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JPH11215579

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH11215579
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
panel type speaker device suitable for use in a speaker system such as a navigation system and a
radio receiver mounted on, for example, a passenger car.
[0002]
2. Description of the Related Art Passenger cars and the like are equipped with sound
reproducing devices such as radio receivers and car stereo devices. Recently, navigation systems
for providing road guidance and alarm devices for notifying the driver of various alarms are also
included. It is equipped with an option. For example, in a radio receiver and a car stereo device,
the speaker device is generally disposed on the back grille of the rear seat, and is also disposed
on a dashboard or a front door.
[0003]
The navigation system has a function of displaying road guidance by a display device as an
image, and at the same time, a content corresponding to the display image is voice-guided
through a speaker device. The speaker device is generally installed on a dashboard or a front
door of an optional device such as a navigation system or an alarm device.
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[0004]
On the other hand, in a home or in a room of a hotel, a look-ahead used to make up and prepare
clothes is disposed at an appropriate position. In recent years, for example, so-called "seven
family" has been increasing while receiving makeup while listening to radio broadcasts and
listening to music from sound reproduction devices. Therefore, it is extremely convenient if a
radio receiver and a sound reproduction device are installed near the sight seeing, and makeup
etc. are performed with a good feeling. In a hotel or the like, appropriate background music is
played through a speaker device disposed indoors. The speaker device needs to be disposed so as
not to impair the atmosphere in the room, and is preferably disposed at various places in the
room to emit background music at a volume level that does not disturb the background music.
[0005]
By the way, a cone type dynamic speaker, a horn type dynamic speaker, etc. are generally used as
a speaker apparatus. For example, a cone-type dynamic speaker includes a diaphragm formed in
a conical shape, a driver unit for driving the diaphragm, a frame for supporting the outer
peripheral edge of the diaphragm, and a cabinet or the like that accommodates these members. It
is comprised by the member. The driver unit is constituted by members such as a voice coil, a
pole, a plate, a magnet, a damper and a center cap.
[0006]
The diaphragm is formed in a basic shape of the above-described conical shape by a lightweight
material having a large internal loss, and the driver unit is disposed at the central portion thereof.
Generally, the thickness of the diaphragm is gradually reduced from the inner peripheral portion
toward the outer peripheral portion, and the outer peripheral edge portion is supported by the
frame over the entire circumference via arrows. The frame is a member that couples the
diaphragm and the driver and also exerts a protective function of the diaphragm. The frame is
generally formed with a notch window so that the diaphragm is not affected by the reaction due
to its vibration operation. The arrows act to hold the outer peripheral edge of the diaphragm and
to prevent contact with the mounting portion of the cabinet when the diaphragm vibrates.
[0007]
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On the other hand, the horn type dynamic speaker is such that the vibration sound of the
diaphragm driven by the voice coil is enlarged and emitted by the horn, and the above-mentioned
cone type dynamic speaker has a basic configuration other than having the horn. It is considered
equivalent to a speaker. That is, also in the horn type dynamic speaker, the magnet, the pole
integrally assembled at the tip thereof, the yoke surrounding the periphery of the pole, and the
plate having the opening facing the pole and assembled to the yoke The driver unit is configured,
and the diaphragm is vibrated by the driver unit.
[0008]
The diaphragm is formed in a spherical shape by a light metal such as aluminum or a synthetic
resin. The diaphragm is connected to the plate at its outer peripheral edge so as to face the pole
by closing the opening. The diaphragm is smaller than the diaphragm of the above-mentioned
cone type dynamic speaker and has high mechanical rigidity because the resonance of the
vibration system may be in the approximately central region of the reproduction band. Therefore,
the diaphragm is coupled to the plate without the damper, and its periphery is vibrated by the
driver unit. In other words, also in the horn type dynamic speaker, the diaphragm thereof is
supported with its outer peripheral portion fixed as in the diaphragm of the cone type dynamic
speaker.
[0009]
In the meantime, many attempts have been made to realize a so-called panel type speaker device
which is thin without requiring a box or the like and can be installed at an arbitrary position.
However, none of these attempts have led to the realization of an ideal panel-type speaker device
due to technical limitations, acoustic performance limitations, etc. Many of these attempts have
been based on the cone type dynamic speaker and the horn type dynamic speaker described
above.
[0010]
As a thin speaker device, for example, a capacitor-type speaker in which a panel-shaped
diaphragm is disposed opposite to a fixed pole with a minute gap is known. In a capacitor type
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speaker, generally, a thin metal film is formed on a diaphragm and a DC bias voltage of several
hundreds volts is applied between the diaphragm and a fixed electrode. When a reproduction
signal is input to the fixed pole, the diaphragm vibrates due to a change in magnetic attraction
with the fixed pole. In addition, as a capacitor type speaker, a push-pull type speaker adapted to
correspond to the whole band is also provided by arranging a fixed pole with a diaphragm
interposed therebetween.
[0011]
As described above, it is necessary to apply a voltage of several hundred volts to the sound
output part as described above, so it is difficult to freely install it anywhere, and it is stable due to
changes in temperature and humidity conditions. It has the problem of low sex. In addition, the
capacitor-type speaker has a problem that the maximum undistorted output sound pressure level
obtained for the input voltage is smaller than that of the above-described dynamic speaker device
because the input voltage is regulated to the DC bias voltage. Furthermore, the capacitor-type
speaker has various problems such as an increase in size of the diaphragm in order to secure
stable frequency characteristics in the entire band.
[0012]
By the way, since the speaker apparatus such as the navigation system is installed on the
dashboard and the front door as described above, it becomes lower than the position of the
driver's ear and compared It will be in the state of being located far away. Therefore, the speaker
device has a problem that the sound guide and the alarm sound to be emitted are masked by the
engine sound and the traveling sound and the driver can not sufficiently hear the sound guide
and the alarm sound. Further, the speaker device has a problem that the voice guide and the
warning sound emitted can not be sufficiently heard by the passenger in the front passenger seat
and the rear seat located further away.
[0013]
The problems with the speaker device such as the navigation system can be improved by
providing a speaker device with higher output. However, a speaker device such as a navigation
system must be small because it is installed in a limited space in a car. In the above-mentioned
various conventional speaker devices, it has been difficult to adopt a large size in order to
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maintain sufficient sound volume and good sound quality and directivity to a passenger.
[0014]
By the way, in the speaker device, it is generally considered that when the reproduction input
signal is supplied, the diaphragm acts as a piston by the driver unit to perform output
reproduction. Therefore, also in the panel type speaker device, an attempt has been made to
manufacture a high-precision flat diaphragm which operates in the same manner as the
diaphragm of the conventional speaker device described above by the electromagnetic drive
method or electrostatic drive method. For example, in the electrostatic drive type diaphragm, the
outer peripheral portion is supported with a predetermined tension, and when the driving force
from the driver unit is applied, waves are continuously generated concentrically from the driving
position. . Such diaphragms must solve various problems resulting from large area piston motion
that results in sound concentration and uncontrollable vibrations by operating as a large single
phase diaphragm.
[0015]
On the other hand, as a panel type speaker device, a speaker device having a novel panel
structure in which a diaphragm is driven by a driver unit based on bending wave theory has been
proposed. In this novel panel-type speaker device, the diaphragm is constituted by a rigid panel
structure having relatively high mechanical rigidity, and when a driving force is applied from the
driver unit, a complex vibration mode is generated over the entire surface of the diaphragm. Be
done. The vibration mode is the most complex and densely-packed waveform structure uniformly
distributed over the operating frequency range of the flat panel (diaphragm). The novel paneltype loudspeaker device is characterized by the analysis of the physical properties of the bending
wave with respect to a diaphragm of finite size, the speed-frequency characteristic of the wave
and the driving point impedance characteristic.
[0016]
The novel panel-type speaker device uses a flexural rigidity diaphragm whose parameter is
optimized according to the intended application, and can operate up to the lower frequency band
of the coincident frequency. In the novel panel-type speaker device, in order to secure a bending
mode of maximum density from the diaphragm in general, the vicinity of the center point of the
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diaphragm is driven by the driver unit. The diaphragm has been demonstrated by mathematical
modeling tools with specific aspect ratios that give uniform mode density by finite element
analysis. In addition, in the novel panel type speaker device, the supply position of the driving
force to the diaphragm which achieves the best mode uniformity is determined by Fourier type
analysis. And, in the novel panel type speaker device, although expansion of Fourier type analysis
causes some loss in the high frequency band, it is also possible to drive a diaphragm having a
larger area. The diaphragm is expressed by an equation of bending stiffness which approximates
the bending equation of a more general static beam by taking the zero frequency limit of the
wave function.
[0017]
The novel panel type speaker device is a factor that defines the bending operation of the
diaphragm, ie, area density, bending stiffness, geometric dimension (outer dimension), surface
area, position of driving point, and parameters of drive unit, core shear module , Internal loss, or
parameters of the supporting method of the diaphragm are set optimally. In a general speaker
device, the rear sound, called a dipole, has an antiphase with the sound of the front, so a large
baffle plate or enclosure is required to prevent cancellation of acoustic energy in the middle to
low frequency bands. Do. On the other hand, in the novel panel type speaker device, the radiation
of the rear sound, which is called bipolar, is added to the sound of the front, so that the efficiency
can be improved and the baffle plate and the enclosure are unnecessary.
[0018]
The novel panel-type speaker device enables full-range output reproduction with a single panel
diaphragm driven by a single-element transducer. The novel panel-type speaker device can
obtain flat frequency characteristics equivalent to those of the conventional speaker device by
selecting the appropriate material of the diaphragm and the configuration adapted to the
transducer.
[0019]
The novel panel-type speaker device not only achieves compatibility with the existing amplifier
by making the sensitivity and the electrical load equal to those of the conventional speaker
device, but also makes it possible to use an electrodynamic driver unit and a piezoelectric driver
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unit. Application is made possible, and very broad sound field radiation patterns as well as bidirectional radiation patterns are obtained. The novel panel-type loudspeaker system has the
property of converting the mechanical energy to the acoustic energy almost 100% and the
property of non-directional radiation independent of frequency, ie, large uniformity of sound
power for each frequency. ing. The novel panel type speaker device is characterized in that the
attenuation of the sound power due to the condition of distance is small, and has other various
characteristics due to its novel configuration.
[0020]
The present invention is based on a novel panel-type speaker device based on bending wave
theory in which bending operation is caused to drive a diaphragm based on a reproduction input
signal by the above-mentioned driver unit to drive and drive output, and a diaphragm is a
diaphragm For example, it is proposed to provide a novel panel-type speaker device capable of
configuring a speaker device of a navigator system mounted on a passenger car or the like by, for
example, a rearview mirror device.
[0021]
SUMMARY OF THE INVENTION In the panel type speaker device according to the present
invention for achieving this object, the substrate is formed into a panel shape having rigidity by
glass, a transparent synthetic resin material or the like, and the outer peripheral portion is
substantially non- An end plate supported in a restricted state, and at least one driver unit
attached to the main surface of the end plate and constituting a vibration source to generate a
partial bending operation based on a reproduction input signal; Configured
[0022]
Further, in the panel type speaker device, the end plate is an end plate of a rearview mirror
device for a car, and is configured as a mounted sound reproduction device or a diaphragm of a
navigation system or a speaker device of an alarm device.
[0023]
According to the panel-type speaker device of the present invention configured as described
above, the end plate acts as a vibrator that is driven by the driver unit based on the supplied
reproduction input signal and emits the reproduction output.
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Therefore, the panel type speaker device can be greatly expanded in the application field since it
is configured by a mirror which can not be considered conventionally.
A panel-type speaker device is configured such that a voice guide, an alarm sound, etc. are
masked by an engine sound or a traveling sound by configuring a speaker device such as a
navigation system mounted using an end plate of a rearview mirror device for automobiles as a
diaphragm. In addition, the sound volume and the sound quality of the driver are good enough
for the driver as well as the passenger.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described in detail with reference to the drawings.
As shown in FIG. 1, the panel-type speaker device 1 shown as the embodiment of the present
invention doubles as, for example, a rearview mirror device installed in a passenger car 2, and for
example, a navigation device main body incorporated in a console box 2a. A speaker device is
connected to 3 to notify a driver of a voice guide, a warning and the like. That is, as described in
detail later, the panel-type speaker device 1 is configured by the mirror plate (end plate) 4 of the
rearview mirror device, the driver unit 5, the mirror cover 6, and the like. The panel type speaker
device 1 causes the driver unit 5 to generate a partial bending operation based on a reproduction
input signal such as a voice guide or an alarm sound supplied from the navigation device main
body 3 to the mirror plate 4 to emit a reproduction output. In addition to being configured as a
vibrating diaphragm, a driver unit 5 for driving the mirror plate 4 is incorporated in the mirror
cover 6.
[0025]
As well known, the navigation apparatus comprises, for example, a color monitor (display unit),
and a tuner unit, an equalizer unit, and a speaker unit, but the units other than the speaker
device are integrally formed for the convenience of description. It shall be generically called
navigation apparatus main body 3. As described above, the navigation device main body 3 is
disposed not only at the console box 2a but also at an appropriate position in the vehicle, for
example, a dashboard or the like within a range that does not affect the driving.
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[0026]
Like the conventional rearview mirror device, the panel-type speaker device 1 is supported by
the mirror cover 6 at the end of the mounting arm 6a provided with the mount 6b at one end via
a universal joint mechanism 6c whose details are omitted. . As shown in FIG. 2, the mirror cover
6 is formed in a generally rectangular shallow dish shape, and is protected by the outer
peripheral flange portion 6 d extending around the outer peripheral portion 4 c of the mirror
plate 4. A mounting arm 6a is attached to the rear surface side of the bottom surface 6e of the
mirror cover 6 via a universal joint mechanism 6c, and a driver unit 5 is attached to the inner
surface side.
[0027]
As shown in FIG. 1, the panel-type speaker device 1 is configured such that the mounting base 6
b is attached to the ceiling in the vehicle such that the mirror plate 4 is positioned at the upper
center of the windshield 2 b. In the panel-type speaker device 1, the angle of the mirror plate 4 is
adjustable via the universal joint mechanism 6 c described above, and the angle of the mirror
surface 4 a is appropriately adjusted according to the driver. The mirror surface 4a constitutes a
sound emitting surface as described later. Although not shown, in the panel type speaker device
1, a reproduction output signal such as a voice guide or a warning is supplied to the driver unit 5
from the navigation device body 3 through a wire which leads the inside of the mounting arm 6a.
[0028]
The mirror plate 4 is configured of a plane mirror, a convex mirror capable of further securing a
rear view, or an anti-glare mirror combining an ordinary mirror and a polarizing mirror and
switching the mirror. As shown in FIGS. 2 and 3, the mirror plate 4 has a reflective layer 8 on the
back surface of a panel-like transparent substrate 7 formed of, for example, glass or a
transparent or translucent synthetic resin material having sufficient light transmittance. It forms.
For the glass, laminated tempered glass is used in consideration of impact resistance and safety.
As a synthetic resin material, for example, acrylic resins, polycarbonate resins, polyester resins,
cellulose resins such as triacetyl cellulose and diacetyl cellulose, styrene resins and the like are
used. In addition, as mirror plate 4, while giving mirror processing to the surface using a metal
plate material with high reflection efficiency, and carrying out appropriate rustproofing
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treatment, it is also used.
[0029]
The reflective layer 8 is formed by a well-known method, and silver or amalgam is applied to the
back of the transparent substrate 7 and silvered, and a paint containing a light pigment as a
component is applied and then a shellac varnish or a white varnish is applied. Perform backing
and form. The mirror plate 4 is configured as a driven surface 4 b whose rear surface on which
the reflection layer 8 is formed is driven by the driver unit 5.
[0030]
The mirror plate 4 is configured to have rigidity as a whole by being formed as described above,
but as shown in FIG. 2, the outer peripheral portion 4 c is not restrained with respect to the outer
peripheral flange portion 6 d And is held by the mirror cover 6. Therefore, the mirror plate 4 is
configured such that the outer peripheral portion 4c freely vibrates when driven by the driver
unit 5 as described later.
[0031]
As the driver unit 5, a voice coil type driver unit provided in a conventional speaker device or a
piezoelectric type driver unit using a piezoelectric element is used, and as described above, the
mirror plate 4 is driven as a diaphragm. The piezoelectric driver unit is effective because it can
be configured to be thin and compact as a whole because it is configured by a thin piezoelectric
element although details are omitted.
[0032]
FIG. 3 shows the voice coil type driver unit 5. The driver unit 5 comprises a voice coil 9 and a
magnetic circuit 10 for driving the voice coil 9 based on a reproduction input signal. The voice
coil 9 comprises a bobbin 11 and a coil portion 12 formed by providing a winding wire around
the outer periphery of the bobbin 11. The magnetic circuit 10 is combined with the center pole
13, the ring-shaped magnet 14 combined by penetrating the center pole 13 into the center hole,
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and the center pole 13 facing the center hole 13 in a stacked state It comprises a ring-shaped
plate 15 and members such as a damper 16. The driver unit 5 is supported by the damper 16
such that the voice coil 9 is positioned in the magnetic space formed by the center pole 13 and
the plate 15. The damper 16 connects between the bobbin 11 and the plate 15 of the voice coil
9.
[0033]
The driver unit 5 configured as described above is combined with the mirror plate 4 constituting
the diaphragm by joining the tip end portion of the bobbin 11 to the driven surface 4b of the
mirror plate 4 as shown in FIG. Be Further, the driver unit 5 is incorporated in the inside of the
mirror cover 6 by fixing the center pole 13 to the bottom 6e of the mirror cover 6 via the set
screw 17 of the flange portion 13a. In the driver unit 5, for example, a ring-shaped mounting
plate may be fitted to the end opening of the bobbin 11 and fixed to the mirror plate 4 through
the mounting plate.
[0034]
In the panel-type speaker device 1 configured as described above, when the reproduction input
signal (audio current) such as an audio guide or a warning is supplied from the navigation device
body 3 to the driver unit 5, the mirror plate 4 is driven to Sound emission of the reproduction
output is performed from the sound emission surface 4a. When an audio current is supplied to
the voice coil 9 located in the magnetic space portion of the magnetic circuit 10, the driver unit 5
vibrates the voice coil 9 in the direction orthogonal to the mirror plate 4. In the panel-type
speaker device 1, a partial bending operation occurs in the mirror plate 4 with the bonding
portion of the voice coil 9 to the bobbin 11 as a driving point, and sound emission of
reproduction output such as a voice guide or a warning is performed.
[0035]
FIG. 4 is a view showing an operation state of the mirror plate 4 driven by the driver unit 5 in the
panel type speaker device 1 described above. The figure (A) is the figure which showed the
operation state of the mirror plate 4 at the time of supplying the reproduction ¦ regeneration
input signal whose input frequency is 62 Hz. Further, FIG. 6B is a diagram showing an operation
state of the mirror plate 4 when the reproduction input signal having an input frequency of 150
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Hz is supplied. Further, FIG. 6C is a diagram showing an operation state of the mirror plate 4
when the reproduction input signal having an input frequency of 501 Hz is supplied. As is
apparent from these figures, the mirror plate 4 is bent when the reproduction input signal is
applied from the driver unit 5 to generate a complex vibration mode. Also, the mirror plate 4
produces a bending operation having a larger peak as the frequency of the reproduction input
signal becomes higher.
[0036]
Further, FIG. 5 shows that when a reproduction input signal having an input frequency different
from 100 Hz, 1 KHz, 10 KHz and 20 KHz is supplied to the driver unit 5 with respect to the panel
type speaker device 1 described above, the mirror unit It is the figure which showed the result of
having measured the directivity characteristic of the reproduction ¦ regeneration output by
which 4 is driven and emitted. As described above, the panel-type speaker device 1 doubles as a
rearview mirror device and is disposed at an upper central portion of the vehicle, so an engine
sound and a running sound from which a voice guide and a warning to be reproduced come from
the lower portion The masking by is suppressed and reproduced and output in a clear state.
[0037]
As apparent from FIG. 5, the panel-type speaker device 1 can obtain sufficient volume for each
input frequency despite the fact that the mirror plate 4 is driven by the driver unit 5 having the
small magnetic circuit 10. , Enables reproduction output in a wide frequency band. Further, since
the panel type speaker device 1 has good directional characteristics even in the high frequency
band, voice guidance and warning etc. are good not only for the driver but also for the passenger
in the front passenger seat and the rear seat. It is possible to listen in the state.
[0038]
As described above, the panel-type speaker device 1 constitutes a novel navigation device by
directly driving the mirror plate 4 constituting the diaphragm without requiring a resonance box,
an acoustic tube or the like. In addition, since panel type speaker device 1 does not require a
supporting member such as an arrow sheet or a frame for supporting outer peripheral portion 4c
of mirror plate 4 forming the diaphragm, the structure is limited because of its small size and
simple structure. It can be housed inside the mirror cover 6 in the above-mentioned space and
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the number of parts is small, and the assembly process is rationalized to reduce the cost.
Furthermore, since the mirror plate 4 has a large vibration area, the panel type speaker device 1
enables reproduction output such as voice guidance and warning in a better volume and in a
better state as compared with the conventional built-in speaker device. .
[0039]
By the way, in the panel type speaker device 1, as described above, the driver unit 5 joins and
fixes the end of the bobbin 11 to the driven surface 4 d of the mirror plate 4 to make the drive
unit for the mirror plate 4 in this junction. Configured. For this reason, the panel type speaker
device 1 has a feature that it is difficult to transmit a large vibration to the outside of the bobbin
11 when the input frequency in the high frequency band is applied. In the panel-type speaker
device 1, much of the energy of the sound pressure radiated with respect to the input frequency
in the high frequency band is emitted not from the entire mirror plate 4 but from its junction.
[0040]
In the panel-type speaker device 1, the driver unit 5 is attached to the mirror plate 4 via the oval
ring-shaped or rectangular joint portion of the driver unit 5 to the mirror plate 4 in order to
extend the effective band in the high frequency band You may configure it. In the panel type
speaker device 1, the characteristics of the high frequency band are changed by the junction
structure of the mirror plate 4 and the driver unit 5. As a result, the panel type speaker device 1
can adjust the frequency band and the amplitude at which resonance occurs in the high
frequency band, and by combining the characteristics of the low frequency band and the middle
frequency band, the frequency response characteristic in the high frequency band can be
obtained. It is possible to take more widely.
[0041]
In addition, in order to improve the frequency response characteristic in the high frequency
band, the panel type speaker device 1 is configured, for example, by all or part of the mirror plate
4 to which the driver unit 5 is fixed by a mounting plate made of different materials. You may
For example, when the mirror plate 4 is molded of a synthetic resin, the mounting plate is
integrated by an insert molding method, and a material of a material that improves the response
characteristic to a specific input frequency is selected. Therefore, the panel-type speaker device 1
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mechanically has the same function as a so-called two-way speaker device because the vibration
characteristics are different between the mirror plate 4 and the mounting plate.
[0042]
The panel-type speaker device 1 may be configured by providing the mirror plate 4 with a mass
component material formed of a material that easily absorbs vibration. The mass component
material is made of, for example, a tape-shaped lead material, and is adhered to the mirror plate
4 over the entire periphery of the outer peripheral portion 4c of the sound emitting surface 4a.
As described above, the panel-type speaker device 1 makes the outer peripheral portion 4c
unconstrained by the mirror plate 4 so that vibration is easily generated in the outer peripheral
portion 4c even in the low frequency band. It is configured to be able to obtain a stable
reproduction output. In the panel type speaker device 1, a mass component material is provided
on the outer peripheral portion 4c to lower the generation frequency of the vibration mode in the
low frequency band, thereby extending the reproduction effective frequency band. The mass
component material is not limited to the above-described tape-like lead material, and it is a
matter of course that it may be formed of another material having a large vibration loss or a
material having a large anti-vibration drop.
[0043]
By the way, in the panel type speaker device 1 described above, the mirror plate 4 is configured
to be driven by one driver unit 5, but the present invention is not limited to such a configuration,
and a large number of driver units Of course, it may be configured to drive the mirror plate 4.
With this configuration, the mirror plate 4 is driven by a large number of driver units with a
vibration area of a large area by this configuration, so that the sensitivity in the low frequency
band can be improved. A lower operating frequency is ensured.
[0044]
The panel-type speaker device 20 shown in FIG. 6 as a second embodiment of the present
invention includes three driver units 21 a to 21 c for driving the mirror plate 4. In the following
description, a plurality of members and portions are first described in this way, but in the
following description, they will be collectively referred to as the driver unit 21 unless otherwise
specifically described. Each driver unit 21 is the same as the driver unit 5 of the panel type
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speaker device 1 described above, and thus the description thereof is omitted. The panel-type
speaker device 20 is characterized in the configuration of the input unit 22 on the side of the
navigation device main body 3 which supplies the reproduction input signal to each driver unit
21. That is, the panel-type speaker device 20 is configured to drive each of the driver units 21
independently by supplying the reproduction input signal or switching the phase, etc. via the
input unit 22.
[0045]
The input unit 22 includes an amplifier 24 for amplifying the reproduction input signal supplied
from the audio output unit 23, and switches 25a to 25c and a volume which are respectively
independently connected between the amplifier 24 and each driver unit 21. 26a to 26c and a
series circuit. Each changeover switch 25 performs switching operation of the phase of the
reproduction input signal in the input ON state together with switching operation of ON / OFF of
the input of the reproduction input signal to each driver unit 5, for example. Each volume 26
adjusts the level of the reproduction input signal inputted to each driver unit 5 so as to adjust the
sensitivity of each driver unit 5 individually.
[0046]
The reproduction input signal having the required phase component is supplied from the input
unit 22 to the panel-type speaker device 20 configured as described above through the audio
output unit 23. In the panel-type speaker device 20, each driver unit 21 is operated
independently to drive the mirror plate 4 to emit a reproduction output such as a voice guide or
a warning. Therefore, the panel-type speaker device 20 makes it possible to obtain a
reproduction output in which the sound field, the sound quality, and the like are appropriately
changed by eliminating the need for special circuit elements, switching devices, and the like and
extremely easy operation by the user.
[0047]
The panel type speaker device 30 shown in FIG. 7 as the third embodiment of the present
invention includes three driver units 31a to 31c for driving the mirror plate 4 in the same
manner as the panel type speaker device 20 described above. The present invention is
characterized in the configuration of the input unit 32 which supplies the reproduction input
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signal to each of the driver units 31. That is, the panel-type speaker device system 30 divides the
reproduction input signal into three frequency bands in the input unit 32 and performs phase
adjustment and combines them, and supplies the mirror plate 4 to each driver unit 31. It is
configured to drive.
[0048]
The input unit 32 includes bandpass filters 34a to 34c to which reproduction input signals are
supplied from the audio output unit 33, changeover switch units 35 to 37 connected to the
bandpass filters 34, and the changeover switch units 35 to 37, respectively. , And amplifiers 39a
to 39c and the like interposed between the mixers 38 and the driver units 31, respectively. The
band pass filter 34 divides the reproduction input signal supplied from the computer main body
33 into predetermined frequency bands.
[0049]
Each of the changeover switch units 35 to 37 is constituted by three changeover switches 35a to
35c, 36a to 36c, and 37a to 37c connected to the mixer 38, respectively. These changeover
switches 35a to 35c, 36a to 36c, and 37a to 37c, for example, switch on / off of the input of the
reproduction input signal to each mixer 38, as well as switching the phase of the reproduction
input signal in the input on state. Do. Each mixer 38 synthesizes the reproduction input signal of
a predetermined frequency band supplied from each of the changeover switch units 35 to 37 and
inputs it to each amplifier 39. Each amplifier 39 amplifies the combined reproduction input
signal and supplies it to the driver unit 31.
[0050]
With the panel-type speaker device 30 configured as described above, the reproduction input
signal supplied from the audio output unit 33 is divided into three frequency bands in the input
unit 32 and the required phase components are obtained. Adjusted and input. In the panel-type
speaker device 30, each driver unit 31 is operated independently to drive the mirror plate 4 to
emit reproduction sound. In the panel type speaker device 30, for example, the reproduction
input signal of the in-phase component is all supplied to each driver unit 31 in the low frequency
band and the reproduction input signal of the reverse phase component is supplied in the middle
frequency band and the high frequency band. Configure. Specifically, in the medium- and high-
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frequency bands of the panel-type speaker device 30, for example, reproduction input signals of
positive-phase components are input to the upper and lower driver units 31a and 31c, and to the
driver unit 31b in the central portion. The reproduction input signal of the negative phase
component is input.
[0051]
In the panel-type speaker device 30, a large bending operation occurs in the mirror plate 4 when
the reproduction input signal of the in-phase component is supplied to each driver unit 31 in the
low frequency band. Therefore, as in the case where the mass component material is attached to
the outer peripheral portion 4c of the mirror plate 4 as described above, the panel type speaker
device 30 generates a peak in a low frequency band to improve response characteristics, ie,
sensitivity. It will be improved. In addition, the panel type speaker device 30 supplies the
reproduction input signals of opposite phase components in the middle frequency band and the
high frequency band to the respective driver units 31, so that frequency bands which are
mutually offset are generated and the overall sensitivity is lowered. As a result, the reproduced
output whose sensitivity has been flattened as a whole is output.
[0052]
As described above, the panel type speaker device 30 causes a large bending operation to occur
in the mirror plate 4 by inputting the reproduction input signal of the reverse phase component
to the driver unit 31b at the central portion. The playback sound will be output. Therefore, the
panel type speaker device 30 can perform reverse phase input to the driver unit 31b by
switching operation of the switch units 35 to 37 of the input unit 32 in a specific frequency
band, and can generate unique reproduction sound. .
[0053]
The panel-type speaker device 40 shown in FIG. 8 as the fourth embodiment of the present
invention has three, for example, in order to flatten the frequency response characteristic by
suppressing the occurrence of the dip portion and the excessive peak described above. The
digital filters 44a to 44c are provided. That is, the panel-type speaker device 40 has three driver
units 41 a to 41 c that drive the mirror plate 4 in the same manner as the panel-type speaker
device 30 described above, and inputs for supplying reproduction input signals to these driver
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units 41. And a section 42. The input unit 42 includes three filters 44a to 44c that perform
appropriate signal processing on the reproduction input signal supplied from the audio output
unit 43, and the reproduction input signal that has passed through each of the filters 44 for each
driver. It is comprised from the amplifiers 45a-45c which drive the unit 41, respectively.
[0054]
In the panel-type speaker device 40, the reproduction input signal supplied from the audio
output unit 43 is, for example, a specific frequency band that causes the dip portion and the
excessive peak described above to be generated by the respective filters 44 having inverse filter
function of impulse response. The signal processing such as separation is performed, and the
signal is supplied to each driver unit 41 through the amplifier 45. As a result, the panel type
speaker device 40 emits the reproduced output whose flattening of the reproduction frequency
characteristic is achieved. The panel-type speaker device 40 can also emit the reproduction
output in which only a specific frequency band is emphasized by selecting each filter 44 as
appropriate. Further, as each filter 44, an appropriate digital filter or analog filter is used, which
performs not only separation processing of a specific frequency band but also appropriate signal
processing such as amplitude and phase on the reproduction input signal. .
[0055]
In the panel type speaker device 40, an appropriate delay component is added to each filter
coefficient for each filter 44 which performs signal processing and supplies reproduction input
signals to each driver unit 41 to drive them. You may do it. With this configuration, the sound
wave wavefront of the reproduction output emitted from the mirror plate 4 is controlled and the
main axis of the panel type speaker device 40 can be appropriately shifted from the front, so that
the sound can be enhanced.
[0056]
Further, in the panel-type speaker device 40, predetermined amplitude processing is applied to
each filter coefficient for each filter 44 which performs predetermined signal processing and
supplies reproduction input signals to each driver unit 41 and drives these. It may be configured.
By adopting such a configuration, the panel-type speaker device 40 can provide directivity in the
same manner as the speaker array. Therefore, although the panel type speaker apparatus 40 is
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comprised by the mirror plate 4 of 1 sheet of sound emission parts, it comprises the speaker
apparatus which can control directivity also with respect to several input sound sources.
[0057]
The panel type speaker apparatus 50 shown in FIG. 9 as the fifth embodiment of the present
invention is a development in which the input section 52 is provided with the filter 55 for
obtaining the desired optimum characteristics based on the panel type speaker apparatus 40
described above. An example is shown. The panel type speaker device 50 also includes three
driver units 51a to 51c for driving the mirror plate 4 and an input unit 52 for supplying a
reproduction input signal to each of the driver units 51. The input unit 52 includes a first
amplifier 54 to which reproduction input signals are supplied from the audio output unit 53, a
filter 55, and a second amplifier 56 connected to the filter 55.
[0058]
In the panel-type speaker device 50, the first driver unit 51a and the third driver unit 51c
arranged above and below are driven by the reproduction input signal supplied via the first
amplifier 54 of the input unit 52. The panel-type speaker device 50 is a second speaker-type
speaker device disposed in the center by supplying the reproduction input signal subjected to
predetermined signal processing by the filter 55 of the input unit 52 through the second
amplifier 56. The driver unit 51b is driven. The panel-type speaker device 50 controls the
vibration mode generated in the mirror plate 4 by supplying the reproduction input signal
subjected to the predetermined signal processing to the second driver unit 51b.
[0059]
The panel-type speaker device 50 drives the second driver unit 51b with different phases with
respect to the first driver unit 51a and the third driver unit 51c, for example, by performing
reverse phase processing of the reproduction input signal in the filter 55. To do. With this
configuration, the panel-type speaker device 50 can drive the mirror plate 4 in a vibration mode
that can not be predicted by ordinary material analysis, and as a result, the occurrence of the
above-described dip portion and excessive peak is suppressed.
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[0060]
In the panel type speaker device, by supplying the reproduction input signals of opposite phases
to each other and driving them to the driver unit disposed at the geometrically symmetrical
position on the diaphragm, the diaphragm material is made in a specific frequency band.
Regardless of this, it becomes possible to forcibly generate vibration nodes at equally spaced
positions of these driver units. Therefore, in the panel-type speaker device, the sensitivity
adjustment of each frequency band, the improvement of the reproduction frequency
characteristic, the adjustment of the sound field and the sound quality, and the like become
possible by skillfully utilizing such a phenomenon. Of course, signal processing of the
reproduction input signal may be performed by appropriately combining filters for each driver
unit.
[0061]
The panel-type speaker device 60 shown in FIG. 10 as the sixth embodiment of the present
invention includes the mirror plate 4, five drive units 61a to 61e, and reproduction input signals
supplied from the audio output units 63a and 63b. It comprises the input part 62 which
processes and inputs to each drive unit 61. Of course, the panel-type speaker device 60 may be
configured to drive one mirror plate 4 with three drive units, similarly to the above-described
panel-type speaker devices.
[0062]
The input unit 62 is provided with first delay component supply circuits 64a1 to 64a4 and a
second delay component supply circuit 64 for sequentially adding large delay components da1,
da2, da3, da4 to the reproduction input signal supplied from the first audio output unit 63a.
Second delay component supply circuits 64b1 to 64b4 are provided to sequentially add large
delay components db1, db2, db3, db4 to the reproduction input signal supplied from the audio
output unit 63b. The input unit 62 is supplied with the first mixer 65a to the fifth mixer 65e and
the reproduction input signal mixed in these mixers 65, and the first amplifiers 66a to 66d drive
the respective driver units 61. 5 amps 66e are provided.
[0063]
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The first mixer 65a mixes the reproduction input signal supplied from the first audio output unit
63a with the reproduction input signal supplied from the second audio output unit 63b and to
which the delay component db4 is added. The second mixer 65b is supplied from the first audio
output unit 63a and supplied with the delay component da1 and supplied from the second audio
output unit 63b and supplied with the delay component db3. And mix. The third mixer 65c is
supplied from the first audio output unit 63a and supplied with the delay component da2 and
supplied from the second audio output unit 63b and supplied with the delay component db2 And
mix. The fourth mixer 65d is supplied from the first audio output unit 63a and provided with the
delay component da3 and supplied from the second audio output unit 63b and provided with the
delayed component db1. And mix. Furthermore, the fifth mixer 65e mixes the reproduction input
signal supplied from the first audio output unit 63a and to which the delay component da4 is
added and the reproduction input signal supplied from the second audio output unit 63b.
[0064]
In the panel-type speaker device 60, the reproduction input signal supplied from the first audio
output unit 63a and the second audio output unit 63b is subjected to signal processing in which
the weight of the delay component is changed to obtain each driver unit 61. Supplied to
Therefore, in panel type speaker device 60, drive is gradually performed from first driver unit
61a to fifth driver unit 61e in accordance with delay component d based on the reproduction
input signal of first audio output portion 63a. To be done. Further, in the panel type speaker
device 60, based on the reproduction input signal of the second audio output unit 63b, the drive
is gradually driven toward the fifth driver unit 61e and the first driver unit 61a according to the
delay component d. To be done.
[0065]
In the panel-type speaker device 60, the reproduction output based on the reproduction input
signal of the first sound output unit 63a is emitted from the sound emission surface 4a of the
mirror plate 4 in the direction indicated by the arrow AA in FIG. Ru. Further, in the panel type
speaker device 60, the reproduction output based on the reproduction input signal of the second
audio output unit 63b is emitted from the sound emission surface 4a of the mirror plate 4 in the
direction shown by BB in FIG. Therefore, in the panel type speaker device 60, directivity different
from each other is given to the audio output units of two channels.
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[0066]
The panel-type speaker device 70 shown in FIG. 11 as the seventh embodiment of the present
invention drives the mirror plate 4 by the five drive units 71a to 71e and, at the same time,
reproduces input signals from the two audio output units 73a and 73b. Is the same as the paneltype speaker device 60 described above with regard to the configuration for supplying. Of
course, as with the panel-type speaker devices described above, the panel-type speaker device 70
may also be configured to drive the mirror plate 4 with three drive units.
[0067]
That is, to the input unit 72, five first filters 74a1 to 74a5 for processing the reproduction input
signal supplied from the first audio output unit 73a, and the reproduction supplied from the
second audio output unit 73b Ten filters 74 comprising five second filters 74b1 to 74b5 for
signal processing the input signal are provided. The input unit 73 also includes five mixers 75a
for mixing the reproduction input signal supplied from the first audio output unit 73a subjected
to the signal processing and the reproduction input signal supplied from the second audio output
unit 73b. To 75e, and five amplifiers 76a to 76e for driving the respective driver units 71 by
inputting reproduction input signals respectively mixed in the mixers 75.
[0068]
The first mixer 75a is supplied from the first audio output unit 73a and subjected to the signal
processing on the first filter 74a1, and supplied from the second audio output unit 73b to the
fifth filter 74b5. The reproduction input signal subjected to the signal processing is input, these
are channel synthesized and supplied to the first amplifier 76a. The second mixer 75b is supplied
from the first audio output unit 73a and subjected to the signal processing on the second filter
74a2, and supplied from the second audio output unit 73b to the fourth filter 74b4. The
reproduction input signal subjected to the signal processing is input, these are channel
synthesized and supplied to the second amplifier 76b. The third mixer 75c is supplied from the
first audio output unit 73a and subjected to the signal processing on the third filter 74a3, and
supplied from the second audio output unit 74b to the third filter 74b3. The reproduction input
signal subjected to the signal processing is input, these are channel synthesized and supplied to
the third amplifier 76c.
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[0069]
Further, the fourth mixer 75d is supplied from the first audio output unit 73a and subjected to
the signal processing in the fourth filter 74a4, and supplied from the second audio output unit
73b to be the second filter. At 74 b 2, the reproduction input signal subjected to signal
processing is input, these are channel synthesized and supplied to the fourth amplifier 76 d. The
fifth mixer 75e is supplied from the first audio output unit 73a and subjected to the signal
processing in the fifth filter 74a5, and is supplied from the second audio output unit 73b to the
first filter. At 74 b 1, the reproduction input signal subjected to signal processing is input, these
are channel synthesized and supplied to the fifth amplifier 76 e.
[0070]
In each of the filters 74a and 74b, as in the case of the filter 44 used for the panel type speaker
device 40 described above, for example, selection of a predetermined frequency band and an
arbitrary phase for the reproduction input signal input to each of the filters 74a and 74b. Or
what has a filter factor which performs signal processing of an amplitude is used. The panel type
speaker device 70 can obtain more effective directional characteristics as compared to the abovedescribed panel type speaker device 60 by using the optimum filters 74 a and 74 b.
[0071]
Further, in the panel type speaker device 70, control of a specific frequency band may be
performed on the reproduction input signal supplied to each driver unit 71 which drives the
mirror plate 4 by the filters 74a and 74b. This enables the panel-type speaker device 70 to
generate a vibration mode having a large number of antinodes and nodes in the mirror plate 4,
and each antinode of the vibration mode is regarded as a sound source. In a speaker array, it is
generally necessary to increase the number of sound sources in order to obtain the effect of
narrowing the directivity to a high frequency band, which increases the cost, increases the size of
the device, and gives the user a sense of oppression. There is. As described above, the panel-type
speaker device 70 can obtain the target narrow directivity by the smaller number of driver units
71, and since the sound emission surface is also one sound emission surface 4ak of the mirror
plate 4, it has a small size. It is inexpensive and solves the problems described above. It is
needless to say that the improvement of the narrow directivity in the panel type speaker device
70 can be achieved by each of the panel type speaker devices described above.
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[0072]
Furthermore, in the panel-type speaker device 70, for example, the directional characteristics
may be changed by providing each of the filters 74a and 74b with a control unit that controls the
filter coefficients to be updated over time. By adopting such a configuration, the panel-type
speaker device 70 can generate special acoustic effects such as rotation and movement of the
sound emission axis without using a special mechanical configuration. Of course, such a
configuration can also be adopted for each of the panel type speaker devices described above.
[0073]
In the present invention, the individual techniques described in the above-described
embodiments may be appropriately combined, and these may be electrically or mechanically
switched to drive the diaphragm. The panel type speaker apparatus drives the mirror plate 4 by a
large number of driver units as shown in the panel type speaker apparatus 20 of the second
embodiment to the panel type speaker apparatus 70 of the seventh embodiment described
above. By configuring as above, reproduction output with excellent sound quality and volume is
enabled from low frequency band to high frequency band as well as directivity characteristics.
Therefore, the panel-type speaker device can be sufficiently used not only as a speaker device of
a navigation device but also as a mounted radio receiver and a speaker device of a car stereo.
[0074]
Moreover, in each embodiment mentioned above, although the case where a panel type speaker
apparatus was combined as a rearview mirror apparatus, such as a passenger car, was shown, for
example, using an end plate, such as a look-alike placed in each room etc., as a diaphragm. Of
course, a new speaker device may be configured by The panel-type speaker device constructs a
speaker system without taking a place in the room and without damaging the atmosphere.
[0075]
As described above in detail, according to the panel-type speaker device of the present invention,
a diaphragm which is driven by the driver unit based on the supplied reproduction input signal
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and emits a reproduction output is an end plate Because of its small size and thinness, a large
speaker box can be installed as in the prior art to construct a novel speaker system that does not
impair the atmosphere in a room or the like. The panel type speaker device can be installed in a
limited car without taking a place by configuring a speaker device such as a navigation system
mounted as a diaphragm with an end plate of a rearview mirror device for automobiles in
particular. The sound guide and the alarm sound are informed with a sufficient sound volume
and a good sound quality to the driver as well as a passenger with a sufficient sound volume and
a good sound quality without being masked by the engine sound and the traveling sound.
[0076]
Brief description of the drawings
[0077]
1 is a perspective view of a state of use in which the panel type speaker device shown as the first
embodiment of the present invention is applied to a rearview mirror device as a speaker device
of a navigation device.
[0078]
2 is a longitudinal sectional view of an essential part of the same panel type speaker device.
[0079]
3 is a longitudinal sectional view of an essential part of the same panel type speaker device.
[0080]
4 is a diagram for explaining the state of the vibration mode of the mirror plate constituting the
diaphragm of the panel type speaker device.
[0081]
5 is a measurement diagram of directivity characteristics according to the input frequency of the
panel type speaker device.
[0082]
<Figure 6> The principal part block diagram of the panel type speaker device which drives the
mirror board which shows as 2nd execution form of this invention by 3 driver units.
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[0083]
<Figure 7> The principal part block diagram of the other panel type speaker device which drives
the mirror board which shows as the 3rd execution form of this invention with 3 driver units.
[0084]
<Figure 8> The principal part block diagram of the other panel type speaker device which drives
the mirror board which shows as the 4th execution form of this invention by 3 driver units.
[0085]
FIG. 9 is a block diagram of an essential part of another panel-type speaker device in which a
mirror plate shown as a fifth embodiment of the present invention is driven by three driver units.
[0086]
<Figure 10> The principal part block diagram of the panel type speaker device which drives the
mirror board which shows as the 6th execution form of this invention by 5 driver units.
[0087]
<Figure 11> The principal part block diagram of the other panel type speaker device which
drives the diaphragm which is shown as the form of 7th execution of this invention with 5 driver
units.
[0088]
Explanation of sign
[0089]
Reference Signs List 1 panel type speaker device (back mirror device), 2 console box, 3
navigation device main body, 4 mirror plate, 4 a mirror surface (sound emitting surface), 4 b
driven surface, 4 c outer peripheral portion, 5 driver unit, 6 mirror cover, 7 Transparent
substrate, 8 reflective layers, 9 voice coils, 10 magnetic circuits, 11 bobbins, 12 coils, 13 center
poles, 14 magnets, 15 plates, 16 dampers
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