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DESCRIPTION JP2010288099

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DESCRIPTION JP2010288099
[PROBLEMS] To provide a thin and compact speaker with high input resistance and large output.
A speaker 1 includes a magnetic circuit 5 having a yoke 2, a magnet 3 and a pole piece 4, a
vibration system 13 having a voice coil 11 and a diaphragm 9 connected via a voice coil bobbin
12, and these magnetic circuits. 5 and a frame 8 for holding a vibration system 13, and the voice
coil 11 is disposed in the magnetic gap 6. Further, a damper 14 is provided between the lower
end of the voice coil bobbin 12 and the magnet 3 and supports the vibration system 13
vibratably with respect to the magnet 3. [Selected figure] Figure 2
スピーカ
[0001]
The present invention relates to a thin and small speaker used for headphones, earphones,
headsets, mobile phones and the like.
[0002]
Conventionally, a thin and small speaker is known in which a damper having a general structure
(see Patent Document 1) is adopted for a large-sized speaker (see Patent Document 2).
The damper plays the role of holding the vibration system in the correct position and realizing
the accurate vibration of the vibration system together with the edge portion around the
diaphragm.
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1
[0003]
JP-A-7-203585 JP-A-2000-209693
[0004]
In the conventional thin speaker, a damper is added between the diaphragm and the lower frame
to support the upper part of the voice coil bobbin, but the addition of the damper not only
impairs the thinness of the speaker, but the thin speaker Although the distance to the diaphragm
can not be increased, and a damper is added, there is a problem that the vibration system can not
accurately vibrate and causes rolling if a large power is applied.
[0005]
It is an object of the present invention to provide a thin and compact speaker with high input
resistance and high output while effectively adding a damper without losing the thinness of the
speaker.
[0006]
The present invention comprises a magnetic circuit having a yoke, a magnet and a pole piece, a
vibration system having a voice coil and a diaphragm connected via a voice coil bobbin, and a
frame for holding the magnetic circuit and the vibration system. In the speaker in which the voice
coil is disposed in the gap, a damper is provided between the voice coil bobbin and the magnet,
and a damper is provided for vibratably supporting the vibration system with respect to the
magnet.
[0007]
In the present invention, it is preferable to appropriately add the following configurations (a) to
(e).
(A) The damper is formed in a ring shape, and connects the entire circumference of the voice coil
bobbin to the magnet.
(A) The damper connects the end of the voice coil bobbin on the opposite side to the diaphragm
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2
side to the magnet.
(C) A voice coil bobbin in which the diaphragm, the voice coil bobbin and the damper are
separately formed, or the damper is integrally formed with the voice coil bobbin, or the damper
is integrally formed with a dome portion of the diaphragm And form separately.
(D) A damper fixing member is provided which is formed in a ring shape that can be fitted to the
magnet and fixes the magnet side end of the damper. (E) In the above (D), the damper fixing
member is made of metal or resin made of nonmagnetic material.
[0008]
According to the present invention, since a damper is provided between the voice coil bobbin and
the magnet for vibratably supporting the vibration system with respect to the magnet, a space
not conventionally used between the pole piece and the yoke is made effective. A damper can be
added without securing a space by using it. In addition, the thickness of the speaker can be
maintained as it is, and the distance between the edge part around the diaphragm and the
damper can be extended, and the upper end and the lower part of the vibration system are
supported at two points of the edge part around the diaphragm and the damper However, the
vibration system does not easily cause rolling, stable and accurate vibration of the vibration
system can be obtained, and input performance can be improved. As a result, it is possible to
provide a thin and compact speaker with high input resistance and high output. In addition, it
becomes possible to cope with further thinning of the speaker.
[0009]
Further, according to the present invention, when the configuration of (A) is added, the damper is
formed in a ring shape, and the entire circumference of the voice coil bobbin is connected to the
magnet, so it is higher than the damper connecting multiple parts of the voice coil bobbin to the
magnet A position holding function can be obtained, and more stable and accurate vibration of
the vibration system can be obtained. When adding the configuration of (A), the damper connects
the end of the voice coil bobbin on the opposite side to the diaphragm side to the magnet, so the
thickness of the speaker remains the maximum distance between the edge part around the
diaphragm and the damper The upper end and the lower end of the vibration system are
supported by two points at the edge around the diaphragm and the damper, compared to the
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damper that connects the end of the voice coil bobbin other than the end opposite to the
diaphragm to the magnet A high position holding function can be obtained, and more stable and
accurate vibration of the vibration system can be obtained. When the diaphragm, the voice coil
bobbin and the damper are separately formed out of the configuration of (C), it becomes possible
to select and use the optimum material for each of the diaphragm, the voice coil bobbin and the
damper. When the damper is formed integrally with the voice coil bobbin or the damper is
formed separately from the voice coil bobbin integrally formed with the dome portion of the
diaphragm, the number of parts of the vibration system and the number of assembly steps are
reduced. Productivity can be improved. When adding the configuration of (D), it is formed in a
ring shape that can be fitted to the magnet, and a damper fixing member is provided to fix the
magnet side end of the damper. Therefore, the work of fixing the magnet side end of the damper
to the magnet Can be performed easily and accurately, and productivity can be improved. For
example, a plane parallel to the vibration direction of the vibration system or a plane
perpendicular to the vibration direction of the vibration system according to the shape, size, etc.
of the magnet The magnet side end of the damper can be used easily and accurately. When the
configuration of (e) is added, the damper fixing member does not affect the magnetic circuit
because the damper fixing member is made of metal or resin made of nonmagnetic material.
[0010]
BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the speaker by
embodiment of this invention (Example 1). BRIEF DESCRIPTION OF THE DRAWINGS The
principal part expanded sectional view of the speaker by embodiment of this invention (Example
1). BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of the flame | frame of the
speaker by embodiment of this invention (Example 1). The principal part expanded sectional view
of the other speaker by embodiment of this invention (Example 2). The principal part expanded
sectional view of the other speaker by embodiment of this invention (Example 3). The principal
part expanded sectional view of the other speaker by embodiment of this invention (Example 4).
The principal part expanded sectional view of the other speaker by embodiment of this invention
(Example 5).
[0011]
Hereinafter, Examples 1 to 5 as an embodiment of the present invention will be described in
detail based on the drawings.
[0012]
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4
FIG. 1 is a cross-sectional view of a speaker according to a first embodiment of the present
invention.
The speaker 1 is mounted and fixed on the upper surface of the magnet 3 with a bottomed
cylindrical yoke 2 made of a magnetic material, a cylindrical magnet 3 made of a permanent
magnet mounted and fixed in the yoke 2, and the upper surface of the magnet 3. A disk-shaped
pole piece 4 made of a magnetic material sandwiching the magnet 3 with the bottom plate
portion constitutes a circular inner magnetic type magnetic circuit 5. The diameter of the pole
piece 4 is smaller than the inner diameter of the yoke 2, and the gap between the outer
peripheral surface of the pole piece 4 opposed in the radial direction of the magnetic circuit 5
and the inner peripheral surface of the peripheral side wall of the yoke 2 is the magnetic circuit
of the magnetic circuit 5. It is gap 6. The diameter of the magnet 3 is smaller than that of the
pole piece 4, and a space is formed between the outer peripheral edge of the pole piece 4
projecting radially outward from the magnet 3 and the bottom plate of the yoke 2 located
therebelow. It has become seven.
[0013]
The outer peripheral edge of a circular diaphragm 9 is adhesively fixed to the outer peripheral
edge of the frame 8, and the diaphragm 9 is disposed above the speaker 1. The diaphragm 9 has
a dome-shaped dome portion (a top surface is concave and a reverse dome portion whose bottom
surface is convex) 9a having a convex upper surface and a concave lower surface at the central
portion, and the entire periphery of the dome portion 9a , And has a circular ring-shaped edge 9b
surrounding it. The diaphragm 9 is formed by separately forming the dome portion 9a and the
edge portion 9b, and bonding and fixing the outer peripheral edge portion of the dome portion
9a and the inner peripheral edge portion of the edge portion 9b. A circular diaphragm ring 10 is
adhesively fixed to the lower surface of the outer peripheral edge portion (the outer peripheral
edge portion of the diaphragm 9) of the edge portion 9b, and the outer peripheral edge portion
of the diaphragm 9 is the outer peripheral edge of the frame 8 via the diaphragm ring 10. It is
adhesively fixed to the part. The diaphragm 9 is supported so as to be capable of vibrating in the
vertical direction with respect to the frame 8 at an edge portion 9 b around the diaphragm 9.
[0014]
A cylindrical voice coil 11 is coupled to the lower surface of a circular boundary between the
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dome 9a and the edge 9b of the diaphragm 9, and the voice coil 11 reciprocates in the vertical
direction in the magnetic gap 6 of the magnetic circuit 5 (vibration ) Is possible insert
arrangement. The voice coil 11 is formed by winding a wire of good conductivity around the
outer peripheral surface of a cylindrical voice coil bobbin 12, and the upper end of the voice coil
bobbin 12 is a circular boundary of the dome 9a and the edge 9b of the diaphragm 9. The voice
coil 11 is inserted and disposed in the magnetic gap 6 of the magnetic circuit 5 so as to be
capable of reciprocating (oscillating) in the vertical direction.
[0015]
The voice coil 11 and the diaphragm 9 connected by the voice coil bobbin 12 constitute a
vibration system 13. The edge portion 9b around the diaphragm 9 allows the vibration system
13 to reciprocate (oscillate) in the vertical direction with respect to the frame 8. Is supported.
[0016]
Thus, the magnetic circuit 5 having the yoke 2, the magnet 3 and the pole piece 4, the vibration
system 13 having the voice coil 11 and the diaphragm 9 connected via the voice coil bobbin 12,
the magnetic circuit 5 and the vibration system The speaker 1 including the frame 8 for holding
the voice coil 13 and the voice coil 11 disposed in the magnetic gap 6 is connected to the voice
coil 11 when current flows from the external circuit through the pair of external connection
terminals (not shown). The voice coil 11 reciprocates in the vertical direction by the interaction
between the magnetic flux flowing substantially horizontally and the current supplied to the
voice coil 11, and the motion is transmitted to the diaphragm 9 by the voice coil bobbin 12, and
the diaphragm 9 vibrates up and down with a peripheral edge 9b at the periphery as a fulcrum to
make a sound.
That is, the electrical signal is converted to sound.
[0017]
As shown in FIG. 2, such a speaker 1 is provided with a damper 14 provided between the voice
coil bobbin 12 and the magnet 3 and supporting the vibration system 13 vibratably with respect
to the magnet 3. The damper 14 is made of a resin film and is provided between the magnet 3
and the voice coil bobbin 12 opposed to each other in the radial direction of the magnetic circuit
5 below the magnetic gap 6 of the magnetic circuit 5. In this case, the inner end (the end on the
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magnet 3 side) is coupled to the magnet 3, the outer end (the end on the voice coil 11 side) is
coupled to the voice coil bobbin 12, and the lower part of the vibration system 13 (below the
magnetic gap 6) The portion (on the side) is vibratably supported with respect to the magnet 3,
holds the vibration system 13 in the correct position, and realizes the accurate vibration of the
vibration system 13 together with the edge 9b around the diaphragm 9. It is the one to bear.
[0018]
Thus, since the speaker 1 is provided between the voice coil bobbin 12 and the magnet 3 and the
damper 14 supporting the vibration system 13 vibratably to the magnet 3 is provided, the
speaker 1 is used conventionally between the pole piece 4 and the yoke 2 The damper 14 can be
added without using space 7 which has not been used and securing space specially. In addition,
the thickness of the speaker 1 can be maintained as it is, and the distance between the edge
portion 9 b around the diaphragm 9 and the damper 14 can be increased, and the upper end and
the lower portion of the vibration system 13 at two points of the edge portion 9 b around the
diaphragm 9 and the damper 14 Even if a large power is applied, the vibration system 13 does
not easily cause rolling (right and left shake), stable and accurate vibration of the vibration
system 13 can be obtained, and input performance can be improved. As a result, it is possible to
provide a thin and compact speaker with high input resistance and high output. In addition, it
becomes possible to cope with further thinning of the speaker.
[0019]
Here, although the damper 14 may be a planar damper disposed in a plane perpendicular to the
axial line (center line) of the magnetic circuit 5, concentric circles may be provided on the
damper 14 so as to obtain a larger amplitude of the vibration system 13. The waveform is
attached.
[0020]
The damper 14 may be a damper that connects a plurality of points at equal intervals in the
circumferential direction of the voice coil bobbin 12 to the magnet 3, but a higher position
holding function can be obtained compared to the damper, and more stable and accurate
vibration of the vibration system 13 As can be obtained, the damper 14 is formed in a ring shape
to connect the entire circumference of the voice coil bobbin 12 to the magnet 3.
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In the case of the ring-shaped damper 14, a hole for securing the required air permeability is
opened to achieve both the damper function required for the damper 14 and the air permeability.
[0021]
The damper 14 may be a damper that connects the magnet 3 except for the lower end of the
voice coil bobbin 12 (the end opposite to the diaphragm 13) (but the lower part of the magnetic
gap 6) to the magnet 3. The damper 14 connects the lower end of the voice coil bobbin 12 to the
magnet 3 so that the position holding function is obtained and the vibration of the vibration
system 13 is more stable and accurate, and the thickness of the speaker 1 remains as it is the
edge around the diaphragm 9 The distance between the portion 9 b and the damper 14 can be
maximized, and the upper end and the lower end of the vibration system 13 are supported at two
points of the edge portion 9 b around the diaphragm 9 and the damper 14.
[0022]
The diaphragm 9, the voice coil bobbin 12 and the damper 14 are separately formed, and it
becomes possible to select and use optimum materials for the diaphragm 9, the voice coil bobbin
12 and the damper 14 respectively.
Of course, since the dome portion 9a and the edge portion 9b of the diaphragm 9 are separately
formed, optimum materials can be selected and used for the dome portion 9a and the edge
portion 9b.
[0023]
A circular damper ring 15 made of metal or resin made of nonmagnetic material that can be
externally fitted to the magnet 3 is adhered and fixed to the end of the damper 14 on the magnet
3 side, and the magnet 3 side end of the damper 14 via the damper ring 15 The portion is
adhesively fixed to the outer peripheral surface of the magnet 3. Thus, by providing the damper
ring 15 which is formed into a ring shape that can be fitted to the magnet 3 and which fixes the
end of the damper 14 on the side of the magnet 3, the end of the magnet 3 on the side of the
magnet 3 is provided. The work of fixing to the magnet 3 is easy and accurate, and productivity
can be improved, and a plane parallel to the vibration direction of the vibration system 13
according to, for example, the shape, size, etc. of the magnet 3 (vertical plane: damper The outer
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8
peripheral surface of the ring 15 and the surface perpendicular to the vibration direction of the
vibration system 13 (horizontal surface: upper and lower end surfaces of the damper ring 15)
can be properly used to easily and accurately fix the magnet 3 side end of the damper 14 .
Moreover, since the damper ring 15 is made of metal or resin made of nonmagnetic material, it
does not affect the magnetic circuit 5.
[0024]
By the way, as shown in FIG. 3, the yoke 2 and the frame 8 are integrally formed by pressing one
sheet of metal material.
[0025]
That is, the central portion and the peripheral portion of a sheet of sheet metal material
(magnetic material) are drawn respectively to raise the cylindrical outer wall from the outer
peripheral edge of the disk-shaped bottom plate and to have a smaller diameter than the outer
wall The inner wall of the double-walled cylinder is raised with a certain distance from the discshaped bottom plate to the inside of the outer wall, and the inner wall of the double-wall is The
bottomed cylindrical yoke 2 is formed in the central portion by a circular bottom plate 2a
consisting of a bottom plate central portion rising from the outer peripheral edge and a
cylindrical peripheral side wall 2b consisting of an inner wall of a double wall; A cylindrical, ringshaped bottom plate 8a consisting of a bottom plate peripheral portion raising the outer wall of
the heavy wall from the inner periphery and a rim of the bottom plate raising the outer wall from
the outer periphery; It is opened upward around the yoke 2 by the inner peripheral side wall 8b
and the outer peripheral side wall 8c which is an outer side wall. It is formed in the peripheral
portion of the circular ring-like frame 8 having a shaped cross-sectional shape.
[0026]
The yoke 2 is formed by raising the bottom plate 2a one step higher than the bottom plate 8a of
the frame 8 and providing a shallow circular recess 16 (see FIG. 1) on the back side of the yoke
2. Side wall 2b is formed higher than inner peripheral side wall 8b (double wall) of frame 8 and
higher than outer peripheral side wall 2b of yoke 8 of outer peripheral side wall 8c of frame 8
and inner peripheral side wall 8b (double wall) of frame 8 A step 17 is provided horizontally, and
the outer peripheral side wall 8c of the frame 8 above the step 17 is formed larger in diameter
than the outer peripheral side wall 8c of the frame 8 below the step 17.
The outer peripheral edge portion of the edge portion 9 b around the diaphragm 9 is adhesively
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9
fixed to the stepped portion 17 via the diaphragm ring 10.
[0027]
The pressing process includes a drilling process, and at least two or more openings are provided
in the disk-shaped bottom plate of an integral structure of the yoke 2 and the frame 8 and
formed at one position in the central portion of the bottom plate 2a of the yoke 2. Circular first
opening 18, a pair of second openings 19 formed in two symmetrical locations at 180 ° points
in the outer peripheral edge of the bottom plate 2a of the yoke 2, and 180 ° points in the outer
peripheral edge of the bottom plate 2a of the yoke 2 The inner peripheral edge of the bottom
plate 8 a of the frame 8 extends from two symmetrical 180 ° point positions that are 90 ° out
of position in one direction with two symmetrical second portions 19. It forms continuously to
two 180 ° point symmetrical locations in the part, and forms notches 20 at two 180 ° point
symmetric positions on the circumferential side wall 2 b of the yoke 2 and the inner
circumferential side wall 8 b (double wall) of the frame 8 Pair of third openings 21, and At two
180 ° symmetrical points in the bottom plate 8a of the eight, and a pair of third openings 21
are displaced by approximately 45 ° in one direction (direction of displacement of the pair of
third openings 21 relative to the pair of second openings 19) It extends from the two
symmetrical 180 ° points radially inward to the upper end (folded portion of the double wall) of
the inner peripheral side wall 8b of the frame 8, and the outer peripheral wall of the recess 16
(yoke 2) A pair of fourth openings 23 which form notches 22 at two 180 ° point symmetrical
positions in the lower part of the inner peripheral side wall 8 b of the frame 8 below the bottom
plate 2 a are provided.
[0028]
With such an integral structure of the yoke 2 and the frame 8, the yoke 2 and the frame 8 can be
integrally formed by simple press processing, and the number of parts of the speaker 1 and the
number of assembly steps can be reduced to improve productivity.
In addition, the thickness of the speaker 1 can be reduced to easily ensure the necessary
strength, and the speaker 1 can be further reduced in size and size.
[0029]
As shown in FIG. 1, a substantially rectangular plate-like printed board 24 having a thickness
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10
equal to the depth of the recess 16 is mounted on the back side of the yoke 2, and both ends of
the printed board 24 have fourth openings through the notches 22. The printed circuit board 24
is positioned by being fitted into the housing 23.
A pair of external connection terminals having a planar shape for surface mounting (not shown)
and a pair of external connection terminals made of an elastic member such as a leaf spring or a
coil spring are provided on the lower surface of the printed substrate 24. A pair of internal
connection terminals in a planar shape that are electrically connected to the pair of external
connection terminals are provided. Two lead wires (not shown) of the voice coil 11 are drawn
from the magnetic circuit 5 to the frame 8 through the notches 20 and guided to the fourth
opening 23 in the frame 8 and exposed in the frame 8 at the fourth opening 23 The electric
signal is input to the voice coil 11 from the external circuit through the external connection
terminal, the internal connection terminal, and the lead wire.
[0030]
The integration of the yoke 2, the magnet 3 and the pole piece 4 (assembly of the magnetic
circuit 5) and the fixing of the printed circuit board 24 to the yoke 2 are performed in the first
opening 18 (yoke in each of the printed circuit board 24, the magnet 3 and the pole piece 4). The
center hole 23a, 3a, 4a of approximately the same diameter as the center hole 2 of 2) is provided,
and the first opening 18 and the center hole 23a, 3a, 4a at the center of the printed circuit board
24, yoke 2, magnet 3, pole piece 4 The rivet 25 is penetrated through it, the upper end or the
lower end of the rivet 25 is squeezed, and it is collectively carried out by caulking and fixing.
[0031]
The third opening 21 is used as a hole or a back sound hole for inserting an assembling jig or the
like from the outside to the inside of the speaker 1 when the speaker 1 is assembled, and the
second opening 19 is used as a back sound hole of the speaker 1.
The second opening 19 is covered with a breathable damping cloth 26 from the back side of the
speaker 1.
[0032]
Thus, in the integrated structure of the yoke 2 and the frame 8, various functions can be added
by the opening which can be formed by simple press processing.
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11
[0033]
In addition, after drawing processing of one sheet-like metal material (magnetic material) to form
a bottomed cylindrical frame, plural pieces of the bottom plate are cut and raised to form a
plurality of bottom plates and peripheral portions of the bottom plates The yoke and the frame
may be integrally formed by simple pressing.
[0034]
A plate-made baffle 27 for covering and protecting the diaphragm 9 is fitted and fixed to the
upper portion of the frame 8.
The baffle 27 is provided with a front sound hole 28 of the speaker 1.
The front sound hole 28 is covered with a damping cloth (not shown) having air permeability
from the front side of the speaker 1.
[0035]
FIG. 4 is an enlarged sectional view of an essential part of a speaker according to a second
embodiment of the present invention. The speaker 30 differs from the speaker 1 of the first
embodiment in that a damper 14a integrally formed with the voice coil bobbin 12 is provided
instead of the damper 14 of the speaker 1 of the first embodiment, and the other structure is the
same. The same structure as that of the speaker 1 of the first embodiment is denoted by the
same reference numeral, and the detailed description is omitted. By forming the damper 14a
integrally with the voice coil bobbin 12 as in the speaker 30 of the present embodiment, the
number of parts of the vibration system 13 and the number of assembling steps can be reduced
to improve productivity.
[0036]
FIG. 5 is an enlarged sectional view of an essential part of a speaker according to a third
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12
embodiment of the present invention. The speaker 40 is provided with a voice coil bobbin 12a
integrally formed with the dome portion 9a of the diaphragm 9 instead of the voice coil bobbin
12 of the speaker 1 of the first embodiment, and the damper 14 is integrally formed with the
dome portion 9a of the diaphragm 9 The structure is the same as that of the speaker 1 of the
first embodiment except that the voice coil bobbin 12a is formed separately from the speaker 1
of the first embodiment. The description is omitted. As in the speaker 40 of this embodiment, the
damper 14 is formed separately from the voice coil bobbin 12a integrally formed with the dome
portion 9a of the diaphragm 9, thereby reducing the number of parts of the vibration system 13
and the number of assembly steps. Productivity can be improved.
[0037]
FIG. 6 is an enlarged sectional view of an essential part of a speaker according to a fourth
embodiment of the present invention. The speaker 50 differs from the speaker 1 of the first
embodiment in that a diaphragm 90 in which a dome portion 90a and an edge portion 90b are
integrally formed is provided instead of the diaphragm 9 of the speaker 1 of the first
embodiment. Since the other structure is the same as that of the speaker 1 of the first
embodiment, the same reference numerals are given to the same structure and the detailed
description is omitted. By forming the dome portion 90a and the edge portion 90b integrally
with the diaphragm 90 as in the speaker 50 of the present embodiment, the number of parts of
the vibration system 13 and the number of assembly steps can be reduced to improve
productivity. In the speaker 50 of this embodiment, the voice coil bobbin 12 and the damper 14
are separately formed with respect to the diaphragm 90 in which the dome portion 90a and the
edge portion 90b are integrally formed. It may be integrally formed as the speaker 30 of the
second embodiment.
[0038]
FIG. 7 is an enlarged sectional view of an essential part of a loudspeaker according to a fifth
embodiment of the present invention. The speaker 60 is integrally formed with the voice coil
bobbin 12 instead of the damper 14 of the speaker 1 of the first embodiment, and provided with
a damper 14 b for directly bonding and fixing the magnet side end portion to the outer
peripheral surface of the magnet 3. The structure is the same as that of the speaker 1 of the first
embodiment except that the point is different from the speaker 1 of the first embodiment, and
the same reference numerals are given to the same structure and the detailed description is
omitted. As in the speaker 60 of the present embodiment, the damper 14 b may be bonded and
fixed directly to the outer peripheral surface of the magnet 3 without using the damper ring 15.
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13
When the magnet side end of the damper 14b is bent at a right angle to the corrugated part and
adhesively fixed to the outer peripheral surface of the magnet 3 like the speaker 60 of this
embodiment, the bending direction of the magnet side end of the damper 14b is the damper It is
bent downward (solid line) or upward (two-dot chain line) according to the height position of
14b. The dampers 14, 14 a, 14 b of the speakers 1, 30, 40, 50 according to the first to fourth
embodiments may be directly adhered and fixed to the outer peripheral surface of the magnet 3
without using the damper ring 15.
[0039]
As mentioned above, although Examples 1-5 explained the present invention as a circular
speaker provided with a circular inner magnetic type magnetic circuit, the present invention is
not limited to it, and various modification implementation can be carried out in the range which
does not deviate from the gist. can do. For example, the present invention relates to a rectangular
or oval speaker having a circular or rectangular inner magnet type magnetic circuit, a speaker
having a circular or rectangular outer magnet type magnetic circuit having a magnet disposed on
the outside of a voice coil, one piece or another The present invention can also be applied to a
speaker provided with a body yoke and a frame, a speaker provided with a separate yoke and a
resin frame, and the like.
[0040]
1, 30, 40, 50, 60 Speaker 2 Yoke 3 Magnet 4 Pole Piece 5 Magnetic Circuit 6 Magnetic Gap 8
Frame 9, 90 Diaphragm 9b, 90b Edge 11 Voice Coil 12, 12a Voice Coil Bobber 14, 14a 14b
Damper 15 Damper Ring (damper fixing member)
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