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JP2000184487

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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 JP2000184487
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
small-sized speaker, and more particularly to a speaker with improved high-frequency directional
characteristics.
[0002]
2. Description of the Related Art Heretofore, as a small-sized speaker, for example, a dynamic
speaker having a diameter of about 65 mm is often used. FIG. 6 shows the configuration of such
a dynamic type speaker.
[0003]
In FIG. 6, A generally indicates a conventional small speaker, and the yoke 3 has a disk-like
portion made of a plate material such as pure iron, and a cylindrical center pole 3a erected at the
center position of the disk-like portion. The magnet guide portion 3b is formed integrally with
the disk-shaped portion and is formed of concentric steps.
[0004]
A ring-shaped driving magnet 1 magnetized in the thickness direction of ferrite or the like is
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adhered onto the disk-shaped portion of the yoke 3 through an adhesive.
The inner diameter of the ring-shaped drive magnet 1 is fitted to the step of the magnet guide
portion 3b formed in the disk-like portion of the yoke 3 and positioned.
[0005]
The plate 2 is joined onto the driving magnet 1. In this case, the gap guide is kept inserted into
the center pole 3a, an adhesive is applied to the top surface of the driving magnet 1, and the
inner diameter of the plate 2 is inserted into the outer diameter of the gap guide and fixed. The
plate 2 is made of pure iron or the like in the shape of a disk, and is a punched plate material
having a through hole in the center and is a voice coil bobbin 8 in a magnetic gap 4 formed
between the inner periphery of the through hole and the outer diameter of the center pole 3a. Is
provided.
[0006]
The metal part of the magnetic circuit is configured by fixing the frame 5 formed in a funnel
shape with steel or the like to the plate 2.
[0007]
The voice coil 9 wound around a cylindrical voice coil bobbin 8 is inserted into the magnetic gap
4 of the magnetic circuit, and the voice coil bobbin 8 is held via the damper 10 having a
corrugated corrugation swingably in the vertical direction.
[0008]
The inner diameter portion of the damper 10 is bonded to the middle portion of the voice coil
bobbin 8 via an adhesive, and the outer diameter portion is bonded to the outer periphery of the
bottom portion of the frame 5.
Furthermore, the inner diameter of a funnel-shaped cone 7 with a free or fixed edge 6 made of
paper or the like is joined to the upper outer diameter of the voice coil bobbin 8 and the largest
diameter of the cone 7 is gasketed at the upper opening rim of the frame 5 The cap 14 is fixed
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on the voice coil bobbin 8 or the cone via an adhesive or the like.
Reference numeral 12 denotes a tinsel wire, and 13 denotes an input terminal.
[0009]
In the conventional small speaker as described above, when the aperture is reduced to 65 mm or
less, the directivity characteristic in the high region is deteriorated, and in particular, there is a
problem that the feeling of sound spreading disappears. Degrade the sound quality of In
particular, as in the gain-frequency characteristic curve shown in FIG. 7, the directivity
characteristic has a problem that the drop in the high region is large at 30 ° to 60 ° compared
to the front, and the directivity characteristic is not sufficiently improved.
[0010]
Fig. 7 shows the gain-frequency characteristic curve of the small speaker with a diameter of 65
mm shown in Fig. 6, the horizontal axis shows frequency (Hz) and the vertical axis shows
response (dB), and the directivity at 60 ° is 4 KHz to It is greatly deteriorated compared to the
directivity characteristic (0 °) of the front at 20 KHz.
[0011]
The present invention is intended to provide a small speaker that solves the problems as
described above, and the problem to be solved by the invention is to obtain a small speaker with
improved directivity in the high frequency range. It is.
[0012]
SUMMARY OF THE INVENTION The present invention is a speaker having a cap disposed on the
upper side of a wound voice coil bobbin of a voice coil constituting a vibration system, the cap
having a spherical shape, It is what made it a diffuser.
[0013]
According to such a small speaker of the present invention, high-pitched sound emitted from the
inner surface of the cone 7 is reflected by the spherical surface of the cap-cum-diffuser 15 and
emitted. Can also be better.
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[0014]
BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of the speaker according to
the present invention will be described below with reference to FIGS.
The parts corresponding to those of the speaker apparatus shown in FIG.
[0015]
FIG. 1 shows a side sectional view of the small speaker of this example, and A shows the small
full-range small speaker of about 65 mm in diameter of this example as a whole, and shows a
magnetic circuit consisting of yoke 3, magnet 1 and plate 2 and a center pole. A voice coil 9
wound around a voice coil bobbin 8 as a vibration system which is swingably inserted into a
magnetic gap 4 formed between the plate 3 and the plate 2 and an outer diameter portion of one
of the funnel-shaped cones 7 is a frame 5 The other inner diameter portion of the cone 7 is fixed
to the upper outer diameter of the voice coil bobbin 8 and the voice coil bobbin 8 shakes the
above-described vibration systems up and down via the damper 10 It is movably held on the
bottom of the frame 5.
Each configuration described above is completely the same as FIG.
[0016]
In this example, the shape of the cap 14 joined to the small speaker speaker 7 or the voice coil
bobbin 8 is different from that of FIG. It demonstrates using.
[0017]
The voice coil bobbin 8 in this example is selected to have a length projecting upward from the
inner diameter portion formed at the center of the cone 7.
Then, a cap-cum-diffuser 15 having the same diameter as the voice coil bobbin 8 or a slightly
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larger oval or spherical diameter is joined to the upper opening of the voice coil bobbin 8
through an adhesive or the like.
[0018]
The oval-sphere or spherical cap-cum-diffuser 15 can be easily formed into a spherical or
elliptical sphere by molding a synthetic resin or the like by pressure back molding or air blow
molding.
[0019]
According to the small speaker of the above-mentioned configuration, the directivity
characteristic of the high region is improved, and the high region is diffused by the diffuser
which is also used as the cap, and it is possible to obtain one capable of greatly expanding the
sound.
[0020]
That is, as shown in FIG. 1, the high frequency radiation sound 17 radiated from the cone 7 as
shown in FIG. 1 is reflected by the diffuser / cap 15 and the high frequency radiation 17 is
radiated on the outer surface of the cap / diffuser 15 For this reason, the directivity in the high
region is greatly improved like the 60 ° directivity shown by the dotted line in the gainfrequency characteristic curve of FIG.
In addition, the high frequency area is diffused over the entire circumference by the effect of the
diffuser / cap 15 and the high frequency area widening feeling is improved.
[0021]
FIG. 3 shows another side view of the small-sized speaker according to the present invention, and
the corresponding parts to FIG. I will explain only the points.
[0022]
The magnetic circuit and the vibration system of the speaker A in FIGS. 3 to 5 are completely the
same as those in FIG. 1, and the case where the manufacturing method of the cap and diffuser 17
is different is shown.
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[0023]
In the case of FIG. 3, upper and lower hemispheres 15U and 15D obtained by molding the cap
and diffuser 15 into a substantially hemispherical shape by synthetic resin etc. are engaged with
each other at the opening face and joined together and mounted on the upper opening of the
voice coil bobbin 8. It is placed and bonded through an adhesive.
[0024]
In the case of FIG. 4, the upper hemisphere 15U of the cap-cum-diffuser 15 is formed into a
hemispherical shape as in FIG. 3, and the lower hemisphere 15D, which is the lower hemisphere,
is fitted into the upper outside diameter of the voice coil bobbin 8 Is formed on the lower side of
the lower hemisphere 15D to facilitate joining when bonding on the voice coil bobbin 8, and a
ring-shaped portion 18 surrounding the outer periphery of the opening surface of the upper and
lower hemispheres 15U and 15D is formed. The ring-shaped parts are joined together to form a
spherical shape.
[0025]
The cap-cum-diffuser 15 shown in FIG. 5 has the upper hemisphere 15U identical to that of FIGS.
3 to 4 but has a through hole 16 larger than the upper opening outer diameter of the voice coil
bobbin 11 below the lower hemisphere 15D. In this case, the upper end portion of the voice coil
bobbin 8 is inserted into the inside, and the lower hemisphere 15D is joined to the inner
diameter portion of the cone 7.
In this case, the strength near the inner diameter of the cone 7 can be increased by the adhesive.
[0026]
Even with the cap-cum-diffuser 15 of various configurations shown in FIGS. 3 to 5 described
above, the same effect as in FIG. 1 can be obtained, and the directivity characteristic of 30 ° to
60 ° of the high region is improved to obtain the high region. It is possible to disperse radiation
and improve the directivity characteristic of high-range 30 ° to 60 °.
[0027]
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According to the small-sized speaker of the present invention, in the full-range small-sized
speaker, the problem that the directivity characteristic is deteriorated and the feeling of the
expansion of the high region is eliminated is solved.
That is, by using the cap-cum-diffuser, the directivity characteristic of the high region (in
particular, the 60 ° directivity characteristic) is significantly improved, and the one where the
spread feeling of the high region sound is significantly improved is obtained.
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