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JPH09284894

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DESCRIPTION JPH09284894
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer for use in a small radio such as a cellular phone or a pager.
[0002]
2. Description of the Related Art A portable telephone is equipped with a sounding body for
outputting a ringing tone and a sounding body for outputting a push sound. The sounding body
for outputting a ringing tone is an acoustic of a narrow frequency band (for example, 2 KHz Since
an electrical signal is used, a magnetic speaker is used in the configuration, and a sound
generator outputting a push sound uses an acoustic (voice) electrical signal in a wide frequency
band (for example, 400 Hz to 5 KHz), Dynamic speakers are used in frequency characteristics.
[0003]
Also, in recent pagers, the DTMF signal (Ton Dialer signal) is used to make a call without sending
a dial or send a message. A dynamic speaker is used as a sound generator for this purpose.
[0004]
As widely known, a magnetic speaker includes a fixed coil, a pole tip, a magnet, and a diaphragm,
and supplies an acoustoelectric signal of a predetermined frequency band to the fixed coil to
vibrate the diaphragm. The sound is generated by this vibration.
03-05-2019
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[0005]
In addition, the dynamic speaker includes a movable coil, a pole tip, a magnet, and a diaphragm,
and the movable coil is supplied with an acoustic (voice) electrical signal of a predetermined
frequency band to vibrate the movable coil. The vibration of the coil causes the diaphragm to
vibrate to generate sound.
[0006]
The two speakers described above are configured as separate electroacoustic transducers, and
are incorporated in a cellular phone, a pager or the like.
[0007]
As described above, since two electroacoustic transducers comprising a coil, a pole tip, a magnet,
a diaphragm and the like are incorporated in a small wireless device, the space for the small
wireless device can be reduced. -Due to the high rate of ownership, the miniaturization of
compact radios has become a problem.
In addition, there is a problem that the production cost of the small radio becomes high by
providing two electroacoustic transducers.
[0008]
SUMMARY OF THE INVENTION The present invention was developed to solve the abovementioned problems. A movable coil fixed to a diaphragm is disposed in the magnetic field of a
magnet, and an acoustic frequency current is applied to the coil. The first sounding body unit
that causes the diaphragm to vibrate by flowing and the second sounding that causes the
diaphragm to vibrate by changing the magnetic force of the magnet by flowing an acoustic
frequency current through the fixed coil. The first and second sounding body units are provided
on the device case such that the central portions of the respective diaphragms are disposed on
the same axis, and one of the sounding body units is provided. The present invention proposes an
electro-acoustic transducer characterized in that a magnet is provided only in the second sound
generator unit and the other sound generator unit is operated using the magnetic force of the
magnet.
[0009]
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DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention
will be described with reference to the drawings.
FIG. 1 is a partially cutaway front view of the electro-acoustic transducer, FIG. 2 is an enlarged
cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a rear view of the same device.
[0010]
In these figures, 50 is a flat type device case whose front side is open, and this device case 50
has a ring-shaped portion 51 having first and second sounding bodies 61 and 68 described later,
and vibration. It consists of the plane part 52 which leads the vibration noise of a board to a
sound hole, and these are integrally formed with a synthetic resin material.
[0011]
The ring-shaped portion 51 has an inner hole 51a, and as shown in FIG. 1, a ring-shaped frame
body which is held by three connecting portions 53 which are projected into the inner hole 51a
from the middle of the inner surface. It has 54.
The frame 54 is concentric with the ring-shaped portion 51 and has a bottomless structure.
[0012]
The bottom of the ring-shaped portion 51 is open, and the bottom is covered with a frame 55
having a circular frame hole and a magnetic plate 56 fixed to the frame 55 so as to cover the
circular frame hole. It is
The above-mentioned frame 55 is formed of a magnetic material.
Further, in the device case 50, a lid 57 is fitted on the front side.
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[0013]
Furthermore, in the device case 50, a resonance chamber 58 is formed by the lid 57 and the ringshaped portion 51, and a communication chamber 59 communicating with the resonance
chamber 58 is formed by the lid 57 and the flat portion 52. The communication chamber 59
communicates with the sound hole 60 formed by the lid 57 and the flat portion 52.
[0014]
On the other hand, in the above-described device case 50, first and second sound producing unit
61, 68 are provided.
The first sound producing unit 61 is provided on the lower side of the frame 54 formed in the
ring-shaped portion 51, and a disk-shaped magnet 62 is fixed on the magnetic plate 56. A platelike pole piece 63 is fixed, and a movable coil 65 suspended from a diaphragm 64 is provided
around the outside of the pole piece 63.
[0015]
The diaphragm 64 has a disk shape and the outer peripheral portion thereof is fixed to the frame
55 with an adhesive or the like.
Further, the movable coil 65 described above is electrically connected to the feed terminals 66
and 67 provided on the back side of the frame 55.
[0016]
Furthermore, the frame 54 of the device case 50 is provided with a second sounding body unit
68.
The second sounding body unit 68 fixes a container 70 made of a magnetic material in which a
pole material 69 is integrally formed to project from the central portion to the frame 54, and the
pole material 69 is formed. The fixed coil 71 is provided around the circumference of the frame
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54 so that the disk-shaped diaphragm 72 made of a magnetic material is opposed to the tip end
face of the pole piece 69 with a slight gap. It is placed on the form 54a. Further, the frame 54 is
provided with projecting pieces 54c at circumferentially equidistant positions, and the diaphragm
72 is positioned by the projecting pieces 54c. Further, the diaphragm 72 is provided with a
weight plate 73 made of a metal plate, and the above-mentioned fixed coil 71 is electrically
connected to the feeding terminals 74 and 75 provided in the device case 50.
[0017]
The first sound producing unit 61 and the second sound producing unit 68 described above are
disposed in parallel, and are disposed such that the central portions of the respective diaphragms
64 and 72 are coaxially located. With this arrangement, the second sound producing unit 68
placed in the magnetic field of the magnet 62 provided in the first sound producing unit 61
exerts the magnetic force of the magnet 62 on the yoke 70. .
[0018]
Further, on the back surface of the frame 55, a braking filter 76 made of a synthetic resin
material is provided. This filter 76 is designed to prevent dust and water from entering, in
addition to enhancing the acoustic effect. The plurality of small holes formed in the frame 55 are
air holes.
[0019]
Next, the operation of the above-described electroacoustic transducer will be described. When
the first sound producing unit 61 supplies an acoustoelectric signal (sound frequency current) to
the movable coil 65, the magnetic path of the pole 63, the frame 55 made of a magnetic material,
the magnetic plate 56, and the magnet 62 The change in magnetic flux causes the movable coil
65 to vibrate in accordance with the frequency of the acoustoelectric signal described above, and
the vibration of the movable coil 65 causes the diaphragm 64 to vibrate.
[0020]
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The vibration noise of the diaphragm 64 enters a resonance chamber 58 formed on the upper
side of the diaphragm 64, resonates in the resonance chamber 58, and is emitted outward from
the sound hole 60 through the communication chamber 59. The first sounding unit 61 is
operated by a wide frequency band acoustoelectric signal of, for example, 400 Hz to 5 KHz, and
is used as a sounding unit that outputs a push sound, or a speaker speaker of a mobile phone or
the like. .
[0021]
The second sound producing unit 68 is formed of a pole 69, a diaphragm 72, a yoke 70, a frame
55, and the like by the magnetic force (or magnetic field) of the magnet 62 provided in the first
sound producing unit 61. A magnetic path is formed by the magnetic plate 56 and the magnet
62. When an acoustoelectric signal is supplied to the fixed coil 71, the pole tip 69 is excited to
change the magnetic flux of the magnetic path, and the diaphragm 72 The movement of the
diaphragm 72 is repeated in accordance with the frequency of the acoustoelectric signal to
generate a vibration sound by receiving a driving force which is drawn to the side of the lupus 69
and pushed to the opposite side.
[0022]
The vibration noise of the diaphragm 72 enters the resonance chamber 58 from the portions 54b
other than the respective convex portions 54a of the frame 54, resonates in the resonance
chamber 58, and then passes outward from the sound hole 60 through the communication
chamber 59. Released.
The second sounding body unit 68 can be operated by an acoustoelectric signal in a frequency
band of about 2 KHz to 4 KHz, for example, and can be used as a sounding body that outputs a
ringing tone.
[0023]
In the embodiment described above, the first sound producing unit 61 is provided with the
magnet 62, and the second sound producing unit 68 utilizes the magnetic force of the magnet
62. The body unit 68 may be provided with a magnet, and the first sound producing unit 61 may
be configured to use the magnetic force of the magnet.
[0024]
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As described above, the electro-acoustic transducer configured as described above is configured
so as to house two different sounding body units in one device case and share the magnet
constituting the magnetic path. In addition to becoming a small electro-acoustic transducer, the
number of parts is reduced and the device becomes flat enough because one device case is
required and the magnet of the other sound generator unit becomes unnecessary. The cost is also
reduced, resulting in an electro-acoustic transducer suitable for small radios.
In addition, since two sound producing units can share sound holes, the degree of freedom in
device design is increased.
[0025]
Brief description of the drawings
[0026]
1 is a partially cutaway front view of an electro-acoustic transducer showing an embodiment of
the present invention.
[0027]
2 is an enlarged cross-sectional view taken along line AA of FIG.
[0028]
3 is a rear view of the same device.
[0029]
Explanation of sign
[0030]
50 device case 61 first sound producing unit 62 magnet 63 pole 64 vibrating plate 65 movable
coil 68 second sound producing unit 69 pole 70 70 yoke 71 fixed coil 72 vibrating plate
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