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DESCRIPTION JP2006101203

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DESCRIPTION JP2006101203
PROBLEM TO BE SOLVED: To provide a speaker capable of minimizing the mutual interference
between vibrations by a small diameter voice coil and vibrations by a large diameter voice coil.
SOLUTION: A diaphragm having a ring-shaped main vibration portion 11, an inner support
portion 12 supporting a radial inner side of the main vibration portion 11, and an outer support
portion 14 supporting a radial outer side of the main vibration portion 11. 10, a speaker having a
large diameter voice coil unit 55 mounted on the outer edge of the main vibrating portion 11 in
the diaphragm 10 and a small diameter voice coil unit 50 mounted on the inner edge of the main
vibrating portion 11, The stiffness of the support portion 12 is higher than the stiffness of the
outer support portion 14. [Selected figure] Figure 2
スピーカ
[0001]
The present invention relates to a speaker used in an audio device, and more particularly to a
speaker provided with two concentrically arranged voice coils of different diameters.
[0002]
Conventionally, a so-called double voice coil speaker provided with two voice coils has been
proposed (see, for example, Patent Document 1).
In this type of speaker, a small diameter voice coil and a large diameter voice coil are
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concentrically mounted on a diaphragm formed of paper, cloth or the like. Then, the diaphragm
is vibrated by both the small-diameter voice coil and the large-diameter voice coil to which the
audio signal is supplied, and a sound corresponding to the audio signal is generated. According
to such a speaker, it is possible to produce sounds in a wide frequency band by the small
diameter voice coil respectively receiving the sound in the relatively high frequency band and the
large diameter voice coil respectively the sound in the relatively low frequency band. It becomes.
Japanese Utility Model Publication No. 53-163120
[0003]
However, in the speaker having the structure as described above, since the vibration due to the
small diameter voice coil and the vibration due to the large diameter voice coil are given to the
common diaphragm, the respective vibrations interfere with each other, so that The sound in the
frequency band may be distorted, or resonance may occur in a certain frequency band, and a
sound pressure level may be projected in a certain frequency band, for example, as indicated by a
broken line in FIG. 4. .
[0004]
The present invention has been made to solve such conventional problems, and provides a
speaker capable of minimizing the mutual interference between vibrations by a small diameter
voice coil and vibrations by a large diameter voice coil. is there.
[0005]
A speaker according to the present invention includes a ring-shaped main vibration portion, an
inner support portion supporting a radial inner side of the main vibration portion, and a
diaphragm having an outer support portion supporting a radial outer side of the main vibration
portion. A speaker comprising: a large diameter voice coil unit mounted on an outer edge of the
main vibrating portion in the diaphragm; and a small diameter voice coil unit mounted on an
inner edge of the main vibrating portion, the inner support portion The stiffness of the outer
support portion is higher than the stiffness of the outer support portion.
[0006]
With such a configuration, the stiffness of the radially inner support portion of the main
vibration portion is higher than the stiffness of the radially outer support portion of the main
vibration portion, and the stiffness of the inner support portion is the rigidity of the outer
support portion. taller than.
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For this reason, the vibration by the small diameter voice coil unit close to the high rigidity inner
support portion can be made smaller than the vibration by the large diameter voice coil unit, and
the influence of the vibration by the small diameter voice coil unit on the vibration by the large
diameter voice coil unit It can be made smaller.
In addition, since the rigidity of the inner support near the small diameter voice coil unit is
relatively high, the vibration caused by the small diameter voice coil unit can be made less
susceptible to the vibration caused by the large diameter voice coil unit.
[0007]
By changing the shapes of the inner support and the outer support, their stiffness can be
changed, and their stiffness can be changed by changing their materials.
[0008]
In the former case, in the speaker according to the present invention, the cross sections of the
inner support portion and the outer support portion have a curved shape, and the curved
diameter of the inner support portion is smaller than the curved diameter of the outer support
portion. The stiffness of the inner support portion may be higher than the stiffness of the outer
support portion.
[0009]
With such a configuration, the stiffness of the inner support portion is higher than the stiffness
of the outer support portion even if the main vibration portion, the inner support portion, and the
outer support portion are integrally formed of the same material. can do.
[0010]
According to the speaker of the present invention, the influence of the vibration by the small
diameter voice coil unit on the vibration by the large diameter voice coil unit can be reduced, and
the vibration by the small diameter voice coil unit is influenced by the vibration by the large
diameter voice coil unit. Since it can be made hard to receive, mutual interference with the
vibration by the small diameter voice coil unit and the vibration by the large diameter voice coil
unit can be minimized.
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As a result, distortion or the like of the frequency characteristic of the sound to be output can be
reduced as much as possible.
[0011]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0012]
A speaker according to an embodiment of the present invention is configured as shown in FIG. 1
and FIG.
FIG. 1 is a plan view of the speaker, and FIG. 2 is a cross-sectional view taken along the line A-A
in FIG.
[0013]
In FIG. 1 and FIG. 2, this speaker has a yoke 20 and a diaphragm 10 integrated with the yoke 20.
The diaphragm 10 made of synthetic resin, paper, cloth or the like comprises a ring-shaped main
vibrating portion 11, a ring-shaped inner support portion 12 for supporting the radially inner
side of the main vibrating portion 11, and the main vibrating portion 11. A flat portion 13 is
formed on the inner side of the ring-shaped inner support 12, and a ring-shaped outer support
14 that supports the radially outer side.
Each cross section (refer FIG. 2) of the main vibration part 11, the inner side support part 12, and
the outer side support part 14 becomes a curved shape which protrudes on the front side of the
said speaker.
[0014]
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The radius of curvature of each of the main vibration portion 11, the inner support portion 12
and the outer support portion 14 is set so as to obtain a desired sound output characteristic, and
in the present embodiment, in particular, the main vibration portion 11 and the inner support
The stiffness of the inner support 12 is set by forming the portion 12 and the outer support 14
integrally with the same material, and setting the radius of curvature of the inner support 12
smaller than the radius of curvature of the outer support 14. It is greater than stiffness.
Further, the radius of curvature of the main vibrating portion 11 is set to be several times larger
than that of the inner supporting portion 12 and the outer supporting portion 14, and most of
the sound that can be generated by this speaker is output from the main vibrating portion 11.
[0015]
An inner spacer 61 formed of a synthetic resin or the like is adhered and fixed to the back
surface of the flat portion 13 located at the center of the diaphragm 10. A convex portion 61 a is
formed on the surface of the inner spacer 61 opposite to the bonding surface to the diaphragm
10 (flat portion 13). A ring-shaped outer spacer 62 formed of a synthetic resin or the like is
bonded and fixed to the back surface of the outermost peripheral edge portion continuing further
outside of the outer support portion 14 in the diaphragm 10. Further, the large diameter voice
coil unit 55 is attached to the back side outer edge of the main vibrating portion 11 in the
diaphragm 10, and the small diameter voice coil unit 50 is attached to the back side inner edge
of the main vibrating portion 11. The small diameter voice coil unit 50 has a structure in which
the small diameter voice coil 51 is wound at a predetermined position of the small diameter
bobbin 52 having a diameter substantially equal to the diameter of the inner edge of the main
vibrating portion 11, and one end of the small diameter bobbin 52 is mainly used. It is adhesively
fixed to the back side inner edge of the vibrating portion 11. Further, the large diameter voice
coil unit 55 has a structure in which the large diameter voice coil 56 is wound at a
predetermined position of the large diameter bobbin 57 having a diameter substantially equal to
the diameter of the outer edge of the main vibrating portion 11, One end portion 57 is adhesively
fixed to the back outer edge of the main vibrating portion 11.
[0016]
The yoke 20 made of a magnetic material has a disc-like bottom 21, a ring-shaped outer
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peripheral wall 22 standing on the outer edge of the bottom 21, and a central cylindrical portion
23 standing on the center of the bottom 21. The ring-shaped groove 24 is formed between the
central cylindrical portion 23 and the outer peripheral wall portion 22. A recess 23 a is formed
on the end face of the central cylindrical portion 23. A ring-shaped magnet 31 is provided so as
to be fixed to the bottom 21 in the groove 24 of the yoke 20, and a ring-shaped plate 32 made of
a magnetic material is fixed to the end face of the magnet 31. There is. A magnetic gap is formed
between the inner peripheral surface of the outer peripheral wall 22 opposed to each other and
the outer peripheral surface of the plate 32, and the outer peripheral surface of the central
cylindrical portion 23 opposed to each other and the inner peripheral surface of the plate 32. A
magnetic gap is formed between them. A ring-shaped diaphragm support 40 is attached to the
front outer edge portion of the outer peripheral wall 22 of the yoke 20. A ring-shaped projection
41 is formed radially inward of the support end face of the diaphragm support 40.
[0017]
The convex portion 61a of the inner spacer 61 adhesively fixed to the diaphragm 10 is fitted to
the concave portion 23a formed on the end face of the central cylindrical portion 23 of the yoke
20, and the inner edge of the outer spacer 62 adhesively fixed to the diaphragm 10 The inner
spacer 61 is adhered and fixed to the center cylindrical portion 23 of the yoke 20 and the outer
spacer 62 is adhered and fixed to the support end face of the diaphragm support 40 in a state
where the projection 41 abuts on the projection 41. The radial direction of the diaphragm 10
with respect to the yoke 20 (drawing by the fitting of the projection 61a of the inner spacer 61
with the recess 23a of the central cylindrical portion 23 and the contact of the inner edge of the
outer spacer 62 with the projection 41 of the vibration support 40 In the left and right direction,
the position is regulated. Also, the thickness of the inner spacer 61 is set so as to match the total
thickness of the outer spacer 62 and the diaphragm support 40, and the thickness of these
makes the diaphragm 10 with respect to the yoke 20 in the front-rear direction ) Regulation of
position is made.
[0018]
In the magnetic gap between the outer circumferential surface of the central cylindrical portion
23 of the yoke 20 and the inner circumferential surface of the plate 32, the small diameter voice
coil 51 of the small diameter voice coil unit 50 And the large diameter voice coil 56 of the large
diameter voice coil unit 55 is properly arranged in the magnetic gap between the inner
peripheral surface of the outer wall 22 of the yoke 20 and the outer peripheral surface of the
plate 32. Ru.
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[0019]
In the speaker having the structure as described above, when an audio signal is applied to the
small diameter voice coil 51 and the large diameter voice coil 56, the magnet formed by the
small diameter voice coil 51, the large diameter voice coil 56, the yoke 20, the magnet 31 and
the plate 32 The magnetic action with the circuit causes the large diameter voice coil unit 50 and
the small diameter voice coil unit 55 to vibrate in the front-rear direction (axial direction of each
voice coil unit) according to the signal waveform of the audio signal.
When this vibration is applied to the main vibrating portion 11 of the diaphragm 10, the main
vibrating portion 11 vibrates together with the inner supporting portion 12 and the outer
supporting portion 14 integrated therewith. By the vibration of the diaphragm 10 (the main
vibrating portion 11, the inner vibrating portion 12 and the outer vibrating portion 14), a sound
such as music according to the audio signal is output from the speaker. Then, vibration in a
relatively high frequency band that can be generated by the small diameter voice coil unit 50 and
vibration in a relatively low frequency band that can be generated by the large diameter voice
coil unit 55 are desired in a relatively wide frequency band. It becomes an acoustic characteristic
from which sound pressure can be obtained.
[0020]
The vibration of the diaphragm 10 as described above will be examined in more detail.
[0021]
By setting the stiffness of the inner support 12 higher than the stiffness of the outer support 14,
the stiffness of the inner support 12 is higher than the stiffness of the outer support 14.
For this reason, the vibration by the small diameter voice coil unit 50 near the inner support 12
having high rigidity is smaller than the vibration by the large diameter voice coil unit 55 near the
outer support 14 having rigidity lower than the rigidity of the inner support 12 The influence of
the vibration by the small diameter voice coil unit 50 on the vibration by the large diameter voice
coil unit 55 can be reduced. In addition, since the rigidity of the inner support 12 close to the
small diameter voice coil unit 50 is relatively high, the vibration caused by the small diameter
voice coil unit 50 is less likely to be affected by the vibration caused by the large diameter voice
coil unit 55.
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[0022]
Thus, the influence of the vibration by the small diameter voice coil unit 50 on the vibration by
the large diameter voice coil unit 55 is reduced, and the vibration by the small diameter voice
coil unit 50 is less susceptible to the vibration by the large diameter voice coil unit 55. The
mutual interference between the vibration by the voice coil unit 50 and the vibration by the large
diameter voice coil unit 55 is reduced. As a result, resonance and distortion caused by mutual
interference of those vibrations can be suppressed, and as shown in FIG. 3, stable acoustic
characteristics can be obtained in a relatively wide frequency band.
[0023]
In the relatively high frequency band, the sound pressure level is less likely to decrease even if
the vibration amplitude is lower than in the relatively low frequency band. For this reason, even if
the vibration in the relatively high frequency band by the small diameter voice coil unit 50 is
relatively small, it is possible to obtain the necessary sound pressure level in that frequency band.
[0024]
In the embodiment described above, the stiffness of the inner support portion 12 is made higher
than the stiffness of the outer support portion 14 by making the radius of curvature of the inner
support portion 12 smaller than the radius of curvature of the outer support portion 14. The
stiffness of the inner support 12 can also be increased by changing the shape other than the
above, or by changing the material.
[0025]
As described above, the speaker according to the present invention has the effect of being able to
minimize the mutual interference between the vibration by the small diameter voice coil and the
vibration by the large diameter voice coil, and is arranged concentrically It is useful as a speaker
provided with two voice coils of different diameters.
[0026]
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It is an AA sectional view in Drawing 1 of a top view of a speaker concerning an embodiment of
the invention.
It is a figure which shows the sound pressure-frequency characteristic of the speaker of the
structure shown to FIG.1 and FIG.2.
It is a figure which shows an example of the sound pressure-frequency characteristic of the
conventional speaker.
Explanation of sign
[0027]
DESCRIPTION OF SYMBOLS 10 diaphragm 11 main vibration part 12 inner support part 13 flat
part 14 outer support part 20 yoke 21 bottom part 22 outer peripheral wall part 23 central
cylindrical part 23a recessed part 31 magnet 32 plate 40 diaphragm support 41 protrusion 50
small diameter voice coil unit 51 small diameter Voice coil 52 Small diameter bobbin 55 Large
diameter voice coil unit 56 Large diameter voice coil 57 Large diameter bobbin 61 Inner spacer
61a Convex part 62 Outer spacer
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