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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
bone conduction conversion device, FIG. 2 is a perspective view showing one embodiment of the
bone conduction conversion device according to the present invention, and FIG. FIG. 4 is a circuit
diagram showing the transmission / reception circuit. 7 is a bone conduction transducer
according to the present invention, 11 is an elastic piezoelectric body, i 2.13 is an electrode, and
16 is a transmitting / receiving circuit.
DETAILED DESCRIPTION OF THE INVENTION First, referring to FIG. 1, a conventional bone
conduction transducer of this type will be described. (A long and thin cylindrical case is designed
to be inserted into the ear canal of the ear. (2) is a piezoelectric element for converting voice
(sound pressure) due to bone conduction into an electrical signal, one end of which is fixed inside
the case (1) and the other end is brazed with a weight (3) ing. Also, in the case (1), there is
provided a sound conduit (4) which is located at the other end of the case Kg. One end (the back
side of the ear canal) of the sound conduit (4) is open, and the other end is attached to an
earphone t53KII as an electro-mechanical transducer provided outside the case (1). (6) Is a lead
wire, and is connected to the piezoelectric element (3) and the earho U4 + // nin (5). Such a bone
conduction conversion device has a drawback that the structure is complicated because two
transducers, a piezoelectric element (2) and an earphone, are provided. In view of this point, the
present invention proposes a bone conduction converter capable of transmitting and receiving
audio signals with a simple configuration. One embodiment of the present invention will be
described below with reference to FIGS. FIG. 2 shows the state in which the bone conduction
conversion device (7) according to the present invention is inserted into the ear canal (8) of the
ear. Here, (9) indicates the auricle, and αI indicates the otobone. This bone conduction
conversion device (7) comprises a substantially cylindrical elastic piezoelectric body U having a
vibration direction in a substantially radial direction, and the electrode α'a of the elastic
piezoelectric body (as shown in FIG. 3)). The input audio signal voltage is applied and the output
audio signal W from the one-electrode az% a3 is formed 5K. The cylindrical elastic piezoelectric
material a is a bimorph in this example, in which a powder of silicon rubber KPZT (lead zirconate
titanate (Pb (Zr, Ti) On)) is dispersed. To 1! It is dielectrically polarized so as to be in the moving
direction or in the transmitting direction. Monomorphs are also possible. The electrodes a7J and
Q3 are formed on the inner and outer peripheral surfaces of the elastic piezoelectric member
111 by vapor deposition of a metal or application of a conductive paint. Further, a stopper of a
truncated cone cylindrical shape α9 is integrally attached to one end of the piezoelectric body a
by a bonding agent or the like. The stopper α9 is made of, for example, silicone rubber. The
piezoelectric body αυ is selected to have an outer diameter substantially in close contact with
the inner wall of the ear canal (8), and the stopper α9 is made to have an outer diameter
gradually increasing from the outer diameter of the piezoelectric body aυ as it goes away from
the piezoelectric body αυ. To be elected.
Next, the transmission / reception circuit 161 connected to the piezoelectric body α11K will be
described with reference to FIG. 8Wl、SW。 These are switches interlocked with each other,
and have movable contacts m and fixed contacts e, s. One of the lead wires I derived from the
electrodes 11z and α1 of the piezoelectric body αD is grounded, and the other is subjected to
the fixed contact S of the switch 8W1 and the fixed contact θKmill of the switch SW2. Switch
5Wlf) A rotary machine (31 auto V point m is connected to the input end of the amplifier (i), and
its output end is connected to the movable contact m of the switch 8W2. The input voice signal
from the voice signal source α 罎 is supplied to the input terminal (the fixed contact eK of the
switch SW1 through the In). An output terminal aδ is derived from the fixed contact S of the
switch SW2. By switching the switches 8W1 and 8Wz in this circuit (161, the manual audio
signal voltage is amplified by the amplifier 3 and supplied to the piezoelectric body (In, the
piezoelectric body Q11 is vibrated, and the piezoelectric body 0υ The output sound signal
voltage generated based on the vibration due to the sound (sound pressure) or the amplifier (2
[IK is amplified and the output terminal (I [C is output. In addition, the transmission of the signal
of this cabinet between the transmitting and receiving circuit (161 and the opposite station is
performed by wire or wirelessly. In the case of wireless communication, it is necessary to connect
a transmitter / receiver to the transmitter / receiver circuit. Next, the operation of the abovedescribed bone conduction converter (7) will be described. The piezoelectric material of the bone
conduction transducer (7) is inserted into the ear canal (8) K of the ear. When a voltage is applied
to the piezoelectric body + IDK input voice signal voltage, the piezoelectric body a vibrates in the
radial direction, and this 11 m 1 t is subjected to (4) ぃ · le blue (IIK bone conduction) to hear the
input voice. Also, the voice (sound pressure) produced by a human being who wears the bone
conduction transducer (7) on his ear is blue (IQK bone conducted) and vibrates the piezoelectric
body a, whereby an output voice signal from the piezoelectric body +111 A voltage is generated.
Also, the external sound reaches the tympanic membrane through the stopper Q51 and the
piezoelectric body (Ill's mutually connected through holes. In the case of blocking the external
sound, it may be closed by any one of the through sound absorbing or insulating materials.
According to the bone conduction conversion apparatus of the present invention described
above, transmission and reception of audio signals can be performed with a simple configuration.
Such a bone conduction converter is suitable for use in wired or wireless transceivers used in
noisy places such as factories and subways.
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