JPS5561194

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DESCRIPTION JPS5561194
Description 1, title of the invention
Electro-acoustic transducer
3. Detailed Description of the Invention The present invention relates to an electro-acoustic
transducer, and particularly to an electro-acoustic transducer for use in an ear canal, wherein an
electric signal is converted to sound pressure to be used as an eardrum. There are an earphone
etc. which transmit to the above, and an ear microphone etc. which detect vibration in the ear
canal and convert it into an electric signal as an acoustic-electric converter. This ear microphone
has a sound pressure type ear microphone that converts air vibration in the ear canal into an
electric signal, and the sound pressure generated in the ear canal is detected and converted to an
electric signal contrary to the earphone. The earphone or ear microphone as the electro-acoustic
transducer includes, for example, at least one of a conversion element that converts an electric
signal to sound pressure or a sound pressure to an electric signal, and an element storage unit
that stores the conversion element. A sound pressure conduction endpage: 1 insertion portion
provided for air conduction between the conversion element and the eardrum and having a
through hole in communication with the element storage portion, and can be inserted into the
ear canal There is. In such an electro-acoustic transducer, it is easy for earwax or dust and the
like to be mixed in the through hole of the sound pressure introducing portion, and the amount
of mixing increases, so that the conversion element to the eardrum or the eardrum to the
conversion element There is a drawback that the transmission of the sound pressure is disturbed
and the performance is easily deteriorated. The object of the present invention is to provide an
electro-acoustic transducer which overcomes the above-mentioned drawbacks. Hereinafter, the
present invention will be described in detail with reference to the attached drawings. FIG. 1 is a
cross-sectional view of one embodiment of an electro-acoustic transducer according to the
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present invention. In the figure, '1' is a conversion element for detecting sound pressure and
converting it into an electric signal, for example, and is stored in an element storage portion 2
having an opening. A sound pressure introducing portion 3 having a through hole
communicating with the element storing portion 2 is attached to an opening portion of the
element storing portion 2, and the sound pressure introducing portion 3 has a size that can be
inserted into the external ear canal. Is formed. At the opening end of the sound pressure
introducing portion 3, a net 4 for preventing the mixing of earlobes, dust and the like into the
through hole is attached with an adhesive or the like. Furthermore, a hollow adapter 6 having at
least one hole 5 in the peripheral wall at the opening end of the sound pressure introducing
portion 3 and molded by synthetic resin or the like is detachably fitted by screwing or fitting or
the like. There is. Like the net 4, the adapter 6 not only prevents contamination of the through
hole with earlobes, dust and the like, but also serves to protect the net 4. The hole 5 of the
adapter 6 is preferably formed so that its center line is located substantially on the center line
extension of the through hole of the sound pressure introducing portion 3 as shown.
Still, the adapter 6 may have a structure having a plurality of holes as shown in FIG. 2. By having
the plurality of holes, the sound pressure from the tympanic membrane is sufficient even if the
hole at the central portion is blocked for some reason. It has the advantage of being transmitted
to the conversion element 1 through the other holes. In the above-described embodiment,
although an electro-acoustic converter, ie, an ear microphone using a conversion element for
converting sound pressure into an electric signal has been described, an earphone using a
conversion element for converting an electric signal to sound positive is described. Of course it is
good. As described above in detail, by attaching the net 4 to the opening end of the sound
pressure introducing portion 3, it is possible to prevent mixing of earlobes, dust and the like into
the through hole of the sound pressure introducing portion 3. The transmission of vibration to
the pickup or tympanic membrane can be reliably performed. Further, by attaching the adapter 6
to the opening end of the sound pressure introducing portion 3, the dustproof effect can be
enhanced and the net 4 can be protected. Furthermore, since the adapter 6 can be formed into
various sizes, the size can be freely selected according to the size of the hole of the user's ear.
4. Brief description of the drawings FIG. 1 is a cross-sectional view of an embodiment of the
electro-acoustic transducer according to the present invention, FIG. 2 (a) is a cross-sectional view
showing another shape of the adapter, and FIG. FIG. Explanation of the code of the main part 1
........... Conversion element 2 ........... Element storage part 3 .......... Sound pressure of the
introduction section 4 ........... net 6 ......... adapter # / g Atsushi 2 Figure C (I! 7)EndPage:
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