close

Вход

Забыли?

вход по аккаунту

?

JPS55137798

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
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 JPS55137798
Specification] 1 Name of Invention
Electro-acoustic transducer
3. Detailed Description of the Invention The present invention relates to electro-acoustic
transducers such as dynamic microphone microphone units. For example, in a small-sized electric
transformation transducer such as a dynamic microphone, the diaphragm is often formed
integrally with the same material as the vibration main portion (so-called dome portion) and the
peripheral support portion (so-called edge portion). As such a material of the diaphragm, a
material which satisfies various conditions such as air tightness, internal loss, strength,
moldability, and the like, and which can realize a compact high-contrast edge is desired. Here,
FIG. 1 is a cross-sectional view showing an example of the diaphragm 1 in the conventional
electroacoustic transducer, for example, a dome portion which is a vibration main portion formed
by molding using a plastic film such as polyester etc. 2 and an edge portion 3 which is a
peripheral support portion are integrally formed. In such a conventional diaphragm 1, if it is
intended to increase the thickness of the diaphragm 1 itself to increase rigidity, for example, in
order to prevent unnecessary deformation even when dog sound pressure is applied, an edge
which is a support portion The compliance of part 3 is lowered, and the lowest frequency 10 is
increased, and the low frequency characteristics are deteriorated. For this reason, as shown in
FIG. The laminate film 4 as a separate member is adhered and fixed to the dome portion 2 which
is the vibration main portion of the diaphragm 1 to increase the rigidity of the dome portion 2
and the alge portion 3 remains thin at the peripheral portion. By leaving, Hyphen Brians above /
EndPage: 1 low, human resistance is also obtained good characteristics high. For example, as
shown in FIG. 3, such adhesion of the laminate film 4 may extend to a region slightly protruding
from the outer periphery of the dome portion 2, and even in this case, the vicinity of the outer
11-05-2019
1
peripheral edge of the edge portion 3 is thin. Since it is left as it is, the diaphragm 1 of NO
compliance is obtained. However, in a small electroacoustic transducer such as a dynamic
microphone, the size of the diaphragm itself is small and the thickness is also thin, so the work of
bonding the laminate film 4 is difficult, and an adhesive is required. Because of this, variations in
the thickness of the adhesive and the physical properties of the adhesive itself cause variations in
the characteristics of the diaphragm as a product. There are problems such as the failure to
obtain the desired characteristics. The present invention has been made to eliminate such
conventional drawbacks, and the rigidity of the vibration main portion is high. And it is a
diaphragm with high compliance of the peripheral support part, and the converter performance
at adult power improves and also.
It is an object of the present invention to provide an electroacoustic transducer having a
diaphragm in which the variation in characteristics and sound quality is small (and the
manufacturing operation efficiency is high). Hereinafter, preferred embodiments according to the
present invention will be described with reference to the drawings. Here, FIGS. 4 to 8 show the
first embodiment of the present invention along the manufacturing steps. First, a plastic material
to be a diaphragm material, for example, a thick film or chip of polyester, styrene, polycarbonate
or the like, is heated and melted, for example, using a molding jig 6 as shown in FIG. . The
molding jig 6 has a structure of being split into upper and lower halves, and the opposing surface
is substantially planar. It is for forming a sheet-like diaphragm film. Furthermore, a spacer ? for
attaching the thickness of the edge portion (peripheral support portion) of the diaphragm is
attached to the jig 6a of at least one of the pair of opposing surfaces (downward in the figure). A
recess 8 is formed in the portion for giving the thickness of the vibration main portion of the
diaphragm. Assuming that the thickness of the vibration main portion 14 of the diaphragm thin
film 13 shown in FIG. 5 made by using such a molding jig B is 1+, and the thickness ? t2 of the
peripheral support portion 15, the above molding The thickness of the spacer ? of the jig 6 is
12, and the depth of the recess 8 is 1. ?????????? Further, at the time of molding
processing, for example, a polyester film 9 having a thickness equal to or larger than thickness t
is disposed between upper and lower molding jigs 6 '' + 6b, and the molding jig is heated to
about 280 ░ C. to melt the polyester film 9 At the same time, the upper and lower molding jigs
6a + 6b are pressed in close contact with each other. After that, if it is cooled, a diaphragm film
No. having a shape as shown in FIG. 5 can be obtained between the forming jigs 5a and 5b. Next,
the diaphragm film 13 having a thick central part and a thin peripheral part is placed on a
molding die 16 as shown in FIG. 6 and blown from above in one drawing. Air (see arrow. The
diaphragm 17 (see FIG. 7) has a desired shape depending on the pressure of. Molded into). This
molding method is a general thermal nitriding method, and for example, a projection 18 is
formed at the center of the dome-shaped portion of the molding die 16, and the projection 18 is
formed at the center of the diaphragm film 13. The diaphragm film 130 is positioned by guiding
the concave 4 and the holes (not shown). Further, holes 19 for removing air are formed at
predetermined positions of the molding die 160 so as to pass through in the vertical direction in
11-05-2019
2
the drawing, and these films are formed by air accumulated between the diaphragm film 13 and
the molding die 16. It is prevented that the adhesion with the mold is disturbed.
Thus, for example, in the diaphragm 17 shown in FIG. 7 formed by a forming method such as
pressure aging and the like, the thickness tl of the vibration main portion 14 which is a dome
portion is the thickness of the peripheral support portion 15 which is an edge portion. It is
thicker than t2. Therefore, the rigidity of the vibration main portion 14 is high, and undesirable
deformation such as distortion does not occur even at a large input, and a high compliance edge
can be easily realized by thinning the peripheral support portion 15 of the edge portion, The low
bass resonance frequency k can be well reproduced without distortion. FIG. 8 shows a
microphone unit 30 of a dynamic microphone as an example of an electro-acoustic transducer
configured by using this diaphragm 17. EndPage: 2 magnet, magnet 31, yoke 32, center pole 33,
and plate The voice coil 36 is disposed in the air gap 35 in the magnetic circuit 34, and the coil
bobbin 3? around which the voice coil 36 is wound is connected to the vicinity of the periphery
of the vibration main portion 140 of the diaphragm 17. According to the microphone unit 30,
which is an electroacoustic transducer configured as described above, since the diaphragm 17 of
high rigidity and Hyphen Bryans is used, frequency characteristics and sound quality can be
improved, and input resistance is also improved. . Moreover, since the vibration main portion 14
of the dome portion is already formed thicker than the peripheral support portion 15 of the edge
portion, the work of bonding a laminate film or the like as in the conventional case becomes
unnecessary. The manufacturing and assembly work efficiency is high (the mass productivity is
improved, and an inexpensive supply is also possible. Incidentally, by partially changing the
molding jig 6 in the first embodiment, it is possible to obtain the diaphragm film 13 having three
stages of thickness as shown in FIG. That is, the diaphragm film 13 ? has a thickness 1 of the
vibration main portion 14. And an intermediate portion 15 'having a thickness t3 (t,> t3> t2)
between the thickness t2 of the outer peripheral edge portion of the peripheral support portion
15 and the outer peripheral edge of the peripheral support portion 15 from the outer periphery
of the vibration main portion 14. It is formed between the parts. If such a diaphragm film 13 'is
pressure-aged and matured as in FIG. 6 and combined with a magnetic circuit, a microphone unit
3d according to a second embodiment of the present invention as shown in FIG. 10 is configured.
it can. The other configuration is the same as that of FIG. 8, so the same reference numerals are
given to the same parts and the description will be omitted. Next, FIG. 11 shows a forming jig 10
for forming a diaphragm used in the third embodiment of the present invention.
The forming jig 10 has a structure capable of forming a diaphragm having a desired threedimensional shape, which is divided into upper and lower halves, on each of the opposing
surfaces. That is, the lower forming jig 10a in the figure has a dome-shaped protrusion 11a at the
center, and has a protrusion 12a having a semicircular cross section corresponding to the shape
of the edge around the protrusion 11a. doing. Also, in a manner corresponding to these
11-05-2019
3
projections 11a and 12a, a dome-shaped recess Ilb and a recess 12b having a semicircular crosssection are formed in the upper forming jig 10b in the drawing. Further, a spacer 7 for attaching
the thickness t2 of the edge portion is attached near the end portion of the lower molding jig
10a, and when the upper molding jig 10b is pressed, the concave portion of the above-mentioned
edge portion The gap dimension between the projection 12a and the projection 12a is t2 and the
gap dimension between the recess 11b and the projection 11a of the vibration main portion
(dome portion) is t1. It is configured to be. Therefore, for example, a film 9 of polyester or the
like having a thickness of t1 or more is disposed between these molding jigs 10a and 10b, heated
and melted, and then cooled and taken out, the vibration of the shape as shown in FIG. Plate 1?
can be obtained directly. Therefore, the pressure aging process in the first embodiment (see FIG.
6). ) Can be omitted, the work process can be shortened, and mass productivity can be further
improved. Next, FIG. 12 shows an 8- microphone unit 30 in the same manner as the fourth
embodiment of the present invention, and the thickness 1 as the diaphragm 1?. The portion of
the second embodiment is formed to extend from the vibration main portion 14 to an
intermediate position of the peripheral support portion 15. The other configuration is the same
as the description of FIG. 8 described above, so the same reference numerals are given to the
same or equivalent parts in the drawing and the description will be omitted. As apparent from
the above description, the features of the electroacoustic transducer according to the present
invention include a magnet, a magnetic circuit having a yoke, a voice coil disposed in an air gap
formed in the magnetic circuit, and A diaphragm is connected to the voice coil, and the
diaphragm is integrally formed by heating and melting the diaphragm material so that the
thickness of the vibration main portion is larger than that of the peripheral support portion.
Therefore, a diaphragm of high rigidity and Hyphen Bryans can be obtained, and the frequency
characteristics and sound quality of the electroacoustic transducer can be easily improved. In
addition, since the diaphragm does not require the laminating operation as in the prior art, the
manufacturing and assembling operation efficiency is greatly improved, and the EndPage: 3 mass
production efficiency is also increased.
?
4. Brief Description of the Drawings FIGS. 1 to 3 are cross-sectional views showing the main parts
of different conventional examples. FIGS. 4 to 8 show the first embodiment of the present
invention along the manufacturing steps, and FIG. 4 is a cross-sectional view of a forming jig, and
FIG. 5 is a cross-sectional view of a diaphragm film Fig. 6 is a schematic cross-sectional view for
explaining the pressure aging method, Fig. 7 is a cross-sectional view of a diaphragm, and Fig. 8
is a cross-sectional view of a microphone unit. FIGS. 9 and 10 show a second embodiment of the
present invention, FIG. 9 is a sectional view of a diaphragm film, and FIG. 10 is a sectional view of
a microphone unit. FIG. 11 is a cross-sectional view of a molding jig used in the third
embodiment of the present invention. FIG. 12 is a cross-sectional view showing a microphone
11-05-2019
4
unit as a fourth embodiment of the present invention. 6.10 иииииииииииииииииииииииииииииииииииииииииии Diaphragm film
11 ? 14 иииииииииииииииии ииииии Vibration main part 15.15 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Microphone
unit patent application Person Sony Corporation Attorney Attorney Attorney Koike 12-1st Field
3-4 Figure 1 Figure 6 EndPage: ?
11-05-2019
5
Документ
Категория
Без категории
Просмотров
0
Размер файла
15 Кб
Теги
jps55137798
1/--страниц
Пожаловаться на содержимое документа