close

Вход

Забыли?

вход по аккаунту

?

JPH04371098

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 JPH04371098
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
cone type speaker.
[0002]
2. Description of the Related Art As is well known, a cone type speaker has a cap at a central
portion of a cone-shaped diaphragm so as to prevent iron powder and dust from entering the air
gap of the magnetic circuit. Provided. A small hole is made in the center of the cap, and the small
hole is covered with a coarse cloth or the like to maintain air permeability, and the air in the
small air chamber surrounded by the cap, voice coil bobbin, and pole It does not interfere with
the movement of the diaphragm. Reference: Hirajima Nakataro "Hi-Fi Speaker", published by
Japan Broadcasting Corporation, Japan
[0003]
However, as described above, in the conventional method of making small holes in the cap and
putting a coarse cloth etc. on the cap, the number of working man-hours increases and the price
of the cap is increased. There was a problem of rising. Furthermore, in the case of a relatively
small speaker such as a full-range speaker capable of reproducing the whole range with one, or a
tweeter or squawker dedicated to middle and high range when reproducing the whole range with
11-05-2019
1
two or more, the cap The size of the cap is also reduced, making the operation of the
conventional method difficult, and there is also a problem that the manufacturing quality of the
cap may be degraded.
[0004]
[0004] In view of the foregoing, it is an object of the present invention to provide a cone type
speaker which is easy to manufacture and uses a cap having a suitable level of air permeability to
suppress the price increase while having excellent reproduction characteristics in the middle to
high range. Where to provide.
[0005]
According to the present invention, there is provided a cone-shaped speaker (10) having a cap
(16) at the center of a cone-shaped diaphragm (13) coupled to a voice coil (11). This is a cone
type speaker in which the cap is formed from paper pulp and the paper density of the cap is
reduced at the central portion (16i).
[0006]
According to such a configuration, it is possible to easily manufacture a cap having appropriate
air permeability, to suppress the price increase and to obtain excellent reproduction
characteristics, particularly in the middle to high range. .
[0007]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment in which a cone
type loudspeaker according to the present invention is applied to a full range type loudspeaker
will be described below with reference to FIGS.
[0008]
The configuration of the main part of one embodiment of the present invention is shown in FIG.
1, and the entire configuration is shown in FIG.
In FIG. 2, 10 is a speaker, and the top of a conical diaphragm 13 is connected to the middle of a
bobbin 12 on which a voice coil 11 is wound at one end, and the main part of the vibration
system is configured. Be done.
11-05-2019
2
The diameter of the diaphragm 13 is, for example, about 60 mm.
A magnetic circuit 20 is formed of a magnet 21, a plate 22 and a yoke 23.
The edge 14 is interposed between the frame 24 fixed to the plate 22 and the peripheral edge of
the diaphragm 13, and the damper 15 is interposed between the frame 24 and the bobbin 12 so
that the voice coil 11 is in the magnetic circuit 20. The vibration system is supported so as to be
disposed at a predetermined position of
[0009]
In this embodiment, a pulp based center cap 16 is adhered to the other end of the bobbin 12. As
also shown in FIG. 1, a recess 16i is formed in the central portion of the center cap 16, and the
recess 16i is thinner than the peripheral portion 16o by the separation at the time of paper
making, and appropriate air permeability is maintained. . When combined with the diaphragm 13
having the above-described aperture, the outer diameter Do of the center cap 16 and the
diameter Di of the recess 16i are set, for example, as follows. Do=21mm,Di=12mm
[0010]
The center cap 16 of this embodiment is formed by using a web 1 as shown in FIG. The fine mesh
1 is, for example, as fine as about 50 to 80 mesh, and a recess 2 is formed such that the center
cap 16 in FIG. 1 is vertically inverted. A protrusion 2 cx is formed at the center of the recess 2. Is
provided. And the thin tube 3 is provided below this convex part 2cx.
[0011]
First, when a predetermined amount of pulp solution is injected into the recess 2 of the screening
net 1, the outer lower end of the recess 2 and the upper end of the thin tube 3 are in close
contact, and the vacuum pump (not shown) Strong on the outside, weak on the inside, sucked
and dehydrated respectively. At this time, since a large amount of pulp collects on the stronger
11-05-2019
3
suction side, that is, on the outer peripheral portion of the recess 2 facing the outside of the thin
tube 3, the suction force is appropriately controlled so as to obtain the required paper density
ratio. Then, it is formed into a predetermined shape by press working. By the process as
described above, it is easy to control the paper making density of the central portion 16i of the
center cap 16 to a small degree as desired, and appropriate air permeability can be secured in
the central portion 16i.
[0012]
In this embodiment, when the papermaking density ratio of the center cap is, for example, about
1: 4, the sound pressure frequency characteristic of the speaker is as shown in FIG. On the other
hand, when the papermaking density of the center cap is uniform and there is no air
permeability, the sound pressure frequency characteristic of the speaker is as shown in FIG. For
convenience of comparison, the frequency characteristics of the middle to high frequency range
of FIG. 5 are shown by broken lines in FIG. As apparent from FIGS. 4 and 5, in the loudspeaker of
this embodiment, the peaks and valleys of the frequency characteristic of the middle to high
frequency range become smaller, and the quality of the reproduced sound is superior in hearing
sense.
[0013]
In the above-described embodiment, the present invention has been described as being applied to
a full-range type speaker. However, the present invention can be applied to tweeters or
squawkers as well.
[0014]
As described above, according to the present invention, the center cap of the cone type speaker is
formed from paper pulp, and the paper density in the central portion is reduced by the
separation at the time of paper making. As a result, a center cap having appropriate ventilation
can be easily manufactured, price increase can be suppressed, and a cone-shaped speaker having
excellent reproduction characteristics in the middle to high range can be obtained.
[0015]
Brief description of the drawings
[0016]
11-05-2019
4
1 is a cross-sectional view showing the configuration of the main part of an embodiment of a
cone type loudspeaker according to the present invention
[0017]
2 is a cross-sectional view showing the entire configuration of one embodiment of the present
invention FIG. 3 is a cross-sectional view for explaining the manufacturing process of the main
part of one embodiment of the present invention
[0018]
4 is a diagram showing the frequency characteristics of one embodiment of the present invention
5 Description of a diagram symbol showing the frequency characteristics of the comparative
example
[0019]
11 voice coil 13 cone-shaped diaphragm 16 cap 20 magnetic circuit
11-05-2019
5
Документ
Категория
Без категории
Просмотров
0
Размер файла
12 Кб
Теги
jph04371098
1/--страниц
Пожаловаться на содержимое документа