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JPS57171371

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DESCRIPTION JPS57171371
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional bone
conduction type electro-acoustic transducer, and FIG. 2 is a cross-sectional view of a vibration
transmission portion of the bone conduction type electro-acoustic device according to an
embodiment of the present invention. FIG. 3 is a cross-sectional view of a vibration transmitting
portion of a bone conduction type electroacoustic apparatus according to another embodiment of
the present invention. 1 ... Closed magnet type magnet unit, 2 ... Vibration transmission part, 3 °
3 '... Spring part, 4.4' ... Armature, 5 ... Natto, 6.6 ', 6 ", · · · Contact part, 7 ... screw.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bone conduction
type electroacoustic transducer, and its object is to expand the frequency band in the high
region. The bone conduction type electroacoustic transducer is formed by mounting the vibration
transmitting unit 2 to the open magnet type magnet unit 1 as shown in FIG. The conventional
vibration transmission unit 2 contacts the bone portion and contacts the contact portion e made
of plastic for transmitting vibration through the nut 6 and the spring portion 3 which are made
of a polymer such as brass etc. Armor 816/7/37 / 2 and 4 are integrally joined by three screws
7. The spiral magnet type magnet unit 1 is provided with an inner iron type polar magnet type 7
elite core 1a and a permanent magnet 1b wound with a coil 1c. A closed magnetic path is formed
by the closed magnetic ferrite core 1 a and the armature 4 by mounting the magnetism type
magnet unit 1 and the vibration transfer unit 2. In such a bone conduction type electroacoustic
transducer, there is a drawback that the mass of the vibration transmission unit 2 becomes large
and the frequency band of the high region becomes narrow because the nut 5 made of heavy
metal is used for the vibration transmission unit 2. The The present invention is intended to
eliminate such a drawback, and to provide a bone conduction type electro-acoustic transducer in
which the mass of the vibration transmission part is reduced to widen the frequency band of the
high region. Hereinafter, one embodiment of the present invention will be described with
reference to FIG. FIG. 2 is a cross-sectional view of the vibration transmitting portion of the bone
04-05-2019
1
conduction type electric) acoustic converter according to an embodiment of the present
invention, and the demagnetizing magnet unit of the mouth device 173 is the same as that shown
in FIG. . In the drawing, 4 is an armature made of a magnetic material, and 6r is a contact portion
made of plastic or the like in contact with the bone portion to transmit vibration. The contact
portion 6 'and the armature 42 are arranged by directly arranging the contact portion 6' and the
armature 4 on both sides of the spring portion 30, and inserting and screwing the screw 7
reaching the contact portion 6r from the armature 4 side. Fix directly to part 3. The vibration
transmitting portion thus fixed is configured to form a closed magnetic path in the gag magnet
type magnet unit 1 by the grommet type 7 elite core 1 a and the armatinia 4. By doing this, the
nut 5 and one of the screws 7 can be reduced, and the mass of the vibration transmitting portion
can be reduced. An acoustic transducer can be obtained. Next, another embodiment of the
present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view of a
vibration transmitting portion of a bone conduction type electroacoustic transducer which is
another embodiment of the present invention, and a magnetism type magnet unit of the same
device is the same as that shown in FIG.
In the figure, 3 'is a spring portion having two through holes, and 4' is an armature having two
engaging holes for engaging with two projections of the contact portion 6 "made of plastic, ivory
or the like. Directly engage the two projections of the contact portion 6 ′ ′ with the two
holding holes of the armature 4 ′ through the two through holes of one spring portion and
insert the screw 7 reaching the armature 4r from the contact portion 6 ′ ′ side The vibration
transmitting portion is formed by directly screwing and fixing the armature 4 ', the spring 3' and
the contact portion 6 ". In the bone conduction type electroacoustic exchange apparatus of the
present embodiment, a closed magnetic path is formed by the vibration transmitting portion and
the magnetism type magnet unit 1 shown in FIG. 1 by the magnetism type ferrite core 1a and the
armature 4 '. Attached to the 1B, the contact portion 6 ′ ′, the spring portion 3 and the
armature 4 ′ can be fixed directly and reliably with one screw 7, so that the number of parts
and the mass can be largely reduced. You can make it possible. Also, although the example in
which the contact portion is made of plastic is shown as an example, the present invention is not
limited to this, and the contact portion may be formed of another material such as hard rubber.
As described above, according to the present invention, by attaching the contact portion directly
to the spring portion to reduce the mass of the vibration path transmission portion, the
frequency band of the high region is wide and the bone conduction type electroacoustic with a
small number of parts A converter can be provided.
04-05-2019
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