close

Вход

Забыли?

вход по аккаунту

?

JPS5883498

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 JPS5883498
[0001]
The present invention relates to a flat loudspeaker having a flat diaphragm, and more
particularly to a flat loudspeaker having an improved connection between the diaphragm and a
voice coil bobbin. In a flat speaker having a flat diaphragm, when so-called node drive is adopted
in which the voice coil bobbin is connected to the portion inside the primary resonance that
occurs when the diaphragm is freely resonated, the diameter of the voice coil bobbin is the
diaphragm diameter Is about 0.68 times the Therefore, in the case of a flat loudspeaker for high
sound with a small diameter diaphragm, the diameter of the voice coil bobbin is about 14 mm
when the diaphragm diameter is 20, and the diameter of the voice coil bobbin is about 17 m1
when the diaphragm diameter is 25 mm. Become. On the other hand, the diameter of the pole
piece of the magnetic circuit located inside the voice coil bobbin without rubbing against the
voice coil bobbin is 1 (smaller than the diameter of the voice coil bobbin). However, if the
diameter of the pole piece is in the above-mentioned size, magnetic saturation occurs, the
efficiency of the magnetic circuit becomes worse, and it becomes difficult to obtain the required
magnetic flux density. Therefore, although the node drive is released, the voice coil bobbin is
connected near the outer periphery of the diaphragm to increase the diameter of the voice coil
bobbin and the pole piece of the magnetic circuit. In this case, the connection between the
diaphragm and the voice coil bobbin is conventionally as shown in FIG. 1 (in the figure, the
magnetic circuit, the frame, etc. are omitted). As shown in). That is, the voice coil bobbin 2
provided with the voice coil 4 is bonded to the surface material 1-2 on the back side of the
diaphragm 1 with an adhesive. Here, as a flat plate diaphragm, it is common to generally use a
sandwich structure having surface materials 1-1.1-2 on both sides of the core material 1-3 since
light weight and high rigidity are required. Then, the example of a sandwich structure is taken as
a diaphragm below. However, the content is the same even if it is a plate-shaped diaphragm. FIG.
2 schematically shows the structure of FIG. 1 and corresponds to a peripheral support type in
11-05-2019
1
which the diaphragm 1 is mounted on a support 5. FIG. Also, the one represented by the dotted
line in the figure shows the state when the diaphragm 1 vibrates. The shape of this vibration
approximately corresponds to the vibration of the peripheral support plate. Further, this
resonance frequency is lower than the resonance frequency of the peripheral fixed type plate
fixed to the fixed base 6 shown in FIG. Further, in FIG. 1, the support 3 supporting the vibration
system is joined to the surface material 1-1 of the diaphragm 1. Therefore, the diaphragm 1
repeats compression and tension between the voice coil bobbin 2 and the support 3.
Generally, foil-like metal, plastic or the like is used as the surface materials 1-L and 1-2 of the
diaphragm 1, and a honeycomb structure and foam material are used as the core material 1-3.
Here, the honeycomb structure core material and the surface material are in line bonding, and
most of the surface material is in a state like a drum skin. Further, the bonding between the foam
core and the surface material is a group of point bonds. Therefore, when tensile force is applied,
breakage of the surface material 1-1.1 = 2 may occur. As described above, in the prior art, the
diaphragm has a single-sided support structure and has a low resonance frequency due to its
single-sided support structure, and also has the disadvantage of causing breakage of the surface
material at large amplitudes. The need to do this has arisen. The object of the present invention is
to overcome the above-mentioned drawbacks of the prior art, and to increase the resonance
frequency of the diaphragm and to prevent the compression force and the tension exerted by the
voice coil bobbin and the support from being directly transmitted to the diaphragm. It is an
object of the present invention to provide a flat diaphragm type flat speaker in which breakage of
the diaphragm is prevented. In the present invention, in order to achieve the above object, a flat
speaker is configured with each point described below as a main point. That is, first, by inserting
the flat diaphragm into the inside of the voice coil bobbin, all of the surface material 1-1.1-2 and
the core material 1-3 constituting the diaphragm are joined to the voice coil bobbin, and the third
The peripheral fixed type as shown in the figure 'increases the resonant frequency of the
diaphragm. Second, the upper end of the voice coil bobbin is formed with an inner flange, and the
support is joined to this flange portion 9 so that the diaphragm is not compressed or tensioned,
and the diaphragm is Prevent the destruction of Third, a plurality of incisions are made from the
upper end of the voice coil bobbin to form strip-like tongues, and the tongues are alternately
joined to the front and back surface materials of the diaphragm to make the peripheral fixing
type stronger Make it Fourth, the bonding position of one of the tongues to be bonded to the
back surface material of the diaphragm is made closer to the center of the diaphragm to suppress
the resonance of the diaphragm and raise the resonance frequency. The above is the gist of the
present invention. . Hereinafter, various embodiments of the present invention will be described
using the drawings. [First Embodiment] FIG. 4 shows a cross section of the construction of this
embodiment. (In the figure, magnetic circuits, frames, etc. are omitted. 2.) In this embodiment,
the voice coil bobbin 2 is provided at its upper end portion with an inwardly directed collar 2a,
and the diaphragm 1 is bonded to the inside of the flange 2a. As a result, the state of the
diaphragm 1 becomes fixed at the periphery shown in FIG. 3, and the resonance frequency of the
11-05-2019
2
diaphragm becomes 20 to 30% higher than that of the conventional product.
By bonding the support member 3 to the portion of the voice coil bobbin 2 at the surface 2a of
the voice coil bobbin 2, the compressive force, the tensile force or the direct portion of the
diaphragm 1 is not added, so that the diaphragm 1 can be prevented from being broken. [Second
Embodiment] FIG. 5 shows a cross section of the construction of this embodiment. This
embodiment is an example in which the flange 2a of the voice coil bobbin 2 in the first
embodiment is not provided. In this case, since the reinforcement by the flange portion is not
performed, the increase of the resonance frequency of the diaphragm 1 is the first embodiment.
Slightly lower than in the case of the example, it is 15 to 20% higher than the conventional
product. However, even in this case, since the compressive force and the tensile force are not
directly applied to the diaphragm 1 by bonding the support 3 to the upper outer periphery of the
voice fill point 2, the breakage of the diaphragm 1 can be prevented. . [Third Embodiment] FIG. 6
shows a perspective view of the main part of this embodiment, and FIG. 7 shows the x-o-y cross
section of FIG. In both figures, the support 3 is omitted. Said 1st. As described in the second
embodiment, it is more preferable to provide a flange on the voice coil bobbin 2 and to bond this
flange portion to the surface material portion of the diaphragm 1 by increasing the resonance
frequency of the diaphragm or in this embodiment. The upper end portion of the voice coil
bobbin 2 is cut to provide a plurality of strip-like tongue portions 2b, and the tongue portions 2b
are alternately arranged on the upper surface material 1-1 of the diaphragm 1 and the lower
surface material 1 It is characterized in that it is bonded to -2. With such a structure, both
surfaces of the diaphragm 1 or the voice coil bobbin 2 are firmly bonded, and a more complete
peripheral fixed form is approached. The increase in resonance frequency in this case is about 25
to 30 in comparison with the conventional product. Fourth Embodiment FIG. 8 shows a cross
section of the structure of this embodiment. In the drawing, the support 3 is omitted or
abbreviated. In this embodiment, the position where the tongue 2b or the lower surface material
1-2 is joined in the third embodiment is changed to be closer to the center of the surface
material. In this manner, the tongue portion 2 b is increased to the resonance frequency
generated by the diaphragm 1. In this case, the resonant frequency of the diaphragm rises by
about 40 to 60% as compared with the conventional product. In each of the above-described
embodiments, the peripheral support type and the peripheral fixed type are described, but of
course the voice coil bobbin is joined to the support portion and the fixed portion, and it is
actually vibrating, The above term is used as a term representing the vibration mode of the
diaphragm. In the third and fourth embodiments, the support 3 is bonded to both the voice coil
bobbin 2 and the diaphragm 1 in the sixth and fourth embodiments. It is to be prevented.
As described above, according to the present invention, in the flat speaker, the resonance
frequency of the diaphragm is raised more than that of the conventional product, and a flat
diaphragm type flat speaker having a wide band can be realized. By bonding to the diaphragm, it
11-05-2019
3
is possible to prevent the diaphragm from being broken even with a large amplitude at the time
of a large input without applying a compressive force or a tensile force directly to the diaphragm.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a schematic cross-sectional view showing the structure of the vibration system of a
conventional flat speaker, FIG. 2 is a model view showing a support structure (peripheral support
structure) in the conventional flat speaker, and FIG. 3 is a peripheral fixed diaphragm FIG. 4 is a
schematic cross-sectional view showing the structure of the vibration system in the first and
second embodiments of the flat speaker according to the present invention, and FIG. 6 is a
vibration in the third embodiment. 7 is a schematic cross-sectional view showing the X-O-Y cross
section of FIG. 6, and FIG. 8 is a schematic cross-sectional view showing the structure of the
vibration system in the fourth embodiment. is there.
Explanation of symbols 1 иии Diaphragm 1-1.1-2 и и и Surface material 1-3 и и и Core material 2 и и и
Voice coil bobbin 2a и и и 2b и и и tongue portion 311. Support 4 иии Voice coil bobbin 5 и и и Support
base 6 и и и Fixed base 1 '4 figure 5 figure 16 figure off figure 8 figure' 1-1
11-05-2019
4
Документ
Категория
Без категории
Просмотров
0
Размер файла
13 Кб
Теги
jps5883498
1/--страниц
Пожаловаться на содержимое документа