JP2004187234A - Speaker unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker unit in which unwanted resonance is reduced to obtain a high sound quality. <P>SOLUTION: In a speaker unit 10 which is provided with a magnetic circuit 13 including a magnet 14 and a yoke 11, a voice coil 16 disposed in a magnetic gap 12 of the magnetic circuit 13, and a diaphragm 17 that vibrates being coupled to the voice coil 16, and in which the edge of the diaphragm 17 is fixed on a casing 20, a damper holder 30 is provided in a mounting part of a damper 27 and the casing 20. It is preferable that the damper holder 30 is made of a hybrid material of resin and tungsten, and that its specific gravity is less than 5.0. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a speaker device.
[0002]
[Prior art]
Conventionally, various types of speaker devices have been disclosed (for example, see Patent Documents 1 and 2).
[0003]
FIG. 1 shows a loudspeaker device that is often used in homes or vehicles in recent years.
The speaker device 100 is based on a moving coil system. An annular magnet 104 is arranged above a pole yoke 106, and an annular plate 105 is arranged above the annular magnet 104. A magnetic circuit 107 is formed by the pole yoke 106, the annular magnet 104, and the annular plate 105.
[0004]
A voice coil 102 wound around an end of the voice coil bobbin 103 is disposed in a magnetic gap 107a of the magnetic circuit 107, and the voice coil bobbin 103 is fixed to a central hole of a cone paper 101 which is a substantially conical diaphragm. Have been.
A cap 113 is attached to the center hole. An edge 108 is provided on an outer peripheral portion of the cone paper 101, and is attached to an outer peripheral portion of the frame 112 via a packing 114 made of paper.
[0005]
The central portion of the cone paper 101 is supported by a frame 112 via a damper 109. Thereby, the cone paper 101, the voice coil 102, and the voice coil bobbin 103 can be vibrated in the central axis X direction of the speaker device 100 in an integrated state.
Further, positive and negative input terminals 110 are attached to the frame 112, and both ends of the voice coil 102 are electrically connected to the positive and negative input terminals 110 via lead wires (kinshi wires) 111, respectively.
[0006]
When a drive signal (drive current) is supplied from an external power supply to the input terminal 110, the voice coil 102 receives an electromagnetic drive force corresponding to the drive signal in the magnetic gap 107a of the magnetic circuit 107, and The voice coil 102 vibrates in the direction of the central axis X of the speaker device 100 integrally with the voice coil bobbin 103 and the cone paper 101, and acoustic energy according to the drive signal is emitted from the cone paper 101.
In some cases, a magnetic circuit is formed using an exciting coil acting as an electromagnetic magnet instead of the magnet 104.
[0007]
[Patent Document 1]
Japanese Patent Publication No. 56-15196 (page 1, FIG. 1)
[Patent Document 2]
JP-A-57-106387 (page 2-3, FIG. 1)
[0008]
[Problems to be solved by the invention]
By the way, in the case of the prior art described above, the damper 109 has one end connected to the cone paper 101 and the other end connected to the frame 112. For this reason, the resonance of the damper 109 and the resonance of the frame 112 propagate through the damper 109 and return to the voice coil 102, so that a distorted sound is transmitted to the cone paper 101 with a delay, and the sound quality is deteriorated.
[0009]
As an example of the problem to be solved by the present invention, there is a problem that the resonance of the damper and the resonance of the frame generated in the above-described related art are transmitted through the damper and return to the voice coil to deteriorate the sound quality.
[0010]
[Means for Solving the Problems]
The loudspeaker device according to the first aspect of the present invention includes a magnetic circuit including a magnet and a yoke, a voice coil disposed in a magnetic gap of the magnetic circuit, and a vibration that can vibrate while being coupled to the voice coil. A speaker device comprising: a plate and a damper disposed between the voice coil side of the diaphragm and a housing, the speaker device having a damper holder provided on the housing, wherein the damper is provided on the damper holder. It is characterized by being connected.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment according to the present invention will be described with reference to the drawings. 2 is a sectional view of the speaker device according to the present invention, FIG. 3 is a front view of the speaker device, and FIG. 4 is a rear view of the speaker device.
[0012]
The speaker device 10 has a yoke 11 in the center, and a magnetic gap 12 is formed between the yoke 11 and the yoke 11 to form an annular magnet 14 and an annular plate 15 constituting a magnetic circuit 13. Have. The magnet 14 may be magnetized by a DC power supply, or may be a magnet using a permanent magnet.
A voice coil 16 made of a thin copper wire or the like is provided in the magnetic gap 12 so as to be movable back and forth. The voice coil 16 is attached to a central hole of a cone paper 17 which is a substantially conical diaphragm. I have. A cap 18 is mounted in front of the central hole of the cone paper 17.
[0013]
On the rear surface of the yoke 11, a circular mounting surface 21 constituting a frame 20 as a housing is mounted by screws 22. From the mounting surface 21, a plurality of (here, the yoke 11 and the magnet 14) are included. (Five) arms 23 are provided so as to spread radially forward.
A terminal support ring 24 is attached at an intermediate position of the arm 23, and a pair of speaker terminals 25a and 25b for both positive and negative poles are attached below the terminal support ring 24. The voice coil 16 is electrically connected to the positive and negative speaker terminals 25a and 25b via lead wires (tinted wires) 26 and 26, respectively.
[0014]
A damper 27 is provided between the terminal support ring 24 and the cone paper 17, and supports the voice coil 16 so as to be accurately positioned in the magnetic gap 12. The damper 27 has elasticity so that it can flexibly follow the forward and backward movement of the voice coil 16. A ring 28 is integrally provided at the tip of the arm 23, and an outer peripheral edge 17 a of the cone paper 17 is attached to the ring 28.
[0015]
In the vicinity of the outer peripheral edge of the cone paper 17, a plurality of edges 17b are provided concentrically. The edge 17b is bent in a substantially arc shape so that the cone paper 17 can vibrate smoothly and suppress abnormal movement during the vibration.
[0016]
Therefore, when a signal current flows from the speaker terminals 25 a and 25 b connected to an external power supply to the voice coil 16, the voice coil 16 generates a magnetic field, and the voice coil 16 vibrates back and forth by the action of the magnetic circuit 13. As a result, the cone paper 17 vibrates back and forth, and generates sound as compression waves of air.
[0017]
FIG. 5 is an enlarged cross-sectional view of a mounting portion between the damper 27 and the frame 20. The damper 27 is attached to the frame 20 via a damper holder 30. The damper holder 30 has a ring shape and is attached to the frame 20 by an appropriate means.
Note that a hybrid material of resin and tungsten is used for the damper holder 30. Here, it is desirable to use acrylotril butadiene styrene as the resin. It is desirable that the specific gravity of the damper holder 30 be less than 5.0.
[0018]
According to the speaker device 10 described above, the damper holder 30 is formed using a material having high specific gravity and high attenuation, and by connecting the damper 27 to the damper holder 30, the center of the speaker device 10 can be set at the center of gravity. Good weight balance can be maintained.
Further, by coupling the resonance propagation of the damper 27 and the propagation of the resonance of the frame 20 at points, it is possible to prevent the fusion of the unnecessary resonance. In the low-tone range, the damper holder 30 and the frame 20 have the same phase due to the connection of points, so that the damper holder 30 and the frame 20 are not attenuated.
[0019]
Further, by using a hybrid material of resin and tungsten as a material for forming the damper holder 30, the volume of the speaker device 10 can be increased without change because of its high specific gravity and high attenuation, and the reaction component of the magnetic circuit is reduced. Can be reduced.
[0020]
When acrylotrile butadiene styrene is used as the resin, coating is possible, so that the appearance can be improved.
Further, by setting the specific gravity of the damper holder 30 to less than 5.0, the insulating property is maintained, so that the influence of the magnetic field due to the provision of the damper holder 30 can be prevented.
[0021]
Note that the speaker device 10 of the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made.
For example, in the above-described embodiment, the cone-shaped speaker device has been described, but the present invention can be similarly applied to a dome-shaped speaker device.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a conventional speaker device.
FIG. 2 is a sectional view showing an embodiment of the speaker device according to the present invention.
FIG. 3 is a front view as viewed from a direction III in FIG. 2;
FIG. 4 is a rear view as viewed from an IV direction in FIG. 2;
FIG. 5 is an enlarged sectional view of a portion where a damper is attached to a frame via a damper holder.
[Explanation of symbols]
Reference Signs List 10 speaker device 11 yoke 12 magnetic gap 13 magnetic circuit 14 magnet 16 voice coil 17 cone paper (diaphragm)
20 frame (housing)
27 Damper 30 Damper holder

Claims (4)

A magnetic circuit including a magnet and a yoke, a voice coil disposed in a magnetic gap of the magnetic circuit, a diaphragm capable of vibrating in a state coupled to the voice coil, a voice coil side of the diaphragm and a housing And a damper disposed between the speaker device and
A speaker device, comprising: a damper holder provided in the housing, wherein the damper is connected to the damper holder. The speaker device according to claim 1, wherein the damper holder is a hybrid material of resin and tungsten. The speaker device according to claim 1, wherein the resin is acrylotrile butadiene styrene. The speaker device according to claim 1, wherein the specific gravity of the damper holder is less than 5.0.

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