JPH02104200

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DESCRIPTION JPH02104200
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
hearing aid, and more particularly to a hearing aid that does not use an earphone. [Prior Art] A
conventional hearing aid is provided with an earphone, and has adopted a use form in which the
earphone is inserted into the ear canal. [Problems to be Solved by the Invention] Even if it is
known that such a hearing aid is useful, it does not wear a hearing aid because of the discomfort
of pushing the earphone into the external ear canal, and it is inconvenient. There was a problem
that there were very many deaf people. [Means for Solving the Problems] In the present
invention, in order to solve the above-mentioned problems, a first reflector having a rotation
parabolic surface, and a sound disposed at the focal point of the first reflector. A structure
comprising a generator and a second reflector disposed opposite to and in contact with the end
edge of the first reflector and having an opening at the center portion was employed. [Operation]
When the above-described structure is adopted, the sound generated from the sound generation
device is reflected by the first reflector as parallel sound waves toward the direction of the
second reflector. Most of this sound wave is emitted from the opening of the second reflector in
the direction of the user. On the other hand, the sound wave from the first reflector reflected
toward the portion other than the opening of the second reflector is reflected from the portion
other than the opening of the second reflector, and the sound of the first reflector is again
transmitted. Head in the direction. Thereafter, the same operation is repeated, and the sound
from the sound generating device is narrowed and emitted toward the user facing the opening of
the second reflector, and the limited space around the user is emitted. Voice can be transmitted
in an enlarged manner. BRIEF DESCRIPTION OF THE DRAWINGS The invention will be explained
in more detail below with reference to several embodiments shown in the drawings. In the
following embodiments, the same or corresponding parts are denoted by the same reference
numerals, and the description thereof will be omitted. [First Embodiment FIG. 1 illustrates the
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first embodiment of the present invention, and what is indicated by reference numeral 1 in FIG. 1
is a first reflector, which is formed in a dish shape having a paraboloid of revolution] There is. A
sound generator (speaker) 2 is disposed at the focal point of the first reflector 1. The sound
generation device 2 is fixedly arranged by a support member such as a support (not shown). On
the other hand, the second reflector is shown by the code 3 and has a paraboloid of revolution
like the first reflector 1 although the curvature is different, and the peripheral edge is fixed in
contact with the peripheral ridge of the first reflector It is done. The focus of this second reflector
3 is at the position of the sound generator 2. An opening 4 having a predetermined diameter is
formed at the center of the second reflector 3.
Since the present embodiment is configured as described above, the sound generated from the
sound generation device 2 is reflected by the first reflector 1 to become parallel sound waves,
and the sound from the opening 4 of the second reflector 3 is transmitted to the outside.
Released into Since this sound wave is squeezed into a sound bundle, it locally reaches the user
opposite to the opening 11FI + 4, supplies an enlarged sound around it, and plays the role of a
hearing aid. Also, the sound wave that has not passed through the opening 4 and reaches the
second reflector 3 is reflected again, sent back to the first reflector, and further reflected and
sent out from the opening 4. Thereafter, the same operation is repeated, and the sound from the
sound generation device 2 is emitted from the opening 4 toward the user, and the expanded
sound can be retained only around the user. Therefore, it is a hearing aid that does not need
earphones for the deaf. Also, in noisy places such as coffee shops, restaurants and bars, it is
possible to selectively adjust the loudness, for example, to make the sound of a specific place
where the device is placed louder and make the sound of other places smaller. It can also be done
so as not to bother other customers. [Second Embodiment] FIG. 2 illustrates the second
embodiment of the present invention, and in the present embodiment, the third reflector 5 is
provided on the lower side of the sound generating device 2. . This third reflector 5 is also of
small diameter but is configured in a paraboloid plane, the center of which coincides with the
center of the opening 4. Also, its diameter is substantially the same as the diameter of the
opening 4. When such a structure is adopted, a part of the sound wave reflected from the second
reflector 3 or a part of the sound wave reflected from another portion is incident on the third
reflector 5 and is reflected there to be a parallel sound wave. , From the opening 4 towards the
user. By adopting the structure of the present embodiment, a sound flux can be formed more
efficiently. [Third Embodiment] FIG. 3 illustrates the third embodiment of the present invention.
In the present embodiment, a short cylindrical sound absorbing material 6 is provided on the
periphery of the opening 4 downward. ing. When such a sound absorbing material 6 is provided,
among the sound waves emitted from the opening 4, the sound waves scattered but not directed
in the linear direction are absorbed, and only the sound waves directed in the linear direction are
emitted from the opening 4, The expanded sound waves can be concentrated only in a specific
range. Fourth Embodiment FIG. 4 illustrates the fourth embodiment of the present invention. In
the present embodiment, the light source 7 is provided on the inner surface of the second
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reflector 3. The light emitted from the light source 7 is converted into parallel light by the first
reflector 1 and emitted to the outside together with the sound wave from the opening 4 while
being repeatedly reflected between the first and second reflectors.
When such a structure is adopted, the direction of the sound wave coincides with the direction of
the light ray, so that the direction of the sound wave can be understood by looking at the
direction of the light ray and the expansion direction of the sound can be understood at a glance.
[Fifth Embodiment] FIG. 5 illustrates the fifth embodiment of the present invention, and adopts
the most simplified form. That is, in FIG. 5, the one indicated by reference numeral 8 is a reflector
having a paraboloid of revolution, and the voice generator 2 is disposed at the focal point
thereof. Even if such a simple form is adopted, sound waves can be squeezed and emitted.
According to the measurement of the inventor, at a position of 1 m in the axial direction from the
sound generating device 2 and in the direction perpendicular to the axis, 80a ++ 1! At one
position, the volume drop was 30 dB. Thus, even in the simplest form, the sound wave can be
squeezed and emitted only in a certain limited place. [Effects and advantages As apparent from
the above description, according to the present invention, the principle of an acoustic lens
utilizing a paraboloid of revolution is applied, and a structure for emitting sound waves in a
specific direction is adopted. If the person is positioned in the direction of sound wave emission,
the expanded sound can be sent to the identified sky + 18 around the user, and can be used as a
hearing aid that does not require an earphone.
[0002]
Brief description of the drawings
[0003]
FIGS. 1 to 5 are side views of a crest to explain an 11 to a fifth embodiment of the present
invention.
DESCRIPTION OF SYMBOLS 1 ... 1st reflector, 2 ... sound generator, 3 ... 2nd reflector, 4 ...
opening part, 5 ... 3rd reflector, 6 ... sound absorption Material, 7 ... light emitter, 8 ... reflector.
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