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JPH05130688

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DESCRIPTION JPH05130688
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus in which unnecessary vibration of a speaker cabinet is reduced.
[0002]
2. Description of the Related Art In recent years, digitization of input sources has been promoted
for both hi-fi and general, and in order to reproduce information possessed by inputs without
exhaustion, a speaker apparatus as the reproduction apparatus is required to have more
quietness. It is coming.
[0003]
Ideally, the speaker unit emits sound from the speaker unit and the other parts do not vibrate at
all.
In some cases, it is also found that the vibration from the speaker cabinet is used cleverly and is
evaluated as having high musicality for a specific input. However, generally speaking, in order to
cope with all input sources, it can be said that as described above, a speaker device in which
sound is emitted only from the speaker unit is required. In loudspeaker systems, the largest
source of unwanted vibration that prevents this ideal condition is the loudspeaker cabinet, and
on average the sound pressure is approximately -30 dB to -40 dB of the sound pressure from the
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speaker unit Has reached.
[0004]
Heretofore, means for increasing the thickness of the speaker cabinet, using a highly rigid
material, or sticking a sound absorbing or visco-elastic material on the surface of the speaker
cabinet have been conventionally used as a solution. In addition, there are also technologies that
try to solve structurally.
[0005]
Hereinafter, with reference to the drawings, an example of a conventional speaker device to be
solved structurally as described above will be described. FIG. 3 is an example showing a partial
cross-sectional side view of a structure for reducing vibration of a speaker cabinet in a
conventional speaker device. In FIG. 3, 1 is a speaker unit, 2 is a speaker cabinet to which the
speaker unit 1 is mounted, 3 is a sound absorber mounted to the speaker cabinet 2, 4 is a
reinforcement mounted to the speaker cabinet 2, 5 Reference numeral 8 denotes a slit provided
on the front baffle of the speaker cabinet 2 for preventing propagation of vibration, and 6
denotes a sound absorber inserted into the slit 5.
[0006]
However, the conventional speaker apparatus as described above has the problem that it is
necessary to increase the weight of the speaker apparatus in order to increase the rigidity. In
addition, it was difficult to substantially suppress unnecessary vibration. In addition, it is not
practical to attach a sound absorber to the entire surface of the speaker cabinet, as it is a design
problem and an efficient production problem.
[0007]
The present invention has been made in view of the above-described conventional problems, and
aims to provide a speaker device capable of actively canceling vibration from a method of
suppressing vibration passively.
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[0008]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the speaker
apparatus according to the present invention is provided in accordance with the vibration
detecting means for picking up the vibration of the speaker cabinet and the vibration of the
speaker cabinet detected by the vibration detecting means. It comprises a system comprising a
signal generator that generates a signal that cancels the vibration.
[0009]
According to the present invention, the vibration detection means of the speaker cabinet is
detected by the vibration detection means attached to the front, back, both sides, top, bottom,
and in some cases a part of the front of the speaker cabinet. The signal is phase-reversed and
passed through an amplifier to provide the signal generator with a signal having the required
amplification factor and in antiphase with the speaker cabinet.
The signal generator is mounted at the same position as or in proximity to the vibration detecting
means, and forcibly vibrates the speaker cabinet with a signal having the same amplitude and the
opposite phase as the vibration of the speaker cabinet.
As a result, the above-mentioned each surface or a part of the speaker cabinet is self-vibration
excited by the speaker unit, and as a result of being forcibly vibrated in the opposite phase by the
vibration generating device, the speaker cabinet does not vibrate. It becomes equal to In this way,
a speaker device with extremely low unnecessary vibration of the speaker cabinet is realized.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the
speaker apparatus according to the present invention will be described in detail with reference to
FIGS.
[0011]
FIG. 1 shows a partial cross-sectional side view of a speaker device for reducing unnecessary
vibration in an embodiment of the present invention.
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FIG. 2 shows a block diagram of a circuit in an embodiment of the present invention. In FIGS. 1
and 2, reference numeral 1 denotes a speaker unit as viewed from the inside of the speaker
cabinet, and the speaker unit 1 is attached to the front plate 7 of the speaker cabinet. The
vibration pickup 8 is attached to a portion where the vibration of the front plate 7 is the largest
and a portion of an antinode of the primary vibration. The signal picked up by the vibration
pickup 8 is phase inverted by the phase inverter / amplifier 9 and amplified to an appropriate
signal level. The signal from the phase inverter amplifier 9 is applied to the actuator 10. The
actuator 10 is mounted at a position close to the vibration pickup 8 of the front plate 7 or at the
same position.
[0012]
In the above embodiment, although the embodiment is a front plate, the present invention can be
similarly configured for both side plates, a top plate, a back plate, and a bottom plate of a speaker
cabinet. Moreover, depending on the case, the effect can be effectively and inexpensively
achieved by carrying out a part thereof.
[0013]
The operation of the loudspeaker apparatus configured as described above will be described
below. First, the speaker unit 1 excited by various input signals radiates the reproduction signal
into space and transmits it to the front plate 7. Further, sound pressure and standing waves
generated inside the speaker cabinet also excite vibrations in the front plate 7. In addition, direct
waves from the speaker unit also excite the vibration of the speaker cabinet in the high
frequency range. As described above, the front plate 7 vibrates differently from the input signal
applied to the speaker unit 1 by the signals excited by various elements and the natural vibration,
and emits its own sound to the space. The vibration of the front plate 7 is faithfully detected by
the vibration pickup 8 attached to the front plate 7 and is converted into an electric signal. The
mounting position of the vibration pickup 8 is usually set at the belly portion of the primary
vibration of the front plate 7 with the largest effect, but in order to increase the effect of the
second or third vibration belly It is also possible to install in a part.
[0014]
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The electric signal excited by the vibration pickup 8 is applied to the phase inverter / amplifier 9
and converted into a phase opposite to the signal excited by the vibration pickup 8, ie, the
vibration of the front plate 7, and sufficient to drive the actuator 10, The electric signal amplified
to the amplitude necessary to cancel the vibration of the front plate 7 is applied to the actuator
10. The actuator 10 is attached to the front plate 7 at the same position as the vibration pickup 7
when the actuator 10 and the vibration pickup 8 are coaxially arranged at a position close to the
vibration pickup 8 or structurally. The applied signal excites the actuator 10 to vibrate and the
vibration is transmitted to the front plate 7. Since this vibration is set to have the same amplitude
as the vibration of the front plate 7 in the same phase as the vibration of the front plate 7, the
signal applied from the actuator 10 to the front plate 7 functions to forcibly suppress the
vibration of the front plate 7. As a result, the vibration of the front plate 7 is suppressed by the
actuator 10.
[0015]
As described above, according to this embodiment, unnecessary vibration of the front plate 7 can
be suppressed. Moreover, it is preferable to simultaneously implement this embodiment on both
sides of the speaker cabinet and the back plate, the top plate, and the bottom plate.
[0016]
As described above, according to the present invention, the unnecessary vibration of the speaker
cabinet caused by various causes is changed to a passive method or a conventional method in
which measures are separately taken for each cause, and a vibration pickup and an actuator are
provided. Is one of the biggest problems of the present speaker device, which can be effectively
suppressed regardless of the vibration form of unnecessary vibration and fluctuation of vibration
level by using・ It is possible to eliminate the unnecessary vibration of the cabinet.
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