JP4264579B2 - Speaker device - Google Patents

Description

  The present invention relates to a speaker device, and is suitably applied to, for example, a cone type speaker.

  Conventionally, there is a cone type speaker configured as shown in FIG.

  In such a cone type speaker 1, an end portion on the outer peripheral side of a substantially conical cone type diaphragm 2 having an opening at the center is fixed to a tip portion of a frame 4 through an edge 3, and the cone type diaphragm 2 is fixed to a damper 5 fixed inside the frame 4, and thus the edge 3 and the damper 5 cause the cone-shaped diaphragm 2 to move forward (arrow a) or the cone-shaped speaker 1. It can be held so as to vibrate only in the opposite direction.

  Further, an annular gasket 6 made of, for example, a rubber material or the like is stuck on the outer peripheral side edge of the edge 3 fixed to the frame 4, and thus the cone type speaker 1 can be used as, for example, a speaker box or an automobile interior panel. When the gasket 6 functions as a cushioning material when it is fixed to the speaker, unnecessary vibration and noise can be effectively prevented from occurring in the speaker box and the interior panel of the automobile.

  Further, a voice coil bobbin 8 around which the voice coil 7 is wound is fixed to the end of the inner peripheral side of the cone type diaphragm 2 integrally with the damper 5, and the opening 2 </ b> A at the center of the cone type diaphragm 2 is formed. A hemispherical head cap 9 is attached to the front so as to cover the opening 2 </ b> A. Thus, the head cap 9 deforms the cone-shaped diaphragm 2 in the radial direction and opens the cone-shaped diaphragm 2. Intrusion of dust or the like into the portion 2A can be prevented in advance.

On the other hand, on the lower end side of the frame 4, a disc-shaped yoke 11 having a cylindrical pole piece 11A formed at the center of the upper surface, and an annular magnet laminated on the yoke 11 so as to surround the pole piece 11A. 12 and a magnetic circuit 10 including an annular plate 13 stacked on the magnet 12 is provided. The magnetic circuit 10 is integrated with the frame 4 by fixing the frame 4 on the plate 13.

  In the magnetic circuit 10, the thickness of the magnet 12 is selected so that the inner peripheral surface of the plate 13 faces the voice coil 7 wound around the voice coil bobbin 8 with a slight magnetic gap g, and the plate 12 The height of the pole piece 11A is selected so that the inner peripheral surface of 13 and the tip of the peripheral side surface of the pole piece 11A of the yoke 11 face each other.

  As a result, in this cone type speaker 1, when a drive current based on an audio signal is applied to the voice coil 7, the voice coil 7 attracts or repels the magnet 12 due to the electromagnetic force generated in the voice coil 7 at this time. In response to this, the cone-type diaphragm 2 can be driven to vibrate in the front-rear direction, so that a sound corresponding to the audio signal can be output to the outside.

As a prior art document on the edge 3 used in such a cone type speaker 1, there is the following Patent Document 1.
Japanese Patent Laid-Open No. 11-313391

  By the way, in the cone type speaker 1, distortion occurs in the cone type diaphragm 2 due to the frequency of the output sound due to the resonance phenomenon generated in the vibration system including the cone type diaphragm 2 and the edge 3. As indicated by the curve k1, there is a problem that the sound pressure level of the output sound varies (that is, the output sound is distorted) according to the range of the output sound. Such a phenomenon is particularly prominent when the cone-type diaphragm 2 is vibrated with a large amplitude, such as when a low-mid range sound is output or when a sound is output with a large volume.

  As one method for solving such a problem, for example, in the above-mentioned Japanese Patent Application Laid-Open No. 11-313391, as shown in FIG. 8, the circle on the inner peripheral side of the edge 14 is spread over the entire surface of the edge 14. It has been proposed to form a plurality of V-shaped grooves 14A at regular intervals in the tangential direction.

  By applying this technique to the cone type speaker 1, the rigidity of the edge 14 can be increased. As a result, even when the cone type diaphragm 2 is vibrated with a large amplitude, the edge 14 causes the cone type vibration. Since the plate 2 can be supported so as not to be distorted, as shown by a curve k2 in FIG. 7, a sound having a stable sound pressure level can be output regardless of the sound range.

  However, according to this method, since the rigidity of the edge 14 is increased, the followability of the edge 14 with respect to the movement of the cone-shaped diaphragm 2 is deteriorated, and particularly when a high-frequency sound is output or a sound is output at a low volume. In some cases, when the cone-type diaphragm 2 is vibrated with a small amplitude, the sound pressure level of the output sound is lowered as shown in FIG.

  The present invention has been made in consideration of the above points, and proposes a speaker device that can always output a high-quality sound by preventing distortion of the output sound and lowering of the sound pressure level.

In order to solve this problem, in the present invention, an inner peripheral side end bonded to the diaphragm, an outer peripheral side end bonded to the frame, and the inner peripheral side end and the outer peripheral side end. The concave portion and / or the convex portion are formed in a predetermined pattern only on the outer peripheral side of the roll portion of the edge having a roll portion having a circular arc shape .

  As a result, this speaker device can effectively prevent distortion of the output sound when the diaphragm is vibrated with a large amplitude and a decrease in the sound pressure level of the output sound when the diaphragm is vibrated with a small amplitude.

As described above, according to the present invention, the inner peripheral side end bonded to the diaphragm, the outer peripheral side end bonded to the frame, and the inner peripheral side end and the outer peripheral side end. Distortion of output sound when the diaphragm is vibrated with a large amplitude by forming a concave and / or convex portion with a predetermined pattern only on the outer peripheral side of the roll portion of the edge having an arc-shaped roll portion. In addition, it is possible to effectively prevent a decrease in the sound pressure level of the output sound when the diaphragm is vibrated with a small amplitude, and thus it is possible to realize a speaker device that can always output a high-quality sound.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In Figure 1 where the same reference numerals are assigned to corresponding parts in FIG. 6, 20 denotes a cone type speaker according to the present embodiment as a whole, similar to the cone type speaker 1 shown in FIG. 6 except for the configuration of the edge 21 It is configured.

In practice, in the case of this cone type speaker 20 , as shown in FIGS. 2 and 3, the inner peripheral side end portion 21A to which the cone type diaphragm 2 is adhered at the edge 21 and the outer peripheral side end portion fixed to the frame 4 are provided. A convex pattern 22 having a predetermined pattern is formed on a roll portion 21 </ b> C having a cross-sectional arc shape that connects to 21 </ b> B.

  In this case, the convex pattern 22 is configured by forming a plurality of convex portions 22A each having a predetermined height inclined at a predetermined angle with respect to the radial direction of the edge 21 over the circumference of the edge 21 at regular intervals. Thus, the rigidity of the edge can be increased by these convex portions 22A.

  As a result, in the cone type speaker 20, the cone type diaphragm 2 is held by the reinforced edge 21 so that the distortion of the cone type diaphragm 2 when the cone type diaphragm 2 is vibrated with a large amplitude is reduced. Thus, distortion of the output sound can be effectively prevented.

  In this case, the formation range of the convex pattern 22 at the edge 21 is selected as the outer peripheral side range from the center position in the width direction of the roll portion 21C indicated by the broken line L1 in FIG. Thus, maintaining the conventional rigidity on the inner peripheral side of the edge 21 prevents deterioration of the followability of the edge 21, and the sound pressure level of the output sound is lowered when the cone-type diaphragm 2 is vibrated with a small amplitude. It is possible to prevent this effectively and effectively.

  In the case of this embodiment, when manufacturing the edge 21 by heat-molding an annular rubber material, the convex pattern 22 is also integrally molded at the same time. The edge 21 can be formed with high productivity as compared with the case where the convex pattern 22 is formed by attaching a member to the surface of the edge 21.

  In the above configuration, the cone type speaker 20 holds the cone type diaphragm 2 on the outer peripheral side of the reinforced roll portion 21C of the edge 21 so as not to be distorted. The cone type diaphragm 2 is held on the inner peripheral side with good followability to the vibration of the cone type diaphragm 2.

Therefore, in this cone type speaker 20, the distortion of the output sound when the cone type diaphragm 2 is vibrated with a large amplitude, or the decrease of the sound pressure level of the output sound when the cone type diaphragm 2 is vibrated with a small amplitude. It can be effectively prevented.

  Actually, according to the experiment, by providing the convex pattern 22 only on the outer peripheral side of the roll portion 21C of the edge 21 as described above, the output caused by the resonance phenomenon of the vibration system as shown by the curve k3 in FIG. It was confirmed that the decrease of the sound pressure level of the output sound can be prevented even in the low and middle sound range while preventing the fluctuation of the sound pressure level of the sound.

  According to the above configuration, since the convex pattern 22 is provided only on the outer peripheral side of the roll portion 21C of the edge 21, the distortion of the output sound when the cone-type diaphragm 2 is vibrated with a large amplitude, or the cone-type A decrease in the sound pressure level of the output sound when the diaphragm 2 is vibrated with a small amplitude can be effectively prevented, and thus a cone type speaker that can always output a high-quality sound can be realized.

  In the present embodiment, the case where the present invention is applied to the round cone type speaker 20 having an external magnetic type magnetic circuit has been described. However, the present invention is not limited to this, and in short, the cone type diaphragm is used. The present invention can be widely applied to speaker devices having various configurations other than those held by edges.

  Moreover, in this Embodiment, although the case where the some convex part 22A was provided in the roll part 21C of the edge 21 was described, this invention is not restricted to this, It is the same or different in addition to or instead of the convex part 22A. You may make it form a some recessed part with a pattern.

  Further, in the present embodiment, a case has been described in which each convex portion 22A is formed to be inclined at a predetermined angle with respect to the radial direction of the edge 21, but the present invention is not limited thereto, As long as the distortion of the cone-shaped diaphragm 2 caused by the amplitude can be prevented, various other forms can be widely applied as the form of the convex portion 22A.

  Further, in the present embodiment, the case where the protrusions 22A are formed at regular intervals over the entire circumference of the edge 21 has been described. However, the present invention is not limited to this, and a cone-type diaphragm or edge is used. If the formation pattern of the convex portion 22A (pattern of the convex pattern 22) is determined in accordance with the stress distribution during vibration of the cone-shaped diaphragm determined by the shape of the convex portion 22A, the convex portion 22A is not necessarily formed at regular intervals. May be.

  For example, when the cone-shaped diaphragm 31 as shown in FIG. 4 is a cone-shaped speaker 30 having an oval shape (therefore, the shape of the opening of the edge 32, the gasket 33, and the end of the frame 34 is also oval), Since stress due to vibration of the cone-shaped diaphragm 31 is applied on the long axis side, the convex pattern 35 having a large number of convex portions 35A on the long axis side may be used.

  If the cone-shaped diaphragm 41 as shown in FIG. 5 is a cone-shaped speaker 40 having a polygonal shape (therefore, the opening shape of the edge 42, the gasket 43, and the frame 44 is also a polygonal shape), Since each vertex portion is more stressed by the vibration of the cone-shaped diaphragm 41, the convex pattern 45 having a large number of convex portions 45A on each vertex portion may be used.

  The present invention can be widely applied to various speaker devices other than cone-type speakers.

It is sectional drawing which shows the structure of the cone type speaker by this Embodiment. It is a front view which shows the structure of the cone-type speaker by this Embodiment. It is _A 1 to A ₁ 'cross-sectional view showing a specific configuration of the edge. It is a front view which shows the structure of the speaker by other embodiment. It is a front view which shows the structure of the speaker by other embodiment. It is sectional drawing which shows the structure of the conventional cone type speaker. It is a basic graph which shows the relationship between a frequency and a sound pressure level. It is a front view which shows a mode that the groove part was provided in the edge.

Explanation of symbols

1, 20, 30, 40 ... cone type speaker, 2, 31, 41 ... cone type diaphragm, 21, 32, 42 ... edge, 4, 34, 44 ... frame, 22, 35, 45 ... Convex pattern, 22A, 35A, 45A ... convex part.

Claims (5)

And the vibration plate,
Frame,
An edge connecting the diaphragm and the frame ;
The edge is
An inner peripheral side end bonded to the diaphragm, an outer peripheral side end bonded to the frame, and a roll portion having a circular arc shape between the inner peripheral end and the outer peripheral end. And the concave and / or convex portions are formed in a predetermined pattern only on the outer peripheral side of the roll portion .
Speaker system. The concave portion and / or convex portion are formed integrally with the edge.
Speaker according to 請 Motomeko 1. The predetermined pattern in which the concave portion and / or the convex portion are formed is as follows.
It is a pattern according to the stress distribution during vibration of the diaphragm determined by the shape of the diaphragm
Speaker according to 請 Motomeko 1. The predetermined pattern is
It is a convex pattern formed by forming a plurality of convex portions with a predetermined height inclined at a predetermined angle with respect to the radial direction of the edge at a constant interval over one circumference of the roll portion.
Speaker according to 請 Motomeko 1. The edge is
An annular rubber material is manufactured by heat molding, and the convex pattern is integrally molded simultaneously with the heat molding.
Speaker according to 請 Motomeko 4.

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