JP2006041676A - Loudspeaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a "loudspeaker" with a plurality of dampers which are shaped to relax rolling of a voice coil bobbin and reduce a drive load of a diaphragm. <P>SOLUTION: A plurality of the dampers 3a, 3b provided between a frame 1 and the diaphragm 2 gradually approach each other toward the diaphragm 2 and are located at the same span, so that the rectilinearity of the bobbin 7 in a vibrating direction is enhanced, the rolling is eliminated, and the load due to expansion/contraction of the dampers 3a, 3b is reduced to enhance the sensitivity of the loudspeaker thereby establishing the compatibility between the improvement of sound quality and a high output at a low sound frequency band. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a speaker in which a diaphragm is elastically supported by a plurality of dampers, and more particularly to a speaker capable of stably supporting a diaphragm with the damper and ensuring a large operation amplitude of the diaphragm.

  A typical speaker has a frame, a diaphragm, a damper, and a magnetic drive unit. The magnetic drive unit includes a magnetic circuit unit having a magnet, a coil (voice coil), and a bobbin around which the coil is wound.

  The speaker described in Patent Document 1 below is provided with a cone-shaped (conical) diaphragm having a hole in the center. The outer peripheral side of the diaphragm is supported by a frame, and a position close to the center of the diaphragm is supported by a single damper. This damper is annular, corrugated, and stretchable. The inner peripheral side of the damper is supported by a magnetic circuit portion provided on the frame side, and the outer peripheral side of the damper is connected to the diaphragm, so that the diaphragm can vibrate in the sound generation direction.

  In addition, a coil wound around a bobbin is provided at the center of the diaphragm, and the magnetic circuit unit generates a magnetic field across the coil.

  In the speaker described in Patent Document 1, since the diaphragm is supported by a single damper, a rolling operation that is inclined with respect to the sound generation direction is likely to occur. When this rolling operation occurs, the bobbin is tilted together with the diaphragm, and the coil wound around the bobbin may come into contact with the magnetic circuit unit to generate an impact sound or chatter sound.

  Therefore, in the speakers described in Patent Document 2 and Patent Document 3, the diaphragm is supported by two dampers spaced apart in the vibration direction.

  In the speaker described in Patent Document 2, the outer periphery of a cone-shaped diaphragm is supported by a frame, and a bobbin having a coil is provided at the center of the diaphragm. The diaphragm is supported by a large-diameter damper and a small-diameter damper. The large-diameter damper has an outer periphery connected to the frame and an inner periphery connected to the bobbin. The small-diameter damper is provided in front of the large-diameter damper in the sound generation direction. The small-diameter damper has an outer peripheral side connected to the diaphragm and an inner peripheral side connected to a yoke constituting the magnetic circuit unit.

  In the speaker described in Patent Document 3, the outer periphery of a cone-shaped diaphragm is supported by a frame, and a bobbin is provided at the center. This speaker is provided with two dampers of the same size arranged at intervals in the sound generation direction. Each of the dampers is connected to the frame on the outer peripheral side and connected to the bobbin on the inner peripheral side.

As described in Patent Document 2 and Patent Document 3, when the diaphragm is supported by two dampers arranged at intervals on the sound generation side, the vibration becomes easier to move linearly in the sound generation direction. It becomes hard to produce operation.
Japanese Utility Model Publication No. 48-47330 Japanese Utility Model Publication No. 5-53397 Japanese Patent Laid-Open No. 2002-300695

  However, in the speaker described in Patent Document 2, the damper located in front of the sound generation side has a small diameter, so that the amount of deformation of the damper itself is small, and therefore the restraining force on the diaphragm is very large. Therefore, the operation amplitude of the diaphragm cannot be increased, and sound distortion tends to occur when the output is increased.

  On the other hand, in the speaker described in Patent Document 3, the two dampers have the same diameter and are arranged in parallel to each other. In order to prevent the rolling of the diaphragm, it is necessary to widen the distance between both dampers on the inner and outer peripheral sides of the damper, which increases the overall thickness of the speaker. In addition, since the diaphragm is restrained by two parallel dampers, it is difficult to operate the diaphragm with a large amplitude.

  An object of the present invention is to solve the above-described conventional problems, and to provide a speaker that can alleviate the rolling phenomenon of the diaphragm, reduce the restraint in the amplitude direction of the diaphragm, and can be made thinner. Yes.

The present invention relates to a speaker having a frame, a diaphragm whose outer peripheral portion is supported by the frame, and a magnetic drive unit that is provided between the diaphragm and the frame and drives the diaphragm.
A plurality of dampers are provided between the frame and the diaphragm so as to vibrate the diaphragm.
A first connecting portion that connects each of the dampers and the frame side is disposed at a predetermined interval in the vibration direction of the diaphragm, and a second that connects each of the dampers and the diaphragm side. The connecting portions are arranged at an interval narrower than the interval between the first connecting portions with respect to the vibration direction of the diaphragm.

  In the above configuration, the plurality of dampers are installed so as to approach each other from the first connecting portion on the frame side to the second connecting portion on the diaphragm side. Since the first connecting portions are arranged at intervals in the sound generation direction, the damper and the diaphragm are less likely to tilt, and the diaphragm is less likely to cause a rolling operation. In addition, since the two dampers both extend obliquely, the restraining force against the vibration in the sound generation direction of the diaphragm is weakened, and it is easy to suppress the distortion of sound at the time of high output.

  In the present invention, it is preferable that each of the second connecting portions is arranged without a gap in the vibration direction.

  In the above configuration, the diaphragm and the plurality of dampers are connected at one place or a place close to each other. For this reason, the freedom degree at the time of the vibration of the diaphragm increases, and it becomes possible to cope with a large output. In addition, the speaker can be made thinner.

  More preferably, each of the dampers has the same support span between the first connecting portion and the second connecting portion.

  In the above-described configuration, the plurality of dampers are connected to the diaphragm with the same expansion / contraction force, respectively, and when the amplitude direction of the diaphragm is directed to the front of the sound generation direction and to the rear. When it is, the restraining force on the diaphragm becomes uniform. Therefore, symmetry can be imparted to the vibration characteristics of the diaphragm.

  In the present invention, it is preferable that the second connecting portion is located on the outer peripheral side and the first connecting portion is located on the inner peripheral side.

  In this configuration, it is easy to secure a long support span of the damper, and it is easy to configure the entire speaker to be thin.

  In this case, the outer peripheral side of the diaphragm is supported by the frame via a deformable outer peripheral support plate, and the second connecting portion is positioned on the outer peripheral side of the diaphragm. Become.

  The magnetic drive unit includes a coil supported by a bobbin fixed to the diaphragm, and a magnetic circuit unit that is provided on the frame side and applies a magnetic field to the coil. The connecting portion can be configured as being located around the magnetic circuit portion.

  In the present invention, the plurality of dampers provided between the frame and the diaphragm are arranged so as to approach each other as they reach the diaphragm side. It is easy to suppress the rolling phenomenon. Moreover, the restraining force with respect to the diaphragm by the damper can be reduced, and the distortion of sound is easily suppressed. Furthermore, the entire speaker can be easily made thin.

  FIG. 1 is a sectional view showing a speaker according to a first embodiment of the present invention, and FIG. 2 is a partially enlarged sectional view showing a speaker according to a second embodiment of the present invention.

  The speaker shown in FIG. 1 is mainly composed of each element of a frame 1, a diaphragm 2, a magnetic drive unit 6, and dampers 3a and 3b.

  The frame 1 is die-cast with a nonmagnetic metal material such as an aluminum alloy, or is injection-molded with a synthetic resin. The frame 1 has a cup-shaped storage portion 1A and a flange 1B located on the outer peripheral edge of the storage portion 1A. A mounting hole (not shown) for mounting on a mounting base material (not shown) such as a baffle plate is formed in the flange 1B. In FIG. 1, a center line extending in the front-rear direction (sound generation direction) of the speaker is indicated by OO, and a support reference plane by the dampers 3a and 3b is indicated by II. This support reference plane II coincides with a plane obtained by dividing the thickness of the flange 1B of the frame 1 in the front-rear direction by two. Note that, with the support reference plane II as a boundary, the speaker's sounding side (upper side in FIG. 1) is the front, and the opposite side is the rear.

  A fixed portion 1a having a ring-like wall shape is integrally formed at the center portion inside the storage portion 1A, and is positioned in front of the bottom surface 1e of the storage portion 1A inside the fixed portion 1a. A central bottom 1d is formed. A mounting surface 1b, which is a ring-shaped plane located slightly behind the support reference surface II, is formed on the entire inner periphery of the flange 1B.

  The magnetic drive unit 6 includes a magnetic circuit unit installed on the central bottom 1d of the frame 1 and a coil (voice coil) 11. The magnetic circuit section includes a support yoke 5 made of a magnetic material having a concave cylindrical shape, a magnet 9 provided inside the support yoke 5, and a yoke 4 made of a magnetic material installed on the magnet 9. A magnetic gap is formed between the outer peripheral surface of the yoke 4 and the inner peripheral surface of the support yoke 5.

  In the magnetic drive unit 6, the coil (voice coil) 11 is wound around a cylindrical bobbin 7 that is fixed to the central portion of the diaphragm 2 on the movable side and extends rearward. Is interposed in the magnetic gap between the yoke 4 and the support yoke 5.

  The diaphragm 2 is made of resin, paper material, or paper material coated or impregnated with resin. The diaphragm 2 has a cone shape with a central portion protruding forward, and the magnetic drive unit 6 is in a space formed in the rear side of the diaphragm (in a substantially conical space surrounded by the diaphragm 2). At least a part of is arranged. The front end of the bobbin 7 is fixed to the inner peripheral edge 2 a of the hole formed in the center of the diaphragm 2, and the opening portion of the front end of the bobbin 7 is closed with a cap 10. It is. An outer peripheral support plate 8 is bonded to the entire circumference of the outer peripheral edge 2 b of the diaphragm 2. The outer peripheral support plate 8 is a thin-walled elastically deformable sheet material such as butyl rubber, and its cross section is formed in an arc shape. The outer peripheral edge portion of the outer peripheral support plate 8 is bonded and fixed to the mounting surface 1b formed on the flange 1B.

  The dampers 3a and 3b are formed in an annular shape with a cloth material impregnated with resin or coated with resin, or a thin resin plate. The dampers 3a and 3b are corrugated, and concave and convex portions that repeat in the radial direction are formed concentrically, and can bend flexibly in the front-rear direction.

  The damper 3a and the damper 3b have the same inner diameter and the same outer diameter, and are arranged so as to overlap in the front-rear direction. The inner peripheral edge portions of the damper 3a and the damper 3b are individually bonded and fixed to the front end surface and the rear end surface of the ring-shaped spacer 12 fixed on the fixing portion 1a in the first connecting portions 1c and 1c. Has been. The spacer 12 is made of a nonmagnetic metal material such as an aluminum alloy, or a synthetic resin material, and the inner peripheral edge of one damper 3b is sandwiched between the rear end surface and the fixed portion 1a. It is bonded and fixed to the upper surface of the fixed portion 1a. Alternatively, the inner peripheral surface of the spacer 12 is bonded and fixed to the outer peripheral surface of the support yoke 5.

  The outer peripheral edge portions of the damper 3a and the damper 3b are connected to the outer peripheral edge portion 2b of the diaphragm 2 by means such as adhesion at the second connecting portions 3c and 3c, respectively.

  The first connecting portions 1c and 1c are arranged at intervals in the sound generation direction (front-rear direction) by sandwiching the spacer 12. As a result, the first connecting portions 1c and 1c are located at an equal distance in front of and behind the support reference plane II.

  In the second connecting portions 3c and 3c, the outer peripheral edge portions of the damper 3a and the damper 3b are connected to the outer peripheral edge portion 2b of the diaphragm 2 without being spaced apart from each other in the front-rear direction. . Alternatively, the outer peripheral edge portions of the dampers 3 a and 3 b may be connected to the inner peripheral edge portion of the outer peripheral support plate 8 in the second connecting portions 3 c and 3 c.

  In this embodiment, the 1st connection parts 1c and 1c are located in the inner peripheral side, and the 2nd connection part 2b is located in the outer peripheral side.

  When the diaphragm 2 and the bobbin 7 are in the neutral position of the vibration operation, that is, when the center of the coil 11 in the front-rear direction coincides with the center of the opposing portion of the yoke 4 and the support yoke 5, Alternatively, when the vibration driving force is not applied to the diaphragm 2, the positions of the second connecting portions 3c and 3c are coincident with the support reference plane II. That is, when the diaphragm 2 and the bobbin 7 are in the neutral position of the vibration range, in the cross section of FIG. 1, the first connecting portions 1c and 1c and the second connecting portions 3c and 3c are isosceles triangles, respectively. It is located at the apex of

  When a current of an audio signal is applied to the coil 11, the bobbin 7 and the diaphragm 2 vibrate in the front-rear direction due to this current and a magnetic field crossing the coil 11 by a magnetic gap between the yoke 4 and the support yoke 5. And make a sound.

  The outer peripheral edge 2b of the diaphragm 2 is supported by the two dampers 3a and 3b in the first connecting portions 1c and 1c arranged at intervals in the front-rear direction, and the first connecting portion 1c. The diaphragm 2 vibrates back and forth so that 1c and the second connecting portion 3 maintain the shape located at the apex of the triangle. Therefore, it becomes difficult for any part on the circumference of the second connecting portions 3c, 3c to move in a direction approaching the center line OO and a direction away from the center line OO. Since the second connecting portions 3c and 3c are constrained so as to be difficult to move in the horizontal direction in FIG. 1, the diaphragm 2 is less inclined with respect to the center line OO, and moves linearly back and forth. It becomes easy. Therefore, it is easy to suppress the rolling operation of the diaphragm 2 and the bobbin 7.

  The second connecting portions 3c and 3c are formed in an annular shape having a predetermined radius from the center line OO, and the second connecting portion 3c is positioned on the outermost periphery of the diaphragm 2. The diameters of the second connecting portions 3c and 3c can be increased. For this reason, even if the second connecting portions 3c and 3c are slightly inclined with respect to the plane orthogonal to the center line OO, the tilting angle of the diaphragm 2 with respect to the center line OO becomes small. It is easy to suppress the rolling operation of the diaphragm 2.

  Further, when the diaphragm 2 vibrates in the front-rear direction, the two dampers 3a, 3b operate in such a relationship that when one contracts, the other expands. The movement of is hard to be restrained. Therefore, sound distortion is less likely to occur when sounding with a relatively large output.

  Furthermore, the damper 3a and the damper 3b have the same dimensions, and the support spans are also the same. Moreover, when the diaphragm 2 is in the neutral position, the first connecting portions 1c and 1c and the second connecting portion 3c are located at the vertices of the isosceles triangle. Therefore, the restraining force received from the dampers 3a and 3b is the same when the distance from the support reference plane II is the same when the diaphragm 2 is moved forward and when it is moved backward. Therefore, the symmetry of vibration from the support reference plane II to the front and the rear can be ensured, and the sound quality can always be improved.

  Further, in the speaker of this embodiment, as shown in FIG. 1, since the dampers 3a and 3b are located in the space behind the diaphragm 2, the thickness dimension in the front-rear direction can be minimized. In addition, since the rear side of the diaphragm 2 is closed by the dampers 3 a and 3 b, the sound pressure emitted backward from the diaphragm 2 is not easily transmitted toward the front of the diaphragm 2. Therefore, it is possible to prevent the sound pressure emitted forward of the diaphragm 2 from being canceled out by the sound pressure emitted backward, and the sound generation efficiency can be improved.

  Next, FIG. 2 is a partial cross-sectional view showing a speaker according to a second embodiment of the present invention. In this speaker, the second connecting portions 3e and 3e that connect the dampers 3a and 3b and the diaphragm 2 are arranged with an interval A in the front-rear direction. However, since the distance A is sufficiently narrower than the distance B between the first connecting portions 1c and 1c, the same effect as in the first embodiment can be obtained.

Sectional drawing which shows the speaker of the 1st Embodiment of this invention. The partial expanded sectional view which shows the speaker of the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 1a Fixing part 1b Mounting surface 1c 1st connection part 2 Diaphragm 3a, 3b Damper 3c 2nd connection part 4 Yoke 5 Support yoke 6 Magnetic drive part 7 Bobbin 8 Outer periphery support plate 9 Magnet 11 Coil 12 Spacer

Claims (6)

In a speaker having a frame, a diaphragm whose outer peripheral part is supported by the frame, and a magnetic drive unit that is provided between the diaphragm and the frame and drives the diaphragm,
Between the frame and the diaphragm, there are provided a plurality of dampers that support the diaphragm so as to vibrate,
A first connecting portion that connects each of the dampers and the frame side is disposed at a predetermined interval in the vibration direction of the diaphragm, and a second that connects each of the dampers and the diaphragm side. The connecting portions are arranged at intervals narrower than the interval between the first connecting portions with respect to the vibration direction of the diaphragm.   2. The speaker according to claim 1, wherein each of the second connecting portions is arranged without a gap in the vibration direction.   The speaker according to claim 1 or 2, wherein each of the dampers has the same support span between the first connecting portion and the second connecting portion.   The speaker according to any one of claims 1 to 3, wherein the second connecting portion is located on an outer peripheral side, and the first connecting portion is located on an inner peripheral side.   The speaker according to claim 4, wherein an outer peripheral side of the diaphragm is supported by the frame via a deformable outer peripheral support plate, and the second connecting portion is positioned on the outer peripheral side of the diaphragm. .   The magnetic drive unit includes a coil supported by a bobbin fixed to the diaphragm, and a magnetic circuit unit that is provided on the frame side and applies a magnetic field to the coil, and the first coupling unit. The speaker according to claim 4, wherein the speaker is located around the magnetic circuit unit.

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