JPS59154900

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DESCRIPTION JPS59154900
[0001]
TECHNICAL FIELD OF THE INVENTION The present invention relates to a cone-type speaker
provided with a composite diaphragm including a cone-shaped main eye moving plate and a
wave-shaped reinforced diaphragm. [Technical background of the invention and its problems] In
order to achieve the above, it is necessary to reduce one-sided density change. Furthermore, in
the cone type speaker, the high frequency f has a resonance taste, and the sound pressure is
sharply attenuated at frequencies higher than the resonance frequency. This resonant frequency
is called the upper limit layer wave number (fh) and can be expressed by the following equation.
8 h = π · W−h Cos′θ: Stiffness E of bending of a cone-shaped diaphragm E: Young's modulus
of a cone-shaped diaphragm h: 14 つ け of a cone of a diaphragm mo: mass of cone-shaped
diaphragm mv: mass of voice coil In the conventional cone-type speaker, the distance between
the Young's ridges of the diaphragm is not so large. The angle (θ) had to be reduced. However,
when the half apex angle Cθ becomes smaller, the front room effect becomes larger, and the
sound quality is deteriorated. OBJECTS OF THE INVENTION The present invention is intended to
eliminate the above-mentioned drawbacks and to increase the half apex angle of the diaphragm
to suppress the anterior chamber effect while boiling the high-pass force. [Summary of the
invention] The cone type speaker of this invention dJ1 has a truss structure comprising a mainflowing plate of a cone blowing and a reinforcing diaphragm bonded to a back surface thereof
with a plurality of zigzag contact parts and a plurality of zigzag connection parts. The department
is said main four. Because of the cone shape of the peristaltic plate, the rigidity can be enhanced
without increasing the density too much. Therefore, it is possible to widen the piston oscillation
region of the speaker and to improve the sound Iσ. In addition, it is possible to reduce the
depressions of the temples and cones by increasing the half apex angle. It is possible to lower the
juveniles in the front room and to measure the sound quality from this aspect as well.
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will
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be described below with reference to the drawings. FIG. 1 is a developed plan view showing an
example of a pattern of folds in the case where the reinforcing image-pickup plate 1 is formed by
bending a single flat plate 2. In the figure, 3 shown by a broken line is a mountain fold line, 4
shown by a dot-and-dash line is a valley fold line, and four parallelograms 5A as shown by 1 by
adjacent mountain fold lines 3 and valley fold lines 4. 5B, 5C, 5D are formed. Therefore, if the
portion occupied by the four parallelograms 5A, 5B, 5C, 5D is considered as the unit area 5, the
pattern of FIG. 1 is such that such unit areas 5 are made continuous in the radial direction and
circumferential direction. It can be said.
For example, a relatively hard paper is used as the flat plate 2. FIG. 2 is a side view showing the
main diaphragm 6, and a bobbin 7 is joined and provided at the base end of the main diaphragm
6, and a voice coil 8 is wound around the bobbin 7. When the flat plate 2 is bent and threedimensionalized based on the pattern of FIG. 1, the jig sag-like adhesive portion 9 as shown in
FIG. 3 and FIG. A reinforced imaging plate 1 can be obtained. In this case, the plurality of zigzag
bonded portions 9 are arranged concentrically. The parallelograms 5A and 5B have inclinations
respectively rising from the (outside end of the reinforced diaphragm 1) of the outermost
bonding portion to the mountain fold line 4 and the parallelograms 5C and 5D are inclined to
this mountain fold line It inclines to descend ¦ fall with respect to the adhesion part 9 of
following order from 4 respectively. 3 and f44 are a side view and a rear view showing a state in
which such a reinforced diaphragm 1 is bonded to the back surface of the main diaphragm 6 of
FIG. 5 shows a front view of the same state. What is shown by a broken line in FIG. 5 is a bonding
portion 9 of the main imaging moving plate 6 and the reinforcing diaphragm 1, and these
adhesion portions 9 are arranged concentrically around the cone-shaped apex of the main
imaging moving plate 6 It is clearer what is being done. FIG. 6 is a simplified cross-sectional view
of FIG. 4 taken along the line VI-VI and viewed in the direction of the arrow, whereby the
reinforcing diaphragm 1 has a triangular shape with the bonding portion 9 at the bottom, thus
making a complex vibration. It is shown that the board 10 has a truss structure as a whole. In
this cone-type speaker, the composite diaphragm 10 is formed of a truss structure by a coneshaped main slide plate 6 and a reinforced diaphragm 1 having a triangular cross-section, and
the truss (main) slide plate 6 and auxiliary vibration Since the bonding portions 9) with the plate
1 are arranged in a zigzag shape, the strength against bending can be enhanced without
appreciably increasing the relatively simplified configuration flaw density. Therefore, it is
possible to widen the piston vibration area of the speaker and improve the sound quality. FIG. 7
shows the frequency characteristic curve I of the loudspeaker according to this embodiment in
contrast to the frequency characteristic curve {circle over (2)} of the follower of this embodiment.
Since this speaker exerts a truss structure also on the joint portion between the main diaphragm
6 and the bobbin 7 to further enhance the rigidity, the stiffness Sh of the attachment of the coneshaped diaphragm in the above-mentioned formula (1) It is possible to increase the value of
Therefore, the high frequency band limit frequency fh can be increased compared to the
conventional speaker.
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Furthermore, by increasing the stiffness Sh, it is possible to increase the half apex angle of the
main imaging moving plate 6 in the form of a cone to make the depression of the cone-shaped
portion smaller, and there is an advantage that the front chamber effect can be reduced. Next,
FIGS. 8 to 10 show other embodiments of the present invention, respectively. First, the
embodiment of FIG. 8 is characterized in that the truss structure of the composite diaphragm 10
'consisting of the main diaphragm 6 and the reinforced imaging plate 1 becomes thinner toward
the outer periphery at the center. In this case, since the bending rigidity can be increased toward
the central portion, the half apex angle can be increased and the overall weight can be reduced.
Therefore, by such weight reduction, the efficiency as the Besby force can be increased and the
sound pressure can be increased for the same human power as in the embodiment of FIG. The
embodiment in FIG. 9 not only makes the truss structure of the composite imaging plate 10
thinner as the center goes to the outer periphery, but also roughens the truss structure as the
center goes to the outer periphery The core part is further enhanced in bending rigidity to
emphasize its effect. In the embodiment shown in FIG. 10, the reinforcement diaphragm 1 is
further reinforced on the center side except for the outer peripheral portion in such a
configuration, to further emphasize the effect of weight reduction by eliminating the truss
structure on the outer peripheral portion. It is The various configurations shown in FIGS. 6 and 8
to 10 can be appropriately selected as necessary. The reinforcement of the bending rigidity in the
present invention can also be achieved by the embodiment shown in FIG. In this embodiment, the
strength against bending is enhanced and the sound quality is improved by increasing the width
of the zigzag of the zigzag bonding portion 9 between the main diaphragm 6 and the reinforcing
diaphragm 1 indicated by a broken line. The present invention is not limited to the above
embodiments, and various modifications can be made without departing from the scope of the
invention. For example, although the above embodiment shows the case where one sheet of
paper is bent and formed as the reinforced imaging plate 1, it may be replaced by another
material such as metal foil, or polyvinyl chloride It can also be manufactured by molding using a
synthetic resin such as, for example. The reinforcing diaphragm 1 has been described as having a
uniform thickness, but it is also possible to use, for example, a diaphragm 1 whose central
portion becomes thinner toward the peripheral portion. Further, although the reinforcing
diaphragm 1 has a triangular cross section in the radial direction, it is possible to use another
corrugated one in which this shape is slightly deformed.
[0002]
Brief description of the drawings
[0003]
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FIGS. 1 to 6 show an embodiment of the present invention, and FIG. 1 is a developed plan view
showing a pattern of fold lines when a reinforced diaphragm is formed by bending a single flat
plate, FIG. The figure is a side view showing the main diaphragm and the bobbin joined thereto,
and FIGS. 3 and 4 are side views showing a composite diaphragm formed by bonding a
reinforcing plate to the back of the main diaphragm. Fig. 5 is a rear view, Fig. 5 is a front view,
and Fig. 6 is a simplified cross-sectional view of Fig. 4 taken along the line VI and viewed in the
direction of the arrow.
FIG. 7 is a frequency characteristic diagram of the embodiment, FIG. 8 to FIG. 10 are simplified
sectional views of other embodiments of the invention, and FIG. 11 is a front view showing still
another embodiment of the invention. . DESCRIPTION OF SYMBOLS 1 ... Reinforcement
diaphragm 2 ... Flat plate 3 ... Mountain crease line 4 ... Valley crease line 5 ... Unit area 6 ... Main
diaphragm 7 ... Bobbin 8 ... Voice coil ° 9 · · · Bonding section 10 · · · Composite diaphragm
Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 Figure 10 Figure 7; -To 11 t '-, c
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