JP2007180798A - Hybrid speaker system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide new constitution of a hybrid speaker combining a conductive speaker unit and a piezoelectric speaker unit. <P>SOLUTION: In an acoustic interference room 18 to be a substantial closed space constituting a first acoustic means, a compressional wave generated by driving the conductive speaker unit 20 and a compressional wave generated by driving first and second piezoelectric elements 22, 23 in the piezoelectric speaker unit 25 are allowed to interfere with each other to generate a first composite compressional wave. Further, a gap part 33 between a first diaphragm 26 and a second diaphragm 32 of the piezoelectric speaker unit 25 becomes a second acoustic vibration means, and the first composite compressional wave and a compressional wave generated by driving a third piezoelectric element 24 in the piezoelectric speaker unit 25 are allowed to interfere with each other to generate a second composite compressional wave. The first and second piezoelectric elements 22, 23 are supported on the center of the first diaphragm 26 and arranged in the first acoustic means and the third piezoelectric element 24 is supported on the center of the second diaphragm 32 and arranged in the second acoustic means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hybrid type speaker system using a combination of a conductive vibration speaker unit and a piezoelectric vibration speaker unit.

  As a speaker system, a dynamic speaker using a conductive vibrator has been popular for a long time, but due to its mechanism and principle, it has a fatal defect that it is almost impossible to faithfully reproduce the original sound. .

  Speakers using piezoelectric vibrators such as bimorphs (also called ceramic speakers) have also been developed, but they have excellent mid- and high-pitched sound reproducibility. Is difficult.

In view of this, a hybrid speaker having both a piezoelectric vibrator and a conductive vibrator has been proposed. For example, Patent Document 1 below discloses a speaker system including a piezoelectric vibrator and a conductive vibrator attached to an acoustic diaphragm via a primary treble diaphragm and a primary vibrator for bass. .
JP, 2001-238285, A In following patent documents 2, a large volume part provided with a dynamic speaker and a small volume part provided with an acoustic diaphragm driven by a plurality of piezoelectric diaphragms are formed in a speaker box by a partition wall. A speaker system having a configuration provided as a separated substantially enclosed space is disclosed. In this speaker system, the dynamic speaker is in charge of bass and the acoustic diaphragm is in charge of treble. Utility Model Registration No. 3037167

  However, hybrid speakers as disclosed in Patent Documents 1 and 2 show satisfactory performance, although some improvements in bass characteristics are observed compared to the case where a piezoelectric vibrator is used alone. It wasn't possible.

  In other words, in the speaker system described in Patent Document 1, the piezoelectric vibrator and the conductive vibrator are disposed adjacent to each other, so that the piezoelectric vibrator is more than necessary due to the influence of the sound pressure emitted from the conductive vibrator. Although it vibrates and a clear sound can be generated in the high sound range, the desired sound pressure cannot be reproduced in the mid sound range.

  Further, in the speaker system described in Patent Document 2, the low sound from the dynamic speaker and the high sound from the piezoelectric diaphragm speaker are generated from separate volume parts, respectively, so that it is easy to hear as an unnatural sound lacking fusion. There is a problem.

  As a result of further research and development on a hybrid type speaker system in which a conductive type vibration body (dynamic speaker) and a piezoelectric type vibration body (ceramic speaker) are combined, the present inventors have developed a sparse / dense state emitted from each of these vibration bodies. By first interfering with the waves in the speaker box and synthesizing a new density wave, and outputting the synthesized density wave to the outside, it is heard by the human ear as a “good sound” that could not be obtained in the past. As a result, the present invention has been completed.

  The present invention is based on an acoustic philosophy that is completely different from the conventional speaker pursuing faithful reproducibility of the original sound. As long as the sound reproduction mechanism of the speaker is to convert and amplify the original sound, which is a physical phenomenon called air dense wave, and convert it into an electric signal and reproduce it as sound again, the original sound is faithfully reproduced. In the first place, there is a limit to the proposition of recreating it, and even if this is pursued, it is impossible to obtain satisfactory results. On the other hand, the hybrid speaker system of the present invention is not only used in combination of a conductive vibration speaker and a piezoelectric vibration speaker, but also by mixing coarse and dense waves emitted from each in a single substantially enclosed space. It proposes to generate a new density wave, in other words, to generate a new sound and output it.

  That is, according to the first aspect of the present invention, in the hybrid type speaker in which the conductive vibration speaker unit and the piezoelectric vibration speaker unit are combined, the density wave generated by driving the conductive vibration speaker unit and the density generated by driving the piezoelectric vibration speaker unit. First acoustic interference means for generating a first synthetic dense wave by interfering with the wave, and a second synthetic dense wave by causing the first synthetic dense wave and the dense wave generated by driving the piezoelectric vibration speaker unit to interfere with each other. And second acoustic means for generating a wave.

  According to a second aspect of the present invention, in the hybrid type speaker according to the first aspect, the first acoustic interference means is formed as a substantially enclosed space in the speaker box, and the second acoustic interference means is formed between the substantially enclosed space and the external environment. It is characterized by being formed as an open area between the two.

  According to a third aspect of the present invention, in the hybrid type speaker according to the first or second aspect, the conductive vibration speaker unit is provided in the first enclosure, and the piezoelectric vibration speaker unit is located above the first enclosure. The substantially enclosed space formed in the first enclosure serves as the first acoustic interference means.

  According to a fourth aspect of the present invention, in the hybrid type speaker according to the third aspect, the first vibration in which the piezoelectric vibration speaker unit is attached so as to be able to vibrate with respect to an opening formed in at least one surface of the second enclosure. A plate, one or more inner piezoelectric elements supported by the first diaphragm at the center, a second diaphragm coupled to the outside of the first diaphragm at an appropriate interval, and a center supported by the second diaphragm. And a gap portion between the first diaphragm and the second diaphragm serves as the second acoustic interference means.

  According to a fifth aspect of the present invention, in the hybrid type speaker according to the fourth aspect, the second diaphragm is larger than the first diaphragm and is made of a material having a lower density than the first diaphragm. To do.

  According to a sixth aspect of the present invention, in the hybrid type speaker according to any one of the third to fifth aspects, the piezoelectric vibration speaker unit is disposed on a partition plate that partitions the first enclosure and the second enclosure toward the second enclosure. It is characterized by being.

  According to a seventh aspect of the present invention, in the hybrid type speaker according to the sixth aspect, communication means for communicating the internal space of the first enclosure and the second enclosure is formed, and the interior of the first enclosure is driven by driving the piezoelectric vibration speaker unit. It is characterized in that the dense wave generated in the space enters the second enclosure through the communication means.

  According to an eighth aspect of the present invention, in the hybrid type speaker according to the seventh aspect, a partition plate that partitions the internal space of the first enclosure and the second enclosure is provided, and a communication path that passes through the partition plate serves as the communication means. It is characterized by comprising.

  According to a ninth aspect of the present invention, in the hybrid type speaker according to the eighth aspect, the piezoelectric vibration speaker unit is disposed on the partition plate toward the second enclosure, and the dense wave generated by driving the piezoelectric vibration speaker unit is directly second. The dense waves generated in the internal space of the first enclosure from the back side of the piezoelectric vibration speaker unit enter the second enclosure through the communication path while traveling through the internal space of the enclosure.

  According to a tenth aspect of the present invention, in the hybrid type speaker according to the sixth aspect, the piezoelectric vibration speaker unit is disposed outwardly on a side surface of the first enclosure, and the piezoelectric vibration speaker unit is driven by driving the piezoelectric vibration speaker unit. A dense wave generated in the internal space of the first enclosure from the back side is caused to enter the second enclosure through the communication means.

  According to an eleventh aspect of the present invention, in the hybrid type speaker according to the tenth aspect, the communication means includes a through hole formed in a top surface of the second enclosure of the first enclosure and a substantially aligned with the through hole. It has a guide tube that penetrates the bottom surface of the two enclosures and opens in the internal space of the second enclosure.

  According to a twelfth aspect of the present invention, in the hybrid type speaker according to the eleventh aspect, the guide tube is opened at a height position substantially at the center of the inner and outer piezoelectric elements of the piezoelectric vibration speaker unit. .

  According to a thirteenth aspect of the present invention, in the hybrid type speaker according to the tenth or eleventh aspect, a sound in which the communication means is fitted in the through hole in order to adjust a sound pressure transmitted from the first enclosure to the second enclosure. It further has a pressure adjustment bush.

  The present invention relates to a hybrid speaker system in which a conductive vibration speaker unit and a piezoelectric vibration speaker unit are combined, and in the first acoustic means, a dense wave generated by driving the conductive vibration speaker unit and a dense wave generated by driving the piezoelectric vibration speaker unit. To generate a first synthesized dense wave, and further, a first synthesized dense wave is caused to interfere with the dense wave generated by driving the piezoelectric vibration speaker unit. Based on an idea completely different from the conventional one, a new coarse / fine wave is generated, in other words, a new sound is generated.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 shows a hybrid speaker system 10 according to a first embodiment. In this hybrid speaker system 10, a vertically long speaker box 12 is partitioned by a partition plate 14 into a lower small space portion 16 and an upper large space portion 18. As described later, the upper large space portion 18 generates a new synthesized dense wave by causing the dense wave generated by driving the conductive vibration speaker unit 20 and the dense wave generated by driving the piezoelectric vibration speaker unit 25 to interfere with each other. It acts as the first acoustic interference means or acoustic interference chamber.

  A conductive vibration speaker unit 20 made of a conductive vibrator is attached to the partition plate 14 so as to open to the large space 18 with the cone 21 facing upward. Further, the partition plate 14 is formed with an arbitrary number of communicating passages 17 for communicating the lower small space portion 16 and the upper large space portion 18 at arbitrary positions. That is, the lower small space portion 16 is a substantially sealed space, but communicates with the upper large space portion 18 via the communication path 17.

  A piezoelectric vibration speaker unit 25 including a first piezoelectric element 22, a second piezoelectric element 23, and a third piezoelectric element 24 is attached to the front panel 13 of the speaker box 12 constituting one surface of the upper large space 18. Yes.

  The first piezoelectric element 22 and the second piezoelectric element 23 are disk-shaped piezoelectric diaphragms 22a and 23a that are coaxially supported at a suitable distance from a mandrel 27 fixed to the first diaphragm 26, and the piezoelectric vibration. It has annular members 22b and 23b fixed to the outer periphery of the plate. As is well known, the piezoelectric diaphragms 22a and 23a are formed by joining thin discs made of a ferroelectric ceramic material such as barium titanate or lead zirconate titanate to both sides of a thin disc made of metal such as brass. Can be formed. The annular members 22b and 23b are made of rubber, for example, and function as vibration control pieces or inertia mass bodies.

  The first diaphragm 26 is formed of foamed polystyrene, veneer (including aviation veneer), or the like, and is attached to the support frame 28 so as to vibrate. Specifically, as shown in FIG. 2, the support frame 28 is fixed at a position slightly retracted from the front panel 13 of the speaker box 12, and an adhesive or the like is provided so as to protrude into the frame opening 28 a on the front side of the support frame 28. A quadrangular frame-shaped rubber damper 29 is fixed, and the first diaphragm 26 is fixed to the rubber damper 29 with an adhesive or the like.

  The first diaphragm 26 has an arbitrary number of openings 30 at arbitrary locations. As will be described later, the opening 30 functions as a sound emitting hole for releasing the hybrid sound generated by the primary interference in the upper large space 18 to the outside.

  A second diaphragm 32 is connected to the first diaphragm 26 via a spacer 31. Similarly to the first diaphragm 26, the second diaphragm 32 is formed of a foamed polystyrene, a veneer (including aviation veneer) or a wooden board such as a violin deck, but is formed of a material having a higher density than the first diaphragm 26. Has been. The second diaphragm 32 preferably has a larger dimension than the first diaphragm 26 and is formed in an arbitrary shape.

  Since the second diaphragm 32 is connected to the first diaphragm 26 via the spacer 31, a gap 33 is formed between the first diaphragm 26 and the second diaphragm 32. The third piezoelectric element 24 described above is attached to the second diaphragm 32 so as to face the gap portion 33, and is a disk-shaped center supported by a mandrel 34 fixed to the second diaphragm 32. A piezoelectric diaphragm 24a and an annular member 24b fixed to the outer periphery of the piezoelectric diaphragm are configured. For the piezoelectric diaphragm 24a and the annular member 24b, refer to the description of the piezoelectric diaphragms 22a and 23a and the annular members 22b and 23b in the first and second piezoelectric elements 22 and 23 described above.

  As will be described later, the gap 33 between the first diaphragm 26 and the second diaphragm 32 is generated by a dense wave synthesized in the upper large space 18 serving as an acoustic interference chamber and driving of the third piezoelectric element 24. It acts as a second acoustic interference means or acoustic interference field for synthesizing a new density wave by interference with the density wave.

  The operation of the hybrid speaker system 10 of the present embodiment configured as described above will be described.

  When the same audio signal is applied to the conductive vibration speaker unit 20 and the piezoelectric vibration speaker unit 25 from an amplifier (not shown), the cone 21 and the piezoelectric vibration of the conductive vibration speaker unit 20 according to the voltage level of the audio signal. The piezoelectric diaphragms 22a, 23a, and 24a of the speaker unit 25 vibrate to generate an air density wave.

  Density waves from the conductive vibration speaker unit 20 spread to the upper large space 18 at a relatively slow speed. The dense wave from the conductive vibration speaker unit 20 is also emitted toward the lower small space portion 16, but the lower small space portion 16 is substantially closed and communicates with the upper large space portion 18 only by the communication path 17. Therefore, this density wave also enters the upper large space 18 via the communication path 17 and proceeds.

  On the other hand, when the piezoelectric vibration speaker unit 25 is driven, the density waves generated by the vibrations of the piezoelectric vibration plates 22a and 23a of the first piezoelectric element 22 and the second piezoelectric element 23 are relatively fast in the upper large space 18. It expands with. Therefore, in the upper large space portion 18, the dense wave (A) from the conductive vibration speaker unit 20 and the dense wave (B) from the first piezoelectric element 22 and the second piezoelectric element 23 of the piezoelectric vibration speaker unit 25 are crested. -Interact so as to cancel out valleys, and generate a primary synthesized dense wave (A + B). That is, the upper large space portion 18 functions as first acoustic interference means or acoustic interference chamber. Then, the primary synthesized dense wave (A + B) generated here is emitted to the gap 33 through the sound emitting hole 30 formed in the first diaphragm 26.

  The piezoelectric vibration speaker unit 25 also includes a third piezoelectric element 24, and the third piezoelectric element 24 is connected to the second vibration plate 32 and located in the gap portion 33. Therefore, the primary synthesized dense wave (A + B) generated in the upper large space portion 18 and emitted from the sound emitting hole 30 to the gap portion 33 is further applied to the piezoelectric diaphragm 24 a and the second diaphragm 32 of the third piezoelectric element 24. A secondary synthesized dense wave (A + B + C) is generated by interfering with the dense wave (C) generated by the vibration so as to cancel out the peaks and valleys. That is, the gap 33 between the first diaphragm 26 and the second diaphragm 32 serves as second acoustic interference means or acoustic interference field. Further, since the second diaphragm 32 is connected to the first diaphragm 26 only by the spacer 31 and is formed of a material having a density lower than that of the first diaphragm 26, the first combined dense wave (A + B) is energized. It works like this to generate a second order composite dense wave (A + B + C). This secondary synthesized dense wave (A + B + C) is emitted to the outside of the speaker 10, and the secondary synthesized coarse wave (A + B + C) is generated by an arbitrary combination of the dense waves (A), (B), and (C). It can be set freely, and infinite possibilities as a hybrid sound that humans hear as “good sound” can be pursued.

  FIG. 3 shows a hybrid speaker system 40 according to the second embodiment. The hybrid speaker system 40 is provided with a first enclosure 41 having a conductive vibration speaker unit 42 on the lower side and a second enclosure 46 having a piezoelectric vibration speaker unit 47 on the upper side.

  The first enclosure 41 is a speaker box for the conductive vibration speaker unit 42 and substantially provides a sealed space, but the cone 43 is exposed to the front surface, and a dense wave is emitted forward by the vibration. Further, in this embodiment, a bass reflex port 44 for releasing the sound pressure in the first enclosure 41 to enhance the bass range is opened on the rear surface. Further, a through hole 45 is formed in the top surface of the first enclosure 41, and the internal space of the first enclosure 41 and the internal space of the second enclosure 46 are interposed via a sound pressure adjusting bush 53 and a guide tube 54, which will be described later. Is in communication.

  The second enclosure 46 is a speaker box for the piezoelectric vibration speaker unit 47, and a piezoelectric vibration speaker unit 47 including a first piezoelectric element 48, a second piezoelectric element 49, and a third piezoelectric element 50 is attached to the front surface thereof. ing. The configuration of the piezoelectric vibration speaker unit 47 including the first to third piezoelectric elements 48, 49, 50 includes the first to third piezoelectric elements 22, 23, 24 in the hybrid speaker 10 of the first embodiment. The first diaphragm 51 is different from the first diaphragm 26 in the hybrid speaker 10 of the first embodiment, but is not described in detail because it is substantially the same as the piezoelectric vibration speaker unit 25. 30).

  The second enclosure 46 provides a substantially sealed space, but the sound pressure adjusting bush 53 fitted in the top surface through hole 45 of the first enclosure 41 and the opening formed in the bottom surface of the second enclosure 46. The internal space of the first enclosure 41 and the internal space of the second enclosure 46 are communicated with each other via a guide tube 54 fixed to an adhesive (not shown) with an adhesive or the like. The sound pressure adjusting bush 53 is formed of a material that provides a smooth surface such as a synthetic resin material such as polyester or a metal material. Similarly, the guide tube 54 can be made of a synthetic resin material such as polyester, a metal material or the like, and the upper end of the guide tube 54 is a piezoelectric vibration plate 48 a of the first to third piezoelectric elements 48, 49, 50 of the piezoelectric vibration speaker unit 47. It extends to a height position substantially equal to the common axis of 49a and 50a.

  The operation of the hybrid speaker system 40 of the present embodiment configured as described above will be described.

  When the same audio signal is applied to the conductive vibration speaker unit 42 and the piezoelectric vibration speaker unit 47 from an amplifier (not shown), the cone 43 and the piezoelectric vibration of the conductive vibration speaker unit 42 according to the voltage level of the audio signal. The piezoelectric diaphragms 48a, 49a, and 50a of the speaker unit 47 vibrate to generate an air density wave.

  The dense wave from the conductive vibration speaker unit 42 is emitted from the cone 43 to the outside of the first enclosure 41 and also emitted toward the internal space of the first enclosure 41. The progress of this density wave is relatively slow. The dense waves traveling in the internal space of the first enclosure 41 move to the internal space of the second enclosure 46 through the sound pressure adjusting bush 53 and the guide tube 54 at the upper part thereof.

  On the other hand, when the piezoelectric vibration speaker unit 47 is driven, the dense waves generated by the vibrations of the piezoelectric vibration plates 48 a and 49 a of the first piezoelectric element 48 and the second piezoelectric element 49 are relatively directed toward the inside of the second enclosure 46. It spreads at a fast speed. Accordingly, in the internal space of the second enclosure 46, a dense wave (A) from the conductive vibration speaker unit 42 and a dense wave (B) from the first piezoelectric element 48 and the second piezoelectric element 49 of the piezoelectric vibration speaker unit 47 are generated. The first-order synthesized dense waves (A + B) are generated by interfering with each other so as to cancel out the peaks and valleys. That is, the internal space of the second enclosure 46 serves as a first acoustic interference means or acoustic interference chamber. Then, the primary synthesized dense wave (A + B) generated here is emitted to the gap 55 between the first diaphragm 51 and the second diaphragm 52 through the vibration of the first diaphragm 51.

  The piezoelectric vibration speaker unit 47 includes a third piezoelectric element 50, and the third piezoelectric element 50 is connected to the second vibration plate 52 and located in the gap portion 55. Therefore, the primary synthesized dense wave (A + B) generated by the second enclosure 46 and emitted to the gap 55 is further between the dense wave (C) generated by the vibration of the piezoelectric diaphragm 50a of the third piezoelectric element 50. Then, they interfere with each other so as to cancel out the peaks and valleys to generate a secondary synthesized dense wave (A + B + C). That is, the gap 55 between the first diaphragm 51 and the second diaphragm 52 serves as second acoustic interference means or acoustic interference field. Further, since the second diaphragm 52 is connected to the first diaphragm 51 only by the spacer 56 and is formed of a material having a lower density than the first diaphragm 51, the first synthesized dense wave (A + B) is energized. It works like this to generate a second order composite dense wave (A + B + C). This secondary synthesized dense wave (A + B + C) is emitted to the outside of the speaker 40. The secondary synthesized coarse wave (A + B + C) is generated by any combination of the dense waves (A), (B), and (C). It can be set freely, and infinite possibilities as a hybrid sound that humans hear as “good sound” can be pursued.

It is a sectional side view of the hybrid type speaker by Example 1 of this invention. It is an enlarged view which shows the attaching part of the 1st diaphragm in FIG. It is a sectional side view of the hybrid type speaker by Example 2 of this invention. It is the figure which looked at the inside of a speaker box from the upper part of the hybrid type speaker of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hybrid type speaker system 12 Speaker box 14 Partition plate 16 Lower small space part 17 Communication path 18 Upper large space part (1st acoustic interference means, acoustic interference chamber)
20 Conductive Vibration Speaker Unit 21 Cone 22 First Piezoelectric Element (Inner Piezoelectric Element)
23 Second piezoelectric element (inner piezoelectric element)
24 Third piezoelectric element (outer piezoelectric element)
25 Piezoelectric vibration speaker unit 26 First diaphragm 27 Mandrel 28 Support frame 29 Rubber damper 30 Sound emitting hole 31 Spacer 32 Second diaphragm 33 Gap (second acoustic interference means, acoustic interference field)
40 Hybrid type speaker system 41 First enclosure 42 Conductive vibration speaker unit 43 Cone 44 Bass reflex port 45 Through hole 46 Second enclosure 47 Piezoelectric vibration speaker unit 48 First piezoelectric element (inner piezoelectric element)
49 Second piezoelectric element (inner piezoelectric element)
50 Third piezoelectric element (outer piezoelectric element)
51 First diaphragm 52 Second diaphragm 53 Sound pressure adjusting bush 54 Guide pipe 55 Gap 56 Spacer

Claims (13)

In a hybrid type speaker in which a conductive vibration speaker unit and a piezoelectric vibration speaker unit are combined, the first synthetic density is obtained by interfering with the dense wave generated by driving the conductive vibration speaker unit and the dense wave generated by driving the piezoelectric vibration speaker unit. First acoustic interference means for generating a wave, and second acoustic means for generating a second synthetic dense wave by causing the first synthetic dense wave and the dense wave generated by driving the piezoelectric vibration speaker unit to interfere with each other. A hybrid type speaker characterized by the above. The first acoustic interference means is formed as a substantially enclosed space in the speaker box, and the second acoustic interference means is formed as an open area between the substantially enclosed space and the outside. The described hybrid type speaker. A conductive vibration speaker unit is provided in the first enclosure, and a piezoelectric vibration speaker unit is provided in the second enclosure located above the first enclosure, so that a substantially sealed space formed in the first enclosure is the first acoustic interference. The hybrid speaker according to claim 1, wherein the hybrid speaker functions as a means. A piezoelectric vibration speaker unit is attached to an opening formed on at least one surface of the second enclosure so as to vibrate, and one or more inner piezoelectric elements supported by the first diaphragm. And a second diaphragm coupled to the outside of the first diaphragm at an appropriate interval, and one or a plurality of outer piezoelectric elements centered on the second diaphragm, the first diaphragm The hybrid speaker according to claim 3, wherein a gap between the first diaphragm and the second diaphragm functions as second acoustic interference means. The hybrid speaker according to claim 4, wherein the second diaphragm is made of a material that is larger than the first diaphragm and has a lower density than the first diaphragm. The hybrid speaker according to any one of claims 3 to 5, wherein the piezoelectric vibration speaker unit is disposed on a partition plate that partitions the first enclosure and the second enclosure toward the second enclosure. A communication means for communicating the internal space of the first enclosure and the second enclosure is formed, and the dense wave generated in the internal space of the first enclosure by driving the piezoelectric vibration speaker unit enters the second enclosure through the communication means. The hybrid type speaker according to claim 6, wherein the hybrid type speaker is configured as described above. 8. The hybrid speaker according to claim 7, wherein a partition plate for partitioning the internal space between the first enclosure and the second enclosure is provided, and a communication path that penetrates the partition plate constitutes the communication means. The piezoelectric vibration speaker unit is disposed on the partition plate toward the second enclosure, and the sparse wave generated by driving the piezoelectric vibration speaker unit directly travels through the internal space of the second enclosure, and from the back side of the piezoelectric vibration speaker unit. 9. The hybrid speaker according to claim 8, wherein the dense wave generated in the internal space of one enclosure enters the second enclosure through the communication path. A piezoelectric vibration speaker unit is disposed outwardly on the side surface of the first enclosure, and the communication means is used to generate a density wave generated in the internal space of the first enclosure from the back side of the piezoelectric vibration speaker unit by driving the piezoelectric vibration speaker unit. The hybrid type speaker according to claim 6, wherein the hybrid type speaker is made to enter the second enclosure. A through-hole formed in the top surface of the second enclosure of the first enclosure, and a guide tube that opens in the internal space of the second enclosure through the bottom surface of the second enclosure in alignment with the through-hole. The hybrid speaker according to claim 10, comprising: 12. The hybrid type speaker according to claim 11, wherein the guide tube is opened at a position substantially at the height of the center of the inner and outer piezoelectric elements of the piezoelectric vibration speaker unit. The hybrid type according to claim 10 or 11, wherein the communication means further includes a sound pressure adjusting bush fitted into the through hole for adjusting a sound pressure transmitted from the first enclosure to the second enclosure. Speaker.

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