JP2018056747

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DESCRIPTION JP2018056747
PROBLEM TO BE SOLVED: To provide a listener who is positioned on the front panel side of a
passive radiator mounted speaker provided with a passive radiator on the opposite surface of a
speaker casing in a backrest, by providing a powerful bass sound than before. SOLUTION: The
present invention is provided with a first passive radiator 21 and a second passive radiator 22
which resonate by utilizing air vibration in a casing 10 of the speaker, respectively, in a state of
being opposed to the opposing surfaces 11 and 12 of the casing 10. The present invention
relates to a passive radiator mounted speaker 1 including a reflecting member 40 at a position
facing the second passive radiator 22 provided on one surface 12 of the facing surfaces at an
interval in the outward direction. [Selected figure] Figure 1
Passive radiator mounted speaker
[0001]
The present invention relates to a speaker equipped with a passive radiator.
[0002]
Generally, small-sized speakers do not easily emit bass, and so a bass reflex system, a passive
radiator system, and the like are known as methods for effectively producing bass.
The passive radiator is a speaker unit that removes an electromagnetic circuit from the speaker
unit and operates using air vibration in the housing of the speaker. Passive radiators are used for
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small-sized portable speakers and the like because they resonate at a fixed frequency and can
produce powerful deep bass by mainly amplifying and reinforcing the bass range (for example,
patent documents See 1).
[0003]
FIG. 7 shows a front perspective view (7A) and a rear perspective view (7B) of a speaker
equipped with a conventionally known passive radiator.
[0004]
The conventional passive radiator mounted speaker 100 shown in FIG. 7 has a passive radiator
121 on the opening side of a housing 101 and front panels provided with speaker units 131 and
131 on both left and right sides of the passive radiator 121 in a front view. 111 is provided.
The passive radiator mounted speaker 100 includes a rear panel 112 on the opposite side (back
side) to the front panel 111. The rear panel 112 includes the passive radiator 122 of the same
type at a position facing the passive radiator 121 on the front panel 111 side. As described
above, the passive radiator mounting type speaker 100 includes the passive radiators 121 and
122 one on each side of the housing 101.
[0005]
JP, 2009-232040, A
[0006]
However, the passive radiator mounting type speaker 100 having the above-described structure
has the following problems.
When the passive radiator mounting type speaker 100 is placed in a wide space and the front
panel 111 side listens to the sound, the sound from the passive radiator 122 on the rear panel
112 side escapes to the rear side, and the front panel 111 side The problem is that it is difficult
for the listener to get in the ear. As a result, the volume of the deep bass becomes insufficient.
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[0007]
The present invention has been made to solve the above-described problems, and a listener who
is positioned on the front panel side of a passive radiator mounted speaker provided with a
passive radiator on the opposite surface of the speaker housing is back-mounted. The aim is to
provide a more powerful bass.
[0008]
A passive radiator mounting type speaker concerning one embodiment for achieving the abovementioned object makes the 1st passive radiator and the 2nd passive radiator which resonate
using air vibration in the housing of a speaker on the opposite side of a housing, respectively. In
order to prepare for back-to-back alignment, a reflecting member is provided at a position facing
the second passive radiator provided on one of the opposing surfaces at an interval in the
outward direction.
[0009]
In the passive radiator mounted speaker according to another embodiment, the reflecting
member may be reciprocally movable from a first position covering the second passive radiator
to a second position separating from the second passive radiator.
[0010]
In a passive radiator mounted speaker according to another embodiment, the reflecting member
may also be provided with a parallel reflecting plate parallel to one surface.
[0011]
In the passive radiator mounted speaker according to another embodiment, the reflecting
member also includes a left reflecting plate and a right reflecting plate that reflect the sound
from the second passive radiator to the left and right sides of the housing, respectively. good.
[0012]
In the passive radiator mounting type loudspeaker according to another embodiment, the
reflecting member may further include an upper reflecting plate that reflects the sound from the
second passive radiator to the upper side of the housing.
[0013]
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In the passive radiator mounted speaker according to another embodiment, the reflecting
member may further include a lower reflecting plate that reflects the sound from the second
passive radiator to the lower side of the housing.
[0014]
According to the present invention, it is possible to provide a listener who is positioned on the
front panel side of a passive radiator mounted speaker provided with a passive radiator on the
opposite surface of the speaker housing in a backrest, with a more powerful heavy bass than
before.
[0015]
FIG. 1 is a front perspective view (1A) of the passive radiator mounted speaker according to the
first embodiment in a state in which the reflection member is pulled backward from the rear
panel side, and a rear perspective view in a state of drawing the reflection member ( 1B) shows a
front perspective view (1C) of the state where the reflection member is stored toward the rear
panel and a rear perspective view (1D) of the state where the reflection member is stored toward
the rear panel.
FIG. 2 shows a cross-sectional structure of the first passive radiator in a state of being cut at a
substantially central portion in the longitudinal direction of the front panel of the speaker of FIG.
FIG. 3 is a rear perspective view (3A) of the passive radiator mounted speaker according to the
second embodiment in which the reflecting member is accommodated toward the rear panel, and
the rear perspective view of the reflecting member drawn backward (3B) Rear perspective view
(3C) of the state which changed each angle of the left side reflecting plate and the right side
reflecting plate from the state of (3B) and (3B) is each shown.
FIG. 4 is a rear perspective view (4A) of the passive radiator mounted speaker according to the
third embodiment in which the reflecting member is accommodated toward the rear panel, and
the rear perspective view of the reflecting member drawn backward (4B) The rear perspective
view (4C) of the state which changed the angle of the upper side reflecting plate from the state of
(4 B) and (4 B) is shown, respectively.
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FIG. 5 is a front perspective view (5A) of the passive radiator mounted speaker according to the
fourth embodiment with the reflecting member pulled out toward the rear, a rear perspective
view (5B) with the reflecting member drawn out, The front perspective view (5C) of the state
which accommodated the reflective member toward the rear surface panel, and the rear
perspective view (5D) of the state which accommodated the said reflective member toward the
rear surface panel are shown, respectively.
FIG. 6 is a front perspective view (6A) of the passive radiator mounted speaker according to the
fifth embodiment with the reflecting member pulled out toward the rear, a rear perspective view
(6B) with the reflecting member drawn out, The front perspective view (6C) of the state which
accommodated the reflective member toward the rear surface panel, and the rear perspective
view (6D) of the state which accommodated the said reflective member toward the rear surface
panel are shown, respectively.
FIG. 7 shows a front perspective view (7A) and a rear perspective view (7B) of a speaker
equipped with a conventionally known passive radiator.
[0016]
Hereinafter, each embodiment of a passive radiator loading type loudspeaker concerning the
present invention is described, referring to drawings.
[0017]
First Embodiment FIG. 1 is a front perspective view (1A) of the passive radiator mounted speaker
according to the first embodiment in a state in which the reflecting member is pulled backward
from the rear panel side, the reflecting member is pulled out A rear perspective view (1B) of the
state, a front perspective view (1C) of a state in which the reflecting member is stored toward the
rear panel, and a rear perspective view (1D) in a state of storing the reflecting member toward
the rear panel; It shows each.
[0018]
The passive radiator mounting type speaker (hereinafter, simply referred to as a "speaker") 1 is
provided with a housing 10 which has a substantially rectangular parallelepiped shape and
which has a space therein.
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The housing 10 includes a front panel 11 provided on one of six surfaces of the housing 10
(here, also referred to as front ), and a surface facing the front panel 11 (here, also referred
to as rear ). And the rear panel 12 provided in FIG.
As main materials of the housing 10, polyamide, polypropylene, polyethylene terephthalate,
acrylic resin, polybutylene terephthalate, polycarbonate, polyphenylene sulfide, ABS resin and the
like can be suitably exemplified.
Among the above resins, a particularly preferred resin is polycarbonate.
The housing 10 may be made of FRP in which glass fiber, carbon fiber, etc. are dispersed in the
above-mentioned resin. Furthermore, the housing 10 may be made of metal such as aluminum or
wood. The same applies to the following embodiments.
[0019]
The front panel 11 mounts the first passive radiator 21 substantially at the center of the front
panel 11 and one speaker unit 31 on each of the left and right sides of the first passive radiator
21 in front view. . The first passive radiator 21 and the speaker units 31, 31 are embedded in the
through holes of the front panel 11 so that the side outputting the sound is directed outward.
[0020]
On the other hand, the rear panel 12 mounts the second passive radiator 22 in a substantially
central portion in a front view toward the rear panel 12. The second passive radiator 22 is
embedded in the through hole of the rear panel 12 so that the side outputting the sound is
directed outward. In the first embodiment and each of the subsequent embodiments, the second
passive radiator 22 has substantially the same shape as the first passive radiator 21. However,
the second passive radiator 22 may have a size, shape or structure different from that of the first
passive radiator 21. The first passive radiator 21 and the second passive radiator 22 are both
speaker units that resonate using air vibration in the housing 10 of the speaker 1. The speaker 1
is provided with a first passive radiator 21 and a second passive radiator 22 on the opposite
surface of the housing 10 in a back-to-back manner. The configuration of the first passive
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radiator 21 and the second passive radiator 22 will be described later.
[0021]
The speaker 1 is provided with a reflecting member 40 at a position facing the second passive
radiator 22 with an interval in the outward direction. The reflective member 40 is preferably
reciprocable from a first position covering the second passive radiator 22 to a second position
away from the second passive radiator 22. The reflection member 40 is a substantially L-shaped
plate-like member, and connects the parallel reflection plate 41 parallel to the rear panel 12 and
the substantially horizontal bottom plate 42 which can be stored and drawn on the bottom
surface of the speaker 1 at substantially a right angle It will When the reflecting member 40 is
moved to the first position, the bottom plate 42 almost overlaps the bottom of the housing 10.
The parallel reflection plate 41 covers the second passive radiator 22 and is in contact with the
rear panel 12. The parallel reflection plate 41 is preferably a plate having a larger area than the
second passive radiator 22 so as to completely cover the second passive radiator 22.
[0022]
When the reflecting member 40 is moved to the second position, the bottom plate 42 is pulled
back from the bottom of the housing 10. In addition, the parallel reflection plate 41 is separated
from the rear panel 12 by a predetermined distance while maintaining substantially parallel to
the second passive radiator 22. As a result, the sound output from the second passive radiator 22
reaches the parallel reflection plate 41, is reflected by the parallel reflection plate 41, turns
forward, and is transmitted to the ear of the listener facing the front panel 11. The main material
of the reflecting member 40 can be selected from the above-mentioned candidates for the main
material of the housing 10. The reflecting member 40 is preferably made of a material that does
not easily resonate. The parallel reflection plate 41 may attach rubber, felt, sponge or paper to
the surface facing the second passive radiator 22 to obtain a reflected sound obtained by cutting
a sound of a specific frequency. About the above-mentioned material or composition of reflecting
member 40, it is the same also in various reflecting members 40a, 40b, 40c, and 40d in each
subsequent embodiment.
[0023]
The reflecting member 40 may be configured to be separable from the housing 10, and in this
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case, the bottom plate 42 may be configured to be detached from the bottom of the housing 10.
In addition, the reflecting member 40 may be configured not to be easily separated from the
housing 10, in which case the bottom plate 42 is provided with a stopper for holding the tip
portion of the bottom plate 42 at the bottom of the housing 10 It is good. The reflection member
40 is configured to be able to adjust the distance between the parallel reflection plate 41 and the
second passive radiator 22. Therefore, by adjusting the distance, the output of the reflected
sound is changed to thereby output the desired tone to the listener. It can be done.
[0024]
FIG. 2 shows a cross-sectional structure of the first passive radiator in a state of being cut at a
substantially central portion in the longitudinal direction of the front panel of the speaker of FIG.
[0025]
Here, each structure of the first passive radiator 21 and the front panel 11 will be described.
In addition, since the 2nd passive radiator 22 is the same structure as the 1st passive radiator
21, only the structure of a 1st passive radiator is demonstrated here, and the overlapping
description is abbreviate ¦ omitted. Moreover, FIG. 2 shows a state in which the speaker units 31,
31 are removed. The following contents of the first passive radiator 21 and the front panel 11
are the same in the following embodiments.
[0026]
The first passive radiator 21 includes a diaphragm 50 disposed substantially at the center of the
inside thereof, and an elastic flange 51 formed between the outer periphery of the diaphragm 50
and the front panel 11 and having a hollow structure. The diaphragm 50 is made of a metal such
as iron, stainless steel or tungsten steel, and more preferably made of a metal having a high
specific gravity. As a constituent material of the elastic flange 51, preferably, silicone rubber,
urethane rubber, ethylene propylene rubber, butyl rubber, ethylene propylene diene rubber, and
nitrile rubber can be mentioned. Also, the elastic flange 51 may be configured using an esterbased, styrene-based, olefin-based or fluorine-based thermoplastic elastomer, a composite
thereof, or the like. Among these materials, silicone rubber is particularly preferred. The first
passive radiator 21 resonates with the vibration of the speaker units 31 to vibrate the diaphragm
50. In order for the diaphragm 50 to vibrate normally, the elastic flange 51 needs to be
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configured to freely vibrate the diaphragm 50 without disturbing the vibration of the diaphragm
50 while holding the diaphragm 50 firmly. . The elastic flange 51 is not limited to one having a
hollow structure, and may have a solid structure.
[0027]
The elastic flange 51 is a component that connects the panel main body 54 forming the main
skeleton of the front panel 11 and the diaphragm 50. The elastic flange 51 includes a first flange
52 having a hollow structure, and a second flange 53 positioned closer to the panel main body
54 than the first flange 52. The first flange 52 is a component having a hollow ring shape, and
the inside thereof is connected to the diaphragm 50, and the outside thereof is connected to the
second flange 53. The second flange 53 is a component having a solid ring shape, and the inside
thereof is connected to the first flange 52 and the outside thereof is connected to the panel main
body 54. The first flange 52 and the second flange 53 are connected in a thin loop area. For this
reason, the diaphragm 50 can vibrate in the front-rear direction with respect to the opening
surface of the housing 10 in the free state as much as possible with respect to the second flange
53.
[0028]
The front panel 11 is provided with a seal member 55 at its outer periphery. The seal member 55
eliminates the gap between the inner peripheral edge of the opening of the housing 10 and the
front panel 11 and contributes to bringing the front panel 11 into close contact with the opening
of the housing 10. As a result, the vibration of the air in the case 10 is unlikely to leak to the
outside of the case 10 and is reliably transmitted to the first passive radiator 21 and the second
passive radiator 22.
[0029]
Second Embodiment Next, a passive radiator mounted speaker according to a second
embodiment will be described. In the second embodiment, parts in common with the first
embodiment will be substituted by the descriptions in the first embodiment, and duplicate
descriptions will be omitted.
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[0030]
FIG. 3 is a rear perspective view (3A) of the passive radiator mounted speaker according to the
second embodiment in which the reflecting member is accommodated toward the rear panel, and
the rear perspective view of the reflecting member drawn backward (3B) Rear perspective view
(3C) of the state which changed each angle of the left side reflecting plate and the right side
reflecting plate from the state of (3B) and (3B) is each shown.
[0031]
The configurations of the inner and outer surfaces of the housing 10 of the speaker 1 are
common to those of the first embodiment.
The speaker 1 is provided with a reflecting member 40 a at a position facing the second passive
radiator 22 with an interval in the outward direction. The reflecting member 40 a is preferably
reciprocally movable from a first position covering the second passive radiator 22 to a second
position separating rearward from the second passive radiator 22. The reflecting member 40 a is
a substantially L-shaped plate-like member, and includes a left reflecting plate 61 and a right
reflecting plate 62 capable of covering the second passive radiator 22 in the stored state. In this
embodiment and the following embodiments, the left side is referred to as "left side" and the right
side is referred to as "right side" toward the rear panel 12, unless otherwise stated. The left
reflecting plate 61 is rotatable at least rearward about an axis 64 on the right side thereof. In
addition, the right reflecting plate 62 can be pivoted at least rearward about an axis 65 on the
left side thereof. Here, since it is at least , the left reflector 61 and / or the right reflector 62
may be rotatable both backward and forward around the axis 64 and / or the axis 65.
[0032]
The shaft 64 and the shaft 65 preferably stand close to each other and substantially
perpendicularly to the substantially central portion in the left-right direction of the plate formed
of the left reflector 61 and the right reflector 62. The shaft 64 and the shaft 65 are rotatably
connected at substantially right angles with respect to a substantially horizontal bottom plate 63
which can be stored and drawn at the bottom of the speaker 1. The bottom plate 63 is a plate
corresponding to the bottom plate 42 of the first embodiment. When the reflecting member 40 a
is moved to the first position, the bottom plate 63 substantially overlaps the bottom of the
housing 10. The left reflector 61 and the right reflector 62 cover the second passive radiator 22
and are in contact with the rear panel 12. The plate formed of the left side reflector 61 and the
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right side reflector 62 is preferably a plate having a larger area than the second passive radiator
22 so as to completely cover the second passive radiator 22.
[0033]
When the reflecting member 40 a is moved to the second position, the bottom plate 63 is pulled
back from the bottom of the housing 10. Further, the left reflector 61 and the right reflector 62
are separated from the rear panel 12 by a predetermined distance while maintaining
substantially parallel to the second passive radiator 22. From this state, as shown in (3C), the left
reflector 61 is rotated backward about the axis 64 (that is, in the direction opposite to the hand
of the watch when the axis 64 is viewed from above), and the right reflector 62 is The sound
output from the second passive radiator 22 is transmitted to the left reflector 61 and the right
reflector 62 when rotated backward about the axis 65 (that is, in the same direction as the hand
of the watch when the After reaching, it is reflected, turns to the left and right of the housing 10,
and is transmitted to the ear of the listener facing the front panel 11. The main material of the
reflecting member 40a can be selected from the above-mentioned candidates of the main
materials of the housing 10 described above. The reflecting member 40a is preferably made of a
material that is difficult to resonate. The left reflector 61 and the right reflector 62 may be made
of rubber, felt, sponge or paper attached to the surface facing the second passive radiator 22 to
obtain a reflected sound with a specific frequency cut. good.
[0034]
The reflecting member 40 a may be configured to be separable from the housing 10, and in this
case, the bottom plate 63 may be configured to be detached from the bottom of the housing 10.
The reflecting member 40a may be configured not to be easily separated from the housing 10. In
that case, the bottom plate 63 is provided with a stopper for holding the tip portion of the
bottom plate 63 at the bottom of the housing 10. It is good. The reflecting member 40 a includes
a left reflecting plate 61 and a right reflecting plate 62 that reflect the sound from the second
passive radiator 22 to the left and right sides of the housing 10 respectively. Furthermore, the
left reflector 61 and the right reflector 62 are configured to be adjustable in angle. Therefore, in
addition to the effect of the first embodiment, the speaker 1 can change the wraparound path of
the reflected sound by the adjustment, and according to the size of the room, the distance
between the listener and the speaker 1, etc. There is also an effect that the output of the deep
bass can be changed.
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[0035]
Third Embodiment Next, a passive radiator mounted speaker according to a third embodiment
will be described. In the third embodiment, the parts in common with the previous embodiments
are substituted by the descriptions in the previous embodiments, and duplicate explanations are
omitted.
[0036]
FIG. 4 is a rear perspective view (4A) of the passive radiator mounted speaker according to the
third embodiment in which the reflecting member is accommodated toward the rear panel, and
the rear perspective view of the reflecting member drawn backward (4B) The rear perspective
view (4C) of the state which changed the angle of the upper side reflecting plate from the state of
(4 B) and (4 B) is shown, respectively.
[0037]
The configurations of the inner and outer surfaces of the housing 10 of the speaker 1 are
common to those of the first embodiment.
The speaker 1 is provided with a reflecting member 40 b at a position facing the second passive
radiator 22 with an interval in the outward direction. The reflecting member 40 b is preferably
reciprocally movable from a first position covering the second passive radiator 22 to a second
position separating rearward from the second passive radiator 22. The reflecting member 40 b is
a substantially L-shaped plate-like member, and has a configuration similar to that of the
reflecting member 40 in the first embodiment. Unlike the reflecting member 40, the reflecting
member 40b includes an upper reflecting plate 71 that reflects the sound from the second
passive radiator 22 to the upper side of the housing 10. Further, the upper reflecting plate 71 is
rotatable at least rearward from a state perpendicular to the bottom plate 72 (a plate
corresponding to the bottom plate 42 in the first embodiment). Here, since it is at least , the
upper reflection plate 71 may be rotatable also on the housing 10 side. The parallel reflection
plate 41 of the reflection member 40 is fixed to the bottom plate 42 in a fixed angle, but the
upper reflection plate 71 of the reflection member 40 b is provided to be variable in angle to the
bottom plate 72. In order to realize this operation, the upper reflection plate 71 is held by the
bottom plate 72 so as to be rotatable about an axis 70 extending substantially horizontally. The
upper reflecting plate 71 preferably has a larger area than the second passive radiator 22, and
the bottom plate 72 may or may not be easily separated from the housing 10. Common to the
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first embodiment. The upper reflecting plate 71 may be made of a rubber, felt, sponge or paper
attached to the surface facing the second passive radiator 22 to obtain a reflected sound
obtained by cutting a sound of a specific frequency.
[0038]
The reflecting member 40 b can rotate the upper reflecting plate 71 backward to turn the
surface of the upper reflecting plate 71 facing the rear panel 12 upward, and the angle thereof
can also be adjusted. Therefore, in addition to the same effects as those of the first embodiment,
the speaker 1 can change the upward routing path of the reflected sound, and according to the
size of the room, the distance between the listener and the speaker 1, etc. There is also an effect
that the output of the deep bass can be changed.
[0039]
Fourth Embodiment Next, a passive radiator mounted speaker according to a fourth embodiment
will be described. In the fourth embodiment, the parts in common with the previous
embodiments are substituted by the descriptions in the previous embodiments, and duplicate
descriptions are omitted.
[0040]
FIG. 5 is a front perspective view (5A) of the passive radiator mounted speaker according to the
fourth embodiment with the reflecting member pulled out toward the rear, a rear perspective
view (5B) with the reflecting member drawn out, The front perspective view (5C) of the state
which accommodated the reflective member toward the rear surface panel, and the rear
perspective view (5D) of the state which accommodated the said reflective member toward the
rear surface panel are shown, respectively.
[0041]
The configurations of the inner and outer surfaces of the housing 10 of the speaker 1 are
common to those of the first embodiment.
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The speaker 1 is provided with a reflecting member 40c at a position facing the second passive
radiator 22 with an interval in the outward direction. The reflecting member 40 c is preferably
reciprocally movable from a first position covering the second passive radiator 22 to a second
position separating rearward from the second passive radiator 22. Unlike the reflective member
40 in the first embodiment, the reflective member 40c is not a substantially L-shaped plate-like
member. The reflection member 40 c includes a parallel reflection plate 81 corresponding to the
parallel reflection plate 41 in the first embodiment, and rods 82 and 82 connecting the parallel
reflection plate 81 and the rear panel 12. The parallel reflection plate 81 may attach rubber, felt,
sponge or paper to the surface facing the second passive radiator 22 so as to obtain a reflected
sound obtained by cutting a sound of a specific frequency. The rods 82, 82 are inserted into the
holes 83, 83 formed from the rear surface panel 12 toward the inside of the housing 10, and the
distance between the parallel reflection plate 81 and the rear surface panel 12 can be varied
freely. It is possible to move in 83.
[0042]
As described above, the parallel reflection plate 81 can be disposed to face the second passive
radiator 22 using the rods 82 and 82 instead of the bottom plate 42 of the first embodiment.
Since the speaker 1 does not include the bottom plate 42, in addition to the same effect as the
first embodiment, the sound from the second passive radiator 22 is reflected by the parallel
reflection plate 81 and then transmitted to the bottom of the housing 10 as well. It also has the
effect of being able to If the bottom of the speaker 1 is installed so as not to be in full contact
with the floor, the sound from the second passive radiator 22 can be transmitted to the listener's
ear located on the front panel 11 side via the bottom of the housing 10 as well. .
[0043]
Fifth Embodiment Next, a passive radiator mounted speaker according to a fifth embodiment will
be described. In the fifth embodiment, the parts in common with the previous embodiments are
substituted by the descriptions in the previous embodiments, and duplicate descriptions are
omitted.
[0044]
FIG. 6 is a front perspective view (6A) of the passive radiator mounted speaker according to the
fifth embodiment with the reflecting member pulled out toward the rear, a rear perspective view
(6B) with the reflecting member drawn out, The front perspective view (6C) of the state which
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accommodated the reflective member toward the rear surface panel, and the rear perspective
view (6D) of the state which accommodated the said reflective member toward the rear surface
panel are shown, respectively.
[0045]
The configurations of the inner and outer surfaces of the housing 10 of the speaker 1 are
common to those of the first embodiment.
The speaker 1 includes a reflecting member 40 d at a position facing the second passive radiator
22 at an interval in the outward direction. The reflecting member 40 d is preferably reciprocally
movable from a first position covering the second passive radiator 22 to a second position
separating rearward from the second passive radiator 22. The reflection member 40d does not
include a plate corresponding to the bottom plate 42 as the reflection member 40c in the fourth
embodiment, but includes rods 92 and 92 and a reflection plate 91 connected to the rods 92 and
92. The rods 92, 92 are inserted into the holes 93, 93 formed from the rear surface panel 12
toward the inside of the housing 10, and the distance between the reflecting plate 91 and the
rear surface panel 12 can be varied freely. It is possible to move inside.
[0046]
The reflection plate 91 is a bending plate in which the upper reflection plate 95 and the lower
reflection plate 96 are connected in the vertical direction by the boundary line 94. The upper
reflection plate 95 is an obliquely upward plate inclined rearward from the vertically upward
direction at the boundary line 94. The lower reflector 96 is an obliquely downward plate which is
inclined rearward from the vertically downward direction at the boundary line 94. The upper
reflection plate 95 is a plate that reflects the sound from the second passive radiator 22 to the
upper side of the housing 10. The lower reflection plate 96 is a plate that reflects the sound from
the second passive radiator 22 to the lower side of the housing 10. The upper reflector 95 and
the lower reflector 96 are made of rubber, felt, sponge or paper attached to the surface facing
the second passive radiator 22 so as to obtain a reflected sound obtained by cutting a sound of a
specific frequency. Also good.
[0047]
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As described above, since the speaker 1 does not include the bottom plate 42 and includes the
upper reflection plate 95 and the lower reflection plate 96, the sound from the second passive
radiator 22 is reflected by both reflection plates 95 and 96. Afterward, it can be effectively
transmitted to both the upper side and the lower side (= bottom) of the housing 10. Therefore, in
addition to the same effect as that of the first embodiment, the speaker 1 has a reflected sound
from the second passive radiator 22 of the second passive radiator 22 as compared with the
reflection member 40 c having the parallel reflection plate 81 in the fourth embodiment. It also
has the effect of easily reaching the listener without being affected.
[0048]
(Other Embodiments) The speaker 1 according to each embodiment of the present invention has
been described above, but the present invention is not limited to these embodiments, and can be
implemented with various modifications.
[0049]
The speaker 1 according to each of the above-described embodiments includes one first passive
radiator 21 and one second passive radiator 22, but may include a plurality of first passive
radiators 21 or second passive radiators 22.
The reflecting members 40, 40a, 40b, 40c, and 40d (referred to as "reflecting members 40 and
the like") are configured such that the distance between the housing 10 and the second passive
radiator 22 is variable. And may be fixed to the housing 10 in a state in which the distance
between the However, when the reflective member 40 and the like can be stored in the rear
panel 12 side of the housing 10, it is advantageous when the speaker 1 is carried.
[0050]
The reflecting members 40 and the like can change the distance steplessly from the position
closest to the rear panel 12 (first position) to the position farthest (second position). However,
the reflecting member 40 or the like may be a member capable of changing the distance
stepwise. The left reflector 61 and the right reflector 62 can rotate steplessly around the axes 64
and 65, respectively, but the angles may be changed stepwise. The reflecting plate 91 is a plate
in which each angle with respect to the vertical direction of the upper reflecting plate 95 and the
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lower reflecting plate 96 is fixed, but similarly to the left reflecting plate 61 and the right
reflecting plate 62 in the third embodiment, Each angle may be variable.
[0051]
In the fourth embodiment, the parallel reflection plate 81 may not be fixed to the rods 82, and
may be configured to be variable in angle in the upward and / or downward directions with
respect to the rods 82, 82. For example, the angle variable configuration can be realized by
providing a ball at each end of the rods 82 and 82 and providing the parallel reflection plate 81
with a recess that surrounds the ball in a non-fixed manner. Further, in the fifth embodiment, the
reflecting plate 91 may be configured to be variable in the upward and / or downward direction
with respect to the rods 92, 92 without being fixed to the rods 92, 92. As described above, by
providing a ball at each end of the rods 92 and 92 and by providing the reflecting plate 91 with a
recess that surrounds the ball in a non-fixed manner, the variable angle configuration can be
realized.
[0052]
Each of the above-described embodiments can arbitrarily combine some of their configurations
except in the case where they can not be combined. As an example, the speaker 1 may be
provided with a reflecting member including the parallel reflecting plate 41, the left reflecting
plate 61, and the right reflecting plate 62 by combining the first embodiment and the second
embodiment. In addition, as another example, combining the second embodiment and the fifth
embodiment, the left reflector plate 61 and the left reflector plate 61 are disposed on the left and
right of the reflector 91 (a plate composed of the upper reflector 95 and the lower reflector 96).
The speaker 1 may be provided with a reflection member provided with the right reflection plate
62 respectively.
[0053]
The present invention can be used for a speaker, particularly a small speaker.
[0054]
DESCRIPTION OF SYMBOLS 1 ... Speaker (passive radiator mounted type speaker) 10 ... Housing ¦
casing 11 ... Front panel (one of opposing surfaces) 12 ... Rear panel (It is one of opposing
surfaces, 21: first passive radiator, 22: second passive radiator, 40, 40a, 40b, 40c, 40d: reflecting
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member, 41, 81: parallel reflecting plate, 61: left reflector, 62: right reflector, 71, 95: upper
reflector, 96: lower reflector.
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