JP2001238285

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DESCRIPTION JP2001238285
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
hybrid speaker including a piezoelectric vibrator and a conductive vibrator.
[0002]
A speaker provided with a piezoelectric diaphragm is known as a sound source of a speaker
system. For example, Japanese Utility Model Registration No. 3037167 filed by the present
applicant discloses a speaker structure using a piezoelectric element such as a bimorph as a
sound source of a speaker system. In this speaker, a piezoelectric diaphragm is attached to an
acoustic diaphragm made of a fiber reinforced plastic such as carbon fiber to make a sound
source of the speaker.
[0003]
Although the piezoelectric diaphragm is excellent in particularly high-pitched sound
characteristics, however, the amplitude of the piezoelectric diaphragm is small, so it is difficult to
sufficiently increase the sound pressure of bass using the piezoelectric diaphragm. Met.
[0004]
According to the present invention, there is provided a hybrid type comprising a piezoelectric
vibrator and a conductive vibrator attached to an acoustic diaphragm through a high-pitch
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primary diaphragm and a low-pitch primary vibrator. In the speaker, the piezoelectric vibrator is
attached to the high-tone primary diaphragm through the connecting member at the center
portion thereof, and the conductive vibrator has a voice coil disposed around the magnetic
vibrator in the housing. And a hybrid type speaker in which a magnetic vibrator is reciprocably
attached to a housing.
[0005]
DESCRIPTION OF THE PREFERRED EMBODIMENTS First, referring to FIG. 1, a first embodiment
of the present invention will be described.
The speaker 10 according to the first embodiment includes the piezoelectric vibrator 16 attached
to the acoustic diaphragm 12 via the high-tone primary diaphragm 14.
The high-tone primary diaphragm 14 is attached to one side of the acoustic diaphragm 12 by an
adhesive. The piezoelectric vibrating body 16 is provided with a piezoelectric vibrating plate 16b
in which a ceramic layer is formed on both sides of a circular thin plate made of metal such as
aluminum or stainless steel. The piezoelectric diaphragm 16b is attached to the high-tone
primary diaphragm 14 with an adhesive or the like at a central portion thereof via the connecting
member 16a. The acoustic diaphragm 12 is preferably made of gypsum board or expanded
polystyrene and has a thickness of at least 5 mm, more preferably 10 mm to 20 mm.
[0006]
In the acoustic diaphragm 12, the conductive vibrator 20 is attached to the same side as the side
to which the piezoelectric vibrator 16 is attached via the low-pitch primary diaphragm 18. The
low-pitch primary diaphragm 18 can be formed of a relatively hard thin plate made of the same
material as the high-tone primary diaphragm 14. The conductive vibrator 20 includes a
permanent magnet 20b as a magnetic vibrator provided so as to reciprocate in the direction
perpendicular to the acoustic diaphragm 12 in the housing 20a, and a voice disposed around the
permanent magnet 20b. A coil 20c and a frame 20d for supporting the housing 20a are
provided. The conductive vibrator 20 is attached to the low frequency primary diaphragm 18 by
a plurality of screws 20 e.
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[0007]
Next, a second embodiment of the present invention will be described with reference to FIG. The
speaker 30 according to the second embodiment of the present invention includes the
piezoelectric vibrator 16 attached to the acoustic diaphragm 12 via the high-tone primary
diaphragm 14 and the low-pitch primary diaphragm 18, and the conductive vibrator 32.
Equipped with In the second embodiment, the high-tone primary diaphragm 14, the low-pitch
primary diaphragm 18, and the piezoelectric vibrator 16 are configured in the same manner as in
the first embodiment. In the second embodiment, the conductive vibrator 32 comprises a
permanent magnet 32b as a magnetic vibrator provided so as to be capable of reciprocating in
the vertical direction with respect to the acoustic diaphragm 12 in the bottomed housing 32a;
And a voice coil 32c disposed around the magnet 32b. The housing 32a has a flange 32e along
the opening facing the primary vibration plate 18 in the housing 32a, and the housing 32a is
attached to the primary vibration plate 18 by the flange 32e. There is. The housing 32a can be
attached to the low frequency primary diaphragm 18 with a plurality of screws (not shown)
similar to the first embodiment (not shown) or a suitable adhesive.
[0008]
According to the present invention, it is possible to improve the bass characteristic of a speaker
using a piezoelectric vibrator and to increase the sound pressure in the bass range.
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