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JP3020214

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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
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DESCRIPTION JP3020214
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vibrating membrane, and more particularly to an acoustic vibrating membrane with high
sensitivity and good frequency response effect.
[0002]
2. Description of the Related Art An acoustic system such as a microphone capsule or the like is
divided into two types, capacitor type and moving coil type, according to its application principle,
of which moving coil microphone capsules are high, middle, The frequency response in the low
frequency range is generated, and a coil attached to the vibrating membrane traverses the
magnetic field lines in the magnetic field along with the acoustic response vibration to generate
the induced superpower of the audio frequency, and then passes through the amplifier. The
signal is amplified and optionally output from the horn. FIG. 4 is a schematic three-dimensional
view of an example of a conventional diaphragm, wherein the diaphragm exhibits a thin and light
circular membrane plate and forms a spherical portion 11 projecting upward in the center of the
membrane plate 10 An arc-shaped convex ring portion 12 protruding slightly upward so as to
surround the periphery of the spherical portion 11 is provided, and the coil 13 is directed
downward from the back at the connection boundary between the convex ring portion 12 and
the spherical portion 11. A plurality of rib stripes 14 are formed on the surface of the convex
ring portion 12, and a flat peripheral portion 15 is provided around the outer peripheral edge of
the convex ring portion 12. And, as to the division of the frequency response of the entire
diaphragm, the membrane plate 10 has the spherical portion 11 as the high-pitched response
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area, the convex ring portion 12 as the low-pitched response area, and the rib streaks 14 in the
convex ring portion 12 respond to the middle tone It is an area. The quality of the response
effect depends on the hardness and softness of each response area in the membrane plate 10.
For example, the high tone response area needs to be relatively hard, and the bass response area
is desired to be relatively soft. However, since this type of conventional vibrating membrane is
integrally formed of a single piece of membrane, the entire response quality of the membrane
plate is uniform and the hardness is uniform. And the effect is not so ideal, it is used only in
places of general ordinary class.
[0003]
Next, another type of vibrating film will appear on the market, and as shown in FIG. 5, this type
of vibrating film 20 similarly has a spherical portion 211, a convex link portion 212 and a flat
peripheral portion on the film plate 21. 213 is provided, and different from the vibrating
membrane 10, the coating film 22 having the same size and shape as the spherical portion 211 is
further attached to the upper surface of the spherical portion 211. The hardness of the treble
response area (i.e., the spherical portion 211) is thus increased to obtain a better treble
frequency response. This can improve the frequency response effect of the vibrating film 20.
However, the coating film 22 and the spherical portion 211 of the film plate 21 dry quickly and
the surface and the surface are bonded with a two-component adhesive. The adhesion and
bonding increase the weight of the vibrating membrane 20 and the sensitivity is affected.
[0004]
SUMMARY OF THE INVENTION In view of the problems of the above-described conventional
acoustic vibrating membrane, the present invention aims to provide an acoustic vibrating
membrane having high sensitivity and good frequency response effect.
[0005]
SUMMARY OF THE INVENTION In order to achieve the above object, according to the present
invention, a spherical portion is provided in a convex manner at the central portion of the
membrane plate, and a convex ring is provided around the spherical portion, And an acoustic
vibration film formed by sticking a covering film on the surface of the spherical portion and
adhering and fixing the upper end periphery of the coil to the bottom of the connection boundary
between the spherical portion and the convex ring portion. Formed of a film body having a
predetermined thickness equal to the size of the portion, and the adhesion site of the coating film
and the spherical portion is limited to the constant width range of the coating film peripheral
edge and the corresponding spherical portion peripheral edge And be configured.
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[0006]
The adhesion site between the coating film and the spherical portion is limited to the periphery
of the coating film and the upper surface of the connection boundary, and a through hole having
a predetermined aperture size is bored in the central portion of the spherical portion. It is more
preferable if it is provided.
[0007]
In the present invention configured as described above, the thickness of the coating film
provided on the upper surface of the spherical portion enhances the hardness of the high sound
response area (that is, the spherical portion) to obtain better high sound frequency response. In
addition, since the convex ring portion of the relatively soft membrane plate is formed in the bass
response area, an excellent frequency response effect can be obtained.
In addition, the coating film simply adheres the peripheral edge to the upper surface of the
connection boundary between the spherical portion and the convex ring portion of the
membrane plate, and the hole diameter formed in the center of the spherical portion can be
changed appropriately. The sensitivity is not affected without increasing the overall weight of the
vibrating membrane.
[0008]
The above and other objects, features and advantages of the present invention will be more
apparent from the detailed description of the following embodiments with reference to the
drawings.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, the acoustic vibration film
of a relatively preferred embodiment of the present invention mainly comprises a film plate 30, a
coating film 40 and a coil 50, among which the film plate Reference numeral 30 denotes a
circular thin film, which has an upward spherical portion 31 raised at the center of the film
surface, and a through hole 32 having a predetermined aperture size is bored in the center of the
spherical portion 31. The weight of the vibrating film is adjusted by appropriately changing the
aperture size of the diaphragm, and a convex ring portion 33 protruding slightly upward around
the spherical portion 31 is provided so as to surround the convex ring portion 33 by a
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predetermined distance. A large number of riffs 34 are provided on the surface, and a flat
peripheral portion 15 is provided around the outer periphery of the convex ring 33.
[0010]
The covering film 40 is a circular film having the same size and shape as the above-mentioned
spherical portion 31 having a suitable thickness, and the film peripheral edge 41 is a spherical
portion 31 of the film plate 30 and a convex ring portion 33. It is stuck on the upper surface of
the connection boundary 36 and is stuck on the upper surface of the spherical portion 31.
The thickness of the covering film 40 is determined by the response effect required for the
vibrating film, and the material may be a hard and light material of nylon (MYLAR) or aluminum
alloy.
[0011]
The coil 50 is positioned such that the upper end periphery thereof is adhered to the bottom of
the connecting boundary 36 between the spherical portion 31 and the convex ring portion 33 of
the membrane plate 30.
[0012]
In the above, the main member structure of the acoustic vibration film of the present invention
and the relative position of each other have been described. However, when assembling the
present invention, first, as shown in FIG. The film peripheral edge 41 of the coating film 40 is
connected between the spherical surface portion 31 of the film plate 30 and the convex ring
portion 33 by means of a quick-drying adhesive or a two-component mixture type adhesive or an
ultrasonic method. The assembly is completed by sticking or fixing on the upper surface of the
boundary 36 and further bonding the upper peripheral edge of the coil 50 to the bottom of the
connecting boundary 36.
When the diaphragm is internally mounted in the microphone capsule 60, as shown in FIG. 3, the
coil 50 is used to fit on the upper end edge of the magnet 61 of the microphone capsule 60, and
the periphery around the outer periphery of the membrane plate 30. The portion 35 may be in
contact so as to be positioned on the periphery of the upper end face of the outer rubber ring 62
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of the microphone capsule 60.
[0013]
The acoustic vibrating membrane of the present invention thus constructed has the following
advantages.
The present invention utilizes the thickness provided in the covering film 40 to provide the
required relatively hard and light membrane characteristics of the high sound response area, and
the convex ring portion 33 of the relatively soft membrane plate 30 to provide a bass response
While the best frequency response effect can be obtained from the area, the adhesion point
between the coating film 40 and the membrane plate 30 is limited to the connection boundary
36 of the membrane plate, so that the response of the conventional high sound response area
Even if the degree is improved, the defect in which the sensitivity is affected by the weight
increase due to the adhesive surface can be improved, and the weight of the vibrating membrane
can be adjusted by appropriately changing the aperture size of the through hole 32 of the
membrane plate 30. The microphone of
6 and 7 are frequency response test tables of microphone diaphragms according to the prior art
(uncoated film) (FIG. 6) and the present invention (FIG. 7), respectively.
As shown in FIG. 6, the conventional diaphragm has a thickness of 0.012 mm and a resistance of
300. On the other hand, as shown in FIG. 7, according to the present invention, a coating having
a thickness of 0.012 mm and a resistance of 300 is similarly provided with a through hole having
a diameter of 8 at its central portion and a coating film having a thickness of 0.038 mm. Then,
when tested under the same conditions, when the 1K and 0db appearing in the table are taken as
reference points, the treble expression of the present invention is clearly better than the
conventional diaphragm, ie, treble The response effect is better.
[0014]
As noted above, the present invention allows the thickness of the coating to be adequate to
provide the relatively hard and light membrane properties required of the treble response area,
and a comparison. The best frequency response effect can be obtained by using the convex ring
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portion of the soft membrane plate as the bass response area. In addition, since the location
where the coating film and the thin plate are fixed is limited to the connection boundary of the
membrane plate, even if the high sound response area of the prior art improves the response
effect, the weight increase due to the front bonding of the adhesive surface increases the
sensitivity Can improve the defect that is affected, and by changing the size of the hole diameter
of the through hole of the membrane plate appropriately, the weight of the vibrating membrane
can be adjusted, so that the highest quality microphone can be obtained.
[0015]
Brief description of the drawings
[0016]
1 is an exploded view of a relatively preferred embodiment of the present invention.
[0017]
2 is a sectional view showing the completion of the combination of the above embodiment.
[0018]
3 is a cross-sectional view of the microphone capsule of the above embodiment.
[0019]
4 is a three-dimensional display view of a conventional microphone diaphragm.
[0020]
FIG. 5 is a cross-sectional view of another prior art microphone diaphragm;
[0021]
6 is a diagram showing the frequency response test results of the conventional acoustic
diaphragm.
[0022]
7 is a diagram showing the frequency response test results of the acoustic vibrating membrane
of the present invention.
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[0023]
Explanation of sign
[0024]
Reference Signs List 30 film plate 31 spherical portion 32 through hole 33 convex ring portion
35 peripheral portion 40 coating film 50 coil
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