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JPS56128790

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DESCRIPTION JPS56128790
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 1b are side sectional views showing a
conventional speaker diaphragm, FIG. 2 is a side sectional view showing a loudspeaker
diaphragm according to an embodiment of the present invention, and FIG. It is a side sectional
view for explaining the important section of the manufacturing process of the speaker diaphragm
in one example of the invention. In the figure, reference numeral 1 denotes a diaphragm portion,
2 denotes a hovin portion, and 3 denotes a hard film. In the drawings, the same reference
numerals indicate the same or corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a loudspeaker imaging plate in which a fine movement plate portion and a bobbin portion for
voice coil are integrally formed. Heretofore, there has been one shown in FIG. 1 as a speaker
imaging plate of this type. In the figure, (1) is a transmission plate portion, FIG. 1 (,) shows a cone
shape, and FIG. 1 (b) shows a typical shape of a dome shape. The numeral +21 is a bobbin for a
voice coil connected to a pile of a fishing rod. These loudspeaker imaging plates are usually made
of paper obtained by forming a fiber material such as balun ", a molecular film, @ metal foil or
the like. On the other hand, since the bobbin of the voice coil is a history of being inserted into a
closely-finished magnetic pole gap so that the magnetic energy can be utilized at the maximum
efficiency, it is necessary to similarly finish the dimension of ^ precision There is. If the material
is paper, the bobbin is formed vertically, and it is difficult to finish to a size of ^ (2) accuracy in
one normal papermaking material. When a polymer film or the like is used as the material, there
is a problem that the bobbin is thermally deformed due to heat generation when large electric
energy is supplied to the voice coil. In addition, there is a limitation that it is necessary to use
relatively soft materials such as aluminum, titanium and magnesium which can be formed into
such shapes in order to use light metal as a material, and the forming process to a speaker shape
and voice coil It is easy to be deformed in the middle step of the winding work of the machine,
etc., and since the surface direction is smooth, the bonding strength between the coil and the
11-05-2019
1
bobbin by the face is small when the voice coil is winding, determined by the thermal * i of the
voice coil This device was designed to eliminate the above-mentioned drawbacks of the prior art,
and it was formed integrally with a fi motion plate and a voice coil bobbin. In the gold 46 speaker
narrator plate, the portion around the voice coil on the outer side of the bobbin i 121 is
hardened, according to (3). It is less, and its object is to provide a loudspeaker 畿動 plate having
large bobbin portion of the bonding strength between the voice coil and the bobbin portion wax
2) (2). Hereinafter, an embodiment of the present invention will be described with reference to
the drawings. In FIG. 2, (1) is a dome-shaped imaging plate portion, (2) is a cylindrical bobbin
portion, and these retaining plate portions (11 and the bobbin portion (2) are integrally made of,
for example, aluminum foil). It is molded. Reference numeral +31 denotes a hard coating formed
on both sides of the imaging plate portion (1) and only on the outer surface of the bobbin portion
(2).
As a method of forming the hard coating (3), a method of directly depositing a hard substance
from the gaseous state into a thin film according to JP-B-53-45134 or the like, or JP-A-5177220, JP-A-51-140619, etc. There is a method of diffusing atoms such as boron from the front
face of the metal foil presented in the above to form a hard boronide layer. In general, the front
opening is finished smooth so that there is little w-friction at the time of base gold @ foil molding
processing, while the front opening of the layer formed as a hard coating is a seed (4) seed At
least microscopically, the surface is considerably rough. Since the hard coating (3) has a high
Young's modulus, the hard coating (3) is formed on both surfaces of the metal foil for the
purpose of making the # Young's modulus as high as possible It is desirable to use a sandwich
structure, but as the hard film (31 has a small elongation and a considerable elongation, the
bobbin part (2) which is considerably deformed at the time of ridgeline as in 9 sides only, as in
the sandwich structure) It is essential to avoid large deformation of ’カ4ル。 Even if Nao, W'a
'mosquito 1 prisoner is formed, the source side 31 + 91 "' p <yHs, + 'l bei forest-deformation · #
well · 4 q 岬 5 scraping of the bobbin part (2)耽 Mi h 紺 also. As shown in FIG. 3, the speaker
gear and moving plate as shown in the above embodiment has an inner diameter jig 14 which
waits for both the securing of nine dimensional accuracy and the masking action on the hard film
(3) inside the bobbin portion +21. It can manufacture easily by performing the formation method
of a well-known hard film (3) in the state which applied B). (5) As described above, according to
the present invention, the performance required for each portion is satisfied in the speaker
movable plate in which the moving plate portion 11) and the bobbin portion (2) are integrally
formed. In the imaging plate portion, the apparent Young's modulus can be obtained, and in the
bobbin portion, the deformation is small and the bonding strength to the bobbin portion (2) by
the face of the voice coil can be obtained. Because of this there is no vibration in 9 divisions, ^
excellent in mounting. And there is an effect that a speaker mobile board with improved input
resistance can be obtained.
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