close

Вход

Забыли?

вход по аккаунту

?

JPS63279700

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS63279700
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker provided to an electric sound V device, and more particularly to a composite speaker
having an electrodynamic structure. 2. Description of the Related Art In general, it is desirable for
a single unit to be able to reproduce sound in the widest possible frequency band as a speaker.
For this reason, a speaker unit of a full range specification, a coaxial spy force unit in which a
woofer portion and a tweeter portion are coaxially arranged, and the like have been
conventionally proposed. [Problems to be Solved by the Invention] However, in the speaker unit
of the full range specification, it is practically difficult to have the ability to cover the entire audio
frequency band, and it is also difficult to design. There is a problem. On the other hand, in the
coaxial speaker unit, its structure is extremely complicated, and has a disadvantage that the
design cost and the manufacturing cost become expensive. (Means for Solving the Problems) In
order to solve the above-mentioned conventional problems, the composite type speaker of the
present invention is provided with a voice coil which vibrates according to a change of the audio
signal, and a peripheral portion fixed. In a speaker including a diaphragm that vibrates in
conjunction with the voice coil, the diaphragm is formed of a piezoelectric film that expands and
contracts according to a change in an audio signal, and a diaphragm of the voice coil and the
piezoelectric film It is characterized in that it is set to input an audio signal to both sides.
[Operation] In the above configuration, when an audio signal is input to the voice coil,
displacement occurs in the voice coil due to the electromagnetic induction action, and a vibration
corresponding to a change in the audio signal is generated. When this vibration is transmitted to
the diaphragm of the piezoelectric film, the piezoelectric film diaphragm vibrates and a sound is
emitted. Here, according to this vibration system, since vibration of sufficient amplitude can be
obtained over the whole of the piezoelectric film diaphragm, the bass region can be reproduced
well. On the other hand, when an audio signal is input to the piezoelectric film diaphragm, the
07-05-2019
1
piezoelectric film diaphragm performs an expansion and contraction motion according to the
applied voltage of the audio signal. The expansion and contraction movement of the piezoelectric
film diaphragm is converted into vibration in the direction perpendicular to the surface direction
of the piezoelectric film diaphragm by providing the peripheral portion of the piezoelectric film
diaphragm in a fixed state, and the sound signal is generated by this vibration. The sound
according to is emitted. In this case, although the vibration with a large amplitude can not be
obtained, the piezoelectric film has the characteristic of being excellent in the following
performance when a high frequency is input, so that the middle and high frequency range can be
reproduced well. be able to.
As described above, since the sound old information obtained by the two vibration systems is
temporarily distributed from the bass to the high sound by the characteristics of each vibration
system, high-quality reproduced sound can be obtained in a wide frequency band. . Embodiment
1 One embodiment of the present invention will be described below with reference to FIG. In the
composite speaker 1 according to the present embodiment, the magnetic circuit 2 is configured
by the yoke 3, the magnet 4 and the top plate 5. A gap portion 6 is formed which forms a
magnetic flux concentration portion by the peripheral surface of the central protruding portion 3
a of the yoke 3 and the inner peripheral surface of the top plate 5. A voice coil 7 that vibrates in
accordance with a change in the audio signal is disposed in the gap portion 6, and a dynamic
portion terminal 8 for inputting the audio signal is disposed in the voice coil 7 via the drive cone
9. It is connected. The drive cone 9 has a generally bowl shape, and the peripheral edge on the
smaller diameter side is connected to the voice coil 7, while the peripheral edge on the larger
diameter side is connected to the rear end surface of the diaphragm fixing ring 10. The
diaphragm fixing ring 10 is fixed to a support 12 a formed on the front edge of the frame 12.
Further, a peripheral edge portion of a reverse dome type diaphragm (hereinafter referred to as a
piezoelectric film diaphragm) 11 formed of a piezoelectric film is fixed to the diaphragm fixing
ring 10. A piezoelectric film electrode 13 is provided at the bottom of the piezoelectric film
diaphragm 11, and a piezoelectric portion terminal 14 for inputting an audio signal is connected
to the piezoelectric film electrode 13 via the drive cone 9. As described above, in the composite
type speaker 1 of the present invention, audio signals are set to be input to both of the
piezoelectric film diaphragm 11 and the voice coil 7 constituting the dynamic power unit. In the
above configuration, when a voice signal is input to the voice coil 7, displacement occurs in the
voice coil 7 by an electromagnetic induction action, and a vibration corresponding to a change in
the voice signal is generated. The vibration is transmitted to the diaphragm fixing ring 10 by the
drive cone 9 and further transmitted to the piezoelectric film diaphragm 11 through the
diaphragm fixing ring 10. As a result, the piezoelectric film diaphragm 11 vibrates, and a
compression wave is generated in the air around it, and a sound is emitted. Here, according to
the vibration system of the electrodynamic part, since vibration of sufficient amplitude can be
obtained over the whole of the piezoelectric film vibration ItIill, the bass region can be
reproduced well. On the other hand, when an audio signal input from the piezoelectric portion
07-05-2019
2
terminal 14 is applied to the piezoelectric film electrode 13, the piezoelectric film diaphragm 11
stretches and contracts in accordance with the audio signal.
Since the peripheral portion of the piezoelectric film diaphragm 11 is fixed to the diaphragm
fixing ring 10, the expansion and contraction motion is converted into vibration in a direction
perpendicular to the surface direction of the piezoelectric film diaphragm 11, and this vibration
converts it into an audio signal. A corresponding sound is generated. In this case, although the
vibration with a large amplitude can not be obtained, the piezoelectric film has the characteristic
of being excellent in the following performance when a high frequency is input, so that the
middle and high frequency range can be reproduced well. It becomes possible. As described
above, since the acoustic information obtained by the two vibration systems is temporarily
distributed from the low tone to the high tone due to the characteristics of the vibration system,
high-quality reproduced sound can be obtained in a wide frequency band. Further, the acoustic
information obtained by the two types of vibration systems is one in which the sound source is
one as generated by the piezoelectric film diaphragm 11, and therefore the structure is extremely
simple and the design cost And manufacturing costs can be reduced. [Embodiment 2] Another
embodiment of the present invention will be described below with reference to FIGS. 2 and 3.
The same reference numerals are appended to members having the same functions as in the first
embodiment. The composite type loudspeaker according to this embodiment is obtained by
directly attaching the piezoelectric film diaphragm 11 with the drive cone and the diaphragm
fixing ring omitted in the first embodiment. That is, in the cone-shaped piezoelectric film
diaphragm 11, the large diameter side peripheral portion is fixed to the support portion 12 a of
the frame 12, while the small diameter side peripheral portion is connected to the voice coil 7.
Further, as shown in FIG. 3, a drive circuit 15 is provided in order to supply an audio signal to
the electrodynamic part terminal 8 and the piezoelectric part terminal 14. The drive circuit 15
includes an audio signal generation unit 16, a constant voltage amplifier 17 for amplifying an
audio signal, a step-up transformer 18, and a low pass network filter 19; An audio signal is
supplied to each of the piezoelectric unit terminals 14 through a low pass network filter 19
through a transformer 18. In the above configuration, the piezoelectric film diaphragm 11
directly receives vibration of the voice coil 7 and vibrates. At this time, vibration of a sufficient
amplitude can be obtained over the entire piezoelectric film diaphragm 11, so that the bass
region can be reproduced well. On the other hand, since the peripheral portion of the
piezoelectric film diaphragm 11 is fixed to the support 12 a of the frame 12 and the voice coil 7,
the expansion and contraction movement of the piezoelectric film diaphragm 11 is perpendicular
to the surface direction of the piezoelectric film diaphragm 11. It is converted to vibration in a
positive direction, and this vibration emits a sound corresponding to the audio signal.
Therefore, as in the first embodiment, it is possible to satisfactorily reproduce the middle and
high tone range. The step-up transformer 18 and the low pass network filter 19 can be omitted
07-05-2019
3
or replaced with other circuits according to the design of the two types of vibration systems.
[Effects of the Invention] As described above, in the composite type speaker according to the
present invention, the voice coil that vibrates according to the change of the audio signal, and the
diaphragm whose peripheral portion is provided in a fixed state and vibrates in conjunction with
the voice coil. The speaker is provided with a piezoelectric film that expands and contracts in
response to a change in audio signal, and the audio signal is input to both the voice coil and the
diaphragm of the piezoelectric film. With this configuration, sound can be generated by two
vibration systems. And since the acoustic information obtained by these two types of vibration
systems is distributed temporarily from the low range to the high range due to the characteristics
of the respective vibration systems, high-quality reproduced sound can be obtained in a wide
frequency band. In addition, the sound information obtained by the two types of vibration
systems is both generated by the diaphragm of the piezoelectric film and the sound source is one,
so the structure is extremely simple, and the design cost and manufacture The effect that the cost
can be significantly reduced is also achieved.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of a composite speaker showing one embodiment of the present
invention, FIG. 2 is a cross-sectional view of a composite speaker showing another embodiment
of the present invention, and FIG. 3 is a drive circuit of the composite speaker. It is a circuit
diagram shown.
1 is a composite speaker, 2 is a magnetic circuit, 7 is a voice coil, 8 is a moving part terminal, 11
is a piezoelectric film diaphragm, 14 is a piezoelectric part terminal, and 15 is a drive circuit.
07-05-2019
4
Документ
Категория
Без категории
Просмотров
0
Размер файла
13 Кб
Теги
jps63279700
1/--страниц
Пожаловаться на содержимое документа