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JP2009200828

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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 JP2009200828
An object of the present invention is to provide a structure in which the outer diameter of a
center cap does not depend on the bobbin diameter, is excellent in high input resistance, and can
efficiently transmit the driving force of a voice coil to a diaphragm and center cap, and has a high
frequency range. To provide a speaker whose characteristics can be improved. A diaphragm (10)
has a cone portion (13) and an L-shaped bending portion (16) comprising a neck portion (14)
extending in the longitudinal direction of the bobbin (6) and an extending portion (15) extending
in the central direction of the bobbin (6). . The center cap 11 has a dome portion and a bent
portion 17 bent outward from the end of the dome portion, and the bent portion 17 is in contact
with the front surface of the extension portion 15 of the diaphragm 10 and is joined by an
adhesive 18. ing. Thus, the center cap 11 having the outer edge portion whose diameter is
smaller than the outer diameter of the bobbin 6 can be joined to the diaphragm 10. [Selected
figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker used for various audio devices, information
communication devices, and the like.
[0002]
Speakers are widely used not only for home or car audio equipment but also for various
electronic devices such as personal computers, mobile phones, game machines, flat-screen
televisions, etc. There is a need for thinner, better sound quality speakers.
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[0003]
FIG. 17 shows a conventional general speaker 100, in which (A) is a side cross sectional view of
the speaker 100, and (B) is an enlarged view of an A part of the joint portion between the
diaphragm and the center cap and bobbin which is the same main part. It is.
[0004]
In the speaker 100, as shown in FIG. 17A, the magnet 102 is sandwiched between the pole piece
103 and the pot yoke 104 to constitute an internal magnetic type magnetic circuit 105.
A bobbin 106 is disposed so as to surround a part of the magnetic circuit 105, and a voice coil
107 wound around the bobbin 106 is disposed in the magnetic gap of the magnetic circuit 105.
The inner periphery of the frame 108 is joined to the outer periphery of the pot yoke 104 of the
magnetic circuit 105.
The outer peripheral portion of the diaphragm 110 is joined to the outer peripheral portion of
the frame 108 via an edge 109, and a center cap 111 is disposed on the front side of the
diaphragm 110 and the bobbin 106. Then, the bobbin 106 is joined to the vibration plate 110,
and the bobbin 106 is held at the center by the damper 112. As shown in FIG. 17B, the inner
peripheral end of the diaphragm 110 is joined to the bobbin 106, the center cap 111 covers the
opening of the bobbin 106, and the outer peripheral end is on the front surface of the diaphragm
110. It is joined.
[0005]
In the speaker 100 configured as described above, the outer edge of the center cap 111 has to be
larger than the outer diameter of the bobbin 106, so the larger the outer diameter of the bobbin
106, the larger the outer edge of the center cap 111. There is a problem that the mass increases,
the high frequency limit frequency decreases, and the output sound pressure in the high
frequency range decreases. In addition, if the outer edge of the center cap 111 and the inner
diameter of the diaphragm 110 are reduced to improve the frequency characteristics of the high
frequency range, the outer diameter of the bobbin 106 also decreases accordingly, and the voice
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coil 107 The outer diameter of the When comparing with a voice coil with the same impedance
and the same winding width, if the outer diameter of the voice coil 107 is small, the wire
diameter of the voice coil wire becomes small even if the input is the same. As a result, the
amount of heat generated increases, the possibility of thermal destruction of the voice coil wire
and the bobbin 106 increases, and there is a problem that high input can not be tolerated.
[0006]
Also, a speaker having a center cap structure different from the speaker 100 is known. FIG. 18
shows the speaker 200, in which (A) is a side sectional view of the speaker 200, and (B) is an
enlarged view of a portion B of the joint portion of the diaphragm, the center cap and the bobbin
which is the same main part.
[0007]
As shown in FIG. 18, in the speaker 200, the diaphragm 210 and the center cap 211 are
integrally formed, and the bobbin 206 is joined in the vicinity of the joint portion. The other
structure is the same as that of the speaker 100.
[0008]
In the speaker 200 configured as described above, unlike the speaker 100, the outer shape of the
center cap 211 can be made smaller than the inner diameter of the bobbin 206. However, as
shown in FIG. There is a problem that a compliance of a predetermined size is generated at the
turn-back portion due to the presence of an R-shaped turn-back portion at the connection portion
of the head and the center cap 211, and the drive force of the voice coil can not be sufficiently
transmitted to the diaphragm. is there.
[0009]
Moreover, the speaker which aimed at the sound quality improvement of the middle-high range
by proposing the junction structure of a center cap, a diaphragm, and a bobbin is proposed (for
example, refer patent document 1).
[0010]
FIG. 19 shows a speaker 300 according to Patent Document 1, (A) is a side sectional view of the
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speaker 300, (B) is an enlarged view of a portion C of the joint portion of the diaphragm, the
center cap and the bobbin which is the same main part. is there.
[0011]
As shown in FIG. 19B, in the speaker 300, the diaphragm 308, the bobbin 306, and the
cylindrical lower end 309a of the center cap 309 are adhesively bonded by the adhesive 310 so
as to cover the upper end of the bobbin 306, and the center cap The lower end 309a of the
cylinder 309 is bent outward at an angle, and the tip thereof is in contact with the diaphragm
308, and the diaphragm 308, the center cap 309 and the bobbin 306 are bonded and fixed by
the adhesive 310.
Since the center cap 309 and the diaphragm 308 are not coupled by the adhesive 310, the phase
shift between the diaphragm 308 and the center cap 309 is suppressed, and the occurrence of
peak dip in the high frequency band and the middle to high frequency band Patent Document 1
describes that sound quality deterioration can be suppressed.
JP 2005-269064 A
[0012]
However, Patent Document 1 has the following problems.
[0013]
That is, in the speaker 300 according to Patent Document 1, the outer edge portion of the center
cap 309 must be larger than the outer diameter of the bobbin 306 as in the above-described
speaker 100. Therefore, the larger the diameter of the voice coil 306 Since the mass increases
with the increase of the outer edge portion of the high frequency band, there is a problem that
the high frequency limit frequency is lowered and the output sound pressure in the high
frequency band is lowered.
Further, in the speaker 300, for the same reason as the speaker 100, there is a possibility that
high input can not be tolerated if it is attempted to improve the high frequency range frequency
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characteristic.
[0014]
The present invention has been made in view of such problems, and an object thereof is to make
the outer edge portion of the center cap independent of the bobbin diameter and to be excellent
in the resistance to high input and of the voice coil. An object of the present invention is to
provide a speaker capable of efficiently transmitting a driving force to a diaphragm and a center
cap, and capable of improving the frequency characteristic of a high range.
[0015]
According to one aspect of the present invention, a magnetic circuit including a magnet, a plate
joined to a front surface of the magnet, and a yoke joined to a bottom surface of the magnet, and
at least a part of the magnetic circuit And a voice coil wound around the bobbin, disposed in the
magnetic gap of the magnetic circuit and capable of oscillating back and forth, a frame joined to
the magnetic circuit, and a rear inner side In a speaker including a front end portion of a bobbin
joined and an outer peripheral edge portion supported by the frame via an edge, the speaker is
disposed on the front side of the bobbin and has an outer diameter equal to or more than the
outer diameter of the bobbin A center cap having a diameter smaller than that of the bobbin, and
at least a portion of the diaphragm is provided inside the outside diameter of the bobbin, and
inside the outside diameter of the bobbin Speaker and having a bent portion which is joined to
the outer edge of the center cap is provided at.
[0016]
According to the present invention, the outer diameter of the center cap is not influenced by the
bobbin diameter, the resistance to high input is excellent, and the driving force of the voice coil
can be efficiently transmitted to the diaphragm and the center cap. It is possible to provide a
speaker capable of improving the frequency characteristic of the sound range.
[0017]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0018]
First Embodiment FIG. 1 shows a speaker 1 according to a first embodiment of the present
invention, in which (A) is a side sectional view of the speaker 1 and (B) is a diaphragm and a
center which are the same as each other. It is the D section enlarged view of the junction part of
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a cap and a bobbin.
[0019]
The speaker 1 shown in FIG. 1 includes a cylindrical magnet 2, a disk-shaped plate (pole piece) 3
joined to the front of the magnet 2, and a pot-shaped yoke (pot yoke) joined to the bottom of the
magnet 2. 4, and an inner magnetic type magnetic circuit 5 having a coil 4, a bobbin 6 disposed
so as to surround at least a part of the magnetic circuit 5, and a bobbin 6 wound around and
disposed in a magnetic gap of the magnetic circuit 5 The voice coil 7 which can be oscillated
back and forth, the frame 8 joined to the outer peripheral portion of the yoke 4 of the magnetic
circuit 5, and the outer peripheral edge portion is supported by the frame 8 via the edge 9. Is
joined to the bobbin 6 and the outer periphery is the front face of the frame 8 Be supported by
the department The bumpers 12, and includes a.
[0020]
Here, based on FIG. 1 (B), the joined state of the diaphragm 10, the bobbin 6 and the center cap
11, which is a characteristic part in the present embodiment, will be described.
[0021]
The diaphragm 10 has a cone portion 13 and an L-shaped bending portion 16 including a neck
portion 14 extending in the longitudinal direction of the bobbin 6 and an extending portion 15
extending in the central direction of the bobbin 6.
The inner periphery of the front end of the bobbin 6 is disposed so as to surround the outer
periphery of the neck portion 14 of the diaphragm 10 and is joined by the adhesive 18, and the
center cap 11 is outward from the dome portion and the end portion of the dome portion The
bent portion 17 is in contact with the front surface of the extension portion 15 of the diaphragm
10 and is joined by an adhesive 18.
As described above, in the speaker 1, the center cap 11 having the outer edge portion whose
diameter is smaller than the outer diameter of the bobbin 6 can be joined to the diaphragm 10.
[0022]
In the center of the extension portion 15, a circular opening for removing air is provided.
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[0023]
Next, the frequency characteristics of the speaker will be described.
FIG. 2 is a diagram showing measurement results of output sound pressure-frequency
characteristics of the speaker 1 according to the present embodiment and the conventional
speaker 100 in comparison, and the solid line E represents the speaker 1 and the dotted line F
represents the conventional speaker 100. It is a frequency characteristic.
As shown in FIG. 2, it can be seen that the high frequency band limit frequency is significantly
improved in the speaker 1 according to the present embodiment as compared with the
conventional speaker 100.
This makes it possible to reduce the mass of the center cap 11 because the center cap 11 having
the outer edge smaller in diameter than the inner diameter of the bobbin 6 and the neck portion
14 of the diaphragm 10 can be used. Even if the size of the cap 11 is reduced, it is not necessary
to reduce the wire diameter of the voice coil wire, and the high input resistance is improved, and
the center cap 11 can be joined to the extension 15 of the diaphragm 10, This is due to the
improvement of the sound transmission efficiency.
[0024]
As described above, the speaker 1 according to the first embodiment can use the center cap 11
having the outer edge portion whose diameter is smaller than the inner diameter of the bobbin 6
and the neck portion 14 of the diaphragm 10. By directly bonding to the extension portion 15,
the frequency characteristic of the high frequency range is improved, and a speaker having a
high upper limit frequency can be provided.
[0025]
In addition, since the speaker 1 does not need to reduce the diameter of the voice coil as in the
speaker 100 in order to improve the frequency characteristic of the high sound range, it can
withstand high input.
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[0026]
Further, by providing the extending portion 15 extending from the neck portion 14 of the
diaphragm 10 to the center side of the bobbin 6, the strength of the neck portion 14 is improved,
and the center cap 11 is attached to the extending portion 15 near the neck portion 14. Fixing
with the adhesive 18 makes it possible to make the compliance of the neck portion 14 smaller
than that of the conventional structure, and thus has the effect of promoting the improvement of
the frequency characteristic of the high frequency range.
[0027]
In the present embodiment, the center cap 11 has the dome portion and the bent portion 17 bent
outward from the end portion of the dome portion, but the shape of the bent portion of the
center cap is not limited to this aspect, Various modifications are possible without departing from
the spirit of the present invention.
For example, as shown in FIG. 3, a center cap 11a having a dome and a bent portion 17a bent
inward from the end of the dome, or as shown in FIG. 4, a neck from the end of the dome and
dome Center cap 11 b having a bent portion 17 b bent along portion 14 or as shown in FIG. 5,
there is no bent portion, and the end of the dome portion abuts on the boundary portion between
neck portion 14 and extension 15. The center cap 11c etc. which are in contact are applicable.
[0028]
Further, the shape of the bent portion of the diaphragm 10 is not limited to this embodiment,
and, for example, as in the diaphragm 10a shown in FIG. 6, the neck portion 14 and the L-shaped
extension portion 15a Bending portion 16a configured in a letter shape, or a bending portion
having a neck portion 14a inclined in the center direction and an extension portion 15b forming
a V shape with the neck portion 14a like the diaphragm 10b shown in FIG. 7 Various shapes can
be applied, such as a bending portion 16c having a neck portion 14 and a substantially squarewave-shaped extending portion 15c (a portion surrounded by a dotted line) as in the portion 16b
or the diaphragm 10c shown in FIG. It is.
These various shapes may be combined to form a bend.
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[0029]
Furthermore, the bonding position of the bobbin 6 is not limited to the outer peripheral portion
of the neck portion 14, and for example, as shown in FIG. 8, the center cap is bonded to a
recessed portion (recessed portion) of the extending portion 15c. As long as the outer end of is
smaller than the outer diameter of the bobbin, various shapes are applicable.
[0030]
Moreover, in this embodiment, although the shape of the opening part in the center part of the
extension part 15 was made circular shaped, it is not limited to this and various shapes are
applicable.
[0031]
Second Embodiment A second embodiment is different from the first embodiment in the shape
on the inner side of the bending portion of the diaphragm.
[0032]
FIG. 9 is a cross-sectional view of a loudspeaker 1a according to a second embodiment of the
present invention.
In FIG. 9, the same components as in FIG. 1A are denoted by the same reference numerals, and in
the following, differences will be mainly described.
[0033]
As shown in FIG. 9, the diaphragm 10d of the speaker 1a includes the bending portion 16 having
the neck portion 14 and the extending portion 15d as in the speaker 1, but the air venting at the
center portion of the extending portion 15d There is no opening for the
The configuration other than the above is the same as that of the speaker 1 according to the first
embodiment.
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[0034]
The speaker 1a according to the present embodiment can use the center cap 11 having the outer
edge smaller in diameter than the inner diameter of the bobbin 6 and the neck portion 14 of the
diaphragm 10d as in the speaker 1 according to the first embodiment. By directly bonding 11 to
the extension part 15d of the diaphragm 10d, the frequency characteristic of high frequency
band and high input resistance can be improved, and a speaker with high high frequency band
limit frequency can be provided.
[0035]
Furthermore, in the speaker 1a, since the opening is not formed at the central portion of the
diaphragm 10d, the radial strength of the diaphragm 10d is higher than that of the speaker 1,
and the front end of the bobbin 6 and the diaphragm 10d The junction between the neck portion
14 and the center cap 11 is reinforced to improve the frequency characteristics of the high
frequency range, and the center cap 11 is not affected by the back pressure in the space inside
the speaker, making the center cap 11 rigid. It is possible to use a low material, and the
adjustment range of sound quality and frequency characteristics can be expanded.
[0036]
Third Embodiment A third embodiment differs from the first embodiment in the configuration of
the central portion of the diaphragm.
[0037]
FIG. 10 is a cross-sectional view of a loudspeaker 1b according to a third embodiment of the
present invention.
In FIG. 10, the same components as in FIG. 1A are denoted by the same reference numerals, and
in the following, differences will be mainly described.
[0038]
As shown in FIG. 10, the diaphragm 10 of the speaker 1 b is provided with a bending portion 16
having a neck portion 14 and an extending portion 15 in the same manner as the speaker 1. A
shaped opening is provided.
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Unlike the speaker 1, in the speaker 1 b, a disk-shaped sound absorbing material 19 is disposed
on the front side of the extending portion 15, and the opening is closed by the sound absorbing
material 19.
The outer peripheral portion of the sound absorbing material 19 abuts on the front surface
portion of the extending portion 15 and is fixed.
The sound absorbing material 19 may be made of a light material such as glass wool or felt
having good sound absorbing characteristics.
The configuration other than the above is the same as that of the speaker 1 according to the first
embodiment.
[0039]
The speaker 1b according to the present embodiment enables the use of the center cap 11
having the outer edge portion whose diameter is smaller than the inner diameter of the bobbin 6
and the neck portion 14 of the diaphragm 10 similarly to the speaker 1 according to the first
embodiment. By bonding the center cap 11 directly to the extension 15 of the diaphragm 10, the
frequency characteristics of high frequency band and high input resistance can be improved, and
a speaker with high high frequency band can be provided.
[0040]
Further, since the sound absorbing material 19 is disposed so as to close the air venting opening
provided at the central portion of the extending portion 15, the speaker 1b has a space portion
inside the speaker similar to the speaker 1a. While not being influenced by the back pressure, the
sound quality can make the sound quality have a change, and the mass of the vibrating portion
can be made lighter than the speaker 1a.
[0041]
In the present embodiment, the sound absorbing material 19 has a disk shape, but the sound
absorbing material has no particular limitation as long as it has a shape that closes the opening,
and the prism shape or the like may be used according to the shape of the opening. A
hemispherical shape etc. can be designed suitably.
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[0042]
Further, in the present embodiment, the sound absorbing material 19 is disposed on the front
side of the extending portion 15. However, the present invention is not limited to this as long as
the opening is closed. An arrangement in which bonding is performed on the rear surface side by
bonding or an arrangement in which a sound absorbing material is fitted in the opening is
applicable.
[0043]
Fourth Embodiment A fourth embodiment is different from the first embodiment in the joint
structure of the voice coil and the diaphragm.
[0044]
FIG. 11 shows a speaker 1c according to a fourth embodiment of the present invention, in which
(A) is a side sectional view of the speaker 1c, and (B) is a joint portion between the diaphragm,
the center cap and the bobbin which is the same main part. D part enlarged view, (C) is a half
section view of the coupler which is a member for reinforcement.
In FIG. 11, the same components as in FIG. 1 are denoted by the same reference numerals, and in
the following, differences will be mainly described.
[0045]
As shown in FIG. 11B, the configuration of the diaphragm 10, the bobbin 6 and the center cap 11
is the same as that of the speaker 1 according to the first embodiment, and the bobbin 6 and the
neck portion 14 of the diaphragm 10 The center cap 11 having an outer edge smaller than the
inner diameter can be used, and by bonding the center cap 11 to the extension 15 of the
diaphragm 10, the high frequency range frequency characteristics and high input resistance are
improved. Can provide a speaker with a high high frequency band limit frequency.
[0046]
A feature of the speaker 1 c according to the present embodiment is that the speaker 1 c is
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12
provided with a coupler 20 for connecting the diaphragm 10 and the bobbin 6.
As shown in FIG. 11C, the coupler 20 includes a front end 21a that abuts on the cone 13 of the
diaphragm and a rear end 21b that abuts on the bobbin 6. The cone 13 and the front end 21a
And the rear end 21b are respectively joined by an adhesive 18a.
Since the diaphragm 10 and the bobbin 6 are structurally and firmly joined via the coupler 20,
the diaphragm 10 and the bobbin 6 are easily separated even if the diaphragm 10 and the
bobbin 6 are subjected to severe vibration. Also, by increasing the mass but strengthening the
strength in the vicinity of the junction between the diaphragm 10 and the bobbin 6, the
frequency characteristic of the high range is further improved, and a speaker with a higher upper
limit frequency is provided. it can.
[0047]
In addition, by using the coupler 20, a practical speaker can be configured even in the structure
in which the strength is lower than that of the present embodiment in the bonding of only the
diaphragm and the bobbin.
For example, as shown in FIG. 12, the structure in which the front end of the bobbin 6 abuts on
the rear end of the neck portion 14 of the diaphragm 10, or as shown in FIG. The structure in
which the front end of the bobbin 6 abuts on the rear surface of the bending portion 16d
(bending portion = extension), or the front end of the bobbin 6 on the rear surface of the cone
portion 13 of the diaphragm 10e as shown in FIG. It is possible to apply a structure in which the
portions abut, or a structure in which a bent portion at the front end of the bobbin 6 abuts on the
rear surface of the bent portion 16d of the diaphragm 10e.
In any case, the outer edge of the center cap 11 is smaller than the outer diameter of the bobbin
6 or 6a.
[0048]
(Other Embodiments) Although the representative embodiments of the present invention have
been described above, the present invention is not limited to only the structure of the abovedescribed embodiments, and various modifications can be made without departing from the spirit
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of the present invention. Changes are possible.
[0049]
For example, in each embodiment mentioned above, although the center cap was dome shape,
there is no restriction in shape, and it may be square shape.
Also, the diaphragm is not limited to a cone shape, and may be a dome shape or a flat shape.
[0050]
Moreover, although it was an internal magnet type speaker in all the above-mentioned each
embodiment, it is applicable also to an external magnet type speaker.
[0051]
The speaker 1 by the 1st Embodiment of this invention is shown, (A) is a sectional side view of
the speaker 1, (B) is D part of the junction part of the diaphragm 10 which is the same principal
part, the center cap 11, and the bobbin 6. Enlarged view.
The figure which compared and showed the measurement result of the output sound pressurefrequency characteristic of the speaker 1 by this embodiment, and the conventional speaker 100.
FIG.
The figure which shows the center cap 11a which has a bending part 17a bent inside from the
terminal part of a dome part and a dome part.
The figure which shows the center cap 11b which has the bending part 17b bent along the neck
part 14 from the terminal part of a dome part and a dome part.
The figure which shows the center cap 11c which does not have a bending part and the terminal
part of the dome part is contact | abutting to the boundary part of the neck part 14 and the
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extension part 15. FIG.
The figure which shows the bending part 16a comprised by the U-shape by the neck part 14 and
the L-shaped extension part 15a.
The figure which shows the bending part 16b which has the extension part 15b which forms V
shape with the neck part 14a and neck part 14a which inclined in the center direction. The figure
which shows the bending part 16c which has the neck part 14 and the extension part 15c of
substantially square wave shape. Sectional drawing of the speaker 1a by the 2nd Embodiment of
this invention. Sectional drawing of the speaker 1b by the 3rd Embodiment of this invention. The
speaker 1c by the 4th Embodiment of this invention is shown, (A) is a sectional side view of the
speaker 1c, (B) is the diaphragm 10 which is the principal part, and the junction part of the
center cap 11 and the bobbin 6. D part enlarged view, (C) is a half section view of coupler 20
which is a member for reinforcement. FIG. 7 is a view showing a structure in which a front end of
the bobbin 6 abuts on a rear end of the neck portion 14 of the diaphragm 10; The figure which
shows the structure where the front end part of the bobbin 6 contact | abuts to the rear surface
part of the bending part 16d of the diaphragm 10e without a neck part. The figure which shows
the modification of FIG. The figure which shows the structure where the front end part of the
bobbin 6 contact | abuts to the rear surface part of the cone part 13 of the diaphragm 10e. The
figure which shows the structure where the bending part which has the front end of the bobbin 6
contact | abuts in the rear surface part of the bending part 16d of the diaphragm 10e. The
conventional general speaker 100 is shown, (A) is a side sectional view of the speaker 100, (B) is
an enlarged view of an A portion of the joint portion of the diaphragm 110, the center cap 111,
and the bobbin 106 which is the same main part. . The speaker 200 of the center cap structure
different from the speaker 100 is shown, (A) is a side sectional view of the speaker 200, (B) is a B
portion of the joint portion of the diaphragm 210, the center cap 211, and the bobbin 206 which
is the same main part. Enlarged view. The speaker 300 by patent document 1 is shown, (A) is a
sectional side view of the speaker 300, (B) is the C section enlarged view of the junction part of
the diaphragm 308 which is the principal part, the center cap 309, and the bobbin 306. FIG.
Explanation of sign
[0052]
DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c Speaker 2 magnet 3 plate (pole piece) 4 yoke (pot yoke)
5 magnetic circuit 6 bobbin 7 voice coil 8 frame 9 edge 10, 10a, 10b, 10c, 10d, 10e diaphragm
11, 11a , 11b, 11c Center cap 12 Damper 13 Cone part 14, 14a Neck part 15, 15a, 15b, 15c,
15d Extension part 16, 16a, 16b, 16c, 16d Bending part 17 Bending part 18, 18a Adhesive 19
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Sound absorbing material 20 coupler 21a front end 21b rear end
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