JP2007060711A - Speaker apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker structure which maintains excellent sound quality with a simple configuration. <P>SOLUTION: The speaker structure has a first speaker which is provided with a first vibration board, a first frame to fix the perimeter of the first vibration board and a first magnetic circuit to convert signals into vibration to the first vibration board, a second speaker which is provided with a second vibration board, a second frame to fix the perimeter of the second vibration board and a second magnetic circuit to convert signals into vibration to the second vibration board, and a fixing means for fixing the rear sides of the first and second magnetic circuits. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a speaker structure.

  FIG. 7 shows a cross-sectional view of a conventional speaker structure. In FIG. 7, reference numeral 100 denotes a box-shaped speaker box in which the speaker 200 is provided. The speaker 200 includes a cone 201, a frame 202, a voice coil 203, a magnetic circuit 204, and the like. The magnetic circuit 204 includes a plate 205, a magnet 206, a yoke 207, and the like. The speaker 200 is screwed to the front surface of the speaker box 100 with a screw 101 with a frame 202.

  In the case of this conventional speaker structure, since the vibration of the speaker is easily transmitted to the speaker box, a sound with a phase shift is generated from the speaker box, and this is one of the causes of muddying the sound output from the speaker structure. In addition, in the case of the conventional speaker structure, the yoke side where the reaction of the cone movement for generating the sound is likely to vibrate, so the energy transfer efficiency from the cone to the air is poor, and this is the sound output from the speaker structure. This was one of the causes of poor transient characteristics (sound speed).

  In order to solve such problems, Japanese Patent Application Laid-Open Nos. 11-146471 and 5-153680 have a speaker structure in which a speaker is fixed to the front surface of a speaker box and a speaker yoke is directly supported by a support rod of the speaker structure. Although proposed, it is structurally weak, and when it is mounted on a car, there has been a problem that the speaker structure is damaged due to vibration during movement of the car. Moreover, in order to make it structurally strong, a new problem such as an increase in weight or a complicated structure occurs.

  It is an object of the present invention to provide a speaker structure having a simple configuration while solving the above-described problems and maintaining good sound quality.

  In order to solve the above problems, in the speaker structure according to the present invention, the first diaphragm, the first frame for fixing the outer periphery of the first diaphragm, and the signal are used to vibrate the first diaphragm. A first speaker having a first magnetic circuit for conversion, a second diaphragm, a second frame for fixing the outer periphery of the second diaphragm, and vibration of the signal to the second diaphragm It has the 2nd speaker which has the 2nd magnetic circuit for converting into, and the fixing means for fixing the back of the 1st magnetic circuit and the back of the 2nd magnetic circuit, It is characterized by the above-mentioned.

In addition, it is preferable to have means for supplying the same signal to the first and second magnetic circuits in the same phase.
Furthermore, it has a support means for supporting the speaker box and the fixing member for covering the first and second speakers, and between the first and second frames and the speaker box, the support means and the speaker box, It is preferable that the speaker box be maintained in a floating state with respect to the first and second speakers and the support means by disposing the cushioning material therebetween.

Furthermore, it is preferable to have a guide part for engaging the edge part of a speaker box in the back surface of the 1st and 2nd frame.
Further, the speaker box preferably has an opening / closing mechanism capable of opening / closing a part thereof.
Further, the fixing member includes a first rib fixed to the first magnetic circuit, a second rib fixed to the second magnetic circuit, and a connecting member for connecting the first and second ribs. It is preferable to have.

Furthermore, it is preferable to further include an intermediate support that is fixed to the fixing member and that contacts the inner surface of the speaker box. The intermediate support contacts the inner surface of the speaker box via a cushioning material, and the intermediate support has a sound absorbing material. It is preferable that it is attached.
Furthermore, it is preferable that the speaker box has an opening for air escape.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic cross-sectional view of a speaker structure according to a first embodiment of the present invention. Here, 10 is a hollow and cylindrical speaker box, and 20 and 30 are speakers. The speaker 20 includes a cone 21 that constitutes a diaphragm, a frame 22 that fixes the outer periphery of the cone 22, a voice coil 23 that vibrates the cone, a magnetic circuit 24, a terminal 28, and the like. It consists of a magnet 26, a yoke 27, and the like. Similarly, the speaker 30 includes a cone 31, a frame 32, a voice coil 32, a magnetic circuit 34, a terminal 38, and the like. The magnetic circuit 34 includes a plate 35, a magnet 36, a yoke 37, and the like. Here, it is preferable that the speakers 20 and 30 have exactly the same configuration and shape, but it is sufficient if they have at least a cone having the same diameter and a magnetic circuit having the same shape.

  The ribs 50 are symmetrically fixed to the same positions of the yoke 27 of the speaker 20 and the yoke 37 of the speaker 30. The rib 50 is fixed to each yoke in FIG. 1, but it may be fixed to somewhere in the magnetic circuit. In this manner, the speaker 20 and the speaker 30 are connected to each other by the rib 50. The rib 50 is made of a columnar metal or the like, but it is preferable not to make the cross-sectional area constant along the longitudinal direction so that the rib 50 itself does not resonate. That is, it is preferable to make a so-called barrel shape in which the cross-sectional area of both ends connected to the yoke 27 and the yoke 37 is small and the cross-sectional area of the central portion of the rib 50 is large.

  Guide portions 29 are provided on the back sides of the outer peripheral portions of the frames 22 and 32 of the respective speakers so that the entire end portions on both sides of the speaker box 10 can be engaged and positioned just via the cushioning material 42. It is configured. The buffer material 42 is disposed between the speakers 20 and 30 and the speaker box 10 to maintain the airtightness in the speaker box 10 and is in a floating state without fixing the speakers 20 and 30 to the speaker box 10. keeping. Thus, since the speakers 20 and 30 are held in a floating state with respect to the speaker box 10, the vibrations of the speakers 20 and 30 are not directly transmitted to the speaker box 10.

  The buffer material 42 may be any material that has cushioning properties, maintains airtightness, and does not transmit the vibrations of the speakers 20 and 30 to the speaker box 10 as they are. The buffer material 42 is preferably made of a material that attenuates the signal by 6 dB or more in the reproduction band of the speakers 20 and 30. An example of such a material is a PEF material.

  A signal such as an audio signal is supplied to each speaker via the input terminal 40, the connection line 41, and the terminals 28 and 38. Here, it is preferable that the signals supplied to the respective speakers are signals having the same phase and the same sound is simultaneously generated from the respective speakers. Thus, by supplying the same in-phase signal to each speaker, the reaction due to the vibration of the yoke of each speaker is canceled through the rib 50.

  As described above, since the two speakers are arranged back to back via the ribs, it is possible to efficiently suppress the vibration of the yoke and increase the acoustic conversion efficiency of the cone. In addition, since each speaker is held in a floating state with respect to the speaker box, it is difficult for the vibration of the yoke to be transmitted to the speaker box, making it possible to reduce the sound of the speaker box and reducing noise components generated from the speaker. It is possible to do.

  Note that if two speakers are connected directly back to back without using ribs, the volume inside the speaker box, especially the volume behind each cone, cannot be taken sufficiently, so that good sound is produced from the speakers. Inconvenience, and the design freedom is reduced. Therefore, it is important that the two speakers are fixed to each other with a gap therebetween via a fixing member such as a rib.

  FIG. 2 shows an example of a speaker device in which four sets of speaker structures according to the first embodiment described above are arranged in one box-like speaker box 11. Here, speakers 20a, 20b, 20c and 20d are arranged on the front side of the figure, and speakers 30a, 30b, 30c and 30d are arranged on the rear side of the figure corresponding to each. Each speaker shown in FIG. 2 is a small speaker and has a cone diameter of about 10 to 40 cm.

  As described above, by mounting a plurality of sets of two speakers each having a magnetic circuit fixed by a rib in one speaker box, the reproduction volume of the bass can be increased while taking advantage of the low distortion characteristics of a small speaker. Is possible.

FIG. 3 is a schematic cross-sectional view of a speaker structure according to the second embodiment of the present invention.
The second embodiment is a modification of the above-described first embodiment, and only the shape of the speaker box that covers the two speakers 20 and 30 is different from the first embodiment. Here, the speaker box includes a hollow cylindrical main body portion 12a similar to the speaker box 10 shown in FIG. 1, and a hollow cylindrical protruding portion 12b protruding upward from the main body portion 12a. . The upper end of the protruding portion 12b is open and plays the role of air escape.

The diameters of the cones 21 and 31 of the speakers 20 and 30 are indicated by A, the length of the main body portion 12a is B, the diameter of the protruding portion 12b is C, and the length is D. For example, when A = 12 cm and B = 20 cm, it is preferable that C = 12 cm and D = 100 cm.
As described above, since the end portion of the protruding portion 12b is opened, the low frequency reproducibility capability of the speaker can be improved by the effect of lowering the resonance frequency by the open portion.

FIG. 4 is a schematic cross-sectional view of a speaker structure according to the third embodiment of the present invention.
Here, 13 is a hollow and cylindrical speaker box, and 20 and 30 are the same speakers as those described in the first embodiment.
One end of the rib 51 is fixed to the yoke 27 of the speaker 20. The other end of the rib 51 is threaded so that it can be fixed by being screwed into the connecting member 54. Similarly, one end of the rib 52 is fixed to the yoke 37 of the speaker 30, and the other end is threaded so that it can be fixed by screwing into the connecting member 54.

  In FIG. 4, one end of each of the ribs 51 and 52 is fixed to each yoke, but it may be fixed to somewhere in the magnetic circuit 24 or 34. Thus, the speaker 20 and the speaker 30 are connected to each other by the rib 51, the rib 52, and the connecting member 54. The ribs 51 and 52 are made of columnar metal or the like, but it is preferable not to make the cross-sectional area constant along the longitudinal direction so that the ribs themselves do not resonate. The connecting member 54 is fixed to the stand 60. Further, it is desirable that the ribs 51 and 52 be attached at the same position in the central portion of the magnetic circuits 24 and 34 of both speakers. By doing so, it becomes possible to attenuate the resonance and resonance of the ribs 51 and 52.

  FIG. 5 is a plan view when only the speaker box 13 is viewed from below. 5 is attached to the lower side of the drawing and the speaker 30 is attached to the upper side of the drawing. An opening 15 for the stand 60 is provided in the lower part of the speaker box, and opening / closing doors 14a and 14b are provided in the periphery of the opening. The open / close doors 14a and 14b are attached to the speaker box 13 by hinges or the like so that they can be opened and closed to the left and right sides of the drawing in FIG. By opening the open / close doors 14a and 14b, it is possible to easily perform the work of attaching the stand 60 to the connection member 54, the wiring work in the speaker box 13 and the like using the generated space.

  All end portions on both sides of the speaker box 13 are positioned through the frames 22 and 32 of the respective speakers and the buffer material 42. Further, a cushioning material 42 is also disposed between the open / close doors 14 a and 14 b of the speaker box 13 and the stand 60. These buffer materials 42 maintain airtightness in the speaker box 10 and hold the speaker box 13 in a floating state with respect to the speakers 20 and 30 and the stand 60. Thus, since the speaker box 13 is held in a floating state with respect to the speakers 20 and 30, the vibration of the speakers 20 and 30 is not directly transmitted to the speaker box 13. The material and the like of the buffer material 42 are the same as those in the first embodiment described above.

  Further, an intermediate support 70 is provided in the speaker box 13 in order to stabilize the rib 51. The intermediate support body 70 includes a ring-shaped member 71, a pedestal 72 fixed to the rib 51, a support column 73 that fixes the ring-shaped member 71 and the pedestal 72, and a cushioning material 74. Here, the intermediate support body 70 is in contact with the inner wall of the speaker box 13 via the buffer material 74. FIG. 6 is a perspective view showing the inside of the speaker box. It can be understood from FIG. 6 that the intermediate support 70 is fixed to the rib 51. Thereby, the positional relationship between the rib 51 and the speaker box 13 can be maintained constant, and the rib 51 can be stabilized. A suitable material for the buffer material 74 is felt or the like. Further, it is preferable to wind a sound absorbing material such as glass fiber around the support 73. Further, in FIG. 4, the intermediate support 70 is fixed only to the rib 51, but the same intermediate support can be provided to the rib 52.

  Signals such as audio signals are not shown in FIG. 4, but are supplied to each speaker via input terminals, connection lines, terminals, and the like, as in the first embodiment. In addition, the supplied signal is preferably a signal having the same in-phase signal and generating the same sound from each speaker at the same time as in the first embodiment. Thus, by supplying the same in-phase signal to each speaker, the reaction caused by the vibration of the cone of each speaker is canceled through the rib 51, the rib 52, and the connecting member 54.

  Next, an example of a method for assembling the speaker structure according to the fourth embodiment will be described. First, the rib 51 fixed to the speaker 20 is screwed into the connection member 54 and fixed. Next, one end of the speaker box 13 is engaged with the guide portion 29 of the speaker 20 via the buffer material 42. Next, the speaker 30 and the rib 52 fixed thereto are inserted from the other end side of the speaker box 13 so that the rib 52 can be screwed into the connecting member 54. The rib 52 is screwed and fixed to the connecting member 54 so that the other end of the speaker box 13 is engaged with the guide portion 39 of the speaker 30 via the buffer material 42. Accordingly, the speakers 20 and 30 are fixed by the ribs 51, the ribs 52, and the connection members 54, and the speaker box 13 is positioned so as to be sandwiched between the guide portions of the speakers 20 and 30.

  Next, the open / close doors 14 a and 14 b of the speaker box 13 are opened, the stand 60 is inserted using the opened space, and the connection member 54 is fixed to the stand 60. Furthermore, predetermined wiring to each speaker is performed. Finally, the opening / closing doors 14a and 14b are closed by providing the cushioning material 42 between the opening / closing doors 14a and 14b and the stand 60. In this manner, the speaker structure according to the fourth embodiment can be assembled.

(The invention's effect)
As described above, since the two speakers are fixed to each other via a fixing member such as a rib, it is possible to efficiently suppress the vibration of the yoke and increase the acoustic conversion efficiency of the cone.
In addition, when the same signal is supplied to the two speakers in the same phase, both yokes of each speaker are pressed and attracted via the ribs, so that the yoke vibration can be more efficiently suppressed. Become.

Further, when the speaker box is held in a floating state with respect to each speaker, the vibration of the yoke becomes difficult to be transmitted to the speaker box, and it is possible to reduce the sound of the speaker box and to reduce the noise component generated from the speaker. It is possible to reduce.
Furthermore, since the speaker box 13 is assembled while pulling both speakers with the connecting member 54, it is possible to make the structure more stable against vibrations during transportation of the speaker structure.

It is a figure which shows the outline of the speaker structure in connection with the 1st Embodiment of this invention. It is a figure which shows the speaker apparatus which has arrange | positioned multiple sets of the speaker structure shown in FIG. 1 in one speaker box. It is a figure which shows the outline of the speaker structure in connection with the 2nd Embodiment of this invention. It is a figure which shows the outline of the speaker structure in connection with the 3rd Embodiment of this invention. 3 is a plan view of the speaker box 13. FIG. It is a perspective view of the speaker structure shown in FIG. It is a figure which shows the conventional speaker structure.

Explanation of symbols

10, 11, 13 Speaker box 12a Speaker box main body 12b Speaker box protrusion 14a, 14b Open / close door 20, 30 Speaker 21, 31 Cone 22, 32 Frame 24, 34 Magnetic circuit 29, 39 Guide part 42, 74 Buffer 50 , 51, 52 Rib 54 Connection 60 Stand 70 Intermediate support

Claims (11)

A first diaphragm having a first magnetic circuit for converting a first diaphragm, a first frame for fixing an outer periphery of the first diaphragm, and a signal into vibration to the first diaphragm. Speakers,
A second diaphragm, a second frame for fixing an outer periphery of the second diaphragm, and a second magnetic circuit for converting a signal into vibration to the second diaphragm; Speakers,
A speaker structure comprising a fixing means for fixing the back surface of the first magnetic circuit and the back surface of the second magnetic circuit.   2. The speaker structure according to claim 1, further comprising means for supplying the same signal to the first magnetic circuit and the second magnetic circuit in the same phase. A speaker box for covering the first speaker and the second speaker and a supporting means for supporting the fixing member;
By disposing a cushioning material between the first and second frames and the speaker box, and between the support means and the speaker box,
The speaker structure according to claim 1, wherein the speaker box is maintained in a floating state with respect to the first and second speakers and the support means.   The speaker structure according to claim 3, further comprising a guide portion for engaging an end portion of the speaker box on the rear surfaces of the first and second frames.   The speaker structure according to claim 3, wherein the speaker box has an opening / closing mechanism capable of opening and closing a part thereof.   The fixing member includes a first rib fixed to the first magnetic circuit, a second rib fixed to the second magnetic circuit, and a connection for connecting the first and second ribs. The speaker structure according to claim 1, further comprising a member.   The speaker structure according to claim 3, further comprising an intermediate support that is fixed to the fixing member and contacts an inner surface of the speaker box.   The speaker structure according to claim 7, wherein the intermediate support body is in contact with an inner surface of the speaker box via a cushioning material.   The speaker structure according to claim 7, wherein a sound absorbing material is attached to the intermediate support.   The speaker structure according to claim 3, wherein the speaker box has an opening for venting air.   A speaker device comprising a plurality of sets of speaker structures according to claim 1 in one speaker box.

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