JP2004007364

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 JP2004007364
The present invention relates to a suspension of an acoustic conversion device used for an
acoustic device and an acoustic conversion device using the same, and it is possible to improve
the linearity of the compliance of the suspension and to provide an excellent acoustic conversion
device. It is a thing. SOLUTION: A plurality of roll portions 1b each having a roll shape in cross
section are disposed adjacent to each other on the basis of a straight line connecting two outer
points, so that the roll portion 1b disposed first and the roll portion 1b disposed last are adjacent.
Form the suspension 1a by connecting the adjacent boundaries 2 of the roll portions 1b with a
continuous three-dimensional curved surface, improving the linearity of compliance, distortion,
and rolling. By providing the suspension 1a in which the occurrence is suppressed, it is possible
to provide an excellent electroacoustic transducer. [Selected figure] Figure 1
Suspension and electro-acoustic transducer using the same
TECHNICAL FIELD [0001] The present invention relates to a suspension used for an apparatus
having a function of reproducing sound such as voice, music and sound, and an electro-acoustic
transducer using the same. 2. Description of the Related Art A conventional electroacoustic
transducer will be described with reference to FIGS. 8, 9 (a) and 9 (b). FIG. 8 is a cross-sectional
view of the electro-acoustic transducer, FIG. 9 (a) is a plan view of the same diaphragm, and FIG.
8 (b) is a cross-sectional view taken along the line F-F. According to the figure, reference numeral
6 is a diaphragm which generates air vibration, and this diaphragm 6 has an amplitude function
and a support function via a circumferentially uniform roll-shaped suspension 1 with a case
fixing portion 4 Is adhesively bonded to the housing 11 by the A voice coil 10 is coupled to the
diaphragm 6, and the voice coil 10 is disposed in a magnetic gap 9 of a magnetic circuit 8
formed of a plate 13, a magnet 14 and a yoke 15 formed at the center of the housing 11. There
is. Furthermore, a protector 12 for protecting the diaphragm 6 is bonded by an adhesive. The
12-05-2019
1
operation of the electrodynamic speaker configured as described above will be described below.
When current flows through the voice coil 10, the current is orthogonal to the magnetic field in
the magnetic gap 9, the driving force generated in the voice coil 10 is transmitted to the
diaphragm 6, and the suspension 1 transmits the voice coil 10 to the plate 13. , And acts as a
spring in the direction of vibration when the diaphragm 6 vibrates. When an alternating current
(voice signal) flows through the voice coil 10, the voice coil 10 and the diaphragm 6 vibrate
while being supported by the suspension 1, so the air vibrates and a compression wave is
generated to sound as a sound. As prior art document information related to the invention of this
application, for example, Patent Document 1 is known. [Patent Document 1] Japanese Patent
Application Laid-Open No. 5-103395 As a first problem with the above-described conventional
configuration, the conventional suspension rotates uniformly in the circumferential direction.
Since it is a closed structure with a body shape, the diameter of the point P changes by Δr when
the suspension vibrates by ΔX when considering an arbitrary point P, as shown in the
suspension cross sectional view at the time of vibration in FIG. The force is generated in the
circumferential direction. This force is more likely to occur during large amplitude vibration, and
as shown in A of a force-displacement characteristic diagram shown in FIG.
The non-linearity of the compliance of the supporting force due to the shape of the suspension 1
causes a problem, particularly in the reproduction of a low-pitched sound region where the
amplitude becomes large, and causes distortion. Due to these phenomena, it is difficult to
maintain the compliance of the suspension, and harmonic distortion occurs in the sound pressure
frequency characteristics. In addition, deformation of the suspension is also induced, which
causes the rolling phenomenon of the diaphragm due to the deformation. The present invention
solves the above-mentioned conventional problems, has very little distortion given to acoustic
characteristics due to excellent compliance linearity, and has a support function suitable for large
amplitude that can suppress rolling induced by deformation. It is an object of the present
invention to provide an electro-acoustic transducer which can provide a suspension and expand
the low-range reproduction band by lowering the lowest resonance frequency even if the
suspension is made of the same material and thickness as conventional. In order to solve the
above problems, the present invention has the following constitution. According to a first aspect
of the suspension of the present invention, a plurality of roll portions having a roll shape in cross
section are disposed side by side on the basis of a straight line connecting two points of the inner
circumference or the outer circumference, and first arranged. The closed loop shape is
configured such that the roll portion and the last arranged roll portion are adjacent to each other,
and the adjacent boundary portions of each roll portion are connected by a continuous threedimensional curved surface to form a suspension. It is possible to improve the linearity and to
provide a suspension in which the occurrence of distortion and rolling is suppressed. According
to a second aspect of the suspension of the present invention, a plurality of roll portions having a
roll shape in cross section are radially adjacent to each other at regular intervals based on a
straight line connecting two points on the inner or outer circumference. A closed loop shape is
12-05-2019
2
configured such that the first arranged roll portion and the last arranged roll portion are
adjacent, and the adjacent boundary portions of each roll portion are connected by a continuous
three-dimensional curved surface to form a suspension. It is possible to improve the linearity of
compliance and to provide a suspension in which the occurrence of distortion or rolling is
suppressed. According to a third aspect of the suspension of the present invention, in the first or
second aspect, the inner periphery is joined to the closed loop-shaped roll portion, and the noncontinuous portion is It trims and forms a suspension, and joining of a roll part and inner
circumference is made to control generation ¦ occurrence ¦ production of distortion etc. by trim.
According to a fourth aspect of the suspension of the present invention, in the first or second
aspect, the outer periphery is joined to the closed loop-shaped roll portion, and the noncontinuous portion is trimmed. Thus, the suspension is formed, and the connection between the
roll portion and the inner periphery is trimmed to suppress the occurrence of distortion and the
like. According to a fifth aspect of the suspension of the present invention, an odd number of roll
portions of the suspension according to the first or second aspect are provided, and By making
the positional relationship of (1) asymmetrical, the occurrence of rolling at the time of driving
when incorporated into the electroacoustic transducer is prevented. In the suspension according
to the sixth aspect of the present invention, the suspension according to the first aspect or the
second aspect is disposed two sheets vertically, and the suspension according to the seventh
aspect is characterized by One of the disposed suspensions is shifted in the circumferential
direction around the axis by a half rotation of the roll part size, which prevents the occurrence of
rolling at the time of driving when incorporated in the electroacoustic transducer. . The upper
and lower suspensions according to the sixth or seventh aspect of the invention may be either
symmetrical or asymmetrical. According to an eighth aspect of the suspension of the present
invention, the suspension according to the first or second aspect is incorporated in an
electroacoustic transducer, and the occurrence of distortion or rolling is suppressed. It is possible
to provide an electroacoustic transducer. BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the suspension of the present invention will be described with
reference to FIGS. 1 to 7 (b). In the description, the same parts as in the prior art will be assigned
the same reference numerals and explanations thereof will be omitted. First Embodiment An
embodiment of the present invention will be described with reference to FIGS. FIG. 1 (a) is a plan
view of an embodiment of a suspension according to the present invention, FIG. 1 (b) is a
sectional view taken along the line A-A, and FIG. 2 (a) is a perspective view thereof. 2 (b) is an
enlarged sectional view taken along the line B-B in the perspective view, FIG. 2 (c) is an enlarged
sectional view taken along the line C-C in the perspective view, and FIG. 3 is an electroacoustic
conversion using the same suspension. FIG. 4 is a cross-sectional view of the device, FIG. 4 is a
force-displacement characteristic view at the time of amplitude of the suspension, and FIG. 5 is a
cross-sectional view for explaining the state at the time of amplitude of the suspension. The
present embodiment mainly describes claims 1 to 5 and claim 8.
12-05-2019
3
According to FIG. 1, in the suspension 1 a, a plurality of roll portions 1 b in which the joint
portion 3 with the housing fixing portion 4 and the vibration system fixing portion 5 is a straight
line are radially adjacently arranged around the diaphragm 6. The adjacent boundaries 2 of each
roll 1b are connected by a continuous three-dimensional curved surface so that there is no break,
and there is no continuity of the junction 3 with the housing fixing portion 4 and the vibration
system fixing portion 5 The part consists of a trimmed closed loop shape. In addition, since the
plan view of the vibrating surface is configured by a circle, an ellipse, a rectangle, a polygon such
as a rectangle, etc., the size and the arrangement of the roll portion 1b are not specified. When
the roll portions 1 b have the same shape, the roll portions 1 b are arranged at a constant
interval to form a closed loop shape. Then, adjacent boundaries 2 of each roll 1 b are
continuously connected by a three-dimensional curved surface so as not to be interrupted, and a
portion without continuity between the case fixing portion 4 and the joint portion 3 with the
vibration system fixing portion 5 is The outer peripheral portion is fixed to the housing 11 by the
housing fixing portion 4, and the inner peripheral portion is joined and supported to the
diaphragm 6 or the voice coil 10 by the vibration system fixing portion 5. Since the joint portion
3 of each roll portion 1b is formed by a straight line, no lateral force is generated due to the
generation of Δr in FIG. 5, but the adjacent roll portion 1b is formed by deformation of the roll
shape at the time of amplitude. The stress generated at the boundary between them and the
boundary 2 is absorbed, and as shown by B in the force-displacement characteristic chart at the
time of large amplitude shown in FIG. 4, excellent linearity of compliance to large amplitude is
obtained and unnecessary resonance It can be suppressed. Further, since the gap between the
roll portions 1 b is filled with the boundary portion 2, dustproofing to the magnetic gap 9 is also
possible. Further, the cross-sectional shape of the boundary portion 2 between the roll portions 1
b is not limited to a mere roll shape as shown in FIG. 2 (C). Further, the case fixing portion 4
which is a joint portion between the straight portion at the outer end of the roll portion 1 b and
the case 11 is trimmed and formed continuously so as to be fixed to the case 11. Further, the
vibration system fixing portion 5 which is a joint portion between the straight portion at the
inner end of the roll portion 1 b and the diaphragm 6 is trimmed and formed continuously to
form the diaphragm 6 or the voice coil 10. Fix to In the present embodiment, the number of roll
portions 1 b is an odd number. As a result, it is possible to maintain the stability of the amplitude,
to prevent the deformation of the suspension 1a causing the rolling phenomenon, and to reduce
the distortion given to the acoustic characteristics.
Further, by forming the suspension 1 a by heat molding of a polymer resin film or a
thermoplastic elastomer film or by injection molding of a resin, molding of a complicated shape
is facilitated, and further, the diaphragm 6 and Integral molding is also possible, which makes it
possible to reduce the number of manufacturing steps. Further, this suspension 1a is resin
impregnated with resin fiber and woven one using vegetable fiber or chemical fiber or both and
press molded, or polyurethane foam formed by mixing isocyanate and polyol and foaming by
12-05-2019
4
chemical reaction Deformation prevention and maintenance of linearity of compliance can be
achieved by using a thermoformed sheet of a body slice sheet or an uncured composition such as
NBR, SBR, and EPDM vulcanized and cured by heat pressing. It is possible. Although the
suspension 1a is described as being connected to the diaphragm 6 in the above embodiment, it
may be bonded and bonded to the voice coil 10. In the above embodiment, the roll portion 1b is
described as being formed on the basis of a straight line connecting two points on the outer
periphery, but may be formed on the basis of a straight line connecting two points on the inner
periphery It is a thing. Second Embodiment Another embodiment of the suspension of the
present invention will be described with reference to FIGS. 6 (a) and 6 (b) and FIGS. 7 (a) and 7
(b). FIG. 6 (a) is a plan view of another embodiment of the suspension, and FIG. 6 (b) is a crosssectional view taken along the line DD of FIG. 6 (a). Only differences from the first embodiment
will be described with reference to FIG. 1. The suspensions 1c and 1d are suspensions having the
same shape as the suspension 1a, and are adhesively bonded to the voice coil 10 at a distance
above and below. The suspension 1 c may be formed by adhesive bonding or integral molding
with the diaphragm 6. FIG. 7 (a) is a plan view of another embodiment of the suspension, and FIG.
7 (b) is a cross-sectional view taken along the line EE of FIG. 7 (a). The two suspensions 1c and
1d have the same shape as the suspension 1a, and have a positional relationship in which the
width L of the roll portion is shifted by approximately 1⁄2 in the rotational direction
(circumferential direction). Furthermore, the orientations of the suspensions 1c and 1d bonded
together by bonding the upper and lower sides of the voice coil 10 may be the same or the
opposite direction. With the above configuration, the rigidity of the suspension is enhanced and
rolling is suppressed. To be more effective.
Although the upper suspension 1 c is described as being bonded and bonded to the diaphragm in
the above embodiment, it may be bonded to the voice coil 10. As described above, according to
the present invention, excellent compliance linearity can be obtained by dividing the stress in the
circumferential direction generated inside into individual pieces, which are given to acoustic
characteristics. It is possible to provide a suspension with a support function suitable for large
amplitude that has very little distortion and can suppress the induction of rolling due to
deformation, and even when configured with the same material thickness as before, the lowest
resonance frequency is lowered and the bass range An electro-acoustic transducer capable of
realizing a reproduction band expansion is provided. BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1A is a plan view of a suspension according to a first embodiment of the present invention,
and FIG. 2B is a cross-sectional view along the line A-A of FIG. (B) An enlarged sectional view
taken along the line B-B (c) An enlarged sectional view taken along the line C-C. FIG. 3 is a
sectional view of an electroacoustic transducer using the suspension according to the first
embodiment of the present invention. Fig. 4 is a force-displacement characteristic diagram of the
same suspension at the time of amplitude. Fig. 5 is an explanatory diagram of a state of the same
suspension at the time of amplitude. Fig. 6 (a) a plan view of the suspension according to another
embodiment of the present invention b) A cross-sectional view taken along the line DD of FIG. 7
12-05-2019
5
(a) A plan view of a suspension according to another embodiment of the present invention (b) A
cross-sectional view taken along the line EE of FIG. Sectional view [Fig. 9] (a) Suspen which is the
main part (B) Cross-sectional view taken along the line F-F [Reference] 1a Suspension 1b Roll 1c
Suspension 1d Suspension 2 Boundary 2 Junction 3 Junction 4 Housing Fixation 5 Vibration
System Fixation 6 Vibration Plate 8 Magnetic Plate Circuit 9 Magnetic gap 10 Voice coil 11 Case
12 Protector
12-05-2019
6