JP2002064896

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DESCRIPTION JP2002064896
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
center speaker device which is installed at a center position in a vehicle and connected to an
existing in-vehicle stereo device to realize multi-channel sound reproduction.
[0002]
2. Description of the Related Art An audio device such as a component or an in-vehicle audio
device generally comprises a reproduction mechanism of an audio recording medium such as a
CD, an MD, or a magnetic tape, and broadcasts such as AM broadcasting, FM broadcasting, and
television broadcasting. A tuner mechanism for receiving is provided. In addition to these
reproduction mechanisms, recent acoustic devices have an auxiliary input mechanism and have a
function of receiving musical tone information and voice information from other appropriate
sound sources etc. and emitting them from a speaker. It is equipped.
[0003]
The tuner is generally provided with an automatic gain control circuit (AGC circuit) or the like in
order to obtain stable broadcast reception by adjusting the fading of broadcast radio waves, the
output level of each station, and the like. In the audio apparatus, the broadcast of each station is
supplied to the speaker in a state where the output level is adjusted through the tuner so that the
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sound is emitted at the volume set by the volume adjustment operation. That is, the acoustic
device causes the reproduction sound having a certain output level to be released at a volume
adjusted appropriately by performing the volume adjustment operation.
[0004]
By the way, in addition to the combination type acoustic device described above, various acoustic
devices are mounted and used as an optional device in a car. In such an optional sound device,
power is generally taken out from a cigarette lighter socket part from which a cigarette lighter is
detached. Japanese Patent Laid-Open Publication No. Hei 4-196828 "Hand-Free Device" discloses
a hand-free device for making a hands-free call with a car telephone, wherein a power supply of a
speaker is obtained from a cigarette lighter socket.
[0005]
By the way, in the case of an audio apparatus in the home, for example, with the spread of a DVD
reproducing apparatus, a home theater is as powerful as an audio system such as a theater or
movie theater. A speaker system is provided that is adapted to play back the venue. In this
speaker system, as shown in FIG. 9, the left and right two speakers RLS and RRS are installed on
the back side in addition to the left and right two speakers FLS and FRS of the normal stereo
device for the viewer M A center speaker CS is installed at the center of the side, and it is further
constituted by a so-called 5.1 channel provided with a subwoofer SW. According to such a
speaker system, for the viewer located in the central portion, the reproduction sound is emitted
from the speakers installed in the periphery, whereby a sound field full of sense of reality is
formed.
[0006]
[0006] On the other hand, since a car is forced to drive for a long time in a closed car, various
devices are equipped which can cure the feeling of tension and obtain more information and the
like. In a car, an audio device such as a broadcast receiver, a tape reproducing device, or a disk
reproducing device is mounted as a standard, and a speaker for emitting the reproduced sound is
mounted. In a car, two speakers are generally installed on the front side and two speakers are
also installed on the rear side in order to perform stereo reproduction of reproduction sound
from the sound device.
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[0007]
By the way, in a car, mounting of a DVD reproducing apparatus is also being considered along
with each of the above-mentioned audio apparatuses. That is, although a navigation apparatus
has recently been mounted on a car, the navigation apparatus is not limited to a mere route
guide function, and various functions such as a video CD and a music CD reproduction function
can be improved. In the navigation apparatus, conventionally, version upgrade information and
the like are input by a CD-ROM, but it is considered to use a DVD that enables large-capacity
recording of image information and the like.
[0008]
Therefore, in a car, reproduction of a DVD can also be performed by using such a navigation
device, and the in-vehicle environment can be further improved. Of course, in a car, a DVD player
independent of the navigation device may be mounted. In automobiles, with the above-described
DVD playback function and CD playback function, there is a demand for the above-mentioned
speaker system of the 5.1 channel configuration that can provide more powerful playback sound
as compared to the conventional stereo playback speaker system. Is large.
[0009]
Although the 5.1 channel speaker system can use the four front and back speakers
conventionally installed in a car as FLS, FRS and RLS, RRS, the inside of a limited car space can be
used. It is a big problem to install the center speaker optimally. Although the subwoofer is not
normally installed in the car, there is no strict restriction in the installation position as other
speakers are exclusively for reproducing the bass region, and the correspondence can be easily
achieved, and it can be used for in-vehicle use. Are also provided and readily available.
[0010]
In the 5.1 channel speaker system, it is necessary to install the center speaker in the center of the
front side of the vehicle. Although there are some commercially available on-vehicle center
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speakers, they are not general-purpose speakers, and there are few such types. Moreover, in the
automobile, a console box equipped with various instruments, the operation unit of the air
conditioner, or various audio devices, etc. has already been arranged at the center site, and in
addition to the monitor of the navigation system or the DVD player It is extremely difficult to
install a speaker as an option.
[0011]
Although a commercially available on-vehicle center speaker is conventionally installed on a
dashboard in many cases, there is a problem that the appearance of the vehicle is deteriorated
because the wiring with an acoustic device etc. is exposed. The on-vehicle center speaker further
requires a driving amplifier, but it is difficult to secure the installation place, and there is also a
problem that the power supply wiring supplied thereto is also bothersome and the appearance is
deteriorated. Therefore, conventionally, the installation of the on-vehicle center speaker has been
limited to only some manias. In other words, the on-vehicle 5.1 channel speaker system requires
a fundamental response of the vehicle such as redesigning of a conventional on-vehicle device or
a dashboard for the realization.
[0012]
By the way, in a retrofit vehicle-mounted device, the power supply is generally obtained from a
cigarette lighter socket portion provided in a console box, and the hand-free device described in
the prior patent publication mentioned above is also a drive power supply for the speaker. Is
obtained from the cigarette lighter socket. The hand-free device described in the prior application
publication is independent of a speaker system such as an acoustic device already installed, and
does not constitute a new speaker system which has not been conventionally mounted on a car.
[0013]
Therefore, the present invention can be connected to an on-vehicle acoustic device without
needing complicated wiring, and can be easily installed at an optimum position in a limited invehicle space to enable multi-channel acoustic reproduction with existing speakers. It has been
proposed for the purpose of providing a center speaker device for an on-vehicle stereo device.
[0014]
According to the present invention, there is provided a center speaker device for an on-vehicle
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stereo device according to the present invention, which comprises: a receiver for receiving a
center output signal wirelessly supplied from the on-vehicle stereo audio device; Power is
supplied from an on-vehicle battery by being attached to an amplifier for converting and
amplifying the received center output signal, a speaker for emitting a reproduced sound of the
center output signal, and a cigarette lighter socket disposed in the console box. And a power
supply unit for supplying driving power to the receiving unit and the amplifier.
[0015]
According to the center speaker device for in-vehicle stereo device of the present invention
configured as described above, the multi-speaker is installed along with the front and rear
speakers such as the existing in-vehicle stereo sound device installed in the approximate center
of the vehicle interior. Configure the system
According to the in-vehicle stereo device center speaker device, the wireless connection with the
in-vehicle stereo audio device enables installation in the vehicle without the need for troublesome
wiring processing, and particularly troublesome power processing makes the cigarette lighter
socket part By using it, the correspondence can be simplified.
According to the in-vehicle stereo device center speaker device, it is installed in the central
portion in the vehicle by directly attaching it to the cigarette lighter socket portion of the console
box or attaching it using a rearview mirror.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present
invention will be described in detail with reference to the drawings. The center speaker device 1
is installed in a cigarette lighter socket 4 provided in a console box 3 of a car 2 as shown in FIGS.
1 and 2 and constitutes a 5.1 channel speaker system in the car together with an existing
speaker system. . Although the details are omitted in the car 2, the console box 3 is installed at
the front center of the car, with the driver's seat and the passenger's seat being divided. The
console box 3 is provided with an operation part of the air conditioner and an air outlet.
Alternatively, a combination sound device or the like for receiving radio broadcasting or the like,
playing a tape, playing a disc or the like is incorporated.
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[0017]
In the car 2, for reproduction output of combination sound equipment, for example, one front
speaker 5, 6 is installed on the inner side of the left and right front doors or both sides of the
dashboard, and The left and right rear speakers 7 and 8 are provided respectively. For example,
not only the above-described devices but also a television receiver, a navigation device, various
image reproducing devices, and the like are mounted in the high-grade automobile 2, and these
device bodies are also incorporated in the console box 3. The console box 3 further incorporates
a common monitor 9 for appropriately switching and displaying a television broadcast reception
image, navigation information, reproduction image, etc. transmitted from each of these devices.
When the television receiver, the navigation device, the image reproduction device, etc. are
installed as an optional device after installation in the car, generally the device body is installed
in the foot space area of the passenger seat and the monitor is on the dashboard. Installed in
[0018]
In the car 2, as described above, studies are being made to incorporate a DVD reproduction
mechanism into the navigation device and to mount a DVD reproduction device as an image
reproduction device. In the car 2, by installing the center speaker device 1 in addition to the
conventional stereo reproduction speaker system for reproduction of these devices, the abovementioned DVD output etc. can be obtained as dynamic reproduction sound more realistic A
channel speaker system is configured. In the speaker system, the center speaker device 1
reproduces and reproduces a medium sound band of 5 kHz to 150 kHz. Although the speaker
system is not shown, a subwoofer is installed at an appropriate position in the vehicle.
[0019]
The center speaker device 1 is preferably installed at the center on the front side in the vehicle to
fully exhibit its function, and as shown in FIG. 2, a cigar writer from which a cigar lighter
provided in the console box 3 is detached By utilizing the socket portion 4 cleverly, it can be
suitably installed and its driving power source can be secured. The center speaker device 1 is
removed from the cigar writer socket portion 4, for example, when the reproduction sound from
the main body device 10 is not output by the 5.1 channel speaker system. The center speaker
device 1 is inserted and removed in the same manner as when the cigarette lighter and the
cigarette lighter socket 4 are inserted and removed.
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[0020]
The center speaker device 1 will be described in detail later, but as shown in FIG. 5, a center
reproduction signal such as an acoustic signal or an audio signal is supplied from the main unit
10 by radio such as infrared rays or weak radio waves. The reproduction sound based on the
reproduction signal is emitted from the built-in speaker 11. As shown in FIG. 3, the center
speaker device 1 includes a speaker housing 12 whose front surface 12 a is a sound emitting
surface of the built-in speaker 11, and the connection plug 13 integrally protrudes on the back
surface 12 b. In the center speaker device 1, an infrared signal receiving unit 14 is provided on
the side surface 12 c of the speaker housing 12. The center speaker device 1 can be operated
even when installed in the console box 3 via the cigar writer socket 4 because the speaker
housing 12 is small so that the size of the front surface 12a is about 10 cm square. There is no
risk of problems.
[0021]
The connection plug 13 has the same structure as that of the plug portion of the cigarette lighter,
and therefore the details thereof will be omitted. However, the insulating cylindrical portion 13a
cantilevered on the back surface 12b of the speaker housing 12 and the insulating cylindrical
portion 13a A first electrode 13b exposed at the tip of the tip, and a second electrode 13c made
of a metal elastic piece provided inside the insulating cylindrical portion 13a with a contact
portion exposed at the outer peripheral portion. The connection plug 13 has an outer diameter of
the insulating cylindrical portion 13a slightly smaller than the socket hole of the cigarette lighter
socket portion 4, and is inserted into the socket hole while elastically displacing the second
electrode 13c inward.
[0022]
In the state where the connection plug 13 is inserted to a predetermined position of the cigarette
lighter socket portion 4, the second electrode 13c elastically returns to the initial state, and is
engaged with the electrode portion formed on the inner peripheral wall of the socket hole.
Electrically connected and mechanically held. The connection plug 13 is electrically connected by
contacting the first electrode 13 b with the electrode portion provided at the bottom of the
socket hole. The connection plug 13 is thereby supplied with power from a battery mounted on
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the automobile 2 and constitutes a power supply unit for supplying power to each part.
[0023]
The center speaker device 1 may be configured as a separate type in which the power supply
terminal portion 16 is connected to the main body portion 15 by the power supply cord 17 as
shown in FIG. . The separate type center speaker device 1 has the main body 15 installed at an
appropriate position in the approximate center of the vehicle, and the connection plug 13 of the
power supply terminal 16 is inserted into the socket hole of the cigarette lighter socket 4 as
described above. Be The separate type center speaker device 1 thereby allows the connection
plug 13 to be held by the cigarette lighter socket 4 and to receive power supply from the battery.
[0024]
The center speaker device 1 may be provided with an appropriate clamper member 18 in the
speaker housing 12 though the details are omitted. As shown in FIG. 5, in the center speaker
device 1, the main body portion 15 is positioned on the back surface of the rearview mirror 19,
and is attached via the clamper member 18. The center speaker device 1 is attached to the
rearview mirror 19 and disposed at the center on the front side in the vehicle, so that the
function is sufficiently exhibited. Depending on how the power cord 17 is pulled, the center
speaker device 1 sometimes cuts the windshield longitudinally as shown in the same figure, but
installing the main body 15 on the back of the rearview mirror 19 hinders operation. There is
nothing to do. The center speaker device 1 may avoid the vertical section of the windshield by,
for example, drawing a power cord 17 to the side using a sun visor or the like.
[0025]
As shown in FIG. 6, the center speaker device 1 together with the above-described built-in
speaker 11 needs power for the infrared signal receiver 14, the decoder 20, the volume
controller 21, the power amplifier 22, and each part. A power supply circuit 23 or the like for
supplying the signal is incorporated in the speaker housing 12. The center speaker device 1
receives the reproduction sound of the infrared signal transmitted from the infrared transmission
unit 24 of the main device 10 by the infrared signal reception unit 21. In the center speaker
device 1, the infrared signal is decoded into an acoustic signal or the like in the decoder 20 and
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supplied to the volume controller 21 together with the volume control signal. In the center
speaker device 1, an acoustic signal or the like whose volume is adjusted in the volume controller
21 based on the volume control signal is supplied to the power amplifier 22 and emitted from
the built-in speaker 11 at a predetermined volume.
[0026]
As described above, the center output signal is transmitted from the infrared ray transmitting
unit 24 of the main unit 10 to the center speaker unit 1. In the main unit 10, for example, as
shown in FIG. 7, when the DVD reproduction unit 25 reproduces the DVD, the reproduction
acoustic signal etc. is supplied to the digital 5.1 channel decoder 26, and the left and right front
output signals Decode into the rear output signal and the subwoofer output signal and the center
output signal.
[0027]
In the main unit 10, the front output signal, the rear output signal and the subwoofer output
signal are output to the existing left and right front speakers 5, 6 installed in the car, and the left
and right rear speakers 7, 8 and the subwoofer And emit noise. In the main unit 10, the center
output signal is supplied to the encoder 27 and encoded into an infrared output signal, and then
transmitted from the infrared transmitting unit 24 to the center speaker unit 1.
[0028]
The center speaker device 1 is directly attached to the cigarette lighter socket 4 provided in the
console box 3 as described above, or attached to the back mirror 19. Therefore, the center
speaker device 1 is installed in close proximity to the main device 10 incorporated in the console
box 3, and there is no shielding between them, so the center speaker device 1 is transmitted from
the infrared ray transmitting unit 24 of the main device 10. The infrared output signal is reliably
received by the infrared signal receiver 14.
[0029]
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In the embodiment described above, the center speaker device 1 and the main unit 10 are
wirelessly connected by infrared rays, but of course they may be connected by radio waves. In
the radio wave connection system, a radio wave reception unit including an antenna is provided
instead of the infrared signal reception unit 14 on the center speaker device 1 side, and a radio
wave transmission unit including an antenna instead of the infrared transmission unit 24 on the
main apparatus 10 side. Provided. The center speaker device 1 and the main body device 10 are
disposed close to each other, so that a simple and inexpensive connection using weak radio
waves is performed.
[0030]
The center speaker device 1 and the main body device 10 are disposed so that the infrared signal
receiving unit 14 and the infrared transmitting unit 24 face each other in the case of the abovedescribed wireless connection by the infrared, because of the straight-ahead characteristics of
the infrared. There is a need to. In the case where the center speaker device 1 and the main body
device 10 are wirelessly connected by the weak radio waves described above, it is not necessary
to arrange the radio wave receiving unit and the radio wave transmitting unit particularly facing
each other.
[0031]
In the embodiment described above, the reproduction sound etc. whose volume is adjusted by the
volume controller 21 based on the volume control signal of the center reproduction signal
supplied from the main unit 10 is emitted from the built-in speaker 11. Although configured, as
shown in FIG. 8, a center reproduction signal whose volume is adjusted in advance may be
supplied from the main body device 10 to the center speaker device 1. The main unit 10 is
provided with a volume controller 28 for adjusting the volume of the center reproduction signal
output from the digital 5.1 channel decoder 26.
[0032]
Therefore, the main unit 10 supplies a center reproduction signal, which has been subjected to
volume adjustment in advance, from the infrared transmission unit 24 to the center speaker unit
1. The center speaker device 1 dispenses with the volume controller 21 as shown in the figure,
and emits a reproduction sound based on the center reproduction signal from the built-in
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speaker 11 with a predetermined volume.
[0033]
As described above in detail, according to the center speaker device for in-vehicle stereo device
according to the present invention, it is possible to simply install in a substantially central portion
in the vehicle without the need for troublesome wiring processing. A possible and necessary
power source is also obtained from the cigarette lighter socket, and an acoustic signal is emitted
from the built-in speaker based on the center reproduction sound wirelessly supplied from the
on-vehicle stereo sound device. Therefore, the in-vehicle stereo device center speaker device
constitutes a multi-speaker system together with the front and back speakers of the existing invehicle stereo sound device, and faithfully reproduces the reproduction sound supplied from the
multi-channel in-vehicle stereo sound device in the vehicle. Make it possible to emit noise.
[0034]
Brief description of the drawings
[0035]
1 is an explanatory view of a car in which a multi-speaker system is configured by mounting the
center speaker device according to the present invention.
[0036]
2 is an explanatory view of a console box to which the center speaker device is mounted.
[0037]
3 is a perspective view of the same body type center speaker device.
[0038]
4 is a perspective view of a separator type center speaker device shown as another embodiment.
[0039]
5 is an explanatory view of a state in which the main body is attached to the back of the rearview
mirror as an example of installation of the separator type center speaker device.
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[0040]
6 is a block diagram for explaining the configuration of the center speaker device.
[0041]
7 is a block diagram for explaining the output section of the digital 5.1 channel.
[0042]
<Figure 8> It is the block diagram which explains the radio wave connection type center speaker
device and the main body unit which show as other form of execution.
[0043]
9 is an explanatory view of a digital 5.1 channel speaker system.
[0044]
Explanation of sign
[0045]
REFERENCE SIGNS LIST 1 center speaker device 2 car 3 console box 4 cigarette lighter socket 5
front speaker 6 front speaker 7 rear speaker 8 rear speaker 9 monitor 10 main unit 11 built-in
speaker 12 speaker housing 13 Connection plug, 14 infrared signal receiver, 15 main unit, 16
power terminal, 17 power cord, 19 back mirror, 20 decoder, 21 volume controller, 22 power
amplifier, 23 power circuit, 24 infrared transmitter
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