JPS59139787

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DESCRIPTION JPS59139787
[0001]
The present invention relates to a composite speaker which is simple in construction, easy to
assemble, can be miniaturized, and is inexpensive. FIG. 1 shows a conventional composite
speaker. It was configured as shown in FIG. First, a frame 6 is coupled to a magnetic circuit 6
constituted by a plate 2 having a center pole 1, a ring-shaped magnet 3 and a ring-shaped upper
plate 4 as shown in FIG. The peripheral portion of the edge 9 of the diaphragm 8 is fixed
together with the gasket 7 to the portion, the voice coil 10 is coupled to the central portion of the
diaphragm 8, the middle portion of the voice coil 1o is held by the damper 11, and the voice coil
10 is The main speaker 14 is formed by sticking the lower portion of the magnetic circuit 12 of
the magnetic circuit 6 without eccentricity, and the dust cap 13 is attached to the upper center of
the diaphragm 8 and fixed to the peripheral portion of the frame 6 of the main speaker 14 The
small second speaker 16 is attached to the center of the support plate 16 having the sound
emission holes. The conventional example shown in FIG. 2 has the same configuration as that of
FIG. 1 as the main speaker 14, and a support 17 is provided on the upper surface of the center
pole 1 of the main speaker 14, and a small second The speaker 16 is attached and configured. As
described above, the composite type speaker in the related art is configured to dispose the small
second speaker 16 on the front surface of the diaphragm 8 of the main speaker 14, and the
support plate 16 for supporting the second speaker 16 is used. In addition, the number of parts
has to be increased, the number of parts is increased, the assembly is time-consuming, the cost is
disadvantageous, and there is a drawback that a large restriction is added when the whole is
miniaturized. The present invention eliminates the above-mentioned conventional drawbacks. An
embodiment of the present invention will be described below with reference to FIGS. Referring to
the embodiment shown in FIG. 3, 18 is a magnetic circuit, and this magnetic circuit 18 is
externally magnetized by a plate 2o having a center pole 19, a ring-shaped magnet 21 and a
ring-shaped upper plate 22. It is configured. A frame 23 is connected to the magnetic circuit 18,
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a peripheral portion of a diaphragm 24 is connected to a peripheral portion of the frame 23
together with a gasket 24, and a voice coil 26 is connected to a central portion of the diaphragm
26. The middle part of the voice coil 26 is held by a damper 27 and the lower part of the voice
coil 26 is fitted into the magnetic gap 28 of the magnetic circuit 18 without eccentricity.
A dust cap 29 is attached to the upper surface of the central portion of the diaphragm 25 and the
upper end of the voice coil 26. The above configuration constitutes the main speaker 3 o, and the
small second speaker 31 is incorporated on the frame 23 on the back surface of the diaphragm
25 of the main speaker 30. The sound of the second speaker 31 is configured to be radiated
through the diaphragm 25. In the embodiment shown in FIG. 4, 32 is a magnetic circuit, and the
magnetic circuit 32 is constructed in an inner magnet type by incorporating a laminated body of
a columnar magnet 34 and a pole piece 36 at the center of the yoke 33. ing. In the magnetic
circuit 32, a few frames 36 are formed, and at the periphery of the frame 36, the periphery of the
diaphragm 3 is fixed, such as three 1... A voice coil 39, which is embedded in the magnetic gap
38 of the magnetic circuit 32, is coupled to the lower surface of the diaphragm 37 to constitute a
main speaker 4o. A monomorph type piezoelectric type in which an electrode plate 42.4'3 is
coupled to both surfaces of the piezoelectric ceramic plate 41 as shown in FIGS. 5 and 6 on the
top surface of the pole piece 35 of the main speaker 4o. A speaker 44 is incorporated as a
second speaker. The piezoelectric speaker 44 may be of a bimorph type. Still using the main
speaker 40 of the embodiment shown in FIG. 4, the one shown in FIG. 7 uses the diaphragm 37
as the second speaker as shown in FIG. 8 and FIG. In the embodiment, the top of the frame 36 on
the back side of the In the piezoelectric speaker 45 shown in FIGS. 8 and 9, the ring-shaped
piezoelectric ceramic plate 47.48 is attached to the upper and lower surfaces of the ring-shaped
common electrode plate 46, and the electrode 4960 is formed on the outer surface of the
piezoelectric ceramic plate 47.48. The bimorph type provided is shown. As described above, the
composite speaker according to the present invention can be configured, and the second speaker
can be incorporated into the frame of the main speaker or a part of the magnetic circuit. There
are no parts, the number of parts is reduced, the number of assembly processes is small, the
mass productivity is excellent, and it is advantageous in cost as well as it can be miniaturized as a
whole. Without being received, it is a dog of practical value.
[0002]
Brief description of the drawings
[0003]
1 and 2 are sectional views showing a conventional composite speaker, FIG. 3 is a sectional view
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showing one embodiment of the composite speaker of the present invention, and FIG. 4 is a
composite speaker of another embodiment. 5 is a perspective view of the piezoelectric speaker
incorporated into the composite speaker, FIG. 6 is a front view of the piezoelectric speaker, and
FIG. 7 is a cross sectional view showing still another composite speaker, FIG. FIG. 9 is a front view
of a piezoelectric speaker used in the composite speaker, and FIG. 9 is a perspective view of the
piezoelectric speaker.
18 ...... m magnetic circuit, 23 ..... frame, 25 ..... diaphragm 26 ...... voice coil, 2B ----- magnetic gap,
30 ... · · · · · Main speaker, 31 · · · Second speaker, 32 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · diaphragm ··· Magnetic gap, 39 · · · · · · Voice coil, 4 o · · · · · Main speaker, 44 ° 46 · ·
· · Piezoelectric type speaker. Name of Agent Attorney Nakao Toshio and others 1 person Figure
1 Figure 5; 6 Figure Δ 11 Figure 7 Figure 9 Δ Q
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