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JP2007266985

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DESCRIPTION JP2007266985
The present invention provides a structure of an electroacoustic transducer which can be
enlarged by providing an overhanging portion on a terminal substrate and can prevent
deformation and peeling due to an external force. Also, reduce the possibility of a short circuit
between the yoke frame of the electroacoustic transducer and the conductor in contact with the
terminal substrate. SOLUTION: A part of an electro-acoustic transducer and a member having
another role (a specific example is a diaphragm holding ring, a protector of a diaphragm, or a
yoke frame), a part of the electro-acoustic transducer By extending beyond the natural contour
portion (circular contour close to the outer shape of the diaphragm) and abutting or approaching
the front side of the terminal substrate as a receiving member for the similar projecting portion
of the terminal substrate, Prevention of deformation of the terminal board to the front side.
[Selected figure] Figure 2
Electro-acoustic transducer
[0001]
The present invention relates to the structure of a compact electroacoustic transducer. More
particularly, the present invention relates to a structure for preventing deformation of a terminal
substrate fixed to an electroacoustic transducer.
[0002]
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For example, the outer shape of a small electroacoustic transducer such as a speaker or a
receiver incorporated in a small electronic device such as a mobile phone is generally thin and
cylindrical (the outer diameter is, for example, about 15 mm). The structure of an electro-acoustic
transducer that is such a conventional speaker or receiver is shown in FIGS. 10 is a front view of
the conventional example, FIG. 11 is a cross-sectional view of the conventional example, and FIG.
12 is a rear view of the conventional example.
[0003]
In each of the drawings, 1 is a yoke frame, a member formed of a soft magnetic material and
having a step shape, which determines the outline of the electroacoustic transducer, and the
magnetic circuit of the electrodynamic electroacoustic transducer Form part of. On the back side
(the lower side in FIG. 11), a slightly smaller diameter rear projection 1d protrudes, and a flat
cylindrical permanent magnet 2 is fixed to the center of the inner bottom. A disk-shaped top
plate 3 made of a soft magnetic material is fixed to the front side (upper side in FIG. 11) of the
permanent magnet 2. Between the outer periphery of the top plate 3 and the rear surface
protrusion 1d of the yoke frame, a ring-shaped magnetic air gap 4 is formed in which the
magnetic flux generated by the permanent magnet 2 is converged in the space.
[0004]
A diaphragm 5 is formed by molding a thin disc-like resin film. The peripheral portion 5a is
located at the outermost periphery and mounted on and fixed to the step 1c of the yoke frame 1,
the elastically deformable portion 5b occupying the inner side, and the voice coil 6 fixed to the
lower side It comprises a ring-shaped flat portion 5c, and a central dome portion 5d provided in
the central portion and capable of parallel movement with the voice coil 6 in the vertical
direction. The voice coil 6 has a thin cylindrical shape, and is inserted into a ring-shaped
magnetic air gap 4 generated between the outside of the top plate 3 and the inner wall of the
rear projection 1 d of the yoke frame to feed voice current to the winding. For example, it
vibrates in the axial direction (vertical direction in FIG. 11) to generate a sound.
[0005]
Usually, in order to press and fix the peripheral edge mounting portion 5a of the diaphragm 5 to
the stepped portion 1c of the yoke frame 1 from above, a pressing ring made of resin or metal is
provided on the front surface of the peripheral edge mounting portion 5a of the diaphragm, or In
order to protect the fragile diaphragm 5, a protector (for example, made of a metal plate and
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provided with a sound emission hole) covering the entire front of the diaphragm is disposed. In
order to clarify, the illustration of the presser ring and the protector is omitted.
[0006]
The terminal substrate 9 is an arc-shaped member disposed on the back surface of the yoke
frame 1 outside the back surface projecting portion 1d with the positioning projections 1g aided
in determining the direction, and on the lower surface side, the terminal wire of the voice coil 6
6a (the yoke frame 1 is detoured from the back surface of the diaphragm 5 by the notch 1e) are
connected by soldering or the like a terminal wire fixing pattern 9b, an external terminal pattern
9c (these are shown by hatching), A pair of conductive patterns consisting of a connection
pattern 9d connecting the two is provided.
[0007]
As shown in FIG. 11, the probe pin 10 is pressure-welded from the outside in the direction of the
arrow to the external terminal pattern 9c for product inspection or for connection with a
motherboard on which the electroacoustic transducer is mounted.
Conventionally, the planar shape of the outer shape of the speaker is substantially circular, and
the terminal substrate 9 is also accommodated within the circular contour.
Therefore, the distance D between the side surface of the probe pin 10 and the side surface of
the back surface protrusion 1d can not be increased, and there is a risk of contact between the
two because there is a positional error between them. It was remarkable to do. In addition, the
area itself of the external terminal pattern 9c can not be made sufficiently large within the
circular contour of the electroacoustic transducer, and there have been cases in which
dissatisfaction has occurred.
[0008]
In order to increase the distance D or to increase the area of the external terminal pattern 9c, as
shown by the thin solid line in FIG. 12 which is a rear view, the terminal board 9 is stretched to
the outside of the circular outline of the speaker. The protrusion 9a may be provided, and the
external terminal pattern 9 may be expanded outside the circular contour as shown by the thin
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solid line, and the probe pin 10 may be brought into contact with the expanded portion 9c '.
However, if this structure is employed carelessly, as shown in FIG. 11 which is a cross sectional
view, there is no means for receiving the pressure contact force of the probe pin 10 behind (on
the upper surface side) the overhanging portion 9 a of the terminal substrate 9 The terminal
substrate 9 is deformed or displaced as shown by a thin solid line by the pressure contact force,
and the terminal substrate 9 is separated from the yoke frame 1 and there is a high risk of
damaging the speaker.
[0009]
The present invention has been made to solve the above-mentioned drawbacks of the
conventional structure, and an object of the present invention is to provide an electroacoustic
device which can be enlarged by providing an overhanging portion on a terminal substrate, and
further can prevent deformation or peeling due to external force. It is to provide the structure of
a converter. A further object is to reduce the risk of a short circuit between the yoke frame of the
electroacoustic transducer and the external conductor in contact with the terminal substrate.
[0010]
In order to achieve the above object, the electro-acoustic transducer converter of the present
invention has the following features. (1) A diaphragm with a voice coil located on the front side, a
top plate for forming a ring-shaped magnetic gap and a permanent magnet, and the voice coil is
inserted into the magnetic gap and the periphery of the diaphragm An electro-acoustic
transducer comprising: a yoke frame for supporting a portion; and a terminal substrate fixed to a
peripheral portion of the yoke frame such that an external terminal pattern to which a terminal
wire of the voice coil is connected faces the back side; A terminal board protruding portion
protruding outward from a circular contour portion of a front wall of the yoke frame along the
outer shape of the diaphragm is provided on the terminal board, and a member constituting a
part of the acoustic transducer and having another role A portion is extended beyond the circular
outline of the yoke frame to provide an overhang portion for the other member, and the
overhang portion for the other member is disposed on the front side of the overhang portion of
the terminal substrate, Front Be a receiving member for side deformation.
[0011]
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In order to achieve the above object, the electro-acoustic transducer of the present invention may
further include any of the following features. (2) The other member overhanging portion is a part
of a pressing ring that clamps the peripheral portion of the diaphragm together with the yoke
frame.
[0012]
(3) The acoustic transducer has a protector for protecting the front surface of the diaphragm and
having a sound emission hole, and the other member overhang portion is a part of the protector.
[0013]
(4) The other-member overhang portion is a part of the yoke frame.
[0014]
Since a part of the member having another role is used as the projecting part of the other
member and it is used as a receiving member of the projecting part of the terminal board, the
area of the terminal board can be increased without increasing the number of parts of the
electroacoustic transducer To increase the area of the external terminal pattern away from the
protrusion of the yoke frame and to increase the area if necessary, to prevent contact between
the yoke frame and the other conductive member, and to fix the fixing force of the terminal
substrate. I was able to secure it.
[0015]
As a member having another role used for the receiving member of the terminal board
overhanging portion, it seems to be the best to use one of the diaphragm holding ring, the
protector of the diaphragm, and the yoke frame.
In each of the following cases, the structure of the speaker as the electro-acoustic transducer of
the present invention will be described as each example of the present invention with reference
to the drawings.
The same reference numerals are used for parts having the same structure and function as the
conventional example, and the same reference numerals will not be described again, and
differences with the conventional example will be mainly described.
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[0016]
1 is a front view of Example 1, FIG. 2 is a cross-sectional view, and FIG. 3 is a rear view.
Also in the present embodiment, the protector is not shown. The first difference from the
conventional example is that the terminal substrate 9 fixed to the lower surface of the outer
peripheral portion of the yoke frame 1 is a front wall 1b close to the outer peripheral circular
contour or outer peripheral portion of the diaphragm 5, which is usually circular. It is a point
having an overhanging portion 9a that protrudes outward in a square beyond the outer natural
circular contour (which may be called the natural circular contour of the main part of the
electroacoustic transducer). By this change, the position of the external terminal pattern 9c can
be separated from the back surface protrusion 1d of the yoke frame 1 as much as necessary, and
the area can be increased. In addition, the notch part 1e for letting the terminal wire 6a of the
voice coil 6 pass to a back surface, and the terminal wire adhering pattern 9b are provided in the
position which avoided the overhang part 9a.
[0017]
The second difference from the illustrated conventional example is that the ring-like portion of
the main body (having a front wall 1b of the yoke frame or the like fixed to each other by fitting
or bonding or the like) To hold the peripheral edge mounting portion 5a of the diaphragm 5 and
hold the peripheral edge mounting portion 5a of the diaphragm 5 together with the step portion
1c of the yoke frame. A presser ring overhang 7a protruding like a tail of a fish is provided on
the left outside of the figure beyond the notch provided in the part, and the lower surface is
brought into contact with the terminal substrate overhang 9a from the upper surface It is a
receiving member of the portion 9a.
[0018]
Due to this structure, the present embodiment is different from the above-described conventional
example, and even if the external terminal pattern 9c is strongly (upwardly) pushed by the probe
pin or other conductive member, the presence of the pressing ring overhang 7a. The deformation
or displacement of the terminal substrate 9 is prevented, and the risk of peeling off the yoke
frame 1 is eliminated.
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The probe pins can also be separated from the back projection 1d of the yoke frame, reducing
the risk of mutual shorts. Further, if the area of the terminal pattern 9c is large, the target such
as a probe pin also becomes large, and the connection error also decreases.
[0019]
The surface area of the pressing ring 7 is increased by at least the extension 7a, so that it is
advantageous for arranging a cushion member, an adhesive seal, etc. for supporting the
electroacoustic transducer on the front surface thereof. When a protector for protecting the
diaphragm 5 is provided, it may be stuck on the front surface of the presser ring 7 or, as a platelike protector, the peripheral portion thereof is overlapped with the peripheral edge mounting
portion 5a of the diaphragm and the presser ring 7 together. You may press it with.
[0020]
FIG. 4 is a front view of the second embodiment, FIG. 5 is a sectional view, and FIG. 6 is a rear
view. The difference between this embodiment and the first embodiment will be mainly
described. The shape and structure of the terminal substrate 9 and the position thereof in the
second embodiment are the same as in the first embodiment. However, in the second
embodiment, a protector 8 is provided in place of the pressing ring of the first embodiment. The
protector 8 is a member provided for the purpose of preventing damage to the diaphragm 5 and
adhesion of foreign matter, and is made of a thin metal plate, and a disk-like portion which is a
main body portion is provided with a plurality of sound emission holes 8b at its central portion.
As clearly shown in FIG. 5, it is formed in a dish shape facing downward, and the peripheral edge
portion thereof is overlapped with the peripheral edge attaching portion 5a of the diaphragm and
is fixed to the front wall 1b or the stepped portion 1c of the yoke frame by adhesion or the like.
[0021]
As apparent from FIGS. 4 and 5, the protector 8 has a fish tail fin beyond the notch provided on a
part of the front wall 1b of the yoke frame 1 on the left side as in the case of the press ring of the
first embodiment. A protector overhanging portion 8a is provided, and a part of the protector
overhanging portion 8a bent on the back side is brought into contact with the upper surface side
of the terminal board overhanging portion 9a. With this structure, displacement and deformation
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of the terminal substrate 9 can be prevented even if the terminal substrate extension 9a is
strongly pressed from below, and substantially the same operation and effect as in the first
embodiment can be obtained. Also in the present embodiment, it is possible to add a presser ring
(without an overhang portion) to the protector 8 and use it again. However, both of them may
have an overhang.
[0022]
7 is a front view of the third embodiment, FIG. 8 is a sectional view, and FIG. 9 is a rear view. In
the present embodiment, differences from the first embodiment and the second embodiment will
be described. The shape structure of the terminal substrate 9 and the position thereof in the third
embodiment are the same as those in the first and second embodiments. However, in the third
embodiment, as a receiving member for backing up the terminal board extension portion 9a,
instead of the pressing ring of the first embodiment and the protector of the second embodiment,
a part of the yoke frame 1 is extended in a rectangular shape on the left of the figure. This is the
use of the yoke frame extension 1a. In the present embodiment, since the entire surface of the
terminal substrate 9 is in contact with the same plane of the lower surface of the yoke frame 1, it
is considered possible to be fixed most firmly. Also, a (circular) press ring or protector may be
used in combination.
[0023]
Although the above three embodiments have been described, the present invention can be
implemented in various forms. For example, the shape of the relatively detailed electroacoustic
transducer, the change of the shape of the terminal board, the change of the shape of the
overhang of each member, the adoption of various fixing methods between members, the change
of material of members, the addition of members And deletion can be performed within the
scope of the technical idea of the present invention. Further, the shape of the diaphragm, that is,
the contour shape of the diaphragm that substantially defines the natural contour shape of the
electroacoustic transducer is not limited to a circular shape, and may be an elliptical shape or a
polygonal shape. Since the present invention holds even with these slightly irregular shapes,
these contour shapes are also included in the range of the circular contour.
[0024]
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In the acoustic converter of the present invention, since the member having another application
can back up the projecting portion of the terminal board, the intended purpose (certain external
connection and strength without increasing the number of parts) ) Was achieved. Therefore, the
availability of the industry is high.
[0025]
It is a front view of Example 1 of the present invention. It is sectional drawing of Example 1 of
this invention. It is a rear view of Example 1 of this invention. It is a front view of Example 2 of
this invention. It is sectional drawing of Example 2 of this invention. It is a rear view of Example
2 of this invention. It is a front view of Example 3 of this invention. It is sectional drawing of
Example 3 of this invention. It is a rear view of Example 3 of this invention. It is a front view of a
prior art example. It is sectional drawing of a prior art example. It is a rear view of a prior art
example.
Explanation of sign
[0026]
Reference Signs List 1 yoke frame 1a yoke frame extension 1b front wall 1c step 1d back
protrusion 1e notch 1f back hole 1g positioning projection 2 permanent magnet 3 top plate 4
magnetic gap 5 diaphragm 5a peripheral edge 5b elastic deformation portion 5c ring shape Flat
portion 5d Central dome portion 6 Voice coil 6a Terminal wire 7 Presser ring 7a Presser ring
overhang 7b Positioning projection 8 Protector 8a Protector overhang 8b Sound output hole 9, 9
'terminal board 9a Terminal board overhang 9b Terminal line Bonding pattern 9c, 9c 'External
terminal pattern 9d Connection pattern 10 Probe pin D Distance between probe pin 10 and rear
surface projection 1c
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