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JPH04103094

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DESCRIPTION JPH04103094
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
flat speaker, and more particularly to a flat speaker which is simple in construction and can be
installed in a small space.
[0002]
2. Description of the Related Art The structure of a conventional speaker and the principle of
sound generation will be described by taking a cone type speaker shown in FIG. 4 as an example.
In the figure, reference numeral 1 denotes a donut-shaped ring magnet, 2 a yoke disposed at the
rear of the magnet 1, 3 a plate fixed to the front of the magnet 1, and 4 a diaphragm. A voice coil
6 is wound around the outer periphery of the cylindrical portion 5 at the center of the conical
diaphragm 4. A pole piece 7 fixed to the yoke 2 is provided inside the cylindrical portion 5.
Reference numeral 8 denotes a frame, and the periphery of the diaphragm 4 is supported by the
frame 8 via an edge 10. Further, the outer surface of the central portion of the diaphragm 4 is
supported by the frame 8 via the damper 11.
[0003]
In the above-mentioned cone type speaker, when a voice current flows in the voice coil 6, the
voice coil 6 vibrates back and forth in a complicated manner in accordance with the strength and
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shape (mode) of the current. The movement is transmitted to the diaphragm 4, and the
diaphragm 4 moves back and forth to transmit the vibration of sound to the air facing the
diaphragm 4. It is something that reaches the ear and can be heard.
[0004]
In the above-mentioned cone type speaker, since the diaphragm 4 is supported by the frame 8
through the edge 10 and the damper 11, the vibration of the voice coil 6 is strongly transmitted
to the central portion of the diaphragm 4. The vibration intensity of the area of the diaphragm 4
is not uniform, and the transmission efficiency is not always good, because That is, it can not be
said that the voice generation efficiency is sufficiently high. Also, the volume generated by the
speaker is proportional to the area of the diaphragm. The cone-shaped diaphragm 4 has a
relationship of S = γ2π. For example, in order to obtain the same generation efficiency as the
flat diaphragm, it is necessary to make a speaker having a very large diameter. In particular, in
the case of the cone-shaped diaphragm 4, a diaphragm with a very large diameter is required in
order to efficiently generate sounds for the bass. As a guide, the correct sound can not be
generated unless the circumferential length of the most open portion (opening) of the coneshaped diaphragm is equal to the desired wavelength of the lowest sound. The wavelength of the
sound can be calculated by dividing the speed of sound traveling through the air at normal
temperature (340 meters per second) by the frequency. Therefore, the wavelength of 100 Hz is
3.4 meters, and the wavelength of 50 Hz is 6.8 meters. Therefore, assuming that the desired
lowest sound is 50 Hz, the circumference of the opening of the cone-shaped diaphragm is 6.8
meters (baffle Or in the case of no box). In other words, it is a huge thing about 2 meters in
diameter (in the case of no baffle or box).
[0005]
Problems to be Solved by the Invention The problems to be solved include the points to be
improved in terms of sound generation efficiency, space saving, etc. in the case of the
conventional general cone-type speaker structure. Was left.
[0006]
SUMMARY OF THE INVENTION In the flat speaker according to the present invention, two flat
diaphragms are arranged in parallel with a predetermined distance, and the end of each
diaphragm is supported on the frame, Furthermore, a plurality of elongated permanent magnets
are disposed between the two diaphragms in parallel with the diaphragm so that the polarities of
the adjacent magnets are alternately opposite to S, N, ... with a gap. On the other hand, the coil is
bent in a zigzag shape as viewed from the front, and adjacent linear portions of the coil are
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alternately fixed to the inner side surfaces of the two diaphragms, and each linear portion of the
coil is made by the permanent magnet It is characterized by the structure located in the
produced magnetic field.
[0007]
The permanent magnet is characterized in that the opening is penetrated in a direction
perpendicular to the longitudinal direction and facing the diaphragm.
[0008]
When a voice current flows through a coil located in a magnetic field, the voice current flows in
the opposite direction through the adjacent coil straight portions, so according to the so-called
Fleming's left-hand rule, each straight portion has The force acts in the same direction, and the
two diaphragms to which the coils are fixed are vibrated in the same direction to emit sound
waves.
At this time, air remaining between the side surface of the diaphragm and the permanent magnet
can move through the opening provided in the permanent magnet.
[0009]
Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 is a side view of a flat speaker according to the present invention, FIG. 2 is a cross
sectional view of FIG. 1, and FIG. 3 is a perspective view.
In each of the drawings, reference numerals 12 and 12 denote diaphragms disposed in parallel at
predetermined intervals. The diaphragms 12 and 12 may be made of any material such as paper,
rubber, plastic or metal. The ends of the diaphragms 12 are supported by the frame 14 via the
dampers 13. Denoted at 15, 15 are a plurality of elongated permanent magnets disposed
between the two diaphragms 12, 12 in parallel with the respective diaphragms, and the
permanent magnets 15, 15 have the polarities of the adjacent magnets. Are alternately arranged
in reverse order of S, N, S, N... Each permanent magnet 15, 15... Is provided with a plurality of
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openings 16, 16... Penetrating in a direction perpendicular to the longitudinal direction and
facing the diaphragms 12, 12. The upper and lower ends of the permanent magnets 15 are fixed
to a support frame (not shown).
[0010]
A coil 17 is provided straddling the inner side surfaces of the two diaphragms 12 and 12 and is a
coil bent in a zigzag shape as viewed from the front (the front surface in FIG. 1). The coil 17 has a
rectangular plate-like straight portion 18, 18 and a first bent portion 20 and a second bent
portion 21 for connecting between adjacent straight portions 18, 18 at the upper and lower
portions thereof. doing. Both side edges of the adjacent linear portions 18, 18 are fixed to the
inside of the diaphragms 12, 12 on the opposite side. The first bent portion 20 and the second
bent portion 21 connected to the upper end and the lower end of each of the straight portions
18, 18 are fixed to the inner side surfaces of the opposing diaphragms 12, 12, and the two
diaphragms 12, 12, 12 are supported by the plate-like straight portions 18, 18. Further, the
straight portions 18, 18... Are provided so as to be located in the magnetic field produced by the
permanent magnets 15, 15.
[0011]
The operation of the flat loudspeaker according to this embodiment will be described. When
current is applied to the coil 17, the coil 17 located in the magnetic field moves, as described by
Fleming's left-hand rule. Then, the two diaphragms 12, 12 to which the coil 17 is attached
vibrate with the coil 17. The air in contact with the diaphragms 12, 12 is pushed or pulled,
causing a change in air pressure. This change in air pressure is a sound wave (sound). When the
diaphragm 12, 12 vibrates, part of the wind collides with the permanent magnets 15, 15 ... but
this wind can move through the openings 16, 16 ... formed in the permanent magnets 15, 15 ...
Because of this, the diaphragms 12 and 12 can be smoothly vibrated and sound can be generated
efficiently without being disturbed by the wind pressure.
[0012]
As described above, according to the flat speaker according to the present invention, since the
speaker can be constituted by two flat diaphragms arranged in parallel, it can be made thin and
space can be made. It can save a lot. In addition, the conventional cone-shaped speaker is larger
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in size to produce the same volume as the speaker of the present invention, and is difficult to
manufacture, and a baffle or a speaker box is indispensable, but according to the present
invention And the speaker box can be omitted, which is advantageous in terms of space saving
and the like. Furthermore, although the diaphragm with irregularities as in the cone type speaker
is likely to be disturbed in frequency characteristics due to the irregularity effect due to its shape,
the diaphragm of the present invention is flat and the entire surface vibrates uniformly.
Therefore, the disturbance of the frequency characteristic can be eliminated, and the generation
of sound can be accurately performed in both the high range and the low range.
[0013]
Brief description of the drawings
[0014]
1 is a front view of a flat speaker according to the present invention.
[0015]
2 is a cross-sectional view of FIG.
[0016]
3 is a perspective view of the flat speaker.
[0017]
4 is a longitudinal sectional view of a conventional cone-shaped speaker.
[0018]
Explanation of sign
[0019]
12 diaphragm 13 damper 14 frame 15 permanent magnet 16 aperture 17 coil 18 straight
portion 20 first bent portion 21 second bent portion
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