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JP2002336785

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DESCRIPTION JP2002336785
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vibration generating device incorporated in a portable communication device such as a portable
telephone or pager, or a small device such as a watch or a toy, and a leaf spring used therefor.
[0002]
2. Description of the Related Art Conventionally, a portable telephone has a built-in sound
generator (ringer) for notifying a call by sound and a built-in vibration generator for notifying of
a call by vibration of the main body of the telephone. It is possible to use both properly according
to the situation. However, small devices such as mobile phones do not have enough space for
incorporating both the sound generation device and the vibration generation device, and there is
a problem that the equipment becomes large due to the provision of both devices. Therefore, the
applicant has proposed a compact sound and vibration generator having both functions of a
sound generator and a vibration generator as shown in FIGS. 10 and 11 (Japanese Patent
Application Laid-Open No. 10-14194).
[0003]
The sound and vibration generator comprises two vibration systems in a resin casing (110). The
casing (110) comprises a lower case (110a) for supporting the first vibration system and an
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upper case (110b) for supporting the second vibration system, and a central portion of the upper
case (110b) emits noise. The mouth (111) has been opened. The first vibration system is
composed of a plate spring (112) and a first vibrator (116) having a permanent magnet (113),
and an inner peripheral portion of the plate spring (112) is provided with a first vibrator (116). Is
attached by adhesion or the like, and the outer peripheral portion of the plate spring (112) is
attached to the lower case (110a) by adhesion or the like.
[0004]
As shown in FIG. 9, the leaf spring (112) opens a central hole (101) in a disc-shaped main body
having an outer diameter of 14 mm and a thickness of 0.12 mm, and from the central portion to
the outer peripheral portion of the disc-shaped main body. The inner ring portion (102), the
outer ring portion (103), and the inner ring portion (102) are formed by opening three long
holes (105) (105) (105) which are spirally extended toward the core. , And three arm portions
(104) (104) (104) which extend in a spiral manner toward the outer peripheral ring portion
(103). Accordingly, due to the elastic deformation of the three arm portions (104) (104) (104),
the inner ring portion (102) and the outer ring portion (103) are displaced relative to each other
along the central axis of the disk-like main body Is possible.
[0005]
Thus, the first vibration system can vibrate up and down with respect to the lower case (110a). In
the first vibrating body (116), upper and lower yokes (114) and (115) are provided above and
below the permanent magnet (113), respectively, to form a magnetic circuit. The permanent
magnet (113) is magnetized such that the upper surface is an N pole and the lower surface is an
S pole. The upper yoke (114) is formed in a ring shape having a vertical wall on the inner
periphery, while the lower yoke (115) is formed in a disk shape having a raised portion in the
center. A magnetic gap (121) is formed between the vertical wall of the upper yoke (114) and the
central raised portion of the lower yoke (115) such that the second vibrating body (117) can
move up and down.
[0006]
On the other hand, the second vibration system is composed of a vibration plate (122) and a
second vibration body (117) provided with a coil (118), and an inner peripheral portion of the
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vibration plate (122) 117) is attached by adhesion or the like, and the outer peripheral portion of
the diaphragm (122) is attached to the upper case (110b) by adhesion or the like. As a result, the
second vibration system can vibrate up and down with respect to the upper case (110b). The coil
(118) of the second vibrating body (117) is supported on the back surface of the diaphragm
(122) via a cylindrical bobbin (119), and the coil (118) and the bobbin (119) are It is movably
disposed in the magnetic gap (121) of one oscillator (116).
[0007]
The second vibration system has a natural frequency (for example, about 2 kHz) of the audible
band, while the first vibration system has a lower natural frequency (for example, about 150 Hz)
than the second vibration system. Therefore, a drive circuit (not shown) is connected to the pair
of free ends (123) and (123) of the coil (118) to supply a drive signal having the natural
frequency of the second vibration system to the coil (118). Causes the second vibration system to
resonate to emit an audible sound. On the other hand, by supplying a drive signal having the
natural frequency of the first vibration system to the coil (118), the first vibration system
resonates and a sensational vibration is generated.
[0008]
However, in the conventional sound and vibration generating apparatus, the arm portion (104)
shown in FIG. 9 is caused by repeated elastic deformation of the plate spring (112) constituting
the first vibration system. May break at the connecting portion with the outer peripheral ring
portion (103). This is because in the process of repeated elastic deformation of the arm portion
(104), stress is concentrated on the portion A facing the edge of the long hole (105), and the
concentrated stress exceeds the fatigue limit so that metal at the portion A Fatigue occurs, and as
a result, a crack occurs from the portion A, and eventually the arm portion (104) leads to
breakage.
[0009]
Therefore, the present inventors have taken measures to expand the shape around the fracture
occurrence location in order to reinforce the fracture occurrence location of the arm part (104)
of the plate spring (112), but this makes the arm assembly (104) Although the breakage did not
occur, the frequency at which the resonance occurs in the first vibration system fluctuated, and
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the problem that the notification operation became uncertain occurred. A graph shown by a
broken line in FIG. 12 represents the relationship between the frequency and the acceleration in
the first vibration system in which the leaf spring is reinforced, and the left and right are
asymmetric about the resonance frequency of 150 Hz. Furthermore, as shown by a long broken
line and a short broken line in FIG. 13, when the frequency is changed from low to high (long
broken line) and when the frequency is changed from high to low ( In the short dashed line), the
resonance frequency changes, and as shown in FIG. 15, the resonance frequency also changes
due to the change of the input voltage, so that it is difficult to obtain stable vibration operation. It
is presumed that this is because the relationship between the external force acting on the leaf
spring (112) and the amount of deflection (deflection characteristics) becomes non-linear with
the shape change for reinforcement.
[0010]
An object of the present invention is to provide a plate spring which does not break even under
the action of repeated stress and exhibits linear deflection characteristics as well as a vibration
generator using the plate spring.
[0011]
SUMMARY OF THE INVENTION A leaf spring according to the present invention comprises a
disc-like main body (20) and a plurality of disc-like main bodies (20) extending in a spiral shape
from the central part to the outer peripheral part. By opening the elongated hole (25), the inner
ring portion (22), the outer ring portion (23), and a plurality of spirally extending from the inner
ring portion (22) toward the outer ring portion (23) Book arm portions (24), each arm portion
(24) being bent apart from a plane including the disc-like main body (20) at at least one location
in the longitudinal direction A bent portion (26) having a cross-sectional shape that facilitates
bending in a plane orthogonal to the width direction of the arm portion (24) is formed.
[0012]
The bent portion (26) can be formed, for example, such that the cross-sectional shape orthogonal
to the width direction of the arm portion (24) is an arc shape.
[0013]
In the leaf spring of the present invention, although the external force acts in the direction in
which the inner ring portion (22) and the outer ring portion (23) are separated from each other,
the arm portion (24) is elastically deformed. A bending portion (26) is formed in the arm portion
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(24), and the bending portion (26) has a cross-sectional shape that facilitates bending in a plane
orthogonal to the width direction of the arm portion (24). In the bending portion (26), bending
occurs in a plane orthogonal to the width direction of the arm portion (24), and most of the
bending according to the external force is the bending portion (26) 26) will be concentrated.
Here, since the bending portion (26) is bent in a certain range, an external force acts uniformly
on the range, and no large concentrated stress is generated.
Therefore, even if stress is repeatedly applied to the leaf spring, the arm portion (24) is not
broken due to metal fatigue.
Further, since the bending portion (26) exclusively bends in a plane orthogonal to the width
direction of the arm portion (24), the relationship between the external force acting on the plate
spring and the amount of bending (deflection characteristics) is linear.
[0014]
The vibration generating apparatus according to the present invention comprises: a cylindrical
case (1); at least one plate spring (2) whose outer peripheral portion is connected to the inner
peripheral surface of the cylindrical case (1); 2) comprising a magnet body attached to the
central portion and a coil (6) disposed in the magnetic field formed by the magnet body, and
supplying a coil current (6) to the plate spring 2) to vibrate. Here, the structure of the plate
spring of the present invention is adopted as the plate spring (2). That is, the leaf spring (2)
comprises a disc-shaped main body (20), and in the disc-shaped main body (20), a plurality of
elongated holes (25) which spirally extend from the central portion toward the outer peripheral
portion By opening the inner circumferential ring portion (22), the outer circumferential ring
portion (23), and a plurality of arm portions (spirally extending from the inner circumferential
ring portion (22) toward the outer circumferential ring portion (23) 24) and each arm portion
(24) is bent at least at one position in its longitudinal direction from the plane including the disclike main body (20) and bent in the width direction of the arm portion (24) A bent portion (26)
having a cross-sectional shape is formed to facilitate bending in a plane perpendicular to the
direction.
[0015]
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Therefore, even if the informing operation by vibration is repeated and stress is repeatedly
applied to the plate spring (2), the arm portion (24) is not broken due to metal fatigue. In
addition, since the bending portion (26) exclusively bends in a plane orthogonal to the width
direction of the arm portion (24), the relationship between the external force acting on the plate
spring (2) and the amount of bending (deflection characteristics) is linear As a result, the
resonance frequency always has a constant value, and a reliable notification operation is realized.
[0016]
In the specific configuration, the diaphragm (7) is disposed inside the cylindrical case (1), and the
outer peripheral portion of the diaphragm (7) is connected to the inner peripheral surface of the
cylindrical case (1), The coil (6) is attached to the center of the diaphragm (7). Therefore, by
supplying the coil (6) with an alternating current of a frequency that matches the resonance
frequency of the vibration system including the plate spring (2), the vibration system resonates,
and an incoming call is notified by a sensational vibration. . Also, by supplying the coil (6) with an
alternating current of a frequency that matches the resonance frequency of the vibration system
including the diaphragm (7), the vibration system resonates and arrival is notified by ringer
sound or melody sound. Ru.
[0017]
In another specific configuration, the outer peripheral portions of two plate springs (2) and (3)
are respectively connected to the inner peripheral surface of the cylindrical case (1), and both
plate springs (2) and (3) The magnet body is attached to a central portion. The two plate springs
(2) and (3) have inner ring portions (22) and (22), outer ring portions (23) and (23), and arm
portions (24) and (24) which have the same shape. And bent portions (26) and (26) which are
bent in opposite directions to form a plane-symmetrical shape. This prevents rolling when the
two plate springs (2) and (3) vibrate at the same time, and further improves the linearity of the
deflection characteristics.
[0018]
According to the plate spring according to the present invention and the vibration generating
apparatus using the same, the arm portion of the plate spring is not broken even by the action of
repeated stress, and linear deflection characteristics can be obtained. Therefore, the operation of
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resonance generation can be made reliable.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example in which the present
invention is applied to a sound and vibration generating apparatus to be equipped in a portable
telephone will be specifically described with reference to the drawings.
1 and 2 show the structure of a sound and vibration generator according to the present
invention, and a bottom plate (11) is fixed to the lower opening of a cylindrical case (1) made of
resin. Further, a cylindrical spacer (14) is attached to the inner peripheral surface of the
cylindrical case (1), and a collar portion (15) and a spacer (14) are provided so as to protrude
from the inner peripheral surface of the cylindrical case (1). Between the spacer (14) and the
bottom plate (11) while the outer periphery of the lower plate spring (3) is sandwiched.
[0020]
A ring-shaped weight piece (4) is disposed between the upper plate spring (2) and the lower plate
spring (3), and the upper and lower surfaces of the weight piece (4) are double plate springs (2)
(3) It is fixed to The outer peripheral surface of the lower yoke (41) having a dish shape is fixed
to the inner peripheral surface of the weight piece (4). Further, a disk-shaped magnet (5) is fixed
to the bottom surface of the lower yoke (41), and a disk-shaped upper yoke (42) is fixed to the
upper surface of the magnet (5). Thus, a ring-shaped magnetic gap portion is formed between the
inner peripheral surface of the lower yoke (41) and the outer peripheral surface of the upper
yoke (42).
[0021]
A diaphragm (7) is disposed in the upper opening of the cylindrical case (1), and the outer
peripheral portion of the diaphragm (7) is fixed to the flange (15) of the cylindrical case (1). A
cylindrical coil (6) is fixed to a central portion of the inner surface of the diaphragm (7), and the
coil (6) intrudes into the magnetic gap portion. Further, a convex portion (10) is formed on the
outer peripheral surface of the cylindrical case (1), and a pair of relay terminals (12) and (13) are
held by the convex portion (10). A pair of conducting wires (61) and (62) drawn from the coil (6)
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is soldered to the upper ends of the relay terminals (12) and (13) after being wound.
[0022]
Thus, two vibration systems are formed inside the cylindrical case (1). The first vibration system
comprises a pair of upper and lower plate springs (2) and (3), a weight (4), a magnet (5), and a
pair of upper and lower yokes (41) and (42). Is composed of a diaphragm (7) and a coil (6). The
first vibration system has a natural frequency of about 150 Hz, and the second vibration system
can reproduce sound in an audible band of 700 Hz to 10 kHz. Therefore, by supplying the
alternating current having the natural frequency of the first vibration system to the pair of relay
terminals (12) and (13), the first vibration system resonates and a sensational vibration is
generated. Also, by supplying an alternating current having the natural frequency of the second
vibration system to the pair of relay terminals (12), (13), the second vibration system resonates,
and an audible band sound (ringer sound, melody sound) Is emitted.
[0023]
The upper leaf spring (2), as shown in FIG. 4, opens a circular central hole (21) in a stainless steel
disc-shaped main body (20) having an outer diameter of 14 mm and a thickness of 0.10 mm, and
The inner circumferential ring portion (22) and the outer periphery are formed by opening three
long holes (25) (25) (25) which spirally extend from the center to the outer periphery of the disklike main body (20). A ring portion (23) and three arm portions (24) (24) (24) extending in a
spiral from the inner ring portion (22) toward the outer ring portion (23) are formed. The three
elongated holes (25) (25) (25) extend over an angle range of approximately 180 °. Also, the
three arm portions (24) (24) (24) extend over the same angular range with a phase difference of
120 °. Further, in each arm portion (24), a first bending portion (26) is formed in the vicinity of
a connecting portion with the outer peripheral ring portion (23), and a connecting portion with
the inner peripheral ring portion (22) A second bent portion (27) is formed in the vicinity. Each
of the first bent portion (26) and the second bent portion (27) is arc-shaped in cross section, and
extends while maintaining the same cross-sectional shape in the radial direction of the disc-like
main body (20). Therefore, due to the elastic deformation of the three arm parts (24) (24) (24),
the inner ring part (22) and the outer ring part (23) are arranged along the central axis of the
disc-shaped main body (20). Relatively elastic displacement is possible.
[0024]
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The lower plate spring (3) is, as shown in FIG. 3, similar to the upper plate spring (2), the inner
ring portion (22), the outer ring portion (23), and the outer ring from the inner ring portion (22)
(23) is composed of three arm portions (24), (24), (24) which spirally extend toward the portion
(23), but in each arm portion (24), an upper leaf spring (2) A first bent portion (26) and a second
bent portion (27) protruding in the opposite direction are formed. The upper plate spring (2) and
the lower plate spring (3) are positioned relative to each other with a half of the phase difference
of the three arm portions (24), that is, 60 °. There is.
[0025]
When an alternating current having the natural frequency of the first vibration system is
supplied to the pair of relay terminals 12 and 13 of the sound and vibration generating
apparatus of the present invention, the upper plate spring 2 and the lower plate spring In 3),
external force (excitation force) in the vertical direction acts on the inner ring portion (22) with
the outer ring portion (23) as the fixed end, and deflection occurs in each arm portion (24) Do.
Here, in each arm portion (24), a first bending portion (26) and a second bending portion (27)
having a circular arc shape in cross section are formed, and these bending portions (26) and (27)
are arms It is possible to easily bend in a plane orthogonal to the width direction of the portion
(24) (radial direction of the disk-like main body (20)). Therefore, most of the deflection generated
in the arm portion (24) due to the action of the external force is a deflection in these bending
portions (26) and (27), and the occurrence of the deflection is the bending portions (26) and (27)
Will concentrate on Under the present circumstances, stress generate ¦ occur ¦ produces
uniformly with respect to the whole bending part (26) (27), and a big stress does not concentrate
on one place. Therefore, even if stress is repeatedly applied to the leaf springs (2) and (3), the
arm portion (24) is not broken due to metal fatigue.
[0026]
In addition, the bent portions (26) and (27) of the leaf springs (2) and (3) exclusively cause
bending in a plane perpendicular to the width direction of the arm portion (24), so that the leaf
springs (2) and (3) The relationship between the external force acting on and the amount of
deflection (deflection characteristics) is linear. The graph shown by a solid line in FIG. 12
represents the relationship between the frequency and the acceleration in the first vibration
system provided with the plate spring (2) (3) of the present invention, and the left and right are
centered at 150 Hz as the resonance frequency. It is symmetrical. Furthermore, as shown in FIG.
14, the resonance frequency does not change with the input voltage and is constant, so that
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stable vibration operation is possible. It is presumed that this is because the relationship between
the external force acting on the leaf springs (2) and (3) and the amount of deflection (deflection
characteristics) is linear. Therefore, whenever the frequency of the alternating current for driving
the first vibration system becomes the resonance frequency of 150 Hz, resonance occurs in the
first vibration system, and a reliable notification operation is realized.
[0027]
In the above embodiment, as shown in FIG. 4, the first bent portion (26) and the second bent
portion (27) of the upper leaf spring (2) are formed in an arc shape projecting downward.
Alternatively, as shown in FIG. 5, it may be formed in an arc shape projecting upward. Further, in
the above embodiment, the first and second two bent portions (26) and (27) are formed in each
arm portion (24) of the upper plate spring (2) and the lower plate spring (3). 6, only the second
bent portion (27) is formed as shown in FIG. 6, and the first bent portion (26) is omitted, or only
the first bent portion (26) is formed as shown in FIG. The same effect is obtained also in the
configuration in which the second bent portion (27) is omitted.
[0028]
In the above embodiment, two upper and lower plate springs (2) and (3) are provided as the first
vibration system, but only the lower plate spring (3) is provided as shown in FIG. The same effect
can be obtained by omitting the plate spring (2). Further, although the bent portions (26) and
(27) are formed in a circular arc shape in cross section in the above embodiment, the present
invention is not limited to this.
[0029]
Furthermore, in the above embodiments, a disk-shaped plate spring is used, but the shape of the
outer peripheral portion and the inner peripheral portion is not limited to a circular ring shape,
and may be a rectangular shape, a polygonal shape, etc. Even if it does not restrict to a vibration
system, it can be widely used as an elastic member excellent in linearity and strength.
[0030]
Brief description of the drawings
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[0031]
1 is a partially cutaway front view of the sound and vibration generator according to the present
invention.
[0032]
2 is an exploded perspective view of the sound and vibration generator.
[0033]
3 is a perspective view showing the phase relationship between the upper plate spring and the
lower plate spring.
[0034]
4 is an enlarged perspective view of the upper plate spring.
[0035]
5 is an enlarged perspective view showing another configuration example of the upper plate
spring.
[0036]
6 is an enlarged perspective view showing another configuration example of the upper plate
spring.
[0037]
FIG. 7 is an enlarged perspective view showing still another configuration example of the upper
leaf spring.
[0038]
8 is a partially broken front view showing another configuration example of the sound and
vibration generator according to the present invention.
[0039]
9 is an enlarged perspective view of a conventional plate spring.
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[0040]
10 is a cross-sectional view of a conventional sound and vibration generator.
[0041]
11 is an exploded perspective view of the sound and vibration generator.
[0042]
12 is a graph comparing the relationship between the frequency and the acceleration of the first
vibration system in the present invention and the prior art.
[0043]
13 is a graph comparing the change in acceleration when the frequency is increased or
decreased in the present invention and the prior art.
[0044]
14 is a graph showing the relationship between the frequency and the acceleration when
changing the input voltage in the present invention.
[0045]
15 is a graph showing the relationship between the frequency and the acceleration when the
input voltage is changed in the prior art.
[0046]
Explanation of sign
[0047]
(1) cylindrical case (11) bottom plate (12) relay terminal (13) relay terminal (14) spacer (2)
upper leaf spring (3) lower leaf spring (20) disc main body (21) central hole (22) ) Inner ring
portion (23) Outer ring portion (24) Arm portion (25) Long hole (26) first bend (27) second bend
(4) weight piece (41) lower yoke (42) upper yoke (5) Magnet (6) Coil (7) Diaphragm
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