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DESCRIPTION JP2006101367

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DESCRIPTION JP2006101367
The object of the present invention is to solve the problem that, for a speaker for a mobile phone
etc., the central part of the diaphragm is vibrated more than necessary to deteriorate the
characteristics and the high input resistance is difficult because the elasticity in the central part
in the longitudinal direction is low. An object of the present invention is to provide a speaker that
can uniformly vibrate even in the shape of a diaphragm and realize excellent performance and
high input resistance. The voice coil 4 comprises a frame 3 to which a magnetic circuit having a
magnetic gap 2a is coupled, and a diaphragm 5 to which a voice coil 4 closely disposed above the
magnetic gap 2a is coupled. A central portion of diaphragm 5 is required by a structure in which
a coil of a plurality of turns is wound and formed on a resin film by copper plating, and a dummy
coil not electrically connected to the coil is provided inside the wound coil. By suppressing the
above-mentioned amplitude, the whole can be uniformly oscillated, and excellent performance
and high input resistance can be realized simultaneously. [Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker used for various audio devices, electronic devices,
mobile phones and the like.
[0002]
In recent years, with regard to small electronic devices and mobile phones, while further
miniaturization has progressed, higher sound quality has also been required, and the speakers
mounted on such devices have also been made thinner, Slimming and high sound quality are
required.
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[0003]
FIG. 6 is a cross-sectional view showing the configuration of a conventional slim speaker of this
type, and FIG. 7 is a plan view showing a voice coil used for the same speaker, which the
applicant proposed as a slim speaker It is a thing.
[0004]
In FIGS. 6 and 7, reference numeral 20 denotes a first magnet, and reference numeral 21 denotes
a first yoke coupled to the first magnet 20, thereby providing a first magnetic circuit provided
with a first magnetic gap 20a. 22 are configured.
Reference numeral 23 denotes a first frame coupled to the first yoke 21 at its center, and
reference numeral 23 a denotes an air hole provided in the first frame 23.
Reference numeral 24 denotes a diaphragm, and 24a denotes an edge provided on the
diaphragm 24. The peripheral edge of the diaphragm 24 is coupled to the peripheral edge of the
first frame 23.
A voice coil 25 is coupled to the diaphragm 24. The voice coil 25 is wound in a plurality of turns
in a shape corresponding to the first magnetic gap 20a.
[0005]
A second magnetic circuit 26 is disposed symmetrically with the first magnetic circuit 22 so as to
sandwich the diaphragm 24 and, like the first magnetic circuit 22, a second magnetic circuit is
disposed at the center of the second yoke 27. The second magnetic gap 28 a is provided by
coupling the second magnet 28, and the second magnetic circuit 26 is coupled to the center of
the second frame 29. Reference numeral 29 a denotes an air hole provided in the second frame
29.
[0006]
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The reference numeral 25a denotes a lead wire for external drawing respectively connected to
the start and end of the voice coil 25. One end of the lead wire 25a is soldered to a terminal (not
shown) connected to the first (or second) frame 23. Are configured to connect.
[0007]
In the conventional speaker configured as described above, the first magnet 20 and the second
magnet 28 are magnetized in the thickness direction and in the direction in which each repels,
and the first magnetic gap 20a and the second magnetic By arranging the voice coil 25 at a
position where the leakage magnetic field generated from each of the gaps 28a can be maximally
utilized, the voice coil 25 vibrates up and down by inputting a voice signal to the voice coil 25,
whereby the voice coil 25 The coupled diaphragm 24 was configured to amplitude and perform
sound reproduction.
[0008]
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known.
JP 2004-88739 A
[0009]
However, in the above-described conventional speaker, vibration is caused because the first (or
second) magnetic circuit 22 and the voice coil 25 have a rectangular shape (the same is true
whether the shape is oval, oval or track). The plate 24 is also necessarily formed in the same
shape, and as a result, the central portion in the longitudinal direction of the diaphragm 24 has
an inherent problem that the elasticity is smaller than that at both ends.
[0010]
For this purpose, when the voice signal is input to the voice coil 25 and the diaphragm 24 is
made to oscillate by the magnetic field generated from the first (or second) magnetic gap 20a to
reproduce the sound, the entire diaphragm 24 is uniform. The characteristic is that a
phenomenon occurs in which only the longitudinal central portion, which has small elasticity
compared to the both ends, is oscillated more than necessary (generally called drum movement),
instead of the amplitude with a long stroke. In addition, it has a fatal problem that high input
resistance can not be achieved because a predetermined input can not be applied.
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[0011]
The present invention solves such conventional problems, and even in the case of using a
diaphragm having a rectangular shape or the like, the entire diaphragm vibrates uniformly, and a
speaker capable of realizing excellent performance and high input resistance. The purpose is to
provide
[0012]
In order to solve the above problems, the present invention provides a magnetic circuit having a
magnetic gap formed by coupling a magnet and a yoke, a frame in which the magnetic circuit is
coupled, and a noncontact with the magnetic gap above the magnetic gap. The voice coil and the
voice coil which are arranged close to each other in a state, and the voice coil are combined, and
the outer peripheral portion is a diaphragm connected to the frame, the diaphragm and the voice
coil, the shape of the magnetic gap is rectangular, oval, oblong In the speaker having a track
shape, the voice coil is formed by winding a multi-turn coil by copper plating on a resin film, and
the coil is electrically connected to the inside of the wound coil. A dummy coil is provided.
[0013]
As described above, in the speaker according to the present invention, the dummy coil which is
not electrically connected to the coil is provided inside the coil of the voice coil, and the rigidity is
increased by the dummy coil. As a result, the voice coil is coupled The inherent problem that the
elasticity of the diaphragm becomes large and the elasticity becomes smaller at the central
portion in the longitudinal direction of the rectangular or other shaped diaphragm as in the prior
art is eliminated, and the whole diaphragm is uniformly made It is possible to obtain the special
effect that it is possible to simultaneously achieve excellent performance and high input
resistance due to the amplitude.
[0014]
First Embodiment The first and second embodiments of the present invention will be described
below with reference to the first embodiment.
[0015]
FIG. 1 is a cross-sectional view showing the configuration of the speaker according to
Embodiment 1 of the present invention, FIG. 2 is a plan view showing a voice coil used for the
speaker, and 1 is a magnetic metal in FIGS. A rectangular first yoke 2 made of a material is a
rectangular first magnet, and a first magnetic circuit is formed by fitting and connecting the first
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magnet 2 into the first yoke 1. A first magnetic gap 2a is formed between the inner wall surface
of the first yoke 1 and the outer peripheral surface of the first magnet 2 with a rectangular
uniform gap.
[0016]
Reference numeral 3 denotes a first frame coupled around the first yoke 1 constituting the first
magnetic circuit, which is formed of a resin, a metal material or the like.
[0017]
A voice coil 4 has a rectangular pattern of a coil 4b of a desired pattern by copper plating on the
surface of the substrate 4a made of polyimide (which is also formed on the back in the present
embodiment). The coil 4b wound in a rectangular shape and wound in a rectangular shape is
formed in substantially the same shape as the first magnetic gap 2a provided in the first
magnetic circuit.
Reference numeral 4c denotes a dummy coil formed in a portion inside the coil 4b where the coil
is not formed. The dummy coil 4c is not electrically connected to the coil 4b, and is substantially
at the center in the longitudinal direction. Similar to the coil 4b, it is formed by copper plating.
[0018]
Reference numeral 5 denotes a rectangular diaphragm made of resin. The diaphragm 5 has a flat
plate-like main body 5a at the center, an edge 5b at the periphery of the main body 5a, and a flat
at the periphery The attachment part of the shape is formed by integral structure.
[0019]
6 is a rectangular second yoke made of a magnetic metal material, 7 is a rectangular second
magnet, and the second magnet 7 is fitted in and coupled to the second yoke 6 to A second
magnetic gap 7a is formed, which constitutes a magnetic circuit of No. 2 and has a rectangular
uniform gap between the inner wall surface of the second yoke 6 and the outer peripheral
surface of the second magnet 7 .
[0020]
A second frame 8 is coupled to a center of the second yoke 6 constituting the second magnetic
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circuit, and is formed of a resin, a metal material or the like. The second frame 8 and the second
magnetic circuit are By being disposed opposite to each other through the diaphragm 5, the
bonding portion of the peripheral edge of the diaphragm 5 is coupled so as to be sandwiched
between the peripheral edge of the first frame 3 and the peripheral edge of the second frame 8;
The voice coil 4 coupled to the diaphragm 5 is arranged at a substantially intermediate position
between the first magnetic gap 2a and the second magnetic gap 7a.
[0021]
In the speaker according to the present embodiment configured as described above, by providing
the dummy coil 4 c not electrically connected to the coil 4 b inside the coil 4 b of the voice coil 4,
the dummy coil 4 c increases the rigidity. Therefore, as a result, the elasticity of the diaphragm 5
to which the voice coil 4 is coupled is increased, and the elasticity in the central portion in the
longitudinal direction of the diaphragm 5 having a rectangular shape or the like as in the prior
art is smaller than that at both ends. As a result, it is possible to obtain the special effect that the
vibration plate 5 as a whole is uniformly oscillated by solving the problem of the above, so that
the excellent performance and the high input resistance can be realized simultaneously.
[0022]
Second Embodiment The invention according to the third aspect of the present invention will be
described below with reference to a second embodiment.
[0023]
In the present embodiment, the configuration of the voice coil used in the speaker according to
the first embodiment is partially different, and the other configuration is the same as that of the
first embodiment. The same reference numerals are given to the same reference numerals and
the detailed description thereof is omitted, and only different portions will be described below
with reference to the drawings.
[0024]
FIG. 3 is a plan view showing the configuration of a voice coil used for a loudspeaker according
to a second embodiment of the present invention. In FIG. 3, 9 is a voice coil, and this voice coil 9
is a polyimide substrate 9a. A coil 9b of a desired pattern is formed in a rectangular shape by
copper plating on the front surface (which is similarly formed on the back surface in the present
embodiment), and the coil 9b wound in the rectangular shape is It is formed in substantially the
same shape as the first magnetic gap 2a provided in the first magnetic circuit.
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[0025]
Reference numeral 9c denotes a dummy coil formed in a portion in which the coil is not formed
inside the coil 9b. The dummy coil 9c is not electrically connected to the coil 9b, and the center
in the longitudinal direction is a reference In the same manner as the coil 9b, a plurality of coils
are formed symmetrically by copper plating in the longitudinal direction.
[0026]
The speaker according to the present embodiment configured as described above has a
rectangular diaphragm 5 in addition to the same effect as the speaker according to the first
embodiment can be obtained by the configuration in which the dummy coil 9 c is provided in the
voice coil 9. By setting the dummy coil 9c in accordance with the elastic characteristics of the
above, it is possible to obtain the special effect that the elastic characteristics of the diaphragm 5
to which the voice coil 9 is coupled can be adjusted to an optimum one.
[0027]
FIG. 4 is a plan view of a voice coil showing another example of the voice coil used in the speaker
according to the present embodiment, and similar to the voice coil 9 shown in FIG. The coil 10b
is formed in a rectangular shape in a coiled state by copper plating on the surface of 10a and a
plurality of dummy coils 10c are formed. The dummy coils 10c are configured to have different
sizes. It is
[0028]
In addition, since the effect of the voice coil 10 comprised in this way is the same as that of the
voice coil 9 shown in the said FIG. 3, description here is abbreviate | omitted.
[0029]
Third Embodiment The invention according to the fourth aspect of the present invention will be
described below with reference to the third embodiment.
[0030]
5 (a) to 5 (c) are a plan view showing a configuration of a diaphragm used for a loudspeaker
according to a third embodiment of the present invention, and a sectional view taken along line
AA and a sectional view taken along line BB. In the figure, reference numeral 11 denotes a
rectangular diaphragm made of resin, and this diaphragm 11 has a flat plate-like main portion
11a at the central portion, an edge portion 11b at the periphery of the main portion 11a, and
this edge portion 11b. A flat plate-like attachment portion 11c is integrally formed at the
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periphery of the edge portion 11b, and a plurality of ribs 11d are provided at the central portion
in the longitudinal direction of the edge portion 11b.
[0031]
In the loudspeaker according to the present embodiment configured as described above, the
rigidity of the diaphragm 11 is increased by the configuration in which the plurality of ribs 11 d
are provided in the longitudinal direction of the edge portion 11 b of the diaphragm 11. The
inherent problem that the elasticity is smaller at the central part in the longitudinal direction of
the diaphragm 11 in shape than the both ends is eliminated, and the diaphragm 11 is uniformly
oscillated throughout, so that excellent performance and high input resistance can be achieved.
The special effect of being able to realize at the same time is obtained.
[0032]
The speaker according to the present invention is characterized in that the entire diaphragm can
be uniformly oscillated and excellent performance and high input resistance can be realized even
when the diaphragm having a rectangular shape or the like is used, and various types of audio
equipment , Electronic devices, or mobile phones, etc.
[0033]
The sectional view showing the composition of the speaker by Embodiment 1 of the present
invention The top view showing the composition of the voice coil used for the speaker The
composition of the voice coil used for the speaker by Embodiment 2 of the present invention is
shown Top view showing another example of the voice coil (a) Top view showing the
configuration of the diaphragm used for the speaker according to the third embodiment of the
present invention (b) In the same line AA (C) A cross-sectional view taken along the line B-B A
cross-sectional view showing the configuration of a conventional slim speaker A plan view
showing the configuration of a voice coil used in the same speaker
Explanation of sign
[0034]
DESCRIPTION OF SYMBOLS 1 1st yoke 2 1st magnet 2a 1st magnetic gap 3 1st flame | frame 4,
9, 10 voice coil 4a, 9a, 10a Base material 4b, 9b, 10b coil 4c, 9c, 10c dummy coil 5, 11
diaphragm 5a, 11a body portion 5b, 11b edge portion 6 second yoke 7 second magnet 7a
second magnetic gap 8 second frame 11c attachment portion 11d rib
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