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JPH11252683

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DESCRIPTION JPH11252683
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electric / acoustic transducer that can be applied to the sound generator of a mobile phone,
headphones and the like.
[0002]
2. Description of the Related Art In an electric / acoustic transducer such as a speaker which
receives an audio current and converts it into mechanical vibration to generate sound, it is
required to be as small as possible according to the application. The mobile phone is provided
with a sounder that generates a ringing tone, and a speaker that reproduces the voice of the
other during a call, but these are also targets. On the other hand, in a headphone for enjoying
music etc. by one person, a speaker is housed in a housing applied to the ear, but even with this
headphone, it is better to be small if it has the same performance. Needless to say.
[0003]
As described above, the mobile phone is provided with a sounder and a speaker, and the ringing
tone is used as the sounder and the voice of the other party is used as the speaker. For this
reason, in the increasingly smaller mobile phones, these have become parts to be considered in
the request for reducing the required volume. However, in response to this request,
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1
conventionally, it has been merely an effort to miniaturize parts, so there has been a limit in its
miniaturization at this part.
[0004]
SUMMARY OF THE INVENTION The present invention has been made in view of this point, and
by combining the sounder and the speaker as one component, the size of these components can
be reduced without losing their functions. It is intended to provide an electrical and acoustic
transducer.
[0005]
According to the present invention, as means for solving the above-mentioned problems, in the
invention described in claim 1, a magnetic circuit comprising a magnet, a yoke, and a pole piece,
and a voice coil. In the electric / acoustic transducer in which the diaphragm is driven by the
action of (1), two magnetic plates are driven by one magnetic circuit.
[0006]
In the invention described in claim 2, in the invention described in claim 1, two magnetic gaps
are formed on the outer peripheral side and the inner peripheral side of the ring-shaped magnet,
and the two magnetic gaps are respectively formed. A voice coil attached to a diaphragm is
disposed.
[0007]
Furthermore, in the invention described in claim 3, the pole piece for pressing the upper portion
of the magnet is formed in a T-shaped cross section, and the first magnetic gap is formed
between the outer peripheral portion of the pole piece and the yoke located on the outer
periphery. A voice coil attached to a diaphragm is disposed to constitute a dynamic type
conversion mechanism, and a coil is wound around a central shaft of the pole piece having a Tshaped cross section and a magnetic body is provided at the front thereof A magnetic type
conversion mechanism is configured by making the magnetic body portion of the diaphragm 2
face.
[0008]
As described above, according to the invention described in claim 1 in which two diaphragms are
driven by one magnetic circuit, the function as a sounder and the speaker can be achieved by
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2
properly using the signal inputted to the voice coil. Can serve as a
In the second aspect of the invention, the ring-shaped magnet and the yoke can form two
speakers of the external magnet type and the internal magnet type. Therefore, if the size of the
diaphragm is changed, It functions as a 2 way speaker.
Furthermore, in the invention described in claim 3, the dynamic conversion mechanism operates
as a speaker, and the magnetic conversion mechanism operates as a sounder.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present
invention will be described below with reference to FIG.
This electric-acoustic transducer 1 has a ring-shaped magnet 4 placed on a frame (yoke) 3 having
a hole 2 in the recess in the shape in which the center is recessed and a pole piece in which the
upper part is recessed The structure is held down by 5.
The voice coil 8 attached to the first diaphragm 7 is disposed in the first magnetic gap 6 formed
between the rising portion of the frame 3 and the outer peripheral portion of the pole piece 5,
and the hole of the frame 3 is formed. A voice coil 11 attached to a second diaphragm 10 is
disposed in a second magnetic gap 9 formed between the second and the central portion of the
yoke 5. The frame 3 is fitted in the hole 13 of the printed circuit board 12.
[0010]
In this structure, the magnet 4 is positioned inside the voice coil 8 disposed in the first magnetic
gap 6, so that it becomes an internal magnet type electric-acoustic transducer and disposed in
the second magnetic gap 9. Since the magnet 4 is located on the outside of the voice coil 11, an
external-magnet-type electroacoustic transducer is formed. Provided at the front of the second
diaphragm 10 is a protector 14.
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[0011]
The electric / acoustic converter 1 is configured such that a voice current is flowed through the
voice coils 8 and 11 so that the magnetic interference between the magnetic circuit including the
magnet 4 and the frame 3 and the pole piece 5 and the voice coils 8 and 11 , And the second
diaphragms 7 and 10 vibrate to generate sound. When used in a mobile phone, the first
diaphragm 7 is used as a sounder, and the second diaphragm 10 is functioned as a speaker.
When incorporated into equipment, the lower part in the figure is used as the front, but holes 15,
16, 17 are provided in frame 3, pole piece 5 and printed circuit board 12 so as not to interfere
with the movement of sound waves. ing.
[0012]
Although the one shown in FIG. 1 is intended for use in a mobile phone, the overall outer
diameter is about 20 mm, but another example of the embodiment of the present invention
shown in FIG. Then, in order to use for headphones, the whole outside diameter size is about 56
mm. The structure in this case is basically the same as that of FIG. 1, and therefore the same
reference numerals are given to the same parts to simplify the explanation, but the difference
from that of FIG. 1 is the first diaphragm The rear cover 18 is provided at the rear of 7 (the lower
side in the figure is the front when used), the magnet 4 is supported by the yoke 19 without
being supported by the frame 3, and the center of the pole piece 5 The elimination of the hole 16
and the provision of the front cover 20 having a shape that is easy to conform to the user's ear
instead of the protector 14.
[0013]
In this structure, the outer peripheral portion of the second diaphragm 10 is attached to the front
cover 20. The rear cover 18 and the front cover 20 are provided with holes 21 and 22 for air
flow so that the vibration of the first and second diaphragms 7 and 10 can be performed without
any problem. In order to release the back pressure of the plate 10, small holes 23 are provided
radially in the front cover 20, as shown in FIG.
[0014]
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4
What is shown in FIG. 4 is still another example of the embodiment of the present invention.
Although the two examples described so far are all combinations of two dynamic conversion
mechanisms, in this embodiment, both the dynamic and magnetic functions are provided by the
structure to be described next. Can be
[0015]
Where this embodiment is largely different from the previous two, the pole piece 5A which holds
the upper part of the magnet 4 is formed in a T-shaped cross section in order to make a part be a
magnetic type conversion mechanism. It is a point. Then, it is attached to the first diaphragm 7 in
the magnetic gap 9A (corresponding to the second magnetic gap 9 in FIG. 1 and FIG. 2) between
the outer peripheral portion of the pole piece 5A and the yoke 19 located on the outer periphery.
The voice coil 8 is disposed to constitute a dynamic type conversion mechanism.
[0016]
In addition, coil 24 is wound around the central shaft of pole piece 5A having a T-shaped cross
section, and a portion of iron plate 25 of second diaphragm 26 to which iron plate 25 as a
magnetic body is attached is exposed at the front. Constitute a magnetic type conversion
mechanism. The second diaphragm 26 in this structure is a flat metal plate, while the first and
second diaphragms 7 and 10 described above are thin plastic films having a mountain-shaped
cross section. The outer peripheral portion of the second diaphragm 26 is supported by a resin
mold 27, and the outer side (lower side) is covered with a cover 29 provided with a hole 28 at its
center.
[0017]
In this embodiment, the vibration action of the first diaphragm 7 is performed as a dynamic type
as before, but the second diaphragm 26 is wound around the central shaft of the pole piece 5A.
The iron plate 25 reacts to a change in the magnetic field of the shaft portion by the coil 24 to
vibrate as a magnetic type. Since the sound generated is high in the sound of the second
diaphragm 26, when used in a mobile phone, this is used as a sounder, and the first diaphragm 7
is used as a speaker.
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[0018]
The present invention is an electro-acoustic transducer configured as described above, and it is
possible to drive two diaphragms with one magnetic circuit, so claim 1 and claim In either case
described in 2, it is possible to reduce the overall size without losing the function. Therefore, for
a mobile phone that is required to be downsized, or for headphones that are required to be
downsized with the same performance, a great effect is achieved. In addition, in addition to the
effect of volume reduction, since the conversion mechanism of both the dynamic type and the
magnetic type which can not be considered conventionally can be accommodated in one housing
according to the third aspect of the invention, It will also be possible to achieve cost reduction
effects.
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