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JPS57176796

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DESCRIPTION JPS57176796
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an example of a
conventional horn speaker using an alnico magnet, FIG. 2 is a sectional view of an example of a
horn speaker using a conventional ferrite magnet, and FIG. FIG. 4 is a distortion characteristic
diagram of the horn speaker shown in FIG. 2, FIG. 4 is a sectional view of one embodiment of the
horn speaker according to the present invention, and FIG. 5 is a distortion characteristic diagram
of the horn speaker shown in FIG. 1 иии и и и Alnico magnet, 2, 9 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 top plate, 5, 10, 21 и и иииииии Air chamber, 6 иии и и и Ferrite magnet, 8 и и и и и и Base
plate, 11 и и и Voice coil, 12 и и и Coil bobbin, 13 и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии иии Horn, 19 и и и и и и Front cover,
20 и и и и и и и Through holes.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horn speaker, in
which a through hole is opened in a base plate separating an air chamber surrounded by a ferrite
magnet and a center pole and an air chamber surrounded by a front cover; It is an object of the
present invention to provide a horn speaker in which distortion due to acoustic cavity resonance
is removed by apparently increasing the volume of an air chamber surrounded by a center pole.
Conventionally, the driver unit of the horn speaker has a center pole 2 on the top of a cylindrical
alnico magnet 1 whose pole diameter is larger than the diameter of the magnet as shown in FIG.
Is fixed, and one end of a yoke 3 having an L-shaped cross section is fixed to the lower part of the
alnico magnet 1, and a ring-shaped top plate 4 is fixed to the other end of the yoke 3. An inner
magnet type magnetic circuit is constituted by the Nico magnet 1 and the center pole 2.3-3 ░
top plate 4. However, since the price of alnico magnets has become extremely high in recent
years, products using ferrite magnets in place of alnico magnets have been commercialized. In
the conventional horn speaker using this ferrite magnet, as shown in FIG. 2, the top plate 7 is
fixed to the upper portion of the ring-shaped ferrite magnet 6, and the base plate 8 is fixed to the
lower portion of the 7 elite magnet 6. . The center pole 9 is fixed to the inner periphery side of
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the ferrite magnet 6 on the base plate 8 and is fixed to the above-mentioned ferrite magnet 6, top
plate 7, base plate (2) 133, rate 8. A magnetic circuit is constituted by the center pole 9. In
general, alnico magnets have a small cross-sectional area because they have high residual
magnetic flux density f (Br), and are used in a high-height form to form an internal magnetic
circuit, and ferrite magnets have large coercivity (He) so that they have a large cross-sectional
area. Used in a form of low height, it becomes an external magnet type magnetic circuit. For this
reason, 7 Elite Magnets 6 I toss phlate 7 of the horn speaker using the ferrite magnet shown in @
2. ????????? The volume v1 of the air chamber lO surrounded by the center pole 9 is
the alnico magnet 1 of the horn speaker using the alnico magnet shown in FIG. It is 1/881 W of
the volume v0 of the air chamber 5 surrounded by the top plate 4. Therefore, the cavity
resonance frequency of the acoustic cavity resonance of the air chamber 10 becomes higher than
the cavity resonance frequency of the air chamber 5, and the cavity resonance frequency of the
air chamber 10 becomes about 300 Hz.
Therefore, the frequency characteristics of the horn speaker shown in FIG. 2 are such that the
level of the second harmonic distortion shown by the solid line I in FIG. 3 and the third (3) 134)
harmonic distortion shown by the broken There was a drawback that the sound quality also lost
clarity. The present invention eliminates the above disadvantages and will be described with
reference to FIG. FIG. 4 shows a cross-sectional view of the horn speaker according to the present
invention. In the figure, the same parts as those in FIG. In FIG. 4, the top plate 7 is fixed to the
upper part of the ring-shaped ferrite magnet 6, and the base plate 8 is fixed to the lower part of
the ferrite magnet 6. A center pole 9 is fixed to the inner periphery side of the 7 emissive magnet
6 on the base plate 8, and the above ferrite magnet 6 I top plate 7, the base plate 8. The center
pole 9 forms a magnetic circuit Fl18. A coil bobbin 12 around which a voice coil 11 is wound is
placed in a magnetic gap between the top plate 7 and the center pole 9, and the coil bobbin 12 is
supported by an end 14 fixed to the top plate 7 by a snap pin 13. In addition, a dome-shaped
diaphragm 15 is fixedly attached to one peripheral edge of the coil bobbin 12 (4) 135, and when
an audio signal current flows through the voice coil 11, the coil povin 12 is vibrated. Shoot and
pronounce. A back cover 16 is fixed to an upper portion of the top plate 7 and holds the moving
plate 15. In addition, equalizers 17a and 17b are placed on the inner side of the moving plate 15,
ie, on the center pole side, to eliminate the phase interference of the sound waves. A front cover
19 for fixing a throat diameter of a driver formed of the base plate 8 and an aperture of the horn
18 is fixed to a lower portion of the base plate 8, and the horn 18 is fixed to a lower portion of
the front cover 19. Here, a through hole 20 is opened at a position corresponding to the air
chamber 10 of the base plate 8, and the air chamber 21 of the volume 11 enclosed by the base
plate 8 and the front cover 19 is communicated with the air chamber 10, The apparent volume of
the chamber 10 is V, + V. As a result, the apparent volume of the air chamber 10 becomes
approximately equal to the volume v0 of the air chamber 5 of the horn speaker (5) 13G using the
alnico magnet shown in FIG. 1, and the cavity resonance frequency of the acoustic cavity
resonance of the air chamber 10 is Lower than the cavity resonance frequency (about 300 h) in
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the case of the horn speaker using the conventional ferrite magnet shown in FIG.
Therefore, the level of the second and 813th high adult Irl distortions near 300 Hz is lowered
and improved. The ferrite magnet 6 has an outer diameter of 180 mm. In the case of a magnetic
circuit with an inner diameter of 95 and a thickness of 20, and a center pole 9 dimension of 72
m in outer diameter, six through holes 20 with a diameter of 6 in the base plate 8? The optimum
condition is obtained, and its frequency #Ii characteristic is shown in FIG. The level of the second
harmonic distortion indicated by the solid line 1 in FIG. 5 and the level of the third adult 11ff
distortion indicated by the broken line ?? are reduced by about 6 dB around 300 Hz as
compared with the conventional distortion characteristic of FIG. Further, the sound pressure
response characteristic shown by the solid line in FIG. 5 does not change as compared with the
conventional sound pressure response characteristic shown by the solid line in FIG. 3, and the
impedance characteristic shown in FIG. In this case, as compared with the conventional
impedance characteristic shown by the solid line W in FIG. 3, the unevenness around 300 peaks
is removed, and a large peak of impedance of the lowest resonance frequency 200 (6) 113 mA @
Hz is made, and the ideal impedance characteristic is can get. Here, if the number of the through
holes 20 is less than 6 places, the strain characteristics and improvement as shown in FIG. 5 (A),
@ can not be obtained, and if the number of the through holes 20 exceeds 6 places, the top plate
7 And the effective magnetic flux density 1 in the magnetic gap between the center pole 9 and
the center pole 9 is reduced. As described above, the horn speaker according to the present
invention communicates through the air holes surrounded by the ferrite magnet, the center pole,
the top plate, the base plate, the base plate, and the air room tiger base plate surrounded by the
front cover. Ferrite magnet because it has a configuration. The apparent volume of the air
chamber surrounded by the center pole, the top plate, and the base plate is increased, and the
frequency at which the air chamber is folded is lowered, and the level of the second and third
harmonic am by the acoustic cavity co-imaging And there is no change in the frequency response
of the sound pressure response, and the impedance W1fl! The number characteristic is an ideal
form, and the sound quality is improved.
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