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JPS55148287

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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 JPS55148287
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an example of a conventional
sound pressure drive type earphone, FIG. 2 is a view showing an example of a prior art
introduction type electro-acoustic transducer, and FIG. Fig. 3b is a rear view of the adapter
member according to an embodiment of the present invention, Fig. 4 is a diagram showing an
example of the frequency characteristic of the embodiment of the present invention, and Fig. 5 is
a second embodiment of the present invention. The figure which shows Example 4 of.
Explanation of symbols of major parts, 1 и и и и и и и и и и и и и и и и и и и Vibration transmission part, 3 и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и ... .... Tip.
DETAILED DESCRIPTION OF THE INVENTION The present invention functions to detect vibration
generated on the wall of the ear canal through the end portion for vibration transmission
inserted in the ear canal or to convert the predetermined signal to the wall of the ear canal. The
invention relates to an ear canal insertion type electroacoustic transducer. The earphones and
ear microphones used inserted into the ear canal have a sound pressure driven structure, and in
the case of such a device, for example, as shown in FIG. By inserting it into 7, the sound pressure
corresponding to the predetermined electrical signal is introduced into the ear canal, and the
sound pressure generated in the ear canal at the time of human vocalization is detected using
means for predetermined sound pressure detection. It is configured. In this case, in order to
sufficiently transmit and detect the sound pressure, it is necessary to airtightly contact the tip of
the case and the wall of the ear canal. For this reason, in the case of using a sound pressure
driven type earphone and ear microphone, the external ear canal is cut off from other parts of
these devices, and there is a drawback that it becomes difficult to listen to external sound. In
order to eliminate such a drawback of the sound pressure 1 drive type earphone and ear
microphone, an ear hole insertion type electro acoustic transducer such as an earphone and an
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ear microphone that performs electroacoustic conversion using a piezoelectric element is used.
This device has, for example, a shape as shown in FIG. 2, and a piezoelectric element is provided
inside the vibration transmitting portion 2 formed at the tip of the case 1 and the above vibration
is formed in a part of the ear canal wall 6 By bringing the transmission unit 2 into contact, the
acoustic imaging movement produced in the piezoelectric element by a predetermined signal
current is transmitted to the outer ear canal wall 6 to be able to be heard, or the vibration
generated in the ear canal wall 6 at the time of vocalization It is configured to detect and convert
to current. Therefore, in the case of this device, it is not necessary to airtightly insert the tip
portion of the device into the ear canal as in sound pressure, driven earphones and ear
microphones, and the vibration transfer unit 2 is brought into contact with a part of the ear canal
wall 6 Just do it. It is an advantage of the present invention that the external ear canal is not
sealed at the time of use and that external sound can be heard in the in-ear-hole type electroacoustic transducer using the piezoelectric element. However, in the case of such a device, it is
difficult to be stably held in the ear canal because it does not have a structure to be in pressure
contact with the entire inner circumference of the ear canal, and the vibration transmission with
the ear canal wall 6 becomes incomplete or drops out of the ear canal There was a drawback to
doing. It is an object of the present invention to provide an ear-hole-inserted electro-acoustic
transducer having a structure that is stably held in the ear canal and from which external sound
is not blocked. Hee, 9 ". Hereinafter, embodiments of the present invention will be described in
detail with reference to the drawings.
3- FIG. 3a-- is a partial cross-sectional view of FIG. In this figure, a cylindrical adapter made of
silicon resin, soft vinyl chloride resin, etc. is coated on the outer surface of at least the vibration
transmitting portion 2 of an air-one-hole insertion type electroacoustic transducer having a
piezoelectric element inside. It is characterized in that one member 3 is provided. The adapter 1
member 3 is attachable to and detachable from the vibration transmission unit 2. It is preferable
to prepare various external diameters and shapes according to the shape of the user's ear canal,
and to make it exchangeable as necessary. I miss you. Further, as shown in FIG. 36, the adapter
member 3 is shaped such that the outer diameter becomes a dog at its rear end, and functions to
enhance the adhesion in the ear hole when the vibration transmitting portion 2 is inserted into
the ear hole. However, this has the advantage that the transmission characteristics of the
vibration are improved at the same time as the device is stably held in the ear canal. For example,
in the case where the adapter 1 member 3 is used as compared with the frequency characteristic
shown by the solid line in the case where the ad-free member 3 is not used in the example shown
in FIG. The Q at the resonance point fO of the piezoelectric element is lowered, and the 4frequency characteristic is more flattened. This is because the resin or the like that constitutes
the adapter member 3 has a predetermined vibration absorbing characteristic, but is it possible
to obtain the desired vibration transmission characteristic by selecting the property and shape of
the adapter member 30? it can. Furthermore, the adapter 1 member 3 is provided with a vent 4
at its rear end, and it is possible to circulate outside air. Therefore, in the case where the adapter
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1 member 3 is provided, the introductory insertion type electroacoustic conversion is performed.
It is also characterized by the ability to hear external sounds even when using the vessel, with
less discord and high safety. Next, FIG. 4 shows a second embodiment of the present invention, in
the case of the example shown in this drawing, the adapter; +, ?the tip of the 141 member 3 is
different from the other parts. Produced with parts, 7 '' 1. It is characterized in that the tip
portion 5 is formed of a hard member, for example, to increase the sensitivity at the time of
vibration transmission, while the other portion is formed of a vibration absorbing member at the
resonance point of the piezoelectric element. Q can be reduced. As described above, according to
the present invention, the introductory electroacoustic 5-converter according to the present
invention has a structure having at least one adapter member covering the vibration transmitting
portion, and it is stably held in the ear canal and at the same time has vibration transmitting
characteristics. It is possible to improve and even listen to external sounds when in use.
This ear canal insertion type electroacoustic transducer can be implemented as an ear
microphone for detecting an imaging movement produced on the wall of the ear canal by the
user's vocal sound, and at the same time, drives the piezoelectric element with a predetermined
signal current. It is possible to implement as an earphone.
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