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DESCRIPTION JP2001340812

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DESCRIPTION JP2001340812
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vibration generator for use in a mobile phone or the like for generating sound and vibration in
the same housing.
[0002]
2. Description of the Related Art Conventionally, there is a utility model registration 2570923 as
a technique in such a field. The device described in this publication is used for mobile phones
and the like to generate a buzzer sound and vibration, and supports a magnet arranged at the
center of a housing by a plate spring and generates a vibration for generating a magnet. It is used
as a mass. Further, in the device described in JP-A-10-93672, the center of the acoustic
diaphragm is connected to a weight via a spring so that the weight vibrates when the acoustic
diaphragm generates a low frequency. It is
[0003]
However, the above-described apparatus adopts a configuration in which a current is applied
from the outside of the housing through the lead wire connected to the movable coil. Therefore,
when used as a speaker, there is a possibility that the lead wire acts as a load on the acoustic
diaphragm to cause non-uniform vibration, and moreover, there is a problem that the lead wire is
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easily broken in the housing.
[0004]
The present invention has been made to solve the above-mentioned problems, and in particular,
it is an object of the present invention to provide a vibration generator which is less likely to
break the lead wire while generating well-balanced vibration.
[0005]
SUMMARY OF THE INVENTION A vibration generator according to the present invention is
disposed in a housing and is provided with an acoustic diaphragm having a movable coil, and is
disposed in the housing and fixed to the housing with the movable coil facing it. The fixed coil,
the lead wire drawn out of the case from the fixed coil, the magnetic circuit unit for causing the
current of the fixed coil to be induced to the movable coil, and the magnetic circuit unit are
supported in the case. As described above, the acoustic diaphragm is provided with a spring
connecting the magnetic circuit unit and the housing, and when an electric signal in the audio
frequency band is applied to the fixed coil, the spring is substantially balanced by the spring. Is
vibrated to generate sound, and when a low frequency electrical signal below the voice frequency
band is applied to the fixed coil, the interaction between the fixed coil and the magnetic circuit
unit causes the magnetism through the spring. Characterized in that the road section was set to
vibrate.
[0006]
In this vibration generator, when an electric signal in the voice frequency band is applied to the
fixed coil and current is induced in the movable coil to output sound (for example, voice or
ringing sound), the magnetic circuit unit is balanced by the spring. In this condition, the acoustic
diaphragm is vibrated.
In addition, when functioning as a vibrator, the magnetic circuit portion is vibrated through the
spring by the interaction between the fixed coil and the magnetic circuit portion by applying an
electric signal of low frequency lower than the audio frequency band to the fixed coil.
Such a vibration generator is used by being incorporated in a small device such as a mobile
phone, and a lead wire, an acoustic diaphragm, a magnetic circuit portion, etc. are accommodated
in a small housing, and the vibration generator is housed in the housing. The parts are in close
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proximity. Therefore, when the vibration generator of the present invention is used as a vibrator,
the fixed coil is connected to the lead wire so that the lead does not become a load on the
acoustic diaphragm, and the movable coil on the acoustic diaphragm side is not provided with a
wire. I made it. As a result, a well-balanced vibration can be generated without being affected by
the lead wire, and at the same time, the lead wire can be prevented from breaking open in the
housing. Moreover, since the whole magnetic circuit part is utilized as a mass of vibration, cost
reduction and simplification of a structure can also be achieved.
[0007]
Preferably, the fixed coil is fixed to the housing by the support extending from the side wall of
the housing, and the lead wire is drawn out of the housing from the fixed coil along the support.
Such a configuration is suitable for drawing a lead from the side wall of the housing.
[0008]
Preferably, the fixed coil is fixed to the housing by a support projecting from the bottom wall of
the housing, and the lead wire is drawn out of the housing from the fixed coil along the support.
Such an arrangement is suitable for drawing leads from the bottom wall of the housing.
[0009]
Preferred embodiments of the vibration generator according to the invention will now be
described in detail with reference to the drawings.
[0010]
As shown in FIG. 1, the vibration generator 1 is incorporated in a small communication device
such as a mobile phone and used, and has a function of generating sound (for example, voice
during a call or ringing tone at the time of an incoming call) And the generation function of
vibration (vibration at the time of an incoming call), but due to the structure of the telephone
equipment, the current situation is that further downsizing is still desired, and generating a wellbalanced vibration At the same time, there is a need for a vibration generator that is less likely to
break the lead wire.
[0011]
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The vibration generator 1 has a flat disk-shaped housing 2 having a diameter of 18 mm and a
thickness of about 4 mm, and a magnetic circuit unit 3 is accommodated in the center of the
housing 2.
The magnetic circuit unit 3 sandwiches the permanent magnet 5 between a columnar pole piece
4 disposed at the center of the housing 2, a ring-shaped permanent magnet 5 disposed to
surround the pole piece 4, and the permanent magnet 5. It comprises the yoke 6 which consists
of such upper yoke part 6a and lower yoke part 6b.
Accordingly, in the housing 2, the magnetic flux through the yoke 6 continues to be supplied
from the permanent magnet 5.
[0012]
In the annular magnetic gap G formed between the upper yoke portion 6 a and the pole piece 4,
the annular fixed coil 9 is disposed on the upper yoke portion 6 a side, and the annular movable
coil 7 is disposed on the pole piece 4 side. It is arranged. The fixed coil 9 constitutes a primary
coil on the outside of the movable coil 7 and is suspended from the end of a ring-shaped support
plate (supporting portion) 11 projecting inward from the side wall 2 a of the housing 2. It is
fixed. Then, the lead wire 12 is adhered and fixed along the surface of the support plate 11, and
the lead wire 12 is drawn out of the fixed coil 9 to the outside of the casing 2. The lead plate 12
can be properly drawn from the side wall 2 a of the housing 2 by such a support plate 11.
[0013]
Further, the movable coil 7 constitutes a secondary coil inside the fixed coil 9 and is adhesively
fixed to the acoustic diaphragm 8. The acoustic diaphragm 8 is formed of a polymer material and
is disposed so as to close the opening side of the housing 2. Therefore, by applying a current to
the fixed coil 9 by the lead wire 12 and inducing a current in the movable coil 7, the movable coil
7 moves up and down, and the acoustic diaphragm 8 can generate a voice following it.
[0014]
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Here, in order to reduce the cost and simplify the structure by utilizing the entire magnetic
circuit unit 3 as a mass of vibration, the magnetic circuit unit 3 and the housing 2 are connected
by a plate spring (spring) 10, The magnetic circuit unit 3 is used as a weight for vibration. The
free end of the ring-shaped leaf spring 10 is fixed to the lower yoke portion 6b, and supports the
magnetic circuit portion 3 from below at its free end. Also, by setting the leaf spring 10 to high
compliance and setting the acoustic diaphragm 8 to low compliance, the vibration width of the
magnetic circuit section 3 is extremely reduced (in a substantially balanced state) from the voice
diaphragm 8 The vibration generator 1 can be provided with two functions: a function of
generating a sound and a function of vibrating the housing 2 using the vibration width of the
magnetic circuit unit 3.
[0015]
That is, an electric signal in the audio frequency band is externally applied to the fixed coil 9
through the lead wire 12 to induce a current in the movable coil 7 to move the movable coil 7 up
and down, thereby following the acoustic diaphragm 8 is vibrated to output a sound of 750 Hz to
5 KHz from the acoustic diaphragm 8. At this time, since the movable coil 7 has a high signal
frequency, a large induced current flows to vibrate the acoustic diaphragm 8, and the magnetic
circuit unit 3 can not follow the high frequency, so that it does not substantially vibrate.
Therefore, the magnetic circuit unit 3 keeps maintaining the substantially balanced state on the
plate spring 10, and the sound is output from the vibration generator 1 without the housing 2
vibrating. The same applies to the case of generating a 2.7 KHz buzzer sound.
[0016]
On the other hand, when an electric signal of a low frequency (for example, 100 to 150 Hz) lower
than the audio frequency band is applied to the fixed coil 9, the movable coil 7 has a low signal
frequency and only a small induced current flows. On the other hand, the magnetic circuit
portion 3 on the high compliance side and the plate spring 10 resonate and vibrate. As a result,
the housing 2 vibrates, and the vibration generator 1 can function as a vibrator.
[0017]
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Since the lead wire 12 does not act as a load of the acoustic diaphragm 8 at the time of such
sound generation and vibration, it goes without saying that the movable coil 7 is vibrated when
the sound is generated. Even when the housing 2 and the housing 2 vibrate at the same time, a
well-balanced vibration is generated without being affected by the lead wire 12. In addition, it is
possible to avoid a situation where the lead wire 12 is violently broken in the housing 2 and
disconnected.
[0018]
The vibration generator of the present invention is not limited to the embodiment described
above. For example, when drawing out the lead wire 12 from the bottom wall 2 b of the housing
2, as shown in FIG. 2, a plurality of support portions 20 project from the bottom wall 2 b toward
the acoustic diaphragm 8, and the upper end of each support portion 20 The fixed coil 9 is fixed
to the Then, the lead wire 12 is discharged to the outside so as to pass through the inside of the
support portion 20. The lower yoke portion 6 b is provided with a through hole 21 into which
each support portion 20 is inserted, and the upper yoke portion 6 a and the housing 2 are
connected by a plate spring 10.
[0019]
Further, the vibration generator shown in FIG. 3 has an inner magnetic type magnetic circuit unit
30 in the housing 2. The magnetic circuit unit 30 includes a cup-shaped yoke 31, a cylindrical
permanent magnet 32 fixed in the yoke 31, and a pole piece 33 fixed to the top of the permanent
magnet 32. The fixed coil 9 and the movable coil 7 are disposed in the annular magnetic gap G
formed between the yoke 31 and the pole piece 33, and the upper portion of the yoke 31 and the
housing 2 are connected by the plate spring 10.
[0020]
As the vibration generator according to the present invention is configured as described above,
the following effects can be obtained. That is, an acoustic diaphragm having a movable coil while
being disposed in the casing, a fixed coil disposed in the casing and facing the movable coil and
fixed to the casing, and a lead drawn out of the casing from the fixed coil A spring connected
between the magnetic circuit portion and the housing so as to support the magnetic circuit
portion within the housing and the magnetic circuit portion disposed in the housing and causing
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the current of the fixed coil to be induced to the movable coil. And, when an electrical signal in
the audio frequency band is applied to the fixed coil, the acoustic diaphragm is vibrated to
generate sound in a state where the magnetic circuit portion is substantially balanced by the
spring, and low frequencies below the audio frequency band When the electric signal of the
above is applied to the fixed coil, the magnetic circuit unit is vibrated through the spring by the
interaction between the fixed coil and the magnetic circuit unit, thereby achieving balance. At the
same time to generate a good vibration, enabling vibration generator leads hardly broken.
[0021]
Brief description of the drawings
[0022]
1 is a cross-sectional view showing a first embodiment of a vibration generator according to the
present invention.
[0023]
2 is a cross-sectional view showing a second embodiment of a vibration generator according to
the present invention.
[0024]
3 is a cross-sectional view showing a third embodiment of a vibration generator according to the
present invention.
[0025]
Explanation of sign
[0026]
DESCRIPTION OF SYMBOLS 1 ... Vibration generator, 2 ... Body, 3, 30 ... Magnetic circuit part, 4,
33 ... Pole piece, 5, 32 ... Permanent magnet, 6, 31 ... Yoke, 7 ... Moving coil, 8 ... Acoustic
diaphragm, 9 ... fixed coil, 10 ... leaf spring (spring), 11, 20 ... support portion, 12 ... lead wire.
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