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JPH10124066

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Notice
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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH10124066
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electromagnetic type sounding body, and more particularly to an electromagnetic type sounding
body in which the diaphragm is plastically deformed due to an external impact from the
perpendicular direction to the diaphragm of the electromagnetic type sounding body. It relates to
the body.
[0002]
2. Description of the Related Art An electromagnetic type sound generator is widely used for
calling a pager such as a mobile phone or a pager, which has been widely spread in recent years.
When used in such a portable device, it may be subjected to strong external impact by falling or
the like. Therefore, various structures have been conventionally proposed for preventing the
diaphragm of the electromagnetic speaker from largely displacing due to external impact.
[0003]
FIG. 10 is a cross-sectional view showing the structure of the main part of a conventional
electromagnetic speaker. In a cylindrical sounding body case 1 having a sound emitting hole 1a
molded by plastic, there is a yoke base 2 made of a magnetic material, the outer peripheral
portion of which is fixed to the inside of the sounding body case 1; A columnar iron core 3
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provided at the center of yoke base 2, a cylindrical magnet 4 disposed around yoke base 2 and a
diaphragm 5 made of an elastic magnetic material are provided. The diaphragm 5 forms a
magnetic circuit by the magnet 4, the iron core 3 and the yoke base 2. Therefore, the diaphragm
5 is attracted and fixed to the magnet 4. Further, an iron piece 9 is attached to the central
portion of the diaphragm 5 in order to make the magnetic coupling with the iron core 3 dense
and to increase the vibrating mass. In addition, an excitation coil 6 disposed around the iron core
3 for driving the diaphragm 5, and two external connection terminals 8a and 8b provided on the
substrate 7 for guiding the end of the excitation coil 6 to the outside are included. doing. The
diaphragm 5 is electromagnetically driven by applying an electrical signal to the external
connection terminals 8a and 8b.
[0004]
A space formed by the sound emission hole 1a side of the sound generator case 1 and the
diaphragm 5 forms a resonance chamber 10 as a vibration space. When a strong external impact
is applied, the diaphragm 5 is separated from the magnet 4 because the diaphragm 5 is adsorbed
and fixed to the magnet 4, and the diaphragm 5 made of an extremely thin plate material is
deformed or spot welded to the diaphragm 5 There is a risk that the iron piece 9 being dropped
may fall off. Therefore, in this conventional example, the case projection 1c is provided on the
inner wall of the sound producing body case 1 of the resonance chamber 10, and the outer
peripheral portion of the diaphragm 5 does not move in the direction of the resonance chamber
10 beyond the allowable range. So as to regulate.
[0005]
11, 12 and 13 are cross-sectional views showing the structure of the main part of another
conventional example of the case protrusion 1c provided on the inner wall of the sound
producing case 1 of FIG. In either case, the outer peripheral portion of the diaphragm 5 is
restricted by the case projecting portion 1c so as not to move by an external impact. However, in
these examples, since the movement of the central portion of the diaphragm 5 is not restricted, it
is insufficient as protection of the diaphragm 5 against a strong external impact.
[0006]
Therefore, in order to improve the disadvantages of the above-described conventional example, a
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structure for protecting the diaphragm 5 from external impact has been proposed in Japanese
Patent Application Laid-Open No. 6-165293 "electro-acoustic transducer". FIG. 14 is a crosssectional view of an electromagnetic speaker structure disclosed in JP-A-6-165293. The same
reference numerals in FIG. 14 as in FIG. 10 have the same function and function.
[0007]
In the structure of the electromagnetic speaker shown in FIG. 14, the iron piece 10 attached to
the center of the diaphragm 5 is provided on the inner wall of the resonance chamber 10 formed
between the diaphragm 5 and the one surface side. A movement restricting means is provided for
restricting a movement allowable range of the diaphragm by an impact. That is, the sound
emission tube for guiding the sound in the resonance chamber 10 to the outside is lengthened,
and the sound emission hole protrusion portion 1b is provided and used as a movement
restricting means. It is set equal to or slightly larger than the vibration tolerance of Further, with
respect to the movement restriction of the outer peripheral portion of the diaphragm 5, a
protruding portion 1c is provided on the inner wall of the sound producing body case 1 similarly
to the case of FIG. It is regulated not to move beyond the allowable range.
[0008]
However, in the structure of the electromagnetic type sounding body disclosed in Japanese
Patent Application Laid-Open No. 6-165293, it is effective in that the movement of the
diaphragm 5 is restricted to a certain allowable range against external impact. However, when
the diaphragm 5 is subjected to a strong external impact, the diaphragm 5 is supported by the
corner of the projecting portion 1c provided on the inner wall portion of the sound producing
body case 1 and is largely bent and deformed. When the deformation reaches plastic
deformation, there is a problem that the diaphragm 5 does not return to its original shape and
the vibration characteristics change.
[0009]
The present invention has been made in view of the above problems, and an object thereof is to
provide an electromagnetic type sound generator having stable vibration characteristics such
that plastic deformation of the diaphragm does not occur even under strong external impact
force. It is
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[0010]
[Means for Solving the Problems] In order to achieve the above object, in the electromagnetic
type sounding body of the present invention, a sounding body case having a sound emission hole
and an outer peripheral portion inside the sounding body case A yoke base formed of a fixed
magnetic material, an iron core provided at a central portion of the yoke base, a magnet disposed
around the yoke base, and the sound producing body jacket. A diaphragm disposed on the
magnet so as to form a magnetic circuit by the magnet, the iron core and the yoke base, and an
excitation coil disposed around the iron core so as to form a magnetic circuit inside the And an
external connection terminal for guiding the end of the exciting coil to the outside, and the
sounding body case is disposed on an inner wall portion of a resonance chamber formed between
it and one surface side of the diaphragm. Said diaphragm by external impact at the iron piece
part attached to the central part of the plate A movement restricting member for restricting the
movement of the central portion to an allowable range is provided, and a case projecting portion
for restricting the movement of the outer peripheral portion of the diaphragm to the allowable
range is provided on the inner wall of the sound producing case. The case protruding portion is
characterized in that the contact portion with the diaphragm at the time of external impact is
formed into an arc shape so that the diaphragm is not plastically deformed by the external
impact.
[0011]
Further, in the electromagnetic type sounding body of the present invention, a sounding body
case having a sound emitting hole, a yoke base comprising a magnetic material having an outer
peripheral portion fixed inside the sounding body case, and An iron core provided at the center
of the yoke base, a magnet arranged around the yoke base, and an inside of the case of the sound
producing body, the magnet, the iron core, and the yoke. A diaphragm disposed on the magnet,
an excitation coil disposed around the iron core, and an external connection terminal for leading
an end of the excitation coil to form a magnetic circuit by a square base; And the sounding case is
attached to the center of the diaphragm on the inner wall of the resonance chamber formed
between the diaphragm and the one surface side of the diaphragm, and the impact is caused by
an external impact. The movement restricting member restricts the movement of the central
portion of the diaphragm to an allowable range. In addition, the inner wall portion of the sound
producing case is provided with a case projecting portion for restricting the movement of the
outer peripheral portion of the diaphragm to an allowable range, and the case projecting portion
is formed with the diaphragm at the time of external impact. The contact portion of the present
invention has a tapered shape so that the diaphragm is not plastically deformed by external
impact.
[0012]
Further, in the electromagnetic type sounding body of the present invention, the case protruding
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portion is provided in a plurality on the entire circumference or partially on the circumference of
the inner wall portion of the sounding body case. is there.
[0013]
Further, in the electromagnetic type sounding body of the present invention, a sounding body
case having a sound emitting hole, a yoke base comprising a magnetic material having an outer
peripheral portion fixed inside the sounding body case, and An iron core provided at the center
of the yoke base, a magnet arranged around the yoke base, and an inside of the case of the sound
producing body, the magnet, the iron core, and the yoke. A diaphragm disposed on the magnet,
an excitation coil disposed around the iron core, and an external connection terminal for leading
an end of the excitation coil to form a magnetic circuit by a square base; And the sounding case is
attached to the center of the diaphragm on the inner wall of the resonance chamber formed
between the diaphragm and the one surface side of the diaphragm, and the impact is caused by
an external impact. The movement restricting member restricts the movement of the central
portion of the diaphragm to an allowable range. In addition, the inner diameter of the sound
producing case is made larger than the outer diameter of the diaphragm so that the diaphragm
does not plastically deform by coming into contact with the cylindrical case even if it is displaced
by an external impact. It is a feature.
[0014]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the
present invention will be described below based on examples shown in the drawings.
In the drawings, the same members as in the prior art are denoted by the same reference
numerals and the description thereof will be omitted.
FIG. 1 is a cross-sectional view showing the structure of the main part of the first embodiment of
the present invention.
FIG. 2 is an enlarged sectional view of an essential part of a support (a part surrounded by a
dotted line in FIG. 1) of the diaphragm outer peripheral part in FIG.
[0015]
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The cylindrical sounding body case 1 is a piece of iron 9 attached to the central portion of the
diaphragm 5 as a movement restricting member for restricting the movement allowable range of
the diaphragm 5 due to an external impact, outside the sound in the resonance chamber 10 The
distance between the end of the sound emitting hole protrusion 1 b and the diaphragm 5 is set to
be equal to or slightly larger than the normal allowable range of vibration by lengthening the
sound emitting hole protrusion 1 b leading to the end.
Further, a case protrusion 11c is provided on the inner wall of the resonance chamber 10 of the
cylindrical case 1 for limiting the movement of the outer periphery of the diaphragm 5 to an
allowable range, and the shape of the protrusion is strong external impact The portion of the
diaphragm 5 which is displaced and comes into contact with the projecting portion has an arc
shape of about R = 4 mm.
[0016]
With such a configuration, in the first embodiment, as shown in FIG. 5, when the diaphragm 5
receives a strong external impact, the diaphragm 5 is displaced, and the sounding body case 1 is
Even when contacting the case protrusion of the inner wall, the contact portion of the case
protrusion is arc-shaped and has no corners, so that the shock due to the contact with the case
protrusion can be softened and the diaphragm The diaphragm 5 can maintain stable vibration
characteristics without causing plastic deformation.
The movement limiting member of the diaphragm is not limited to the sound emission hole
protrusion 1b using the sound output tube, but may be provided independently on the ceiling or
side wall which is the inner wall of the sound producing case 1 in the resonance chamber. it can.
[0017]
FIG. 3 is an enlarged sectional view of an essential part of a support portion of a diaphragm outer
peripheral portion showing a second embodiment of the present invention. In the second
embodiment, as in the first embodiment, a sound emission hole protrusion 1b is provided as a
movement restricting member at the central portion of the diaphragm 5 due to external impact,
and a resonance chamber of the sound producing case 1 is further provided. The structure of the
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case projecting portion 21c for restricting the movement of the outer peripheral portion of the
diaphragm 5 provided on the inner wall portion of 10 to an allowable range, the shape of the
portion where the diaphragm 5 is displaced and makes contact is approximately 10 degrees -.
Therefore, as shown in FIG. 6, even if the diaphragm 5 is subjected to a strong external impact,
the diaphragm 5 is displaced, and even if it contacts the protruding portion of the inner wall
portion of the sound producing body case 1, it protrudes Since the contact portion of the portion
is tapered at the taper, as in the case of the first embodiment, the shock due to the contact with
the protrusion is softened and the deflection of the diaphragm is reduced. Can maintain stable
vibration characteristics without causing plastic deformation.
[0018]
FIG. 4 is an enlarged sectional view of an essential part of a support portion of a diaphragm outer
peripheral portion showing a third embodiment of the present invention. Similar to the first
embodiment, in the third embodiment, a sound emission hole protrusion 1b is provided as a
movement restricting member at the central portion of the diaphragm 5 due to an external
impact, and the inner diameter of the sound producing case 1 is further set. The diameter is
made larger than the outer diameter of the diaphragm 5 so that the peripheral portion of the
diaphragm 5 is not in contact with the inner wall of the sound producing body case 1 even if the
peripheral portion is bent.
[0019]
With such a configuration, in the third embodiment, even if the diaphragm 5 is displaced when
the diaphragm 5 receives a strong external impact, it contacts the inner wall portion of the sound
producing body case 1 Since there is no bending, it will return to its original position when the
impact force disappears. Therefore, the diaphragm 5 can maintain stable vibration characteristics
without causing plastic deformation.
[0020]
7 to 9 show horizontal cross-sectional shapes of the sound producing case, and FIG. 7 is a crosssectional view taken along the line A-A of FIG. 1 showing the first embodiment. The second
embodiment also has substantially the same shape. FIG. 9 shows the shape of the sound
producing case of the third embodiment. As compared with the third embodiment shown in FIG.
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9, the first and second embodiments have the case protruding portions 11c and 21c provided
over the entire circumference of the sound producing case, so that the case can be obtained. The
wall thickness of the chamber increases, the volume of the resonance chamber 10 decreases, and
the frequency increases. However, as shown in FIG. 8, the volume of the resonance chamber 10
is suppressed by making the case protrusion 11c a rib 41c. be able to. In the present
embodiment, eight ribs 41 c are provided, but the influence on the vibration characteristics such
as the frequency can be almost eliminated without a large influence on the volume of the
resonance chamber 10. It is needless to say that it is desirable to provide ribs at a plurality of
locations so that the vibration characteristic has an optimum value, since the volume of the
resonance chamber actually changes depending on the size of the sound producing case.
[0021]
As is apparent from the foregoing, according to the present invention, when the diaphragm is
subjected to a strong external impact, the outer peripheral portion of the diaphragm is prevented
from coming into contact with the inner wall portion of the sound producing case. Plastic
deformation of the diaphragm by making the case protruding part shape of the inner wall of the
sound producing case at the contact point of the diaphragm even if it contacts or makes a
circular arc or a taper or a flat shape. Thus, it is possible to obtain an electromagnetic type sound
generator that has stable vibration characteristics. Also, by making the case projecting part of the
sound producing body case a plurality of ribs, it is possible to suppress the decrease of the
volume of the resonance chamber and to almost eliminate the influence on the vibration
characteristics such as the frequency.
[0022]
Brief description of the drawings
[0023]
1 is a cross-sectional view showing the structure of the main part of the first embodiment of the
present invention.
[0024]
2 is an enlarged sectional view of a main part of the support portion of the diaphragm outer
peripheral portion in FIG.
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[0025]
3 is an enlarged sectional view of an essential portion of the support portion of the diaphragm
outer peripheral portion of the second embodiment of the present invention.
[0026]
4 is an enlarged sectional view of an essential portion of the support portion of the diaphragm
outer peripheral portion of the third embodiment of the present invention.
[0027]
5 is a cross-sectional view schematically showing the relationship between the diaphragm of the
first embodiment and the case projection portion at the time of impact.
[0028]
6 is a cross-sectional view schematically showing the relationship between the diaphragm of the
second embodiment and the case projection portion at the time of impact.
[0029]
7 is a sectional view taken along the line A-A of FIG. 1 showing the sound producing case of the
first embodiment.
[0030]
FIG. 8 is a cross-sectional view of a sound producing case according to another embodiment in
which the case protrusion of FIG. 7 is a rib.
[0031]
<Figure 9> It is the cross section diagram of the sounding body case of 3rd execution example.
[0032]
10 is a cross-sectional view showing the structure of the main part of the conventional
electromagnetic speaker.
[0033]
11 is a cross-sectional view showing the main part of another conventional example of the case
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projecting portion 1c of the sound producing body case 1 of FIG.
[0034]
12 is a cross-sectional view showing the main part of still another conventional example of the
case projecting portion 1c of the sound producing body case 1 of FIG.
[0035]
13 is a cross-sectional view showing the main part of still another conventional example of the
case protrusion portion 1c of the sound producing body case 1 of FIG.
[0036]
FIG. 14 is a cross-sectional view showing the structure of the main part of the conventional
electromagnetic speaker.
[0037]
Explanation of sign
[0038]
DESCRIPTION OF SYMBOLS 1 Sounding body case 1a Sound emission hole 1b Sound emission
hole protrusion part 1c, 11c, 21c Case protrusion part 2 Yokes base 3 Iron core 4 Magnet 5
Vibration board 6 Excitation coil 7 Base plate 8a, 8b 9 pieces of iron 10 resonance chamber
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