JP2003102090A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker used for various acoustic devices and information communication devices that can prevent a sound pressure level from being decreased with downsizing. SOLUTION: A speaker is provided with a sub cone 29 to cover the edge part 27a of a diaphragm 27 from the joint of a voice coil 28 to vibrate the sub cone 29 in the same phase as the diaphragm 27 with respect to the vertical vibration of the voice coil 28, thereby enhancing a sound pressure level due to an extended diaphragm area.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used in various audio equipment and information communication equipment.

[0002]

2. Description of the Related Art A conventional speaker will be described with reference to FIG. FIG. 5 shows a sectional view of a conventional speaker.

According to FIG. 5, a magnetized magnet 1 is sandwiched between an upper plate 2 and a yoke 3 to form an inner magnet type magnetic circuit 4. The frame 6 was coupled to the yoke 3 of the magnetic circuit 4. The edge 7a of the diaphragm 7 is adhered to the peripheral edge of the frame 6, and the voice coil 8 connected to the boundary with the edge 7a of the diaphragm 7 is connected so as to fit into the magnetic gap 5 of the magnetic circuit 4. I was making up.

[0004]

However, the above-mentioned speaker is required to be miniaturized with the miniaturization of the mobile phone which is the set, and the sound pressure level is lowered by the reduction of the area of the diaphragm 7. Was a challenge.

The present invention solves the above problems and provides an excellent speaker capable of improving the sound pressure level.

[0006]

In order to solve the above problems, the present invention has the following constitution.

According to the first aspect of the present invention, the sub-cone is provided so as to cover the edge portion of the diaphragm from the connecting portion of the voice coil. As a result, the sub-cone vibrates in the same phase as the diaphragm with respect to the vertical vibration of the voice coil, and the effect of improving the sound pressure level by increasing the diaphragm area is obtained.

According to the second aspect of the present invention, the outer peripheral portion of the sub-cone is larger than the outer peripheral portion of the diaphragm. As a result, the diaphragm area can be expanded as much as possible, and the effect of significantly improving the sound pressure level can be obtained.

According to a third aspect of the present invention, the outer cone of the sub-cone is formed into a substantially polygonal shape.
As a result, the diaphragm area can be expanded as much as possible while realizing the shape of the sub-cone outer peripheral portion having a high space factor corresponding to the set design, and the effect of significantly improving the sound pressure level can be obtained.

According to a fourth aspect of the present invention, the outer peripheral portion of the sub-cone is formed into a substantially elliptical shape.
As a result, it is possible to realize the resonance distribution due to the substantially elliptical shape of the sub-cone while realizing the shape of the sub-cone outer peripheral part with a high space factor corresponding to the set design, aiming to improve the sound pressure level and stabilize the frequency characteristic. The effect is obtained.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) The first embodiment of the present invention will be described below, particularly, the invention described in claim 1.

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

According to FIG. 1, magnetized magnet 21
Is sandwiched between the upper plate 22 and the yoke 23 to form an inner magnet type magnetic circuit 24. This magnetic circuit 2
The frame 26 is connected to the four yokes 23. The edge portion 2 of the diaphragm 27 is provided on the peripheral portion of the frame 26.
7a is bonded, and the voice coil 28 coupled to the diaphragm 27 is coupled so as to fit into the magnetic gap 25 of the magnetic circuit 24. This diaphragm 27
From the connecting portion of the voice coil 28 of the
The sub-cone 29 is provided so as to cover the edge portion 27a of No. 7.

With this configuration, the sub-cone 29 vibrates in the same phase as the diaphragm 27 with respect to the vertical vibration of the voice coil 28, and the sound pressure level due to the expansion of the diaphragm area can be improved. Further, since the sub-cone 29 is configured to cover the edge portion 27a of the diaphragm 27, there is an effect of reducing unnecessary radiant energy such as edge resonance from the edge portion 27a, and the frequency characteristic can be improved. . Furthermore, this speaker is a sub-cone 29
Since the end portion of is composed of the joint portion of the voice coil 28 having a large relative aperture, the distance to the edge is shorter than that of the speaker of the type in which the sub-cone is joined near the center portion. As a result, the sound pressure level improving effect becomes very large.

(Second Embodiment) The second embodiment of the present invention will be described below, particularly the invention described in claim 2. FIG. 2 shows a cross-sectional view of the speaker according to the embodiment of the present invention. The difference from the first embodiment is that the outer peripheral portion of the sub-cone 29 is larger than the outer peripheral portion of the diaphragm 27. As a result, the diaphragm area can be expanded as much as possible corresponding to the set design, and the sound pressure level can be significantly improved.

(Third Embodiment) The third embodiment of the present invention will be described below with reference to the present invention. FIG. 3 is a plan view of the speaker according to the embodiment of the present invention. The difference from the first embodiment is that the shape of the outer peripheral portion of the sub-cone 29 is formed into a substantially quadrangular shape. As a result, it is possible to expand the diaphragm area as much as possible while realizing the sub-cone outer peripheral shape having a high space factor corresponding to the set design, and to significantly improve the sound pressure level.

(Embodiment 4) In the following, the invention according to claim 4 of the present invention will be described with reference to Embodiment 4. FIG. 4 is a plan view of the speaker according to the embodiment of the present invention. The difference from the first embodiment is that the outer peripheral portion of the sub-cone 29 has a substantially elliptical shape. As a result, the diaphragm area can be expanded while realizing the shape of the sub-cone outer periphery with a high space factor corresponding to the design of the set, the sound pressure level is improved, and the substantially elliptical sub-cone 29 causes resonance dispersion. Since it can be achieved, the frequency characteristics can be stabilized.

[0019]

As described above, the speaker of the present invention is constructed by providing the sub-cone so as to cover the edge portion of the diaphragm from the connecting portion of the voice coil. With this configuration, the sub-cone vibrates in the same phase as the diaphragm with respect to the vertical vibration of the voice coil, and the sound pressure level can be improved by increasing the area of the diaphragm.

As described above, the present invention can provide an excellent speaker capable of improving the sound pressure level even if the speaker is miniaturized, and its industrial value is extremely great.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a speaker according to another embodiment of the present invention.

FIG. 3 is a plan view of a speaker according to another embodiment of the present invention.

FIG. 4 is a plan view of a speaker according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view of a conventional speaker

[Explanation of symbols]

21 magnet 22 Upper plate 23 York 24 Magnetic circuit 25 magnetic gap 26 frames 27 diaphragm 27a Diaphragm edge part 28 voice coils 29 sub cones

Claims (4)

[Claims] 1. A frame coupled to a magnetic circuit, a diaphragm coupled to the frame, and a boundary portion between the diaphragm and an edge of the diaphragm, a part of which is disposed in a magnetic gap of the magnetic circuit. A speaker including a voice coil, wherein a sub-cone is provided so as to cover an edge portion of the diaphragm from a connecting portion of the voice coil. 2. The speaker according to claim 1, wherein the outer peripheral portion of the sub-cone is larger than the outer peripheral portion of the diaphragm. 3. The speaker according to claim 1, wherein an outer peripheral portion of the sub-cone has a substantially polygonal shape. 4. The speaker according to claim 1, wherein an outer peripheral portion of the sub-cone has a substantially elliptical shape.