JP2004007364A - Suspension and electroacoustic transducer using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excellent electroacoustic transducer by improving linearity of compliance of a suspension with respect to the suspension for an acoustic transducer to be used for acoustic equipment and the acoustic transducer using the same. <P>SOLUTION: A plurality of roll parts 1b whose cross sections has a rolled shape are located side by side with a straight line which connects two points on an outer periphery as a reference, a closed loop is formed to make adjacent the first located roll part 1b and the finally located roll part 1b, and a suspension 1a is provided for suppressing occurrence of distortion or rolling by improving linearity of compliance so that the excellent electroacoustic transducer is provided. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a suspension used for a device having a function of reproducing sounds such as voice, music, and dial tone, and an electroacoustic transducer using the same.
[0002]
[Prior art]
A conventional electroacoustic transducer will be described with reference to FIGS. 8, 9A and 9B.
[0003]
FIG. 8 is a cross-sectional view of the electro-acoustic transducer, FIG. 9A is a plan view of the diaphragm, and FIG. According to the drawing, reference numeral 6 denotes a diaphragm for generating air vibration, and the diaphragm 6 is provided with a housing fixing portion 4 via a circumferentially uniform roll-shaped suspension 1 having an amplitude function and a supporting function. Is adhesively bonded to the housing 11. 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 including a plate 13, a magnet 14, and a yoke 15 formed at the center of a housing 11. I have.
[0004]
Further, a protector 12 for protecting the diaphragm 6 is bonded with an adhesive.
[0005]
The operation of the electrodynamic loudspeaker configured as described above will be described below.
[0006]
When a current is applied to 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 moves the voice coil 10 concentrically with the plate 13. And acts as a spring in the vibration direction when the diaphragm 6 vibrates. When an alternating current (audio signal) is applied to the voice coil 10, the voice coil 10 and the diaphragm 6 vibrate while being supported by the suspension 1, so that the air vibrates, a compression wave is generated, and the sound is heard.
[0007]
For example, Patent Document 1 is known as prior art document information related to the invention of this application.
[0008]
[Patent Document 1]
JP-A-5-103395
[Problems to be solved by the invention]
As a first problem with the above-mentioned conventional configuration, the conventional suspension has a structure in which the conventional suspension is closed in the circumferential direction with a uniform rotating body shape. Therefore, as shown in a suspension cross-sectional view at the time of vibration in FIG. Considering the point P, when the suspension vibrates by ΔX, the diameter of the point P changes by Δr, and a force is generated in the circumferential direction. This force is more likely to be generated during large-amplitude vibration, and the compliance becomes non-linear at large-amplitude as shown in A of a force-displacement characteristic diagram shown in FIG.
[0010]
The non-linearity of the compliance of the supporting force due to the shape of the suspension 1 becomes a problem particularly at the time of reproduction in a low-frequency range where the amplitude becomes large, and causes distortion.
[0011]
Due to these phenomena, it becomes difficult to maintain the compliance of the suspension, and harmonic distortion occurs in the sound pressure frequency characteristics. Further, there is a problem that the deformation of the suspension is also induced, and the rolling phenomenon of the diaphragm is caused by the deformation.
[0012]
The present invention solves the above-mentioned conventional problems, and provides a suspension having a support function suitable for a large amplitude that can suppress the induction of rolling due to deformation with very little distortion to acoustic characteristics due to excellent linearity of compliance. It is another object of the present invention to provide an electro-acoustic transducer that can realize a low-frequency range reproduction band expansion by lowering the lowest resonance frequency even if the electro-acoustic transducer is formed of the same material and material thickness as in the related art.
[0013]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following configurations.
[0014]
The suspension according to claim 1 of the present invention is arranged such that a plurality of roll portions having a cross-sectional shape are arranged adjacent to each other with reference to a straight line connecting two points of an inner circumference or an outer circumference, and a roll portion arranged first. The rolls arranged last form a closed loop shape that is adjacent to each other, and the adjacent boundaries of each roll are connected by a continuous three-dimensional curved surface to form a suspension, and the linearity of compliance is improved. This makes it possible to provide a suspension with improved distortion and reduced rolling.
[0015]
Further, the suspension according to claim 2 of the present invention is arranged such that a plurality of roll portions having a cross-sectional shape in a roll shape are radially adjacent to each other at a constant interval with reference to a straight line connecting two points of an inner circumference or an outer circumference, The first placed roll and the last placed roll form a closed loop shape, and the adjacent boundaries of each roll are connected by a continuous three-dimensional curved surface to form a suspension. In addition, it is possible to provide a suspension that improves the linearity of compliance and suppresses the occurrence of distortion and rolling.
[0016]
The suspension according to the third aspect of the present invention is the suspension according to the first or second aspect, in which the inner periphery is joined to a roll portion having a closed loop shape, and the discontinuous portion is trimmed. A suspension is formed, and the joint between the roll portion and the inner periphery is trimmed to suppress the occurrence of distortion or the like.
[0017]
According to a fourth aspect of the present invention, there is provided the suspension according to the first or second aspect, wherein an outer periphery is joined to a roll portion having a closed loop shape, and a discontinuous portion is trimmed. The trimming of the joint between the roll portion and the inner periphery is such that distortion and the like are suppressed.
[0018]
In the suspension according to the fifth aspect of the present invention, the suspension according to the first or second aspect has an odd number of roll portions, and a positional relationship with the roll portions facing in the circumferential direction. Is asymmetrical to prevent rolling during driving when incorporated in an electroacoustic transducer.
[0019]
In the suspension according to the sixth aspect of the present invention, two suspensions according to the first or second aspect are arranged vertically, and the suspension according to the seventh aspect is arranged vertically. In this case, one of them is displaced in the circumferential direction about the axis by 回 転 rotation of the roll portion size, thereby preventing the occurrence of rolling during driving when incorporated in the electroacoustic transducer.
[0020]
The upper and lower suspensions according to claim 6 or 7 may be symmetric or asymmetric.
[0021]
According to an eighth aspect of the present invention, there is provided an electroacoustic transducer in which the suspension according to the first or second aspect is incorporated in an electroacoustic transducer, and the electroacoustic transducer capable of suppressing the occurrence of distortion and rolling. The device can be provided.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a suspension according to the present invention will be described with reference to FIGS. 1 to 7B. In the description, the same parts as in the related art will be denoted by the same reference numerals, and description will be omitted.
[0023]
(Embodiment 1)
One embodiment of the present invention will be described with reference to FIGS. FIG. 1A is a plan view of an embodiment of the suspension of the present invention, FIG. 1B is a cross-sectional view taken along line AA, and FIG. 2A is a perspective view of the same. 2 (b) is an enlarged sectional view taken along line BB of the perspective view, FIG. 2 (c) is an enlarged sectional view taken along line CC of the perspective view, and FIG. 3 is an electroacoustic conversion using the suspension. FIG. 4 is a cross-sectional view of the apparatus, FIG. 4 is a force-displacement characteristic diagram of the suspension at the time of amplitude, and FIG. 5 is a cross-sectional view illustrating the state of the suspension at the time of amplitude.
[0024]
In this embodiment, claims 1 to 5 and claim 8 will be mainly described.
[0025]
According to FIG. 1, the suspension 1 a is such that a plurality of roll portions 1 b having a straight joint portion 3 with the housing fixing portion 4 and the vibration system fixing portion 5 are arranged radially adjacent to the periphery of the diaphragm 6. The adjacent boundary portions 2 of the roll portions 1b are connected by a continuous three-dimensional curved surface so as not to be interrupted, and a portion where there is no continuity of the joint portion 3 with the housing fixing portion 4 and the vibration system fixing portion 5 is trimmed. It has a closed loop shape. Further, since the plan view of the vibrating surface is constituted by a polygon such as a circle, an ellipse, a square, and a rectangle, the size and arrangement of the roll portion 1b are not specified.
[0026]
When the rolls 1b have the same shape, the rolls 1b are arranged at regular intervals and configured in a closed loop shape. The adjacent boundary portions 2 of the roll portions 1b are continuously connected by a three-dimensional curved surface so as not to be interrupted, and the portions where the housing fixing portion 4 and the joining portion 3 with the vibration system fixing portion 5 have no continuity are connected. 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.
[0027]
Since the joining portion 3 of each roll portion 1b is formed of a straight line, no lateral force is generated due to the occurrence of Δr in FIG. 5, but due to the deformation of the roll shape at the time of amplitude, the boundary between the adjacent roll portions 1b is generated. Is absorbed by the boundary portion 2, and excellent linearity of compliance is obtained up to a large amplitude as shown in B of the force-displacement characteristic diagram at the time of a large amplitude shown in FIG. 4, and unnecessary resonance can be suppressed. It is. Since the gap between the roll portions 1b is filled by the boundary portion 2, dust on the magnetic gap 9 can be prevented.
[0028]
Further, the cross-sectional shape of the boundary portion 2 between the roll portions 1b is not limited to a simple roll shape as shown in FIG.
[0029]
Further, the housing fixing portion 4, which is a joining portion between the straight portion at the outer end of the roll portion 1 b and the housing 11, is formed to be continuous by trimming and fixed to the housing 11.
[0030]
Further, the vibration system fixing portion 5 which is a joining portion between the linear portion at the inner end of the roll portion 1b and the diaphragm 6 is formed so as to be trimmed and continuous, and is fixed to the diaphragm 6 or the voice coil 10. .
[0031]
In the present embodiment, the number of roll portions 1b is odd. As a result, it is possible to maintain the stability of the amplitude, prevent the deformation of the suspension 1a that causes the rolling phenomenon, and reduce the distortion applied to the acoustic characteristics.
[0032]
The suspension 1a is made of a polymer resin film or a thermoplastic elastomer film by heat molding, or is made of resin by injection molding, thereby facilitating molding of a complicated shape. And the number of manufacturing steps can be reduced.
[0033]
Also, the suspension 1a is knitted using vegetable fibers or chemical fibers or both, woven and woven, and resin-impregnated and press-molded, or a polyurethane foam obtained by mixing isocyanate and polyol and foaming by a chemical reaction. It is possible to prevent deformation and maintain the linearity of compliance by using a thermoformed sheet or a non-vulcanized composition such as NBR, SBR, EPDM, etc. cured and cured by hot pressing. Things.
[0034]
Further, in the above embodiment, the suspension 1a has been described as being connected to the diaphragm 6, but the suspension 1a may be bonded to the voice coil 10.
[0035]
Further, in the above embodiment, the roll portion 1b is described as being formed based on a straight line connecting two points on the outer periphery, but may be formed based on a straight line connecting two points on the inner periphery. .
[0036]
(Embodiment 2)
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).
[0037]
FIG. 6 (a) is a plan view of another embodiment of the suspension, and FIG. 6 (b) is a cross-sectional view taken along the line DD of the suspension, which mainly describes claim 6.
[0038]
Only the differences from the first embodiment will be described with reference to the figure. Reference numerals 1c and 1d denote suspensions having the same shape as the suspension 1a, and are bonded to and separated from the voice coil 10 vertically. Note that the suspension 1c may be formed by adhesive bonding or integral molding with the diaphragm 6.
[0039]
FIG. 7 (a) is a plan view of another embodiment of the suspension, and FIG. 7 (b) is a sectional view taken along line EE of the suspension, which mainly describes claim 7. The two suspensions 1c and 1d have the same shape as the suspension 1a, and have a positional relationship of being shifted by about 1/2 of the width L of the roll portion in the rotation direction (circumferential direction).
[0040]
Further, the directions of the suspensions 1c and 1d, which are adhesively bonded above and below the voice coil 10, may be either the same or opposite directions. With the above configuration, the rigidity of the suspension is increased and the effect is suppressed by suppressing rolling. It shall be demonstrated.
[0041]
In the above embodiment, the upper suspension 1c has been described as being adhesively bonded to the diaphragm, but may be coupled to the voice coil 10.
[0042]
【The invention's effect】
As described above, according to the present invention, by dividing the circumferential stress generated inside into individual pieces, excellent linearity of compliance is obtained, the distortion given to the acoustic characteristics is extremely small, and Electro-acoustics that can provide a suspension with a support function suitable for large amplitude that can suppress the induction of rolling, and that can reduce the lowest resonance frequency and expand the bass reproduction band even if it is configured with the same material thickness as before A conversion device is provided.
[Brief description of the drawings]
1A is a plan view of a suspension according to a first embodiment of the present invention, FIG. 2B is a cross-sectional view taken along line AA of FIG. 2A, and FIG. 2A is a perspective view of a suspension according to the first embodiment of the present invention; FIG. 3 is a cross-sectional view of the electro-acoustic transducer using the suspension according to the first embodiment of the present invention. FIG. 4 is a cross-sectional view of the same suspension. FIG. 5 is an explanatory view of a state of the suspension at the time of amplitude. FIG. 6 (a) is a plan view of a suspension according to another embodiment of the present invention, and FIG. FIG. 7A is a plan view of a suspension according to another embodiment of the present invention. FIG. 7B is a cross-sectional view taken along the line EE. FIG. 8 is a cross-sectional view of a conventional electroacoustic transducer. a) Plan view of the suspension as the main part (b) FF A cross-sectional view DESCRIPTION OF SYMBOLS
1a Suspension 1b Roll 1c Suspension 1d Suspension 2 Boundary 3 Joint 4 Housing Fixing 5 Vibration System Fixing 6 Vibrating Plate 8 Magnetic Circuit 9 Magnetic Gap 10 Voice Coil 11 Housing 12 Protector

Claims (8)

A closed loop shape in which a plurality of roll portions having a cross-sectional shape are arranged next to each other on the basis of a straight line connecting two points of the inner circumference or the outer circumference, and the roll portion arranged first and the roll portion arranged last is adjacent to each other. A suspension in which the adjacent boundary portions of each roll portion are connected by a continuous three-dimensional curved surface. A plurality of roll portions having a cross-sectional shape are arranged radially adjacent to each other at a constant interval based on a straight line connecting two points of the inner circumference or the outer circumference, and the first roll portion and the last roll portion are adjacent to each other. A suspension that has such a closed loop shape, and the adjacent boundaries of the rolls are connected by a continuous three-dimensional curved surface. The suspension according to claim 1 or 2, wherein an inner periphery is joined to a roll portion having a closed loop shape, a portion having no continuity is trimmed, and a housing fixing portion fixed to the housing is provided on the outer periphery. 3. The suspension according to claim 1, wherein the outer periphery is joined to a roll portion having a closed loop shape, a portion having no continuity is trimmed, and a vibration system fixing portion for fixing a diaphragm or a voice coil is provided on the inner periphery. . The suspension according to claim 1 or 2, wherein an odd number of roll portions are provided. A suspension comprising the two suspensions according to claim 1 arranged vertically. 3. A suspension, wherein the two suspensions according to claim 1 or 2 are arranged vertically, and one of the suspensions is arranged by rotating one half of a roll portion size in a circumferential direction around one of the suspensions. The inner periphery is joined to a voice coil which fits into a magnetic gap of a magnetic circuit or an outer peripheral portion of a diaphragm connected to the voice coil, and the outer periphery is fixed to a housing holding the magnetic circuit and the vibration system. 3. An electroacoustic transducer including the suspension according to 2.

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