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JPS55144484

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS55144484
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an example of a
conventional ear canal type electroacoustic transducer, FIG. 2 is a view showing a method of
using the conventional ear canal type electroacoustic transducer, and FIG. Fig. 4 is a perspective
view showing an embodiment of the invention, Fig. 4 is a vertical sectional view of the ear canal
type electroacoustic transducer shown in Fig. 3, and Fig. 5 is a perspective view showing a
second embodiment of the present invention. 6 is a sectional view of the embodiment shown in
FIG. 5, and FIG. 7 is a view showing how to use the ear canal type electroacoustic transducer
according to the present invention. Description of symbols of major parts, 1 и и и и и и и и Casing
member, 1 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии From
DETAILED DESCRIPTION OF THE INVENTION The present invention uses an ear canal type
electroacoustic transducer for detecting vibration generated in the wall of the ear canal by using
a piezoelectric element, or for converting sound of a predetermined electric signal and
transmitting it to the wall of the ear canal. About. There is an ear microphone as a device for
detecting human generated sound in the ear canal, and an earpiece that transmits acoustic
vibration to the wall of the ear canal using a piezoelectric element. These ear canal type
electroacoustic transducers are 1-// It is necessary to make the vibration direction of the
piezoelectric element provided at the inside of one end of the casing member inserted into the
ear canal coincide with the position where the bone vibration is likely to occur in the wall of the
ear canal. This is usually a flat plate having a structure in which the piezoelectric element is
formed by winding a piezoelectric crystal by a ceramic plate or the like, and the sensitivity in the
vibration direction perpendicular to the surface is, for example, 2 to 3 times higher than the
sensitivity in other directions. The conventional ear canal type electroacoustic transducer has a
shape as shown in FIG. 1, for example, and has a casing member ~ '>'%, from the outer shape of 1.
Direction ? of the piezoelectric element provided inside. , And 9 could not be confirmed.
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Therefore, when one end of the casing member 1 is inserted into the ear hole as shown in FIG. 2,
the direction of the internal piezoelectric element is not constant, and the sensitivity is
significantly reduced. There was a case to do. The present invention can easily confirm the
direction of the piezoelectric element provided inside the casing member of the ear canal type
electroacoustic transducer, and when inserted into the ear canal, the position of the bone
vibrating portion of the wall of the ear canal and the piezoelectric element It is an object of the
present invention to provide an ear canal type electroacoustic transducer capable of always
obtaining a high sensitivity acoustic conversion performance by matching the vibration direction.
Next, an embodiment of the present invention will be described in detail with reference to the
drawings. FIG. 3 shows an embodiment of the present invention, in which a plate-like
piezoelectric element (not shown) as an electroacoustic transducer is provided inside the tip 1 'of
the case microphone 1 of the ear microphone or earphone. ) Is placed on the back l ?of this
caseong member 1; 47-is provided with a lead wire extraction hole 3 for drawing out the lead
wire. The lead wire lead-out hole 3 is provided eccentrically with respect to the center of the back
surface 1 ? ?, and is characterized in that the eccentricity direction of the lead wire lead-out
hole 3 is perpendicular to the surface of the piezoelectric element. FIG. 4 shows the vertical cross
section of the ear canal type electroacoustic transducer shown in FIG. 3. In this figure, in
particular, the direction of the surface of the piezoelectric element 2 and the lead wire provided
on the caning member 1 The piezoelectric element 2 whose positional relationship with the hole
3 is clearly shown has a characteristic of easy vibration in the vertical direction in the drawing,
and the sensitivity 3-degree in this direction is high.
The lead wire lead-out hole 3 provided on the back surface 1 ? ? of the dimension bonding
member 1 is located below with respect to the center of the back surface 1 ? ?, and is eccentric
in the vibration direction of the piezoelectric element 2. Also, FIG. 5 shows another embodiment
of the present invention. In the case of this embodiment as well, the lead wire lead-out holes 3
are provided eccentrically as in the above embodiment, but as is clearly shown in FIG. The ear
canal type electroacoustic transducer according to the present invention is characterized in that
it is easy to handle because it is dropped, and its holding performance is stable when inserted
into the ear canal etc. If the vibration direction of the piezoelectric element inside can be easily
confirmed by the position of the hole, it can be -514, but when using the ear canal type
electroacoustic transducer according to the present invention, the tip portion 1 'of the casing
member 1 is in the ear hole The insertion detects the vibration of the wall of the ear canal, and
transmits the sound vibration due to a predetermined signal current to the wall of the ear canal.
For example, as shown in FIG. 7, by pointing the casing member 1 so that the lead wire lead-out
hole 3 is located at the lower side, bones through the tip 1 'in contact with the lower surface of
the ear canal wall 4 The sensitivity at the time of detection of vibration and transmission of voice
vibration can be maintained at a high level at all times, and it is possible to prevent the decrease
in sensitivity due to the insertion direction into the ear canal in the conventional case. In the
above embodiment, a flat plate is used as the piezoelectric element and the lead wire lead-out
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hole is eccentrically provided in the direction perpendicular to the surface of the piezoelectric
element. However, the present invention is limited to this. With regard to piezoelectric elements
of various shapes, it is recommended that the lead wire of the casing member be drawn
eccentrically in the direction in which the piezoelectric element easily vibrates, thereby providing
the position of maximum sensitivity when inserted into the ear canal Can be confirmed. Although
the ear canal type electroacoustic transducer according to the present invention can be
implemented as an earphone or an ear microphone, it is possible to easily confirm the insertion
direction into the ear canal as described above when using these devices alone. In addition to the
advantages that can be achieved, the direction of the piezoelectric element in the casing member
in the process of manufacturing these devices when the present invention is implemented in an
earpiece, an ear microphone, etc. As in the prior art, it is not necessary to perform assembly work
while confirming the direction of the piezoelectric element by providing a hole for confirming the
case where the back cover of the casing member has been removed, as in the prior art. There is
an advantage that can be simplified.
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