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JP2003274475

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DESCRIPTION JP2003274475
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
configuration of a speaker and an imaging device forming a multi-functional acoustic device used
in a portable device, and in particular, to a speaker or a speaker during reception from the
speaker. The present invention relates to an overall configuration of a multi-functional micro
speaker integrated with a speaker capable of capturing an image of the scene.
[0002]
2. Description of the Related Art Various attempts have been made to reduce the size, weight and
cost of portable devices. As an example thereof, there can be mentioned a multifunctional
acoustic device in which an acoustic device and a vibrating body or an acoustic device and a
vibration motor are integrated. The purpose of this technology is to allow a user of a portable
device to sense an incoming call in a manner mode and to obtain normal reception selectively or
simultaneously. In this case, a part of the permanent magnet for the speaker or another
additional permanent magnet is often used for the above-mentioned vibrator or vibration motor.
Here, Japanese Patent Application No. 2000-286414 (Document A), which is a multi-functional
acoustic device according to the prior art by the same applicant as the present application, will
be described. The basic configuration of the image pickup apparatus itself is known, for example,
by Sho 62-254579 (Document B) whether the image pickup element is a CCD element or a CMOS element. The cited documents A and B will be described in detail below.
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[0003]
The multifunctional acoustic device of document A shown in FIG. 2 is composed of a sound
generator 100, a rotor 200 and a stator 300. A rotor shaft 106 having a diameter enlarged
portion 106a of a rotor shaft fixed to the central portion of a cup-shaped frame 111 formed of
resin or the like for preventing the rotor from jumping upward due to vibration or the like is
fixed In the sound producing body 100, a concentric cylindrical voice coil 102 operable in a
speaker gap 103 described later is fixed to a speaker diaphragm 101 having a dome 101a at a
central portion formed of synthetic resin. The portion 101 b is configured to be fixed to the
frame 111 with an adhesive or the like. The outer periphery of an acoustic cover 110 having a
plurality of sound output holes is fixed to the outer end of the frame 111 on the upper surface of
the speaker diaphragm 101. The rotor 200 is mechanically engaged with the rotor shaft 106 and
rotatable via the washer 107. A magnetic material is mounted on the speaker magnet 105 in
which single magnetic poles are magnetized on the upper and lower surfaces in the thickness
direction. The top yoke outer peripheral portion 104a of the cylindrical top yoke 104 forms the
inner peripheral portion of the speaker gap 103 engaged with the voice coil 102, and the central
portion of the hollow disk-shaped lower yoke 108 made of a magnetic material A cylindrical side
yoke 109 made of a magnetic material is fixed to the outer periphery of the hollow disk-shaped
lower yoke 108 so as to face the outer periphery 104 a of the top yoke 104 via the speaker gap
103. A rotor permanent magnet 201 in which the outer peripheral side surface is multipolarmagnetized is provided on the outer peripheral portion of the yoke 109.
[0004]
The permanent magnet mounted on the rotor 200 is the speaker magnet 105 and the rotor
permanent magnet 201, and there are two magnetic circuits, one of which is the speaker magnet
105, the outer peripheral portion 104a of the top yoke 104, the speaker gap 103 , And side
yokes 109. In another magnetic circuit, the magnetic flux produced by the multipole-magnetized
magnetic pole is formed on the outer peripheral surface of the rotor permanent magnet 201 via
a motor gap 203 between the side surface yoke 109 and a stator magnetic pole described later.
Ru. The material of the rotor permanent magnet 201 may be selected in accordance with
required specifications such as bond ferrite and bond NdFeB. Further, although the number of
poles is eight in the embodiment, it may be two or more, and the magnetic pole width may be an
appropriate value in design. In order to increase vibrational vibration due to the centrifugal force
generated when the rotor 200 rotates, the upper surface of the rotor permanent magnet 201 is
formed of a material having a large specific gravity in a semicircular shape, for example, a resin
filled with tungsten fine powder. Secure the weight. Further, the speaker magnet 105 and the
rotor permanent magnet 201 may be slightly eccentrically fixed.
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[0005]
The stator 300 facing the rotor 200 through the motor gap 203 includes a plurality of stator
windings 306 wound concentrically in a cylindrical shape, a pair of upper stator yokes 301, a
lower stator yoke 303, and a pair of stator windings. It is constituted so that it may be
surrounded by the upper cover plate 302 and the lower cover plate 304. A disk-shaped upper
stator yoke 301 made of a magnetic material has four main magnetic poles bent in a sawtooth
shape and a total of eight magnetic poles of four auxiliary magnetic poles with respect to the
inner peripheral portion of the stator. The disk-shaped lower stator yoke 303 made of a material
has four main magnetic poles bent in a sawtooth shape and four auxiliary magnetic poles in total,
eight in total, with respect to the inner peripheral portion of the stator. Adjacent one magnetic
pole pitches are arranged at 90 ° mechanical angle (360 ° electrical angle) intervals. The total
of the main pole width and the complementary pole width is within 45 ° in mechanical angle,
and the main pole width is formed wider than the complementary pole width.
[0006]
The operation will now be described. First, when a wide band so-called high frequency signal
alone is applied to the voice coil input terminals 112a and 112b, a force acts on the voice coil
102 in the speaker gap 103 in the Y direction, and the speaker diaphragm 101 of the sounding
body 100 Vibrates in the Y direction to generate sound pressure, and emits a sound wave
through the sound emission hole of the sound cover 110.
[0007]
A low frequency signal of about 100 to 300 Hz is applied to the input terminals 305a and 305b
of the stator winding 306 to generate a rotating magnetic field and generate a rotational force in
a fixed direction to the rotor 200 to apply vibrational vibration force. be able to. Therefore, in the
example of document A, it is shown that one or both of the sound reception by the speaker and
the manner mode by the vibrational excitation force can be sensed.
[0008]
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Further, according to Document B, the solid-state imaging device is provided with a transparent
substrate made of a glass substrate or a quartz plate adhesively fixed on the light receiving
surface of the solid-state imaging element chip held by the chip carrier. The optical system and
the solid-state imaging device chip, which are housed in the outer case, are aligned with each
other as an optical reference. Thus, although the configuration of the imaging device is disclosed,
no mention is made of an integrated multifunctional acoustic device.
[0009]
SUMMARY OF THE INVENTION As is apparent from the above description, the conventional
multifunctional acoustic device selectively or simultaneously senses either the function of sound
reception or manner mode associated with sound. In order to improve space efficiency mainly,
the In addition, although a product in which a speaker and an imaging device are separately
mounted is announced in a recently commercialized mobile device, it is not an acoustic device
integrated with a speaker related to transmission and reception of an image of the mobile device.
Therefore, even if there are portable devices in which the speaker and the imaging device are
separately mounted, there is no multi-functional acoustic device that integrates them, and the
space efficiency of the portable device can not be improved.
[0010]
SUMMARY OF THE INVENTION The object of the present invention is to realize a multifunctional
microspeaker with a simple structure by removing defects in the eyelid, and in particular, an
imaging device is disposed in the central portion of the loudspeaker It is characterized in that it
was configured. Claim 1 of the multifunctional micro speaker according to the present invention
made to solve the problem comprises a concentric cylindrical voice coil fixed to a speaker
diaphragm and a magnetic circuit magnetically engaged with the voice coil. The acoustic device
is characterized in that a solid-state imaging device is disposed in the center of the speaker
forming the magnetic circuit so as to face the diaphragm of the speaker.
[0011]
A second aspect of the present invention is a multi-function micro speaker according to the
present invention, which comprises a concentric cylindrical voice coil fixed to a speaker
diaphragm and a magnetic circuit magnetically engaged with the voice coil. In an acoustic device,
the voice coil is magnetized on a single magnetic pole in a thickness direction magnetically
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engaged with the voice coil, and the voice coil has an outer peripheral portion on the upper
surface of a hollow disk-like speaker magnet disposed on the outer peripheral portion A diskshaped outer peripheral yoke made of a magnetic material to form an air gap magnetically
engaged with the magnetic field, and a magnetic path is formed via the air gap on the lower
surface of the speaker magnet so as to magnetically engage the voice coil. A hollow cup-shaped
yoke made of a magnetic material to be formed is fixed, and an outer case of a solid-state
imaging device is disposed along the inner peripheral side surface portion of the cup-shaped
yoke.
[0012]
In addition, according to claim 3 of the multifunctional micro speaker of the present invention
made to solve the problem, the central portion of the diaphragm of the multifunctional micro
speaker functions as an optical filter.
[0013]
Further, according to claim 4 of the multifunctional micro speaker of the present invention made
to solve the problem, the imaging device of the multifunctional micro speaker mounts an optical
system element on the inner peripheral side surface of the outer case, It is characterized in that
the optical element and the image pickup element mounted on the circuit board are overlapped.
[0014]
Still further, according to claim 5 of the multifunctional micro speaker of the present invention
made to solve the problem, the protector of the multifunctional micro speaker is that the surface
of a metal material is surface-treated with a material having high reflectance. It is characterized
by
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described below with reference to the drawings.
FIG. 1 is a cross-sectional view of an essential part of an embodiment of a multifunctional micro
speaker according to the present invention.
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[0016]
In FIG. 1, the multifunctional micro speaker according to the present invention is composed of a
micro speaker 10 and a solid-state imaging device 30.
The microspeaker 10 housed in the cup-shaped frame 14 formed of resin or the like has a
concentric cylindrical shape that can operate within the speaker gap 13 described later in the
speaker diaphragm 11 having the dome 11 a at the center part formed of synthetic resin The
voice coil 12 is fixed, and the outer peripheral portion 11 b of the speaker diaphragm 11 is fixed
to the frame 14 with an adhesive or the like.
The outer periphery of a protector 15 having a plurality of sound output holes is fixed to the
outer end of the frame 14 on the upper surface of the speaker diaphragm 11.
The speaker gap 13 magnetically engaged with the voice coil 12 is the top yoke inner peripheral
portion 16a of the top yoke 16 holding the upper and lower surfaces of the hollow disk-shaped
speaker magnet 18 magnetized in a single magnetic pole in the axial direction. And the outer
peripheral portion 17a of the hollow cup-shaped speaker 18 of the speaker.
[0017]
The outer case 31 of the imaging device 30 is held and fixed to the side surface of the inner
peripheral portion 17 b of the speaker yoke 17 as viewed from the speaker center 21. The
imaging element chip 32 mounted on the circuit board 34 is fixed to the bottom of the frame 14
through the circuit board 34 and is laminated so that the optical axis is orthogonal to the optical
system 33 fixed to the outer case 31. Since light from the outside enters the imaging device 30
via the speaker diaphragm 11, the central portion of the dome 11a of the speaker diaphragm 11
should be as flat as possible. Although the speaker yoke 17 and the outer case 31 are separately
provided in the description of the embodiment, it is apparent that they may be integrally formed.
Then, the optical system 33 may be provided with a diaphragm device or a filter, and the
diaphragm mechanism may be disposed at the center of the protector 15.
[0018]
When a signal is applied to the input terminals 19 and 20, the speaker diaphragm 11 vibrates in
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the Y direction to generate a sound pressure, and at the same time, the imaging device 30 can
receive external light and capture an image.
[0019]
According to the multifunctional microspeaker of the present invention, since the functions of the
speaker and the imaging device can be combined with a simple configuration, it is possible to
contribute to the miniaturization and multifunctionalization of the portable device to be mounted.
it is obvious.
[0020]
According to the present invention, the multifunctional microspeaker capable of generating
sound and imaging can not only be miniaturized and thinned, but also the cost / performance can
be improved because of the simple configuration, and the practical effect is remarkable.
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