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JP2008211486

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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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2008211486
An object of the present invention is to provide a highly reliable "speaker" in which there is no
fear that a diaphragm suitable for a high output low-pitched range may be separated from a
bobbin. A speaker in which a bobbin 3 on which a voice coil 4 is wound is elastically supported
by a damper 6 and an inner peripheral edge portion of a diaphragm 5 is bonded and fixed to the
bobbin 3 It shape | molded so that plate | board thickness might become large by the inner
peripheral side, and made the inner peripheral part the annular thickness part 5a with the largest
thickness of an axial direction. Then, the damper that adheres the inner peripheral surface 5b of
the annular thick portion 5a to the outer peripheral surface of the bobbin 3 and at least a part
(for example, the notch 5d) of the bottom surface 5c of the annular thick portion 5a. It is formed
in a shape along the inner peripheral edge portion (e.g., the annular convex portion 6 b) of 6 and
adhered to the damper 6. [Selected figure] Figure 2
スピーカ
[0001]
The present invention relates to a speaker in which a diaphragm bonded to a bobbin and driven
by a voice coil is made of a synthetic resin material, an aluminum die-cast, or the like, and more
particularly to a speaker suitable for high output bass range.
[0002]
The diaphragm of the speaker has a circular opening at the center, and a cylindrical bobbin
around which a voice coil is wound is disposed in this opening, and the inner peripheral edge of
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the diaphragm is adhered to the outer peripheral surface of the bobbin It is fixed.
Further, the outer peripheral edge portion of the diaphragm is supported by the frame integrated
with the magnetic circuit through the edge member. Conventionally, as a material of such a
diaphragm, cone paper etc. which are lightweight and easy to process are widely used (see, for
example, Patent Document 1).
[0003]
However, in high-power low-range speakers and the like, the diaphragm is required to have a
sufficient mechanical strength and a corresponding weight, so that a diaphragm made of cone
paper or the like is not necessarily preferable. Therefore, in the case of such a speaker, a
relatively heavy diaphragm made of a synthetic resin material may be used. The diaphragm made
of such a synthetic resin can be manufactured into a desired shape by injection molding of a
thermoplastic resin or the like. JP 2003-116197 A
[0004]
As described above, since the weight can be increased and the mechanical strength can be
increased by making the diaphragm of synthetic resin, it is possible to produce a diaphragm
suitable for a high output speaker for a low frequency range. As described above, when the heavy
diaphragm vibrates with a large amplitude, there is a problem that stress concentrates on the
bonding portion fixing the inner peripheral edge portion of the diaphragm to the outer
peripheral surface of the bobbin and the peeling accident easily occurs. That is, in general, only
the narrow annular portion adjacent to the bobbin of the inner peripheral edge portion of the
diaphragm is bonded and fixed to the bobbin, so the heavy diaphragm vibrates with a large
amplitude and is large in the bonded portion When shear stress is applied, the inner peripheral
edge portion of the diaphragm is easily peeled off from the bobbin and the reliability is
significantly impaired.
[0005]
The present invention has been made in view of the circumstances of the prior art as described
above, and its object is to provide a highly reliable speaker in which there is no fear that a
diaphragm suitable for a high output bass region is separated from a bobbin. It is.
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[0006]
According to the present invention, a diaphragm made of a synthetic resin material or aluminum
die-cast is formed such that the plate thickness of the diaphragm becomes larger on the inner
peripheral side, and the inner peripheral edge portion of the diaphragm is an annular thick
portion having the largest thickness in the axial direction. I did.
Then, the inner peripheral surface of the annular thick portion is adhered to the outer peripheral
surface of the bobbin, and at least a part of the bottom surface of the annular thick portion is
formed along the inner peripheral edge portion of the damper opposite to this It adhered to the
damper.
[0007]
According to the speaker of the present invention, the inner peripheral edge portion of the
diaphragm is an annular thick portion maximizing the thickness in the axial direction, and the
inner peripheral surface and the bottom surface of the annular thick portion are respectively
adhered to the bobbin and the damper Thus, the adhesive strength can be increased by
increasing the bonding area of the diaphragm to the bobbin, and the diaphragm is fixed to the
bobbin also via the damper. Therefore, it becomes difficult for the diaphragm having a weight
and weight distribution suitable for high-output low-pitched range to be peeled off from the
bobbin, and the reliability of the speaker is greatly enhanced.
[0008]
According to the present invention, the bobbin on which the voice coil is wound is elastically
supported by the damper, and the inner peripheral edge portion of the diaphragm is adhered and
fixed to the bobbin so that the diaphragm is driven when the voice coil is energized. In the
speaker, the thickness of the diaphragm on the inner peripheral side is larger than the thickness
on the outer peripheral side, and the inner peripheral edge portion is an annular thick portion
with the largest thickness in the axial direction. The inner peripheral surface of the thick portion
is bonded to the outer peripheral surface of the bobbin, and at least a part of the bottom surface
of the annular thick portion is formed along the inner peripheral edge of the opposed damper
and bonded to the damper It was configured.
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[0009]
The diaphragm of the speaker configured in this way can be set to a weight and weight
distribution suitable for high-output bass regions by forming the inner peripheral side thicker
than the outer peripheral side, and also suppresses rolling that might be a concern during
vibration it can.
Further, since the inner peripheral edge of the diaphragm is an annular thick portion, and the
inner peripheral surface of the annular thick portion is bonded to the outer peripheral surface of
the bobbin, the bonding area of the diaphragm to the bobbin is increased. Adhesive strength is
increased. In addition, since at least a part of the bottom surface of the annular thick portion is
formed along the inner peripheral edge of the damper and is adhered to the damper, the
adhesive strength of the diaphragm to the damper can be easily secured. Thus, the diaphragm
can be fixed to the bobbin.
[0010]
In the above configuration, a groove-shaped adhesive reservoir adjacent to the bobbin and an
annular convex portion continuous to the radially outer side of the adhesive reservoir are formed
on the inner peripheral edge portion of the damper, and the diaphragm annular When a portion
of the bottom surface of the thick portion that is adhered to face the annular convex portion is
curved along the annular convex portion, an adhesive reservoir is formed at the inner peripheral
edge to prevent dripping of the adhesive. The diaphragm can be reliably adhered to the existing
dampers.
[0011]
Further, in the above configuration, when the plate thickness of the diaphragm gradually
increases from the outer peripheral side to the inner peripheral side, the diaphragm can be easily
manufactured by injection molding of a synthetic resin material.
[0012]
An embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view
of a speaker according to a first embodiment of the present invention, and FIG. 2 is an enlarged
view of an essential part of FIG.
[0013]
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The speaker 1 shown in FIG. 1 is designed for a high output bass range.
The speaker 1 includes a magnetic circuit 2 having a magnetic gap G, a voice coil 4 wound
around a bobbin 3 and disposed in the magnetic gap G, and a trumpet shape, and an inner
peripheral edge portion is an outer peripheral surface of the bobbin 3 A diaphragm 5 made of
synthetic resin adhesively fixed to the disc, a disk-like damper 6 whose internal peripheral edge
is adhesively fixed to the outer peripheral surface of the bobbin 3 and the magnetic circuit 2 It is
mainly composed of a frame 7 supporting the outer peripheral edge of the diaphragm 5 and the
damper 6 and a dustproof cap 8 attached to the diaphragm 5 and closing the bobbin 3.
However, the outer peripheral edge portion of the diaphragm 5 is supported by the frame 7 via
the edge member 9 which is an easily deformable member such as urethane or rubber material,
and the inner peripheral edge portion of the diaphragm 5 and the voice coil 4 are wound. The
bobbin 3 is elastically supported by the damper 6.
The magnetic circuit 2 includes a lower yoke 10 having a center pole 10 a, a ring-shaped magnet
11 fixed on the lower yoke 10 so as to surround the center pole 10 a, and an annular plate fixed
on the magnet 11. The magnetic gap G is formed between the outer peripheral surface of the
center pole 10 a and the inner peripheral surface of the upper yoke 12.
[0014]
The diaphragm 5 is manufactured by injection molding of a thermoplastic resin. The thickness of
the diaphragm 5 gradually increases from the outer peripheral side to the inner peripheral side,
and the inner peripheral edge portion is an annular thick portion 5a having the largest thickness
in the axial direction. As shown in detail in FIG. 2, the inner circumferential surface 5 b of the
annular thick portion 5 a is adhesively fixed to the outer circumferential surface of the bobbin 3,
and a part of the bottom surface 5 c (notched portion 5 d) is the inner peripheral edge of the
damper 6. It is adhesively fixed to the part. An inner peripheral edge portion of the damper 6 is
formed with a grooved adhesive reservoir 6a adjacent to the bobbin 3 and an annular convex
portion 6b continuous to the outside in the radial direction of the adhesive reservoir 6a. The
bottom surface 5 c of the surface 5 a is bonded so that the notch 5 d faces the annular convex
portion 6 b of the damper 6. The notch 5d is formed over the entire periphery of the bottom
surface 5c of the annular thick portion 5a, and the shape of the notch 5d is concavely curved
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along the annular convex portion 6b as shown in FIG. Because of this, the bonding area of the
annular thick portion 5a to the damper 6 is wide, and sufficient bonding strength can be
obtained. The adhesive reservoir 6a of the damper 6 is for preventing dripping of the adhesive.
Moreover, the code | symbol 13 in FIG. 2 has shown the contact bonding layer.
[0015]
In the speaker 1 configured as described above, when the voice current is supplied to the voice
coil 4, the diaphragm 5 is driven integrally with the bobbin 3, so the air on the front surface of
the diaphragm 5 vibrates and the voice current The corresponding sound is emitted.
[0016]
As described above, the speaker 1 according to the first embodiment uses the diaphragm 5 made
of synthetic resin, and the thickness of the inner peripheral side of this diaphragm 5 is larger
than the thickness of the outer peripheral side, It can be set to a suitable weight for high output
low tone range.
Further, since the inner peripheral side of the diaphragm 5 close to the bobbin 3 which is the
drive source is made heavier, it is possible to suppress rolling which is a concern during
vibration. Moreover, since the diaphragm 5 is formed in a shape in which the plate thickness
gradually increases from the outer peripheral side toward the inner peripheral side, it is easy to
manufacture by injection molding from the inside through the gate.
[0017]
In the speaker 1 according to the first embodiment, the inner peripheral edge portion of the
diaphragm 5 is the annular thick portion 5a, and the inner peripheral surface 5b of the annular
thick portion 5a is bonded to the outer peripheral surface of the bobbin 3 Therefore, the bonding
area of the diaphragm 5 to the bobbin 3 is wide, and the bonding strength is increased.
Furthermore, since a part (notched portion 5d) of the bottom surface 5c of the annular thick
portion 5a is formed in a shape along the annular convex portion 6b of the inner peripheral edge
portion of the damper 6, and is bonded to the annular convex portion 6b The adhesive strength
of the diaphragm 5 to the damper 6 can be easily secured. That is, the diaphragm 5 is fixed not
only to the inner peripheral surface 5 b of the annular thick portion 5 a directly to the bobbin 3
but also to the bobbin 3 via the damper 6. Therefore, there is a possibility that the inner
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peripheral edge portion (annular thick portion 5a) of the diaphragm 5 may be separated from the
bobbin 3 even if the diaphragm 5 having a weight suitable for a high output bass region vibrates
with a large amplitude. The reliability of the speaker has been greatly enhanced.
[0018]
FIG. 3 is an enlarged view of an essential part of a speaker according to a second embodiment of
the present invention, and the parts corresponding to those in FIG.
[0019]
The speaker 20 shown in FIG. 3 is different from the first embodiment in the bottom surface
shape of the annular thick portion 5a corresponding to the inner peripheral edge portion of the
diaphragm 5 and the shape of the inner peripheral edge portion of the damper 6.
That is, in the speaker 20 according to the second embodiment, the bottom surface 5c of the
annular thick portion 5a of the diaphragm 5 is formed in a curved shape along the inner
peripheral edge portion of the damper 6 whose substantially entire surface faces the bottom
surface 5c. It is bonded to the damper 6. Therefore, in the second embodiment, the bonding
strength of the diaphragm 5 to the damper 6 is higher than that of the first embodiment.
[0020]
FIG. 4 is an enlarged view of an essential part of a speaker according to a third embodiment of
the present invention, and the parts corresponding to FIGS.
[0021]
In the speaker 30 shown in FIG. 4, an annular flat portion 6 c adjacent to the bobbin 3 and an
annular convex portion 6 b continuous to the radially outer side of the annular flat portion 6 c
are formed on the inner peripheral edge portion of the damper 6. The bottom surface 5c of the
annular thick portion 5a of the diaphragm 5 is formed in a shape along the annular flat portion
6c and the annular convex portion 6b.
That is, the bottom surface 5c of the annular thick portion 5a comprises an annular flat surface
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5e along the annular flat portion 6c and a concave portion 5d curved in a concave shape along
the annular convex portion 6b. It is bonded to the inner peripheral edge portion 6 (annular flat
portion 6c and annular convex portion 6b). Therefore, also in the third embodiment, as in the
second embodiment described above, the adhesive strength of the diaphragm 5 to the damper 6
is higher than in the first embodiment.
[0022]
FIG. 5 is a cross-sectional view of a loudspeaker according to a fourth embodiment of the present
invention, and FIG. 6 is an enlarged view of an essential part of FIG. 5. The portions
corresponding to FIGS. Duplicate descriptions are omitted.
[0023]
In the speaker 40 shown in FIGS. 5 and 6, since the second diaphragm 15 is attached to the front
surface of the diaphragm 5 whose inner peripheral edge portion is adhered to the bobbin 3 and
the damper 6, the diaphragm 40 has a two-sheet structure , The dustproof cap is omitted.
In the fourth embodiment, the diaphragm 5 of the speaker 40 has an outer diameter smaller than
that of the first to third embodiments described above and does not reach the edge member 9.
The shape of the peripheral portion (the annular thick portion 5a) and the shape of the inner
peripheral portion (the adhesive reservoir 6a and the annular convex portion 6b) of the damper
6 are the same as those of the first embodiment. In addition, the outer peripheral edge portion of
the second diaphragm 15 is supported by the frame 7 via the edge member 9.
[0024]
In each of the above-described embodiments, although the case where the diaphragm 5 is
manufactured by injection molding of a thermoplastic resin has been described, the diaphragm 5
may be manufactured using materials other than synthetic resin such as hard rubber and
aluminum die-cast. Is also possible.
[0025]
FIG. 1 is a cross-sectional view of a speaker according to a first embodiment of the present
invention.
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It is a principal part enlarged view of FIG. It is a principal part enlarged view of the speaker
which concerns on 2nd Example of this invention. It is a principal part enlarged view of the
speaker which concerns on 3rd Example of this invention. It is sectional drawing of the speaker
based on 4th Example of this invention. It is a principal part enlarged view of FIG.
Explanation of sign
[0026]
1, 20, 30, 40 Speaker 2 Magnetic circuit 3 Bobbin 4 Voice coil 5 Diaphragm 5a Annular thick
portion 5b Inner circumferential surface 5c Bottom 5d Notch 5e Annular flat surface 6 Damper
6a Adhesive reservoir 6b Annular convex portion 6c Annular Flat part 7 Frame 15 Second
diaphragm
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