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JP2005252684

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2005252684
The present invention provides a flat speaker having a simple structure and high magnetic flux
density and increased sound pressure. A speaker of a type in which a magnet magnetized on the
opposite surface side of a diaphragm on which a voice coil is printed on a polymer film is
disposed, and the diaphragm is vibrated by a magnetic gap between the magnets Magnetic
collecting members made of ferromagnetic metal are fixed on the surfaces of the N and S poles.
[Selected figure] Figure 3
Flat speaker
[0001]
The present invention relates to a flat speaker.
[0002]
One type of speaker is a flat speaker as shown in FIG.
In this flat speaker, as shown in FIG. 2, a diaphragm 3 on which a voice coil 6 is printed on a
polymer film is used, and magnets 200 arranged on the front and back in the thickness direction
are magnetic gaps. It vibrates 3 and transmits sound. In FIG. 1, 1 and 1 'are frames, 11 and 11'
are sound holes, and 7 is an input terminal of a coil.
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1
[0003]
Such a flat speaker can be thinner than a conventional speaker such as a cone type, and the
sound is emitted as a plane wave, so it is not tired even if you are listening and there is little
reflected wave, so the sound attenuation rate is low. Although it is supposed that it can be
obtained, there is a problem that the decrease in sound pressure is large because the magnetic
gap between the magnets 200 and 200 on the front and back sides of the diaphragm 3 is used.
Japanese Patent Application Publication No. 2001-333493
[0004]
The present invention has been made to solve the above-mentioned problems, and an object of
the present invention is to provide a flat speaker having a high magnetic flux density and an
increased sound pressure with a simple structure. is there.
[0005]
In order to achieve the above object, the present invention relates to a speaker of a type in which
a magnet magnetized on the opposite surface side of a diaphragm on which a voice coil is printed
on a polymer film is arranged and the diaphragm is vibrated by a magnetic gap between the
magnets. A magnetic flux collecting member made of ferromagnetic metal is fixed to the surface
of each of the N pole and the S pole facing the gap of the magnet.
[0006]
In the present invention, since magnetic flux collecting members made of ferromagnetic metal
are fixed on the faces of N pole and S pole facing the gap of the magnet on the opposite surface
side of the diaphragm on which the voice coil is printed on the polymer film. The magnetic flux
can be concentrated at a predetermined point, and the magnetic flux density is increased.
Therefore, the generated output (sound pressure) can be enhanced as compared to the case of
only the N pole and the S pole of the magnet.
[0007]
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2
The magnet collection member has a flat bar shape, and is bonded or insert-molded to the
magnet.
According to this, it can carry out simply, without increasing the size of the gap between the
magnets which oppose.
[0008]
Hereinafter, embodiments of the present invention will be described with reference to the
attached drawings. FIGS. 3 to 6 show an embodiment of the flat speaker according to the present
invention, in which 1 and 1 'are dished or thin box-shaped frames, and the rims 10 and 10' are
provided on the periphery of each frame. A flat disc is formed by polymerizing and fixing the
ridges 10 and 10 '.
[0009]
Reference numerals 2 and 2 'denote magnet units disposed and fixed in the respective frames 1
and 1', so that a plurality of strip plate unit magnets 2a whose magnetic poles are made
perpendicular are such that their polarities are opposite to each other. It arranges on the same
plane. The magnetic poles of the upper and lower magnet units 2 and 2 'in the drawing are N
poles and S poles face each other. The magnet units 2 and 2 'are provided with sound release
holes 21 and 21' penetrating in the thickness direction at regular intervals, and the frame 1
corresponding to the sound release holes 21 and 21 '. The sound release holes 11 and 11 'are
disposed through the thickness direction of 1'.
[0010]
In the present invention, ferromagnetism represented by iron in the N pole surface and the S pole
surface facing the gap side in each of the unit magnets 2a, 2a constituting the magnet units 2, 2 ',
especially in the approximate center position of them. The magnetic flux collectors 5, 5 made of
metal are integrated. The magnetic flux collector 5 is in the form of a flat bar having a
rectangular cross section in this example, and is arranged to extend in the longitudinal direction
of each unit magnet 2a, 2a.
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3
[0011]
For example, when the unit magnet 2a is a sintered magnet, the magnet collection member 5 is
fixed to the surface by an adhesion method as shown in FIG. 5 (a). Further, in the case of a
bonded magnet by injection molding, it may be fixed by insert molding at the time of magnet
molding as shown in FIG. 5 (b). In this case, a proper range of the magnet collection member 5 is
the unit magnet 2a. It becomes buried form. The latter is advantageous in cost because it does
not require post-processing, and the magnetic flux collection efficiency is improved for a small
protrusion height.
[0012]
Reference numeral 3 denotes a diaphragm (diaphragm film) which is held or free from the
magnetic pole faces 20 and 20 'of the magnet units 2 and 2' by a predetermined distance, and is
disposed on one side (or both sides) of the polymer film 30. A plurality of voice coils 6 are
applied in a printing manner. The plane pattern of each voice coil 6 is arbitrary such as a single
stroke frame or spiral shape, but in any case, it is necessary to be placed in the magnetic field
formed by the mutually adjacent permanent magnets 2a and 2a having different polarities. It is.
[0013]
Reference numeral 4 is a buffer sheet stretched on the gap facing surface side of the magnetic
flux collecting member 5 and is made of non-woven fabric or Japanese paper, etc., and is a
dustproof means for blocking the entry of dust through the floating sound holes 11, 11 '. Also
serves as. An air gap is provided between the buffer sheet 4 and the diaphragm 3, and the air gap
prevents the vibration of the diaphragm 3 from being disturbed, and prevents the contact with
the current collecting member 5 even when the diaphragm 3 vibrates largely. , To prevent the
occurrence of noise. The other configuration is the same as that of the conventional flat speaker,
and the appearance is the same as that shown in FIG.
[0014]
To explain the operation of the present invention, when power is supplied to the voice coil 6
through the input terminal, the voice coils 6 are placed in the magnetic field formed by the unit
magnets 2a, 2a adjacent to each other with different polarities. When current flows in the same
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4
direction on the adjacent sides of the coil, the diaphragm 3 receives an electromagnetic force
according to Fleming's left-hand rule, and the diaphragm 3 forms a voice coil with a gap between
the magnet units 2 and 2 '. It vibrates by the flowing audio current.
[0015]
At this time, in the present invention, the magnetic flux collecting members 5 and 5 made of
ferromagnetic metal integrated with the N pole surface and the S pole surface facing the gap side
in the unit magnets 2a and 2a constituting the magnet units 2 and 2 '. Is protruding.
For this reason, the magnetic flux efficiently converges on the magnetic flux collectors 5 and 5,
and as schematically shown in FIG. 6, the magnetic flux density is improved. For this reason, even
if the gap is large, the sound pressure can be increased, and a long plane wave with a powerful
reaching distance can be obtained.
[0016]
Although the magnet units are disposed on both sides of the diaphragm 3 in the embodiment
described above, the magnet unit may be disposed only on one side of the diaphragm 3 without
being limited to this case. In this case, the magnet collection member 5 made of ferromagnetic
metal is integrated with the N pole surface and the S pole surface facing the gap side in each unit
magnet 2a, 2a constituting the magnet unit of only one side thereof. The invention also includes
this aspect.
[0017]
It is a perspective view showing the appearance of a flat speaker. It is sectional drawing which
follows the II-II line of FIG. 1 is a partial cross-sectional view of a flat loudspeaker according to
the present invention. It is a partial perspective view which shows the relationship between a
magnet unit and a diaphragm. (a) And (b) is a local sectional view of a magnet unit. It is
explanatory drawing shown comparing magnetic flux distribution of the flat speaker by this
invention with the case where there is no magnet collection member.
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5
Explanation of sign
[0018]
1 frame 2'2 magnet unit 2a unit magnet 3 diaphragm 5 collecting member 6 voice coil
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