JPH1023594A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a speaker with very excellent frequency and sound pressure characteristics by inserting a diaphragm of a thin and long shape with a voice coil coupled therewith into a magnetic gap and coupling a sub cone to a side face of the diaphragm in the major radial a direction. SOLUTION: A track frame 26 is coupled with an upper plate 22 of a magnetic circuit 24 configured by inserting a magnet 21 between the upper plate 22 and a lower plate 23. A diaphragm 29 whose cone 27 is clamped by an edge 28 is adhered to a circumferential ridge of the frame 26 and a middle part of a voice coil 30 is supported by a damper 31 to drive the diaphragm 29 and coupled with the middle part of the diaphragm 29 so as to be fitted to the magnetic gap 25. A tip of the bobbin of the voice coil 30 and a side face in the major radial direction of the cone 27 of the diaphragm 29 causing undesired resonance or face singing are coupled with the sub cone 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elongated speaker used for various audio equipment and video equipment.

[0002]

2. Description of the Related Art A conventional speaker will be described with reference to FIG. FIG. 4 shows a cross section of a conventional track-type speaker in the minor diameter direction.

According to FIG. 1, a track-type frame 6 is connected to the upper plate 2 of a magnetic circuit 4 having a magnet 1 sandwiched between an upper plate 2 and a lower plate 3. A diaphragm 9 having a configuration in which a cone 7 is clamped by an edge 8 is bonded,
An intermediate portion of the voice coil 10 for driving the diaphragm 9 is held at the center by a damper 11 and is coupled to a central portion of the diaphragm 9 so as to fit into the magnetic gap 5. Was bonded.

[0004]

However, conventional track-type and elliptical-type speakers have a thin and lightweight cone 7 for the purpose of improving the sound pressure level, and have a low rigidity. When the diaphragm oscillates, the cone 7
Unnecessary resonance occurs to disturb the frequency characteristics, and in severe cases, poor quality such as abnormal noise due to squeak on the cone surface occurs. These phenomena often occur particularly on the long side surface of the cone 7.

An object of the present invention is to solve such a conventional problem and to provide a speaker having excellent frequency characteristics and sound pressure characteristics.

[0006]

In order to solve the above-mentioned problems, a speaker according to the present invention comprises a magnetic circuit having a magnetic gap, an elongated frame such as a track type or an elliptical type coupled to the magnetic circuit, A track-shaped or elliptical-shaped diaphragm having a voice coil coupled to the periphery of the frame and fitted into the magnetic gap at the center thereof; a tip of a bobbin of the voice coil and a long-diameter side surface of the diaphragm; And a sub-cone coupled with the sub-cone.

With the above structure, a portion of the diaphragm where the unnecessary resonance or surface squeal is likely to occur is reinforced with a sub-cone, and the vibration is limited to prevent the unnecessary resonance and the surface squeal from producing a speaker having excellent frequency characteristics. Can be provided.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a magnetic circuit having a magnetic gap, an elongated frame such as a track type or an elliptical type coupled to the magnetic circuit, An elongated diaphragm such as a track type or an elliptical type having a voice coil coupled to a peripheral edge thereof and fitted into the magnetic gap at the center, a tip of a bobbin of the voice coil, and a long diameter side surface of the diaphragm. And the sub-cone coupled to the diaphragm, the portion of the diaphragm cone where unwanted resonance and surface squeal are likely to occur is reinforced with a sub-cone to limit vibration and prevent unnecessary resonance and surface squeal. An excellent speaker can be provided.

According to a second aspect of the present invention, the end surface of the sub-cone has a curved shape following the shape of the diaphragm.
It has the effect of being easy to assemble and having stable characteristics without deforming the diaphragm.

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is a sectional view of a track-type speaker according to an embodiment of the present invention in a short diameter direction. FIG. 2A is a top view of a sub-cone which is the main part of the speaker, and FIG. Is a sectional view of the same.

As shown in FIG. 1, a track type frame 26 is connected to an upper plate 22 of a magnetic circuit 24 having a magnet 21 sandwiched between an upper plate 22 and a lower plate 23. A diaphragm 29 is clamped by an edge 28, and an intermediate portion of a voice coil 30 for driving the diaphragm 29 is held at the center by a damper 31, and the center of the diaphragm 29 is fitted to the magnetic gap 25. The sub-cone 32 connects the tip of the bobbin of the voice coil 30 to the long-diameter side portion of the cone 27 of the diaphragm 29 where unwanted resonance and surface squeal are likely to occur.

That is, the sub-cone 32 has a central portion 3
2A is connected to the tip of the bobbin of the voice coil 30, and the opposite end surface 32C is connected to the long side surface of the cone 27 of the diaphragm 29 where unwanted resonance and surface squeal are likely to occur. The cone portion 32B of the sub-cone 32 is connected to the tip of the bobbin of the voice coil 30 and the diaphragm 2
Nine cones 27 are connected to the major-diameter side portions thereof, and the shape rigidity of the cones 27 suppresses unnecessary resonance and surface squeal of the cones 27.

The sub-cone 32 also serves as a dust cap. FIG. 3A is a top view of a development example of the sub-cone of the present embodiment, and FIG.
(B) is the same sectional view.

This development example shows a sub-cone of an elliptical speaker, and an end face 32Ca of the sub-cone 32a is formed in an arc shape in accordance with the elliptical shape of the speaker.

In addition, 32Ba is a cone portion, and 32A
“a” is the center, and the configuration as a speaker is the same as that of FIG. With this configuration, assembling of the sub-cone 32a is facilitated, and it is possible to prevent the cone 27 from being deformed at the time of assembling and causing deterioration in characteristics.

[0016]

As described above, according to the present invention, unnecessary resonance and squeal of the cone are generated by connecting the tip of the bobbin of the voice coil and the side face of the diaphragm in the major axis direction of the diaphragm by the sub-cone. Due to the suppression, the occurrence of abnormal noise caused by unnecessary resonance or surface squeal can be prevented, and the frequency characteristics can be made very stable.

Further, it is possible to improve the sound pressure level by reducing the weight of the diaphragm, and to provide an excellent speaker capable of freely controlling the frequency characteristics and the sound pressure characteristics as an application thereof, and its industrial value. Is very large.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a speaker according to an embodiment of the present invention.

FIG. 2 (a) is a top view of a sub-cone which is the main part, and FIG.

FIG. 3A is a top view of a development example of a sub-cone, which is the main part, and FIG.

FIG. 4 is a sectional view of a conventional speaker.

[Explanation of symbols]

 Reference Signs List 21 magnet 22 upper plate 23 lower plate 24 magnetic circuit 25 magnetic gap 26 frame 27 cone 28 edge 29 diaphragm 30 voice coil 31 damper 32, 32a sub-cone 32A, 32Aa central part 32B, 32Ba cone part 32C, 32Ca end face part

Claims (2)

[Claims] 1. A magnetic circuit having a magnetic gap, an elongated frame such as a track type or an elliptical type coupled to the magnetic circuit, and coupled to the periphery of the frame and fitted into the magnetic gap at the center. A loudspeaker comprising an elongated diaphragm such as a track type or an elliptical type having a voice coil coupled thereto, and a sub-cone coupled to a tip of a bobbin of the voice coil and a side surface of the diaphragm in a major diameter direction. 2. The loudspeaker according to claim 1, wherein a portion to be connected to the diaphragm has a curved end surface portion adapted to the shape of the diaphragm as a sub-cone.