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JP2008245120

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2008245120
PROBLEM TO BE SOLVED: To improve mechanical strength of a diaphragm and to miniaturize an
outer diameter shape in a speaker device. A support portion 1 supports a speaker magnet portion
3 and also supports an outer peripheral edge of a diaphragm 5. The vibrating membrane 5
integrally and concentrically has a dome portion 9 and an annular edge portion 11 around the
dome portion 9. The end face of the voice coil 7 is supported near the boundary between the
dome portion 9 and the edge portion 11 to surround the magnet portion 3. The dome portion 9
of the vibrating membrane 5 has a configuration in which a large number of concave or convex
grooves 21 are radially arrayed inside the annular portion 19. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a speaker device, and more particularly to an improvement of a
speaker device suitable for use in a speaker incorporated in a small electronic device or an
earphone for a headphone.
[0002]
Conventionally, as shown in FIG. 4A, for example, in the speaker device, the speaker magnet
portion 3 is disposed in the cup-shaped support portion 1, and the diaphragm 5 is disposed to
cover the tip of the magnet portion 3 It is well known that the peripheral portion is fixed to the
tip of the support portion 1 and the voice coil 7 is fixed to the vibrating film 5 so as to surround
the magnet portion 3 with a slight distance.
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1
[0003]
Moreover, from the viewpoint of improving the mechanical strength of the vibrating membrane 5
itself, the vibrating membrane 5 integrally projects the spherical dome 9 inside the annular edge
portion 11 as shown in FIG. 4B. As shown in FIG. 1, a large number of concave or convex grooves
13 are formed in a spiral in the edge portion 11 to support the end face of the voice coil 7 at the
boundary between the dome portion 9 and the edge portion 11.
[0004]
The vibrating membrane 5 shown in FIG. 4B is illustrated in the state viewed from the back side
(the same applies to the following).
[0005]
For example, Unexamined-Japanese-Patent No. 2002-281594 (patent document 1) is a general
well-known example of such a structure.
JP 2002-281594 A
[0006]
However, in the above-described conventional speaker device, the strength of the vibrating film 5
is insufficient, and as shown in FIG. 5A, there is a problem that the frequency characteristic is
easily disturbed due to the divided vibration from the middle sound range to the high sound
range.
In addition, FIG. 5A exaggerates and illustrates the influence by a division | segmentation
vibration (it is the same as FIG. 5B).
[0007]
However, if it is possible to suppress the divided vibration to some extent by making the convex
or concave dimension of the dome portion 9 larger than that of the edge portion 11 in the
vibrating film 5, the convex or concave dimension of the dome portion 9 If the size is increased,
the vibrating film 5 may protrude too much, or the distance between the vibrating film 5 and the
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magnet unit 3 needs to be increased, and the external shape may be enlarged.
[0008]
Therefore, if it is difficult to effectively suppress the occurrence of the above-mentioned divided
vibration, or if the input audio signal becomes large, irregular waveforms S occur before and
after the signal due to the rolling effect etc. as shown in FIG. 5B. There was also a problem that
sound was easy to distort and sound quality was easy to deteriorate.
[0009]
The present invention has been made to solve such problems, and it is an object of the present
invention to provide a speaker device that is easy to miniaturize and has excellent sounding
characteristics.
[0010]
In order to solve such problems, a speaker device according to the present invention comprises a
support portion, a speaker magnet portion supported by the support portion, and a cylindrical
voice coil disposed so as to surround the magnet portion. The end of the voice coil is supported
in the vicinity of an annulus which integrally and concentrically has an annular edge portion
integrally formed with a dome portion and the periphery thereof, and the outside of the edge
portion The diaphragm has a vibrating membrane whose periphery is supported by the
supporting portion, and a plurality of concave or convex grooves crossing the concentric circle
virtually formed inside the annular portion are annularly formed in the dome portion is there.
[0011]
In the speaker device of the present invention, a configuration in which the groove portions of
the dome portion are formed radially is also possible.
[0012]
In the speaker device according to the present invention, it is also possible that the dome portion
is formed such that the concave groove portion and the convex groove portion are adjacent to
each other.
[0013]
In such a speaker device according to the present invention, the speaker magnet portion is
supported by the support portion, the outer peripheral edge of the diaphragm is supported by
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the support portion, and an annular edge portion is integrated with the diaphragm portion
around the dome portion. And concentrically, the end face of the voice coil is supported in the
vicinity of the boundary between the dome portion and the edge portion to surround the magnet
portion, and the concentric portion virtually formed inside the annular portion on the dome
portion of the diaphragm Since a large number of concave or convex grooves crossing each other
are annularly arranged, the mechanical strength of the vibrating membrane can be improved, the
miniaturization can be facilitated, and the sound emission characteristics can be improved.
[0014]
In the speaker device of the present invention, in the configuration in which the groove portions
are radially formed, particularly, the vibrating film is likely to have a uniform mechanical
strength as a whole, so that good sound pressure characteristics can be maintained.
[0015]
In the speaker device according to the present invention, in the configuration in which the
concave and convex groove portions are formed adjacent to each other, the mechanical strength
of the diaphragm is particularly good, which contributes to downsizing.
[0016]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
The same reference numerals are given to parts common to the conventional example.
[0017]
FIG. 1 is a cross-sectional view showing an embodiment of a speaker device according to the
present invention by taking an earphone 1 as an example.
[0018]
In FIG. 1, the flat support portion 1 is formed into a cup shape by molding from a synthetic resin
or metal plate, and is formed so that the wide concave portion 15 and the sidewall of the side
wall forming the concave portion 15 are further widened. It is done.
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[0019]
A conventionally known speaker magnet unit 3 is fixed to a central portion of the recess 15 of
the support unit 1.
[0020]
The peripheral edge portion of the vibrating film 5 is fixed to the rising open end portion 17 of
the support portion 1 so as to cover the tip end of the magnet portion 3 and the recess 15.
[0021]
The vibrating film 5 is formed of, for example, a polyester resin film or the like, and has an inner
spherical dome portion 9 and a strip-like edge portion 11 integrally and annularly formed on the
outer periphery and formed in a substantially disc shape For example, the dome portion 9 is
provided to project from the edge portion 11.
A configuration in which the dome portion 9 is recessed from the edge portion 11 is also
possible.
[0022]
Although the edge portion 11 is also somewhat spherical, the curved surface of the dome portion
9 is larger than that of the edge portion 11.
[0023]
As shown in FIG. 2, in the edge portion 11 around the dome portion 9, many concave or convex
groove portions 13 are formed in a spiral shape in the edge portion 11.
[0024]
The end face of the voice coil 7 is fixed to an annular portion 19 formed at the boundary
between the dome portion 9 and the edge portion 11 on the back side of the vibrating membrane
5 so that the voice coil 7 surrounds the magnet portion 3 at a slight distance. Hanging down.
[0025]
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5
In the dome portion 9 of the vibrating membrane 5, when concentric circles are virtually formed
inside the annular portion 19, a large number of concave or convex grooves 21 crossing the
concentric circles are radially arranged.
[0026]
In FIG. 2, concave and convex grooves 21 are formed adjacent to each other, and a kind of petals
in which elongated elliptical grooves are continuously arranged in and out are formed radially.
[0027]
In the speaker apparatus having such a configuration, when an audio signal is applied to the
voice coil 7, a repulsive force and an attractive force are generated between the magnet unit 3
and the voice coil 7, and the diaphragm 5 fixed to the voice coil 7 vibrates. It is the same as that
of the conventional structure to sound it out.
[0028]
However, since a large number of groove portions 21 are radially arranged in the dome portion 9
of the vibrating membrane 5, the rigidity of the dome portion 9 is enhanced and the mechanical
strength is improved.
[0029]
In such a speaker device of the present invention, the speaker magnet portion 3 is supported by
the support portion 1 and the outer peripheral edge of the diaphragm 5 is supported by the
support portion 1 by the open front end portion 17. An annular edge portion 11 is integrally and
concentrically provided around this, and the end face of the voice coil 7 is supported in the
vicinity of the boundary between the dome portion 9 and the edge portion 11 to surround the
magnet portion 3 and its diaphragm The dome portion 9 has a configuration in which a large
number of concave or convex grooves 21 are radially arrayed inside the annular portion 19.
[0030]
Therefore, the mechanical strength of the vibrating membrane 5, particularly the dome portion 9
is improved, and it is possible to sufficiently suppress the divided vibration without increasing
the dimension of the projecting portion of the dome portion 9 in the vibrating membrane 5 It is
possible to eliminate the need for a large protrusion, or to narrow the distance between the
vibrating film 5 and the magnet portion 3, and it is easy to suppress the enlargement of the outer
shape, and the sounding characteristics also become good.
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[0031]
That is, in the speaker device of the present invention, the mechanical strength of the vibrating
film 5 is improved, the miniaturization, the input resistance and the transient characteristics are
improved, and, for example, in the case of maintaining the same performance with respect to the
conventional speaker device. It is possible to make the shape significantly thinner, and to
maintain the same dimensional shape, it is possible to improve the sound quality.
[0032]
The speaker device of the present invention is characterized by the groove 21 formed in the
dome 9 of the diaphragm 5, and the shape thereof is not limited to that shown in FIG. 2. For
example, as shown in FIG. Configuration is also possible.
[0033]
The point is that the object of the present invention can be achieved by arranging a large number
of concave or convex grooves 21 across the concentric circles virtually formed inside the annular
portion 19 in the dome portion 9 in an annular and radial manner.
[0034]
The speaker device of the present invention can be widely implemented in various speakers and
earphones.
[0035]
It is a sectional view showing an embodiment of a speaker device concerning the present
invention.
It is a perspective view which shows the diaphragm in the speaker apparatus of this invention.
It is a perspective view which shows the other diaphragm in the speaker apparatus of this
invention.
It is sectional drawing which shows the conventional speaker apparatus.
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It is a characteristic view of the conventional speaker apparatus.
Explanation of sign
[0036]
DESCRIPTION OF SYMBOLS 1 support part 3 magnet part 5 diaphragm 7 voice coil 9 dome part
11 edge part 13, 21 groove part 15 recessed part 17 open tip part 19 annular part
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