JP3787999B2 - Speaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speaker used in various video / audio devices.
[0002]
[Prior art]
A conventional speaker will be described with reference to a cross-sectional view of FIG. In the figure, a plate 11 formed in a disk shape is provided with a magnetic gap 13 having a constant distance between the inner periphery of a yoke 12 and a magnetic circuit 14 in which a magnetic flux 14 radiates through the magnetic gap 13. 15 is composed of a magnet 16.
[0003]
A voice coil 17 includes a bobbin portion 18 formed in at least a cylindrical shape and a coil portion 19 wound around the outer periphery of the bobbin portion 18 and inserted into the magnetic gap 13. And the outer periphery is coupled to the inner periphery of a damper 23 coupled to the frame 21, and the coil portion 19 is inserted at an appropriate position of the magnetic gap 13. Is supported to be.
[0004]
In the speaker configured as described above, when a voice current flows through the coil portion 19 of the voice coil 17, the voice coil 17 vibrates up and down in accordance with the direction of the voice current. Therefore, the diaphragm coupled to the voice coil 17 22 also vibrates in the same way and is emitted to the outside as a sound wave.
[0005]
[Problems to be solved by the invention]
However, since the above-mentioned speaker also emits the sound wave with the opposite phase from the back surface of the diaphragm 22, the sound wave from the back surface interferes with each other unless the sound wave from the surface is cut off, and the frequency characteristic is disturbed. Met.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, a speaker according to the present invention includes a voice coil in which a coil is inserted into two parallel magnetic gaps having the same magnetic flux direction, and a center of a rising portion of the coil is bent inward, and a substantially center is the above voice. A speaker which is not affected by sound interference from the back surface can be provided by configuring the diaphragm which is coupled to the upper and lower portions of the coil and whose outer periphery is coupled to the frame or the magnetic circuit in two places.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, a magnet is coupled between two yokes, and a magnetic circuit having two parallel upper and lower magnetic gaps in which the respective magnetic flux directions are the same is coupled to the magnetic circuit. A frame, a voice coil in which a coil is inserted into the magnetic gap of the magnetic circuit and the center of the up-and-down rising portion is bent inward, and the substantially center is coupled to the upper or lower portion of the voice coil and the outer periphery is the frame or the magnetic circuit It is composed of diaphragms respectively arranged at two upper and lower positions coupled to each other, so that sound waves of the same phase are radiated from both diaphragms, and interference of sound from the back can be prevented. .
[0008]
According to a second aspect of the present invention, an elastic body is disposed on the inner peripheral portion of the voice coil according to the first aspect, and a diaphragm is not required by emitting sound waves directly from the voice coil without providing the diaphragm. It performs the same function as the speaker according to claim 1.
[0009]
Hereinafter, an embodiment of a speaker according to the present invention will be described with reference to FIGS.
[0010]
(Embodiment 1)
FIG. 1 is a cross-sectional view in the short diameter direction of a speaker according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view in the long diameter direction. According to the figure, reference numeral 1 denotes a magnet, which is coupled so as to be sandwiched between two yokes 2, and a magnetic gap 4 is provided so that the magnetic flux 3 is in the same direction above and below to constitute a magnetic circuit 5 as a whole. . Further, the voice coil 6 is bent inward at the central portion of the rising portion 7 in the vertical direction so that the vibration of the voice coil 6 can be braked. Reference numeral 8 denotes a diaphragm having a substantially central portion coupled to the upper and lower portions of the voice coil 6 and the outer periphery coupled to the frame 9.
[0011]
In the speaker configured as described above, when a voice current is applied to the voice coil 6 inserted in the upper and lower magnetic gaps 4, the upper and lower parts of the voice coil 6 vibrate in the opposite directions. However, the rising portion 7 of the voice coil 6 is bent inward so that it can control upside down vibration, and in-phase sound waves are radiated from the front and back diaphragms 8. Thus, it is possible to provide an excellent speaker that does not deteriorate the sound quality without blocking the sound waves on the back surface.
[0012]
Even if the outer periphery of the diaphragm 8 is coupled to the magnetic circuit 5, the same effect can be obtained.
(Embodiment 2)
Another embodiment of the present invention will be described with reference to FIG. The same parts as those in the embodiment are denoted by the same reference numerals, and description thereof is omitted. FIG. 3 is a cross-sectional view of another embodiment of the present invention. According to the figure, the difference from the first embodiment is that there is no diaphragm and a sound wave is directly radiated from the voice coil 6, and an elastic body 10 is arranged inside the voice coil 6 to control the position of the voice coil 6, In addition, it is configured so as not to emit sound waves from the inner peripheral side of the voice coil 6, and it is possible to realize an excellent speaker supply that does not interfere with sound with the back surface at low cost.
[0013]
【The invention's effect】
As described above, the loudspeaker of the present invention has a magnetic circuit in which two magnets are coupled between two yokes and two parallel magnetic gaps having the same magnetic flux direction are provided, and a frame coupled to the magnetic circuit. A voice coil in which a coil is inserted in the magnetic gap of the magnetic circuit and the center of the up and down rising portion is bent inward, and the substantially center is coupled to the upper and lower portions of the voice coil, and the outer periphery is coupled to the frame or the magnetic circuit. By arranging the diaphragms in two places at the top and bottom and radiating sound waves of the same phase from both diaphragms, interference of sound from the back surface can be prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a speaker according to an embodiment of the present invention in the minor axis direction. FIG. 2 is a sectional view of the speaker in the major axis direction. FIG. Cross-sectional view of the speaker
1 Magnet 2 Yoke 3 Magnetic flux 4 Magnetic gap 5 Magnetic circuit 6 Voice coil 7 Rising part 8 Diaphragm 9 Frame

Claims (2)

A magnetic circuit having at least two parallel magnetic gaps in which magnets are coupled between at least two yokes and the magnetic flux directions are the same, a frame coupled to the magnetic circuit, and a magnetic gap of the magnetic circuit The coil is inserted and the center of the up-and-down rising part is bent inward, the approximate center is connected to the upper or lower part of the voice coil, and the outer periphery is arranged at two places up and down connected to the frame or the magnetic circuit. A loudspeaker in which sound waves of the same phase are radiated from both diaphragms. The speaker according to claim 1, wherein an elastic body is disposed on an inner peripheral portion of the voice coil, and a sound wave is directly emitted from the voice coil without providing a diaphragm.

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