close

Вход

Забыли?

вход по аккаунту

?

JP2003092795

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 JP2003092795
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
suspension structure such as a speaker, and more particularly to a suspension structure for
electroacoustic conversion capable of outputting a large sound and an electroacoustic
transducer.
[0002]
2. Description of the Related Art There is known a thin speaker in which a diaphragm is made
circular or elliptical in a speaker or the like attached to a television or the like. It is desirable for
the magnetic circuit of the speaker to apply a uniform magnetic flux to the coil surface of the
cylindrical voice coil, so that it is generally configured to be entirely cylindrical using a donut
circular top plate, magnet, etc. It is The magnetic circuit in the thin speaker is configured such
that the outer diameter thereof is approximately the same as or smaller than the width of the
frame supporting the diaphragm, whereby the entire speaker device is compactly integrated. The
structure is On the other hand, the performance of the speaker depends on the area of the
diaphragm, and a speaker with high performance and a large sound can be realized as the area is
larger.
[0003]
13-05-2019
1
However, in the conventional speaker, the area of the diaphragm is not effectively used because
the diaphragm is circular or elliptical. That is, in general, in a speaker or the like attached to a
television or the like, even if the diaphragm is circular or elliptical, the periphery is generally
rectangular. Therefore, a circular or elliptical diaphragm is formed inside the rectangle, and the
area of the four corners of the rectangle is not effectively used.
[0004]
As a speaker for solving such a problem, there is a speaker having an edge roll as shown in FIG.
FIG. 5 is a view of an edge roll and a diaphragm, and in a speaker having such an edge roll, as
shown in FIG. 5, the diaphragm is made rectangular to effectively utilize the area of four corners
in order to solve the above problems. Speaker. The structure of FIG. 5 will be described below.
[0005]
In FIG. 5, FIG. 5 (a) is a view from above of a rectangular diaphragm 2 and a rectangular edge roll
1 supporting it, and FIG. 5 (b) is a sectional view taken along the line AA of FIG. 5 (a). FIG. 5C is a
partial cross-sectional view in the BB direction of FIG. 5A. The rectangular edge roll 1 has a
wedge-shaped cross section, and the diaphragm 2 is supported by one flange portion 1 d formed
inside the edge roll 1. As shown in FIG. 5 (b), the diaphragm 2 is formed with a spherical portion
whose central portion is convex downward, and vibrates vertically (in the Y1 and Y2 directions).
[0006]
In the wedge-shaped rectangular edge roll 1, the sides 1b of the rectangle and the corners 1c of
the sides are arcs of uniform height. The other collar 1a formed on the outer side of the collar is
fixed to a frame that holds the rectangular edge roll 1 (not shown). When current flows through a
voice coil (not shown) and the diaphragm 2 vibrates due to the current and the magnetic circuit
(not shown), it is formed inside the edge roll 1 supporting the diaphragm 2. One collar portion 1d
is also vibrated with the other collar portion 1a formed on the outer side of the edge roll 1 as a
fulcrum.
[0007]
13-05-2019
2
FIG. 6 is an enlarged view of a portion of FIG. 5 (c). As apparent from FIG. 6, when the diaphragm
2 vibrates up and down, tension in the P direction is generated in the edge roll 1, and the ridge
1d on the inner side of the edge roll 1 is pulled inward. In such a case, the other flange 1a
formed on the outer side of the edge roll 1 is fixed to a frame (not shown), so that the height of
the arc of the ridge is reduced. The magnitude of the deformation depends on the magnitude of
the tension acting on the edge roll 1.
[0008]
On the other hand, as described above, each side 1b of the rectangle and the corner portion 1c of
each side are in the form of a circular arc having a uniform height, as is apparent from FIGS. 5 (b)
and 5 (c). The distance between the ridge 1d on the inner side of the edge roll 1 is long at the
corner 1c, and the above-mentioned tension largely acts on the corner 1c. However, since the
ridges have uniform height on each side 1b of the rectangle and the corner portions 1c on each
side, as shown in FIG. 5C, when the corner portion 1c receives a strong tension, the ridges of the
edge roll 1 The reaction force acting on the mold portion is stronger at the corner portion 1c
than at each side 1b. Therefore, the corner portion 1 c acts to pull the diaphragm 2 back to the
edge roll 1 more strongly than each side 1 b.
[0009]
SUMMARY OF THE INVENTION As described above, in the above-mentioned conventional
loudspeaker, the amplitude of the vibration system is greatly influenced by the structure of the
edge roll 1 having a wedge-shaped cross section. That is, since each side 1b of the edge roll 1
and the corner portion 1c of each side have an arc shape with uniform height, the tension of the
diaphragm at the corner portion 1c is strong, and the amplitude of the whole diaphragm is
limited. . As a result, there is a problem in that it is difficult to design a large volume input and
high linearity since a large amplitude of the vibration system can not be secured.
[0010]
The present invention solves such problems and secures a large amplitude of a vibration system
such as a diaphragm, etc., and is for electro-acoustic conversion that achieves excellent linearity
of frequency characteristics and high input resistance. It is an object of the present invention to
provide a suspension structure and an electroacoustic transducer.
13-05-2019
3
[0011]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
comprises an edge roll for supporting a rectangular diaphragm in the suspension structure for
electroacoustic conversion according to the first aspect of the present invention. The edge roll is
rectangular, and shock absorbing parts for facilitating vibration of a diaphragm provided inside
the edge roll are formed differently in the shape of the shock absorbing part on each side of the
rectangle and the shock absorbing part in the corner. It is characterized by
[0012]
In the suspension structure for electro-acoustic conversion according to the second aspect, each
side of the edge roll has a wedge shape in cross section, and one wedge portion for supporting
the diaphragm is formed inside the wedge. The other side of the ridge is formed by fixing the
edge roll to the frame, and the buffer portion is formed in an arc shape at each corner of the
edge roll of the ridge, and the buffer portion is formed. It is characterized in that the height of the
arc at the corner to be formed is higher than the height of the arc of each side.
[0013]
In the suspension structure for electro-acoustic conversion according to the third aspect, each
side of the edge roll has a wedge-shaped cross-sectional shape, and the height of the arc of the
wedge-shaped edge roll is from the middle of each side The height of the arc at each corner of
each side is higher than the height of the arc at each side.
[0014]
In the electro-acoustic transducer according to the fourth aspect, a diaphragm formed in a
rectangular shape, a cylindrical voice coil attached to the center of the diaphragm, and a
rectangular edge roll for supporting the diaphragm. And a frame for holding the edge roll and a
magnetic circuit acting on the voice coil, wherein the edge roll has a wedge-shaped cross section
and facilitates vibration of a diaphragm provided inside the edge roll. Are formed differently in
the shape of the buffer on each side of the rectangle and the buffer at the corner, and one ridge
supporting the diaphragm is formed on the inside of the edge roll The other edge of the edge roll
to which the edge roll is fixed to the frame is formed outside the edge roll, and the chord side of
the wedge-shaped cross-sectional shape of the edge roll is arranged to face the frame The
diaphragm is supported by one of the ridges formed inside the edge roll, and the other ridge
formed outside the edge roll is fixed to the frame. Do.
[0015]
13-05-2019
4
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will
be described with reference to FIG.
In the following description, the same parts as in FIG. 5 are given the same reference numerals.
FIG. 1 is a side sectional view of an embodiment of the electroacoustic transducer in the present
invention.
A cylindrical magnet 8 is sandwiched between a circular upper plate 9 and a cylindrical lower
plate 4 to form a magnetic circuit.
A frame 3 is bonded to the upper portion of the lower plate 4 with an adhesive or the like.
The lower plate 4 and the upper plate 9 are, for example, a magnetic material such as iron, and
the frame 3 is, for example, a resin, a metal material or the like.
[0016]
Further, a diaphragm 2 supported by the edge roll 1 is provided at the top of the frame 3. The
bobbin 7 around which the voice coil 5 for driving the diaphragm 2 is wound is in close contact
with the lower portion (convex portion side) of the diaphragm 2. The intermediate portion is
centrally held by a spring-like damper 6. The voice coil 5 and the bobbin 7 are integrated so as to
be vibrated together with the diaphragm 2 around the magnet 8 and the upper plate 9. The edge
roll 1 is, for example, a material such as urethane, rubber or cloth, the diaphragm 2 is, for
example, paper, metal, cloth, synthetic resin, and the bobbin 7 is, for example, paper, cloth,
synthetic resin or the like.
[0017]
The edge roll 1 and the diaphragm 2 supported thereon are rectangular (rectangular or square),
13-05-2019
5
and the edge roll 1 has good adhesion to the frame 3 and the edge roll 1, for example, a rubberbased adhesive It is fixed to the frame 3 with an agent. The lower plate 4 has a cylindrical shape
having a size in which the voice coil 5 and the bobbin 7 are movably disposed. The lower plate 4
is fitted in and integrated with a through hole (not shown) formed in the lower portion of the
frame 3.
[0018]
FIG. 2 is a view of the rectangular diaphragm 2 and the rectangular edge roll 1 for supporting the
same, and FIG. 2 (a) is a view from the top, and FIG. 2 (b) is a view. 2A is a cross-sectional view
taken along the line AA of FIG. 2A, and FIG. 2D is a partial cross-sectional view taken along the
line BB shown in FIG. 2A. FIG. 3 is an enlarged view of a part of FIG. 2 (d).
[0019]
In FIG. 2, the difference from FIG. 5 is as follows, and the description of the other same parts is
omitted. Here, the height of the arc and the length of the chord are defined as follows. That is, as
shown in FIG. 4, the height of the arc is the height on the center line CC of the arc of the edge roll
1 and is the value of the position where the height of the arc becomes maximum. Further, the
chord length of the arc is the value of the linear distance Wn (n is an integer) at both ends of the
wedge to the two ridges formed at both ends of the wedge of the edge roll 1. The rectangular
edge roll 1 has a wedge-shaped cross section, and the height H2 of the arc of the corner portion
1c of the wedge-shaped edge roll 1 is formed to be higher than the height H1 of the arc of each
side 1b There is. Furthermore, the height of the circular arc increases in the direction of the
corner portion 1c from the middle of each side 1b, and the height H2 of the circular arc at the
corner portion 1c is formed higher than the height H1 of the circular arc at the side 1b It is.
[0020]
As described above, the shape of the corner portion 1c of the edge roll 1 is different from that of
the prior art. Hereinafter, the shape of the corner portion 1c will be described with reference to
FIG. 2 and FIG. The edge roll 1 has a rectangular shape, and portions 1b corresponding to each
side thereof are arcs having a fixed height H1. Then, the height of the arc gradually increases
from the middle a of each side 1b, and the height becomes maximum at the center b of the
corner 1c. The shape is identical in all the sides 1b and the corners 1c.
13-05-2019
6
[0021]
That is, as shown in FIG. 2 (c), the height of the arc of the portion 1b corresponding to each side
is low, and the arc length is also short. Furthermore, as shown in FIG. 2D, the height of the arc of
the corner 1c is high, and the arc length is also longer than the arc length of the portion 1b
corresponding to each side. The point which concerns is the same as FIG. However, as is
apparent from the enlarged view of the part a in FIG. 2D shown in FIG. 2D, the height H2 of the
arc at the corner 1c of each side 1b is higher than the height H1 of the arc at each side 1b. It is
formed high.
[0022]
FIG. 4 is a view for explaining the shape of the corner portion 1c in the edge roll 1. FIG. 4 (a) is
an enlarged view of the corner portion 1c in the edge roll 1, FIG. 4 (b), FIG. (C), FIG.4 (d), and
FIG.4 (e) are figures which each show the shape of the circular arc in the corner part 1c. In FIG.
4A, the portions where the height of the arc of the portion 1b corresponding to each side of the
edge roll 1 starts to change are taken as Q1-R1 line and Q5-R5 line shown in FIG. Let R4 be a
point where a straight line drawn from the point of intersection P1 to the Q1-R1 line at an angle
of 45 degrees intersects the ridge 1a outside the edge roll 1 and Q4 be a point where it intersects
the inner ridge 1d.
[0023]
A point where a straight line drawn from the intersection point P1 to the Q1-R1 line at an angle
θ intersects the ridge 1a on the outer side of the edge roll 1 with Rn (n is an integer) and a point
on the inner ridge 1d Let Q n be an integer. Let Cn (n is an integer) be a point at which each of
the straight lines intersects the center line CC of the arc.
[0024]
It is determined that the heights of the arcs increase from the Q1-R1 line and the Q5-R5 line
toward the R4-Q4 line as follows. For example, in FIG. 4B, when the height of the arc in the Q1-
13-05-2019
7
R1 line is “1” and the length of the chord is “3.5”, the angle θ from the intersection point
P1 to the Q1-R1 line is FIGS. 4 (c), 4 (d), and 4 (e) are diagrams showing the height of the arc and
the length of the chord, as viewed from the intersection point P1 at 10 degrees, 30 degrees, and
45 degrees.
[0025]
As is apparent from the figures of FIG. 4, the height of the arc and the length of the chord
increase as the angle θ increases and is maximum when θ = 45 degrees. Similarly, it decreases
as the angle θ increases from 45 degrees, and becomes equal to the height “1” of the arc in
the Q5-R5 line and the length “3.5” of the chord at θ = 90 degrees. Although FIG. 4 illustrates
a part of the corner portions of the edge roll 1, the same applies to all the corner portions, and
the description will be omitted.
[0026]
In FIG. 4, although described as W1 = W2, it may be other than this. That is, the chord lengths
W1, W2, W3, and W4 of the edge roll 1 at each side are determined according to the size and the
material or shape (for example, a rectangle) of the edge roll 1, the material of the diaphragm 2,
the volume of the speaker, etc. The chord lengths W1 and W3 of the edge roll 1 at the sides
facing each other, and the chord lengths W1 and W3 of the edge roll 1 at the sides near each
other, where W2 and W4 are equal, W2 and W4 may be different from each other.
[0027]
Furthermore, according to the size and material or shape (for example, rectangular) of the edge
roll 1, the material of the diaphragm 2, the volume of the speaker, etc., the height of the arc
increasing in the direction of the corner 1c from the middle of each side 1b. The height may
increase from the center of each side.
[0028]
The operation of the electroacoustic transducer shown in FIG. 1 will be described.
13-05-2019
8
The other ridge 1a of the edge roll 1 is fixed to a frame 3 for holding the rectangular edge roll 1.
A current is supplied to the voice coil 5, and the voice coil 5 is wound by the current and the
magnetic circuit configured by sandwiching the cylindrical magnet 8 by the circular upper plate
9 and the cylindrical lower plate 4. The bobbin 7 vibrates up and down. The bobbin 7 is in close
contact with the lower portion (convex portion side) of the diaphragm 2, and the diaphragm 2 is
also vertically vibrated by the vertical movement of the bobbin 7.
[0029]
When the diaphragm 2 is vibrated, one flange portion 1 d formed on the inside of the edge roll 1
supporting the diaphragm 2 is also formed on the outside of the edge roll 1. It vibrates with the
heel part 1a as a fulcrum.
[0030]
As shown in FIGS. 2 (c) and 2 (d), when the diaphragm 2 is vibrated up and down, tension in the
P direction is generated in the edge roll 1, and the inside of the edge roll 1 is generated. Buttocks
1d are pulled inward.
In such a case, since the other flange 1a formed outside the edge roll 1 is fixed to the frame 3, it
is deformed so that the height of the arc becomes low. The magnitude of the deformation
depends on the magnitude of the tension acting on the edge roll 1.
[0031]
On the other hand, as described above, the height H2 of the arc at the corner of each side of the
edge roll is higher than the height H1 of the arc of each side, as shown in FIG. 4 (b), FIG. 4 (c),
and FIG. As shown in FIG. 4 (d) and FIG. 4 (e), the height of the arc and the length of the chord
increase as the angle θ increases. That is, the distance between the ridges 1 d on the inner side
of the edge roll 1 is the longest at θ = 45 degrees, and the corners concerned are subjected to
the highest tension. On the other hand, each part concerned has the highest height of the arc and
the longest chord length. Therefore, even at the corners of θ = 45 degrees, even with the
strongest tension, there is the most extra power to stretch the string.
[0032]
13-05-2019
9
When the angle θ is 45 degrees or less, the height of the arc and the length of the chord
decrease, but the tension also decreases accordingly. Therefore, the reaction force of the edge
roll 1 with respect to the diaphragm 2 is made uniform around the diaphragm 2. As a result, the
diaphragm 2 is not restricted in the amplitude of the entire diaphragm 2 at the corners of the
edge roll 1.
[0033]
According to the suspension structure for electroacoustic conversion of the first to third aspects,
the amplitude of the rectangular diaphragm can be secured large, and the linearity of the
frequency characteristic is excellent. It is possible to realize an electroacoustic transducing
suspension structure which is designed to have high rigidity and high input resistance.
[0034]
According to the electro-acoustic transducer of the fourth aspect, it is possible to realize a small,
thin speaker having excellent linearity of frequency characteristics and high input resistance.
[0035]
Brief description of the drawings
[0036]
1 is a side sectional view of an embodiment of the electro-acoustic transducer in the present
invention.
[0037]
Fig. 2 is a view of a rectangular diaphragm and a rectangular edge roll supporting the diaphragm,
wherein Fig. 2 (a) is a view from the top, and Fig. 2 (b) is a partial cross-sectional view of Fig. 2
(a) FIG. 2 (c) is a cross-sectional view taken along line AA of FIG. 2 (a), and FIG. 2 (d) is a partial
cross-sectional view taken along line BB of FIG. 2 (a).
[0038]
3 is an enlarged view of a portion of FIG. 2 (d).
13-05-2019
10
[0039]
4 is a diagram for explaining the shape of the corner in the edge roll.
[0040]
Fig. 5 is a view of an edge roll and a diaphragm of a speaker using a conventional edge roll, and
Fig. 5 (a) is a view of a rectangular diaphragm and a rectangular edge roll supporting the same
from above, Fig. 5 (b) is a cross-sectional view taken along line AA of FIG. 5 (a), and FIG. 5 (c) is a
partial cross-sectional view taken along line BB of FIG. 5 (a).
[0041]
6 is an enlarged view of a part of FIG. 5 (c).
[0042]
Explanation of sign
[0043]
1 edge roll 2 diaphragm 3 frame 4 lower plate 5 voice coil 6 damper 7 bobbin 8 magnet 9 upper
plate
13-05-2019
11
Документ
Категория
Без категории
Просмотров
0
Размер файла
21 Кб
Теги
jp2003092795
1/--страниц
Пожаловаться на содержимое документа