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JPS59216398

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DESCRIPTION JPS59216398
[0001]
In the industrial field of application mokumitsu is related to air circuits for external magnet type
speakers 14. 2. Description of the Related Art Configuration of the Conventional Example and its
Problems In recent years, many flat plate speakers have been put into practical use as speakers.
In such flat panel speakers, it is difficult to reproduce the audio frequency band with one single
speaker since it uses a region where the diaphragm does not split resonance, and several flat
panel speakers are configured on one speaker box Alternatively, the audio frequency band is
reproduced by a plurality of speaker units in an ff1J circle (14 consisting of 1i ") axis type
composite speakers. The same +1 111 type composite speaker using a conventional magnetic
circuit (this will be described with reference to FIGS. 1 and 2). As shown in FIG. 1, the ring
magnet 1-2 is adhered to the lens pole 1, and the plate 3 is placed thereon, to form a magnetic
circuit. This magnetic circuit is 1) γ! , II Speaker (hereinafter referred to as tweeter), combined
with a 1 (product speaker <hereinafter referred to as woofer) including 1! A two-way coaxial
speaker is shown in FIG. 2 and a tweeter is formed in the central portion via a holding base 5 of
the tweeter river in the J0 woofer it air circuit 4. Reference numeral 6 denotes a tweeter
diaphragm whose outer peripheral portion is fixed to the tweeter frame 8 via an edge 7. An inner
periphery edge 9 of a woofer having a semicircular cross section is fixed to the outer periphery
of the tweeter frame 8, and the inner periphery edge 9 holds the Woehha diaphragm 12 together
with the outer periphery edge 10 and the damper 11. The outer diameter of the tweeter frame 1
\ 8 is equal to the outer diameter of the annular magnet 2 of the tweeter (J is equal to that. This
is to prevent the vibration of the diaphragm 12 for U-no, that is, the (for the inner circumference1 edge 9 not to contact the tweeter frame 8). However, the above-mentioned conventional
configuration C (Or, the diaphragm 12 for uno is costed by the size of the magnetic circuit of the
tweeter, and the area of the diaphragm 12 for the woofer is reduced if the annular magnet 2 of
the tweeter becomes convenient. If the sound pressure is low and the woofer moving plate 12 is
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thick t, A, 逆, the tweeter's magnetic circuit must be small, and the sound pressure of the tweeter
is low F '? The problem is that I SUMMARY OF THE INVENTION The present invention is a
magnetic circuit for use in a tweeter C 'which solves the above-mentioned disadvantages of the
prior art 4, and a magnetic circuit for a speaker which can identify the diaphragm area of the
woofer without reducing the sound pressure of the tweeter. The purpose is to provide. In order to
achieve the above-mentioned object, the magnetic circuit for the speaker of the speaker
according to the present invention comprises a center ball and a play I- that forms a magnetic
gap between the center ball and the center ball, A magnet is provided that abuts on the center
ball and the other end face abuts on the plate, and the outer peripheral face has a diameter that
decreases stepwise or continuously from one end face to the other end face.
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention? Piece will be
described based on the drawings. 3 is a cross-sectional view of a magnetic circuit, and FIG. 4 is a
cross-sectional view of the same type composite speaker using the magnetic circuit shown in FIG.
3. The same components as in FIG. 1 and FIG. The symbol of is attached and the description is
abbreviate | omitted. In FIGS. 3 and 4, 13 is an annular magnet, and this annular magnet has a
step formed at the center in the axial direction of the outer peripheral surface, and the contact
surface side with the center ball 1 bottom is on the side The diameter is larger than that of the
contact surfaces with the plays 1 to 3. According to the conventional configuration, as shown in
FIG. 5, the inner periphery edge 9 of the woo A prevents the contact of the tweeter frame 8 with
vibration due to vibration. The inner circumferential edge 9 can not be positioned. However, in
the magnetic circuit of the present embodiment, since the annular magnet 13 whose outer
diameter on the side of play 1-3 is smaller than the outer diameter on the bottom side of the
pinter pole 1 is used, the large diameter portion of 13 to annular magnet 1 is used. A space can
be formed on the upper side of the woofer, and the woofer inner circumferential circle J can be
adhered more inward. Even when the woofer diaphragm 12 vibrates as shown by the phantom
line in FIG. 6, the inner peripheral edge 9 does not contact the tweeter frame 8. Therefore, the
area of the woofer diaphragm 12 can be increased by reducing the inner diameter of the woofer
diaphragm 12 from ro to r, thereby increasing the area of the woofer diaphragm 12. Further, as
shown in FIG. 7, when the woofer diaphragm 12 having the same inner diameter r as that of this
embodiment is used in the conventional configuration, the annular magnet 1-2 has a small
diameter, and the magnetic flux density of the tweeter magnetic circuit is Although it decreases,
it does not occur in the present embodiment. As a specific example, a woofer of 20 cm in
diameter and 2. In a composite speaker using an F3 Cm tweeter, in the conventional
configuration, the outer diameter GO mm of the annular magnet l-2 of the tweeter is 12 mm
inside diameter 2 Cr mm, height 13 mm, diameter 1 ′ J mm of the hinter pole 1 and width 11 of
the inner circumferential edge 9 When mm, the inside diameter of the moving plate 12 for
woofer 86 mm, the magnetic flux density of the magnetic circuit of the tweeter is 1! 1000ガ
ウスであった。 On the other hand, when the magnetic circuit of this embodiment [; L, the large
diameter portion of the annular magnet 1 to 13 has an outer diameter of 60 mm, a height of 9
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mm, an upper half portion of 50 mm, a height of 4 cities, an inner diameter of 26 mm, The inner
diameter of the diaphragm 12 could be reduced to 76 mm. At this time, the magnetic flux density
of the tweeter was 14700 gauss and did not decrease at all. Also, as shown in FIG. 7, when the
woofer imaging plate 12 with an inner diameter of 70 mm is combined with the conventional
magnetic circuit, the annular magnet 2 of the magnetic circuit of the tweeter has an outer
diameter!
+ 01 H (H 1 inner diameter 2 er mm, height 13 #, the magnetic flux density was significantly
reduced to 13 200 gauss. When the outer diameter of the woofer diaphragm 12 is 1551H1B, the
area of the woofer diaphragm OJ plate 12 is enlarged by about 10% by the magnetic circuit
according to the present embodiment, and the magnetic flux density of the tweeter decreases by
12% in the conventional configuration. In contrast to that, C 'l (which makes it possible to achieve
a good speaker that only reduces by 2%). As shown in FIG. 8 and FIG. 9 (, another embodiment
shown by L) and shown in FIG. 8, the outer side of the ball 1 to the bottom of play 1 to 3 in
multiple stages with t-J. Using an annular magnet 14 with a larger diameter f) J: <, and as shown
in FIG. 9, an annular magnet in which the outer member becomes continuous from the play 1
side to the bottom side of the pinter ball 1 T) J: using 1-15. As described in detail in the
invention, according to the present invention, the outer diameter on the other end face side of
the annular magnet is made smaller than the outer diameter on the one end face side, so the
magnetic flux density is not reduced below 47 around the annular magnet. A space can be
provided in the vicinity of the other end face side, and by forming the coaxial type composite
speaker as a tweeter m'f 4 as a circuit, the vibration area of the woofer can be increased and the
high voltage can be raised.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a conventional magnetic circuit, FIG. 2 is a cross-sectional view
of a coaxial composite speaker using the conventional magnetic circuit, and FIG. 3 is a crosssectional view of the magnetic circuit of FIG. 4 and 5 are sectional views of a coaxial composite
speaker using the same magnetic circuit, and FIGS. 5 to 7 (a coaxial composite speaker using a
conventional magnetic circuit and a magnetic circuit according to an embodiment of the present
invention FIG. 8 is an operation explanatory view of a coaxial type composite speaker using the
present invention, and FIG. 8 and FIG. 9 are respectively a sectional view and a plan view of a
magnetic circuit in another embodiment.
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1 · · · Center ball, 3 · · · Plates, 13.14.15 · · · Ring-shaped magnet 1-agent Yoshihiro Moriki Fig. 1 /
Fig. 2 Fig. 8 Fig. 4 Fig. 1 Figure 2
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