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JP2005026920

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DESCRIPTION JP2005026920
The present invention relates to a loudspeaker apparatus in which unnecessary vibration is
eliminated by increasing the strength of a portion connecting a dome diaphragm and an edge
diaphragm in a speaker diaphragm, and a speaker device having a good quality of acoustic signal
up to a high frequency range. provide. A speaker diaphragm (1A) includes a dome diaphragm (2),
an edge diaphragm (3), and a connection flat portion (5) connecting these. A thick part 4A
thicker than the other parts is integrally formed on the connection flat part 5 and the outer
peripheral part of the dome part diaphragm 2 and the inner peripheral part of the edge part
diaphragm 3, and the speaker diaphragm 1A is connected Increase the mechanical strength of
the flat portion 5 and its vicinity. Further, the end face of the bobbin 6 is adhered and fixed to the
thick portion 4A to further increase the mechanical strength. [Selected figure] Figure 1
Speaker diaphragm and speaker device
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker diaphragm and a speaker device used for various audio devices, video devices and the
like. Specifically, the thick portion is formed in the vicinity of the portion where the dome portion
diaphragm and the edge portion diaphragm are connected, so that the sound signal can be
reproduced well up to the high frequency range. 2. Description of the Related Art FIG. 11 is a
side sectional view showing an example of the configuration of a general speaker device using a
conventional dome-shaped diaphragm. The speaker device 100 is a so-called electrodynamic
speaker, and includes a speaker diaphragm 101 and driving means of the speaker diaphragm
101. The speaker diaphragm 101 includes a dome diaphragm 102 having a convexly curved
shape, and an edge diaphragm 103 having a curved cross section or a straight cross section, or a
cross sectional shape combining both, and the dome vibration. The plate 102 and the edge
vibration plate 103 are integrally formed via the connection flat portion 104. In the driving
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means of the speaker diaphragm 101, a plate 106 is provided on a magnet 105, and a voice coil
109 is disposed so as to have a gap 108 with respect to a pole piece 107. Then, the bobbin 110
around which the voice coil 109 is wound is fixed to the speaker diaphragm 101. In the above
configuration, when a signal is input to the signal input line 111, a current flows through the
voice coil 109, so that the voice coil 109 present in the magnetic field by the magnet 105
generates a driving force by the electromagnetic action. As a result, the speaker diaphragm 101
to which the bobbin 110 on which the voice coil 109 is wound is fixed vibrates, and an acoustic
signal is output. FIG. 12 is a side sectional view showing an example of the main configuration of
a conventional speaker device. The bobbin 110 is cylindrical and has a voice coil 109 wound
around it. Further, the front end of the bobbin 110 is adhered to the inner surface edge portion
102 a formed on the outer periphery of the dome portion diaphragm 102 by an adhesive 112.
Further, as a speaker device, there is also a device called an electrodynamic type electromagnetic
induction speaker or the like in which a primary coil for excitation is provided on the pole piece
side and a conductive ring is attached to a bobbin. FIG. 13 is a side sectional view showing an
example of the main configuration of an electrodynamic type electromagnetic induction speaker
which is an example of another conventional speaker device. In the configuration of FIG. 13A, the
conductive ring 113 is mounted around the cylindrical bobbin 110. Further, the front end of the
bobbin 110 is adhered to the inner surface edge portion 102 a formed on the outer periphery of
the dome portion diaphragm 102 by an adhesive 112.
In the configuration of FIG. 13 (b), the front end of the cylindrical conductive ring 113 is adhered
to the inner surface edge 102 a of the dome diaphragm 102 by an adhesive 112. The speaker
diaphragm 101 is integrally formed by, for example, pressing a sheet-like member made of a
metal material such as aluminum or titanium or a sheet-like member made of a polymer material
such as polyethylene terephthalate. . Therefore, the connection flat portion 104 connecting the
dome portion diaphragm 102 and the edge portion diaphragm 103, the bent portion of the
connection portion between the connection flat portion 104 and the dome portion diaphragm
102, and the connection flat portion 104 and the edge portion vibration. The bent portion of the
joint portion of the plate 103 has a reduced thickness because it is pulled during molding. The
bobbin 110 or the conductive ring 113 for giving a driving force to the speaker diaphragm 101
is attached to the connection flat portion 104 with weak mechanical strength in the speaker
diaphragm 101. Therefore, when the speaker diaphragm 101 is driven at a certain frequency,
vibrations with a 180 degree phase shift are generated between the dome diaphragm 102 and
the edge diaphragm 103 with the connection flat portion 104 as a node. As a result, at a certain
frequency, the acoustic signal generated from the dome diaphragm 102 and the acoustic signal
generated from the edge diaphragm 103 cancel each other, resulting in a dip in sound pressure.
In particular, there is a disadvantage that the quality of the acoustic signal is degraded when the
dip is in the audible range. Furthermore, at a high frequency of 20 kHz or more, the driving force
from the bobbin 110 or the conductive ring 113 is absorbed by the weak connection flat portion
104 of the mechanical strength and is not transmitted to the edge diaphragm 103. It will As a
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result, there is a problem that the required sound pressure can not be obtained at a high
frequency of 20 kHz or more. Therefore, a technique for improving the strength of the
connection flat portion by using an adhesive for bonding the bobbin and the conductive ring to
the speaker diaphragm has been disclosed (see, for example, Patent Document 1). FIG. 14 is a
side sectional view showing an example of the main configuration of the speaker device disclosed
in this conventional document. In the configuration of FIG. 14A, the adhesive 112 is applied in
accordance with the width of the connection flat portion 104, and the bobbin 110 is abutted
against and fixed to the connection flat portion 104, whereby the mechanical strength of the
connection flat portion 104 is increased. It is increasing. Further, in the configuration of FIG.
14B, the adhesive 112 is applied in accordance with the width of the connection flat portion 104,
and the conductive ring 113 is abutted against the connection flat portion 104 and fixed.
Here, by making the plate thickness of the conductive ring 113 equal to the width of the
connection flat portion 104, the mechanical strength is further increased. Furthermore, a
configuration is also conceivable in which the mechanical strength of the connection flat portion
is increased by adhesively fixing a reinforcing ring to the connection flat portion. However, in the
method of reinforcing the speaker diaphragm with the adhesive, the variation of the strength
depending on the application condition of the adhesive. There is a problem that occurs. In
addition, when the adhesive is applied in accordance with the width of the connection flat
portion, the vibration system becomes heavy and there is a problem that the quality of the
acoustic signal is degraded. Furthermore, in order to match the plate thickness of the conductive
ring to the width of the connection flat portion, the width of the magnetic gap also needs to be
increased. This causes a new problem that the sound pressure sensitivity is reduced. In addition,
bonding and fixing the reinforcing ring to the connection flat portion requires that the
reinforcing ring be separately formed, and a process for bonding and fixing the both be
necessary, which increases the cost. There's a problem. The present invention has been made to
solve such a problem, and it is an object of the present invention to provide an inexpensive
speaker diaphragm and a speaker device capable of reproducing an acoustic signal up to a high
frequency range. SUMMARY OF THE INVENTION In order to solve the above-mentioned
problems, a loudspeaker diaphragm according to the present invention is a loudspeaker
diaphragm in which a dome diaphragm and an edge diaphragm are integrally formed. A thick
portion thicker than the dome portion diaphragm and the edge portion diaphragm is integrally
formed at a portion connecting the portion diaphragm and the edge portion diaphragm, and the
inner peripheral portion of the thick portion is the dome portion The diaphragm is continuously
formed up to the outer periphery of the diaphragm, and the outer periphery of the thick portion
is continuously formed up to the inner periphery of the edge diaphragm. According to the
speaker diaphragm of the present invention, the dome diaphragm and the edge diaphragm are
formed by forming the thick portion in the vicinity of the portion where the dome diaphragm and
the edge diaphragm are connected and in the vicinity thereof. It is possible to improve the
strength of the site connecting the A speaker apparatus according to the present invention is one
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to which the above-described speaker diaphragm is applied. That is, in a speaker apparatus
including a speaker diaphragm in which a dome diaphragm and an edge diaphragm are integrally
formed, and a driving unit for driving the speaker diaphragm, the speaker diaphragm includes
the dome diaphragm and the edge. A thick portion thicker than the dome portion diaphragm and
the edge portion diaphragm is integrally formed at a portion connected to the diaphragm, and
the thick portion is provided with a joint portion to which the drive means is joined. The inner
peripheral portion of the thick portion is continuously formed to the outer peripheral portion of
the dome portion diaphragm, and the outer peripheral portion of the thick portion is
continuously formed to the inner peripheral portion of the edge portion diaphragm.
According to the speaker device of the present invention, the driving force from the driving
means is transmitted to the thick portion of the speaker diaphragm, and the acoustic signal is
generated by the vibration of the speaker diaphragm by the driving force from the driving
means. It is emitted. In the speaker diaphragm, the thick portion is formed in the vicinity of the
portion connecting the dome portion diaphragm and the edge portion diaphragm, and the
strength of the portion connecting the dome portion diaphragm and the edge portion diaphragm
Is improved. As a result, it is possible to prevent generation of vibrations 180 degrees out of
phase between the dome diaphragm and the edge diaphragm, with the part connecting the dome
diaphragm and the edge diaphragm as a node. Further, by connecting the drive means to the
thick portion, the driving force from the drive means is transmitted to the edge portion
diaphragm without being absorbed by the portion connecting the dome portion diaphragm and
the edge portion diaphragm. Thus, it is possible to reproduce high-pitched sound, for example,
high-pitched sound up to 100 kHz. BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of a speaker diaphragm and a speaker device according to the present invention
will be described below with reference to the drawings. FIG. 1 is a cutaway perspective view
showing an example of the configuration of the speaker diaphragm of the present embodiment,
and FIG. 2 is a side cross-sectional view showing an example of the main configuration of the
speaker diaphragm of the present embodiment. In addition, in FIG. 1, in order to prevent the
complication of a drawing, the hatching which shows that it is a cross section is not given. The
speaker diaphragm 1A according to the present embodiment has a thick portion 4A at a site
where the dome diaphragm 2 and the edge diaphragm 3 are connected, and enables
reproduction of high-frequency band up to 100 kHz, for example. It is a thing. The speaker
diaphragm 1A is formed, for example, by pressing a sheet-like member made of a metal material
such as aluminum or titanium or a sheet-like member made of a polymer material such as
polyethylene terephthalate. The dome portion diaphragm 2 is a diaphragm having a convexly
curved shape. The edge diaphragm 3 is a ring-shaped diaphragm having a curved cross-section
or a straight cross-section, or a cross-section in which both are combined, and is provided outside
the dome diaphragm 2. The dome diaphragm 2 and the edge diaphragm 3 are integrated through
the connection flat 5 and the connection flat 5 and its vicinity, ie, the outer periphery of the
dome diaphragm 2 connected to the connection flat 5 to the edge A thick portion 4A is formed
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up to the inner peripheral portion of the diaphragm 3. The thick portion 4A has a thickness
greater than that of the portion where the thick portion 4A of the dome portion diaphragm 2 and
the edge portion diaphragm 3 is not provided.
For example, the thickness of the thick portion 4A is approximately twice the thickness of the
dome portion diaphragm 2 and the edge portion diaphragm 3 other than the thick portion 4A.
Here, in the example shown in FIGS. 1 and 2, the thick portion 4A is formed in a shape in which
the thick portion protrudes on the back surface side of the speaker diaphragm 1A. Then, a ringshaped flat portion 5 a is formed on the thick portion 4 </ b> A corresponding to the back
surface of the connection flat portion 5. The thick portion 4 A has an inner peripheral portion 5 b
continuous to the outer peripheral portion of the dome portion diaphragm 2 and an outer
peripheral portion 5 c continuous to the inner peripheral portion of the edge diaphragm 3. Then,
the edge portion of the inner peripheral portion 5b is tapered, and the thick portion 4A and the
dome portion diaphragm 2 are connected by a slope. Similarly, the edge portion of the outer
peripheral portion 5c is tapered, and the thick portion 4A and the edge portion diaphragm 3 are
connected by a slope. This prevents stress concentration at the boundary between the thick
portion 4A and the diaphragm in which the thick portion 4A is not formed. The thick portion 4A
is formed in the dome portion diaphragm 2 about 1 mm from the end P1 of the outer peripheral
portion of the dome portion diaphragm 2, and the thick portion 4A is formed in the edge portion
diaphragm 3 And a range of about 1 mm from P2 of the inner peripheral portion of the edge
portion diaphragm 3. With the above configuration, the speaker diaphragm 1A is connected not
only to the connection flat portion 5 but also to a bent portion where the connection flat portion
5 and the dome portion diaphragm 2 are connected, and the connection flat portion 5 and the
edge portion diaphragm 3 The thick portion 4A is formed including the bent portion. The flat
portion 5a of the thick portion 4A is an example of a joint portion, and the front end portion of
the bobbin 6 constituting the driving means is bonded by an adhesive 6a. The bobbin 6 is
cylindrical and has a uniform diameter. Next, the configuration of a speaker apparatus provided
with the above-described speaker diaphragm 1A will be described. FIG. 3 is a side sectional view
showing a configuration example of the speaker device according to the present embodiment.
The speaker device 7A of the present embodiment has a speaker diaphragm 1A and driving
means for the speaker diaphragm 1A. Here, FIG. 3 is described taking the electrodynamic type
electromagnetic induction speaker as an example. In the speaker diaphragm 1 A, the outer
peripheral portion of the edge diaphragm 3 is fixed to the frame 8 by adhesion or the like.
Further, the driving means includes, for example, a pole piece 9, an excitation primary coil 10, a
magnet 11, a plate 12, and a conductive ring 13. The conductive ring 13 has, for example, a
band-like conductive material in a single ring shape, and is mounted on the bobbin 6 bonded to
the speaker diaphragm 1A.
The exciting primary coil 10 is wound around the pole piece 9, and the conductive ring 13 is
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disposed with a gap 14 with respect to the exciting primary coil 10. Also, a plate 12 is provided
on the magnet 11, and the plate 12 faces the conductive ring 13. Thus, the conductive ring 13 is
held in the gap 14 of the magnetic circuit by the magnet 11. FIG. 4 is an equivalent circuit of the
induction unit of the electrodynamic type electromagnetic induction speaker. In this equivalent
circuit, the resistor R1 and the coil L1 on the primary side of the input impedance Zin correspond
to the exciting primary coil 10 shown in FIG. Further, the resistor R2 and the coil L2 on the
secondary side correspond to the conductive ring 13 shown in FIG. In the above configuration,
when voltage V1 corresponding to the input signal is applied to resistor R1 on the primary side
of input impedance Zin and coil L1, and current I1 flows, mutual inductance is applied to resistor
R2 on the secondary side and coil L2 A current I2 corresponding to the output signal flows due
to the induction by M. Therefore, in FIG. 1, when a signal is input to the signal input line 15
connected to the primary excitation coil 10, the current flowing through the primary excitation
coil 10 changes, and the magnet 11 and the excitation 1 are changed. When the magnetic field
generated by the next coil 10 changes, an induced current flows through the conductive ring 13,
and the conductive ring 13 vibrates up and down by the electromagnetic force. The conductive
ring 13 is attached to the bobbin 6, and the bobbin 6 is fixed to the speaker diaphragm 1A by
adhesion. Therefore, a signal current is supplied to the primary excitation coil 10 to induce a
signal in the conductive ring 13. Then, the speaker diaphragm 1A vibrates and an acoustic signal
is output. The bobbin 6 on which the conductive ring 13 is mounted is preferably made of a very
thin sheet in order to lighten the vibration system including the speaker diaphragm 1A.
Therefore, the thickness of the end face of the bobbin 6 joined to the speaker diaphragm 1A is
thin. In the speaker diaphragm 1A of the present embodiment, as shown in FIGS. 1 and 2, the
connection flat portion 5 connecting the dome portion diaphragm 2 and the edge portion
diaphragm 3 and the vicinity thereof, ie, the connection The plate thickness of the diaphragm
including the bent portion where the flat portion 5 and the dome portion diaphragm 2 are
connected and the bent portion where the connection flat portion 5 and the edge portion
diaphragm 3 are connected is formed thicker than the thickness of the other portions. The thick
portion 4A is formed. By fixing the bobbin 6 to the flat portion 5a formed in the thick portion 4A,
the mechanical strength of the connection flat portion 5 and the vicinity thereof is increased
without thickening the plate thickness of the bobbin 6.
FIG. 5 is a graph showing the result of calculating the sound pressure-frequency characteristics
of the speaker device 7A using the speaker diaphragm 1A of this embodiment by the finite
element method. FIG. 6 shows the sound pressure of the conventional speaker device It is a
graph which shows the result of having calculated the frequency characteristic by the finite
element method. First, the conditions in the conventional configuration will be described. The
width of the connection flat portion is 0.25 mm, and the thickness of the bobbin is as small as
0.05 mm with respect to the connection flat portion. In such a conventional configuration, as
shown in FIG. 6, a sharp drop in sound pressure is observed at about 50 kHz or more. In the
conventional configuration, since the strength of the connection flat portion is insufficient, the
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driving force by the bobbin can not be sufficiently transmitted to the edge portion diaphragm at
a high frequency of 50 kHz or more, and the conversion from the speaker diaphragm to the
acoustic output is efficient It turns out that it does not happen. On the other hand, in the present
embodiment, in the speaker diaphragm 1A, the thick portion 4A is formed in the connection flat
portion 5 and the vicinity thereof, and the plate thickness of the thick portion 4A is set to the
other portions. The calculation was performed as twice the thickness of the diaphragm. The
width of the connection flat portion 5 and the thickness of the bobbin 6 are the same as those
calculated in FIG. As shown in FIG. 5, in the present embodiment, a large drop in the sound
pressure is not seen near 50 kHz as compared with the conventional configuration, and the
driving force from the bobbin 6 is transmitted to the edge portion diaphragm 3 and acoustics
efficiently. It can be seen that conversion to output is taking place. Further, in the speaker
diaphragm 1A of the present embodiment, since the mechanical strength of the connection flat
portion 5 and the vicinity thereof is improved, the dome portion diaphragm 2 and the edge with
the connection flat portion 5 as a node are provided. It is possible to prevent the generation of
vibrations 180 degrees out of phase with the partial diaphragm 3. Therefore, at a specific
frequency, the acoustic signal generated from the dome diaphragm 2 and the acoustic signal
generated from the edge diaphragm 3 cancel each other out, thereby causing no dip in sound
pressure. Quality is improved. Next, a method of manufacturing the speaker diaphragm 1A of the
present embodiment will be described. FIG. 7 is an explanatory view showing a molding example
of the speaker diaphragm of the present embodiment. In the speaker diaphragm 1A, the plate
thickness of the connecting flat portion 5 connecting the dome portion diaphragm 2 and the
edge portion diaphragm 3 at the time of molding and the diaphragm in the vicinity thereof
becomes thicker than the plate thickness of other portions. It is molded. An example of the
manufacturing process will be described. First, for the sheet 16 having a thickness necessary to
form the thick portion 4A, as shown in FIG. 7A, the portion of the connection flat portion 5 is
formed. .
Next, as shown in FIG. 7B, the upper metal mold 20 fixes a portion to be the connection flat
portion 5 of the sheet 16, and a lower metal having a dome portion forming portion 21 a and an
edge portion forming portion 21 b. The mold 21 is moved in the direction of the arrow to press
the portion to be the dome portion diaphragm 2 and the edge portion diaphragm 3. Since the
sheet 16 other than the portion fixed to the upper mold 20 is stretched at the time of molding,
the thickness of the sheet 16 becomes thinner than that of the connection flat portion 5 molded
in advance and the vicinity thereof. Therefore, as shown in FIG. 1, the connection flat portion 5
connecting the dome portion diaphragm 2 and the edge portion diaphragm 3 and the outer
periphery of the dome portion diaphragm 2 connected to the connection flat portion 5 and the
edge portion diaphragm 3 The speaker diaphragm 1A in which the thick portion 4A is formed on
the inner periphery is obtained. The molding method of the speaker diaphragm 1A is an example,
and the similar speaker diaphragm 1A may be molded by a molding method such as using a split
die. FIG. 8 is a cutaway perspective view showing a modification of the speaker diaphragm. In
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addition, in FIG. 8, in order to prevent the complication of a drawing, the hatching which shows
that it is a cross section is not given. The speaker diaphragm 1B shown in FIG. 8 is provided with
a plurality of thick portions 4B in the connection flat portion 5 so that thick portions and thin
portions are alternately arranged along the circumferential direction. . The inner peripheral
portion 5 b of each thick portion 4 B continues to the outer peripheral portion of the dome
portion diaphragm 2, and the outer peripheral portion 5 c continues to the inner peripheral
portion of the edge diaphragm 3. In the above configuration, the diaphragm weight can be
reduced as compared with the case where a thick portion having a uniform thickness in the
circumferential direction is formed, and therefore, the sensitivity to the input voltage is improved.
Further, since the plurality of thick portions 4B can be formed at one time by pressing, the
number of man-hours is not increased. In order to obtain the same effect as the speaker
diaphragm shown in FIG. 8, at least one of the outer peripheral portion and the inner peripheral
portion of the thick portion having a uniform thickness in the circumferential direction is
provided in the circumferential direction. An uneven shape may be provided along the FIG. 9 is a
side sectional view of an essential part showing another modification of the speaker diaphragm.
The speaker diaphragm 1C shown in FIG. 9 has the thick portion 4A formed so as to project on
both the front and back sides of the speaker diaphragm 1C. The overall configuration of the
speaker diaphragm is the same as that described with reference to FIG. In addition, the thick
portion may be formed to protrude on the surface side of the speaker diaphragm. FIG. 10 is a
side sectional view showing another configuration example of the speaker device. The speaker
device 7B shown in FIG. 10 is an electrodynamic speaker, and a voice coil 17 is wound around a
bobbin 6 as a driving means.
For example, the speaker diaphragm 1A shown in FIG. 1 is used as a speaker diaphragm having a
thick portion, and the outer peripheral portion of the edge diaphragm 3 is fixed to the frame 8 by
adhesion or the like. In addition, as a driving means, a pole piece 9, a magnet 11 and a plate 12
are provided. A plate 12 is provided on the magnet 11, and the plate 12 faces the voice coil 17.
Thus, the voice coil 17 is held in the gap 14 of the magnetic circuit by the magnet 11. In the
above configuration, when a signal is input to the signal input line 18, a current flows through
the voice coil 17, so that the voice coil 17 present in the magnetic field by the magnet 11
generates a driving force by the electromagnetic action. As a result, the speaker diaphragm 1A to
which the bobbin 6 is adhered vibrates, and an acoustic signal is output. Even in the speaker
device 7B using the voice coil 17 as the driving means, the driving force from the bobbin 6 is an
edge by using the speaker diaphragm 1A in which the thick portion 4 is formed in the connection
flat portion 5 and the vicinity thereof. It is transmitted to the diaphragm 3 to enable reproduction
of the high range. In addition, the acoustic signal generated from the dome diaphragm 2 and the
acoustic signal generated from the edge diaphragm 3 cancel each other out, thereby causing no
dip in sound pressure, and the quality of the acoustic signal is improved. As described above,
according to the present invention, in the speaker diaphragm in which the dome diaphragm and
the edge diaphragm are integrally formed, the dome diaphragm and the edge diaphragm are
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connected. The thick portion with a thicker plate thickness than the dome portion diaphragm and
the edge portion diaphragm is integrally formed at the portion to be formed, and the inner
peripheral portion of the thick portion is continuously formed to the outer peripheral portion of
the dome portion diaphragm The outer peripheral portion of the thick portion is continuously
formed up to the inner peripheral portion of the edge portion diaphragm. Further, the present
invention is a speaker device to which the speaker diaphragm is applied, and a drive means for
driving the speaker diaphragm is joined to a joint portion provided in a thick portion of the
speaker diaphragm. Therefore, since the strength of the portion connecting the dome portion
diaphragm and the edge portion diaphragm is improved, the generation of unnecessary vibration
can be suppressed and the reduction of the sound pressure can be suppressed. In addition, the
driving force is efficiently transmitted, and the high range can be reproduced. BRIEF
DESCRIPTION OF THE DRAWINGS FIG. 1 is a cutaway perspective view showing a configuration
example of a speaker diaphragm of the present embodiment. FIG. 2 is a side cross-sectional view
showing an example of a main configuration of a speaker diaphragm of the present embodiment.
FIG. 3 is a side sectional view showing a configuration example of the speaker device according
to the present embodiment. FIG. 4 is an equivalent circuit of the induction portion of the
electromagnetic induction type speaker. FIG. 5 is a graph showing sound pressure-frequency
characteristics of the speaker device according to the present embodiment. FIG. 6 is a graph
showing sound pressure-frequency characteristics of the conventional speaker device. FIG. 7 is
an explanatory view showing a molding example of the speaker diaphragm of the present
embodiment. FIG. 8 is a cutaway perspective view showing a modification of the speaker
diaphragm. FIG. 9 is a side sectional view of an essential part showing another modification of
the speaker diaphragm. FIG. 10 is a side sectional view showing another configuration example
of the speaker device. FIG. 11 is a side sectional view showing a configuration example of a
conventional general speaker device. FIG. 12 is a side sectional view showing an example of a
main configuration of a conventional speaker device. FIG. 13 is a side sectional view showing an
example of the main configuration of another conventional speaker device. FIG. 14 is a side
sectional view showing an example of the main configuration of another conventional speaker
device. Explanation of the code 1A, 1B, 1C ... speaker diaphragm, 2 ... dome diaphragm, 3 ... edge
diaphragm, 4A, 4B ... thick part, 5 ... connection Flat portion 5a: Flat portion 5b: Inner
circumferential portion 5c: Outer circumferential portion 6: Bobbin 7A, 7B: Speaker device 8:
Frame 9: 9 Pole piece, 10: primary coil for excitation, 11: magnet, 12: plate, 13: conductive ring,
14: gap, 17: voice coil
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