JP2016082369A - Horn loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a horn loudspeaker which finely controls peaks and dips of a sound having a specified frequency at low costs.SOLUTION: A horn loudspeaker 1 includes: a diaphragm 87; a back cover 95 covering the diaphragm 87; a horn 84 which emits a sound generated by vibrations of the diaphragm 87; a phase plug 86 which guides the sound generated by the vibrations of the diaphragm 87 to the horn 84; and a subtonic part 10 which allows a space BC enclosed by the back cover 95 and the diaphragm 87 to communicate with a space enclosed by the horn 84.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a horn speaker.

  FIG. 7 is a longitudinal sectional view of a conventional horn speaker 8. In FIG. 7, the throat portion 94 of the horn 84 is fixed to one end surface of the back plate 80. In the back plate 80, one bottom surface of the pole piece 85 is fixed to the end surface opposite to the horn 84. A sound guide hole 83 that penetrates both the back plate 80 and the pole piece 85 and reaches the throat portion 94 of the horn 84 is formed. The bottom surface of the pole piece 85 opposite to the back plate 80 is recessed in a mortar shape toward the sound guide hole 83, and a phase plug 86 having a plurality of slits is fitted into the mortar surface. A diaphragm 87 is supported behind the phase plug 86. The diaphragm 87 is curved in a dome shape, and a cylindrical voice coil bobbin 88 is provided on the outer peripheral portion thereof.

  Further, an annular magnet 82 and a top plate 81 having the same diameter as the back plate 80 are provided on the end surface of the back plate 80 opposite to the horn 84, and the annular magnet 82 is sandwiched between the back plate 80 and the top plate 81. Has been. The annular magnet 82 has an N pole on one bottom surface (for example, the bottom surface on the back plate 80 side) and an S pole on the other bottom surface (for example, the bottom surface on the top plate 81 side).

  The inner peripheral wall of the top plate 81 is opposed to the outer peripheral wall of the pole piece 85 with a minute interval. The magnetic loop composed of the back plate 80, the annular magnet 82, the top plate 81, the phase plug 86, and the pole piece 85 constitutes a magnetic circuit that makes a round of the lines of magnetic force generated by the annular magnet 82. . In this magnetic circuit, the diaphragm 87 is supported in a state in which the voice coil bobbin 88 at the peripheral end is housed in the magnetic gap AG between the inner peripheral wall of the top plate 81 and the outer peripheral wall of the pole piece 85.

  The structure for supporting the diaphragm 87 is as follows. First, a spacer ring 90 is fixed to the end surface of the top plate 81 opposite to the annular magnet 82. An edge 89 is interposed between the inner peripheral wall of the spacer ring 90 and the outer peripheral portion of the diaphragm 87. The spacer ring 90 supports the outer peripheral portion of the edge 89. The edge 89 supports the outer peripheral portion of the diaphragm 87. That is, the edge 89 surrounds and supports the diaphragm 87 from the outside, and the spacer ring 90 surrounds and supports the edge 89 from the outside.

  In the horn speaker 8 having the above configuration, the magnetic flux generated by the annular magnet 82 passes through the magnetic gap AG between the top plate 81 and the pole piece 85. When a current is passed through the voice coil in the voice coil bobbin 88, a driving force in a direction parallel to the central axis ax of the pole piece 85 is given to the voice coil bobbin 88, and the diaphragm 87 fixed to the voice coil bobbin 88 vibrates. . That is, the diaphragm 87 functions as a diaphragm, and the spacer ring 90 functions as a diaphragm holding member that supports the diaphragm 87 via the edge 89. When the diaphragm 87 vibrates, the vibration causes the air in the space OS between the diaphragm 87 and the phase plug 86 to be pushed out or pulled back to the sound guide hole 83 through the slits of the phase plug 86. Then, the dense wave of the air that is pushed out or pulled back is emitted as a sound wave from the sound emitting hole 96 surrounded by the horn 84 via the sound guide hole 83.

  In FIG. 7, both end surfaces of the back cover 95 are fixed to the end surface of the spacer ring 90 opposite to the top plate 81. In the conventional horn speaker 8, a standing wave is generated by the vibration of the diaphragm 87 in the back cavity BC, which is a space surrounded by the diaphragm 87, the edge 89, the spacer ring 90, and the back cover 95. Distorted sound was generated. Sound distortion means that a dip or peak appears in the frequency characteristics of the horn speaker 8 that should ideally be flat. In particular, a horn speaker for a high sound range is required to be able to reproduce a sound having a very high frequency (for example, a frequency around 20 kHz, which is the upper limit of the audible band). The effect of strain is significant. Various techniques for controlling such sound distortion and improving sound quality have been proposed. For example, Patent Document 1 discloses a technique for removing sound distortion by signal processing. Patent Document 2 discloses a technique for providing a sound absorbing material on the back cover 95.

JP-A-8-317490 JP-A-3-070395

  In the technology for removing the distortion of sound by signal processing as disclosed in Patent Document 1, a signal processing device must be provided separately, which places a heavy burden on the user in terms of cost and signal processing device settings. There is a problem of becoming.

  In the technology of providing a sound absorbing material on the back cover 95 as disclosed in Patent Document 2, the sound absorbing material absorbs not only a sound having a resonance frequency causing a standing wave but also a sound having a frequency other than the resonance frequency. Therefore, there is a problem in that the sound having a wide frequency is affected. Furthermore, there is a problem that the cost is increased because a separate part called a sound absorbing material is provided.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a technology that enables fine and inexpensive control of sound distortion in a horn speaker.

  In order to solve the above problems, the present invention provides a diaphragm, a back cover that covers the diaphragm, a horn that radiates sound generated by vibration of the diaphragm, and guides sound generated by vibration of the diaphragm to the horn. There is provided a horn speaker comprising a phase plug, a space surrounded by the back cover and the diaphragm, and a sound guide section that communicates the space surrounded by the horn.

  In the horn speaker of the present invention, the space surrounded by the back cover and the diaphragm, and the space surrounded by the horn communicate with each other through the sound guide portion, and the diaphragm is vibrated and generated in the former space. Sound is guided to the latter space. According to the horn speaker of the present invention, sound distortion can be eliminated by superimposing the sound emitted from the horn without passing through the sound guiding portion and the sound guided by the sound guiding portion.

  For example, a first path through which sound reaches the horn from the diaphragm via the phase plug and a second path through which sound reaches the horn from the diaphragm via the sound guide unit When the difference is an odd multiple of the half wavelength of the sound to be controlled, the sound to be controlled is a sound that is a dip in the frequency characteristics of the horn speaker when the sound conducting section is not provided. Further, when the path difference is an even multiple of a half wavelength of the sound to be controlled, the sound to be controlled is a sound that has a peak in the frequency characteristics.

  In a more preferred embodiment, a plurality of the sound guide portions are provided. According to this aspect, when there are a plurality of sounds to be controlled, a plurality of dips or peaks can be eliminated by adjusting the length of each sound guide unit according to the wavelength of the sound to be controlled.

  In a more preferred aspect, the sound guide portion is detachable. According to this aspect, since the sound guide part is detachable, the user of the horn speaker can adjust the length of the sound guide part himself and control the sound emitted by the horn speaker.

  In a more preferred aspect, a part of the wall surface of the main body of the horn speaker is a part of the wall surface of the sound guide section. According to this aspect, the horn speaker is compact even if the sound guide portion is provided in the horn speaker.

It is a longitudinal cross-sectional view of the horn speaker 1 which is 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the horn speaker 2 which is 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the horn speaker 3 which is 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the horn speaker 4 which is 4th Embodiment of this invention. It is a perspective view for demonstrating a modification (5). It is a perspective view for demonstrating a modification (7). It is a longitudinal cross-sectional view of the conventional horn speaker 8. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 is a longitudinal sectional view of a horn speaker 1 according to a first embodiment of the present invention. In FIG. 1, the same components as those in FIG. 7 are denoted by the same reference numerals. As apparent from the comparison between FIG. 1 and FIG. 7, the difference between the horn speaker 1 and the horn speaker 8 is that the horn speaker 1 has a back cavity BC and a sound emission hole 96 (that is, a space surrounded by the horn 84. ) Is provided. Below, it demonstrates focusing on the sound guide part 10. FIG.

  The sound guide portion 10 is a tube having a square cross section. As shown in FIG. 1, the sound guide section 10 allows the back cab BC and the sound emission hole 96 to communicate with each other. The sound guiding unit 10 guides the sound generated in the back cavity BC due to the vibration of the diaphragm 87 to the sound emitting hole 96. In FIG. 1, the sound guide portions 10 are provided one by one at two positions symmetrical with respect to the central axis ax of the pole piece 85, and the length of each sound guide portion 10 is the same.

  The length of the sound guide section 10 is the wavelength of the sound to be controlled (that is, the sound having a frequency that is a dip or peak in the frequency characteristics of the horn speaker 1 when there is no sound guide section 10), and the content of the control. Thus, the horn speaker 1 is adjusted at the design stage or manufacturing stage. For this reason, the user of the horn speaker 1 cannot adjust the length of the sound guide part 10 after factory shipment. Specific adjustment contents of the length of the sound guide section 10 are as follows. As shown in FIG. 1, the path of the sound generated in the space OS due to the vibration of the diaphragm 87 and guided to the sound emitting hole 96 via the phase plug 86 is defined as a path A, and the vibration in the back cavity BC is caused by the vibration of the diaphragm 87. A path of the sound that is generated and guided to the sound emission hole 96 through the sound guide portion 10 is defined as a path B. When the sound that is dip in the frequency characteristics is a control target, the sound is guided so that the difference in length between the path A and the path B (hereinafter referred to as the path difference) is an odd multiple of the half wavelength of the sound. The length of the part 10 is adjusted. On the other hand, when the sound having a peak in the frequency characteristic is a control target, the length of the sound guide unit 10 is set so that the path difference between the path A and the path B is an even multiple of the half wavelength of the sound. Adjusted. The reason for such adjustment is as follows.

  When the diaphragm 87 is pushed out toward the sound guide hole 83, the air is compressed in the space OS and the air density is increased, whereas the air density is decreased in the back cavity BC. Conversely, when the diaphragm 87 is pulled back from the direction of the sound guide hole 83 in the reverse direction, the air density is reduced in the space OS, and the air density is increased in the back cavity BC. Thus, the sound generated in the space OS and the sound generated in the back cavity BC are in opposite phases at the time of generation of each sound. Since the phases are opposite to each other, if the path difference between the path A and the path B is an odd multiple of the half wavelength of the generated sound, they are strengthened and the dip is eliminated. On the contrary, if the path difference is an even multiple of the half wavelength of the generated sound, they are weakened and the peak is suppressed. For this reason, in this embodiment, the length of the sound guide part 10 is adjusted as described above.

  In the horn speaker 1, Helmholtz resonance can be generated with the sound guide portion 10 as a neck and the back cavity BC as a cavity, and sound distortion can also be eliminated by using this Helmholtz resonance. For example, when a sound that is a dip in the frequency characteristic is a control target and Helmholtz resonance is used to eliminate the dip, the Helmholtz resonance frequency and the dip What is necessary is just to adjust the cross-sectional area and length of the sound-conduction part 10, or the volume of the back cavity BC so that the frequency which has become equal. Further, the adjustment of the Helmholtz resonance and the tube resonance described above (the length of the sound guide unit 10 is adjusted so that the path difference between the path A and the path B is an odd multiple or an even multiple of the half wavelength of the sound to be controlled). Dip) can be efficiently eliminated. Further, if the Helmholtz resonance frequency and the resonance frequency of the tube resonance are different, two kinds of sounds corresponding to both can be adjusted. Note that the fact that the user cannot adjust the Helmholtz resonance frequency after the factory shipment of the horn speaker 8 is the same as that the tube resonance resonance frequency cannot be adjusted after the factory shipment.

  In the case of the horn speaker 1 of the present embodiment, since a signal processing device is not used for eliminating sound distortion, the horn speaker 1 is inexpensive and less burdensome on the user than the technique disclosed in Patent Document 1. Sound distortion can be eliminated. Further, by using tube resonance or Helmholtz resonance (or by using both in combination), only a specific frequency sound can be controlled, and the frequency is controlled more finely than the technique disclosed in Patent Document 2. can do. Furthermore, in the horn speaker 1, since the sound is controlled using the sound guide portion 10 instead of the sound absorbing material, the sound can be controlled at low cost.

Second Embodiment
FIG. 2 is a longitudinal sectional view of a horn speaker 2 according to the second embodiment of the present invention. In FIG. 2, the same components as those in FIG. 1 are denoted by the same reference numerals. As is clear from a comparison between FIG. 2 and FIG. 1, the sound guide section 20 </ b> A and the sound guide section 20 </ b> B of the horn speaker 2 correspond to the sound guide section 10 of the horn speaker 1. Below, it demonstrates centering on the sound guide part 20A and the sound guide part 20B.

  The cross sections of the sound guide portion 20A and the sound guide portion 20B are square, and the cross-sectional areas are the same, but the lengths are different. The lengths of the sound guide portions 20A provided one by one at two positions symmetrical with respect to the central axis ax of the pole piece 85 are the same. The same applies to the length of the sound guide portion 20B. The lengths of the sound guide section 20A and the sound guide section 20B are adjusted at the design stage and manufacturing stage of the horn speaker 2 according to the wavelengths of the two types of sound to be controlled and the control contents. The specific contents of the adjustment are the same as in the first embodiment. For example, when the sound that is dip in the frequency characteristics of the horn speaker 2 when there is neither the sound guide portion 20A nor the sound guide portion 20B is to be controlled by the sound guide portion 20A, the vibration of the diaphragm 87 Is generated in the space OS and is generated in the back cavity BC by the vibration of the sound path A and the diaphragm 87 which is guided to the sound output hole 96 through the phase plug 86 and enters the sound output hole 96 through the sound guide portion 20A. The length of the sound guide 20A may be determined so that the difference in the route B of the guided sound is an odd multiple of the half wavelength of the sound. Similarly, when the sound control unit 20A controls a sound that has a peak in the frequency characteristic, the length of the sound guide unit 20A is set so that the path difference is an even multiple of a half wavelength of the sound. Can be determined. The same applies to the sound guide portion 20B. In this embodiment as well, the lengths of the sound guide section 20A and the sound guide section 20B have been adjusted at the time of factory shipment and cannot be changed by the user after factory shipment.

  Similarly to the first embodiment, the horn speaker 2 can also eliminate sound distortion by using Helmholtz resonance with the sound guide portion 20A or the sound guide portion 20B as a neck and the back cavity BC as a cavity. Adjust the cross-sectional area of each sound guide section so that the frequency of the Helmholtz resonance generated by using the sound guide section 20A as the neck and the frequency of the Helmholtz resonance generated by using the sound guide section 20B as the neck are equal. Alternatively, the cross-sectional area of each sound guide portion may be adjusted so that they are different. When both are made equal, the cross-sectional area or the volume of the back cavity BC may be adjusted so that the Helmholtz resonance frequency becomes equal to one of the resonance frequencies of the tube resonance. Similarly, when the Helmholtz resonance frequency having the sound guide portion 20A as a neck and the Helmholtz resonance frequency having the sound guide portion 20B as a neck are different, one of them is set equal to one of the resonance frequencies of the tube resonance. The cross-sectional area or the volume of the back cavity BC may be adjusted.

  Similarly to the first embodiment, the horn speaker 2 of the present embodiment can eliminate the distortion of the sound of the horn speaker 2 at a lower cost and without burdening the user as compared with the technique disclosed in Patent Document 1. Can do. Further, the frequency can be controlled more finely than the technique disclosed in Patent Document 2, and the sound can be controlled at a low cost. Furthermore, if it is the horn speaker 2 like this embodiment, the variation of adjustment can be expanded compared with 1st Embodiment.

<Third Embodiment>
FIG. 3 is a longitudinal sectional view of a horn speaker 3 according to a third embodiment of the present invention. In FIG. 3, the same components as those in FIG. 1 are denoted by the same reference numerals. As is clear from a comparison between FIG. 3 and FIG. 1, the sound guide section 30 </ b> A, the sound guide section 30 </ b> B, the sound guide section 30 </ b> C, and the pin 300 of the horn speaker 3 correspond to the sound guide section 10 of the horn speaker 1. Hereinafter, description will be made focusing on the sound guide portion 30A, the sound guide portion 30B, the sound guide portion 30C, and the pin 300.

  The sound guide portion 30B is fixed to the horn 84, and the sound guide portion 30C is fixed to the back cover 95. Therefore, for example, the user of the horn speaker 3 cannot change the sound guide unit 30B and the sound guide unit 30C after the horn speaker 3 is shipped from the factory. On the other hand, the sound guide portion 30A is detachably attached to the sound guide portion 30B and the sound guide portion 30C by pins 300. The sound guide part 30A is fixed to the sound guide part 30B and the sound guide part 30C by a pin 300, and is the same as the sound guide part 10 of the first embodiment and the sound guide part 20A and the sound guide part 20B of the second embodiment. Play a role.

  In this embodiment, various lengths of the sound guide section 30A are prepared, and the user may replace the sound guide section 30A attached to the horn speaker 3 according to the wavelength of the sound to be controlled and the control content. it can. In the present embodiment, the lengths of the sound guide portions 30A provided one by one at two positions symmetrical with respect to the central axis ax of the pole piece 85 are the same.

  Similar to the first and second embodiments, the horn speaker 3 also uses Helmholtz resonance with the sound guide section 30A, the sound guide section 30B, and the sound guide section 30C as necks and the back cavity BC as a cavity. Sound distortion can be eliminated. In the present embodiment, after the horn speaker 3 is shipped from the factory, for example, the user can adjust the generation of the Helmholtz resonance by replacing the sound guide section 30A. Different from form.

  In the case of the horn speaker 3 as in the present embodiment, the horn speaker 3 is less expensive and less burdensome on the user than the technique disclosed in Patent Document 1, as in the first and second embodiments. The distortion of sound can be eliminated. Further, the frequency can be controlled more finely than the technique disclosed in Patent Document 2, and the sound can be controlled at a low cost. Furthermore, in the case of the horn speaker 3 as in the present embodiment, unlike the first embodiment and the second embodiment, the user can change the sound guiding portion 30A even after the horn speaker 3 is shipped from the factory. Sound distortion can be adjusted.

<Fourth embodiment>
FIG. 4 is a longitudinal sectional view of a horn speaker 4 according to a fourth embodiment of the present invention. In FIG. 4, the same components as those in FIG. 1 are denoted by the same reference numerals. As is clear from a comparison between FIG. 4 and FIG. 1, the sound guide section 40 of the horn speaker 4 corresponds to the sound guide section 10 of the horn speaker 1. Below, it demonstrates centering on the sound guide part 40. FIG.

  The sound guide section 40 is a tube having a square cross section, and as shown in FIG. 4, a part of the wall surface of the horn speaker 4 main body comprising the spacer ring 90, the top plate 81, the annular magnet 82 and the back plate 80 is the sound guide section. It is a part of the wall surface of the portion 40. The role of the sound guide part 40 is the same as the role of the sound guide part 10 of the first embodiment and the sound guide part 20A and the sound guide part 20B of the second embodiment. The lengths of the sound guide portions 40 provided one by one at two positions symmetrical with respect to the central axis ax of the pole piece 85 are the same.

  Similarly to the first to third embodiments, the horn speaker 4 can also eliminate sound distortion by using Helmholtz resonance with the sound guide section 40 as a neck and the back cavity BC as a cavity.

  In the case of the horn speaker 4 as in the present embodiment, as in the first to third embodiments, the sound of the horn speaker 4 is less expensive and less burdensome on the user than the technique disclosed in Patent Document 1. The distortion of can be eliminated. Further, the frequency can be controlled more finely than the technique disclosed in Patent Document 2, and the sound can be controlled at a low cost. Furthermore, in the case of the horn speaker 4 as in the present embodiment, the sound guide section 40 and the main body of the horn speaker 4 share the wall surface, and therefore the horn speaker 4 can be made compact.

<Modification>
Although the first to fourth embodiments of the present invention have been described above, it goes without saying that the following modifications may be added to these embodiments.
(1) In the above embodiment, the cross-sectional shape of the sound guide portion of each embodiment is square, but the cross-sectional shape of the sound guide portion is trapezoidal or round according to the sound quality of the sound to be emitted and the design of the horn speaker. It may be a shape. Further, the sound guide portion is not limited to a long and narrow tube, but is a space that covers the compression driver (that is, the compression driver including the phase plug 86 and the diaphragm 87) of the horn speaker in the above-described embodiment (that is, rotates around the central axis ax). It may be a shape that forms a body space).

(2) In the above-described embodiment, one sound guide portion is provided at two positions symmetrical with respect to the central axis ax of the pole piece 85 of each embodiment, but this symmetry is broken. Good. For example, all the sound guide portions may be provided only above the horn speaker from the central axis ax. Further, the sound guide portion may be provided so as to go around the horn speaker around the central axis ax.

(3) In the above embodiment, the lengths of the sound guide portions provided at positions symmetrical with respect to the central axis ax are the same, but may be different. The variation of adjustment can be expanded by making the length of each sound guide part different.

(4) The second embodiment and the third embodiment may be combined. For example, the sound guide 20B of the horn speaker 2 of the second embodiment may be configured such that the user can change the length as in the third embodiment.

(5) The second or third embodiment may be combined with the fourth embodiment. In this aspect, in addition to the effects of the second or third embodiment, the horn speaker can be made compact as the effect of the fourth embodiment. In the case where the second embodiment and the fourth embodiment are combined, only one of the two types of sound guide portions having different lengths has the spacer ring 90, the top plate 81, the annular magnet 82, and the back. A part of the wall surface of the horn speaker body made of the plate 80 may be used. Further, both of the two types of sound guide portions having different lengths may use a part of the wall surface of the horn speaker body. For example, FIG. 5A is a perspective view showing the sound guide portion 20A ′, and FIG. 5B is a perspective view showing the sound guide portion 20B ′. The sound guide portion 20B 'has a threshold 200 and is longer than the sound guide portion 20A'. The sound guide portion 20A 'and the sound guide portion 20B' correspond to the sound guide portion 20A and the sound guide portion 20B of the second embodiment, respectively. By using such a sound guide portion 20A 'and a sound guide portion 20B', it is possible to adopt a mode in which the second embodiment and the fourth embodiment are combined. Furthermore, only one of the two types of sound guides uses a part of the wall surface of the horn speaker body, and the other sound guide part uses a part of the wall surface of the horn speaker body. A part of the wall surface of the sound part may be used.

(6) In the third embodiment, the pin 300 is used to fix the sound guide part 30A, the sound guide part 30B, the sound guide part 30A, and the sound guide part 30C, but the sound guide part 30A is the sound guide part. Any method may be used as long as it can be fixed to 30B or the sound guide portion 30C. For example, the pin 300 is a screw, screw holes are provided in the sound guide portion 30A, the sound guide portion 30B, and the sound guide portion 30C, and the sound guide portion 30A, the sound guide portion 30B, and the sound guide portion 30A and the sound guide portion 30C are screws. It may be fixed by.

(7) In 3rd Embodiment, 30 A of sound guide parts may have the structure which can be expanded-contracted. FIG. 6 is a perspective view of the sound guide portion 30A 'showing this aspect. A slide mechanism 320 is provided in the sound guide portion 30 </ b> A ′, and the length of the sound guide portion 30 </ b> A ′ is fixed by a pin 310. The user adjusts the length of the sound guide portion 30 </ b> A ′ to a length corresponding to the sound to be controlled using the slide mechanism 320, and fixes the length of the sound guide portion 30 </ b> A ′ with the pin 310. With such a sound guide portion 30A ', it is not necessary to prepare the sound guide portions 30A of various lengths, and the burden on the user is reduced.

(8) In the above embodiment, the spacer ring 90 supports the outer peripheral portion of the edge 89, and the edge 89 supports the outer peripheral portion of the diaphragm 87. However, the edge 89 and the diaphragm 87 may be integrated. . In this embodiment, the spacer ring 90 directly supports the outer peripheral portion of the diaphragm 87. The back cavity BC in this embodiment is a space surrounded by the diaphragm 87, the spacer ring 90 and the back cover 95. Further, the spacer ring 90 may be omitted. In this case, both end surfaces of the back cover 95 are directly fixed to the end surface of the top plate 81 opposite to the annular magnet 82. In this embodiment, when the edge 89 and the diaphragm 87 are not integrated, the outer peripheral portion of the edge 89 may be supported by the inner peripheral portion of the top plate 81 or the inner peripheral portion of the back cover 95 may be supported. . The back cavity BC in this embodiment is a space surrounded by the diaphragm 87, the edge 89 and the back cover 95. Further, when the edge 89 and the diaphragm 87 are integrated in an aspect in which the spacer ring 90 is omitted, the outer peripheral portion of the diaphragm 87 may be supported by the inner peripheral portion of the top plate 81 or the inner periphery of the back cover 95. The part may support it. The back cavity BC in this embodiment is a space surrounded by the back cover 95 and the diaphragm 87.

1, 2, 3, 4, 8... Horn speaker, 10, 20A, 20B, 20A ', 20B', 30A, 30A ', 30B, 30C, 40 ... Sound guiding part, 200 ... Threshold, 300, 310 ... Pin, 320 ... Slide mechanism, 80 ... Back plate, 81 ... Top plate, 82 ... Annular magnet, 83 ... Sound guide hole, 84 ... Horn, 85 ... Pole piece, 86 ... Phase plug, 87 ... diaphragm, 88 ... voice coil bobbin, 89 ... edge, 90 ... spacer ring, 94 ... throat portion, 95 ... back cover, 96 ... sound vent, ax ... center axis, OS ... space, AG ... magnetic gap, BC ... back cavity.

Claims (3)

Diaphragm,
A back cover covering the diaphragm;
A horn that emits sound generated by vibration of the diaphragm;
A phase plug for guiding the sound generated by the vibration of the diaphragm to the horn;
A sound guide that communicates the back cover and the space surrounded by the diaphragm and the space surrounded by the horn;
A horn speaker characterized by comprising: There is a path difference between a first path through which sound reaches the horn from the diaphragm via the phase plug and a second path through which sound reaches the horn from the diaphragm via the sound guide unit. The horn speaker according to claim 1, wherein the horn speaker is an odd multiple or an even multiple of a half wavelength of the sound to be controlled. The horn speaker according to claim 1 or 2, wherein a part of a wall surface of the main body of the horn speaker is a part of a wall surface of the sound guide section.

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