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JPS5592095

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DESCRIPTION JPS5592095
Description 13 Title of Invention
Speaker device
3. Detailed Description of the Invention The present invention relates to a speaker device, and
more particularly to a change of sound quality in the speaker device. The inventor of the present
invention previously invented and filed a patent application for a speaker diaphragm (hereinafter
referred to as a high rigidity diaphragm) for a speaker having an extremely high rigidity made of
fiber reinforced plastic, metal, etc. Those disclosed in Japanese Patent Application Laid-Open Nos.
58-57022 and 53-119023 are disclosed. In this way, if a diaphragm with high rigidity is used, a
very clear and beautiful sound can be obtained as compared with a diaphragm made of a
relatively soft material such as paper, and it can be made about three times as much. However,
subsequent studies have shown that there is room for further improvement in sound quality.
That is, the front edge of the edge for movably connecting the outer peripheral edge portion of
the diaphragm to the speaker frame (hereinafter simply referred to as a frame), the edge and the
diaphragm without contacting the diaphragm and from the front side of the speaker device It is
clear that the sound quality is further improved if the shield is fixed so as to cover at least almost
the entire surface of the edge. This is considered to be due to the following reasons. That is, since
the diaphragm itself is extremely rigid as described above, it vibrates faithfully to the signal given
to the voice coil and EndPage: 1, but this is an edge for connecting the diaphragm to the speaker
frame Is forced to have flexibility by its nature, so that this edge does not necessarily vibrate in
accordance with the @ sign given to the voice coil, so this is a cause of noise generation and also
a high rigidity diaphragm . It is also relatively soft and thin, as a sound insulation board for
preventing sound waves from the reverse phase generated from its back surface from being
reflected on the inner surface of the speaker cabinet from passing through to the front ml It is
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thought that the edge which has to be forced is not always very good as a sound insulation
board, and for this reason, the reflected sound leaks forward through the edge, which also
contributes to the deterioration of the sound quality. In addition, the sound emitted from the
diaphragm IJ quotient is reflected by the wall of the room, etc., and this arrives near the edge, is
emitted from the edge, is reflected by the inner surface of the cabinet, passes through the edge,
The noise that leaks into the room, all noise reflected from the wall of the room, etc. is blocked by
the blocking fixed in front of the edge, and the speaker device held by the present invention
makes the sound beautiful than before. It is considered to be the cause that can be obtained.
Although it is only necessary to wait for future research to determine whether or not this
speculation is appropriate, it has been confirmed by almost all of the listeners who have attended
the experiment that the sound quality is actually improved.
In addition, it has been confirmed by experiments that even if a similar shield is attached to a
speaker using a conventional paper diaphragm, the sound quality is hardly improved by an
experiment, and this fact proves the validity of the above estimation. It is considered to be one.
Several embodiments of the present invention will now be described in detail with reference to
the drawings. In FIG. 1, reference numeral 1 denotes a wooden closed box which is a kind of
baffle, and the speaker 3 is fixed in a state of looming the opening 2 formed in the n ′ ′ l ′
circumference of the closed box l. A shield 4 is fixed on the front, and a speaker device 1-00 is
configured by these. Reference numeral 19 is a sound absorbing material. The speaker 3 is
provided with a diaphragm 7 comprising a cone 5 and a dome 6 as shown in FIG. 2 in an
enlarged manner, and one end of a bobbin 9 of the voice coil 8 is fixed to the diaphragm 7. There
is. The 7 ° cone 5 has a substantially truncated circle shape and is provided with a large number
of radial ribs lO on its inner surface (or a single outer character may be corrected) and reinforced
by glass, glass fiber, etc. It is injection molded of resin (FRTP). It is desirable that the thickness t
of the cone portion 5 be gradually decreased from the central portion toward the outer
peripheral portion, and particularly in the present embodiment, the product r-t with the wall
thickness gradually decreases toward the outer peripheral portion. The average meat enjoyment
Q, 5 mm. The outer peripheral portion has a minimum thickness Q of 3 mm. In addition, the
dome portion 6 of the diaphragm 7 is a dome-shaped disc body formed to be convex toward the
front, and the thickness thereof is made thinner toward the central portion,-9 on the back side of
FIG. As shown by the brightest lines, a number of radial O-blocks 11.12 are formed. The ribs 11
are generally height <height, and are as high as the center, and are mutually connected at 5center. On the other hand, the rib 12 is a low rib and is disposed two by two between the ribs 11.
The dome wall 6 is also injection molded of a fiber reinforced thermoplastic resin as the cone
portion 5 is. The bobbin 9 is a resin-impregnated paper cylinder, the voice coil 8 is wound at one
end thereof, and the unwound portion of the voice coil 8 is an aluminum thin plate 13 of about 0,
15 mm epoxy Bonded and reinforced with resin. The cone part 5, the dome part 6 and the
bobbin 9 which are structured as described above are adhered to each other by epoxy-lipid tweight so that they are light weight (about 20 g) and hardly flex even when strongly pressed
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with a finger It constitutes a structure with high rigidity. Are attached to the frame 22 by
That is, the edge 21 is a fabric ring with a circumferential corrugation to increase its
deformability, the inner periphery of which is affixed to the outer periphery of the vibration J7
while the outer periphery is The section is placed on the front of 7 runes of the frame 22 and 6EndPage: 2 ", and the diaphragm 7 is lightly moved in the axial direction. A shield plate 4 is
fixedly provided in front of the airframe 21. The shielding plate 4 is an annular member formed
of a synthetic resin, and a plurality of sub-surfaces arranged at equal pitches (but with the entire
surface in this case, 7 And the outer peripheral portion is projected outward from the frame 22.
The shielding plate 4 is also shaped so as to approach the edge 21 toward the inner peripheral
portion, and at the inner peripheral end, it is made to approach to such an extent that a gap
remains slightly even when the diaphragm 7 vibrates at the maximum amplitude. It is done. A
sound absorbing material 24 such as foam rubber is adhered to the back surface of the shielding
plate 4. The voice coil 8 described above is inserted in the magnetic field formed by the quotient
of the inner peripheral surface of the tip of the yoke 25 and the outer peripheral surface of the
pole 27. When a signal current is supplied to the voice coil 8 in the speaker device 1oo
configured as described above, the diaphragm 7 which has high rigidity and is light in weight
vibrates according to the signal current to generate a more beautiful sound. However, the soft
edge 21 does not necessarily have the signal current 2F, ', s, A! It does not vibrate faithfully, and
depending on the frequency it produces quite a lingering sound. However, in the present
embodiment, since the shielding plate 4 is disposed in front of the edge 21, it is shielded and
does not reach the listener's ear. And it is really glued! ・ Because of this, most of the intercepted
sound is absorbed by it, and the remaining part is made to approach the flange 21 between the
baffle plate 4 and the frame 22 and most of the sound that can not be made gap with the edge
21 is out. The shielding plate 4 is also shielded from the back surface of the diaphragm 7
(especially, the capital city 5) because the sound emitted from the edge 21 is prevented from
interfering with the sound emitted from the diaphragm 7 by a small amount. Even if the sound
emitted and contained in the closed box 1 leaks forward through the soft and thin edge 21 as in
the case of the sound emitted from the edge 21 itself, it is interrupted. It is considered that the
sound quality of the speaker device 100 of the embodiment can be improved by preventing the
sound from reaching the listener's ear and further from the diaphragm 7. In addition, although
the closed box 1 was used as a baffle in the present embodiment, the phase-reversal-type cabinet
as shown in FIG. It is possible to use all types of baffles, such as baleful, wall baffles using room
walls.
9-Also as shown in Figs. 5 and 6 as a shielding plate, a large number of sound absorbing
members 33 are disposed on the back surface of the ring-shaped flat plate 32, and between the
respective sound absorbing members 33 facing outward. It is also possible to use one having a
sound emission passage 34 of increasing cross-sectional area. Furthermore, attaching sound
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absorbing material to the back of the shielding plate and providing a sound emission passage
with an increasing cross-sectional area toward the outside are effective zero means respectively,
but only by the simple shielding plate without these. Can also get considerable effects. Further,
the material of the shielding plate is not limited to synthetic resin, and any material having the
ability to shield sound such as metal or wood can be adopted. The very rigid means of securing
the shield in front of the edge to attach the speaker frame to the speaker frame, the characteristic
of the high-rigidity diaphragm, which can generate a very clear and beautiful sound originally, is
harmed by the presence of the edge It is possible to prevent the noise and to improve the sound
quality of the speaker device using the high rigidity diaphragm further. lO−EndPage:
3
4. Brief description of the drawings. FIG. 1 shows a side view of the speaker apparatus according
to an embodiment of the present invention. FIG. 2 is a side sectional view showing an enlarged
view of the periphery of the speaker, FIG. 2 is a cross-sectional view of FIG. FIG. 4 is a side
sectional view of a speaker apparatus according to another embodiment of the present invention.
FIG. 5 is a back view of a shield used in still another embodiment of the present invention, and
FIG. 6 is a side view thereof. 1: Sealed box 3. Loudspeaker 4.32: a plate 7: diaphragm 21: energy
24. 33: sound absorbing material 34: sound emission passage-11-'Figure 5 EndPage: 4
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