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Specification 1, title of the invention 2,% claim 1, acoustic compartments and a pair of oppositely
directed electro-acoustic transducers acoustically driven or driven by the chopsticks An electric
sound 41 characterized in that each of the surfaces is made to move in the direction opposite to
the direction of movement of the other surface at each moment in use. 1 converter.
Improvement of electroacoustic transducer
3. Detailed Description of the Invention The present invention relates to a member for reducing
the fe ate (fe @ dback) of the electro-acoustic transducer system, in particular for the reduction of
mechanical and magnetic foot torque of high power hearing aids. In an electroacoustic system
such as a hearing aid system comprising an acousto-electrical and / or magneto-electrical input
transducer, an amplifier and an electro-acoustic output transducer, various types of feedback are
included, including mechanical and magnetic feedback. Happens. This feedback is a major
problem, particularly in the installation of hearing aids where compactness and high power are
required. Thus, the main object of the present invention is to provide a member for reducing
mechanical feedback from an output converter, such as an earphone, to an input converter, such
as a micro-ho. It is also intended to reduce the magnetic feed from the coil to a magnetoelectric
input transducer such as an induction or telephone coil. According to the invention, it comprises
an acoustic compartment and a pair of opposed electro-acoustic transducer faces which are
acoustically driven or driven by K, said acoustic compartment, each moment of use An electroacoustic transducer is provided in which each of the surfaces is moved in the direction opposite
to the direction of movement of the other surface. Each of the faces is a dynamic capacitor,
electret, ceramic or piezoelectric? Each of the diaphragms has a member connected to it such
that each of the 10 of these faces is driven or driven by a diaphragm, consisting of the faces of
the lima transducer, and the acoustic compartment And may be comprised of an electro-magnetic
system comprising an armature connected to the diaphragm 15, which may comprise a
diaphragm provided to drive or be driven by it. The most dynamic electro-acoustic transducers
produce mechanical vibrations that can be transmitted 20 to a self-resonant acousto-electrical
input transducer designed with a single diaphragm displaced in response to the electrical input,
thereby its diaphragm Activate. In aspect, the present invention aims to reduce this vibration by
using an electro-acoustic transducer with a balanced opposing diaphragm which has been
activated to produce very low mechanical vibration "@" at the desired sound power. Ru. In the
case of a system that includes a magneto-electric input transducer and a dynamic electroacoustic output transducer, the separate electro-magnetic circuits that can be included in each
diaphragm in the output transducer tend to balance alternating magnetic radiation. It also
reduces the problem of magnetic feedback in such systems.
Other features of the present invention will become apparent from the accompanying drawings
which illustrate various embodiments of the present invention. Referring first to FIG. 1, an
electro-acoustic transducer according to the present invention is shown, which is intended in
particular for use as an earphone in a hearing aid system. In FIG. 1, the exterior / one housing 10
is provided with a pair of balanced, opposed diaphragms 11.12 therein, and the diaphragms
acoustically drive one compartment or cavity 13 therebetween. The acoustic outlet from the
cavity 13 is via one outlet tube 14 and the limb tube 14 may for example have a diameter of 1 to
2 cranes. Each of the diaphragms 11.12 is perforated at 15 to equalize static air pressure
changes and is supported by the support member 16 within the five housings. Each of the
diaphragms 11.12 is connected to the shim root 18 by a connecting member 17. The armature is
fixedly supported at its one end 19 in the outer housing 10 to each magnetic circuit. The other
end 20 of each armature shaft 18 is located in the magnetic field of the magnet 21. It is driven
by the changing magnetic field generated by the coil 22 in the electro-magnetic system of each
armature 18 ti earphone, and the electrical input to the coil 22 is performed by the terminals
23.24 and 25,26. As outlined above, in use, each of the diaphragms 1i 12 will be driven by its
respective coil 22 so that it will move in opposite directions relative to the other diaphragms at
each instant, of each of the coils The electrical connection may be 20 EndPage: 2 series by either
parallel or series connection. Parallel connection company Connecting the start terminal 23 of
one coil to the terminator 26 of the second terminal and connecting the terminator 24 of the first
coil to the start terminal 25 of the second terminal to drive the converter through the terminal
23.24 Is achieved. A series connection is achieved by K connecting the end 24 of the first coil to
the end of the second coil and driving the transducer through the terminal 23.25. The connection
of the coil 22 may be either inside or outside the outer housing 1 °. The motion elements of
each dia- 7 ram system are balanced even if the manufacturing tolerances do not eliminate the
reverse oscillations at all, so they are dynamically balanced and the motion generated in one
motion system is generated in the other diaphragm system 1800 It is neutralized by out-of-phas
oscillation. Thus mechanical feedback is reduced. However, further reduction of the total external
conversion vibration may be achieved by adjusting the electrowax drive of each of the coils 22,
eg by adding a resistor for balancing i). The accompanying alternating magnetic fields reduce the
magnetic feedback in the system which substantially dissipates outside the outer housing 10
causing such problems.
The experimental work performed on hearing aid system earphones of the type shown in FIG. 1
achieves at least a typical improvement of 134B5 over most of the frequency range from 100 to
6000 Hz, from 8 dB in one narrow frequency band to the other It has been shown that an
improvement of between 20 and 30 dB in frequency is achieved. In general, it is expected that
fabrication earphones using the present invention will exhibit a typical improvement of up to
1020 dB in mechanical vibration problems relative to conventional single diaphragm
transducers. Of course, the device of FIG. 1 will operate as an acousto-electric converter instead
of an electric sound IIl converter as shown, in this variant the tube 14 has a 15 sound inlet to the
compartment 13 The compartment drives diaphragm 11.12 to produce an electrical output at
terminals 23.24 and 25.26. FIGS. 2 and 3 show a variant of the invention in which, unlike the
embodiment of FIG. 1, the diaphragm is incorporated in a bifurcated housing, which is suitably
connected to drive the diaphragm. Or provide a single acoustic compartment driven by a
diaphragm. In FIG. 2, each of the pair of housings 30 has a diaphragm provided therein and is
driven by the acoustic compartments 33.33 '. A member (not shown, but would be an electromagnetic system as shown in FIG. 1) is driven by each of the diaphragms 31 and the terminals
A1. Producing an electrical output at B1 and A2, B2, which are summed in parallel as shown as
Fo. Alternatively, these outputs can be added serially. The acoustic compartments 33.33 'are
connected to form a common compartment for driving each of the pair of diaphragms 31, and
the common compartment supplies the acoustic input Al through the pipe 34 including the
branch coupler 38. Be done. Each of the diaphragms 31 is pierced at 35 and supported by the
support member 36 as described above with reference to FIG. The housing 30 DEG 30 'is of
course physically supported and oriented, the balanced diaphragms facing each other and hence
the housing 111i1.X1. X2 are adjacent to each other. The device shown in FIG. 3 is similar in
physical form to that of WJ 2 5 and uses the same numbers to denote the same parts. In the
device of FIG. 3, however, balanced counter diaphragm 31 drive Human power Ei to the housing
member is a terminal AI, 81 and A2.
B2からされる。 This input may be a parallel connection as shown, or by a series connection as
described above with reference to FIG. In FIG. 3, of course, the tube 34 provides an outlet for the
acoustic output A0 from a common acoustic compartment made of separate compartments
33.33 '. The use of diaphragms driven or driven by an acoustic chamber has been clarified
according to the description given above with reference to FIGS. 1 to 3 and to the above 15 with
reference to FIGS. 1 to 3. The illustrated device balances the diaphragms without departing from
the teachings of the present invention (opposed dynamic; impedance, electret 2 ° EndPage: 3 g,
ceramic and piezoelectric? It can be easily replaced by replacing with a lima type converter. From
the above description it will be clear that the invention provides a simple and effective
component for reducing feedback in a system using an electro-acoustic transducer 0 with
reference to a specific embodiment of the invention Although illustrated and described, it will be
readily understood by those skilled in the art that various modifications can be made without
departing from the true spirit and scope of the present invention.
4. Brief description of the drawings FIG. 1 is a schematic cross-sectional view of a first
embodiment of the electroacoustic transducer according to the present invention, FIG. 2 is a
schematic cross-sectional view of a second embodiment of the device according to the present
invention, The figure is a schematic cross-sectional view of a third embodiment of the device
according to the invention. 11.12.31 ... diaphragm, 13.33 ° 33 '... compartment, 18 ... armature,
22-· · coil. 2nd. m to j, 1! (1) Patent Director, Mr. Zenji Kumagaya 1, display of the case, 1979
patent application No. 155038 2, title of the invention 2, name of the invention, modification of
the electroacoustic transducer 3, related patent application with the case of person making
correction Person name The Common Wells Op Australia 4, agent End Page: 46, subject of
amendment (11 “Application representative's representative” column (2) Power of attorney (3)
Drawing 7, contents of amendment (11, (2 ) As shown in the attached sheet (3) A clean book of
the drawing (no change to the contents) 8 and a list of attached documents (11 application for
correction (1) (2) power of attorney and one translation each (3) one drawing EndPage: 5
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