KR102028854B1 - Diaphragm - Google Patents

Abstract

The present invention relates to a diaphragm. According to an embodiment of the present invention, the diaphragm comprises: a diaphragm portion including a central portion protruding with a predetermined curvature and a surround portion disposed to surround the central portion; and a reinforcing portion protruding in the protruding direction of the central portion and having an upper portion coupled to one surface of the central portion. The reinforcing portion includes: a support surface supporting the reinforcing portion; and a plurality of protrusions formed by bending the support surface and protruding in the direction in which the central portion protrudes from the support surface. The reinforcing portion is coupled to the central portion so that the shape of the central portion having the predetermined curvature does not change, and a voice coil portion is coupled to the reinforcing portion. According to the present invention, the reinforcing portion is formed over the central portion and the surround portion of the diaphragm portion, thereby maximizing the rigidity and elasticity of the diaphragm even when the diaphragm is manufactured by using a thin synthetic resin film.

Description

Diaphragm {DIAPHRAGM}

The present invention relates to a diaphragm, and more particularly, to a diaphragm capable of minimizing frequency distortion by increasing the rigidity of the diaphragm.

In general, a speaker or earphone is a force coil when a current-carrying conductor is placed in a magnetic field, and according to Fleming's left-hand law, a voice coil exists between voids to convert electromagnetic energy into mechanical vibration energy. It is made by principle.

A dynamic driver (or unit) is a principle in which electrical energy is converted into mechanical vibration by Fleming's left-hand law, which is applied when a current is applied to an electrical circuit (eg, a voice coil) disposed in a constant magnetic field. Use

When an electrical signal including a peak pressure of an acoustic signal including several frequencies is applied to the voice coil, the voice coil generates mechanical vibration energy according to the strength of the current and the magnitude of the frequency. The vibration is transmitted to the diaphragm attached to the voice coil so that a sound pressure that the ear can recognize is generated in the diaphragm.

Therefore, in the magnetic circuit of the speaker, the voice coil is generally disposed at a position spaced apart from the outer periphery of the permanent magnet by using the permanent magnet. The voice coil is wound a predetermined number of times. When an electric signal including a sound signal peak pressure of a predetermined frequency band is applied to the voice coil, the voice coil is vibrated in a direction perpendicular to the winding direction.

At this time, in the case of earphones, the diaphragm is usually manufactured using a synthetic resin film. The diaphragm of such a synthetic resin film has a limitation in reproducing the bass, and uses a synthetic resin film and makes it thin in order to improve the quality of the bass reproduction.

However, the thinner the material, the physical stiffness and elasticity are bound to have a threshold that collapses the structure of the diaphragm. That is, when the vibration proceeds, physical division vibration or distortion occurs in the diaphragm. As a result, unintended harmonics are formed and phase shifts are generated for each part, which results in an increase in total housing distortion (THD) and peaks and dips in specific frequency bands, thereby degrading acoustic characteristics. Because it is.

To reinforce this, metal coating, impregnation, multiple lamination of different materials, partial metal application, and partial pulp application are applied to the diaphragm, but this causes the deterioration of acoustic performance due to the increase of mass of the vibrometer and the manufacturing cost. There is a problem with ascension.

United States Patent Application Publication No. 9,332,352 (2016.03.03)

The problem to be solved by the present invention is to provide a diaphragm having a certain stiffness and elasticity even when using a thin synthetic resin film.

The diaphragm according to an embodiment of the present invention includes a diaphragm portion including a central portion protruding with a predetermined curvature and a surround portion disposed to surround the central portion; And a reinforcing part protruding in a protruding direction of the central part and having an upper portion coupled to one surface of the central part, wherein the reinforcing part supports a reinforcing part; And the support surface is formed to be bent, and includes a plurality of protrusions protruding in the direction in which the center portion protrudes from the support surface, wherein the reinforcement portion is coupled to the central portion such that the shape of the central portion having the predetermined curvature does not change. The voice coil unit may be coupled to the reinforcement unit.

According to the present invention, by forming the reinforcing portion over the center portion and the surround portion of the diaphragm portion, even if the diaphragm is manufactured using a thin synthetic resin film, there is an effect that can maximize the rigidity and elasticity of the diaphragm.

The reinforcement can also reinforce the weak stiffness of the diaphragm center to the maximum with minimal increase in mass due to the plurality of protrusions and support surfaces spaced apart from the central part.

In addition, since the predetermined air is additionally included in the sealed space between the central portion and the reinforcement portion, the rigidity of the diaphragm may be compensated for.

Moreover, although the voice coil was attached to the center part of the diaphragm conventionally and the direct force was transmitted, according to this invention, a voice coil can be combined with a reinforcement part or a center part. Accordingly, it is possible to adjust the inner diameter of the voice coil and the size of the magnetic circuit, thereby controlling the performance including the dynamic driver output and sensitivity.

1 is a perspective view showing the upper surface of the diaphragm according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the reinforcing part separated from the drawing of FIG. 1 to explain the coupling relationship between the diaphragm part and the reinforcing part according to an exemplary embodiment of the present invention.
3 is a perspective view showing the bottom surface of the diaphragm according to an embodiment of the present invention.
4 is an exploded perspective view of the reinforcing part separated from the drawing of FIG. 3 to explain the reinforcing part of the diaphragm according to the exemplary embodiment of the present invention.
5 is a view showing a cross section of the diaphragm according to an embodiment of the present invention.
6 is a view illustrating a voice coil unit coupled to a diaphragm according to an embodiment of the present invention.
7 is an exploded perspective view of the voice coil unit separated from the diagram of FIG. 7 to describe the voice coil unit coupled to the diaphragm according to the exemplary embodiment of the present invention.
FIG. 8 is a diagram illustrating region A of FIG. 6.
9 is a view for explaining various examples for explaining the coupling relationship of the diaphragm according to an embodiment of the present invention.

Preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a perspective view showing the upper surface of the diaphragm according to an embodiment of the present invention, Figure 2 is a reinforcement in the Figure of Figure 1 to explain the coupling relationship between the diaphragm portion and the reinforcement portion according to an embodiment of the present invention The exploded perspective view which separated the part. And Figure 3 is a perspective view showing the lower surface of the diaphragm according to an embodiment of the present invention, Figure 4 is separated from the reinforcement in the Figure of Figure 3 to explain the reinforcement of the diaphragm according to an embodiment of the present invention Exploded perspective view.

3 and 4 illustrate a state in which the diaphragm 100 illustrated in FIGS. 1 and 2 is rotated 180 degrees in the vertical direction. Accordingly, the upper surface described with reference to FIGS. 1 and 2 can be described as the lower surface when the FIGS. 3 and 4 are described.

The diaphragm 110 is provided to reproduce sound. The diaphragm 110 is installed in a frame included in a speaker or earphone, and as shown, a surround part disposed around the central part 112 to surround the central part 112 and the central part 112 disposed at the center ( 114).

At this time, between the central portion 112 and the surround portion 114 includes a connecting portion 116 connecting the central portion 112 and the surround portion 114, the surround portion 114 for mounting the diaphragm 100 in a frame or the like. It may further include a mounting portion 118 disposed to surround.

As shown in FIG. 1, the central portion 112 may have a shape of a dome that protrudes to have a predetermined curvature. For example, the upper portion of the sphere may have a cut shape. In the present embodiment, a description will be given of the center portion 112 is formed in the shape of a dome, the center portion 112 may be formed in the shape of a cone, if necessary, in addition to other shapes may be formed.

The surround portion 114 is disposed to surround the central portion 112 and may have a shape of a dome protruding to have a predetermined curvature. For example, the upper portion of the donut shape may have a cut shape. Can be. At this time, in the present embodiment, it will be described that the surround portion 114 has a dome shape of a predetermined shape, but various bends or patterns may be formed in the auxiliary dome as necessary.

The center part 112 and the surround part 114 may be made of the same material, and if necessary, the material of the surround part 114 may be made of a different material from that of the center part 112. The central portion 112 and the surround portion 114 may each be made of a synthetic resin film, and, if necessary, may be made of pulp such as paper, impregnated fiber, multiple laminated (layered) film, bio cellulose, graphite, or the like. have.

The height of the central portion 112 and the surround portion 114 protruding upward may be the same, but the height of the central portion 112 and the surround portion 114 may be different from each other.

In the present embodiment, the reinforcement part 120 is coupled to the lower portion of the diaphragm portion 110, and specifically to the lower portion of the central portion 112. In the present embodiment, only the reinforcement portion is described below coupled to the bottom of the diaphragm portion, but the reinforcement portion may be coupled to the upper portion of the diaphragm portion as necessary.

The reinforcement part 120 may have a shape in which a part of a sphere is cut, such as the shape of the center part 112, and the support surface 122, the binding surface 124, the central protrusion 126, and the auxiliary protrusion 128 may be formed. It may include. In the present embodiment, the reinforcement portion 120 may be made of the same material as the diaphragm portion 110, a thin synthetic resin film, pulp, such as paper, impregnated fibers, multi-layer (layered) film, bio cellulose as necessary And graphite or the like.

The support surface 122 includes first to third support surfaces 122a, 122b, and 122c. Referring to FIG. 2, the first support part 122a may have a curvature similar to that of the center part 112 and may be formed in a shape in which a portion of the sphere is cut. In the present embodiment, the first support surface 122a is formed to have a curvature in the same direction as the center portion 112. And the support surface 122 may be made of a thin synthetic resin film.

The second support surface 122b is disposed outside to surround the first support surface 122a and extends from the first support surface 122a. In this case, the second support surface 122b may be formed in a plane parallel to the horizontal plane, and may be formed in a predetermined width. Accordingly, the first support surface 122a may be formed in the shape of a dome protruding upward from the second support surface 122b.

The third support surface 122c is disposed outside to surround the second support surface 122b and extends from the second support surface 122b. In this case, the third support surface 122c may be formed in a shape inclined upwardly outward from the second support surface 122b and may have a predetermined width. In addition, the third support surface 122c may have a cross-sectional shape in a curved shape, but is not limited thereto and may be formed in a straight line.

That is, the cross-sectional shape of the first support surface 122a and the third support surface 122c with respect to the second support surface 122b may be formed in a straight line or a curve inclined upward.

Referring back to FIG. 2, the central protrusion 126 and the auxiliary protrusion 128 are each integrally formed on the support surface 122. As will be described in detail later, the central protrusion 126 and the secondary protrusion 128 are formed in a continuous surface on the support surface 122.

The central protrusion 126 may be disposed in the center of the first support surface 122a of the reinforcement part 120, and may be formed to protrude from the first support surface 122a in a shape such as a circular column. have. In this case, the central protrusion 126 may have a shape protruding in the same direction as the direction in which the first support surface 122a protrudes.

Of course, in the present embodiment, the shape of the central protrusion 126 is described as having a circular columnar shape, but may be formed in various shapes as necessary.

For example, in the present embodiment, since the planar shape of the diaphragm 110 is described as being circular, the planar shape of the central protrusion 126 is formed to correspond to the circular shape. Accordingly, when the shape of the diaphragm 110 is formed in a square shape or the like, the shape of the central protrusion 126 may also vary accordingly.

The auxiliary protrusion 128 is disposed around the central protrusion 126, and as shown in the drawing, a plurality of auxiliary protrusions 128 may be formed on the first support surface 122a. The outer auxiliary protrusion 129 disposed on the outermost side of the plurality of auxiliary protrusions 128 may be formed over the first to third support surfaces 122a, 122b, and 122c, as shown. Accordingly, the remaining auxiliary protrusions 128 except for the outer auxiliary protrusion 129 may be disposed on the first support surface 112a.

The shape of the auxiliary protrusion 128 may have a shape of an approximately polygonal column, and for example, may be formed in the shape of a hexagonal pillar. At this time, the shape of the auxiliary protrusion 128 may be formed so that the side is a round shape, even if formed in the shape of a polygonal pillar. The auxiliary protrusion 128 may have a shape protruding in the direction in which the first support surface 122a protrudes, like the central protrusion 126.

In addition, the plurality of auxiliary protrusions 128 may be disposed around the central protrusion 126 to surround the central protrusion 126, and may be spaced apart from the central protrusion 126 by a predetermined distance. In addition, the plurality of auxiliary protrusions 128 may be spaced apart from each other by a predetermined distance.

In addition, the outer auxiliary protrusion 129 adjacent to the binding surface 124 of the plurality of auxiliary protrusions 128 may have a curved shape in which the bottom surface of the polygonal shape extends to the binding surface 124.

The plurality of auxiliary protrusions 128 are arranged in a shape surrounding the center around the central protrusion 126 disposed in the center of the reinforcement part 120, and the size becomes larger as the distance from the central protrusion 126 is disposed. Can be. That is, the size of the auxiliary protrusion 128 disposed close to the central protrusion 126 may be smaller than the size of the auxiliary protrusion 128 disposed far from the central protrusion 126. Accordingly, more auxiliary protrusions 128 may be disposed in the reinforcement part 120.

The height of the central protrusion 126 and the auxiliary protrusion 128 may be relatively smaller than the width of the central protrusion 126 or the auxiliary protrusion 128 in plan view. Accordingly, even if the distance between the central protrusion 126 or the auxiliary protrusion 128 is narrowed due to the vibration of the central portion 112, interference such as hitting between the central protrusion 126 and the plurality of auxiliary protrusions 128 does not occur. Can be.

In addition, the side surfaces forming the central protrusion 126 and the plurality of auxiliary protrusions 128 may be vertically formed in the horizontal plane, respectively. As shown, as the support surface 122 is formed to have a curved surface, such as the central portion 112, the sides of the central protrusion 126 and the sides of the plurality of auxiliary protrusions 128 are perpendicular to the support surface 122. It may not be formed so as to have a predetermined angle. Accordingly, the central protrusion 126 and the plurality of auxiliary protrusions 128 may maintain a constant distance from each other.

Of course, the present invention is not limited thereto, and the central protrusion 126 and the plurality of auxiliary protrusions 128 may protrude in a direction perpendicular to the support surface 122.

Referring to FIG. 2, the reinforcement part 120 may be separately manufactured and coupled to the diaphragm part 110. The upper surface of the reinforcement portion 120 may be coupled to the lower surface of the central portion 112. At this time, if necessary, the reinforcement part 120 and the center part 112 may be bonded through an adhesive or the like, or may be bonded through thermal bonding as necessary.

In the present embodiment, when the reinforcement portion 120 is coupled to the central portion 112, the centers which are respectively the upper surfaces of the central protrusion 126 and the auxiliary protrusion 128 protruding from the support surface 122 of the reinforcement portion 120. The protrusion coupling surface 126a and the auxiliary protrusion coupling surface 128a may be brought into contact with the bottom surface of the central portion 112. In addition, a binding surface 124 disposed to surround the support surface 122 may be coupled to the connection portion 116.

Accordingly, when the diaphragm 110 vibrates by a current applied by the voice coil, the shape of the central portion 112 may be prevented by the reinforcement 120 due to an external force. That is, as described above, the central protrusion 126 and the auxiliary protrusion 128 are formed so as to protrude in the direction in which the first support surface 122a protrudes, respectively, in the direction in which the first support surface 122a protrudes. It is possible to prevent the shape from being deformed in the opposite direction.

In this case, the central protrusion 126 and the plurality of auxiliary protrusions 128 formed on the reinforcement part 120 may be integrally formed with the support surface 122, as shown, and the central protrusion 126 and the plurality of auxiliary protrusions. The protrusion 128 protrudes in the upper direction of the support surface 122 by pressing a portion of the support surface 122 (in this case, the upper direction of the support surface 122 means the direction in which the support surface 122 protrudes.) Can be formed. Accordingly, the reinforcement part 120 may be formed of one sheet of synthetic resin film, and the center protrusion 126 and the plurality of auxiliary protrusions 128 may have grooves H formed on the rear surface of the protruding direction, respectively.

3 and 4, the central protrusion 126 and the auxiliary protrusion 128 are formed extending from the support surface 122, so that the central protrusion located far from the support surface 122 when the central portion 112 is vibrated. The spaced apart distances of the bottom of the 126 and the sub-projection 128 can be widened.

As shown in FIGS. 3 and 4, as the grooves H are formed in the central protrusion 126 and the plurality of auxiliary protrusions 128, respectively, the reinforcement part 120 is relatively larger than the diaphragm part 110. It may have a light weight, and when the central portion 112 is vibrated, the influence of the weight of the reinforcement portion 120 may be minimized.

5 is a view showing a cross section of the diaphragm according to an embodiment of the present invention.

5 is a cross-sectional view of the diaphragm 100 by cutting the diaphragm 100 shown in FIG. 1 in a vertical direction.

As shown, the reinforcement portion 120 is coupled to the central portion 112. In addition, a groove H may be formed at a lower portion of the central protrusion 126 and the auxiliary protrusion 128 included in the reinforcement part 120. In this case, when the reinforcement part 120 is coupled to the central part 112, a gap between the reinforcement part 120 and the center part 112 is provided as the central protrusion part 126 and the plurality of auxiliary protrusion parts 128 are spaced apart from each other. (G) is formed.

As described above, the gap G formed as described above, when the reinforcing portion 120 is coupled to the central portion 112, the upper surface of the central projection engaging surface 126a and the auxiliary projection 128, which is the upper surface of the central projection 126. As the auxiliary auxiliary protrusion engaging surface 128a is brought into contact with the bottom surface of the central part 112, and the binding surface 124 is brought into surface contact with the connecting part 116, the reinforcing part 120 and the central part 112 are separated. It is formed by forming an enclosed space with the outside. Since a predetermined air is included in the gap G thus formed, the rigidity of the diaphragm 110 may be more maximized by the air included in the gap G.

6 is a view illustrating a voice coil unit coupled to a diaphragm according to an embodiment of the present invention, and FIG. 7 illustrates a voice coil unit coupled to a diaphragm according to an embodiment of the present invention. It is an exploded perspective view which isolate | separated the voice coil part from a figure. 8 is a diagram illustrating region A of FIG. 6.

The voice coil unit 130 may be coupled to the diaphragm 100 according to the present embodiment. In this embodiment, the voice coil unit 130 will be described to include bobbins 132 and coils 134. The bobbin 132 may be omitted as necessary.

As shown, the bobbin 132 may be formed in the shape of a tube having a circular cross section, and the coil 134 is disposed in a state wound around the outer circumferential surface of the bobbin 132.

The voice coil part 130 is coupled to the reinforcement part 120 in this embodiment. As described above, the support surface 122 of the reinforcement part 120 includes first to third support surfaces 122a, 122b, and 122c, and the second support surface will be described with reference to FIGS. 6 and 7. 122b protrudes upward, and the first and third support surfaces 122a and 122c are formed in a downward direction from the second support surface 122b. The second support surface 122b may be formed as a flat surface such as a horizontal plane. Accordingly, the bobbin 132 of the voice coil unit 130 is coupled to the second support surface 122b.

As shown in FIG. 6, when the voice coil unit 130 is coupled to the reinforcement unit 120, as shown in FIG. 6, the inside and the outside of the voice coil unit 130 may be spaced by the voice coil unit 130. Are separated. Accordingly, when the diaphragm 100 is moved by the current applied to the voice coil unit 130, it may not be easy for air inside the voice coil unit 130 to be properly discharged to the outside. Air may be discharged between the voice coil part 130 and the reinforcement part 120 by the groove H formed while the 129 is formed.

That is, referring to FIG. 8, even when the voice coil unit 130 is coupled to the second support surface 122b of the reinforcement unit 120, the voice is provided through the groove H disposed under the voice coil unit 130. Air inside the coil unit 130 may be discharged to the outside. Arrows shown in FIG. 8 indicate a path through which air is discharged.

Accordingly, when the diaphragm 100 is vibrated while the voice coil unit 130 is coupled to the reinforcement unit 120, heat generated from the voice coil unit 130 may be easily discharged to the outside together with air. have. In addition, the flow of air can be easily flowed, it is possible to smooth the vibration movement of the diaphragm 100 to improve the response speed of the diaphragm 100.

9 is a view for explaining various examples for explaining the coupling relationship of the diaphragm according to an embodiment of the present invention.

9, examples of the coupling relationship between the central portion 112, the surround portion 114, and the reinforcement portion 120 of the diaphragm 100 according to the present embodiment will be described.

9 (a) is a view showing that the diaphragm 110 and the reinforcement portion 120 of the diaphragm 100 according to the present embodiment is coupled, to illustrate that the diaphragm 110 and the reinforcement to be coupled The unit 120 is spaced apart from the drawing.

Referring to FIG. 9A, the connecting portion 116 of the diaphragm 110 and the binding surface 124 of the reinforcement 120 are coupled. At this time, the size of the connecting portion 116 and the binding surface 124 may be the same. Although the reference numeral is omitted, protrusions formed in the reinforcement part 120 are coupled to the diaphragm part 110.

And (b) of Figure 9 is a view showing that the binding surface 124 of the reinforcing portion 120 is larger than the connecting portion 116 of the diaphragm 110 in another embodiment. The binding surface 124 of the reinforcement part 120 may have a size that may be applied to the connection surface 116 of the diaphragm part 110 and a part of the surround part 114. Accordingly, the binding surface 124 of the reinforcement part 120 may be coupled over the connection part 116 and the surround part 114 of the diaphragm part 110.

In addition, Figure 9 (c) is a view for explaining a coupling relationship with the reinforcement portion 120 when the center portion 112 and the surround portion 114 of the diaphragm 110 is manufactured separately in another embodiment. to be.

The central portion 112 may have a connection portion 116 disposed outside, and the surround portion 114 may have a separate connection portion disposed inside thereof. Accordingly, the central portion 112, the surround portion 114, and the reinforcement portion 120 are disposed in the upper portion in the lower portion, and the connection portion 116 of the central portion 112 and the connection portion and reinforcement portion 120 of the surround portion 114 are arranged. The binding surface 124 of may be coupled in sequence.

For the present embodiment, the diaphragm 100 has been described. The diaphragm 100 may be applied to speakers, earphones, or headphones, and may be used regardless of the size of the diaphragm 100. In addition, the center part 112 and the surround part 114 included in the diaphragm 110 may be integrally formed, but may be manufactured separately and then coupled to each other as necessary.

1 and 2, the reinforcement part 120 has been described as being coupled to the lower part of the diaphragm part 110, but the reinforcement part 120 may be formed in the diaphragm part 110. It may be coupled to the top. In this case, the central protrusion 126 and the plurality of auxiliary protrusions 128 formed on the reinforcement part 120 are supported in a lower direction opposite to the direction in which the first support surface 122a of the reinforcement part 120 protrudes, respectively. Protruding from the surface 122 may be formed. In addition, the top surface of the central protrusion 126 and the plurality of auxiliary protrusions 128 may be coupled in surface contact with the upper surface of the central portion 112.

As described above, the detailed description of the present invention has been made by the embodiments with reference to the accompanying drawings. However, since the above-described embodiments have only been described by way of example, the present invention is limited to the above embodiments. It should not be understood, the scope of the present invention will be understood by the claims and equivalent concepts described below.

100: diaphragm
110: diaphragm portion
112: center portion 114: surround portion
116: connection portion 118: mounting portion
120: reinforcement
122: support surface 122a: first support surface
122b: second support surface 122c: third support surface
124: binding surface
126: center protrusion 126a: center protrusion engagement surface
128: secondary projection 128a: secondary projection engaging surface
129: outer auxiliary protrusion
130: voice coil unit 132: bobbin
134: coil
G: gap H: groove

Claims (1)

A diaphragm portion including a central portion protruding with a predetermined curvature; And
It includes a reinforcing portion coupled to one surface of the central portion,
The reinforcement part,
Support surface; And
A portion of the support surface is formed to be bent, and includes a plurality of protrusions protruding in the direction in which the central portion protrudes from the support surface,
The reinforcement portion is coupled to the central portion so that the shape of the central portion having the predetermined curvature does not change,
The voice coil unit is coupled to the reinforcement unit,
And a groove formed by one or more of the protruding portions between the voice coil portion and the reinforcement portion so that air passes through the inside and the outside of the voice coil portion.

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