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The present invention relates to a method of combining hollow glass spheres forming an acoustic
matching member for a transducer, a matching member thus formed, and a transducer
incorporating such a matching member. It is about UK Published Patent Application No.
2225426 discloses a method of combining hollow glass spheres to form an acoustic matching
member for a transducer.
In this method, a sphere, eg a microsphere or bubble, is placed in a mold to form a matrix or bed,
the matrix is heated to a temperature at which the glass softens and then the spheres are It is
compressed to reduce the total volume it occupies, and adjacent spheres combine as done by the
sintering process. The temperature and compression conditions are controlled to intentionally
form voids between the unbonded spheres due to the spherical shape of the spheres. The high
proportion of the matrix portion is occupied by the pores to create low acoustic impedance
([email protected] or less) and to form an acceptable acoustic coupling between the gas and the
transducer's piezo element is important. It is also important that the coupling between adjacent
spheres is substantially complete. If too many of the contacting spheres are not combined with
their neighboring spheres, the impedance will be unpredictable and the impedance will differ
depending on the loudness.
[0003] Unfortunately, in the above-described bonding method, it has been found that certain
spheres, in particular those which are in the center of the matrix and which are remote from the
compression source during sintering, remain unbonded with their adjacent spheres. Furthermore,
in use, it has been found that the spheres may touch the bond from the adjacent spheres.
Accordingly, it is an object of the present invention to reduce the degree of non-coupling
described above.
According to one aspect of the invention, in a method of combining adjacent hollow glass spheres
to form an acoustic matching member for a transducer, the adjacent spheres with a
thermosetting resin and a volatile organic solvent The mixture is placed at a temperature
sufficient to remove the solvent and cure the resin, bonding the adjacent spheres together, the
size and density of the spheres and the concentration of the resin in the solvent from the contact
point A method is provided, characterized in that the pores are left to remain between the outer
surfaces of the distant binding spheres.
According to another aspect of the invention, in the method of forming an acoustic matching
member for a transducer, a matrix of hollow glass spheres such that the pores are formed
between the outer surfaces of the glass spheres away from the contact points. The present
invention provides a method characterized in that adjacent spheres in the inside are bound by a
According to another aspect of the invention, it comprises a matrix of hollow glass spheres, said
spheres being bound by a resin such that the pores remain between the contact points and
between the outer surfaces of said spheres. An acoustic matching member for a transducer is
According to still another aspect of the present invention, there is provided a transducer having
the above alignment member fixed to a piezo element.
EXAMPLES Referring to FIGS. 1 to 4, the transducer comprises a piezo element in the form of a
PZT cylinder 1, for example a PZT 4 type or a PZT 5A type piezo element, the piezo elements
being electrically connected The protective layer of the member 4 in the form of wires 2, 3 (FIG.
1), an acoustic matching member 4 for the cylinder 1 and a thin disc 5 (see FIGS. 2 to 4) is
The aligning member 4 is a cylinder type fixed to one end face of the PZT cylinder 1, one wire 2
is connected to the peripheral wall thereof, and the other wire 3 is connected to the other end
face of the cylinder 1 .
As shown in FIG. 5, the alignment member 4 has a solid matrix of glass bubbles or microspheres
6, and the adjacent bubbles 6 are bonded to the area of the contact point by the resin, and the
pores 7 are the bubbles 6. It is intentionally formed between the outer surfaces.
Foam 6 is of the type A16 / 500 manufactured by the company 3M and is known as C-glass.
The dimensions of the bubbles are in the range of 20 to 130 μm and the average size is 60 μm.
The resin is an epoxy. Standard resins are available from Design Resins Ltd. It is ER1040 made
The disc 5 is made of polysid (trade name Kapton) and has a thickness of 0.07 mm. Instead of a
disc, a cup-shaped layer may be used to provide side protection as well as end protection. Instead
of plastic materials, metals such as aluminum could be used as a protective layer if they are
sufficiently thin. The transducer is manufactured as follows. First, the resin is dissolved in a
suitable solvent such as acetone. The weight ratio of resin to solvent in the solution is in the
range of 1:10 to 1: 1, for example 1: 2. The viscosity of such a solution may be slightly higher
than the viscosity of the solvent, for example in the range of 0.3 to 10 centipoise.
Glass foam is then added to the solution to "absorb" all of the solution until the final resin /
solution mixture becomes stiff with no visible liquid volume. The foam density at this stage is
close to solid. In addition, the protective disc is inserted through the open end of a cylindrical
mold of known type which may be made of silicone rubber and the disc rests at the base of the
disc. The mold has the same inner diameter as the outer diameter of the PZT cylinder.
Next, a quantity of foam / solution mixture is transferred into the mold, for example by means of
a spatula, leaving the top cavity into which the PZT cylinder is to be inserted next. Furthermore, a
moderately constant pressure is imposed on the cylinder by means of a known spring-loaded
plunger, which presses the foam / solution mixture and compresses the mixture. The mold is
then heated to a temperature above the boiling point of the solvent to remove the solvent. In the
case of an acetone solvent, this temperature may be Furthermore, the mold is heated
to a temperature sufficient to cure the resin, which, for the two part epoxy mentioned above, up
to the temperature of C. or C. with pressure still applied. Temperature.
This process produces a transducer of the type described above in which the cylindrical
alignment member is disposed between the PZT cylinder and the protective disk, and both the
cylinder and disk are secured to the alignment member by the resin. The spheres are connected
by resin to their contact points, but pores are left between the spheres.
Thus, the alignment member can form a quarter wavelength acoustic coupling for the transducer
if it is of the correct length for the PZT cylinder.
Brief description of the drawings
It is a perspective view of the converter seen from the side of FIG.
It is a whole side view of FIG.
3 is a cross-sectional view taken along the line AA of FIG.
4 is an enlarged cross-sectional view of the alignment member of the converter.
5 is an enlarged view showing the microstructure of the circular portion of the alignment
member of FIG.
Explanation of sign
Reference Signs List 1 PZT cylinder 2 electrical connection wire 3 electrical connection wire 4
acoustic matching member 5 disc 6 glass foam 7 pore
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