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JPS5713892

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DESCRIPTION JPS5713892
Description 1, title of the invention
Barrier pull chamber type headphone
3. Detailed Description of the Invention The invention relates to a barrier pull type headphone.
Such headphones have conventionally been generally configured as shown in FIG. 1 and FIG. In
the figure, reference numeral 1 denotes a base having a substantially cylindrical shape, in which
a support portion 1a is provided concentrically supported by a connecting portion 1b. On the
inner periphery of the base 1 with a braking mesh 05, to which the vibration system including
the diaphragm 2 and the voice coil 3 and the magnetic circuit including the permanent magnet 4
are attached. It is provided in the opening I [lii] formed by the outer periphery of the support
portion 1a and the connecting portion 1b. A damping film 6 is formed of an elastic material
annularly formed with a bellows, and is provided so as to define a barrier pull chamber S by
closing between the base 1 and the support portion 1a. γ is an ear pad provided on the base 1
on the side opposite to the side on which the damping film 6 is provided, 8 is a protective plate
attached to the support portion 1 b to protect the diaphragm 2 from the outside, 9f ′ i voice coil
It is a dumpling of three. The barrier pull type head EndPage: 1 dophone of the configuration as
described above guides a part of the sound pressure generated by the vibration of the diaphragm
2 to the barrier pull chamber by the damping membrane 6 through the damping mesh 5 and
controls it. Therefore, the damping film 6 is intended to improve the sound pressure
characteristics, but the damping film 6 has a portion that receives the action of the sound
pressure of the diaphragm 2 directly through the damping mesh 5 and a portion that is not.
There is a problem that movement of different phases occurs in the inner part of the mike 6,
movement 6, and the sound pressure custom order of the headphones is deteriorated. The
present invention has been made in view of the above-described point of the invention, and an
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object thereof is to provide a barrier pull chamber type headphone in which the characteristic is
improved by suppressing the abnormal vibration axis of the damping film. An embodiment of the
present invention will be described below with reference to FIGS. 3 to 5. The same reference
numerals as in FIGS. 1 and 2 denote the same parts in FIG. 10Vi is a lip provided according to the
present invention, and is provided so as to project from the main edge of the base 1 to the
support portion 1a at the central portion of the connection portion 1b opposed to the damping
film 6. A damping film 6 is fixed to the lip 10 by stratification or the like. Thus, by fixing the
portion of the damping film 6 where the sound pressure of the diaphragm 2 does not act on the
K via the damping mesh 5, occurrence of abnormal resonance of the damping film 6 is
suppressed, as shown in FIG. Such custom improvement is measured. That is, the portion X of the
characteristic deterioration corresponding to the characteristic of the conventional headphone
indicated by the broken line is removed in the% note of the present invention indicated by the
solid line.
The above-mentioned lip need not protrude from the rest of the base 1 to the support portion 1a,
and a short lip 10 'as shown in FIG. 5 is a portion of the damping film 6 having the largest
reverse phase amplitude. The same effect as in the case of the lip 1o of FIG. 4 can be obtained by
fixing the damping film 6t to the damping film 6t. Further, in the illustrated embodiment, the
number of the connecting portion 1b connecting the supporting portion 1λ to the main body of
the base 10 is one, but the present invention can be applied to the case of two or more. A lip is
provided at the connecting portion 1b. As described above, since the present invention fixes the
braking 1 part that does not receive the action of the sound pressure of the diaphragm directly,
the abnormal resonance of the braking film is suppressed, and this is conventionally aggravated
by this abnormal resonance. It has an extremely effective effect that the sound pressure
frequency characteristics that have been improved can be improved by simple means.
1 and 2 show prior art examples, FIG. 1 is a cut (8) view, FIG. 2 is a partially cut back concave
view, and FIGS. 3 to 4 are not shown. 3 shows an embodiment of the invention, FIG. 3 is a crosssectional view, FIG. 4 is a partially broken back view, FIG. 5 is another back view showing
another embodiment U, and FIG. 6 is a custom made according to the present invention It is a
graph shown comparing with an example. 2 ... diaphragm 6 ... damping film 10.10 '... lip S ...
barrier full chamber Patent applicant Pioneer Corporation EndPage: 2
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