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JPS54139718

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DESCRIPTION JPS54139718
Description 1, title of the invention
Reinforcement method of diaphragm in speaker
6. Detailed Description of the Invention The present invention relates to the improvement of a
speaker using a flat diaphragm, and more particularly to a novel reinforcing method of the
diaphragm. The diaphragm of a conventional cone-shaped speaker is generally formed in a shape
which is conical or jerky as illustrated in (10) of FIG. The diaphragm a.omega. Is moved back and
forth by the voice coil (11) that drives it, and the n1 surface of the diaphragm a.omega. Is excited
to become a sound wave and reaches the listening point. However, in such a conical diaphragm,
the sound waves generated from each point, for example, (X 1 · (Z · (Z)) have a distance
difference (X n) (Y n) (Zn) Because they have), sound waves generated from each reach the
listening point with a phase difference. Thus, due to the phase difference, the sound waves
generated from each cause interference with each other, and the waveform of the sound wave at
the listening point is different from the waveform of the original signal applied to the voice coil
(11) , That is, with phase distortion. Furthermore, since such phase distortion exhibits a change in
an extremely complicated manner with EndPage: 1 when the frequency of the original signal
changes, the sound quality is far from the D sound. A planar diaphragm as shown in FIG. 2 has
been proposed as a means for reducing such change in sound quality (deterioration). Therefore,
it is believed that it is possible to follow the above-mentioned cause based on the cause as
described above (to prevent the occurrence of distortion of the human phase). However, it is
natural that the diaphragm 0 has a specific mass determined by its material and its volume, etc.,
and it can not be constructed of a large rigid body, so all of the planes of the diaphragm It is
practically very difficult to vibrate at the same phase in the part and in the same cutting width in
practice. If it is, the mass of the diaphragm will be extremely small, yet it will have a high rigidity
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In the case of a speaker aiming to play music, resonance must be prevented as much as possible
in the audio frequency band, and the minimum three conditions of not having to be as small as
possible. This is because it is necessary to simultaneously satisfy −139718 (2) f condition, but
the description will be omitted). Furthermore, to illustrate each of the conditions described above
and the reasons, a) in order to improve the transient characteristics, and to sufficiently reproduce
the high range of the audio frequency band, b) the divided vibration of the diaphragm In order to
prevent it and to withstand the large amplitude of the hole, its rigidity should be as high as
possible. C) In order to equalize the frequency characteristics, disperse the resonant frequency of
the diaphragm (system);
The resonance sharpness should be as low as possible. In other words, the internal loss of the
diaphragm material must be thickened. Although typical conditions have been described above,
each has mutually contradictory properties, so in general, for example, divided into lowfrequency reproduction and high-frequency reproduction according to the usage and type of the
speaker, The first weak point of each of the above conditions is determined, and the material of
the diaphragm is set. Therefore, in the case of a speaker aiming at reproduction of the whole
frequency band, it is the present condition that the characteristic is far from ideal. The present
invention relates to a method of reinforcing a diaphragm to obtain a speaker with excellent
sound quality, in particular, in a flat diaphragm speaker, by using the above-mentioned 堵
conditions and losing each characteristic. The present invention will be described in more detail
by the following examples. FIG. 3 is a perspective view of the diaphragm according to the
embodiment of the present invention as viewed from the back side (the edge of the diaphragm
edge and the damper attached to the periphery of the voice coil are not shown); The circular
plate of the diaphragm is shown, and the material is appropriately selected if it is acoustically
excellent as this type of diaphragm, such as paper or cloth appropriately coated with a shape
retention agent, or foam metal. It may be a thin plate, or a laminate of a plurality of different
materials, etc., but the inventor uses a foamable synthetic resin, for example, a relatively high
density thin plate of expanded polystyrene. (2) indicates a voice coil. (3) is a reinforcing member,
in which a natural bamboo material is cut into a size and a shape to be described later, and after
it is fitted into S * provided on the back side of the diaphragm (1), an adhesive is used. It is fixed
and the base of the voice coil (2) is strongly adhered. FIG. 4 is a side view of FIG. 3 and FIG. 5 is a
view from 1-plane, showing an alternate combination portion of 51 (two reinforcing members
43) and (3). FIG. 6 is a partially enlarged cross-sectional view, and (4) is a fitting groove of the
reinforcing member (31). In the embodiment, the depth of the groove (4) is slightly deeper than
that near the center (3b) as the 1M side of the diaphragm +1+ is reached. FIG. 7 is a sectional end
view taken along the line A-A in FIG. 6, and shows a state in which the reinforcing member (3) is
inserted into the recessed groove (4). As an example of specific dimensions of each part in the
embodiment, the diameter of the diaphragm (1) is about 10 countries and the thickness is about
2.5 聰. Reinforcement member (3) has a thickness of 0.5 opening degree, and its length is about
4 m at EndPage: 2 (3b), which is approximately equal to the diameter of diaphragm (1), 2 near
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both ends (3a) It has a shape with gradients in both directions, and as shown in Fig. 6, one of
them is near the central part (3b) close to the drive source as a whole compared with its both
ends (3a). It has a bent shape.
In addition, the cross-sectional shape of the reinforcing member may be a wedge shape (three or
triangular or acute triangle shape, for example, as illustrated in the eighth sectional view), for
example, without being taken in such a shape at the time of implementation. In yet another
embodiment, even if the reinforcing member is of the same height throughout, its thickness is
thinner at both ends (3a), gradually becoming thicker toward the center and becoming closer to
the center ( It may be made thicker by 3b). The point is that the motion transmitted from the
voice coil (2), which is the driving source, causes extreme resonance or distortion (any shape as
long as the shape can be transmitted to the entire reinforcing member C) May be Also, the
reinforcing member may be, for example, as shown in FIG. 9 (in the shape of three (three (32),
each alternate combination disclosed in JP-A 54-139 8 (3) portion (52) voice coil (2) may be
attached, and furthermore, a large number of reinforcing members may be arranged radially
from the center of the diaphragm (1). In any case, bamboo fibers in the longitudinal direction of
the reinforcing members Align the direction of Incidentally, when the reinforcing member is
adhered to the diaphragm, a means may be suitably adopted according to the type of diaphragm
to be used without being limited to fitting into the above-mentioned recessed groove, for
example, as shown in FIG. (The adhesive may be directly attached to the bottom of the diaphragm
(1), or a liquid agent having a reinforcing effect may be injected into the inside of the diaphragm
in the vicinity of the adhesive portion. It may also be of other shapes. The reason for using
polystyrene foam for the diaphragm (1) as a practical example of the present invention is as
follows. The material is .1 in spite of the fact that the hardness is high and the internal loss The
main reason is that it is easy to select Also, the reason why natural bamboo is used for the
reinforcing member (3) is that it mainly disperses resonance, has a damping function, and is
excellent in moisture resistance etc. is there. Since the embodiment of the present invention is
configured as described above, the motion of the voice coil (2) is faithfully transmitted to a wide
range of the diaphragm (1) mainly through the tough reinforcing member (3). Therefore, it is a
diaphragm made of a relatively flexible material (though it is possible that the entire surface is
flexed (that is, it is vibrated with the same phase, the amount of amplitude, and thus unnecessary
vibration such as split vibration and resonance / anti-resonance) Can be neglected. For this
reason, the diaphragm itself can be made of a lightweight material without being restricted by
rigidity or the like, and as a result, a very excellent transient characteristic can be obtained, and
at the same time the high frequency band of the audio frequency band is sufficient. It becomes
possible to reproduce.
Furthermore, since an appropriate material of the internal loss can be freely selected, the
resonance frequency of the diaphragm can be dispersed, and since it vibrates there, no phase
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distortion occurs between the sound wave generation points. As a result of the above synthesis,
the speaker according to the present invention has an acoustic characteristic that is extremely
faithful to the original signal, especially for music reproduction, and there are human effects. In
the practice of the present invention, it goes without saying that various modifications and
additions can be made within the scope of the present invention without departing from the
scope of the present invention, and all of them are included in the scope of the present invention.
.
4. Brief description of the drawings FIGS. 1 and 2 show a prior art example. 3 to 11 show an
embodiment of the present invention, and FIG. 3 is a perspective view when a circular diaphragm
is used, FIG. 4 is a side view, and FIG. 5 is a top view, 6 and 7 are partial sectional views. 8 and
EndPage: 3 and 11 are top views of other embodiments. In the figure, (1). (1 is a diaphragm, (2)
is a voice coil, (3), (3. (3)) is a reinforcing member, and (4) is a recessed groove. Patent applicants
Takaki Ogi Special 1 Sho 54-139718 (4) EndPage: 4 Special 1 Sho 54-139718 ', 5)) Ear Figure
EndPage: 5
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