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DESCRIPTION JPS57198178

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DESCRIPTION JPS57198178
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the structure of a conventional
earphone, and FIG. 2 is a view showing the structure of a headphone according to the present
invention. 6 is a ceramic vibrator, 10 is a support, and 12 is a case.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a headphone
using a ceramic vibrator. In general, ceramic vibrators are used exclusively as vibrators for
earphones, but as shown in FIG. 1, the structure is such that as shown in FIG. 1, facing corner
portions of one rectangular ceramic vibrator (1) 2) The arm portion l (2a), (2b) is supported, and
the other facing corner portion is fixed to the arm portion (8a), (3b) of the substantially Y-shaped
connector (3), and the connector (3) Such a conventional structure has a structure in which the
other end is fixed to one core of a cone-shaped diaphragm (5) whose outer peripheral portion is
identified in a case (4). C) (379 / i '/ 2)) is fixedly supported by the support (2), so that the lowest
resonance frequency of the ceramic vibrator (1) is high (4 to 5 KH2' in a normal earphone).
There is a disadvantage that the band is narrow, and the ceramic vibrator (1) has a specific
frequency In order to sharpen the resonance, there is a disadvantage that produce peaks and
dips on the sound pressure frequency characteristics. The present invention adopts the abovedescribed ceramic vibrator for the first time in a horn and solves the above-mentioned
drawbacks, which will be described below with reference to the drawings. In FIG. 2, (6) A ceramic
vibrator in which circular ceramic vibrators (8) and (8) are attached to both sides (or one side) of
a Fi circular electrode (7). Attach a braking body (9) such as neobrene rubber to both sides (or
one side) of The outer peripheral portion of the ceramic vibrator (6) is embedded in the concave
groove r11 of the ring-shaped support (10) made of a viscoelastic body such as neoprene rubber,
and the cylindrical case (I) is inserted. It has a structure supported by 12). In this example, the
diameter of the ceramic vibrator is 25 eyes, the thickness of the electrode is 0.1i + i +, the
thickness of the ceramic resonator element is 80 microns, and the thickness of the damping
member is 11111I, the lowest resonance. The frequency measured was in the range of 700-800
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H2. As described above, according to the present invention, since the ceramic vibrator (6) is used
as the direct sounding body and the outer peripheral portion of the ceramic vibrator (6) is
elastically supported by the support (10) made of a viscoelastic body, Since the stiffness is
reduced and the lowest resonance frequency is lowered, the reproducible frequency band is
significantly expanded, and the resonance of the ceramic vibrator (6) is effectively absorbed and
damped by the damping body (9) and the support (10) Therefore, there is an advantage that the
peak and dip on the sound pressure frequency characteristic are suppressed and the frequency
characteristic is obtained.
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