JP2006333511A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker having a small aperture and capable of reproducing low tone, having no distortion and being sound faithful to input signals. <P>SOLUTION: The speaker 30 installed in a speaker device 20 includes a cone-shaped diaphragm 42. One end of a cylindrical wall member 54 is fixed to the large-diameter side end part of the diaphragm 42. The inner wall of the wall member 54 is formed to be parallel with the vibrating direction of the diaphragm 42. When a voice signal is input into a voice coil 52, the diaphragm 42 is vibrated, together with the wall member 54, in a direction approximately orthogonal to one face 22a of a cabinet 22. Accordingly, since the air at the front of the diaphragm 42 is compressed and the compressed air is released, the impact thereof is propagated and detected as sound. Here, the compressed air is prevented from flowing out from the front to the side of the diaphragm 42 by the wall member 54. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a speaker, and more particularly to a speaker that emits sound waves by vibrating a diaphragm, such as a dynamic speaker or an electromagnetic speaker using a voice coil.

  FIG. 10 is a perspective view showing an example of a conventional speaker device. The speaker device 1 includes a cabinet 2. A low-pitched speaker 3, a high-pitched speaker 4, a mid-range speaker 5 and the like are attached to the front plate of the cabinet 2. When the diaphragms of the speakers 3, 4 and 5 vibrate, sound waves are radiated in the respective frequency regions.

  For example, the bass speaker 3 includes a cone-shaped diaphragm 6 that is reciprocally vibrated by a voice coil (not shown) as shown in FIG. An inner bottom portion of the diaphragm 6 is connected to the frame 8 via the damper 7, and an end portion on the large diameter side of the diaphragm 6 is connected to the frame 8 via the cone edge 9. A duct 10 is formed inward from the front plate of the cabinet 2, and the bass speaker 3 is attached to the duct 10 inside the cabinet 2 (see Patent Document 1).

  In such a speaker device 1, when the diaphragm 6 of the bass speaker 3 vibrates, the air in the duct 10 also vibrates, the duct 10 resonates, and is compensated by the resonance of the duct 10 from the opening of the duct 10. The bass is played.

  Other conventional speakers include those listed in Patent Documents 2 to 5.

JP 2002-232984 A JP-A-9-163490 Microfilm of utility model registration application No. 169774 in 1981 (Japanese Utility Model Publication No. 58-73694) JP 2001-95079 A Microfilm of utility model registration application No. 136658 in 1987 (Japanese Utility Model Publication No. 64-40994)

  However, such a conventional speaker has a problem that the sound is distorted because it has a large diameter in order to reproduce bass and uses resonance by a duct.

  Therefore, a main object of the present invention is to provide a speaker capable of reproducing a bass having a small diameter and without distortion.

The present invention provides a diaphragm that radiates sound waves in the vibration direction by vibrating in a direction intersecting the surface, and a frame shape so as to surround the sound wave radiation side of the diaphragm on the sound wave radiation side of the diaphragm. The speaker includes a wall member to be arranged, the wall member and the diaphragm are fixed, and the wall member vibrates together with the vibration of the diaphragm.
In such a speaker, the inner wall surface of the wall member is preferably configured to be substantially parallel to the vibration direction of the diaphragm.
Further, the wall member may have a cross section having substantially the same shape as the outer periphery of the sound wave emitting surface of the diaphragm.
A plurality of wall members may be arranged concentrically with the center of the diaphragm as a reference.
Furthermore, the height of the wall surface of the wall member is preferably configured to be approximately the same as the maximum amplitude of the diaphragm.
The present invention also includes a diaphragm that emits a sound wave in the vibration direction by vibrating in a direction intersecting the plane, and a parallel connection on the sound wave radiation side of the diaphragm. A speaker comprising a plurality of cylindrical bodies having an inner wall surface parallel to a vibration direction, wherein the cylindrical body and the diaphragm are fixed, and the cylindrical body vibrates together with the vibration of the diaphragm. .
In such a speaker, the height of the cylindrical body is preferably configured to be approximately the same as the maximum amplitude of the diaphragm.

As the principle of sound generation (generation), the present inventor does not directly convert the vibration of the diaphragm into sound waves, but compresses the air on the sound wave radiation surface of the diaphragm for a moment by the vibration of the diaphragm and immediately after that. It was found that the shock generated by the air being released at once, that is, expanding (exploding), propagates and is sensed as sound. Therefore, the present invention includes a wall member fixed to the diaphragm so as to be disposed in a frame shape so as to surround the sound wave radiation side of the diaphragm on the sound wave radiation side of the diaphragm, By using the speaker configured to vibrate, it is possible to prevent the air compressed by the vibration of the diaphragm from flowing out so as to leak sideways from the sound wave radiation surface (front surface) of the diaphragm. As a result, air having a compressibility corresponding to the vibration amount (amplitude) of the diaphragm is efficiently opened to the sound wave emitting surface side (front), and even a diaphragm having a small diameter can efficiently emit low sounds. it can. In addition, not only low sounds but also medium and high sounds are efficiently radiated. Since the wall member is not for resonance, it does not require a long distance like a resonance duct, and may have the same amplitude as the maximum amplitude of the diaphragm. Does not occur, and high sound quality faithful to the playback sound source can be obtained.
Thus, a wall member that vibrates with the diaphragm is formed on the sound wave radiation side of the diaphragm so that the air compressed by the diaphragm does not flow laterally from the sound wave radiation surface of the diaphragm.
In addition, the wall member is preferably formed in a frame shape so as to surround the sound wave emitting surface of the diaphragm so that the air captured by the sound wave emitting surface of the diaphragm does not flow out.
In particular, by using a wall member having a cross section substantially the same shape as the outer periphery of the sound wave emitting surface of the diaphragm, air on the entire surface of the sound wave emitting surface of the diaphragm can be captured.
Furthermore, not only the outer peripheral portion of the diaphragm but also the inner portion thereof may be divided into a plurality of sections by a wall member. For example, wall members having a cross section similar to the outer periphery of the diaphragm can be arranged concentrically with the center of the diaphragm as a reference.
Thus, by dividing the sound wave radiation side of the diaphragm into a plurality of sections, the area of the part surrounded by the wall member is reduced, and air is captured without flowing inside the wall member, so that more accurate sound can be obtained. Can be played. Furthermore, since the wall member exhibits the effect as a rib, the rigidity of the diaphragm is increased, and deformation such as undulation of the diaphragm can be prevented, so that accurate sound reproduction is possible.
In such a speaker, it is preferable that the height of the wall member is formed to be approximately the same as the maximum amplitude of the diaphragm so that air compressed by vibration of the diaphragm does not escape from the sound wave radiation surface.
Furthermore, in order to divide the sound wave radiation side of the diaphragm into a plurality of sections, a wall member in which a plurality of cylindrical bodies such as a honeycomb shape are connected in parallel may be formed on the sound wave radiation surface of the diaphragm.
Also in such a speaker, it is preferable that the height of the cylindrical body is formed to be approximately the same as the maximum amplitude of the diaphragm so that the air compressed by the vibration of the diaphragm does not escape from the sound wave radiation surface. .

  According to the present invention, it is possible to reproduce a sound that is faithful to the input signal over the entire range from the low range to the high range, and in particular, it is possible to obtain a speaker that can reproduce the low range even with a small diameter.

  The above object, other objects, features, and advantages of the present invention will become more apparent from the following description of the best mode for carrying out the invention with reference to the drawings.

  FIG. 1 is a perspective view showing an example of a speaker device using the speaker of the present invention. The speaker device 20 includes a cabinet 22. The cabinet 22 is formed in a rectangular parallelepiped box shape, for example, and a circular opening is formed on one surface 22a thereof.

  Inside the cabinet 22, as shown in FIG. 2, a speaker 30 is attached toward the opening. The speaker 30 has a permanent magnet 32, and one end of the permanent magnet 32 is attached to the bottom surface in the yoke 34. The yoke 34 is formed using a magnetic material so as to surround the permanent magnet 32. Further, a circular hole 36 is formed in the yoke 34 on the other end side of the permanent magnet 32. A cylindrical center pole 38 is attached to the other end of the permanent magnet 32, and the center pole 38 is formed to extend inside the hole 36 of the yoke 34. Thereby, an annular space is formed between the yoke 34 and the center pole 38 inside the hole 36. With such a structure, a magnetic field is applied to the annular gap between the yoke 34 and the center pole 38.

  A frame 40 that extends in a tapered shape is attached to the outside of the yoke 34 around the hole 36, and a diaphragm 42 is disposed inside the frame 40. The diaphragm 42 is formed in a cone shape with paper or the like, and an end portion on the small diameter side is inserted into a gap between the yoke 34 and the center pole 38. The end portion on the large diameter side of the diaphragm 42 is connected to a curved cone edge 44, and the end portion of the cone edge 44 is sandwiched and fixed between the end portion of the frame 40 and the arrow paper 46. Further, an intermediate portion outside the diaphragm 42 is connected to the frame 40 via a damper 48. Further, for example, a cap 50 having a shape of a part of a spherical surface is attached so as to cover the penetrating portion at the center of the diaphragm 42.

  In addition, the voice coil 52 is fixed to the diaphragm 42 in the gap portion between the yoke 34 and the center pole 38. When a voice signal is input to the voice coil 52, the diaphragm 42 vibrates in a direction orthogonal to a plane covering the large-diameter end connected to the cone edge 44. Further, as shown in FIG. 3, a frame-like wall member 54 having the same cross-sectional shape as the outer peripheral portion of the diaphragm 42 is attached to the large diameter side end portion of the diaphragm 42, that is, the outer peripheral portion of the diaphragm 42. . Here, when a cone-shaped diaphragm 42 as shown in FIG. 3 is used, a cylindrical wall member 54 is attached.

  The wall member 54 is formed such that at least the inner wall surface is parallel to the vibration direction of the diaphragm 42. Further, the height of the wall member 54 from the diaphragm 42 is formed to be approximately the same as the maximum amplitude of the diaphragm 42. The material of the wall member 54 is preferably light and strong, and can be formed of the same material as the diaphragm 42. In addition, paper, resin, rubber, wood, metal, and the like are not particularly limited. One end of the cylindrical wall member 54 is fixed to the outer peripheral portion of the diaphragm 42. The outer peripheral portion of the frame 40 of the speaker 30 is attached to a portion where the opening of the one surface 22a of the cabinet 22 is formed.

  In the speaker device 20, when an audio signal is input to the voice coil 52, the diaphragm 42 vibrates in a direction intersecting the one surface 22 a of the cabinet 22, and sound waves are emitted in the vibration direction. At this time, as shown in FIG. 4, the diaphragm 42 moves together with the wall member 54 to the sound wave radiation side, that is, forward, so that the air on the front surface of the diaphragm 42 is compressed, and the compressed air is opened to the opening of the wall member 54. It is released from the part side and is perceived as a sound when the impact propagates. As described above, when the air is compressed by the vibration of the vibration plate 42, the wall member 54 is formed on the outer peripheral portion of the vibration plate 42, so that the compressed air is shown in FIG. Is prevented from flowing out from the front surface of the diaphragm 42 to the side. Therefore, the air on the front surface of the diaphragm 42 can be reliably captured and compressed, and the compressed air can be efficiently opened forward. Therefore, it is possible to reproduce a sound faithful to the input signal from the low sound range to the high sound range, and in particular, it is possible to obtain a speaker that can reproduce the low sound range even with a small diameter.

  On the other hand, when the wall member is not formed on the outer peripheral portion of the vibration plate 42, the air pushed by the vibration of the vibration plate 42 is moved from the front surface of the vibration plate 42 to the side as shown by the solid line arrow in FIG. It will leak out. For this reason, the air in front of the diaphragm 42 cannot be efficiently compressed, and if a low sound is to be reproduced, it is necessary to use a large-diameter diaphragm 42 with a long air outflow distance, which is faithful to the input signal. I can't expect a good sound.

  In the conventional speaker device 1 shown in FIG. 11, the duct 10 is formed in front of the bass speaker 3, but the diaphragm 6 and the duct 10 of the bass speaker 3 are not fixed, and the diaphragm 6 Since air flows out from the gap with the duct 10, it is not possible to obtain the effect of the speaker 30 using the diaphragm 42 provided with the wall member 54. Further, the duct 10 is used for resonance for obtaining a low tone, and there is a problem that distortion occurs in the sound due to resonance. However, in the speaker 30 of the present invention, the height of the wall member 54 is approximately the same as the maximum amplitude of the diaphragm 42, and resonance does not occur, and sound without distortion can be obtained. Even if the height of the wall member 54 is equal to or less than the maximum amplitude of the diaphragm 42, it is possible to obtain an effect of preventing the compressed air from flowing out. In order to capture, it is preferable that the height is approximately the same as the maximum amplitude of the diaphragm 42. Of course, in order to capture the air in front of the diaphragm 42, the wall member 54 may be formed so as to have a height equal to or greater than the maximum amplitude of the diaphragm 42 within a range that does not hinder the vibration of the diaphragm 42. .

  Further, as shown in FIGS. 6 and 7, a plurality of frame-like wall members 54 having a cross-sectional shape similar to the outer peripheral shape of the diaphragm 42 can be used to divide into a plurality of sections. These wall members 54 are arranged concentrically with the center of the diaphragm 42 as a reference. These wall members 54 are all formed so as to have the same height as the maximum amplitude of the diaphragm 42. If the wall member 54 having the same height as the maximum distance traveled by the diaphragm is formed, the air can be reliably captured by the vibration of the diaphragm 54, and the air can be compressed and released.

  If the diaphragm 42 having such a wall member 54 is used, the area surrounded by the wall member 54 is reduced as compared with the case where the wall member 54 is provided only on the outer peripheral portion of the diaphragm 42. Air trapped by the vibration of the plate 42 is less likely to flow. Therefore, the air in front of the diaphragm 42 can be compressed and released as it is, and a sound without distortion can be reproduced. Furthermore, the wall member 54 formed on the surface of the diaphragm 42 exhibits the effect as a rib, and the rigidity of the diaphragm 42 is increased. For this reason, deformation such as undulation of the diaphragm 42 is less likely to occur, and sound faithful to the sound source can be reproduced.

  Thus, in order to reduce the area of the part surrounded by the wall member 54 and to exhibit the effect as a rib, you may use the wall member 54 which connected the cylindrical body in parallel. As such a wall member 54, as shown in FIGS. 8 and 9, a honeycomb-like wall member 54 in which hexagonal tubes are connected in parallel can be used. The wall member 54 is also formed to have a height comparable to the maximum amplitude of the diaphragm 42. The wall member 54 is provided between the outer periphery of the diaphragm 42 and the outer periphery of the cap 50. Note that the shape of the cylindrical body is not limited to a hexagonal cylindrical shape, and may be other shapes such as a rectangular cylindrical shape or a cylindrical shape.

  Thus, by providing the wall member 54 on the diaphragm 42, the compression efficiency of air due to the vibration of the diaphragm 42 can be increased, and even the speaker 30 having the diaphragm 42 with a small diameter has no distortion. The bass can be played.

The wall member is preferably formed in the same shape as the outer periphery of the diaphragm. However, when the outer periphery of the diaphragm is a circle, the wall member may be formed in another shape such as a quadrangular shape. There is an effect.
In addition, the inner wall of the wall member is preferably parallel to the vibration direction of the diaphragm, but may be directed so as to intersect the vibration direction of the diaphragm, that is, slightly inward.

  The present invention can also be applied to a speaker using a diaphragm that asymptotically spreads in the sound wave radiation direction, such as a cone-shaped deformed morning glory, with respect to the cone-shaped diaphragm. In this case, a wall member is provided at the tip of the morning glory-like diaphragm, and the tip of the diaphragm is a surface substantially perpendicular to the vibration direction of the diaphragm, so that the wall member is substantially parallel to the vibration direction. By arrange | positioning, a wall member will be arrange | positioned substantially perpendicularly to the surface of the edge part of a diaphragm. In this case as well, the wall member may be disposed so as to be inclined slightly inside, that is, toward the center of the speaker so as to intersect the vibration direction.

  The present invention can be applied not only to a speaker having a cone-shaped diaphragm but also to a speaker having a flat diaphragm. Therefore, the wall member shown in FIGS. 8 and 9 is formed on the surface of the diaphragm around the cap. However, when a plate-shaped diaphragm is used, the wall member can be formed on the entire surface.

  Further, when a flat diaphragm is used, the planar shape thereof is not limited to a circle, but may be other shapes such as a quadrangle. Thus, when using a quadrangular diaphragm, the wall member formed in the outer peripheral part of a diaphragm is formed in a square cylinder shape according to the shape of a diaphragm. Further, when a similar rectangular cylindrical wall member is used, the wall members are concentrically arranged with the center of the diaphragm as a reference. As described above, when the wall member is provided on the outer peripheral portion of the diaphragm or when the wall member is provided concentrically, the wall member has the same shape as the outer peripheral shape of the diaphragm or a cross section similar thereto. It is formed in a cylindrical shape. Such a wall member is applicable to all speakers having a diaphragm that vibrates in a direction intersecting one plane.

It is a perspective view which shows an example of the speaker apparatus using the speaker of this invention. It is an illustration figure which shows the structure of the speaker apparatus shown in FIG. It is an illustration figure which shows the diaphragm and wall member of a speaker which are used for the speaker apparatus shown in FIG. It is an illustration figure which shows the relationship between the vibration of the diaphragm shown in FIG. 3, and compression of air. It is an illustration figure which shows the relationship between the vibration of the conventional diaphragm for comparing with this invention, and compression of air. It is an illustration figure which shows the other example of the diaphragm and wall member which are used for the speaker of this invention. It is an illustration figure which shows the structure of the speaker using the diaphragm and wall member which are shown in FIG. It is a top view which shows the other example of the wall member used for the speaker of this invention. It is an illustration figure which shows the diaphragm which attached the wall member shown in FIG. It is a perspective view which shows an example of the speaker apparatus using the conventional speaker. It is an illustration figure which shows an example of the conventional speaker used for FIG.

Explanation of symbols

20 Speaker device 30 Speaker 40 Frame 42 Diaphragm 44 Cone edge 50 Cap 54 Wall member

Claims (7)

A diaphragm that radiates sound waves in the vibration direction by vibrating in a direction intersecting the surface;
On the sound wave radiation side of the diaphragm, including a wall member arranged in a frame shape so as to surround the sound wave radiation side of the diaphragm,
The speaker is characterized in that the wall member and the diaphragm are fixed, and the wall member vibrates together with the vibration of the diaphragm.   The speaker according to claim 1, wherein an inner wall surface of the wall member is configured to be substantially parallel to a vibration direction of the diaphragm.   3. The speaker according to claim 1, wherein the wall member has a cross section having substantially the same shape as an outer periphery of a sound wave emitting surface of the diaphragm.   The speaker according to any one of claims 1 to 3, wherein a plurality of the wall members are concentrically arranged with respect to the center of the diaphragm.   The speaker according to any one of claims 1 to 4, wherein a height of the wall surface of the wall member is configured to be approximately the same as a maximum amplitude of the diaphragm. A diaphragm that radiates sound waves in the vibration direction by vibrating in a direction intersecting the surface;
A plurality of cylindrical bodies arranged in parallel and connected to the sound wave radiation side of the diaphragm, and having an inner wall surface parallel to the vibration direction of the diaphragm;
The tubular body and the diaphragm are fixed, and the tubular body vibrates with the vibration of the diaphragm.   The speaker according to claim 6, wherein a height of the cylindrical body is configured to be approximately equal to a maximum amplitude of the diaphragm.

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