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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing one
embodiment of a speaker magnetic circuit according to the present invention, and FIG. 2 is a plan
view showing the upper surface of its plate bottom. Explanation of main drawing numbers, 1 иии и и
и и и и и и и и и и и и Voice coil bobbin, I и и и и и и и и и и и и и и и и и ... Ventilation grooves.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of the magnetic circuit of a speaker, and more particularly to a book which aims to provide a
magnetic circuit of a speaker with a good heat dissipation effect. In the magnetic circuit of the
external magnet type speaker generally used conventionally, the first space surrounded by the
diaphragm duster and the voice box, the first space surrounded by the light box, the guide of the
magnetic circuit, the magnet and the plate bottom are surrounded. The air in the third space
surrounded by the second space, that is, the rate, the voice coil and the space, hardly moved even
when the diaphragm moved. There is a slight inflow and outflow of air through Tasiber's vent
and dust cow's vent, but when the diaphragm's piston movement which is non-cohm, -'l '-' 2
always high speed, air + contraction and expansion takes place It is considered to be a turtle that
has no influx of air, as it does. Usually, the destruction of the speaker is caused by heat, but the
air in the first, second and third spaces is swept away as described above as a cause of the heat
radiation effect. Also, the air in the first, second and third spaces acts as stiffness for the Bistoshi
motion of the diaphragm, and greatly affects the characteristics with sound. In consideration of
the influence of the stiffness on the acoustic characteristics, t jitter pole is made hollow and the
space in the first space is made to flow out, or the beating is made to flow in the first space from
the outside. There is also a magnetizing circuit of the speaker. However, in such a magnetic
circuit, the machine pole must be machine-cut, and it has the disadvantage of being a cause of
high cost, particularly in large diameter r-force. Furthermore, since the air in the space of the pile
1 is directly associated with the outside, the air in the second space is further abolished and thus
the heat dissipation effect 3 is further deteriorated. The present invention has been made in view
of the above-described points, and will be described below with reference to the drawings based
on the embodiment. In FIG. 1, il + is a diaphragm, (2) is bonded to the diaphragm (1), a voice coil
is wound around the layer, and a voice coil is wound around tel; (4) is the diaphragm (1) (1) A
double-bonded green spherical dust in sepp, (6) Fi is a tack bar that connects the voice coil (2) to
the frame (6) in a sense-bielastic manner. Also, the student is a magnetic circuit, and the
magnetic circuit is in the form of a jig (8), a rigid ferrite magnet (9) with a gap, a center boe, and
a lumi side integral. It consists of molded topotom tiD. Therefore, the above-mentioned rate
bottom old) Fi-vapor phase @ ? 2 is included, which is a feature of the present invention.
Arrows A and Ay of the diaphragm (1): Directed piste: bonded to the diaphragm fi + by J
movement ntt 4 strike wire 11 l-p (4) and voice coil Bobishi (2) also in the direction of arrows A
and X Peep. Therefore, the air in the first space surrounded by dust or 'J-5 (41 and diaphragm il
+ and voice coil bounce: J + 21 and t jitter pole) is moved, and voice carp 4 LIffepf 21 to t: J
turbo-L (f (f ( L? 'Between the space ll1 (& 4 ? plate (8), magnet (9), t to jitter ball 1 and ?-l ?
topotom ? l! ?????? The air in the second space weir is blown away. Now, assuming that
the diaphragm (1) moves in the direction of the arrow ? ?, the air in the first space 0 is pushed
out to the second space ti via the air gap, and the air lamp ventilation groove of the second space
t19. It is released to the outside through 02. If the diaphragm (1) moves in the direction of the
arrow Ajj, air flows from the outside into the second space ?9 via the ventilation groove a2, and
the second space a! The stool flows into the first space from 9 through the air gap (ii).
Accordingly, the external cold air comes in contact with the voice coil (3) serving as a heat
source, and the heat radiation effect becomes very large. In addition, since the word moves in
and out of the air flow groove riz with respect to the movement of the diaphragm il + in the
direction of the arrow A1, the stiffness of the air in the ff11 space light is reduced, which helps to
improve the acoustic characteristics. That is, by adjusting the width and length of the ventilation
groove 0, adjustment at the lowest resonance frequency is possible, and there is an advantage
that the transient response becomes good. (5) FIG. 2 is a plan view showing the top surface of the
I groove (1) A ventilation groove 03 is provided in the cross direction. The ventilation groove
63Fi is not limited to the cross direction separately, as long as one end of the ventilation groove
tiz is opened to the outside and the other is opened in the second space t1. Also, instead of being
provided on the top surface of the rate bottom I based on the ventilation ma'a, it may be provided
on the bottom surface of the maginee j) +91. Since the ventilation groove t12 is formed not on
the hole but on a flat surface, it can be pressed and can be easily applied to any large magnetic
circuit. As described above, the magnetic circuit of the speaker according to the present
invention has the advantage that the heat dissipation effect is very good and the resistance to
thermal destruction can be increased, and it is possible to empathize and adjust the stiffness of
the diaphragm freely. One further practical purpose is to have the advantage that the method of
achieving the object is very simple.
4. Brief description of the drawings-Fig. 1 is a cross-sectional view of a sixth embodiment of a
magnetic circuit of a loudspeaker according to the present invention (Fig. 2) is a plan view
showing an F surface of rate bottom. Main figure number i! 161 111 (1) ... diaphragm, 12) ...
voice coil bobbin, wide ... magnetic circuit, a key ... ventilation groove. Utility model registration
Mr. Sanyo Electric Co., Ltd. Representative Ige Keisuke 1 person Figure 1 A1! ??? 4 / J4, ~ 7 //
'2 no 3 / 410i 4 Fig. 2/2 / Z / 210/2 / / Application for applicants of utility model Sanyo Electric
Co., Ltd. 5:' 924 representative Ige Tatsu 1 person ',), Lj! l +: Creator address other than Samurai
Gunma Prefecture Club Oizumimachi J. (Sakasaka HIISO address Tokyo Sanyo Electric Co., Ltd.,
in-house 7 '4- tar l 1 name ? ? ?, 1. '-7 scent /,-l
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description, jps53153934
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