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JP2000201396

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DESCRIPTION JP2000201396
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer for a portable telephone used in a portable telephone, and more
particularly to an electroacoustic transducer for an electrodynamic type portable telephone
having functions of vibration, ringing tone and voice.
[0002]
2. Description of the Related Art FIG. 3 is an external perspective view of a portable telephone
using an electroacoustic transducer for portable telephone. In the figure, 10 is a mobile phone,
11 is a liquid crystal display unit, and 12 is a receiver. The portable telephone 10 is being made
extremely compact and lightweight. On the other hand, in order to increase display information,
the liquid crystal display unit 11 has become wide, and the proportion of the mobile phone 10
has become high. Therefore, the portion in which the receiver 12 of the mobile phone 10 is
inserted is getting smaller and smaller. As apparent from the figure, in particular, the length in
the vertical direction is very strict relative to the length in the horizontal direction. Also, recently,
a system has been adopted in which each function of a speaker for voice, a vibrator for vibration,
and a buzzer for ringing tone are performed by one actuator.
[0003]
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1
As described above, the miniaturization and weight reduction of the portable telephone 10 and
the enlargement of the liquid crystal display unit 11 are in progress. Naturally, the space for
housing the receiver 12 on the liquid crystal screen is greatly restricted. Along with this, the
receiver 12 has the functions of a speaker for voice, a vibrator for vibration, and a buzzer for
ringing tone, so that the vibrator and the buzzer are omitted, and further downsizing and weight
reduction of the receiver 12 itself are required. Have the problem of
[0004]
The present invention has been made in view of these points, and has the functions of a speaker
for voice, a vibrator for vibration, and a buzzer for ringing tone without sacrificing sound quality
and output, and has a space factor. To provide an electro-acoustic transducer for an
electrodynamic type mobile phone.
[0005]
SUMMARY OF THE INVENTION As the size and weight of the portable telephone and the size of
the liquid crystal display screen are increased, the space occupied by the electroacoustic
transducer for the portable telephone is inevitably reduced.
In order to improve space factor without sacrificing sound quality and output, the magnetic
circuit is floated so that vibrators for vibration and buzzers for ringing can be omitted. In
addition, by changing the shape from a circle to a track, sufficient output and sound quality can
be obtained while coping with space saving.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION In order to solve the above-mentioned
problems, the electroacoustic transducer for a portable telephone according to the present
invention is an electroacoustic type electroacoustic transducer for use in a portable telephone
having a function of vibration, ringing tone and voice. In the converter, the magnetic circuit is
composed of a track type magnet 9, a track type pole piece 7, a track type yoke 6, etc., and the
movable part is composed of a track type voice coil 8 and a track type diaphragm 2 etc. The
present invention is characterized in that a suspension 4 for supporting the magnetic circuit and
the movable portion is provided, and outer peripheries of the track type diaphragm 2 and the
suspension 4 are fixed to the case 3.
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2
[0007]
Further, in the electro-acoustic transducer for a portable telephone according to the present
invention, the suspension 4 is a plate-like spring material, and the shape thereof is a track 4a of a
constant width consisting of a track type outer periphery and a track type inner periphery. The
track 4a is characterized by being provided with two piercing lines 4b and 4c of three quarters of
a turn.
[0008]
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 (a) is a partial plan view of an electroacoustic transducer for a cellular phone according to
an embodiment of the present invention, and FIG. 1 (b) is a side sectional view.
In the figure, 1 is an electroacoustic transducer for a mobile phone according to the present
invention, 2 is a track type diaphragm, 3 is a track type case, 4 is a track type suspension, 5 is a
terminal board, 6 is a track type yoke Reference numeral 7 denotes a track type pole piece, 8
denotes a track type voice coil, and 9 denotes a track type magnet. The track type in the
embodiment of the present application is a so-called capsule type, which is a so-called capsule
type, and both sides are in the shape of a semicircle.
[0009]
The magnetic circuit has a track-like shape including a magnet 9, a pole piece 7, a yoke 6 and the
like. Further, the movable portion is a track type shape configured of the voice coil 8 and the
diaphragm 2 and the like. The magnetic circuit and the movable portion are supported by the
suspension 4, and the outer periphery of the diaphragm 2 and the suspension 4 is fixed to the
case 3. That is, the electroacoustic transducer 1 for mobile phones is not a usual circle but a
track shape.
[0010]
The portion in which the receiver 12 of the mobile phone 10 is contained, in particular, the
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3
length in the vertical direction is very strict relative to the length in the horizontal direction. For
this reason, as the electroacoustic transducer 1 for portable telephones, one having a smaller
diameter is required. However, if the diameter is simply reduced in the conventional circular
shape, the magnetic flux density can not be sufficiently obtained, and the length of the coil
becomes short. Therefore, a sufficient output can be obtained while dealing with space saving as
the track shape (magnetic circuit: magnet 9, pole piece 7, yoke 6 and movable part: diaphragm 2,
voice coil 8) of the electroacoustic transducer 1 for mobile phone To be able to That is, even if
the width of the track type is made narrower than the diameter of the conventional circular
shape, the magnetic flux is longer than that of the conventional circular shape by extending the
longitudinal direction so that the cross-sectional area is equal to or larger than the area of the
circle. The density can be increased. In the limited space factor, the magnetic flux density can be
obtained, and in order to give vibration, it is limited to a certain extent in the round shape, so by
making it a magnetic circuit and moving part in the form of a track, It has put out the
performance.
[0011]
In the electro-acoustic transducer 1 for a portable telephone, when an electric signal is applied to
the voice coil 8, an action / reaction force acts between the voice coil 8 and the magnetic circuit.
The diaphragm 2 connected to the voice coil 8 vibrates due to the force acting on the voice coil
8. The magnetic circuit supported by the suspension 4 vibrates due to the reaction force acting
on the magnetic circuit, and this vibration is transmitted to the case 3 via the suspension 4 and
vibrates. When the frequency of the electrical signal applied to the voice coil 8 coincides with the
resonance frequency of the mechanical vibration system, the vibration of the case 3 becomes the
largest. The resonant frequency is about 80 to 130 Hz.
[0012]
Further, when an electrical signal for ringing tone is applied to the voice coil 8, the ringing tone
is emitted from the diaphragm 2. It also functions as a vibrator when an electrical signal for
vibration of 80 to 130 Hz is applied. Furthermore, when a received signal at a frequency of 300
to 3 kHz is applied, it acts as a receiver. That is, the electroacoustic transducer 1 for mobile
telephones has functions of a speaker for voice, a vibrator for vibration, and a buzzer for ringing
tone.
[0013]
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4
FIG. 2 is a plan view of a suspension of the electroacoustic transducer for a mobile phone in an
embodiment of the present invention. In the figure, 4a is a track, 4b is a cutting line, 4c is a
cutting line, 4bs is a starting end of cutting line 4b, 4be is a cutting end of cutting line 4b, 4cs is
a starting end of cutting line 4c, 4ce is a cutting The end of the line 4c, O is the center point of
the suspension 4, x is the center line of the suspension 4 in the vertical direction, and y is the
center line of the suspension 4 in the left and right direction.
[0014]
The hatched portion is a plate-like spring material, and its shape is a track 4a of a fixed width
consisting of a track-type outer periphery and a track-type inner periphery. The track 4 a is
provided with two cut lines 4 b and 4 c of three quarters of a turn, and these cut lines 4 b and 4 c
are point symmetrical with respect to the center point O of the suspension 4. That is, the start
end 4bs of the cut line 4b and the start end 4cs of the cut line 4c are symmetrical with respect to
the vertical center line x of the suspension 4, and the end 4be of the cut line 4b and the end 4ce
of the cut line 4c are suspension It is line symmetry of the center line y of the left-right direction
of 4. FIG. The arm between the start 4b of the score 4b and the end 4ce of the score 4c and the
arm between the start 4cs of the score 4c and the end 4be of the score 4b act as a spring.
[0015]
As described above, the electroacoustic transducer for mobile telephone according to the present
invention comprises the magnetic circuit comprising the track type magnet 9, the track type pole
piece 7, the track type yoke 6, etc. Is composed of a track type voice coil 8 and a track type
diaphragm 2 etc., and the suspension 4 for supporting the magnetic circuit and the movable
portion is provided. The outer periphery of the track type diaphragm 2 and the suspension 4 is
In the electroacoustic transducer for a mobile phone according to the present invention, the
suspension 4 is a plate-like spring material, and the shape thereof is a track 4a having a constant
width consisting of a track-type outer periphery and a track-type inner periphery. Since the track
4a is provided with two piercing lines 4b and 4c of three quarters of a quarter, the speaker for
audio is used without sacrificing sound quality and output. Vibrator for vibrating has the
functions of the buzzer for call sound, it is possible to provide an electro-acoustic transducer for
a portable phone with excellent electrokinetic form the space factor.
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