close

Вход

Забыли?

вход по аккаунту

?

JPH0290899

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 JPH0290899
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electrodynamic speaker, and more particularly to an electrodynamic speaker provided with a
driving voice coil and a boosting subcoil for driving another speaker. (Prior Art) As a
configuration example of a speaker system, a system using an electrodynamic type as a woofer
(speaker for bass) and a piezoelectric type for a tweeter (speaker for high sound) is well known.
An example of this prior art will be described with reference to the circuit diagram of FIG. In the
same, W is a woofer-3CA is a voice coil of woofer-W, TW is a tweeter, XT is a piezoelectric
element of tweeter TW. In this circuit, the audio signal output voltage from the main amplifier
(not shown) is directly applied to the voice coil CA of the woofer W and the piezoelectric element
XT of the tweeter TW. However, the manual impedance of the tweeter TW is very high, resulting
in the output impedance and mismatching of the main amplifier. Due to this mismatching, it is
not possible to supply sufficient power to the piezoelectric element XT. Therefore, the tweeter
TW can not sufficiently exhibit its performance, for example, it has a small sound output and can
have peaks and valleys on the frequency characteristic. An expensive bimorph (bi + norph) is
used as one of the amelioration of the bad effects due to this mismatching. Another conventional
example will be described with reference to the circuit diagram of FIG. In the figure, T is a
transformer, and r represents the voltage ratio applied to the piezoelectric element x'F of the
tweeter TW by voltage conversion, and the impedance of the matching element is the impedance
of the piezoelectric element XT of the tweeter TW as seen from the primary side. Is lowered.
Thus, the voltage supplied to the piezoelectric element XT is increased by using a transformer.
(Problems to be solved by the invention) However, using an expensive bimorph as a driving
element of the tweeter is advantageous in terms of the use of the piezoelectric speaker
characterized by its simple structure, light weight, and low cost. Moreover, using a transformer
increases the number of expensive parts, complicates the process, and causes instability in
07-05-2019
1
quality and an increase in price. The present invention has been proposed in view of the above,
and the object of the present invention is to adjust the impedance of another speaker with a
simple configuration in which a boost coil is wound around a voice coil of an electrodynamic
speaker. The purpose is to provide an electrodynamic speaker. (Means for Solving the Problems)
In order to achieve the above object, the present invention adopts a configuration in which a
boosting sub-coil for driving another speaker is wound around a speaker driving voice coil of-,
and more specifically The circuit configuration of a typical speaker system is as shown in FIG.
In the figure, CB is a sub coil. The other reference numerals are the same as in FIG. 3 and FIG. A
sub coil CB for boosting was connected to the voice coil CA of A woofer W in series. Both ends of
the voice coil CA of B woofer W were connected to the input terminal of the speaker system. The
input terminals of the piezoelectric element XT of the C tweeter TW were connected to both ends
of the voice coil CA and the sub coil CB. (Operation) As apparent from the above configuration,
according to the present invention, the output voltage of the main amplifier is applied to the
voice coil of the woofer as it is and driven in a state of matching. On the other hand, the output
voltage of the main amplifier boosted by the boosting action of the subcoil connected to the voice
coil of the woofer is applied to the input terminal of the tweeter. That is, it is the same operation
and effect as the acoustic conversion efficiency of the tweeter is enhanced using the matching
transformer. (Embodiment) In the following description of an embodiment of the present
invention as a composite speaker, and with reference to FIG. 1, an electrodynamic speaker
(Wooha-W) is known as shown in FIG. . A magnetic circuit 4 comprising a plate 3, a diaphragm 5,
and a frame 6 for mounting the magnetic circuit 4 and the diaphragm 5 etc. A coil bobbin 7 is
integrally coupled to the diaphragm 5 at the central portion of the diaphragm 5. It is done. A
piezoelectric speaker (tweeter TW) including the piezoelectric element XT and the diaphragm 8
is disposed on the front surface of the central portion of the diaphragm 5. That is, the
electrodynamic speaker (woofer-W) and the piezoelectric speaker (tweeter TW) are integrally
connected through the support 9, and the support 9 is connected to the central portion of the
yoke 1 and the piezoelectric speaker (tweeter). The frame 10 of TW) is fixed. ?????????
???????????????????????????????? Further, CA is a wooferW voice coil wound around the coil povin 7, CB is a subcoil, and a subcoil CB is wound in series
on the outer periphery of the voice coil CA. An input terminal 11 of the composite speaker is
connected to a voice coil CA of the woofer W via a tinsel wire 18. An input terminal 12 of the
tweeter TW is connected to both ends of the voice coil CA and the sub coil CB wound around the
coil bobbin 7 of the woofer W via tinsel wires 19 and to the piezoelectric element XT of the
tweeter TW. There is. Next, the operation will be described.
The power supplied to the input terminal 11 of the composite speaker drives the voice coil CA to
vibrate the diaphragm 5 fixed to the coil povin 7. In this case, since the impedances of the main
amplifier and the woofer W are matched, sufficient power is supplied from the main amplifier.
07-05-2019
2
Further, the input power of the tweeter TW is also sufficiently supplied by the boosting action of
the voice coil CA and the sub coil CB. In the embodiment, a speaker unit having a diameter of
1201 for the woofer, and a speaker unit using a piezoelectric element uimorph having a diameter
of 401 for the tweeter, is a composite speaker in which these units are assembled in a coaxial
type 2 way. . FIGS. 5 to 8 are experimental recordings of frequency characteristics showing
sound pressure at 2 V and 1 m for all inputs. Fig. 5 shows the frequency characteristics of the
tweeter alone, Fig. 6 shows the frequency characteristics of the woofer alone, Fig. 7 shows the
frequency characteristics of the composite speaker without using the subcoil, and Fig. 8 shows
the case of using the subcoil according to the present invention. It is a frequency characteristic,
and it can be seen that the sound pressure in the reproduction range of the 10 KHz to 20 KHz
tweeter is rising. In the above embodiments, the case where the piezoelectric speaker (Tweeter
TW) is integrally disposed at the center of the electrodynamic speaker (woofer W) has been
described, but the present invention is not limited to this. For example, the present invention is
also applied to the case where an electrodynamic speaker and a piezoelectric speaker are
separately provided, and further, although a case of a two-way system has been described as an
example as a composite speaker, it is also applicable to a three-way system Furthermore, in the
present embodiment, the case where the piezoelectric speaker is used as a high sound (tweeter)
has been described, but it is also possible to use another different operation principle, such as a
capacitor speaker. (Effects of the Invention) As described above, according to the present
invention, two or more speaker units having different impedances, for example, according to the
operation principle (dynamic voltage , Etc.), or can be used for adjustment in the case of different
efficiencies even with the same electrodynamic speaker. In addition, without using expensive
bimorphs or transformers, a great effect can be expected from the aspect of process control, 5
quality control, and 1 price control by improving the performance.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of a composite speaker according to the present invention, FIG. 2 is a
circuit diagram thereof, FIG. 3 and FIG. 4 are circuit diagrams in a conventional example, and FIG.
5 to FIG. It is explanatory drawing which shows the frequency characteristic of.
W
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
ииииииииииииииииииии Piezoelectric element T ииииииииииииииииииии Vibrator 7 of 7 и ... the coil bobbin 8 ... vibration
07-05-2019
3
plate +1 ... woofer tweeter - the input terminal 12 ... tweeter input terminals patent applicant
Foster @H Co., Ltd. representative patent attorney and high mountain road husband ( Outside 1
person) Figure Figure Figure Figure (Hz) (Hz)
07-05-2019
4
Документ
Категория
Без категории
Просмотров
0
Размер файла
12 Кб
Теги
jph0290899
1/--страниц
Пожаловаться на содержимое документа