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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
composite type speaker which incorporates a tweeter speaker for reproducing a high-pitched
part into a woo-speaker having a low-pitched part to obtain high-quality reproduced sound in a
wide band. Configuration of the prior art and its problems In general, a composite type speaker
configured to obtain a high-quality, wide-range reproduced sound by incorporating a tweeter
speaker for reproducing high-pitched sound into a woo-speaker that has a low-pitched sound.
There is no place to install a large number of speakers that have a band, and it has become a
topic in recent years in the field of car audio where it is required to cover all bands with one
speaker. In the audio field, from the viewpoint of sound image localization (it is considered that
the sound comes from the same direction), the speaker in which the woofer and the tweeter are
combined has a strong popularity. FIG. 1 shows a conventional composite speaker. In FIG. 1, 1 is
a diaphragm for woofer, 12 is a diaphragm end for woofer, 13 is a diaphragm dust cap for
woofer, 2 is a voice coil bobbin, 3 is a voice coil, 4 is a suspension for woofer diaphragm, 5 is for
woofer Magnetic circuit magnet, 6: magnetic circuit top plate for woofer, 14: lower plate, 7:
electrical terminal, 16: electrical terminal, 8: lead wire, 16: lead wire for O, 9: tweeter Lead wire
17; lead wire for tweeter ? 10: piezoelectric element for tweeter 11: diaphragm for tweeter 18:
tweeter diaphragm edge 18: 2o for speaker frame 21: for tweeter support frame 22 It is a
tweeter fixed pole. However, since the above-mentioned conventional composite type speaker
incorporates the tweeter unit in the cone portion of the woofer diaphragm, the speaker inevitably
becomes large, and it is difficult to make it thinner. There is a drawback that it is difficult to take
the method of ingesting the speaker, and there is still a problem that the structure is complicated,
the assembly operation takes time, and the number of parts is increased, resulting in an increase
in cost. 2 and 3 show an example of speaker characteristics and an electrical connection. In FIG.
2, the solid line is the sound pressure characteristic of the composite speaker, and the small
broken line and the large broken line are the reproduction characteristics of the woofer and
tweeter, respectively. Since the tweeter 23 is broken when the bass range signal is input, it is
usual to insert a capacitor in the series to shut off the bass range signal, but since the
piezoelectric element can be regarded as a kind of capacitor, the tweeter itself is the bass range
No capacitor is needed to have the characteristic of signal cut.
In FIG. 3, 24 is a woofer speaker, and 26 is a reproduction amplifier. SUMMARY OF THE
INVENTION The present invention is to solve such conventional drawbacks, and it is an object of
the present invention to provide a composite type speaker which is easy to combine at low cost,
is suitable for thinning, and can be highly efficient. It is The composite type loudspeaker of the
present invention is obtained by joining a piezoelectric element constituting a tweeter speaker to
a diaphragm for a woofer constituting a woofer speaker. According to this configuration, the
piezoelectric element emits sound as a tweeter in the high region where the impedance is small,
and has an advantage that it can be combined with the woofer speaker to realize a wide band
composite type speaker. Description of the Embodiments Hereinafter, embodiments of the
present invention will be described. FIG. 4 shows an embodiment of the present invention. In FIG.
4, 41 is a cone-shaped woofer diaphragm, 42 is a bobbin provided on the woofer diaphragm 41,
and 43 is a lower end of the povin 42. A voice coil sheet 44 wound around the outer periphery is
a suspension for supporting the woofer diaphragm 41 so as to allow piston movement so as to be
bridged with a frame 48 described later. 45 is an annular magnet, 46 is an upper plate, 47 is a
lower plate having a center pole, these are magnetic circuits having an annular magnetic gap
between the inner peripheral surface of the upper plate 46 and the outer peripheral surface of
the center pole Are configured. A frame 48 is attached to the upper plate 46 constituting the
magnetic circuit, and the suspension 44 is attached to the outer periphery of the woofer
diaphragm 41 with a gasket 49 via an edge member 6o. . Reference numeral 51 denotes a
piezoelectric element constituting a tweeter speaker, which is attached to the inner surface of the
woofer diaphragm 41. 53 and 54 are electrical terminals O and O provided on the frame 48 so
that an electrical signal can be applied to the piezoelectric element 61 and the voice coil 43
through the lead wire 55 and the lead wire 57 for O. There is. Here, the piezoelectric element 51
is made of a polymer film such as polyvinylidene fluoride and is adhered to the inner peripheral
surface of the woofer diaphragm 41 via a damping material 52 such as glass wool as shown in
FIG. . When the piezoelectric element 51 is thus formed into a film and attached to the woofer
diaphragm 41 via the damping member 52, the damping member 62 can reduce harmonic
distortion when the film as the piezoelectric element 51 vibrates. , Good quality reproduction of
the speaker can be performed. The piezoelectric element 51 is adhered to the diaphragm 41
between the damping members 62, and electric signal input terminals of {circle around (1)} and
?O? are formed to function as a capacitor tweeter.
The piezoelectric element 51 emits sound as a tweeter in a high frequency range where the
impedance is small, and can overlap with the woofer speaker by the diaphragm 41 or the like to
form a wide band composite type speaker. The piezoelectric element 51 may be attached to the
back surface of the diaphragm 41 where the sound release hole 56 is formed as shown in FIG. 6
as well as the inner surface of the diaphragm 41 via the braking plate 62, as shown in FIG. As
shown in the figure, the inside of the diaphragm 41 may be adhered and sandwiched.
Alternatively, the piezoelectric element 61 may be damped in the same manner as described
above on the dust cap 68 at the center of the diaphragm 41 as shown in FIG. It may be adhesive
via the material 52. In this case, by forming a tweeter on the dust cap 58, a coaxial composite
speaker is realized. Alternatively, the piezoelectric element 51 may be a solid piezoelectric
material such as shellac. In this case, as shown in FIG. 9, the piezoelectric element 51 is joined to
the diaphragm 41 and the tweeter diaphragm 59 is formed on the piezoelectric element 51. It is
good to join Thereby, the vibration of the piezoelectric element 61 can be efficiently radiated as a
sound. Alternatively, the piezoelectric element 51 made of a solid piezoelectric material may be
joined on the flat diaphragm 61 as shown in FIG. 10, and the dome diaphragm 6o may be joined
to the piezoelectric element 61. In this case, the function is not different from the cone type. In
FIG. 10, the junction cone 62 is joined to the voice coil bobbin 42 and transmits the driving force
to the diaphragm 61. In the present embodiment, the edge portion of the tweeter diaphragm 6 o
is joined to the driving plate 61. From this, it is possible to expand the tweeter's reproduction
band to a lower frequency. Effects of the Invention As described above, according to the present
invention, since the piezoelectric element constituting the tweeter is joined to a part of the
diaphragm for woon and the loudspeaker constituting the uno-speaker, it overlaps with the unospeaker. Thus, it is possible to obtain a very wide-band multi-speaker type speaker, and since
there is no need for a special magnetic circuit or pole for the tweeter speaker, there is an
advantage that it is possible to easily achieve thinning at low cost.
Brief description of the drawings
1 is a cross-sectional view of a conventional composite speaker, FIG. 2 is a sound pressure
frequency characteristic diagram of the same speaker, FIG. 3 is a circuit connection diagram of
the same speaker, and FIG. 4 is a composite speaker implementation of the present invention FIG.
6 is an enlarged perspective view of an essential part of the same speaker, FIG. 6, FIG. 7 and FIG.
8 are structural diagrams showing another embodiment of the same speaker, FIG. 9 and FIG.
These are sectional drawings which show the further another Example of the composite type
speaker of this invention.
41 ииииии Uno и Diaphragm, 51 иии и и и Piezoelectric element, 52 и и и и Damping material, 56 и и и и и и и и и и
и и и и и и и и и и и и и и и и и и 69 ... Diaphragm for tweeter, 61 ..... Plane diaphragm. Agent's Name Attorney
Nakao Toshio and 1 other person ? Figure 1 71 2 [71 second skin administration f Figure 3? 54
FIG. 5 FIG. 7 FIG. 6 FIG. 8 FIG. 9 FIG.
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