close

Вход

Забыли?

вход по аккаунту

?

JPS5570198

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 JPS5570198
Specification 1, title of the invention 2,% claim 0) A method of manufacturing a speaker
diaphragm, characterized in that a metal coating is jetted and attached to the speaker diaphragm.
Method of manufacturing speaker diaphragm
3. Detailed Description of the Invention The present invention relates to a method of
manufacturing a loudspeaker diaphragm, and more particularly to a method of processing cone
paper to improve the high frequency characteristics and sound quality of the loudspeaker
diaphragm. A general cone speaker is shown in FIG. 1, and in order to obtain good frequency
characteristics in this type of speaker, the acoustic radiation surface 10 needs to have physical
properties such as high rigidity and large internal loss. Also, the edge portion 12 requires
physical properties such as small elasticity and a sufficiently large internal loss, and further
requires physical properties such as light mass and sufficiently large rigidity in the vicinity of the
cone paper top 14, and these physical properties are satisfied. The vibration force of the voice
coil can be transmitted to the radiation surface 10 without loss by the speaker diaphragm. In
general, the high frequency resonance frequency fh of the speaker diaphragm has a stiffness 8h
at the top of the cone and a frequency characteristic in which the response EndPage: 1 decreases
rapidly in a high frequency region higher than the frequency determined by the quality of the
voice coil. Here, the stiffness sh at the top of the cone is given by setting the apex angle of the
cone to 20, the thickness to tc (6 ′ ′) and the Young's modulus of the cone paper to m (− 譚).
Therefore, for cone paper of the same shape and diameter, if the stiffness sh at the top of the
cone paper is increased, the high frequency resonance frequency can be increased to improve
the high frequency characteristics. In the conventional speaker diaphragm manufacturing
method, in order to increase the stiffness of the top of the cone paper described above, a
10-05-2019
1
treatment method in which a clear lacquer is coated or impregnated on the top of the cone paper
is used. According to the conventional clear lacquer process, the Young's modulus at the top of
corn paper can be increased to improve the high frequency characteristics. FIG. 2 shows a
conventional example in which the clear lacquer is applied (from the top of the cone to the fourth
corrugation too), and as a result, the dynamic elastic modulus 1 'is the ratio 902 of the 90 * s
dynamic elastic modulus to the density. Was increased by about 60%, and the improvement as
shown by the characteristic (1) was obtained by the clear lacquer treatment as compared with
the characteristic (1). However, the conventional clear lacquering method has the disadvantage
that the characteristics vary depending on the composition of the clear lacquer, the permeability
of the lacquer, the amount of adhesion, the amount of treatment, the method of treatment and
the method of drying, etc. There was a drawback. The present invention has been made in view
of the above-described conventional problems, and an object thereof is to provide an improved
method of manufacturing a loudspeaker diaphragm capable of obtaining extremely stable highfrequency characteristics. In order to achieve the above object, the present invention is
characterized in that a metal coating is jetted and attached to a speaker diaphragm.
According to the present invention, it is possible to increase the stiffness of a desired portion of
the speaker diaphragm due to the adhesion of the metal film, and to significantly improve the
high frequency characteristics. In the present invention, the metal coating can be attached to any
part of the speaker diaphragm, and in particular, in a cone type speaker, it is preferable that the
metal coating be attached near the top of the cone paper. In the present invention, the metal
coating is formed on the speaker diaphragm by a molten metal low-temperature spraying method
in which a metal melted under vacuum is jetted into a high velocity air stream and the rapidly
cooled metal particles are jetted and attached. Is preferred. In the present invention, the cone
sheet of the speaker diaphragm is rotated about the cone axis, and the low temperature spray
gun is moved in the radial direction of the cone sheet to form a thicker metal film on the tip side
of the cone sheet than the peripheral side. It is preferred to increase the stiffness near the top of
the paper. In the present invention, it is also possible to use a partial adhesion method in which a
shielding plate is placed on the unnecessary part of the metal coating, and the metal coating is
formed only on the necessary part. Hereinafter, preferred embodiments of the present invention
will be described based on the drawings. FIG. 4 shows a preferred embodiment of the
manufacturing method according to the present invention, in which the metal coating is formed
in the vicinity of the top of the cone paper of the cone type speaker. The cone paper 20 is
continuously rotated about the cone axis 200 in the direction of arrow A, and from the low
temperature spray gun 22 disposed opposite to the cone paper 20, metal fine particles 24
obtained from the metal wire 23 are inward of the cone paper 20. It is injected toward the The
low temperature spray gun 22 is controlled to move at a constant speed in the radial direction
arrow B of the cone paper 20. The shielding plate 26 is held in close contact with the peripheral
edge of the cone paper 2-00 to prevent the formation of a metal film on the periphery I 1. The
low temperature thermal spray gun 22 injects a molten metal such as aluminum, titanium or
10-05-2019
2
beryllium into a high velocity gas stream under a vacuum, and as a result, the metal is rapidly
cooled to an amorphous metal particle of 2 to 2 microns. The fine particles fly at high speed due
to the high speed air flow and collide with the inner surface of the cone paper 20 which is a
sprayed object. The metal particles are intertwined with each other to form a strong chain-like
film bond at normal temperature, and a desired metal film is formed on the inner surface of the
corn paper 20. When the metal coating is applied to the EndPage: sheet paper, its stiffness is
increased, and it is possible to improve the high-pass characteristic as is apparent from the above
description. In the embodiment of FIG. 4, since the cone paper 2o rotates at a constant speed
about the cone axis 200, and the low temperature spray gun 22 is moved at a constant speed in
the radial direction of the cone paper 2o, Due to the change, the deposition amount of the metal
coating increases as approaching the top of the cone paper 20, and a very ideal state can be
obtained as the distribution of weight, density and Young's modulus of the diaphragm.
According to the present invention, the dynamic elastic modulus l 'and the ratio of the dynamic
elastic modulus to the density can be increased as compared with the conventional clear lacquer
processing, and the same processing range of the cone paper for all bands of 16a11 can be
increased. The clear lacquer geography and the properties of the metal coating according to the
invention are shown in FIG. The metal film treatment characteristic (lV) of the present invention
shows the case where about 0.6 grams of aluminum metal is adhered, and the flattening and high
sound of the high sound characteristic as compared with the conventional clear two-tucker
treatment characteristic (1) It is understood that significant improvements in growth have been
made. In the present invention, the characteristics and the sound quality can be remarkably
improved by appropriately changing the kind, the application range or the application amount of
the metal used, and the characteristics are the transfer speed of the low temperature spray gun,
the injection time or the metal wire By appropriately controlling the feed rate, the amount of the
metal particles adhered can be controlled with high precision, and a loudspeaker diaphragm of
stable quality can be obtained. As described above, according to the present invention, it is
possible to easily obtain a speaker diaphragm having extremely good high-frequency
characteristics.
4. Brief description of the drawings FIG. 1 is an explanatory view showing a schematic
configuration of a general cone type speaker, FIG. 2 is an explanatory view showing a method for
manufacturing a speaker diaphragm by the conventional clear lacquer processing, and FIG. Fig. 4
is a partially broken explanatory view showing the metal and film processing method according
to the present invention, and Fig. 5 is the application of the processing (8) method according to
the present invention in Fig. 4. FIG. 7 is a frequency characteristic diagram of the speaker
diaphragm thus obtained. In the figure, 20 is a cone paper, 22 杜 low temperature thermal spray
gun, 24 is metal fine particles, 26 is a shielding plate, and 20G is a cone axis. Agent Patent
Attorney Shino Kuwano-(Other 1 person) (9) 1st ml! l [2 Figure EndPage: 3
10-05-2019
3
10-05-2019
4
Документ
Категория
Без категории
Просмотров
0
Размер файла
12 Кб
Теги
jps5570198
1/--страниц
Пожаловаться на содержимое документа