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DESCRIPTION JPS57160283

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DESCRIPTION JPS57160283
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a preferred embodiment of the present
invention, FIG. 1 is a vertical cross-sectional side view of a helmet with a speaker mounted
thereon according to the present invention, and FIG. 2 shows the inner structure of the speaker
FIG. In the drawings, reference numeral 1 denotes a helmet, 2 a speaker, 2 a speaker case, 5 a
speaker unit, 6 a front duct, and 7 a rear duct.
The present invention relates to a speaker mounted on a helmet, and more particularly to a
helmet speaker mounted on a helmet together with a microphone. Conventionally, in order to
contact other people during driving, a helmet equipped with a transmission microphone and a
reception speaker is provided. In this way, in the conventional one in which both the microphone
and the speaker are mounted in the helmet, "/ (6d / rJ14υj +: -) acceptable? '·' Increases the
volume emitted from the loudspeaker and has an acoustically favorable characteristic, since the
frequency characteristic near the microphone is equal to the frequency characteristic near the
speaker, a beat phenomenon, - · · wringing occurs in the vicinity of the microphone . For this
reason, in the related art, in order to prevent howling from occurring in the vicinity of the
microphone, it was not always possible to receive the sound under optimal acoustic conditions,
such as the volume of the speaker has to be reduced. In consideration of the problems as
described above, the present inventor made the present invention in order to effectively solve the
problem, and its object is to accommodate the speaker unit in the speaker case and to receive the
speaker unit from the front side of the speaker unit A front duct for guiding the sound emitted to
the ear and a rear duct for guiding the sound coming out of the rear surface of the speaker unit
to the ear are integrally extended from the speaker case in the same direction, for example, so
that the frequency characteristics in the vicinity of the speaker are acoustics Even if it is
preferable, it does not cause howling near the microphone 2 - 15 υ lying to provide a helmet
speaker. BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows the interior of a helmet to
which the speaker according to the present invention is attached. When the driver wears the
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helmet 1, the speaker 2 for reception is mounted on the inner surface of the helmet 1 near the
driver's ear The transmission microphone 3 is secured to the lower part of the front face of the
helmet 1. FIG. 2 shows the internal structure of the speaker 2, hv, the speaker 2 is a speaker case
4, and inside the speaker case 4 A speaker unit 5 to be housed, and a front duct 6 and a rear duct
7 for sound propagation integrally extended from the speaker case 4. In other words, the speaker
case 4 has a substantially cylindrical shape in which the height of the peripheral wall is different
at both ends, and a partition wall 4 c in which the lower end part is separated from the bottom
surface 8 of the case 4 is arranged between the high peripheral wall 4 a and the low peripheral
wall 4 b ing. Then, between the partition wall 4c and the peripheral wall 4a, the spider 16 little
one cannon 5 is held.
In other words, the speaker unit 5 is contact-fixed to the electrostrictive element 9 which is
excited by the application of the pulsating voltage and is vibrated by the excitation of the
electrostrictive element 9, clamped to the tip circumference of the cone 10 The diaphragm 12 is
attached via the member 11, and the sandwiching member 11 is fitted to the inner peripheral
surface of the peripheral wall 4 a and the partition wall 4 </ b> C so that the speaker unit 5 is
integrally supported by the case 4. A front duct 6 for guiding the sound coming out of the front
face of the speaker unit 5 to the ear of the driver is extended from the upper end opening 13 of
the case 4 formed by the peripheral wall 4a and the partition wall 4C to the side, 4 b and the
partition wall 4 </ b> C, a rear duct 7 for guiding the sound from the rear surface of the speaker
unit 5 to the ear is extended from the upper end opening portion 14 of the case 4. Thus, the front
duct 6 and the rear duct 7 extend in the same direction, and the portion constituting the lower
surface of the front duct 6 and the portion constituting the upper surface of the rear duct 7 are
used in common, and the front duct 6 further includes a rear duct The length is slightly longer
than that of 7 and the diameter is also larger, 4 to 17 t,. In the above, when sound is generated
from the speaker 2, the sound coming out of the front face of the speaker unit 5 is depicted by
the front duct 6, and the sound coming out of the rear face of the speaker unit 5 by the rear duct
7 is husband? The frequency characteristics in the vicinity of the speaker and the frequency
characteristics in the vicinity of the microphone are different from those in the case where one
duct is provided. As a result, even if the voltage applied to the electrostrictive element 9 is
increased to increase the sound derived from the speaker unit 5, there is no possibility of
howling occurring in the vicinity of the microphone 3. It should be noted that the above is merely
one example of the present invention, and the shapes of the front duct and the rear duct are not
limited to the above, but arbitrary. In short, the frequency characteristic in the vicinity of the
speaker is acoustically preferable As long as the frequency characteristic that does not cause no
wooling near the microphone, that is, the characteristic that there is no extreme peak. According
to the present invention as described above, according to the present invention, the inner case of
the speaker 5 - 18 having the speaker unit built in the helmet is mounted and the front duct for
guiding the sound emitted from the front face of the speaker unit to the ear of the speaker case,
And a rear duct for guiding the sound coming out of the rear surface of the unit to the ear, so
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that by properly selecting the shape and size of the front duct and the rear duct, the phase of the
sound wave from the front surface and the phase of the sound from the rear surface It is possible
to arbitrarily control the phase of the acoustic waves and to change the frequency characteristics
according to the distance from the speaker and to make the frequency characteristic near the
ears acoustically and at the same time - Frequency characteristic that makes it difficult for the
above-mentioned problem to occur, and furthermore, the above is a simple With an equal great
advantages achievable by forming and fabrication easy member.
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