric vibrator 1 It functions as a diaphragm for squid and also serves as a dustproof cap.

FIG. 5 shows another embodiment of the speaker of the present invention,
This embodiment is characterized in that a piezoelectric vibrator 3 in the form of a C flat plate is used as a diaphragm for the high 4° range which also serves as a cap.

FIG. 6 shows still another embodiment of the speaker of the present invention, in which a concave piezoelectric vibrator 4 is used. In addition,
The peripheral portion of the piezoelectric vibrator 4 is fixed to the center of the bottom of the diaphragm 12 via an adhesive.

(Effect of bright light) As described above, according to the present invention, a piezoelectric vibrator made of a C polymer composite is used as a high-frequency diaphragm, and this polymer composite lumi-body oscillator can be molded. There is an advantage in that it is possible to easily produce 1q of vibrators in a desired shape.

], By directly installing a bass electric vibrator as a diaphragm for high-pitched sounds at the center of the bottom of the diaphragm for bass to mid-high sound reproduction via adhesive, even though it appears to be a single speaker, it is actually It has the advantage of being able to constitute a two-way coax cell type composite subinono.

Further, in this case, there is an advantage that the first device for the piezoelectric vibrator is not required, and the piezoelectric vibrator can also be used as a dustproof cap.

[Brief explanation of drawings]

Figures 1 (a) and (b) show one embodiment of the piezoelectric vibrator of the present invention, Figures 2 and 3 show other embodiments of the same as above, and Figure 4 (a) shows the speaker of the present invention. One embodiment: Figure (B) is a simplified explanatory diagram of the main parts of the same as above, and Figures 5 and 6 are respectively embodiments of the subie h according to the present invention. 1.3.4... Piezoelectric vibrator, 12... Vibration plate Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6

Claims (2)

[Claims] (1) A piezoelectric vibrator characterized in that a polymer compound piezoelectric material is molded into a desired shape, and the polymer compound piezoelectric material of h. (2) A composite speaker characterized by having a polymer compound piezoelectric vibrator as a diaphragm for treble sounds installed at the center of the bottom of the diaphragm for reproducing bass to medium and high frequencies that exhibits a cone-like shape (called Boo C).