JP3600982B2 - Suspension structure for electroacoustic conversion and electroacoustic conversion device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a suspension structure for a speaker or the like, and more particularly to a suspension structure for electro-acoustic conversion and an electro-acoustic conversion device capable of outputting a large sound.
[0002]
[Prior art]
2. Description of the Related Art A thin speaker having a diaphragm formed into a circular or elliptical shape in a speaker or the like attached to a television or the like is known. It is desirable that the magnetic circuit of the speaker imparts a uniform magnetic flux to the coil surface of the cylindrical voice coil. Therefore, a speaker having a generally cylindrical shape using a donut-shaped top plate, a magnet, and the like is generally used. It is a target. The magnetic circuit of the thin loudspeaker is configured such that its outer diameter is substantially equal to or smaller than the width of the frame supporting the diaphragm in the minor diameter direction, whereby the entire loudspeaker device is compactly integrated. Configuration. On the other hand, the performance of the speaker depends on the area of the diaphragm, and the larger the area, the higher the performance and the size of the speaker for large sound.
[0003]
However, in the conventional speaker, since the diaphragm is circular or elliptical, the area of the diaphragm is not effectively used. 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, its 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 that solves such a problem, there is a speaker having an edge roll as shown in FIG. FIG. 5 is a diagram of an edge roll and a diaphragm, and a speaker having such an edge roll has a rectangular diaphragm as shown in FIG. Speaker. Hereinafter, the structure of FIG. 5 will be described.
[0005]
5A is a view of a rectangular diaphragm 2 and a rectangular edge roll 1 supporting the same, viewed from above, and FIG. 5B is a cross-sectional view taken along the line AA of FIG. 5A. 5C is a partial cross-sectional view in the BB direction of FIG. 5A. The rectangular edge roll 1 has a gutter-shaped cross section, and the diaphragm 2 is supported by one flange 1 d formed inside the edge roll 1. As shown in FIG. 5 (b), the diaphragm 2 has a spherical portion whose central portion is convex downward, so that the diaphragm 2 vibrates vertically (Y1, Y2 directions).
[0006]
In the trough-shaped rectangular edge roll 1, each side 1b and each corner 1c of the rectangle are formed in an arc shape having a uniform height. The other flange portion 1a formed on the outside of the gutter shape is fixed to a frame holding the rectangular edge roll 1 (not shown). When a current is applied to a voice coil (not shown) and the diaphragm 2 vibrates due to the current and a magnetic circuit (not shown), the diaphragm 2 is formed inside the edge roll 1 supporting the diaphragm 2. One flange 1d also vibrates with the other flange 1a formed outside the edge roll 1 as a fulcrum.
[0007]
FIG. 6 is an enlarged view of the portion A in FIG. 5C. As is clear from FIG. 6, when the diaphragm 2 vibrates up and down, a tension in the P direction is generated in the edge roll 1, and the flange 1d inside the edge roll 1 is pulled inward. In such a case, since the other flange portion 1a formed outside the edge roll 1 is fixed to a frame (not shown), the gutter is deformed so that the height of the arc of the gutter 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 and each corner 1c of the rectangle are arcs having a uniform height, and as is clear from FIGS. 5 (b) and 5 (c), the edge roll 1 The distance to the inner flange 1d is longer at the corner 1c, and the above-mentioned tension acts greatly on the corner 1c. However, in the above-mentioned gutter, each side 1b of the rectangle and the corner 1c of each side have a uniform height. Therefore, as shown in FIG. The corner portion 1c acts stronger on the reaction force acting on the mold portion than on each side 1b. Therefore, the corner portion 1c acts to pull the diaphragm 2 back to the edge roll 1 more strongly than each side 1b.
[0009]
[Problems to be solved by the invention]
As described above, it is the structure of the edge roll 1 having a gutter-shaped cross section that largely affects the amplitude of the vibration system in the conventional speaker. That is, since the edge roll 1 has a rectangular side 1b and a corner 1c of each side in an arc shape with a uniform height, the tension of the diaphragm at the corner 1c is strong, and the amplitude of the entire diaphragm is limited. . As a result, since it is not possible to secure a large amplitude of the vibration system, there is a problem that it is difficult to design a large volume input and a high linearity in design.
[0010]
The present invention solves the above problem and can secure a large amplitude of a vibration system such as a diaphragm, and has excellent linearity in frequency characteristics and a suspension structure for electro-acoustic conversion with high input resistance. It is intended to provide an electroacoustic transducer.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a suspension structure for electro-acoustic conversion according to claim 1, which supports a rectangular diaphragm and forms a buffer portion that facilitates vibration of the diaphragm. includes an edge roll, each side of the edge roll forms a trough cross-sectional shape, respectively, the flange portion of one supporting the diaphragm is formed inside the trough, the edge roll is fixed to the frame The other flange is formed outside the gutter, and the lengths of the chords of the edge rolls on each side are equal at the opposing sides, and different at the adjacent sides. in use the suspension structure before Kiyuru衝部, the edge roll sides and chord formed in each corner portion is a downward arc-shaped portion, the height of the arc at the sides It is formed so as to increase toward the corner direction from the center of each side, the height of the arc at the corner portion, characterized in that the not highest at the corners of each side.
[0012]
Delete
The suspension structure for electroacoustic conversion according to claim 2, wherein the diaphragm is formed in a rectangular shape, a cylindrical voice coil is mounted at the center of the diaphragm, and the diaphragm is supported . It has a rectangular edge roll forming a buffer for facilitating vibration, a frame holding the edge roll, and a magnetic circuit acting on the voice coil, and the cross-sectional shape of the edge roll has a gutter shape on each side. it greens the and the length of the chord of the edge roll at each side is equal respectively in the sides respectively opposed to a different electroacoustic transducer respectively in the sides in a position adjacent the previous Kiyuru opposition parts, the chord on each side and the corners of the edge roll is formed in a downward arc-shaped, the height of the arc at the each side, toward the corner direction from the center of each side Is formed so as to pressure, the height of the arc at the corner portion, the with the highest moulder at the corners of each side, one flange portion for supporting the diaphragm is formed on the inner side of the edge roll, the other flange edge roll is fixed to the frame is formed outside the edge roll, characterized in that the chord side circular arc of the edge roll are disposed to face the frame.
[0014]
Delete [0015]
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 those in FIG. FIG. 1 is a side sectional view of an embodiment of an electroacoustic transducer according to the present invention. A magnetic circuit is formed by sandwiching a cylindrical magnet 8 between a circular upper plate 9 and a cylindrical lower plate 4. The frame 3 is joined 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 made of, for example, a magnetic material such as iron, and the frame 3 is made of, for example, a resin or a metal material.
[0016]
Further, a diaphragm 2 supported by an edge roll 1 is provided above the frame 3. A bobbin 7 around which a voice coil 5 for driving the diaphragm 2 is wound is in close contact with a lower portion (convex portion side) of the diaphragm 2. The intermediate portion is held at the center by a spring-shaped damper 6. The voice coil 5 and the bobbin 7 are integrally formed so as to vibrate together with the diaphragm 2 around the magnet 8 and the upper plate 9. The edge roll 1 is made of, for example, a material such as urethane, rubber, or cloth, the diaphragm 2 is made of, for example, paper, metal, cloth, synthetic resin, and the bobbin 7 is made of, for example, paper, cloth, synthetic resin, or the like.
[0017]
The edge roll 1 and the diaphragm 2 supported by the edge roll 1 are rectangular (rectangular). The edge roll 1 has good adhesion to the frame 3 and the edge roll 1, for example, the frame 3 is made of a rubber-based adhesive or the like. Fixed to. 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 into and integrated with a through hole (not shown) formed in a lower portion of the frame 3.
[0018]
FIG. 2 is a diagram of the rectangular diaphragm 2 and the rectangular edge roll 1 supporting the same, wherein FIG. 2A is a diagram viewed from above, and FIG. 2B is a diagram of FIG. 2A is a partial sectional view in the AA direction, FIG. 2C is a partial sectional view in the AA direction in FIG. 2A, and FIG. 2D is a partial sectional view in the BB direction in FIG. FIG. 3 is an enlarged view of a portion A in FIG.
[0019]
In FIG. 2, the points different from FIG. 5 are 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 of the arc of the edge roll 1 on the center line CC, and is a value at the position where the height of the arc becomes maximum. The chord length of the arc is a value of a linear distance Wn (n is an integer) at both ends of the gutter shape to both flange portions formed at both ends of the gutter shape of the edge roll 1. The rectangular edge roll 1 has a gutter-shaped cross section, and the height H2 of the arc of the corner 1c of the gutter-type edge roll 1 is formed higher than the height H1 of the arc on each of the sides 1b. I have. Further, the height of the arc increases in the direction of the corner 1c from the middle of each side 1b, and the height H2 of the arc at the corner 1c is formed higher than the height H1 of the arc at each side 1b. That is.
[0020]
As described above, the shape of the corner 1c of the edge roll 1 is different from the conventional example. Hereinafter, the shape of the corner 1c will be described with reference to FIGS. The edge roll 1 has a rectangular shape, and a portion 1b corresponding to each side of the edge roll 1 is an arc having a constant height H1. Then, the height of the arc gradually increases from the middle a of each side 1b, and reaches the maximum at the center b of the corner 1c. Such a shape is the same on all sides 1b and corners 1c.
[0021]
That is, as shown in FIG. 2C, the height of the arc of the portion 1b corresponding to each side is low, and the arc length is also short. Further, as shown in FIG. 2D, the height of the arc of the corner 1c is high, and the length of the arc is longer than the arc of the portion 1b corresponding to each side. This is the same as FIG. However, as is clear from the enlarged view of the portion A in FIG. 2D shown in FIG. 3, the height H2 of the arc at the corner 1c of each side 1b is greater than the height H1 of the arc at the side 1b. It is formed high.
[0022]
FIG. 4 is a view for explaining the shape of the corner 1c of the edge roll 1. FIG. 4 (a) is an enlarged view of the corner 1c of the edge roll 1, and FIGS. 4 (b) and 4 (c). 4 (d) and 4 (e) are views showing the shape of the arc at the corner 1c. In FIG. 4A, positions where the height of the arc of the portion 1b corresponding to each side of the edge roll 1 starts to change are taken on lines Q1-R1 and Q5-R5 shown in FIG. A point where a straight line drawn from the intersection point P1 at an angle of 45 degrees with respect to the line Q1-R1 intersects the outer flange 1a of the edge roll 1 is R4, and a point which intersects the inner flange 1d is Q4.
[0023]
A point where a straight line drawn from the intersection P1 at an angle θ with respect to the Q1-R1 line intersects with the outer flange 1a of the edge roll 1 is Rn (n is an integer), and the point of intersection with the inner flange 1d is Qn ( n is an integer). The point at which each of the straight lines intersects the center line CC of the arc is defined as Cn (n is an integer).
[0024]
The height of the arc is determined so as to increase as follows from the Q1-R1 line and the Q5-R5 line to the R4-Q4 line. For example, in FIG. 4B, when the height of the arc in the line Q1-R1 is “1” and the length of the chord is “3.5”, the angle θ from the intersection P1 to the line Q1-R1 is FIGS. 4 (c), 4 (d), and 4 (e) show the height of the arc and the length of the chord as viewed from the intersection P1 at 10, 30, and 45 degrees, respectively.
[0025]
As can be seen from FIGS. 4A and 4B, the height of the arc and the length of the chord increase as the angle θ increases, and reach a maximum when θ = 45 degrees. Similarly, it decreases as the angle θ increases from 45 degrees, and when θ = 90 degrees, it becomes the same as the arc height “1” and the chord length “3.5” in the Q5-R5 line. In FIG. 4, some corners of the edge roll 1 have been described, but the same applies to all corners, and a description thereof will be omitted.
[0026]
In FIG. 4, W1 = W2 has been described, but other values may be used. That is, the lengths W1, W2, W3, and W4 of the chords of the edge roll 1 on each side are determined according to the size, material, or shape (for example, a rectangle) of the edge roll 1, the material of the diaphragm 2, the volume of the speaker, and the like. The chord lengths W1 and W3 and W2 and W4 of the edge roll 1 on the sides at the opposing positions are equal to each other, and the chord lengths W1 and W2 of the edge roll 1 on the sides at the adjacent positions. W3 and W4 may be different from each other.
[0027]
Further, according to the size, 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 height of the arc increasing from the middle of each side 1 b toward the corner 1 c is: You may make it increase from the center of each side.
[0028]
The operation of the electroacoustic transducer shown in FIG. 1 will be described. The other flange 1a of the edge roll 1 is fixed to a frame 3 that holds the rectangular edge roll 1. An electric current is passed through the voice coil 5, and the voice coil 5 is wound by the electric current and a magnetic circuit formed by sandwiching the cylindrical magnet 8 between a circular upper plate 9 and a cylindrical lower plate 4. The bobbin 7 is vibrated 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 vibrated up and down by the vertical movement of the bobbin 7.
[0029]
When the vibrating plate 2 is vibrated, one flange 1d formed inside the edge roll 1 supporting the vibrating plate 2 also becomes the other flange 1a formed outside the edge roll 1. It is vibrated about the fulcrum.
[0030]
As shown in FIGS. 2 (c) and 2 (d), when the diaphragm 2 is vibrated up and down, a tension in the P direction is generated in the edge roll 1, and a flange portion inside the edge roll 1 is formed. 1d is drawn inward. In such a case, since the other flange portion 1a formed outside the edge roll 1 is fixed to the frame 3, it is deformed so that the height of the arc becomes lower. 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, and FIG. 4B, FIG. 4C, and FIG. 4), the arc height and chord length increase as the angle θ increases. That is, the distance to the inner flange 1d of the edge roll 1 is the longest when θ = 45 degrees, and the corners receive the strongest tension. On the other hand, each of the portions has the highest arc height and the longest chord length. Therefore, even at the corner portion where θ = 45 degrees, even if it receives the strongest tension, the string has the most spare power to stretch.
[0032]
When the angle θ is less than or equal to 45 degrees, the height of the arc and the length of the chord decrease, but the tension also decreases. Therefore, the reaction force of the edge roll 1 against the diaphragm 2 is made uniform around the diaphragm 2. By such an operation, the diaphragm 2 is not restricted by the amplitude of the entire diaphragm 2 at the corner of the edge roll 1.
[0033]
【The invention's effect】
According to the suspension structure for electro-acoustic conversion according to the first and second aspects, it is possible to ensure a large amplitude of the rectangular diaphragm, thereby achieving excellent linearity in frequency characteristics and high input resistance. The intended suspension structure for electroacoustic conversion can be realized.
[0034]
In addition, a small and thin speaker having excellent linearity in frequency characteristics and a speaker with high input resistance can be realized.
[Brief description of the drawings]
FIG. 1 is a side sectional view of an embodiment of an electroacoustic transducer according to the present invention.
FIGS. 2A and 2B are views of a rectangular diaphragm and a rectangular edge roll supporting the same, wherein FIG. 2A is a view from above, and FIG. 2B is a view in the AA direction of FIG. 2A; 2C is a cross-sectional view in the AA direction of FIG. 2A, and FIG. 2D is a partial cross-sectional view in the BB direction of FIG. 2A.
FIG. 3 is an enlarged view of a portion A in FIG. 2 (d).
FIG. 4 is a diagram illustrating the shape of a corner in an edge roll.
5A and 5B are diagrams of a conventional edge roll and a diaphragm of a speaker using an edge roll, and FIG. 5A is a diagram of a rectangular diaphragm and a rectangular edge roll supporting the same seen from above. 5B is a cross-sectional view in the AA direction of FIG. 5A, and FIG. 5C is a partial cross-sectional view in the BB direction of FIG.
FIG. 6 is an enlarged view of a part A of FIG. 5 (c).
[Explanation of symbols]
Reference Signs List 1 edge roll 2 diaphragm 3 frame 4 lower plate 5 voice coil 6 damper 7 bobbin 8 magnet 9 upper plate

Claims (2)

To support the rectangular diaphragm, provided with a rectangular edge rolls forming a buffer portion for facilitating vibration of said diaphragm, each side of the edge roll forms a respective cross section trough, the diaphragm Is formed on the inside of the gutter, the other flange on which the edge roll is fixed to the frame is formed on the outside of the gutter, and the length of the chord of the edge roll on each side is In the suspension structure for electroacoustic conversion , the sides at the opposing positions are equal, and the sides at the adjacent positions are different from each other .
Before Kiyuru衝部, the formed edge roll each side and each corner string consists downward arcuate portion, the height of the arc at the each side, toward the corner direction from the center of each side is formed so as to increase Te,
The height of the arc at the corner portion, the electroacoustic transducer for suspension structure, wherein the not highest at the corners of each side. A rectangular vibrating plate, a cylindrical voice coil attached to the center of the vibrating plate, and a rectangular edge roll for supporting the vibrating plate and forming a buffer for facilitating vibration of the vibrating plate When,
Comprising a frame for holding the edge roll, the magnetic circuit acts on the voice coil, the cross-sectional shape of the edge rolls, to name a trough on each side, and the length of the chord of the edge roll at the sides The electroacoustic transducers are equal on opposite sides, respectively, and are different on adjacent sides .
Before Kiyuru衝部intersects the chord is formed in a downward arc-shaped on each side and the corners of the edge roll,
The height of the arc at the sides is formed so as to increase from the center of each side toward the corner direction, the height of the arc at the corner portion, the with the highest moulder at the corners of each side,
The flange portion of one supporting the diaphragm is formed on the inner side of the edge roll, the edge roll other flange to be fixed to the frame are formed on the outer side of the edge roll, the arcs of the edge roll An electroacoustic transducer, wherein a string side is disposed to face the frame.

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