JP3966106B2 - Thin speaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speaker used in various audio equipment and information communication equipment.
[0002]
[Prior art]
A conventional speaker will be described with reference to FIG .
[0003]
FIG. 3 is a sectional view of a conventional speaker.
[0004]
As shown in FIG. 3 , a magnetized magnet 1 is sandwiched between an upper plate 2 and a yoke 3 to constitute a magnetic circuit 4. A frame 6 is coupled to the yoke 3 of the magnetic circuit 4, and a substantially dome-shaped diaphragm 7 is bonded to the peripheral edge of the frame 6. The voice coil 8 coupled to the diaphragm 7 is coupled so as to fit into the magnetic gap 5 of the magnetic circuit 4.
[0005]
[Problems to be solved by the invention]
In the above-described speaker, the diaphragm 7 is also planar in order to reduce the thickness. However, when the diaphragm 7 is planarized, the coupling portion with the voice coil 8 becomes a T-shape. Transmission has been worsened, and the sound pressure level in the high frequency range has been reduced, and the high frequency limit frequency has not been extended and the reproduction band has been narrowed.
[0006]
The present invention solves the above-described problems, and an object thereof is to ensure a high sound pressure level and reproduction band.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following configuration.
[0008]
According to the first aspect of the present invention, the diaphragm is shaped such that the connecting portion with the voice coil protrudes on the opposite side of the voice coil, and the inside of the connecting portion of the diaphragm with the voice coil is the voice coil. with protruding dome-shaped on the side opposite to the center portion of the diaphragm has a recessed structure with a rising portion of the acute angle to the voice coil side, structures this for recessed is a substantially parallel with the magnetic circuit It is a surface . With this configuration, the vibration of the voice coil can be transmitted to the diaphragm with less transmission loss, and the central part of the diaphragm is recessed, so the overall height is not increased and the thickness is reduced. can do.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0010]
(Embodiment 1)
Hereinafter, with reference to the first embodiment will be described the invention described in 請 Motomeko 1 of the present invention.
[0011]
FIG. 1 is a sectional view of a speaker according to an embodiment of the present invention, and FIG. 2 is a sectional view of a diaphragm.
[0012]
As shown in FIGS. 1 and 2, a magnetized magnet 21 is sandwiched between an upper plate 22 and a yoke 23 to constitute a magnetic circuit 24. A frame 26 is coupled to the yoke 23 of the magnetic circuit 24, a substantially disk-shaped diaphragm 27 is bonded to the frame 26, and a cylindrical voice coil 28 coupled to the diaphragm 27 is connected to the magnetic circuit 24. The gap 25 is coupled so as to be fitted.
[0013]
Here, the shape of the diaphragm 27 is a disc shape, and as shown in FIG. 2, the coupling portion A with the voice coil 28 protrudes in an annular shape on the opposite side (upward) from the voice coil 28, and the voice of the diaphragm 27 The inside of the coupling part with the coil protrudes in a dome shape on the opposite side of the voice coil, and the center part has a structure with a concave part with an acute rising part on the voice coil 28 side . The structure portion has a surface substantially parallel to the magnetic circuit . By coupling the voice coil 28 to the coupling portion A, vibration transmission loss can be reduced and transmitted to the diaphragm 27, and the central portion of the diaphragm 27 is recessed, so that the overall height can be reduced. Thinning can be realized without increasing the size.
[0014]
Further, as a secondary effect of making the shape of the diaphragm 27 into a structure in which the shape of the central portion is recessed, an excessive input is applied to the speaker or an external wind pressure is applied, so that the vibration system is moved downward. In this case, the indented structure provided at the center of the diaphragm 27 hits the upper plate 22 and is repelled from the occurrence of a defect that does not return to its original state.
[0015]
【The invention's effect】
As described above, in the speaker of the present invention, the coupling portion with the voice coil of the diaphragm projects to the opposite side to the voice coil, and the inside of the coupling portion with the voice coil of the diaphragm is opposite to the voice coil. with protruding dome-shaped on the side, the center portion of the diaphragm has a recessed structure with a rising portion of the acute angle to the voice coil side, structures this for recessed was the magnetic circuit and substantially parallel to the plane Is. With this configuration, the vibration of the voice coil can be transmitted to the diaphragm with reduced transmission loss, and the overall height is not increased, so that the thickness can be reduced.
[0016]
As described above, the present invention can provide an excellent speaker that can be thinned, and its industrial value is very large.
[Brief description of the drawings]
1 is a cross-sectional view of a speaker according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a diaphragm according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of a conventional speaker.
21 Magnet 22 Upper plate 23 Yoke 24 Magnetic circuit 25 Magnetic gap 26 Frame 27 Diaphragm 28 Voice coil

Claims (1)

A diaphragm and a voice coil coupled to the diaphragm and partially disposed in the magnetic gap of the magnetic circuit are provided, and the coupling portion of the diaphragm with the voice coil protrudes on the opposite side of the voice coil. And the inside of the joint of the diaphragm with the voice coil protrudes in a dome shape on the opposite side of the voice coil, and the center of the diaphragm is recessed with an acute rising part on the voice coil side A thin speaker in which the indented structure has a surface substantially parallel to the magnetic circuit .

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