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JP2015114322

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2015114322
The present invention provides an acoustic dissipating film for a musical watch or striking watch
that is fabricated to obtain an amplification response of the film over a wider frequency
bandwidth. A dome-shaped acoustic radiation film (1) comprises an active central portion (2), a
connection element (5), a peripheral ring (2 '), a side wall (3), and a peripheral portion (4).
Connected to ', the active central portion 2, the connecting element 5 and the peripheral ring 2'
are dimensioned to predetermined dimensions, whereby one or more primary vibration modes of
the timbre in the frequency range of 500 Hz to 3.5 kHz are To amplify. [Selected figure] Figure
1a
Sound dissipating film for musical watch
[0001]
The present invention relates to an acoustic spreading film for a musical watch or striking watch.
[0002]
In the field of watchmaking, a striking mechanism may be added to the watch movement to
generate sound or music.
The diaphragm of the striking watch gong or musical watch is generally disposed within the
watch case. This transmits the vibrations of the gong or the strip of the diaphragm to the various
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exterior parts of the watch. These exterior parts are, for example, the middle part of a watch case,
a bezel, a windshield, and a back cover. Such large exterior components begin to dissipate sound
into the atmosphere due to the effects of transmitted vibrations. These exterior components can
dissipate the generated sound into the atmosphere by means of hammered gongs or by means of
one or more vibrating strips of the diaphragm.
[0003]
Usually, in this type of striking watch or musical watch, the acoustic efficiency based on the
complex vibration-acoustic conversion of exterior parts is low. In order to improve and increase
the level of sound perceived by the user of the striking watch or musical watch, the material,
geometry and boundary conditions of the exterior part must be considered. The construction of
such exterior parts also depends on the aesthetic appearance of the watch and on the stresses in
the operation, which may limit its adaptability.
[0004]
A membrane can be disposed within the watch case to further enhance the vibration-acoustic
conversion efficiency of the striking mechanism. The membrane must be dimensioned so that it
can be efficiently dissipated the sound having a tonal character produced by the vibration of one
or more gongs or strips of diaphragms. Therefore, it is important that the frequency of such a
timbre be close to the eigenmode of the membrane so that the membrane can be made to
resonate.
[0005]
However, in this regard, it is difficult to obtain high mode density over a limited frequency
bandwidth of, for example, 500 Hz to 3.5 kHz using standard uniform membranes. This is
because such properties are only compatible with very low stiffness or very high mass
membranes. In this way, if the first resonance mode is lowered to about 1000 Hz, the frequency
of the excitation mode whose acoustic performance is very limited is also lowered to less than
4000 Hz, so the above-mentioned 2 of extremely low rigidity and extremely large mass. Having
one property is disadvantageous. Thus, mechanical energy is dissipated into the vibrational
modes of the membrane with low acoustic efficiency. Thus, the dissipation efficiency, which is
logically defined as the ratio of the dissipated acoustic energy divided by the total energy
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transferred to the membrane, decreases over almost the entire frequency range of interest. Thus,
it is difficult to obtain resonances for all tones produced by the striking mechanism, which
constitutes a disadvantage of the prior art membranes.
[0006]
In this regard, reference may be made to U.S. Pat. No. 5,958,095 which discloses an acoustic
spreading film for a musical watch or striking watch. The sound dissipating film has a generally
dome-like shape, and its peripheral edge is sandwiched between a part of the middle part of the
watch case and the back cover. The membrane is designed with one or two asymmetrically
shaped regions formed in the material of the membrane. The two regions excavated almost all
over the thickness of the membrane have different dimensions. These two regions form an
ellipse, which are offset from one another with respect to the center of the membrane and
partially overlapping. These ellipses of the membrane allow one to have twice the number of
vibration modes for each ellipse as compared to the circular one. However, this can increase the
bandwidth of the membrane's vibrational modes in order to obtain an amplified vibrational
response over a larger frequency band. This constitutes a drawback.
[0007]
European Patent No. 2461219 A1
[0008]
Accordingly, the object of the present invention overcomes the drawbacks of the prior art
described above by providing an acoustic dissipating film for a musical watch or striking watch
made to obtain an amplification response of the film over a wider frequency bandwidth It is to
be.
[0009]
The invention accordingly relates to an acoustic spreading membrane comprising the features
defined in independent claim 1.
[0010]
Specific embodiments of this sound dissipating film are defined in the dependent claims 2-17.
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[0011]
The advantage of this sound dissipating film is that the central part is made in the form of a
piston according to the principle of loudspeakers, thereby ensuring an increase in the amplitude
of the vibration, in particular over the frequency band 500 Hz to 3.5 kHz.
With such a complex geometrically shaped acoustic membrane made of a predetermined
material and having an overall thickness defined by the in-plane dimensions corresponding to the
in-plane dimensions of the watch case or windshield, the acoustic response of the membrane Is
relatively uniform in this frequency range.
[0012]
The reason for this advantage is that for this type of configuration, the most acoustically efficient
fundamental vibration mode frequency can be lowered by approximately 1000 Hz without
significantly reducing the acoustically inefficient excitation mode frequency. is there.
Thus, the film responds over the frequency band of interest (500-3500 Hz) in response to the
spatial deformation of its fundamental vibration mode, which maximizes the acoustic dissipation.
[0013]
Advantageously, the deformation of the central part of the membrane corresponding to the first
vibration mode is different from a standard flat bottom membrane.
Movement perpendicular to the central part of the membrane is identical over the surface of the
central part.
This significantly increases the sound dissipation and guarantees the amplification of the series
of tones produced in a musical watch or striking watch. Thus, the primary vibration mode of each
tone generated is at least in the frequency range of 500 Hz to 3.5 kHz. The second-order natural
vibration mode is also in the frequency range of 500 Hz to 3.5 kHz. Furthermore, the peak width
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of at least the first order vibration mode is larger than that of a standard flat bottom membrane.
[0014]
Advantageously, the film can be made of amorphous metal or metallic glass, or even of gold or
platinum, or of brass, titanium, aluminum or other materials with similar densities, Young's
modulus and elastic limit. Such a membrane allows the extension of the sound bandwidth to be
combined with a very low internal attenuation, which allows very good acoustic performance.
[0015]
The objects, advantages and features of the above-mentioned sound dissipating film for a musical
watch or striking watch will become more apparent in the following description, which is made
on the basis of at least one unrealistic embodiment shown.
[0016]
FIG. 1a is a simplified three-dimensional view of an acoustic spreading film according to the
invention.
FIG. 1 b is a radial cross-sectional view along line II of FIG. 1 a of an acoustic spreading film
according to the invention. FIG. 2 shows a graph of integral frequency response of velocity
amplitude perpendicular to the membrane over the entire volume of the membrane for a
standard metallic glass membrane and the metallic glass membrane according to the
embodiment of FIGS. 1a, 1b. FIG. 3 shows a graph of the ratio between the frequency response of
the membrane according to the invention shown in FIG. 2 and the frequency response of a
standard membrane.
[0017]
In the following description, reference is made to the construction of an acoustic dissipating film,
in particular for producing a musical watch or a striking watch. The sound dissipating film is
made in a complex shape to increase the vibration amplitude of the different tones produced in
the watch case. In particular, the membrane is dimensioned to amplify the primary vibration
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mode, or even the secondary vibration mode, into the frequency band of 500 Hz to 3.5 kHz.
[0018]
1a, 1b show an embodiment of an acoustic spreading film 1 in which a musical watch or striking
watch can be manufactured. Depending on the shape of the watch case, the sound dissipating
film 1 may be generally rectangular or polygonal as seen from above or preferably circular as
shown in FIG. 1a.
[0019]
The membrane 1 is configured, for example, in the form of a dome with an active central portion
2, 2 ', 5 defining the base of the dome, a cylindrical or even slightly conical side wall 3 and a
peripheral edge 4. The central active part is formed by the central base 2 connected to the
peripheral ring 2 'via the connection element 5, which may be concentric with the central base.
Such connection element is in the form of a strip and is defined as sector 5. Sector 5 is preferably
a circular or angled sector attached to the inner edge of the ring starting from the circular
peripheral edge of the base. Openings or holes 5 ′ may be provided between each angled sector
5.
[0020]
The angled sectors 5 may be regularly arranged at the periphery of the central base 2 in the
form of a disc, and these angled sectors 5 may have the same dimensions. The general shape of
the holes 5 'is the same in each angled sector. The angle of each sector 5 defined with respect to
the center of the membrane 1 may be the same as the angle defined by each hole 5 '. Thus, four
angled sectors and four holes may be provided, each defined at an angle of 45 °. However, the
angle of each sector may be different from the angle of each hole.
[0021]
The peripheral ring 2 'disposed between the plurality of sectors 5 and the side wall 3 is a circular
ring as shown in FIG. 1a. The peripheral ring 2 'is configured as a conical portion having a
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relatively large opening angle of, for example, about 80 DEG with respect to the central axis of
the membrane. The peripheral ring is configured to extend towards the outside of the dome.
[0022]
It should be noted that the central base 2 may also be rectangular, such as a peripheral ring. In
this case, at least four connecting elements 5, such as connecting sectors, are provided on each
side of the rectangular base. This central base can also be devised to have first and second
connecting sectors which respectively connect with the central base 2 and the peripheral ring 2 '.
The first and second connection sectors are alternately arranged over the entire periphery of the
central base, but the thickness of the first connection sector is different from the thickness of the
second connection sector. In this case, no hole 5 'is provided between the central base 2 and the
peripheral ring 2'.
[0023]
It should also be noted that instead of the rim 4, edges can be provided in the form of a plurality
of rim portions distributed over the rim of the side wall 3 to secure the membrane to the inside
of the watch case.
[0024]
The sound dissipating film 1 and all the elements constituting it may be formed as a single piece
of the same material which may be metal.
In the embodiments described herein and described below with reference to FIGS. 2 and 3, the
material may be amorphous metal or metallic glass. However, this membrane may be made of
other materials such as, for example, gold or platinum or even brass, titanium, aluminum etc.
with similar density, Young's modulus and elastic limit.
[0025]
Also, two different materials may be combined by soldering, brazing, driving or coating to make a
membrane. According to a non-limiting version, the central base 2 is made of material M1 and
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the peripheral ring is made of a second material M2 different from M1. According to a second
non-limiting version, the central base 2 is made of material M1 and the connection element 5 is
made of a second material M2 different from M1. According to a third non-limiting version, the
membrane is made of material M1 and the surface coating is made of material M2. This coating
has a different thickness with respect to the central base 2, the peripheral ring 2 ', the connection
element 5, and the thickness may not be uniform.
[0026]
The acoustic membrane 1 can be placed in the watch case (not shown) by means of the
peripheral portion 4 clamped in a conventional manner using a sealing gasket between the back
cover and the middle portion of the watch case. After placing the membrane in the watch case,
the piston-like central part is not in contact with the other parts of the watch and can therefore
vibrate freely. The central part and in particular the central base 2 are arranged close to the back
cover of the watch case but do not touch. According to FIGS. 1a, 1b showing the membrane in a
bottom view, the central base 2 and the angled sectors 5 are planar in shape and arranged on the
back cover side of the watch case via a conical peripheral ring 2 'connected to the side wall 3. Be
done.
[0027]
The diameter of the central portion starting from the connection to the side wall 3 via the
peripheral ring 2 'may be more than 15 mm, preferably more than 20-40 mm. If the peripheral
part 4 can be clamped between the peripheral support of the watch case back cover and the
circular inner rim of the case middle part, the diameter may be equal to the diameter of the
watch windshield (not shown). The diameter of the central base 2 may be 60% to 70% of the
diameter of the entire central portion. The peripheral ring 2 has an inner edge portion with a
diameter of 13 mm when the diameter of the central portion is 15 mm, and an inner edge
portion with a diameter of 34 mm when the central portion is 40 mm, but the diameter of the
central base is the central portion Depending on the overall diameter, it may be 10-27 mm.
[0028]
The thickness of the disc-shaped central base 2 may be the same at all points and may be greater
than the thickness of the peripheral ring 2 '. The thickness of the angled sector 5 is identical in
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all respects and less than the thickness of the peripheral ring. The thickness of each angled
sector is much smaller than the thickness of the central base that defines the central mass. The
thickness of each sector may be selected to be 50-100 μm, and the thickness of the peripheral
ring 2 'may be more than 100 μm and less than 1 mm. The thickness of the central base 2 may
be at least twice the thickness of the peripheral ring.
[0029]
Thus, by setting the size of the piston-like central part according to the material forming the
central part, the vibration is amplified over the frequency band of 500 Hz to 3.5 kHz. Thus, the
acoustic response of the membrane is relatively uniform in this frequency band. Thus, when the
membrane is placed on a striking watch or musical watch, the primary vibration mode of each
tonal color produced will be at least within the frequency range of 500 Hz to 3.5 kHz.
[0030]
In order to more clearly show the advantage of producing an acoustic dissipating membrane
having a piston like central portion according to the principle of loudspeakers, reference is made
to the graphs of FIGS. FIG. 2 shows a graph of integrated frequency response of velocity
amplitude perpendicular to the membrane over the entire volume of the membrane for a
standard metallic glass membrane and a metallic glass membrane according to the invention.
This quantity is mathematically defined as R (f) = o Vol | vz (x, y, z, f) | dx dy dz. FIG. 3 shows a
graph of the ratio of the membrane according to the invention to a standard membrane.
[0031]
With respect to the graphs shown in FIGS. 2 and 3, the peak width of the primary vibration mode
of 1.5 kHz to 2 kHz (eg, 1.75 kHz) is larger than the peak of the primary vibration mode of a
standard film and has a large amplitude. Furthermore, for the membrane according to the
invention, another peak of the 2.5 kHz to 3 kHz secondary vibration mode is also present. Such a
radiating membrane made with a complex shaped active central part can increase the oscillation
amplitude in the frequency range of 500 Hz to 3.5 kHz. This is an advantageous difference to
standard membranes where the central portion is simply flat.
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[0032]
It should also be noted that the piston-like membrane according to the invention allows to obtain
the same movement over the entire surface, thus ensuring a more effective dissipation effect
compared to any prior art membrane.
[0033]
From the above description, those skilled in the art can devise several variants of the sound
dissipating film for a musical watch or striking watch without departing from the scope of the
present invention as defined by the claims.
The thickness of the sectors connecting the central base to the peripheral ring may be variable.
However, this is less than the thickness of the ring and the thickness of the central base.
[0034]
DESCRIPTION OF SYMBOLS 1 sound diffusion film 2 central active portion, central base, central
portion 2 ′ central active portion, peripheral ring, central portion 3 side wall 4 peripheral
portion 5 central active portion, connection element, central portion, angled sector 5 ′ hole 10
musical watch The striking watch M1 material M2 material
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