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DESCRIPTION JPS55165586

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DESCRIPTION JPS55165586
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional perspective view showing a
conventional speaker, FIG. 2 is a half sectional perspective view of one embodiment of the
speaker of the present invention, and FIG. 3 is a half of another embodiment. It is a crosssectional perspective view. 10 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и ........
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Frame иии
Magnetic gap, 26 и и и и и и Voice coil, 28 и и и и и и и и и и и и и и и и и и и и и и Dust cap.
DETAILED DESCRIPTION OF THE INVENTION The present invention seeks to measure the
increase in sound pressure by increasing the proportion of the magnet as much as possible in a
limited size. 77? As a speaker in the second related art, as shown in FIG. 1, a ring-shaped magnet
3 on a plate 2 having a center pole 1 and a magnetic circuit 6 formed by a ring-shaped upper
plate 4 as described above A frame 6 is provided to extend the outer periphery of the plate 4,
and the peripheral edge of the diaphragm 70 is adhesively bonded to the peripheral edge of the
frame 6, and the diaphragm has an upward bending portion 7 'at the middle A voice coil 8 is
coupled to the central portion of 7 and the voice coil 8 is fitted into the magnetic gap 9 of the
magnetic circuit 5. As described above, the magnet 3 and the upper plate 4 are ring-shaped and
both upper and lower surfaces are planar, and the outer diameter of the magnet 3 is increased in
order to increase the magnetic flux density of the magnetic gap 9 and raise the sound pressure
level of the speaker. It is necessary to increase the wall thickness, resulting in an increase in the
size of the magnetic circuit 5 and an increase in the size of the speaker. When the size of the
speaker is limited, the above-described configuration can not be adopted. The present invention
eliminates the above-mentioned conventional drawbacks. Hereinafter, an embodiment of the
present invention will be described with reference to FIG. 2 and FIG. First, referring to the
embodiment shown in FIG. 2, reference numeral 10 is a plate having a center pole 11 at the
center of the upper surface, which is ring-shaped on this play) 10, and its upper surface has a
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mountain shape projecting upward in the middle part A magnet 12 is disposed, and a ringshaped upper plate 13 whose one cross section is bent in a V-shape is disposed along the upper
surface of the magnet on the magnet node 12 to constitute a magnetic circuit 14 doing. A frame
15 made of synthetic resin or the like is coupled to the upper outer periphery of the magnetic
circuit 14, and a peripheral portion of the diaphragm 16 is coupled to the frame 16 by adhesion
or the like. The diaphragm 16 has a bent portion 16 'projecting upward in the middle portion,
and is configured to have a fixed gap between the upper plate 13 and the upper surface of the
upper plate 13. A voice coil 17 is coupled to a central portion of the diaphragm 16, and the voice
coil 17 is embedded in the magnetic gap 18 of the magnetic circuit 14. With such a
configuration, the upper surface of the magnet 12 is projected upward in accordance with the
shape of the diaphragm 16, so the magnetic flux density to the magnetic gap 18 becomes large,
and the sound pressure level as a speaker becomes remarkable It will rise.
The above embodiment utilizes the external magnet type magnetic circuit 14. Next, an
embodiment of a loudspeaker using an internal magnet type magnetic circuit shown in FIG. 3 will
be described. A yoke 19 is provided with a columnar magnet 20 having a spherical upper
surface. A center pole 21 formed in a spherical shape is disposed on the upper surface of the
columnar magnet 20, and the center pole 21 forms an internal magnetic circuit 22. The frame 23
is coupled to the magnetic circuit 22). The peripheral portion of the diaphragm 26 is connected
to the peripheral portion of the frame 23 together with the gasket 24 and F ? ? / ?. A voice
coil 26 is coupled to the central part of the diaphragm 25 of this part 5. The middle part of the
voice coil 26 is held by a damper 27 and is fitted into the magnetic gap 28 of the magnetic
circuit 22 without eccentricity. A dust cap 29 is attached to the upper surface of the central
portion of the diaphragm 25. The dust cap 29 has a dome shape, and a constant gap is formed
between the top surface of the center pole 21 and the dust cap 29. Also in this configuration,
since the spherical portion can be formed thick as the magnet 20, the magnetic flux density of
the magnetic gap 28 can be increased, and the sound pressure level as the speaker can be raised.
As described above, since the speaker of the present invention has a shape in which the upper
surface of the magnet protrudes upward to conform to the shape of the diaphragm or dust cap,
the shape of the speaker is the magnetic flux density of the magnetic gap). You can measure the
sound pressure level by raising it. t и It has six advantages, such as being extremely effective
especially for small speakers, and has a large practical value.
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