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JP2017530631

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2017530631
Here, the panel has a long side and a short side, and a plurality of excitation positions on the
panel so as to generate a wave having a wavefront substantially perpendicular to the long side
and propagating toward the short side. Disclosed is a loudspeaker assembly and acoustic device
comprising at least one transducer configured to excite a panel and optionally at least one
attenuator mounted on the panel. In addition, a method of sound generation is also disclosed.
Thin Panel Loudspeakers Cross Reference to Related Applications
[0001]
This application claims the benefit of priority of US Provisional Patent Application No. 62 /
052,778, filed September 19, 2014, the contents of which are incorporated herein by reference
in its entirety.
[0002]
Disclosed herein are thin panel speakers and acoustic devices, in particular, glass panel
loudspeakers that generate bending waves having a substantially straight wavefront.
[0003]
Thin panel speakers may be used to emit sound by the propagation of bending waves in the
panel by one or more transducers.
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Such distributed vibration mode loudspeakers (DMLs) have various advantages such as the
ability to generate high sound pressure levels (SPLs) with relatively small local displacements of
the panel due to the increased panel surface area as compared to conventional speakers It can
have
Accordingly, panel speakers can be used in various advanced technologies, such as, for example,
photographic frames that emit sound, as the transducers or transducers used to generate the
bending waves can be made smaller and the entire speaker apparatus can be thinned.
[0004]
Like other panel loudspeakers, such as electrostatic or planar magnetic loudspeakers, DML
produces a deep sound field and a large "sweet spot" (eg, the area where the best sound can be
obtained in the listening room) It can. However, the performance of DML in terms of sound
quality can have many drawbacks such as non-flat frequency, random phase response, rapid
change of frequency response due to direction (listening position), and / or long sound decay
time . These drawbacks can be attributed to one or more basic design features. For example,
since it takes a finite time for the bending wave to propagate from the excitation point (vibrator /
converter attachment point) to the panel edge in the panel, the rapid transients in the sound
waveform can be time-stretched . This stretching may also be frequency dependent, since the
faster the higher frequency the higher frequency the bending wave may be highly dispersed.
Furthermore, the reflection from the panel edge can lead to a clear resonance formation in the
frequency response, which can correspond to the mechanical mode of the panel. Finally, if the
damping or wave attenuation in the panel material is not high enough, the reflections at the edge
will be "ringing" (duration of the standing wave and the sound emitted by the standing wave after
stopping the excitation) Can also cause.
[0005]
In an attempt to improve the various weaknesses as described above, DML has been developed
that uses only advancing bending waves. For example, the reflection at the edge can be passively
suppressed by introducing a precisely cut incision at the edge of the rectangular panel or by
using a star diffuser at the outer edge of the circular panel. These designs allow for the provision
of a flatter frequency and / or smoother phase response and / or distortion of abrupt transients
such as ringing and / or limiting of mode resonance. However, these approaches can be difficult
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to implement in the case of thin glass panels and / or rectangular panels (eg, bars having short
and long sides). Opening precise slots in the glass is complex, time consuming and can
compromise the reliability of the panel. Furthermore, in the case of small rectangular panels,
there may not be enough space along the short sides for a properly designed star or sawtooth
diffuser. In addition, cuts and / or star diffusers can compromise the aesthetic appearance of
glass panels, such as transparent glass panels.
[0006]
Thus, it would be advantageous to provide an exemplary glass loudspeaker that does not have
the disadvantages associated with conventional DML. It would also be advantageous to provide a
glass speaker that can enjoy the benefits of a non-resonance design while maintaining aesthetic
display.
[0007]
The present disclosure, in various embodiments, generates a panel having a long side and a first
short side, and a first wave having a wavefront substantially perpendicular to the long side and
propagating toward the first short side. And at least one first transducer configured to excite the
panel at a first plurality of excitation locations on the panel, and mounted to the panel and
configured to attenuate wave energy And a speaker assembly comprising at least one attenuator.
[0008]
Furthermore, here it is arranged approximately in a row on the panel so as to generate a panel
having a short side and a long side, and a wave connected to the panel and having a substantially
linear wavefront propagating towards the short side Also disclosed is an acoustic device
comprising at least one transducer configured to excite a panel at a plurality of excitation
positions.
The method comprises exciting the panel at a plurality of positions with one or more transducers
so as to generate a wave having a wavefront substantially perpendicular to the long side of the
panel and propagating towards the short side of the panel And optionally, damping the wave
energy using at least one attenuating portion mounted on the short side of the panel.
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[0009]
According to various embodiments, the panel may be a glass panel, selected from single sheet
glass, multiple glass sheets stacked together, glass and glass laminate structures, and glass and
polymer laminate structures It can. In addition, the panels may be honeycomb panels designed
with other materials such as metal, plastic, wood, paper, and designed materials such as
laminated materials such as plywood and composites of laminated glass and plastic. May be
included in addition to In another embodiment, the at least one transducer may be a single linear
transducer mounted on the panel, and a plurality of transducers mounted on the panel at a
plurality of excitation positions, It is also good.
[0010]
In one embodiment, the first plurality of excitation positions may be arranged substantially in a
first row. In a further embodiment, the panel may include a second short side, and the plurality of
excitation positions may be arranged in a row adjacent to the second short side. According to a
further aspect, the plurality of excitation positions may be arranged in a row substantially
parallel to the second short side and may be located between the first short side and the second
short side. In still another embodiment, the speaker assembly is arranged in a first plurality of
excitation positions arranged substantially in a row adjacent to the second short side, and
arranged substantially in a row adjacent to the first short side. A second plurality of excitation
positions may be included. In a further non-limiting embodiment, the damping part may be
adjacent to the first or second short side or may be located between the first short side and the
second short side .
[0011]
Additional features and advantages are set forth in the following detailed description and, in part,
will be readily apparent to those skilled in the art from the description, or in addition to the
attached drawings, the following details: It will be understood by practice of the methods
described herein, including the description and the claims.
[0012]
It is understood that both the foregoing general description and the following detailed
description are intended to present various embodiments of the present disclosure and to
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provide an overview or framework for understanding the nature and features of the claims. It
should be.
The accompanying drawings are included for further understanding, and are incorporated in and
constitute a part of this specification. The drawings illustrate various non-limiting embodiments
and, together with the description, serve to explain the principles and operations of the present
disclosure.
[0013]
The various features, aspects, and advantages of the present disclosure will be better understood
upon reading the following detailed description, with reference made to the accompanying
drawings in which similar configurations are indicated as similar as possible through reference
numerals. is there.
[0014]
FIG. 7 is a top view of an exemplary speaker assembly according to aspects of the present
disclosure.
FIG. 6 is a top view of an exemplary speaker assembly according to a further aspect of the
present disclosure. FIG. 16 is a top view of an example speaker assembly according to various
aspects of the present disclosure. FIG. 6 is a top view of an exemplary speaker assembly
according to a further aspect of the present disclosure. FIG. 10 is a side view of an exemplary
speaker assembly according to aspects of the present disclosure. FIG. 7 is a side view of an
exemplary speaker assembly according to a further aspect of the present disclosure. FIG. 16 is a
side view of an exemplary speaker assembly in accordance with various aspects of the present
disclosure. FIG. 7 is a side view of an exemplary speaker assembly according to a further aspect
of the present disclosure. It is a graph which shows the vibration impulse response of the
example speaker which does not comprise an attenuation part. 5 is a corresponding wavelet map
for the example speaker of FIG. 4A. 5 is a graph illustrating a vibrational impulse response of a
speaker assembly according to aspects of the present disclosure. FIG. 5B is a corresponding
wavelet map for the speaker assembly of FIG. 5A. 7 is a graph illustrating a comparison of
frequency responses of exemplary speaker assemblies in accordance with aspects of the present
disclosure. 7 is a graph illustrating a comparison of normalized frequency responses of
exemplary speaker assemblies in accordance with aspects of the present disclosure.
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[0015]
Here, a plurality of excitation positions on the panel so as to generate a panel having a long side
and a first short side, and a wave having a wavefront approximately perpendicular to the long
side and propagating toward the first short side A speaker assembly comprising at least one
transducer configured to excite the panel and at least one attenuator mounted to the panel and
configured to attenuate wave energy.
[0016]
Furthermore, here it is arranged approximately in a row on the panel so as to generate a panel
having a short side and a long side and a wave connected to the panel and having a substantially
linear wavefront propagating towards the short side. Also disclosed is an acoustic device
comprising at least one transducer configured to excite the panel at a plurality of excitation
positions, and further, a method of acoustic generation is disclosed herein.
The method comprises exciting the panel at a plurality of positions with one or more transducers
so as to generate a wave having a wavefront substantially perpendicular to the long side of the
panel and propagating towards the short side of the panel And optionally, damping the wave
energy using at least one attenuating portion mounted on the short side of the panel.
[0017]
It is understood that the following detailed description, and the various embodiments described
herein, are equally applicable to the disclosed and claimed speaker assemblies, acoustic devices
and methods herein, without being limited and combined. It should.
[0018]
1A, 1 B and 2 A, 2 B show top views of a speaker assembly according to various non-limiting
aspects of the present disclosure.
The loudspeaker may comprise a panel 100 having two short sides 105, 110 and two long sides
115, 120. Here, the short side and the long side are interchangeably referred to as the first and
second short sides, and the first and second long sides, respectively, and their orientations are
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unless explicitly stated otherwise It should be understood that it is not limited. Furthermore,
although the two short sides 105, 110 and the two long sides 115, 120 are shown in a generally
planar shape, this should not limit the scope of the claims attached hereto. This is because it can
be considered that any one or several long and / or short sides may be non-planar.
[0019]
For example, in other embodiments, each short side may be flat as shown, but the long sides 115,
120 may be non-planar, such as curved surfaces, and the opposing portions of the frame 135 It
may also be non-planar or curved. Or it may be the opposite. In a non-limiting embodiment, the
panel surface may be concave or convex, for example, in the case of a panel formed to fit a
speaker having a curved TV screen or non-planar surface. Thus, an exemplary panel having a
concave surface may have a convex shape on one long side 115 (FIG. 1A, FIG. 1B) or two long
sides 115, 120 (FIG. 2A, FIG. 2B) and opposite portions of the frame 135. It may include
opposing surfaces. Of course, the opposing portions may also be concave, with the corresponding
long sides (or long sides) being concave, to provide the hyperboloid cross section of an
exemplary embodiment. Furthermore, the panel surface may be convex in a convex or concave
state in which the opposing frame portions are opposed. Thus, the distribution of sound waves
from the exemplary surface may also be suitably controlled.
[0020]
The plurality of excitation positions 125 may be arranged in substantially a line on the panel
100, even though at least one transducer (not shown) is configured to excite the panel at the
plurality of excitation positions 125. Good. For example, the excitation position may correspond
to one or more transducers mounted, attached or coupled to the panel 100 at multiple excitation
positions, or in other embodiments a single linear Transducers may be used to excite the panel at
multiple excitation positions 125. In various embodiments, the speaker may further comprise an
attenuator 130 configured to attenuate wave energy, eg, absorb, diffuse or relax, optionally
around at least a portion of the panel 100 You may provide the flame | frame 135 to extend |
stretch.
[0021]
Although FIGS. 1A, 1 B show a horizontal speaker orientation, it should be understood that the
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speaker may be used in any other orientation, such as vertical. Furthermore, as shown in FIGS.
2A, 2B, a speaker assembly according to aspects of the present disclosure may be provided with
more than one speaker configuration, for example to make a stereo system. For example, in one
embodiment, the stereo design shown in FIG. 2A exhibits slightly better stereo separation than
the design in FIG. 2B, while the design in FIG. 2B represents a more modern aesthetic design sell.
Although not shown, the speaker assembly may also include a third center channel speaker
between the two speaker configurations, the third speaker also including a panel or using a
conventional cone driver .
[0022]
An array of approximately one row of excitation positions produces a wave on the panel with a
substantially linear or linear wavefront, whether excited by a single linear transducer or by an
array of transducer arrayed in a substantially linear array It can. A linear wavefront may
propagate towards one or more short sides of the speaker panel with minimal reflection at the
long sides of the panel. In a non-limiting embodiment, a "cylindrical" shape in which the wave
propagates mostly in one row towards the short side of the panel, with only a small portion of
the wave energy reflecting at the long side of the panel It can be considered to have Thus, in
some aspects of the present disclosure, reflections at the long side of the panel may not be
suppressed, for example using one or more absorbers or diffusers. In these non-limiting
embodiments, as shown in FIGS. 1A, 1B and 2A, 2B, for example, a single damping part is placed
and integrated into a panel, and the wave energy to propagate is It may be configured to absorb
or diffuse only in the direction of the short side of the panel.
[0023]
On the other hand, conventional speakers with single point transducers can generate circular
waves towards all sides of the panel, so it is necessary to suppress reflections at all sides of the
panel to minimize mode behavior There is. Such conventional designs may be configured to
utilize only traveling bending waves as opposed to standing bending waves. In order to avoid the
formation of standing bending waves and mode resonances, these conventional devices can be
configured to reduce or suppress the reflection of bending waves on all four sides of the panel.
Thus, whatever material is used to support the panel edge, it should not only match the
mechanical impedance of the panel, but also diffuse or absorb bending wave energy. However, in
most cases the dimensions of the support may be significantly smaller than the wavelength of the
bending wave to be absorbed.
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[0024]
For example, for an exemplary non-limiting panel speaker employing 0.55 mm thick Corning®
Gorilla® glass, the wavelength of the bending wave as a function of frequency is given in Table I
below It is shown.
[0025]
[0026]
For absorbers or diffusers, the minimum length for the attenuator is at least about 5 cm,
assuming that it is desirable to have a quarter wavelength length and still be low at least to a
frequency of 150 Hz and to suppress reflections. It can be calculated.
Thus, conventional speakers configured to suppress reflection of bending waves on all four sides
of the panel may be limited in size, for example, smaller sizes may not function properly.
In particular, in the case of a rectangular panel, for example a bar speaker, the short side of the
bar will probably have a length greater than 10 cm to generate some sound, and to generate the
sound efficiently That double length (eg, about 20 cm) may be necessary.
[0027]
The loudspeaker and acoustic device disclosed herein may comprise a thin panel, for example,
the panel may be about 0.3 mm to about 2.5 mm, about 0.3 mm to about 2 mm, about 0.5 mm to
about 1 It may have a thickness in the range of about 0.1 mm to about 3 mm, such as about .5
mm, or about 0.7 mm to about 1.1 mm, and including a partial range therebetween. In some
embodiments, the panel may have a generally rectangular (eg, bar) shape. In such an
embodiment, the panel may comprise two short sides and two long sides. However, it should be
understood that the panels are not limited to rectangular shapes, but may be any other suitable
shape. For example, according to various aspects of the present disclosure, the two long sides
may be approximately equal in length or may have different lengths. Similarly, the two short
sides may be approximately equal in length or may have different lengths. In various non-limiting
embodiments, the long side (or sides) of the panel ranges from about 30 cm to about 150 cm, or
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all about 20 cm to about 200 cm, such as about 50 cm to about 100 cm, and , And may have
dimensions in a range including a partial range therebetween. The short side of the panel (or
short sides of the panel) covers the entire range of about 5 cm to about 25 cm, such as about 8
cm to about 20 cm, or about 10 cm to about 15 cm, and partial ranges between them. You may
have the dimension of the included range.
[0028]
The panel is a honeycomb panel designed with any suitable material including glass, metal,
plastic, wood, paper, and designed materials such as laminate materials such as plywood and
composites of glass and plastic, for example. And can be included. In one embodiment, the panel
comprises soda lime silicate, aluminosilicate, alkali aluminosilicate, borosilicate, alkali
borosilicate, aluminoborosilicate, alkali aluminoborosilicate, and other suitable glasses Etc. may
be included. In various embodiments, the panel may comprise transparent, opaque or colored
glass. Exemplary non-limiting glass panels include, but are not limited to, single sheet glass,
multiple glass sheets stacked together, glass and glass laminate structures, and glass and
polymer laminate structures. Absent. In various embodiments, the glass may be chemically
strengthened. Non-limiting examples of suitable commercially available substrates include EAGLE
XG®, Lotus®, Willow®, and Gorilla®, sold by Corning, to name but a few, to name but a few. )
Includes glass. Such chemically strengthened glasses are described, for example, in US Pat. No.
7,666,511, US Pat. No. 4,483,700, and US Pat. No. 5,674,790, which are incorporated herein by
reference in their entirety. It may be provided based on.
[0029]
Chemical strengthening of the glass can be performed, for example, by ion exchange. During the
ion exchange process, the ions in the glass sheet can be exchanged with larger metal ions from,
for example, a salt bath, at or near the surface of the glass sheet. The incorporation of larger ions
into the glass can strengthen the sheet by creating compressive stress in the area near the
surface. Corresponding tensile stresses can occur in the central region of the glass sheet,
commensurate with its compressive stress.
[0030]
Ion exchange may be performed, for example, by immersing the glass in a molten salt bath for a
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predetermined time. Exemplary salt baths include, but are not limited to, KNO 3, LiNO 3, NaNO 3,
RbNO 3, and combinations thereof. The temperature and processing time of the molten salt bath
can vary. Determining the time and temperature, depending on the desired application, is within
the ability of one skilled in the art. By way of non-limiting example, the temperature of the
molten salt bath ranges from about 400 <o> C to about 800 <o> C, such as from about 400 <o> C
to about 500 <o> C. Also, the predetermined time may range from about 4 hours to about 24
hours, such as about 4 hours to about 10 hours, and other temperature and time combinations
are also contemplated. By way of non-limiting example, the glass may be submerged in a KNO 3
bath, for example, at about 450 <o> C for 6 hours to obtain a K-reinforced layer that provides
surface compressive stress.
[0031]
By way of non-limiting example, the chemical strengthening treatment of Corning® Gorilla®
glass may be a relatively deep layer (eg, about 40 to 50 micrometers, or even 100 micrometers).
In the compressed state, which may be deeper than a meter, may provide relatively high
compressive stress (e.g., higher than about 500 MPa, and further higher than 800 MPa, such as
about 700 MPa to about 730 MPa). Such glasses can have high residual strength and high
scratch resistance, high impact resistance, and / or high flexural strength, in addition to a
substantially clean surface. According to various embodiments, the glass panel may have a
compressive stress higher than about 100 MPa and a depth of compressive stress layer (DOL)
deeper than about 10 micrometers. In further embodiments, the glass may have a compressive
stress greater than about 500 MPa and a DOL greater than about 20 micrometers. Alternatively,
it may have a compressive stress higher than about 700 MPa and a DOL deeper than about 40
micrometers.
[0032]
The loudspeaker or acoustic device disclosed herein may also have at least one transducer
configured to excite the panel at a plurality of excitation positions. As used herein, the terms
"transducer", "vibrator", "actuator" and variants thereof refer to the panel at one or more
excitation positions, depending on the applied electrical signal. Bending wave energy may be
applied in the form of a dispersive traveling wave, used interchangeably to refer to components
that cause the panel to vibrate and emit an acoustic output. The at least one transducer may
comprise a single linear transducer or a synchronously driven transducer array. The transducer
may be, for example, a small electronic motor, and may be attached directly to the panel and / or
frame, for example with an adhesive ("direct on" design). Alternatively, the transducers may be
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attached to the panel in another way, for example with a small spring, which may be used to
transfer the vibrational energy to the panel or frame via inertial forces. Other suitable
transducers may include, for example, piezoelectric transducers, which may be linear, or an array
in which such transducers are generally arranged in a row.
[0033]
At least one transducer may be coupled to the panel, eg, bending wave energy on the panel,
whether mounted or otherwise attached to the panel, or not attached or mounted to the panel
May be configured in other manners to apply. In the case of a single linear transducer, the
transducer may be mounted or otherwise attached to the panel at a position corresponding to a
plurality of substantially linearly arranged excitation positions. Thus, the transducer may be
configured to excite the panel at one or more of the plurality of excitation positions. In the case
of two or more transducers, such as three or more transducers, four or more transducers, each
transducer may correspond to and excite one of a plurality of excitation positions, Or, in a further
embodiment, one transducer may excite the panel at more than one excitation position. Other
transducer configurations are also conceivable and are intended to fall within the scope of the
present disclosure.
[0034]
The loudspeaker or acoustic device disclosed herein may further comprise at least one
component mounted to the panel and configured to absorb or diffuse wave energy. As used
herein, the terms "absorber", "diffuser", "attenuator", "attenuator", and variants thereof are used
to resonate the panel by absorbing and / or diffusing wave energy. Are used interchangeably to
refer to components configured to attenuate bending waves traveling through the panel, such as,
for example, diffusion or absorption, to prevent, substantially prevent, or at least soften.
[0035]
Suitable absorbing or diffusing materials may include materials that can be used to support and /
or match the panel to the panel in terms of mechanical impedance while also absorbing acoustic
wave energy at audio frequencies. However, materials meeting all these criteria may be difficult
to design or otherwise provide. Thus, it may be desirable to provide an acoustically absorbing
material having a "gradient" whose mechanical impedance changes slowly, for example, from that
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of a "free" panel to infinity (trapped edge / support). For example, pressure can be applied to the
damping part, for example by clamping with a clamp, so that the damping part increases from
the end where it initially contacts the panel to the panel edge. According to various embodiments,
the damping portion may be a polymeric foam having a continuous or closed cell structure, such
as polyurethane, polyether and polyester, to name but a few, polyvinyl chloride, leather, cloth,
paper, and liquids, to name but a few. It may contain a material selected from the base coating.
[0036]
The damping portion may provide mechanical impedance to the panel by increasing the stiffness
of at least a portion of the panel and / or by providing structural mechanical impedance to at
least a portion of the panel. In addition, the attenuator may absorb bending wave energy across
at least a portion of the panel. The damping portion may have uniform or non-uniform
mechanical impedance characteristics across at least a portion of the panel. In some
embodiments, the attenuation of bending wave energy may increase from the point at which the
attenuator first contacts the panel to the panel edge, eg, the short side of the panel. Thus, the
attenuation of the bending wave energy may be reduced at the center of the panel relative to one
or more panel edges, or vice versa, depending on the position of the attenuator.
[0037]
In various non-limiting embodiments, the damping portion 130 may include a damping material,
such as foam rubber, and is formed to have at least one "sawtooth" or jagged edge. (See, for
example, FIGS. 1A, 1B and 2A, 2B). This component may be adhesively bonded or otherwise
mounted to the panel, for example between the panel and the device frame. Jagged portions
provide a transition where the mechanical impedance of the panel can change slowly from that
of free glass, to that of glass and foam, and to that of the support or frame, thereby The reflection
of bending waves may be eliminated or reduced. As shown in FIGS. 1A, 1B, the additional
"continuous" portion of the foam at the panel edge may absorb any residual bending wave
energy.
[0038]
The shape and size of the "teeth" of the jagged edge can be calculated based on the properties of
the acoustic material used. The general guidelines derived from optical analogues (e.g. "moth
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eye" anti-reflective coatings) can make the lateral dimensions of the individual "teeth" shorter
than the shortest wavelength of the range of interest; It has been shown that the length of the
"tooth" can be at least 1/4 of the longest wavelength of the range of interest. Referring to Table 1
and assuming targeted reflection removal in the range of about 100 Hz to about 14 kHz, suitable
jagged edges have teeth with a width at the base of less than about 2 cm and a length of more
than about 6 cm. May be included. The size, shape and orientation of the teeth may vary
depending on the panel configuration, the sound absorbing material, and / or the desired
frequency suppression range.
[0039]
By way of non-limiting example, the damping portion may have a width at the base of about 0.5
cm, such as about 1 cm to about 4 cm, about 1.5 cm to about 3 cm, or about 2 cm to about 2.5
cm. A range of teeth may be included, including the entire range of about 5 cm, and partial
ranges therebetween. In addition, the teeth may range from about 2 cm to about 20 cm, about 3
cm to about 15 cm, about 5 cm to about 10 cm, or all ranges from about 1 cm to about 25 cm,
such as about 8 cm to about 12 cm, and partials between them It may have a length of the range
including the range.
[0040]
In some embodiments, the sound absorbing material may be used to mount the panel on a
support or frame and may be impedance matched or sloped impedance matched to the panel.
Furthermore, the damping part may have one or more layers which can have various shapes and
sizes and can be attached to the panel. For example, the damping portion may comprise one or
more polymer layers that can vary the thickness and / or density of the panel across at least a
portion of the panel. According to various embodiments, one or more layers may be provided on
one or both surfaces of the panel, for example by lamination. Lamination can provide various
advantages, such as improving panel safety and / or acoustic performance.
[0041]
For example, as shown in FIG. 3A, FIG. 3B, FIG. 3C, and FIG. 3D, by introducing a controlled local
damping, the lamination, which is a multilayer lamination or a constrained layer, can be made
incident wave energy It can be used to absorb at the edge. When the bending wave reaches the
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laminated part of the panel, a close bond at the panel / layer (eg glass / polymer) interface
transfers part of the energy into one or more layers into the layer Dissipated by its very much
higher material damping. Suitable laminate materials may include, for example, polyvinyl
butyrate (PVB), acoustic PVB, ethylene vinyl acetate (EVA), thermoplastic polyurethane (TPU),
and various ionomers, to name a few.
[0042]
FIG. 3A is a side view of the speaker panel stacked in at least one layer 145. In the illustrated
embodiment, at least one transducer 140 may be mounted on the panel 100 and an attenuation
may be mounted to the panel 100 at the opposite end. For example, the damping portion may
have one or more layers 145 that may be laminated to one or both surfaces of the panel 100.
The laminated layer 145 may be selected from the same material or may include any
combination of laminated materials. Alternatively, as shown in FIG. 3B, one surface of the panel
may be laminated with one or more layers 145, which may be constrained with an additional
layer of material 150 such as, for example, a panel material such as a glass sheet or other
material It may be done. Similarly, as shown in FIGS. 3C and 3D, at least one transducer 140 may
be mounted in the center of the panel 100 with the two attenuators each adjacent to the opposite
end. Good. Similarly, the damping portion may also have one or more layers 145 laminated to
one or both surfaces of the panel 100 or one or more layers 145 constrained with additional
layers of material 150. Good.
[0043]
The speaker assembly or acoustic device disclosed herein may further comprise a frame
extending around at least a portion of the panel. The terms "frame", "support" and their variations
are used interchangeably to refer to any material configured to support a panel. In one
embodiment, the frame may comprise a material selected from polymeric materials, plastics,
wood, and metals, to name a few. The frame or support may extend around the entire perimeter
of the panel (see, eg, FIGS. 1A and 2A), or in some embodiments, may extend around only a
portion of the panel. For example, in some non-limiting embodiments, the frame may extend
around a portion of the panel on which the attenuators and / or transducers are mounted (see,
eg, FIGS. 1B and 2B) .
[0044]
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According to various embodiments, the speaker or acoustic device may further include an
enclosure at the back of the panel having any shape and / or dimensions suitable to obtain the
desired acoustic effect. One skilled in the art can design such an enclosure using well known
loudspeaker technology. The enclosure may, for example, include at least one conventionally
designed woofer, which in certain embodiments may process low frequencies that may not be
reproduced by the panel alone. For example, according to a non-limiting example, the base or
enclosure of the speaker may extend upwardly from the base with the woofer, attenuator and at
least one transducer housed therein, as shown in FIG. 1B. The speaker panel may be rotated 90
degrees counterclockwise. In an embodiment, the panel extending from the base may be clear
glass without any frame or any visible attenuation, thereby providing a smart aesthetic design.
[0045]
Other additional components may also be included in the loudspeakers disclosed herein. For
example, functional or decorative elements may be employed in or with the loudspeakers and
acoustic devices disclosed herein. For example, decorative lighting elements may be used to
illuminate the speakers and / or to display messages. The effect of such lighting may be
decorative in nature or may act as an indicator to inform the user, for example, that the speaker
is powered. In further embodiments, the speaker may be configured with a sensor or active
device, such as, for example, a frame, a base, or a touch panel that may be provided on the
middle layer of the speaker panel and any associated electronics. . For example, in the case of a
thin glass sheet, the glass sheet is provided directly adjacent to the touch pad so that the user can
interface with the touch pad to, for example, turn on the speaker or adjust the volume. May be
[0046]
As shown in FIGS. 1A and 1B, the speaker assembly may include a row of excitation position
arrays on the panel 100. In FIG. 1A, a plurality of excitation positions 125 may be adjacent to the
(second) short side 110. A wave generated at a plurality of excitation positions can propagate in
one direction toward the (first) short side 105, and is absorbed by the attenuation portion 130
that can be adjacent to the (first) short side 105 there. It is In FIG. 1B, a plurality of excitation
positions may be located between the two short sides 105, 110, eg, adjacent to the attenuator.
For example, the damping part and / or the excitation position array may be located at the center
of the panel. A wave generated at a plurality of excitation positions can propagate in two
directions toward the (first) short side 105 and the (second) short side 110. The wave may, for
example, travel to the (second) short side 110 and then reflect to the (first) short side 105 where
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it may be absorbed or diffused. In one embodiment, the speaker shown in FIG. 1B may have
higher efficiency by transferring higher energy to the air before the waves are absorbed or
diffused, but will bend after excitation stops Due to the longer time it takes to damp waves and
sounds, it may have a somewhat longer transient response.
[0047]
As shown in FIGS. 2A and 2B, the speaker assembly may include more than one excitation
position array on the panel 100, such as two. In FIG. 2A, two excitation position arrays may be
adjacent to the short sides 105, 110 respectively. The waves generated by the two arrays can be
absorbed by the attenuator 130 which can be located between the two short sides 105, 110. For
example, in some non-limiting embodiments, the damping portion 130 may be located at the
center of the panel 100. In FIG. 2B, two excitation position arrays may be located between the
two short sides 105, 110, eg, adjacent to the attenuator. According to a non-limiting example, the
attenuator and / or the excitation position array may be located at the center of the panel. The
waves generated at the plurality of excitation positions propagate toward both short sides 105,
110 and then reflect toward the attenuation portion 130 at both short sides 105, 110.
[0048]
The disclosure of the loudspeaker assembly provided herein should be understood to be equally
applicable to the claimed audio device, and the components are interchangeable and described
without limitation. The loudspeaker assembly and acoustic device of the present disclosure may
have many advantages over conventional loudspeakers, such as, for example, DML. For example,
the loudspeaker and acoustic device of the present disclosure may provide flat frequency
response and linear phase response while minimizing ringing, eg, reducing sound attenuation
time. Furthermore, the loudspeaker and acoustic device of the present disclosure may have
enhanced aesthetic properties, and / or, for example, by the absence of attenuators at all edges of
the device, and / or by the use of transparent glass and / or transparent acoustic material. , Can
provide smaller speaker dimensions.
[0049]
It will be understood that the various disclosed embodiments may include specific features,
elements or steps associated with particular embodiments. Furthermore, although specific
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features, elements or steps may be described in connection with one particular embodiment,
various non-illustrated combinations or permutations may be substituted or combined with other
embodiments. You will also understand that it is good.
[0050]
Furthermore, as used herein, a noun should be understood to refer to "at least one" subject, and
unless explicitly stated otherwise, to "only one" subject It should not be limited. Thus, for
example, reference to "a converter" includes instances having more than one converter, unless
otherwise apparent from the context. Similarly, "plurality" or "array" is intended to indicate "more
than one". Thus, an "excitation position array" or "plurality of excitation positions" includes two
or more such excitation positions, such as three or more such excitation positions.
[0051]
Ranges may be expressed herein as from "about" one particular value, and / or to "about" another
particular value. When such a range is expressed, an example includes from the one particular
value and / or to the other particular value. Similarly, when values are expressed as
approximations, by "about", it will be understood that the particular value forms another aspect.
Furthermore, it will be understood that both endpoints of each range are significant both in
relation to the other endpoint, and independently of the other endpoint.
[0052]
As used herein, “substantial”, “approximately” and variations thereof are intended to
indicate that the described property is equal or approximately equal to the value or description.
For example, "approximately equal" is intended to indicate that two values are equal or
approximately equal, and "approximately similar" means that, for example, one element is
approximately the same in shape as another element It is intended to show.
[0053]
Unless explicitly stated otherwise, any method given herein is not at all intended to be construed
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as implying that the steps have to be performed in a particular order. Thus, any claim of the
method is optional unless it actually describes the order in which the steps follow or if it is not
stated in the claims or description that the steps should be limited to a particular order The
specific order of is not intended to be deduced at all.
[0054]
The various features, elements or steps of a particular embodiment may be disclosed using the
transition “comprising” but may be described using the transition “consisting of” or
“consisting essentially of” It should be understood to contain other embodiments. Thus, for
example, other embodiments contained in an assembly comprising A + B + C include
embodiments where the assembly consists of A + B + C and embodiments where the assembly
consists essentially of A + B + C.
[0055]
It will be apparent to those skilled in the art that various modifications and variations can be
made to the present disclosure without departing from the spirit and scope of the present
disclosure. As changes, combinations, partial combinations, and variations of the disclosed
embodiments, which incorporate the spirit and essence of the present disclosure, are possible for
those skilled in the art, the present disclosure includes the scope of the appended claims. It
should be construed to include all and equivalents.
[0056]
The following examples are not limiting and are intended for illustration only, the scope of the
present invention being defined by the claims.
[0057]
A glass sheet (Corning® Gorilla® glass, 0.55 mm thick) was used to analyze the effect of
lamination on the reflection of bending waves at the edge of the glass panel speaker.
Rectangular glass bars were laminated on one short side with PVB pieces having a length of
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about 6 inches (15.24 cm). The laminated non-laminated glass bars of the comparative example
("free end") were also evaluated. As shown in FIGS. 4A and 4B, the impulse response of each glass
bar is at a point close to the edge (6 inches (15.24 cm) from the free end, 7.5 inches (19. 05 cm))
were recorded using a laser doppler vibrometer. The corresponding wavelet maps (impulse
response shown as time-frequency) are shown in FIGS. 4B and 5B respectively. Referring to FIGS.
4A, 4B, 5A, and 5B, in both wavelet maps, as the bending waves travel from the opposite short
sides, the dispersion of the bending waves can be clearly seen. However, as shown in the circled
part of the wavelet map, a glass speaker bar with stacked edges absorbs high frequency
reflections (> 10 kHz) after the initial arrival and with squares of the wavelet map Attenuates a
broad frequency band of 1 to 6 kHz as shown in the enclosed section.
[0058]
The corresponding frequency responses are shown in FIGS. 6 and 7, respectively, as the recorded
values and the normalized values (with respect to the frequency response of the drive). Referring
to FIGS. 6 and 7, the frequency dependent attenuation caused by the laminated edge is clearly
visible at high frequencies. As discussed above for Table 1, damping at low frequencies is less
effective, presumably because these frequencies have longer wavelengths. While not wishing to
be bound by theory, damping at low frequencies can be improved by increasing the length of the
stacked PVB strips, for example, to at least about one-fourth of the longest wavelength of
interest. I will. Furthermore, higher acoustic absorption, sawtooth absorbers, multilayer
laminations, and / or laminated layers that are confined layers also improve edge absorption or
reduce the length dimension of the absorbent material. It can be used for
[0059]
Hereinafter, preferred embodiments of the present invention will be described separately.
[0060]
Embodiment 1 A panel having a long side and a first short side, and the panel so as to generate a
first wave having a wavefront approximately perpendicular to the long side and propagating
toward the first short side. At least one first transducer configured to excite the panel at a first
plurality of excitation positions thereon, and at least one mounted on the panel and configured to
attenuate wave energy A speaker assembly comprising: one attenuation portion.
[0061]
Embodiment 2 The speaker assembly according to Embodiment 1, wherein the at least one first
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transducer is a single linear transducer mounted on the panel.
[0062]
Embodiment 3 The loudspeaker according to embodiment 1 or 2, characterized in that the at
least one first transducer comprises a plurality of transducers mounted on the panel at the first
plurality of excitation positions. assembly.
[0063]
Embodiment 4 The speaker assembly according to any one of Embodiments 1 to 3, wherein the
first plurality of excitation positions are arranged in a row substantially in parallel with the first
short side.
[0064]
5. A device according to any one of the preceding embodiments, characterized in that the panel
further comprises a second short side, and the first plurality of excitation positions are located
adjacent to the second short side. Speaker assembly according to one.
[0065]
Embodiment 6 The speaker assembly according to Embodiment 5, wherein the attenuation
portion is mounted on the panel adjacent to the first short side.
[0066]
Embodiment 7 The panel further includes a second short side, and the first plurality of excitation
positions are located between the first short side and the second short side, and the damping unit
is The first to sixth embodiments of the present invention are placed adjacent to the second short
side, and the first wave reflects from the first short side toward the second short side. The
speaker assembly according to any one.
[0067]
Embodiment 8: The panel is excited at a second plurality of excitation positions so as to generate
a second wave having a wavefront substantially perpendicular to the long side and propagating
toward the second short side. 8. The loudspeaker assembly according to any one of the preceding
embodiments, further comprising at least one second transducer configured.
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[0068]
Embodiment 9 The first plurality of excitation positions are positioned adjacent to the second
short side, and the second plurality of excitation positions are positioned adjacent to the first
short side. The speaker assembly according to embodiment 8, characterized in that
[0069]
Embodiment 10 The speaker assembly according to Embodiment 9, wherein the attenuation
portion is located between the first short side and the second short side.
[0070]
Eleventh Embodiment The attenuator is located at the center between the first short side and the
second short side, and the first and second plural excitation positions are opposed to each other
on the opposite side. Embodiment 9. The speaker assembly according to embodiment 8,
characterized in that it is located adjacent.
[0071]
Embodiment 12. The speaker assembly according to any one of Embodiments 1-11, further
comprising a frame configured to support at least a portion of the panel.
[0072]
Embodiment 13 The panel is characterized in that it is a glass panel selected from single glass
sheet, multiple glass sheets stacked in one, laminated glass of glass and glass, and laminated
structure of glass and polymer. 13. A loudspeaker assembly according to any one of the
preceding embodiments.
[0073]
Embodiment 14 The embodiment according to any of embodiments 1 to 13, wherein said panel
comprises a material selected from metal, plastic, wood, plywood, paper, a composite of glass and
plastic, and designed honeycomb panel. The speaker assembly according to any one.
[0074]
Embodiment 15. The loudspeaker assembly according to any one of the embodiments 1 to 14,
wherein the attenuating part comprises a serrated portion having a serrated edge.
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[0075]
Embodiment 16 The speaker assembly according to any one of Embodiments 1 to 15, wherein
the attenuation portion is laminated to at least one surface of the panel.
[0076]
Embodiment 17. The loudspeaker assembly according to any one of the embodiments 1 to 16,
wherein the attenuating part comprises at least one layer of sound absorbing material.
[0077]
Embodiment 18 The speaker assembly according to embodiment 17, wherein at least one layer
of the sound absorbing material is located between the panel and at least one further layer.
[0078]
Embodiment 19 The speaker assembly according to any one of Embodiments 1 to 18, wherein
the long side or the first short side is non-planar.
[0079]
Embodiment 20. Excitation of the panel at a plurality of positions using one or more transducers
so as to generate a wave having a wavefront substantially perpendicular to the long side of the
panel and propagating towards the short side of the panel A sound generating method
comprising the steps of: attenuating wave energy using at least one attenuating portion placed on
a short side of the panel.
[0080]
100 panel 105, 110 short side 115, 120 long side 125 excitation position 130 damping part
135 frame 140 transducer
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