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JP2016032187

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DESCRIPTION JP2016032187
The present invention provides a small-sized speaker device with good design and operability,
and good sound quality. A housing, a two-channel speaker unit disposed on the left and right of
the top surface of the housing, a bass reflex port provided at the center in the left-right direction
of the chassis top, and a bass reflex connected to the bass reflex port And a duct. The housing
internally has one cavity for accommodating a two-channel speaker unit and a bass reflex duct.
The bass reflex duct is disposed between the two channel speaker units. [Selected figure] Figure
2
Speaker device
[0001]
The present invention relates to a stereo speaker device, and more particularly to a compact or
desktop speaker device.
[0002]
A general stereo speaker system has a speaker box for left and right channels, which are
arranged left and right (for example, see Patent Document 1).
For this reason, the installation area becomes large and it is unsuitable for installing on a
desktop.
03-05-2019
1
[0003]
Therefore, many integrated and miniaturized stereo speaker systems have been proposed more
than ever (for example, Patent Document 2). This conventional small stereo speaker system has a
laterally long shape, has speaker cavities on the left and right of the casing, and has a circuit
portion such as an operation portion and an amplifier in the center.
[0004]
Japanese Patent Application Laid-Open No. 09-098495
[0005]
Unexamined-Japanese-Patent No. 09-092345 gazette
[0006]
However, in the case of Patent Document 2, since the case is also internally divided into three
and three sections are required, there is a limit to miniaturization.
Also, the size of the speaker cavity was small relative to the size of the housing, making it difficult
to realize satisfactory sound quality.
In addition, the design also became horizontally long and the degree of freedom was not high.
[0007]
Moreover, the thing of the patent document 1 was the arrangement | positioning that the
operation part is on the upper side of a housing | casing and the speaker unit is provided ahead
for the front. In the case of a small speaker device, it is usual to provide the operation unit on the
upper side to allow the user to operate downward because the user's operation can not be
received by his own weight, but as a result, the speaker unit In many cases, a forward-looking
speaker is disadvantageous in that it is offset from the user's listening position or has a poor
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2
effect of spreading the sound in the room space.
[0008]
Therefore, an object of the present invention is to provide a small-sized speaker device having
good design and operability, and good sound quality.
[0009]
The speaker device according to the present invention is connected to a housing, a two-channel
speaker unit disposed on the left and right of the top surface of the housing, a bass reflex port
provided at the center in the left and right direction of the chassis top surface, and a bass reflex
port And a bass reflex duct.
The housing internally has one cavity for accommodating a two-channel speaker unit and a bass
reflex duct. The bass reflex duct is disposed between the two channel speaker units.
[0010]
In the above invention, the height of the housing may be twice or less the height (depth) of the
speaker unit, the upper surface of the housing may be inclined in the front direction, and the
bass reflex port may be provided on the front side of the upper surface of the housing The bass
reflex duct may be formed from the near side to the far side inside the housing. Furthermore, the
upper surface of the housing may further include an operation panel provided with an operation
element.
[0011]
According to the present invention, it is possible to realize a small-sized speaker device with good
operability and high sound quality.
[0012]
The external appearance perspective view of the speaker apparatus based on embodiment of this
invention The front view and side sectional view of a speaker apparatus The block diagram of the
electronic circuit of a speaker apparatus
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[0013]
Hereinafter, a speaker device according to an embodiment of the present invention will be
described with reference to the drawings.
FIG. 1 is an external perspective view of a speaker device according to an embodiment of the
present invention.
FIG. 2A is a front view of the panel surface, and FIG. 2B is a right side sectional view.
[0014]
The speaker device 1 is mainly used by placing it on a tabletop or bedside, and has a shape in
which a cylinder is cut short. The upper surface is a surface obtained by cutting a cylinder
perpendicularly to its central axis, and is substantially a perfect circle. On the other hand, the
bottom surface is a surface obtained by cutting a cylinder obliquely at an angle of about 70
degrees with respect to its central axis, and is elliptical. A tray-like bottom plate 10A is attached
to the bottom. Therefore, the side surface is inclined at about 70 degrees in accordance with the
cutting angle of the bottom surface, the lowest position is the position where it is installed facing
the user (front), and the highest position is located on the opposite side to the user Position
(back). As mentioned above, the diameter of the casing 10 which is a short cylinder is about 20
cm, the height on the back side is about 10 cm, and the space-saving size is obtained even if it is
placed on the tabletop or bedside, Low and stable.
[0015]
A donut shaped cover grill 12 having a circular opening 122 at its center is attached to the top of
the housing. Further, an operation panel 11 in which the opening 122 of the cover grill 12 is
fitted is provided at the center of the upper surface of the housing. The cover grill 12 comprises
a frame 120 and a grill net 121 stretched thereon. 2 shows a state in which only the frame 120
of the cover grille 12 is attached.
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[0016]
The frame 120 of the cover grille 12 has an opening 123 only at a portion that transmits sound
and light, and the other portions are covered by a plate-like member. The openings 123 are left
and right openings 123L and R facing the left and right speaker units 20 and 21, an opening
123C in front of the center facing the bass reflex port 14, and an opening on the left front facing
the display 22 which also serves as a digital watch. 123D is provided. As shown in FIG. 1, these
openings 123 are covered by the grill net 121 in use and can not be seen by the user. However,
as shown in FIG. 1, the light by the display of the display 22 is transmitted.
[0017]
As described above, on the upper surface of the housing 10, the speaker units 20 and 21 are
provided on the left and right, the bass reflex port 14 in the center, and the display 22 in front of
the left hand. The speaker units 20 and 21 are small full-range speakers, each having an aperture
of 4 centimeters, a rated input of 4 W, and a depth (height) of about 6 centimeters. Although the
speaker units 20 and 21 are disposed symmetrically in the left-right direction, they need to have
a depth (height) to accommodate the depths of the speaker units 20 and 21. It is attached to the
side. The bass reflex port 14 is formed in front of the center of the upper surface of the housing,
and the bass reflex duct 15 is connected to the bass reflex port 14. The bass reflex duct 15 is
bent in the depth direction of the housing 10 immediately inside the bass reflex duct 14 and
extends between the speaker units 20 and 21 to the near side of the rear side of the interior of
the housing 10.
[0018]
At the bottom of the rear side of the housing 10, a partition wall 10B for airtightly dividing the
cavity 100 in which the speaker units 20 and 21 and the bass reflex duct 15 and the circuit box
101 are provided. Circuit boards 25 and 26 are provided around the operation panel 11 in the
circuit box 101 and between the speaker units 20 and 21 in the cavity 101. An audio circuit is
mainly mounted on the circuit board 25 and includes an input unit such as an audio jack and a
DC jack. Further, on the circuit board 26, a control circuit including the control unit 50 (see FIG.
3) is mounted.
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[0019]
As described above, the speaker device 1 incorporates the electric circuit and the stereo speaker
units 20 and 21 in the small-sized housing 10 having a small height. Since the volume of the case
10 is not large, the cavid 100 is shared by the left and right speaker units 20 and 21 and the
bass reflex port 14 and the bass reflex duct 15 are also disposed at the center of the casing 10 to
provide left and right channels (left and right loudspeaker units 20 and 21 Shared by).
[0020]
In addition, the operation panel 11 is a circular panel fitted to the central opening 122 of the
donut-shaped cover grill 12. The shape of the operation panel 11 and the shape of the top
surface of the housing 10 (cover grille 12) are substantially similar and arranged concentrically.
A power switch 110 is provided at the center of the operation panel 11, and eight switches 111
are radially provided at the periphery of the operation panel 11. Eight switches 111 are a clock
switch, an alarm switch, a tuning up / down switch, a preset switch, a selection switch (pairing
switch), and a volume +/- switch, clockwise from the upper left. Also, four indicators 112 are
provided at the periphery between the selection switch and the volume switch. Each indicator
112 lights up when Bluetooth, analog input (AUX), FM radio (RADIO) is selected as an audio
input, or when an alarm clock alarm is selected.
[0021]
According to the above configuration, it is possible to realize the speaker device 1 which is
compact, but has sufficient sound of the low-pitched portion in stereo by sufficiently taking
"volume of cavity", "cross-sectional area of duct" and "length of duct". Also, when the speaker
units 20 and 21 are oriented at an angle of 70 degrees, not horizontally or directly upward, when
placed at a height of about 50 to 70 cm, such as a tabletop or bedside, The spread of the sound
can be optimized.
[0022]
In addition, since the operation panel 11 is inclined in the same direction as the speaker units 20
and 21 and at an angle of 70 degrees, the force for operating the operation surface is a force that
can be received at the bottom of the diagonally downward direction, and stable operation is
possible. The operability when the speaker device 1 is placed on the desktop or bedside is
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improved.
[0023]
FIG. 4 is a block diagram of an electric circuit of the speaker device 1.
The speaker device 1 is controlled by a control unit 50 which is a microcomputer. The control
unit 50 is mounted on the circuit board 26. The control unit 50 is connected to the display 22 for
digital watch, the switch 111, the indicator 112, and the circuit board 25, and controls them.
[0024]
An audio circuit is mounted on the circuit board 25. The circuit board 25 is provided with an FM
tuner 52, a Bluetooth (registered trademark) communication unit 53, and an analog input unit 54
as a circuit for inputting an audio signal. The analog input unit 54 includes an audio jack 43. An
audio signal input from the Bluetooth (registered trademark) communication unit 53 or the
analog input unit 53 is input to the signal processing unit 51. The signal processing unit 51
selects an audio signal in accordance with an instruction from the control unit 50, and performs
processing such as equalization on the input audio signal. The processed audio signal is input to
the amplification circuits 55 and 56. The audio signal of the left channel is input to the
amplification circuit 55, and the audio signal of the right channel is input to the amplification
circuit 56. The amplification circuits 55 and 56 input the amplified audio signals to the speaker
units 20 and 21, respectively. The speaker units 20 and 21 emit the input audio signal as sound.
[0025]
The control unit 50 controls the pairing operation of the Bluetooth communication unit 53, the
equalization operation of the signal processing unit 51, the gains of the amplifier circuits 55 and
56, and the like. The control unit 50 changes the display of the indicator 112 and the display
(digital clock) 22 and changes the setting of the audio circuit of the circuit board 25 in
accordance with the operation of the switch 111.
[0026]
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In this embodiment, the external appearance of the speaker device 1 is shaped as if a cylinder is
cut obliquely, but if the surface (upper surface) provided with the operation panel 11 and the
speaker units 20 and 21 is obliquely upward at about 70 degrees The shape of the housing may
be hexagonal, octagonal or the like, and is not limited to a circle. Further, from the viewpoint of
layout, operability and design, the shape of the operation panel 11 and the shape of the top
surface of the housing 10 (cover grille 12) should be substantially similar and concentric (share
the center point) Is desirable.
[0027]
DESCRIPTION OF SYMBOLS 1 Speaker apparatus 10 Case 11 Operation panel 15 Bass reflex
duct 20, 21 Speaker unit 25, 26 Circuit board 100 Cavity
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