JP2004363900

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DESCRIPTION JP2004363900
An object of the present invention is to prevent vibration generated in a speaker at the time of
sound reproduction from being transmitted to a speaker cable fixing surface. A speaker device
includes a speaker body, a cable of an input signal, and a cable connection portion for connecting
the cable to the speaker body, the cable connection portion being a vibration that absorbs the
vibration of the speaker body. It has an absorption part. Normally, when an audio signal is
reproduced by the speaker, the vibration of the speaker body is transmitted to the cable
connection portion between the cable and the speaker body, which is transmitted to the cable. By
providing the vibration absorbing portion at the portion connecting the cable and the speaker
body, it is possible to prevent the vibration of the speaker body from being transmitted to the
cable and further from transmitting to the object fixing the cable. For example, in the case of an
in-vehicle speaker, the cable is fixed to a door inner panel of a vehicle, etc. However, the vibration
of the speaker body is not transmitted to the door inner panel by providing the vibration
absorbing portion, so the door inner panel vibrates. It is possible to prevent the generation of
abnormal noise. [Selected figure] Figure 4
Speaker device
TECHNICAL FIELD [0001] The present invention relates to a speaker device. [0002] A vehiclemounted speaker is referred to as an inner panel (hereinafter referred to as a "door inner panel")
inside a door of a driver's seat, a front passenger seat or left and right rear seats. It is attached to
be embedded in etc.). Then, in order to supply an audio signal and power from the audio
amplifier side to the speaker, the speaker cable drawn from the audio amplifier side is fixed to
the door inner panel surface via a fixing member such as a hook, and the cable is mounted on the
vehicle It is designed to lead to the vicinity of the speaker body. [0003] A speaker cable may be a
speaker dedicated cable or a speaker cable branched from a bundle of cables (referred to as a
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wire harness) having a plurality of uses, and both of the speaker cables A male or female
connector is provided at the tip. Then, by connecting the connector to a connector provided in
the speaker frame, supply of signals and power to the vehicle-mounted speaker is performed. The
on-vehicle speaker vibrates the diaphragm to emit sound waves into the vehicle when the signal
and power are supplied from the audio amplifier side. [0004] As a known technique related to a
speaker, a device in which a conductive portion of a conductive damper is prevented from
shorting to a frame (see, for example, Patent Document 1), a terminal of a coil wire wound on a
voice coil bobbin of a speaker To reduce the number of wiring steps for electrically connecting
the coil wire and the speaker terminal at the time of assembling the speaker by making the U
shape, a loop shape, etc. (see, for example, Patent Document 2) It is known that when attaching a
magnetic circuit module to a vibration system module, an adhesive or the like is applied to the
outer peripheral portion of a plate to prevent an abnormal sound from being generated from a
speaker (see, for example, Patent Document 3). ing. Patent Document 1: JP-A-2002-78080 Patent
Document 2: JP-A-2000-312397 Patent Document 3: JP-A-2001-333498 Problem to be Solved
by the Invention When the sound is reproduced through the speaker, the diaphragm vibrates in
the axial direction of the speaker, and the speaker frame also vibrates in the axial direction of the
speaker by the reaction. At this time, the speaker frame also vibrates in the lateral direction
orthogonal to the axial direction of the speaker. The vibration of the speaker frame is transmitted
to the connector attached to the speaker frame, transmitted from the connector to the cable for
the speaker, and further through the fixing member such as the hook for fixing the cable for the
speaker to the door inner panel It is transmitted to.
As a result, the cable mounting surface in the car, such as the door inner panel, vibrates, and
there is a problem that a sound wave (abnormal sound) is radiated into the car. In particular, in
the case where the cable attachment surface is an iron plate portion, such a sound wave is likely
to cause noise because it is easily vibrated and the resonance frequency (Q) is also high. This
sound wave contains many distortion components because it is emitted as a sound wave by
vibrating the door inner panel etc. Also, since it is emitted into the car behind the sound wave
emitted from the diaphragm in time, it vibrates. It is a deterioration from the sound quality
radiated from the board. Also, in general, when the connector on the speaker frame side and the
connector on the audio amplifier side are connected, the terminal fittings often do not have a
structure in which the entire surface is completely in contact with each other. . Therefore, when
the connector vibrates due to the vibration of the speaker frame, the contact portions of the
terminal fittings can not be vibrated integrally, and are rubbed and worn, which may cause
conduction failure and the like due to aging. . As problems to be solved by the present invention,
the above-mentioned ones can be mentioned as an example. An object of the present invention is
to prevent vibration generated in a speaker at the time of reproduction of sound from being
transmitted to a speaker cable mounting surface in a car. [0010] The invention according to
claim 1 comprises a speaker body, a cable for an input signal, and a cable connection portion for
connecting the cable to the speaker body, the cable The connection unit includes a vibration
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absorbing unit that absorbs the vibration of the speaker body. In one aspect of the present
invention, a speaker device comprises a speaker body, a cable for an input signal, and a cable
connection portion for connecting the cable to the speaker body. The cable connection portion
includes a vibration absorbing portion that absorbs the vibration of the speaker body. Usually,
when an audio signal is reproduced by the speaker, the vibration of the speaker body is
transmitted to the cable connection portion between the cable and the speaker body, which is
transmitted to the cable. In the above speaker device, since the vibration absorbing portion is
provided at the portion connecting the cable and the speaker main body, it is possible to prevent
the vibration of the speaker main body from being transmitted to the cable and further
transmitting it to the target fixing the cable. For example, in the case of an in-vehicle speaker, the
cable is fixed to a door inner panel of a vehicle, etc. However, the vibration of the speaker body is
not transmitted to the door inner panel by providing the vibration absorbing portion, so the door
inner panel vibrates. It is possible to prevent the generation of abnormal noise.
In one aspect of the above speaker device, the vibration absorbing portion may be a curved
portion provided on the cable in the vicinity of the cable connection portion. In this aspect, the
vibration of the speaker main body can be absorbed by providing the cable with, for example, a
U-shaped shape or one or more winding shapes in the vicinity of the connection portion with the
speaker main body. In another aspect of the above speaker device, the speaker device further
includes a plurality of fixing members for fixing the cable to an object to which the speaker main
body is attached, and the curved shape portion is connected to the cable among the plurality of
fixing members. It is provided between the fixing member provided closest to the part and the
cable connection part. According to this aspect, when the cable is fixed to the object by a fixing
member such as a hook, for example, the vibration is absorbed at the portion closest to the
speaker, so that the cable of the portion fixed to the object vibrates. It can prevent. [0015] In
another aspect of the above speaker device, the cable connection portion may be fixed to the first
connector member connected to the cable and the speaker main body, and may be connected to
the first connector member. The vibration absorbing portion may be a vibration absorbing
material disposed between the speaker body and the second connector member. According to
this aspect, since the vibration absorbing material absorbs the vibration of the speaker body and
does not transmit it to the cable, it is possible to prevent the vibration of the cable. Moreover,
when connecting a cable to a speaker main body via a connector, since the vibration of a speaker
main body is not transmitted also to a connector, abrasion etc. of the terminal metal fittings
inside a connector can be prevented. The preferred embodiments of the present invention will be
described below with reference to the drawings. According to the present invention, when sound
is reproduced through a speaker attached to a door or the like of a vehicle, the vibration
transmitted to the speaker cable from the speaker body is absorbed or cut off, and the mounting
surface of the speaker cable to the vehicle The generation of the abnormal sound due to the
vibration of the door inner panel of the vehicle (in this example) is prevented. First, the structure
of the speaker device is shown in FIG. As shown in FIG. 1, the speaker device 10 is a magnetic
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circuit comprising a frame 2, a diaphragm 3, a damper 4, a voice coil bobbin 5 and a vibration
system such as a voice coil 6, a pole piece 7, a plate 8 and a magnet 9 etc. A system and a
connector 1 for receiving signal and / or power supply from an audio amplifier side not shown.
In the following description, a connector in which a pair of connectors are connected is referred
to as a "connector", and a male or female connector is referred to as a "connector member".
Moreover, since each component of the speaker apparatus 10 is known, detailed description is
abbreviate ¦ omitted. In the speaker device 10, when a voice current flows through the voice coil
6 in a uniform magnetic field, an electromagnetic force in the direction of arrow s1 is generated
in the voice coil bobbin 5 by the principle of electromagnetic action, and the voice coil bobbin 5
is in the direction of the arrow s1. Vibrate. Then, the vibration is transmitted to the diaphragm 3,
and the speaker device 10 emits a sound wave. At this time, in the speaker device 10, the
vibration generated from the diaphragm 3 is transmitted to the frame 2, and the main body of
the speaker device 10 exhibits vibration not only in the arrow s2 direction in the drawing but
also in the arrow s3 direction. Here, the arrow s3 indicates the left and right direction toward the
paper for convenience of the paper, but the arrow s3 is actually generated in the entire
circumferential direction of the frame 2. FIG. 2 shows the speaker device 10 attached to the door
20 of the vehicle. Fig.2 (a) is a perspective view which shows the state which attached the
speaker apparatus 10 to the door inner panel 20a. FIG.2 (b) is the side view seen from the arrow
A direction of the door 20 shown to Fig.2 (a). 2 (b) shows a state in which the door lining 20b is
attached to the door inner panel 20a for convenience of explanation, so the configuration of the
door 20 in FIG. 2 (a) is slightly different. As shown in FIG. 2A, the speaker device 10 is attached
to the door inner panel 20a via a plurality of attachment parts 10a. The speaker device 10 is
attached to the door inner panel by, for example, a screw or an adhesive. In addition, a cable 22
drawn around an audio amplifier (not shown) through a predetermined path is attached to the
door inner panel 20 a through a plurality of fixing members 21. The cable 22 is a dedicated
speaker cable or a speaker cable branched from a wire harness. The fixing member 21 is, for
example, a resin hook or the like that holds and fixes a cable. The tip of the cable 22 is connected
to the male connector member 1a. The connector member 1a is inserted into the female
connector member 1b provided on the frame 2 of the speaker device 10, and each terminal
fitting is electrically connected. Thus, the audio amplifier and the speaker device 10 are
electrically connected, and the sound can be reproduced through the speaker device 10.
When sound is reproduced through the speaker device 10, as shown in FIG. 1, an audio current
flows through the voice coil 6, the voice coil bobbin 5 vibrates in the direction of the arrow s1,
and the diaphragm 3 vibrates. Further, the frame 2 vibrates due to the reaction of the vibration
of the diaphragm 3, and the vibration of the frame 2 is transmitted from the connector members
1 a and 1 b to the cable 22 and the fixing member 21. And the vibration transmitted to the cable
22 and the fixing member 21 is further transmitted to the door inner panel 20a and the door
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lining 20b as shown in FIG. 2 (a) or (b). Next, FIG. 3 shows an experimental example of measuring
the vibration transmitted to the central portion of the surface of the connector 1 → cable 22 →
door inner panel 20a when a signal is input to the cable 22. The vertical axis indicates the
magnitude of the vibration generated at the central portion of the surface of the door inner panel
20 a in acceleration (dB), and the horizontal axis indicates the frequency of the signal input to the
cable 22. A waveform W1 indicates a vibration that occurs in the central portion of the door
inner panel 20a when a signal is input. In the waveform W1, as the frequency increases, the
vibration generated in the central portion of the surface of the door inner panel 20a also tends to
increase. On the other hand, the waveform W2 indicates the magnitude of vibration that occurs
naturally in the central portion of the surface of the door inner panel 20a when no signal is input
to the cable 22. That is, the vibration corresponding to the difference between the waveforms W
1 and W 2 is a vibration generated by inputting a signal to the speaker device 10, that is, a
vibration transmitted from the speaker device 10 to the door inner panel 20 a via the cable 22. It
can be seen that it is. As described above, when the sound is reproduced through the speaker
device 10, the vibration generated from the speaker device 10 is transmitted to the door inner
panel 20a which is the attachment surface of the cable 22, and an abnormal sound is emitted in
the car. In the present invention, the vibration of the speaker is prevented from being transmitted
to the cable, and the generation of abnormal noise due to the vibration of the door inner panel is
prevented by the following embodiments. First Embodiment In the first embodiment, the cable
22 is bent in the vicinity of the connector 1 of the speaker device 10 to absorb the vibration of
the connector 1 and prevent it from being transmitted to the door inner panel 20 a. FIGS. 4 and 5
show an example of the cable 22 shaped to absorb the vibration from the connector 1.
4 (a) to 4 (d) show the first to fourth examples of the cable shape, FIGS. 5 (a) and 5 (b) show the
fifth example, and FIGS. 5 (c) and 5 (d) show the fifth example. Six examples are shown. 5 (b) is a
plan view from the upper side of FIG. 5 (a), and FIG. 5 (d) is a plan view from the upper side of
FIG. 5 (c). In the first example shown in FIG. 4A, the portion in the vicinity of the connector 1 of
the cable 22 is curved upward substantially with respect to the surface of the door inner panel
20a to have a substantially elliptical shape (broken line portion K1 reference). In the second
example shown in FIG. 4B, the portion in the vicinity of the connector 1 of the cable 22 is curved
above the surface of the door inner panel 20a so as to be substantially U-shaped (see the broken
line portion K2). In the third example shown in FIG. 4C, the portion in the vicinity of the
connector 1 of the cable 22 is wound once so as to be substantially circular above the surface of
the door inner panel 20a (see the broken line portion K3). In the fourth example shown in FIG.
4D, the portion in the vicinity of the connector 1 of the cable 22 is wound multiple times so as to
be spring-shaped above the surface of the door inner panel 20a (see the broken line portion K4).
In the fifth example shown in FIGS. 5A and 5B, the portion of the cable 22 in the vicinity of the
connector 1 is curved to be substantially circular in a plane substantially parallel to the surface
of the door inner panel 20a. (See dashed line K5). In the sixth example shown in FIGS. 5C and 5D,
the portion in the vicinity of the connector 1 of the cable 22 is curved in a substantially S shape
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in a plane substantially parallel to the surface of the door inner panel 20a (broken line K6 See).
The curved portion exemplified above is provided in the vicinity of the connector 1. As shown in
FIG. 2A, the cable 22 is fixed to the door inner panel 20a by a plurality of fixing members 21.
However, as shown in FIG. 4 and FIG. It is provided between the fixing member 21 close to the
connector 1 and the connector 1. Thus, the vibration of the cable 22 (in the audio amplifier
direction) ahead of the fixing member 21 is suppressed. As described above, in the first
embodiment, the shape of the cable 22 in the vicinity of the connector 1 is a curved shape etc.,
and the vibration applied to the connector 1 from the frame 2 is absorbed at that portion and not
transmitted to the cable 22 Let's do it. As a result, the vibration of the speaker body is
transmitted to the door inner panel 20a through the cable 22, and it is possible to prevent an
abnormal sound from being generated. The shape of the cable 22 shown in FIGS. 4 and 5 is
merely an example, and any other shape may be adopted as long as it can absorb vibration.
Moreover, you may combine two or more shapes of the cable 22 shown in FIG.4 and FIG.5. The
cable 22 shown in FIGS. 4 and 5 is formed so as not to lose its shape. Second Embodiment In the
second embodiment, by interposing a vibration absorbing member for absorbing vibration
between the connector member on the speaker device side and the frame, the vibration of the
frame is not transmitted to the connector. It is characterized in that The present embodiment will
be described with reference to FIG. 6 and FIG. The external shape of the vibration absorbing
member 30 is shown in FIG. 6 as a perspective view. As the vibration absorbing member 30, a
vibration absorbing material such as anti-vibration rubber or an elastomer is suitable. As shown
in FIG. 6, the vibration absorbing member 30 has a substantially T-like shape, and the surface
portion 30c and the back surface portion 30b are flat. Further, a protruding portion 30d is
formed to protrude from a portion of the surface portion 30c of the vibration absorbing member
30, and a rectangular through hole 30a is formed in the protruding portion 30d. The shape of
the vibration absorbing member 30 shown in FIG. 6 is merely an example, and the shape of the
vibration absorbing member 30 is determined according to the shapes of the connector and the
frame. FIG. 7 shows an enlarged view of the vicinity of the connector member 31 in the speaker
device 50 of the present embodiment. The connector member 31 is a connector member on the
speaker main body side of the speaker device 50, and is connected to the connector member on
the speaker cable side. As shown in FIG. 7A, an overhanging piece 2a for attaching the connector
member 31 and the vibration absorbing member 30 is formed on the frame 2 so as to extend
downward. As shown in FIGS. 7A and 7B, the overhanging piece 2a is formed with a protrusion
2aa so as to protrude from the vicinity of the surface center. As shown in FIG. 7B, the protrusion
2aa serves to fix the vibration absorbing member 30 and the connector member 31 respectively.
Further, on both sides of the overhanging pieces 2a, tinsel cords 2b extend from the frame 2 as
shown in FIG. 7 (a). The tip of each tinsel wire 2b is fixed to each conductive attachment portion
2c attached to the frame 2 by a method such as soldering. Next, a method of attaching the
vibration absorbing member 30 and the connector member 31 will be described with reference
to FIGS. 7 and 7B. First, the vibration absorbing member 30 is attached to the overhanging piece
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2 a of the frame 2, and then the connector member 31 is attached to the overhanging piece 2 a
of the frame 2.
Thus, the vibration absorbing member 30 is interposed between the overhanging piece 2 a of the
frame 2 and the connector member 31. Specifically, first, the protrusion 2aa formed on the
overhanging piece 2a is inserted into the through hole 30a formed on the vibration absorbing
member 30, and the flat surface portion 2ab of the overhanging piece 2a and the vibration
absorbing member 30 is brought into close contact with the back surface 30b. At this time, the
inner side surface of the through hole 30a of the vibration absorbing member 30 is in close
contact with the surface of the protrusion 2aa formed on the overhanging piece 2a. Next, the
protruding portion 2 aa of the overhanging piece 2 a is inserted into the through hole 31 b
formed in the connector member 31 so that the surface portion 30 c of the vibration absorbing
member 30 and the back surface portion 31 c of the connector member 31 are in close contact.
Each conductive attachment portion 2c is electrically connected to the male terminal fitting 31a
of the connector member 31 so that a signal and / or power can be supplied to the speaker
device 50 from the audio amplifier side (not shown). As described above, in the speaker device
50 according to the present embodiment, the vibration absorbing member 30 for absorbing
vibration is interposed between the overhanging piece 2 a of the frame 2 and the connector
member 31, so the following effects can be obtained. Play. That is, when the diaphragm 3
vibrates during reproduction of sound by the speaker device 50, vibration occurs in the direction
of arrows s8 to s10 shown in FIGS. 7A and 7B in the frame 2 of the speaker device 50. Do.
However, since such vibration is absorbed by the vibration absorbing member 30, the vibration
can be prevented from being transmitted to the connector member 31. Therefore, even if the
connector member 31 and the connector member (not shown) on the audio amplifier side are
connected, the vibration is not transmitted to the cable 22 extending from the connector member
on the audio amplifier side. Therefore, the vibration which the speaker apparatus 50 generate ¦
occur ¦ produces can be transmitted to the door inner panel 20a, and it can prevent generating
abnormal noise. In the present embodiment, since the vibration is absorbed by the vibration
absorbing member 30, the connector member 31 hardly vibrates. Therefore, the contact portion
between the terminal fitting of the connector member on the audio amplifier side and the
terminal fitting of the connector member 31 on the speaker device 50 hardly rubs. Therefore,
when the speaker device 50 is used for a long period of time, it is possible to prevent the contact
portion of the terminal fitting from being abraded to cause conduction failure of the connector.
[Modification] In the first embodiment, the cable 22 in the vicinity of the speaker device 10 has a
curved shape, and in the second embodiment, between the frame 2 of the speaker device 50 and
the connector member 31 By interposing the vibration absorbing member 30, the vibration of
the speaker is prevented from being transmitted to the door inner panel 20a.
Furthermore, the first embodiment and the second embodiment may be combined. That is, the
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vibration absorbing member may be provided between the frame of the speaker and the
connector member, and the cable may have a curved shape in the vicinity of the speaker. In the
above embodiment, the case where the speaker devices 10 and 50 are attached to the door inner
panel 20 a on the driver's seat side is taken up, but the door inner panel 20 a on the passenger
seat side or the left and right rear seat side and other speakers Of course, the application of the
present invention is possible as long as the device 10, 50 is installed. Further, the present
invention can be applied not only to in-vehicle speaker devices, but also to various types of
speaker devices such as wall-mounted speaker devices that require fixing of a cable to an object
to which the speaker device is attached. . BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a
cross-sectional view showing an entire configuration of a speaker device according to the present
invention. FIG. 2 is a perspective view and a side view showing a state in which the speaker
device of the present invention is attached to a door inner panel of a vehicle. FIG. 3 shows an
example of measurement of vibration generated at a central portion of a door inner panel
surface. FIG. 4 shows an example of the shape of the cable according to the first embodiment.
FIG. 5 shows another example of the cable shape according to the first embodiment. FIG. 6 is a
perspective view of a vibration absorbing member used in the speaker device according to the
second embodiment. FIG. 7 shows a configuration of a speaker device according to a second
embodiment. Explanation of the code 1 connector 2 frame 3 diaphragm 4 damper 5 voice coil
bobbin 6 voice coil 7 pole piece 8 plate 9 magnet 10, 50 speaker device 20 door 21 fixed
member 22 cable 30 vibration absorbing member
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