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JPS56132890

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS56132890
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of the inventive speaker,
FIG. 2 is a connection diagram of the inventive speaker, and FIG. 3 is a frequency characteristic
diagram of the inventive speaker. W is a speaker for bass, S is a speaker for middle tone, T is a
speaker for high tone, ds and dz are axial intervals, ■ is the speed of sound in the air, f, if2 is a
crossover frequency, and 8.15 is a diaphragm.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an in-vehicle
composite speaker in which a bass speaker and a mid-tone speaker 732J'7θ2 high-tone speaker
are coaxially arranged to form a 3-way speaker, a unit and a unit. . Conventionally, in the case of
an in-vehicle speaker, the speaker is often buried at the top of the rear trunk of the rear seat. In
this case, the listener is required to improve the directivity in the horizontal direction. The
present invention was devised to meet the above requirements, and one embodiment shown in
the drawings will be described. As shown in FIG. 1, a magnetic circuit is constituted by the center
pole 2, the magnet 3 and the plate 4 as shown in FIG. A magnetic gear is formed by the center
pole 2 and the plate 4, a voice coil 60 winding portion is disposed at the center of the magnetic
cap, and a damper 7 is attached to the outer rim of the frame 5 attached to the upper surface of
the plate 4 The voice coil 6 is held at the center, the voice coil 6 is held at the center of the
frusto-conical diaphragm 8, the outer edge of the diaphragm 8 is attached to the outer edge of
the frame 5, and the arrow Paste the paper 10 to make a bass speaker-W. The support pole 1 is
coupled and fixed to the upper surface of the center pole 2, and the support yoke 11 of the
medium sound speaker is held with the three support posts l. Stick to A magnet 12 is attached to
the inner bottom center of the yoke 11 and a magnetic gap is formed by the yoke 11 and the
magnet 12. A winding of the voice coil 16 is disposed at the center of the magnetic gap. Distance
between the frame 13 and the diaphragm of the low-frequency speaker, which is fixed so as to
satisfy the condition of “#”, “” “DITV / 4f +”. In the case of the crossover frequency of the
speaker W for low tone and the speaker S for mid tone, since DIH is 5000 H 2, DI is 17 ′) c or
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less. The voice coil 16 is held in the center by a damper 14 whose outer edge is attached to the
inner bottom of the frame 13, and the voice coil 16 is held at the center of the frusto-conical
diaphragm 15. The outer edge of the pedestal 17 is joined and fixed to the outer edge of the
frame 13, and the dustproof cage 18 is attached to the upper end of the voice coil 16 to make
the mid-tone speaker S. The receiver is fixed to the upper end of the table 17 by the 7th ring 19
of the high sound speaker T, and the axial distance between the frame 19 and the diaphragm 15
of the medium sound speaker S etc. D2: V / 4f2 is arranged so as to satisfy the condition, in this
case V is 340 rn / s, f2 is the crossover frequency of the middle sound speaker S and the high
sound speaker T in this case, it is 10000 Hz, so D2 Is less than & 5 nil.
The ceramic 20 is suspended at the center of the frusto-conical diaphragm 21, the outer
periphery of the diaphragm 21 is attached to the outer periphery of the frame 19, and the
dustproof cap 22 is attached to the center of the moving plate. A ceramic tweeter as a speaker T
is coaxially arranged, and as shown in FIG. 2, a middle sound speaker 8 and a high sound speaker
T are connected in parallel with the low sound speaker W, and the middle sound speaker is an
individual. 4 □ = F (1) ry de, “A go C is a composite speaker configured by connecting in series.
The five-invention embodiment is structured as described above, in which the bass speaker W1
the mid-tone speaker 5 and the high-tone speaker r are coaxially arranged, and the mid-tone
speaker S is the sound diffusion of the bass speaker W The high-tone speaker T is used as an
acoustic diffuser of the mid-tone speaker S to improve the directivity characteristic in the
horizontal direction. What is shown in FIG. 3 is an example of the frequency characteristic, and
the dotted line shown in the dotted line is the speaker axis when the low sound speaker is
attached to the lower office speaker and the high frequency band operates up and down with the
frequency characteristic in the 60 ° direction gradually. The frequency characteristics of the
speaker axis and the direction of the 60 ° direction when the speaker for middle tone and the
speaker for high tone are attached to the speaker for low tone are shown in the solid line, and the
curve is a gentle curve while maintaining high sound pressure Is shown. The diaphragm 7 is
supported at two points by the damper 7 and the damper 9 to prevent the rolling phenomenon.
The same effect can be obtained not only with the ceramic and tweeter but also with the cone
type tweeter having a magnetic circuit. 6
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