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JPH0998496

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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 JPH0998496
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
edgeless speaker suitable as a low frequency speaker, which has an annular edge attached
between the inner peripheral surface of the opening of the speaker frame and the outer
peripheral surface of the diaphragm. .
[0002]
2. Description of the Related Art In recent years, a low-aperture speaker as a low-pitched speaker
in recent years has an inner peripheral surface of the opening of a speaker frame and an outer
peripheral surface of a diaphragm so that sufficient sound pressure can be obtained and sound
distortion is reduced. An edgeless speaker is known which is configured to remove an annular
edge attached between the two.
[0003]
That is, a minute gap (annular space) having a width of about 1 mm is formed between the inner
peripheral surface of the opening of the speaker frame and the ring outer peripheral surface
around the diaphragm, and the diaphragm is not only vibrated smoothly, but also vibrates. It
blocks the flow of air before and after the board and functions as a bass speaker.
[0004]
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FIG. 6 shows one configuration example of such an edgeless speaker, and the magnetic circuit 1
is configured by the cancel magnet 2, the pole yoke 3, the magnet 4 and the plate 5.
In the magnetic gap between the pole piece 3 a and the plate 5, a voice coil 8 attached to the
bobbin 7 is interposed.
[0005]
The upper and lower ends of the bobbin 7 are supported by an upper damper 10 and a lower
damper 11 whose one end is attached to the frame 9.
Further, on the upper stage of the bobbin 7, the central hole 14 of the diaphragm 13 to which
the center cap 12 is attached at the central portion is fixed. The ring 16 attached to the outer
peripheral end 15 of the diaphragm 13 is separated by about 1 mm from the inner peripheral
surface 9a so as not to contact the inner peripheral surface 9a of the frame 9 when the
diaphragm 13 vibrates. Thus, an annular space is formed between the ring 16 and the opening
inner circumferential surface 9 a of the frame 9.
[0006]
An integrally formed fixed piece 18 is provided on the outer peripheral portion of the frame 9,
and is fixed to the baffle plate 30 of the cabinet by a screw or the like.
[0007]
And, at the time of driving, when the diaphragm 13 vibrates with the up and down movement of
the bobbin 7 supported by the upper damper 10 and the lower damper 11, the ring 16 of the
outer peripheral end 15 of the diaphragm 13 Since the vibration amplitude of the diaphragm 13
is increased by moving along the opening inner peripheral surface 9a without contact, sufficient
sound pressure can be obtained even with a small aperture speaker, and the sound distortion is
low. Bass reproduction is possible.
[0008]
By the way, in the above-mentioned edgeless speaker, the ring 16 at the outer peripheral end of
the diaphragm 13 is used as the opening inner periphery of the frame 9 in order to make the
diaphragm 13 vibrate smoothly. Although it is necessary to move along the surface 9a without
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contact, an annular space of a predetermined size is formed between the ring 16 and the opening
inner circumferential surface 9a of the frame 9, but the annular space is precisely In order to
maintain it, not only strictness is required for the mounting accuracy of each part, but also
pressure change occurs inside the cabinet with vibration of the diaphragm 13, air is circulated
through the annular space, unnecessary wind noise And the like occur, which causes a problem
that sound quality deterioration (performance deterioration) is caused.
[0009]
Therefore, in order to eliminate these problems, for example, as shown in FIG. 7, a ring-shaped
sealing material 17 is attached around the entire circumference of the end of the ring 16 to make
sliding contact with the opening inner circumferential surface 9a of the frame 9. As a result, the
space between the ring 16 and the opening inner peripheral surface 9a of the frame 9 is not only
kept constant, but the flow of air in front of and behind the diaphragm 13 is impeded by the
sealing material 17, so the above-mentioned problems are eliminated. It is thought that
[0010]
However, since the frame 9 is easily molded, the respective members constituting the frame 9 are
often integrally formed of resin, and the fixing piece 18 for fixing the baffle plate 30 of the
cabinet to the outer peripheral portion of the frame 9 is often used. When provided by integral
molding, when the resin material solidifies, tensile force (surface tension) acts in the extension
direction of each member, and a dent (dent) 19 is formed at the intersection of the frame 9 and
the fixing piece 18 It will occur.
[0011]
Since this dent 19 is generated in the direction orthogonal to the sliding direction of the seal
material 17 on the sliding surface which is the opening inner peripheral surface 9 a of the frame
9, along with the vibration of the diaphragm 13. When the sealing material 17 slides on the
sliding surface, the sliding contact surface of the sealing material 17 is caught in the dent 19 and
the sliding operation of the sealing material 17 is not performed smoothly, and the sound quality
is degraded. Cause the problem of causing
[0012]
Further, when the frame 9 is fixed to the cabinet, the weight of the relatively heavy magnetic
circuit 1 constituted by the cancel magnet 2, the pole yoke 3, the magnet 4 and the plate 5 is
added to the frame 9 with respect to the frame 9. Therefore, there is a possibility that the frame
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9 may be bent or the like.
In this case, the sliding contact state between the sealing material 17 and the opening inner
peripheral surface 9a of the frame 9 is not properly maintained, and the sliding operation of the
sealing material 17 is not smoothly performed, resulting in the deterioration of the sound quality.
Cause a problem of
[0013]
The present invention has been made to cope with such a situation, and it is an object of the
present invention to provide an edgeless speaker capable of improving the sound quality by
smoothly performing the sliding operation of the sliding portion.
[0014]
The invention according to claim 1 is integrally provided with a diaphragm, sealing between the
outer peripheral side of the diaphragm and the inner peripheral surface of the opening of the
speaker frame, and the inner periphery of the opening An edgeless speaker including a sliding
portion slidable with respect to a surface and fixed to a cabinet via a fixing piece formed by
integral molding on an outer periphery of a frame body of the speaker frame. The fixing pieces
provided on the outer periphery of the frame body are disposed outside the sliding range of the
opening inner peripheral surface of the sliding portion.
[0015]
The invention according to claim 2 is provided integrally with the diaphragm, seals between the
outer peripheral side surface of the diaphragm and the inner peripheral surface of the opening of
the speaker frame, and is slidable relative to the inner peripheral surface of the opening The
edgeless speaker has a sliding portion and a rib is integrally formed on the outer periphery of the
frame body of the speaker frame, and the arrangement direction of the rib integrally formed with
the frame body is the same as that of the sliding portion. It is characterized in that it is in the
same direction as the sliding direction on the opening inner circumferential surface.
[0016]
In the edgeless speaker according to the present invention, since the fixed piece on the outer
periphery of the frame body of the speaker frame is disposed outside the sliding range of the
inner peripheral surface of the opening of the sliding portion, the frame and fixed piece during
molding Since it is possible to remove dents generated at the intersections of the parts with the
sliding range of the sliding part, when the sliding part slides, it is caught in the dent and the
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smooth sliding operation can not be performed. Therefore, the sliding movement of the sliding
portion can be smoothly performed.
[0017]
Also, with the speaker frame fixed to the cabinet, even if the weight of the relatively heavy
magnetic circuit in which the frame body is integrally provided with the speaker frame is added
to the frame body, the rigidity of the frame body is provided by the ribs. Since it is enhanced, no
bending or the like occurs in the frame body, and the sliding contact state between the opening
inner peripheral surface of the frame body and the sliding portion can be maintained favorably,
so the sliding operation of the sliding portion is smooth Can do it.
[0018]
In this case, since the arrangement direction of the rib integrally formed with the frame body of
the speaker frame is the same as the sliding direction on the opening inner circumferential
surface of the sliding portion, this occurs at the intersection of the frame body and the fixing
piece The direction of the sinking (sinking) is the sliding direction on the opening inner
circumferential surface of the sliding portion, and when the sliding portion slides, smooth sliding
operation can be performed without being caught by the sinking (denting).
[0019]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the embodiments of
the present invention will be described below with reference to the drawings.
In the drawings described below, the same parts as those in FIGS. 4 to 6 are denoted by the same
reference numerals, and the redundant description will be omitted.
[0020]
[First Embodiment] FIG. 1 shows an embodiment of an edgeless speaker according to the present
invention, and an elastic body such as rubber or foamed rubber or a fibrous porous member is
provided at the end of the ring 16 A seal member 20 is attached as a deformable sliding portion.
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The sealing material 20 is disposed to seal the entire space (annular space) between the
diaphragm 13 or the ring 16 and the opening inner peripheral surface 9 a of the frame 9.
As a result, even if a pressure change occurs inside the cabinet due to the vibration of the
diaphragm 13, the annular space is sealed, so the flow of air through the annular space is limited.
That is, in the state in which the entire space (annular space) between the inner circumferential
surface 9a and the opening inner circumferential surface is sealed, unnecessary wind noise etc.
generated by pressure change in the cabinet with vibration of the diaphragm 13 To the extent
that the flow of air is restricted to such an extent that
[0021]
In the frame 9, the outer peripheral body 9e is the outer periphery of the frame body 9b via the
connecting portion 9d extending in the direction orthogonal to the frame body 9b from the open
end 9c of the frame body 9b having the opening inner peripheral surface 9a. A fixing piece 9f is
provided in the direction orthogonal to the outer peripheral body 9e at the end of the outer
peripheral body 9e to be attached to the baffle plate 30 of the cabinet 31 described later by a
screw 32 or the like.
[0022]
As a result, the above-described dents 19 generated during resin molding are fixed to the
intersection A of the frame body 9b and the joint 9d, the intersection B of the joint 9d and the
outer circumference 9e, and the outer circumference 9e. The crossing portion A of the frame
body 9b and the connecting portion 9d, which are generated at the crossing portion C with the
piece 9f, respectively, when the seal member 20 slides, is on the side of the opening end 9c of
the frame body 9b. Because the seal 20 is out of the sliding range of the seal member 20, an
adverse effect due to the dent 19 is avoided.
[0023]
FIG. 2 shows how the edgeless speaker is attached to the cabinet. A fixing piece 9 f is fixed to the
baffle plate 30 of the cabinet 31 by a screw 32.
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The sub baffle 33 is attached to the front side of the cabinet 31.
[0024]
In this case, when the outer peripheral end 15 of the diaphragm 13 is disposed at a position
recessed from the opening end 9g of the frame body 9b, a space partitioned by the opening inner
peripheral surface 9a is generated inside the frame body 9b. When the sound wave generated by
the vibration of the diaphragm 13 leaves the open end 9g of the frame body 9b, the diffraction
phenomenon causes spreading, which causes a reduction in sound pressure and the like,
resulting in a problem such as a reduction in sound quality. The outer peripheral end 15 of the
diaphragm 13 is preferably disposed near the open end 9g of the frame body 9b.
More preferably, the outer peripheral end 15 of the diaphragm 13 is flush with the open end 9g
of the frame body 9b.
[0025]
When the method of reducing the diffraction phenomenon by the sub baffle 33 is used, it is more
preferable to lower the position of the fixed piece 9 f on the outer periphery of the frame body 9
b of the frame 9 than the outer peripheral end 15 of the diaphragm 13.
This is because when the position of the fixed piece 9 f is raised above the outer peripheral end
15 of the diaphragm 13, a space is generated between the sub baffle 33 and the frame 9, which
causes the above-mentioned problems due to the diffraction phenomenon. is there.
[0026]
Therefore, in this embodiment, the fixed piece 9f on the outer periphery of the frame body 9b of
the frame 9 is out of the sliding range on the opening inner peripheral surface 9a of the sealing
material 20, so the frame body 9b and the fixed piece during molding Since the dent generated at
the intersection with 9f can be removed from the sliding range of the seal member 20, when the
seal member 20 slides, it is caught in the dent and smooth sliding operation can be performed.
There is no problem such as disappearance, and the sliding operation of the sealing material 20
can be performed smoothly.
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[0027]
Second Embodiment FIGS. 3 to 5 show a second embodiment in which the rigidity of the frame
body 9b is enhanced by forming a rib between the frame body 9b and the outer peripheral body
9e. It is shown.
[0028]
As shown in these drawings, a plurality of narrow ribs 40 are provided by integral molding
between the frame body 9b and the outer peripheral body 9e.
Thereby, since the space between the frame body 9 b and the outer peripheral body 9 e is
integrated by the ribs 40, the rigidity of the frame body 9 b is enhanced.
[0029]
In this case, the dents 19 described above occur at the intersections of the respective ribs 40 and
the frame body 9 b, but the dents 19 formed at these intersections are within the opening of the
frame 9. Since the direction is the same as the sliding direction of the sealing material 20 with
respect to the sliding surface which is the circumferential surface 9a, as described above, when
the sealing material 17 slides on the sliding surface, the sliding contact surface of the sealing
material 17 There is no risk of being caught in a dent, and sliding of the sealing material 20 is
performed smoothly.
[0030]
Further, since the dents generated by the respective ribs 40 are formed by the narrow ribs 40,
the dent portions are extremely small, and when the seal material 20 slides, the sliding surface
Since a slight amount of air can be circulated without causing deterioration in sound quality, it is
possible to avoid an adsorption phenomenon that occurs when the sliding contact portion
between the sealing material 20 and the sliding surface is in a vacuum state. The slidability of the
sealing material 20 can also be kept good.
[0031]
Therefore, in the state where the frame 9 is fixed to the cabinet 31, even if the weight of the
relatively heavy magnetic circuit provided integrally with the frame 9 is added to the frame body
9b, the rigidity of the frame body 9b is increased by the ribs 40. Therefore, the frame body 9b is
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not bent or the like, and the sliding contact state between the opening inner peripheral surface
9a of the frame body 9b and the sealing material 20 can be maintained favorably. Operation can
be done smoothly.
[0032]
As described above, according to the edgeless speaker of the present invention, the fixed piece on
the outer periphery of the frame body of the speaker frame is disposed outside the sliding range
of the inner peripheral surface of the opening of the sliding portion. Therefore, since it is possible
to remove the dent (dent) generated at the intersection of the frame body and the fixing piece at
the time of molding from the sliding range of the sliding portion, when the sliding portion slides,
There is no problem that the smooth sliding operation can not be performed due to being caught,
and the sliding operation of the sliding portion can be smoothly performed.
[0033]
Also, with the speaker frame fixed to the cabinet, even if the weight of the relatively heavy
magnetic circuit in which the frame body is integrally provided with the speaker frame is added
to the frame body, the rigidity of the frame body is provided by the ribs. Since it is enhanced, no
bending or the like occurs in the frame body, and the sliding contact state between the opening
inner peripheral surface of the frame body and the sliding portion can be maintained favorably,
so the sliding operation of the sliding portion is smooth Can do it.
[0034]
In this case, since the arrangement direction of the rib integrally formed with the frame body of
the speaker frame is the same as the sliding direction on the opening inner circumferential
surface of the sliding portion, this occurs at the intersection of the frame body and the fixing
piece The direction of the sinking (sinking) is the sliding direction on the opening inner
circumferential surface of the sliding portion, and when the sliding portion slides, smooth sliding
operation can be performed without being caught by the sinking (denting).
Therefore, since the sliding operation of the sliding portion can be smoothly performed, the
sound quality can be improved.
[0035]
Brief description of the drawings
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[0036]
1 is a half cut sectional view showing an embodiment of the edgeless speaker of the present
invention.
[0037]
2 is a cross-sectional view showing the edgeless speaker attached to the cabinet of FIG.
[0038]
3 is a plan view showing the frame of FIG.
[0039]
4 is a low elevation view showing the frame of FIG.
[0040]
5 is a cross-sectional view showing the frame of FIG.
[0041]
6 is a half-cut sectional view showing a conventional edgeless speaker.
[0042]
7 is a half-cut cross-sectional view for explaining the case where a sealing material is provided to
the edgeless speaker of FIG.
[0043]
Explanation of sign
[0044]
9 frame 9a opening inner peripheral surface 9b frame body 9c opening end 9d connecting part
9e outer peripheral body 13 diaphragm 16 ring 20 seal material 30 baffle plate 31 cabinet 32
screw
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