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JPS56152481

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS56152481
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half-cut cross-sectional view showing a
composite type loudspeaker according to the prior art, FIG. 2 is a half-cut cross-section of the
composite-type loudspeaker according to the present invention, and FIG. The perspective view of
a damper is shown. DESCRIPTION OF SYMBOLS 1 ... Speaker for low-pitched sound 2 ... Speaker
3b ... Center pole 5: Bobbin 5a: voice coil 10: Spacer 12: bellows-like damper.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite type
loudspeaker which improves dustproofing to a magnetic gap of a bass loudspeaker. As this kind
of composite type speaker, as shown in FIG. 1, there is a ninety structure having a combination of
a low frequency speaker and a medium or high frequency speaker 2 other than a nuclear low
frequency speaker in a coaxial manner. That is, in the figure, reference numeral 3 is a magnetic
circuit of the low-pitch speaker, and the magnetic circuit 3 is composed of a yoke 3e for magnet
aas center pole 3bt-W and a plate 3d. Then, (1) / Round, the bobbin 5 & c with the voice coil 5a
positioned in the magnetic gap 4 has the central opening of the low frequency diaphragm 6 fixed
thereto, and the fixed portion and the frame 7 In between, a corrugation damper 8 is attached,
and an edge 9 is attached between the outer periphery of the low-frequency diaphragm 6 and
the frame 7. Above, the spacer 10 is fixed to the top of the center pole 3b by a screw, and at the
tip of the spacer 10, the speaker 2 of either one for medium sound or high sound for the screw is
coaxial with a screw. It is fixed. At the end of the spacer 10, two speakers 2 for medium and low
tones may be fixed in parallel. A corrugation damper 11 is attached between the outer periphery
of the spacer 10 and the low frequency diaphragm 6 to provide a dustproof function to the
magnetic gap 4. The above is the structure of the composite type speaker having the dustproof
function of the conventional example, but as described above, the corrugation damper in which
the dustproof function is attached to the relation between the outer periphery of the spacer 10
and the middle portion of the bass diaphragm 6 and (2) 11, the effective radiation area of the low
frequency diaphragm is reduced, and the efficiency is lowered. At the same time, the sound
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radiation from the corrugation damper 11 makes the low frequency sound worse and further the
low frequency diaphragm. Since the vibration of 6 is suppressed, the low frequency characteristic
is degraded. Father, when the low frequency diaphragm 6 has a small diameter and high power,
the dustproof corrugation damper 11 covers the entire low frequency imaging plate 6, so the
design, sound quality, and frequency characteristics There was also a problem. Therefore, in the
composite type speaker in which the speaker tube is fixed to the top of the center pole of the low
frequency speaker via the spacer via the spacer, the bellows is formed between the above spacer
and the neck portion of the diaphragm of the low frequency speaker. An object of the present
invention is to provide a composite type speaker having a dustproof function which solves the
problems of the pre-emption by attaching the dunha t-IIL9.
Hereinafter, detailed description will be made according to the embodiment of the present
invention. FIG. 2 is a cross-sectional view of the composite type speaker according to the present
invention. Therefore, the description of the structure will be omitted, and only the part related to
the present invention will be described below. In the figure, reference numeral 12 denotes a
bellows-like damper, and the bellows-like damper 12 is a cylindrical shape having a diameter
substantially the same as the diameter of the bobbin 5 and, as shown at 31st. A fold 12a is
formed in a serpentine shape. The lower end 12b of the bellows-like damper 12 is formed in a
cylindrical shape so as to be in close contact with the inner peripheral surface of the bobbin 5,
and the upper end 12c is in close contact with the lower surface of the flange 10m formed at the
tip of the spacer 10. It is bent in the shape of a ring towards you. The lower end 12bt of the
above-mentioned bellows-like damper 12 is q q! On the circumferential surface of the bobbin 50
at the neck portion where the bass diaphragm 6 and the bobbin 5 are fixed. (i) Fixing foot 1 The
lake 12c is tightly fixed to the lower surface of the flange 10m, thereby interposing between the
bellows-like damper 12t povin 5 and the spacer 10 (Z). In the illustrated embodiment, the
bellows-like damper 121t is fixed at its lower end 12b to the inner peripheral surface of the
bobbin 5 (4) tightly, but it may be fixed to the diaphragm 6 at a portion where the diaphragm 6
and the bobbin are closely adhered. Further, the upper end 12 e of the bellows-like damper 12
may be fixed to the outer peripheral surface of the spacer 10, and the point is that the spacer 10
and the bass speaker 1 can be extended so that the bellows-like damper 12 can expand and
contract in the axial center direction of the spacer 10. It may be connected between the
diaphragm and the neck of the diaphragm. The present invention is a composite type speaker in
which the speaker 2 other than the low-pitched speaker is fixed to the top of the center pole 3b
of the low-pitched speaker 1 via the spacer 101 as described above. The bellows-like damper 12
can be attached to the magnetic gap 4 of the bass speaker 1 to provide a dustproof function, and
the radiation direction of the bass diaphragm 6 is It is not hampered in any way, and the sound
of the bass is well removed in terms of hearing, and the bellows-like damper 12 is mounted so as
to be extensible and contractible in the axial center direction of the spacer 10. The amplitude is
not limited, so that the low-pass characteristic is not inferior (5). Furthermore, since the bellowslike damper 12 is attached regardless of the bass diaphragm 6, it is particularly small It is
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effective when applied to a diameter high-power models.
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