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DESCRIPTION JPS59139798

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DESCRIPTION JPS59139798
[0001]
The present invention provides a speaker having a higher high frequency limit frequency by
providing a ring-shaped bobbin reinforcement on the inner peripheral surface of the voice coil
bobbin and directing the Young's modulus of the connecting portion of the diaphragm and the
voice coil bobbin. It is provided. A conventional speaker will be described. In FIG. 1, a frame 6 is
provided in a magnetic circuit 5 constructed by incorporating a ring-shaped matrix 3 and a ringshaped top plate 4 in a blade 2 ′ ′ 2 having a center pole 1. A gasket 7 and a peripheral edge
of the diaphragm 8 are joined to a peripheral edge of the frame 6, and a voice coil bobbin 10
having a voice coil 9 wound around the outer peripheral surface is coupled to a central portion of
the diaphragm 8 The voice coil bobbin 10 is held by Danno: 11 whose peripheral edge is fixed to
the inner bottom surface of the frame 6, and the voice coil 9 is eccentrically fitted into the
magnetic gap 12 of the magnetic circuit 5 Dust camp 13 was stuck on the upper surface. In the
speaker of the above configuration, the high frequency limit frequency indicating the high sound
reproduction limit of the speaker is given by the following equation. In the above equation (1), fR
is the upper limit frequency, M1 is the mass of the voice coil bobbin 1o mounted with the voice
coil 9, M2 is the mass of the diaphragm 8, a is the aperture angle of the apex angle of the
diaphragm 8, a ' Is the effective radius of the diaphragm 8, E is the overall Young's modulus of
the diaphragm 8 and the voice coil bobbin 10, ρ. Is the density of the diaphragm 8. As apparent
from the above equation (1), it can be understood that the high frequency band limit frequency
fR is increased if the overall Young's modulus E of the diaphragm 8 and the voice coil bobbin 10
is increased. That is, as the diaphragm 8 and the voice coil bobbin 10 are closer to a perfect rigid
body against vibration, the speaker can obtain good sound pressure characteristics up to a high
frequency region. Therefore, in the connection of the voice coil bobbin 10 and the diaphragm 8
in which the voice coil 9 is conventionally wound, an adhesive such as an epoxy-based adhesive
having a high hardness is used to increase the Young's modulus E and the high frequency limit
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frequency fR. I have tried to make it bigger. However, the Young's modulus E was suppressed to
about 1.6 times the normal and the elongation of the high frequency fR to about 1.2 times only
by bonding with a hard adhesive. The present invention provides a ring-shaped bobbin
reinforcement on the inner peripheral surface of a voice coil bobbin and raises the Young's
modulus at the connection portion of the voice coil bobbin and the diaphragm to reproduce an
audio signal up to a higher frequency range. It provides a speaker.
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings. FIG. 2 shows a half sectional view of the speaker according to an embodiment of
the present invention, and the voice coil 9 is a voice when it is described with the same reference
numerals as in FIG. 1 showing a conventional example. It is fitted in a magnetic gap 12 formed
between the dog gear 4 and the center ball 1 in a state of being wound around the coil bobbin
10. On the other hand, the voice coil bobbin 10 is coupled to the central hole formed in the
middle fire portion of the damper 11, and the voice coil bobbin 1Q is bonded to the inner
diameter end of the diaphragm 8 on the outer peripheral surface. A feature of this embodiment is
that a ring-shaped bobbin reinforcement 14 made of metal, resin or the like is fitted to the inner
peripheral surface of the voice coil bobbin 10. This ring-shaped bobbin reinforcement 14 is
shown in FIG. As shown in b, a ring-shaped body 14a, a cross-shaped support 14b supporting the
ring-shaped body 14a from the inside, and an engaging body which protrudes from the ringshaped body 14a and whose tip is bent in an inverted U-shape outward It consists of 14c. The
ring-shaped body 14 a of the ring-shaped bobbin reinforcing member 14 is fitted on the inner
peripheral surface of the voice coil bobbin 10 corresponding to the back side of the contact
portion of the diaphragm 8 and the voice coil bobbin 10. Further, the tip end portion of the
engaging body 14 c is engaged with the upper end portion of the voice coil bobbin 10 so that the
ring-shaped bobbin reinforcement 14 does not slip downward along the inner peripheral surface
of the voice coil bobbin 10. As another embodiment of the ring-shaped bobbin reinforcing tool
14, as shown in FIGS. 4a and 4b, a ring-shaped support 14d is provided inside the ring-shaped
body 14a, and FIGS. 5a and 5b are provided. As shown, it is conceivable to provide a triangular
gap support 14e further supporting between the opposed grid points of the grid-like support 14c
of FIGS. 4a and 4b. The ring-shaped bobbin reinforcement 14 with the cruciform support 14b
shown in FIGS. 3a, b has the advantage of being constructed very simply and lightly. Ring-like
bobbin reinforcements 14 having lattice-like supports 14d and triangular clearance supports 14e
shown in FIGS. 4a and 4b and 5a and 5b have advantages of high mechanical strength and light
weight. . As described above, when the lightweight ring-shaped bobbin reinforcement 14 having
a large gap is provided on the inner peripheral surface of the voice coil bobbin 10, the vibration
of the diaphragm 8 is not reduced. Further, the respective gaps between the supports 14a, 14b
and 14C become air passages at the time of operation of the speaker, and air can be prevented
from being sealed in the speaker.
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In the speaker according to the above embodiment, the voice coil bobbin 1Q is reinforced by the
ring-shaped bobbin reinforcement 14 fitted on the inner circumferential surface, and the Young's
modulus E becomes large. Furthermore, as shown in FIG. 6, the voice coil bobbin 10a of the
speaker in the present embodiment maintains a substantially original circular shape even during
vibration. On the other hand, 10 b shows a plan view of the voice coil bobbin at the time of
operation of the conventional speaker, and since it vibrates in an elliptically deformed state, a
loss is caused to the diaphragm vibration. As described above, in the speaker according to the
present invention, the ring-shaped bobbin reinforcement is fitted to the inner peripheral surface
of the voice coil bobbin so as not to cause a deformation imaging motion which causes a loss of
imaging motion of the cone diaphragm. Fig. 7 shows how to measure the output sound pressure
frequency characteristics of the speaker, and Fig. 7 shows a characteristic curve of the speaker
not reinforcing the voice coil bobbin. Is a characteristic curve of a speaker using a high-hardness
adhesive as a reinforcement for the voice coil bobbin; 17 is a ring-shaped bobbin reinforcement
shown in the embodiment of the present invention; It can be seen that the region extends flat to a
high frequency range compared to 16. As described above, the speaker of the present invention
has a simple structure and an excellent effect, and is a dog of practical value.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a half sectional view of a conventional speaker, FIG. 2 is a half sectional view of the
speaker according to one embodiment of the present invention, and FIGS. 3a and 3b are plan
views of ring-like bobbin reinforcements which are main parts of the same speaker. Figure and
half sectional view, Figure 4a.
b (!: FIGS. 6a and 6b are plan and half sectional views of another embodiment of the same ringshaped bobbin reinforcement, and FIG. 6 is a plan view of the voice coil bobbin when the speaker
is in operation; The figure is a figure which shows the measurement result of the output sound
pressure frequency characteristic of a speaker. 6 Frame 8 diaphragms 9 voice coils 10 voice coil
bobbins 11 dampers 12 magnetic gaps 14 ring bobbin reinforcements 14 a ring bodies 14 b.
14d 14e--support, 14 cm-engagement body. Name of agent Attorney Nakao Toshio is one person
Figure 1? Figure 2 Figure 3 (set (b) (a) / b1 Figure 5 (a) (b)
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