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DESCRIPTION JPH03109000

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DESCRIPTION JPH03109000
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker in which a sealed chamber is formed by a speaker component including a damper and a
magnetic circuit. [Prior Art] In a conventional speaker of a type in which a sealed chamber is
formed by a speaker component including a damper and a magnetic circuit, as shown in FIG. 3,
the magnetic circuit of the speaker 21 is disk-shaped. A top plate 1 and a disc-shaped bottom
plate 3 having a center pole 4 erected in a cylindrical shape at a central position, and provided
between the top plate 1 and the bottom plate 3 and having a predetermined outer periphery of
the center pole 4 And an annular magnet 2 disposed so as to surround at an interval, and these
respective members are integrally coupled. In the speaker 21, the magnetic circuit, the center
cap 5 disposed in front of the magnetic circuit, the diaphragm 6, the cylindrical member 7, the
damper 8, and the frame 9 seal as shown by cross hatching. A chamber 10 is formed. The voice
coil 11 wound around the outer periphery of the cylindrical member 7 is provided in the outer
periphery of the rear end of the cylindrical member 7 located in the gap of the magnetic circuit.
The inner peripheral ends of the diaphragm 6 and the damper 8 whose outer peripheral ends are
supported by the frame 9 are fixed to the front outer peripheral part and the middle outer
peripheral part of the cylindrical member 7, respectively. . In the above structure, when a voice
signal current is applied to the voice coil l = 1, the voice coil 11 is driven by interaction with the
magnetic field generated by the magnet 2 in the magnetic circuit to generate vibration, The
vibration is transmitted to the diaphragm 6 through the cylindrical member 7 and emitted as a
sound wave. [Problems to be Solved by the Invention] However, in the above-mentioned
conventional structure, when a voice signal current is applied to the voice coil 11, Joule heat is
generated in the voice coil 11, and the generated Joule heat causes the inside of the magnetic
circuit. The pressure changes in the closed chamber lo. This pressure change becomes larger as
the rigidity of the speaker constituent member including the damper 8 forming the closed
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chamber 1o and the magnetic circuit is larger, so that the volume change in the closed chamber
lo is reduced. Then, the load of the pressure change is concentrated on the most flexible damper
8 among the speaker components forming the closed chamber 10, and as a result, the dampers
are temporally accumulated in the process of repeating the pressure change. Induce plastic
deformation to 8. Therefore, a shift occurs in the relative positional relationship between the
cylindrical member 7 connected to the inner peripheral end of the damper 8 and the center ball
4, causing vibration abnormality or the like to the diaphragm 6 connected to the cylindrical
member 7, There was a problem such as a reduction in sound quality.
[Means for Solving the Problems] In order to solve the above problems, in the speaker according
to the present invention, a sealed chamber is formed by a speaker component including a damper
and a magnetic circuit, and a voice coil is driven in the sealed chamber. In the speaker, it is
characterized in that an elastic film having flexibility more than the damper is interposed on a
part of the peripheral wall of the sealed chamber facing the sealed chamber. The elastic film is
made of, for example, a material having properties such as rubber. [Operation] According to the
above configuration, since a part of the peripheral wall of the closed chamber faces the closed
chamber and the elastic film having flexibility more than that of the damper is interposed, the
audio signal current is applied. Even if the voice coil generates heat and the pressure in the
sealed chamber changes, the elastic film undergoes large deformation with a small stress, so the
pressure in the sealed chamber is approximately equal pressure expansion of the volume in the
sealed chamber. The change can be reduced. As a result, since the influence of the concentrated
pressure change on the damper is avoided, it is possible to prevent the plastic deformation of the
damper and the relative positional deviation between the cylindrical member and the center ball
and the deterioration of the sound quality. An embodiment of the present invention will be
described below with reference to FIGS. 1 and 2. FIG. For the sake of convenience of explanation,
the same reference numerals will be additionally given to constituent members having the same
functions as the members shown in Conventional Example 1. As shown in FIG. 1, the magnetic
circuit of the speaker 20 comprises a disc-like top plate 1, a disc-like bottom plate 3 in which a
cylindrical center ball 4 is erected at a central position, and the top plate 1 and an annular
magnet 2 provided between the bottom plate 3 and disposed so as to surround the outer
periphery of the center ball 4 at a predetermined interval, and these respective members are
integrally coupled It has a configuration. On the front end face of the top plate 1, the inner
peripheral end side of the frame 9 for protecting each component inside the speaker 20 is fixed
to be attached. On the outer peripheral end side of the frame 9, an edge supporting portion 9a
having an annular flat surface shape is formed, and an outer peripheral portion of the annular
edge member 12 is fixed. The inner peripheral portion of the edge member 12 is connected to
the outer peripheral portion of the diaphragm 6 in a cone shape, whereby the outer peripheral
portion of the diaphragm 6 is supported by the frame 9 via the edge member 12. The inner
peripheral portion of the diaphragm 6 is connected to the outer peripheral portion of the front
end side of the cylindrical member 7, whereby the cylindrical member 7 is suspended by the
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diaphragm 6. The cone-shaped central portion of the diaphragm 6 is opened, and the center cap
5 is attached in the vicinity of the inner peripheral side of the diaphragm 6 so as to close the
opening.
The rear portion of the cylindrical member 7 is located in the gap formed between the center ball
4 and the top plate 1, and the voice coil 11 is wound around the rear outer peripheral portion of
the cylindrical member 7. Further, a damper supporting portion 9 b having an annular flat
surface shape is formed in a stepped shape in the vicinity of the inner peripheral side of the
frame 9, and the damper supporting portion 9 b formed inside the frame 9 has flexibility. The
outer peripheral portion of the annular elastic film 13 having the above is fixed. A flexible
damper 8 is provided between the inner peripheral portion of the elastic film 13 and the outer
peripheral portion of the cylindrical member 7, and the elastic film 13 and the damper 8 are
horizontally disposed, and , Which faces the closed chamber 10 described later. The elastic film
13 is at least more flexible than the damper 8 and is made of, for example, a material having
properties such as rubber. Further, the connection portion between the outer peripheral portion
of the damper 8 and the inner peripheral portion of the elastic film 13 is provided by a mounting
ring 14 provided on a ring support portion 9 c formed by bending the inner peripheral end of the
frame 9 inward. It is supported from below and the installation is fixed. As shown in FIGS. 2 (a)
and 2 (b), the mounting ring 14 radially penetrates a plurality of air holes 15 so that the inner
peripheral side and the outer peripheral side of the mounting ring 14 communicate with each
other. It is formed. Then, a cross hat in FIG. 1 is formed by the above-described magnetic circuit
and a speaker constituting member including the center cap 5, a part of the diaphragm 6, the
cylindrical member 7, the damper 8, the elastic film 13 and the part of the frame 9. A closed
chamber 10 of the airspace as shown in the figure is formed. In the above configuration, when a
voice signal current is applied to the voice coil 11, the voice coil 11 vibrates due to the
interaction with the magnetic field of the magnet 2 formed in the back and forth direction in the
voice coil 11, and the cylindrical member 7 In order to vibrate integrally with the voice coil 11,
the vibration is transmitted to the diaphragm 6 connected to the cylindrical member 7, and a
sound wave is emitted from the diaphragm 6. By the way, when a voice signal current is applied
to the voice coil 11, Joule heat is generated, which causes the air in the closed chamber 10 to
expand and causes a pressure change. In the conventional speaker, the pressure change can not
but be adjusted by deformation of the most flexible damper 8 among the components forming
the peripheral wall of the sealed chamber 10 due to the pressure change. According to the above,
since the elastic film 13 having flexibility more than the damper 8 faces the closed chamber IO
and is interposed between the damper 8 and the damper support portion 9b, the pressure
change in the closed chamber 10 is elastic. As a result of the membrane 13 being deformed more
than the damper 8, the burden of concentrated pressure change on the damper 8 is eliminated,
and the attachment ring 14 supporting the connecting portion between the damper 8 and the
elastic membrane 13 from below Since a plurality of air holes 15 ... formed radially are formed
and the inner peripheral side and the outer peripheral side of the mounting ring 14 are
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communicated, the elasticity II!
The pressure adjustment of the enclosed chamber 10 is enabled by 13. Specifically, when the
inside of the closed chamber 10 of the speaker 20 is room temperature T, the pressure in the
closed chamber 10 is Po, the volume is V, and the voice coil 11 generates heat and the
temperature in the closed chamber 10 is When T + (T I> T o ′), the pressure in the closed
chamber 10 in the conventional speaker 21 is P 1, the volume is VB, and the pressure in the
closed chamber 10 in the speaker 20 of the present invention is P 3, Assuming that the volume is
v2, the following equation is established by Boyle-Charles's law. Thus, as the elastic modulus of
the member forming the peripheral wall of the sealed chamber 10 is smaller and the flexibility is
larger, the volume ■ in the sealed chamber 10 is thicker (the pressure P in the sealed chamber
10 is decreased, P, Produces effects close to That is, in the case of the speaker 20 of the present
invention, the volume {circle over (1)} in the enclosed chamber 10 is approximately equalpressure expanded by the elastic film 13 being largely deformed by a small stress. P +> PgζP,: V,
<V, (2) (However, according to the equations (1) and (2), V2 = vo x T + / To) After all, in the
speaker 20 of the present invention, the closed chamber 10 The pressure change inside is
reduced (ie, from the equation (2) Pz-P +! =io)。 As a result, the influence of the pressure
change applied to the damper 8 can be removed. In the present embodiment, although the
configuration in which the elastic film 13 is interposed between the damper 8 and the damper
support 9 b is illustrated, the present invention is not limited thereto. For example, an elastic film
may be interposed between the cylindrical member 7 and the damper 8 Alternatively, for
example, a part of the center cap 5 may be interposed with an elastic film, which are included in
the scope of the present invention. As described above, in the speaker according to the present
invention, the sealed chamber is formed by the speaker constituent member including the
damper and the magnetic circuit, and the above-mentioned sealed speaker in which the voice coil
is driven in the sealed chamber. An elastic film that is more flexible than the damper is
interposed on a part of the peripheral wall of the chamber facing the closed chamber. Thereby,
the influence of the pressure change in the sealed chamber applied to the damper can be
removed, and the relative positional deviation between the cylindrical member on which the
voice coil is disposed and the center ball is prevented, and the vibration coupled to the cylindrical
member The effect of being able to avoid the sound quality deterioration due to the abnormal
vibration of the board and the like can be achieved.
[0002]
Brief description of the drawings
[0003]
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1 and 2 show an embodiment of the present invention.
FIG. 1 is a longitudinal sectional view showing a speaker. FIG. 2 (a) is a plan view of a mounting
ring incorporated in the speaker, and FIG. 2 (b) is a front view thereof. FIG. 3 is a longitudinal
sectional view showing a conventional speaker. 1 is a top plate, 2 is a magnet, 3 is a bottom plate,
4 is a center ball, 5 is a center cap, 6 is a diaphragm, 7 is a cylindrical member, 8 is a damper, 9
is a frame, 1 is a closed chamber, and ll is a voice A coil, 13 is an elastic membrane, 14 is a
mounting ring, and 15 is an air hole.
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