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JP2011176725

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DESCRIPTION JP2011176725
A speaker unit is covered by a protective cover when the speaker is not in use, and is protected
from impact, dust, and the like. SOLUTION: When the speaker unit 3 is covered by a protective
cover 12, the sub enclosure 4 is moved to the inside of the main enclosure 1 via a drive gear 8
and a rack gear 6 by a drive motor 7. Then, the protective cover 12 is moved along the outer
surface of the main enclosure 1 to the front of the middle to high-tone speaker unit 3. The
rotation of the drive motor 13 rotates the roller counterclockwise to move the protective cover
12 in the arrow direction. When the movement of the protective cover 12 is completed, the
protective cover 12 completely closes the front surface of the middle to high-tone speaker unit 3.
[Selected figure] Figure 4
Speaker device
[0001]
The present invention relates to a speaker device having a movable protective cover.
[0002]
Conventionally, in a general speaker device, a protective cover made of cloth such as saran net is
made to be removable from the speaker enclosure so as to protect the speaker unit, particularly
the speaker cone, and for protection from dust and the like. It is supposed to be provided.
[0003]
In addition, in order to protect the speaker, there is also known one configured to close the
shutter when the speaker is not sounded as in Patent Document 1.
02-05-2019
1
[0004]
Furthermore, as shown in Patent Document 2, there is a case where a shutter of the interposition
type covering the front surface is disposed.
When the sound is output from the speaker, the direction of the blind is changed to allow the
sound of the speaker to pass, and when the sound is not output from the speaker, the blind is
closed to protect the speaker from dust and the like.
[0005]
Japanese Patent Application Laid-Open No. 6-121384 Japanese Utility Model Application
Publication No. 5-39094
[0006]
For example, in Patent Document 1, a bellows-like protective cover having a shutter structure is
provided from the speaker enclosure so as to cover the speaker when the speaker is not in use.
However, since the protective cover covering the speaker passes through the front surface of the
speaker, the speaker is disposed deeper than the enclosure.
Therefore, there is a problem that the sound emitted from the speaker causes diffraction of the
sound in the shutter groove or the corner of the recessed speaker, and the sound output from the
speaker is disturbed.
[0007]
Further, in Patent Document 2, by adjusting the angle of each of the interdigital shutters
disposed in the speaker enclosure, the lid is opened or closed in use and storage of the speaker.
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2
However, since the interdigital shutter is at the front of the speaker when the speaker is used, the
sound from the speaker does not pass sufficiently, and similarly, there is a problem that the
sound from the speaker is disturbed due to the diffraction of the sound.
[0008]
An object of the present invention is to solve the above-mentioned problems, and to provide a
speaker device in which even when a protective cover is provided, the protective cover is
removed at the time of sound generation and no sound diffraction occurs and sound is not
disturbed. .
[0009]
A speaker device according to the present invention for achieving the above object comprises a
speaker unit inside a sub enclosure, enabling the sub enclosure to move back and forth relative
to a main enclosure, and when the speaker is not used The interior of the enclosure is moved
backward, and a protective cover is provided to cover the front of the speaker unit.
[0010]
According to the speaker device of the present invention, the protective cover is housed outside
the main enclosure or inside the main enclosure when the speaker is used.
The speaker at the time of sounding protrudes from the surface of the main enclosure, and the
sound emitted from the speaker can be generated without any reflection of the sound by the
main enclosure or diffraction of the sound, and the sound from the speaker being hardly
disturbed.
[0011]
When the speaker is not in use, the protective cover protects the speaker cone from accidental
damage and protects the speaker unit from dust and the like.
[0012]
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FIG. 2 is a cross-sectional view of the speaker device of Embodiment 1 when the speaker is used.
It is a perspective view at the time of speaker use.
It is sectional drawing of the initial state at the time of speaker non-use. It is sectional drawing of
the state which started the rotational movement of a protective cover. It is sectional drawing of
the state which closed the protective cover. It is a perspective view of the state at the time of
speaker accommodation. FIG. 13 is a front view of a normal state when using the speaker of
Example 2; It is sectional drawing seen from the side at the time of speaker use of a speaker
apparatus. It is sectional drawing seen from the upper surface of the normal state at the time of
speaker use. It is sectional drawing seen from the side of the state at the time of non-use of a
speaker. It is sectional drawing seen from the upper surface of the state at the time of non-use of
a speaker. It is a front view of a state where the shutter is closed when the speaker is not in use.
It is the sectional view seen from the side of the state where the shutter closed in the state at the
time of non-use of a speaker. It is sectional drawing seen from the upper surface of the state
which the shutter closed in the state at the time of non-use of a speaker.
[0013]
The present invention will be described in detail based on the illustrated embodiments.
[0014]
FIG. 1 is a cross-sectional view of the speaker device according to the first embodiment when the
speaker is used, and FIG. 2 is a perspective view.
A bass speaker unit 2 called a woofer is disposed substantially at the center of the spherical main
enclosure 1, and a radiation direction of the sound is coaxially disposed in front of the bass
speaker unit 2. The high-pitched speaker unit 3 is projected.
[0015]
The speaker unit 3 for middle to high sound is fixed to the front of a sub enclosure 4 whose back
is hemispherical, and a speaker cone 2 a consisting of a diaphragm of the speaker unit 2 for bass
is provided behind the sub enclosure 4 with a gap. ing.
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4
[0016]
The sub enclosures 4 are provided with moving plates 5 in parallel at upper and lower portions
behind the sub enclosures 4, and the sub enclosures 4 are movable in the front-rear direction
with respect to the main enclosure 1.
A rack gear 6 provided on the surface of the movable plate 5 is engaged with a drive gear 8
driven by a drive motor 7 fixed to the main enclosure 1. The rotation of the drive gear 8 causes
the moving plate 5 to move forward and backward via the rack gear 6, and the fitting of the drive
gear 8 and the rack gear 6 is biased by the roller 9.
[0017]
The space between the speaker cone 2a and the back plate 4a of the sub enclosure 4 is a space,
and the sound output from the bass speaker unit 2 is an opening 11 for the low sound provided
in an arc shape in the sub enclosure 4 via this space. It is released from the outside.
[0018]
A protective cover 12, which is a shutter for protecting the front surface of the middle to hightone speaker unit 3, is provided around the main enclosure 1, and the protective cover 12 has an
arc shape with a predetermined width.
The main enclosure 1 is provided with a drive motor 13 and a roller 14 for rotationally driving
the protective cover 12. During use of the speaker device, the protective cover 12 is located on
the rear outside of the main enclosure 1 and there is no shield blocking sound in front of the
middle to high-tone speaker unit 3. The main enclosure 1 is also provided with a detection switch
15 for detecting the protective cover 12 at a predetermined position.
[0019]
When the speaker device is not in use, the protective cover 12 is rotationally moved to the front
of the bass speaker unit 2. As a result, the bass opening portion 11 for outputting the bass
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produced by the bass speaker unit 2 is closed, and the speaker cone 3a of the middle-highpitched speaker unit 3 is protected, and the bass of the bass speaker unit 2 is protected. Protect
the speaker cone 2a.
[0020]
FIG. 3 shows a state in which the speaker device is not in use, and shows an initial state before
moving the protective cover 12 to the front surface of the middle to high-tone speaker unit 3.
The sub enclosure 4 is moved to the inside of the main enclosure 1 through the drive gear 8 and
the rack gear 6 by the drive motor 7.
[0021]
FIG. 4 shows a state in which the protective cover 12 has started to be moved to the front of the
middle to high-tone speaker unit 3 along the outer surface of the main enclosure 1. The rotation
of the drive motor 13 causes the roller 14 to rotate in the counterclockwise direction, and the
protective cover 12 is in the middle of moving in the counterclockwise direction indicated by the
arrow.
[0022]
FIG. 5 is a cross-sectional view of a state in which the movement of the protective cover 12 is
completed and the front surface of the middle to high-tone speaker unit 3 is completely closed,
and FIG. 6 is a perspective view thereof. At this time, the detection switch 15 is pressed by the
protective cover 12 to detect that the protective cover 12 is closed, and the rotation of the drive
motor 13 is stopped.
[0023]
In this state, it is possible to cover the low frequency opening 11 and the front surface of the
middle to high frequency speaker unit 3 with the protective cover 12 to protect the speaker
cones 2a and 3a from dust, accidental accidents from the outside, and the like.
[0024]
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In the first embodiment, the operation of the sub enclosure 4 and the protective cover 12 is
performed by the drive motor, but other wires, a linear motor, a link or the like can also be used
as a drive source.
Although such sub enclosures 4 are moved automatically, they can also be performed manually.
[0025]
FIG. 7 is a front view of the speaker apparatus of the second embodiment when the speaker is
used, FIG. 8 is a cross-sectional view as viewed from the side, and FIG. 9 is a cross-sectional view
as viewed from above. A sub enclosure 22 is built in a box-shaped main enclosure 21, and the
sub enclosure 22 can be moved forward and backward with respect to the main enclosure 21 via
upper and lower rollers 23. The middle and high-pitched speaker unit 24 is provided on the front
upper portion of the sub enclosure 22, and the bass speaker unit 25 is disposed on the lower
portion thereof.
[0026]
Guide grooves 26 are provided in both side surfaces of the main enclosure 21, and flexible
protective covers 27 made of, for example, bellows are accommodated in the respective guide
grooves 26. A drive motor 28 is provided at the center of the inside of the main enclosure 21,
and a screw screw 30 is projected to the drive motor 28 via a reduction gear unit 29. Further, a
screw screw receiver 31 is provided at the rear of the sub enclosure 22, and a screw 30 is
screwed into the screw screw receiver 31.
[0027]
For driving each protective cover 27, a drive roller 32 is disposed in close contact with the
protective cover 27 on the side of the main enclosure 21 between the main enclosure 21 and the
sub enclosure 22 on both sides. The drive roller 32 is rotated by the drive motor 33.
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[0028]
In the state of use, neither the protective cover 27 nor the cover is provided on the front surface
of the middle to high-pitched speaker unit 24 or the low-pitched speaker unit 25. Further, at this
time, since the speaker unit 24 for middle and high sound and the speaker unit 25 for low
frequency are protruded from the main enclosure 21 by the sub enclosure 22, no sound
diffraction occurs and the sound can be faithfully reproduced.
[0029]
FIG. 10 is a cross-sectional view seen from the side of a state in the middle of closing the
protective cover 27, and FIG. 11 is a cross-sectional view seen from the top. The drive motor 28
rotates, the rotational drive is transmitted to the reduction gear unit 29, and the screw 30
rotates. By the rotation of the screw 30, the sub-enclosure 22 is smoothly moved rearward by the
roller 23 via the screw-screw receiver 31 and accommodated in the main enclosure 21.
[0030]
FIG. 12 is a front view of the front of the speaker apparatus with the protective cover 27 closed
when not in use, FIG. 13 is a cross-sectional view as viewed from the side, and FIG. 14 is a crosssectional view as viewed from above. The speaker unit 25 for bass and the speaker unit 24 for
mid-high range are covered.
[0031]
As shown in FIGS. 10 and 11, the sub enclosure 22 is moved backward to form a space for
closing the protective cover 27 on the front of the speaker device.
By rotating the drive motor 33, the drive roller 32 is rotated, and the protective covers 27
disposed on the left and right are guided by the guide groove 26 to move forward. As a result,
the protective cover 27 is moved from the both sides to the front surface portions of the middle
to high-pitched speaker unit 24 and the low-pitched speaker unit 25 to be closed.
[0032]
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When the speaker device is used, the reverse movement causes the protective cover 27 to open
and be stored in the guide groove 26 so that the middle high / high sound speaker unit 24 and
the low frequency speaker unit 25 appear to generate a good sound. it can.
[0033]
1, 21 main enclosure 2, 25 bass speaker unit 3, 24 mid-high pitch speaker unit 5, 22 sub
enclosure 11 bass hole 12, 27 protective cover
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