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JPH04220898

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH04220898
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a
housing and a loudspeaker incorporated in the housing, wherein the housing has an acoustic
opening with one end formed in an opening formed in the side of the housing. A channel is
provided to acoustically couple the loudspeaker acoustically to the channel, and the diaphragm
of the loudspeaker forms part of the wall of the acoustic channel, the acoustic channel being the
side An audio or video device having a gradually increasing longitudinal cross-section as viewed
in the direction of the aperture of
[0002]
BACKGROUND OF THE INVENTION A device of this kind is described in GB 735,402. In this
specification, an example applied to a television set is described. However, applications of audio
such as car audio are also conceivable. Car audio housings generally contain all of the electronic
components necessary for this application. The above-mentioned aspect is the front of the car
audio that can be viewed and manipulated when the car audio is installed in the appropriate
opening of the instrument panel of the car.
[0003]
In all cases, efforts should be made to make the components in the housing extremely small, to
make the device as small as possible, and to provide the best possible sound reproduction. .
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[0004]
It is therefore an object of the present invention to obtain an audio or video device which is as
small as possible, performs the best audio reproduction, and is as cost effective as possible.
[0005]
SUMMARY OF THE INVENTION In order to achieve the above object, an audio or video device
according to the invention is characterized in that the length of the loudspeaker as viewed in the
longitudinal direction of the acoustic channel is equal to the length of the acoustic channel. With
the loudspeaker being disposed in the channel and having a dimension which is part of the
loudspeaker's diaphragm and is greater than or equal to one-half of the surface area of the
diaphragm; The line orthogonal to this part is not directed to the opening of the housing when
reflecting off the channel surface, and the channel is shaped so that the orthogonal line makes
equal incident and reflection angles with respect to the channel surface It features.
[0006]
The present invention is based on the concept that relatively large loudspeakers can be
integrated into an audio or video device and still try to keep the housing of the device compact.
This can be achieved by the loudspeaker diaphragm making up a large part of the wall of the
acoustic channel.
[0007]
This measure is known per se and is described, for example, in US Pat. No. 2,440,078.
However, in the case of the loudspeaker of this patent, the line orthogonal to the surface of the
diaphragm, once reflected on the channel surface, places the loudspeaker in the channel and
forms a channel at an angle that points to the aperture.
In this way, acoustic channels are only used inefficiently from an acoustic point of view.
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[0008]
According to the invention, the horn effect of the acoustic channel is optimally used by thus
installing the loudspeakers and selecting the shape of the channels so that they do not point to
the apertures after reflection. be able to. Thus, audio reproduction is improved. Furthermore,
standard cone loudspeakers can be used over the frequency band.
[0009]
According to the invention it is possible, for example, to install relatively large loudspeakers in
car audio. According to the DIN standard, the dimensions of the car audio are 50 mm high, 180
mm wide, and 149 mm deep. The front side is not provided with apertures to accommodate
relatively large loudspeakers capable of reproducing low frequency signals of sufficiently high
level. The promotion of miniaturization of the car audio electronics results in a cavity in the
housing for housing a relatively large loudspeaker. This can be achieved by arranging the
loudspeaker horizontally in the housing (tilted). Through the acoustic channels and the openings
on the front side, the acoustic signals generated by the loudspeakers can reach the cabin of the
motor vehicle. Furthermore, since car audio can be installed in the instrument panel of a motor
vehicle, this instrument panel can function as a preferred acoustic baffle for low frequency sound
reproduction.
[0010]
According to the invention, as far as, for example, a low-cost area car audio is concerned, which
only reproduces monophonic signals, a broadband loudspeaker in the housing is sufficient. This
means that the vehicle itself does not need to be extra wired to connect to one or more
loudspeakers / loudspeaker enclosures.
[0011]
According to the invention, the loudspeakers mounted in the housing can be woofers for stereo
signal reproduction. In this case, the car audio system is provided with terminals for supplying
respective electrical signals to at least two squawkers mounted on a stereo device anywhere in
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the car cabin.
[0012]
The acoustic channel is preferably in the form of an acoustic horn. The acoustic horn provides
adequate transmission between the mechanical vibration of the diaphragm of the loudspeaker
and the acoustic signal supplied by the car audio, and is particularly suitable for reproducing
high frequency audio signals from the loudspeaker. is there.
[0013]
Furthermore, the car audio built into the housing is configured for the reproduction of low
frequency audio signals, and further, second and third loudspeakers for reproducing higher
frequency portions of the left and right signals of the stereo signal. And mechanically couple the
second and third loudspeakers to the side of the housing. In this way, stereo car audio and stereo
reproduction do not require loudspeakers at any point in the car cabin to reproduce the left and
right information of the stereo signal respectively, and they are separate in the car cabin. It can
do without providing wiring.
[0014]
In particular, when the second and third loudspeakers are respectively connected to the side of
the housing by means of a support and made adjustable with respect to the housing, excellent
stereo reproduction is realized in this type of car audio. be able to.
[0015]
Preferred embodiments of the invention will now be described with reference to the drawings.
[0016]
FIG. 1 shows a front view of a car radio according to the invention.
A plurality of control members are provided on the front of the car radio.
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For example, a volume control knob 1, a tuning knob 2 for station tuning, and a push button 3
for selecting a frequency range such as, for example, FM, MW, LW or USW. In the front of the car
radio, a hole 4 is further provided at the rear of the grille 5. However, the grille 5 is not always
necessary. The apertures 4 are rectangular in shape and have a width to height ratio of, for
example, 3: 1.
[0017]
When the width of the aperture 4 substantially corresponds to the diameter of a loudspeaker
(hereinafter abbreviated as "speaker") 6 incorporated in a car radio as shown in FIG.
Approximately equal to 1/3 of the diameter of. However, the height of the aperture 4 can also be
smaller than 1/3 of the diameter of the speaker 6.
[0018]
FIG. 2 shows a longitudinal cross-sectional view of the car radio on the line A-A of FIG. 1 when
installed in the instrument panel 10 of a car. FIG. 2 shows the speaker 6 housed in the housing 7
of the car radio. The speaker is an electrodynamic type cone speaker. These speakers are known
per se and will not be described further. The speaker 6 acoustically cooperates with the channel
8 housed in the car radio housing. One end of the channel is opened in a hole 4 in the front of
the car radio. The mechanical vibration of the diaphragm 9 of the converter 6 is converted into
an acoustic wave that reaches the cabin through the channel 8 and the aperture 4. The speaker 6
is installed on the wall of the acoustic channel 8. The width of the channel 8 is identical over the
entire length of the channel, for example equal to the width b of the opening 4 in the front of the
car radio.
[0019]
The housing is provided with a shaping portion 11 ', which gives the channel a gradually
increasing cross-sectional shape in the direction of the aperture 4. Viewed in the longitudinal
direction of the channel 8, the speakers 6 are sized to be greater than or equal to half the length
of the channel 8. Preferably, the dimension of the surface of the diaphragm is at least 1⁄4 of the
surface of the channel 8.
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[0020]
The channel 8 and the cavity 9 'behind the loudspeaker 6 are acoustically separated in order to
prevent acoustic shorts. Preferably, the rear housing wall of the loudspeaker is provided with
apertures so that the low frequency sound reproduction of the loudspeaker is not impeded by the
cavity 9 '. The electronics of the car radio are arranged in the cavity 9 '.
[0021]
In order to ensure that the acoustic channels do not adversely affect the transmission of acoustic
signals from the loudspeakers to the cabin, it is preferable for the channels to be shaped so as to
gradually increase in cross section in the direction of the apertures. is there. This can be achieved
by further increasing the width and / or height of the channel 8 towards the aperture 4. This is
illustrated in FIG. 3, which is similar to the cross-section on line AA of FIG. In this case, the width
of the channel 8 is constant and the height h increases.
[0022]
In this case, the speaker 6 'is a flat diaphragm speaker, and is mounted on the housing 7 at a
slight inclination from the configuration of FIG.
[0023]
Flat diaphragm speakers are known per se and will not be described further.
The loudspeaker 6 'is housed in the wall of the channel 8'.
[0024]
FIG. 4 shows a cross section of still another embodiment. In this case, the speaker 6 is installed
further inclined on the front of the car radio. However, the degree of this inclination is not
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important. The channel 8 '' is in the shape of a conventional flared horn. The width of the
channel 8 '' is a constant value, for example a value equal to b in FIG. The height h 'is gradually
increased in the direction of the aperture 4 to make the shape of the channel 8' 'in the plane of
the drawing into the shape of a flared horn. This can be realized by introducing the molded body
11 of the required shape to the top surface of the housing 7.
[0025]
In the embodiment of FIG. 2, a channel somewhat horn-shaped is realized by introducing
moldings 11 'into the top surface of the housing 7 exactly above the converter 6 in the channel
8.
[0026]
Still another embodiment is shown in FIG.
[0027]
Although no loudspeaker is shown in FIG. 5, the loudspeaker radiates downwards towards the
acoustic channel which opens in the aperture 4 '.
FIG. 5 shows a cassette insertion hole 20 for inserting a cassette tape.
The end 4 'of the channel 8' 'is closed by the grill 5'. In this case, a speaker (not shown) is, for
example, a woofer that reproduces only low frequency audio signals. The audio signal is
considered to be composed of the sum of the left and right signal parts of the stereo signal
located in a frequency range which also reaches about 300 Hz. For stereo signal reproduction,
the car radio is provided with a second speaker 23 and a third speaker 24 respectively. The
speaker 23 is intended to reproduce the left signal part of the stereo signal. スピーカー23はツ
イーターまたはスコーカーとする。 The speaker 24 is also a tweeter or squawker intended to
reproduce the right signal part of the stereo signal. The speakers 23, 24 are mechanically
coupled to the front of the car radio. The mechanical connection should be able to be removed as
required. FIG. 5 shows an embodiment in which two speakers are connected to the front of a car
radio by means of supports 25, 26, respectively. The speakers are adjustable relative to the car
radio. In this case, the speaker may be rotatably connected to the supports 25 and 26 by the
connection means, or the support may be rotatably connected to the front of the car radio by the
connection means, or both of them. it can. Thus, the speakers can be positioned in a direction
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that allows optimal stereo reproduction for the passengers in the vehicle compartment. The feed
wires to the speakers 23, 24 are passed through the supports 25, 26.
[0028]
The advantage of this type of car radio is that no external wiring to the speakers is required
anywhere in the cabin of the motor vehicle and installation is extremely simple. The car radio
together with the loudspeaker can be inserted at a time into the appropriate opening of the
automotive instrument panel and can be used immediately. It goes without saying that the
speakers 23, 24 should not have sharp projecting parts in terms of safety. The instrument panel
of the car acts as a baffle for the acoustic signal generated from the loudspeaker 6.
[0029]
FIG. 6 shows an embodiment applied to a television set. FIG. 6 is a cross-sectional view of the
speaker and acoustic channel showing only a portion of the housing 60 and picture tube 61 of
the television set. The speaker 62 has a diameter as large as the length of the channel 63. A grill
64 is placed in front of the sound outlet of the channel 63. In this embodiment, the channel 63 is
formed by the speaker itself, and the details of the shaping portion 65 are shown in FIG. 7. FIG. 7
(b) shows the shaping portion on line bb of FIG. 7 (a). FIG. 7A is a plan view of a shaping portion.
[0030]
Brief description of the drawings
[0031]
1 is a front view of an audio device of a car radio type embodiment according to the present
invention.
[0032]
2 is a cross-sectional view of a car radio of the first embodiment according to the present
invention.
[0033]
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3 is a cross-sectional view of a car radio of the second embodiment according to the present
invention.
[0034]
4 is a cross-sectional view of a car radio of the third embodiment according to the present
invention.
[0035]
5 is a cross-sectional view of a car radio of the fourth embodiment according to the present
invention.
[0036]
6 is a partial sectional view of an embodiment of the form of a television set according to the
invention.
[0037]
7A is a plan view of the shaping portion of the speaker of the embodiment of FIG. 6, and FIG. 7B
is a cross-sectional view of the shaping portion of the speaker of the embodiment of FIG.
[0038]
Explanation of sign
[0039]
Reference Signs List 1 volume control knob 2 tuning knob 3 push button 4 aperture 5, 5 ', 64
grille 6, 6', 62 loudspeaker 7, 60 housing 8, 8 ', 8' ', 63 channel 9 diaphragm 9' cavity 10
instrument Panel 11 molded body 11 ', 65 shaping portion 20 cassette insertion aperture 23
second speaker 24 third speaker 25, 26 support 61 image tube
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