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JP2005021854

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DESCRIPTION JP2005021854
PROBLEM TO BE SOLVED: To provide a speaker with a vibration motor having a vibration
function. SOLUTION: In a speaker with a vibration motor having a vibration motor, the vibration
motor is magnetically coupled to a permanent magnet of two poles via a motor gap and a rotor
having a permanent magnet of two poles whose eccentric weight is fixed to a rotor shaft. A step
motor comprising a two-pole flat stator and a drive coil magnetically coupled to the two-pole flat
stator, the speaker comprising a speaker housing comprising a circular permanent magnet, a
yoke, a voice coil and the yoke It is an electromagnetic speaker. [Selected figure] Figure 1
Speaker with vibration motor
[0001]
The present invention relates to a speaker with a vibration motor, and more particularly, to the
technical field of an electromagnetic speaker having a vibration motor including a flat stator
having two poles, a rotor having two permanent magnets, and a drive coil.
[0002]
Currently, electromagnetic microminiature speakers are commonly used to generate voice in
handsets or melody generators of portable electronic devices such as mobile phones.
In addition, a microminiature brushed DC motor having an eccentric weight attached to a rotor
shaft is the mainstream of the technology for generating vibration. On the other hand, in such
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1
market conditions, recently, in order to reduce the number of parts and to reduce the size and
cost of portable electronic devices, a speaker with vibration function is added to the conventional
electromagnetic microminiature speaker with vibration function. Proposals for multifunctional
electronic components are being made one after another. Therefore, first, the above-mentioned
speaker with vibration alarm function will be described as an example of the conventional
technology of multifunctional electronic components, and then, the conventional technology of
the single-functional vibration step motor of patent 3258125 of the applicant's invention will be
described. Do.
[0003]
A conventional speaker with vibration function is disclosed, for example, in JP-A-2000-334377,
and FIG. 5 shows a cross-sectional view of the conventional speaker with vibration function. The
conventional speaker with vibration function 50 has an electrodynamic speaker structure, and is
disposed in a gap portion 55a of a magnetic circuit including a yoke 55 serving as a housing, a
permanent magnet 54 magnetized in the thickness direction and a plate 56. A cylindrical voice
coil 53 disposed and wound on a bobbin 59, a vibrating body 51 to which the bobbin 59 is fixed,
and a yoke 55 provided in the yoke 55 and connected to an air chamber 55d of the voice coil 53
A voice signal voltage is applied to the voice coil 53 and a voice signal current is supplied to
drive the voice coil 53 and vibrate the vibrating body 51 to generate voice. Speaker. The point of
difference from the conventional speaker is that the vibrating body 51 is not fixed directly to the
yoke 55, but is fixed to the yoke 55 via a damper 57 attached to the bobbin 59. Next, a method
of generating vibration will be described.
[0004]
That is, by applying an oscillating signal voltage having a frequency lower than that of the audio
signal voltage to the voice coil 53 and supplying an oscillating signal current, the voice coil 53 is
driven, and a circle provided on the bobbin 59 of the voice coil 53 The annular flat portion 58 is
also driven to collide with the collision portion 52 fixed to the yoke 55, and the speaker with
vibration function 50 generates vibration.
[0005]
JP, 2000-334377, A Patent 3258125
[0006]
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2
By the way, the speaker with vibration function 50 has a fundamental problem with respect to
the driving force or vibration force for driving the voice coil 53.
It is as described below.
That is, the vibrational force is obtained by the following equation 1.
[0007]
[0008]
In Equation 1, the vibrational force F of the voice coil 53 is represented by the sum of the
vibrational force ΔF acting on the coil segment Δl of the voice coil 53 along the circumference
of the voice coil 53, and the coil segment Δl and this coil The angle formed by the magnetic flux
density B of the gap portion 55a in the piece Δl is 90 degrees as shown in FIG. 5, and the
magnetic flux density B is constant on the circumference of the voice coil 53. The vibrational
force F acting on is expressed by the product of the vibration signal current I supplied to the
voice coil 53, the voice coil length l of the gap 55a and the magnetic flux density B of the gap
55a.
The vibration force represented by the equation 1 vibrates the voice coil 53 to generate sound,
and applies an audio signal voltage to the voice coil 53 to operate the speaker 50 with vibration
function as a speaker. The present invention is also applicable to the case of supplying an audio
signal current.
[0009]
Here, the vibration force F of the voice coil 53 is estimated. Assuming that the vibration signal
current I is 100 mA, the voice coil length l of the gap 55a is 2 m, and the magnetic flux density B
of the gap 75a is 5000 G (Wb / m <2>), F is 0.1 N (approximately 10 gf Is estimated. On the
other hand, the vibration force generated by the conventional brushed DC motor used in mobile
phones etc., that is, the centrifugal force acting on the eccentric weight attached to the rotor
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3
shaft, is generally 50 to 100 gf. Although the vibration force F is too small compared to the
vibration force of the brushed DC motor, there is also a problem that the vibration of the speaker
with the vibration function is hardly felt as a vibration even in practice. By the way, although it is
estimated that 500 mA to 1 A is required as the vibration signal current I to make the vibration
force F equal to that of a brushed DC motor, the consumption current is so large that it can not
be used in portable electronic devices. There was a problem.
[0010]
Next, a conventional technique of a single function vibration step motor having only a vibration
function will be described.
[0011]
The top view (a) and CC sectional drawing (b) of the conventional vibration step motor are shown
in FIG.
The conventional vibration step motor 30 is magnetically coupled to the flat stator 31 and the
flat stator 31 by magnetically coupling the flat stator 31 and the flat stator 31 to the flat stator
31 via the gap portion 31a and by the detent torque. An eccentric weight 34 is attached to the
rotor shaft 32b, and generates vibration by rotating the vibration step motor 30 at a high speed.
The drive coil 33 is composed of a coil 33b wound around a core 33a. Can. The consumption
current at high speed rotation is about 20 mA, and a vibration force of about 100 gf is generated,
so both the consumption current and the vibration force are practically sufficient. The driving
method for rotating the vibration step motor 30 at a high speed is described in detail in Japanese
Patent No. 3258125 of the applicant's invention, and thus the description thereof is omitted.
[0012]
Next, a method of generating the detent torque of the vibration step motor 30 will be described.
The vibration step motor 30 shifts the substantially semicircular step portions 31 b and 31 c of
the rotor hole 310 facing the rotor 32 of the flat stator 31 in the direction of the slit portions 31
d and 31 e of the flat stator 31. 3 to generate a detent torque, and has a magnetic stability point
in the direction of a line segment M3-M3 at about 45 degrees from the direction of the slit
portions 31d and 31e shown in the plan view (a) of FIG. The magnetic poles N and S are stopped
so as to be in the direction of the line segment M3-M3.
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[0013]
Similarly, FIG. 4 shows a plan view (a) and another cross-sectional view (b) of another
conventional vibration step motor. In the other conventional vibration step motor 40, the rotor
hole 410 of the flat stator 41 facing the rotor 32 is different from the rotor hole 310 of the
vibration step motor 30 shown in FIG. 3, so only the rotor hole 410 will be described. . The rotor
hole portion 410 is a perfect circular shape having notches 41b and 41c in place of the
substantially semicircular step portions 31b and 31c of the rotor hole portion 310 of the
vibration step motor 30 shown in FIG. The step motor 40 has a magnetically stable point in the
direction of a line segment M4-M4 substantially in the same direction as the line segment M3M3 direction of the vibration step motor 30, and the rotor 32 is a magnetic pole N of the
permanent magnet 32a. -Make it stand still in the M4 direction.
[0014]
The present invention has the following configuration in order to solve the problems of the
above-described vibration force and current consumption of the conventional speaker with a
vibration motor function. In a speaker with a vibration motor having a vibration motor, the
vibration motor is a rotor having a two-pole permanent magnet whose eccentric weight is fixed
to a rotor shaft, and a two-pole flat that magnetically couples with the two-pole permanent
magnet via a motor gap. A step motor comprising a stator and a drive coil magnetically coupled
to the two flat stators, wherein the speaker is an electromagnetic speaker comprising a disk-like
permanent magnet, a yoke, a voice coil and a speaker housing comprising the yoke. It is
characterized by being.
[0015]
The speaker with vibration motor according to the present invention is a speaker for sound and a
vibration motor with a brush DC motor for vibration, which are used in portable electronic
devices such as mobile phones, and the like. As it can be realized, in particular, there is an effect
that a small and low cost portable electronic device can be provided.
[0016]
The structure in which the center of the disk-shaped permanent magnet which is the center of
the electromagnetic speaker and the rotor axial direction which is the center of the vibration
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motor except for the coil portion are aligned and laminated in the thickness direction This is a
best mode for thinning, and the best mode for implementing the present invention of a speaker
with a vibration motor will be described in detail below based on the drawings.
[0017]
FIG. 1 shows an AA cross-sectional view (a) and a plan view (b) of a first embodiment of a
speaker with a vibration motor according to the present invention.
The speaker with vibration motor 10 of the present invention is a disk-shaped permanent magnet
having the disk-shaped vibration motor 12 at the center of the speaker 11 except for the diskshaped speaker 11 and the drive coil portion 122 a having the drive coil 122. It forms by making
the center of 110, and the rotor shaft 120b direction of this vibration motor 12 correspond, and
mutually laminating | stacking in the thickness direction.
[0018]
The speaker 11 forms a magnetic circuit with the permanent magnet 110 and the plate 111 via a
disc-shaped permanent magnet 110, a plate 111 attached to the upper surface of the permanent
magnet 110, and a gap portion 112a, and vents 112c. The voice coil 113 attached to the
diaphragm 114 is disposed in the gap portion 112a, and a voice signal voltage is applied to the
voice coil 113. An audio signal current is supplied to the voice coil 113, and the driving force
represented by the equation 1 works to generate an audio by vibrating the diaphragm 114.
[0019]
On the other hand, the vibration motor 12 is magnetically coupled to the flat stator 121 and the
rotor 120 comprising the flat stator 121 and the rotor permanent magnet 120a which is
magnetically coupled to the flat stator 121 and the motor gap portion 121a via the motor gap
portion 121a. The stepper motor has a drive coil 122 composed of a coil 122b wound around a
coil core 122a, and an eccentric weight 123 is attached to the rotor shaft 120b.
[0020]
Next, a method of generating the detent torque of the vibration motor 12 will be described.
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The vibration motor 12 shifts the substantially semicircular stepped portions 121c and 121d of
the rotor hole 121b facing the rotor 120 of the flat stator 121 to each other in the direction of
the slits 121e and 121f of the flat stator 121. , Generates a detent torque, and has a magnetic
stability point in the direction of a line segment M1-M1 of about 45 degrees from the direction of
the slit parts 121e and 121f shown in the plan view (b) of FIG. It is stopped so that the magnetic
poles N and S of 120a are in the direction of the line segment M1-M1.
[0021]
One rotor bearing 120c of the rotor shaft 120b is provided at the center of the circular bottom
portion 112b of the yoke 112 of the speaker 11, and one rotor bearing 120d corresponds to the
vent hole 112c of the speaker 11. The eccentric weight thick portion 123a of the eccentric
weight 123 of the vibration motor 12 is disposed in the recess space 115a of the speaker 11, and
the speaker 10 with a vibration motor is thin. It has a structure of
[0022]
The technology disclosed in Japanese Patent No. 3258125 can be used to rotate the vibration
motor 12 at high speed to operate as a vibration motor (about 10000 rpm rotation per minute),
and the vibration motor can be used. When the voltage applied to the MON terminal of the drive
IC on the drive circuit board (not shown) incorporated in the speaker 10 is set to H level, the
vibration motor 12 starts and rotates at high speed, and the conventional vibration shown in FIG.
Similar to the step motor 30 or 40, when the current consumption at high speed rotation is about
20 mA, about 100 gf of vibration force can be generated.
[0023]
FIG. 2 shows a cross-sectional view (a) and a plan view (b) of the second embodiment of the
speaker with vibration motor of the present invention taken along the line B-B.
In the speaker 20 with a vibration motor of the present invention, the structure of the speaker 10
with a vibration motor and the flat stator 221 shown in FIG. 1 is different, and a flat for
generating a detent torque to make the rotor permanent magnet 220a stand still in the M2-M2
direction. The rotor hole portion 221b of the stator 221 is composed of two notches 221c and
221d and two narrow portions 221e and 221f.
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The other structure and vibration function are the same as those of the speaker with vibration
motor 10, and the description will be omitted.
[0024]
In an EE sectional view (a) and a plan view (b) of the third embodiment of the speaker with
vibration motor according to the present invention shown in FIG. 6, the speaker 60 with vibration
motor is the speaker 10 with vibration motor of FIG. Differently, a portion close to the drive coil
122 of the vibration motor 12 of the speaker housing 615a in which the yoke 612 doubles is
replaced by the speaker housing nonmagnetic portion 615b, and the structure on the speaker
function due to the magnetic interference of the vibration motor 12 is reduced. It has become.
The other structure and vibration function are the same as those of the speaker with vibration
motor 10, and the description will be omitted.
[0025]
As shown by the above detailed description, the speaker with a vibration motor according to the
present invention is a speaker for voice and a direct current motor with a brush for vibration,
which are used in portable electronic devices such as mobile phones. It is possible to replace as a
motorized speaker.
[0026]
It is sectional drawing (a) and a top view (b) of 1st Example of the speaker with a vibration motor
of this invention.
(Embodiment 1) FIG. 6 (a) is a cross-sectional view of a second embodiment of the speaker with a
vibration motor according to the present invention, and FIG.
(Embodiment 2) A plan view (a) and a sectional view (b) of a conventional vibration step motor. It
is the top view (a) and sectional drawing (b) of the other conventional vibration step motor. It is
sectional drawing of the conventional speaker with a vibration function. It is sectional drawing (a)
and a top view (b) of 3rd Example of the speaker with a vibration motor of this invention.
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(Example 3)
Explanation of sign
[0027]
10, 20, 60 Speakers with Vibration Motors 11, 61 Speakers 12, 22 Vibration Motors 32a, 54,
110 Permanent Magnets 55, 112, 612 Yoke 53, 113 Voice Coils 114 Vibrators 32, 120, 220
Rotors 120a, 220a For Rotor Permanent magnet 33, 122, 222 Drive coil 34, 123, 223 Eccentric
weight
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