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JPH06113395

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH06113395
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer for converting an input electrical signal into sound.
[0002]
2. Description of the Related Art Conventionally, as shown in FIGS. 6 and 7, an electromagnetic
type electroacoustic transducer is provided with a cylindrical outer case 2 molded of a synthetic
resin. On the part side, a base part 4 is installed. The base 4 is a closing means for closing the
opening of the outer case 2 and serves as a support member of the magnetic drive unit 5 and
includes the iron core 6, the base 8, the substrate 10, the terminals 12, It is comprised by five
types of seven parts of 14 and clamping pins 16 and 18. That is, the substrate 10 and the base 8
are fixed by caulking the rear portion of the iron core 6. The base portion 4 has a double
structure with a substrate 10 and a base 8, and the terminals 12 and 14 are fixed to the
substrate 10 with caulking pins 16 and 18.
[0003]
The iron core 6 constitutes a part of the magnetic drive unit 5, around which a coil 20 is wound,
and the lead portions 22 and 24 thereof are individually connected to the terminals 12 and 14.
An annular magnet 26 fixed to the base 8 is installed around the coil 20.
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[0004]
Further, in this electro-acoustic transducer, the stepped portion 27 is provided inside the exterior
case 2 to make the front side smaller in diameter and the rear side larger in diameter, and as a
support member between the stepped portion 27 and the base 8. A spacing ring 28 is provided.
A diaphragm 30 for converting magnetic vibration into mechanical vibration is installed on a
receiving surface formed on the inner peripheral portion of the space retaining ring 28. The
diaphragm 30 is disposed between the end face of the iron core 6 and a gap 32 for allowing
mechanical vibration. A magnetic piece 34 is fixed to the diaphragm 30, and a resonance space
36 for generating resonance vibration is provided inside the exterior case 2 on the front side.
Then, on the front side of the outer case 2, a sound output hole 38 having a cylindrical shape for
opening the resonance space 36 to the outside air is formed.
[0005]
Therefore, in such an electroacoustic transducer, when an electric signal of an appropriate level
is applied to the terminals 12 and 14, the coil 20 is excited by the electric signal, and the
excitation causes the diaphragm 30 to move up and down in the drawing. Vibrate. The vibration
of the diaphragm 30 depends on the amplitude and frequency of the applied electrical signal. As
a result, the sound generated by the vibration of the diaphragm 30 is released from the sound
emission hole 38 to the outside air while accompanied by the resonance vibration by the
resonance space 36. In this case, the base portion 4 also functions to maintain airtightness from
the back side of the diaphragm 30, and contributes to constant acoustic characteristics in
generating sound.
[0006]
By the way, in such an electro-acoustic transducer, the ratio of the base portion 4 in the exterior
case 2 is extremely large, which is a cause of impeding the reduction in size and weight. In the
past, shortening of the iron core 6 has been carried out for downsizing and weight reduction, but
such a method affects the number of turns of the coil 20 and the winding form thereof, and
flattens the electroacoustic transducer. However, there is a disadvantage that the generated
magnetic field is reduced, that is, the magnetic driving force is reduced and the sound pressure is
reduced.
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[0007]
In addition, reducing the size of the resonance space 36 occupying a large volume in the outer
case 2 is effective in reducing the size of the electroacoustic transducer. The resonance space 36
plays an important resonance effect in generating sound. Therefore, the narrowing causes
deterioration of the resonance effect, which adversely affects the acoustic characteristics much
more than the reduction of the magnetic driving force, and is not good.
[0008]
The iron core 6 is made to penetrate through the base 8 and the substrate 10 and crimp the rear
end thereof to stand. That is, in this electroacoustic transducer, the fixing means which integrates
the base 8 and the substrate 10 is formed, and the base 8 is configured by a separate member.
Moreover, in order to fulfill the function as such fixing means, the stepped portion 11 is provided
in the middle portion and the rear end portion side is made the small diameter portion 13, and
the small diameter portion 13 is used for caulking, the base 8 and the substrate The thickness
which added 10 and the length which added the caulking length are required.
[0009]
For this reason, the use of the iron core 6 has the following disadvantages. First, since the base 8
and the substrate 10 are fixed means, the iron core 6 is long, and caulking processing is required,
and the processing cost is high. Secondly, since the iron core 6 is a separate member, the number
of parts is increased accordingly. Third, a caulking head is formed at the rear end of the iron core
6 by caulking, and in an electroacoustic transducer having a major axis of 10 mm and a height of
about 8 mm, the proportion thereof is large, which is also electroacoustic It causes the loss of
miniaturization of the converter. For example, in order to cover this head, it is necessary to
enlarge the exterior case 2. Fourth, the base 8 together with the iron core 6 is formed of a
ferromagnetic material and forms a part of the magnetic circuit of the magnetic drive unit 5, but
in the case where the iron core 6 and the base 8 are mechanically coupled The effect of the
junction is to affect the magnetic properties and thus the acoustic properties.
[0010]
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Therefore, an object of the present invention is to provide an electroacoustic transducer in which
an iron core, which is a separate member, is formed of a base member and simplification is
achieved by hybridization of the base portion.
[0011]
SUMMARY OF THE INVENTION An electroacoustic transducer according to the present
invention, as illustrated in FIGS. 1 and 2, together with a diaphragm (30) vibrates the diaphragm
magnetically in response to an electric signal. An electro-acoustic transducer in which a magnetic
drive unit (5) is built in an outer case (2), which is made of a magnetic material, and an iron core
(60) is integrally formed on one side by molding thereof A base member (metal base substrate
40) for closing the opening of the outer case, and a coil (20) formed on the insulating film (48)
formed on the other surface side of the base member and wound around the core portion And
terminal patterns (conductive patterns 50, 52) to be connected to the lead portions (22, 24).
[0012]
In the electro-acoustic transducer of the present invention, the base member is formed of a
magnetic material, the core is integrally formed on one side of the base member by molding, and
the insulating coating is formed on the other side, A terminal pattern is formed on the top.
A coil is wound around the core portion to provide a necessary structure for the magnetic drive
portion.
The lead portion of the coil is connected to the conductive pattern of the base member, and is
drawn out. With such a configuration, the base member can be integrated with the integration of
the iron core portion, and the magnetic characteristics can be improved by the flattening of the
electroacoustic transducer and the integration with the iron core portion together with the
reduction of the number of parts. The
[0013]
And, such simplification of the base member contributes to the effect of suppressing unnecessary
vibration and also contributes to the improvement of acoustic characteristics.
[0014]
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The invention will now be described in detail with reference to the embodiments shown in the
drawings.
[0015]
1 and 2 show an embodiment of the electroacoustic transducer of the present invention.
In this electroacoustic transducer, a single metal base substrate 40 is used as a plate-like base
member formed of a magnetic material on the base portion 4.
The metal base substrate 40 is formed by forming a closed portion 42 which closes an opening
on the back side of the outer case 2 and a terminal portion 44 which is partially extended in the
diameter direction. Then, in the terminal portion 44, a bent portion 46 bent in an L shape is
formed on the side of the exterior case 2.
[0016]
The closed portion 42 has a circular shape corresponding to the opening shape of the outer case
4, and a core portion 60 having a cylindrical shape is formed by molding on one surface side of
the central portion thereof. That is, the iron core portion 60 is drawn at the center of the closed
portion 42 of the metal base substrate 40 to form a rod shape similar to that of a conventional
iron core.
[0017]
An insulating film 48 is formed on the outer surface of the closed portion 42 and the terminal
portion 44 of the metal base substrate 40 by printing or application of an insulating paste or the
like. Furthermore, on the surface of the insulating film 48, conductive patterns 50, 52 are formed
as a plurality of terminal patterns by conductor forming means such as printing, plating or the
like selectively using the insulating film 48 as an insulating means. . The conductive patterns 50
and 52 may be used for mounting circuits and elements attached to the electroacoustic
transducer in order to miniaturize and simplify the electronic device, and do not have to be
simple leads.
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[0018]
In the case of this embodiment, the closed portion 42 is a through hole 54 for drawing out the
lead portions 22 and 24 of the coil 20 of the magnetic drive unit 5 incorporated in the outer case
2 at a position slightly separated from the central portion thereof. , 56 are formed. The through
holes 54 and 56 are formed by punching or the like on a magnetic plate as a material before the
metal base substrate 40 is joined to the exterior case 2.
[0019]
The lead portions 22 and 24 drawn out of the through holes 54 and 56 are electrically
connected to the conductive patterns 50 and 52 with solder or a conductive adhesive. Further,
the through holes 54, 56 are filled with an insulating agent 53 as an insulating means and a
fixing means. As a result, it is possible to prevent unnecessary stress from being applied to the
lead portions 22 and 24, and to protect the electro-acoustic transducer from accidental accidents
such as disconnection, which contributes to the improvement of the reliability of the electroacoustic transducer.
[0020]
The external case 2 has a cylindrical shape formed of synthetic resin, and the basic configuration
is the same as that of the conventional electroacoustic transducer. In this embodiment, the base
portion 4 is formed of the metal base substrate 40. Since the iron core portion 60 is formed
integrally with the construction, in the electro-acoustic transducer of this embodiment, the
effective length of the iron core portion 60 is shortened and the height of the electro-acoustic
transducer is lowered. it is obvious.
[0021]
And since iron core portion 60 is formed of metal base substrate 40, it does not have an
incidental function like the conventional coupling means, but simply functions as a magnetic core
and also has a conventional base portion. There is no mechanical connection, and a magnetic
closed circuit integrated with the metal base substrate 40 is formed, and a part of the magnetic
path of the magnetic drive unit 5 is formed.
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For this reason, the magnetic properties are also good, and the acoustic properties are also
favorably influenced.
[0022]
A coil 20 is wound around the core portion 60, and an annular magnet 26 is provided around the
core portion 60, whereby the magnetic drive unit 5 is formed. The magnet 26 is firmly fixed to
the upper surface of the metal base substrate 40 with an adhesive or the like with a slight gap
between the magnet 26 and the periphery of the coil 20.
[0023]
A diaphragm 30 is provided which forms a closed magnetic path with the magnet 26 and is
driven by an oscillating magnetic field from the iron core 60 of the magnetic drive unit 5. The
peripheral portion of the diaphragm 30 is fixed to a bearing surface formed on the inner
peripheral portion of a spacing ring 28 provided so as to surround the magnet 26. The inner side
of the outer case 2 is provided with a step 27 and the front side is small in diameter, and the rear
is large in diameter, and the spacing holding ring 28 is fitted into this large diameter and
mechanically positioned and fixed It is being done.
[0024]
Further, a magnetic piece 34 for fixing mass to the diaphragm 30 and improving the magnetic
efficiency is fixed to a central portion on the outer surface side of the diaphragm 30. A resonance
space 36 is formed by the outer case 2 on the front side of the diaphragm 30, and a cylindrical
sound emission hole 38 for opening the resonance space 36 to the outside air is provided to face
the magnetic piece 34. It is done.
[0025]
Next, FIG. 3 shows a specific embodiment of the metal base substrate 40. As shown in FIG. The
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metal base substrate 40 is a closing means for closing the outer case 2 and, magnetically,
constitutes a part of a closed magnetic path, and is formed of a magnetic plate in order to
provide appropriate rigidity. For this reason, conductive patterns 50 and 52 that form terminals
for leading the lead portions 22 and 24 to the outside are formed. In this embodiment, an
insulating film 48 is formed on the surface of a metal base substrate 40 with an insulating paste
or the like, and conductive patterns 50 and 52 are formed on the surface of the metal base
substrate 40 with a conductive paste. The insulating film 48 may be formed of an insulating
paint, an oxide film or the like, and the conductive patterns 50 and 52 may be formed of a
copper foil or the like.
[0026]
According to such a configuration, as shown in FIG. 4, the blocking portion 42 and the terminal
portion 44 are placed according to the conductive pattern 64 of the printed circuit board 62 of
the electronic device, and electrically connected with the solder 66 It can be fixed to That is, it is
not necessary to provide a separate member for the installation of the electroacoustic transducer,
and the mechanical configuration and the electrical connection configuration around the
electroacoustic transducer can be simplified.
[0027]
And in this electroacoustic transducer, base part 4 is simplified by using metal base substrate 40
which integrated iron core part 60, and iron core part 60 is other members other than a
magnetic function with flattening. In addition to simplification of the configuration by reduction
of the number of parts, simplification of processing or assembly process can also be achieved. It
is In addition, there is an effect of suppressing the vibration which does not require the use of the
metal base substrate 40, which contributes to the improvement of the acoustic characteristics.
[0028]
Next, FIG. 5 shows another embodiment of the electroacoustic transducer of the present
invention. That is, as shown in FIG. 5, the bent portion 46 provided in the terminal portion 44 of
the metal base substrate 40 may be formed toward the back side, and the form thereof does not
prevent hybridization. In particular, the electro-acoustic transducer using the metal base
substrate 40 is not only its flattening but also changes the terminal form, and the degree of
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freedom such as simplification of a part of the circuit or fixing means from a simple lead Improve
Therefore, in such a configuration, the through hole 68 into which the bending portion 46 can be
inserted is formed on the printed circuit board 62 side to which the electroacoustic transducer is
to be attached, and the bending portion 46 is inserted into this and temporarily fixed. After that,
solder 66 or a conductive adhesive can be placed between the conductive pattern 64 on the back
side thereof and mechanically fixed together with the electrical connection. Compared with the
embodiment shown in FIG. 4, there is an advantage that the fixing strength with the printed
circuit board 62 is further enhanced, and the reliability can be enhanced.
[0029]
In the embodiment, the case where the connection or fixing between the terminal portion 44 and
the printed circuit board 62 is performed by solder or a conductive adhesive has been described.
However, the electroacoustic transducer of the present invention includes mechanical
components such as screws and nuts. Means such as cutting and raising the chassis may be used,
and the degree of freedom of the fixing means is not impaired.
[0030]
As described above, according to the present invention, an iron core portion is integrally formed
on one surface side of a base member formed of a magnetic material, and an insulating film is
interposed on the other surface side to form a terminal pattern. Since the terminals are formed,
the iron core as a conventional independent part can be omitted, the number of parts can be
reduced and the configuration can be simplified. Further, the electro-acoustic transducer can be
flattened by hybridizing the base member. Acoustic characteristics can be improved.
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