JP2006303778A - Eccentric speaker apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an eccentric speaker apparatus including an eccentric main diaphragm that can improve disturbance in a frequency characteristic over a broadband even when a sub diaphragm is provided. <P>SOLUTION: The eccentric speaker apparatus 31 includes: the main diaphragm 1B that receives vibration from a voice coil 15 driven by a magnetic circuit 20 to reproduce sound and is deviated from the center of the voice coil 15; and the sub diaphragm 3B located at a position extended from the center part of the main diaphragm 1B in the radiation direction of the sound, reproducing the sound in a region for supplementing the main diaphragm 1B, and deviated from the center of the voice coil 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an eccentric speaker device having an eccentric diaphragm whose central axis is eccentric with respect to the center of a voice coil.

  With regard to the problem of deterioration of characteristics due to the division resonance of the diaphragm, the shape of the diaphragm has conventionally been made not to be coaxial with the voice coil, or the right cone was cut along an oblique plane that is not orthogonal to the axis. There has been proposed an eccentric speaker device equipped with a so-called eccentric diaphragm (eccentric cone). In the eccentric speaker device having such a feature, since the distance from the voice coil to the periphery of the diaphragm is non-uniform, the division resonance at the natural frequency does not occur and the degradation of the reproduction sound quality can be solved. (For example, refer to Patent Document 1).

  On the other hand, conventionally, a speaker device has been proposed in which a sub-diaphragm (sub-cone) is provided to increase the bandwidth. Among them, a full-band type speaker device called a so-called full-range speaker has many excellent points. In this all-band type speaker device, all sounds are radiated from the same sound source. Therefore, the fundamental sound and harmonics of the same sound or instrument sound are output separately from the speakers at different positions divided for each frequency. It is possible to completely eliminate the unnaturalness of coming in, the instability of sound field localization during stereo reproduction caused by the characteristics near the crossover frequency and the disturbance of the phase (see, for example, Patent Document 2).

JP 2000-354289 A JP 2001-346284 A

  However, in the above-described eccentric speaker device, when a secondary diaphragm is provided in order to increase the bandwidth, resonance may occur in the high frequency band reproduced by the secondary diaphragm and the frequency characteristics may be disturbed.

  The present invention has been made to solve the above-described problems. In an eccentric speaker device having a main diaphragm whose center axis is eccentric, resonance occurs in a high frequency band even when a sub diaphragm is provided. It is an object of the present invention to provide a speaker device that can improve the disturbance of frequency characteristics in a wide band.

  In order to solve the above-described problems and achieve the object, a speaker device according to the present invention reproduces sound by transmitting vibration from a voice coil driven by a magnetic circuit and is eccentric with respect to the center of the voice coil. The speaker device having the main diaphragm is provided extending in the sound radiation direction from the central portion of the main diaphragm, and reproduces the sound of the region supplementing the main diaphragm, and is eccentric with respect to the center of the voice coil. And a secondary diaphragm.

  Here, the main diaphragm that is eccentric with respect to the center of the voice coil means that the shape of the diaphragm is not coaxial with the voice coil, or the right cone is cut along an oblique plane that is not orthogonal to the axis. It refers to a so-called eccentric diaphragm that is shaped, and includes all diaphragms whose central axis is deviated from the center of a circle or ellipse formed by the outer peripheral edge of the diaphragm.

  Embodiments of a speaker device according to the present invention will be described in detail below. Note that the present invention is not limited to the embodiments. In the following, the outline and features of the speaker device of the present invention will be described as embodiments, and then examples relating to the speaker device will be described.

[Embodiment]
The eccentric speaker device according to the present embodiment includes a main diaphragm that is transmitted with vibration from a voice coil driven by a magnetic circuit to reproduce sound and is eccentric with respect to the center of the voice coil, and a central portion of the main diaphragm And a sub-diaphragm that is provided extending in the sound radiation direction, reproduces the sound in the region that supplements the main diaphragm, and is eccentric with respect to the center of the voice coil. Therefore, in an eccentric speaker device having a main diaphragm whose center axis is eccentric, even when a sub diaphragm is provided for the purpose of, for example, widening the band, both the main diaphragm and the sub diaphragm are in relation to the center axis. In addition to the resonance dispersion effect of the main diaphragm, the resonance dispersion effect in the high frequency region by the sub diaphragm is added, and the disturbance of the frequency characteristics can be improved in a wide band.

  In addition, the eccentric speaker device of the present embodiment further includes a center cap that is provided so as to close the hole in the center portion of the sub-diaphragm and reproduces the sound of the region that supplements the main diaphragm, so that further broadening of the band is achieved. In addition, since the center cap is also eccentric with respect to the center of the voice coil, a resonance dispersion effect in a higher frequency region can be added, and the disturbance of frequency characteristics can be further improved in a wide band. Moreover, since the main diaphragm and the sub diaphragm are eccentric so as to incline the directivity in the same direction, the directivity of the speaker device can be greatly inclined. Furthermore, the eccentric direction of the center cap may be made to coincide with the eccentric direction of the main diaphragm and the sub diaphragm, and the directivity may be further inclined. Thus, for example, when the speaker device is installed in the passenger compartment of the vehicle, when sound is radiated in a direction inclined with respect to the mounting surface of the speaker device, the sound is emitted in an acute angle with respect to the mounting surface. Can be radiated. On the contrary, the inclination of directivity can be reduced by making the directions of eccentricity different from each other.

  In addition, regarding the eccentricity of the main diaphragm and the sub-diaphragm, not only matching the directions as described above, but a combination of both eccentric vectors (the direction and magnitude of the eccentricity) has a desired direction and magnitude. It may be made to become. Thereby, the directivity of the speaker device can be controlled. Not only the main diaphragm and the sub diaphragm, but also a combination of the three eccentric vectors including the center cap may be in a desired direction and size. By adjusting the mutual eccentric vectors, the directivity direction can be set to an arbitrary direction. That is, the directivity direction can be freely controlled.

  In more detail, the three diaphragms of the main diaphragm, the sub diaphragm, and the center cap have different frequency bands of the sound to be reproduced, that is, the sub diaphragm has a higher frequency band than the main diaphragm. The center cap has a higher frequency band than the sub-diaphragm, so the frequency band of the sound to be reproduced is different, so the directivity of each frequency band can be controlled by adjusting the amount of eccentricity. it can.

Further, in the eccentric speaker device of the present embodiment, the auxiliary diaphragm and the center cap are integrally formed. Therefore, the timbre of the reproduced sound is unified, and the realistic sensation can be improved together with the improvement of the characteristic deterioration due to the division resonance.
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Example 1
FIG. 1 is a cross-sectional view of an eccentric speaker device having an eccentric main cone of Example 1, and an integrally formed eccentric sub-cone and a center cap provided in the eccentric speaker device. In FIG. 1, the cone type speaker device 31 of this embodiment includes a main cone 1B which is an eccentric main diaphragm, a sub cone 3B which is an eccentric sub diaphragm, a center cap 2A, a voice coil bobbin 17 and a voice coil 15. It has a structure and a magnetic circuit 20 comprising a yoke 13, a magnet 11, and a top plate 12.

  A top plate 12 and a yoke 13 made of a magnetic material such as iron are attached to the front side and the back side of the ring-shaped magnet 11. A center pole 14 integrated with the yoke 13 is disposed at the center of the front surface of the yoke 13. A magnetic gap g is formed between the outer peripheral surface of the center pole 14 and the inner peripheral surface of the top plate 12. That is, the magnet 11, the top plate 12, the yoke 13, and the center pole 14 constitute a magnetic circuit 20 that forms a magnetic gap g between the outer peripheral surface of the center pole 14 and the inner peripheral surface of the top plate 12. A frame 16 is attached to the front surface of the top plate 12.

  Further, on the opposite side of the magnet 11 that is in front of the top plate 12, a substantially eccentric trumpet main cone 1B that is the main diaphragm is arranged with the large diameter portion facing forward in the acoustic radiation direction (front). It is installed. The central axis of the main cone 1B is eccentric by a distance E with respect to the central axis O of the magnetic circuit 20 and the voice coil 15. A substantially eccentric trumpet-shaped sub-cone 3B is disposed with its large diameter portion facing forward so as to extend forward from the central hole of the main cone 1B. The sub cone 3B has a conical small diameter portion connected to the small diameter portion of the main cone 1B, and the opposite large diameter portion extends to an intermediate portion of the main cone 1B. The sub-cone 3B vibrates together with the main cone 1B to reproduce high-band sound that cannot be reproduced by the main cone 1B. The central axis of the sub-cone 3B is eccentric by a distance F with respect to the central axis O of the magnetic circuit 20 and the voice coil 15.

  A small-diameter dome-shaped center cap 2A is provided so as to close the hole at the center of the sub cone 3B. The sub-cone 3B and the center cap 2A are manufactured by being integrally molded with the same material of either paper or fiber. The center axis of the center cap 2A coincides with the center axis O. As with the sub cone 3B, the center cap 2A vibrates together with the main cone 1B to reproduce higher-band sounds that the main cone 1B and the sub cone 3B cannot reproduce. The center cap 2A contributes to dustproofing the speaker device 31 and improving the rigidity of the central portion of the main cone 1B.

  Furthermore, a cylindrical voice coil bobbin 17 is arranged with the central axis of the main cone 1B and the center cap 2A aligned. The voice coil bobbin 17 is supported from the frame 16 by a spider 18 having elasticity, and can move forward and backward along the central axis. A center cap 2A molded integrally with the sub-cone 3B is supported by connecting a circular peripheral edge to the voice coil bobbin 17. The main cone 1B is supported by fixing the circular peripheral edge portion of the conical large diameter portion to the outer peripheral edge portion of the frame 16, and connecting the conical small diameter portion to the sub cone 3B.

  A voice coil 15 is wound around the outer peripheral surface of the voice coil bobbin 17. The voice coil bobbin 17 is disposed so that the voice coil 15 is located at a predetermined position in the gap g.

  In the eccentric speaker device 31 having such a configuration, the sub cone 3B is eccentric by the distance F with respect to the central axis O. With this configuration, in the eccentric speaker device having the main cone 1B whose center axis is eccentric, even when the sub cone 3B is provided for the purpose of, for example, widening the band, resonance does not occur in the high frequency band. In addition to the resonance dispersion effect of the main cone 1B, the resonance dispersion effect in the high frequency region by the sub cone 3B is also added, and the disturbance of the frequency characteristics can be improved in a wide band.

  Since the main cone 1B and the sub cone 3B are eccentric, the directivity direction of the eccentric speaker device 31 can be greatly inclined. Contrary to the present embodiment, the inclination of directivity can be reduced by making the eccentric directions of the main cone 1B and the sub cone 3B different from each other. Further, the inclination can be eliminated by adjusting each other. Furthermore, by adjusting the mutual eccentric vector (the direction and magnitude of the eccentricity) of the main cone 1B and the sub cone 3B, the directing direction can be directed to an arbitrary direction. That is, the directivity direction can be freely controlled. Since the sub-cone 3B and the center cap 2A are integrally formed, the timbre of the reproduced sound is unified, and the sense of reality can be improved together with the improvement of the characteristic deterioration due to the division resonance.

(Example 2)
FIG. 2 is a cross-sectional view of an eccentric speaker device having an eccentric main cone according to the second embodiment and an integrally formed eccentric sub-cone and an eccentric center cap provided in the eccentric speaker device. In FIG. 2, in the eccentric speaker device 32 of the present embodiment, the central axis of the main cone 1 </ b> B is eccentric by a distance E with respect to the central axis O of the magnetic circuit 20 and the voice coil 15. The center axis of the sub-cone 3B is eccentric by the distance F with respect to the center axis O. The center axis of the center cap 2B is eccentric with respect to the center axis O by a distance D. The sub-cone 3B and the center cap 2B are manufactured by being integrally molded from the same material.

  In the eccentric speaker device 32 of the present embodiment, since the main cone 1B, the sub cone 3B, and the center cap 2B are all eccentric, deterioration of characteristics due to split resonance can be further reduced.

  Further, in the eccentric speaker device 32 of the present embodiment, the main cone 1B, the sub cone 3B, and the center cap 2B are all eccentric so that the directivity is inclined in the same direction, so that the directivity direction of the speaker device 36 is greatly inclined. Can do. In contrast to the present embodiment, the inclination of directivity can be reduced by making the eccentric directions of the main cone 1B, the sub cone 3B, and the center cap 2B different from each other. Further, the inclination can be eliminated by adjusting the mutual eccentricity. Furthermore, by adjusting the mutual eccentric vectors of the main cone 1B, the sub cone 3B, and the center cap 2B, the directing direction can be set to an arbitrary direction. That is, the directivity direction can be freely controlled.

  In more detail, the three diaphragms of the main cone 1B, the sub cone 3B, and the center cap 2B have different frequency bands of sound to be reproduced, that is, the sub cone 3B has a higher frequency band region than the main cone 1B. Since the center cap 2B has a higher frequency band than the sub-cone 3B, the frequency band of the sound to be reproduced is different, and the directivity of each frequency band is controlled by adjusting the amount of eccentricity. You can also.

  In addition, although the shape of the center cap 2B of a present Example is a convex shape with respect to the acoustic radiation direction, even if it is a concave shape with respect to the acoustic radiation direction, substantially the same effect can be obtained. Can do.

Example 4
FIG. 3 is a cross-sectional view of the eccentric speaker device having the eccentric main cone of the third embodiment. In the eccentric speaker device 34 of the present embodiment, a center cap is not provided as compared with that of the first embodiment. Other points are the same as those of the first embodiment. For this reason, there is no acoustic band to be reproduced by the center cap. Except for this point, the same effect as that of the first embodiment can be obtained.

Example 4
FIG. 4 is a cross-sectional view of an eccentric speaker device having a bent eccentric main cone of Example 4, and an integrally formed eccentric sub-cone and a center cap provided in the eccentric speaker device. The main cones of Examples 1 to 3 described above were all substantially trumpet-shaped diaphragms. However, as in this example, the main cone has a shape in which a trumpet-shaped cone is bent in the middle of the radial direction. Even if it is a thing, the same effect can be acquired.

  In FIG. 4, in the eccentric speaker device 34 of the present embodiment, the central axis of the main cone 4 </ b> B is eccentric by a distance E with respect to the central axis O of the magnetic circuit 20 and the voice coil 15. The center axis of the sub-cone 3B is eccentric by the distance F with respect to the center axis O. The sub cone 3B and the center cap 2A are manufactured by being integrally molded.

  In this embodiment, the main cone 4B and the sub cone 3B are eccentric so that the directivity is inclined in the same direction. With this configuration, it is possible to obtain substantially the same effect as in the first embodiment.

(Example 5)
FIG. 5 is a cross-sectional view of an eccentric speaker device having a bent eccentric main cone of Example 5, and an integrally formed eccentric sub-cone and an eccentric center cap provided in the eccentric speaker device. In FIG. 5, in the eccentric speaker device 35 of the present embodiment, the central axis of the main cone 4 </ b> B is eccentric by a distance E with respect to the central axis O of the magnetic circuit 20 and the voice coil 15. The center axis of the sub-cone 3B is eccentric by the distance F with respect to the center axis O. The center axis of the center cap 2B is eccentric with respect to the center axis O by a distance D. The sub-cone 3B and the center cap 2B are integrally molded.

  Furthermore, in the speaker device 35 of the present embodiment, the main cone 4B, the sub cone 3B, and the center cap 2B are all eccentric so that the directivity is inclined in the same direction, so that the directivity direction of the speaker device 35 can be greatly inclined. it can. Contrary to the present embodiment, the inclination of directivity can be reduced by making the eccentric directions of the main cone 4B, the sub cone 3B and the center cap 2B different from each other. Further, the inclination can be eliminated by adjusting the mutual eccentricity. Furthermore, by adjusting the mutual eccentric vectors of the main cone 4B, the sub cone 3B, and the center cap 2B, the directing direction can be set to an arbitrary direction. That is, the directivity direction can be freely controlled.

  In addition, although the shape of the center cap 2B of a present Example is a convex shape with respect to the acoustic radiation direction, even if it is a concave shape with respect to the acoustic radiation direction, substantially the same effect can be obtained. Can do.

(Example 6)
FIG. 6 is a cross-sectional view of an eccentric speaker device having a bent eccentric main cone according to the sixth embodiment. In the eccentric speaker device 36 of the present embodiment, a center cap is not provided as compared with that of the fourth embodiment. The other points are the same as those of the fourth embodiment. For this reason, there is no acoustic band to be reproduced by the center cap. However, except for this point, the same effects as those of the fourth embodiment can be obtained.

  By providing an eccentric diaphragm whose central axis is eccentric with respect to the center of the voice coil, it is suitable for application to a speaker device that suppresses frequency characteristic degradation due to split resonance and controls directivity. The present invention is particularly suitable when applied to a vehicle-mounted speaker device installed in a vehicle cabin.

1 is a cross-sectional view of an eccentric speaker device having an eccentric main cone of Example 1, and an integrally formed eccentric sub-cone and a center cap that are provided in the eccentric speaker device. It is a cross-sectional view of an eccentric speaker device having an eccentric main cone of Example 2, and an eccentric sub-cone and an eccentric center cap that are integrally formed in the eccentric speaker device. It is a cross-sectional view of an eccentric speaker device having an eccentric main cone of Example 3. It is a cross-sectional view of an eccentric speaker device having a bent eccentric main cone of Example 4, and an integrally formed eccentric sub-cone and a center cap provided in the eccentric speaker device. It is a cross-sectional view of an eccentric speaker device having a bent eccentric main cone of Example 5, and an integrally formed eccentric sub-cone and an eccentric center cap provided in the eccentric speaker device. FIG. 9 is a cross-sectional view of an eccentric speaker device having a bent eccentric main cone of Example 6.

Explanation of symbols

1B Eccentric main cone (main diaphragm)
2A Center cap not eccentric 2B Eccentric center cap 3B Eccentric sub cone (sub diaphragm)
4B Eccentric bent main cone (main diaphragm)
11 Magnet 12 Top Top Plate 13 Yoke 14 Center Pole 15 Voice Coil 16 Frame 17 Voice Coil Bobbin 18 Spider O Center Axis of Magnetic Circuit and Voice Coil g Magnetic Gap

Claims (6)

In an eccentric speaker device having a main diaphragm that is transmitted with vibration from a voice coil driven by a magnetic circuit to reproduce sound and is eccentric with respect to the center of the voice coil,
A sub-diaphragm that extends from the central portion of the main diaphragm in the sound radiation direction, reproduces the sound in a region that supplements the main diaphragm, and is eccentric with respect to the center of the voice coil; An eccentric speaker device characterized by comprising: The eccentric speaker device according to claim 1, further comprising a center cap that is provided so as to close a hole in a central portion of the sub-diaphragm and reproduces sound in a region that supplements the main diaphragm. The eccentric speaker device according to claim 2, wherein the center cap is eccentric with respect to a center of the voice coil. The eccentric speaker device according to any one of claims 1 to 3, wherein at least the main diaphragm and the sub diaphragm are eccentric so as to incline directivity in the same direction. The eccentricity of at least the main diaphragm and the sub-diaphragm is such that a combination of the eccentric vectors of the two has a desired direction and size. The eccentric speaker device according to the item. The eccentric speaker device according to any one of claims 1 to 5, wherein the auxiliary diaphragm and the center cap are integrally formed.

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