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JP2001211496

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DESCRIPTION JP2001211496
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
flat speaker.
[0002]
2. Description of the Related Art The vibrating part of a speaker is usually cone-shaped, and the
larger the aperture, the more depth is required. Therefore, high-volume, high-quality sound
equipment and audiovisual equipment are inevitably large-sized devices with large gaps and
depths.
[0003]
On the other hand, from the needs of the consumer side, in order to widen the indoor space,
thinning of audio equipment and video audio equipment is required. The use of liquid crystals for
thinning images has progressed, but the use of thin speakers has been delayed for
commercialization.
[0004]
SUMMARY OF THE INVENTION The present invention provides a flat speaker with a small depth.
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1
[0005]
SUMMARY OF THE INVENTION A flat speaker according to the present invention is a diskshaped disk having a circular space at its central portion, and a permanent magnet in which the
annular inner edge portion and the annular outer edge portion have mutually different magnetic
poles, and the disk In the form of a flat plate having an outer diameter larger than the outer
diameter of the flat portion of the permanent magnet, electric insulating wires are spirally
disposed on the entire surface in a range corresponding to the shape of the flat portion of the
disk permanent magnet And a vibrating plate fixed by an adhesive material containing the
vibrating plate, and the vibrating plate is disposed in parallel with a space above the flat surface
of the disk-like permanent magnet.
[0006]
BRIEF DESCRIPTION OF THE DRAWINGS Embodiments of the invention will be described by
means of the accompanying drawings, in which: FIG.
FIG. 1 is a cross-sectional view showing the basic structure of the flat speaker of the present
invention, FIG. 2 is a plan view of a disc-shaped permanent magnet portion, and FIG. 3 is a plan
view of a diaphragm portion.
The disk-shaped permanent magnet 1 has a circular space 2 at the center, and the annular inner
edge and the annular outer edge have different magnetic poles. In FIG. 1 and FIG. 2, although the
case where the annular inner edge part is S pole and the annular outer edge part is N pole is
shown, it may be the opposite. The diaphragm 3 is a flat plate, generally paper, having an outer
diameter larger than the outer diameter of the flat portion of the disk-like permanent magnet 1,
and in a range corresponding to the shape of the flat portion of the disk-like permanent magnet
4 on one surface thereof. It is arranged spirally and fixed by an adhesive material 5 containing
soft magnetic powder. The vibrating plate 3 is disposed in parallel above the flat surface of the
disk-like permanent magnet 1 at a distance. Reference numeral 6 is a casing, and reference
numeral 7 is a soft iron yoke. As a permanent magnet to be used, one having (BH) max = 30
MGOe or more is desirable.
[0007]
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2
The action mechanism will be described. A magnetic flux generated by a permanent magnet 1
having a disk shape with a circular space at the center and whose annular inner edge and
annular outer edge are different from each other is contained in an adhesive material 5
containing soft magnetic powder on a diaphragm 3 Focused on A magnetic field generated by
supplying an audio current to the spirally arranged electrical insulating wire 4 generates a
repulsive force or an attractive force with the disk-shaped permanent magnet located below, and
as a result, the diaphragm 3 vibrates. To reproduce the sound.
[0008]
Since the diaphragm is flat, the depth of the speaker can be reduced, and the thickness reduction
of the audio device and the audiovisual device can be facilitated.
[0009]
Brief description of the drawings
[0010]
FIG. 1 is a cross-sectional view showing a basic structure of a flat speaker according to the
present invention.
[0011]
FIG. 2 is a plan view of a disc-shaped permanent magnet portion.
[0012]
FIG. 3 is a plan view of a diaphragm portion.
[0013]
Explanation of sign
[0014]
Reference Signs List 1 disc-shaped permanent magnet 2 circular space 3 diaphragm 4 electrical
insulating wire 5 adhesive material 6 containing soft magnetic powder 6 casing 7 yoke
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