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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
electromagnetic electroacoustic transducer, FIG. 2 is a top view of an essential portion of the
electromagnetic electroacoustic transducer according to an embodiment of the present invention,
and FIG. FIG. 4 ····· Diaphragm, 7, 8 ············································ Slit.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an
electromagnetic type electroacoustic transducer such as an earphone, in which the acoustic
impedance for controlling frequency characteristics can be arbitrarily varied. Conventionally, this
type of apparatus as shown in FIG. 1 includes a magnet 1, a coil 2, a magnet 3, a diaphragm 4, a
frame 6, a case 6, a first back air chamber 7, a second back air chamber 8, and a first back air
chamber. It is formed from a thin @ 9 connecting the second back air chambers 7 and 8. Here,
when controlling the same wave number characteristic, the acoustic impedance of the slit 9
connecting the first back air chamber 7 and the second back air chamber 8 may be changed. In
order to obtain a predetermined acoustic impedance e〃7 / ρ7 // ≠ 2, τ, in the slit 9 at the
time of 7 days, the diameter and the number of holes can be controlled. However, the acoustic
impedance of the slit 9 is that in the equivalent circuit from which the acoustic transformer is
removed, M is the acoustic mass, R is the acoustic resistance, n is the number of holes (caps), P is
the air tight, and μ is the air viscosity. The coefficient, t is the length of the hole, T is the radius
of the hole, and S is the effective area of the diaphragm. In an equivalent circuit, 14So2M---Pt-13P---8 · πμ · t · ( -L! T) It becomes 2, and when the radius r1 and the number n of holes are
changed, both M and R change at the same time, and each can not be changed to q. Therefore, it
was hard to get in this method to obtain the diluted M-R. The present invention eliminates such a
drawback and will be described with reference to an embodiment shown in FIG. FIG. 2 is the
frame 5. in FIG. Case 6, magnet 3. コイ ル2. Since the cross section in which the relationship
of the magnet 1 is displayed is also '4', 37 slits 1o are provided to correspond to the slits 9 in
FIG. That is, assuming that t is the longitudinal dimension of the slit 10, W is the lateral
dimension of the slit 10, and t is the length of the slit 10, the acoustic impedance when adopting
a slit 1 ° is 6802M-P't'w, to2R-12μ " It becomes like Wt3. In this case, arbitrary R is obtained
while keeping N constant by changing the ratio of t and W without changing the cross-sectional
area (W-t), ie, the peripheral length, of this 'Jy' tiger 0. be able to. That is, after setting the crosssectional area to necessary M, arbitrary R can be obtained by changing the ratio of the side of the
cross section. FIG. 3 shows changes in M and R when changing one when the cross-sectional area
of the slit 10 is constant. As apparent from the above description, according to the present
invention, it is possible to independently change the -7 acoustic resistance and the acoustic
quality castle.
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