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JP2005007370

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DESCRIPTION JP2005007370
An object of the present invention is to provide a vibration stepper motor with a speaker having a
speaker function and a vibration function. A rotor comprising a two-pole flat step motor, a twopole permanent magnet magnetically coupled with the two-pole flat stator via a gap, and stopped
by a detent torque, and a magnetic coupling with the two-pole flat stator. In the step motor
constituted by the driving coil, the core body 120 consisting of the two cores and the core gap
portion and forming the magnetic circuit with the two-pole permanent magnet is provided on the
upper surface portion of the permanent magnet And a voice coil 15 of an optimal structure for
voice is arranged in the core gap portion, and a diaphragm 1500 is provided to enable provision
of a speaker function. [Selected figure] Figure 1
Multifunctional stepper motor
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
multi-function step motor, and more particularly to a multi-function step motor comprising a flat
stator having two poles, a rotor having two permanent magnets, and a drive coil. 2. Description
of the Related Art At present, electromagnetic microminiature speakers are often used to
generate sound in a receiver or melody generator of a portable electronic device such as a
portable telephone. In addition, a microminiature brushed DC motor having an eccentric weight
attached to a rotary shaft is the main flow for generating vibration. On the other hand, in such
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
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the single-functional vibration step motor of patent 3258125 of the applicant's invention will be
described. Do. A conventional speaker with vibration function is disclosed, for example, in
Japanese Patent Application Laid-Open No. 2000-334377, and FIG. 7 shows a cross-sectional
view of the conventional speaker with vibration function. The conventional speaker with
vibration function 70 has an electrodynamic speaker structure, and is disposed in a gap portion
75a of a magnetic circuit composed of a yoke 75 serving as a housing, a permanent magnet 74
magnetized in the thickness direction and a plate 76. A cylindrical voice coil 73 disposed and
wound on a bobbin 79, a vibrating body 71 to which the bobbin 79 is fixed, and a yoke 75
provided in the yoke 75 and connected to an air chamber 75d of the voice coil 73 The voice coil
73 is driven by applying an audio signal voltage to the voice coil 73 and supplying an audio
signal current to generate voice by vibrating the vibrating body 71. Speaker. The point different
from the conventional speaker is that the vibrating body 71 is not fixed directly to the yoke 75,
but fixed to the yoke 75 via a damper 77 attached to a bobbin 79. Next, a method of generating
vibration will be described. That is, by applying an oscillating signal voltage having a frequency
lower than that of the audio signal voltage to the voice coil 73 and supplying an oscillating signal
current, the voice coil 73 is driven and provided on the bobbin 79 of the voice coil 73. The
annular flat portion 78 is also driven to collide with the collision portion 72 fixed to the yoke 75,
and the speaker with vibration function 70 generates vibration.
The above-described speaker with vibration function 70 has a fundamental problem with respect
to the driving force or vibration force for driving the voice coil 73. It is as described below. That
is, the vibrational force is obtained by the following equation 1. In Equation 1, the vibration force
F of the voice coil 73 acts on the coil segment Δl of the voice coil 73. The vibration force
.DELTA.F is represented by the sum along the circumference of the voice coil 73, and the angle
between the coil segment .DELTA.l and the magnetic flux density B of the gap portion 75a at this
coil segment .DELTA.l is 90 degrees as shown in FIG. Since the magnetic flux density B is
constant on the circumference of the voice coil 73, the vibration force F acting on the voice coil
73 eventually results in the vibration signal current I supplied to the voice coil 73 and the gap
portion 75a. It is represented by the product of the voice coil length l of the above and the
magnetic flux density B of the gap 75a. Note that the vibration force represented by equation 1
vibrates the voice coil 73 to generate sound, and applies an audio signal voltage to the voice coil
73 to operate the speaker with vibration function 70 as a speaker. The present invention is also
applicable to the case of supplying an audio signal current. Here, the vibration force F of the
voice coil 73 will be estimated. Assuming that the vibration signal current I is 100 mA, the voice
coil length l of the gap 75a 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 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
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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. Next, a conventional technique of a single function
vibration step motor having only a vibration function will be described.
FIG. 3 shows a plan view (a) and a cross-sectional view (b) of the conventional vibration step
motor. 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. 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. Similarly, FIG. 4 shows a plan
view (a) and a 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 M3-M3 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. The
present invention provides a vibration stepper motor with a speaker function provided with a
speaker function to the vibration stepper motor structure in order to solve the problems of the
vibration force and the current consumption of the above-mentioned conventional speaker with
vibration motor function. The purpose is
In order to achieve the above-mentioned problems, the present invention has the following
constitution. A rotor comprising a two-pole flat stator, a two-pole permanent magnet
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magnetically coupled to the two-pole flat stator via a gap, and stopped by a detent torque, and a
drive coil magnetically coupled to the two-pole flat stator In the stepper motor configured, the
stepper motor has a core body formed of two cores and a core gap portion and forming a
magnetic circuit with the two-pole permanent magnet on the upper surface portion of the
permanent magnet, and the gap By having a part, a voice coil disposed in the core gap part, and a
disk-shaped diaphragm fixed to the voice coil, it has a function as a speaker. DETAILED
DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present
invention will be described in detail with reference to the drawings, taking a vibration stepper
motor with a speaker function as an example in a multi-function stepper motor. FIG. 1 shows a
plan view (a) and a cross-sectional view (b) of the first stepper motor with a speaker function of
the present invention. The vibration stepper motor with speaker 10 according to the present
invention is coupled to the flat stator 11 and the flat stator 11 via the gap portion 11a, and the
flat stator 11 is a rotor 12 composed of two permanent magnets 12a which are stopped by
detent torque. It consists of two cores 120a and 120b disposed via a space on the upper surface
of the permanent magnet 12a and the two drive coils 131 and 132, the voice coil 15 and the
permanent magnet 12a, which are magnetically coupled, as described with reference to FIG. 5 or
FIG. The two-pole permanent magnet, the core body 120 forming a magnetic circuit, and the
disc-shaped diaphragm 1500 are provided. In the plan view of FIG. 1 (a), the housing 19, the
base 191 and the airtight plate 192 shown in the cross-sectional view of FIG. 1 (b) are omitted in
order to avoid the illustration being complicated and difficult to see. Next, each component will
be described in detail. An eccentric weight 14 is attached to the rotor shaft 12 b, and a circuit
board 16 on which a driver IC 18 for driving the vibration stepping motor 10 with a speaker is
mounted is provided on the flat stator 11. By setting the circuit board 16 to the power supply
terminals 16a and 16b for the driver IC and the MON terminal 17 as an input terminal for the
motor start and stop signals (a system for starting the step motor when power is supplied to the
power supply terminals 16a and 16b , MON terminal 17 can be omitted.
The voice coil connection terminals 15b and 15c to which the voice coil terminal 15a of the voice
coil 15 described with reference to FIG. 5 is connected are provided. The drive coils 131 and 132
are manufactured by winding the coils 131b and 132b around the coil cores 131a and 132a,
respectively, and have symmetrical positions with respect to a plane perpendicular to the cross
section AA through the rotor shaft 12b. Is located in Although the number of drive coils may be
one, the drive coils 131 and 132 become thin by dividing them into two drive coils 131 and 132,
so that the vibration stepper motor with speaker 10 can be thinned. Next, the operation of the
vibration stepper motor with speaker 10 of the present invention will be described. In order to
operate the stepping motor at a high speed (about 10000 rpm rotation per minute) to operate as
a vibration step motor, the technique disclosed in the patent 3258125 of the applicant's
invention may be used. When the voltage applied to the MON terminal 17 is set to H level, the
vibration stepper motor with speaker 10 is started to rotate at high speed, and the high speed
rotation is performed as in the conventional vibration stepper motor 30 or 40 shown in FIG.
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When the current consumption is about 20 mA, an oscillating force of about 100 gf can be
generated. Next, when the voltage applied to the MON terminal 17 is set to L level, the rotor 12
is stopped by the detent torque so that the directions of the magnetic poles N and S of the
permanent magnet 12a become the line segment M1-M1. . When a voice voltage is applied to the
voice coil connection terminals 15b and 15c when the rotor 12 is at rest, a voice current is
supplied to the voice coil 15, the voice coil 15 is driven, the diaphragm 1500 vibrates, and a
voice is generated. Thus, the vibration stepper motor with speaker 10 of the present invention
also functions as a speaker. FIG. 2 shows a plan view (a) and a cross-sectional view (b) of the
vibration stepper motor with a second speaker according to the present invention. The vibration
step with speaker 20 of the present invention is different from the vibration step motor with
speaker 10 shown in FIG. 1 only in the structure of the flat stator 21, so only the flat stator 21
will be described. The rotor hole portion 210 of the flat stator 21 for generating the detent
torque has two notches 21b and 21c and two narrow portions 21d and 21e. The vibration
stepper motor with speaker 20 according to the present invention can have a speaker function
and a vibration function as the vibration stepper motor with speaker 10 shown in FIG.
As in the plan view of FIG. 1 (a), in the plan view of FIG. 2 (a), the housing 19 shown in the crosssectional view of FIG. , The base 191 and the airtight plate 192 are omitted. Next, the structure of
the voice coil will be described in detail. FIG. 5 is formed by one voice coil 15 composed of voice
coil portions 51a and 52a and flat portions 51b and 52b shown in FIGS. 1 to 2, a permanent
magnet 12a, and two cores 120a and 120b. The core mounting portion 121 of the base 191 for
mounting the core body 120 shown in FIG. 1 or FIG. It has been omitted to avoid being
cumbersome and difficult to see. FIG. 4 is a perspective view of a magnified view (as viewed from
the diaphragm 150 side in FIG. 1 or 2). And has two voice coil terminals 15a, and a line L1connecting the middle point 15c between the coil ends 15b and 15d of the voice coil portion 51a
and the middle point 15f between the coil ends 15e and 15g of the voice coil portion 52a. The
voice coil 15 is fixed to the diaphragm 1500 so that L1 comes in the N or S magnetic pole
direction of the permanent magnet 12a when the rotor 12 comes to rest with detent torque, that
is, M1-M1 or M2-M2 direction. A line segment N1-N1 connecting the centers of the permanent
magnets 12a via a space on the upper surface portion of the permanent magnet 12a is the N, S
magnetic pole direction of the permanent magnet 12a when the rotor 12 is stopped by the
detent torque, that is, M1. -Arrange the two cores 120a and the core 120b of the core body 120
in the core mount portion 121 so as to be in the M1 or M2-M2 direction. And it makes it possible
to provide the maximum driving force to the voice coil 15. Here, the driving force acting on the
voice coil 15 when the voice signal voltage is applied to the voice coil terminal 15a will be
described. In FIG. 5, the voice signal current I in the clockwise direction flows through the coil
segment Δl of the voice coil portion 51a, and the magnetic flux density B of each coil segment
Δl1 and the coil segment Δl1 of the voice coil portion 51a form an angle θ Thus, the driving
force F1 acting on the voice coil portion 51a is expressed as the sum of the driving forces
.DELTA.F1 acting on the coil segments .DELTA.l1 of the voice coil portion 51a, as shown in
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equation 2. [Math. Here, l1 is the voice coil length of the voice coil unit 51a, and n1 is a coil
element of the voice coil unit 51a. It is the number of pieces of piece Δl1.
Similarly, in FIG. 5, the voice coil portion 51 a corresponds to the coil piece Δl 1 of the voice coil
portion 51 a and corresponds to the coil piece Δ l 2 of the voice coil portion 52 a at a position of
180 degrees with respect to the rotor shaft 12 b. Since the voice signal current I in the
counterclockwise direction, which is the reverse direction, flows, and the magnetic flux density B
of each coil segment Δl 2 and the coil segment Δl of the voice coil portion 52a similarly form an
angle θ, the voice coil portion 52a The acting driving force F2 acts on each of the coil segments
Δl2 of the voice coil portion 52a, and the sum of the driving forces ΔF2 acting in the same
direction as the driving force ΔF1 acting on the current segment Δl1 of the voice coil portion
51a Similar to 2, it is expressed as shown in equation 3. Where l2 is the voice coil length of the
voice coil portion 52a, and n2 is the coil element length of the voice coil portion 52a. <Img class
= "EMIRef" id = "198765467-000005" /> It is the number of pieces Δl 2. Furthermore, the flat
portion 51b of the voice coil 15 is formed by the core 120a and the core 120b, and is disposed
in the core gap 121 where the magnetic flux returned from the permanent magnet 12a through
the core body 120 leaks substantially uniformly. Because of this, the driving force F3 acting on
the flat portion 51b is expressed as the sum of the driving force .DELTA.F3 acting on the current
segment .DELTA.13 of the flat portion 51b, as shown in Formula 4. Where l3 is the voice coil
length of the flat portion 51b, and n3 is a coil segment Δl3 of the flat portion 51b. <Img class =
"EMIRef" id = "198765467-000006" /> Is the number of Similarly, the flat portion 52 b of the
voice coil 15 is formed by the core 120 a and the core 120 b, and is disposed in the core gap
121 where the magnetic flux flowing back from the permanent magnet 12 a through the core
body 120 almost uniformly leaks. Therefore, the driving force F4 acting on the flat portion 52b is
expressed as the sum of the driving force .DELTA.F4 acting on the current segment .DELTA.14 of
the flat portion 52b, as shown in equation 5. Where l4 is the voice coil length of the flat portion
52b, and n4 is the coil segment Δl4 of the flat portion 52b. Is the number of
Therefore, the driving force F 0 acting on the voice coil 15 is the sum of the driving forces F 1, F
2, F 3 and F 4 acting on the voice coil portion 51 a, the voice coil portion 52 a and the flat
portions 51 b and 52 b. expressed. Here, the sum of each of the coil segments Δl 1, Δl 2, Δl 3,
Δl 4 of the voice coil 15 can be expressed as a magnetic flux Assuming that the density B is
substantially constant, θ is about 90 degrees, and sin θ is about 1, taking the angular range of
the circumference of the voice coil portions 51a and 52a and the flat portions 51b and 52b, the
driving force F0 acting on the voice coil 15 Is approximated by equation 7. The angular range of
the circumference of the voice coil portions 51a and 52a is about 130 degrees, and the entire
circumference is approximately 130 degrees. <Img class = "EMIRef" id = "198765467-00009" />
Since it becomes about 260 degrees, the driving force acting on the voice coil 15 of the vibration
step motor 10 or 20 according to the present invention is 260 degrees / 360 degrees as
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compared to the driving force acting on the voice coil 73 of the conventional speaker 70 with
vibration motor Is estimated to be reduced by about 30%, but the driving force acting on the
voice coil 73 of the conventional speaker with a vibration motor 70 is compensated by about
30% by the driving force acting on the flat portions 51b and 52b. It can give equal driving power.
The voice coil 150 shown in FIG. 6 is replaced by the voice coil 15 shown in FIG. 5, and a coil
151 having the ends 151b and 151d and its midpoint 151c, and a coil having the ends 152b and
152d and the midpoint 152c. A voice coil constituted by 152, a line segment L2-L2 connecting
an intermediate point 151c of the coil 151 and an intermediate point 152c of the coil 152 is N, S
of the permanent magnet 12a when the rotor 12 is stopped by the detent torque. The voice coil
150 is fixed to the diaphragm 1500 so as to be in the magnetic pole direction, that is, in the M1M1 or M2-M2 direction, and a line segment N1-N1 connecting the centers of the respective
members is the detent torque of the rotor 12. Comes in the N or S magnetic pole direction of the
permanent magnet 12a when stationary, that is, in the M1-M1 or M2-M2 direction As described
above, by arranging the two cores 120a and the core 120b of the core body 120 on the core
mount portion 121 with a space on the upper surface of the permanent magnet 12a, the voice
coil 15 is given maximum driving force. be able to.
When the voice coil 15 constituting the vibration stepper motor 10 or 20 with a speaker shown
in FIG. 1 or 2 is changed to the voice coil 150 and a voice signal voltage is applied to the voice
coil 150, the voice coil portion 61 a and When two coils 151, 152 constituting the voice coil 150
are connected in series by an external circuit (not shown) so that the voice signal current flowing
in the voice coil 62a flows in the opposite direction to each other by I. For example, a speaker for
a handset of a mobile phone can be configured (however, the voice coil connection terminals 15b
and 15c for the voice coil terminal 15a on the circuit board 16 are connection terminals for the
coil terminals 151a and 152a (not shown)) Need to change to Similarly, when a voice signal
voltage is applied to the voice coil 150, the voice coil current flows in the voice coil portion 61a
and the voice coil 62a so that the voice signal currents I flow in opposite directions to each other.
When the connection of the two coils 151 and 152 that make up the switching circuit is switched
in parallel by the external circuit, the DC resistance value of the voice coil 150 is 1/1 compared
to the case of the series connection of the two coils 151 and 152. It is possible to be able to
configure a speaker for a melody generator, which can be 4 and which requires more power to
generate sound. Regardless of whether the two coils 151 and 152 constituting the voice coil 150
are connected in series or in parallel, as shown in FIG. 6, the voice signal current is clockwise in
the coil segment Δl 1 of the voice coil portion 61 a On the other hand, when the voice signal
voltage is applied to the voice coil 150 so that the voice signal current I flows counterclockwise
in the coil segment Δl2 of the voice coil portion 62a, the driving force acting on the voice coil
portions 61a and 62a Are respectively equations of driving force of the voice coil 15, and can be
expressed by Eqs. 2 and 3, and driving forces acting on the flat portions 61b and 62b can be
represented by Eqs. 5 can be expressed by the number 6 of the voice coil 15 shown in FIG. The
voice coil 15 or 150 shown in FIG. 5 or 6 applies an audio signal voltage and supplies an audio
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signal current, thereby setting one voice coil portion 51 a and a flat portion 51 b, and another
set. Of the voice coil portion 52a and the flat portion 52b or one set of the voice coil portion 61a
and the flat portion 61b, and the other set of the voice coil portion 62a and the flat portion 62b
are driven to have the same driving force By doing this, it is possible to drive the same level as
the voice coil 73 capable of equalizing all the driving forces acting on the current segments Δl
along the circumferential direction shown in FIG. it can.
In order to achieve this, according to the above equation 5, the voice signal current supplied to
each voice coil portion and the flat portion is the same, and the voice coil lengths l1 and l2 of the
respective voice coil portions are equal and flat. It can be understood that the voice coil lengths
l3 and l4 of the parts should be equal. The air chamber 153 or 154 of the voice coil 15 shown in
FIG. 1 or 2 is formed by a disc-shaped base 191 disposed so that the diaphragm 1500 side of the
drive coils 131 and 132 overlaps the stator 11 or 21. It is provided by sealing and sealing the
side opposite to the diaphragm 1500 with respect to the voice coil 15 with an airtight plate 192,
and ventilation at the time of vibration of the voice coil 15 is performed through a plurality of
vent holes 19a provided in the housing 19. . The rotor shaft 12 b of the vibration stepper motor
10 or 20 with a speaker is received by a housing 19 and rotor bearings 12 c and 12 d provided
on the airtight plate 192. In the top view (a) and the E-E cross-sectional view (b) of the third
vibration stepper motor with speaker according to the present invention shown in FIG. Unlike the
vibration stepper motor with speaker 1, the rotor shaft 81 b is received only by the rotor bearing
81 c of the housing 81, and is fixed to the rotor bearing 81 c of the housing 81 by the rotor shaft
stopping meling 81 d. The other structure is the same as that of the vibration step motor 10 with
the speaker, and the description will be omitted. When the gravity moment of the eccentric
weight applied to the rotor shaft 12a or 81b is maximized when using the portable device
equipped with the vibration stepper motor 10, 20 or 80 of the present invention in various
postures, or Although the portable device may be shaken from the outside, the vibration stepper
motor 10, 20 or 80 with a speaker can keep the deviation from the normal static angular
position of the rotor 12 or 81 within several degrees by its detent torque. It is possible to slightly
suppress the fluctuation of the driving force acting on the voice coil 15, and it does not cause
deterioration of the sound generated by the receiver or the melody generator. As can be
understood from the above description, according to the present invention, by providing the
voice coil 15 having an optimum structure for voice and the core body 120 at an optimum
position to apply a driving force to the voice coil The two-pole permanent magnet 12a and the
flat stator 11 or 21 which can be stopped at positions can be shared as components of the
speaker and the vibration step motor to realize the vibration step motor 10, 20 or 80 with a
speaker.
As has been shown by the above detailed description, the vibration stepper motor with a speaker
according to the present invention is comparable to the speaker for voice used in portable
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electronic devices such as portable telephones. The speaker function of the performance and the
vibration function of the same performance as that of the brushed DC motor for vibration can be
realized by one stepping motor with a speaker function, so that it is particularly effective to
provide a small and low cost portable electronic device. . BRIEF DESCRIPTION OF THE
DRAWINGS FIG. 1 is a plan view (a) and a cross-sectional view (b) of a first embodiment of a
vibration stepper motor with a speaker function according to the present invention. FIG. 2 is a
plan view (a) and a cross-sectional view (b) of an embodiment of a vibration stepper motor with a
speaker function according to a second embodiment of the present invention. FIG. 3 is a plan
view (a) and a cross-sectional view (b) of a conventional vibration step motor. FIG. 4 is a plan
view (a) and a cross-sectional view (b) of another conventional vibration step motor. FIG. 5 is a
perspective view of a voice coil of the present invention. FIG. 6 is a perspective view of another
voice coil of the present invention. FIG. 7 is a cross-sectional view of a conventional speaker with
vibration function. 8 (a) and 8 (b) are sectional views of an embodiment of a vibration stepper
motor with a speaker function according to a third embodiment of the present invention.
[Description of the code] 10, 20, 80 vibration step motor with speaker 30, 40 vibration step
motor 11, 21, 31, 41 Flat stator 12, 32, 81 Rotor 12a, 32a Permanent magnet 131, 132, 33
Drive coil 14, 34, 84 eccentric weight 15, 150 voice coil 51a, 52a, 61a, 62a voice coil portion
51b, 52b, 61b, 62b flat portion 16 circuit board 17 MON terminal 18 driver IC 19 81 housing
19a, 81a vent 120 core body 120a, 120b core 191 base 192, 892 airtight plate 1500 diaphragm
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