JP3834508B2 - Magnetic circuit of speaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic circuit for a speaker, and more particularly to a magnetic circuit for a speaker in which a low-frequency speaker and a mid-high frequency speaker are integrally formed.
[0002]
[Prior art]
An example of a speaker in which a middle / high tone speaker is mounted on a low tone speaker using a conventional repulsive magnetic circuit will be described with reference to FIG. The base 1 and the plate frame 2 shown in the figure are fixed to form a speaker support. The base 1 is made of a nonmagnetic material.
[0003]
A magnet 3 and a magnet 21 are fixed to the base 1 so that the magnetic poles face each other with the yoke 6 interposed therebetween, and a magnetic outer ring 8 is fixed to a position facing the yoke 6. These members constitute a repulsive magnetic circuit, and the voice coil bobbin 14 is supported on the plate-like frame 2 via the damper 12 so that the voice coil 16 wound around the voice coil bobbin 14 is positioned in the magnetic flux of the repulsive magnetism. ing.
[0004]
The outer periphery of the woofer diaphragm 10 is supported by the plate-like frame 2, and the inner periphery is bonded to the voice coil bobbin 14. The woofer is configured in this way, but a tweeter is fastened to the upper portion of the base 1.
[0005]
The magnetic circuit of the tweeter is composed of a yoke 24, a magnet 25, and a top plate 26 which are integrally fixed, and the voice coil 17 wound around the voice coil bobbin 15 is positioned in a magnetic gap between the top plate 26 and the yoke 24. Thus, the voice coil bobbin 15 is supported by the yoke 24 via the damper 13. The outer periphery of the tweeter diaphragm 11 is fixed to the voice coil bobbin 15.
[0006]
The yoke 24 configured in this manner is fastened to the support post 23, and the support post 23 is fixed to the support post 22 fastened to the base 1. A dust cover 18 is attached between the diaphragm 10 and the yoke 24 to prevent dust from entering the space around the voice coil 16. In this way, the woofer and the tweeter are integrally formed on the same axis.
[0007]
[Problems to be solved by the invention]
The conventional speaker described above is composed of separate magnetic circuit magnets for the woofer and tweeter, which makes it difficult to use the magnetomotive force, and requires parts such as struts. It was high.
[0008]
The present invention has been made in view of the above points, and the object of the present invention is to make effective use of magnetomotive force by using a common magnet for the low-frequency speaker and the mid-high frequency speaker, and the entire speaker. It is an object of the present invention to provide a magnetic circuit for a speaker that can be configured compactly and that can reduce the number of components.
[0009]
[Means for Solving the Problems]
The magnetic circuit of the speaker according to the present invention is a speaker in which a mid-high sound speaker is mounted on a low-frequency speaker using a repulsive magnetic circuit, and a protrusion is formed above the magnet above the repulsive magnetic circuit of the low-frequency speaker. Then, a yoke for the mid-high sound speaker is fixed on the projecting portion, and a magnet is secured on the yoke to form a repulsive magnetic circuit for the mid-high sound speaker by the projecting portion, the yoke and the magnet on the upper side of the yoke. It is a thing.
[0010]
Further, in the magnetic circuit of the speaker, a groove is provided around the base end portion of the protruding portion, and the voice coil bobbin of the middle / high tone speaker is inserted into the groove .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A speaker according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing one side of a central axis of a speaker according to a first embodiment of the present invention. A base 1 and a plate frame 2 shown in FIG. 1 are fixed to form a speaker support. The base 1 is made of a nonmagnetic material.
[0012]
A magnet 3 and a magnet 4 are fixed to the base 1 so that the magnetic poles face each other with the yoke 6 interposed therebetween, and a magnetic outer ring 8 is fixed to a position facing the yoke 6. These members constitute a repulsive magnetic circuit, and the voice coil bobbin 14 is supported on the plate-like frame 2 via the damper 12 so that the voice coil 16 wound around the voice coil bobbin 14 is positioned in the magnetic flux of the repulsive magnetism. ing.
[0013]
The outer periphery of the woofer diaphragm 10 is supported by the plate-like frame 2, and the inner periphery is bonded to the voice coil bobbin 14. The woofer is configured in this way, but a tweeter is fixed to the upper part of the magnet 4.
[0014]
That is, the yoke 7 is fixed on the protrusion 4 a formed on the upper portion of the magnet 4, and the magnet 5 is fixed on the yoke 7. The magnetic poles of the magnet 4 and the magnet 5 are arranged to face each other. The magnet 4, the yoke 7, and the magnet 5 constitute a repulsive magnetic circuit of the tweeter.
[0015]
A non-magnetic support ring 9 is fixed to the magnet 4. The voice coil bobbin 15 is supported by the support ring 9 via the damper 13 so that the voice coil 17 wound around the voice coil bobbin 15 is positioned in the repulsive magnetic flux of the tweeter. A dust cover 18 is attached between the diaphragm 10 and the support ring 9 to prevent dust from entering the space around the voice coil 16.
[0016]
In this way, the woofer and the tweeter are integrally formed on the same axis, but the magnet 4 constitutes a magnetic circuit of the woofer and the tweeter, and its magnetomotive force is effectively utilized. In addition, no support is required to support the tweeter, and the number of parts is reduced.
[0017]
FIG. 2 is a sectional view showing one side of the central axis of a speaker according to a second embodiment of the present invention. In this example, the entire speaker is supported by a frame 20 that is integrally formed of resin. The damper 12 supports the lower part of the voice coil bobbin 14, the inner periphery of the diaphragm 10 is fixed around the voice coil 16, and the outer ring is not provided on the voice coil 16. Other configurations are the same as those of the first embodiment, and detailed description thereof is omitted. Also in this example, the magnet 4 constitutes a magnetic circuit of a woofer and a tweeter, and the same effect as the first embodiment can be obtained.
[0018]
FIG. 3 is a sectional view showing one side of the central axis of a speaker according to a third embodiment of the present invention. In this example, a groove 4b is provided around the protrusion 4a of the magnet 4 of the first embodiment, and the tip of the voice coil bobbin 15 is inserted into the groove 4b. Although the support ring 9 is fixed to the outside of the groove 4b of the magnet 4, the height of the support ring 9 can be made lower than in the first embodiment. Other configurations are the same as those of the first embodiment, and detailed description thereof is omitted.
[0019]
FIG. 4 is a sectional view showing one side of the central axis of a speaker according to a fourth embodiment of the present invention. In this example, a groove 4b is provided around the protruding portion 4a of the magnet 4 of the second embodiment, and the tip of the voice coil bobbin 15 enters the groove 4b. Although the support ring 9 is fixed to the outside of the groove 4b of the magnet 4, the height of the support ring 9 can be made lower than in the second embodiment. Other configurations are the same as those of the second embodiment, and detailed description thereof is omitted.
[0020]
【The invention's effect】
According to the magnetic circuit of the speaker of the present invention, since the common magnet is used for the magnetic circuit of the low-pitched speaker and the magnetic circuit of the mid-high sound speaker, the magnetomotive force of the magnet is effectively used. In addition, the support for supporting the mid-high sound speaker is not necessary, and the number of parts is reduced.
[Brief description of the drawings]
FIG. 1 is a sectional view showing one side of a central axis of a speaker according to a first embodiment of the present invention.
FIG. 2 is a sectional view showing one side of a central axis of a speaker according to a second embodiment of the present invention.
FIG. 3 is a sectional view showing one side of a central axis of a speaker according to a third embodiment of the present invention.
FIG. 4 is a sectional view showing one side of a central axis of a speaker according to a fourth embodiment of the present invention.
FIG. 5 is a cross-sectional view showing one side of a central axis of a conventional speaker.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base 2 Plate-like frame 3, 4, 5 Magnet 4a Protruding part, 4b Groove 6, 7 Yoke 8 Outer ring 9 Support ring 10 Woof diaphragm 11 Tweeter diaphragm 12, 13 Damper 14, 15 Voice coil bobbins 16, 17 Voice coil 18 Dust cover 20 Frame 21 Magnet 22, 23 Post 24 Yoke 25 Magnet 26 Top plate

Claims (2)

In a speaker in which a mid-high sound speaker is mounted on a low-frequency speaker using a repulsive magnetic circuit, a protrusion is formed on the upper side of the repulsive magnetic circuit of the low-frequency speaker, and a middle is formed on the protrusion. A magnet for a loudspeaker , wherein a yoke for a loudspeaker is fixed, a magnet is fixed on the yoke, and a repulsive magnetic circuit for a medium / high sound speaker is formed by the protrusion, the yoke and the magnet above the yoke. circuit. The speaker magnetic circuit according to claim 1 , wherein a groove is provided around a base end portion of the projecting portion, and a voice coil bobbin of the middle / high tone speaker is inserted into the groove .

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