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JPS62197000

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DESCRIPTION JPS62197000
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker apparatus having a dome-shaped diaphragm and suitable for use in high fidelity
reproduction for medium and high sound. [Summary of the Invention] The present invention
relates to a speaker device having a dome-shaped diaphragm, wherein the diaphragm has an
angular dome shape in which the peripheral portion is a quadrilateral and is gradually deformed
into a spherically curved surface toward the central portion The shape of the end of the bobbin is
a corrugated shape that can be in close contact with the vibrating node circle of the diaphragm,
and by connecting the cylindrical bobbin to the vibrating node circle of the angular dome-shaped
diaphragm and driving it It is not necessary to generate divided vibration from the frequency
(dispersing the sharp peak in the high limit frequency to enable more faithful signal
reproduction. [Prior Art] In order to enable more faithful signal reproduction as diaphragms of
conventional speaker devices, diaphragms of shapes such as cones, domes and planars have been
proposed, but they are still unsolved problems There is a point, and something more
sophisticated is required. For example, in a cone-shaped or dome-shaped diaphragm, due to its
shape, acoustic resonance occurs and there is a problem that the frequency characteristic is
disturbed. Further, in the planar diaphragm, there is a problem that the rigidity is poor in shape
and divided vibration occurs from a low frequency, so that faithful signal reproduction is difficult.
Therefore, it has been proposed to increase the rigidity by increasing the frequency by which the
divided vibration is generated, and to widen the possible zone of the piston movement, by
forming the diaphragm in a multilayer structure or by providing asperities. In addition, as a
method of suppressing the split vibration without changing the structure or the shape of the
diaphragm and expanding the possible zone of the piston movement, it is proposed to drive the
split vibration node. By the way, a hard dome diaphragm using metal etc. as a conventional
dome-shaped diaphragm, and a soft dome diaphragm using cloth or film are known. The shape is
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generally in the form of a bowl, that is, a hemispherical shape. Therefore, a plurality of divided
vibration nodes are generated concentrically around the top of the diaphragm. The upper limit
frequency Fh in this case is expressed by the following equation for each vibration node. ml:
Mass of voice coil including diaphragm outside vibration node, mt: Mass of diaphragm inside
vibration node. S: @ Stiffness C of Joints Problem to be Solved by the Invention] Actually, in the
hard dome diaphragm using the hard material described above, piston movement is performed
up to a high frequency, but As shown by the broken line in FIG. 8, there is a problem that a sharp
single resonance peak is generated at the upper limit frequency.
Also, in soft domes using soft materials, although peak and dip do not occur as shown by the
solid line in FIG. 8 regarding frequency characteristics, divided vibration occurs from low
frequencies, and faithful signal reproduction is not permitted There is a problem. Therefore, an
object of the present invention is to provide a speaker device in which piston movement is
performed over a wide band, no sharp peak is generated at high frequency limit frequencies, and
more faithful signal reproduction is enabled. [Means for Solving the Problems] The present
invention has a diaphragm 11 having a quadrangular peripheral portion which gradually
deforms to a spherical surface toward the central portion, and a waveform which can be in close
contact with the vibration node position of the diaphragm 11 It is a speaker device characterized
in that a cylindrical bobbin 8 provided with an end 10 of a shape is coupled. J action] The shape
of the diaphragm 11 is an angular dome shape in which the peripheral portion is made a
quadrilateral and gradually deformed to a spherical curved surface toward the central portion,
and the shape of the end portion 10 of the cylindrical bobbin 8 is the vibration of the diaphragm
11 The cylindrical bobbin 8 is coupled to the vibrating node circle of the angular dome-shaped
diaphragm 11 which has a corrugated shape that can be in close contact with the node circle.
The shape of the diaphragm 11 is such that the stiffness of the vibrating nodes is not uniform,
and when the diaphragm 11 is driven, a single resonance peak is dispersed and a sharp peak is
not generated. An embodiment of the present invention will now be described with reference to
the drawings. FIG. 1 is a partial side elevational view of an embodiment of the present invention,
and FIG. 2 is a top view of an embodiment of the present invention. In FIG. 1 and FIG. 2, 1 shows
the whole speaker. The speaker 1 is a pole piece 2 as a non-vibration system. マグネット3.
Plate 4 and frame 5 and the like, and a diaphragm 11 as a vibration system. ボイスコイル9. It
is comprised by the bobbin 8 grade | etc.,. Pole pieces as shown in FIG. A magnetic circuit is
configured by the magnet 3 and the plate 4. At a position to be a central portion of the pole piece
2, a cylindrical projecting portion whose inside is hollow is extended, and this projecting portion
is a center ball. The ring-shaped magnet 3 is stacked so that the center ball is at the center, the
plate 4 is stacked on the magnet 3, and the frame 5 is fixed to the plate 4. Therefore, a magnetic
gap is formed between the outer periphery of the protrusion of the pole piece 2 and the plate 4.
What is indicated by 11 in FIGS. 1 and 2 is a diaphragm. As the diaphragm 11, for example, a
metal plate such as titanium having a uniform thickness (about 50 μm) is used.
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Further, as shown in FIGS. 1 and 2, the shape of the diaphragm 11 is formed into an angular
dome shape in which the peripheral portion is substantially rectangular and is gradually
deformed toward a spherical surface toward the central portion thereof. It is done. A cylindrical
bobbin 8 around which the voice coil 9 is wound is fixed in close contact with the divided
vibration nodes of the diaphragm 11 so that the voice coil 9 and the diaphragm 11 are coupled.
The voice coil 9 is fixed to the periphery of the frame 50 via the edge 12 of the diaphragm 11 in
the form of being inserted in the magnetic gap described above, and the damper 7 is attached
between the peripheral surface of the cylindrical bobbin 8 and the frame 5 , And the diaphragm
11 is supported. The cover plate 6 is fixed to the frame 5. 3A, 3B and 3C show a vibration system
as an example in one embodiment of the present invention, and FIG. 3A is a top view of the
diaphragm 11, which is a diaphragm An edge 12 is fixed to the peripheral edge portion 11. 3B
shows a cross section at the position of the alternate long and short dash line A-A 'in FIG. 3A, and
FIG. 3C shows a cross section at the position of the alternate long and short dash line B-B' in FIG.
It is a thing. When the vibration node circle is generated so as to be substantially inscribed in the
junction 13 between the peripheral edge of the diaphragm 11 and the edge 12 as shown by the
broken line in FIG. 3A, a cylinder in which the voice coil 9 is wound The shape of one end 10 of
the bobbin 8 of the shape is made into a wave-like shape over the whole as shown in FIG. In the
drawing, the end 10 of the bobbin 8 is at the lowest position in the figure, and the end 10 of the
bobbin 8 is at a position where the diagonal of the diaphragm 11 and the vibration node circle
intersect (for example, in FIG. 3). Is the highest. 5A, 5B and 5C show a vibration system as an
example of a pond in an embodiment of the present invention, and FIG. 5A is a top view of the
diaphragm 11. A flat joint 15 is provided at the periphery of the e-diaphragm 110, and an edge
14 is fixed to the joint 15. 5B shows a cross section at the position of alternate long and short
dash line A-A in FIG. 5A, and FIG. 5C shows a cross section at the position of single point chain
'dAB-B' in FIG. It is a thing. In FIG. 5A, as shown by the broken line, in the case where the
vibration node circle is generated on the flat joint 15, the shape of one end 10 of the cylindrical
bobbin 8 around which the voice coil 9 is wound is It has a corrugated shape that is partially
flattened. That is, the end 10 of the bobbin 8 is lowest at a portion where the vibration node
circle is generated at the flat joint 15 of the diaphragm 11 (for example, shown by ▪ in FIG. 5).
Thus, the end 10 of the bobbin 8 is maximized at a position where the diagonal of the diaphragm
11 intersects with the vibration node circle (e.g., shown by 1 in FIG. 5).
As described above, the end 10 of the bobbin 8 thus corrugated is fixed in intimate contact with
the position of the vibration node of the diaphragm 11, and the voice coil 9 and the diaphragm
11 are combined. When a voice current is supplied to the voice coil 9 while the voice coil 9 is
positioned in the interview gap, the bobbin 8 vibrates in the axial direction by the direction of the
current, and the diaphragm 11 is driven on the entire surface. At that time, since the shape of the
diaphragm 11 is an angular dome shape in which the stiffness on the vibrating node circle is not
single, the signal reproduction is performed in a form in which a single resonance peak is
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dispersed. FIG. 7 shows an output sound pressure frequency characteristic and an electrical
impedance characteristic according to an embodiment of the present invention. In FIG. 7, a solid
line 21 shows an output sound pressure frequency characteristic and a solid line 22 shows an
electrical impedance characteristic. . As apparent from FIG. 7, a flat characteristic is obtained
between 500 and 1 kHz, and a single resonance peak does not occur at the upper limit frequency
as in the conventional speaker device. In the embodiment of the present invention, although the
case of using a metal or the like as the material of the vibration vi11 has been described, the
diaphragm 11 made of a polymer material such as a polyester film or the like may be used. The
diaphragm 11 may be a single plate or a laminated plate. Further, when the bobbin 8 and the
diaphragm 11 are fixed, a flat slope 20 as shown in FIG. 6 may be interposed between the bottom
of the diaphragm 11 and fixed. According to the present invention, in the present invention, the
shape of the diaphragm is an angular dome shape in which the peripheral portion is made a
quadrilateral and gradually deformed toward the central portion toward the central portion, and
the shape of the end of the cylindrical bobbin is the diaphragm The cylindrical bobbin is coupled
to the vibrating node circle of the angular dome-shaped diaphragm. Therefore, according to the
present invention, since the stiffness of the vibrating nodes of the diaphragm is not uniform, even
when the diaphragm of the hard dome made of a hard material is driven, a single resonance peak
is obtained. Are dispersed and no sharp peak occurs. Further, according to the present invention,
since the vibration node circle of the diaphragm is driven 7 L, the piston of the soft dome made
of a soft material or the diaphragm having poor rigidity close to the flat shape is driven. The
range of motion is expanded, enabling more faithful signal reproduction.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a partial sectional view of an embodiment of the present invention, FIG. 2 is a top view
of an embodiment of the present invention, and FIG. 3 is a route diagram of an example of a
vibration system according to an embodiment of the present invention 4 is a perspective view of
an example of a bobbin of a voice coil in one embodiment of the present invention, FIG. 5 is a
route diagram of another example of a vibration system in one embodiment of the present
invention, and FIG. Fig. 7 is a perspective view used to explain another example of the support
configuration of Fig. 7, Fig. 7 is a graph used to explain one embodiment of the present invention,
and Fig. 8 is a graph used to explain a conventional speaker device.
Description of major symbols in the drawings 2: pole piece 3: magneft, 4 nibrates, 5: frame, 8:
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voice coil bobbin, 9: voice coil, 10: end of voice coil bobbin, 11 ': diaphragm . Fig. 3 B 1 n 支持
Support of the motion Fig. 7 Procedure correction room Date: August 22, 1986 General Secretary
of the Patent Office Black 1) Akira Yutaka Patent Application No. 40050 No. 2 Name of the
Invention Speaker Device 3 , Relationship with the case to make corrections Patent applicant
address 6-7 7-35 for Kita Part for Tokyo Parts Name (218) Sony Corporation Representative
Director Norio Oga 4; Agent Address Higashi-Ikebukuro 1-chome, Toshima-ku, Tokyo No. 48, No.
6, column 7 of the detailed description of the invention of the specification of correction,
contents of correction (1) In the specification, page 2, line 10 to page 3, line 8, "Conventional
speaker As a diaphragm of the device · · · · · · · · · · · · · · · · · have been proposed. By the way, delete
". (2) On page 3, line 18, delete "Include diaphragm outside vibrator node". (3) On the same page
3, line 19, correct "the mass of the diaphragm inside the vibration node" as "the equivalent mass
of the diaphragm". (4) On the same page 3, line 20, correct "stiffness of the vibratory joint" as
"stiffness of the diaphragm equivalent node". (5) On the same page 5, line 13 to line 14, correct
that "the stiffness of the vibration node is not uniform" because "it is difficult for the
hemispherical dome diaphragm to degenerate". (6) On page 11, line 13, delete "Vibration node".
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