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DESCRIPTION JP2006100879

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DESCRIPTION JP2006100879
PROBLEM TO BE SOLVED: To provide a ring type speaker capable of achieving both
improvement of acoustic characteristics such as frequency characteristics and directivity
characteristics including suppression of unnecessary vibration and abnormal noise, and ease of
assembly and reduction of the number of parts and man-hours. Do. SOLUTION: The ring-type
speaker according to the present invention comprises a magnetic circuit, a voice coil disposed in
a magnetic gap of the magnetic circuit, an annular ring diaphragm to which the voice coil is
connected, and an inner periphery of the ring diaphragm. Ring-shaped speaker comprising a
bullet-shaped equalizer, an annular equalizer disposed on the outer periphery of a ring
diaphragm, and a plurality of radially extending plate-like connecting arms connecting the bulletshaped equalizer and the annular equalizer The connecting arm is represented by a first ridge
line represented by an arc passing through the top end of the shell-like equalizer in the radial
cross-sectional shape, and an arc passing through the bottom end of the shell-like equalizer in
the radial cross-sectional shape And a plate-like portion connecting the first ridge line and the
second ridge line. [Selected figure] Figure 1
Ring type speaker
[0001]
The present invention relates to a ring-type speaker provided with an annular ring diaphragm.
[0002]
Some conventional ring-type speakers have an equalizer, a horn and the like attached to the front
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of an annular ring diaphragm in order to improve acoustic characteristics such as frequency
characteristics and directivity characteristics.
Ring-type loudspeakers with an annular ring diaphragm are often used as tweeters for the high
range. The ring diaphragm is fixedly supported on the inner periphery, and the acoustic
characteristics in the high frequency range are improved by arranging a shell-shaped equalizer of
a size comparable to the outer diameter of the ring diaphragm on the inner periphery of the ring
diaphragm (Patent Document 1).
[0003]
Furthermore, in the case of arranging a bullet-shaped equalizer, there is one that doubles this
equalizer as a member for fixedly supporting the inner periphery of an annular ring diaphragm
(Patent Document 2). In addition, when attaching a bullet-shaped equalizer, there are some that
connect an annular equalizer or a horn with a bullet-shaped equalizer to easily improve the
assembly of a ring-type speaker, or reduce the number of parts and man-hours. Literature 3).
[0004]
JP-A-57-158285 (FIG. 2) JP-A-57-69390 (FIG. 2) JP-A-56-11582 (FIG. 2)
[0005]
However, in the ring-type speaker according to the prior art, it is difficult to achieve both
improvement in acoustic characteristics and ease of assembly and reduction in the number of
parts and the number of steps.
Specifically, the acoustic characteristics and the ease of assembly are mutually influenced by the
arrangement of the bullet-shaped equalizer and the annular equalizer arranged in front of the
annular ring diaphragm. For example, when connecting a bullet-shaped equalizer and an annular
equalizer, although the number of parts and assembly man-hours can be reduced, if the
connecting part is made thin and small and structurally weakened, unnecessary vibration is
excited and abnormal noise due to vibration On the other hand, if the connecting part is made
thicker and structurally strengthened, the influence on the acoustic characteristics will be
increased, for example, the directivity characteristics will be narrowed, or the sound quality will
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be degraded. there were.
[0006]
The present invention has been made to solve the above-mentioned problems of the prior art,
and an object thereof relates to a ring type speaker, and acoustic characteristics such as
frequency characteristics and directional characteristics including suppression of unnecessary
vibration and noise. It is an object of the present invention to provide a ring type speaker capable
of achieving both the improvement of and the ease of assembly and the reduction of the number
of parts and the number of steps.
[0007]
The ring type speaker according to the present invention comprises a magnetic circuit, a voice
coil disposed in a magnetic gap of the magnetic circuit, an annular ring diaphragm to which the
voice coil is connected, and a shell-like shape disposed on the inner periphery of the ring
diaphragm. A ring type speaker comprising: an equalizer; an annular equalizer disposed on an
outer periphery of a ring diaphragm; and a plurality of radially extending plate-like connecting
arms connecting a shell-like equalizer and an annular equalizer, The connecting arm is
represented by a first ridgeline represented by an arc passing through the top end of the shelllike equalizer in a radial cross-sectional shape and a second ridge represented by an arc passing
through the bottom end of the shell-like equalizer in a radial cross-sectional shape And a platelike portion connecting the first ridge line and the second ridge line.
[0008]
Preferably, in the ring-type speaker according to the present invention, the cross-sectional shape
in the circumferential direction of the connecting arm has a first arc representing a first ridge
and a second arc representing a second ridge having a radius equal to or greater than the radius
of the first arc. And a curve representing a plate-like part
[0009]
Preferably, in the ring-type speaker according to the present invention, the radius of the first arc
increases as the connecting arm extends from the shell-shaped equalizer to the annular equalizer
in the cross-sectional shape in the circumferential direction.
[0010]
More preferably, the ring-shaped speaker according to the present invention has, in the radial
cross-sectional shape, a curve defining the cross-sectional shape from the top end to the bottom
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end of the shell-like equalizer and the cross-sectional shape from the top end to the bottom end
of the annular equalizer Are defined respectively by arcs of the same radius, and the direction of
the center line defined from the center point of these two arcs is different from the vibration
direction of the voice coil.
[0011]
More preferably, in the ring-type speaker according to the present invention, the bullet-shaped
equalizer and the connection arm having the connection hole formed at one end are integrally
resin-molded, and the annular equalizer is a connection corresponding to the connection hole of
the connection arm The inner circumference of the ring diaphragm is pinched by the bottom
surface of the bullet-like equalizer and the magnetic circuit by fastening a screw that has a hole
and connects the connection arm and the annular equalizer through the connection hole to the
screw hole of the magnetic circuit. The lower surface of the annular equalizer and the magnetic
circuit sandwich the outer periphery of the ring diaphragm, and the voice coil connected to the
ring diaphragm is disposed in the magnetic gap of the magnetic circuit.
[0012]
Still more preferably, in the ring type speaker according to the present invention, the connection
equalizer in which the bullet-shaped equalizer, the connection arm and the annular equalizer are
integrally resin-molded has screw holes corresponding to the connection holes of the magnetic
circuit. By fastening a screw penetrating through the connection hole to the screw hole of the
connection equalizer, the bottom of the bullet-shaped equalizer and the magnetic circuit
sandwich the inner periphery of the ring diaphragm, and the outer surface of the ring diaphragm
is the lower surface of the annular equalizer and the magnetic circuit A voice coil sandwiching
and connected to the ring diaphragm is disposed in the magnetic gap of the magnetic circuit.
[0013]
Still more preferably, in the ring-type speaker according to the present invention, the magnetic
circuit includes a resin-molded inner periphery fixing support member for fixing and supporting
the inner periphery of the ring diaphragm, and a resin molding for fixing and supporting the
outer periphery of the ring diaphragm And the inner peripheral fixing support member and the
outer peripheral fixing support member fixedly support the inner periphery and the outer
periphery of the ring diaphragm via the buffer member.
[0014]
Hereinafter, the operation of the present invention will be described.
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[0015]
The ring-type speaker according to the present invention includes an annular ring diaphragm, a
bullet equalizer is disposed on the inner periphery of the ring diaphragm, and an annular
equalizer is disposed on the outer periphery of the ring diaphragm.
The bullet-like equalizer and the annular equalizer are provided to improve the acoustic
characteristics such as frequency characteristics and directivity characteristics of the ring
speaker, and further to suppress unnecessary vibration and noise suppression in these
equalizers, and In order to facilitate assembly and reduce the number of parts and man-hours, a
plurality of radially extending plate-like connecting arms are provided for connecting the bullet
equalizer and the annular equalizer.
[0016]
Here, the plate-like connection arm has the conditions described below from the viewpoint of
vibration and sound.
That is, the connecting arm of the present invention is represented by a first ridge line
represented by an arc passing through the top end of the shell-like equalizer in the radial crosssectional shape and an arc passing through the bottom end of the shell-like equalizer in the radial
cross-sectional shape. And a plate-like portion connecting the first ridge line and the second ridge
line.
The plate-like connecting arm defined by the first ridge line and the second ridge line extends
from the top end to the bottom end of the bullet-shaped equalizer at the junction with the shellshaped equalizer, while it is from the inner periphery It becomes narrow and narrow
continuously as it reaches the outer periphery.
Preferably, since the first ridge line and the second ridge line are represented by arcs of the same
radius at different central positions, the radial cross-sectional shape of the plate-like connecting
arm reaches the connecting portion with the annular equalizer It becomes thin and narrow
continuously.
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That is, the shape of the plate-like connecting arm changes smoothly in the radial direction and
does not cause an extreme change in shape.
As a result, in the plurality of connecting arms, the inherent vibration mode is less likely to occur,
the bullet equalizer can be fixed firmly, and the generation of abnormal noise due to unnecessary
vibration can be reduced.
And, on the other hand, the influence of the plate-like connecting arm on the acoustic
characteristics, for example, the directional characteristics can be reduced.
[0017]
Preferably, the plate-like connecting arm has a plate-like shape having a first arc representing a
first ridge and a second arc representing a second ridge having a radius equal to or greater than
the radius of the first arc. And a curve representing a part.
More preferably, the radius of the first arc increases from the shell-shaped equalizer to the
annular equalizer.
That is, the plate-like connecting arm becomes thinner toward the top end of the bullet-like
equalizer, and the thickness in the cross-sectional shape increases toward the outer peripheral
side and the ring diaphragm. Since the first ridge line and the second ridge line are arcs and do
not constitute an acoustic one-way reflection surface, the influence on the acoustic
characteristics can be reduced along with the change of the smooth shape of the plate-like
connecting arm it can. In addition, since the direction of the draft in molding can be matched
between the shell-shaped equalizer and the connection arm, the shell-shaped equalizer can be
molded integrally with the shell-shaped equalizer and the plate-shaped connection arm. And the
plate-like connecting arm can be firmly integrated.
[0018]
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Furthermore, it is preferable that the bullet-shaped equalizer and the annular equalizer have the
following relationship in the cross-sectional shape in the radial direction. That is, a curve defining
the cross-sectional shape from the top end to the bottom end of the bullet-shaped equalizer and a
curve defining the cross-sectional shape from the upper end to the lower end of the annular
equalizer are respectively defined by arcs of the same radius, And, the direction of the center line
defined from the center point of these two arcs is different from the vibration direction of the
voice coil. That is, the direction of the midline is inclined from the inner peripheral side to the
outer peripheral side in the radial direction. Therefore, despite having the bullet-like and annular
equalizers and the plate-like connecting arms, the ring-type speaker of the present invention can
realize wider directivity characteristics.
[0019]
Preferably, in the bullet-like equalizer, a connecting arm having a connecting hole formed at one
end is integrally resin-molded, and the annular equalizer has a connecting hole corresponding to
the connecting hole of the connecting arm. That is, the bullet-shaped equalizer integrally molded
with resin and the connecting arm are connected to the annular equalizer and the magnetic
circuit by the screw as the connecting member. The screw passes through the connecting arm
and the connecting hole of the annular equalizer and is screwed into the threaded hole of the
magnetic circuit. As a result, the inner periphery of the ring diaphragm is sandwiched by the
bottom surface of the bullet equalizer and the magnetic circuit, and the outer periphery of the
ring diaphragm is sandwiched by the lower surface of the annular equalizer and the magnetic
circuit. The voice coil connected to the ring diaphragm is disposed in the magnetic gap of the
magnetic circuit, and the ring diaphragm is firmly fixed to the inner periphery and the outer
periphery thereof. Therefore, unnecessary vibration and noise can be suppressed, and at the
same time, the assembly can be simplified and the number of parts and the number of steps can
be reduced.
[0020]
Preferably, the connecting equalizer formed by integrally molding the bullet-shaped equalizer
and the connecting arm and the annular equalizer with resin is provided with a screw hole
corresponding to the connecting hole of the magnetic circuit, and the connecting member
connecting the connecting equalizer and the magnetic circuit is The inner periphery of the ring
diaphragm is sandwiched between the bottom surface of the bullet-like equalizer and the
magnetic circuit by fastening the screw penetrating the connection hole to the screw hole, and
the outer periphery of the ring diaphragm is The lower surface of the annular equalizer and the
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magnetic circuit are sandwiched, and a voice coil connected to the ring diaphragm is disposed in
the magnetic gap of the magnetic circuit. Therefore, the voice coil connected to the ring
diaphragm is disposed in the magnetic gap of the magnetic circuit, and the ring diaphragm is
firmly fixed to the inner periphery and the outer periphery thereof. Since the resin is integrally
molded by the connecting arm, unnecessary vibration and noise can be suppressed, and at the
same time, the easier assembly and the reduction of the number of parts and the number of steps
can be realized.
[0021]
More preferably, the magnetic circuit is a resin molded inner periphery fixed support member for
fixing and supporting the inner periphery of the ring diaphragm, and a resin molded outer
periphery fixed support member for fixing and supporting the outer periphery of the ring
diaphragm. Equipped with The inner peripheral fixed support member and the outer peripheral
fixed support member fixedly support the inner periphery and the outer periphery of the ring
diaphragm via the buffer member. For example, the vibration generated by the ring diaphragm is
absorbed by a cushioning member such as cotton woven fabric, urethane foam, foam rubber, felt,
etc., and it becomes difficult to propagate to the bottom of the bullet equalizer or the lower
surface of the annular equalizer. The speaker can reduce the generation of noise due to
unnecessary vibration.
[0022]
The ring-type speaker of the present invention can improve acoustic characteristics such as
frequency characteristics and directivity characteristics including suppression of unnecessary
vibration and abnormal noise, and also can facilitate assembly and reduce the number of parts
and man-hours. , Can be compatible.
[0023]
The ring type speaker according to the present invention comprises a magnetic circuit, a voice
coil disposed in a magnetic gap of the magnetic circuit, an annular ring diaphragm to which the
voice coil is connected, and a shell-like shape disposed on the inner periphery of the ring
diaphragm. An equalizer, an annular equalizer disposed on the outer periphery of the ring
diaphragm, and a plurality of radially extending plate-like connecting arms connecting the shellshaped equalizer and the annular equalizer, wherein the connecting arms are arranged in the
radial direction. In the cross-sectional shape of the first ridge line represented by an arc passing
through the top end of the bullet equalizer, the second ridge line represented by the arc passing
through the bottom end of the bullet equalizer in the radial cross section shape, the first ridge
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line and It implement | achieved by providing the plate-like part which connects a 2nd ridgeline.
[0024]
Hereinafter, although the ring-type speaker by the preferable embodiment of this invention is
demonstrated, this invention is not limited to these embodiment.
[0025]
FIG. 1 is a view for explaining a ring-type speaker 1 according to a preferred embodiment of the
present invention, FIG. 1 (a) is a front view, FIG. 1 (b) is Sec.
It is a sectional view of B-O-A.
Furthermore, FIG. 2 (a) shows Sec.
FIG. 2B is a partial enlarged cross-sectional view of B-O. It is a partial expanded sectional view
about O-A. The ring type speaker 1 is a tweeter for high frequency range reproduction provided
with a ring diaphragm 2, a shell-shaped equalizer 11 is on the inner peripheral side of the ring
diaphragm 2, and an annular equalizer 12 is on the outer peripheral side of the ring diaphragm
2. Be placed.
[0026]
The ring speaker 1 includes a magnetic circuit including a yoke 4, a plate 5, a main magnet 6,
and a sub magnet 7, and the magnetic diaphragm defined by the yoke 4 and the plate 5 includes
a ring diaphragm 2. And a voice coil 3 to be connected thereto. When a current is applied to the
voice coil 3, the ring diaphragm 2 vibrates and a sound wave is emitted. Specifically, the ring
diaphragm 2 has, for example, an inner periphery and an outer periphery fixedly supported by
using a laminate of a synthetic fiber woven fabric coated with a resin such as acryl or urethane
with a urethane film as a substrate. The ring-shaped diaphragm has a cross section in which two
convex rolls are connected, and a bobbin on which a voice coil is wound is connected to a
connecting portion of the roll at the center of the ring. The ring diaphragm 2 has its inner
periphery and outer periphery fixed and supported by an inner periphery fixing and supporting
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member 9 and an outer periphery fixing and supporting member 10 which are resin-molded.
Specifically, the inner periphery of the ring diaphragm 2 is sandwiched between the bottom
surface of the shell-like equalizer 11 and the inner peripheral fixed support member 9 through
the cotton cloth (felt) 21 of the buffer member, and the outer periphery of the ring diaphragm 2
is The lower surface of the annular equalizer 12 and the outer peripheral fixed support member
10 are sandwiched between the cotton cloth 22 of the buffer member.
[0027]
The yoke 4 has a through hole at the center, which together with the cover 8 of the magnetic
circuit defines a cavity. The inner peripheral fixed support member 9 is provided with a through
hole through which the air on the inner peripheral back side of the ring diaphragm 2 is
ventilated with the yoke 4 and the cavity of the cover 8. The cover 8 of the magnetic circuit is
preferably resin-molded to a thick and strong shape so as not to generate an unnecessary sound
due to the vibration generated in the magnetic circuit, and attached to the outer peripheral
portion of the under plate of the yoke 4 Be
[0028]
FIG. 3 is a diagram for explaining the bullet-shaped equalizer 11. FIG. 3 (a) is a front view, FIG. 3
(b) is a side view, and FIG. 3 (c) is a cross section of the connecting arm in the side view. It is
sectional drawing showing c1-c5. In the bullet-shaped equalizer 11, a bullet-shaped bullet
portion 110 and four plate-shaped connecting arms 111 are integrally resin-molded, and an end
of the connecting arm 111 is an annular equalizer 12 and a magnet by a screw 13. A through
hole 112 is provided which connects with the plate 5 of the circuit. The cannonball portion 110
has a cannonball shape extending from the top end O to the bottom end C, the cross-sectional
shape of which is defined by a curve 113 partially shown in the partially enlarged cross-sectional
view of FIG. The connecting arm 111 has a first ridge line 114 whose radial cross-sectional shape
is represented by a circular arc passing through the top end O of the shell 110 and a first ridge
line whose radial cross-sectional shape passes the bottom end C of the shell 110 It is defined
from a second ridge 115 represented by an arc of the same radius and a plate-like portion 116
connecting the first ridge 114 and the second ridge 115.
[0029]
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The shape of the plate-like connecting arm 111 changes smoothly in the radial direction. The
plate-like connecting arm 111 extends from the top end O to the bottom end C of the shell
portion 110 at the portion connected to the shell portion 110, while the first connection arm
111 extends from the inner peripheral side to the outer peripheral side. The cross-sectional
shape in the radial direction defined by the ridge line 114 and the second ridge line 115 is
continuously narrowed. The first ridge line 114 and the second ridge line 115 are represented by
arcs of the same radius ra at different central positions, and as is apparent from the crosssectional view, the radial cross-sectional shape along the connecting portion with the annular
equalizer 12 Becomes narrower continuously. The plurality of connecting arms have their
respective first ridge lines coincident with the top apex O of the shell 110.
[0030]
The plate-like connecting arm 111 has a first arc 117 representing the first ridge line 114 and a
first arc 117 representing the first ridge line 114, as shown in the sectional views c1 to c5 in FIG.
It is defined from a second arc 118 representing a second ridge 115 having a radius rd equal to
or greater than the radius rc, and curves 119 and 120 representing the plate-like portion 116.
The curve 119 or the curve 120 is a curve connecting one end of the first arc 117 and one end
of the second arc 118, which may be an arc or includes a straight line. In addition, as the
connecting arm 111 extends from the shell 110 to the connecting hole 112, the radius rc of the
first arc 117 increases. Since the radius rd of the second arc 118 is a value equal to or greater
than the radius rc of the first arc 117, the plate-like connecting arm 111 is thinner toward the
top end O of the shell 110, on the outer circumferential side, and As it gets closer to the
diaphragm 2, the thickness in the cross-sectional shape increases. The cross sectional shape in
the circumferential direction of the connecting arm 111 may be in the above relationship within
the range of the inner periphery and the outer periphery of the ring diaphragm 2 in the radial
direction, that is, in the front direction of the vibrating portion of the ring diaphragm 2 .
[0031]
The radius rc of the first circular arc 117 and the radius rd of the second circular arc 118 do not
need to have an extremely large difference, and may be a dimensional difference that defines the
direction of the draft in mold processing. The direction of the draft corresponds to the direction
of the draft of the shell 110, and the separation line (parting line) between the upper mold and
the lower mold of the mold is close to the bottom of the bullet equalizer 11 and the connecting
arm 111. The manufacturing cost of the integrally molded bullet-shaped equalizer 11 and the
connecting arm 111 is reduced.
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[0032]
The plurality of connection arms 111 are resin-molded integrally with the shell 110 to form the
shell-shaped equalizer 11. By connecting the through hole 112 of the shell-shaped equalizer 11
and the annular equalizer 12 and the plate 5 of the magnetic circuit by the screw 13, the shellshaped equalizer 11 can be firmly fixed. At this time, since the inner periphery and the outer
periphery of the ring diaphragm 2 are simultaneously fixed and supported, the assembly of the
ring-type speaker 1 is completed. By the plurality of connecting arms 111, the bullet-shaped
equalizer 11 and the annular equalizer 12 are strongly connected, and generation of abnormal
noise due to unnecessary vibration of the equalizer exposed on the surface of the ring-type
speaker 1 can be reduced.
[0033]
FIG. 4 is a view for explaining the vibration characteristics of the bullet-shaped equalizer 11. As
shown in FIG. FIG. 4 (a) is a front view of the ring speaker 1, and FIG. 4 (b) is a frequency
characteristic diagram showing the vibration acceleration characteristic at the point X of the
shell-shaped equalizer 11. As shown in FIG. The characteristic of the solid line (i) is an
embodiment of the present invention in which the bullet equalizer 11 and the annular equalizer
12 are strongly connected by a plurality of connection arms 111. In addition, the characteristic
of the broken line (ii) is a comparative example, in which the connecting arm connecting the
shell-shaped equalizer 11 and the annular equalizer 12 is not provided. By providing the platelike connecting arm 111 as in the embodiment of the present invention in almost the entire band
except a part, the vibration acceleration at the point X of the bullet-like equalizer 11 is reduced.
Therefore, abnormal noise due to unnecessary vibration of the equalizer can also be reduced, and
a ring-type speaker with improved sound quality can be realized.
[0034]
In a preferred embodiment, the inner periphery of the ring diaphragm 2 is sandwiched between
the bottom surface of the shell-like equalizer 11 and the inner periphery fixed support member 9
via the buffer member 21, and the outer periphery of the ring diaphragm 2 is The lower surface
of the annular equalizer 12 and the outer peripheral fixed support member 10 sandwich the
lower surface of the annular equalizer 12 via In the embodiment of the present invention, cotton
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woven fabric (felt) is used as the buffer member, but preferably foamed urethane may be used,
and foam rubber may be used. The ring-type speaker 1 can reduce the generation of noise due to
unnecessary vibration.
[0035]
And, on the other hand, in the ring type speaker 1, the influence of the plate-like connecting arm
111 on the acoustic characteristics, for example, the directional characteristics can be minimized.
The shape of the cross section of the connecting arm 111 in the circumferential direction is
defined by the arcs represented by the first arc 117 and the second arc 118, and does not
constitute an acoustic one-way reflecting surface. Further, the shape of the cross section in the
radial direction of the plate-like connection arm 111 changes smoothly. With the change of the
smooth shape, the volume per unit length in the radial direction of the plate-like connecting arm
111 gradually decreases from the inner circumferential side to the outer circumferential side.
Therefore, even when the angle of the measurement direction in the directional characteristic is
wide, the influence of the connecting arm 111 on the acoustic characteristic is reduced, for
example, the directional characteristic can be broadened or the deterioration of the sound quality
can be prevented.
[0036]
In the present embodiment, the annular equalizer 12 is smaller in height than the shell-shaped
equalizer 11, in other words, the thickness from the upper end to the lower end of the annular
equalizer 12 is small. Curve 123 defining the cross-sectional shape from the upper surface end to
the lower surface end of annular equalizer 12 is defined by an arc of the same radius rb as curve
113 defining the cross-sectional shape from top end O to bottom end C of shell 110 Ru. 2 (a) and
2 (b) are partially enlarged sectional views, the center point of the arc 123 and the center point
of the arc 113 are not described, and are defined from the center points of these two arcs. The
middle line L is a perpendicular bisector of a line connecting the center point of the arc 123 and
the center point of the arc 113. The midline L is different from the vibration direction of the
voice coil 3 whose direction is equal to the vertical axis direction Z. As a result, the direction of
the midline L is inclined from the inner peripheral side to the outer peripheral side in the radial
direction. The curve 113 and the curve 123 may be arcs of the same radius within a range in
which they are in line symmetry with each other with respect to the midline L.
[0037]
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FIG. 5 is a diagram for explaining the directivity characteristic of the ring speaker 1. FIG. 5 (a)
shows the directional pattern of the ring type speaker 1 having the connecting arm 111 of the
first embodiment, and FIG. 5 (b) does not have the connecting arm of the comparative example. A
curve 113 defining the cross-sectional shape from the top end O to the bottom end C of the shell
110 and a curve 121 defining the cross-sectional shape from the upper end to the lower end of
the annular equalizer 12 are line symmetrical It is a directional characteristic pattern of a ring
type speaker. The frequency is common at 19.95 kHz. In the comparative example, a deep dip
occurs between the directional beams (about 30 ° direction) generated in the front face 0 °
direction and about 45 ° direction, but in the case of including the connecting arm 111 of the
first embodiment, such a A deep directional pattern can be realized without deep dipping.
Therefore, the ring-type speaker 1 of the present invention can realize wider directivity
characteristics although the bullet-shaped equalizer 11 and the annular equalizer 12 are
provided and the plate-shaped connecting arm 111 is further provided.
[0038]
At the same time, in the ring-type speaker 1 of the present embodiment, simplification of
assembly and reduction of the number of parts and the number of steps are realized. Since the
bullet-shaped equalizer 11 and the connecting arm 111 are integrated and, in addition, the ring
diaphragm 2 is fixedly supported by the resin-molded inner peripheral fixing support member 9
and the outer peripheral fixing support member 10, When assembling the ring-type speaker 1,
the ring diaphragm 2 can be fixed by connecting the screws 13, and no adhesive is used. Even if
the voice coil 3 is broken, repair is hardly possible if an adhesive is used, but the ring diaphragm
2 and the voice coil 3, and if necessary, the inner circumferential fixed support member 9 or the
outer circumferential fixed support member 10 There is an advantage that it is sufficient to
replace the
[0039]
Furthermore, in order to facilitate the assembly, the bullet-shaped equalizer 11 and the inner
circumference fixed support member 9 may be provided with the shaft portion 121 and the
bearing portion 91 fitted to each other. Furthermore, if a through hole corresponding to the shaft
portion 121 or the bearing portion 91 is provided in the inner peripheral portion of the ring
diaphragm 2, when assembling the ring type speaker 1, the shaft portion 121 or the inner
periphery of the bullet-shaped equalizer 11 is fixed. The bearing portion 91 of the support
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member 9 serves as a guide, and the ring diaphragm 2 can be easily arranged. Therefore, the
reduction of man-hours is realized.
[0040]
In the present invention, the number of connection arms 111 is not limited to four. The number
is sufficient as long as the bullet-shaped equalizer 11 is firmly fixed. Further, the bullet-shaped
equalizer 11 and the connecting arm 111 are not limited to integral molding of resin. It may be
integrally molded by injecting a metal such as aluminum into a mold. The ring diaphragm 2 may
be a flat diaphragm. It may be a ring diaphragm in which the inner periphery and the outer
periphery are fixed, and is not limited to the diaphragm shape.
[0041]
FIG. 6 is a view for explaining a ring-type speaker 61 according to another preferred embodiment
of the present invention. 6 (a) is a front view, and FIG. 6 (b) is Sec. It is a sectional view of B-O-A.
In addition, in FIG. 6, description of the part which is common in Example 1 demonstrated in FIG.
1 is abbreviate | omitted.
[0042]
The ring-type speaker 61 is a tweeter for high-range reproduction including the ring diaphragm
2, and the bullet-shaped equalizer 11 is on the inner peripheral side of the ring diaphragm 2 and
the annular equalizer 12 is on the outer peripheral side of the ring diaphragm 2. Be placed. Here,
the four plate-like connecting arms 111 are resin-molded integrally with the shell-shaped
equalizer 11 and the annular equalizer 12, and connect the shell-shaped equalizer 11 and the
annular equalizer 12. That is, the connection equalizer 62 in which the bullet-shaped equalizer,
the connection arm and the annular equalizer are integrally resin-molded is formed.
[0043]
The connection equalizer 62 is provided with a screw hole corresponding to the connection hole
of the magnetic circuit on the bottom side of the bullet-shaped equalizer 11. One screw 63
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connects the connection equalizer 62, the magnetic circuit, and the cover 8 of the magnetic
circuit. Specifically, the magnetic circuit is an inner magnetic type magnetic circuit configured of
the yoke 4, the plate 5 having the through hole on the inner peripheral side, and the magnet 6,
and the resin in the inner peripheral side through hole of the plate 5 The outer peripheral fixed
support member 10 is attached to the outer peripheral part of the yoke 4 by molding the inner
peripheral fixed support member 9. The screw 63 passes through the bearing portion of the
inner peripheral fixed support member 9 of the magnetic circuit and the connection hole
provided in the cover 8 of the magnetic circuit and is screwed into the screw hole of the
connection equalizer 62 to connect the connection equalizer 62 and the magnetic circuit And
fasten the cover 8 of the magnetic circuit. The outer periphery fixed support member 10 doubles
as a terminal plate.
[0044]
As a result, the inner periphery of the ring diaphragm 2 is sandwiched between the bottom of the
bullet equalizer 11 and the inner fixed support member 9 attached to the magnetic circuit, and
the outer periphery of the ring diaphragm 2 is attached to the lower surface of the annular
equalizer 12 and the magnetic circuit The outer peripheral fixed support member 10 is
sandwiched, and the voice coil 3 connected to the ring diaphragm 2 is disposed in the magnetic
gap of the magnetic circuit. The voice coil 3 connected to the ring diaphragm 2 is disposed in the
magnetic gap of the magnetic circuit, and the ring diaphragm 2 is firmly fixed to the inner
periphery and the outer periphery thereof.
[0045]
The ring-type speaker 61 includes the connection equalizer 62 in which the bullet-shaped
equalizer 11 and the annular equalizer 12 are integrally resin-molded by the connection arm
111. Therefore, unnecessary vibration and noise are suppressed. Further, since one screw 63 for
connecting the connection equalizer 62 and the magnetic circuit is sufficient, it is possible to
realize further simplification of assembly and reduction of the number of parts and the number
of steps. Of course, a plurality of screws may be used to connect the connection equalizer 62 and
the magnetic circuit.
[0046]
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Further, in the cross-sectional shape in the radial direction of the concatenated equalizer 62 of
the second embodiment, the height of the annular equalizer 12 is lower than the height of the
shell-shaped equalizer 11. The height from the upper surface end to the lower surface end of the
annular equalizer 12 may be lower than the height of the shell-shaped equalizer 11, and
preferably may be equal to the height of the shell-shaped equalizer 11. Curve 123 defining the
cross-sectional shape from the upper surface end to the lower surface end of annular equalizer
12 is defined by an arc having the same radius as curve 113 defining the cross-sectional shape
from top end O to bottom end C of shell 110 Furthermore, the direction of the center line L
defined from the center point of these two arcs is different from the vibration direction Z of the
voice coil 3, and as a result, the direction of the center line L is from the radially inner
circumferential side It suffices to be inclined to the outer peripheral side. The ring type speaker
of the present invention can realize wide directivity characteristics.
[0047]
The ring-type speaker of the present invention is not limited to the tweeter for high-range
reproduction, and can also be applied to a full range speaker and other speakers for middle-low
range reproduction. A shell-shaped equalizer is arranged on the inner peripheral side of the ring
diaphragm, and an annular equalizer is arranged on the outer peripheral side of the ring
diaphragm, which is suitable for a speaker provided with a connecting arm.
[0048]
It is a figure explaining the ring-type speaker by preferable embodiment of this invention.
(Example 1) It is a figure explaining the ring type speaker by preferred embodiment of this
invention. (Example 1) FIG. 6 is a diagram for explaining a shell-like equalizer according to a
preferred embodiment of the present invention. (Example 1) It is a figure explaining the vibration
characteristic of the shell-shaped equalizer according to the preferred embodiment of the present
invention. (Example 1) It is a figure explaining the directivity characteristic of the ring type
speaker by preferable embodiment of this invention. (Example 1) It is a figure explaining the ring
type speaker by other preferable embodiment of this invention. (Example 2)
Explanation of sign
[0049]
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17
Reference Signs List 1 ring speaker 2 ring diaphragm 3 voice coil 4 yoke 5 plate 6 main magnet
7 sub magnet 8 cover 9 inner circumferential fixed support member 91 bearing portion 10 outer
circumferential fixed support member 11 shell-shaped equalizer 12 annular equalizer 111
connecting arm 112 through hole 114 1st ridgeline 115 2nd ridgeline 116 plate-like part 117
1st circular arc 118 2nd circular arc 121 axial part 61 ring type speaker 62 connection equalizer
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18
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