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JPS607299

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DESCRIPTION JPS607299
[0001]
The present invention relates to a diaphragm used for an acoustic transducer such as a
microphone or a headphone. As shown in FIGS. 1 and 2, this type of diaphragm 1 generally has a
dome 2 at the center and a voice coil attachment 4 to which the voice coil 3 is attached at its
outer periphery and back. The voice coil is formed concentrically from an edge portion 5 formed
in a convex shape on the outer peripheral portion of the mounting portion 4 and an edge fixing
portion 6 on the outer peripheral portion of the edge portion 5. These members are, for example,
polyethylene and polyester. Etc. are integrally manufactured by synthetic resin materials. In this
case, generally, the edge portion 5 is provided with a linear concave portion 7 called tangential 4
extending in a tangential direction with respect to the arc of the inner circumferential portion,
whereby the edge portion 5 becomes the voice coil 3. It is made to operate linearly to a sound or
an electric signal in the state which supported the etc. By the way, although a thin film having a
thickness of about 9 μm, 12 μm or 16 μm is usually used for such a diaphragm, it is known
that the low region does not extend unless the film thickness is reduced. However, if the thin film
is used to extend the low region, the workability is poor and the assembly is difficult, so there is a
defect that the defect rate becomes high. Here, the reason why the lower range extends when the
film thickness is thinner is explained by the equation (Sm is the stiffness of the vibration system
and Mo is the mass of the vibration diameter) indicating the low-pitch resonance frequency fo. In
order to extend the low region, that is, to lower the fo, it is necessary to lower the stiffness Sm of
the vibration system, assuming that the quality of the vibration system ffiMo is constant. In order
to lower the stiffness Sm of the vibration system, either a shape that lowers the stiffness Sm is
selected, or the thickness of the diaphragm is made thinner. Consideration was being made in the
direction of thinning. The present invention has been made in consideration of the abovementioned point in view of the reduction of the stiffness Sm of the vibration system from the
viewpoint of the shape. It is an object of the present invention to provide a diamond plum which
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can improve low-pass characteristics. That is, according to the present invention, the stiffness Sm
is reduced by forming the polyhedron annular shape of the edge portion of the diaphragm which
is conventionally convex and provided with linear four portions called "dential" on the surface, so
that the conventional film thickness can be reduced. It is characterized in that the low frequency
characteristics are significantly improved as it is. The present invention will be described in detail
below with reference to the embodiments shown in the attached drawings. FIG. 3 shows the front
of the diaphragm according to the present invention.
The diaphragm 11 has a dome portion 12 at a central portion, a voice coil attachment portion 14
to which a voice coil 3 (see FIG. 2) is attached on the back surface of the dome portion 12 and
the voice coil attachment portion 14. It is integrally formed concentrically from the edge portion
15 of the outer peripheral portion and the edge fixing portion 16 of the outer peripheral portion
of the edge portion 15. The dome portion 12 is formed to project spherically on the front side
(the front side in FIG. 3) as in the prior art, and an annular flat voice coil attachment portion 14 is
formed on the outer peripheral portion. The edge portion 15 is formed of a curved surface
protruding to the front side around the voice coil attachment portion 14. In the present
invention, the edge portion 15 has a polyhedral annular shape with the polyhedron 17 formed in
rotational symmetry as one unit. Is formed. The polyhedron 17 selects a point a among a large
number of points equally divided on the inscribed circle 18 of the edge portion 15, ie, the
boundary with the outer periphery of the voice coil attachment portion 14, and is adjacent to the
point a Point b, point C, and four points, tangent planes b ', C' circumscribed from c to the
inscribed circle 18 (tangent planes b ', C' contact points, tangent to c, voice coil "Perpendicular to
the surface of the lid portion 14" and a section bcc "1"] "formed by the tangent b" and C "and the
point b" and C "that intersect the circumscribed circle 9 of the edge portion 15" And The
enlarged view of the said part is shown in FIG. In FIG. 4, a point d which is one of the apexes of
the polyhedron 17 is a tangent plane of the point a located in the middle of the point C, and the
voice coil attached portion 14 or the surface of the polyhedron 17 " It is located at a point
slightly higher than the part 16. Also, one of the vertices, point e, is tangent plane b ′ ′ ′ 2
and is located at the same height as vertex d, and the other vertex, point r, is on tangent plane C
′. , Are located at the same height as the vertices d and e. The vertex e and the point f are
located in the same circle and circle "2" with respect to the center O of the diaphragm 11. The
radius of this concentric circle is smaller than the radius of the circumscribed circle 19 of the
edge portion 15, and the radius of the inscribed circle 18 Greater than. Further, the vertex d is
located inside the circumscribed circle 19 and outside the concentric circle in which the vertices
e and f are located. The polyhedron 17 formed by the apexes d, e, f located at the same height in
this relationship and the point bIcI 'lb' defining the section and the point a at the central portion
of c is , Sides a d + e b ", fc" on the valley line, side b c, ed. The six sides of cf, fd, db ′ ′ and d
Cn are toroidal lines, and the inner circle 18 has a circular arc c, and the circumscribed circle 19
has a circular arc C ′ ′.
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It is formed between d ". This form is clearly illustrated by the cross-sectional schematic view
along tangent plane b 'of polyhedron 17 shown in FIG. 5 and the cross-sectional schematic
diagram along tangent plane a' of polyhedron 17 shown in FIG. As can be understood from these
drawings, the polyhedron 17 is a pentahedron. The edge portion 15 is formed by rotating the
polyhedron 17 by an angle formed between the tangent plane l) 'and the tangent plane C', and in
other words, a rotation angle which makes the polyhedron 17 formed rotationally symmetrical
symmetrical. It is formed into a multi-faced annular shape, arranged along the inscribed surface
18 of the edge portion 15 and rotated over the entire surface. Therefore, if the point f of the
polyhedron 17 is replaced with the point e, or the point c ′ ′ is replaced with the point b ′ ′,
the polyhedron 17 becomes identical. Next, as another embodiment, FIGS. 7 and 8 show an
example in which a polyhedron forming one unit is formed into a heptahedron by increasing the
number of vertexes. In addition, the description which overlaps with a front example is
abbreviate | omitted, and a different point is mainly demonstrated. In this embodiment, it is
formed into a section bcc "bn comprising a tangent plane b ', a tangent plane C', an arc BC of the
inscribed circle 18 of the edge portion 15, and an arc c" b "of the circumscribed circle 19 of the
edge portion 15. The polyhedron 21 to be formed is one unit of a polyhedral annular shape
forming the edge portion 15. On the tangent plane a 'where the contact point a intersects, the
point g which is the apex of the vertex and the point are located at the same height point. Point i,
which is one of the vertices on tangent plane b '", and point j, which is the other vertex on
tangent plane C', have the same height and are slightly higher than points g and h Located at a
point. The vertex i and the point j are on the same concentric circle with respect to the center O
of the diaphragm 11, and the distance between the point g and the center O is larger than the
radius of the concentric circle and smaller than the radius of the circumscribed circle 19 of the
edge portion 15. Further, the distance between the point and the center 小 さ く is smaller than
the radius of the concentric circle and larger than the radius of the inscribed circle 18 of the
edge portion 15. A polyhedron 21 having sides gy h and l + J defined by such conditions and
each of which is surrounded by the tangent planes b 'and C' and the arc bC2C "b" has sides bi and
ib ". hg, CJ + JC "is a heptahedron whose valley line is hah, hi, hJ + jg + Jg + gb" + gC "is a valley
line. This form is clearly illustrated by the cross-sectional schematic view along tangent plane b
'of polyhedron 21 shown in FIG. 9, and the cross-section schematic diagram along tangent plane
a' of polyhedron 21 shown in FIG. The frequency 1 and r characteristics of the diaphragm 11
having such a configuration are shown in FIG.
The frequency characteristics shown in this figure are characteristics of the diaphragm 11 in
which the edge portion 15 is integrally formed in a five-sided polyhedral annular shape by a very
thin polyethylene film having a thickness of 9 μm. As can be seen from this measurement result,
the frequency characteristic of the low band extends up to 70 Hz and falls below 701-1 z. As
shown in FIG. 13, the frequency characteristic of the diaphragm 1 of the conventional shape
shown in FIG. 1 of the same film thickness is that the low range extends only to L I OI-I Z] and
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less than 10 I-T z It is slow down. Thus, in the case of the diaphragms 1 and 11 having the same
film thickness, the low region is extended by 401-1 z, and it can be seen that the frequency
characteristics of the low region are significantly improved. On the other hand, FIG. 12 shows the
frequency characteristics of the diaphragm 11 integrally formed in the edge structure according
to the present invention by using a polyethylene film having a thickness of 12 μm. From this
measurement result, it can be understood that the frequency characteristic of the low range of
the diaphragm 11 is up to OO Hz, and less than 100 Hz. This indicates that the product of the
present invention, which is formed using a polyethylene film having a thickness of 12 μ, is more
extended than the conventional product formed using a polyethylene film having a thickness of 9
μ. ing. Therefore, the film thickness of the diaphragm 11 capable of obtaining the same low-pass
characteristics is sufficient if it is thicker than the conventional film thickness. In addition, it is
confirmed that the diaphragm 11 having the edge portion 15 in which one unit of the polyhedral
annular shape is formed in the heptahedron 2 exhibits a frequency characteristic similar to that
of the pentahedron 17. This indicates that the above-mentioned polyhedral ring-shaped edge
portion 15 is shaped to lower the stiffness Srn of the vibration type, which is the bass resonance
frequency f. Is a factor that has significantly reduced As is apparent from the foregoing, in the
case of the diaphragm having the edge portion formed in a polyhedral annular shape, the OL
region characteristics can be significantly improved as compared with the prior art when the film
thickness is the same. However, it is possible to obtain low-pass characteristics comparable to
those of conventional tire thickness film thickness. Therefore, according to the present invention,
even when producing a diaphragm having good low-pass characteristics, it is possible to use a
thick film having good workability, not a thin film having poor workability as in the prior art. The
product failure rate can be reduced and the manufacturing efficiency can be significantly
improved, and the effect is remarkable.
[0002]
Brief description of the drawings
[0003]
1 is a front view of a conventional diaphragm, FIG. 2 is a cross-sectional view thereof, FIG. 3 is a
front view of a diaphragm according to the present invention, FIG. 4 is a partially enlarged view
thereof, and FIG. Fig. 6 is a schematic cross-sectional view along the tangent plane a 'in Fig. 3;
Fig. 7 is a front view of a duff (a front face of a yaffram) according to the present invention; FIG.
8 is a partial enlarged view thereof, FIG. 9 is a schematic cross-sectional view taken along the
tangent plane b 'in FIG. 7, FIG. 10 is a schematic cross-sectional view along the tangent plane a'
in FIG. FIGS. 11 and 12 are graphs showing the frequency characteristics of the diaphragm
according to the present invention, and FIG. 13 is a graph showing the frequency characteristics
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of the conventional diaphragm 11.
In the figure, 1, 11 are diaphragms, 2 and 12 are domes, 3 is a voice coil, 4.14 is a voice coil
attached portion, 5.15 is an edge portion, 6 and 16 are edge fixing portions, 7 is a recess, 17.21
is a polyhedron, 18 is an inscribed circle of the edge portion 15, 19 is a circumscribed circle of
the edge portion 15, and 20 is a polyhedron adjacent to the polyhedron 17, I. b, c are contact
points, a ', b', a 'are tangent planes, b ". C "is a point at which the tangent plane cuts the
circumscribed circle 19, d + Q + f + g +) l + 1 + 3 is each vertex of the polyhedron, and O is the
center of the diaphragm. Patent applicant Otoitekuni Co., Ltd. Attorney at a patent attorney
Takuya Ohara Fig. 7 ヱ 91 11 '5'; 10 i: n (Fig. 8
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